CN111568204B

CN111568204B - Waterway system of coffee machine

Info

Publication number: CN111568204B
Application number: CN202010494635.7A
Authority: CN
Inventors: 毛海燕
Original assignee: Suzhou DrCoffee System Technology Co ltd
Current assignee: Suzhou DrCoffee System Technology Co ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2024-09-13
Anticipated expiration: 2040-06-03
Also published as: WO2021244128A1; CN111568204A

Abstract

The invention discloses a waterway system of a coffee machine, which comprises: the device comprises a first hot water loop, a second hot water loop, a coffee making loop and a milk foam making loop, wherein the first hot water loop comprises a water tank, a first two-way electromagnetic valve, a first flowmeter, a first water pump, a first heating device and a second two-way electromagnetic valve; the second hot water loop comprises a water tank, a first two-way electromagnetic valve, a second flowmeter, a second water pump, a second heating device and a fifth two-way electromagnetic valve; the coffee making loop comprises a water tank, a first two-way electromagnetic valve, a second flowmeter, a second water pump, a second heating device, a second one-way valve and a coffee brewing device; the milk foam manufacturing loop comprises a water tank, a first two-way electromagnetic valve, a first flowmeter, a first water pump, a first heating device, a fourth two-way electromagnetic valve and a milk heating device which are connected in sequence. According to the water path system of the coffee machine, provided by the invention, the full electromagnetic valve is controlled, so that the stability of the water path system of the coffee machine is improved, and the risk of water leakage faults of the water path system is reduced.

Description

Waterway system of coffee machine

Technical Field

The invention relates to the technical field of coffee machines, in particular to a waterway system of a coffee machine.

Background

Coffee has become one of the most important beverages for modern people, wherein American coffee is a popular coffee type, and the American coffee machine on the market at present is generally realized by prolonging the time for hot water to pass through coffee powder, however, the long-time hot water brewing of the coffee powder not only affects the taste of the coffee, but also is unfavorable for human health because of high caffeine content; some fully automatic coffee machines are based on making an espresso, which individually dilute the strength of the espresso from the hot water circuit, which also affects the mouthfeel of the espresso and reduces the efficiency of the cup out of the espresso. The waterway system of the full-automatic coffee machine in the market is mainly controlled by a diverter valve to switch waterways, the mechanical control and long-time friction are easy to cause water leakage and other faults, the switching time can influence the cup outlet efficiency of beverages, and when the full-automatic coffee machine in the market is used for making milk and coffee, the coffee is generally made first and then milk is made or the milk is made first and then the coffee is made, and then the milk and the coffee are stirred and eaten, so that the cup outlet efficiency of the milk and the coffee is influenced.

Disclosure of Invention

The invention mainly solves the technical problems that the waterway system of the coffee machine is controlled by the full-electromagnetic valve, is safer and more stable than the waterway system of the coffee machine in the market, has higher efficiency, and solves the problems that the waterway system is controlled by the directional valve of the full-automatic coffee machine in the market, the cup outlet efficiency of the beverage making is influenced, and the use quality of the full-automatic coffee machine is influenced.

In order to solve the technical problems, the invention adopts a technical scheme that: a waterway system of a coffee machine, comprising: the coffee machine comprises a first hot water loop, a second hot water loop, a coffee making loop and a milk foam making loop, wherein the first hot water loop comprises a water tank, a first two-way electromagnetic valve, a first flowmeter, a first water pump, a first heating device and a second two-way electromagnetic valve which are connected in sequence; the second hot water loop comprises a water tank, a first two-way electromagnetic valve, a second flowmeter, a second water pump, a second heating device and a fifth two-way electromagnetic valve which are connected in sequence; the hot water flowing out of the second two-way electromagnetic valve outlet and the hot water flowing out of the fifth two-way electromagnetic valve outlet are converged to a total hot water outlet; the coffee making loop comprises a water tank, a first two-way electromagnetic valve, a second flowmeter, a second water pump, a second heating device, a second one-way valve and a coffee brewing device which are connected in sequence; the milk foam manufacturing loop comprises a water tank, a first two-way electromagnetic valve, a first flowmeter, a first water pump, a first heating device, a fourth two-way electromagnetic valve and a milk heating device which are sequentially connected, one way of the milk heating device is connected with a check valve and an air pump, and the other way of the milk heating device is connected with a milk storage container.

In a preferred embodiment of the invention, the milk foam making circuit further comprises a third two-way electromagnetic valve connected with the first heating device, wherein the third two-way electromagnetic valve is connected with the waste water collector, and can release the redundant water vapor pressure in the milk foam making circuit into the waste water collecting device.

In a preferred embodiment of the invention, a pinch valve is arranged on the pipeline between the milk storage container and the milk heating device.

In a preferred embodiment of the present invention, the milk heating device further comprises a three-way electromagnetic valve connected with the first water pump, wherein when the first inlet and the second outlet of the three-way electromagnetic valve are communicated, the three-way electromagnetic valve is communicated with the milk heating device; when the first inlet and the third outlet of the three-way electromagnetic valve are communicated, the three-way electromagnetic valve is communicated with the second hot water loop to provide cold water to the second hot water loop so as to make ice coffee.

In a preferred embodiment of the present invention, the three-way solenoid valve supplies cold water for cleaning the remaining milk to the milk heating apparatus when the first inlet and the second outlet of the three-way solenoid valve are in communication.

In a preferred embodiment of the present invention, when the first inlet and the third outlet of the three-way electromagnetic valve are communicated, the three-way electromagnetic valve is connected with the first one-way valve, and water in the three-way electromagnetic valve finally flows to the total hot water outlet through the first one-way valve.

In a preferred embodiment of the invention, after the coffee is made in the coffee making circuit, a pressure release valve arranged in the coffee brewing device discharges the waste water to the waste water collecting device under the drive of a stepping motor.

The beneficial effects of the invention are as follows: compared with the prior art, the water path system of the coffee machine is controlled by the full-electromagnetic valve, is safer and more stable than the water path system of the coffee machine in the market, has higher efficiency, and solves the problems that the full-automatic coffee machine in the market is controlled by a branch valve to influence the cup outlet efficiency of the beverage making and the use quality of the full-automatic coffee machine; the problem that when the full-automatic coffee machine in the market is incapable of making American coffee, coffee and hot water cannot be discharged simultaneously is solved, the taste of the American coffee is ensured, meanwhile, the coffee factors cannot be excessively extracted, and the health of a human body is ensured; the problem that coffee and milk cannot be discharged simultaneously when a full-automatic coffee machine in the market cannot produce milk and coffee beverages is solved, and the cup discharging efficiency of the coffee machine for producing milk and coffee is improved; the invention provides a scheme for making ice American coffee, enriches the types of beverages of a coffee machine and meets the market demand; the invention provides a scheme for automatically cleaning a milk system, so that a coffee machine can clean the milk system in time, and the interior of the coffee machine is clean and bacteria are not bred.

Drawings

For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

fig. 1 is a schematic diagram of a waterway system of a coffee maker of the present invention.

Detailed Description

The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, an embodiment of the present invention includes: a waterway system of a coffee machine, comprising: the device comprises a first hot water loop, a second hot water loop, a coffee making loop and a milk foam making loop, wherein the first hot water loop comprises a water tank 1, a first two-way electromagnetic valve 2, a first flowmeter 3, a first water pump 4, a first heating device 5 and a second two-way electromagnetic valve 6 which are connected in sequence; the second hot water loop comprises a water tank 1, a first two-way electromagnetic valve 2, a second flowmeter 17, a second water pump 18, a second heating device 19 and a fifth two-way electromagnetic valve 20 which are connected in sequence; the hot water flowing out of the second two-way electromagnetic valve outlet and the hot water flowing out of the fifth two-way electromagnetic valve outlet are converged to a total hot water outlet 23; the coffee making circuit comprises a water tank 1, a first two-way electromagnetic valve 2, a second flowmeter 17, a second water pump 18, a second heating device 19, a second one-way valve 21 and a coffee brewing device 22 which are connected in sequence; the milk foam manufacturing loop comprises a water tank 1, a first two-way electromagnetic valve 2, a first flowmeter 3, a first water pump 4, a first heating device 5, a fourth two-way electromagnetic valve 9 and a milk heating device 12 which are sequentially connected, one way of the milk heating device is connected with a check valve 10 and an air pump 11, the other way of the milk heating device is connected with a milk storage container 13, a pinch valve 14 is arranged on a pipeline between the milk storage container and the milk heating device, the milk foam manufacturing loop further comprises a third two-way electromagnetic valve 7 connected with the first heating device, the third two-way electromagnetic valve is connected with a waste water collector 8, and redundant steam pressure in the milk foam manufacturing loop can be released into the waste water collector.

Specifically, the milk foam making circuit comprises a third two-way electromagnetic valve 7 connected with the first heating device 5, so that redundant steam pressure can be released into the waste water collecting device 8, the rest steam flows to the milk heating device 12 through a fourth two-way electromagnetic valve 9 which is electrified, the air pump 11 sucks air through the check valve 10 to lead to the milk heating device 12 when making milk foam, and milk flows from the milk storage container 13 to the milk heating device 12 through the pinch valve 14; when the second two-way electromagnetic valve 6 is electrified, hot water in the first heating device flows to the total hot water outlet 23, and when the fifth two-way electromagnetic valve 20 connected with the second heating device 19 is electrified, hot water flows to the total hot water outlet.

Further, the waterway system of the present invention further includes a three-way solenoid valve 15 connected to the first water pump, and when the first inlet 151 of the three-way solenoid valve is communicated with the second outlet 152, the three-way solenoid valve is communicated with the milk heating device and supplies cold water for cleaning the remaining milk to the milk heating device; when the first inlet 151 and the third outlet 153 of the three-way solenoid valve are in communication, the three-way solenoid valve is connected to the first one-way valve 16, and water in the first one-way valve finally flows to the total hot water outlet 23 to supply cold water to the second hot water circuit to make ice coffee.

When the first inlet 151 and the third outlet 153 are connected, the three-way electromagnetic valve 15 connected with the first water pump 4 can guide cold water to the total hot water outlet through the first one-way valve 16 connected with the three-way electromagnetic valve 15 for making ice coffee; when coffee is made, the second one-way valve 21 connected with the second heating device 19 can guide hot water into the coffee brewing device 22, then coffee flows out of the coffee brewing device 22 into the coffee cup 25, and after the coffee is made, the pressure release valve arranged in the coffee brewing device discharges waste water into the waste water collecting device under the drive of the stepping motor.

The waterway system of the coffee machine is more flexible, convenient and efficient in the process of preparing beverages, and can be explained from the following functions:

a. method of making espresso and flow direction of water:

The water flows into the coffee cup through the water tank 1, the first two-way electromagnetic valve 2, the second flowmeter 17, the second water pump 18, the second heating device 19, the second one-way valve 21 and the coffee brewing device 22; in the manufacturing process, only the first two solenoid valves 2 are electrified to enable the inlet 21 and the outlet 22 to be communicated, and after the manufacturing is finished, the stepping motor is electrified to drive the pressure release valve embedded in the coffee brewing device 22 to discharge the wastewater into the wastewater collection device 8.

B. method for making American coffee and flow direction of water:

Wherein American coffee making is consistent with Italian coffee making; the water flows to the total hot water outlet through the water tank 1, the first two-way electromagnetic valve 2, the first flowmeter 3, the first water pump 4, the first heating device 5 and the second two-way electromagnetic valve 6, because the waterway system provided by the invention is provided with two heating devices, hot water can be simultaneously provided for a plurality of loops, wherein the first heating device 5 can provide water vapor and hot water, the second heating device 19 can provide hot water for the second hot water loop module and the coffee making loop module, and when making American coffee, the hot water for making the American coffee is from the second heating device 5 and the hot water for supplementing is from the first heating device 19 and is from different heating devices, so that the coffee and the hot water can be simultaneously discharged to make American coffee on the basis of not lengthening the time for making beverages, the cup discharging efficiency of the American coffee is improved, the mouthfeel of the American coffee is ensured, and meanwhile, the coffee factor is not excessively extracted, and the health degree of the beverage is ensured.

In the manufacturing process, the first two-way electromagnetic valve 2 is electrified, so that the inlet 21 and the outlet 22 of the first two-way electromagnetic valve are communicated, water is supplied to two heating device loops, the second two-way electromagnetic valve 6 is electrified, so that the inlet 61 and the outlet 62 of the second two-way electromagnetic valve are communicated, and hot water in the first heating device 5 is supplied to the total hot water outlet.

After the manufacture is finished, the stepping motor is electrified to drive a pressure release valve embedded in the coffee brewing device 22 to discharge the wastewater into the wastewater collection device 8.

C. Method for making ice American coffee and flow direction of water:

The method for making ice American coffee is similar to that for making American coffee, and the coffee making circuit is identical to that for making Italian coffee, except that the hot water circuit of American coffee is changed into a cold water circuit, and the flow direction of water in the cold water circuit is as follows: the water flows to the total hot water outlet through the water tank 1, the first two-way electromagnetic valve 2, the first flowmeter 3, the first water pump 4, the three-way electromagnetic valve 15 and the first one-way valve 16, and then flows to the coffee cup 24 with ice cubes, cold water in the first water pump 4 is guided into the second hot water loop through the three-way electromagnetic valve 15, so that ice American coffee is manufactured, the functions are more than those of a full-automatic coffee machine on the market, the variety of machine beverages of the coffee machine are enriched, and the customer demands are met.

In the manufacturing process, only the first two-way electromagnetic valve 2 is electrified, so that the inlet 21 and the outlet 22 of the first two-way electromagnetic valve are communicated to provide hot water for the coffee manufacturing circuit, and meanwhile, the lower coil of the three-way electromagnetic valve 15 is electrified, so that the first inlet 151 and the third outlet 153 are communicated, and cold water is provided for a module of the second hot water circuit to manufacture ice American coffee.

D. method for separately preparing hot water and flow direction of water:

The water flows to the total hot water outlet through the water tank 1, the first two-way solenoid valve 2, the second flowmeter 17, the second heating device 19, and the fifth two-way solenoid valve 20.

During the manufacturing process, only the first two-way electromagnetic valve 2 enables the inlet 21 to be communicated with the outlet 22, hot water is supplied to the module of the second hot water circuit, and the fifth two-way electromagnetic valve 20 is electrified, so that the inlet 201 and the outlet 202 are communicated, and hot water is supplied to the total hot water outlet.

E. A method for preparing hot milk or milk foam by using steam and the flow direction of water:

First, the flow direction of water when making hot milk: the water passes through the water tank 1, the first two-way electromagnetic valve 2, the first flowmeter 3, the first water pump 4, the first heating device 5, the third two-way electromagnetic valve 7, the waste water collecting device 8, the fourth two-way electromagnetic valve 9 and the milk heating device 12, when the water vapor passes through the milk heating device 12, the milk passes through the pinch valve 14 from the milk storage container 13 to the milk heating device 12 for heating by mixing with the water vapor,

Secondly, the flow direction of water when milk foam is produced: the method for preparing milk foam is that an air loop is added on the basis of preparing hot milk, in the normal milk preparing process, the air pump 11 can suck air into the milk heating device 12 through the check valve 10, and the hot milk realizes the milk foam preparing function after high-pressure air is introduced into the heating device 12.

In the process of making hot milk or milk foam, the first two-way electromagnetic valve 2 is electrified, so that the inlet 21 and the outlet 22 are communicated, water is supplied to the first heating device 5, the third two-way electromagnetic valve 7 is electrified firstly after receiving high-pressure steam from the first heating device 5, so that the inlet 71 and the outlet 72 are communicated, the surplus pressure is released into the waste water collecting device 8, after the surplus pressure is discharged, the third two-way electromagnetic valve is powered off, so that the inlet 71 and the outlet 72 are closed, then the fourth two-way electromagnetic valve 9 is electrified, so that the inlet 91 and the outlet 92 are communicated, and the rest of the hot steam is communicated into the milk heating device 12 for heating milk.

F. a method for preparing milk coffee and the flow direction of water;

The water path system of the coffee machine can realize simultaneous manufacture of coffee and milk by adopting a double-heating device design, when milk coffee is required to be manufactured, water flows into a coffee cup through a pipeline after passing through the water tank 1, the first two-way electromagnetic valve 2, the second flowmeter 17, the second water pump 18, the second heating device 19, the second one-way valve 21 and the coffee brewing device 22, and hot milk can also be manufactured simultaneously when coffee is manufactured, namely, the water flows into a coffee manufacturing loop through the water tank 1 and the first two-way electromagnetic valve 2, and simultaneously flows into the coffee manufacturing loop through the first two-way electromagnetic valve 2, the first flowmeter 3, the first water pump 4, the first heating device 5, the third two-way electromagnetic valve 7, the waste water collecting device 8, the fourth two-way electromagnetic valve 9 and the milk heating device 12, and when water vapor is led into the milk heating device 12, the milk is led into the milk heating device 12 from the milk storage container 13 through the pinch valve 14 to be heated, and then the hot milk and the hot coffee flow into the cup simultaneously, so that the coffee and the milk coffee at the time and the coffee manufacturing time are realized. Compared with the water path system of the full-automatic coffee machine in the market, the water path system of the coffee machine adopts the double heating systems to provide hot water and hot steam for the milk foam making loop, and the water path system of the coffee machine is different from the full-automatic coffee machine in the market that coffee is needed to be made first and then hot milk is needed to be made, so that the cup outlet efficiency of making milk and coffee is improved.

G. the realization method of the automatic cleaning milk system and the flow direction of water are as follows:

after the hot milk or the milk coffee is prepared, the milk system needs to be cleaned in time to ensure that the use of the milk system is not influenced when the milk coffee is prepared next time, the sanitation and the sanitation of the milk system are also ensured, the bacteria are prevented from breeding, the invention provides an embodiment of the automatic cleaning of the milk system, after the coffee machine starts a milk system cleaning program, cold water flows to the milk heating device 12 through the water tank 1, the first two-way electromagnetic valve 2, the first flowmeter 3, the first water pump 4 and the three-way electromagnetic valve 15, and redundant milk in the milk system is cleanly discharged into the water cup, so that the function of automatically cleaning the milk system is realized.

During the cleaning process, only the first two-way solenoid valve 2 is energized, so that the inlet 21 and the outlet 22 are turned on, water for cleaning is supplied to the first water pump 4, and the coil on the three-way solenoid valve connected to the first water pump 4 is also energized, so that the first inlet 151 and the second outlet 152 are turned on, and cold water is supplied to the milk heating device 12 for cleaning.

The waterway system of the coffee machine adopts full electromagnetic valve control, is different from the control of the branch water supply by adopting the branch valves in the market, improves the stability of the waterway system of the coffee machine, reduces the risks of water leakage and other faults of the waterway system of the coffee machine, simultaneously avoids the switching time of the branch valves, and improves the beverage making efficiency of the coffee machine; the second two-way electromagnetic valve 6 is used for controlling whether the hot water in the first heating device 5 is supplied to the first hot water circuit, and when American coffee needs to be made, the second two-way electromagnetic valve 6 is powered on and powered off at other times. The third two-way electromagnetic valve is used for controlling whether the water vapor from the first heating device 5 needs to be decompressed, and when hot milk or milk foam is needed to be produced, the third two-way electromagnetic valve 7 is electrified, and the original power-off state is returned after the decompression is finished; the fourth two-way electromagnetic valve 9 is used for controlling whether the decompressed hot water vapor can be led into the milk heating device 12, and after the decompression is finished, the fourth two-way electromagnetic valve 9 is electrified and is powered off at other times; the three-way electromagnetic valve 15 is used for controlling whether clean water is provided to the milk heating device 12 and whether cold water is provided to the hot water making module to make ice American coffee, when the milk system is required to be cleaned, the upper coil of the three-way electromagnetic valve 15 is electrified, so that the first inlet 151 and the second outlet 152 are communicated, water is supplied to the milk heating device 12, when the ice American coffee is required to be made, the lower coil of the three-way electromagnetic valve 15 is electrified, the first inlet 151 and the third outlet 153 are communicated, cold water is provided to the second hot water loop to make ice American coffee, and other times are powered off; the fifth two-way electromagnetic valve 20 is used for controlling whether the hot water from the second heating device 19 is supplied to the coffee making circuit, and when the coffee needs to be made, the fourth two-way electromagnetic valve 20 is powered on and powered off at other times.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.

Claims

1. A waterway system of a coffee machine, comprising: the coffee machine comprises a first hot water loop, a second hot water loop, a coffee making loop and a milk foam making loop, wherein the first hot water loop comprises a water tank, a first two-way electromagnetic valve, a first flowmeter, a first water pump, a first heating device and a second two-way electromagnetic valve which are connected in sequence; the second hot water loop comprises a water tank, a first two-way electromagnetic valve, a second flowmeter, a second water pump, a second heating device and a fifth two-way electromagnetic valve which are connected in sequence; the hot water flowing out of the second two-way electromagnetic valve outlet and the hot water flowing out of the fifth two-way electromagnetic valve outlet are converged to a total hot water outlet; the coffee making loop comprises a water tank, a first two-way electromagnetic valve, a second flowmeter, a second water pump, a second heating device, a second one-way valve and a coffee brewing device which are connected in sequence; the milk foam manufacturing loop comprises a water tank, a first two-way electromagnetic valve, a first flowmeter, a first water pump, a first heating device, a fourth two-way electromagnetic valve and a milk heating device which are sequentially connected, one way of the milk heating device is connected with a check valve and an air pump, the other way of the milk heating device is connected with a milk storage container, the milk foam manufacturing loop also comprises a three-way electromagnetic valve connected with the first water pump, and when a first inlet and a second outlet of the three-way electromagnetic valve are communicated, the three-way electromagnetic valve is communicated with the milk heating device; when the first inlet and the third outlet of the three-way electromagnetic valve are communicated, the three-way electromagnetic valve is communicated with the second hot water loop to provide cold water to the second hot water loop so as to prepare ice coffee, and when the first inlet and the third outlet of the three-way electromagnetic valve are communicated, the three-way electromagnetic valve is connected with the first one-way valve, and water in the three-way electromagnetic valve finally flows to the total hot water outlet through the first one-way valve;

method for making American coffee and flow direction of water: the water flows to a total hot water outlet through a water tank, a first two-way electromagnetic valve, a first flowmeter, a first water pump, a first heating device and a second two-way electromagnetic valve, wherein the first heating device can provide water vapor or hot water, the second heating device can provide hot water for a second hot water loop module and a coffee making loop module, in the manufacturing process, the first two-way electromagnetic valve is electrified so that an inlet and an outlet of the first two-way electromagnetic valve are communicated, water is supplied to two heating device loops, the second two-way electromagnetic valve is electrified so that an inlet and an outlet of the second two-way electromagnetic valve are communicated, hot water in the first heating device is supplied to the total hot water outlet, and after the manufacturing is finished, a stepping motor is electrified to drive a pressure release valve embedded in the coffee making device to discharge waste water into a waste water collecting device;

Method for making ice American coffee and flow direction of water: the water flows to the total hot water outlet through the water tank, the first two-way electromagnetic valve, the first flowmeter, the first water pump, the three-way electromagnetic valve and the first one-way valve, then flows to the coffee cup with ice cubes, cold water in the first water pump is guided to the second hot water loop through the three-way electromagnetic valve, only the first two-way electromagnetic valve is electrified in the manufacturing process, so that the inlet and the outlet of the first two-way electromagnetic valve are communicated, hot water is provided for the coffee manufacturing loop, meanwhile, the lower coil of the three-way electromagnetic valve is electrified, so that the first inlet and the third outlet are communicated, and cold water is provided for a module of the second hot water loop to manufacture ice American coffee.

2. The waterway system of coffee machine of claim 1, wherein the milk foam making circuit further includes a third two-way solenoid valve coupled to the first heating device, the third two-way solenoid valve coupled to the waste water collector to release excess water vapor pressure in the milk foam making circuit to the waste water collector.

3. The waterway system of coffee machine of claim 1, wherein a pinch valve is provided on a line between the milk container and the milk heating device.

4. The waterway system of coffee machine of claim 1, wherein the three-way solenoid valve provides cold water for cleaning remaining milk to the milk heating device when the first inlet and the second outlet of the three-way solenoid valve are in communication.

5. The waterway system of coffee machine of claim 1, wherein after coffee is made in the coffee making circuit, a pressure release valve provided in the coffee brewing apparatus discharges waste water to the waste water collecting apparatus under the driving of the stepping motor.