Water heater, preheating control method, device, and computer-readable storage medium thereof

Abstract

The present invention discloses a water heater and its preheating control method, device, and computer-readable storage medium. The preheating control method includes: controlling the water heater to heat in response to a preheating instruction; controlling the bidirectional circulation pump to operate in a forward direction and the switch valve to open, so that water flows from the water inlet pipe to the water outlet pipe; after a first preset time, controlling the water heater to stop heating and the bidirectional circulation pump to operate in a reverse direction, so that water flows from the water outlet pipe to the water inlet pipe; after a second preset time, controlling the bidirectional circulation pump to stop operating and the switch valve to close. The present invention solves the problem of cold water appearing in the middle of a hot water supply while a user is using the water, and can also reduce energy waste caused by preheating the entire pipe.

Description

Technical Field

[0001] The present invention relates to the field of water heaters, and in particular to a water heater and a preheating control method, device, and computer-readable storage medium thereof. Background Art

[0002] With the development of science and technology, people's requirements for quality of life are getting higher and higher. When people use water heaters, when the water heater is just turned on, the cold water cannot be heated up in time when passing through the water heater, resulting in a short period of cold water in the middle of hot water, which greatly affects the user's water experience.

[0003] In the existing technology, some water heaters with added preheating function generally need to preheat all pipe water. On the one hand, the pipe can only provide hot water when the user needs cold water. On the other hand, preheating all pipe water will cause energy waste. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of untimely heating and energy waste in the prior art, and to provide a water heater and its preheating control method, device, and computer-readable storage medium.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A preheating control method is applied to a water heater, the water heater comprising a heat exchanger, a water inlet pipe, a water outlet pipe, a two-way circulation pump, and an on-off valve, wherein the water outlet end of the heat exchanger is connected to one end of the water outlet pipe, the water inlet end of the heat exchanger is connected to one end of the water inlet pipe, and the other end of the water outlet pipe is connected to the other end of the water inlet pipe via the two-way circulation pump and the on-off valve to form a circulation pipeline;

[0007] The preheating control method comprises:

[0008] In response to the preheating instruction, controlling the water heater to perform heating;

[0009] Controlling the bidirectional circulation pump to run in the forward direction and the switch valve to open, so that water flows from the water inlet pipe into the water outlet pipe;

[0010] After a first preset time period, the water heater is controlled to stop heating and the bidirectional circulation pump is controlled to run in reverse, so that water flows from the water outlet pipe into the water inlet pipe;

[0011] After a second preset time period, the bidirectional circulation pump is controlled to stop running and the switch valve is closed.

[0012] Preferably, the preheating control method further includes:

[0013] In response to the preheating instruction issued for the first time, controlling the water heater to perform heating;

[0014] Controlling the bidirectional circulation pump to run in the forward direction and the switch valve to open, so as to preheat the water flow in the circulation pipe;

[0015] If the temperature of the water flow in the circulation pipe reaches a preset temperature, the water heater is controlled to stop heating, and the two-way circulation pump is controlled to stop running and the switch valve is closed.

[0016] Preferably, the preheating control method further includes:

[0017] In response to the first preheating instruction, the timing is started;

[0018] In response to the water heater stopping heating, stopping the timing and recording the duration as the full pipe heating duration;

[0019] The first preset time duration and / or the second preset time duration are determined according to the full-tube heating time duration.

[0020] Preferably, the first preset time is determined according to the full pipe heating time and the proportion of the water outlet pipe to the circulation pipe.

[0021] A preheating control device is applied to a water heater, the water heater comprising a heat exchanger, a water inlet pipe, a water outlet pipe, a two-way circulation pump, and an on-off valve, wherein the water outlet end of the heat exchanger is connected to one end of the water outlet pipe, the water inlet end of the heat exchanger is connected to one end of the water inlet pipe, and the other end of the water outlet pipe is connected to the other end of the water inlet pipe via the two-way circulation pump and the on-off valve to form a circulation pipeline;

[0022] The preheating control device comprises:

[0023] a preheating module, configured to control the water heater to perform heating in response to a preheating instruction;

[0024] A forward operation module, used to control the forward operation of the bidirectional circulation pump and the opening of the switch valve, so that water flows from the water inlet pipe into the water outlet pipe;

[0025] a reverse operation module, configured to control the water heater to stop heating and the bidirectional circulation pump to reversely operate after a first preset time period, so that water flows from the water outlet pipe into the water inlet pipe;

[0026] The stopping module is used to control the bidirectional circulation pump to stop running and the switch valve to close after a second preset time period.

[0027] Preferably, the preheating module is further configured to control the water heater to perform heating in response to a preheating instruction issued for the first time;

[0028] The forward operation module is further used to control the forward operation of the bidirectional circulation pump and the opening of the switch valve to preheat the water flow in the circulation pipeline;

[0029] The stopping module is further configured to control the water heater to stop heating if the temperature of the water flow in the circulation pipe reaches a preset temperature, and to control the bidirectional circulation pump to stop running and the switch valve to close.

[0030] Preferably, the preheating control device further includes:

[0031] A timing start module, configured to start timing in response to a preheating instruction issued for the first time;

[0032] A stop timing module, configured to stop timing in response to the water heater stopping heating, and record the duration as the heating duration of the entire pipe;

[0033] The first preset time duration and / or the second preset time duration are determined according to the full-tube heating time duration.

[0034] Preferably, the first preset time is determined according to the full pipe heating time and the proportion of the water outlet pipe to the circulation pipe.

[0035] A water heater comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the above-mentioned preheating control methods when executing the computer program.

[0036] A computer-readable storage medium stores a computer program, wherein the computer program implements any of the above-mentioned preheating control methods when executed by a processor.

[0037] The positive and progressive effects of the present invention are as follows: upon receiving a preheating instruction, the water heater is controlled to begin heating, and then the two-way circulation pump is controlled to first operate in the forward direction to ensure that sufficient hot water flows into the water outlet pipe. Then, the two-way circulation is controlled to operate in the reverse direction to ensure that a sufficient amount of hot water is also reserved at the water inlet of the water heater. In addition, after preheating is completed, the on-off valve is controlled to close to prevent the cold water in the water inlet pipe from interfering with the hot water in the water outlet pipe, causing the water temperature to fail to reach the user's expected temperature, further improving the user experience. The present invention solves the problem of cold water appearing in the middle of the hot water pipe when the user is using it, while also reducing the energy waste caused by preheating the entire pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a water heater provided by an exemplary embodiment of the present invention;

[0039] Figure 2A flowchart of a preheating control method provided in an exemplary embodiment 1 of the present invention;

[0040] Figure 3 A module diagram of a preheating control device provided in an exemplary embodiment 2 of the present invention;

[0041] Figure 4 This is a schematic structural diagram of a water heater provided by an exemplary embodiment 3 of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0043] Figure 1 A water heater is provided as an exemplary embodiment of the present invention; the water heater includes a heat exchanger 13, a water inlet pipe 11, a water outlet pipe 12, a two-way circulation pump 14 and a switch valve 15, the water outlet end of the heat exchanger is connected to one end of the water outlet pipe, the water inlet end of the heat exchanger 13 is connected to one end of the water inlet pipe, and the other end of the water outlet pipe 12 is connected to the other end of the water inlet pipe 11 through the two-way circulation pump 14 and the switch valve 15 to form a circulation pipeline.

[0044] Among them, a water point is provided on the water outlet pipe 12, which is used to provide the water flow preheated in the heat exchanger 13 to the user; the water inlet pipe 11 is mainly used to connect the external pipeline to transport cold water to the exchanger 13 for heating. In addition, a water point is also provided in the water inlet pipe 11 to provide the required cold water to the user.

[0045] A faucet 16 is further provided in the circulation pipeline, and the faucet 16 can be connected to the water outlet pipe 12 and the water inlet pipe 11. Cold water or hot water can be selected according to the water demand of the user.

[0046] The bidirectional circulation pump 14 is used to control the flow direction of water in the circulation pipeline. When the bidirectional circulation pump 14 runs in the forward direction, water flows from the heat exchanger 13 into the outlet pipe 12 and from the inlet pipe 11 into the heat exchanger 13. When the bidirectional circulation pump 14 runs in the reverse direction, water flows from the heat exchanger 13 into the inlet pipe 11 and from the outlet pipe 12 into the heat exchanger 13.

[0047] The switch valve 15 can be opened or closed. When the switch valve 15 is opened, the water flow can flow from the water inlet pipe to the water outlet pipe or from the water outlet pipe to the water inlet pipe according to the water demand, and the flow direction of the water flow is not restricted in the pipeline; when the switch valve 15 is closed, the water flow no longer flows from the water inlet pipe 11 to the water outlet pipe 12 and / or from the water outlet pipe 12 to the water inlet pipe 11, so as to avoid mutual interference between hot water and cold water, which affects the user's water demand.

[0048] Example 1

[0049] Figure 2A preheating control method provided in this embodiment is applied to a water heater to control the water heater to perform half-pipe preheating. The preheating control method includes:

[0050] S106 . In response to the preheating instruction, control the water heater to perform heating.

[0051] S107: Control the bidirectional circulation pump to run in the forward direction and the switch valve to open, so that water flows from the water inlet pipe to the water outlet pipe.

[0052] In this embodiment, in response to the preheating instruction, the water heater is controlled to heat, and the two-way circulation pump 14 is simultaneously controlled to start in the forward direction and the on-off valve 15 is opened, allowing the water to flow in the forward direction, so that the preheated water can flow into the water outlet pipe 12, thereby preheating the water in the water outlet pipe 12. When the user has a water demand, the water outlet pipe 12 can store a sufficient amount of hot water.

[0053] S108. After a first preset time period, the water heater is controlled to stop heating and the two-way circulation pump is controlled to run in reverse, so that water flows from the water outlet pipe into the water inlet pipe.

[0054] In this embodiment, after the water heater has heated for a first predetermined period of time, sufficient hot water is stored in the water outlet pipe 12 for user use. The water heater is shut off to reduce overheating of the water. Simultaneously, the bidirectional circulation pump 14 is reversed to allow the preheated water to flow from the water outlet pipe 12 through the heat exchanger 13 into the water inlet pipe 11.

[0055] S109: After a second preset time period, the bidirectional circulation pump is controlled to stop running and the switch valve is closed.

[0056] In this embodiment, after the reverse circulation pump 14 is activated for a second predetermined time, a sufficient amount of preheated water has flowed into the water inlet of the heat exchanger 13 connected to the water inlet pipe 11. The reverse circulation pump 14 is controlled to shut down to prevent excessive preheated water from flowing into the water inlet pipe 11, thereby preventing the preheated water from being lost in the water outlet pipe 12. Furthermore, closing the on-off valve prevents heat exchange between the preheated and unpreheated water in the circulation pipe, which could result in the hot water in the water outlet pipe 12 failing to reach the predetermined temperature and thus affecting the user experience.

[0057] In order to avoid the phenomenon that the water flowing into the water inlet pipe 11 cannot be heated to the preset temperature due to the water heater not heating up in time when the user just turns on the hot water, thereby causing the water to be temporarily cold in the middle section of the hot water, the two-way circulation pump 14 is controlled to reserve sufficient hot water at the water inlet end connected to the water inlet pipe 11 and the water heater.

[0058] In one embodiment, a water inlet temperature sensor 17 is further provided at the water inlet end of the heat exchanger 13 for collecting the water inlet temperature. When the water heater is initially started for preheating, the water heater is controlled to preheat the entire pipe to collect the parameters required for half-pipe preheating. Specifically, the preheating control method further includes:

[0059] S101 : In response to a preheating instruction issued for the first time, control the water heater to perform heating.

[0060] S102: Control the bidirectional circulation pump to run in the forward direction and the switch valve to open, so as to preheat the water flow in the circulation pipe.

[0061] In this embodiment, the two-way circulation pump 14 is controlled to run in the forward direction and the switch valve 15 is opened, and the water flows continuously in the forward direction in the pipeline, that is, the preheated water flows into the heat exchanger 13 from the water inlet pipe 11 and flows out from the water outlet pipe 12. Under the forward operation of the two-way circulation pump 14, the preheated water flows into the water inlet pipe 11 through the water outlet pipe 12, so that all the water in the circulation pipeline is preheated.

[0062] S103: If the temperature of the water flow in the circulation pipe reaches the preset temperature, the water heater is controlled to stop heating, and the two-way circulation pump is controlled to stop running and the switch valve is closed.

[0063] In this embodiment, the temperature of the water flow in the circulation pipe is collected by the water inlet temperature sensor 17. Specifically: in response to the preheating instruction issued for the first time, the water inlet temperature sensor 17 is controlled to collect the initial water inlet temperature t1 at the water inlet end; during the heating process of the water heater, the water inlet temperature sensor 17 is continuously controlled to collect the water inlet temperature t2.

[0064] When t2-t1>H1, it is considered that the temperature of the water flow in the circulation pipe has reached the preset temperature. Among them, H1 is the preset temperature threshold, which is set according to the user's water demand.

[0065] In one embodiment, the preheating control method further includes:

[0066] S104: In response to the first issued preheating instruction, start timing.

[0067] S105 , in response to the water heater stopping heating, stop timing, and record the duration as the heating duration of the entire pipe.

[0068] In a specific implementation, the first preset time and / or the second preset time can be determined according to the full tube heating time, as follows:

[0069] The first preset time length T2 = (λ+a)T1, and the second preset time length T3 = aT1.

[0070] Among them, λ is the proportion of the outlet pipe to the circulation pipe, a is obtained based on the whole machine test, and T1 is the heating time of the entire pipe.

[0071] In this embodiment, upon receiving a preheating command, the water heater is controlled to begin heating. The bidirectional circulation pump is then controlled to first operate in the forward direction to ensure sufficient hot water flows into the outlet pipe. The bidirectional circulation pump is then controlled to operate in the reverse direction to ensure sufficient hot water is also reserved at the water inlet of the water heater. Furthermore, after preheating is complete, the on-off valve is controlled to close to prevent heat exchange between hot and cold water, which could result in the water temperature not reaching the user's desired temperature. This further enhances the user experience. This invention solves the problem of cold water appearing in the middle of a hot water pipe while the user is using it, while also reducing energy waste associated with full pipe preheating.

[0072] Example 2

[0073] Figure 3 A preheating control device provided in this embodiment is applied to a water heater to control the water heater to perform half-pipe preheating. The preheating control device includes:

[0074] The preheating module 21 is used to control the water heater to perform heating in response to a preheating instruction.

[0075] The forward operation module 22 controls the bidirectional circulation pump to run forward and the switch valve to open, so that water flows from the water inlet pipe to the water outlet pipe.

[0076] In this embodiment, in response to the preheating instruction, the water heater is controlled to heat, and the two-way circulation pump 14 is simultaneously controlled to start in the forward direction and the on-off valve 15 is opened, allowing the water to flow in the forward direction, so that the preheated water can flow into the water outlet pipe 12, thereby preheating the water in the water outlet pipe 12. When the user has a water demand, the water outlet pipe 12 can store a sufficient amount of hot water.

[0077] The reverse operation module 23 is used to control the water heater to stop heating and the two-way circulation pump to reversely operate after a first preset time period, so that water flows from the water outlet pipe to the water inlet pipe.

[0078] In this embodiment, after the water heater has heated for a first predetermined period of time, sufficient hot water is stored in the water outlet pipe 12 for user use. The water heater is shut off to reduce overheating of the water. Simultaneously, the bidirectional circulation pump 14 is reversed to allow the preheated water to flow from the water outlet pipe 12 through the heat exchanger 13 into the water inlet pipe 11.

[0079] The stopping module 24 is used to control the bidirectional circulation pump to stop running and the switch valve to close after a second preset time period.

[0080] In this embodiment, after the reverse circulation pump 14 is activated for a second predetermined time, a sufficient amount of preheated water has flowed into the water inlet of the heat exchanger 13 connected to the water inlet pipe 11. The reverse circulation pump 14 is controlled to shut down to prevent excessive preheated water from flowing into the water inlet pipe 11, thereby preventing the preheated water from being lost in the water outlet pipe 12. Furthermore, closing the on-off valve prevents heat exchange between the preheated and unpreheated water in the circulation pipe, which could result in the hot water in the water outlet pipe 12 failing to reach the predetermined temperature and thus affecting the user experience.

[0081] In order to avoid the phenomenon that the water flowing into the water inlet pipe 11 cannot be heated to the preset temperature due to the water heater not heating up in time when the user just turns on the hot water, thereby causing the water to be temporarily cold in the middle section of the hot water, the two-way circulation pump 14 is controlled to reserve sufficient hot water at the water inlet end connected to the water inlet pipe 11 and the water heater.

[0082] In one embodiment, a water inlet temperature sensor 17 is further provided at the water inlet end of the heat exchanger 13 for collecting the water inlet temperature. When the water heater is initially started for preheating, the water heater is controlled to perform full pipe preheating to collect the parameters required for half pipe preheating. Specifically, the preheating control device further includes:

[0083] The preheating module 21 is further configured to control the water heater to perform heating in response to a preheating instruction issued for the first time.

[0084] The forward operation module 22 is further used to control the forward operation of the bidirectional circulation pump and the opening of the switch valve to preheat the water flow in the circulation pipeline.

[0085] In this embodiment, the two-way circulation pump 14 is controlled to run in the forward direction and the switch valve 15 is opened, and the water flows continuously in the forward direction in the pipeline, that is, the preheated water flows into the heat exchanger 13 from the water inlet pipe 11 and flows out from the water outlet pipe 12. Under the forward operation of the two-way circulation pump 14, the preheated water flows into the water inlet pipe 11 through the water outlet pipe 12, so that all the water in the circulation pipeline is preheated.

[0086] The stopping module 24 is further configured to control the water heater to stop heating if the temperature of the water flow in the circulation pipe reaches a preset temperature, and to control the bidirectional circulation pump to stop running and the switch valve to close.

[0087] In this embodiment, the temperature of the water flow in the circulation pipe is collected by the water inlet temperature sensor 17. Specifically: in response to the preheating instruction issued for the first time, the water inlet temperature sensor 17 is controlled to collect the initial water inlet temperature t1 at the water inlet end; during the heating process of the water heater, the water inlet temperature sensor 17 is continuously controlled to collect the water inlet temperature t2.

[0088] When t2-t1>H1, it is considered that the temperature of the water flow in the circulation pipe has reached the preset temperature. Among them, H1 is the preset temperature threshold, which is set according to the user's water demand.

[0089] In one embodiment, the preheating control device further includes:

[0090] The timing start module 25 is configured to start timing in response to the first preheating instruction issued.

[0091] The stop timing module 26 is used to stop timing in response to the water heater stopping heating, and record the duration as the heating duration of the entire pipe.

[0092] In a specific implementation, the first preset time and / or the second preset time can be determined according to the full tube heating time, as follows:

[0093] The first preset time length T2 = (λ+a)T1, and the second preset time length T3 = aT1.

[0094] Among them, λ is the proportion of the outlet pipe to the circulation pipe, a is obtained based on the whole machine test, and T1 is the heating time of the entire pipe.

[0095] In this embodiment, upon receiving a preheating command, the water heater is controlled to begin heating. The bidirectional circulation pump is then controlled to first operate in the forward direction to ensure sufficient hot water flows into the outlet pipe. The bidirectional circulation pump is then controlled to operate in the reverse direction to ensure sufficient hot water is also reserved at the water inlet of the water heater. Furthermore, after preheating is complete, the on-off valve is controlled to close to prevent heat exchange between hot and cold water, which could result in the water temperature not reaching the user's desired temperature. This further enhances the user experience. This invention solves the problem of cold water appearing in the middle of a hot water pipe while the user is using it, while also reducing energy waste associated with full pipe preheating.

[0096] Example 3

[0097] Figure 4 This is a schematic structural diagram of a water heater shown in this embodiment, showing a block diagram of an exemplary water heater 30 suitable for implementing the embodiment of the present invention. Figure 4 The water heater 30 shown is merely an example and should not limit the functionality and scope of use of the embodiments of the present invention.

[0098] like Figure 4 As shown, the water heater 30 may be implemented as a general-purpose computing device, such as a server device. Components of the water heater 30 may include, but are not limited to, the at least one processor 31, the at least one memory 32, and a bus 33 connecting various system components (including the memory 32 and the processor 31).

[0099] The bus 33 includes a data bus, an address bus, and a control bus.

[0100] The memory 32 may include a volatile memory, such as a random access memory (RAM) 321 and / or a cache memory 322 , and may further include a read-only memory (ROM) 323 .

[0101] The memory 32 may also include a program tool 325 (or utility) having a set (at least one) of program modules 324, such program modules 324 including but not limited to: an operating system, one or more application programs, other program modules and program data, each of which or some combination may include an implementation of a network environment.

[0102] The processor 31 executes various functional applications and data processing by running computer programs stored in the memory 32, such as the method provided in Example 1.

[0103] The water heater 30 can also communicate with one or more external devices 34. Such communication can occur via an input / output (I / O) interface 35. Furthermore, the model-generated water heater 30 can also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 36. As shown, the network adapter 36 communicates with other modules of the model-generated water heater 30 via a bus 33. It should be understood that, although not shown, other hardware and / or software modules can be used in conjunction with the model-generated water heater 30, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, RAID (RAID) systems, tape drives, and data backup storage systems.

[0104] It should be noted that although the detailed description above refers to several units / modules or sub-units / modules of the water heater, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units / modules described above may be embodied in a single unit / module. Conversely, the features and functions of a single unit / module described above may be further divided and embodied by multiple units / modules.

[0105] Example 4

[0106] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the method provided in Embodiment 1 is implemented.

[0107] The readable storage medium may include, but is not limited to, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0108] In a possible implementation manner, the embodiment of the present invention may also be implemented in the form of a program product, which includes program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute a method for implementing any of the above embodiments.

[0109] The program code for executing the present invention may be written in any combination of one or more programming languages, and may be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on the remote device.

[0110] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A preheating control method, characterized in that: Applicable to a water heater, the water heater includes a heat exchanger, a water inlet pipe, a water outlet pipe, a two-way circulation pump and a switch valve, the water outlet end of the heat exchanger is connected to one end of the water outlet pipe, the water inlet end of the heat exchanger is connected to one end of the water inlet pipe, and the other end of the water outlet pipe is connected to the other end of the water inlet pipe through the two-way circulation pump and the switch valve to form a circulation pipeline; The preheating control method includes: In response to the preheating instruction, controlling the water heater to perform heating; Controlling the bidirectional circulation pump to run in the forward direction and the switch valve to open, so that water flows from the water inlet pipe into the water outlet pipe; After a first preset time period, the water heater is controlled to stop heating and the bidirectional circulation pump is controlled to run in reverse, so that water flows from the water outlet pipe into the water inlet pipe; After a second preset time period, the bidirectional circulation pump is controlled to stop running and the switch valve is closed; The preheating control method further includes: In response to the preheating instruction issued for the first time, controlling the water heater to perform heating; Controlling the bidirectional circulation pump to run in the forward direction and the switch valve to open, so as to preheat the water flow in the circulation pipe; If the temperature of the water flow in the circulation pipe reaches a preset temperature, the water heater is controlled to stop heating, the two-way circulation pump is controlled to stop running, and the switch valve is controlled to close; The preheating control method further includes: In response to the first preheating instruction, start timing; In response to the water heater stopping heating, stopping the timing and recording the duration as the full pipe heating duration; The first preset time duration and / or the second preset time duration are determined according to the full-tube heating time duration.

2. The preheating control method according to claim 1, wherein: The first preset duration is determined according to the full pipe heating duration and the proportion of the water outlet pipe to the circulation pipe.

3. A preheating control device, characterized in that: Applicable to a water heater, the water heater includes a heat exchanger, a water inlet pipe, a water outlet pipe, a two-way circulation pump and a switch valve, the water outlet end of the heat exchanger is connected to one end of the water outlet pipe, the water inlet end of the heat exchanger is connected to one end of the water inlet pipe, and the other end of the water outlet pipe is connected to the other end of the water inlet pipe through the two-way circulation pump and the switch valve to form a circulation pipeline; The preheating control device comprises: a preheating module, configured to control the water heater to perform heating in response to a preheating instruction; A forward operation module, used to control the forward operation of the bidirectional circulation pump and the opening of the switch valve, so that water flows from the water inlet pipe into the water outlet pipe; a reverse operation module, configured to control the water heater to stop heating and the bidirectional circulation pump to reversely operate after a first preset time period, so that water flows from the water outlet pipe into the water inlet pipe; A stopping module, configured to control the bidirectional circulation pump to stop running and the switch valve to close after a second preset time period; The preheating module is further configured to control the water heater to perform heating in response to a preheating instruction issued for the first time; The forward operation module is further used to control the forward operation of the bidirectional circulation pump and the opening of the switch valve to preheat the water flow in the circulation pipeline; The stopping module is further configured to control the water heater to stop heating, the bidirectional circulation pump to stop running, and the switch valve to close if the temperature of the water flow in the circulation pipe reaches a preset temperature; The preheating control device also includes: A timing start module, configured to start timing in response to a preheating instruction issued for the first time; A stop timing module, configured to stop timing in response to the water heater stopping heating, and record the duration as the heating duration of the entire pipe; The first preset time duration and / or the second preset time duration are determined according to the full-tube heating time duration.

4. The preheating control device according to claim 3, characterized in that: The first preset duration is determined according to the full pipe heating duration and the proportion of the water outlet pipe to the circulation pipe.

5. A water heater comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the preheating control method according to any one of claims 1 to 2 is implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the preheating control method according to any one of claims 1 to 2 is implemented.

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