Multi-burner and gas water heater

Abstract

The present invention discloses a multi-burner and a gas water heater. The multi-burner includes a premixer and multiple burners. The premixer is used to receive gas and air and premix them. The burner forms a combustion chamber. The combustion chambers of the multiple burners are respectively connected to the premixer. The combustion chamber of at least one multi-burner is used to receive the mixed gas provided by the premixer and ignite it for combustion. In the present invention, the premixer premixes gas and air to form a mixed gas. The multiple burners are all connected to the premixer to achieve parallel connection of the multiple burners. The premixer can provide each burner with the mixed gas required for combustion. By selecting the required number of burners to work synchronously, different combustion powers of the multi-burner can be enabled, thereby obtaining different heat loads and producing different heat exchange effects.

Description

Technical Field

[0001] The present invention relates to the technical field of water heater combustion, and in particular to a multi-combustion engine and a gas water heater. Background Art

[0002] Existing gas water heaters are generally equipped with a burner, which generates heat through combustion to achieve the purpose of heat exchange with tap water. However, the combustion power of existing gas water heaters is generally single and fixed, which limits the application of gas water heaters. Summary of the Invention

[0003] The main purpose of the present invention is to provide a multi-combustion engine and a gas water heater, aiming to solve the problem of single combustion power of traditional gas water heaters.

[0004] To achieve the above-mentioned object, the present invention proposes a multi-combustion engine for a gas water heater, the multi-combustion engine comprising:

[0005] A premixer for receiving and premixing gas and air; and

[0006] a plurality of burners, the burners forming a combustion chamber;

[0007] The combustion chambers of the plurality of burners are respectively connected to the premixer, and the combustion chamber of at least one of the multi-burners is used to receive the mixed gas provided by the premixer and ignite it for combustion.

[0008] In one embodiment, at least one of the burners comprises:

[0009] A housing is formed with the combustion chamber, the combustion chamber comprising a first combustion chamber and a second combustion chamber that are connected in sequence, the first combustion chamber being used to receive the mixed gas provided by the premixer;

[0010] a preheating burner, configured to ignite the mixed gas in the first combustion chamber and heat the temperature in the first combustion chamber to a preset temperature; and

[0011] The injector is used to inject gas and / or air into the second combustion chamber, so that a high-temperature air combustion reaction occurs in the second combustion chamber.

[0012] In one embodiment, the multi-burner also includes a plurality of regulating valves arranged in one-to-one correspondence with the plurality of burners, and each regulating valve is arranged on the connecting pipeline between the premixer and the corresponding combustion chamber to adjust the intake amount of the mixed gas of the corresponding combustion chamber.

[0013] In one embodiment, the multi-combustion engine further comprises:

[0014] An input device for inputting a power demand value of the multi-combustion engine; and

[0015] The controller is electrically connected to the input device and the plurality of regulating valves respectively, so as to control at least one regulating valve to operate according to the power demand value.

[0016] In one embodiment, the input device comprises:

[0017] a water flow sensor for sensing the water inflow of the gas water heater; and

[0018] a first temperature sensor, configured to detect the water inlet temperature of the gas water heater;

[0019] The controller is electrically connected to the water flow sensor and the temperature detection component respectively, so as to obtain the power demand value according to the water flow sensor, the water inlet temperature and the received user-set temperature.

[0020] In one embodiment, the input device further comprises a second temperature sensor, the second temperature sensor being used to sense the actual outlet water temperature of the gas water heater;

[0021] The controller is electrically connected to the second temperature sensor to control the operation of the regulating valve according to a deviation between the actual outlet water temperature and the user-set temperature.

[0022] In one embodiment, the multi-combustion machine further comprises a sensor, wherein the sensor is configured to trigger a water use signal when sensing that the gas water heater uses water;

[0023] The controller is electrically connected to the sensor to control the input device to operate when the water usage signal is received.

[0024] In one embodiment, the sensor is a water flow sensor.

[0025] In one embodiment, a plurality of the burners are arranged side by side and spaced apart;

[0026] The premixer is communicated with the combustion chambers of the plurality of burners respectively through a pipeline.

[0027] In one embodiment, the premixer includes a housing and a fan, the housing is formed with a gas channel, an air channel, and a mixing channel, an air inlet of the mixing channel is communicated with the gas channel and the air channel respectively, and an air outlet of the mixing channel is communicated with the plurality of combustion chambers respectively;

[0028] The fan is arranged in the mixing channel.

[0029] In one embodiment, the premixer further includes a gas proportional valve, which is provided in the gas passage to adjust the gas intake volume of the gas passage.

[0030] In one embodiment, the multi-combustion engine further comprises:

[0031] An input device for inputting a power demand value of the multi-combustion engine; and

[0032] The controller is electrically connected to the input device, the gas proportional valve, and the fan respectively, so as to control the operation of the gas proportional valve and the fan according to the power demand value.

[0033] In one embodiment, a plurality of premixers are provided, and each of the premixers is communicated with the combustion chambers of a plurality of burners respectively.

[0034] In addition, to achieve the above-mentioned object, the present invention further provides a gas water heater, comprising a main body, a heat exchanger, and a multi-burner, wherein a heat exchange chamber is provided in the main body, the heat exchanger is provided in the heat exchange chamber, a flue gas outlet of the multi-burner is communicated with the heat exchange chamber, and the multi-burner comprises:

[0035] A premixer for receiving and premixing gas and air; and

[0036] a plurality of burners, the burners forming a combustion chamber;

[0037] The combustion chambers of the plurality of burners are respectively connected to the premixer, and the combustion chamber of at least one of the multi-burners is used to receive the mixed gas provided by the premixer and ignite it for combustion.

[0038] In the technical solution provided by the present invention, a premixer premixes gas and air to form a mixed gas; multiple burners are connected to the premixer to realize parallel connection of multiple burners; the premixer can provide each burner with the mixed gas required for combustion, and by selecting the required number of burners to work synchronously, different combustion powers of the multi-burner can be enabled, thereby obtaining different heat loads and producing different heat exchange effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0040] Figure 1 A schematic structural diagram of an embodiment of a multi-combustion engine provided by the present invention;

[0041] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0042] Figure 3 for Figure 2 A longitudinal section diagram of part of the structure of the middle burner;

[0043] Figure 4 for Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0044] Description of Figure Numbers:

[0045] Label name Label name 1 Multi-burner 220 Preheat burner 100 Premixer 230 ejector 110 chassis 300 Control valve 111 Gas channel 410 Water flow sensor 112 air channel 420 First temperature sensor 113 Mixing Channel 430 Second temperature sensor 120 fan 440 Sensor 130 Gas proportional valve 500 pipeline 200 burner 510 Connecting pipes 210 case 2 water inlet pipe 211 First combustion chamber 3 outlet pipe 212 Second combustion chamber 4 exhaust pipe

[0046] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Existing gas water heaters are generally equipped with a burner, which generates heat through combustion to achieve the purpose of heat exchange with tap water. However, the combustion power of existing gas water heaters is generally single and fixed, which limits the application of gas water heaters.

[0051] The present invention provides a multi-burner, which is used in gas water heaters and related products and equipment including gas wall-mounted boilers that use gas combustion to generate high-temperature hot water for home bathing and heating. For ease of understanding, the following application to gas water heaters is taken as an example. Figures 1 to 4 This is an embodiment of the multi-combustion engine provided by the present invention.

[0052] See also Figures 1 to 4 The multi-burner 1 provided by the present invention includes a premixer 100 and a plurality of burners 200, wherein the premixer 100 is used to receive gas and air and premix them; the burner 200 forms a combustion chamber; the combustion chambers of the plurality of burners 200 are respectively connected to the premixer 100, and at least one combustion chamber of the multi-burner 1 is used to receive the mixed gas provided by the premixer 100 and ignite it for combustion.

[0053] In the technical solution provided by the present invention, the premixer 100 premixes the fuel gas and the air to form a mixed gas; multiple burners 200 are connected to the premixer 100 to realize parallel connection of multiple burners 200; the premixer 100 can provide each burner 200 with the mixed gas required for combustion. By selecting the required number of burners 200 to work synchronously, different combustion powers of the multi-burner 1 can be enabled, thereby obtaining different heat loads and producing different heat exchange effects.

[0054] It is understood that the premixer 100 generally includes a housing 110, which is formed with a gas channel 111, an air channel 112, and a mixing channel 113. The air inlet of the mixing channel 113 is connected to the gas channel 111 and the air channel 112 respectively, and the air outlet of the mixing channel 113 is connected to the multiple combustion chambers respectively. The gas channel 111 is used to receive external gas, and the air channel 112 is used to receive external air. The gas and air are mixed in the mixing channel 113.

[0055] In the mixed gas premixed by the premixer 100, the ratio of gas to air must be set within an appropriate range to ensure that the burner 200 can burn fully and efficiently in the mixed gas environment.

[0056] Based on this, in a further embodiment, the premixer 100 may be provided with proportional valves in the gas passage 111 and / or the air passage 112. For differentiation, the proportional valve provided in the gas passage 111 may be defined as the gas proportional valve 130, and the proportional valve provided in the air passage 112 as the air proportional valve. By operating the gas proportional valve 130 and / or the air proportional valve, the gas intake amount and / or air intake amount in the premixer 100 can be adjusted, thereby obtaining a mixed gas of the desired proportion. In this embodiment, the gas proportional valve 130 is provided in the gas passage 111, and the gas intake amount can be correspondingly adjusted by adjusting the opening of the gas proportional valve 130.

[0057] In addition, the premixer 100 may also be provided with a fan 120, which can drive the flow of gas and / or air within the premixer 100, so that the airflow can enter each combustion chamber in a generally desired direction and at a desired speed. In a specific application, the fan 120 can be provided in the air passage 112 to accelerate the circulation of air, and cooperate with the gas proportional valve 130 to achieve separate control of the air intake and gas intake. Alternatively, the fan 120 can be provided in the mixing passage 113, not only to drive the circulation of gas, air, and mixed gas, but also to disperse the gas and air under the disturbance of the rotating blades of the fan 120, thereby achieving a more complete mixing.

[0058] The premixer 100 and the multiple burners 200 are generally connected via a conduit 500. Specifically, the air inlet of the conduit 500 is connected to the outlet of the mixing channel 113 of the premixer 100. The conduit 500 has multiple air outlets, each of which is connected to the air inlets of the multiple combustion chambers. The provision of the conduit 500 helps to stabilize the flow rate of the mixed gas and evenly distribute the mixed gas output from the premixer 100 to the multiple burners 200.

[0059] The number of premixers 100 is not limited in this design and can be one or more according to actual needs. When a plurality of premixers 100 are provided, each of the plurality of premixers 100 is connected to a plurality of burners 200, i.e., a plurality of burners 200 are connected in parallel at the mixed gas outlet of each premixer 100. The provision of a plurality of premixers 100 can increase the premixing amount of the mixed gas, thereby providing sufficient mixed gas for the plurality of burners 200 when the plurality of burners 200 are working simultaneously.

[0060] Burner 200 receives the mixed gas provided by premixer 100 and ignites it, allowing it to stably combust within the combustion chamber of burner 200, producing high-temperature flue gas. The combustion chamber typically has a mixed gas inlet and a flue gas outlet. These can be located anywhere within the combustion chamber, such as on opposite sides or spaced apart on a single surface. The flue gas outlet communicates with the heat exchange chamber of the gas water heater, allowing the high-temperature flue gas generated in the combustion chamber to exchange heat with tap water, ultimately producing hot water.

[0061] It should be noted that the present design is not limited to requiring all of the multiple burners 200 to be turned on each time the gas water heater is operated. At least one of the multiple burners 200 can be selected to be turned on according to actual needs.

[0062] In addition, each burner 200 generally has a rated power or maximum power that meets its specifications. According to different application requirements, the specifications of multiple burners 200 can be set to be all the same, or set to be at least partially different, so that a more diverse and energy-saving power scheme can be formed between multiple burners 200.

[0063] The multiple burners 200 can be arranged on the multi-combustion engine 1 in any suitable manner to accommodate the various shapes, sizes, and installation orientations of the multi-combustion engine 1. In one embodiment, the multiple burners 200 are arranged linearly, side by side, and spaced apart. This arrangement also simplifies and facilitates the layout of the aforementioned pipeline 500, which extends directly along the arrangement direction of the multiple combustion chambers.

[0064] The burner 200 can be a conventional combustion burner 200, which will not be described in detail here; alternatively, among multiple burners 200, at least one burner 200 can be configured to perform high-temperature air combustion. It is understood that the key characteristics of high-temperature air combustion are: the chemical reaction must occur in a high-temperature, low-oxygen environment, the reactant temperature must be above its auto-ignition temperature, the maximum temperature rise during combustion must be below its auto-ignition temperature, and the oxygen volume fraction is diluted to an extremely low concentration by the combustion products. Compared to conventional combustion, under this combustion state, the pyrolysis of the fuel is suppressed, the flame thickness becomes thicker, and the flame front disappears, resulting in very uniform temperatures throughout the furnace, low peak combustion temperatures, minimal noise, and significantly reduced NOx and CO emissions. However, achieving high-temperature air combustion requires certain conditions: the oxygen concentration in most areas of the furnace must be below a certain value, generally below 5% to 10%, to ensure sufficient combustion and uniform combustion of the fuel gas, and the temperature must be above the fuel's auto-ignition point to maintain auto-ignition.

[0065] Specifically, the burner 200 for realizing high-temperature air combustion includes a shell 210, a preheating burner 220 and an injector 230, wherein the shell 210 forms the combustion chamber, and the combustion chamber includes a first combustion chamber 211 and a second combustion chamber 212 connected in sequence, and the first combustion chamber 211 is used to receive the mixed gas provided by the premixer 100; the preheating burner 220 is used to ignite the mixed gas in the first combustion chamber 211 and heat the temperature in the first combustion chamber 211 to a preset temperature; the injector 230 is used to inject gas and / or air into the second combustion chamber 212, so that a high-temperature air combustion reaction occurs in the second combustion chamber 212.

[0066] The first combustion chamber 211 and the second combustion chamber 212 are sequentially connected, so that the airflow composed of gas and / or air, as well as high-temperature flue gas can flow between the first combustion chamber 211 and the second combustion chamber 212. Specifically, the mixed gas inlet of the combustion chamber is set at the first combustion chamber 211, and can be optionally set at the side of the first combustion chamber 211 away from the second combustion chamber 212, so that the first combustion chamber 211 can receive the mixed gas provided by the pre-mixed gas; the flue gas outlet of the combustion chamber is set at the second combustion chamber 212, and can be optionally set at the side of the second combustion chamber 212 away from the first combustion chamber 211, so that the high-temperature flue gas generated in the second combustion chamber 212 can be discharged through the flue gas outlet after sufficient air combustion.

[0067] The first combustion chamber 211 and the second combustion chamber 212 may be formed on the same shell 210 or on different shells 210 . The first combustion chamber 211 and the second combustion chamber 212 may be connected to each other by detachably connecting the different shells 210 .

[0068] The preheating burner 220 is arranged in the first combustion chamber 211, and can be specifically arranged at the mixed gas inlet of the first combustion chamber 211; the preheating burner 220 ignites the mixed gas in the first combustion chamber 211, so that the mixed gas burns and forms a preset high temperature in the area, thereby achieving high-temperature preheating and forming high-temperature flue gas.

[0069] The injector 230 injects gas and / or air into the second combustion chamber 212. The gas is ignited by the high-temperature gas and continues to burn in the second combustion chamber 212, forming a jet combustion area. In addition, the gas and / or air injected at a preset speed cooperate with the above-mentioned high-temperature flue gas to form a suction effect in the second combustion chamber 212, forming a flue gas reflux area, so that part of the high-temperature flue gas (waste gas rich in N2 and CO2) circulates inside the second combustion chamber 212 to dilute the reactants, and then fully dilutes the injected gas and air to form a lower oxygen concentration, reduce the combustion reaction speed, and continue to maintain a higher temperature in the second combustion chamber 212, ensuring that the temperature in the second combustion chamber 212 is higher than the auto-ignition point of the fuel, achieving auto-ignition, and thus realizing high-temperature air combustion.

[0070] By preheating the air at high temperature and coordinating it with a high-speed jet to draw in and dilute the high-temperature flue gas, not only can the gas be fully burned and the emission of pollutants be reduced, but the combustion in the second combustion chamber 212 can also be made more uniform, and the problem of local excessive combustion and noise generation will not occur.

[0071] As can be seen from the above, the target temperature of the high-temperature preheated air cannot be too low, and should be no less than 600 degrees Celsius. Generally, controlling the temperature between 600 and 1200 degrees Celsius ensures that the high-temperature gas and the airflow ejected from the injector 230 achieve good automatic combustion, eliminating the need for ignition. There are various ways to achieve high-temperature preheated air, such as controlling the heating time, controlling the gas-to-air ratio, maintaining heat, and increasing the residence time of the high-temperature gas in the second combustion chamber 212.

[0072] The injectors 230 may be disposed on the sidewalls of the second combustion chamber 212, with multiple injectors 230 spaced apart along the circumference of the second combustion chamber 212. The multiple injectors 230 may be evenly distributed along each sidewall of the second combustion chamber 212, or may be concentrated on opposite sidewalls of the second combustion chamber 212. The injection direction of the injectors 230 is not limited and may be directed in any horizontal direction or slightly tilted toward the preheating burner 220.

[0073] Furthermore, in one embodiment, the multi-combustion engine 1 further includes a plurality of regulating valves 300 corresponding to the plurality of burners 200. Each regulating valve 300 is provided on the connecting pipe 510 between the premixer 100 and the corresponding combustion chamber to regulate the amount of mixed gas entering the corresponding combustion chamber. The regulating valve 300 can adjust the opening and closing of the corresponding connecting pipe 510, as well as the flow of mixed gas at any opening, thereby adjusting the amount of mixed gas entering the corresponding combustion chamber, making the amount of mixed gas entering each combustion chamber individually adjustable and controllable.

[0074] Based on the above, in one embodiment, the multi-burner 1 further includes a sensing device and a controller, wherein the sensing device is used to sense the power demand value of the multi-burner 1; the controller is electrically connected to the sensing device and the plurality of regulating valves 300, respectively, to control at least one regulating valve 300 to operate according to the power demand value, so that at least one burner 200 operates to meet the power demand value.

[0075] The specific embodiment of the sensing device is not limited. In one embodiment, the sensing device may be an input device, which may be, but is not limited to, various buttons, a touch screen, a microphone, etc. That is, the user can manually press or touch the display and control structure of the gas water heater, or directly enter the required power value by voice. It should be noted that when the sensing device is an input device, the user is not limited to entering only power values. Depending on different application scenarios, the user can enter any parameter that can ultimately be converted into a power value, for example, a temperature value, an application environment, the current season and region, etc.

[0076] Of course, the sensing device can also be a detection device. Specifically, in one embodiment, the sensing device includes a water flow sensor 410 and a first temperature sensor 420, wherein the water flow sensor 410 is used to sense the water inlet volume of the gas water heater; the first temperature sensor 420 is used to detect the water inlet temperature of the gas water heater; wherein the controller is electrically connected to the water flow sensor 410 and the temperature detection component respectively to obtain the power demand value according to the water flow sensor 410, the water inlet temperature and the received user-set temperature.

[0077] The user-set temperature can be directly obtained through a communication connection with the gas water heater's control device. Specifically, when the inlet water temperature and the user-set temperature are known, the required temperature rise can be calculated. The product of the temperature rise and the current water flow rate can be converted to the required heat load corresponding to the required temperature rise. Since the specifications of each burner 200 are known, the required heat load can be used to determine the corresponding power demand value.

[0078] Furthermore, in one embodiment, the sensing device also includes a second temperature sensor 430, which is used to sense the actual water outlet temperature of the gas water heater; the controller is electrically connected to the second temperature sensor 430 to control the operation of the regulating valve 300 according to the deviation value between the actual water outlet temperature and the user-set temperature.

[0079] It can be understood that the second temperature sensor 430 is capable of detecting the actual outlet water temperature value of the hot water produced after the operation of at least one burner 200. Under normal circumstances, the actual outlet water temperature should be approximately the same as the user-set temperature, and the deviation between the two will not exceed the preset deviation. At this time, there is no need to change the previous setting, and the control valve 300 continues to operate according to the previous setting; and when there is a large deviation between the actual outlet water temperature and the user-set temperature, for example, when the deviation exceeds the preset deviation, it indicates that there is a problem with the previous setting, and the working scheme of the control valve 300 needs to be adjusted. For example, when the actual outlet water temperature is much lower than the user-set temperature, the opening of at least one control valve 300 can be appropriately increased to provide more mixed gas to the corresponding combustion chamber to increase the combustion power of the burner 200; conversely, when the actual outlet water temperature is much higher than the user-set temperature, the opening of at least one control valve 300 can be appropriately reduced to provide less mixed gas for the corresponding combustion to reduce the combustion power of the burner 200.

[0080] In addition, when there is a large deviation between the actual water outlet temperature and the user set temperature, it can also indicate that some components in the multi-burner 1, such as a regulating valve 300, a preheating burner 220 or an injector 230, have abnormalities and can be checked in time.

[0081] In order to accurately determine whether the user currently needs water, that is, to determine whether the multi-burner 1 currently needs to work, in one embodiment, the multi-burner 1 also includes a sensor 440, and the sensor 440 is used to trigger a water use signal when it senses that the gas water heater is using water; the controller is electrically connected to the sensor 440 to control the sensing device to work when the water use signal is received.

[0082] Similarly, sensor 440 can be an input device for the user to directly input whether water is needed; or sensor 440 can be any sensor, such as a human body sensor 440, which can determine that the user needs water when it senses that the user is performing a setting operation in a set area. Setting operations in a set area can include, but are not limited to: closing the water outlet and placing dirty dishes in the kitchen sink, or removing clothes in the bathroom.

[0083] Of course, the sensor 440 can also directly adopt the water flow sensor 410 mentioned above. When the water flow sensor 410 senses that the current water flow reaches the set flow value, it indicates that there is a current water demand, which can trigger the sensing and control of the above-mentioned sensing device and controller. After the water flow stabilizes, the specific water flow can be detected.

[0084] It should be noted that the water flow sensor 410, the first temperature sensor 420 and the second temperature sensor 430 mentioned above can be set as a group, or set as multiple corresponding to multiple burners 200, so as to sense the above parameters of each burner 200 respectively, thereby realizing flexible sensing and control of each burner 200.

[0085] Since the multiple burners 200 require different mixed gas intake volumes when operating at different powers, in one embodiment, when the multi-burner 1 includes a sensing device and a controller as described above, the controller can be configured to be electrically connected to the sensing device, the gas proportional valve 130, and the fan 120, respectively, so as to control the operation of the gas proportional valve 130 and the fan 120 according to the power demand value.

[0086] For example, when the power demand value is large, so that more burners 200 need to be started and operated at the same time, the opening of the gas proportional valve 130 can be increased and the speed of the fan 120 can be accelerated to achieve more premixing of gas and air; conversely, when the power demand value is small, so that fewer burners 200 need to be started and operated at the same time, the opening of the gas proportional valve 130 can be reduced and the speed of the fan 120 can be slowed down to reduce the premixing of gas and air.

[0087] In addition, to achieve the above-mentioned purpose, the present invention also provides a gas water heater, which includes a main body, a heat exchanger and the multi-burner 1 as described above, a heat exchange chamber is provided in the main body, the heat exchanger is provided in the heat exchange chamber, and the flue gas outlet of the multi-burner 1 is connected to the heat exchange chamber.

[0088] The heat exchanger is connected to an external water source, such as tap water. The high-temperature flue gas entering the heat exchange chamber through the flue gas outlet of the burner 200 carries enough heat to continuously exchange heat with the water in the heat exchanger, so that the water temperature rises to the required level to produce hot water.

[0089] The gas water heater is generally provided with a control device. The control device can directly constitute the controller in the multi-combustion engine 1, or be electrically connected to the controller to achieve signal communication between the control device and the controller.

[0090] In addition, multiple burners 200 can be connected to the same exhaust pipe 4, the same water inlet pipe 2 and the same water outlet pipe 3. The first temperature sensor 420 and the water flow sensor 410 are arranged on the water inlet pipe 2, and the second temperature sensor 430 is arranged on the water outlet pipe 3.

[0091] It should be noted that the detailed structure of the burner 200 in the gas water heater can refer to the embodiment of the above-mentioned burner 200, which will not be repeated here; since the above-mentioned burner 200 is used in the gas water heater of the present invention, the embodiment of the gas water heater of the present invention includes all technical solutions of all embodiments of the above-mentioned burner 200, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-combustion engine for a gas water heater, characterized in that: The multi-combustion engine comprises: A premixer for receiving and premixing gas and air; and a plurality of burners, the burners forming a combustion chamber; Wherein, the multiple burners are connected in parallel, the combustion chambers of the multiple burners are respectively connected to the premixer, and the combustion chamber of at least one of the multi-burner is used to receive the mixed gas provided by the premixer and ignite it for combustion; Among the plurality of burners, at least one of the burners is configured to be a burner capable of achieving high-temperature air combustion; At least one of the burners comprises: A housing is formed with the combustion chamber, the combustion chamber comprising a first combustion chamber and a second combustion chamber that are connected in sequence, the first combustion chamber being used to receive the mixed gas provided by the premixer; a preheating burner, configured to ignite the mixed gas in the first combustion chamber and heat the temperature in the first combustion chamber to a preset temperature; and The injector is used to inject gas and / or air into the second combustion chamber so that a high-temperature air combustion reaction occurs in the second combustion chamber. The injection direction of the injector is slightly inclined toward the direction of the preheating burner.

2. The multi-combustion engine according to claim 1, characterized in that: The multi-combustion engine also includes a plurality of regulating valves arranged in a one-to-one correspondence with the plurality of burners, and each regulating valve is arranged on the connecting pipeline between the premixer and the corresponding combustion chamber to adjust the intake amount of the mixed gas of the corresponding combustion chamber.

3. The multi-combustion engine according to claim 2, characterized in that: The multi-combustion engine further comprises: An input device for inputting a power demand value of the multi-combustion engine; and The controller is electrically connected to the input device and the plurality of regulating valves respectively, so as to control at least one regulating valve to operate according to the power demand value.

4. The multi-combustion engine according to claim 3, characterized in that: The input device comprises: a water flow sensor for sensing the water inflow of the gas water heater; and a first temperature sensor, configured to detect the water inlet temperature of the gas water heater; The controller is electrically connected to the water flow sensor and the first temperature sensor respectively, so as to obtain the power demand value according to the water flow sensor, the water inlet temperature and the received user-set temperature.

5. The multi-combustion engine according to claim 4, characterized in that: The input device further includes a second temperature sensor, which is used to sense the actual outlet water temperature of the gas water heater; The controller is electrically connected to the second temperature sensor to control the operation of the regulating valve according to a deviation between the actual outlet water temperature and the user-set temperature.

6. The multi-combustion engine according to claim 3, characterized in that: The multi-combustion machine further includes a sensor, which is used to trigger a water use signal when sensing that the gas water heater uses water; The controller is electrically connected to the sensor to control the input device to operate when the water usage signal is received.

7. The multi-combustion engine according to claim 6, characterized in that: The sensor is a water flow sensor.

8. The multi-combustion engine according to claim 1, characterized in that: A plurality of the burners are arranged side by side and spaced apart; The premixer is communicated with the combustion chambers of the plurality of burners respectively through a pipeline.

9. The multi-combustion engine according to claim 1, characterized in that: The premixer includes a housing and a fan, the housing is formed with a gas channel, an air channel and a mixing channel, the air inlet of the mixing channel is connected to the gas channel and the air channel respectively, and the air outlet of the mixing channel is connected to the plurality of combustion chambers respectively; The fan is arranged in the mixing channel.

10. The multi-combustion engine according to claim 9, characterized in that: The premixer further comprises a gas proportional valve, which is arranged in the gas passage and is used to adjust the gas intake amount of the gas passage.

11. The multi-combustion engine according to claim 10, characterized in that: The multi-combustion engine further comprises: An input device for inputting a power demand value of the multi-combustion engine; and The controller is electrically connected to the input device, the gas proportional valve, and the fan respectively, so as to control the operation of the gas proportional valve and the fan according to the power demand value.

12. The multi-combustion engine according to claim 1, wherein: There are a plurality of premixers, and each of the premixers is communicated with the combustion chambers of a plurality of burners respectively.

13. A gas water heater, characterized in that: It comprises a main body, a heat exchanger and a multi-burner according to any one of claims 1 to 12, wherein a heat exchange chamber is provided in the main body, the heat exchanger is provided in the heat exchange chamber, and the flue gas outlet of the multi-burner is connected to the heat exchange chamber.

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