Gas water heating device and gas water heating system

Abstract

The utility model relates to the technical field of gas water heating, and particularly discloses a gas water heating device and a gas water heating system, the gas water heating device comprises a water outlet and a water return port which are connected with a circulation loop; the temperature acquisition device is used for acquiring outdoor temperature; the flow detection device can detect the water flow of the gas water heating device; the first temperature detection device is used for detecting the first temperature of water input from the water return port; the operation part is used for operating a user to set the temperature; the fuel gas valve is used for controlling the fuel gas amount during heating of the fuel gas water heating device; a signal output part of the control part is in communication connection with the gas valve, and a signal input part of the control part is in communication connection with the temperature acquisition device, the flow detection device, the first temperature detection device and the operation part. The control part of the gas water heating device can obtain the outdoor temperature and automatically adjust the water outlet temperature according to the outdoor temperature, so that the water temperature of the water using end meets the requirements of users.

Description

Gas-fired hot water units and gas-fired hot water systems Technical Field

[0001] This utility model relates to the field of gas-fired water heating technology, and in particular to a gas-fired water heating device and a gas-fired water heating system. Background Technology

[0002] Gas-fired water heaters are a common type of water heater in people's homes, favored by many users for their instant heating and convenience. During use, users typically set a water temperature, and the gas-fired water heater heats the tap water to that temperature before delivering it to the user through pipes. However, due to heat dissipation through the pipes, the temperature of the hot water delivered to the user decreases, especially if the pipes are long or the outdoor temperature is low. The heat dissipation varies depending on the season and outdoor temperature conditions, and the pipe length also varies from household to household, making it difficult to deliver hot water at the set temperature at the user's end.

[0003] Therefore, it is necessary to propose a gas-fired water heating device and a gas-fired water heating system to solve at least one of the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this specification provides a gas-fired water heater and a gas-fired water heating system that can automatically adjust the outlet water temperature of the gas-fired water heater according to the outdoor temperature, so that the water temperature at the user end meets the user's set water temperature.

[0005] The specific technical solution for the implementation of this specification is as follows:

[0006] A gas-fired hot water device, comprising:

[0007] The water outlet is used to connect to the water supply pipe to output hot water to the user.

[0008] The return water inlet is used to connect to the return water pipe, which can be connected to the outlet water pipe and the gas water heater to form a circulation loop;

[0009] Temperature acquisition device, used to acquire outdoor temperature;

[0010] A flow detection device is provided to detect the water flow rate of the gas-fired water heater.

[0011] A first temperature detection device is used to detect the first temperature of the water input at the return water inlet;

[0012] The control unit is used to allow users to set the temperature.

[0013] A gas valve is used to control the amount of gas used when the gas-fired water heater is heating.

[0014] The control unit has a signal output section that is communicatively connected to the gas valve, and a signal input section that is communicatively connected to the temperature acquisition device, the flow detection device, the first temperature detection device, and the operation unit.

[0015] In one embodiment, the gas-fired water heater further includes: a circulation drive unit capable of driving water to circulate within the circulation loop; the signal output unit of the control unit is communicatively connected to the circulation drive unit; the control unit further includes a time element used to record the time it takes for water to circulate once within the circulation loop after the circulation drive unit is started; the signal input unit of the control unit is communicatively connected to the time element.

[0016] In one embodiment, the control unit stores a first preset correspondence between the outdoor temperature, the water flow rate, the set temperature, and the gas valve opening degree; the control unit outputs an opening degree signal to the gas valve according to the first preset correspondence, the outdoor temperature, the water flow rate, and the set temperature;

[0017] or,

[0018] The control unit stores a second preset correspondence between the outdoor temperature, the water flow rate, the set temperature, the length of the water outlet pipe, and the opening degree of the gas valve; the control unit obtains the length of the water outlet pipe based on the time recorded by the time element, the water flow rate, and the cross-sectional area of ​​the water outlet pipe; the control unit outputs an opening degree signal to the gas valve based on the second preset correspondence, the outdoor temperature, the water flow rate, the set temperature, and the length of the water outlet pipe.

[0019] In one embodiment, the gas-fired water heater further includes: a second temperature detection device for detecting a second temperature of the water output from the outlet of the gas-fired water heater; the signal input unit of the control unit is communicatively connected to the second temperature detection device; the control unit obtains the length of the outlet pipe based on the time recorded by the time element, the water flow rate, the first temperature, the second temperature, and the cross-sectional area of ​​the outlet pipe; the control unit stores a second preset correspondence between the outdoor temperature, the water flow rate, the set temperature, the length of the outlet pipe, and the opening degree of the gas valve; the control unit outputs an opening degree signal to the gas valve based on the second preset correspondence, the outdoor temperature, the water flow rate, the set temperature, and the length of the outlet pipe.

[0020] In one embodiment, the control unit also outputs an opening signal to the gas valve based on the second temperature.

[0021] In one embodiment, the temperature acquisition device includes a wireless network, and the gas water heater acquires at least one of the following information through the wireless network: location, weather, season, outdoor temperature, etc.

[0022] A gas-fired hot water system includes a gas-fired hot water device, wherein the return water inlet can be the inlet of the gas-fired hot water device, and the return water pipe is a tap water pipe between the inlet and the water-using end; or, the return water inlet is separately installed on the gas-fired hot water device, and the return water pipe is connected to the return water inlet and the outlet water pipe near the water-using end.

[0023] In one embodiment, the gas-fired hot water system further includes a circulation drive unit capable of driving the water circulation flow within the circulation loop, and the signal output unit of the control unit is communicatively connected to the circulation drive unit; after the circulation drive unit stops operating, the control unit outputs a restart signal to the circulation drive unit based on the outdoor temperature and / or the first temperature.

[0024] In one embodiment, the return water inlet can be the inlet of the gas-fired water heater, and the return water pipeline is the tap water pipeline between the inlet and the water-using end; the water-using end further includes a hot water inlet and a cold water inlet; the outlet pipeline connects the outlet and the hot water inlet; the return water pipeline connects the inlet and the cold water inlet; the circulation loop further includes a circulation control unit, which is capable of connecting the hot water inlet and the cold water inlet.

[0025] In one embodiment, the gas-fired water heater further includes: a circulation drive unit, which is capable of driving the water to circulate in the circulation loop, and the signal output unit of the control unit is communicatively connected to the circulation drive unit;

[0026] When the water outlet is closed and the circulation drive unit is activated, the circulation control unit opens to connect the hot water outlet and the cold water outlet.

[0027] The technical solution in this specification has the following significant advantages:

[0028] The gas-fired water heater and gas-fired water heating system provided in this application obtain outdoor temperature through a temperature acquisition device. Combined with information from the flow detection device, the first temperature detection device, and the operating unit on the gas-fired water heater, the control unit controls the opening of the gas valve to achieve automatic adjustment of the outlet water temperature. Regardless of the season or the length of the user's pipes, the gas-fired water heater can deliver hot water at the water outlet that is very close to the user's set water temperature on the operating unit, improving the user experience.

[0029] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the scope of the embodiments of the present invention is not limited thereto. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0030] It should be emphasized that the term "comprising / including" as used herein refers to the presence of a feature, part, step, or component, but does not exclude the presence or addition of one or more other features, parts, steps, or components. Attached Figure Description

[0031] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances. In the drawings:

[0032] Figure 1 is a structural schematic diagram of a gas-fired hot water device provided in an embodiment of this application.

[0033] Figure 2 is a schematic diagram of the control components of a gas-fired water heater provided in Figure 1.

[0034] Figure 3 is a schematic diagram of a gas-fired hot water system provided in the embodiments of this application.

[0035] Figure 4 is a schematic diagram of another gas-fired hot water system provided in the embodiments of this application.

[0036] Reference numerals in the figures of this application:

[0037] 1. Gas-fired hot water system;

[0038] 10. Inlet; 11. Outlet; 12. Return outlet;

[0039] 20. Temperature acquisition device;

[0040] 30. Flow detection device;

[0041] 41. First temperature detection device; 42. Second temperature detection device;

[0042] 50. Operations Department;

[0043] 60. Gas valve;

[0044] 70. Control unit; 701. Signal output unit of the control unit; 702. Signal input unit of the control unit; 703. Timing element;

[0045] 80. Cyclic drive unit;

[0046] 100. Gas-fired hot water system;

[0047] 110. Circulation loop; 1101. Water supply pipeline; 1102. Outlet pipeline; 1103. Return pipeline;

[0048] 120. Water inlet; 1201. Hot water inlet; 1202. Cold water inlet;

[0049] 130. Cyclic Control Department. Detailed Implementation

[0050] The principles and spirit of this specification will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement this specification, and are not intended to limit the scope of this specification in any way. Rather, these embodiments are provided to make this disclosure more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0051] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] This application specification provides a gas-fired water heater 1, which automatically adjusts the outlet water temperature of the gas-fired water heater 1 by acquiring outdoor temperature and combining it with information from the gas-fired water heater 1 itself, thereby controlling the opening degree of the gas valve 60.

[0054] Please refer to Figures 1, 2, and 4. An embodiment of this application provides a gas-fired water heater 1, comprising: an outlet 11 for connecting to an outlet pipe 1102 to supply hot water to a water outlet 120; a return outlet 12 for connecting to a return pipe 1103, which can connect to the outlet pipe 1102 and the gas-fired water heater 1 to form a circulation loop 110; a temperature acquisition device 20 for acquiring outdoor temperature; a flow detection device 30 for detecting the water flow rate of the gas-fired water heater 1; a first temperature detection device 41 for detecting the first temperature of the water input to the return outlet 12; an operation unit 50 for allowing the user to set the temperature; a gas valve 60 for controlling the amount of gas used by the gas-fired water heater 1 during heating; and a control unit 70, whose signal output unit 701 is communicatively connected to the gas valve 60, and whose signal input unit 702 is communicatively connected to the temperature acquisition device 20, the flow detection device 30, the first temperature detection device 41, and the operation unit 50.

[0055] The gas-fired water heater 1 provided in this embodiment includes a temperature acquisition device 20, a flow detection device 30, a first temperature detection device 41, and an operation unit 50. The temperature acquisition device 20, the flow detection device 30, the first temperature detection device 41, and the operation unit 50 are connected to the signal input unit 702 of the control unit, which can transmit the outdoor temperature acquired by the temperature acquisition device 20, the water flow rate of the gas-fired water heater 1 detected by the flow detection device 30, the first temperature of the water input to the return water inlet 12 detected by the first temperature detection device 41, and the set temperature set by the user in the operation unit 50 to the control unit 70. The signal output unit 701 of the control unit is communicatively connected to the gas valve 60, and the control unit 70 can output an opening signal to the gas valve 60. The gas-fired water heater 1 also includes an outlet 11 connected to the outlet pipe 1102 and a return water inlet 12 connected to the return water pipe 1103. In the installed state, the return water pipe 1103, the outlet pipe 1102, and the gas-fired water heater 1 can be connected to form a circulation loop 110.

[0056] In one embodiment of this application, the gas-fired water heater 1 further includes a circulation drive unit 80, which is capable of driving the water in the circulation loop 110 to circulate. The signal output unit 701 of the control unit is communicatively connected to the circulation drive unit 80. The control unit 70 also includes a time element 703, which is used to record the time it takes for the water in the circulation loop 110 to circulate once after the circulation drive unit 80 is started. The signal input unit 702 of the control unit is communicatively connected to the time element 703.

[0057] The gas-fired water heater 1 provided in this embodiment of the application drives the water in the circulation loop 110 to circulate through a circulation drive unit 80 (such as a water pump), thereby heating the water in the circulation loop 110. The signal output unit 701 of the control unit is communicatively connected to the circulation drive unit 80, and the control unit 70 can control the start and stop of the circulation drive unit 80. The control unit 70 also includes a time element 703 for timing, such as the time element 703 being able to record the time from when the control unit 70 controls the circulation drive unit 80 to start until the first temperature detected by the first temperature detection device 41 shows a significant increase. This time is the time it takes for the water in the circulation loop 110 to circulate once along the circulation loop 110 after the circulation drive unit 80 is started.

[0058] In one embodiment of this application, the control unit 70 stores a first preset correspondence between outdoor temperature, water flow rate, set temperature, and gas valve opening. The control unit 70 of the gas water heater 1 outputs an opening signal to the gas valve 60 based on the first preset correspondence, outdoor temperature, water flow rate, and set temperature. Alternatively, the control unit 70 stores a second preset correspondence between outdoor temperature, water flow rate, set temperature, length of the outlet pipe, and gas valve opening. The control unit 70 obtains the length of the outlet pipe 1102 based on the time recorded by the time element 703, water flow rate, and cross-sectional area of ​​the outlet pipe 1102. The control unit 70 outputs an opening signal to the gas valve 60 based on the second preset correspondence, outdoor temperature, water flow rate, set temperature, and length of the outlet pipe 1102.

[0059] In the usage of the gas-fired water heater 1 provided in this embodiment, the user sets the desired temperature (e.g., 40 degrees Celsius) on the operation unit 50. The gas-fired water heater 1 heats the incoming tap water to the set temperature and outputs it to the water outlet 120 through the outlet pipe 1102. Due to heat dissipation from the pipe, the temperature of the hot water output to the water outlet 120 will decrease. To ensure that the user receives hot water at the set temperature at the water outlet 120, the opening of the gas valve 60 needs to be increased not only to heat the incoming tap water to the set temperature but also to ensure that the hot water output by the gas-fired water heater 1 reaches the set temperature after passing through the outlet pipe 1102 to the water outlet 120. The control unit 70 outputs an opening signal to the gas valve 60 based on the outdoor temperature, water flow rate, set temperature, and the length of the user's outlet pipe 1102. The output opening signal can be an increased opening signal or a total opening signal including the increased opening signal. The length of the user's outlet pipe 1102 can be obtained directly through estimation or automatically by the gas-fired water heater 1. The control unit 70 can automatically determine the length of the outlet pipe 1102 based on the time it takes for the water in the circulation loop 110 to circulate once after the circulation drive unit 80 starts, the water flow rate, and the cross-sectional area of ​​the outlet pipe 1102, obtained from the time element 703. Then, based on the outdoor temperature, water flow rate, set temperature, and the length of the outlet pipe 1102 in the user's home, it outputs an opening signal to the gas valve 60. In this way, regardless of the season or the length of the outlet pipe 1102 in the user's home, the control unit 70 can automatically adjust the opening of the gas valve 60, allowing the user to use hot water at the set temperature at the water outlet 120 without the need for manual adjustment by the user, thus improving the user experience.

[0060] In one embodiment of this application, the gas water heater 1 further includes a second temperature detection device 42 for detecting the second temperature of the water output from the outlet 11 of the gas water heater 1. The signal input unit 702 of the control unit is communicatively connected to the second temperature detection device 42. The control unit 70 obtains the length of the outlet pipe 1102 based on the time, water flow rate, first temperature, second temperature, and cross-sectional area of ​​the outlet pipe 1102 recorded by the time element 703. The control unit 70 stores a second preset correspondence between outdoor temperature, water flow rate, set temperature, length of the outlet pipe, and gas valve opening. The control unit 70 outputs an opening signal to the gas valve 60 based on the second preset correspondence, outdoor temperature, water flow rate, set temperature, and length of the outlet pipe 1102.

[0061] The gas-fired water heater 1 provided in this embodiment includes a second temperature detection device 42 for detecting the second temperature of the water output from the outlet 11. The control unit 70 automatically obtains the length of the outlet pipe 1102 (another embodiment for automatically obtaining the length of the outlet pipe 1102) based on the time it takes for the water in the circulation loop 110 to circulate once after the circulation drive unit 80 is started, the water flow rate, the first temperature, the second temperature, and the cross-sectional area of ​​the outlet pipe 1102 (based on the time it takes for the water in the circulation loop 110 to circulate once after the circulation drive unit 80 is started). Then, it outputs an opening signal to the gas valve 60 based on the outdoor temperature, water flow rate, set temperature, and the length of the outlet pipe 1102 in the user's home.

[0062] In one embodiment of this application, the control unit 70 also outputs an opening signal to the gas valve 60 based on the second temperature, that is, the control unit 70 further and accurately adjusts the opening of the gas valve 60 based on the feedback of the second temperature of the water output from the outlet 11.

[0063] In one embodiment of this application, the temperature acquisition device 20 of the gas water heater 1 includes a wireless network, through which the gas water heater 1 acquires at least one of the following information: location, weather, season, outdoor temperature, etc. Specifically, the gas water heater 1 includes a wireless network communication module (such as a WiFi module), and the control unit 70 can acquire information such as location, weather, season, and outdoor temperature through the wireless network communication module. The control unit 70 can directly acquire outdoor temperature information, and then output an opening signal to the gas valve 60 based on the outdoor temperature, water flow rate, set temperature, and the length of the user's water outlet pipe 1102; the control unit 70 can also further limit the opening of the gas valve 60 based on location, weather, season, etc., such as keeping the opening of the gas valve 60 within a preset range for different seasons, to avoid excessive adjustment of the gas valve 60 opening due to sudden changes in outdoor temperature.

[0064] This application specification also provides a gas-fired water heating system 100, including a gas-fired water heating device 1, an outlet pipe 1102, and a return pipe 1103 forming a circulation loop 110. The gas-fired water heating system 100 can heat the water from the gas-fired water heating device 1 to the water outlet 120 or the water outlet 1102 near the water outlet 120, so that hot water can flow out when the user opens the water outlet 120, further improving the user experience.

[0065] Please refer to Figure 3. An embodiment of this application specification provides a gas-fired water heating system 100, including a gas-fired water heating device 1. The return water inlet 12 can be the inlet 10 of the gas-fired water heating device 1, and the return water pipe 1103 is the tap water pipe 1101 between the inlet 10 and the water outlet 120; or, please refer to Figure 4, the return water inlet 12 is separately installed on the gas-fired water heating device 1, and the return water pipe 1103 connects the return water inlet 12 and the outlet water pipe 1102 near the water outlet 120.

[0066] The gas-fired water heating system 100 in this application embodiment can be implemented in two ways. One way is to form a circulation loop 110 by gas-fired water heating device 1, water outlet pipe 1102 and part of tap water pipe 1101 (tap water pipe 1101 between water inlet 10 of gas-fired water heating device 1 and water outlet 120, see Figure 3); the other way is to form a circulation loop 110 by gas-fired water heating device 1, water outlet pipe 1102 and separately provided return water pipe 1103 (return water pipe 1103 provided between return water inlet 12 of gas-fired water heating device 1 and a location near water outlet 120, see Figure 4).

[0067] In one embodiment of this application, the gas-fired hot water system 100 further includes a circulation drive unit 80, which can drive the water circulation flow in the circulation loop 110. The signal output unit 701 of the control unit is communicatively connected to the circulation drive unit 80. After the circulation drive unit 80 stops running, the control unit 70 outputs a restart signal to the circulation drive unit 80 according to the outdoor temperature and / or a first temperature.

[0068] The gas-fired hot water system 100 provided in this embodiment of the application also includes a circulation drive unit 80 (such as a water pump) to drive the water circulation flow in the circulation loop 110. The control unit 70 can control the start and stop of the circulation drive unit 80. In the circulation state, when the first temperature of the water input to the return port 12 detected by the first temperature detection device 41 reaches the first preset temperature, the control unit 70 controls the circulation drive unit 80 to stop running. Due to heat dissipation from the pipeline, the water in the circulation loop 110 slowly cools down. The control unit 70 outputs a signal to the circulation drive unit 80 to restart according to the outdoor temperature and the range of the first temperature drop. If the outdoor temperature is low, the range of the first temperature drop is small (e.g., the circulation drive unit 80 restarts after a drop of 3 degrees Celsius); if the outdoor temperature is high, the range of the first temperature drop is slightly higher (e.g., the circulation drive unit 80 restarts after a drop of 5 degrees Celsius). In a gas-fired water heating system 100, the gas-fired water heating device 1, the outlet pipe 1102, and part of the tap water pipe 1101 constitute a circulation loop 110. The return port 12 of the gas-fired water heating device 1 is also the inlet port 10 of the gas-fired water heating device 1. When the gas-fired water heating device 1 outputs hot water to the water-using end 120, the first temperature detected by the first temperature detection device 41 is the temperature of the tap water entering from the inlet port 10. Based on the temperature of the tap water, the outdoor temperature can also be roughly judged. Therefore, the control unit 70 can also output a restart signal to the circulation drive unit 80 based on the temperature of the tap water detected by the first temperature detection device 41.

[0069] In one embodiment of this application, referring to Figure 3, the return water inlet 12 of the gas-fired water heating system 100 can be the inlet 10 of the gas-fired water heating device 1, and the return water pipe 1103 is the tap water pipe 1101 between the inlet 10 and the water outlet 120; the water outlet 120 also includes a hot water outlet 1201 and a cold water outlet 1202; the outlet pipe 1102 connects the outlet 11 and the hot water outlet 1201; the return water pipe 1103 (i.e., the tap water pipe 1101) connects the inlet 10 and the cold water outlet 1202; the circulation loop 110 also includes a circulation control unit 130, which can connect the hot water outlet 1201 and the cold water outlet 1202. When the water outlet 120 is closed and the circulation drive unit 80 is activated, the circulation control unit 130 opens to connect the hot water outlet 1201 and the cold water outlet 1202.

[0070] The gas-fired water heating system 100 provided in this embodiment includes a gas-fired water heating device 1, a water outlet pipe 1102, and a portion of a tap water pipe 1101 forming a circulation loop 110. The water outlet pipe 1102 and the portion of the tap water pipe 1101 are respectively connected to the hot water outlet 1201 and the cold water outlet 1202 of the water-using end 120. The circulation control unit 130 is also connected between the hot water outlet 1201 and the cold water outlet 1202 of the water-using end 120. In the circulation state, when the water-using end 120 is closed, the circulation drive unit 80 is started, and the circulation control unit 130 can be opened to connect the hot water outlet 1201 and the cold water outlet 1202, so that the gas-fired water heating device 1, the water outlet pipe 1102, and the portion of the tap water pipe 1101 form a circulation loop 110 that is connected.

[0071] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this specification should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents.

[0072] The above are merely preferred embodiments of this specification and are not intended to limit this specification. Various modifications and variations can be made to the embodiments described herein by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A gas-fired hot water device, characterized in that, include: The water outlet is used to connect to the water supply pipe to output hot water to the user. A return water inlet is used to connect to a return water pipe, which can be connected to the outlet water pipe and the gas water heater to form a circulation loop; a temperature acquisition device is used to acquire the outdoor temperature; A flow detection device is used to detect the water flow rate of the gas-fired water heater; a first temperature detection device is used to detect the first temperature of the water input at the return port. The operation unit is used to allow the user to set the temperature; the gas valve is used to control the amount of gas used when the gas water heater is heating; the control unit has a signal output section that is communicatively connected to the gas valve, and a signal input section that is communicatively connected to the temperature acquisition device, the flow detection device, the first temperature detection device, and the operation unit.

2. The gas-fired hot water device according to claim 1, characterized in that, Also includes: The circulation drive unit is capable of driving the water to circulate within the circulation loop. The signal output unit of the control unit is communicatively connected to the circulation drive unit. The control unit also includes a time element, which is used to record the time it takes for the water in the circulation loop to circulate once after the circulation drive unit is started. The signal input unit of the control unit is communicatively connected to the time element.

3. The gas-fired hot water device according to claim 2, characterized in that: The control unit stores a first preset correspondence between the outdoor temperature, the water flow rate, the set temperature, and the gas valve opening degree; the control unit outputs an opening degree signal to the gas valve according to the first preset correspondence, the outdoor temperature, the water flow rate, and the set temperature; or, the control unit stores a second preset correspondence between the outdoor temperature, the water flow rate, the set temperature, the length of the water outlet pipe, and the gas valve opening degree; the control unit obtains the length of the water outlet pipe based on the time recorded by the time element, the water flow rate, and the cross-sectional area of ​​the water outlet pipe, and the control unit outputs an opening degree signal to the gas valve according to the second preset correspondence, the outdoor temperature, the water flow rate, the set temperature, and the length of the water outlet pipe.

4. The gas-fired hot water device according to claim 2, characterized in that, Also includes: The second temperature detection device is used to detect the second temperature of the water output from the outlet of the gas water heater. The signal input unit of the control unit is communicatively connected to the second temperature detection device. The control unit obtains the length of the outlet pipe based on the time recorded by the time element, the water flow rate, the first temperature, the second temperature, and the cross-sectional area of ​​the outlet pipe. The control unit stores a second preset correspondence between the outdoor temperature, the water flow rate, the set temperature, the length of the outlet pipe, and the opening degree of the gas valve. The control unit outputs an opening degree signal to the gas valve based on the second preset correspondence, the outdoor temperature, the water flow rate, the set temperature, and the length of the outlet pipe.

5. The gas-fired hot water device according to claim 4, characterized in that, The control unit also outputs an opening signal to the gas valve based on the second temperature.

6. The gas-fired hot water device according to claim 1, characterized in that: The temperature acquisition device includes a wireless network, and the gas water heater acquires at least one of the following information through the wireless network: location, weather, season, outdoor temperature, etc.

7. A gas-fired hot water system, comprising the gas-fired hot water device as described in any one of claims 1 to 6, characterized in that: The return water inlet can be the inlet of the gas-fired water heater, and the return water pipe is the tap water pipe between the inlet and the water-using end; or, the return water inlet can be separately installed on the gas-fired water heater, and the return water pipe can be connected to the return water inlet and the outlet pipe near the water-using end.

8. The gas-fired hot water system according to claim 7, characterized in that, Also includes: A circulation drive unit is provided, which is capable of driving the water to circulate within the circulation loop. The signal output unit of the control unit is communicatively connected to the circulation drive unit. After the circulation drive unit stops operating, the control unit outputs a restart signal to the circulation drive unit based on the outdoor temperature and / or the first temperature.

9. The gas-fired hot water system according to claim 7, characterized in that: The return water inlet can be the inlet of the gas-fired water heater, and the return water pipe is the tap water pipe between the inlet and the water-using end; the water-using end also includes a hot water inlet and a cold water inlet; the outlet pipe connects the outlet and the hot water inlet; the return water pipe connects the inlet and the cold water inlet; the circulation loop also includes a circulation control unit, which can connect the hot water inlet and the cold water inlet.

10. The gas-fired hot water system according to claim 9, characterized in that: The gas-fired water heater further includes: a circulation drive unit, which is capable of driving the water to circulate in the circulation loop; the signal output unit of the control unit is communicatively connected to the circulation drive unit; when the water outlet is closed and the circulation drive unit is activated, the circulation control unit opens to connect the hot water outlet and the cold water outlet.

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