Cycle preheating system

Abstract

The present invention provides a circulation preheating system, comprising a water heater, a cold water pipe and a hot water pipe respectively connected to both sides of the water heater, and a circulation preheating device connected to the hot water pipe; the circulation preheating device comprises a heating mechanism, a preheating water inlet pipe and a preheating water outlet pipe respectively connected to both ends of the heating mechanism, and a circulating water pump arranged on the preheating water inlet pipe; the preheating water inlet pipe and the preheating water outlet pipe are respectively connected to two places of the hot water pipe, and the preheating water inlet pipe, the heating mechanism, the preheating water outlet pipe, the hot water pipe, and the preheating water inlet pipe are sequentially connected to form a circulation preheating pipeline. The circulation preheating system provided by the present invention can not only realize hot water output when the machine is turned on, but also can be used in conjunction with an ordinary gas water heater, which is convenient for promotion in the market and improves the popularity and environmental applicability of the product.

Description

Technical Field

[0001] The invention relates to the technical field of water supply, and in particular to a circulation preheating system. Background Art

[0002] It takes a while for ordinary gas water heaters to produce hot water after turning on, which has always been one of the biggest pain points plaguing the gas water heater industry. It not only affects the user's comfort, but also wastes water resources, and has become a problem that the industry urgently needs to solve. In traditional technology, a more common solution is to add a circulating water pump inside the ordinary gas water heater, so that the external pipeline and the gas water heater form a circulating water circuit. Driven by the circulating water pump, the cold water in the circulating water circuit is preheated by the gas water heater, so as to achieve the function of hot water when the machine is turned on. However, since ordinary gas water heaters do not have a driving water pump inside, they cannot realize the functions of circulating water flow and preheating in advance. As a result, to adopt this solution, it is necessary to develop a new gas water heater model with a circulating preheating function separately, which is costly. Moreover, for users who have already purchased ordinary gas water heaters, the function of hot water when the machine is turned on can only be achieved by replacing a new gas water heater with a preheating function, which cannot take into account the old gas water heater users. Therefore, this new gas water heater that can achieve hot water when it is turned on is not easy to promote in the market, and the popularity and environmental applicability of the product are not high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a circulating preheating system, which can not only produce hot water when turned on, but also can be used in conjunction with ordinary gas water heaters, which is easy to promote in the market and improves the popularity and environmental applicability of the product.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0005] A circulation preheating system comprises a water heater, a cold water pipe and a hot water pipe respectively connected to both sides of the water heater, and a circulation preheating device connected to the hot water pipe;

[0006] The circulating preheating device includes a heating mechanism, a preheating water inlet pipe and a preheating water outlet pipe respectively connected to both ends of the heating mechanism, and a circulating water pump arranged on the preheating water inlet pipe; the preheating water inlet pipe and the preheating water outlet pipe are respectively connected to the hot water pipe, and the preheating water inlet pipe, the heating mechanism, the preheating water outlet pipe, the hot water pipe, and the preheating water inlet pipe are sequentially connected to form a circulating preheating pipeline.

[0007] By means of the circulation preheating device provided on the hot water pipe of the water heater, the water in the hot water pipe can be circulated and heated before the water heater is turned on. In this way, before the water heater is turned on to heat the water in the water heater, the water heated by the circulation preheating device in the hot water pipe can be used first, and then the water can be continuously discharged through the hot water pipe for use after the water heater heats the water. Thus, by providing the circulation preheating device on the hot water pipe, the function of hot water output when the water is turned on can be realized without replacing the ordinary gas water heater with a new gas water heater with a preheating function, which is convenient for the transformation and utilization of the ordinary gas water heater, and is convenient for promotion and application, and can reduce costs.

[0008] The following is a further technical solution:

[0009] In one embodiment, the circulating preheating device further comprises a temperature sensor disposed on the preheating water inlet pipe, and a preheating controller connected to the temperature sensor, wherein the preheating controller is connected to both the heating mechanism and the circulating water pump. The temperature sensor can detect the water temperature in the preheating water inlet pipe, so that the preheating controller can control and adjust the heating mechanism and the circulating water pump, thereby heating the water in the preheating water inlet pipe to a suitable temperature.

[0010] In one embodiment, the circulating preheating device further comprises a shell structure, the heating mechanism, the circulating water pump, the temperature sensor, and the preheating controller are all arranged in the shell structure, and the preheating water inlet pipe and the preheating water outlet pipe extend from the inside of the shell structure to the outside. By providing a shell structure that encloses the heating mechanism, the circulating water pump, the temperature sensor, and the preheating controller, the circulating preheating device can be arranged as a modular whole, which is convenient for installing and using the circulating preheating device.

[0011] In one embodiment, the preheating water inlet pipe includes an inner preheating water inlet pipe arranged in the shell structure and an outer preheating water inlet pipe arranged outside the shell structure, the circulating water pump is arranged on the inner preheating water inlet pipe, one end of the inner preheating water inlet pipe is connected to the heating mechanism, and the other end is connected to the outer preheating water inlet pipe, and the outer preheating water inlet pipe is connected to the hot water pipe;

[0012] The preheating water outlet pipe includes a preheating inner water outlet pipe arranged in the shell structure and a preheating outer water outlet pipe arranged outside the shell structure, one end of the preheating inner water outlet pipe is connected to the heating mechanism, and the other end is connected to the preheating outer water outlet pipe, and the preheating outer water outlet pipe is connected to the hot water pipe. By setting the preheating water inlet pipe as the preheating inner water inlet pipe and the preheating outer water inlet pipe respectively located inside and outside the shell structure, and setting the preheating water outlet pipe as the preheating inner water outlet pipe and the preheating outer water outlet pipe respectively located inside and outside the shell structure, it is not only convenient to realize the water flow heating and circulation inside the circulating preheating device, but also convenient to realize the pipeline connection and water flow circulation outside the circulating preheating device.

[0013] In one embodiment, the circulating preheating device further comprises a preheating water inlet joint and a preheating water outlet joint provided on the shell structure, the preheating inner water inlet pipe and the preheating outer water inlet pipe are connected via the preheating water inlet joint, and the preheating inner water outlet pipe and the preheating outer water outlet pipe are connected via the preheating water outlet joint. By providing the preheating water inlet joint and the preheating water outlet joint on the shell structure, it is convenient to connect the internal and external pipes of the circulating preheating device.

[0014] In one embodiment, the preheating controller includes a timing circuit structure connected to the heating mechanism, and a display setting circuit connected to the timing circuit structure. Through the timing circuit structure, the heating mechanism can heat the water flow at a fixed time, without the need to heat the water flow all the time, thereby saving energy. Moreover, by setting the display setting circuit, the heating temperature and time can be set and displayed, so that the user can make appropriate adjustments.

[0015] In one embodiment, the preheating controller further comprises a communication connection module connected to the timing circuit structure, and the communication connection module is configured as a wireless communication structure or a wired communication structure. By configuring the communication connection module, the preheating controller and the circulating preheating device can be remotely controlled by communication, which is convenient and simple.

[0016] In one embodiment, the heating mechanism is configured as an electric heater, an air energy heater, or a solar heater. These heaters are simple in structure, easy to use, and low in cost.

[0017] In one embodiment, the circulating preheating device further includes an intermediate connecting pipe connected between the cold water pipe and the preheating water inlet pipe, and a cold water valve disposed on the intermediate connecting pipe, wherein the cold water valve is connected to the preheating controller. In this way, when the water heater fails, the cold water valve can be controlled to open by the preheating controller, and the heating mechanism can be used to heat the cold water transported from the cold water pipe for temporary use.

[0018] In one embodiment, it further comprises at least one water-using end connected to the cold water pipe and the hot water pipe, and the preheating water inlet pipe is connected to the hot water pipe and is adjacent to the water-using end;

[0019] The water-using end includes a mixing valve connected to the cold water pipe and the hot water pipe, and water-using equipment connected to the mixing valve. By arranging the water-using end close to the connection between the preheating water inlet pipe and the hot water pipe, it is convenient to quickly use the hot water in the preheating water inlet pipe and the hot water pipe, and reduce the heat loss caused by the hot water being transported to the water-using end.

[0020] In one embodiment, the water heater is provided with a hot water outlet joint and a cold water inlet joint, one end of the hot water pipe is connected to the hot water outlet joint, and the other end is connected to the water use end;

[0021] The cold water pipe includes a first water inlet pipe connected to the cold water inlet joint, and a second water inlet pipe connected to the water end, and the first water inlet pipe is in communication with the second water inlet pipe.

[0022] The present invention has the following beneficial effects: the function of producing hot water as soon as the machine is turned on is realized; the circulating preheating device can be used in conjunction with the existing gas water heater, and the technical versatility of realizing the function of producing hot water as soon as the machine is turned on is good; the cold water in the external cold water pipe will not be heated, and the hot water in the hot water pipe and the cold water in the cold water pipe will not affect each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural block diagram of the circulating preheating system of the present invention;

[0024] Figure 2 It is a schematic block diagram of the structure of the preheating device of the circulating preheating system of the present invention.

[0025] Description of reference numerals:

[0026] 100-water heater, 110-cold water inlet joint, 120-hot water outlet joint, 130-air inlet joint, 200-cold water pipe, 300-hot water pipe, 400-circulating preheating device, 401-shell structure, 402-preheating water inlet joint, 403-preheating water outlet joint, 410-preheating outer water inlet pipe, 420-preheating inner water inlet pipe, 430-heating mechanism, 440-preheating inner water outlet pipe, 450-preheating outer water pipe, 460-circulating water pump, 470-temperature sensor, 480-preheating controller, 500-water use end. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same reference numerals in each figure represent the same parts. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0028] like Figure 1 As shown, the present invention proposes a circulation preheating system, including a water heater 100, a cold water pipe 200 and a hot water pipe 300 respectively connected to both sides of the water heater 100, and a circulation preheating device 400 connected to the hot water pipe 300. By means of the circulation preheating device 400 arranged on the hot water pipe 300 of the water heater 100, the water in the hot water pipe 300 can be circulated and heated before the water heater 100 is turned on. In this way, before the water heater 100 is turned on to heat the water in the water heater 100, the water heated by the circulation preheating device 400 in the hot water pipe 300 can be used first, and then the water can be continuously discharged through the hot water pipe 300 for use after the water heater 100 heats the water. Therefore, by arranging the circulation preheating device 400 on the hot water pipe 300, the function of discharging hot water when the water is turned on can be realized without replacing the ordinary gas water heater with a new gas water heater with a preheating function, which is convenient for the transformation and utilization of the ordinary gas water heater, and is convenient for popularization and application, and can reduce costs.

[0029] Specifically, Figure 2As shown, the circulating preheating device 400 includes a heating mechanism 430, a preheating water inlet pipe and a preheating water outlet pipe respectively connected to both ends of the heating mechanism 430, and a circulating water pump 460 arranged on the preheating water inlet pipe. Moreover, the preheating water inlet pipe and the preheating water outlet pipe are respectively connected to the hot water pipe 300, and the preheating water inlet pipe, the circulating water pump 460, the heating mechanism 430, the preheating water outlet pipe, the hot water pipe 300, and the preheating water inlet pipe are sequentially connected to form a circulating preheating pipeline. Before the water heater 100 produces hot water, the heating mechanism 430 of the circulating preheating device 400 can be used to heat the water in the circulating preheating pipeline, and the circulating water pump 460 can make the water in the circulating preheating pipeline circulate (circulate along the preheating water inlet pipe, the preheating water outlet pipe, and the hot water pipe 300), so that the water in the preheating water inlet pipe, the preheating water outlet pipe, and the hot water pipe 300 can be circulated and heated, ensuring that hot water can flow out of the hot water pipe 300 when the water heater 100 is turned on, without waiting for the water heater 100 to heat the water and then flow out of the hot water pipe 300. In addition, in this embodiment, the heating mechanism 430 can be set as an electric heater, an air energy heater, or a solar heater. These heaters have simple structures, are easy to use, and have low costs. In addition, in this embodiment, the circulating water pump 460 can also be set on the preheating water outlet pipe, or the circulating water pump 460 can be set on the preheating water outlet pipe and the preheating water inlet pipe at the same time, so that the water circulation in the circulating preheating pipeline is smoother and faster.

[0030] Moreover, the circulating preheating device 400 further includes a temperature sensor 470 disposed on the preheating water inlet pipe, and a preheating controller 480 connected to the temperature sensor 470, and the preheating controller 480 is connected to both the heating mechanism 430 and the circulating water pump 460. The temperature sensor 470 can detect the water temperature in the preheating water inlet pipe, so that the preheating controller 480 can control and adjust the heating mechanism 430 and the circulating water pump 460, so that the water in the preheating water inlet pipe can be heated to a suitable temperature. Moreover, when the temperature sensor 470 detects that the water temperature is lower than the temperature set by the preheating controller 480, the preheating controller 480 can control the heating mechanism 430 to heat the water in the preheating water inlet pipe, and at the same time, the circulating water pump 460 is used to circulate the water in the circulating preheating pipeline, thereby realizing circulating heating of the water in the circulating preheating pipeline.

[0031] In addition, the preheating controller 480 may include a timing circuit structure connected to the heating mechanism 430, and a display setting circuit connected to the timing circuit structure. Through the timing circuit structure, the heating mechanism 430 can heat the water flow at a fixed time, without heating the water flow all the time, saving energy. Moreover, by setting the display setting circuit, the heating temperature and time can be set and displayed, which is convenient for the user to make appropriate adjustments. In addition, the preheating controller 480 may also include a communication connection module connected to the timing circuit structure, and the communication connection module is set to a wireless communication structure or a wired communication structure. By setting the communication connection module, the preheating controller 480 and the circulation preheating device 400 can be remotely controlled by communication, which is convenient and simple. In this embodiment, the preheating controller 480 and the circulation preheating device 400 can be remotely controlled through the Internet, mobile communication network, or WIFI, and the circulation preheating device 400 can be remotely set. For example, users who use ordinary gas water heaters can turn on the circulation preheating device 400 through their mobile phones before returning home from get off work to preheat the water. After returning home, they can also enjoy the function of hot water as soon as the device is turned on.

[0032] In addition, the circulating preheating device 400 further includes a shell structure 401, in which the heating mechanism 430, the circulating water pump 460, the temperature sensor 470, the preheating controller 480 and other structures can be arranged, and the preheating water inlet pipe and the preheating water outlet pipe extend from the inside of the shell structure 401 to the outside. In this way, by providing the shell structure 401 that encloses the heating mechanism 430, the circulating water pump 460, the temperature sensor 470, the preheating controller 480 and other structures, the circulating preheating device 400 can be set as a modular whole, which is convenient for installing and using the circulating preheating device 400. That is, the circulating preheating device 400 can be assembled and arranged together as a whole, which is convenient for production and processing, and also convenient for ordinary users to install and use.

[0033] In addition, the preheating water inlet pipe includes a preheating inner water inlet pipe 420 disposed in the shell structure 401 and a preheating outer water inlet pipe 410 disposed outside the shell structure 401, the circulating water pump 460 is disposed on the preheating inner water inlet pipe 420, one end of the preheating inner water inlet pipe 420 is connected to the heating mechanism 430, and the other end is connected to the preheating outer water inlet pipe 410, and the preheating outer water inlet pipe 410 is connected to the hot water pipe 300. Moreover, the preheating water outlet pipe includes a preheating inner water outlet pipe 440 disposed in the shell structure 401 and a preheating outer water outlet pipe 450 disposed outside the shell structure 401, one end of the preheating inner water outlet pipe 440 is connected to the heating mechanism 430, and the other end is connected to the preheating outer water outlet pipe 450, and the preheating outer water outlet pipe 450 is connected to the hot water pipe 300. By setting the preheating water inlet pipe as the preheating inner water inlet pipe 420 and the preheating outer water inlet pipe 410 respectively located inside and outside the shell structure 401, and setting the preheating water outlet pipe as the preheating inner water outlet pipe 440 and the preheating outer water outlet pipe 450 respectively located inside and outside the shell structure 401, it is not only convenient to realize the water flow heating and circulation inside the circulating preheating device 400, but also convenient to realize the pipeline connection and water flow circulation outside the circulating preheating device 400. That is, it is convenient to connect the circulating preheating device 400 to the hot water pipe 300 through the preheating outer water inlet pipe 410 and the preheating outer water outlet pipe 450 to form the circulating preheating pipeline.

[0034] Moreover, the circulating preheating device 400 further includes a preheating water inlet joint 402 and a preheating water outlet joint 403 provided on the shell structure 401, the preheating inner water inlet pipe 420 and the preheating outer water inlet pipe 410 are connected through the preheating water inlet joint 402, and the preheating inner water outlet pipe 440 and the preheating outer water outlet pipe 450 are connected through the preheating water outlet joint 403. By providing the preheating water inlet joint 402 and the preheating water outlet joint 403 on the shell structure 401, it is convenient to connect the internal and external pipes of the circulating preheating device 400.

[0035] In addition, the circulation preheating system further includes at least one water-using end 500 connected to the cold water pipe 200 and the hot water pipe 300, and the preheating water inlet pipe is connected to the hot water pipe 300 and adjacent to the water-using end 500. By arranging the water-using end 500 near the connection between the preheating water inlet pipe and the hot water pipe, it is convenient to quickly utilize the hot water in the preheating water inlet pipe and the hot water pipe 300, and reduce the heat loss caused when the hot water is transported to the water-using end 500. Moreover, the water-using end 500 includes a mixing valve connected to the cold water pipe 200 and the hot water pipe 300, and water-using equipment (such as a shower head, a faucet, etc.) connected to the mixing valve. In addition, in this embodiment, one, two, or more water use ends 500 can be set on the cold water pipe 200 and the hot water pipe 300, and correspondingly, one, two, or more circulation preheating devices 400 can be set on the hot water pipe 300, and each of the circulation preheating devices 400 can correspond to one, two, or more water use ends 500.

[0036] In addition, the water heater 100 is provided with a hot water outlet joint 120 and a cold water inlet joint 110, one end of the hot water pipe 300 is connected to the hot water outlet joint 120, and the other end is connected to the water end 500, and the hot water pipe 300 can deliver the hot water generated by the water heater 100 and the circulating preheating device 400 to the water end 500. The cold water pipe 200 includes a first water inlet pipe connected to the cold water inlet joint 110, and a second water inlet pipe connected to the water end 500, the first water inlet pipe is connected to the second water inlet pipe, and the first water inlet pipe and the second water inlet pipe are also connected to the cold water source. The cold water pipe 200 can not only deliver the cold water (i.e., tap water) of the cold water source to the water heater 100 for heating, but also deliver it to the water end 500 for mixing. In addition, the water heater 100 is configured as a gas water heater, and the gas water heater is also provided with an air inlet joint 130, which is convenient for delivering combustion gas to the gas water heater.

[0037] Moreover, the circulating preheating device 400 may further include an intermediate connecting pipe connected to the cold water pipe 200, the intermediate connecting pipe may be connected to the preheating water inlet pipe, and a cold water valve disposed on the intermediate connecting pipe, the cold water valve being connected to the preheating controller 480. When the water heater 100 fails or cannot be used due to other reasons, the cold water valve may be opened by the preheating controller 480 to transport the cold water (i.e., tap water) in the cold water pipe 200 to the circulating preheating device 400 for heating for temporary use. In addition, the circulating preheating device 400 may further include a cold water tank connected to the preheating water inlet pipe and a heat preservation water tank connected to the preheating water outlet pipe, the heating mechanism 430 may heat the cold water stored in the cold water tank and transport it to the heat preservation water tank for heat preservation storage for a large amount of hot water use.

[0038] In addition, the working principle of the circulation preheating system is as follows: before the user uses the water heater 100, the circulation preheating device 400 can detect the temperature of the water in the circulation preheating pipeline through the temperature sensor 470. When the temperature reaches the set circulation preheating start temperature, the preheating controller 480 controls the circulation water pump 460 to start the water in the circulation preheating pipeline to circulate, and at the same time controls the heating mechanism 430 to preheat the circulation water; when the circulation water temperature detected by the temperature sensor 470 reaches the temperature set by the user, the preheating controller 480 controls the circulation water pump 460 to stop working, and at the same time controls the heating mechanism 430 to start working. 0 stops heating, thereby completing the circulating water preheating process; after the circulating water is preheated, open the mixing water valve of the water use end 500 to use hot water, and the hot water preheated in advance in the hot water pipe 300 flows out through the water use end 500, realizing the function of hot water output when the machine is turned on, and at the same time, tap water enters the gas water heater through the cold water inlet joint 110 of the water heater 100 for heating. When the hot water preheated in the hot water pipe 300 is used up, the tap water heated by the gas water heater can be continuously provided to the user through the hot water outlet joint 120 and the hot water pipe 300, truly realizing the function of hot water output when the machine is turned on, reducing the waste of water resources, and improving the comfort of bathing.

[0039] The circulating preheating system provided by the present invention realizes the function of producing hot water as soon as the machine is turned on; the circulating preheating device can be used in conjunction with the existing gas water heater, and has good technical versatility in realizing the function of producing hot water as soon as the machine is turned on; the cold water in the external cold water pipe will not be heated, and the hot water in the hot water pipe and the cold water in the cold water pipe will not affect each other.

[0040] In addition, it should be understood that in this embodiment, the positional relationships indicated by the terms "lower", "upper", "front", "back", "left", "right", "inner", "outer", "top", "bottom", "one side", "the other side", "one end", "the other end", etc. are based on the positional relationships shown in the drawings; the terms "first", "second", etc. are used to distinguish different structural components. These terms are only used to facilitate the description of the present invention and simplify the description, and should not be understood as limiting the present invention.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A circulating preheating system, characterized in that: It comprises a water heater (100), a cold water pipe (200) and a hot water pipe (300) respectively connected to both sides of the water heater, and a circulation preheating device (400) connected to the hot water pipe (300); The circulating preheating device (400) comprises a heating mechanism (430), a preheating water inlet pipe and a preheating water outlet pipe respectively connected to both ends of the heating mechanism (430), and a circulating water pump (460) arranged on the preheating water inlet pipe; the preheating water inlet pipe and the preheating water outlet pipe are respectively connected to the hot water pipe, and the preheating water inlet pipe, the heating mechanism (430), the preheating water outlet pipe, the hot water pipe (300), and the preheating water inlet pipe are sequentially connected to form a circulating preheating pipeline; Wherein, before the water heater (100) is turned on, the water in the hot water pipe (300) is circulated and heated; The circulating preheating device (400) further comprises a temperature sensor (470) arranged on the preheating water inlet pipe, and a preheating controller (480) connected to the temperature sensor (470), wherein the preheating controller (480) is connected to both the heating mechanism (430) and the circulating water pump (460); The circulating preheating device (400) further comprises a shell structure (401), the heating mechanism (430), the circulating water pump (460), the temperature sensor (470), and the preheating controller (480) are all arranged in the shell structure (401), and the preheating water inlet pipe and the preheating water outlet pipe extend from the inside of the shell structure (401) to the outside; The preheating water inlet pipe comprises an inner preheating water inlet pipe (420) arranged in the shell structure (401) and an outer preheating water inlet pipe (410) arranged outside the shell structure (401); the circulating water pump (460) is arranged on the inner preheating water inlet pipe (420); one end of the inner preheating water inlet pipe (420) is connected to the heating mechanism (430) and the other end is connected to the outer preheating water inlet pipe (410); and the outer preheating water inlet pipe (410) is connected to the hot water pipe (300); The circulating preheating device further comprises an intermediate connecting pipe connected between the cold water pipe (200) and the preheating water inlet pipe, and a cold water valve arranged on the intermediate connecting pipe, wherein the cold water valve is connected to the preheating controller (480); The preheating water outlet pipe comprises an inner preheating water outlet pipe (440) arranged in the shell structure (401) and an outer preheating water outlet pipe (450) arranged outside the shell structure (401), one end of the inner preheating water outlet pipe (440) being in communication with the heating mechanism (430) and the other end being in communication with the outer preheating water outlet pipe (450), and the outer preheating water outlet pipe (450) being in communication with the hot water pipe (300); The circulating preheating device (400) also includes a cold water tank connected to the preheating water inlet pipe and a heat preservation water tank connected to the preheating water outlet pipe.

2. The circulating preheating system according to claim 1, characterized in that: The circulating preheating device (400) further comprises a preheating water inlet joint (402) and a preheating water outlet joint (403) arranged on the shell structure (401); the preheating inner water inlet pipe (420) and the preheating outer water inlet pipe (410) are connected via the preheating water inlet joint (402); and the preheating inner water outlet pipe (440) and the preheating outer water outlet pipe (450) are connected via the preheating water outlet joint (403).

3. The circulating preheating system according to claim 1 or 2, characterized in that: The preheating controller (480) comprises a timing circuit structure connected to the heating mechanism (430), and a display setting circuit connected to the timing circuit structure.

4. The circulating preheating system according to claim 3, characterized in that: The preheating controller (480) further comprises a communication connection module connected to the timing circuit structure, wherein the communication connection module is configured as a wireless communication structure or a wired communication structure.

5. The circulating preheating system according to claim 1 or 2, characterized in that: The heating mechanism (430) is configured as an electric heater, an air energy heater, or a solar energy heater.

6. The circulating preheating system according to claim 1 or 2, characterized in that: It also includes at least one water-using end (500) connected to the cold water pipe (200) and the hot water pipe (300), and the preheating water inlet pipe is connected to the hot water pipe (300) and is adjacent to the water-using end (500); The water-using end (500) comprises a water mixing valve connected to the cold water pipe (200) and the hot water pipe (300), and water-using equipment connected to the water mixing valve.

Images