A water heater capable of accurately controlling the temperature of water use points and a control method thereof

Abstract

The present invention discloses a water heater capable of accurately controlling the temperature of a water point and a control method thereof, wherein the water heater comprises a water heater body, a water inlet pipe, a water outlet pipe, a gas control valve, a circulation pump, a return water temperature probe, a water outlet temperature probe and a control component, wherein the return water temperature probe is arranged on the water inlet pipe and is used to monitor the return water temperature T in real time. 回 The outlet water temperature probe is installed on the outlet water pipe and used to monitor the outlet water temperature T in real time. 出 The control component is electrically connected to the gas control valve, the circulation pump, the return water temperature probe and the outlet water temperature probe respectively; after starting the preheating function of the water heater, the control component can monitor the outlet water temperature T in real time. 出 and return water temperature T 回 Calculate the water point temperature T 用 , and according to the water point temperature T 用 With the target temperature T 目 The present invention can realize accurate control of the water point temperature, effectively prevent the water point temperature from being too hot or too cold after preheating, and improve the water use experience.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to a preheating temperature control technology for water heaters. Background Art

[0002] Zero cold water gas water heaters have become a trend in the water heater industry because they can provide hot water immediately after it is turned on. When the preheating function is activated, the built-in circulation pump drives the water in the hot water pipe and return pipe outside the machine to circulate and preheat. Conventional zero cold water gas water heaters generally monitor the return water temperature or the outlet water temperature to determine whether preheating is completed.

[0003] The control logic that determines whether preheating is completed by monitoring the return water temperature may have the following problems: 1. The water temperature at the actual water use point may be too hot or too cold. If it is too hot, it may easily scald people, and if it is too cold, it will waste water; 2. After preheating, the water temperature in the circulation pipeline is unevenly distributed, and the water temperature at water use points in different locations is different, which is quite different from the preset temperature, affecting the water use experience.

[0004] The control logic that determines whether preheating is completed by monitoring the outlet water temperature has the following problems: 1. When the preset temperature is low, after the preheating function is turned off, the actual water use point is some distance away from the water heater. Especially in winter, the water temperature is often lower than the preset temperature, and the effect of instant hot water cannot be achieved; 2. When the preset temperature is high, the water heater burns at a high load but cannot reach the expected temperature, wasting gas. Summary of the invention

[0005] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a water heater that can accurately control the temperature of the water use point, which can accurately control the temperature of the water use point, effectively prevent the temperature of the water use point from being too hot or too cold after preheating, and improve the water use experience.

[0006] The present invention also provides a control method for a water heater, which can ensure that the temperature of the pre-use water point meets the user's needs after heat reception, and effectively avoid the water point temperature from being overheated or overcooled.

[0007] According to the above-mentioned water heater capable of accurately controlling the temperature of water use points, it is realized by the following technical solutions:

[0008] A water heater capable of accurately controlling the temperature of a water point, comprising a water heater body, a water inlet pipe, a water outlet pipe, a gas control valve and a circulation pump arranged on the water inlet pipe, wherein the water heater also comprises a return water temperature probe, a water outlet temperature probe and a control component, wherein the return water temperature probe is arranged on the water inlet pipe and is used to monitor the return water temperature T in real time. 回 The outlet water temperature probe is arranged on the outlet water pipe and is used to monitor the outlet water temperature T in real time. 出The control component is electrically connected to the gas control valve, the circulation pump, the return water temperature probe and the outlet water temperature probe respectively; after the preheating function of the water heater is started, the control component can monitor the outlet water temperature T in real time. 出 and return water temperature T 回 Calculate the water point temperature T 用 , and according to the water point temperature T 用 With the target temperature T 目 The size relationship is used to determine whether to end preheating.

[0009] In some embodiments, the control component includes a main controller and an operation panel, the main controller is electrically connected to the gas control valve, the circulation pump, the return water temperature probe and the outlet water temperature probe, respectively, and the operation panel is electrically connected to the main controller and is provided with a preheating function key.

[0010] In some embodiments, it also includes a method for real-time monitoring of the ambient temperature T 环境 The ambient temperature probe is arranged on the water heater body and is electrically connected to the control component, and the control component is used to control the ambient temperature T 环境 Automatically adjust the target temperature T 目 .

[0011] According to the above-mentioned water heater control method, it is implemented by the following technical solutions:

[0012] A method for controlling a water heater, which uses a water heater capable of accurately controlling the temperature of a water point as described above, and the control method comprises the steps of:

[0013] S1: Continue to determine whether to start the preheating function of the water heater, and if so, proceed to the next step;

[0014] S2: Turn on the circulation pump and gas control valve, and the water heater ignites;

[0015] S3: Get the outlet water temperature T 出 and return water temperature T 回 , and according to the outlet water temperature T 出 and return water temperature T 回 Calculate the water point temperature T 用 ;

[0016] S4: Determine the water point temperature T 用 Is it greater than the target temperature T 目 If yes, go to the next step, if not, return to the previous step;

[0017] S5: Close the gas control valve and simultaneously or with a delay close the circulation pump to end preheating.

[0018] In some embodiments, in step S3, the water point temperature T 用 It is obtained by the following formula:

[0019] T 用 =T 出 -k(T 出 -T 回 ), where k is the water channel coefficient.

[0020] In some embodiments, the water channel coefficient is a ratio of the length of a hot water pipe of the water heater to the total length of a circulation pipe of the water heater, or the water channel coefficient is a fixed value or an manually set value.

[0021] In some embodiments, in step S4, the target temperature T 目 =Preset temperature T s ±Preheating temperature difference ΔT 预热 , wherein the preheating temperature difference ΔT 预热 is a fixed value, a manually set value, and the control component is set according to the preset temperature T s Automatic matching is obtained and determined by the control component according to the ambient temperature T 环境 Automatically match any of the above.

[0022] In some embodiments, the preheating temperature difference ΔT 预热 The control component is controlled according to the preset temperature T s Automatic matching is obtained, which is specifically obtained through the following formula:

[0023] Where T smin 、T smax , ΔT 预热max and ΔT 预热min All are fixed values ​​or manually set values.

[0024] In some embodiments, the preheating temperature difference ΔT 预热 The control component is based on the ambient temperature T 环境 The automatic matching is obtained, which specifically includes: after starting the preheating function of the water heater, the ambient temperature T is obtained through the ambient temperature probe 环境 , the control component sets the ambient temperature T 环境 Compare with the reference value and automatically match a preheating temperature difference ΔT based on the comparison result 预热 .

[0025] In some embodiments, the reference value includes the program maximum ambient temperature T 环境max and the minimum ambient temperature T 环境min , if T 环境 >T 环境max , then control the preheating temperature difference ΔT预热 Equal to the minimum preheating temperature difference ΔT 预热min ; if T 环境 <T 环境min , then control the preheating temperature difference ΔT 预热 Equal to the maximum preheating temperature difference ΔT 预热max ; if T 环境 ∈[T 环境min , T 环境max ], then the preheating temperature difference ΔT 预热 Determined by the following formula:

[0026] Where T 环境min 、T 环境max , ΔT 预热max and ΔT 预热min All are fixed values ​​or manually set values.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] The water heater of the present invention, after starting the preheating function, calculates the water use point temperature based on the real-time monitored water outlet temperature and return water temperature, and determines whether to end the preheating based on the relationship between the water use point temperature and the target temperature, thereby achieving precise control of the water use point temperature, ensuring that the water use point temperature meets user needs, preventing the water use point temperature from being too hot or too cold, and improving the water use experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of a water heater in Embodiment 1 of the present invention;

[0030] Figure 2 is a water temperature distribution diagram of the water heater circulation pipeline in Example 1 of the present invention;

[0031] Figure 3 is a flow chart of a method for controlling a water heater in Embodiment 1 of the present invention;

[0032] Figure 4 is a schematic diagram of the structure of a water heater in Embodiment 2 of the present invention;

[0033] Figure 5 4 is a graph showing the relationship between the preheating temperature difference and the ambient temperature in Example 2 of the present invention. DETAILED DESCRIPTION

[0034] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed by the present invention.

[0035] Example 1

[0036] In this embodiment, the water heater is a zero cold water gas water heater or a zero cold water dual purpose furnace. The electrical connection includes an electrical connection and a communication connection, wherein the communication connection includes a wireless communication connection and a wired communication connection.

[0037] See also Figure 1 The present embodiment provides a water heater capable of accurately controlling the temperature of water points, including a water heater body 1, a water inlet pipe 21, a water outlet pipe 22, a gas control valve 4 and a circulation pump 5. The gas control valve 4 is arranged on the ventilation passage inside the water heater body 1 and is used to control the on-off and opening degree of the gas. The circulation pump 5 is arranged on the water inlet pipe 21 and is used to increase the pressure and / or drive the water storage circulation of the water heater circulation pipeline. It also includes a return water temperature probe 6, an outlet water temperature probe 7 and a control component 8. The return water temperature probe 6 is arranged on the water inlet pipe 21 and is used to monitor the return water temperature T of the water inlet pipe 21 in real time. 回 The outlet water temperature probe 7 is arranged on the outlet water pipe 22 and is used to monitor the outlet water temperature T of the outlet water pipe 22 in real time. 出 The control component 8 is electrically connected to the gas control valve 4, the circulation pump 5, the return water temperature probe 6 and the outlet water temperature probe 7 respectively.

[0038] In addition, the water heater further includes a water inlet joint 23 and a water outlet joint 24. The water inlet joint 23 is mounted on the water heater body 1 and is connected to the external water inlet pipe 33 and the water inlet pipe 21 respectively. The water outlet joint 24 is mounted on the water heater body 1 and is connected to the water outlet pipe 22 and the external hot water pipe 31 respectively. The end of the external water inlet pipe 33 away from the water inlet joint 23 is connected to an external water source, and the external hot water pipe 31 is connected to the external water inlet pipe 33 through the return pipe 32. Thus, the hot water pipe 31, the return pipe 32 and the section of the external water inlet pipe 33 between the return pipe 32 and the water inlet joint 23 together constitute a circulation pipeline. When the water heater starts the preheating function of the water heater, the control component 8 can monitor the outlet water temperature T in real time. 出 and return water temperature T 回 Calculate the water point temperature T 用 , and according to the water point temperature T 用 With the target temperature T 目 The size relationship is used to determine whether to end preheating.

[0039] It can be seen that after the water heater of this embodiment starts the preheating function, the outlet water temperature T 出 and return water temperature T 回 Calculate the water point temperature T 用 , and according to the water point temperature T 用 With the target temperature T 目 The size relationship is used to determine whether to end preheating, thereby achieving precise control of the water use point temperature, ensuring that the water use point temperature meets user needs, preventing the water use point temperature from being too hot or too cold, and improving the water use experience.

[0040] Preferably, the return water temperature probe 6 is arranged on the water inlet pipe 21 and close to the water inlet joint 23.

[0041] In this way, the temperature of the water flowing into the water inlet pipe 21 from the water inlet joint 23 is substantially equal to the return water temperature probe 6 for real-time monitoring of the return water temperature T of the water inlet pipe 21. 回 The outlet water temperature probe 7 is arranged on the outlet water pipe 22 and close to the outlet water joint 24. In this way, the water temperature flowing out of the outlet water joint 24 can be ensured to be substantially equal to the outlet water temperature T of the outlet water pipe 22 monitored by the outlet water temperature probe 7 in real time. 出 .

[0042] See also Figure 1 Specifically, the control component 8 includes a main controller 81 and an operation panel 82. The main controller 81 is electrically connected to the gas control valve 4, the circulation pump 5, the return water temperature probe 6 and the outlet water temperature probe 7 respectively. The operation panel 82 is electrically connected to the main controller 81 and is provided with a preheating function key 821 and a temperature setting key. In this way, the user can use the preheating function key 821 to instantly turn on the preheating function or preset the start time of the preheating function, thereby improving the use flexibility of the water heater.

[0043] Preferably, the water point temperature T 用 It is obtained by the following formula: T 用 =T 出 -k(T 出 -T 回 ), where k is the water channel coefficient. In this embodiment, the water channel coefficient k is the ratio of the length of the hot water pipe 31 of the water heater to the total length of the circulation pipeline of the water heater. The total length of the circulation pipeline specifically refers to the sum of the hot water pipe 31, the return pipe 32 and the section of the external water inlet pipe 33 located between the return pipe 32 and the water inlet joint 23, that is, the total length of the water pipe from the water outlet joint 24 to the water inlet joint 23. In this way, the water point temperature T of the water heater is automatically adjusted according to the water channel system k. 用 , increase the water point temperature T 用 The adaptive performance effectively avoids the water point temperature T 用 After the preheating is over, the water channel coefficient k can be set to a fixed value or a manually set value set by the operation panel 82 to improve the water experience.

[0044] See also Figure 2 , Figure 2 is the water temperature distribution diagram of the water heater circulation pipeline. The water temperature of the circulation pipeline is inversely proportional to the length of the circulation pipeline. At the end of preheating or after the end of preheating, the water outlet temperature T at the water outlet of the water heater (i.e., the water outlet joint 24) is 出When hot water flows along the hot water pipe 31, the hot water temperature decreases as the hot water pipe 31 grows due to the heat dissipation of the pipe. When hot water flows through the water point (i.e., the hot water tap), the water point temperature T 用 Lower than the outlet water temperature T 出 At this time, the preheating temperature difference ΔT of this patent 预热 With the preset temperature T s The sum is equal to the water point temperature T 用 When the hot water flows along the return pipe 32 and the part of the external water inlet pipe 33 between the water inlet joint 23 and the return pipe 32 to the water inlet joint 23, the water inlet temperature T 进 The lowest temperature, and lower than the water point temperature T 用 .

[0045] from Figure 2 It can be clearly seen that when the conventional water heater is turned off and the pump is turned off, the outlet water temperature T 出 Or return water temperature T 回 (i.e. water inlet temperature) to determine whether preheating is over or completed. Although the water heater is preheated to the required temperature, the water point temperature T 用 Usually lower or higher than the required temperature, the temperature of the water in the circulation pipeline after preheating is unevenly distributed, and the water temperature at different water points is different, which is different from the preset temperature T s There are large differences, which affect the water experience. However, the patented water heater firstly calculates the water outlet temperature T 出 and return water temperature T 回 Calculate the water point temperature T 用 , and then according to the water point temperature T 用 With the target temperature T 目 The size relationship can determine whether to end preheating, and can accurately control the water point temperature T after preheating. 用 , and can prevent the water point temperature T 用 Too hot or too cold, improve the water experience.

[0046] Preferably, the target temperature T 目 =Preset temperature T s ±Preheating temperature difference ΔT 预热 , wherein the preset temperature T s is 35°C to 60°C, which is manually set by the user through the temperature setting key of the operation panel 82; the preheating temperature difference ΔT 预热 The temperature range is 0°C to 5°C, which can be a fixed value, a manually set value, or a preset value. s Automatically match any of the above.

[0047] More preferably, the preheating temperature difference ΔT of this embodiment 预热 , which is controlled by the main controller 81 according to the preset temperature Ts Automatic matching results in that the preheating temperature difference ΔT 预热 According to the preset temperature T s Automatic adjustment can be performed to enable the water heater to meet the water usage needs in different seasons and improve the adaptability of the water heater.

[0048] Specifically, the preheating temperature difference ΔT 预热 The control component is controlled according to the preset temperature T s Automatic matching is obtained, which is specifically obtained through the following formula:

[0049]

[0050] Where T smin 、T smax , ΔT 预热max and ΔT 预热min are fixed values ​​or manually set values. Preferably, T smin At 35°C, T smax is 60°C. Therefore, the main controller 81 controls the temperature according to the preset temperature T s Automatically match a preheating temperature difference ΔT 预热 , and the matched preheating temperature difference ΔT 预热 With the preset temperature T s There is a proportional linear relationship. In winter when the temperature is low, the circulation pipe of the water heater dissipates heat faster, and the preset temperature T set by the user s Higher, the preheating temperature difference ΔT 预热 As it increases, it is beneficial to increase the water temperature in the circulation pipeline to ensure sufficient preheating; in the summer when the temperature is high, the circulation pipeline of the water heater dissipates heat slowly, and the preset temperature T set by the user s Lower, the preheating temperature difference ΔT 预热 This not only shortens the preheating time of the water heater and reduces energy consumption, but also effectively prevents excessive water storage in the circulation pipeline from scalding users, thereby improving users' water use experience.

[0051] See also Figure 3 This embodiment also provides a method for controlling a water heater, which uses a water heater capable of accurately controlling the temperature of a water point as described above, and the control method comprises the steps of:

[0052] S1: Continue to determine whether to start the preheating function of the water heater, and if so, proceed to the next step;

[0053] Specifically, the water heater is in a power-on standby state, and the main controller 81 continuously determines whether the user immediately turns on the preheating function or presets the start time of the preheating function through the preheating function key 821. If the water heater immediately turns on the preheating function, it enters the preheating mode and directly proceeds to the next step; if the water heater presets the start time of the preheating function, it enters the preheating mode after the start time is reached, and proceeds to the next step.

[0054] S2: Turn on the circulation pump 5 and the gas control valve 4, and the water heater ignites;

[0055] Specifically, the circulation pump 5 is turned on to circulate the water in the circulation pipeline, and the gas control valve 4 is turned on to meet the gas required for the ignition of the water heater. The water heater is ignited after the ignition condition is met, and after the ignition is successful, the opening of the gas control valve 4 is automatically adjusted according to the operation of the water heater.

[0056] S3: Get the outlet water temperature T 出 and return water temperature T 回 , and according to the outlet water temperature T 出 and return water temperature T 回 Calculate the water point temperature T 用 ;

[0057] Specifically, the main controller 81 first obtains the return water temperature T through the return water temperature probe 6. 回 , and obtain the outlet water temperature T through the outlet water temperature probe 7 出 Then, the main controller 81 obtains the water outlet temperature T 出 and return water temperature T 回 , through T 用 =T 出 -k(T 出 -T 回 ) formula to calculate the water point temperature T 用 In this way, the water heater is guaranteed to be consistent with the water system k and the water outlet temperature T 出 and return water temperature T 回 To automatically adjust the water point temperature T of the water heater 用 , increase the water point temperature T 用 Adaptability to avoid water point temperature T 用 After the preheating is over, it will not be too hot or too cold, which will improve the water experience.

[0058] S4: Determine the water point temperature T 用 Is it greater than the target temperature T 目 If yes, go to the next step, if not, return to the previous step;

[0059] Specifically, the main controller 81 calculates the water point temperature T 用 , determine the water point temperature T用 Is it greater than the target temperature T 目 , if the water point temperature T 用 >Target temperature T 目 , if you go to the next step; if the water point temperature T 用 ≤ Target temperature T 目 , if you return to the next step, continue to obtain the outlet water temperature T 出 and return water temperature T 回 And calculate the water point temperature T 用 .

[0060] S5: Close the gas control valve 4, and simultaneously or with a delay close the circulation pump 5 to end preheating.

[0061] Specifically, when the main controller 81 determines that the water point temperature T 用 >Target temperature T 目 After that, the gas control valve 4 is controlled to be closed, so that the water heater stops heating. The circulation pump 5 can be closed at the same time as the gas control valve 4 is closed or delayed to be closed after the gas control valve 4 is closed, exiting the preheating mode and ending or completing the preheating. Preferably, the circulation pump 5 is delayed to be closed after the gas control valve 4 is closed, so that the water temperature distribution of the circulation pipeline after preheating can be more uniform, ensuring that the water temperature at each position of the circulation pipeline after preheating is the same, and further avoiding the water point temperature T 用 Overheating or overcooling after preheating can improve the preheating effect of the zero-cold water water heater and the user's water experience.

[0062] It can be seen that the control method of a water heater in this embodiment, after the preheating function is turned on, first obtains and then adjusts the temperature according to the outlet water temperature T 出 and return water temperature T 回 Calculate the water point temperature T 用 , and then according to the water point temperature T 用 With the target temperature T 目 The relationship between the size of the water point after preheating is determined to determine whether to end the preheating, and the water point temperature T after preheating is accurately controlled. 用 , effectively preventing the water point temperature T 用 Too hot or too cold, improve the water experience.

[0063] Preferably, the water channel coefficient k is the ratio of the length of the hot water pipe of the water heater to the total length of the circulation pipeline of the water heater, or the water channel coefficient is a fixed value or an artificially set value.

[0064] Preferably, the target temperature T 目 =Preset temperature T s ±Thermal temperature difference ΔT 预热 , wherein the preheating temperature difference ΔT 预热 It can be a fixed value, a manually set value, or a value set by the main controller 81 of the control component 8 according to a preset temperature Ts Automatically match any of the above.

[0065] Example 2

[0066] refer to Figure 4 The water heater of this embodiment is different from that of the first embodiment in that it further comprises an ambient temperature probe 9. The ambient temperature probe 9 is arranged on the water heater body 1 and is electrically connected to the main controller 81 of the control assembly 8, and is used to monitor the ambient temperature T of the water heater in real time. 环境 The main controller 81 of the control component 8 can be adjusted according to the ambient temperature T 环境 Automatically adjust the target temperature T 目 , the target temperature T 目 =Preset temperature T s ±Thermal temperature difference ΔT 预热 , wherein the preheating temperature difference ΔT 预热 The control component is based on the ambient temperature T 环境 Any one of the above is obtained by automatic matching, and the other parts are the same as those in Example 1.

[0067] It can be seen that the setting of the ambient temperature probe 9 enables the water heater to 环境 , automatically matches a preheating temperature difference ΔT 预热 , making the water heater more adaptable and adaptable to different ambient temperatures T throughout the year 环境 , water point temperature T 用 The control is more precise, meeting the water usage needs in different seasons and further improving the user experience.

[0068] In addition, the present embodiment provides a method for preparing a water heater, wherein the preheating temperature difference ΔT 预热 The control component is based on the ambient temperature T 环境 The automatic matching is obtained, which specifically includes: after starting the preheating function of the water heater, the ambient temperature T is obtained through the ambient temperature probe 9 环境 , the main controller 81 of the control component 8 sets the ambient temperature T 环境 Compare with the reference value and automatically match a preheating temperature difference ΔT based on the comparison result 预热 , so that by according to the ambient temperature T 环境 Compare the result with the reference value to automatically match a preheating temperature difference ΔT 预热 , further improving the adaptability of the water heater and better adapting to different ambient temperatures throughout the year 环境 , improve water experience.

[0069] Preferably, the reference value includes the program maximum ambient temperature T 环境max and the minimum ambient temperature T 环境min , if T环境 >T 环境max , then control the preheating temperature difference ΔT 预热 Equal to the minimum preheating temperature difference ΔT 预热min If T 环境 <T 环境min , then control the preheating temperature difference ΔT 预热 Equal to the maximum preheating temperature difference ΔT 预热max If T 环境 ∈[T 环境min , T 环境max ], then the preheating temperature difference ΔT 预热 Determined by the following formula:

[0070]

[0071] Where T 环境min 、T 环境max , ΔT 预热max and ΔT 预热min are fixed values ​​or manually set values. It can be seen from the above formula that the preheating temperature difference ΔT 预热 With ambient temperature T 环境 has an inverse linear relationship (see Figure 5 ), ambient temperature T 环境 The higher the preheating temperature difference ΔT 预热 It becomes smaller to adapt to different ambient temperatures throughout the year. In summer, the ambient temperature is higher and the heat dissipation of the water pipe is slower, which can match the smaller preheating temperature difference ΔT. 预热 ; The ambient temperature in winter is lower, and the water pipes dissipate heat faster, which can match the larger preheating temperature difference ΔT 预热 .

[0072] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A water heater capable of accurately controlling the temperature of a water point, comprising a water heater body, a water inlet pipe, a water outlet pipe, a gas control valve and a circulating pump arranged on the water inlet pipe, characterized in that: It also includes a return water temperature probe, an outlet water temperature probe and a control component. The return water temperature probe is arranged on the water inlet pipe and is used to monitor the return water temperature T in real time. 回 The outlet water temperature probe is arranged on the outlet water pipe and is used to monitor the outlet water temperature T in real time. 出 , the control assembly is electrically connected to the gas control valve, the circulation pump, the return water temperature probe and the outlet water temperature probe respectively; After the preheating function of the water heater is started, the control component can monitor the outlet water temperature T in real time. 出 and return water temperature T 回 Calculate the water point temperature T 用 , and according to the water point temperature T 用 With the target temperature T 目 The size relationship is used to determine whether to end preheating; Wherein, the water point temperature T 用 It is obtained by the following formula: T 用 =T 出 -k(T 出 -T 回 ), where k is the water path coefficient, which is the ratio of the length of the hot water pipe of the water heater to the total length of the circulation pipe of the water heater, or the water path coefficient k is a fixed value or an manually set value.

2. A water heater capable of accurately controlling the temperature of water points according to claim 1, characterized in that: The control component includes a main controller and an operation panel. The main controller is electrically connected to the gas control valve, the circulation pump, the return water temperature probe and the outlet water temperature probe respectively. The operation panel is electrically connected to the main controller and is provided with a preheating function key.

3. A water heater capable of accurately controlling the temperature of water points according to claim 1 or 2, characterized in that: Also includes a device for real-time monitoring of ambient temperature T 环境 The ambient temperature probe is arranged on the water heater body and is electrically connected to the control component, and the control component is used to control the ambient temperature T 环境 Automatically adjust the target temperature T 目 .

4. A method for controlling a water heater, characterized in that: The water heater capable of accurately controlling the water point temperature as claimed in any one of claims 1 to 3 is used, and the control method comprises the steps of: S1: Continue to determine whether to start the preheating function of the water heater, and if so, proceed to the next step; S2: Turn on the circulation pump and gas control valve, and the water heater ignites; S3: Get the outlet water temperature T 出 and return water temperature T 回 , and according to the outlet water temperature T 出 and return water temperature T 回 Calculate the water point temperature T 用 ; S4: Determine the water point temperature T 用 Is it greater than the target temperature T 目 If yes, go to the next step, if not, return to the previous step; S5: Close the gas control valve and simultaneously or with a delay close the circulation pump to end preheating.

5. A water heater control method according to claim 4, characterized in that: In step S4, the target temperature T 目 =Preset temperature T s ±Preheating temperature difference ΔT 预热 , the preheating temperature difference ΔT 预热 is a fixed value, a manually set value, and the control component is set according to the preset temperature T s Automatic matching is obtained and determined by the control component according to the ambient temperature T 环境 Automatically match any of the above.

6. A water heater control method according to claim 5, characterized in that: The preheating temperature difference ΔT 预热 The control component is controlled according to the preset temperature T s Automatic matching is obtained, which is specifically obtained through the following formula: Where T smin 、T smax , ΔT 预热max and ΔT 预热min All are fixed values ​​or manually set values.

7. A water heater control method according to claim 5, characterized in that: The preheating temperature difference ΔT 预热 The control component is based on the ambient temperature T 环境 The automatic matching is obtained, which specifically includes: after starting the preheating function of the water heater, the ambient temperature T is obtained through the ambient temperature probe 环境 , the control component sets the ambient temperature T 环境 Compare with the reference value and automatically match a preheating temperature difference ΔT based on the comparison result 预热 .

8. A water heater control method according to claim 7, characterized in that: The reference value includes the maximum ambient temperature T 环境max and the minimum ambient temperature T 环境min , if T 环境 >T 环境max , then control the preheating temperature difference ΔT 预热 Equal to the minimum preheating temperature difference ΔT 预热min ; if T 环境 <T 环境min , then control the preheating temperature difference ΔT 预热 Equal to the maximum preheating temperature difference ΔT 预热max ; if T 环境 ∈[T 环境min , T 环境max ], then the preheating temperature difference ΔT 预热 Determined by the following formula: Where T 环境min 、T 环境max , ΔT 预热max and ΔT 预热min All are fixed values ​​or manually set values.

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