A control system and control method for instant hot water supply

Abstract

This invention discloses an instant hot water supply control system and its control method, comprising a water tank, a main water supply pipe, and a return water pipe. Multiple tiered branch pipes are connected in parallel to the main water supply pipe, each tiered branch pipe is connected to several user branch pipes, and each user branch pipe is connected to several water usage points. Each water usage point is equipped with an electrically controlled valve, a hot water pipe, a tap water pipe, and a water outlet. The system controls the water flow through the electrically controlled valve. When hot water is needed, the electrically controlled valve connects the hot water pipe to the tap water pipe, pushing the cold water in the hot water pipe in reverse direction until all the cold water in the pipes between the tiered inlets and the water usage points is pushed back into the tap water pipe. After the hot water fills the space created by the released cold water, the electrically controlled valve disconnects the hot water pipe from the tap water pipe, and the user can then turn on the tap to get hot water. This is a convenient and comfortable hot water supply system device with a good user experience, and it is also environmentally friendly and energy-saving.

Description

Technical Field

[0001] This invention relates to the technical field of centralized hot water supply for high-rise buildings, and particularly to an instant hot water control system and its control method for centralized hot water supply. Background Technology

[0002] As people's living standards improve, the demand for hot water is also increasing, with many users wanting hot water readily available as soon as they turn on the tap. Traditional centralized hot water supply systems in high-rise buildings typically include an insulated water tank, a booster pump, a main supply pipe, and branch supply pipes. Each branch supply pipe connects to multiple user branch pipes, with the connection point between the main supply pipe and the user branch pipes being the branch pipe inlet. Each user branch pipe connects to multiple water usage points. Under the action of the pump and gravity, the insulated water tank, main supply pipe, and return pipe form a complete hot water loop. However, the pipes between the branch pipe inlets and the water usage points are essentially blind loops, not participating in the hot water circulation. After a period of time, the hot water in these pipes cools down to cold water. When a user needs hot water, after turning on the tap, the hot water can only flow out and be used by the user after the cold water in the branch pipe inlets has been drained and the hot water in the main supply pipe has filled the space created by the drained cold water. For example, if the distance from the branch pipe inlet to the point of use is 18 meters, then users need to run 18 meters of cold water before they can use hot water. This not only causes a great waste of water resources and energy, but also increases the waiting time for users to use water, resulting in a poor user experience.

[0003] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0004] This invention addresses the problems of long waiting times for users in existing centralized hot water supply systems for high-rise buildings, which result in significant waste of water and energy and a poor user experience. It provides an instant hot water control system and its control method for centralized hot water supply.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hot water supply and instant hot water control system includes a water tank, a main water supply pipe, and a return water pipe. The inlet end of the main water supply pipe is connected to the outlet of the water tank, and the outlet end of the return water pipe is connected to the inlet of the water tank. The water tank is located on the top floor of a building. Both the main water supply pipe and the return water pipe are installed in a pipe shaft. Hot water flows out of the water tank, passes through the main water supply pipe and the return water pipe, and then flows back into the water tank. Multiple branch pipes are connected in parallel on the main water supply pipe, and each branch pipe is connected to several users. Each user branch pipe is connected to several water points. Each water point is equipped with an electric control valve, a hot water pipe, a tap water pipe, and a water outlet. The hot water pipe is connected to the user branch pipe, and both the hot water pipe and the tap water pipe are always connected to the water outlet. The electric control valve is used to control the connection or disconnection between the hot water pipe and the tap water pipe. The electric control valve is electrically connected to a linear switch, which is used to control the switching of the working state of the electric control valve. The water pressure in the hot water pipe is greater than the water pressure in the tap water pipe.

[0007] Furthermore, a one-way valve is installed between the hot water pipe and the tap water pipe to allow water in the hot water pipe to flow into the tap water pipe and prevent water in the tap water pipe from flowing into the hot water pipe.

[0008] Furthermore, a thermostat is installed between the hot water pipe and the tap water pipe. The thermostat is used to control whether the electric control valve is activated based on whether the water temperature in the hot water pipe reaches the set temperature.

[0009] Furthermore, the electrically controlled valve is a two-position two-way solenoid valve. When the valve stem of the two-position two-way solenoid valve is in the first position, the hot water pipe is connected to the tap water pipe. When the valve stem of the two-position two-way solenoid valve is in the second position, the hot water pipe is disconnected from the tap water pipe.

[0010] Furthermore, the electrically controlled valve is a temperature control valve, which is used to guide the water flow. When the water temperature is lower than the set temperature, the hot water pipe is connected to the tap water pipe; when the water temperature reaches the set temperature, the hot water pipe is disconnected from the tap water pipe.

[0011] Furthermore, the linear switch is electrically connected to an infrared sensing device.

[0012] Furthermore, the linear switch is equipped with a timing module.

[0013] Furthermore, the timing module controls the linear switch to operate within a set time period t1-t2. At time t1, the linear switch controls the electric control valve to operate, that is, the electric control valve controls the hot water pipe to connect with the tap water pipe, and the water in the hot water pipe flows backward into the tap water pipe for n minutes. Then, the electric control valve controls the hot water pipe to disconnect from the tap water pipe. After an interval of m minutes, the linear switch controls the electric control valve to operate again, and this cycle continues until time t2.

[0014] A control method for an instant hot water supply control system, the method comprising the following steps:

[0015] S1. When the infrared sensor detects a human body signal, the infrared sensor sends the human body signal to the linear switch, and the linear switch sets the time to T1.

[0016] S2. The linear switch sends a command to the electric control valve, which controls the hot water pipe to connect with the tap water pipe. The water in the hot water pipe flows in the opposite direction to the tap water pipe for N minutes, and then the electric control valve controls the hot water pipe to disconnect from the tap water pipe.

[0017] S3. When the infrared sensor detects a human body signal again, the infrared sensor sends the human body signal to the linear switch again, and the linear switch sets this time to T2.

[0018] If T2-T1 > M minutes, proceed to step S2;

[0019] If T2-T1≤M minutes, the linear switch ignores the human body signal.

[0020] With the above structure, the beneficial effects of the present invention are as follows:

[0021] (1) The present invention provides an instant hot water control system, comprising a water tank, a main water supply pipe and a return water pipe. Multiple layered branch pipes are connected in parallel on the main water supply pipe. Each layered branch pipe is connected to several user branch pipes. Each user branch pipe is connected to several water outlets. Each water outlet is equipped with an electric control valve, a hot water pipe, a tap water pipe and a water outlet. The hot water pipe is connected to the user branch pipes. The hot water pipe and the tap water pipe are always connected to the water outlet. The electric control valve is used to control the connection or disconnection between the hot water pipe and the tap water pipe. The linear switch is used to control the switching of the working state of the electric control valve. The water pressure in the hot water pipe is greater than the water pressure in the tap water pipe. This system controls water flow via an electrically controlled valve. When hot water is needed, the valve connects the hot water pipe to the mains water pipe, pushing cold water from the hot water pipe back into the mains water pipe until all the cold water in the pipe between the stratified inlet and the point of use is exhausted. Once the hot water has filled the space created by the released cold water, the valve then disconnects the hot water pipe from the mains water pipe, allowing the user to turn on the tap for hot water. This is a convenient and comfortable hot water supply system that provides instant hot water even over long distances between the stratified inlet and the point of use, improving user experience and being environmentally friendly and energy-saving.

[0022] (2) The instant hot water control system for hot water supply described in this invention includes a thermostat installed between the hot water pipe and the tap water pipe. The thermostat controls whether the electric control valve is activated based on whether the water temperature in the hot water pipe reaches the set temperature. The thermostat ensures that the electric control valve does not activate when the water temperature in the pipe between the stratified inlet and the point of use reaches the set temperature. The electric control valve only activates when the water temperature in the pipe between the stratified inlet and the point of use is lower than the set temperature, thereby causing cold water in the hot water pipe to flow in the reverse direction from the hot water pipe to the tap water pipe. The thermostat avoids frequent operation of the electric control valve, further improving energy efficiency and environmental protection.

[0023] (3) The instant hot water control system for hot water supply described in this invention includes an electrically controlled valve connected to a linear switch, which is electrically connected to an infrared sensor. The linear switch and the infrared sensor work together. When the infrared sensor detects a human signal, it sends the signal to the linear switch, which then controls the electrically controlled valve to open, pushing the cold water in the hot water pipe backwards into the tap water pipe. The time for this backward movement is set according to the length of the pipe, ensuring that all the cold water in the pipe between the stratified inlet and the point of use is pushed backwards into the tap water pipe. Once the cold water has filled the space created by the hot water, the user can immediately get hot water by turning on the tap, without waiting, thus saving energy. Furthermore, the "cooling time" of the linear switch can be set according to the cooling time of the hot water in the pipe between the stratified inlet and the point of use. "Cooling time" refers to the time during which the linear switch receives an infrared sensor signal but ignores it and does not control the electrically controlled valve to open. During the "cooling time," the infrared sensor detects a human body signal and sends it to the linear switch. However, the linear switch ignores this signal because the water in the pipes between the stratified inlet and the point of use is still hot during the "cooling time." The "cooling time" setting avoids frequent operation of the electronically controlled valve, further improving energy efficiency and environmental protection.

[0024] (4) The instant hot water control system of the present invention includes an electrically controlled valve connected to a linear switch, which is equipped with a timing module. Through the cooperation of the linear switch and the timing module, the electrically controlled valve can be set to open and close intermittently during the time period when the user needs to use hot water frequently. Under the premise of energy saving, it ensures that the pipeline between the stratified water inlet and the point of use is always hot water, so that the user can get hot water as soon as he / she turns on the faucet. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is the invention Figure 1 Enlarged view of point A;

[0028] Figure 3 This is the invention Figure 2 Enlarged view of point C;

[0029] Figure 4 This is a flowchart illustrating the control method of the instant hot water control system of the present invention.

[0030] Figures 1 to 4 The winning number is:

[0031] 1. Water tank; 2. Main water supply pipe; 3. Return water pipe; 4. Branch pipes; 5. User branch pipes; 6. Water usage point; 61. Electrically controlled valve; 62. Hot water pipe; 63. Tap water pipe; 64. Water outlet port; 7. Linear switch; 8. Branch water inlet. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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. Therefore, they should not be construed as limiting this invention.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Where applicable, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] like Figures 1 to 4As shown, an instant hot water control system includes a water tank 1, a main water supply pipe 2, and a return water pipe 3. The inlet end of the main water supply pipe 2 is connected to the outlet of the water tank 1, and the outlet end of the return water pipe 3 is connected to the inlet of the water tank 1. The water tank 1 is located on the top floor of the building. Both the main water supply pipe 2 and the return water pipe 3 are installed in a pipe shaft. Hot water flows out of the water tank 1, passes through the main water supply pipe 2 and the return water pipe 3 in sequence, and then flows back into the water tank 1. Multiple branch pipes 4 are connected in parallel on the main water supply pipe 2, and each branch pipe 4 is connected to several user branch pipes 5. Each user branch pipe 5 is connected to several water points 6. Each water point 6 is equipped with an electrically controlled valve 61, a hot water pipe 62, a tap water pipe 63, and a water outlet port 64. The hot water pipe 62 is connected to the user branch pipe 5, and both the hot water pipe 62 and the tap water pipe 63 are always connected to the water outlet port 64. The electrically controlled valve 61 is used to control the connection or disconnection between the hot water pipe 62 and the tap water pipe 63. The electrically controlled valve 61 is electrically connected to a linear switch 7, which is used to control the switching of the working state of the electrically controlled valve 61. The water pressure in the hot water pipe 62 is greater than the water pressure in the tap water pipe 63. A one-way valve is installed between the hot water pipe 62 and the tap water pipe 63 to allow water from the hot water pipe 62 to flow into the tap water pipe 63 while preventing water from the tap water pipe 63 from flowing into the hot water pipe 62.

[0040] Based on the above embodiments, the present invention aims to provide an instant hot water control system, including a water tank 1, a main water supply pipe 2, and a return water pipe 3. Multiple layered branch pipes 4 are connected in parallel on the main water supply pipe 2. Each layered branch pipe 4 is connected to several user branch pipes 5, and each user branch pipe 5 is connected to several water outlets 6. Each water outlet 6 is equipped with an electric control valve 61, a hot water pipe 62, a tap water pipe 63, and a water outlet port 64. The hot water pipe 62 is connected to the user branch pipes 5, and both the hot water pipe 62 and the tap water pipe 63 are always connected to the water outlet port 64. The electric control valve 61 is used to control the connection or disconnection between the hot water pipe 62 and the tap water pipe 63. A linear switch 7 is used to control the switching of the working state of the electric control valve 61. The water pressure in the hot water pipe 62 is greater than the water pressure in the tap water pipe 63. This system controls water flow via an electrically controlled valve 61. When hot water is needed, the valve connects the hot water pipe 62 to the tap water pipe 63, pushing the cold water in the hot water pipe 62 backwards to the tap water pipe 63. This continues until all the cold water in the pipe between the stratified inlet 8 and the water point 6 is pushed back into the tap water pipe 63. After the hot water fills the space created by the released cold water, the valve 61 then disconnects the hot water pipe 62 from the tap water pipe 63, allowing the user to access hot water immediately upon turning on the tap. This is a convenient and comfortable hot water supply system that provides instant hot water even over long distances between the stratified inlet 8 and the water point 6, improving user experience and saving energy. In this embodiment, when the hot water pipe 62 is connected to the tap water pipe 63, the water flow is reversed because the water pressure in the hot water pipe 62 is greater than that in the tap water pipe 63. In addition to having the same water pressure as tap water, the water flow in hot water pipe 62 also experiences pressure due to the height difference, resulting in a greater total water pressure than the water flow in tap water pipe 63. Therefore, when hot water pipe 62 and tap water pipe 63 are connected, water flows backward from hot water pipe 62 into tap water pipe 63. In a further embodiment, the main water supply pipe is equipped with a booster pump. When the water pressure in hot water pipe 62 is not greater than the water pressure in tap water pipe 63, the booster pump can be used to adjust the hot water supply pressure, ensuring that the water pressure in hot water pipe 62 is greater than that in tap water pipe 63. In a further embodiment, a one-way valve is installed between hot water pipe 62 and tap water pipe 63. The one-way valve allows water from hot water pipe 62 to flow into tap water pipe 63, but prevents water from tap water pipe 63 from flowing into hot water pipe 62.In a further embodiment, a temperature control valve is installed on the return water pipe 3. When the water temperature in the return water pipe 3 is lower than the set temperature, the temperature control valve opens, causing the water in the water tank 1, the main water supply pipe 2, and the return water pipe 3 to circulate. The water in the pipes that has not reached the set temperature flows back to the water tank 1 through the main water supply pipe 2 and the return water pipe 3, circulating again. The hot water in the water tank 1 quickly replaces the water in the main water supply pipe 2 and the return water pipe 3 that has reached the set temperature, causing the water temperature to quickly rise to the set temperature. The temperature control valve on the return water pipe 3 avoids the waste of energy caused by the continuous circulation of water in the main water supply pipe 2 and the return water pipe 3, achieving the purpose of energy saving and consumption reduction.

[0041] In another preferred embodiment of the present invention, a thermostat is provided between the hot water pipe 62 and the tap water pipe 63. The thermostat controls whether the electric control valve 61 is activated based on whether the water temperature in the hot water pipe 62 reaches the set temperature. In this embodiment, the thermostat ensures that the electric control valve 61 does not activate when the water temperature in the pipe between the stratified inlet 8 and the water point 6 reaches the set temperature. The electric control valve 61 only activates when the water temperature in the pipe between the stratified inlet 8 and the water point 6 is lower than the set temperature, thereby causing the cold water in the hot water pipe 62 to flow in the reverse direction from the hot water pipe 62 to the tap water pipe 63. The thermostat avoids frequent operation of the electric control valve 61, further improving energy-saving and environmental protection effects.

[0042] Example 1

[0043] The electrically controlled valve 61 is a two-position, two-way solenoid valve. When the valve stem of the two-position, two-way solenoid valve is in the first position, the hot water pipe 62 is connected to the tap water pipe 63. When the valve stem of the two-position, two-way solenoid valve is in the second position, the hot water pipe 62 is disconnected from the tap water pipe 63. In this embodiment, as... Figure 1 , Figure 3As shown, when the valve stem of the two-position two-way solenoid valve is in the first position, the hot water pipe 62 is connected to the tap water pipe 63. The cooled hot water (i.e., cold water) in the hot water pipe 62 is pushed backwards into the tap water pipe 63. The time for the backward push is set according to the distance between the stratified inlet 8 and the water point 6, i.e., the time the valve stem is in the first position. For example, if the backward push takes 2 minutes, all the cold water between the stratified inlet 8 and the water point 6 can be pushed backwards into the tap water pipe 63. Therefore, the time for the valve stem to be in the first position is set to 2 minutes. After 2 minutes, all the cold water in the pipe between the stratified inlet 8 and the water point 6 is pushed backwards into the tap water pipe 63. The hot water fills the space created by the released cold water, and the valve stem moves to the second position. At this time, the hot water pipe 62 and the tap water pipe 63 are disconnected, and the user can turn on the faucet to get hot water. The two-position two-way solenoid valve is connected to a linear switch 7. The linear switch 7 is used to control the valve stem of the two-position two-way solenoid valve to be in the first position or the second position. The linear switch 7 can be triggered manually. In a further embodiment, the linear switch 7 is electrically connected to an infrared sensor. When the infrared sensor detects a human body signal, it sends the signal to the linear switch 7. The linear switch 7 then controls a two-position, two-way solenoid valve to move its valve stem to a first position. After a set time, it controls the valve stem to move to a second position. In a further embodiment, to avoid frequent operation of the two-position, two-way solenoid valve and further save energy, the "cooling time" of the linear switch 7 can be set according to the cooling time required for the hot water in the pipeline between the stratified water inlet 8 and the water point 6. The "cooling time" refers to the time during which the linear switch 7 receives a signal from the infrared sensor but ignores it and does not control the two-position, two-way solenoid valve. For example, if the hot water in the pipeline between the stratified water inlet 8 and the water point 6 cools to cold water after 15 minutes, the "cooling time" is set to 15 minutes. Within 15 minutes, the infrared sensor detects a human body signal and sends it to the linear switch 7, but the linear switch 7 ignores the signal and does not control the two-position, two-way solenoid valve. Fifteen minutes later, the infrared sensor detects the human body signal again and sends it to the linear switch 7. The linear switch 7 then controls the two-position two-way solenoid valve to operate. The "cooling time" setting avoids frequent operation of the two-position two-way solenoid valve, further improving energy efficiency and environmental protection. In another preferred embodiment, the linear switch 7 is equipped with a timing module. The timing module controls the linear switch 7 to operate within a set time period t1-t2. At time t1, the linear switch 7 controls the solenoid valve 61 to operate, that is, the solenoid valve 61 connects the hot water pipe 62 to the tap water pipe 63. The water in the hot water pipe 62 flows backward into the tap water pipe 63 for n minutes. Then, the solenoid valve 61 controls the hot water pipe 62 to disconnect from the tap water pipe 63. After an interval of m minutes, the linear switch 7 controls the solenoid valve 61 to operate again, and this cycle continues until time t2.A timer function can be set according to user habits. For example, if 7:00-8:00 AM is a period of frequent hot water use, the timer module can control the linear switch 7 to move the valve stem of the two-position two-way solenoid valve to the first position every m minutes during this period. This causes the water in the hot water pipe 62 to flow in the opposite direction to the tap water pipe 63 for n minutes. After n minutes, the linear switch 7 controls the valve stem of the two-position two-way solenoid valve to move to the second position, at which point the hot water pipe 62 and the tap water pipe 63 are disconnected. This ensures that hot water is available immediately when the user turns on the tap, achieving instant hot water supply and saving energy. The m minutes are determined based on the cooling time required for the hot water in the pipeline between the stratified inlet 8 and the water point 6. For example, if the hot water in the pipeline between the stratified inlet 8 and the water point 6 cools to cold water after 15 minutes, then m minutes is set to 15 minutes. The time (n minutes) is determined based on the time required for the cold water between the stratified water inlet 8 and the water point 6 to flow backwards into the tap water pipe 63. For example, if it takes 2 minutes for the cooled hot water in the pipeline between the stratified water inlet 8 and the water point 6 to flow backwards into the tap water pipe 63, then n minutes is set to 2 minutes. In a further preferred embodiment, the infrared sensor can be used in conjunction with a timing module. The timing function allows for a shorter "cooling time" setting on the linear switch 7 during periods when hot water is needed frequently, such as during morning and evening washing periods; and a longer "cooling time" setting on the linear switch 7 during periods when hot water is not needed frequently, such as at night.

[0044] Example 2

[0045] This embodiment provides an instant hot water control system, whose main structure and related principles are the same as those in Embodiment 1, with the following differences:

[0046] The electrically controlled valve 61 is a temperature control valve, used to guide the water flow. When the water temperature is lower than the set temperature, the hot water pipe 62 is connected to the tap water pipe 63; when the water temperature reaches the set temperature, the hot water pipe 62 is disconnected from the tap water pipe 63. In this embodiment, the temperature control valve controls the water flow direction according to the water temperature. When the water temperature is lower than the set temperature, the temperature control valve connects the hot water pipe 62 to the tap water pipe 63, pushing the water flow that has not reached the set temperature from the hot water pipe 62 to the tap water pipe 63 in reverse until all the cold water in the pipeline between the stratified inlet 8 and the water point 6 is pushed in reverse into the tap water pipe 63. After the hot water fills the space created by the released cold water, the water flow reaches the set temperature, and the temperature control valve disconnects the hot water pipe 62 from the tap water pipe 63, allowing the user to turn on the tap for hot water.

[0047] Please refer to Figure 4This is a flowchart illustrating the control method of the instant hot water supply control system of the present invention. It should be noted that the basic principle and technical effects of the instant hot water supply control method provided in this embodiment are the same as those of the instant hot water supply control system provided in the foregoing embodiments. For the sake of brevity, parts not mentioned in this embodiment can be referred to the corresponding content of the foregoing embodiments. The following will discuss... Figure 4 The specific process shown will be explained in detail.

[0048] A control method for an instant hot water supply control system, the method comprising the following steps:

[0049] S1. When the infrared sensor detects a human body signal, the infrared sensor sends the human body signal to the linear switch 7, and the linear switch 7 sets the time to T1.

[0050] S2. The linear switch 7 sends a command to the solenoid valve 61, which controls the hot water pipe 62 to connect with the tap water pipe 63. The water in the hot water pipe 62 flows in the opposite direction to the tap water pipe 63 for N minutes. Then the solenoid valve 61 controls the hot water pipe 62 to disconnect from the tap water pipe 63.

[0051] S3. When the infrared sensor detects a human signal again, the infrared sensor sends the human signal to the linear switch 7 again. At this time, the linear switch 7 sets the time to T2.

[0052] If T2-T1 > M minutes, proceed to step S2;

[0053] If T2-T1≤M minutes, the linear switch 7 ignores the human body signal.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A control system for instant hot water supply, comprising a water tank (1), a main water supply pipe (2), and a return water pipe (3), characterized in that: The inlet end of the main water supply pipe (2) is connected to the outlet of the water tank (1), and the outlet end of the return water pipe (3) is connected to the inlet of the water tank (1). The water tank (1) is located on the top floor of the building. The main water supply pipe (2) and the return water pipe (3) are both installed in a pipe shaft. After hot water flows out of the water tank (1), it passes through the main water supply pipe (2) and the return water pipe (3) in sequence and then flows back into the water tank (1). Multiple layered branch pipes (4) are connected in parallel on the main water supply pipe (2). Each layered branch pipe (4) is connected to several water supply pipes. Each user branch pipe (5) is connected to several water points (6). Each water point (6) is equipped with an electric control valve (61), a hot water pipe (62), a tap water pipe (63), and a water outlet (64). The hot water pipe (62) is connected to the user branch pipe (5), and both the hot water pipe (62) and the tap water pipe (63) are always connected to the water outlet (64). The electric control valve (61) is used to control the connection or disconnection between the hot water pipe (62) and the tap water pipe (63). A linear switch (7) is electrically connected to control the switching of the working state of the electric control valve (61). The water pressure in the hot water pipe (62) is greater than the water pressure in the tap water pipe (63). A thermostat is installed between the hot water pipe (62) and the tap water pipe (63). The thermostat is used to control whether the electric control valve (61) is started based on whether the water temperature in the hot water pipe (62) reaches the set temperature. The linear switch (7) is equipped with a timer module. The timer module controls the linear switch (7) to start at the set temperature. The system operates within a fixed time period t1-t2. At time t1, the linear switch (7) controls the electric control valve (61) to operate, that is, the electric control valve (61) controls the hot water pipe (62) to connect with the tap water pipe (63). The water in the hot water pipe (62) flows backward into the tap water pipe (63) for n minutes. Then, the electric control valve (61) controls the hot water pipe (62) to disconnect from the tap water pipe (63). After an interval of m minutes, the linear switch (7) controls the electric control valve (61) to operate again, and this cycle continues until time t2.

2. The instant hot water control system according to claim 1, characterized in that: A one-way valve is provided between the hot water pipe (62) and the tap water pipe (63) so that water in the hot water pipe (62) can flow into the tap water pipe (63) and water in the tap water pipe (63) cannot flow into the hot water pipe (62).

3. The instant hot water control system according to claim 1, characterized in that: The electric control valve (61) is a two-position two-way solenoid valve. When the valve stem of the two-position two-way solenoid valve is in the first position, the hot water pipe (62) is connected to the tap water pipe (63). When the valve stem of the two-position two-way solenoid valve is in the second position, the hot water pipe (62) is disconnected from the tap water pipe (63).

4. The instant hot water control system according to claim 1, characterized in that: The electric control valve (61) is a temperature control valve. The temperature control valve is used to guide the water flow. When the water temperature is lower than the set temperature, the hot water pipe (62) is connected to the tap water pipe (63). When the water temperature reaches the set temperature, the hot water pipe (62) is disconnected from the tap water pipe (63).

5. The instant hot water control system according to claim 1, characterized in that: The linear switch (7) is electrically connected to an infrared sensing device.

6. The control method for an instant hot water supply control system according to claim 5, the method comprising the following steps: S1. When the infrared sensor detects a human body signal, the infrared sensor sends the human body signal to the linear switch (7), and the linear switch (7) is set to time T1 at this time; S2. The linear switch (7) sends a command to the electric control valve (61), which controls the hot water pipe (62) to connect with the tap water pipe (63). The water in the hot water pipe (62) flows in the opposite direction to the tap water pipe (63) for N minutes. Then the electric control valve (61) controls the hot water pipe (62) to disconnect from the tap water pipe (63). S3. When the infrared sensor detects a human signal again, the infrared sensor sends the human signal to the linear switch (7) again. At this time, the linear switch (7) is set to time T2. If T2-T1 > M minutes, proceed to step S2; If T2-T1≤M minutes, the linear switch (7) ignores the human body signal.

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