KR20130024375A - Espresso coffee machine - Google Patents

Abstract

PURPOSE: An espresso coffee machine is provided to prevent taste of coffee from degrading when the coffee is extracted in the low temperature and to extract coffee with the same taste when continuously extracting the coffee. CONSTITUTION: An espresso coffee machine comprises a water supply part(20) which includes a filter holder; a porter filter(80), a boiler(30), a hot water supply device(40), a first hot water line(71), a heat exchanging device(50), a cool water line(60), and a second hot water line(72). The porter filter is connected to a main body and extracts the espresso coffee. The first hot water line is connected to the filter holder and the hot water supply device and supplies hot water from the hot water supply device to the porter filter. The heat exchanging device is connected to the hot water supply device and the water supply part, exchanges the cool water which is supplied in the inner part through the water supply part by the boiler, and supplies the hot water to the hot water supply device. The second hot water line is directly connected to the hot water supply device in the heat exchanging device and provides the hot water which is heated by heat-exchanging in the heat exchanging device to the hot water supply device.

Description

Espresso Coffee Machine {ESPRESSO COFFEE MACHINE}

The present invention relates to an espresso coffee machine, and more particularly to an espresso coffee machine capable of extracting coffee having the same taste and aroma during continuous extraction of coffee.

Coffee drinks made using coffee beans are largely divided into instant coffee and coffee beans. The coffee beans are divided into drip coffee and espresso according to the extraction method from the coffee beans.

In particular, espresso refers to a method of extracting coffee in a short time by providing high pressure hot water to the ground coffee beans and coffee extracted through such a method.

In addition, the apparatus for extracting espresso coffee is composed of a filter (porta filter) for accommodating the ground coffee to extract the coffee beans and a boiler and pump for providing hot water to the coffee beans.

Existing espresso coffee machines are known in various forms according to the purpose or size of use, such as coffee shops, industrial and corporate, home use.

On the other hand, the factors that determine the flavor of the espresso coffee include the type of coffee beans, the degree of roasting the coffee beans, the size of the particles ground the coffee beans, and the like. However, in addition to the above-mentioned factors, the hot water temperature when extracting the espresso coffee from the espresso coffee machine is also an important factor.

For example, conventional espresso coffee machines extract espresso coffee in hot water at a temperature of about 90 ° C.

However, in the conventional espresso coffee machine, a temperature drop occurs during the continuous extraction of coffee, and thus the temperature of the continuously extracted coffee is extracted with a different temperature, and thus, the coffee taste and aroma decrease as the coffee is continuously extracted. there was.

In addition, coffee shops that mainly use espresso coffee machines sell various kinds of tea beverages in addition to coffee, and since espresso coffee machines cannot extract tea, in order to service various teas, tea extraction equipment is used in addition to espresso coffee machines. Tea is being extracted. Accordingly, the coffee shop has to have a tea extracting device in addition to the espresso coffee machine, there is a problem that the cost for equipment purchase increases.

Therefore, the problem to be solved by the present invention is to reduce the temperature and temperature of the hot water supplied during continuous extraction of coffee to prevent the taste and aroma of the coffee is continuously extracted, to provide an espresso coffee machine to extract tea as well as coffee It is.

Espresso coffee machine according to an embodiment of the present invention for solving the above problems is the main body having a filter holder; A water supply unit installed inside the main body to supply cold water from a water supply source; Porter filter coupled to the main body for extracting the espresso coffee; A boiler installed inside the body and holding hot water and steam; A hot water supply unit installed at an inner side of the boiler; A first hot water line connected to the filter holder and the hot water supply unit to supply hot water to the porter filter from the hot water supply unit; A heat exchanger installed at one side of the hot water supply in the boiler and connected to the hot water supply and the water supply to heat the cold water supplied into the water through the water supply by the boiler to supply hot water to the hot water supply. ; A cold water line connected to the heat exchanger from the water supply unit to supply cold water to the heat exchanger; And a second hot water line connected directly to the hot water supply in the heat exchanger so that hot water heated by heat exchange in the heat exchanger is always supplied to the hot water supply.

The heat exchanger includes a body having a cylindrical shape, a cold water jet pipe installed inside the body and connected to the cold water line to eject cold water supplied through the cold water line into the body, wherein the cold water jet pipe The outer surface of the nozzle may be formed so that the cold water evenly ejected to the body are arranged at equal intervals along the longitudinal direction.

The espresso coffee machine may be provided with a plurality of the heat exchanger and the hot water supply according to the number of the porter filter is mounted on the main body.

Espresso coffee machine according to another embodiment of the present invention for solving the above problems is a filter unit for receiving the coffee beans, the porter filter is ground and a mesh portion formed; A filter housing having an upper portion open to allow the filter portion to be mounted, and a coffee discharge hole for discharging the coffee extracted through the lower portion; A taking-out unit coupled to a lower portion of the filter housing so as to communicate with the coffee discharge port and discharging the extracted coffee; And a pressure holding member inserted into and coupled to the coffee outlet to maintain the pressure in the filter housing when the coffee is extracted, wherein the pressure holding member is configured to discharge the extracted coffee to the dispensing unit. A through hole for penetrating the holding member to communicate the filter housing with the take out unit may be formed.

The pressure holding member may include a body having a screw shape to be inserted into and fastened to the coffee outlet; And a head part protruding from the bottom surface of the filter housing when the body part is coupled to the coffee outlet.

According to the espresso coffee machine according to the present invention, since the hot water is supplied through a plurality of heating processes of the first preheat and the second preheat in the process of supplying the cold water to the porter filter, there is no temperature drop of the hot water for coffee extraction, Since hot water of constant temperature can be continuously supplied even in the continuous extraction process of coffee, it is possible to continuously extract coffee of a constant temperature, and even if the coffee is continuously extracted, coffee is extracted at a lower temperature than the first time. Since it is prevented from deteriorating, there is an effect of always being able to extract the coffee of the same taste even during continuous extraction.

In addition, since the pressure holding member is further provided in the pota filter, coffee having a stronger aroma and taste can be extracted, and tea can be extracted, and the pressure holding member is not simply mixed with water or tea powder or tea leaves. As the pressure in the filter housing is maintained, the natural powder and tea leaves are dissolved or soaked in the hot water while the hot water is completely filled in the filter housing and the filter part. There is an effect that can extract the tea having.

1 is a perspective view showing the appearance of an espresso coffee machine according to an embodiment of the present invention.
2 and 3 are schematic configuration diagrams showing the configuration of an espresso coffee machine according to an embodiment of the present invention.
4 is a cross-sectional view showing the configuration of a heat exchanger of an espresso coffee machine according to an embodiment of the present invention.
Figure 5 is an exploded perspective view showing the configuration of the porter filter of the espresso coffee machine according to an embodiment of the present invention.
Figure 6 is a cross-sectional view showing a state in which the porter filter of the espresso coffee machine according to an embodiment of the present invention mounted on the filter holder.
Figure 7 is a perspective view showing the configuration of the porter filter of the espresso coffee machine according to another embodiment of the present invention.
8 is a cross-sectional view showing a state in which the porter filter of the espresso coffee machine according to another embodiment of the present invention is mounted on the filter holder.

Specific details of other embodiments are included in the detailed description and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. It is provided to fully inform the scope of the invention, and the invention is defined only by the scope of the claims.

Hereinafter, an espresso coffee machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the appearance of an espresso coffee machine according to an embodiment of the present invention, Figures 2 and 3 is a schematic configuration showing the configuration of an espresso coffee machine according to an embodiment of the present invention, Figure 4 6 is a cross-sectional view showing the configuration of a heat exchanger of an espresso coffee machine according to an embodiment of the present invention. FIG. 5 is an exploded perspective view showing the configuration of a port filter of an espresso coffee machine according to an embodiment of the present invention. Porter filter of the espresso coffee machine according to an embodiment of the invention is a cross-sectional view showing a state mounted on the filter holder.

Espresso coffee machine according to an embodiment of the present invention, as shown in Figures 1 to 3 body 10, water supply unit 20, porter filter 80, boiler 30, hot water supply 40, the first hot water Line 71, heat exchanger 50, cold water line 60, the second hot water line 72 is included.

The main body 10 is provided with at least one filter holder 12 for mounting the porter filter 80, the lower portion of the filter holder 12 for receiving coffee to be taken out of the porter filter 80 A cradle 13 for supporting the container 14 is provided. Here, the holder 13 serves not only to support the seat on which the coffee container 14 is seated, but also to drain coffee outside the coffee container 14 or overflowing from the coffee container 14 during the coffee extraction process. It is formed to be discharged to). For example, the holder 13 may be provided with a net supporting the coffee container 14 and discharging the coffee to the drain provided at the bottom.

One side of the main body 10 is provided with an operation panel 11 provided with a plurality of buttons or a display panel so that a user can operate and control an espresso coffee machine.

The water supply unit 20 includes a water reservoir and a water supply pump 22 for supplying cold water from a water supply source to a heat exchanger 50 to be described later, wherein the water reservoir is a water purifier 21 connected to the water supply pump 22. It may be, or may be a water storage tank of a predetermined volume provided inside the body (10). The water feed pump 22 supplies water at a predetermined pressure from a water reservoir, that is, the water cooler 21 to the cold water line 60 to be described later.

Boiler 30 is installed in the main body 10 and is configured in the form of a cylindrical tank, the heater 31 is provided on one side, about two thirds are filled with hot water and the steam is filled with the upper portion of the hot water It is.

The hot water supply 40 is installed at one side of the boiler 30 to be connected to the porter filter 80, and the first hot water line 71 is connected to the hot water supply 40 and the filter holder 12 to provide hot water. The feeder 40 and the porter filter 80 are connected so that hot water supplied through the hot water supply 40 is supplied to the porter filter 80.

The heat exchanger 50 is installed at one side of the hot water supply 40 in the boiler 30 and is connected to the hot water supply 40 and the water supply 20 to receive the cold water supplied to the inside through the water supply 20. Heat exchange by the boiler 30 to supply hot water to the hot water supply (40).

The heat exchanger 50 is installed in the body 51 having a cylindrical shape as shown in FIG. 4, the inside of the body 51, and is connected to the cold water line 60 to be described later, and is supplied through the cold water line 60. It includes a cold water jet pipe 52 for spraying the inside of the body (51).

Here, the nozzle 53 for ejecting the cold water evenly to the body 51 is formed on the outer surface of the cold water jet pipe 52 so as to be arranged at equal intervals along the longitudinal direction.

The cold water line 60 is connected to the heat exchanger 50, that is, the cold water jet pipe 52, in the water supply unit 20 so that cold water is supplied into the heat exchanger 50.

The second hot water line 72 is directly connected to the hot water supply 40 in the heat exchanger 50 so that hot water heated by heat exchange in the heat exchanger 50 is always supplied to the hot water supply 40. And on the second hot water line 72 is provided with an on-off valve (V) for supplying or blocking hot water to the porter filter 80, the on-off valve (V) may be composed of a solenoid valve.

Meanwhile, the heat exchanger 50 may be connected to each side of the cold water line 60 and the second hot water line 72 opposite to each other of the heat exchanger 50, as shown in FIG. The line 60 and the second hot water line 72 may be simultaneously connected to one side of the heat exchanger 50.

The porter filter 80 is mounted to the filter holder 12, where the filter holder 12 has a groove shape into which the flanges 81d and 82b of the porter filter 80 are inserted and coupled as shown in FIG. In addition, the filter holder 12 is provided with a water supply nozzle 12b to which the first hot water line 71 is connected, and a plurality of elements for uniformly providing hot water provided by the water supply nozzle 46 to the porter filter 80. The screen 12a is formed with a hole.

The screen 12a seals the upper portion of the porter filter 80 and serves as a cover to prevent the ground coffee beans contained in the porter filter 80 from flowing back into the espresso coffee machine 1.

In order to extract the espresso coffee, a predetermined pressure is applied to the ground coffee beans C accommodated in the porter filter 80, and the espresso coffee is extracted by passing hot water H through the coffee beans C under pressure.

Here, in order to maintain the airtightness of the porter filter 80, a sealing member (not shown) may be interposed between the porter filter 80 and the filter holder 12, for example, the sealing member (not shown) is rubber It may be an O-ring formed of an elastic material such as.

The porter filter 80 includes a filter housing 81, a filter unit 82, a blowout unit 83, a pressure holding member 90, and a grip handle 84 as shown in FIG. 5.

The filter housing 81 is a container of a predetermined volume that can accommodate the coffee beans C. For example, the filter housing 81 has an approximate hemispherical shape or bowl shape of the predetermined volume.

In addition, the filter housing 81 is formed with a first flange 81d at which an upper part is opened and a filter part 82 is seated and is coupled to the filter holder 12.

And, the lower portion of the filter housing 81 is formed through the filter housing 81 is a coffee outlet (81a) for discharging the extracted coffee. For example, the coffee outlet 81a is formed through the center of the bottom surface 81b of the filter housing 81, and the bottom surface 81b is formed so that the extracted coffee can converge to the coffee outlet 81a. It is formed to be inclined downward toward 81a.

A grip handle 84 is provided on the outside of the filter housing 81 to move the filter housing 81 and to mount and detach the port filter 80 to the filter holder 12.

The filter portion 82 is coupled to the open upper portion of the filter housing 81 and coupled to the filter housing 81 so that the coffee beans C are directly received inside the filter portion 82. Here, the filter unit 82 has a rigidity of sufficient size to counteract the pressure applied to the coffee beans C during the coffee extraction process, and does not alter the flavor of the coffee because it is in direct contact with the coffee beans C. Is formed. For example, the filter part 82 and the filter housing 81 may be formed of stainless steel.

The filter portion 82 has a second flange 82b corresponding to the first flange 81d, and a mesh portion for extracting coffee by passing hot water H in a state where the coffee beans C are accommodated. 82a is formed. Here, the hole size of the mesh portion 82a is preferably such that the size of the ground coffee C does not pass through the mesh portion 82a.

The filter portion 82 has a shape that is approximately similar to the inner shape of the filter housing 81 to be tightly received by the filter housing 81. For example, the filter unit 82 has a volume capable of accommodating an amount of coffee beans C capable of extracting 1 to 2 cups of espresso coffee.

Here, the filter portion 82 is provided with a lower portion of the filter portion 82 spaced apart from the bottom surface 81b of the filter housing 81 so that coffee can be smoothly extracted to the coffee outlet (81a).

However, the present invention is not limited thereto, and the shape and size of the filter housing 81 and the filter part 82 may have various shapes and sizes substantially depending on the use, size, and capacity of the espresso coffee machine 1. There will be.

The ejection unit 83 is coupled to the outer bottom of the coffee outlet 81a. For example, a first engaging portion 81c extending from the coffee outlet 81a to the outside by communicating with the coffee outlet 81a is formed at the lower outer side of the filter housing 81, and the take-out unit 83 is the first unit. It is fastened to the coupling part 81c. The first coupling portion 81c has a male screw shape and has a male screw shape, and the extraction unit 83 has a second coupling portion 83a having a female screw shape to receive and engage the first coupling portion 81c.

The ejection unit 83 is provided with a ejection guide 83b communicating with the coffee outlet 81a and a ejection port 83c for discharging the extracted coffee to the lower coffee container 14. For example, the take-out unit 83 has a tube shape branched into a roughly '∩' shape so that two cups of coffee can be simultaneously extracted. In addition, the ejection guide 83b converges the coffee discharged from the coffee outlet 81a and guides the coffee downward. The ejection guide 83c is formed at each end of the tube branched downward.

Hereinafter will be described in detail with the focus on the process of extracting coffee to further highlight the features and advantages of the espresso coffee machine according to an embodiment of the present invention.

For coffee extraction, first, a coffee bean (C) of about 1-2 cups of espresso coffee can be extracted into the filter portion 82 of the porter filter 80, and then the porter filter 80 is placed in the main body 10. To the filter holder (12). At this time, the boiler 30 of the main body 10 is in a state of preheating and maintaining a hot state.

When coffee extraction is started by pressing the extraction button of the operation panel 11 of the main body 10, the water supply pump 22 first pumps the water of the water purifier 21 to supply cold water to the heat exchanger 50.

Cold water supplied to the heat exchanger 50 is substantially supplied to the cold water jet pipe 52 in the body 51 of the heat exchanger 50, the cold water in the cold water jet pipe 52 is passed through a plurality of nozzles (53) The body 51 is ejected evenly.

In the process of gradually filling the cold water inside the body 51 of the heat exchanger 50, the cold water inside the heat exchanger 50 is heated by hot water heated by the electric heater 31 inside the boiler 30 and heated steam. Hot water is generated by heat exchange in the process, and hot water is discharged to the second hot water line 72, and hot water preheated primarily from the heat exchanger 50 through the second hot water line 72 is supplied to the hot water supply 40. The hot water supplied to the hot water supply 40 is preheated by hot water and steam of the boiler 30 while filling the inside of the hot water supply 40, and then the main body 10 through the first hot water line 71. It is supplied to the porter filter 80 through the water supply nozzle 12b provided in the filter holder 12 of the.

Coffee is extracted while the coffee beans (C) are dissolved in hot water supplied to the porter filter 80, and the extracted coffee is converged to the lower dispensing unit 83 through the coffee outlet 81a, through the outlet 83c. It is discharged to the coffee container 14.

The present invention can extract the coffee having a constant temperature at all times without lowering the temperature of the extracted coffee when the continuous extraction by the above-described coffee extraction process.

That is, in the process of supplying hot water to extract coffee, cold water is first supplied to the heat exchanger 50 through the cold water line 60, and the cold water in the heat exchanger 50 is preheated first in the boiler 30. The hot water generated in the heat exchanger 50 is supplied to the hot water supply 40 through the second hot water line 72, and the hot water in the hot water supply 40 is preheated in the boiler 30 in a secondary manner. Hot water is supplied to the filter 80.

Therefore, in the process of heating the cold water to supply to the porter filter 80, the hot water is supplied through a plurality of heating processes of the first preheating and the second preheating, so there is no temperature drop of the hot water for coffee extraction and continuous extraction of the coffee. Since hot water at a constant temperature can be continuously supplied during the process, it is possible to continuously brew coffee at a constant temperature, and the coffee taste is prevented from being lowered by extracting the coffee at a lower temperature than the first time even if the coffee is continuously extracted. Even during continuous extraction, coffee of the same taste can always be extracted.

Hereinafter, an espresso coffee machine according to another embodiment of the present invention will be described in detail with reference to FIG. 7 and FIG. 8 based on differences from an espresso coffee machine according to an embodiment of the present invention. 7 is a perspective view showing the configuration of the porter filter of the espresso coffee machine according to another embodiment of the present invention, Figure 8 is a state showing the porter filter of the espresso coffee machine according to another embodiment of the present invention mounted on the filter holder It is a cross section.

Espresso coffee machine 2 according to another embodiment of the present invention is inserted and coupled to the coffee outlet 81a of the filter housing 81 as shown in Figs. 7 and 8, the pressure in the filter housing 81 when brewing coffee A pressure holding member (90) for maintaining the pressure holding member (90), wherein the body portion (91) has a screw shape to be inserted into and fastened to the coffee outlet (81a); And a head portion 92 formed to protrude from the bottom surface of the filter housing 81 when the body portion 91 is coupled to the coffee outlet 81a. One embodiment of the present invention except that the extraction hole (92a) is formed through the pressure holding member 90 to communicate with the filter housing 81 and the extraction unit 83 to be discharged to the 83). Same as the espresso coffee machine 1 according to the example.

In more detail with respect to the pressure holding member 90, the pressure holding member 90 is coupled to the coffee outlet (81a) serves to maintain the pressure applied to the filter housing 81 during the coffee extraction. That is, the pressure holding member 90 is inserted and coupled to the coffee outlet 81a to reduce the conduit to a predetermined size or less to maintain the pressure in the filter housing 81. In particular, the pressure holding member 90 is formed to be coupled to the coffee outlet (81a) by a screw fastening method, and is typically structured by coupling the pressure holding member 90 to the porter filter 80 for extracting high-temperature espresso coffee. There is an advantage that can extract the espresso coffee without any change.

The pressure holding member 90 is composed of a body portion 91, a head portion 92, and a blowout hole 92a. The blowout hole 92a holds a pressure to discharge the extracted coffee to the takeout unit 83. It is formed through the member 90, and has a size smaller than the diameter of the coffee outlet 81a. For example, the blowout hole 92a is formed to penetrate in the longitudinal direction from the central portion of the pressure holding member 90. On the other hand, as another embodiment of the pressure holding member 90, a groove-shaped extraction hole in which an outer portion of the pressure holding member 90 is opened may be formed.

Here, the diameter of the blowout hole 92a and the depth and width of the groove are determined by the pressure applied to the filter housing 81.

Body portion 91 is inserted into the coffee outlet (81a) is threaded to be fastened to form a screw having a predetermined diameter.

The head portion 92 is formed to protrude a predetermined height from the surface of the bottom surface 81b of the filter housing 81 when the pressure holding member 90 is coupled to the coffee outlet 81a. Since the head 92 protrudes from the bottom surface 81b, it is possible to effectively prevent a problem that the ejection hole 92a is blocked by the coffee beans included in the extracted coffee.

On the other hand, a gasket (not shown) may be installed between the filter portion 82 and the filter housing 81, the gasket is the filter when the pressure is applied in the filter housing 81 by the pressure holding member 90 It serves to prevent the contents of the portion 82 and the filter housing 81 from leaking out.

Espresso coffee machine (2) according to another embodiment of the present invention of this configuration, when the porter filter 80 is fixed to the filter holder 12 to the porter filter 80 through the second hot water line (72) The hot water (H) is provided to extract the coffee, the extracted coffee is converged to the lower taking-out unit 83 through the take-out hole (92a) of the pressure holding member 90, through the take-out port (83c) 14).

Here, since the diameter of the blowout hole 92a is small, when hot water supplied into the filter housing 81 is initially discharged in small amounts, the hot water completely fills the inside of the filter housing 81 and the filter unit 82. The pressure rises inside the housing 81 and the hot water quickly passes through the outlet 83c by the elevated pressure to extract the coffee.

As a result, it is possible to extract coffee having a stronger flavor and taste.

On the other hand, after putting the tea powder or tea leaves in the filter portion 82 of the porter filter 80, the porter filter 80 is mounted on the filter holder 12 of the main body 10 to provide hot water to the porter filter 80. When supplied, the diameter of the blowout hole 92a is small as described above, so that hot water supplied into the filter housing 81 is first discharged in small amounts, and the hot water is completely inside the filter housing 81 and the filter unit 82. If it is filled, the tea powder or tea leaves in the filter holder 12 are dissolved or wetted reliably and the pressure rises inside the filter housing 81 and the hot water rapidly passes through the outlet port 83c by the elevated pressure. It can be extracted.

Accordingly, as the pressure in the filter housing 81 is maintained by the pressure holding member 90 rather than the tea powder or the tea leaf being simply mixed with water, the hot water is introduced into the filter housing 81 and the filter portion 82. Since the tea powder or tea leaves are dissolved or wetted in warm water during the filling process, the teas having the natural taste and aroma of the tea powder or tea leaves can be extracted.

10: main body 11: operation panel
12: filter holder 12a: water supply nozzle
13: holder 14: coffee container
20: water supply unit 21: water purifier
22: water supply pump 30: boiler
31: heater 40: hot water supply
50: heat exchanger 51: body
52: cold water jet pipe 53: nozzle
60: cold water line 71: the first hot water line
72: second hot water line 80: porter filter
81: filter housing 81a: coffee outlet
81b: bottom surface 81c: first coupling portion
81d: first flange 82: filter part
82a: mesh portion 82b: second flange
83: ejection unit 83a: second coupling portion
83b: ejection guide 83c: ejection opening
84: grip handle 90: pressure holding member
91: body portion 92: head portion
92a: ejection hole C: coffee beans
H: Hot water V: On-off valve

Claims (5)

A main body 10 having a filter holder 12;
A water supply unit 20 installed inside the main body 10 to supply cold water from a water supply source;
Porter filter 80 is coupled to the main body 10 for extracting the espresso coffee;
A boiler (30) installed inside the main body (10) and holding hot water and steam;
A hot water supply unit 40 installed at one side of the boiler 30;
A first hot water line 71 connected to the filter holder 12 and the hot water supplier 40 to supply hot water to the porter filter 80 from the hot water supplier 40;
The cold water is installed on one side of the hot water supply 40 in the boiler 30 and connected to the hot water supply 40 and the water supply 20 to supply the cold water supplied to the inside through the water supply 20. A heat exchanger 50 for supplying hot water to the hot water supply 40 by heat exchange by a boiler 30;
A cold water line (60) connected to the heat exchanger (50) in the water supply unit (20) to allow cold water to be supplied into the heat exchanger (50);
A second hot water line 72 connected directly to the hot water supply 40 in the heat exchanger 50 so that hot water heated by heat exchange in the heat exchanger 50 is always supplied to the hot water supply 40. Espresso coffee machine comprising a. The method of claim 1,
The heat exchanger 50 is
A body 51 having a cylindrical shape,
It is installed in the body 51 and is connected to the cold water line 60 includes a cold water jet pipe 52 for ejecting the cold water supplied through the cold water line 60 into the body 51,
Espresso coffee machine, characterized in that the outer surface of the cold water jet pipe 52, the nozzle 53 for ejecting the cold water evenly to the body 51 is arranged at equal intervals along the longitudinal direction. The method of claim 2,
The espresso coffee machine
Espresso coffee machine, characterized in that a plurality of the heat exchanger (50) and the hot water supply (40) is installed in accordance with the number of the porter filter 80 is mounted on the main body (10). The method of claim 3,
The porter filter 80
A filter portion 82 for receiving the ground coffee beans and having a mesh portion 82a formed thereon;
A filter housing (81) having an upper portion open to allow the filter portion (82) to be mounted thereon, and having a coffee outlet (81a) for discharging the coffee extracted through the lower portion;
A take-out unit (83) coupled to a lower portion of the filter housing (81) to communicate with the coffee outlet (81a) to discharge the extracted coffee;
And
And a pressure holding member (90) inserted into and coupled to the coffee outlet (81a) to maintain pressure in the filter housing (81) when extracting coffee.
The pressure holding member 90 communicates with the filter housing 81 and the taking out unit 83 through the pressure holding member 90 so as to discharge the extracted coffee to the take out unit 83. A blowout hole 92a is formed,
Espresso coffee machine, characterized in that the gasket is provided between the filter unit 82 and the filter housing (81). 5. The method of claim 4,
The pressure holding member 90,
A body portion 91 having a screw shape to be insertable and fastened to the coffee outlet 81a; And
Espresso coffee machine comprising a; the head portion (92) formed to protrude from the bottom surface of the filter housing (81) when the body portion (91) is coupled to the coffee outlet (81a).

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