Automatic drainage and cleaning system for boiler and automatic cleaning method therefor

Abstract

The present application relates to the technical field of coffee machines, and in particular to an automatic drainage and cleaning system for a boiler and an automatic cleaning method therefor. The automatic drainage and cleaning system for a boiler comprises: a water storage container, a water pump, a heating container, a three-way solenoid valve, a coffee preparation member, a solenoid valve and a wastewater container, wherein the water storage container, the water pump and the heating container are sequentially in communication with one another; the heating container is in communication with the coffee preparation member and the wastewater container by means of the three-way solenoid valve; and a pipeline that is in communication between the heating container and the water pump is in communication with the wastewater container by means of a pipe fitting and the solenoid valve. The automatic drainage and cleaning system for a boiler provided in the present application can realize self-cleaning and drainage of the heating container such as a boiler, is simple and convenient to operate, does not require manual disassembly for cleaning, and further does not require the assistance of professionals, is user-friendly and convenient, is time-saving and labor-saving, and can reduce subsequent maintenance costs.

Description

Boiler automatic drainage cleaning system and automatic cleaning method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311049126.3, filed with the Chinese Patent Office on August 18, 2023, entitled “Automatic Boiler Drainage Cleaning System and Automatic Cleaning Method Thereof,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of coffee machines, and in particular to an automatic boiler drainage and cleaning system and an automatic cleaning method thereof. Background Art

[0004] Currently, coffee machines often heat water for extracting coffee, and it is difficult to avoid the formation of scale in pipes and boilers. When the scale accumulates for a certain period of time, it will affect the normal use of the coffee machine.

[0005] Application Contents

[0006] The purpose of this application is to provide a boiler automatic drainage and cleaning system and an automatic cleaning method thereof, which to a certain extent solves the technical problem in the prior art that scale is easily generated in the pipes and boilers of the coffee machine, and when the scale accumulates for a certain period of time, it will affect the normal use of the coffee machine.

[0007] The present application provides a boiler automatic drainage and cleaning system, comprising: a water storage container, a water pump, a heating container, a three-way solenoid valve, a coffee preparation component, a solenoid valve, and a wastewater container;

[0008] The water storage container, the water pump and the heating container are sequentially connected; the heating container is respectively connected to the coffee preparation component and the waste water container via the three-way solenoid valve;

[0009] The pipeline communicating between the heating container and the water pump is connected to the waste water container through a pipe fitting and the solenoid valve.

[0010] In the above technical solution, further, a water inlet is provided at the top of the water storage container along the height direction thereof, and along the height direction of the water storage container, the solenoid valve is lower than the water inlet.

[0011] In any of the above technical solutions, further, a water inlet joint is installed at the water inlet, and the water inlet joint forms a water inlet pipe extending to the bottom of the heating container, and the water inlet pipe is set deviated from the center line of the heating container along its height direction, so that the water outlet of the water inlet pipe deviates from the center line setting.

[0012] In any of the above technical solutions, further, a virtual line is formed between the water outlet of the water inlet pipe and the midpoint of the virtual horizontal plane in the heating container flush with it, and the direction of the virtual line and the water outlet of the water inlet pipe is an acute angle or a right angle.

[0013] In any of the above technical solutions, further, the water inlet pipe is bent near the bottom of the heating container, and the water outlet of the water inlet pipe is parallel to or arranged at an acute angle to the bottom of the heating container.

[0014] In any of the above technical solutions, further, the water inlet pipe is L-shaped near the bottom of the heating container.

[0015] In any of the above technical solutions, further, the heating container includes a container body and a heating tube, and the heating tube is arranged in the container body.

[0016] In any of the above technical solutions, further, the wastewater container is arranged below the water storage container.

[0017] In any of the above technical solutions, further, the water storage container is arranged below the water storage container.

[0018] In any of the above technical solutions, further, a water outlet is formed at the top of the water storage container along its height direction.

[0019] In any of the above technical solutions, further, the coffee preparation component is an extraction head or a steam nozzle.

[0020] The present application also provides an automatic cleaning method for a boiler automatic drainage cleaning system, including the boiler automatic drainage cleaning system described in any of the above technical solutions, and thus has all the beneficial technical effects of the boiler automatic drainage cleaning system, which will not be repeated here.

[0021] In the above technical solution, further, the automatic cleaning method of the boiler automatic drainage cleaning system includes the following steps:

[0022] Step 1: Automatically drain the boiler:

[0023] Step 1-1: using the three-way solenoid valve to close the water passages formed between the heating container and the coffee preparation component and the waste water container, and to open the water passage between the coffee preparation component and the waste water container, thereby draining the residual water in the water passages;

[0024] Step 1-2: Start the water pump to pump water from the water storage container into the heating container for pressurization, then turn off the water pump and open the solenoid valve. The pressure in the heating container will cause the water in the heating container to flow out and pass through the solenoid valve into the waste water container.

[0025] Step 1-3: When the pipe connecting the solenoid valve and the heating container is filled with water, the three-way solenoid valve is used to open the water passage between the heating container and the coffee preparation component and / or the waste water container, thereby connecting the heating container to the outside atmosphere and finally draining all the water in the heating container;

[0026] Step 2: Automatic flushing or pressure-maintaining soaking;

[0027] The automatic flushing step includes: when the water in the heating container is emptied, closing the solenoid valve, starting the water pump, and pumping water from the water storage container into the heating container to flush the interior of the heating container;

[0028] The pressure-maintaining soaking step comprises: when the water in the heating container is emptied, closing the solenoid valve, and using the three-way solenoid valve to close the water path between the heating container, the coffee preparation component, and the waste water container; then, placing a descaling agent into the water storage container, starting the water pump, and pumping the water mixed with the descaling agent from the water storage container into the heating container;

[0029] Step 1 and step 2 can be repeated.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The automatic boiler drainage and cleaning system provided in this application can realize self-cleaning and drainage of heating containers such as boilers. It is simple and convenient to operate, does not require manual disassembly and cleaning, and does not require the help of professionals. It is user-friendly and convenient, and saves time and effort, reducing subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a schematic structural diagram of a boiler automatic drainage cleaning system provided in an embodiment of the present application;

[0034] FIG2 is a cross-sectional view of a heating container provided in an embodiment of the present application;

[0035] FIG3 is another cross-sectional view of the heating container provided in an embodiment of the present application.

[0036] Reference numerals: 1-water storage container, 2-water pump, 3-heating container, 31-container body, 32-heating tube, 33-water inlet connector, 34-water inlet pipe, 35-water outlet connector, 4-three-way solenoid valve, 5-coffee preparation component, 6-solenoid valve, 7-wastewater container. DETAILED DESCRIPTION

[0037] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0038] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0039] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0040] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0042] The following describes an automatic boiler drainage cleaning system and an automatic cleaning method thereof according to some embodiments of the present application with reference to FIG. 1 to FIG. 3 .

[0043] Example 1

[0044] 1 , an embodiment of the present application provides a boiler automatic drainage and cleaning system, comprising: a water storage container 1, a water pump 2, a heating container 3, a three-way solenoid valve 4, a coffee preparation component 5, a solenoid valve 6, and a wastewater container 7;

[0045] The water storage container 1, the water pump 2 and the heating container 3 are connected in sequence; the heating container 3 is connected to the coffee preparation component 5 and the waste water container 7 respectively via a three-way solenoid valve 4;

[0046] The pipeline connecting the heating container 3 and the water pump 2 is connected to the waste water container 7 through a pipe fitting and a solenoid valve 6. It should be noted that the communication between the above components is through pipes to form a waterway, which is a prior art and will not be described in detail here.

[0047] Note: In this embodiment, the coffee preparation component 5 is an extraction head, which can be used for coffee extraction. Of course, it is not limited to this. The coffee preparation component 5 can also be a steam nozzle, which can be used for milk foaming. Both are accessories of the coffee machine in the prior art and will not be described in detail here.

[0048] Based on the structure described above, the working process of the boiler automatic drainage cleaning system provided by this application is as follows:

[0049] During normal extraction / steam production, the water pump 2 is started, the solenoid valve 6 is closed, and the three-way solenoid valve 4 opens the water path between the heating container 3 and the coffee preparation component 5. Water is pumped from the water storage container 1 into the heating container 3, and the hot water or steam originally on the top of the heating container 3 is discharged and reaches the coffee preparation component 5 through the three-way solenoid valve 4, thereby performing extraction or milk frothing (note: hot water is output during extraction, and steam is output during milk frothing);

[0050] When self-cleaning is performed, the specific steps include:

[0051] Step 1: Automatically drain the boiler:

[0052] Step 1-1: Use the three-way solenoid valve 4 to close the water passages formed between the heating container 3 and the coffee preparation component 5 and the waste water container 7, and open the water passage between the coffee preparation component 5 and the waste water container 7 to drain the residual water in the water passages;

[0053] Step 1-2: Start the water pump 2 to pump water from the water storage container 1 into the heating container 3 for pressurization. Then, turn off the water pump 2 and open the solenoid valve 6. The pressure in the heating container 3 will cause the water in the heating container 3 to flow out and enter the waste water container 7 through the solenoid valve 6.

[0054] Step 1-3: When the pipe connecting the solenoid valve 6 and the heating container 3 is filled with water, the three-way solenoid valve 4 is used to open the water passage between the heating container 3 and the coffee preparation component 5 and / or the waste water container 7 (note: the coffee preparation component 5 and the waste water container 7 are both connected to the outside atmosphere. Therefore, the water passage between the heating container 3 and either or both of them can be opened to connect the heating container 3 to the outside atmosphere). This allows the heating container 3 to be connected to the outside atmosphere, and ultimately drains all the water from the heating container 3.

[0055] Step 2: Automatic flushing or pressure-maintaining soaking;

[0056] The automatic flushing step includes: when the water in the heating container 3 is emptied, closing the solenoid valve 6, starting the water pump 2, and pumping water from the water storage container 1 into the heating container 3 to flush the interior of the heating container 3;

[0057] The pressure-maintaining soaking step: when the water in the heating container 3 is emptied, the solenoid valve 6 is closed, and the water path between the heating container 3, the coffee preparation component 5, and the waste water container 7 is closed using the three-way solenoid valve 4. Then, a descaling agent is placed in the water storage container 1, and the water pump 2 is started to pump the water mixed with the descaling agent from the water storage container 1 into the heating container 3.

[0058] Step 1 and step 2 can be repeated, that is, the system can realize multiple working modes, for example:

[0059] Cleaning mode: empty - maintain pressure and soak - empty - rinse - empty - refill with water;

[0060] Daily mode: empty - flush - empty - refill;

[0061] Deep cleaning: drain - soak at pressure - drain - rinse - drain - rinse - drain - refill with water.

[0062] It should be noted that: refilling water is to start the water pump 2, inject clean water into the boiler, and then open the corresponding water channel for extraction or milk frothing. This process is relatively conventional and will not be described in detail here.

[0063] It can be seen that the boiler automatic drainage and cleaning system provided in this application can realize self-cleaning and drainage of the heating container 3, such as the boiler. It is simple and convenient to operate, does not require manual disassembly and cleaning, and does not require the help of professionals. It is user-friendly and convenient, and saves time and effort, reducing subsequent maintenance costs.

[0064] In the embodiment, preferably, as shown in FIG1 and FIG2 , a water inlet is provided at the top of the water storage container 1 along its height direction, and along the height direction of the water storage container 1 , the solenoid valve 6 is lower than the water inlet.

[0065] According to the structure described above, the solenoid valve 6 is lower than the water inlet, forming a height difference, which helps to quickly empty the water in the heating container 3.

[0066] In this embodiment, preferably, as shown in Figure 2, a water inlet joint 33 is installed at the water inlet, and the water inlet joint 33 forms a water inlet pipe 34 extending to the bottom of the heating container 3, and the water inlet pipe 34 is set deviating from the center line of the heating container 3 along its height direction, so that the water outlet of the water inlet pipe 34 is set deviating from the center line.

[0067] Further, preferably, as shown in Figures 2 and 3, the heating container 3 includes a container body 31 and a heating tube 32. The heating tube 32 is arranged in the container body 31 and is spirally arranged from bottom to top along the height direction of the container body 31; the water outlet of the water inlet pipe 34 is arranged in the annular space enclosed by the heating tube 32. Of course, it is not limited to this. The water outlet of the water inlet pipe 34 can also be arranged outside the annular space enclosed by the heating tube 32, and the specific selection is based on actual needs.

[0068] Furthermore, preferably, the heating container 3 is a boiler. Of course, it can be other heating devices having the above structure, and is not limited to a boiler.

[0069] According to the structure described above, the water outlet of the water inlet pipe 34 deviates from the center position of the heating container 3, such as the boiler, but is arranged close to the inner wall of the heating container 3. When water enters the boiler, a water vortex will be formed from the bottom. The water vortex can more effectively wash the inner wall of the boiler and the surface of the heating components such as the heating tube, thereby achieving the purpose of descaling.

[0070] Of course, the structure of the heating tube is not limited to the above, and can also be designed according to actual needs. For example, there are multiple heating tubes, and each of them is arranged on the inner wall of the container body 31 or inside the container body 31. The heating tube can be arranged along the height direction of the inner wall of the container body 31, or it can be arranged at an angle, or it can be arranged in a ring shape, etc.

[0071] Further, preferably, as shown in Figures 2 and 3, a connecting line is formed between the water outlet of the water inlet pipe 34 and the midpoint of the virtual horizontal plane in the heating container 3 that is flush with it (and note that this virtual horizontal plane is perpendicular to the height direction of the heating container 3), and the direction of this virtual connecting line and the water outlet of the water inlet pipe 34 is an acute angle or a right angle, that is, the water outlet is avoided from facing the center of the heating container 3, thereby preventing the generation of vortexes.

[0072] Furthermore, preferably, as shown in FIG2 and FIG3 , the water inlet pipe 34 is bent near the bottom of the heating container 3, and the direction of the water outlet of the water inlet pipe 34, that is, the water outlet direction, is parallel to the bottom of the heating container 3. It can be seen that the original vertical downward water outlet direction is changed to a water outlet direction parallel to the bottom of the heating container 3, so that the water ejected from the water outlet can quickly form a water vortex. Of course, this is not limited to the above, and the following structure can also be adopted: the water inlet pipe 34 is bent near the bottom of the heating container 3, and the direction of the water outlet of the water inlet pipe 34 is set at an acute angle to the bottom of the heating container 3, that is, the water outlet of the water inlet pipe 34 is tilted upward or tilted downward.

[0073] Furthermore, preferably, as shown in FIG. 2 and FIG. 3 , the water inlet pipe 34 is L-shaped near the bottom of the heating container 3 , which has a simple structure and is easy to manufacture.

[0074] In this embodiment, preferably, as shown in FIG1 , the waste water container 7 is disposed below the water storage container 1 .

[0075] According to the structure described above, it can be seen that according to the principle of gravity, the waste water container 7 is arranged below the water storage container 1, which helps to quickly drain water and improve work efficiency.

[0076] In this embodiment, preferably, as shown in Figure 1, the water storage container 1 is arranged below the water storage container 1, mainly for the rationality of the layout. Of course, it is not limited to this. The water storage container 1 is arranged on the side of the heating container 3 or even above it, because it has a water pump 2 to provide conveying power.

[0077] In this embodiment, preferably, as shown in FIG. 1 and FIG. 2 , a water outlet is formed at the top of the water storage container 1 along its height direction.

[0078] According to the structure described above, the water inlet and outlet of the heating container 3 are both arranged at the top of the heating container 3, ensuring that there is enough space in the entire heating container 3 to store water and facilitating subsequent maintenance.

[0079] Furthermore, preferably, the water outlet is provided with a water outlet joint 35 .

[0080] Example 2

[0081] Embodiment 2 of the present application also provides an automatic cleaning method for a boiler automatic drainage cleaning system, which is applied to the boiler automatic drainage cleaning system described in the above embodiment 1. Therefore, it has all the beneficial technical effects of the boiler automatic drainage cleaning system, and the same technical features and beneficial effects are no longer repeated.

[0082] In this embodiment, preferably, as shown in FIG1 to FIG3 , the automatic cleaning method of the boiler automatic drainage cleaning system includes the following steps:

[0083] Step 1: Automatically drain the boiler:

[0084] Step 1-1: Use the three-way solenoid valve 4 to close the water passages formed between the heating container 3 and the coffee preparation component 5 and the waste water container 7, and open the water passage between the coffee preparation component 5 and the waste water container 7 to drain the residual water in the water passages;

[0085] Step 1-2: Start the water pump 2 to pump water from the water storage container 1 into the heating container 3 for pressurization. Then, turn off the water pump 2 and open the solenoid valve 6. The pressure in the heating container 3 will cause the water in the heating container 3 to flow out and enter the waste water container 7 through the solenoid valve 6.

[0086] Step 1-3: When the pipe connecting the solenoid valve 6 and the heating container 3 is filled with water, the three-way solenoid valve 4 is used to open the water passage between the heating container 3 and the coffee preparation component 5 and / or the waste water container 7, thereby connecting the heating container 3 to the outside atmosphere and finally draining all the water from the heating container 3;

[0087] Step 2: Automatic flushing or pressure-maintaining soaking;

[0088] The automatic flushing step includes: when the water in the heating container 3 is emptied, closing the solenoid valve 6, starting the water pump 2, and pumping water from the water storage container 1 into the heating container 3 to flush the interior of the heating container 3;

[0089] The pressure-maintaining soaking step: when the water in the heating container 3 is emptied, the solenoid valve 6 is closed, and the water path between the heating container 3, the coffee preparation component 5, and the waste water container 7 is closed using the three-way solenoid valve 4. Then, a descaling agent is placed in the water storage container 1, and the water pump 2 is started to pump the water mixed with the descaling agent from the water storage container 1 into the heating container 3.

[0090] The steps 1 and 2 can be repeated. It can be seen that the system can realize multiple working modes, for example: cleaning mode: emptying - maintaining pressure and soaking - emptying - flushing - emptying - refilling with water; daily mode: emptying - flushing - emptying - refilling with water; deep cleaning: emptying - maintaining pressure and soaking - emptying - flushing - emptying - flushing - emptying - refilling with water.

[0091] In combination with the above, it can be seen that the boiler automatic drainage and cleaning system provided in this application can realize self-cleaning and drainage of the heating container 3, such as the boiler. It is simple and convenient to operate, does not require manual disassembly and cleaning, and does not require the help of professionals. It is user-friendly and convenient, and saves time and effort, reducing subsequent maintenance costs.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. Industrial Applicability

[0093] The automatic boiler drainage and cleaning system provided in this application can realize self-cleaning and drainage of heating containers such as boilers. It is simple and convenient to operate, does not require manual disassembly and cleaning, and does not require the help of professionals. It is user-friendly and convenient, and saves time and effort, reducing subsequent maintenance costs.

Claims

1. A boiler automatic drainage cleaning system, characterized in that: include: A water storage container, a water pump, a heating container, a three-way solenoid valve, a coffee preparation component, a solenoid valve, and a waste water container; The water storage container, the water pump and the heating container are connected in sequence; the heating container is connected to the coffee preparation component and the waste water container respectively via the three-way solenoid valve; The pipeline communicating between the heating container and the water pump is connected to the waste water container through a pipe fitting and the solenoid valve.

2. The automatic boiler drainage cleaning system according to claim 1, characterized in that: A water inlet is arranged at the top of the water storage container along the height direction thereof, and along the height direction of the water storage container, the solenoid valve is lower than the water inlet.

3. The automatic boiler drainage cleaning system according to claim 2, characterized in that: A water inlet joint is installed at the water inlet, and the water inlet joint forms a water inlet pipe extending to the bottom of the heating container, and the water inlet pipe is set deviated from the center line of the heating container along its height direction, so that the water outlet of the water inlet pipe is set deviated from the center line.

4. The automatic boiler drainage cleaning system according to claim 3, characterized in that: A virtual line is formed between the water outlet of the water inlet pipe and the midpoint of a virtual horizontal plane in the heating container flush with the water outlet, and the directions of the virtual line and the water outlet of the water inlet pipe are at an acute angle or a right angle.

5. The automatic boiler drainage cleaning system according to claim 3, characterized in that: The water inlet pipe is bent near the bottom of the heating container, and the water outlet of the water inlet pipe is parallel to or arranged at an acute angle to the bottom of the heating container.

6. The automatic boiler drainage cleaning system according to claim 5, characterized in that: The water inlet pipe is L-shaped near the bottom of the heating container.

7. The automatic boiler drainage cleaning system according to claim 1, characterized in that: The heating container comprises a container body and a heating tube, and the heating tube is arranged in the container body.

8. The automatic boiler drainage cleaning system according to claim 1, characterized in that: The waste water container is arranged below the water storage container; and / or The water storage container is arranged below the water storage container; and / or The top of the water storage container along the height direction is formed with a water outlet.

9. The automatic boiler drainage cleaning system according to any one of claims 1 to 8, characterized in that: The coffee preparation component is an extraction head or a steam spray head.

10. An automatic cleaning method for a boiler automatic drainage cleaning system, characterized in that: The automatic boiler drainage cleaning system according to any one of claims 1 to 9, wherein the automatic cleaning method of the automatic boiler drainage cleaning system comprises the following steps: Step 1: Automatically drain the boiler: Step 1-1, using the three-way solenoid valve to close the water paths formed between the heating container and the coffee preparation component and the waste water container, and to open the water path between the coffee preparation component and the waste water container, thereby draining the residual water in the water path; Step 1-2, start the water pump to pump water from the water storage container into the heating container for pressurization, then close the water pump and open the solenoid valve, the pressure in the heating container will cause the water in the heating container to flow out and enter the waste water container through the solenoid valve; Step 1-3, when the pipeline connecting the solenoid valve and the heating container is full of water, the three-way solenoid valve is used to open the water path between the heating container and the coffee preparation component and / or the waste water container, so that the heating container is connected to the outside atmosphere, and finally the water in the heating container is completely drained; Step 2: Automatic flushing or pressure-maintaining soaking; The automatic flushing step includes: when the water in the heating container is emptied, closing the solenoid valve, starting the water pump, pumping water from the water storage container into the heating container, and flushing the interior of the heating container; The pressure-maintaining soaking step: when the water in the heating container is emptied, the solenoid valve is closed, and the water path between the heating container, the coffee preparation component and the waste water container is closed by using the three-way solenoid valve, and then the descaling agent is put into the water storage container, and the water pump is started to pump the water mixed with the descaling agent from the water storage container into the heating container; The step 1 and the step 2 may be repeated.

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