Control method of gas heating stove

Abstract

The invention discloses a control method of a gas heating stove. The gas heating stove comprises a fan, a combustor, a gas valve, a main heat exchanger, a plate heat exchanger and a heating assembly. The control method comprises the steps that after the hot water using end uses water, water closing time is calculated; controlling the three-way valve to switch to a hot water position; judging whether the water cut-off time is longer than the self-learning water cut-off time or not; if yes, the three-way valve is switched to a heating position; if not, the outlet water temperature of the hot water using end is detected, whether the outlet water temperature is smaller than a first temperature threshold value or not is judged, and if not, the three-way valve is kept at the hot water position; if yes, a gas valve is opened; the outlet water temperature of the hot water using end is detected, whether the outlet water temperature of the hot water using end is smaller than a second temperature threshold value or not is judged, and if not, a gas valve is opened; and if yes, closing the gas valve, and returning to calculate the water closing time. The self-learning water cut-off time is set, the three-way valve is located at the hot water position, the gas heating stove is kept in the hot water mode, and the set temperature can be rapidly reached after water is boiled next time.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliances, and particularly relates to a control method for a gas heating furnace. Background Art

[0002] At present, a gas heating system mainly includes a water circuit system (pipes, valves and elbows), a heat dissipation system (radiators, etc.) and a heat source (gas heating furnace). A gas heating furnace is a commonly used device for winter heating in cold regions, and has an internal circulation water circuit for heating and an external circulation water circuit for domestic water, that is, it has both the functions of heating and supplying domestic hot water. When the gas heating furnace operates to supply domestic hot water, the water temperature is unstable, resulting in uncomfortable use of hot water.

[0003] The existing Chinese patent with the publication number CN110594855A discloses a control method for a gas heating furnace with variable bathing heat load and a gas heating furnace. The method includes the following steps: Step S1: Start the gas heating furnace; Step S2: Determine whether there is a bathing demand. If not, continue to execute the heating function. If so, collect the current inlet water temperature T; Step S3: Automatically match the maximum bathing heat load required when performing the bathing operation according to the current inlet water temperature T; Step S4: Then adjust the fan speed according to the maximum bathing heat load; Step S5: Start to execute the bathing function.

[0004] Adopting the above method, during the bathing process of the user, when the water is turned off midway, it will switch to the heating mode. If there is no heating demand, the water pump does not operate. After the water is turned on again, it takes a long time to heat up to the required temperature. In view of this, how to design a gas heating furnace technology that can quickly and stably provide domestic hot water to improve the user experience is the technical problem to be solved by the present invention. Summary of the Invention

[0005] The present invention provides a control method for a gas heating furnace, which realizes reducing the fluctuation of domestic hot water, quickly and stably providing domestic hot water, so as to improve the user experience of the gas heating furnace.

[0006] To achieve the above technical purpose, the present invention is realized by adopting the following technical solutions: In one aspect, the present invention provides a control method for a gas heating furnace, the gas heating furnace comprising a blower, a burner, a gas valve, a main heat exchanger, a plate heat exchanger and a heating assembly; the blower is configured to supply air to the burner, the gas valve is used to control the opening and closing of the burner, and the burner is used to heat the main heat exchanger; the main heat exchanger is communicated with a main heat exchange pipeline, the water inlet of the heated end of the plate heat exchanger is communicated with a tap water inlet, the water outlet of the heated end of the plate heat exchanger is communicated with a hot water using end, a temperature sensor is arranged at the water outlet position of the hot water using end, and a circulation pump is arranged on the main heat exchange pipeline; the main heat exchange pipeline is respectively communicated with the heating end of the plate heat exchanger and the heating assembly through a three-way valve, and the three-way valve can be switched between a hot water position and a heating position; the control method comprises the following steps: After the water use at the hot water using end ends, calculate the water closing time; Control the three-way valve to switch to the hot water position; Judge whether the water closing time is greater than the self-learning water stopping time; If so, control the three-way valve to switch to the heating position; If not, detect the water outlet temperature of the hot water using end, and judge whether the water outlet temperature of the hot water using end is less than a first temperature threshold. If not, return to keep the three-way valve in the hot water position; If so, open the gas valve; Detect the water outlet temperature of the hot water using end, and judge whether the water outlet temperature of the hot water using end is less than a second temperature threshold. If not, open the gas valve; If so, close the gas valve, and return to calculate the water closing time.

[0007] Compared with the prior art, the advantages and positive effects of the present invention are: by setting the self-learning water stopping time, during a period when the user stops using hot water midway, the three-way valve is in the hot water position, and the gas heating furnace remains in the hot water mode. After the next hot water is turned on, the set temperature can be quickly reached. If during the waiting process, the water outlet temperature of the hot water using end drops too fast, the gas valve of the gas heating furnace can be opened to always keep the water temperature in the main heat exchange pipeline in the hot water mode from being too low, avoiding a section of unheated cold water immediately following the user's hot water use.

[0008] In some embodiments of the present application, the first temperature threshold is greater than the second temperature threshold.

[0009] By determining whether the outlet water temperature at the hot water end is less than the first temperature threshold, if not, continue to keep the three-way valve in the hot water position; if so, then open the gas valve; determine whether the outlet water temperature at the hot water end is less than the second temperature threshold, if not, then open the gas valve, and the first temperature threshold is greater than the second temperature threshold. In this way, after the user stops using hot water for a period of time, the water temperature can be prevented from dropping too fast.

[0010] In some embodiments of the present application, when the three-way valve is in the hot water position, control the circulation pump to operate continuously.

[0011] By controlling the circulation pump to operate continuously when the three-way valve is in the hot water position, in this way, after the next hot water is turned on, since the circulation pump has been started, the consistency of the water temperature in the main heat exchanger, the plate heat exchanger and the main heat exchange pipeline can be ensured.

[0012] In some embodiments of the present application, when controlling the three-way valve to be in the hot water position, control the fan to operate continuously.

[0013] By controlling the fan to operate continuously when the three-way valve is in the hot water position, the excess heat generated by the burner can be taken away to ensure that there is no over-temperature phenomenon after the hot water is turned on again.

[0014] In some embodiments of the present application, the rotational speed of the fan is at the ignition rotational speed.

[0015] By controlling the three-way valve to be in the hot water position and setting the rotational speed of the fan at the ignition rotational speed, it is convenient for the burner to quickly ignite and provide heat for the main heat exchanger.

[0016] In some embodiments of the present application, when controlling the three-way valve to switch to the heating position, control the operation of the circulation pump and the fan according to the actual heating demand.

[0017] By controlling the three-way valve to switch to the heating position and controlling the operation of the circulation pump and the fan according to the actual heating demand, the heating cycle and the hot water supply cycle do not conflict with each other.

[0018] In some embodiments of the present application, the start logic of the program for self-learning the water cut-off time includes the following steps: Detect the water flow at the hot water end, and determine whether the water flow at the hot water end is greater than the first flow threshold. If not, do not start the program for self-learning the water cut-off time; if so, then detect the continuous water use time at the hot water end; Determine whether the continuous water use time at the hot water end lasts for the first time threshold. If not, do not start the program for self-learning the water cut-off time; if so, record the current water cut-off time; Determine whether the program for self - learning the water cut - off time is started according to the current water cut - off time.

[0019] By setting the start logic of the program for self - learning the water cut - off time, self - learning can be carried out according to the hot - water usage habits of different users, which is convenient for users to use hot water; judge whether the water flow at the hot - water end is greater than the first flow threshold. When the water flow at the hot - water end is less than the first flow threshold, the program for self - learning the water cut - off time does not need to be started; if it is greater than the first flow threshold, then detect the continuous water - using time at the hot - water end. If the continuous water - using time is short, shorter than the first time threshold, the program for self - learning the water cut - off time does not need to be started; if the continuous water - using time continuously exceeds the first time threshold, record the current water cut - off time, and determine whether the program for self - learning the water cut - off time is started according to the current water cut - off time.

[0020] In some embodiments of the present application, determining whether the program for self - learning the water cut - off time is started according to the current water cut - off time includes the following steps: When the current water cut - off time is greater than or equal to the first time threshold and less than or equal to the second time threshold, start the program for self - learning the water cut - off time; When the current water cut - off time is less than the first time threshold or greater than the second time threshold, do not start the program for self - learning the water cut - off time.

[0021] By judging the magnitude of the current water cut - off time, it is convenient to determine whether the program for self - learning the water cut - off time is started according to the hot - water usage habits of users; when the current water cut - off time is greater than or equal to the first time threshold and less than or equal to the second time threshold, start the program for self - learning the water cut - off time; when the current water cut - off time is less than the first time threshold or greater than the second time threshold, do not start the program for self - learning the water cut - off time.

[0022] In some embodiments of the present application, the determination of the self - learning water cut - off time includes the following steps: Start the program for self - learning the water cut - off time; Record the current water cut - off time; Determine the self - learning water cut - off time t' according to the current water cut - off time.

[0023] By starting the program for self - learning the water cut - off time, recording the current water cut - off time, and determining the self - learning water cut - off time t' according to the current water cut - off time, after starting the program for self - learning the water cut - off time, each water cut - off time can be used as a reference for the self - learning water cut - off time t'.

[0024] In some embodiments of the present application, determining the self - learning water cut - off time t' according to the current water cut - off time includes: Determine whether the current water cut-off time is greater than the water cut-off time t'' of the existing program. If so, the self-learning water cut-off time t' = t + δt; if not, determine whether the existing program water cut-off time t'' continuously maintains the third time threshold t3; If the existing program water cut-off time t'' continuously maintains the third time threshold t3, then the self-learning water cut-off time t' = t + δt; If the time that the existing program water cut-off time t'' continuously maintains is less than the third time threshold t3, then the self-learning water cut-off time t' = t''. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of a gas heating furnace provided by an embodiment of the present disclosure; Figure 2 It is a schematic diagram of a control method for a gas heating furnace provided by an embodiment of the present disclosure; Figure 3 It is a schematic diagram of a startup logic method for a self-learning water cut-off time program of a gas heating furnace provided by an embodiment of the present disclosure; Figure 4 It is a schematic diagram of a method for determining the self-learning water cut-off time of a gas heating furnace provided by an embodiment of the present disclosure; Figure 5 It is a schematic diagram of another method for determining the self-learning water cut-off time of a gas heating furnace provided by an embodiment of the present disclosure.

[0027] Description of the Reference Numerals: Combustion chamber 1; Burner 2; Main heat exchanger 3; Fan 4; Gas valve 5; Plate heat exchanger 6; Main heat exchange pipeline 7, circulation pump 71, exhaust valve 72; Three-way valve 8; Heating assembly 9; Water inlet pipe 10; Water outlet pipe 11. Detailed Embodiments

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the present invention, unless otherwise clearly defined and limited, the terms such as "install", "connect", "couple", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0032] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0033] An embodiment of the present disclosure provides a control method for a gas heating furnace. The gas heating furnace includes a combustion chamber, a burner 2, a main heat exchanger 3, a plate heat exchanger 6, a blower 4, a control system, a gas valve 5, and a heating assembly 9.

[0034] Combined with Figure 1 As shown, a combustion cavity is formed in the combustion chamber, and a burner 2, a main heat exchanger 3, and a gas valve 5 are arranged in the combustion cavity; the blower 4 is arranged above the burner 2, and the blower 4 is configured to supply air to the burner 2 and discharge the flue gas generated by the combustion of the burner 2 out of the combustion chamber. The gas valve 5 controls the opening and closing of the burner 2, and the burner 2 is used to heat the main heat exchanger 3; the main heat exchanger 3 is arranged in the main heat exchange pipeline 7, and the heat supply end of the plate heat exchanger 6 and the main heat exchanger 3 are connected through the main heat exchange pipeline 7. The water inlet of the heat receiving end of the plate heat exchanger 6 is connected to the tap water inlet through the water inlet pipe 10, and the water outlet of the heat receiving end of the plate heat exchanger 6 is connected to the hot water using end through the water outlet pipe 11. A temperature sensor and a water flow sensor are arranged at the water outlet position of the hot water using end. A circulation pump 71 is arranged on the main heat exchange pipeline 7, and an exhaust valve 72 is connected to the circulation pump 71; the main heat exchange pipeline 7 is respectively connected to the heat supply end of the plate heat exchanger 6 and the heating assembly 9 through a three-way valve 8. The heating assembly 9 is arranged in parallel at both ends of the plate heat exchanger 6, and the three-way valve 8 can be switched between the hot water position and the heating position.

[0035] The processor of the gas heating furnace is communicatively connected to the temperature sensor and the water flow sensor to obtain the outlet water temperature and flow rate of the water using end.

[0036] Combined with Figure 2 As shown, the control method of the gas heating furnace includes the following steps: S201, after the water using at the hot water using end ends, the control system calculates the water closing time; S202, the control system controls the three-way valve 8 to switch to the hot water position; S203, the control system determines whether the water closing time is greater than the self-learning water stop time; S204, if so, the control system controls the three-way valve 8 to switch to the heating position; S205, if not, the control system controls the temperature sensor to detect the outlet water temperature of the hot water end, and determines whether the outlet water temperature of the hot water end is less than the first temperature threshold. If not, return to step S202; S206, if so, the control system opens the gas valve 5; S207, the control system detects the outlet water temperature of the hot water end, and determines whether the outlet water temperature of the hot water end is less than the second temperature threshold. If not, return to step S206; S209, if so, the control system closes the gas valve 5 and returns to step S201.

[0037] Set the first dimensional threshold T1 and the second temperature threshold T2, and store them in the processor. Among them, T1 > T2. Exemplarily, T1 is 8K and T2 is 5K.

[0038] By setting the self-learning water cut-off time, during a period when the user stops using hot water midway, the three-way valve 8 is in the hot water position, and the gas heating furnace remains in the hot water mode. After the next hot water is turned on, the set temperature can be quickly reached. If the outlet water temperature of the hot water end drops too fast during the waiting process, the gas valve 5 of the gas heating furnace can be opened to always keep the water temperature in the main heat exchange pipeline 7 in the hot water mode from being too low, avoiding a section of unheated cold water immediately following the user's use of hot water.

[0039] Specifically, the first temperature threshold T1 is greater than the second temperature threshold T2. In this way, the water temperature can be prevented from dropping too fast after the user stops using hot water for a period of time.

[0040] Combined Figure 2 As shown, the embodiments of the present disclosure provide a control method for a gas heating furnace. S201, after the water usage at the hot water end is finished, the control system calculates the water cut-off time; S202, the control system controls the three-way valve 8 to switch to the hot water position; S211, the control system controls the circulation pump 71 to continuously operate; S212, the control system controls the blower 4 to continuously operate; S203, the control system determines whether the water cut-off time is greater than the self-learning water cut-off time; S204, if so, the control system controls the three-way valve 8 to switch to the heating position; S205, if not, the control system controls the temperature sensor to detect the outlet water temperature of the hot water end, and determines whether the outlet water temperature of the hot water end is less than the first temperature threshold. If not, return to step S202; S206, if so, the control system opens the gas valve 5; S207, the control system detects the water outlet temperature of the hot water end for use, and determines whether the water outlet temperature of the hot water end for use is less than the second temperature threshold. If not, it returns to step S206; S208, if so, the control system closes the gas valve 5 and returns to step S201.

[0041] Specifically, when the three-way valve 8 is in the hot water position, the control system keeps the circulation pump 71 running continuously. In this way, when the water is turned on next time, since the circulation pump 71 has already started, the time for starting the circulation pump 71 is saved. Under the action of the circulation pump 71, the hot water in the main heat exchanger 3 continuously enters the plate heat exchanger 6, providing heat source for the plate heat exchanger 6; it is beneficial to the consistency of the water temperature in the main heat exchanger 3, the plate heat exchanger 6 and the main heat exchange pipeline 7, and avoids the water temperature in the main heat exchanger 3 being too high to scald users.

[0042] Specifically, when the three-way valve 8 is controlled to be in the hot water position, the control system keeps the blower 4 running continuously. On the one hand, the operation of the blower 4 can take away the excess heat generated by the burner 2, ensuring that there will be no over-temperature phenomenon after the water is turned on again; on the other hand, after the water is turned on next time, the blower 4 has already started and can be ready to ignite the burner 2 at any time.

[0043] In some embodiments of the present application, in step S212, the rotational speed of the blower 4 is at the ignition rotational speed.

[0044] Specifically, when the three-way valve 8 is controlled to be in the hot water position, the rotational speed of the blower 4 is at the ignition rotational speed, so that it is convenient for the burner 2 to ignite quickly and provide heat for the main heat exchanger 3.

[0045] In some embodiments of the present application, when the three-way valve 8 is controlled to switch to the heating position, the operation of the circulation pump 71 and the blower 4 is controlled according to the actual heating demand.

[0046] Specifically, when the three-way valve 8 is controlled to switch to the heating position, the operation of the circulation pump 71 and the blower 4 is controlled according to the actual heating demand, and there is no conflict between the heating cycle and the hot water supply cycle.

[0047] In some embodiments of the present application, the start logic of the program for self-learning the water cut-off time includes the following steps: S301, detect the water flow rate of the hot water end for use, and determine whether the water flow rate of the hot water end for use is greater than the first flow rate threshold; S302, if not, do not start the program for self-learning the water cut-off time; S303, if so, detect the continuous water use time of the hot water end for use, and determine whether the continuous water use time of the hot water end for use lasts for the first time threshold; if not, execute S302; S304, if so, record the current water cut-off time; S305. Determine whether the program for self-learning the water cut-off time is started according to the current water cut-off time.

[0048] Specifically, by setting the start logic of the program for self-learning the water cut-off time, self-learning can be performed according to the hot water usage habits of different users, facilitating the user to use hot water. Determine whether the water flow rate at the hot water end is greater than the first flow rate threshold. When the water flow rate at the hot water end is less than the first flow rate threshold, the program for self-learning the water cut-off time does not need to be started. If it is greater than the first flow rate threshold, then detect the continuous water usage time at the hot water end. If the continuous water usage time is short, shorter than the first time threshold, then the program for self-learning the water cut-off time does not need to be started. If the continuous water usage time continuously exceeds the first time threshold, then record the current water cut-off time, and determine whether the program for self-learning the water cut-off time is started according to the current water cut-off time.

[0049] In some other embodiments of the present application, in combination with Figure 3 As shown, the start logic of the program for self-learning the water cut-off time includes the following steps: S301. Detect the water flow rate at the hot water end, and determine whether the water flow rate at the hot water end is greater than the first flow rate threshold; S302. If not, then do not start the program for self-learning the water cut-off time; S303. If so, then detect the continuous water usage time at the hot water end, and determine whether the continuous water usage time at the hot water end continuously reaches the first time threshold; if not, then execute S302; S304. If so, then record the current water cut-off time; S311. Determine whether the current water cut-off time is less than the first time threshold. If so, then execute S302; S312. If not, then start the program for self-learning the water cut-off time; S313. Detect the current water cut-off time, and determine whether the current water cut-off time is greater than the second time threshold. If so, then execute S302; if not, then execute S312.

[0050] Set the first time threshold t1 and the second time threshold t2, and the current water cut-off time t, and store them in the processor. Among them, t1 < t2. Exemplarily, t1 is 3 min, and t2 is 10 min.

[0051] Specifically, by judging the magnitude of the current water cut-off time, it is convenient to determine whether the program for self-learning the water cut-off time is started according to the user's hot water usage habits; when the current water cut-off time is greater than or equal to the first time threshold and less than or equal to the second time threshold, start the program for self-learning the water cut-off time; when the current water cut-off time is less than the first time threshold or greater than the second time threshold, do not start the program for self-learning the water cut-off time.

[0052] In some embodiments of the present application, in combination with Figure 4 as shown, the determination of the self-learning water cut-off time includes the following steps: S401, start the self-learning water cut-off time program; S402, record the current water cut-off time t; S403, determine the self-learning water cut-off time t' according to the current water cut-off time t.

[0053] Specifically, by starting the self-learning water cut-off time program, recording the current water cut-off time t, and determining the self-learning water cut-off time t' according to the current water cut-off time, after starting the self-learning water cut-off time program, each water cut-off time can be used as a reference for the self-learning water cut-off time t'.

[0054] In some other embodiments of the present application, in combination with Figure 5 as shown, the determination of the self-learning water cut-off time includes the following steps: S401, start the self-learning water cut-off time program; S402, record the current water cut-off time t; S411, determine whether the current water cut-off time t is greater than the water cut-off time t'' of the existing program; S412, if so, the self-learning water cut-off time t' = t + δt; S413, if not, determine whether the water cut-off time t'' of the existing program continuously maintains the third time threshold t3; if so, execute S412; S414, if not, the self-learning water cut-off time t' = t''.

[0055] The embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above control method of the gas heating furnace.

[0056] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0057] The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of the embodiments of the present disclosure. The foregoing storage medium may be a non-transient storage medium, including: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes, or may also be a transient storage medium.

[0058] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups thereof. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. In this article, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0059] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0060] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0061] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to the embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a gas heating furnace, the gas heating furnace including a blower, a burner, a gas valve, a main heat exchanger, a plate heat exchanger, and a heating assembly; the blower is configured to supply air to the burner, the gas valve is used to control the opening and closing of the burner, and the burner is used to heat the main heat exchanger; the main heat exchanger is communicated with a main heat exchange pipeline, the water inlet of the heated end of the plate heat exchanger is communicated with a tap water inlet, the water outlet of the heated end of the plate heat exchanger is communicated with a hot water using end, a temperature sensor is provided at the water outlet position of the hot water using end, and a circulation pump is provided on the main heat exchange pipeline; the main heat exchange pipeline is respectively communicated with the heating end of the plate heat exchanger and the heating assembly through a three-way valve, and the three-way valve can be switched between a hot water position and a heating position; It is characterized in that, The control method includes the following steps: After the water use at the hot water using end ends, calculate the water shut-off time; Control the three-way valve to switch to the hot water position; Judge whether the water shut-off time is greater than the self-learning water shut-off time; If so, control the three-way valve to switch to the heating position; If not, detect the water outlet temperature of the hot water using end, and judge whether the water outlet temperature of the hot water using end is less than a first temperature threshold. If not, return to keep the three-way valve in the hot water position; If so, open the gas valve; Detect the water outlet temperature of the hot water using end, and judge whether the water outlet temperature of the hot water using end is less than a second temperature threshold. If not, open the gas valve; If so, close the gas valve, and return to calculate the water shut-off time.

2. The control method for a gas heating furnace according to claim 1, It is characterized in that, The first temperature threshold is greater than the second temperature threshold.

3. The control method for a gas heating furnace according to claim 1, It is characterized in that, When the three-way valve is in the hot water position, control the circulation pump to continuously operate.

4. The control method for a gas heating furnace according to claim 1, It is characterized in that, When controlling the three-way valve to be in the hot water position, control the blower to continuously operate.

5. The control method for a gas heating furnace according to claim 4, It is characterized in that, The rotational speed of the blower is at the ignition rotational speed.

6. The control method for a gas heating furnace according to claim 1, It is characterized in that, When controlling the three-way valve to switch to the heating position, control the operation of the circulation pump and the blower according to the actual heating demand.

7. The control method for a gas heating furnace according to claim 1, It is characterized in that, The start logic of the self-learning water shut-off time program includes the following steps: Detect the water flow rate at the hot water using end, and judge whether the water flow rate at the hot water using end is greater than a first flow rate threshold; If not, do not start the self-learning water shut-off time program; If so, detect the continuous water use time at the hot water using end, and judge whether the continuous water use time at the hot water using end lasts for a first time threshold; If not, do not start the self-learning water shut-off time program; If so, record the current water shut-off time; Determine whether the program for self-learning the water cut-off time is started according to the current water cut-off time.

8. The control method of the gas heating furnace according to claim 7, characterized in that the determination of whether the program for self-learning the water cut-off time is started according to the current water cut-off time includes the following steps: When the current water cut-off time is greater than or equal to the first time threshold and less than or equal to the second time threshold, start the self-learning water cut-off time program; When the current water cut-off time is less than the first time threshold or greater than the second time threshold, do not start the self-learning water cut-off time program.

9. The control method of the gas heating furnace according to claim 7, characterized in that the determination of the self-learning water cut-off time includes the following steps: Start the self-learning water cut-off time program; Record the current water cut-off time; Determine the self-learning water cut-off time t' according to the current water cut-off time.

10. The control method of the gas heating furnace according to claim 9, characterized in that the determination of the self-learning water cut-off time t' according to the current water cut-off time includes: Judge whether the current water cut-off time is greater than the water cut-off time t'' of the existing program. If so, the self-learning water cut-off time t' = t + δt; if not, judge whether the water cut-off time t'' of the existing program continuously maintains the third time threshold t3; When the water cut-off time t'' of the existing program continuously maintains the third time threshold t3, the self-learning water cut-off time t' = t + δt; When the continuous maintenance time of the water cut-off time t'' of the existing program is less than the third time threshold t3, the self-learning water cut-off time t' = t''.

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