CN205860500U - Gas heater - Google Patents

Abstract

The utility model discloses a kind of gas heater, including heat-exchange system, inflow temperature detection device, outlet water temperature detecting device, feed water flow amount detecting device, combustion system, pneumatic control system and control system, described combustion system has the many groups fire row that can individually burn；Described pneumatic control system connects with described combustion system；Described control system detects device, described outlet water temperature detecting device, described feed water flow amount detecting device, described combustion system and described pneumatic control system communication with described inflow temperature respectively, and described control system controls described pneumatic control system and the start and stop of described combustion system according to detected value, the detected value of described outlet water temperature detecting device and the target temperature of described feed water flow amount detecting device and detects detected value and the fire row burning group number of the threshold temperature described combustion system of control of device according to described inflow temperature.According to gas heater of the present utility model, there is good adaptability and comfortableness, and it is simple to control logic.

Description

gas water heater

technical field

The utility model relates to the technical field of water heaters, in particular to a gas water heater.

Background technique

For water heaters in related technologies, especially gas water heaters with zero-cooling technology (that is, circulation preheating function), when the resistance of the water pipeline in the user's home is large or the inlet water temperature is higher than 30°C, the adaptability of the zero-cooling technology will be reduced. Reduced, affecting the user experience. In addition, existing water heaters need to rely on a special program to meet the continuous cycle preheating function, and the program is relatively complicated.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, the utility model proposes a gas water heater, which has good adaptability and comfort and simple control logic.

The gas water heater according to the embodiment of the present invention includes: a heat exchange system; an inlet water temperature detection device for detecting the inlet water temperature of the heat exchange system and an outlet water temperature detection device for detecting the outlet water temperature of the heat exchange system device; an inlet water flow detection device for detecting the inlet water flow of the heat exchange system; a combustion system for heating the heat exchange system, and the combustion system has multiple groups of fire rows that can be burned separately; For the air control system that delivers gas to the combustion system, the air control system communicates with the combustion system; the control system, the control system is connected with the inlet water temperature detection device, the outlet water temperature detection device, the The inlet water flow detection device, the combustion system communicate with the air control system, and the control system controls the Start and stop of the air control system and the combustion system, and control the number of fire row combustion groups of the combustion system according to the detection value and the threshold temperature of the inlet water temperature detection device.

The gas water heater according to the embodiment of the utility model has ultra-low load working capability, good adaptability and comfort, high user experience, and can realize continuous cycle preheating without complex control program, and the control logic is simple.

In addition, the gas water heater according to the embodiment of the utility model also has the following additional technical features:

According to some embodiments of the present invention, the combustion system includes: a burner on which multiple sets of the fire row are formed, and the burner is configured to communicate with the air control system and the multiple sets of fire bars respectively. A plurality of intake passages of the fire row; at least one intake control valve, the intake control valve is respectively arranged on the intake passage and controls the on-off of the intake passage; for igniting the fire row the ignition device, the control system communicates with the ignition device and each of the intake control valves respectively.

Further, one of the multiple groups of fire rows only includes one fire row, and the intake control valves are respectively arranged on the fire rows of the multiple groups of the fire rows except the one fire row. on the intake channel.

In some embodiments of the present utility model, the plurality of groups of fire rows include a first group of fire rows, a second group of fire rows and a third group of fire rows that only contain one fire row, and a plurality of said air intake passages include The first air intake passage communicated with the first group of fire rows, the second air intake passage communicated with the second group of fire rows and the third air intake passage communicated with the third group of fire rows, the inlet There are two air control valves, including a first air intake control valve arranged on the second air intake passage and a second air intake control valve arranged on the third air intake passage.

Optionally, the combustion system further includes a plurality of combustion feedback needles, and the plurality of combustion feedback needles are respectively arranged at the ignition device and between adjacent groups of fire rows and communicate with the control system.

Advantageously, the intake control valve is a solenoid valve.

According to some embodiments of the present utility model, the gas water heater includes: a water inlet pipeline, the water inlet pipeline is connected to the heat exchange system, and the inlet water temperature detection device and the inlet water flow detection device are arranged at the The water inlet pipeline; the water outlet pipeline, the water outlet pipeline is connected to the heat exchange system and the outlet water temperature detection device is set on the water outlet pipeline.

Further, the gas water heater also includes a circulating water pump, which is arranged on the water inlet pipeline and communicates with the control system.

According to some embodiments of the present utility model, the gas water heater further includes a smoke exhaust system for exhausting the smoke generated by the combustion system, and the smoke exhaust system communicates with the control system.

Further, the smoke exhaust system includes: a casing, the casing has a combustion chamber, and the heat exchange system and the combustion system are arranged in the combustion chamber; a smoke collection hood, and the smoke collection hood is arranged in the combustion chamber The top of the casing has a smoke exhaust port communicating with the combustion chamber; the fan is arranged under the casing and communicates with the combustion chamber, and the fan communicates with the control system.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

Fig. 1 is a schematic structural view of a gas water heater according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a combustion system of a gas water heater according to an embodiment of the present invention.

Reference signs:

gas water heater 1,

heat exchange system 100,

An inlet water temperature detection device 210, an outlet water temperature detection device 220, an inlet water flow detection device 230,

Combustion system 300, the first group of fire row 301, the second group of fire row 302, the third group of fire row 303, the first intake channel 304, the second intake channel 305, the third intake channel 306, the first intake channel Control valve 307, second intake control valve 308, burner 310, fire row 311, intake passage 312, intake control valve 320, ignition device 330, combustion feedback needle 340,

Air control system 400, control system 500, water inlet pipeline 600, water outlet pipeline 700, circulating water pump 800,

Housing 910 , combustion chamber 911 , smoke collecting hood 920 , smoke outlet 921 , fan 930 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In describing the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" etc. indicate directions or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , so it cannot be interpreted as a limitation of the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

This application is based on the inventor's discovery and recognition of the following facts and problems:

The water heaters in the related art, especially the gas water heaters with circulation preheating function, can preheat the water in the pipeline in advance, so that the user can use it directly without waiting, and does not need to drain the cold water. However, in the actual use process, when the resistance of the circulating water pipe in some users' homes is very large (for example, the pipeline is aging or blocked), or the inlet water temperature exceeds 30°C (for example, the inlet water temperature is high in summer), the zero The cold water function performs circulating preheating. At this time, due to the large resistance of the water pipe, the small water flow, or the high temperature of the incoming water, the water temperature after preheating exceeds the target temperature, which affects the user's water experience.

In addition, for a gas water heater with a continuous cycle preheating function, since the water temperature in the water pipe will slowly drop below the target temperature over time after a preheating cycle is completed, after the continuous cycle preheating function is turned on, The water heater will start the cycle preheating function again when the water temperature drops to the preset temperature (for example, lower than 35°C), but if the environmental conditions at this time are consistent with the previous situation, the preheated water temperature will also be higher than the target temperature. The normal use of the continuous cycle preheating function can only be guaranteed through complex logic control.

Therefore, the utility model proposes a gas water heater 1, which has good adaptability and comfort and simple control logic.

A gas water heater 1 according to an embodiment of the present utility model is described below with reference to FIG. 1 and FIG. 2 .

As shown in Figures 1 and 2, a gas water heater 1 according to an embodiment of the present invention includes a heat exchange system 100, an inlet water temperature detection device 210, an outlet water temperature detection device 220, an inlet water flow detection device 230, a combustion system 300, Air control system 400 and control system 500.

Specifically, the heat exchange system 100 may be a heat exchanger. The inlet water temperature detecting device 210 is used for detecting the inlet water temperature of the heat exchange system 100 , the outlet water temperature detecting device 220 is used for detecting the outlet water temperature of the heat exchange system 100 , and the inlet water flow detecting device 230 is used for detecting the inlet water temperature of the heat exchange system 100 flow. The combustion system 300 has multiple groups of fire rows 311 that can be combusted individually to heat the heat exchange system 100 . Here, multiple groups of fire rows 311 can burn separately, which means that the combustion conditions of multiple groups of fire rows 311 do not affect each other, that is, only one group of fire rows 311 can burn, and multiple groups of fire rows 311 can also burn simultaneously. The gas control system 400 communicates with the combustion system 300 to deliver gas to the combustion system 300 .

The control system 500 communicates with the inlet water temperature detection device 210, the outlet water temperature detection device 220, the inlet water flow detection device 230, the combustion system 300 and the air control system 400 respectively. The detection value of the detection device 220 and the target temperature control the start and stop of the air control system 400 and the combustion system 300, and the control system 500 controls the number of combustion groups of the fire row 311 of the combustion system 300 according to the detection value of the inlet water temperature detection device 210 and the threshold temperature . Wherein, the control system 500 may be a controller.

The following describes the working process of the gas water heater 1 according to the embodiment of the present utility model with reference to the accompanying drawings.

Start the cycle preheating function, the preset threshold temperature is 30°C, the target temperature is 40°C, the water flow detection device 230 detects the water flow signal and provides the water flow signal to the control system 500, and the control system 500 reads the water flow temperature detection device The detection value of 210. When the detection value of the inlet water temperature detection device 210 is lower than the threshold temperature (for example, the inlet water temperature is 15°C), the control system 500 starts the air control system 400 and the combustion system 300, and the control system 500 controls multiple groups of fire row 311 to burn , when the detection value of the outlet water temperature detection device 220 reaches the target temperature, the air control system 400 and the combustion system 300 stop running, thus realizing cycle preheating.

It can be understood that in the above cycle preheating process, the return water temperature is the inlet water temperature, and when the detection value of the inlet water temperature detection device 210 reaches the threshold temperature, the control system 500 controls a group of fire row 311 to burn and controls the rest of the fire row 311 is closed, that is, when the actual demand heat load is small, the control system 500 controls the gas water heater 1 to be in an ultra-low load combustion state, so as to avoid excessively high water temperature after preheating.

It can also be understood that when the detection value of the inlet water temperature detection device 210 reaches the threshold temperature of 30°C at the beginning of preheating, the control system 500 can directly control the gas water heater 1 to operate in an ultra-low-load combustion state, thereby improving user experience . In addition, when the detection value of the water inlet flow detection device 230 is lower than the preset water flow, the control system 500 can still directly control the gas water heater 1 to operate in an ultra-low load combustion state, for example, the load section of a single fire row 311 is 0.8 kW～2kW, calculated according to the large resistance of the circulating water pipe and the circulating water flow rate of 3L, the gas water heater 1 according to the embodiment of the utility model can heat the 3L of water by 3°C～8°C.

It should be noted that the control system 500 can control the gas supply of the air control system 400 according to the difference between the detected value of the outlet water temperature detection device 220 and the target temperature, for example, adjust the gas pressure to adjust the firepower of the combustion system 300, Moreover, the control system 500 can also control the opening and closing of multiple groups of fire rows 311 according to the actual heat load. When the heat load actually required is relatively large, it is possible to control some groups of multiple fire rows 311 to burn and the rest to be turned off, or to control all the fire rows 311 to burn together.

Start the continuous cycle preheating function, that is, after the above cycle preheating process is completed once, when the water temperature in the circulating water pipe drops below the target temperature and is higher than the threshold temperature, for example, the target temperature is 40°C, when the water inlet temperature detection device When the detection value of 210 is 35°C, the gas water heater 1 starts the cycle preheating function again. At this time, the gas water heater 1 is working in an ultra-low load state, and only a single fire row 311 is turned on to heat the water. The heat load is in the related art. 1/5 of the minimum heat load of the water heater. For example, the heat load range of the 16L gas water heater in the related art is 3.8kW～32kW, but the ultra-low heat load of the gas water heater 1 according to the embodiment of the present utility model is only 0.8kW～2kW, therefore, the gas water heater 1 of the present utility model It can be well applied to special environmental conditions, especially the situation where the inlet water temperature is high, the resistance of the circulation pipeline is large, and the circulation water flow rate is low.

In summary, the gas water heater 1 according to the embodiment of the present utility model has ultra-low load working capacity, good adaptability and comfort, high user experience, and can realize continuous cycle preheating without complex control procedures. The control logic is simple.

According to some embodiments of the present invention, as shown in FIGS. 1 and 2 , the combustion system 300 may include a burner 310 , at least one intake control valve 320 and an ignition device 330 . Multiple groups of fire rows 311 are formed on the burner 310, and the burner 310 is configured with a plurality of intake passages 312 respectively communicating with the air control system 400 and multiple groups of fire rows 311, and the gas of the air control system 400 is supplied through the intake passages 312. Arrange 311 toward the corresponding fire. The intake control valves 320 are respectively arranged on the intake passages 312 , and the intake control valves 320 control the opening and closing of the intake passages 312 . Advantageously, the intake control valve 320 can be a solenoid valve, so that the electric control is fast and the reliability is high. The ignition device 330 is used to ignite the fire row 311 , and the control system 500 communicates with the ignition device 330 and each intake control valve 320 respectively.

Therefore, when the gas water heater 1 is working, the ignition device 330 ignites, the air control valve of the air control system 400 opens, and the control system 500 controls the corresponding air intake control valve 320 according to the detection value of the inlet water temperature detection device 210 and the threshold temperature, so as to Control the opening and closing of the corresponding intake passage 312 . For example, when the detection value of the inlet water temperature detection device 210 is lower than the threshold temperature, the control system 500 controls the air intake control valve 320 to fully open; when the detection value of the inlet water temperature detection device 210 reaches the threshold temperature, the control system 500 controls The air intake control valve 320 is all closed, and now only one group of fire row 311 is burning.

Further, as shown in FIGS. 1 and 2 , one group of multiple groups of fire rows 311 only includes one fire row 311 , and the intake control valve 320 is respectively arranged in the group of multiple groups of fire rows 311 except the one fire row 311 . On the intake passage 312 that the remaining fire rows 311 outside the row 311 communicate. In other words, one group of the multiple groups of fire rows 311 only includes one fire row 311, and the one fire row 311 is directly connected to the air control system 400, and the remaining groups of the plurality of groups of fire rows 311 respectively include multiple fire rows 311, and The rest of the multiple groups of fire rows 311 communicate with the air control system 400 through the intake control valve 320 respectively. In this way, it is only necessary to close all the intake control valves 320 to make the gas water heater 1 work in an ultra-low load state, and only the one fire row 311 is burning at this time.

In the embodiment shown in Fig. 1 and Fig. 2, multiple groups of fire rows 311 include a first group of fire rows 301, a second group of fire rows 302 and a third group of fire rows 303 which only contain one fire row 311, the second group The fire rows 302 and the third group of fire rows 303 respectively include a plurality of fire rows 311 , for example, the second group of fire rows 302 includes four fire rows 311 , and the third group of fire rows 303 includes eleven fire rows 311 . A plurality of intake passages 312 include a first intake passage 304, a second intake passage 305 and a third intake passage 306, the first intake passage 304 communicates with the first group of fire row 301, the second intake passage 305 communicates with The second group of fire rows 302 communicates, and the third air intake channel 306 communicates with the third group of fire rows 303 . The intake control valve 320 is two and includes a first intake control valve 307 and a second intake control valve 308. The first intake control valve 307 is arranged on the second intake passage 305, and the second intake control valve 308 It is provided on the third air intake passage 306 .

As a result, the first air intake control valve 307 and the second air intake control valve 308 are closed, so that the air control system 400 communicates with the first group of fire row 301 only through the first air intake passage 304, thereby realizing the ultra-low temperature of the gas water heater 1. load function. When the heat load of the actual demand is large, one of the first intake control valve 307 and the second intake control valve 308 can be opened according to the actual situation, or the first intake control valve 307 and the second intake control valve 308 all open.

Optionally, as shown in FIG. 1, the combustion system 300 may also include a plurality of combustion feedback needles 340, and the plurality of combustion feedback needles 340 are respectively arranged at the ignition device 330 and between adjacent groups of fire rows 311, and the plurality of combustion feedback needles 340 The feedback pins 340 communicate with the control system 500 respectively. For example, there are two combustion feedback needles 340 , one combustion feedback needle 340 is set at the ignition device 330 , and the other combustion feedback needle 340 is set between the second group of fire rows 302 and the third group of fire rows 303 . In this way, it is possible to detect whether the flame burns normally.

According to some embodiments of the present utility model, as shown in FIG. 1 , the gas water heater 1 may include a water inlet pipeline 600 and a water outlet pipeline 700 . The water inlet pipeline 600 is connected with the heat exchange system 100 , and the inlet water temperature detecting device 210 and the inlet water flow detecting device 230 are arranged on the water inlet pipeline 600 . The water outlet pipeline 700 is connected to the heat exchange system 100 , and the outlet water temperature detection device 220 is arranged on the water outlet pipeline 700 . Further, the gas water heater 1 may also include a circulating water pump 800, which is arranged on the water inlet pipeline 600 and communicates with the control system 500. When the gas water heater 1 starts the circulating preheating function, the control system 500 controls the circulating water pump 800 to start, thereby Realize water inflow and backwater.

According to some embodiments of the present utility model, as shown in FIG. 1 , the gas water heater 1 may further include a smoke exhaust system for exhausting smoke generated by the combustion system 300 , and the smoke exhaust system communicates with the control system 500 . In this way, before the ignition device 330 ignites, the control system 500 controls the smoke exhaust system to perform pre-cleaning to exhaust exhaust gas to prevent deflagration.

Further, as shown in FIG. 1 , the smoke exhaust system may include a casing 910 , a smoke collection hood 920 and a fan 930 . The casing 910 has a combustion chamber 911 , and the heat exchange system 100 and the combustion system 300 are arranged in the combustion chamber 911 . The smoke collecting hood 920 is arranged on the top of the housing 910 , and the smoke collecting hood 920 has a smoke exhaust port 921 communicating with the combustion chamber 911 . The blower 930 is arranged under the casing 910, and the blower 930 communicates with the combustion chamber 911, and the blower 930 communicates with the control system 500. In this way, the control system 500 starts the blower 930 according to a predetermined program to perform pre-cleaning during smoke exhaust, so as to rapidly burn the combustion chamber. The smoke in the chamber 911 is exhausted.

The gas water heater 1 according to a specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the following description is only an illustration and should not be construed as a limitation of the present invention.

As shown in Figures 1 and 2, a gas water heater 1 according to an embodiment of the present invention includes a heat exchange system 100, an inlet water temperature detection device 210, an outlet water temperature detection device 220, an inlet water flow detection device 230, a combustion system 300, Air control system 400, control system 500, water inlet pipeline 600, water outlet pipeline 700, circulating water pump 800 and smoke exhaust system.

Specifically, the heat exchange system 100 is a heat exchanger, the inlet water temperature detection device 210 and the outlet water temperature detection device 220 are respectively temperature sensors, and the inlet water flow detection device 230 is a water flow sensor. The water inlet pipeline 600 and the water outlet pipeline 700 are respectively connected with the heat exchange system 100, the inlet water temperature detection device 210, the inlet water flow detection device 230 and the circulating water pump 800 are arranged on the water inlet pipeline 600, and the outlet water temperature detection device 220 is arranged on the outlet Water pipeline 700 on.

The combustion system 300 includes a burner 310 , two intake control valves 320 , an ignition device 330 and two combustion feedback needles 340 . A first group of fire rows 301, a second group of fire rows 302 and a third group of fire rows 303 are formed in sequence from right to left on the burner 310. The first group of fire rows 301 only includes one fire row 311, and the second group of fire rows 302 includes four fire rows 311 , and the third group of fire rows 303 includes eleven fire rows 311 . Three intake passages 312 are also configured on the burner 310, and the three intake passages 312 are respectively the first intake passage 304, the second intake passage 305 and the third intake passage 306, and the first intake passage 304 is connected with the third intake passage respectively. The air control system 400 communicates with the first group of fire row 301, the second air intake passage 305 communicates with the air control system 400 and the second group of fire row 302 respectively, and the third air intake passage 306 communicates with the air control system 400 and the second group of fire row 302 respectively. Three groups of fire rows 303 are connected.

The two intake control valves 320 are electromagnetic valves and are respectively the first intake control valve 307 and the second intake control valve 308. The first intake control valve 307 is arranged on the second intake passage 305, and the second intake control valve An air control valve 308 is provided on the third intake passage 306 . The ignition device 330 is an ignition pin located at the first group of fire rows 301, one of the two combustion feedback needles 340 is located at the ignition device 330, and the other is located at the second group of fire rows 302 and the third group of fire rows. Between 303.

The smoke exhaust system includes a housing 910 , a smoke collection hood 920 and a fan 930 . The casing 910 has a combustion chamber 911 , and the heat exchange system 100 and the combustion system 300 are arranged in the combustion chamber 911 . The smoke collecting hood 920 is arranged on the top of the casing 910 , and the smoke collecting hood 920 has a smoke exhaust port 921 communicating with the combustion chamber 911 . The blower 930 is disposed under the casing 910 , and the blower 930 communicates with the combustion chamber 911 .

The control system 500 is a controller. The control system 500 is connected with the inlet water temperature detection device 210, the outlet water temperature detection device 220, the inlet water flow detection device 230, the ignition device 330, the first air intake control valve 307, the second air intake control valve 308, and two combustion feedback needles. 340, the air control valve of the air control system 400, the circulating water pump 800 and the fan 930 communicate.

The working process of the gas water heater 1 according to the embodiment of the present utility model under three working conditions will be described below with reference to the accompanying drawings.

1. Turn on the machine to start the cycle preheating function.

Taking the incoming water temperature as 15°C, the threshold temperature as 30°C and the target temperature as 40°C as an example, the control system 500 controls the circulating water pump 800 to start, the incoming water flow detection device 230 detects the water flow signal, and provides the water flow signal to the control system 500 , the control system 500 reads the temperature data of the inlet water temperature detection device 210 as the normal inlet water temperature (that is, the inlet water temperature is less than 30° C.), the control system 500 starts the fan 930 according to the established procedure for pre-cleaning, and then the ignition device 330 ignites , the air control system 400 opens the air control valve, the first air intake control valve 307 and the second air intake control valve 308 are opened respectively, and the gas enters the first group of fire row 301 through the first air intake passage 304 and the gas enters through the second air intake channel 304 The channel 305 enters the second group of fire row 302, and enters the third group of fire row 303 through the third intake channel 306. The two combustion feedback pins 340 detect that the flame is normal combustion. At this time, the flame heats the water and gas in the heat exchange system 100. The water heater 1 enters the cycle preheating state.

In the above process, according to the difference between the detection value of the outlet water temperature detection device 220 and the target temperature, the control system 500 outputs a signal to the air control system 400 to adjust the firepower, and at the same time, the control system 500 turns on or off the first heat load according to the actual demand. An intake control valve 307 or a second intake control valve 308 . When the detection value of the inlet water temperature detection device 210 (at this time, the inlet water temperature is the return water temperature, that is, the detection value of the outlet water temperature detection device 220) reaches the target temperature for a few seconds, the control system 500 outputs a signal to the circulating water pump 800 to turn off The circulating water pump 800, the gas water heater 1 stops heating, and the preheating ends.

2. When the inlet water temperature of the circulating pipeline for special users reaches 30°C (threshold temperature), and the circulating water flow is low, start the circulating preheating function.

The inlet water temperature is 30°C, the target temperature is set to 40°C, the control system 500 controls the circulating water pump 800 to start, the inlet water flow detection device 230 detects the water flow signal, and provides the water flow signal to the control system 500, and the control system 500 reads The temperature data of the water temperature detection device 210 is high-temperature water (that is, the incoming water higher than 30°C), the control system 500 starts the fan 930 according to the established procedure for pre-cleaning, then the ignition device 330 ignites, and the air control system 400 opens the air control valve , the first air intake control valve 307 and the second air intake control valve 308 are closed respectively. At this time, it enters the ultra-low load working state. 311 is burning, the combustion feedback needle 340 at the ignition device 330 detects that the flame is normal combustion, and the gas water heater 1 enters the cycle preheating state.

Since the load section of a single fire row 311 is 0.8kW~2kW, according to the calculation based on the large resistance of the user's water pipe and only 3L of circulating water flow, the gas water heater 1 can heat the 3L of water by 3°C~8°C. At this time, the control system 500 will Control the air control system 400 to adjust the gas pressure, heat the water in the circulation pipeline, and wait for the detection value of the inlet water temperature detection device 210 (at this time, the inlet water temperature is the return water temperature, which is also the detection value of the outlet water temperature detection device 220) After reaching the target temperature for a few seconds, the control system 500 outputs a signal to the circulating water pump 800 to turn off the circulating water pump 800, the gas water heater 1 stops heating, and the preheating ends.

3. Turn on the continuous cycle preheating function.

The continuous cycle preheating function is to wait until the water temperature in the pipeline drops below the target temperature after a complete preheating cycle (for example, the set target temperature is 40°C, and wait until the inlet water temperature detection device 210 detects that the water temperature drops below the target temperature. 35°C), the gas water heater 1 will start the circulation preheating function again, that is, the gas water heater 1 can preheat the water in the circulation pipeline, and keep the temperature of the hot water in the circulation pipeline stable within a certain range for a long time.

Therefore, the gas water heater 1 of the present application has the ability to work at an ultra-low load. When the cycle preheating function is started again, the inlet water temperature detected by the inlet water temperature detection device 210 is higher than 30°C, and the control system 500 will directly shut down the first The first air intake control valve 307 and the second air intake control valve 308 enter the ultra-low load working state, the air control system 400 only supplies air through the first air intake passage 304, only a single fire row 311 burns, and the ignition device 330 The combustion feedback needle 340 detects that the flame is burning normally, and the gas water heater 1 enters the cycle preheating state. At this time, the control system 500 will control the gas control system 400 to adjust the gas pressure, and heat the water in the circulating waterway by 3°C to 8°C, and so on. After circulation, the water temperature in the entire pipeline will reach the target temperature. Afterwards, the control system 500 turns off the circulating water pump 800, and the gas water heater 1 stops heating. When the detection value of the inlet water temperature detection device 210 is lower than the target temperature again, the above process is repeated. .

To sum up, the gas water heater 1 according to the embodiment of the present utility model has ultra-low load working ability, can improve the adaptability of the gas water heater 1, improve user experience, and simplify the logic control program of continuous cycle preheating, improve stability and comfort.

Other configurations and operations of the gas water heater 1 according to the embodiment of the present utility model are known to those skilled in the art and will not be described in detail here.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "specific embodiments," "alternative embodiments," "example," or "some examples" are intended to mean Specific features, structures, materials or characteristics described in an embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A gas water heater, characterized in that, comprising: heat exchange system; An inlet water temperature detection device for detecting the inlet water temperature of the heat exchange system and an outlet water temperature detection device for detecting the outlet water temperature of the heat exchange system; an inlet water flow detection device for detecting the inlet water flow of the heat exchange system; A combustion system for heating the heat exchange system, the combustion system has multiple groups of fire rows that can be burned separately; an air control system for delivering gas to the combustion system, the air control system being in communication with the combustion system; A control system, the control system communicates with the inlet water temperature detection device, the outlet water temperature detection device, the inlet water flow detection device, the combustion system and the air control system respectively, and the control system communicates with the The detection value of the inlet water flow detection device, the detection value and the target temperature of the outlet water temperature detection device control the start and stop of the air control system and the combustion system and according to the detection value and threshold value of the inlet water temperature detection device The temperature controls the number of fire row combustion groups of the combustion system. 2. The gas water heater according to claim 1, wherein the combustion system comprises: A burner on which multiple sets of the fire row are formed, and the burner is configured with a plurality of air intake passages respectively communicating with the air control system and multiple sets of the fire row; At least one intake control valve, the intake control valves are respectively arranged on the intake passages and control the on-off of the intake passages; an ignition device for igniting said fire row, said control system being in communication with said ignition device and each of said intake control valves respectively. 3. The gas water heater according to claim 2, characterized in that one of the multiple groups of the fire rows only includes one fire row, and the air intake control valves are respectively arranged in the multiple groups of the fire rows. On the air intake channel that the other fire rows communicate with except the one fire row. 4. The gas water heater according to claim 3, characterized in that, the multiple groups of fire rows include a first group of fire rows, a second group of fire rows and a third group of fire rows that only contain one fire row, and the plurality of fire rows The intake passage includes a first intake passage communicated with the first group of fire rows, a second intake passage communicated with the second group of fire rows, and a third intake passage communicated with the third group of fire rows There are two air intake passages, and the intake control valves are two and include a first intake control valve arranged on the second intake passage and a second intake control valve arranged on the third intake passage. 5. The gas water heater according to claim 2, wherein the combustion system further comprises a plurality of combustion feedback needles, and the plurality of combustion feedback needles are respectively arranged at the ignition device and between adjacent groups of fire rows and communicate with the control system. 6. The gas water heater according to claim 2, wherein the air intake control valve is a solenoid valve. 7. The gas water heater according to any one of claims 1-6, characterized in that it comprises: A water inlet pipeline, the water inlet pipeline is connected to the heat exchange system, and the inlet water temperature detection device and the inlet water flow detection device are arranged on the water inlet pipeline; A water outlet pipeline, the water outlet pipeline is connected to the heat exchange system and the outlet water temperature detection device is arranged on the water outlet pipeline. 8. The gas water heater according to claim 7, further comprising a circulating water pump, the circulating water pump is arranged on the water inlet pipeline and communicates with the control system. 9. The gas water heater according to any one of claims 1-6, further comprising a smoke exhaust system for exhausting the smoke generated by the combustion system, the smoke exhaust system and the control system communication. 10. The gas water heater according to claim 9, wherein the smoke exhaust system comprises: a casing, the casing has a combustion chamber, and the heat exchange system and the combustion system are arranged in the combustion chamber; A fume collecting hood, the fume collecting hood is arranged on the top of the housing and has a smoke exhaust port communicating with the combustion chamber; A fan, the fan is arranged under the casing and communicates with the combustion chamber, and communicates with the control system.