CN115486693B - Steam heating automatic cleaning system and method thereof - Google Patents

Abstract

A steam heating automatic cleaning system includes a machine body, a steam boiler, at least one steam pipe, at least one steam nozzle, a control panel, at least one temperature detector and at least one steam solenoid valve. After the beverage cup is filled with beverage, the steam nozzle and the temperature detector can be immersed below the water level of the beverage in the beverage cup, and the steam solenoid valve is opened to output steam to the beverage in the beverage cup, and the temperature detector is used to detect the temperature of the beverage. When the beverage is heated to a default temperature, the steam solenoid valve is closed to complete the beverage heating procedure. In addition, the temperature drop rate sensed by the temperature detector is used to determine whether the beverage cup has left the steam nozzle and the temperature detector. When it is determined that the beverage cup has left the steam nozzle and the temperature detector, the steam solenoid valve can be opened for a period of time so that steam can be output to the outside through the steam pipe and the steam nozzle to discharge the beverage remaining in the steam pipe and the steam nozzle, which can effectively prevent the residual beverage from blocking the steam pipe or the steam nozzle, reduce the failure rate, and be more hygienic.

Description

Steam heating automatic cleaning system and method

Technical Field

The present application relates to a steam heating automatic cleaning system and method, and in particular to a steam heating automatic cleaning system and method which can automatically clean the residual beverage in the steam pipe and the steam nozzle after each beverage heating process is completed.

Background technique

In order to cope with the supply volume during peak hours, beverages in beverage shops are usually prepared in advance and then refrigerated to keep them fresh. When customers order hot beverages, the bar staff will heat them to the default temperature with steam. After the heating is completed, the heated beverage will remain in the steam pipe and the steam nozzle, so the steam valve needs to be started again for a few seconds to rinse out the residual beverage in the steam pipe and the steam nozzle. However, due to the busy business peak hours or the negligence of the staff and the failure to perform the residual beverage cleaning procedure, the steam pipe and the steam nozzle will be contaminated or blocked.

Summary of the invention

The technical problem to be solved by the present application is to provide a steam heating automatic cleaning system and method to address the deficiencies of the prior art. Each time the beverage completes the heating process, the residual beverage is automatically cleaned, effectively preventing the residual beverage from blocking the steam pipe or the steam nozzle, reducing the failure rate, and being more hygienic. The residual beverage can also be cleaned by an automatic control program without increasing the cost of the steam heating machine at all.

In order to solve the above technical problems, the present application provides a steam heating automatic cleaning system, comprising: a machine body; a steam boiler, which is arranged in the machine body; at least one steam pipe, one end of which is connected to the steam boiler; at least one steam nozzle, which is connected to the other end of the steam pipe, and the steam generated by the steam boiler can be output to the outside through the steam pipe and the steam nozzle; a control panel, which is arranged on the machine body, and the steam boiler is electrically connected to the control panel; at least one temperature detector, which is arranged on one side of the steam pipe, and the temperature detector is electrically connected to the control panel; and at least one steam solenoid valve, which can open or close the steam flowing into the machine body. A steam pipe; wherein the steam nozzle and the temperature detector can be immersed below the water level of a beverage in a beverage cup, and the steam solenoid valve is opened to output steam into the beverage in the beverage cup through the steam pipe and the steam nozzle, and the temperature detector is used to detect the beverage temperature. When the beverage is heated to a default temperature, the steam solenoid valve is closed to complete the beverage heating procedure; in addition, the temperature drop rate sensed by the temperature detector can be used to determine whether the beverage cup has left the steam nozzle and the temperature detector. When it is determined that the beverage cup has left the steam nozzle and the temperature detector, the steam solenoid valve can be opened for a period of time so that steam can be output to the outside through the steam pipe and the steam nozzle to discharge the beverage remaining in the steam pipe and the steam nozzle.

Optionally, the steam-heated automatic cleaning system as described in claim 1 is characterized in that the control panel has an automatic key, a manual key and a temperature display, and the default temperature is set by pressing the automatic key.

Optionally, if the temperature drop rate sensed by the temperature detector drops within a limited temperature range within a limited time, it is determined that the beverage cup has left the steam nozzle and the temperature detector.

Optionally, when the beverage heating process is completed, the control panel can send out an audible signal or a light to remind the operator to remove the beverage cup.

Optionally, the steam solenoid valve is provided with two, including a first steam solenoid valve and a second steam solenoid valve, the first steam solenoid valve and the second steam solenoid valve can be opened at the same time, when the heating temperature reaches the default temperature, the first steam solenoid valve is closed, the second steam solenoid valve remains open, and can send out an audible signal or a light to remind the operator to remove the beverage cup, and the second steam solenoid valve is automatically or manually closed after a few seconds.

In order to solve the above-mentioned technical problems, the present application further provides a steam heating automatic cleaning method, comprising the steps of: providing a steam heating automatic cleaning system, comprising a machine body, a steam boiler, at least one steam pipe, at least one steam nozzle, a control panel, at least one temperature detector and at least one steam solenoid valve, the steam boiler is arranged in the machine body, one end of the steam pipe is connected to the steam boiler, the steam nozzle is connected to the other end of the steam pipe, the steam generated by the steam boiler can be output to the outside through the steam pipe and the steam nozzle, the control panel is arranged on the machine body, the steam boiler is electrically connected to the control panel, the temperature detector is arranged on one side of the steam pipe, the temperature detector is electrically connected to the control panel, and the steam solenoid valve can The steam flow into the steam pipe is opened or closed; the steam nozzle and the temperature detector are immersed below the water level of the beverage in a beverage cup, and then the steam solenoid valve is opened to output steam to the beverage in the beverage cup through the steam pipe and the steam nozzle, and the temperature detector is used to detect the beverage temperature. When the beverage is heated to a preset temperature, the steam solenoid valve is closed to complete the beverage heating procedure; and then the temperature drop rate sensed by the temperature detector is used to determine whether the beverage cup has left the steam nozzle and the temperature detector. When the beverage cup has left the steam nozzle and the temperature detector, the steam solenoid valve is opened for a period of time so that the steam can be output to the outside through the steam pipe and the steam nozzle to discharge the beverage remaining in the steam pipe and the steam nozzle.

Optionally, the control panel has an automatic key, a manual key and a temperature display, and the default temperature is set by pressing the automatic key.

Optionally, if the temperature drop rate sensed by the temperature detector falls within a limited temperature range within a limited time, it is determined that the beverage cup has left the steam pipe and the temperature detector.

Optionally, when the beverage heating process is completed, the control panel can send out an audible signal or a light to remind the operator to remove the beverage cup.

Optionally, the steam solenoid valve is provided with two, including a first steam solenoid valve and a second steam solenoid valve. The first steam solenoid valve and the second steam solenoid valve are opened at the same time. When the heating temperature reaches the default temperature, the first steam solenoid valve is closed, and the second steam solenoid valve remains open and can send out an audible signal or a light to remind the operator to remove the beverage cup. After a few seconds, the second steam solenoid valve is automatically or manually closed.

The beneficial effect of the present application is that the steam heating automatic cleaning system and method provided by the present application include a machine body, a steam boiler, a steam pipe, a steam nozzle, a control panel, a temperature detector and a steam solenoid valve. After the beverage cup is filled with beverage, the steam nozzle and the temperature detector can be immersed below the water level of the beverage in the beverage cup, and the steam solenoid valve is opened to output steam to the beverage in the beverage cup, and the temperature detector is used to detect the temperature of the beverage. When the beverage is heated to a default temperature, the steam solenoid valve is closed to complete the beverage heating procedure. In addition, the temperature drop rate sensed by the temperature detector is used to determine whether the beverage cup has left the steam nozzle and the temperature detector. When it is determined that the beverage cup has left the steam nozzle and the temperature detector, the steam solenoid valve is immediately opened for a period of time, so that the steam can be output outward through the steam pipe and the steam nozzle to discharge the beverage remaining in the steam pipe and the steam nozzle, which can effectively prevent the residual beverage from blocking the steam pipe or the steam nozzle, reduce the failure rate, and be more hygienic.

To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the drawings are only provided for reference and illustration and are not intended to limit the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional diagram of the steam-heated automatic cleaning system of the present application.

FIG. 2 is a schematic diagram of the use status of the steam heating automatic cleaning system of the present application.

FIG. 3 is a three-dimensional diagram of a steam-heated automatic cleaning system according to another embodiment of the present application.

FIG. 4 is a schematic diagram of the use status of the steam heating automatic cleaning system according to another embodiment of the present application.

Detailed ways

[First embodiment]

Please refer to Figures 1 and 2. The present application provides a steam heating automatic cleaning system, which is a constant temperature steam heating machine with an automatic cleaning function, including a machine body 1, a steam boiler 2, at least one steam pipe 3, at least one steam nozzle 4, a control panel 5, at least one temperature detector 6 and at least one steam solenoid valve 7.

The steam boiler 2 is disposed in the machine body 1. The steam boiler 2 can heat the water stored therein to generate steam. One end of the steam pipe 3 is connected to the steam boiler 2, and the steam nozzle 4 is connected to the other end of the steam pipe 3. The steam generated by the steam boiler 2 can be output outward through the steam pipe 3 and the steam nozzle 4 in sequence. The steam pipe 3 and the steam nozzle 4 can also be provided with two, three or four or more, respectively, and the number is not limited. In this embodiment, two steam pipes 3 and two steam nozzles 4 are provided. The control panel 5 is disposed on the machine body 1. The steam boiler 2 is electrically connected to the control panel 5. The control panel 5 can be used to control the operation of the steam boiler 2. The control panel 5 can have an automatic key 51, a manual key 52 and a temperature display 53, etc. The control panel 5 includes an automatic control system.

The above-mentioned constant temperature steam heating machine is a common device in the market. This embodiment is equipped with two sets of steam heating devices, each set of heating devices is equipped with a set of control panels 5, each set of control panels 5 has a temperature display 53, which can display the temperature of the beverage when the heating program is executed, and four operation buttons, one of which is a manual button 52, which can be manually operated to heat to the required temperature. When the visual temperature display 53 shows that the temperature reaches the required temperature, press the manual button 52 again to stop heating and complete the manual heating program. The automatic heating button has three automatic buttons 51, but it is not limited to this. The three automatic buttons 51 can set the heating temperature in advance. These automatic buttons 51 set different default temperatures, for example, 50℃, 60℃, 70℃ respectively. When the beverage is heated to the default temperature, the automatic control system automatically closes the steam solenoid valve 7 to complete the heating program.

The temperature detector 6 is disposed on one side of the steam pipe 3 so that the temperature detector 6 can be placed in the beverage cup 10 together with the steam pipe 3. The temperature detector 6 can also extend to one side of the steam nozzle 4, and the temperature detector 6 is electrically connected to the control panel 5. This embodiment can be a single steam solenoid valve type, that is, a steam solenoid valve 7 is disposed between the steam boiler 2 and the steam pipe 3 to open or close the steam flow into the steam pipe 3.

The machine body 1 may have a cup tray 11. After the beverage cup 10 is filled with an appropriate amount of beverage, the beverage cup 10 may be placed on the cup tray 11 or other appropriate position of the machine body 1, so that the steam nozzle 4 and the temperature detector 6 are immersed below the water level of the beverage in the beverage cup 10. For example, the beverage is scheduled to be heated to a default temperature, and the default temperature is, for example, 60°C. The automatic key 51 may be set according to the default temperature of 60°C. The automatic control system opens the steam solenoid valve 7 to output steam to the beverage in the beverage cup 10 through the steam pipe 3 and the steam nozzle 4, and detects the beverage temperature with the temperature detector 6. When the beverage is heated to the default temperature (60°C), the automatic control system closes the steam solenoid valve 7 to complete the beverage heating procedure. At this time, the control surface Panel 5 (automatic control system) can also send out an audible signal or a light to remind the operator to remove the beverage cup 10 when closing the steam solenoid valve 7; because there will be steam noise when heating the beverage with steam, the steam heating program can also be judged whether it is in progress or completed by whether the steam noise continues or stops; if manual heating is used, press the manual key 52, the automatic control system opens the steam solenoid valve 7 to output steam to the beverage in the beverage cup 10 through the steam pipe 3 and the steam nozzle 4, and detects the beverage temperature with the temperature detector 6, the temperature display 53 displays the temperature of the beverage being heated, and the temperature displayed on the visual temperature display 53 is pressed. When the heating reaches the default temperature, press the manual key 52, the automatic control system closes the steam solenoid valve 7, and the beverage heating program is completed.

When the beverage is heated to the default temperature, if the beverage cup 10 is not removed from the temperature detector 6, since the beverage is usually heated to about 300-400cc, the beverage temperature in the beverage cup 10 cools down slowly, usually about 3°C per minute (the cooling rate in summer and winter is slightly different from the geographical location of the beverage store); when the beverage cup 10 leaves the temperature detector 6, the medium in contact with the temperature detector 6 is room temperature air. At this time, the temperature detector 6 senses the air temperature, and the temperature drops by about 1-2°C per second according to the ambient temperature in spring, summer, autumn and winter. Therefore, the temperature drop speed (temperature drop rate) sensed by the temperature detector 6 can be used to determine whether the beverage cup 10 has left the steamer. The steam nozzle 4 and the temperature detector 6, that is, if the temperature drop speed sensed by the temperature detector 6 drops within a limited temperature range within a limited time, it is determined that the beverage cup 10 has left the steam nozzle 4 and the temperature detector 6. For example, if the temperature drop is ≥4°C within any 5-second time interval, the automatic control system determines that the beverage cup 10 has left the steam nozzle 4 and the temperature detector 6, and then opens the steam solenoid valve 7 for a period of time (for example, 3-5 seconds) to allow steam to be output through the steam pipe 3 and the steam nozzle 4 for a period of time and then closes to discharge the beverage remaining in the steam pipe 3 and the steam nozzle 4, thereby achieving the purpose of automatically cleaning the steam pipe 3 or the steam nozzle 4. In addition, the interval of the detection time of the temperature detector 6, the temperature drop speed and the time to open the steam solenoid valve 7 can be set in advance according to actual needs or adjusted flexibly according to actual tests according to factors such as seasonal temperature changes or the geographical location of the beverage store. The steam heating automatic cleaning system of this embodiment can automatically remove the residual beverage after each beverage completes the heating process, which can effectively prevent the residual beverage from blocking the steam pipe 3 or the steam nozzle 4.

[Second embodiment]

Please refer to Figures 3 and 4. This embodiment may be a double steam solenoid valve type, which is provided with two steam solenoid valves, including a first steam solenoid valve 8 and a second steam solenoid valve 9. Preferably, the first steam solenoid valve 8 can set a first flow rate (normal flow rate), and the second steam solenoid valve 9 can set a second flow rate (small flow rate). The second flow rate is less than the first flow rate, but is not limited. For example, the second flow rate may also be greater than or equal to the first flow rate. When the automatic key 51 is pressed, the automatic control system starts the second steam valve 9 to discharge the condensed water in the steam pipe 3 when it is on standby. After a few seconds, the beverage cup 10 is placed so that the steam nozzle 4 and the temperature detector 6 are submerged below the beverage water level. When the temperature detector 6 detects that there is a temperature difference between the beverage and the temperature set by the automatic key 51, the first steam solenoid valve 8 is started. When the heating temperature reaches the default temperature, the automatic control system closes the first steam solenoid valve 8, and the second steam solenoid valve 9 remains open. At this time, the automatic control system can send out an audible signal or a light to remind the operator to remove the beverage cup 10. After the beverage cup 10 is removed, the temperature detector 6 detects that the temperature drops by ≧4°C within a time interval of 5 seconds, for example, and the automatic control system closes the second steam solenoid valve 9. It can also close the second steam solenoid valve 9 after a delay of a few seconds to complete the beverage heating and steam pipe 3 cleaning process. The detection time interval of the temperature detector 6, the temperature drop speed, and the time (in seconds) to open the first steam solenoid valve 8 and the second steam solenoid valve 9 can be set and modified in advance according to actual needs. In this embodiment, the beverage remaining in the steam pipe 3 and the steam nozzle 4 can be discharged at a low flow rate. The advantage is that the low steam flow rate can reduce the diffusion range of the discharged residual beverage, and the steam heater is easier to clean and maintain. In this embodiment, the beverage cup 10 can be directly placed and the automatic key 51 can be pressed to execute the beverage heating program.

Another equivalent embodiment, because of the equivalent procedure, is only briefly described, when the steam is heated, only the first steam solenoid valve 8 is opened, and when the steam heating procedure is completed, the first steam solenoid valve 8 is closed, and the second steam solenoid valve 9 is opened at the same time, and after the beverage cup 10 is removed, the control panel 5 (automatic control system) automatically closes the second steam solenoid valve 9 after a preset number of seconds, completing the steam pipe 3 cleaning procedure. In another equivalent embodiment, after the steam heating procedure is completed, the beverage cup 10 is removed, and the second steam solenoid valve 9 continues to be opened for a few seconds, the operator manually closes the second steam solenoid valve 9, completing the steam pipe 3 cleaning procedure.

Please refer to FIG. 1 to FIG. 4 , the present application further provides a steam heating automatic cleaning method, comprising the following steps:

First, a steam heating automatic cleaning system is provided, comprising a machine body 1, a steam boiler 2, at least one steam pipe 3, at least one steam nozzle 4, a control panel 5, at least one temperature detector 6 and at least one steam solenoid valve 7; since the steam heating automatic cleaning system is the same as the above embodiment, it will not be described in detail;

Then, the steam nozzle 4 and the temperature detector 6 are immersed below the water level of the beverage in the beverage cup 10, and the steam solenoid valve 7 is opened to output steam to the beverage in the beverage cup 10 through the steam pipe 3 and the steam nozzle 4, and the temperature detector 6 detects the temperature of the beverage. When the beverage is heated to a preset temperature, the steam solenoid valve 7 is closed to complete the beverage heating process;

Finally, the temperature drop speed (temperature drop rate) sensed by the temperature detector 6 is used to determine whether the beverage cup 10 has left the steam nozzle 4 and the temperature detector 6. When it is determined that the beverage cup 10 has left the steam nozzle 4 and the temperature detector 6, the steam solenoid valve 7 is opened for a period of time to allow steam to be output through the steam pipe 3 and the steam nozzle 4 to discharge the beverage remaining in the steam pipe 3 and the steam nozzle 4. If the beverage cup 10 has not left the steam pipe 3 and the temperature detector 6, the automatic control system can send out an audible signal or a light to remind the operator to remove the beverage cup 10.

[Beneficial Effects of Embodiments]

The beneficial effect of the present application is that the steam heating automatic cleaning system and method provided by the present application include a machine body, a steam boiler, a steam pipe, a steam nozzle, a control panel, a temperature detector and a steam solenoid valve. After the beverage cup is filled with beverage, the steam nozzle and the temperature detector can be immersed below the water level of the beverage in the beverage cup, and the steam solenoid valve is opened to output steam to the beverage in the beverage cup, and the temperature detector is used to detect the beverage temperature. When the beverage is heated to a default temperature, the steam solenoid valve is closed to complete the beverage heating procedure. In addition, the temperature is detected by the temperature detector, and the temperature drop rate sensed by the temperature detector is used to determine whether the beverage cup has left the steam nozzle and the temperature detector. When it is determined that the beverage cup has left the steam nozzle and the temperature detector, the steam solenoid valve is immediately opened for a period of time, so that the steam can be output outward through the steam pipe and the steam nozzle to discharge the beverage remaining in the steam nozzle and the steam pipe, which can effectively prevent the residual beverage from blocking the steam pipe or the steam nozzle, reduce the failure rate, and be more hygienic. In addition, the detection time interval of the temperature detector, the temperature drop rate and the time to open the steam solenoid valve can also be set in advance according to actual needs or adjusted flexibly according to actual tests based on factors such as seasonal temperature changes and the geographical location of the beverage store.

However, the above description is only an optional embodiment of the present application and is not intended to limit the patent protection scope of the present application. Therefore, all equivalent changes made using the contents of the present application specification and drawings are also included in the scope of protection of the present application and are hereby stated.

Claims (10)

1. A steam heating automatic cleaning system, characterized in that it includes: One organism; a steam boiler disposed in the body; at least one steam pipe, one end of which is connected to the steam boiler; at least one steam nozzle, the steam nozzle being connected to the other end of the steam pipe, and the steam generated by the steam boiler can be output to the outside through the steam pipe and the steam nozzle; a control panel, the control panel being disposed on the machine body, the steam boiler being electrically connected to the control panel; at least one temperature detector, the temperature detector being disposed on one side of the steam pipe and electrically connected to the control panel; and at least one steam solenoid valve capable of opening or closing the flow of steam into the steam pipe; The steam nozzle and the temperature detector can be immersed below the water level of the beverage in a beverage cup, and the steam solenoid valve is opened to output steam into the beverage in the beverage cup through the steam pipe and the steam nozzle, and the temperature detector is used to detect the temperature of the beverage. When the beverage is heated to a default temperature, the steam solenoid valve is closed to complete the beverage heating procedure; in addition, the temperature drop rate sensed by the temperature detector can be used to determine whether the beverage cup has left the steam nozzle and the temperature detector. When it is determined that the beverage cup has left the steam nozzle and the temperature detector, the steam solenoid valve can be opened for a period of time so that the steam can be output to the outside through the steam pipe and the steam nozzle to discharge the beverage remaining in the steam pipe and the steam nozzle. 2. The steam-heated automatic cleaning system as described in claim 1 is characterized in that the control panel has an automatic key, a manual key and a temperature display, and the default temperature is set by pressing the automatic key. 3. The steam-heated automatic cleaning system as claimed in claim 1, wherein if the temperature drop rate sensed by the temperature detector drops within a specified temperature range within a specified time, it is determined that the beverage cup has left the steam nozzle and the temperature detector. 4. The steam heating automatic cleaning system as claimed in claim 1, characterized in that when the beverage heating process is completed, the control panel can send out an audible signal or a light to remind the operator to remove the beverage cup. 5. The steam heating automatic cleaning system as described in claim 1 is characterized in that the steam solenoid valve is provided with two, including a first steam solenoid valve and a second steam solenoid valve, the first steam solenoid valve and the second steam solenoid valve can be opened at the same time, when the heating temperature reaches the default temperature, the first steam solenoid valve is closed, and the second steam solenoid valve remains open and can send out an audible signal or a light to remind the operator to remove the beverage cup, and the second steam solenoid valve is automatically or manually closed after a few seconds. 6. A steam heating automatic cleaning method, characterized in that it comprises the steps of: Provided is a steam heating automatic cleaning system, comprising a machine body, a steam boiler, at least one steam pipe, at least one steam nozzle, a control panel, at least one temperature detector and at least one steam solenoid valve, wherein the steam boiler is arranged in the machine body, one end of the steam pipe is connected to the steam boiler, the steam nozzle is connected to the other end of the steam pipe, the steam generated by the steam boiler can be output to the outside through the steam pipe and the steam nozzle, the control panel is arranged on the machine body, the steam boiler is electrically connected to the control panel, the temperature detector is arranged on one side of the steam pipe, the temperature detector is electrically connected to the control panel, and the steam solenoid valve can open or close the steam flowing into the steam pipe; The steam nozzle and the temperature detector are immersed below the water level of the beverage in a beverage cup, and then the steam solenoid valve is opened to output steam to the beverage in the beverage cup through the steam pipe and the steam nozzle, and the temperature detector is used to detect the temperature of the beverage. When the beverage is heated to a preset temperature, the steam solenoid valve is closed to complete the beverage heating procedure; The temperature drop rate sensed by the temperature detector is then used to determine whether the beverage cup has left the steam nozzle and the temperature detector. When it is determined that the beverage cup has left the steam nozzle and the temperature detector, the steam solenoid valve is opened for a period of time to allow steam to be output to the outside through the steam pipe and the steam nozzle to discharge the beverage remaining in the steam pipe and the steam nozzle. 7. The steam-heated automatic cleaning method as claimed in claim 6 is characterized in that the control panel has an automatic key, a manual key and a temperature display, and the default temperature is set by pressing the automatic key. 8. The steam-heated automatic cleaning method of claim 6, wherein if the temperature drop rate sensed by the temperature detector drops within a specified temperature range within a specified time, it is determined that the beverage cup has left the steam pipe and the temperature detector. 9. The steam-heated automatic cleaning method of claim 6, wherein when the beverage heating process is completed, the control panel can emit an audible signal or a light to remind the operator to remove the beverage cup. 10. The steam-heated automatic cleaning method as described in claim 6 is characterized in that the steam solenoid valve is provided with two, including a first steam solenoid valve and a second steam solenoid valve, the first steam solenoid valve and the second steam solenoid valve are opened at the same time, when the heating temperature reaches the default temperature, the first steam solenoid valve is closed, and the second steam solenoid valve remains open and can send out an audible signal or a light to remind the operator to remove the beverage cup, and the second steam solenoid valve is automatically or manually closed after a few seconds.