Energy-saving control method and system and water heater zero cold water system

Abstract

The present invention belongs to the technical field of water heaters, and specifically discloses an energy-saving control method and system and a water heater zero cold water system, wherein the energy-saving control method comprises the following steps: S1, controlling the operation of a circulating water pump, and controlling the operation of a heat exchanger of the water heater to start circulating preheating; S2, when it is detected that the water temperature at a preset position point in the circulating pipeline is greater than or equal to a first preset temperature T 1 After that, the circulation pipeline is controlled to be closed at a preset position point, and the preset position point is located between the connection point between the circulation pipeline and the cold water interface of the water-using end and the connection point between the circulation pipeline and the hot water interface of the water-using end. The present invention sets a preset position point on the circulation pipeline, and controls the on-off of the circulation pipeline according to the temperature at the preset position point. When the water heater starts to circulate, the hot water only circulates half a circle in the circulation pipeline, thereby solving the problem of energy waste caused by the water in the circulation pipeline between the water-using end and the water inlet of the water heater being heated in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to an energy-saving control method and system and a zero-cold water system for water heaters. Background Art

[0002] In the prior art, for water heaters with zero cold water function, service personnel will generally find the faucet at the farthest end of the water circuit in the home during installation, and connect the hot water pipe with the cold water pipe under this faucet. In addition, in order to prevent cold water from flowing back into the hot water pipe when using hot water, a one-way valve will be installed here. In this way, the user's home pipe forms a zero cold water preheating circulation pipe.

[0003] The working principle of zero cold water is: when the user is not using hot water, the water heater detects that the temperature of its water outlet is lower than the set temperature and starts the circulating water pump in the water heater. After the water pump is running, the water in the circulating pipeline will flow into the water heater for heating. The water pump will not stop running until the water in the entire circulating pipeline is heated, and the water heater will also stop burning at the same time. Then when the user uses hot water for the first time, because the pipeline has been preheated in advance, the faucet will output hot water very quickly, thus realizing the zero cold water function.

[0004] This preheating method is energy-consuming because the entire circulation pipeline is heated. In particular, the water in the circulation pipeline from the rear end of the one-way valve to the water inlet of the water heater cannot flow out when the user uses hot water, and this section of hot water will flow out when the user uses cold water, causing trouble to the user (when using cold water, there is a section of hot water in front), so the water in this section of the pipe does not need to be preheated. Therefore, it is necessary to use certain devices and control methods to make the water heater only preheat the section of the pipeline from the water outlet of the water heater to the faucet at the end, so as to achieve the effect of saving energy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the circulation pipeline between the water end and the water inlet of the water heater is heated, resulting in energy waste, and to provide an energy-saving control method and system and a water heater zero cold water system.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] An energy-saving control method is used for a water heater zero-cold water system, wherein a circulation pipeline is connected between the water inlet and the water outlet of the water heater, and a circulation water pump is arranged on the water inlet pipeline of the water heater. The energy-saving control method comprises the following steps:

[0008] S1, controlling the operation of the circulating water pump and the operation of the heat exchanger of the water heater to start circulating preheating;

[0009] S2. When it is detected that the water temperature at a preset position point in the circulation pipeline is greater than or equal to a first preset temperature T1, the circulation pipeline is controlled to be closed at the preset position point, and the preset position point is located between the connection point between the circulation pipeline and the cold water interface at the water use end and the connection point between the circulation pipeline and the hot water interface at the water use end.

[0010] In the present solution, a preset position point is set on the circulation pipeline, and the circulation pipeline is divided into two parts at the preset position point. The circulation pipeline is controlled to be on and off according to the temperature at the preset position point. When the water heater starts to circulate, the water heated by the heat exchanger of the water heater flows into the circulation pipeline, and the temperature at the preset position point rises from room temperature to a first preset temperature, indicating that the heated water just flows to the preset position point of the circulation pipeline. At this time, the circulation pipeline is closed, and the water in the circulation pipeline no longer flows, that is, from the beginning of the circulation of the water heater to the end of the circulation, the water in the circulation pipeline only circulates half a circle, and the water in the circulation pipeline between the water use end and the water inlet of the water heater is still cold water, which solves the problem of energy waste caused by the heating of the water in the circulation pipeline between the water use end and the water inlet of the water heater in the prior art, and no hot water will flow out when the water use end uses cold water.

[0011] Preferably, the energy-saving control method further comprises the following steps:

[0012] S3, controlling the circulating water pump to stop running, and controlling the heat exchanger of the water heater to stop running.

[0013] In this solution, after the circulation pipeline is closed at a preset position, the water flow in the circulation pipeline no longer continues to circulate. At this time, there is no need to heat the water in the circulation pipeline. Therefore, controlling the circulation water pump and the heat exchanger to stop running can avoid energy waste.

[0014] Preferably, the energy-saving control method further comprises the following steps:

[0015] S4. After the preset preheating interval time is reached, the circulation pipeline is controlled to be reconnected at a preset position point.

[0016] In this solution, after a period of time, the temperature of hot water in the circulation pipeline will gradually drop. In order to achieve the effect of zero cold water, the water in the circulation pipeline needs to be reheated. The reconnection of the circulation pipeline is controlled by the preset preheating interval time. This is one of the control methods for the reconnection of the circulation pipeline.

[0017] Preferably, the energy-saving control method further comprises the following steps:

[0018] S4. When it is detected that the water temperature at a preset position point in the circulation pipeline is lower than a second preset temperature T2, the circulation pipeline is controlled to be reconnected at the preset position point, wherein the first preset temperature T1 is higher than the second preset temperature T2.

[0019] In this solution, the reconnection of the circulation pipeline is controlled by temperature, which is another control method for the reconnection of the circulation pipeline.

[0020] Preferably, in step S3, the control condition for the circulating water pump to stop operating is q<q0,

[0021] Among them, q is the flow value in the circulation pipeline, and q0 is the preset flow value.

[0022] In this solution, the flow rate is detected to determine whether the circulation pipeline is closed at a preset position point, thereby controlling the water pump to stop running. This is one of the control methods for stopping the circulation water pump.

[0023] Preferably, in step S3, the control condition for stopping the operation of the circulating water pump is that when a closing action of the circulating pipeline is detected at a preset position point, the circulating water pump is controlled to stop operating.

[0024] In this solution, whether the circulation pipeline is closed at a preset position is determined by detecting whether there is a closing action in the circulation pipeline, thereby controlling the water pump to stop running. This is another control method for stopping the circulation water pump.

[0025] The present invention also provides an energy-saving control system for a water heater zero-cold water system, wherein the water heater zero-cold water system comprises a circulation pipeline, and the energy-saving control system comprises:

[0026] A temperature detection module, the temperature detection module is used to detect the water temperature value at a preset position point in the circulation pipeline, the preset position point is located between the connection point of the circulation pipeline with the cold water interface of the water-using end and the connection point of the circulation pipeline with the hot water interface of the water-using end;

[0027] A circulation pipeline cut-off module, the circulation pipeline cut-off module is used to open or close the water flow channel of the circulation pipeline at a preset position point;

[0028] A control module, wherein the control module is respectively connected to the temperature detection module, the circulation pipeline cut-off module, the circulation water pump of the water heater and the heat exchanger of the water heater, and the control module is used to control the circulation pipeline cut-off module to close the water flow channel of the circulation pipeline at a preset position point when the water temperature value transmitted by the temperature detection module reaches a first preset water temperature, and control the circulation water pump of the water heater and the heat exchanger of the water heater to stop operating.

[0029] Preferably, the energy-saving control system further comprises a timing module, which is connected to the control module, and the control module controls the circulation pipeline cut-off module to open according to the timing data transmitted by the timing module so as to open the water flow channel at a preset position point.

[0030] In this solution, the timing module is used to time and control the reconnection of the circulation pipeline after the preset time is reached. This is one of the control methods for reconnecting the circulation pipeline.

[0031] Preferably, the energy-saving control system also includes a water flow detection module, which is connected to the control module and is used to detect the water flow in the circulation pipeline. The control module controls the circulating water pump of the water heater and the heat exchanger of the water heater to stop operating according to the water flow data transmitted by the water flow detection module.

[0032] In this solution, the water flow in the circulation pipeline is detected by a water flow detection module. When the detected water flow is less than the preset water flow, it indicates that the circulation pipeline is closed. This is one of the control methods for stopping the circulation water pump and the heat exchanger.

[0033] Preferably, the water flow detection module is arranged between a preset position point of the circulation pipeline and a water inlet of the water heater.

[0034] In this solution, when the circulation pipeline is closed at a preset position, the water flow in the part of the circulation pipeline between the preset position and the water inlet of the water heater is sharply reduced. Therefore, a water flow detection module is set in this section to more accurately detect whether the water flow in the circulation pipeline is reduced.

[0035] The present invention also provides a water heater zero cold water system, which comprises:

[0036] Water heater;

[0037] A circulation pipeline, the two ends of which are respectively connected to the water inlet and the water outlet of the water heater;

[0038] A circulation pipeline cut-off device, the circulation pipeline cut-off device is arranged on the circulation pipeline, the circulation pipeline at least comprises a first portion and a second portion, the first portion is the portion of the circulation pipeline located between the water outlet of the water heater and the circulation pipeline cut-off device, the second portion is the portion of the circulation pipeline located between the water inlet of the water heater and the circulation pipeline cut-off device, the circulation pipeline cut-off device comprises a temperature sensor and a switch element, the circulation pipeline cut-off device can open and close the switch element according to the temperature in the circulation pipeline detected by the temperature sensor to connect or cut off the first portion and the second portion;

[0039] At least one water pipe is provided with a water end, and the two ends of the water pipe are respectively connected to the first part and the second part of the circulation pipe.

[0040] Preferably, the switch element is located on a side of the temperature sensor close to the water inlet of the water heater.

[0041] In this solution, the temperature sensor is located upstream of the switch element, which can prevent the heated water from flowing downstream of the switch element, thereby avoiding the waste of hot water as much as possible.

[0042] Preferably, the switch element is a solenoid valve.

[0043] In this solution, a solenoid valve is used to open and close the circulation pipeline at a preset position point, and the opening and closing process is simple and fast.

[0044] Preferably, the circulation pipeline cutting device also includes a one-way valve, which is located on a side of the switch component away from the temperature sensor, and the flow direction of the one-way valve is from the water outlet to the water inlet of the water heater.

[0045] In this solution, the one-way valve can prevent the cold water in the circulation pipeline located downstream of the circulation pipeline cutting device from flowing back to the water-using end, causing the problem of cold water flowing out when the water-using end uses hot water.

[0046] Preferably, the circulation pipeline cutting device also includes a valve body, the temperature sensor and the switch element are both arranged in the valve body, a flow channel is arranged in the valve body, the flow channel is connected to the circulation pipeline, the switch element can open or close the flow channel, and the one-way valve is arranged in the flow channel.

[0047] In this solution, a valve body structure is provided separately, and the temperature sensor and the switch are installed in the valve body, so as to facilitate the installation of the circulation pipeline cut-off device as a whole on the circulation pipeline.

[0048] Preferably, a partition is further provided in the valve body, the partition divides the flow channel into two parts, the two parts of the flow channel are connected via a through hole provided on the partition, and the through hole can be blocked and exposed by extending and retracting the actuator of the switch member.

[0049] In this solution, the circulation pipeline can be turned on and off by extending and retracting the actuator of the switch piece, and the execution process is simple and fast.

[0050] The positive and progressive effects of the present invention are:

[0051] The present invention sets a preset position point on the circulation pipeline, and controls the on-off of the circulation pipeline according to the temperature at the preset position point. When the water heater starts to circulate, the heated water flows into the circulation pipeline and only circulates half a circle in the circulation pipeline. There is hot water upstream of the preset position point and cold water downstream. When the hot water is turned on at the water end, the hot water flowing out is the hot water upstream of the preset position point. Therefore, the problem of energy waste caused by the heating of water in the circulation pipeline between the water end and the water inlet of the water heater in the prior art is solved, and when cold water is used at the water end, no hot water will flow out. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 Schematic diagram of the structure of the zero-cold water system of the water heater according to Example 1 of the present invention.

[0053] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the Zhongzero cold water circulation connecting valve.

[0054] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the Zhongzero cold water circulation connection valve.

[0055] Figure 4 for Figure 2 Cross-sectional view along the axial direction of the valve body, with the solenoid valve in the closed state.

[0056] Figure 5 for Figure 2 Cross-sectional view along the axial direction of the valve body, with the solenoid valve in the open state.

[0057] Figure 6 Schematic diagram of a module of an energy-saving control system according to Embodiment 2 of the present invention.

[0058] Figure 7 Schematic diagram of a module of an energy-saving control system according to Embodiment 3 of the present invention.

[0059] Figure 8 Flow chart of an energy-saving control method according to Embodiment 4 of the present invention.

[0060] Description of reference numerals:

[0061] Embodiment 1:

[0062] Zero cold water circulation connection valve 100

[0063] Valve body 110

[0064] Runner 111

[0065] Partition 112

[0066] Through hole 1120

[0067] Temperature sensor 120

[0068] Solenoid valve 130 Solenoid valve coil 131 Closing cover 132

[0069] Return spring 133 O-ring 134

[0070] Valve core 135 solenoid valve controller 136 check valve 140

[0071] Control assembly 200

[0072] Water end 300

[0073] Water pipeline 301

[0074] Water heater 400

[0075] Water Inlet 401

[0076] Water outlet 402

[0077] Circulating water pump 403

[0078] Heat exchanger 404 water pipe 500 circulation pipe 600

[0079] Embodiment 2:

[0080] Control module 200 Temperature detection module 120 Circulation pipeline cut-off module 130 Flow detection module 202

[0081] Embodiment 3:

[0082] Timing module 201 DETAILED DESCRIPTION

[0083] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0084] Example 1

[0085] Please refer to Figure 1 This embodiment provides a water heater zero cold water system, which includes a water heater 400, a circulation pipeline 600, a circulation pipeline cutting device and at least one water pipeline 301.

[0086] The two ends of the circulation pipeline 600 are respectively connected to the water inlet 401 and the water outlet 402 of the water heater 400, and the tap water pipe 500 is also connected to the water inlet 401 of the water heater 400. The circulation pipeline cut-off device is arranged on the circulation pipeline 600, and the circulation pipeline cut-off device divides the circulation pipeline 600 into two parts, the first part is the part of the circulation pipeline 600 located between the water outlet 402 of the water heater 400 and the circulation pipeline cut-off device, and the second part is the part of the circulation pipeline 600 located between the water inlet 401 of the water heater 400 and the circulation pipeline cut-off device. The circulation pipeline cut-off device can realize the opening and closing of the circulation pipeline 600 at this point, so as to connect or cut off the first part and the second part.

[0087] The water pipe 301 may be one or more, the hot water interface of each water pipe 301 is connected to the first part of the circulation pipe 600, and the cold water interface of each water pipe 301 is connected to the second part of the circulation pipe 600. The water pipe 301 is provided with a water end 300, which may be a water outlet component such as a faucet or a shower head.

[0088] The circulating pipeline cutting device includes a zero cold water circulating connecting valve 100, the structure of which is as follows: Figure 2-5 As shown, it includes a valve body 110 and a temperature sensor 120, a switch and a check valve 140 arranged in the valve body 110. The valve body 110 is a cylindrical shell structure with both ends open, so as to facilitate its installation on the circulation pipeline 600, and a flow channel 111 for connecting the circulation pipeline 600 is arranged therein. The temperature sensor 120 extends into the flow channel 111 to detect the water temperature in the flow channel 111. A partition 112 is fixed on the inner wall of the middle part of the valve body 110, and the partition 112 divides the flow channel 111 into two parts. The temperature sensor 120 and the check valve 140 are respectively located in the two parts, and the temperature sensor 120 is located upstream of the check valve 140. The partition 112 includes a first inclined section, a horizontal section and a second inclined section connected in sequence, the horizontal section extends along the axial direction of the flow channel 111, the first inclined section and the second inclined section are parallel to each other, and a through hole 1120 is opened on the horizontal section to connect the two parts of the flow channel 111.

[0089] The one-way valve 140 is located on the side of the switch away from the temperature sensor 120, and the flow direction of the one-way valve 140 is from the water outlet 402 to the water inlet 401 of the water heater 400. The one-way valve 140 can prevent cold water from entering the hot water when the water end 300 turns on the hot water.

[0090] The switch is located on the side of the temperature sensor 120 close to the water inlet 401 of the water heater 400, and the switch is a solenoid valve 130. The solenoid valve 130 includes a solenoid valve coil 131, a solenoid valve controller 136, a valve core 135, an O-ring 134, a reset spring 133 and a closing cover 132. The solenoid valve coil 131 is installed on the outer surface of the valve body 110, the valve core 135 is installed inside the solenoid valve coil 131 and extends to the inside of the valve body 110, and the solenoid valve controller 136 is used to control the on and off of the solenoid valve 130, thereby controlling the extension and retraction of the valve core 135 to block and expose the through hole 1120; the reset spring 133 is used to reset the valve core 135, the closing cover 132 is used to close the reset spring 133, and the O-ring 134 is used to seal between the valve core 135 and the valve body 110 to prevent water in the valve body 110 from entering the solenoid valve 130.

[0091] A flow meter (not shown) is also provided in the circulation pipeline 600 for detecting the water flow in the circulation pipeline 600. The flow meter is provided between the zero cold water circulation connection valve 100 and the water inlet 401 of the water heater 400. Of course, the flow meter can also be provided above the water inlet 401 of the water heater 400.

[0092] The water heater 400 further includes a control assembly 200 , which is electrically connected to the temperature sensor 120 , and the control assembly 200 is electrically connected to the solenoid valve 130 . The control assembly 200 controls the opening and closing of the solenoid valve 130 according to the temperature value transmitted by the temperature sensor 120 .

[0093] Example 2

[0094] This embodiment provides an energy-saving control system. Figure 6 As shown, the energy-saving control system includes a temperature detection module 120 , a circulation pipeline cutting module 130 and a control module 200 .

[0095] The temperature detection module 120 is used to detect the water temperature value at a preset position point in the circulation pipeline 600. The preset position point is the position of the zero cold water circulation connecting valve 100 in Example 1. The temperature detection module 120 is the temperature sensor 120 in Example 1.

[0096] The circulation pipeline cut-off module 130 is used to open or close the water flow channel of the circulation pipeline 600 at a preset position point. The circulation pipeline cut-off module 130 is the solenoid valve 130 in Example 1.

[0097] The control module 200 is respectively connected to the temperature detection module 120, the circulation pipeline cut-off module 130, the circulation water pump 403 of the water heater 400, and the heat exchanger 404 of the water heater 400. When the water temperature value transmitted by the temperature detection module 120 is greater than or equal to the first preset water temperature T1, the control module 200 controls the circulation pipeline cut-off module 130 to be closed; when the water temperature value transmitted by the temperature detection module 120 is less than the second preset water temperature T2, the control module 200 controls the circulation pipeline cut-off module 130 to be opened. The control module 200 is the control assembly 200 in Example 1.

[0098] The energy-saving control system of this embodiment also includes a flow detection module 202, which is the flow meter in Example 1. The flow detection module 202 is arranged between a preset position point of the circulation pipeline 600 and the water inlet 401 of the water heater 400, and is used to detect the water flow in the circulation pipeline 600. The flow detection module 202 is electrically connected to the control module 200. When the water flow q detected by the flow detection module 202 is less than the preset flow value q0, the control module 200 controls the circulation water pump 403 of the water heater 400 and the heat exchanger 404 of the water heater 400 to stop operating.

[0099] Example 3

[0100] This embodiment is further improved on the basis of embodiment 2. Figure 7 As shown, the energy-saving control system of this embodiment further includes a timing module 201, which is integrated on the control module 200 and is a timer. The condition for the control module 200 to control the circulation pipeline cut-off module 130 to open is that the control module 200 controls the circulation pipeline cut-off module 130 to open according to the timing data transmitted by the timing module so as to open the water flow channel at the preset position point.

[0101] This embodiment provides another implementation method for reopening the circulation pipeline cut-off module 130 , and controls the reopening of the circulation pipeline cut-off module 130 by timing.

[0102] Example 4

[0103] This embodiment provides an energy-saving control method, which is used in the water heater zero cold water system of embodiment 1, see Figure 8 As shown, the energy-saving control method of this embodiment includes the following steps:

[0104] S1. When the water heater 400 has a circulation demand, the control assembly 200 controls the circulation water pump 403 to operate, and controls the heat exchanger 404 of the water heater 400 to operate, and starts circulation preheating.

[0105] S2. The temperature sensor 120 continuously detects the water temperature t. If t≥T1, the control assembly 200 controls the solenoid valve 130 to close.

[0106] S3. The flow meter continuously detects the flow value q in the circulation pipeline. If q<q0, the control assembly 200 controls the circulation water pump 403 to stop running, and controls the heat exchanger 404 of the water heater 400 to stop running.

[0107] S4. If t<T2, the control assembly 200 controls the solenoid valve 130 to open.

[0108] S5. Repeat the above steps.

[0109] Wherein, in step S2, T1 is a first preset temperature value.

[0110] In step S3, q0 is a preset flow value, and q0 is set to 1 L / min.

[0111] In step S4, T2 is a second preset temperature value, and T2<T1.

[0112] In some other embodiments, step S3 can be replaced by: when the electromagnetic valve 130 is detected to have a closing action, the control assembly 200 controls the circulating water pump 403 to stop running, and controls the heat exchanger 404 of the water heater 400 to stop running. Whether the electromagnetic valve 130 has a closing action can be detected by the principle of infrared or laser ranging, and an infrared / laser transmitter and an infrared / laser receiver are respectively arranged on the opposite surfaces of the valve core 135 and the closing cover 132, and the infrared / laser receiver is electrically connected to the control assembly 200, and the extension and retraction of the valve core 135 are judged by the difference in the distance between the valve core 135 and the closing cover 132 when the valve core 135 of the electromagnetic valve 130 is extended and retracted.

[0113] In some other embodiments, step S4 may be replaced by: when the timer reaches the preset preheating interval time, the control assembly 200 controls the solenoid valve 130 to open, and the preheating interval time is set to 10 seconds.

[0114] In this embodiment, a temperature sensor 120 is used to detect the water temperature value at a preset position point in the circulation pipeline 600, and the preset position point is the position of the zero cold water circulation connection valve 100 in Embodiment 1. The temperature sensor 120 is arranged inside the zero cold water circulation connection valve 100. It is conceivable that the temperature sensor 120 may not be arranged inside the zero cold water circulation connection valve 100, or other alternative structures may be adopted, as long as a structure capable of detecting the water temperature value of the circulation pipeline 600 at the preset position point is arranged at the preset position point, and is not limited to the structure and installation position of the temperature sensor 120 in this embodiment.

[0115] In this embodiment, the solenoid valve 130 is used to open or close the water flow channel of the circulation pipeline 600 at the preset position point, and the solenoid valve 130 is arranged on the zero cold water circulation connection valve 100. It is conceivable that the solenoid valve 130 may not be arranged on the zero cold water circulation connection valve 100, or other alternative structures may be adopted, as long as the solenoid valve 130 is arranged at the preset position point to open or close the water flow channel of the circulation pipeline 600 at the preset position point, and is not limited to the structure and installation position of the solenoid valve 130 in this embodiment.

[0116] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. Each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and a part of the above-mentioned module, program segment or code contains one or more executable instructions for implementing a specified logical function. It should also be noted that each box in the block diagram and / or flow chart, and the combination of boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0117] It should be noted that this embodiment is only an example of the energy-saving control method and control system of the present invention using a gas water heater. According to actual needs, the gas water heater in this embodiment can also be replaced by an electric heating water heater or a solar water heater or a water heater device using other heating methods.

Claims

1. An energy-saving control system for a water heater zero cold water system, the water heater zero cold water system comprising a circulation pipeline, characterized in that: The energy-saving control system comprises: A temperature detection module, the temperature detection module is used to detect the water temperature value at a preset position point in the circulation pipeline, the preset position point is located between the connection point of the circulation pipeline with the cold water interface of the water-using end and the connection point of the circulation pipeline with the hot water interface of the water-using end; A circulation pipeline cut-off module, the circulation pipeline cut-off module is used to open or close the water flow channel of the circulation pipeline at a preset position point; A control module, the control module is respectively connected to the temperature detection module, the circulation pipeline cut-off module, the circulation water pump of the water heater and the heat exchanger of the water heater, and the control module is used to control the circulation pipeline cut-off module to close the water flow channel of the circulation pipeline at a preset position point when the water temperature value transmitted by the temperature detection module reaches a first preset water temperature, and control the circulation water pump of the water heater and the heat exchanger of the water heater to stop running; The energy-saving control system further comprises a timing module, which is connected to the control module, and the control module controls the circulation pipeline cut-off module to open according to the timing data transmitted by the timing module so as to open the water flow channel at the preset position point; The energy-saving control system also includes a water flow detection module, which is connected to the control module and is used to detect the water flow in the circulation pipeline. The control module controls the circulating water pump of the water heater and the heat exchanger of the water heater to stop operating according to the water flow data transmitted by the water flow detection module.

2. The energy-saving control system according to claim 1, characterized in that: The energy-saving control system adopts an energy-saving control method, which is used for a water heater zero-cold water system. A circulation pipeline is connected between the water inlet and the water outlet of the water heater, and a circulating water pump is arranged on the water inlet pipeline of the water heater. The energy-saving control method comprises the following steps: S1, controlling the operation of the circulating water pump and the operation of the heat exchanger of the water heater to start circulating preheating; S2. When it is detected that the water temperature at a preset position point in the circulation pipeline is greater than or equal to a first preset temperature T1, the circulation pipeline is controlled to be closed at the preset position point, and the preset position point is located between the connection point between the circulation pipeline and the cold water interface at the water use end and the connection point between the circulation pipeline and the hot water interface at the water use end.

3. The energy-saving control system according to claim 2, characterized in that: The energy-saving control method further comprises the following steps: S3, controlling the circulating water pump to stop running, and controlling the heat exchanger of the water heater to stop running.

4. The energy-saving control system according to claim 3, characterized in that: The energy-saving control method further comprises the following steps: S4. After the preset preheating interval time is reached, the circulation pipeline is controlled to be reconnected at a preset position point.

5. The energy-saving control system according to claim 3, characterized in that: The energy-saving control method further comprises the following steps: S4. When it is detected that the water temperature at a preset position point in the circulation pipeline is lower than a second preset temperature T2, the circulation pipeline is controlled to be reconnected at the preset position point, wherein the first preset temperature T1 is higher than the second preset temperature T2.

6. The energy-saving control system according to claim 3, characterized in that: In step S3, the control condition for stopping the operation of the circulating water pump is q<q0, Among them, q is the flow value in the circulation pipeline, and q0 is the preset flow value.

7. The energy-saving control system according to claim 3, characterized in that: In step S3, the control condition for stopping the operation of the circulating water pump is that when a closing action of the circulating pipeline is detected at a preset position point, the circulating water pump is controlled to stop operating.

8. The energy-saving control system according to claim 1, characterized in that: The water flow detection module is arranged between a preset position point of the circulation pipeline and the water inlet of the water heater.

9. The energy-saving control system according to claim 1, characterized in that: The water heater zero cold water system comprises: Water heater; A circulation pipeline, the two ends of which are respectively connected to the water inlet and the water outlet of the water heater; A circulation pipeline cut-off device, the circulation pipeline cut-off device is arranged on the circulation pipeline, the circulation pipeline at least comprises a first portion and a second portion, the first portion is the portion of the circulation pipeline located between the water outlet of the water heater and the circulation pipeline cut-off device, the second portion is the portion of the circulation pipeline located between the water inlet of the water heater and the circulation pipeline cut-off device, the circulation pipeline cut-off device comprises a temperature sensor and a switch, the circulation pipeline cut-off device can open and close the switch according to the temperature in the circulation pipeline detected by the temperature sensor to connect or cut off the first portion and the second portion; At least one water pipe is provided with a water end, and the two ends of the water pipe are respectively connected to the first part and the second part of the circulation pipe.

10. The energy-saving control system according to claim 9, characterized in that: The switch element is located on a side of the temperature sensor close to the water inlet of the water heater.

11. The energy-saving control system according to claim 9 or 10, characterized in that: The switch element is a solenoid valve.

12. The energy-saving control system according to claim 9 or 10, characterized in that: The circulation pipeline cutting device also includes a one-way valve, which is located on a side of the switch component away from the temperature sensor, and the flow direction of the one-way valve is from the water outlet to the water inlet of the water heater.

13. The energy-saving control system according to claim 12, characterized in that: The circulation pipeline cutting device also includes a valve body, the temperature sensor and the switch element are both arranged in the valve body, a flow channel is arranged in the valve body, the flow channel is connected to the circulation pipeline, the switch element can open or close the flow channel, and the one-way valve is arranged in the flow channel.

14. The energy-saving control system according to claim 13, characterized in that: A partition is also provided in the valve body, and the partition divides the flow channel into two parts. The two parts of the flow channel are connected via a through hole provided on the partition, and the through hole can be blocked and exposed by extending and retracting the actuator of the switch member.

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