A water return device and a hot water system

Abstract

This utility model discloses a water return device, a hot water system, and a control method. The water return device includes a hot water pipe, a cold water pipe, a bypass pipe, a water return pump, a switch valve, and a water return controller. The inlet end of the hot water pipe is used to connect to the hot water outlet end of the water heater, and the outlet end of the hot water pipe is used to connect to the hot water inlet end of the water-using equipment. The inlet end of the cold water pipe is used to connect to the cold water inlet end of the water heater and the cold water supply pipe, and the outlet end of the cold water pipe is used to connect to the cold water inlet end of the water-using equipment. The bypass pipe is set between the hot water pipe and the cold water pipe. The water return pump is set on the hot water pipe between the inlet end of the hot water pipe and the connection point between the bypass pipe and the hot water pipe. The switch valve is set on the bypass pipe. During the circulation preheating process, the circulation pump in the water heater and the water return pump in the water return device can operate simultaneously, which can increase the water flow in the pipeline, avoid the problem that the water heater cannot start heating due to insufficient water flow, shorten the circulation preheating time, and improve the circulation preheating efficiency.

Description

Technical Field

[0001] This utility model relates to heating technology, and more particularly to a water return device and a hot water system. Background Technology

[0002] Zero-cold-water technology refers to a water heater that provides instant hot water without requiring users to wait for cold water to flow out. This technology utilizes a circulating pump within the water heater to preheat the water before it is used, circulating cold water back into the heater for further preheating. This ensures the pipes are filled with hot water, thus eliminating the need for the cold water to drain out that is common in traditional water heaters.

[0003] Due to limitations in the power of existing circulating pumps, the length of the circulating preheating pipes in hot water systems is usually relatively short. However, in large apartments or villas, the distance between the water heater and the point of use is longer, resulting in longer circulating preheating pipes. This can lead to insufficient water flow in the circulating preheating pipes to meet the minimum starting flow of the water heater, or excessively long circulating preheating times and low circulating preheating efficiency. Utility Model Content

[0004] One of the technical problems solved by this utility model is to provide a water return device that can increase the water flow in the pipeline, avoid the problem that the water heater cannot start heating due to insufficient water flow, shorten the excessively long circulation preheating time, and improve the circulation preheating efficiency.

[0005] The second technical problem solved by this utility model is to provide a hot water system that can increase the water flow in the pipeline, avoid the problem that the water heater cannot start heating due to insufficient water flow, shorten the excessively long circulation preheating time, and improve circulation preheating efficiency.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A water return device, comprising:

[0008] A hot water pipe, wherein the inlet end of the hot water pipe is used to connect to the hot water outlet end of the water heater, and the outlet end of the hot water pipe is used to connect to the hot water inlet end of the water-using equipment;

[0009] A cold water pipe, wherein the inlet end of the cold water pipe is used to connect the cold water inlet end of the water heater and the cold water supply pipe, and the outlet end of the cold water pipe is used to connect the cold water inlet end of the water-using equipment;

[0010] A bypass pipe is provided between the hot water pipe and the cold water pipe to connect the hot water pipe and the cold water pipe;

[0011] A return water pump is installed on the hot water pipe between the inlet end of the hot water pipe and the connection point between the bypass pipe and the hot water pipe.

[0012] A switching valve, wherein the switching valve is disposed on the bypass pipe;

[0013] A return water controller, which is electrically connected to the return water pump and the switching valve.

[0014] The water return device provided by this utility model includes a hot water pipe, a cold water pipe, a bypass pipe, a water return pump, a switch valve, and a water return controller. The inlet end of the hot water pipe is used to connect to the hot water outlet end of the water heater, and the outlet end of the hot water pipe is used to connect to the hot water inlet end of the water-using equipment. The inlet end of the cold water pipe is used to connect to the cold water inlet end of the water heater and the cold water supply pipe, and the outlet end of the cold water pipe is used to connect to the cold water inlet end of the water-using equipment. The bypass pipe is set between the hot water pipe and the cold water pipe to connect the hot water pipe and the cold water pipe. The water return pump is set on the hot water pipe between the inlet end of the hot water pipe and the connection point between the bypass pipe and the hot water pipe. The switch valve is set on the bypass pipe. The water return controller is electrically connected to the water return pump and the switch valve. During the circulation preheating process, the circulation pump in the water heater and the water return pump in the water return device can operate simultaneously, which can increase the water flow in the pipeline and avoid the problem that the water heater cannot start heating due to insufficient water flow. In addition, the increased water flow in the pipeline can shorten the circulation preheating time and improve the circulation preheating efficiency.

[0015] In some embodiments of this utility model, the return water device further includes a one-way valve, which is disposed on the bypass pipe so that the water in the hot water pipe flows unidirectionally to the cold water pipe through the bypass pipe.

[0016] In some embodiments of this utility model, the water return device further includes a first wireless communication module, which is electrically connected to the water return controller, and the water return controller receives the circulation preheating command through the first wireless communication module.

[0017] In some embodiments of this utility model, the water return device further includes a water return flow sensor, which is disposed on the hot water pipe between the inlet end of the hot water pipe and the connection point between the bypass pipe and the hot water pipe, and the water return flow sensor is electrically connected to the water return controller.

[0018] In some embodiments of this utility model, the return water device further includes a return water temperature sensor, which is disposed on the hot water pipe between the inlet end of the hot water pipe and the connection point between the bypass pipe and the hot water pipe, or disposed on the bypass pipe, and the return water temperature sensor is electrically connected to the return water controller.

[0019] In some embodiments of this utility model, the water return device further includes a power module, which is electrically connected to the water return pump, the switching valve and the water return controller, and supplies power to the water return pump, the switching valve and the water return controller.

[0020] In some embodiments of this utility model, the water return device further includes a housing, the housing having a receiving cavity, and the water return pump, the bypass pipe, the switching valve and the water return controller are all disposed within the receiving cavity of the housing;

[0021] The housing is provided with a hot water inlet, a hot water outlet, a cold water inlet, and a cold water outlet. The hot water pipe passes through the housing, with its inlet end extending outward through the hot water inlet and its outlet end extending outward through the hot water outlet. The cold water pipe passes through the housing, with its inlet end extending outward through the cold water inlet and its outlet end extending outward through the cold water outlet.

[0022] The second technical problem mentioned above is solved by the following technical solution:

[0023] A hot water system includes a water return device as provided in any of the foregoing embodiments of the present invention, and also includes a water heater and at least one water-using device, wherein each water-using device is provided with a corresponding water return device;

[0024] The inlet end of the hot water pipe of the return water device is connected to the hot water outlet end of the water heater, and the outlet end of the hot water pipe is connected to the hot water inlet end of the water-using equipment.

[0025] The inlet end of the cold water pipe of the return water device is connected to the cold water inlet end and the cold water supply pipe of the water heater, respectively, and the outlet end of the cold water pipe is connected to the cold water inlet end of the water-using equipment.

[0026] The water heater includes a cold water inlet pipe, a hot water outlet pipe, a circulating water pump, a heating module, an inlet flow sensor, and a hot water controller;

[0027] The water inlet of the heating module is connected to the cold water inlet pipe, and the water outlet of the heating module is connected to the hot water outlet pipe.

[0028] Both the circulating water pump and the inlet flow sensor are installed on the cold water inlet pipe;

[0029] The circulating water pump, the inlet flow sensor, and the heating module are all connected to the hot water controller.

[0030] In some embodiments of this utility model, the water heater further includes a second wireless communication module, which is electrically connected to the water heater controller, and the water heater controller receives the circulating preheating command through the second wireless communication module.

[0031] In some embodiments of this utility model, the water heater further includes an inlet water temperature sensor and an outlet water temperature sensor. The inlet water temperature sensor is disposed on the cold water inlet pipe, and the outlet water temperature sensor is disposed on the hot water outlet pipe. Both the inlet water temperature sensor and the outlet water temperature sensor are electrically connected to the water heater controller. Attached Figure Description

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a schematic diagram of the structure of a water return device provided by this utility model;

[0034] Figure 2 A schematic diagram of a hot water system provided by this utility model;

[0035] Figure 3 A flowchart of a hot water system control method provided by this utility model. Detailed Implementation

[0036] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Additionally, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0039] Figure 1 This is a structural schematic diagram of a water return device provided by this utility model. Figure 2 This is a schematic diagram of a hot water system provided by the present invention. The return water device can be installed on the pipeline close to the water-using equipment, such as... Figure 1 , 2 As shown, the water return device 100 includes:

[0040] The cold water pipe 101 has an inlet end 1011 for connecting the cold water inlet end 201 of the water heater 200 and the cold water supply pipe 202, and an outlet end 1012 for connecting the cold water inlet end 301 of the water-using equipment 300.

[0041] Hot water pipe 102, the inlet end 1021 of hot water pipe 102 is used to connect to the hot water outlet end 203 of water heater 200, and the outlet end 1022 of hot water pipe 102 is used to connect to the hot water inlet end 302 of water-using equipment 300.

[0042] A bypass pipe 103 is provided between the hot water pipe 102 and the cold water pipe 101 to connect the hot water pipe 102 and the cold water pipe 101.

[0043] A return water pump 104 is installed on the hot water pipe 102 between the inlet end 1021 of the hot water pipe 102 and the connection point between the bypass pipe 103 and the hot water pipe 102.

[0044] Switch valve 105 is disposed on bypass pipe 103. For example, switch valve 105 may be a solenoid valve.

[0045] The return water controller 106 is electrically connected to the return water pump 104 and the switching valve 105. The return water controller 106 is configured to control the switching valve 105 to open, connecting the hot water pipe 102 and the cold water pipe 101, and to control the return water pump 104 to start when a circulation preheating command is received.

[0046] For example, when the water heater 200 receives a preheating command, its circulation pump starts and begins heating. Upon receiving the preheating command, the return water controller 106 controls the opening of the switch valve 105, connecting the hot water pipe 102 and the cold water pipe 101, and controls the start of the return water pump 104. Cold water in the pipeline flows back to the water heater 200 via the hot water pipe 102, bypass pipe 103, and cold water pipe 101 of the return water device 100. After being heated by the water heater 200, it returns to the return water device 100, thus performing preheating circulation until the water temperature in the pipeline reaches the set temperature or the circulation time reaches the set time. At this point, the water heater 200 stops heating, the circulation pump stops running, and the return water controller 106 controls the switch valve 105 to close and the return water pump 104 to stop running. Since a return water pump 104 is installed on the hot water pipe 102 of the return water device 100, the circulating water pump in the water heater 200 and the return water pump 104 in the return water device 100 can operate simultaneously during the circulation preheating process. This can increase the water flow in the pipeline, avoid the problem that the water heater cannot start heating due to insufficient water flow. In addition, the increased water flow in the pipeline can shorten the circulation preheating time and improve the circulation preheating efficiency.

[0047] The water return device provided by this utility model includes a hot water pipe, a cold water pipe, a bypass pipe, a water return pump, a switch valve, and a water return controller. The inlet end of the hot water pipe is used to connect to the hot water outlet end of the water heater, and the outlet end of the hot water pipe is used to connect to the hot water inlet end of the water-using equipment. The inlet end of the cold water pipe is used to connect to the cold water inlet end of the water heater and the cold water supply pipe, and the outlet end of the cold water pipe is used to connect to the cold water inlet end of the water-using equipment. The bypass pipe is set between the hot water pipe and the cold water pipe to connect the hot water pipe and the cold water pipe. The water return pump is set on the hot water pipe between the inlet end of the hot water pipe and the connection point between the bypass pipe and the hot water pipe. The switch valve is set on the bypass pipe. The water return controller is electrically connected to the water return pump and the switch valve. During the circulation preheating process, the circulation pump in the water heater and the water return pump in the water return device can operate simultaneously, which can increase the water flow in the pipeline and avoid the problem that the water heater cannot start heating due to insufficient water flow. In addition, the increased water flow in the pipeline can shorten the circulation preheating time and improve the circulation preheating efficiency.

[0048] In some embodiments of this utility model, the return water device 100 further includes a one-way valve 107, which is disposed on the bypass pipe 103 to allow water from the hot water pipe 102 to flow unidirectionally to the cold water pipe 101 through the bypass pipe 103, thus preventing cold water in the cold water pipe 101 from flowing back into the hot water pipe 102 during the circulating preheating process. It should be noted that in other embodiments of this utility model, if the water pressure in the hot water pipe 102 is greater than the water pressure in the cold water pipe 101, the one-way valve 107 may not be necessary, saving material costs.

[0049] In some embodiments of this utility model, the water return device 100 further includes a first wireless communication module 108, which is electrically connected to the water return controller 106. The water return controller 106 receives the circulation preheating command through the first wireless communication module 108. For example, the first wireless communication module 108 may be a Bluetooth communication module or a WIFI communication module, and this utility model does not limit it.

[0050] In some embodiments of this utility model, the return water device 100 further includes a return water flow sensor 109. The return water flow sensor 109 is disposed on the hot water pipe 102 between the inlet end 1021 of the hot water pipe 102 and the connection point between the bypass pipe 103 and the hot water pipe 102. The return water flow sensor 109 is electrically connected to the return water controller 106. The return water flow sensor 109 is used to collect the water flow rate in the hot water pipe 102 and upload it to the return water controller 106.

[0051] In some embodiments of this utility model, the return water device 100 further includes a return water temperature sensor 110. The return water temperature sensor 110 is disposed on the hot water pipe 102 between the inlet end 1021 of the hot water pipe 102 and the connection point between the bypass pipe 103 and the hot water pipe 102, or disposed on the bypass pipe 103. The return water temperature sensor 110 is electrically connected to the return water controller 106. The return water temperature sensor 110 is used to collect the water temperature in the hot water pipe 102 or the bypass pipe 103 and upload it to the return water controller 106.

[0052] In some embodiments of this utility model, the water return device 100 further includes a power module 111, which is electrically connected to the water return pump 104, the switching valve 105, and the water return controller 105, and supplies power to the water return pump 104, the switching valve 105, and the water return controller 105. The power module 111 can be an external 220V AC power module or a rechargeable battery, and this utility model does not limit it.

[0053] In some embodiments of this utility model, the water return device 100 further includes a housing 112, which forms a receiving cavity. The water return pump 104, bypass pipe 103, switching valve 105, water return controller 106, one-way valve 107, first wireless communication module 108, water return flow sensor 109, water return temperature sensor 110, and power module 111 are all disposed within the receiving cavity of the housing 112. For example, the housing 112 is a sealed housing with waterproof function to prevent external moisture from entering the interior of the housing 112, which could cause short circuit faults in the water return pump 104, switching valve 105, water return controller 106, first wireless communication module 110, and power module 111. For example, in this embodiment of the present invention, the cavity of the housing 112 can be filled with foam to fix the bypass pipe 103, return water pump 104, switch valve 105, return water controller 106, one-way valve 107, first wireless communication module 108, return water flow sensor 109, return water temperature sensor 110, and power module 111, thus preventing external vibrations from causing the components to loosen. In addition, the foam wrapping the cold water pipe 101 and hot water pipe 102 also has a heat insulation function.

[0054] For example, the housing 112 is provided with a hot water inlet, a hot water outlet, a cold water inlet, and a cold water outlet. The hot water pipe 102 is inserted into the housing 112, and the inlet end 1021 of the hot water pipe 112 extends outward through the hot water inlet, and the outlet end 1022 of the hot water pipe 102 extends outward through the hot water outlet. The cold water pipe 101 is inserted into the housing 112, and the inlet end 1011 of the cold water pipe 101 extends outward through the cold water inlet, and the outlet end 1012 of the cold water pipe 101 extends outward through the cold water outlet.

[0055] This utility model also provides a hot water system, see reference. Figure 2 The hot water system includes the return water device 100 provided in any of the aforementioned embodiments, as well as a water heater 200 and at least one water-using device 300, with each water-using device 300 corresponding to a return water device 100.

[0056] The inlet 1011 of the cold water pipe 101 of the return water device 100 is connected to the cold water inlet 201 and the cold water supply pipe 202 of the water heater 200, respectively. The outlet 1021 of the cold water pipe 101 is connected to the cold water inlet 301 of the water-using equipment 300. The inlet 1021 of the hot water pipe 102 of the return water device 100 is connected to the hot water outlet 203 of the water heater 200, and the outlet 1022 of the hot water pipe 102 is connected to the hot water inlet 302 of the water-using equipment 300.

[0057] The water heater 200 includes a cold water inlet pipe 204, a hot water outlet pipe 205, a circulating water pump 206, a heating module 207, an inlet flow sensor 208, and a hot water controller 209. The inlet end of the heating module 207 is connected to the cold water inlet pipe 204 of the water heater 200, and the outlet end of the heating module 207 is connected to the hot water outlet pipe 205 of the water heater 200. The circulating water pump 206 and the inlet flow sensor 208 are both mounted on the cold water inlet pipe 204. The circulating water pump 206, the inlet flow sensor 208, and the heating module 207 are all electrically connected to the hot water controller 209. For example, when the hot water controller 209 receives a preheating command, it controls the circulating water pump 206 and the heating module 207 to start. When the return water controller 106 receives a preheating command, it controls the opening of the switch valve 105, connecting the hot water pipe 102 and the cold water pipe 101, and controls the start of the return water pump 104. The cold water in the pipeline flows back to the water heater 200 through the hot water pipe 102, bypass pipe 103, and cold water pipe 101 of the return water device 100. After being heated by the heating module 207, it returns to the return water device 100. This cycle of preheating continues until the water temperature in the pipeline reaches the set temperature or the cycle time reaches the set time. At this point, the hot water controller 209 controls the circulating water pump 206 and the heating module 207 to stop running, and the return water controller 106 controls the switch valve 105 to close and the return water pump 104 to stop running.

[0058] For example, the water heater 200 can be a gas water heater or an electric water heater. When the water heater 200 is a gas water heater, the heating module 207 can include a burner and a heat exchanger. When the water heater 200 is an electric water heater, the heating module 207 can include the water heater inner tank and an electric heating element.

[0059] For example, the water-using equipment 300 includes a water-using equipment body 303, a temperature regulating valve 304, a first one-way valve 305, a second one-way valve 306, and a switch valve 307. The inlet end of the first one-way valve 305 is connected to the cold water inlet end 301 through a pipe, the outlet end of the first one-way valve 305 is connected to the first inlet end of the temperature regulating valve 304, the inlet end of the second one-way valve 306 is connected to the hot water inlet end 302 through a pipe, the outlet end of the second one-way valve 306 is connected to the second inlet end of the temperature regulating valve 304, the outlet end of the temperature regulating valve 304 is connected to the inlet end of the water-using equipment body 303, and the switch valve 307 is disposed on the pipe between the outlet end of the temperature regulating valve 304 and the inlet end of the water-using equipment body 303. The first one-way valve 305 allows cold water in the cold water pipe 101 to flow unidirectionally to the temperature regulating valve 304, and the second one-way valve 306 allows hot water in the hot water outlet pipe 104 to flow unidirectionally to the temperature regulating valve 304. The user can adjust the ratio of cold water to hot water entering the temperature regulating valve 304 to flexibly adjust the outlet water temperature of the main body of the water-using equipment 303, ensuring that the outlet water temperature meets the user's needs. For example, the temperature regulating valve 304 can be an electrically controlled automatic regulating valve or a mechanical thermostatic valve; this invention is not limited thereto. For example, the main body of the water-using equipment 303 can be a shower head, faucet, etc.; this invention is not limited thereto.

[0060] In some embodiments of this utility model, the water heater 200 further includes a second wireless communication module 210, which is electrically connected to the water heater controller 209. The water heater controller 209 receives a preheating cycle command through the second wireless communication module 210. In response to the preheating cycle command, the water heater controller 209 controls the circulating water pump 206 and the heating module 207 to start for preheating cycle. For example, the second wireless communication module 210 may be a Bluetooth communication module or a WIFI communication module, which is not limited herein.

[0061] In some embodiments of this utility model, the water heater 200 further includes an inlet water temperature sensor 211 and an outlet water temperature sensor 212, both of which are connected to the hot water controller 209. The inlet water temperature sensor 211 is installed on the cold water inlet pipe 204 to collect the inlet water temperature, and the outlet water temperature sensor 212 is installed on the hot water outlet pipe 205 to collect the outlet water temperature.

[0062] In some embodiments of this utility model, the hot water system may further include a wireless remote control device. The wireless remote control device comprises a wireless communication module and a hot water supply time setting module, which are connected via electrical signals. The hot water supply time setting module can set the set temperature and hot water supply time for the water-using equipment. The wireless remote control device can be an application installed on a mobile phone, or a wired display or wired controller installed on the water heater 200. The wireless remote control device is communicatively connected to the hot water controller 209 in the water heater 200 and the return water controller 106 in the return water device 100 to send a circulating preheating command to these two devices. Since the wireless remote control device is prior art, its structure and working principle will not be described in detail.

[0063] This utility model also provides a hot water system control method, applicable to the hot water system provided in any of the foregoing embodiments of this utility model. Figure 3 A flowchart of a hot water system control method provided by this utility model is shown below. Figure 3 As shown, the hot water system control method includes the following steps:

[0064] S11. When the return water controller of the target return water device receives the circulation preheating command, it controls the switch valve to open, connects the hot water pipe and the cold water pipe, and controls the return water pump to start.

[0065] The target return water device can be any return water device in the hot water system. (Reference) Figure 2 For example, when the return water controller 106 of the return water device 100 receives the circulation preheating command, it controls the switch valve 105 to open, connecting the hot water pipe 102 and the cold water pipe 101, and controls the return water pump 104 to start.

[0066] S12. When the hot water controller receives the circulating preheating command, it controls the circulating water pump to start, obtains the inlet water flow rate collected by the inlet water flow sensor, and compares the inlet water flow rate with the minimum starting flow rate of the water heater to start heating.

[0067] When the hot water controller 209 receives the circulation preheating command, it controls the circulation water pump 206 to start, obtains the inlet water flow (i.e. the circulation preheating water flow) collected by the inlet water flow sensor 208, and compares the inlet water flow with the minimum start-up flow of the water heater 200 to start heating.

[0068] S13. When the inlet water flow rate is greater than the minimum start-up flow rate, the hot water controller controls the heating module to start heating.

[0069] When the inlet water flow rate exceeds the minimum start-up flow rate, the hot water controller 209 controls the heating module 207 to start heating. The cold water in the pipeline flows back to the water heater 200 through the hot water pipe 102, bypass pipe 103, and cold water pipe 101 of the return water device 100. After being heated by the heating module 207, it returns to the return water device 100. This cycle of preheating continues until the water temperature in the pipeline reaches the set temperature or the circulation time reaches the set time. At this point, the hot water controller 209 controls the circulating water pump 206 and the heating module 207 to stop operating, and the return water controller 106 controls the switch valve 105 to close and the return water pump 104 to stop operating.

[0070] In some embodiments of this utility model, such as Figure 2 As shown, the return water device also includes a return water temperature sensor 110. The return water temperature sensor 110 is installed on the hot water pipe 102 between the inlet end 1021 of the hot water pipe 102 and the connection point between the bypass pipe 103 and the hot water pipe 102, or on the bypass pipe 103. The return water temperature sensor 110 is electrically connected to the return water controller 106. The return water temperature sensor 110 is used to collect the water temperature in the hot water pipe 102 or the bypass pipe 103 as the return water temperature and upload it to the return water controller 106. The hot water system control method also includes:

[0071] 1. During the circulating preheating process, the return water controller of the target return water device acquires the return water temperature collected by the return water temperature sensor and compares the return water temperature with the end temperature of the circulating preheating.

[0072] During the circulating preheating process, the return water controller 106 of the target return water device acquires the return water temperature collected by the return water temperature sensor 210 and compares the return water temperature with the end temperature of the circulating preheating. For example, the end temperature of the circulating preheating can be equal to the user's set temperature, or the lowest temperature within a preset range of the set temperature.

[0073] 2. When the return water temperature reaches the end temperature of the circulation preheating, the return water controller controls the switch valve to close and controls the return water pump to stop running.

[0074] As the preheating cycle progresses, the return water temperature gradually increases. When the return water temperature reaches the end temperature of the preheating cycle, the return water controller 106 controls the switch valve 105 to close and the return water pump 104 to stop running, thus cutting off the preheating cycle and ending the preheating cycle. At the same time, the hot water controller 209 controls the circulating water pump 206 and the heating module 207 to stop running.

[0075] In some embodiments of this utility model, such as Figure 2As shown, the return water device also includes a return water flow sensor 109. The return water flow sensor 109 is installed on the hot water pipe 102 between the inlet end 1021 of the hot water pipe 102 and the connection point between the bypass pipe 103 and the hot water pipe 102. The return water flow sensor 109 is electrically connected to the return water controller 106. The return water flow sensor 109 is used to collect the water flow rate in the hot water pipe 102 and upload it to the return water controller 106. The hot water system control method also includes:

[0076] 1. During the water usage process of the target water-using equipment, the return water controller of the target return water device corresponding to the target water-using equipment acquires the water flow rate collected by the return water flow sensor, and compares the water flow rate with the first preset flow rate and the second preset flow rate respectively. During the water usage process of the target water-using equipment, the switch valve remains closed, and the circulating water pump and heating module of the water heater remain in working state.

[0077] For example, the target water-using device can be any water-using device in a hot water system. During the hot water usage process of the water-using device 300, the circulating water pump 206 and heating module 207 of the water heater 200 remain operational, and the switch valve 105 of the return water device remains closed. The hot water generated by the water heater 200 flows to the water-using device 300 through the hot water pipe 102 of the return water device, and mixes with the cold water input from the cold water pipe 101 in the temperature regulating valve 304 of the water-using device 300 before flowing out from the main body 303 of the water-using device. During the water usage process of the water-using device 300, the return water controller 106 of the return water device 100 corresponding to the water-using device 300 acquires the water flow rate collected by the return water flow sensor 109, and compares the water flow rate with a first preset flow rate and a second preset flow rate, respectively. The second preset flow rate is greater than the first preset flow rate.

[0078] 2. When the water flow rate is less than the first preset flow rate, the return water pump should remain in a non-operating state.

[0079] When the water flow rate is less than the first preset flow rate, it indicates that the user's current water flow rate is not high, and the circulating water pump 206 of the water heater 200 can meet the user's water flow rate. Therefore, the return water pump 104 is kept in a non-working state (if the return water pump 104 was previously in a working state, it is controlled to stop working). It should be noted that when the return water pump 104 is in a non-working state, the hot water pipe 102 is still conductive, but the return water pump 104 does not rotate actively.

[0080] 3. When the water flow rate is greater than the second preset flow rate, start the return water pump to pressurize the water output of the target water-using equipment.

[0081] When the water flow rate is greater than the second preset flow rate, it indicates that the user's current water flow rate is too high and the single circulating water pump 206 cannot meet the user's water flow rate. In this case, the return water pump 104 is started to pressurize the water output of the target water-using equipment.

[0082] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0083] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0084] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0085] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A water return device, characterized in that, include: Hot water pipe (102), the inlet end (1021) of the hot water pipe (102) is used to connect to the hot water outlet end (203) of the water heater (200), and the outlet end (1022) of the hot water pipe (102) is used to connect to the hot water inlet end (302) of the water-using equipment (300); A cold water pipe (101) is provided, the inlet end (1011) of which is used to connect the cold water inlet end (201) of the water heater (200) and the cold water supply pipe (202), and the outlet end (1012) of the cold water pipe (101) is used to connect the cold water inlet end (301) of the water-using equipment (300); A bypass pipe (103) is provided between the hot water pipe (102) and the cold water pipe (101) for connecting the hot water pipe (102) and the cold water pipe (101); A return water pump (104) is provided on the hot water pipe (102) between the inlet end (1021) of the hot water pipe (102) and the connection point between the bypass pipe (103) and the hot water pipe (102); A switching valve (105) is disposed on the bypass pipe (103); A return water controller (106) is electrically connected to the return water pump (104) and the switching valve (105).

2. The water return device according to claim 1, characterized in that, It also includes a one-way valve (107), which is disposed on the bypass pipe (103) to allow water from the hot water pipe (102) to flow unidirectionally to the cold water pipe (101) through the bypass pipe (103).

3. The water return device according to claim 1, characterized in that, It also includes a first wireless communication module (108), which is electrically connected to the return water controller (106), and the return water controller (106) receives the circulation preheating command through the first wireless communication module (108).

4. The water return device according to claim 1, characterized in that, It also includes a return water flow sensor (109), which is disposed on the hot water pipe (102) between the inlet end (1021) of the hot water pipe (102) and the connection point between the bypass pipe (103) and the hot water pipe (102). The return water flow sensor (109) is electrically connected to the return water controller (106).

5. The water return device according to claim 1, characterized in that, It also includes a return water temperature sensor (110), which is disposed on the hot water pipe (102) between the inlet end (1021) of the hot water pipe (102) and the connection point between the bypass pipe (103) and the hot water pipe (102), or disposed on the bypass pipe (103). The return water temperature sensor (110) is electrically connected to the return water controller (106).

6. The water return device according to claim 1, characterized in that, It also includes a power module (111), which is electrically connected to the return water pump (104), the switching valve (105) and the return water controller (106) to supply power to the return water pump (104), the switching valve (105) and the return water controller (106).

7. The water return device according to claim 1, characterized in that, It also includes a housing (112) having a receiving cavity, wherein the return water pump (104), the bypass pipe (103), the switch valve (105) and the return water controller (106) are all disposed within the receiving cavity of the housing (112); The housing (112) is provided with a hot water inlet, a hot water outlet, a cold water inlet, and a cold water outlet. The hot water pipe (102) is inserted into the housing (112), and the inlet end (1021) of the hot water pipe (102) extends outward through the hot water inlet, and the outlet end (1022) of the hot water pipe (102) extends outward through the hot water outlet. The cold water pipe (101) is inserted into the housing (112), and the inlet end (1011) of the cold water pipe (101) extends outward through the cold water inlet, and the outlet end (1012) of the cold water pipe (101) extends outward through the cold water outlet.

8. A hot water system, characterized in that, The device includes a water return device (100) as described in any one of claims 1-7, and also includes a water heater (200) and at least one water-using device (300), with each water-using device (300) corresponding to one of the water return devices (100); The inlet end (1021) of the hot water pipe (102) of the return water device (100) is connected to the hot water outlet end (203) of the water heater (200), and the outlet end (1022) of the hot water pipe (102) is connected to the hot water inlet end (302) of the water-using equipment (300). The inlet end (1011) of the cold water pipe (101) of the return water device (100) is connected to the cold water inlet end (201) and the cold water supply pipe (202) of the water heater (200) respectively, and the outlet end (1012) of the cold water pipe (101) is connected to the cold water inlet end (301) of the water-using equipment (300); The water heater (200) includes a cold water inlet pipe (204), a hot water outlet pipe (205), a circulating water pump (206), a heating module (207), an inlet water flow sensor (208), and a hot water controller (209); The water inlet of the heating module (207) is connected to the cold water inlet pipe (204), and the water outlet of the heating module (207) is connected to the hot water outlet pipe (205). The circulating water pump (206) and the inlet flow sensor (208) are both installed on the cold water inlet pipe (204); The circulating water pump (206), the inlet flow sensor (208), and the heating module (207) are all connected to the hot water controller (209).

9. The hot water system according to claim 8, characterized in that, The water heater (200) also includes a second wireless communication module (210), which is electrically connected to the water heater controller (209). The water heater controller (209) receives a preheating cycle command through the second wireless communication module (210).

10. The hot water system according to claim 8, characterized in that, The water heater (200) also includes an inlet water temperature sensor (211) and an outlet water temperature sensor (212). The inlet water temperature sensor (211) is installed on the cold water inlet pipe (204), and the outlet water temperature sensor (212) is installed on the hot water outlet pipe (205). Both the inlet water temperature sensor (211) and the outlet water temperature sensor (212) are electrically connected to the hot water controller (209).

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