Intelligent circulating hot water system for residence large flat layer and villa building

Abstract

The invention relates to an intelligent circulating hot water system for residence large flat floors and villa buildings, and aims to solve the problem of how to improve the water use experience of users and reduce unnecessary energy consumption of a hot water circulating system at the same time. According to the scheme, the system mainly comprises a heat supply unit used for heating entering hot water and comprising a circulating pump; the water supply pipeline comprises a cold water pipeline and a hot water circulating pipeline, the hot water circulating pipeline comprises a hot water pipeline, a hot water return pipeline and a plurality of unit branch pipes, the circulating pump is arranged on the hot water return pipeline, and the two ends of each unit branch pipe are connected with the hot water pipeline and the hot water return pipeline respectively. The unit branch pipes correspond to the water consumption units; for at least part of the water consumption units, the water supply system further comprises a photoelectric sensor arranged in the water consumption unit space; the cut-off valves are arranged on the unit branch pipes; and the temperature sensors are arranged on the unit branch pipes.

Description

Technical Field

[0001] The invention belongs to the technical field of indoor water use, and in particular relates to an intelligent circulating hot water system for large residential flats and villa buildings. Background Art

[0002] With the development of cities, people's demand for improving the quality of life is increasing, especially the living facilities in homes, such as the water supply system, which has higher and higher requirements for experience.

[0003] Generally speaking, in large flats and multi-storey buildings, such as large villas, in order to shorten the time for hot water to come out and improve the hot water experience, in existing designs, the water supply pipelines in the hot water supply system often use various hot water pipes and various water-using devices in series to establish an integrated hot water large circulation pipeline. However, there are some problems with the commonly used large circulation pipelines: 1) Hot water is a whole large system. If the owner wants to close the cold water and hot water valves of several bathrooms because there are few people living there, this cannot be achieved. The hot water system must fill all hot water pipes with hot water to ensure the timely supply of hot water. The buried (embedded in the wall) pipes cannot be equipped with an insulation layer. This part of the hot water pipe will continuously dissipate heat to the environment. In the end, the water heater is required to replenish this part of the lost heat in time, which increases the energy consumption of the hot water system. The hot water pipe is long and the resistance loss is large. The length of the cold water pipe at each water-using device is not balanced with the length of the hot water pipe. When the hot water volume (cold water volume) fluctuates, pressure imbalance may occur, resulting in unstable water outlet temperature.

[0004] In summary, it is difficult to balance the contradiction between poor user water experience and high system energy consumption in the prior art. The purpose of the present invention is to provide an intelligent circulating hot water system for large residential flats and villa buildings to improve user water experience while reducing unnecessary energy consumption of the hot water circulation system. Summary of the invention

[0005] In view of the above analysis, the embodiments of the present invention are to solve the problem of how to improve the user's water use experience while reducing unnecessary energy consumption of the hot water circulation system.

[0006] Provided is an intelligent circulating hot water system for large residential flats and villa buildings, comprising a plurality of water-using units, each of which has at least one water-using appliance, including:

[0007] A heating unit, used to heat the incoming hot water, including a circulation pump;

[0008] Water supply pipelines, including cold water pipelines and hot water circulation pipelines;

[0009] The cold water pipeline includes a cold water main pipe and a plurality of cold water branches, and the cold water main pipe is connected to the water-using appliances in the corresponding water-using units through each of the cold water branches;

[0010] The hot water circulation pipeline includes a hot water pipeline, a hot water return pipeline and a plurality of unit branches, the hot water pipeline is connected to each of the water units from the outlet of the heating unit, the hot water return pipeline is connected to each of the water units from the inlet of the heating unit, the circulation pump is arranged on the hot water return pipeline, the two ends of the unit branch are respectively connected to the hot water pipeline and the hot water return pipeline, and the unit branch corresponds to the water unit;

[0011] Wherein, for at least part of the water use units, it also includes:

[0012] A photoelectric sensor is arranged in the water-using unit space;

[0013] A cut-off valve is provided on the branch pipe of the unit;

[0014] A temperature sensor is arranged on the unit branch pipe;

[0015] The intelligent circulating hot water system for large residential flats and villa buildings also includes a controller, which is respectively communicated with the circulating pump, the photoelectric sensor, the shut-off valve and the temperature sensor. The controller is configured to control the switching of the circulating pump and the shut-off valve according to a set mode or based on information on whether there is someone using the water unit and / or hot water temperature information. The information on whether there is someone using the water unit is determined by the photoelectric sensor, and the hot water temperature information is obtained by the temperature sensor.

[0016] In some embodiments, the controlling of the circulation pump and the shutoff valve based on the information of whether there is someone using the water unit and / or the hot water temperature information includes:

[0017] If it is detected that there is someone in the first water-using unit, the water temperature of the branch pipe of the first water-using unit is obtained through the temperature sensor;

[0018] If the water temperature is lower than the set temperature T°C, the circulation pump is started until the water temperature reaches T+2°C.

[0019] In some embodiments, during the start-up of the circulation pump, if it is detected that no one is in other water use units, the shut-off valves in other water use units are controlled to close to circulate and heat the water temperature of the first water use unit alone.

[0020] In some embodiments, the controlling of the circulation pump and the shutoff valve based on the information of whether there is someone using the water unit and / or the hot water temperature information includes:

[0021] Acquire the water temperature in the unit branch pipes of all water-using units through each temperature sensor;

[0022] If the water temperature of only some of the second water-using units is lower than the set temperature, the circulation pump is turned on, and the controller controls the shut-off valves of other water-using units to be closed, so as to circulate and heat only the water temperature of the second water-using units.

[0023] In some embodiments, the heating unit includes a heating device and a heat storage device, the water inlet of the heating unit is connected to the hot water return pipeline, the cold water pipeline is connected to the water inlet of the heating unit through the hot water return pipeline, the water outlet of the heating unit is connected to the water inlet of the heat storage device, and the water outlet of the heat storage device is connected to the hot water pipeline;

[0024] The heat storage device is provided with a temperature sensor T-0.

[0025] In some embodiments, a check valve and a flow switch are provided on the pipeline between the cold water pipeline and the hot water return pipeline, and the flow switch is used to feed back an electrical signal based on the water flow to the controller.

[0026] In some embodiments, a plurality of hot water branch pipes are provided on the unit branch pipe, and the unit branch pipes are respectively connected to water-using appliances in corresponding water-using units through each hot water branch pipe.

[0027] In some embodiments, a first shut-off valve is provided on one end of the unit branch pipe close to the hot water pipeline, and a second shut-off valve is provided on one end of the unit branch pipe close to the hot water return pipeline, and the connection point between the hot water branch pipe and the unit branch pipe is located between the first shut-off valve and the second shut-off valve.

[0028] In some embodiments, the hot water pipeline is connected to each of the water use units in a first order starting from the heating unit, and the hot water return pipeline is connected to each of the water use units in a second order starting from the heating unit, and the second order is the reverse order of the first order.

[0029] In some embodiments, the setting mode includes one of a first mode, a second mode, a third mode, a fourth mode, and a fifth mode;

[0030] The first mode includes: starting the circulation pump and switching to a mode before entering the first mode after a first set time period;

[0031] The second mode includes: setting multiple time periods, setting a first cycle of a first specific time length within the set time period, and starting a circulation pump in each first cycle if the temperature sensor determines that the water temperature of a water-using unit is lower than the set temperature T°C, until the temperature sensors of all water-using units return values ​​of T+2°C;

[0032] The third mode includes: setting a second cycle of a second specific time length, according to the triggering time period of the flow switch in the previous second cycle, the controller starts the circulation pump in the corresponding time period in the current second cycle based on the triggering time period;

[0033] The fourth mode includes: constantly monitoring the water temperature of each water-using unit, and if the water temperature of any water-using unit is lower than the set temperature T°C, starting the circulation pump until the temperature sensors of all water-using units return values ​​of T+2°C;

[0034] The fifth mode includes: if the water temperature in the heat storage device is lower than T°C, starting the circulation pump until the water temperature in the heat storage device reaches T+5°C.

[0035] The above embodiments of the present invention have at least the following beneficial effects:

[0036] The embodiment of the present invention can obtain information about whether there is someone in the water unit through a photoelectric sensor, obtain hot water temperature information through the temperature sensor, and control the switching of the circulation pump and the shut-off valve based on the information about whether there is someone in the water unit and / or the hot water temperature information. Refined and targeted circulation heating control can be performed on each water unit. On the one hand, the user's hot water usage needs can be quickly met, and on the other hand, unnecessary pipe circulation can be avoided to reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0038] Figure 1 A schematic diagram of the structure of an intelligent circulating hot water system for large residential flats and villa buildings provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments disclosed in this disclosure can be combined, separated, interchanged and / or rearranged with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0041] The present disclosure is described below through several specific embodiments. In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits the detailed description of known functions and known components. Figure 1 The present invention provides an intelligent circulating hot water system for large residential flats and villa buildings, which has multiple water units, such as Figure 1 The water-using units 1 to n in the embodiment include at least one water-using appliance, including:

[0042] The heating unit 100 is used to heat incoming hot water and includes a circulation pump 105 .

[0043] The water supply pipeline 200 includes a cold water pipeline 201 and a hot water circulation pipeline.

[0044] The cold water pipeline 201 includes a cold water main pipe and a plurality of cold water branches, wherein the cold water main pipe is connected to water-using appliances in corresponding water-using units through the cold water branches. Preferably, the cold water branches may also have multiple branches.

[0045] The hot water circulation pipeline includes a hot water pipeline 202, a hot water return pipeline 203 and a plurality of unit branches. The hot water pipeline 202 is connected to each of the water-using units from the outlet of the heating unit 100, and the hot water return pipeline 203 is connected to each of the water-using units from the inlet of the heating unit 100. The circulation pump 105 is arranged on the hot water return pipeline 203, and the two ends of the unit branch pipe are respectively connected to the hot water pipeline 202 and the hot water return pipeline 203, and the unit branch pipe corresponds to the water-using unit. The circulation pump 105 is only arranged on the hot water return pipeline 203, so as to avoid the hot water being added to the cold water pipeline due to improper installation with the cold water pipe, thereby polluting the water temperature of the cold water.

[0046] In addition, the present invention can control each water-using unit individually. For example, a toilet can be used as a unit that can perform circulation heating individually, and the hot water supply and hot water return of this unit can be controlled by setting valves.

[0047] Wherein, for at least part of the water use units, it also includes:

[0048] A photoelectric sensor is arranged in the water unit space, such as Figure 1 G-1~n in;

[0049] A cut-off valve 204 is provided on the unit branch pipe;

[0050] The temperature sensor is arranged on the branch pipe of the unit, such as Figure 1 In T-1-n, preferably, the temperature sensor is arranged on one end of the unit branch pipe close to the hot water return pipe 203. This setting point is a temperature weak point that is further away from the water supply end for the water-using unit.

[0051] The intelligent circulating hot water system for large residential flats and villa buildings also includes a control part 300, which includes a controller 301. The controller 301 is respectively communicated with the circulating pump 105, the photoelectric sensor, the shut-off valve 204 and the temperature sensor. The controller 301 is configured to control the switching of the circulating pump 105 and the shut-off valve 204 according to a set mode or based on information on whether there is someone in the water use unit and / or hot water temperature information. The information on whether there is someone in the water use unit is determined by the photoelectric sensor, and the hot water temperature information is obtained by the temperature sensor.

[0052] It should be understood that the water-using units are, for example, multiple rooms, toilets, and washrooms in a large apartment, and the water-using appliances are, for example, shower heads, toilets, kitchen faucets, etc. in each room.

[0053] In some embodiments, the control of the circulation pump 105 and the shutoff valve 204 based on the information of whether there is someone using the water unit and / or the hot water temperature information includes:

[0054] If it is detected that there is someone in the first water-using unit, the water temperature of the branch pipe of the first water-using unit is obtained through the temperature sensor;

[0055] If the water temperature is lower than the set temperature T°C, the circulation pump 105 is started until the water temperature reaches T+2°C.

[0056] For example, when someone enters the sensing range of the photoelectric sensor of the bathroom, the sensor outputs an electrical signal to the controller 301, and the controller 301 detects whether the temperature of the temperature probe of the bathroom reaches T°C. If it is lower than the set temperature T°C, the circulation pump 1050 is started. When the temperature probe of the bathroom reaches the design temperature T+2°C, the circulation pump 105 is stopped.

[0057] In some embodiments, during the start-up of the circulation pump 105, if it is detected that no one is in other water-using units, the shut-off valves 204 in other water-using units are controlled to close to circulate and heat the water temperature of the first water-using unit alone.

[0058] At this time, after the temperature probe detects the temperature of the most unfavorable point of this unit, and the temperature probes of other units are at the appropriate temperature, only the solenoid valve on the hot water supply pipe of this unit is opened, and only the hot water pipe of this unit is circulated, which can achieve more precise control requirements. On the one hand, it can heat the current water-using unit more quickly, improving the user experience, and on the other hand, it can avoid other units that do not need to be heated from participating in the circulation, causing heat waste.

[0059] In some embodiments, the control of the circulation pump 105 and the shutoff valve 204 based on the information of whether there is someone using the water unit and / or the hot water temperature information includes:

[0060] Acquire the water temperature in the unit branch pipes of all water-using units through each temperature sensor;

[0061] If the water temperature of only some of the second water-using units is lower than the set temperature, the circulation pump 105 is turned on, and the controller 301 controls the shut-off valves 204 of other water-using units to be closed, so as to circulate and heat only the water temperature of the second water-using units.

[0062] In some embodiments, the heating unit 100 includes a heating device 101 and a heat storage device 102, the water inlet of the heating unit is connected to the hot water return pipe 203, the cold water pipe 201 is connected to the water inlet of the heating unit through the hot water return pipe 203, the water outlet of the heating unit is connected to the water inlet of the heat storage device 102, and the water outlet of the heat storage device 102 is connected to the hot water pipe 202;

[0063] The heat storage device 102 is provided with a temperature sensor.

[0064] In some embodiments, a check valve 104 and a flow switch 103 are provided on the pipeline between the cold water pipeline 201 and the hot water return pipeline 203 . The flow switch 103 is used to feed back an electrical signal based on the water flow to the controller 301 .

[0065] This flow switch 103 can accurately monitor the water replenishment of the hot water system. The hot water system is a closed system. If a hot water valve is activated at a water point, cold water must be replenished to the hot water system, that is, the water use of the hot water system can be more accurately monitored.

[0066] In some embodiments, the unit branch pipe is provided with a plurality of hot water branch pipes, and the unit branch pipes are connected to the water-using appliances in the corresponding water-using units through the hot water branch pipes. Preferably, the hot water branch pipe and the cold water branch pipe are both connected to the mixing valve before the water-using appliances.

[0067] In some embodiments, a first shutoff valve 204 is provided on one end of the unit branch pipe close to the hot water pipeline 202, a second shutoff valve 204 is provided on one end of the unit branch pipe close to the hot water return pipeline 203, and the connection point between the hot water branch pipe and the unit branch pipe is located between the first shutoff valve 204 and the second shutoff valve 204. By providing the front and rear two shutoff valves 204, the water-using unit can be completely shut off.

[0068] In some embodiments, the hot water pipeline 202 is connected to each of the water-using units in a first order starting from the heating unit 100, and the hot water return pipeline 203 is connected to each of the water-using units in a second order starting from the heating unit 100, and the second order is the reverse order of the first order. With such an arrangement, for each water-using unit, the hot water circulation pipeline is arranged in the same route, which is conducive to the temperature balance of each water-using unit. At the same time, for this water-using unit, the ratio of the cold water pipeline and the hot water pipeline is closer than that of the large circulation mode, avoiding the problem of uneven cold and hot water pressure for some water-using units.

[0069] In some embodiments, the setting mode includes one of a first mode, a second mode, a third mode, a fourth mode, and a fifth mode;

[0070] The first mode includes: starting the circulation pump 105 and switching to the mode before entering the first mode after a first set time period; the first set time period is, for example, five minutes.

[0071] The second mode includes: setting multiple time periods, setting a first cycle of a first specific time length within the set time period, and starting the circulation pump 105 if the temperature sensor determines that the water temperature of a water-using unit is lower than the set temperature T°C in each first cycle, until the temperature sensor return values ​​of all water-using units are T+2°C; multiple time periods such as 7:05-8:10, 11:30-12:35, 17:10-18:40, 20:30-21:05, 22:55-23:50, etc., 10 (assumed) time periods can be set in the early stage, with each 5 minutes as the first cycle, and within the set time period, if the temperature of a unit's temperature probe is lower than T°C, starting the circulation pump 105. When the temperature of the temperature probes of all units reaches T+2°C, the circulation pump 105 stops working.

[0072] The third mode includes: setting a second cycle of a second specific time length, according to the trigger time period of the flow switch 103 in the previous second cycle, the controller 301 starts the circulation pump 105 in the corresponding time period in the current second cycle based on the trigger time period; the second specific time length is, for example, one week. For example: in the first week, the start signal and corresponding time of the flow switch 103 are recorded, which can be used as the time when the user uses hot water. If the user uses water in the range of 7:00-9:00 and 20:00-22:00, then record it as the working period of the circulation pump 105, and in the second week, according to the working period learned in the first week, start the circulation pump 105 so that the temperature probe of each unit reaches the design temperature. At this time, the water flow signal and start time of the flow switch 103 in the second week are recorded at the same time. In the third week, the working period of the circulation pump 105 in the third week is determined according to the start time recorded in the previous week. In this mode, there is a reset signal to clear the recorded learning content.

[0073] The fourth mode includes: constantly monitoring the water temperature of each water-using unit, and if the water temperature of any water-using unit is lower than the set temperature T°C, starting the circulation pump 105 until the temperature sensor return values ​​of all water-using units are T+2°C;

[0074] The fifth mode includes: if the water temperature in the heat storage device 102 is lower than T°C, starting the circulation pump 105 until the water temperature in the heat storage device 102 reaches T+5°C.

[0075] The embodiment of the present invention can obtain information about whether there is someone in the water unit through a photoelectric sensor, obtain hot water temperature information through the temperature sensor, and control the switching of the circulation pump and the shut-off valve based on the information about whether there is someone in the water unit and / or the hot water temperature information. Refined and targeted circulation heating control can be performed on each water unit. On the one hand, the user's hot water usage needs can be quickly met, and on the other hand, unnecessary pipe circulation can be avoided to reduce energy consumption.

[0076] The professionals should further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0077] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0078] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An intelligent circulating hot water system for large residential flats and villa buildings, having multiple water-using units, each of which has at least one water-using appliance, characterized in that: include: A heating unit, used to heat the incoming hot water, including a circulation pump; Water supply pipelines, including cold water pipelines and hot water circulation pipelines; The cold water pipeline includes a cold water main pipe and a plurality of cold water branches, and the cold water main pipe is connected to the water-using appliances in the corresponding water-using units through each of the cold water branches; The hot water circulation pipeline includes a hot water pipeline, a hot water return pipeline and a plurality of unit branches, the hot water pipeline is connected to each of the water units from the outlet of the heating unit, the hot water return pipeline is connected to each of the water units from the inlet of the heating unit, the circulation pump is arranged on the hot water return pipeline, the two ends of the unit branch are respectively connected to the hot water pipeline and the hot water return pipeline, and the unit branch corresponds to the water unit; Wherein, for at least part of the water use units, it also includes: A photoelectric sensor is arranged in the water-using unit space; A cut-off valve is provided on the unit branch pipe; A temperature sensor is arranged on the unit branch pipe; The intelligent circulating hot water system for large residential flats and villa buildings also includes a controller, which is respectively communicated with the circulating pump, the photoelectric sensor, the shut-off valve and the temperature sensor. The controller is configured to control the switching of the circulating pump and the shut-off valve according to a set mode or based on information on whether there is someone using the water unit and / or hot water temperature information. The information on whether there is someone using the water unit is determined by the photoelectric sensor, and the hot water temperature information is obtained by the temperature sensor.

2. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 1 is characterized by: The method of controlling the switching of the circulation pump and the cut-off valve based on the information of whether someone is using the water unit and / or the hot water temperature information comprises: If it is detected that there is someone in the first water-using unit, the water temperature of the branch pipe of the first water-using unit is obtained through the temperature sensor; If the water temperature is lower than the set temperature T°C, the circulation pump is started until the water temperature reaches T+2°C.

3. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 2 is characterized by: During the start-up of the circulation pump, if it is detected that no one is in other water-using units, the shut-off valves in other water-using units are controlled to close so as to circulate and heat the water temperature of the first water-using unit alone.

4. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 1 is characterized by: The method of controlling the switching of the circulation pump and the cut-off valve based on the information of whether someone is using the water unit and / or the hot water temperature information comprises: Acquire the water temperature in the unit branch pipes of all water-using units through each temperature sensor; If the water temperature of only some of the second water-using units is lower than the set temperature, the circulation pump is turned on, and the controller controls the shut-off valves of other water-using units to be closed, so as to circulate and heat only the water temperature of the second water-using units.

5. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 1 is characterized by: The heating unit includes a heating device and a heat storage device, the water inlet of the heating unit is connected to the hot water return pipeline, the cold water pipeline is connected to the water inlet of the heating unit through the hot water return pipeline, the water outlet of the heating unit is connected to the water inlet of the heat storage device, and the water outlet of the heat storage device is connected to the hot water pipeline; A temperature sensor is provided in the heat storage device.

6. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 5 is characterized by: A check valve and a flow switch are provided on the pipeline between the cold water pipeline and the hot water return pipeline, and the flow switch is used to feed back an electrical signal based on the water flow to the controller.

7. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 1 is characterized by: The unit branch pipes are provided with a plurality of hot water branch pipes, and the unit branch pipes are respectively connected with water-using appliances in corresponding water-using units through the hot water branch pipes.

8. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 7 is characterized by: A first shut-off valve is provided on one end of the unit branch pipe close to the hot water pipeline, and a second shut-off valve is provided on one end of the unit branch pipe close to the hot water return pipeline. The connection point between the hot water branch pipe and the unit branch pipe is located between the first shut-off valve and the second shut-off valve.

9. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 1 is characterized by: The hot water pipeline is connected to each of the water use units in a first order starting from the heating unit, and the hot water return pipeline is connected to each of the water use units in a second order starting from the heating unit, and the second order is the reverse order of the first order.

10. The intelligent circulating hot water system for large residential flats and villa buildings according to claim 6 is characterized by: The setting mode includes one of a first mode, a second mode, a third mode, a fourth mode and a fifth mode; The first mode includes: starting the circulation pump and switching to a mode before entering the first mode after a first set time period; The second mode includes: setting multiple time periods, setting a first cycle of a first specific time length within the set time period, and starting a circulation pump in each first cycle if the temperature sensor determines that the water temperature of a water-using unit is lower than the set temperature T°C, until the temperature sensors of all water-using units return values ​​of T+2°C; The third mode includes: setting a second cycle of a second specific time length, according to the triggering time period of the flow switch in the previous second cycle, the controller starts the circulation pump in the corresponding time period in the current second cycle based on the triggering time period; The fourth mode includes: constantly monitoring the water temperature of each water-using unit, and if the water temperature of any water-using unit is lower than the set temperature T°C, starting the circulation pump until the temperature sensors of all water-using units return values ​​of T+2°C; The fifth mode includes: if the water temperature in the heat storage device is lower than T°C, starting the circulation pump until the water temperature in the heat storage device reaches T+5°C.

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