Combined heat and power system and method for controlling the same

Abstract

The application discloses a combined supply system and a control method thereof. The combined supply system comprises a cleaning machine and a hot water device. The cleaning machine is provided with a water inlet. The hot water device is provided with a water inlet and a water outlet. The water inlet and the water outlet of the hot water device are connected with the water inlet of the cleaning machine through a combined supply pipeline. The combined supply system further comprises a switching device and a water pump, and a controller capable of being in communication connection with the cleaning machine, the hot water device, the water pump and the switching device. The switching device comprises a first state and a second state. When the switching device is in the first state, the hot water device can cooperate with at least part of the combined supply pipeline to form a first circulating water path. When the switching device is in the second state, the water outlet of the hot water device is connected with the water inlet of the cleaning machine, and the hot water device supplies water to the cleaning machine. The application can make the cleaning machine achieve a better cleaning effect, shorten the total cleaning time and improve the user experience.

Description

Technical Field

[0001] This invention relates to the field of various electrical appliance interconnection technologies, and in particular to a combined power supply system and its control method. Background Technology

[0002] A dishwasher is a device used to automatically clean dishes. Because washing dishes with a dishwasher greatly reduces tedious manual labor, is easy to operate, and has a high degree of automation, it has become increasingly popular among consumers.

[0003] Currently, dishwashers use either room temperature tap water or heated water for washing. After comparing the cleaning effects under different water temperatures, the applicant found that within a certain temperature range, the cleaning effect of a dishwasher is positively correlated with the water temperature. Generally, washing with room temperature tap water is less effective than washing with heated water.

[0004] To ensure optimal cleaning performance, the water used for washing can be heated to a certain temperature. However, the applicant discovered the following problem:

[0005] Using the existing dishwasher's built-in heating function to heat the water to be washed will prolong the dishwasher's washing time.

[0006] If an external heat source is used to directly supply hot water to the dishwasher, the dishwasher requires approximately 3 liters of water per wash cycle. With a water flow rate of 2.5 L / min, the water intake time is typically around 1 minute. During this short time, the water reaching the dishwasher is usually cold water from the pipes between the heat source and the dishwasher, while most or all of the hot water supplied by the hot water unit has not yet reached the dishwasher. This results in the water temperature for washing not being substantially increased, and consequently, the cleaning effect not being substantially improved. Summary of the Invention

[0007] To overcome at least one of the shortcomings of the prior art, the present invention provides a combined power supply system that can ensure the cleaning machine has a better cleaning effect in a shorter cleaning time and improve the user experience.

[0008] The specific technical solution of the embodiments of the present invention is as follows:

[0009] A combined water supply system includes: a cleaning machine and a hot water device; the cleaning machine has a water inlet; the hot water device has a water inlet and a water outlet; the water inlet and outlet of the hot water device are connected to the water inlet of the cleaning machine via a combined water supply pipeline; the combined water supply system further includes a switching device and a water pump, as well as a controller capable of communicatively connecting to the cleaning machine, the hot water device, the water pump, and the switching device; the switching device includes a first state and a second state; when the switching device is in the first state, the hot water device can cooperate with at least a portion of the combined water supply pipeline to form a first circulating water path; when the switching device is in the second state, the water outlet of the hot water device is connected to the water inlet of the cleaning machine, and the hot water device supplies water to the cleaning machine.

[0010] In a preferred embodiment, the water inlet can also be connected to the return water pipe, and the water outlet can also be connected to the hot water pipe. The hot water device can cooperate with the return water pipe and the hot water pipe to form a second circulating water circuit.

[0011] In a preferred embodiment, the combined supply pipeline and the return water pipeline share a portion near the inlet, and the combined supply pipeline and the hot water pipeline share a portion near the outlet.

[0012] In a preferred embodiment, the return water pipeline is a cold water pipeline connected to the water inlet.

[0013] In a preferred embodiment, the switching device includes any one or a combination of the following: a switching valve, or a combination of at least two valves.

[0014] In a preferred embodiment, the switching device is disposed inside the cleaning machine, or the switching device is distributed in the cleaning machine and the combined power supply pipeline, or the switching device is disposed in the combined power supply pipeline.

[0015] In a preferred embodiment, the switching device is a three-way switching valve, which includes a first interface, a second interface, and a third interface. The first interface and the second interface are respectively connected to the combined power supply pipeline, and the third interface is connected to the water inlet. When the three-way switching valve is in the first state, the first interface and the second interface are connected, and the hot water device cooperates with the combined power supply pipeline to form the first circulating water circuit. When the three-way switching valve is in the second state, the second interface and the third interface are connected, and the water outlet of the hot water device is connected to the water inlet of the cleaning machine.

[0016] In a preferred embodiment, the combined supply pipeline includes a first pipe section and a second pipe section. One end of the first pipe section is connected to the hot water pipeline, and the other end is connected to the second interface. One end of the second pipe section is connected to the return water pipeline, and the other end is connected to the first interface.

[0017] In a preferred embodiment, the water pump is located in any of the following locations: in the hot water device, in the cleaning device, or in the combined power supply pipeline.

[0018] In a preferred embodiment, the combined power supply system further includes a first temperature sensor for detecting the water temperature in the first circulating water circuit. When the temperature detected by the first temperature sensor reaches the target water temperature, the switching device switches from the first state to the second state.

[0019] In a preferred embodiment, the first temperature sensor is disposed at at least one of the following locations: at the inlet of the hot water device, or in the switching device.

[0020] In a preferred embodiment, the cleaning machine is equipped with a water cup, a second temperature sensor for detecting the water temperature in the water cup, and a heating unit. When the temperature detected by the second temperature sensor is lower than the set cleaning temperature, the heating unit can heat the water in the water cup to the set cleaning temperature.

[0021] In a preferred embodiment, the combined power supply system is further provided with a flow detection device for detecting the amount of water entering the cleaning machine, and a washing pump connected to the water cup. After the flow signal detected by the flow detection device indicates that the amount of water entering the cleaning machine has reached a preset amount, the washing pump is started.

[0022] In a preferred embodiment, the cleaning machine is provided with a drain outlet, a water cup, and a second temperature sensor for detecting the water temperature in the water cup. The drain outlet is connected to the water cup. When the temperature detected by the second temperature sensor is lower than the set cleaning temperature, the water supplied by the hot water device is discharged through the drain outlet.

[0023] In a preferred embodiment, the cleaning machine is equipped with a water softening module; and / or, the hot water device is equipped with a water softening module; and / or, the combined power supply system is equipped with a water softening module, which is installed in the combined power supply pipeline.

[0024] In a preferred embodiment, the controller is located in the cleaning machine; or, the controller is located in the hot water device; or, the controller is independently located; or, the controller is located in the cloud, and the hot water device and the cleaning machine are equipped with a communication module.

[0025] In a preferred embodiment, the switching device is disposed in the cleaning machine and controlled by the cleaning machine, and the water pump is disposed in the hot water device and controlled by the hot water device.

[0026] A control method based on the above-mentioned combined heat and power system, the control method comprising:

[0027] Identify water demand signals;

[0028] Upon receiving the water demand signal, the switching device is controlled to be in the first state and the water pump is in the working state, and the hot water device and the combined supply pipeline cooperate to form the first circulating water circuit;

[0029] Obtain the water temperature in the first circulating water path and compare the water temperature with the target water temperature;

[0030] When the water temperature in the first circulating water circuit reaches the target water temperature, the switching device is switched from the first state to the second state, and the hot water device supplies water to the cleaning machine.

[0031] A control method based on the above-mentioned combined heat and power system, the control method comprising:

[0032] The controller identifies water demand signals.

[0033] After receiving the water demand signal, the controller determines the current working status of the hot water device. When the hot water device is in the standby water supply state, it controls the switching device to be in the first state and the water pump to be in the working state. The hot water device and the combined supply pipeline cooperate to form the first circulating water circuit.

[0034] The water temperature in the first circulating water path is obtained, and the obtained water temperature is compared with the target water temperature;

[0035] When the water temperature in the first circulating water circuit reaches the target water temperature, the switching device is switched from the first state to the second state, and the hot water device supplies water to the cleaning machine.

[0036] In a preferred embodiment, the hot water device includes an instantaneous water heater and a storage water heater.

[0037] When the hot water device is an instantaneous water heater, the hot water device being in a standby state includes: the heating unit of the hot water device being in a non-working state;

[0038] When the hot water device is a storage-type water heater, the hot water device being in a standby state includes: the water temperature stored in the hot water device reaching the target water temperature.

[0039] In a preferred embodiment, the cleaning machine is equipped with a washing pump, and the control method further includes: obtaining the amount of water entering the cleaning machine, and starting the washing pump of the cleaning machine after the amount of water entering reaches a preset amount.

[0040] In a preferred embodiment, the cleaning machine is equipped with a washing pump, and the control method further includes: acquiring the inflow rate of water entering the cleaning machine and the water temperature supplied to the cleaning machine;

[0041] Once the incoming water volume reaches the preset water volume and the water temperature reaches the preset cleaning temperature, the washing pump of the cleaning machine is started.

[0042] In a preferred embodiment, the combined power supply system is further provided with a heating unit, which is activated when the obtained water temperature is lower than the set cleaning temperature.

[0043] In a preferred embodiment, the control method further includes:

[0044] Determine whether the water intake of the cleaning machine has ended;

[0045] When the water inlet reaches the preset water volume, the switching device is controlled to switch to the third state. When the switching device is in the third state, the outlet of the hot water device is not connected to the inlet of the cleaning machine, and the first circulating water circuit is disconnected.

[0046] In a preferred embodiment, the water demand signal includes any one or a combination of the following: the target water temperature, the water quality required for cleaning.

[0047] In a preferred embodiment, when the water demand signal includes the water quality required for cleaning, the control method further includes: controlling the water flow path into the inlet of the hot water device based on the water demand signal.

[0048] In a preferred embodiment, the combined water supply system is equipped with a water softening module. When the water demand signal indicates that the water quality requirement is soft water, the water is controlled to flow through the water softening module before entering the inlet of the hot water device.

[0049] In a preferred embodiment, controlling the switching device to be in the first state includes: determining the current state of the switching device, and when the switching device is not in the first state, switching the switching device to the first state.

[0050] The technical solution of the present invention has the following significant beneficial effects:

[0051] The combined water supply system provided in this application mainly includes a cleaning machine, a hot water device, a switching device, a water pump, and a controller. When the switching device is in a first state, the hot water device cooperates with the combined water supply pipeline to form a first circulating water path. After the hot water device and water pump are started, the water in the first circulating water path can be heated to a predetermined temperature by the hot water device under the drive of the water pump. Subsequently, when the cleaning machine needs to be started for cleaning work, the state of the switching device can be switched from the first state to the second state. The switching device connects the outlet of the hot water device to the inlet of the cleaning machine, so that the hot water device can supply water with a predetermined temperature to the cleaning machine. Since the hot water device can cooperate with at least part of the combined water supply pipeline to form a first circulating water path before supplying water to the cleaning machine, the heating function of the hot water device increases the water temperature in the pipeline. The water heated by the hot water device can enter the cleaning machine through part of the first circulating water path, which is equivalent to shortening the length of the cold water section between the hot water device and the cleaning machine, increasing the water temperature supplied to the cleaning machine, thereby ensuring that the cleaning machine has a better cleaning effect in a shorter cleaning time.

[0052] Specific embodiments of the invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Within the spirit and scope of the appended claims, embodiments of the invention include many changes, modifications, and equivalents. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0053] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0054] Figure 1 This is a schematic diagram of the structure of the first combined heat and power system provided in the embodiments of this application;

[0055] Figure 2 This is a schematic diagram of the structure of the second combined heat and power system provided in the embodiments of this application;

[0056] Figure 3 This is a schematic diagram of the structure of the third combined heat and power system provided in the embodiments of this application;

[0057] Figure 4This is a schematic diagram of the structure of the fourth combined heat and power system provided in the embodiments of this application;

[0058] Figure 5 This is a flowchart of the steps of a control method for a combined heat and power system provided in the embodiments of this application;

[0059] Figure 6 This is a flowchart of the steps of a control method for a combined heat and power system provided in the embodiments of this application;

[0060] Figure 7 This is a logic block diagram of a control method for a combined heat and power (CHP) system provided in the embodiments of this application.

[0061] The reference numerals in the above figures are as follows:

[0062] 1. Washing machine; 10. Water inlet; 11. Water cup; 12. Washing pump; 13. Drain outlet; 14. Drain pump; 15. Spray arm;

[0063] 2. Hot water device; 21. Inlet; 22. Outlet; 23. Return water pipe; 24. Hot water pipe; 25. Constant pressure return water valve;

[0064] 31. First pipe section; 32. Second pipe section; 310. First tee fitting; 320. Second tee fitting;

[0065] 30. Three-way switching valve; 301. First port; 302. Second port; 303. Third port;

[0066] 35. Inlet valve;

[0067] 36. Preheating valve;

[0068] 4. Water pump;

[0069] 51. First temperature sensor;

[0070] 52. Second temperature sensor;

[0071] 53. Flow detection components;

[0072] 6. Soft water module;

[0073] 7. Water source. Detailed Implementation

[0074] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

[0075] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0077] This invention provides a combined power supply system that can ensure the cleaning machine has a better cleaning effect, shorten the total cleaning time, and improve the user experience.

[0078] Please refer to the following for comprehensive information. Figures 1 to 4 This application specification provides a combined heat and power system, which mainly includes a cleaning machine 1 and a hot water device 2. The cleaning machine 1 and the hot water device 2 are connected by pipelines.

[0079] The cleaning machine 1 can specifically be a dishwasher, used to clean tableware, kitchen utensils, and other items. Tableware can include bowls, plates, dishes, chopsticks, etc., and kitchen utensils can include pots, pans, etc. In addition, the cleaning machine 1 can also be used to clean other types of items; for example, when the cleaning machine 1 is used to clean clothes, it can correspond to a washing machine. In the embodiments described in this specification, the cleaning machine 1 is mainly described with reference to a dishwasher. Other similar application scenarios can be referred to in this specification, and will not be described in detail here.

[0080] The washing machine 1 is equipped with a water inlet 10, through which externally supplied water is introduced into the washing machine 1, providing washing water. Generally, the washing machine 1 also includes a water cup 11, a washing pump 12, a spray arm 15, a drain pump 14, and a drain outlet 13. The washing machine 1 typically includes multiple washing modes, such as a pre-wash mode, a powerful wash mode, and an energy-saving wash mode. When the washing machine 1 enters a certain washing mode, a predetermined amount of water is supplied to the water cup 11 through the water inlet 10; the washing pump 12 is then activated, driving the water from the water cup 11 to the spray arm 15, which then sprays the water onto the object being washed, thus cleaning the object. The washed water is collected back into the water cup 11 under gravity and reused. After a washing mode is completed, the drain pump 14 is activated to extract the water from the water cup 11, which is then discharged through the drain outlet 13.

[0081] The hot water device 2 can be any device capable of outputting hot water. Specifically, the hot water device 2 can be any of the following: gas water heater, wall-hung boiler, heat pump water heater, electric water heater, solar water heater, etc. Of course, the specific form of the hot water device 2 is not excluded from other forms in the prior art, and this application does not make specific limitations here. In the embodiments of this specification, the hot water device 2 is mainly described using a gas water heater as an example. Other similar application scenarios can be referred to this specification, and this application will not elaborate on them one by one here.

[0082] The hot water device 2 is provided with an inlet 21 and an outlet 22. The inlet 21 and outlet 22 are used to connect with external water sources 7, water supply terminals, etc. through pipes.

[0083] Please refer to the following: Figures 1 to 4 In some embodiments, the inlet 21 and outlet 22 of the hot water device 2 are connected to the inlet 10 of the cleaning machine 1 via a combined supply pipeline. Correspondingly, the combined supply system may also include a switching device and a water pump 4, as well as a controller communicatively connected to the cleaning machine 1, the hot water device 2, the water pump 4, and the switching device. The switching device includes a first state and a second state. When the switching device is in the first state, the hot water device 2 can cooperate with at least a portion of the combined supply pipeline to form a first circulating water path; when the switching device is in the second state, the outlet 22 of the hot water device 2 is connected to the inlet 10 of the cleaning machine 1, and the hot water device 2 supplies water to the cleaning machine 1.

[0084] When the switching device is in the first state, the hot water device 2 cooperates with the combined supply pipeline to form a first circulating water path. After the hot water device 2 and the water pump 4 are started, the water in the first circulating water path can be heated to a predetermined temperature by the hot water device 2 under the drive of the water pump 4. Subsequently, when the cleaning machine 1 needs to be started for cleaning work, the state of the switching device can be switched from the first state to the second state. The switching device connects the outlet 22 of the hot water device 2 to the inlet 10 of the cleaning machine 1, so that the hot water device 2 can supply water with a predetermined temperature to the cleaning machine 1. Since the hot water device 2 can cooperate with at least part of the combined supply pipeline to form a first circulating water path before supplying water to the cleaning machine 1, the heating function of the hot water device 2 increases the water temperature in the pipeline. The water heated by the hot water device 2 can enter the cleaning machine 1 through part of the first circulating water path, which is equivalent to shortening the length of the cold water section between the hot water device 2 and the cleaning machine 1, increasing the water temperature supplied to the cleaning machine 1, thereby ensuring that the cleaning machine 1 has a better cleaning effect in a shorter cleaning time.

[0085] The predetermined temperature that the water in the first circulating water circuit needs to reach can be set by the user (i.e., the predetermined temperature is the target water temperature set by the user).

[0086] Alternatively, the predetermined temperature can be a temperature set separately based on the cleaning water temperature required by the cleaning machine 1. This predetermined temperature can be set at the factory and stored in the controller.

[0087] Alternatively, the predetermined temperature can be a temperature determined based on the required cleaning water temperature of the cleaning machine 1 and the heat loss of the pipeline between the hot water device 2 and the cleaning machine 1. When the predetermined temperature is a temperature determined based on the required cleaning water temperature of the cleaning machine 1 and the heat loss of the pipeline between the hot water device 2 and the cleaning machine 1, the predetermined temperature is the sum of the cleaning water temperature and the temperature difference due to pipeline loss.

[0088] The water pump 4 is used to provide driving force for the water flow. The water pump 4 can be installed at any location in the first circulating water path. Specifically, the water pump 4 can be integrated into the hot water device 2, installed in the combined water supply pipeline, or installed in the cleaning machine. For example, when the hot water device 2 is a zero-cold-water type water heater, it already has a built-in water pump 4, which can be used without the need for an additional pump.

[0089] The switching device has multiple different states. When the switching device switches between different states, it can be used to change the connection relationship between the pipes. By changing the connection relationship between the pipes, it can be used to switch the connection relationship between the inlet 21 and outlet 22 of the hot water device 2 and the inlet 10 of the cleaning machine 1.

[0090] The controller can communicate with the cleaning machine 1, the hot water unit 2, the water pump 4, and the switching device. Based on the acquired signals, the controller can directly or indirectly control various components in the combined heat and power system. Specifically, the controller can be located in the cleaning machine 1; or, the controller can be located in the hot water unit 2; or, the controller can be set up independently; or, the controller can be located in the cloud, with the hot water unit 2 and the cleaning machine 1 equipped with a communication module.

[0091] When the controller is installed in the cleaning machine 1, it can be integrated into the controller of the cleaning machine 1 itself, such as on the control chip of the cleaning machine 1. The controller can communicate with the hot water device 2 via wired or wireless means. For example, when the controller communicates with the hot water device 2 wirelessly, the hot water device 2 can be equipped with a communication module to communicate with the controller, thereby receiving control signals from the controller or sending feedback on the current status signal of the hot water device 2 to the controller.

[0092] When the controller is installed in the hot water device 2, it can be integrated into the controller of the hot water device 2 itself, such as on the control chip of the hot water device 2. The controller can communicate with the cleaning machine 1 via wired or wireless means. For example, when the controller communicates with the cleaning machine 1 wirelessly, the cleaning machine 1 can be equipped with a communication module to communicate with the controller, thereby receiving control signals from the controller or sending feedback on the current status signal of the cleaning machine 1 to the controller.

[0093] When the controller is set up independently, it can establish communication connections with the cleaning machine 1 and the hot water device 2 via wired or wireless means, respectively. For example, the controller can be a PLC controller independently set up with the cleaning machine 1 and the hot water device 2. Of course, the specific form of the controller is not limited to the example above, and this application does not make specific limitations here. In addition, the installation location of the controller can be flexibly set according to the user's installation environment, and this application does not make specific limitations here either.

[0094] When the controller is set in the cloud, the cloud can store the control program that controls the operation of the hot water device 2 and the cleaning machine 1. The hot water device 2 and the cleaning machine 1 are equipped with a communication module. Using the communication module, the hot water device 2 and the cleaning machine 1 can establish a communication connection with the controller located in the cloud, thereby receiving control signals sent by the cloud controller or feeding back the current status signal to the cloud controller.

[0095] In some implementations, for a hot water device 2 that has a built-in zero cold water function, the inlet 21 of the hot water device 2 can also be connected to the return water pipe 23, and the outlet 22 can also be connected to the hot water pipe 24. The hot water device 2 can cooperate with the return water pipe 23 and the hot water pipe 24 to form a second circulating water circuit.

[0096] When the hot water device 2, in conjunction with the return water pipe 23 and the hot water pipe 24, forms a second circulating water circuit, the hot water device 2 itself has a zero-cold-water function. When a user turns on the water terminal, the hot water device 2 with the zero-cold-water function can immediately provide the user with water at a suitable temperature without having to drain the cold water section in the pipe.

[0097] Specifically, for a hot water device 2 with built-in zero-cold-water function, in addition to a heating module, it is generally equipped with a water pump 4. When the water pump 4 is turned on, it can provide driving force for the water flow in the second circulation water circuit. When the water in the second circulation water circuit flows through the heating module of the hot water device 2, it can be heated, thereby maintaining the water in the second circulation water circuit at a predetermined temperature or above.

[0098] For example, when the user is not using the hot water device 2 with zero cold water function, the return water pipe 23 and the hot water pipe 24 can be connected by the constant pressure return water valve 25. Driven by the water pump 4, the water in the second circulation water circuit circulates in the hot water pipe 24, the return water pipe 23, and the hot water device 2. When it flows through the heating module, it is heated by the heating module until it reaches a suitable water temperature. In addition to controlling the opening and closing of the second circulation water circuit by setting the constant pressure return water valve 25, the second circulation water circuit can also be opened and closed by other control valves. In this specification, the constant pressure return water valve 25 is mainly used as an example for illustration. The situation of other control valves can be compared by analogy. This application will not describe them in detail here.

[0099] In this embodiment, the second circulating water path and the first circulating water path of the combined power supply system can be connected simultaneously, or one of them can be connected selectively.

[0100] For example, when the second circulating water path is in the conducting state, if the user does not need to use the cleaning machine 1, that is, when no water demand signal is detected on the side of the cleaning machine 1, the first circulating water path is in the non-conducting state.

[0101] If a user needs to use the cleaning machine 1, i.e., the water demand signal on the side of the cleaning machine 1 is detected, the first circulating water path can also be activated through the switching device. Generally, since the pipe resistance of the first circulating water path is less than that of the second circulating water path, most of the water will automatically flow into the first circulating pipe.

[0102] When the second circulating water circuit is active, if a user needs to use the cleaning machine 1 (i.e., a water demand signal is detected on the cleaning machine 1 side), the constant pressure return valve 25 can be controlled to be in the off state, making the second circulating water circuit non-conductive, and the first circulating water circuit can be activated through the switching device. Furthermore, when other water terminals need to use hot water, and the cleaning machine 1 side does not need to use it, both the first and second circulating water circuits can be deactivated.

[0103] Furthermore, the combined supply pipeline and the return water pipeline 23 share a portion near the water inlet 21, and the combined supply pipeline and the hot water pipeline 24 share a portion near the water outlet 22.

[0104] When the hot water device 2 itself is a hot water device 2 with zero cold water function, the return water pipe 23 can be a cold water pipe connected to the water inlet 21. In addition, a water source 7 (tap water access point) can be connected to the cold water pipe, and when the user needs water, the water source 7 can be connected to supply water to the hot water device 2.

[0105] For the hot water device 2 with its own zero-cold-water function, the hot water device 2 can cooperate with the return water pipe 23 and the hot water pipe 24 to form a second circulating water circuit. When the hot water device 2 cooperates with the combined supply pipe to form a first circulating water circuit, the combined supply pipe can borrow part of the return water pipe 23 and the hot water pipe 24.

[0106] Specifically, a first tee connector 310 can be installed in the hot water pipe 24, and a second tee connector 320 can be installed in the return water pipe 23. When the inlet 21 and outlet 22 of the hot water device 2 are connected to the inlet 10 of the cleaning machine 1 through the combined supply pipeline, one end of one pipe can be connected to the first tee connector 310 and the other end to the switching device; and one end of another pipe can be connected to the second tee connector 320 and the other end to the switching device. Furthermore, the specific setup and connection of this combined supply pipeline can vary depending on the type and installation location of the switching device.

[0107] In some embodiments, the switching device may include any one or a combination of the following: a switching valve, or a combination of at least two valves. That is, the switching device may be an integrated structure, or it may be a combination of multiple valves.

[0108] The location of the switching device can vary depending on its specific form and the composition of the components inside the cleaning machine 1. Specifically, the switching device can be installed inside the cleaning machine 1, or it can be distributed between the cleaning machine 1 and the combined power supply pipeline, or it can be installed within the combined power supply pipeline.

[0109] When the switching device is installed inside the cleaning machine 1, that is, when the cleaning machine 1 has a switching device inside, the switching device can utilize the switching device inside the cleaning machine 1 without the need for additional installation. For example, the switching device can be installed at a switching valve near the water inlet 10 of the cleaning machine 1.

[0110] The switching device can also be installed in the combined supply pipeline. When the switching device is installed in the combined supply pipeline, it is located close to the water inlet 10 of the cleaning machine 1, so as to shorten the pipeline length between the switching device and the cleaning machine 1 as much as possible, and ensure that when the hot water device 2 supplies the circulating heated water to the cleaning machine 1, the length of the cold water section between the hot water device 2 and the cleaning machine 1 is short.

[0111] In addition, the switching device can also be distributed in the cleaning machine 1 and the combined power supply pipeline, that is, part of it is located in the cleaning machine 1 and the other part is located in the combined power supply pipeline.

[0112] like Figure 1 or Figure 2 As shown, in a specific embodiment, when the switching device is in the form of a switching valve, the switching device can specifically be a three-way switching valve 30. The three-way switching valve 30 includes a first interface 301, a second interface 302, and a third interface 303. The first interface 301 and the second interface 302 are respectively connected to the combined power supply pipeline, and the third interface 303 is connected to the water inlet 10. When the three-way switching valve 30 is in the first state, the first interface 301 and the second interface 302 are connected, and the hot water device 2 cooperates with the combined power supply pipeline to form the first circulating water circuit. When the three-way switching valve 30 is in the second state, the second interface 302 and the third interface 303 are connected, and the water outlet 22 of the hot water device 2 is connected to the water inlet 10 of the cleaning machine 1.

[0113] In this embodiment, when the switching device is a three-way switching valve 30, the three-way switching valve 30 can specifically be a steplessly adjustable electric water valve. Of course, the three-way switching valve 30 can also be other types of valves, and this application does not specifically limit the form of the three-way switching valve 30. Taking an electric water valve as an example, the three-way switching valve 30 can be provided with a valve body and a valve core. The first interface 301, the second interface 302, and the third interface 303 are provided on the valve body. By rotating the valve core, the interfaces and the communication relationship between the interfaces can be changed.

[0114] The three-way switching valve 30 can communicate with the controller and adaptively change the position of the valve core according to the control signal issued by the controller. When the valve core is in the first position, the first interface 301 and the second interface 302 are connected, and the hot water device 2 and at least part of the combined supply pipeline can cooperate to form a first circulating water circuit. The water in the first circulating water circuit can be repeatedly heated when flowing through the heating module of the hot water device 2. When the valve core is in the second position, the second interface 302 is connected to the third interface 303, and the outlet 22 of the hot water device 2 is connected to the inlet 10 of the cleaning machine 1. The water heated to a predetermined temperature in the first circulating water circuit formed in the first state can be guided to the cleaning machine 1.

[0115] In the embodiments described in the specification, when the form and location of the switching device are different, the specific composition and connection of the combined power supply pipeline can also be adapted accordingly.

[0116] like Figure 1 or Figure 2 As shown, when the switching device is a switching valve, the combined supply pipeline may include a first pipe section 31 and a second pipe section 32. One end of the first pipe section 31 is connected to the hot water pipeline 24, and the other end is connected to the second interface 302. One end of the second pipe section 32 is connected to the return water pipeline 23, and the other end is connected to the first interface 301.

[0117] like Figure 1 As shown, when the switching valve is installed inside the cleaning machine 1, the combined supply pipeline may include a first pipe section 31 and a second pipe section 32. A first tee connector 310 may be installed in the hot water pipeline 24, through which one end of the first pipe section 31 can be connected to the hot water pipeline 24; the other end of the first pipe section 31 can be connected to the second interface 302 of the switching valve. A second tee connector 320 may be installed in the return water pipeline 23, through which one end of the second pipe section 32 can be connected to the return water pipeline 23; the other end of the second pipe section 32 can be connected to the first interface 301 of the switching valve.

[0118] like Figure 2 As shown, when the switching valve is located outside the cleaning machine 1, the combined power supply pipeline may include a first pipe section 31 and a second pipe section 32. (Refer to...) Figure 1As shown, a first tee connector 310 can be installed in the hot water pipe 24. One end of the first pipe section 31 can be connected to the hot water pipe 24 through the first tee connector 310; the other end of the first pipe section 31 can be connected to the second interface 302 of the switching valve. A second tee connector 320 can be installed in the return water pipe 23. One end of the second pipe section 32 can be connected to the return water pipe 23 through the second tee connector 320; the other end of the second pipe section 32 can be connected to the first interface 301 of the switching valve.

[0119] Furthermore, the combined power supply pipeline may also include a third pipe section, which is disposed between the third port 303 of the switching valve and the cleaning machine 1. The length of the third pipe section can be determined according to the distance from the switching valve to the cleaning machine 1, and this application does not impose a specific limitation. Theoretically, when the third port 303 of the switching valve is directly connected to the cleaning machine 1, the third pipe section can also be omitted.

[0120] like Figure 3 or Figure 4 As shown, in one specific embodiment, when the switching device is a combination of two valves, it may include a first valve and a second valve. The first valve may be an inlet valve 35, used to control the connection between the cleaning machine 1 and the external water supply. The second valve may be a preheating valve 36, used to control the on / off connection of the first circulating water path. The inlet valve 35 may be a two-position, two-way valve, and the preheating valve 36 may also be a two-position, two-way valve. Furthermore, the preheating valve 36 may also be a one-way valve; when it is a one-way valve, it allows unidirectional flow from the outlet 22 of the hot water device 2 to the inlet 21 along the water flow direction.

[0121] Specifically, such as Figure 3 As shown, the inlet valve 35 can be integrated inside the cleaning machine 1; the preheating valve 36 can be installed between the hot water pipe 24 and the return water pipe 23. Specifically, when the hot water device 2 itself is a hot water device 2 with zero cold water function, a four-way connector can be installed on the hot water pipe 24, a three-way connector can be installed on the return water pipe 23, and a combined supply pipe can be installed between the four-way connector and the three-way connector. The preheating valve 36 can be installed in this combined supply pipe.

[0122] like Figure 4As shown, the inlet valve 35 can also be installed in the combined supply pipeline between the inlet 10 and the first circulating water circuit; the preheating valve 36 can be installed between the hot water pipeline 24 and the return water pipeline 23. Specifically, a four-way connector can be installed on the hot water pipeline 24, and a three-way connector can be installed on the return water pipeline 23, with a combined supply pipeline installed between the four-way connector and the three-way connector. The preheating valve 36 can be installed in this combined supply pipeline. A combined supply pipeline is installed between the four-way connector and the cleaning machine 1, and the inlet valve 35 can be installed in the combined supply pipeline between the four-way connector and the cleaning machine 1.

[0123] Taking the preheating valve 36 and the water inlet valve 35 as two-position two-way valves as an example, the preheating valve 36 can connect / disconnect the first circulating water circuit by opening / closing. The water inlet valve 35 is used to control the connection / disconnection between the cleaning machine 1 and the hot water device 2 by opening / closing.

[0124] In the embodiments described in this specification, the state switching of the switching device is mainly based on the water temperature in the first circulating water circuit. In one embodiment, the combined cooling and power supply system may further include a first temperature sensor 51 for detecting the water temperature in the first circulating water circuit. When the temperature detected by the first temperature sensor 51 reaches the target water temperature, the switching device switches from the first state to the second state.

[0125] In this embodiment, the first temperature sensor 51 is mainly used to detect the water temperature in the first circulating water path. When the first temperature sensor 51 detects that the current water temperature in the first circulating water path has reached the target water temperature, it indicates that the hot water device 2 can supply water with a sufficiently high temperature to the cleaning machine 1 for cleaning. At this time, the switching device can be switched from the first state to the second state. When the switching device is in the first state, the first circulating water path can be formed; when the switching device is in the second state, the outlet 22 of the hot water device 2 can be connected to the inlet 10 of the cleaning machine 1.

[0126] The first temperature sensor 51 is located at at least one of the following positions: near the water inlet 21 of the hot water device 2, or in the switching device.

[0127] When the first temperature sensor 51 is located near the inlet 21 of the hot water device 2, the first temperature sensor 51 can immediately obtain the water temperature (i.e., return water temperature) of the water returning to the hot water device 2 from the first circulating water path outside the hot water device 2, thereby obtaining the water temperature that can be supplied to the cleaning machine 1 more accurately.

[0128] When the hot water device 2 itself is a hot water device 2 with zero cold water function, it is generally equipped with a thermostat at the inlet 21 (i.e., return outlet). The first temperature sensor 51 can utilize the thermostat of the hot water device 2 itself without additional installation.

[0129] In addition, the first temperature sensor 51 can also be installed in the switching device, especially when the switching device is located near the cleaning machine 1 or directly in the cleaning machine 1. When the first temperature sensor 51 is installed on the switching device, the water temperature supplied to the cleaning machine 1 can be accurately detected.

[0130] Of course, the first temperature sensor 51 is not limited to the locations listed above. It can also be set in other locations in the first circulating water circuit, as long as it can directly or indirectly reflect the water temperature supplied by the hot water device 2 to the cleaning machine 1.

[0131] In one embodiment, the cleaning machine 1 is provided with a water cup 11, a second temperature sensor 52 for detecting the water temperature in the water cup 11, and a heating unit. When the temperature detected by the second temperature sensor 52 is lower than the set cleaning temperature, the heating unit can heat the water in the water cup 11 to the set cleaning temperature.

[0132] In this embodiment, the cleaning machine 1 may be equipped with a water cup 11 for receiving cleaning water. The cleaning machine 1 may also be equipped with a second temperature sensor 52 for detecting the water temperature inside the water cup 11. Furthermore, the cleaning machine 1 may also be equipped with a heating unit, which can be located at any position within the cleaning circuit of the cleaning machine 1.

[0133] Specifically, the cleaning circuit of the cleaning machine 1 includes: a water cup 11, a washing pump 12, a spray arm 15, and a connecting pipe between the water cup 11 and the washing pump 12, and between the washing pump 12 and the spray arm 15. The heating unit can be installed in any of the following or a combination thereof: the water cup 11, the washing pump 12, the spray arm 15, and the connecting pipe.

[0134] When the second temperature sensor 52 detects that the current water temperature in the water cup 11 is lower than the set cleaning temperature, the heating unit can be activated to heat the water in the water cup 11 to the set cleaning temperature.

[0135] In this embodiment, taking the heating unit integrated into the water cup 11 as an example, when the second temperature sensor 52 detects that the water temperature in the water cup 11 is lower than the set cleaning temperature, the heating unit can be started first to heat the water in the water cup 11 to the set cleaning temperature before the washing pump 12 and the spray arm 15 are started to perform the cleaning work; or, the washing pump 12 and the spray arm 15 can be started at the same time as the heating unit is started to perform the cleaning work.

[0136] The set cleaning temperature can be stored in the program inside the washing machine 1. The washing machine 1 may include multiple cleaning modes, such as: intensive wash, quick wash, and energy-saving wash. Each cleaning mode can have corresponding stored cleaning time and water temperature. Of course, the set cleaning temperature can also be set and modified by the user according to their needs. For example, when cleaning heavily soiled or greasy tableware, the user can set a higher cleaning temperature.

[0137] In one embodiment, the combined power supply system is further provided with a flow detection device 53 for detecting the amount of water entering the cleaning machine 1, and a washing pump 12 connected to the water cup 11. After the flow signal detected by the flow detection device 53 indicates that the amount of water entering the cleaning machine 1 has reached a preset amount, the washing pump 12 is started.

[0138] In this embodiment, the cleaning machine 1 is generally equipped with a washing pump 12 connected to a water cup 11. The washing pump 12 drives the water in the water cup 11 to the spray arm 15 for spraying onto the object being cleaned. The combined water supply system may also include a flow detection element 53, which detects the amount of water entering the cleaning machine 1. When the flow signal detected by the flow detection element 53 indicates that the current amount of water entering the cleaning machine 1 has reached a preset amount, the washing pump 12 is then activated, driving the spray arm 15 to rotate and spray the object being cleaned. The preset water amount can be approximately 3 liters. Of course, the preset water amount can be set differently depending on the specific model of the cleaning machine 1, etc., and this application does not impose a specific limitation here.

[0139] Furthermore, the method of measuring the amount of water entering the cleaning machine 1 is not limited to the examples mentioned above; it can also be achieved in other ways. For example, a level gauge can be installed inside the water cup 11 to measure the current amount of water in the water cup 11. Alternatively, when the flow rate in the pipeline is constant, the amount of water entering the water cup 11 of the cleaning machine 1 can be determined based on the time signal.

[0140] In one embodiment, the cleaning machine 1 is provided with a drain outlet 13 and a water cup 11, and a second temperature sensor 52 for detecting the water temperature in the water cup 11. The drain outlet 13 is connected to the water cup 11. When the temperature detected by the second temperature sensor 52 is lower than the set cleaning temperature, the water supplied by the hot water device 2 is discharged through the drain outlet 13.

[0141] Generally, the cleaning machine 1 is equipped with a water cup 11 for receiving cleaning water. Additionally, the cleaning machine 1 is equipped with a drain outlet 13 and a drain pump 14. The drain outlet 13 is connected to the water cup 11. Activating the drain pump 14 discharges the cleaning water from the water cup 11. Furthermore, the cleaning machine 1 may also be equipped with a second temperature sensor 52 for detecting the water temperature inside the water cup 11. When the temperature detected by the second temperature sensor 52 is lower than the set cleaning temperature, the drain pump 14 is activated, and water supplied by the hot water device 2 is discharged through the drain outlet 13. When the temperature detected by the second temperature sensor 52 reaches the set cleaning temperature, the washing pump 12 is activated to formally begin the cleaning operation, thereby ensuring that the cleaning water temperature reaches the set cleaning temperature.

[0142] Once the cleaning process begins, the drain pump 14 can be turned off. If, during the cleaning process, the temperature detected by the second temperature sensor 52 is lower than the set cleaning temperature, the heating unit can be activated to raise the cleaning water temperature, while the drain pump 14 remains off. Overall, the process of draining water using the drain pump 14 when the water temperature in the cup has not reached the preset cleaning temperature mainly occurs during the water supply phase before the formal cleaning process begins. Once the cleaning process has started, to ensure that the cleaning operation is not unexpectedly interrupted, the heating unit can be used to raise the cleaning water temperature, while the drain pump 14 remains off.

[0143] In a specific scenario, when the set cleaning temperature is higher than the target water temperature in the first circulating water path; or when the water supplied in the first circulating water path loses heat and the water temperature drops during the process of being supplied to the water cup 11 of the cleaning machine 1, the water with a temperature lower than the set cleaning temperature can be discharged through the drain outlet 13 to ensure that the water temperature for cleaning can reach the set cleaning temperature.

[0144] When the hot water device 2 is a storage-type water heater, the highest water temperature it can provide to the cleaning machine 1 may be lower than the set cleaning temperature required by the cleaning machine. In this case, the cold water section in the pipeline between the hot water device 2 and the cleaning machine 1 can be drained using water from the storage-type water heater, and then hot water at a stable temperature can be supplied to the cleaning machine 1. After the water cup of the cleaning machine 1 receives the hot water at a stable temperature, the heating unit can be used to further increase the water temperature to reach the set cleaning temperature.

[0145] In one embodiment, the combined power supply system is equipped with a water softening module 6. The number of water softening modules 6 can be one or more. Specifically, the cleaning machine 1 can be equipped with a water softening module 6, positioned between the water inlet 10 and the water cup 11 along the water flow direction; or, the hot water device 2 can be equipped with a water softening module 6; or, the combined power supply system can be equipped with a water softening module 6, which is located within the combined power supply pipeline.

[0146] In this embodiment, a water softening module 6 can be installed at any one or more locations in the cleaning machine 1, the hot water device 2, or the combined supply pipeline between the cleaning machine 1 and the hot water device 2. The water softening module 6 is used to adsorb calcium and magnesium ions in the water, preventing scale (calcium carbonate or magnesium carbonate) formation. When the hot water device 2 is equipped with the water softening module 6, meaning the hot water device 2 itself integrates the water softening module 6, it can provide the user with soft water at the target temperature. When soft water meeting the temperature requirements is supplied to the cleaning machine 1, the cleaning effect of the cleaning machine 1 can be further improved.

[0147] When the cleaning machine 1 is equipped with a water softening module 6, the water softening module 6 can be located between the water inlet 10 and the water cup 11. The water entering the water inlet 10 of the cleaning machine 1 can first pass through the water softening module 6 to soften the water, reducing the concentration of calcium and magnesium ions and transforming hard water into soft water. By reducing the concentration of calcium and magnesium ions, scale can be prevented from adhering to the surfaces of tableware and the washing chamber of the cleaning machine, thereby further improving the cleaning effect.

[0148] Furthermore, when the soft water module 6 is installed in the combined water supply pipeline, the cleaning effect it achieves is similar to that of the case where it is integrated into the cleaning machine 1 or the hot water device 2, and this application will not describe it in detail here.

[0149] like Figure 1 As shown, in one embodiment, the switching device is installed in the cleaning machine 1 and controlled by the cleaning machine 1, and the water pump 4 is installed in the hot water device 2 and controlled by the hot water device 2.

[0150] In this embodiment, the switching device can be installed inside the cleaning machine 1 and can be directly controlled by the controller of the cleaning machine 1. The water pump 4 can be installed in the hot water device 2 and directly controlled by the controller of the hot water device 2. The controllers of the cleaning machine 1 and the hot water device 2 can be connected to the Internet of Things (cloud). When the hot water device 2 and the cleaning machine 1 need to be linked, they can communicate with the Internet of Things to perform corresponding control.

[0151] Please refer to the following: Figure 5 Based on the combined heat and power supply system provided by the above embodiments, this application also provides a control method for the combined heat and power supply system, which may include the following steps:

[0152] Step S10: Identify water demand signals;

[0153] Step S11: After receiving the water demand signal, control the switching device to be in the first state and the water pump 4 to be in the working state, and the hot water device 2 and the combined supply pipeline cooperate to form the first circulating water circuit;

[0154] Step S12: Obtain the water temperature in the first circulating water path and compare the water temperature with the target water temperature;

[0155] Step S13: When the water temperature in the first circulating water circuit reaches the target water temperature, the switching device is switched from the first state to the second state, and the hot water device 2 supplies hot water to the cleaning machine 1.

[0156] In this embodiment, the combined heat and power system mainly includes: a cleaning machine 1, a switching device, a hot water device 2, a water pump 4, and a controller. The main actuator of the control method can be the controller, which can be installed in the cleaning machine 1 or the hot water device 2, or independently, or in the cloud. Taking a cloud-based controller as an example, it can communicate with the cleaning machine 1 and the hot water device 2 via a communication module.

[0157] In a specific scenario, the water pump 4 can be installed in the hot water device 2 and directly controlled by the controller of the hot water device 2; the switching device can be installed in the cleaning machine 1 and directly controlled by the controller of the cleaning machine 1. Of course, the water pump 4 and the switching device can also be directly controlled by a controller located in the cloud, and their control logic is basically the same, which will not be described in detail here.

[0158] When a user needs to wash dishes, they can send a water demand signal to the controller via remote control, app settings, or button presses. Upon receiving the user's water demand signal, the controller can first determine the current operating status of the switching device and water pump 4.

[0159] Specifically, the water demand signal includes any one or a combination of the following: the target water temperature, the water quality required for cleaning.

[0160] The water demand signal can include information such as the target water temperature signal and the water quality signal required for cleaning. In addition, the water demand signal can also include other information according to user needs, such as cleaning time.

[0161] When the water demand signal includes the water quality required for cleaning, the control method may further include: controlling the water flow path into the inlet 21 of the hot water device 2 based on the water demand signal.

[0162] Specifically, when the water demand signal includes the water quality required for cleaning, the type of water quality may include: ordinary tap water, softened water softened by the water softening module 6, etc.

[0163] For a combined heat and power system, a water softening module 6 can be installed. This water softening module 6 can be installed upstream of the inlet 21 of the hot water device 2. When the user's water demand signal indicates that the water quality requirement is ordinary tap water, tap water can be directly supplied from the water source 7 to the inlet 21 of the hot water device 2.

[0164] When the water demand signal indicates that the water quality requirement is soft water, the water is controlled to flow through the soft water module 6 first and then into the inlet 21 of the hot water device 2. Subsequently, the water supplied by the hot water device 2 to the cleaning machine 1 is softened and heated water.

[0165] The step of controlling the switching device to be in the first state includes: determining the current state of the switching device; if the switching device is not in the first state, switching the switching device to the first state; if the switching device is currently in the first state, maintaining the switching device in the first state.

[0166] Controlling the water pump 4 to be in working state includes: identifying the current state of the water pump 4; when the water pump 4 is not in working state, that is, when the water pump 4 is not started, starting the water pump 4; if the water pump 4 is already started, maintaining the water pump 4 in working state.

[0167] When the switching device is in the first state and the water pump 4 is in operation, the hot water device 2 and the combined supply pipeline cooperate to form the first circulating water circuit.

[0168] The water temperature in the first circulating water path is obtained and compared with the target water temperature. When the water temperature in the first circulating water path reaches the target water temperature, the switching device is switched from the first state to the second state. The outlet 22 of the hot water device 2 is connected to the inlet 10 of the cleaning machine 1, and the hot water device 2 supplies hot water to the cleaning machine 1.

[0169] Since a first circulating water path is established between the hot water device 2 and the cleaning machine 1, and the water temperature in the first circulating water path reaches the target water temperature, when the hot water device 2 supplies water at the target water temperature to the cleaning machine 1 through part of the first circulating water path, the length of the cold water section of the original water supply pipe between the hot water device 2 and the cleaning machine 1 is shortened. This ensures that the water entering the water cup 11 of the cleaning machine 1 is heated hot water, which raises the water temperature to be cleaned, thereby shortening the cleaning time and improving the cleaning effect.

[0170] In one embodiment, the cleaning machine 1 is equipped with a washing pump 12, and the control method may further include: obtaining the amount of water entering the cleaning machine 1, and starting the washing pump 12 of the cleaning machine 1 after the amount of water entering reaches a preset amount.

[0171] Generally, before the washing machine 1 begins cleaning, the water intake must reach a preset water volume, meaning the required water volume for cleaning is met before the washing pump 12 is started. Therefore, before starting the washing pump 12 of the washing machine 1 to begin cleaning, the water intake volume entering the washing machine 1 can be obtained to determine whether the current water intake volume has reached the preset water volume. If the preset water volume has been reached, the washing pump 12 of the washing machine 1 can be started to begin cleaning. If the preset water volume has not been reached, water intake continues until the preset water volume is reached.

[0172] The method for detecting whether the water intake of the cleaning machine 1 has reached the preset water volume can be the flow detection device 53 as described in the above-mentioned combined supply system implementation, or a level gauge can be directly installed in the water cup 11, or other methods that can determine the current water intake of the cleaning machine 1. The specific details will not be elaborated here.

[0173] In another embodiment, the control method may further include: acquiring the inlet water volume and the water temperature supplied to the cleaning machine 1; and starting the washing pump 12 of the cleaning machine 1 after the inlet water volume reaches a preset water volume and the water temperature reaches a preset cleaning temperature.

[0174] In this embodiment, the main difference from the above embodiment is that: before starting the washing pump 12 of the cleaning machine 1, in addition to obtaining the water inlet volume of the cleaning machine 1 and ensuring that the water inlet volume reaches the preset water volume, the control method also includes obtaining the water temperature supplied to the cleaning machine 1, ensuring that the water temperature supplied to the cleaning machine 1 reaches the preset cleaning temperature and the water inlet volume reaches the preset water volume, and then starting the washing pump 12 of the cleaning machine 1 to formally enter the cleaning work.

[0175] The combined power supply system is also equipped with a heating unit. In one case, when the obtained water temperature is lower than the set cleaning temperature, the heating unit in the cleaning machine 1 is activated.

[0176] The heating unit is used to raise the water temperature for cleaning. Specifically, the specific form and installation location of the heating unit can be found in the detailed description of the above-described combined heat and power system implementation method, and will not be repeated here. When the water temperature supplied to the cleaning machine 1 is lower than the set cleaning temperature, the heating unit in the cleaning machine 1 can be activated until the water temperature reaches the preset cleaning temperature. Then, the washing pump 12 of the cleaning machine 1 is activated to begin the cleaning process.

[0177] It should be noted that if the water temperature supplied to the washing machine 1 does not reach the preset washing temperature, but the difference is within a certain range (e.g., the water temperature is already close to the preset washing temperature), the heating unit in the washing machine 1 can be activated simultaneously with the washing pump 12 for simultaneous heating and washing, achieving a relatively ideal cleaning effect in a shorter time. In other words, the preset washing temperature can be not only a single temperature value but also a temperature range.

[0178] Furthermore, the control method may also include: determining whether the water intake of the cleaning machine 1 has ended; when the water intake reaches a preset water volume, controlling the switching device to switch to a third state, wherein when the switching device is in the third state, the outlet 22 of the hot water device 2 is not connected to the inlet 10 of the cleaning machine 1, and the first circulating water circuit is in a disconnected state.

[0179] In this embodiment, once the influent volume has reached the preset volume, the switching device can be switched to the third state. This third state can vary depending on the specific form of the switching device.

[0180] For example, taking the switching device as a three-way switching valve 30, when the three-way switching valve 30 is in the third state, the third interface 303 is in the closed state, and the third interface 303 is not connected to the first interface 301 and the second interface 302. The outlet 22 of the hot water device 2 is not connected to the inlet 10 of the cleaning machine 1, and the first circulating water circuit is in the disconnected state.

[0181] Taking the switching device including the inlet valve 35 and the preheating valve 36 as an example, when the switching device is in the third state, both the inlet valve 35 and the preheating valve 36 can be in the off state, the outlet 22 of the hot water device 2 is not connected to the inlet 10 of the cleaning machine 1, and the first circulating water circuit is in the off state.

[0182] Please refer to the following: Figure 6 Based on the combined heat and power supply system provided by the above embodiments, this application also provides a control method for the combined heat and power supply system, which may include the following steps:

[0183] Step S21: Identify water demand signals through the controller;

[0184] Step S22: After the controller receives the water demand signal, it determines the current working state of the hot water device 2. When the hot water device 2 is in the standby water supply state, it controls the switching device to be in the first state and the water pump 4 to be in the working state. The hot water device 2 and the combined supply pipeline cooperate to form the first circulating water circuit.

[0185] Step S23: Obtain the water temperature in the first circulating water path and compare the obtained water temperature with the target water temperature;

[0186] Step S24: When the water temperature in the first circulating water circuit reaches the target water temperature, the switching device is switched from the first state to the second state, and the hot water device 2 supplies hot water to the cleaning machine 1.

[0187] The core control steps of this control method are similar to those in the above embodiments. This application mainly describes the differences between the two, while the similarities can be compared and referred to. This application will not elaborate further here.

[0188] In this embodiment, after the controller receives the water demand signal, the control method includes: determining the current working state of the hot water device 2; when the hot water device 2 is in a standby state, controlling the switching device to be in a first state and the water pump 4 to be in a working state; and the hot water device 2 and the combined supply pipeline cooperate to form the first circulating water circuit.

[0189] The hot water device 2 includes both instantaneous and storage-type water heaters, and its standby state can vary depending on its type. For example, when the hot water device 2 is an instantaneous water heater, its standby state includes the heating unit being in a non-operating state; when the hot water device 2 is a storage-type water heater, its standby state includes the water temperature stored in the hot water device 2 reaching the target water temperature.

[0190] When the hot water device 2 is an instantaneous water heater, its heating unit must be in a non-operating state. If the heating unit of the hot water device 2 is operating, it means the user is currently using water, for example, taking a shower. If the hot water device 2 then supplies water to the washing machine 1, it will inevitably divert the hot water flow, reducing the amount of hot water available at the shower terminal. Without a thermostat, this will also cause temperature fluctuations, thus degrading the user experience. To avoid this and ensure a better user experience, when the hot water device 2 is an instantaneous water heater, its heating unit must be in a non-operating state before supplying water to the washing machine 1, meaning the user is not using hot water.

[0191] Of course, if the hot water supply capacity of the hot water device 2 is large enough and the user's water terminal has a constant temperature regulation function, the hot water device 2 may also supply water to the cleaning machine 1 and other water terminals at the same time. In this case, the standby state of the hot water device 2 can disregard the working state of the heating unit.

[0192] When the hot water device 2 is a storage-type water heater, it is necessary to ensure that the water temperature in the storage unit (e.g., the inner tank) of the hot water device 2 has reached the target water temperature.

[0193] Subsequently, when the hot water device 2 is in the standby water supply state, the switching device is controlled to be in the first state and the water pump 4 is in the working state, and the hot water device 2 and the combined supply pipeline cooperate to form the first circulating water circuit.

[0194] Please refer to the following: Figure 7 The following will describe the control method in detail with a specific scenario. In this combined heat and power system, the hot water device 2 is a hot water device 2 with zero cold water function, and the switching device is in the form of a three-way switching valve 30.

[0195] When a user has a cleaning need (such as washing dishes), they can generate a water demand signal through the touch panel of the cleaning machine 1, or remote control, or mobile terminal APP, or by timed triggering; when the controller detects the water demand signal, it can determine the current working status of the water pump 4 (preheating circulation pump).

[0196] If water pump 4 is in normal start-up mode, the first temperature sensor can be used to determine whether the current preheating effect has reached the threshold, i.e., whether the water temperature has reached the target water temperature. This first temperature sensor can be a thermostat integrated into the hot water device 2. If the water temperature meets the requirement, the switching valve can be switched from the first state to the second state, using the first circulating water path to supply hot water to the cleaning machine 1. If the water temperature does not meet the requirement, the switching valve remains in the first state, continuing to circulate and heat the water in the water path until the target water temperature is reached.

[0197] If water pump 4 does not start, it can be further determined whether the water temperature in the first circulating water circuit has reached the target water temperature, that is, whether the preheating effect of the first circulating water circuit of the hot water device 2 has reached the threshold. If the water temperature in the first circulating water circuit meets the requirements, the hot water in the first circulating water circuit can be supplied to the cleaning machine 1. Specifically, the second interface 302 and the third interface 303 can be connected. If water pump 4 does not start and the water temperature in the first circulating water circuit has not reached the target water temperature, water pump 4 can be started to allow the water in the first circulating water circuit to flow through the heating unit of the hot water device 2, thereby enabling the water temperature in the first circulating water circuit to reach the target water temperature.

[0198] Once the water pump 4 starts and the water temperature in the first circulating water circuit reaches the target water temperature, the flow meter can be used to determine whether the current water supply to the cleaning machine 1 has reached the set value (preset water volume). When the water supply reaches the set value, the water supply can be stopped, the washing pump 12 of the cleaning machine 1 can be started, and the cleaning operation can begin until the entire washing program is completed.

[0199] When using the combined power supply system and control method provided in this application, the water inlet pipe is preheated and circulated before water enters the cleaning machine 1, shortening or directly removing the cold water section in the pipe. Compared with the scheme without preheating and circulating the water inlet pipe, the water temperature entering the cleaning machine 1 can be increased by more than 50%, increasing the hot water washing time and significantly improving the cleaning effect.

[0200] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0201] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0202] The above are merely a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as described above, the content is only for the purpose of facilitating understanding of the present invention and is not intended to limit the present invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in the present invention. However, the patent protection scope of the present invention shall still be determined by the scope defined in the appended claims.

Claims

1. A combined heat and power (CHP) system, characterized in that, The combined heat and power system includes: a cleaning machine and a hot water device; The cleaning machine is equipped with a water inlet; The hot water device is equipped with an inlet and an outlet; The inlet and outlet of the hot water device are connected to the inlet of the cleaning machine via a combined supply pipeline. The combined power supply system also includes a switching device and a water pump, as well as a controller that can communicate with the cleaning machine, the hot water device, the water pump and the switching device; The switching device includes a first state and a second state. When the switching device is in the first state, the hot water device can cooperate with at least part of the combined supply pipeline to form a first circulating water circuit. When the switching device is in the second state, the outlet of the hot water device is connected to the inlet of the cleaning machine, and the hot water device supplies water to the cleaning machine. The switching device is a three-way switching valve, which includes a first interface, a second interface and a third interface. The first interface and the second interface are respectively connected to the combined power supply pipeline, and the third interface is connected to the water inlet. When the three-way switching valve is in the first state, the first interface and the second interface are connected, and the hot water device and the combined supply pipeline cooperate to form the first circulating water circuit. When the three-way switching valve is in the second state, the second interface is connected to the third interface, and the outlet of the hot water device is connected to the inlet of the cleaning machine.

2. The combined heat and power system as described in claim 1, characterized in that, The water inlet can also be connected to the return water pipe, and the water outlet can also be connected to the hot water pipe. The hot water device can cooperate with the return water pipe and the hot water pipe to form a second circulating water circuit.

3. The combined heat and power system as described in claim 2, characterized in that, The combined water supply pipeline and the return water pipeline share a portion near the water inlet, and the combined water supply pipeline and the hot water pipeline share a portion near the water outlet.

4. The combined heat and power system as described in claim 3, characterized in that, The return water pipeline is a cold water pipeline connected to the water inlet.

5. The combined heat and power system as described in claim 1, characterized in that, The switching device is installed inside the cleaning machine, or the switching device is distributed in the cleaning machine and the combined power supply pipeline, or the switching device is installed in the combined power supply pipeline.

6. The combined heat and power system as described in claim 2, characterized in that, The combined supply pipeline includes a first pipe section and a second pipe section. One end of the first pipe section is connected to the hot water pipeline, and the other end is connected to the second interface. One end of the second pipe section is connected to the return water pipeline, and the other end is connected to the first interface.

7. The combined heat and power system as described in claim 1, characterized in that, The water pump is installed in any of the following locations: In the hot water device, in the cleaning machine, and in the combined power supply pipeline.

8. The combined heat and power system as described in any one of claims 1 to 7, characterized in that, The combined power supply system also includes a first temperature sensor for detecting the water temperature in the first circulating water circuit. When the temperature detected by the first temperature sensor reaches the target water temperature, the switching device switches from the first state to the second state.

9. The combined heat and power system as described in claim 8, characterized in that, The first temperature sensor is located at at least one of the following locations: near the water inlet of the hot water device, or in the switching device.

10. The combined heat and power system as described in claim 8, characterized in that, The cleaning machine is equipped with a water cup, a second temperature sensor for detecting the water temperature in the water cup, and a heating unit. When the temperature detected by the second temperature sensor is lower than the set cleaning temperature, the heating unit can heat the water in the water cup to the set cleaning temperature.

11. The combined heat and power system as described in claim 10, characterized in that, The combined power supply system is also equipped with a flow detection device for detecting the amount of water entering the cleaning machine, and a washing pump connected to the water cup. After the flow signal detected by the flow detection device indicates that the amount of water entering the cleaning machine has reached a preset amount, the washing pump is started.

12. The combined heat and power system as described in claim 8, characterized in that, The cleaning machine is equipped with a drain outlet, a water cup, and a second temperature sensor for detecting the water temperature inside the water cup. The drain outlet is connected to the water cup. When the temperature detected by the second temperature sensor is lower than the set cleaning temperature, the water supplied by the hot water device is discharged through the drain outlet.

13. The combined heat and power system as described in claim 5, characterized in that, The cleaning machine is equipped with a water softening module; and / or, the hot water device is equipped with a water softening module; and / or, the combined power supply system is equipped with a water softening module, which is installed in the combined power supply pipeline.

14. The combined heat and power system as described in claim 1, characterized in that, The controller is installed in the cleaning machine; or... The controller is installed in the hot water device; or... The controller is set independently; or... The controller is located in the cloud, and the hot water device and the cleaning machine are equipped with communication modules.

15. The combined heat and power system as described in claim 1, characterized in that, The switching device is installed in the cleaning machine and controlled by the cleaning machine, and the water pump is installed in the hot water device and controlled by the hot water device.

16. A control method for a combined heat and power (CHP) system according to claim 1, characterized in that, The control method includes: Identify water demand signals; Upon receiving the water demand signal, the switching device is controlled to be in the first state and the water pump is in the working state, and the hot water device and the combined supply pipeline cooperate to form the first circulating water circuit; Obtain the water temperature in the first circulating water path and compare the water temperature with the target water temperature; When the water temperature in the first circulating water circuit reaches the target water temperature, the switching device is switched from the first state to the second state, and the hot water device supplies water to the cleaning machine.

17. A control method for a combined heat and power (CHP) system according to claim 1, characterized in that, The control method includes: The controller identifies water demand signals. After receiving the water demand signal, the controller determines the current working status of the hot water device. When the hot water device is in the standby water supply state, it controls the switching device to be in the first state and the water pump to be in the working state. The hot water device and the combined supply pipeline cooperate to form the first circulating water circuit. The water temperature in the first circulating water path is obtained, and the obtained water temperature is compared with the target water temperature; When the water temperature in the first circulating water circuit reaches the target water temperature, the switching device is switched from the first state to the second state, and the hot water device supplies water to the cleaning machine.

18. The control method as described in claim 17, characterized in that, The hot water system includes instantaneous water heaters and storage water heaters. When the hot water device is an instantaneous water heater, the hot water device being in a standby state includes: the heating unit of the hot water device being in a non-working state; When the hot water device is a storage-type water heater, the hot water device being in a standby state includes: the water temperature stored in the hot water device reaching the target water temperature.

19. The control method as described in claim 16 or 17, characterized in that, The cleaning machine is equipped with a washing pump, and the control method further includes: The amount of water entering the cleaning machine is obtained, and the washing pump of the cleaning machine is started after the amount of water entering the machine reaches the preset amount.

20. The control method as described in claim 16 or 17, characterized in that, The cleaning machine is equipped with a washing pump, and the control method further includes: The amount of water entering the cleaning machine and the water temperature supplied to the cleaning machine are obtained; Once the incoming water volume reaches the preset water volume and the water temperature reaches the preset cleaning temperature, the washing pump of the cleaning machine is started.

21. The control method as described in claim 20, characterized in that, The combined power supply system is also equipped with a heating unit. When the obtained water temperature is lower than the set cleaning temperature, the heating unit in the cleaning machine is activated.

22. The control method as described in claim 16 or 17, characterized in that, The control method further includes: Determine whether the water intake of the cleaning machine has ended; When the water inlet reaches the preset water volume, the switching device is controlled to switch to the third state. When the switching device is in the third state, the outlet of the hot water device is not connected to the inlet of the cleaning machine, and the first circulating water circuit is disconnected.

23. The control method as described in claim 16 or 17, characterized in that, The water demand signal includes any one or a combination of the following: the target water temperature, the water quality required for cleaning.

24. The control method as described in claim 23, characterized in that, When the water demand signal includes the water quality required for cleaning, the control method further includes: controlling the water flow path entering the inlet of the hot water device based on the water demand signal.

25. The control method as described in claim 24, characterized in that, The combined water supply system is equipped with a water softening module. When the water demand signal indicates that the water quality requirement is soft water, the water is controlled to flow through the water softening module before entering the inlet of the hot water device.

26. The control method as described in claim 16 or 17, characterized in that, The step of controlling the switching device to be in the first state includes: determining the current state of the switching device, and when the switching device is not in the first state, switching the switching device to the first state.

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