CN114992876A - A gas water heater and its control method - Google Patents

Abstract

The invention discloses a gas water heater and a control method thereof, wherein the gas water heater comprises a plurality of fire grate segments, a fire grate segment which is currently burnt and a target fire grate segment are obtained, and the target fire grate segment is a fire grate segment corresponding to actually required heat; and judging whether the fire grate segment which is currently combusted can be directly switched to a target fire grate segment or not, if not, acquiring an intermediate fire grate segment, switching from the fire grate segment which is currently combusted to the intermediate fire grate segment, and then switching from the intermediate fire grate segment to the target fire grate segment. According to the method, the middle fire grate segment is selected by means of configuring the parameter table and the like, and when the current burning fire grate segment cannot be directly switched to the target fire grate segment, the correspondingly obtained middle fire grate segment is used for switching, so that the flexibility of segmented switching of the gas water heater can be increased, the universality of a program is met, the program space is reduced, the cost is reduced, and the development efficiency is improved; and simultaneously, the special sectional combustion requirement configured by a user household is met.

Description

Gas water heater and control method thereof

technical field

The invention belongs to the technical field of gas water heaters, and in particular relates to a gas water heater and a control method thereof.

Background technique

The gas water heater heats the water by burning gas. Usually, there are multiple fire row sections in the gas water heater. The combustion mode of the fire row sections is adjusted according to the user's needs, so that the gas water heater has different heating effects to meet the needs of users. Different needs of users.

General segmented gas water heaters are divided into three-segment, four-segment, five-segment and other segmented methods. When the heat demand changes, different segmented combustion needs to be used, which involves the control of fire transfer. question. During the fire transfer process of the gas water heater, fire transfer can only be carried out between two adjacent fire row sections. In the existing gas-fired water heaters, due to the fixed program of the segmented valve-cutting method, the valve-cutting program of the gas-fired water heater cannot be flexible; at the same time, the existing segmented valve-cutting method cannot be compatible with a variety of valve-cutting methods, and cannot meet the needs of users' homes special staged combustion requirements.

In view of this, the present invention is proposed.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a gas water heater and a control method thereof, which can increase the flexibility of segment switching of the gas water heater, satisfy the versatility of programs, reduce program space, and reduce costs. The purpose of improving the development efficiency is to achieve the purpose of timely adjusting the switching mode of the fire exhaust section according to different combustion programs of the gas water heater and improving the combustion efficiency by providing a gas water heater and a control method thereof.

In order to solve the above-mentioned technical problems, the basic conception of the technical scheme adopted in the present invention is:

A method for controlling a gas-fired water heater, the gas-fired water heater includes a plurality of burner segments, and a currently burning burner segment and a target burner segment are obtained, wherein the target burner segment is corresponding to the actual heat demand. fire section;

Determine whether the currently burning fire section can be directly switched to the target fire section, if not, obtain the middle fire section, switch from the currently burning fire section to the middle fire section, and then switch from the middle fire section The segment switches to the target fire row segment.

Preferably, the judging whether the currently burning burner section can be directly switched to the actual heat demand target burner section includes querying all the currently burning burner sections from a pre-stored burner section switching mode. For the directly switched fire section, according to the query result, determine whether the currently burning fire section can be directly switched to the target fire section; preferably, a configuration parameter table is pre-stored, and a plurality of fire sections are pre-stored in the parameter configuration table section, and pre-stores the configuration relationship of whether each fire row section can be directly switched.

Preferably, the acquiring the intermediate fire section includes: obtaining the fire section that can be directly switched from the current combustion fire section from the pre-stored fire section switching mode, and judging whether the acquired fire section can be Directly switch to the target fire section, if so, set the acquired fire section as the middle fire section.

Preferably, if it is obtained that there are multiple burner sections that can be directly switched from the current combustion burner section, and the obtained multiple burner sections can be directly switched to the target burner section, the detection and acquisition Check whether there are faults in the multiple fire row sections obtained, and set the fire row section without fault as the middle fire row section.

Alternatively, if it is obtained that there are multiple burner sections that can be directly switched from the current combustion burner section, and the obtained multiple burner sections can be directly switched to the target burner section, determine the actual demand. When the amount of heat increases, the segment that provides more heat is prioritized and set as the middle segment; when it is judged that the actual heat demand decreases, the segment that provides less heat is prioritized and set as the middle segment.

Preferably, after switching from the currently burning burner section to the middle burner section, the intermediate burner section is switched to the target burner section after the combustion of the middle burner section is stable.

Preferably, the obtaining the currently burning fire exhaust section and the target fire exhaust section includes: obtaining the water flow rate of the gas water heater, the set water temperature and the inlet water temperature, and calculating the actual demand heat according to the water flow rate, the set water temperature and the inlet water temperature, According to the actual heat demand, the corresponding target fire exhaust segment is obtained.

Another object of the present invention is to provide a gas water heater using the above control method, including:

a plurality of fire row sections, a fire transfer sheet is arranged between two adjacent fire row sections, and the fire transfer sheet is used for fire transfer between two adjacent fire row sections;

Sectional valve, used to control the on-off between the fire exhaust section and the gas pipeline;

The main control board is used to control the opening or closing of the segment valve, and is connected with the segment valve.

Preferably, a storage device is included, and the storage device for storing the section switching mode of the fire row is integrated on the main control board; or, the memory is set independently and connected to the main control board.

Preferably, a flame detection device is provided to detect the stability of combustion on the section of the fire exhaust, and the flame detection device is connected to the main control board.

Preferably, a water temperature detection device is provided, the water temperature detection device is used to detect the inlet water temperature, and the water temperature detection device is connected to the main control board.

After adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art:

1. In the present invention, by selecting the intermediate fire row section, when the currently burning fire row section cannot be directly switched to the target fire row section, the intermediate fire row is selected according to the optimal principle according to the variable preset parameter configuration table and other methods. It can increase the flexibility of the segment switching of the gas water heater, meet the versatility of the program, reduce the program space, reduce the cost, and improve the development efficiency; at the same time, it can meet the needs of users to configure special segmented combustion. .

2. The present invention improves the success rate of the switchover of the burner section by switching to the target burner section after the intermediate burner section is stably combusted and then switches to the target burner section. The switchover failed due to unstable combustion of the burner section.

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort. In the attached image:

1 is a schematic flow chart of a control method for a gas water heater according to the present invention;

It should be noted that these drawings and written descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention , but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 , an embodiment of the present invention introduces a control method for a gas water heater. The gas water heater includes a plurality of burner sections, and obtains a currently burning burner section and a target burner section. The target burner section is obtained. The fire section is the fire section corresponding to the actual heat demand;

Determine whether the currently burning fire section can be directly switched to the target fire section, if not, obtain the middle fire section, switch from the currently burning fire section to the middle fire section, and then switch from the middle fire section The segment switches to the target fire row segment.

In the gas water heater, there are multiple fire row sections, and different fire row sections can be selected for combustion according to the different needs of users. For example, in summer, the ambient temperature is high, and the user wants the water temperature to be slightly lower when using the gas water heater. At this time, a small number of fire rows can be used for combustion to control the outlet water temperature of the gas water heater within the low temperature range desired by the user. In winter, when the ambient temperature is low, users hope that the water temperature is slightly higher when using the gas water heater. At this time, a large number of fire rows can be used for combustion to increase the outlet water temperature of the gas water heater. According to the different needs of users, different fire exhausts are used for combustion.

The present invention selects the middle burner section according to the optimization principle through the parameter configuration table. When the currently burning burner section cannot be directly switched to the target burner section, the intermediate burner section is switched to increase the number of gas water heaters. The flexibility of segment switching can meet the versatility of the program, reduce the program space, reduce the cost, and improve the development efficiency; at the same time, it can meet the special segment combustion requirements of the user's home configuration.

In this embodiment of the present invention, the judging whether the currently burning fire section can be directly switched to the target fire section includes querying all fire sections that can be switched from the currently burning fire section from a pre-stored fire section switching mode. For the directly switched fire section, according to the query result, it is judged whether the currently burning fire section can be directly switched to the target fire section.

In the gas water heater, there is a pre-existing fire row segment switching method. For each fire row segment, a fire row segment that can be directly switched is stored correspondingly. After the target fire row segment is obtained, the The switching method judges whether the currently burning flame segment can be directly switched to the target flame segment.

In this embodiment of the present invention, the acquiring the intermediate fire row segment includes acquiring, from a pre-stored fire row segment switching mode, a fire row segment that can be directly switched from the current combustion fire row segment, and judging the acquired fire row segment. Whether the section can be directly switched to the target fire section, if so, set the acquired fire section as the middle fire section.

There is a pre-existing switching mode of the fire exhaust section in the gas water heater. For example, for a five-section gas water heater with three section valves, it includes A section combustion, B section combustion, C section combustion, D section combustion, and E section combustion. In the A-stage combustion, the first segment valve is opened, and the second segment valve and the third segment valve are closed; in the B-stage combustion, the second segment valve is opened, and the first segment valve and the third segment valve are closed. valve; in C-stage combustion, open the first segment valve and the second segment valve, close the third segment valve; in D-stage combustion, open the first segment valve and the third segment valve, close the second segment valve Segment valve; in E-segment combustion, the first segment valve, the second segment valve and the third segment valve are all open. The switching methods include, the A-stage combustion and the B-stage combustion can be switched to each other, the A-stage combustion and the C-stage combustion can be switched to each other, the A-stage combustion and the D-stage combustion can be switched to each other, and the C-stage combustion and the E-stage combustion can be switched to each other. It can be switched to each other, and the D-stage combustion and E-stage combustion can be switched to each other.

If the current gas water heater is in the A-stage combustion, after calculating according to the user's use requirements, it is concluded that the gas-fired water heater should use the E-stage combustion. From the above switching method, it can be known that the A-stage combustion cannot be directly switched to the E-stage combustion. However, it is possible to switch from A-stage combustion to C-stage combustion, and from C-stage combustion to E-stage combustion, so when switching, first switch from A-stage combustion to C-stage combustion, and then switch from C-stage combustion to E-stage combustion, Meet the needs of users.

In the embodiment of the present invention, if it is obtained that there are multiple burner sections that can be directly switched from the current combustion burner section, and the obtained multiple burner sections can be directly switched to the target burner section , to detect whether there are faults in the obtained multiple fire exhaust sections, and set the non-faulty fire exhaust section as the intermediate fire exhaust section; for example, the current gas water heater is burning in section A, and the operation is carried out according to the user's needs. After calculation, it is concluded that the gas water heater should use E-stage combustion. From the switching method, it can be known that from A-stage combustion to C-stage combustion, it can also be switched to D-stage combustion, and both C-stage combustion and D-stage combustion can be switched to E-stage combustion. At this time, check whether there is a fault in the fire section of the C-section combustion and the fire section of the D section. If the fire section of the C-section combustion is faulty and the D-section combustion of the fire section is normal, then select the D section. Combustion, first switch from A-stage combustion to D-stage combustion, and then switch from D-stage combustion to E-stage combustion.

The invention detects whether there is a fault in the middle fire row section when there are multiple intermediate fire row sections, eliminates the existing fault, avoids the switching failure caused by the fault of the fire row section, and improves the working stability of the gas water heater .

Alternatively, in this embodiment of the present invention, it is also possible to obtain a plurality of burner sections that can be directly switched from the current combustion burner section, and the obtained multiple burner sections can be directly switched to Target fire row segment, when it is judged that the current actual heat demand has increased compared with the actual demand heat in the previous time period, the fire row segment that provides more heat is preferentially used and set as the middle fire row segment; When the actual heat demand in a period of time is lower than that of the actual heat demand, the fire row segment that provides less heat is preferentially used and set as the middle fire row segment; for example, the current gas water heater is burning in the A-section, and after calculation according to the user's use demand, we can obtain The gas water heater should use E-stage combustion. From the switching method, it can be known that from A-stage combustion to C-stage combustion, it can also be switched to D-stage combustion, and both C-stage combustion and D-stage combustion can be switched to E-stage combustion. At this time, the current actual heat demand is compared with the actual demand heat in the previous set time period. When the current actual heat demand is greater than the actual demand heat in the previous set time period, the C-stage combustion with higher combustion heat is selected. , first switch from A-stage combustion to C-stage combustion, and then switch from C-stage combustion to E-stage combustion; and when the current actual demand heat is less than the actual demand heat in the previous set time period, then select D with lower combustion heat Stage combustion, first switch from A stage combustion to D stage combustion, and then switch from D stage combustion to E stage combustion.

In the embodiment of the present invention, after switching from the currently burning burner section to the middle burner section, wait for the middle burner section to burn stably, and then switch from the middle burner section to the target burner section.

For example, the current gas water heater is in the A-stage combustion, after calculating according to the user's usage needs, it is concluded that the gas-fired water heater should use the E-stage combustion. Since A-stage combustion cannot be directly switched to E-stage combustion, it is necessary to switch from A-stage combustion to C-stage combustion first, and then switch from C-stage combustion to E-stage combustion. After switching from A-stage combustion to C-stage combustion, it is necessary to wait for C-stage combustion to stabilize, and then switch from C-stage combustion to E-stage combustion.

In the present invention, after switching to the middle fire row section, the intermediate fire row section is stably combusted and then switched from the middle fire row section to the target fire row section, so as to improve the success rate of the fire row section switching and avoid fire The bank stage combustion is unstable and the switchover fails.

In the embodiment of the present invention, the obtaining of the currently burning fire exhaust section and the target fire exhaust section includes obtaining the water flow rate, setting the water temperature and the inlet water temperature, and calculating the actual heat demand according to the water flow rate, the set water temperature and the inlet water temperature, Then according to the actual heat demand, the corresponding fire row segment is obtained as the target fire row segment.

When it is detected that the set water temperature is higher than the inlet water temperature, but the actual heat demand is not large, the gas water heater only needs to use a small firepower to heat the water, and when it is detected that the actual heat demand is large, the gas water heater needs to use a larger Great power to heat the water. When the gas water heater uses a smaller firepower, the burner section is not the same as the burner section when the gas water heater uses a large firepower.

The present invention calculates the target fire row segment according to the set water temperature and the inlet water temperature, and can accurately use the fire row segment corresponding to the user's requirement for combustion, thereby meeting the user's usage requirement.

The embodiment of the present invention introduces a gas water heater using the above control method. The gas water heater includes a plurality of fire row sections, and a fire transfer sheet is arranged between two adjacent fire row sections. The sheet is used to transmit fire between two adjacent fire row sections. When one fire row section burns, the flame can be transmitted to the adjacent fire row section through the fire transfer sheet, and the adjacent fire row section is burned. Segment ignition. There is also a sectional valve in the gas water heater, which is used to control the on-off between the section of the fire exhaust and the gas pipeline. When the section valve is opened, the gas pipeline is connected with the corresponding section of the fire exhaust, and the gas is transported. Combustion is carried out to the corresponding fire row section, and the opening or closing of the section valve is controlled by the main control board of the gas water heater. The gas water heater is also provided with a memory, which stores the section switching mode of the fire row. The memory can be integrated on the main control board; or the memory can be set independently and connected to the main control board. The gas water heater also includes: water flow detection device, flame detection device and water temperature detection device. The flame detection device is connected with the main control board to realize the communication transmission of different signals.

The gas water heater is also provided with a gas main valve, which is connected with the sectional valve, and a gas proportional valve is arranged between the gas main valve and the sectional valve, and the gas main valve is connected with the gas supply equipment through a gas pipeline. The gas supply equipment can provide gas, and the gas enters the gas water heater through the gas main valve. After the gas main valve is closed, the gas cannot enter the gas water heater. The gas proportional valve can adjust the opening, control the transmission rate of gas, and then control the fire power.

In the gas water heater, there are multiple fire row sections, and different fire row sections can be selected for combustion according to the different needs of users. For example, in summer, the ambient temperature is high, and the user wants the water temperature to be slightly lower when using the gas water heater. At this time, a small number of fire rows can be used for combustion to control the outlet water temperature of the gas water heater within the low temperature range desired by the user. In winter, when the ambient temperature is low, users hope that the water temperature is slightly higher when using the gas water heater. At this time, a large number of fire rows can be used for combustion to increase the outlet water temperature of the gas water heater. According to the different needs of users, different fire exhausts are used for combustion.

During the working process of the gas water heater, the inlet water temperature is first detected by the water temperature detection device, and the target fire row segment is calculated according to the water flow rate, the inlet water temperature and the water temperature set by the user, and the target fire row segment is corresponding to the actual heat demand. Fire row segment. Then, according to the switching mode of the flame block stored in the memory, it is judged whether the currently burning flame block can be directly switched to the target flame block. Switch to the middle fire section, then switch from the middle fire section to the target fire section. The opening of the section valve is controlled by the main control board, and then the on-off between the section of the fire exhaust and the gas pipeline is controlled. The gas is combusted to the corresponding fire exhaust section.

The invention selects the middle fire row section, when the currently burning fire row section cannot be directly switched to the target fire row section, the intermediate fire row section is switched, which can increase the flexibility of the section switching of the gas water heater. It can meet the versatility of the program, reduce the program space, reduce the cost, and improve the development efficiency; at the same time, it can meet the needs of special segmented combustion in the user's home configuration.

In actual use, a parameter table of valve switching types can be created in advance, a parameter is used to represent the valve switching type, and the parameters are called from the table when switching is required. For example, for a five-section gas water heater with three section valves, it includes A-section combustion, B-section combustion, C-section combustion, D-section combustion, and E-section combustion. In the A-stage combustion, the first segment valve is opened, and the second segment valve and the third segment valve are closed; in the B-stage combustion, the second segment valve is opened, and the first segment valve and the third segment valve are closed. valve; in C-stage combustion, open the first segment valve and the second segment valve, close the third segment valve; in D-stage combustion, open the first segment valve and the third segment valve, close the second segment valve Segment valve; in E segment combustion, the first segment valve, the second segment valve and the third segment valve are all open. The switching methods include, the A-stage combustion and the B-stage combustion can be switched to each other, the A-stage combustion and the C-stage combustion can be switched to each other, the A-stage combustion and the D-stage combustion can be switched to each other, and the C-stage combustion and the E-stage combustion can be switched to each other. It can be switched with each other, and the D-stage combustion and E-stage combustion can be switched with each other.

Since the three segment valves all have an open or closed state, corresponding to 1 and 0 in binary, each segment combustion can be represented by a binary number, with 0 in binary indicating that the segment valve is closed, and 1 in binary. Indicates that the segment valve is open. For a water heater with three segment valves, it can be represented by a 4-bit binary number. Since there are only three segment valves, the highest bit of the binary number is set to 0, and the remaining three bits are used to represent the three segments in turn. status of the valve. The binary number 0001b is used to represent the combustion of segment A, and the corresponding hexadecimal number is 0x01; the binary number 0010b is used to represent the combustion of segment B, and the corresponding hexadecimal number is 0x02; the binary number 0011b is used to represent the combustion of segment C, which corresponds to hexadecimal. The number is 0x03; the binary number 0101b is used to represent the D segment combustion, and the corresponding hexadecimal number is 0x05; the binary number 0x111b is used to represent the E segment combustion, and the corresponding hexadecimal number is 0x07. The parameter table of valve type is as follows:

/* Cut valve type time cut threshold */

{MOVE_TYPE_AB,15,150},/*A->B MOVE_TYPE_AB is 0x12*/

{MOVE_TYPE_BA,10,110},/*B->A MOVE_TYPE_BA is 0x21*/

{MOVE_TYPE_AC,15,150},/*A->C MOVE_TYPE_AC is 0x13*/

{MOVE_TYPE_CA,10,110},/*C->A MOVE_TYPE_CB is 0x31*/

{MOVE_TYPE_AD,15,150},/*A->D MOVE_TYPE_AD is 0x15*/

{MOVE_TYPE_DA,10,110},/*D->A MOVE_TYPE_DA is 0x51*/

{MOVE_TYPE_CE,15,150},/*C->E MOVE_TYPE_CE is 0x37*/

{MOVE_TYPE_EC,10,110},/*E->C MOVE_TYPE_EC is 0x73*/

{MOVE_TYPE_DE,15,150},/*D->E MOVE_TYPE_DE is 0x57*/

{MOVE_TYPE_ED,10,110},/*E->D MOVE_TYPE_ED is 0x75*/

For different types of gas water heaters, different cut-off valve type parameter tables can be defined. According to the valve cutting type parameter table defined by the segment valve, you can obtain which valve cutting methods are available when the valve is cut, and which configuration of the valve cutting type is used when the valve is cut. For different fire row sections and different valve cutting types, the program will be selected according to the valve cutting type parameter table, so as to realize a set of programs, different parameters support the valve cutting control of different sections, and realize the effect that the valve cutting process can be dynamically configured .

In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method so disclosed may be employed in any combination, unless at least some of such features and/or procedures or elements are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within and form different embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Without departing from the scope of the technical solution of the present invention, when the technical content indicated above can be used to make some changes or modifications to equivalent examples of equivalent changes, the implementations in the above-mentioned examples can also be further combined or replaced, but any Without departing from the content of the technical solution of the present invention, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the solution of the present invention.

Claims (10)

1. A control method of a gas water heater, which comprises a plurality of fire grate segments, is characterized in that,

acquiring a fire grate segment which is currently combusted and a target fire grate segment, wherein the target fire grate segment is a fire grate segment corresponding to actually required heat;

judging whether the fire grate segment of the current combustion can be directly switched to the target fire grate segment or not, if not, acquiring an intermediate fire grate segment, switching from the fire grate segment of the current combustion to the intermediate fire grate segment, and then switching from the intermediate fire grate segment to the target fire grate segment.

2. The control method of the gas water heater according to claim 1, wherein the judging whether the currently burning fire grate segment can be directly switched to the target fire grate segment requiring heat actually comprises inquiring all fire grate segments which can be directly switched from the currently burning fire grate segment from a prestored fire grate segment switching mode, and judging whether the currently burning fire grate segment can be directly switched to the target fire grate segment according to the inquiring result;

preferably, a configuration parameter table is prestored, a plurality of fire grate segments are prestored in the parameter configuration table, and a configuration relation whether each fire grate segment can be directly switched is prestored.

3. The control method of the gas water heater according to claim 1 or 2, wherein the acquiring the intermediate fire grate segment includes acquiring a fire grate segment that can be directly switched from a current combustion fire grate segment from a prestored fire grate segment switching manner, judging whether the acquired fire grate segment can be directly switched to a target fire grate segment, and if so, setting the acquired fire grate segment as the intermediate fire grate segment.

4. The control method of the gas water heater according to claim 3, wherein if a plurality of fire grate segments which can be directly switched from a current combustion fire grate segment are obtained and the obtained fire grate segments can be directly switched to a target fire grate segment, whether the obtained fire grate segments have faults or not is detected, and the fire grate segments without faults are set as middle fire grate segments;

or when the actually required heat is judged to be increased, the fire grate segment which provides more heat is preferentially used and set as the middle fire grate segment; and when the actual heat demand is reduced, preferentially using the fire grate segment which provides less heat as the middle fire grate segment.

5. The control method of the gas water heater according to any one of claims 1 to 4, wherein after the section of the fire grate which is currently burning is switched to the section of the intermediate fire grate, the section of the intermediate fire grate is switched to the section of the target fire grate after the combustion of the section of the intermediate fire grate is stabilized.

6. The method as claimed in any one of claims 1 to 5, wherein the step of obtaining the currently burning fire grate segment and the target fire grate segment comprises the steps of obtaining water flow, set water temperature and inlet water temperature of the gas water heater, calculating actual required heat according to the water flow, the set water temperature and the inlet water temperature, and obtaining the corresponding target fire grate segment according to the actual required heat.

7. A gas water heater using the control method as set forth in any one of claims 1 to 6, comprising:

the fire grate comprises a plurality of fire grate segments, wherein a fire transfer sheet is arranged between every two adjacent fire grate segments and used for transferring fire between every two adjacent fire grate segments;

the segment valve is used for controlling the connection and disconnection between the fire grate segment and the gas pipeline;

and the main control board is used for controlling the opening or closing of the sectional valve and is connected with the sectional valve.

8. The gas water heater of claim 7, including a storage device in which fire grate segment switching means are stored;

the storage device is integrated on the main control board;

or the memory is arranged independently and connected with the main control board.

9. The gas water heater of claim 7, wherein a flame detection device is provided for detecting the stability of combustion on the fire grate segment, the flame detection device being connected to the main control panel.

10. The gas water heater as claimed in claim 8, wherein a water temperature detecting means is provided for detecting the temperature of the inlet water, the water temperature detecting means being connected to the main control panel.

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