Gas Equipment

Abstract

The present invention discloses a gas device, including: a burner; a gas premixing tube, the gas premixing tube defines an airflow channel, the airflow channel has an air inlet and an air outlet, in the direction from the air inlet to the air outlet, the airflow channel is divided into a contraction section, a mixing section and a diffusion section, and the gas premixing tube has a gas inlet; a gas supply device, the gas supply device is connected to the gas inlet; a fan, the fan is connected to the airflow channel and is used to drive the gas to flow from the air inlet to the air outlet; a gas flame detection device, the gas flame detection device is used to detect the combustion flame condition of the burner; a controller, the controller is electrically connected to the gas flame detection device and the fan, and the controller regulates the opening of the gas inlet and the speed of the fan according to the flame detection signal provided by the gas flame detection device. The gas device according to the embodiment of the present invention can obtain a better air-fuel ratio under different gas source conditions, achieve a stable load regulation ratio, and reduce exhaust gas emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and more specifically, to a gas device. Background Art

[0002] Fully premixed combustion refers to a combustion method in which the fuel gas is mixed with air before combustion, and no air supply is required during the combustion process. This combustion method has a fast flame propagation speed and high combustion efficiency.

[0003] The Venturi premixer is a necessary device in the pneumatic full premixed combustion system. The Venturi premixer injects gas through air. At present, most products are single Venturi premixers, and their maximum load to minimum load ratio (referred to as the adjustment ratio) is generally 5:1, and the better one is 7:1. The minimum load to maximum load ratio of the double Venturi premixer can reach 10:1.

[0004] For fully premixed wall-mounted boilers, the larger the adjustment ratio, the wider the load adjustment range when heating or using hot water, and the higher the user comfort. When the adjustment ratio is small, the mixed gas cannot be stably supplied when heating or using hot water, resulting in unstable combustion.

[0005] However, the gas sources in different regions vary greatly. For example, the gas sources in China and Europe vary greatly. When the gas source environment used by the gas equipment differs greatly from the standard gas composition (the gas source composition debugged before the product leaves the factory), it is impossible to ensure that the mixing ratio of air and gas is within the preset range. In this way, when the gas equipment is running, it is easy to cause a sharp increase in harmful gas emissions. In other words, the current pneumatic full premixed combustion system cannot make adaptive adjustments to the air intake and gas intake according to the actual gas source conditions to ensure that the exhaust gas emissions are within an acceptable range. Summary of the invention

[0006] The present invention aims to solve one of the above technical problems at least to a certain extent.

[0007] To this end, the present invention proposes a gas-fired device, which has low requirements on gas source conditions, has a better air-fuel ratio, and has low exhaust gas emissions.

[0008] The gas equipment according to the embodiment of the present invention comprises: a burner; a gas premixing tube, the gas premixing tube is used to provide a mixed gas of gas and air to the burner, the gas premixing tube defines an air flow channel, the air flow channel has an air inlet and an air outlet, in the direction from the air inlet to the air outlet, the air flow channel is divided into a contraction section with a gradually decreasing cross-section, a mixing section with a constant cross-section and a diffusion section with a gradually increasing cross-section, the gas premixing tube has a gas inlet that runs through its wall thickness; a gas supply device, the gas supply device is connected to the gas inlet; a fan, the fan is connected to the air flow channel and is used to drive the gas to flow from the air inlet to the air outlet; a gas flame detection device, the gas flame detection device is used to detect the combustion flame condition of the burner; a controller, the controller is electrically connected to the gas flame detection device and the fan respectively, and the controller adjusts the opening of the gas inlet and the rotation speed of the fan according to the flame detection signal provided by the gas flame detection device.

[0009] According to the gas equipment of the embodiment of the present invention, the combustion flame condition of the burner is monitored in real time by the gas flame detection device, and the controller adjusts the opening size of the gas inlet and the speed of the fan according to the flame signal fed back by the gas flame detection device, thereby ensuring that the gas equipment can obtain a better air-fuel ratio under different gas source conditions, achieve a stable load regulation ratio, and reduce exhaust gas emissions.

[0010] In addition, the gas device according to the embodiment of the present invention may also have the following additional technical features:

[0011] According to some embodiments of the present invention, the mixing section is separated into a first throat section and a second throat section which are independent of each other, the first throat section and the second throat section respectively corresponding to different gas inlets, the inlet of the first throat section is connected to the contraction section, the outlet of the first throat section is connected to the diffusion section, the outlet of the second throat section is connected to the diffusion section, and the inlet of the second throat section can be selectively connected to the contraction section.

[0012] In an optional embodiment, a sealed gas chamber is formed on the outer periphery of the gas premixing pipe, and the gas chamber is connected to the gas supply device.

[0013] In a further optional embodiment, the combustion gas chamber is an annular chamber, one end of the annular chamber is sealedly connected to the inlet end of the contraction section, and the other end of the annular chamber is sealedly connected to the outlet end of the diffusion section.

[0014] In an optional embodiment, a selectively openable baffle is provided on a side of the second throat section facing the contraction section.

[0015] In a further optional embodiment, the gas chamber is built into the air flow channel.

[0016] In a further optional embodiment, the opening degree of the baffle is positively correlated with the opening of the gas inlet corresponding to the second throat section.

[0017] According to some embodiments of the present invention, the gas premixing pipe further includes: a damper and a driving device, wherein the driving device drives the damper to open or close the gas inlet.

[0018] In an optional embodiment, the driving device is a stepper motor, and the stepper motor is connected to the controller.

[0019] According to some embodiments of the present invention, the gas device further comprises: a solenoid valve, wherein a valve plug of the solenoid valve is arranged opposite to the gas inlet, and the opening size of the gas inlet is controlled by the displacement of the valve plug of the solenoid valve.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic diagram of a partial structure of a gas device according to some embodiments of the present invention;

[0023] Figure 2 is a schematic diagram of a partial structure of a gas device according to some other embodiments of the present invention;

[0024] Figure 3 is a schematic diagram of a partial structure of a gas device according to some other embodiments of the present invention;

[0025] Figure 4 It is a schematic diagram of a partial structure of a gas device according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Gas equipment 100;

[0028] Gas premixing pipe 10;

[0029] Air flow channel 11;

[0030] Air inlet 111;

[0031] Air outlet 112;

[0032] Contraction section 113; inlet end 1131;

[0033] Mixing section 114; gas inlet 1141; first throat section 1142; second throat section 1143; baffle 1144;

[0034] Diffusion section 115; outlet end 1151;

[0035] Air door 116;

[0036] Driving device 117;

[0037] Annular cavity 20; Gas cavity 21; DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] Refer to the following Figure 1-Figure 4 , describing a gas device 100 according to an embodiment of the present invention, the gas device 100 is a device that uses heat generated by gas combustion for heating or warming, and the gas device 100 may be a gas water heater or a wall-mounted boiler.

[0040] The gas equipment 100 of the embodiment of the present invention includes: a burner (not shown in the figure), a gas premixing pipe 10, a gas supply device (not shown in the figure), a fan (not shown in the figure), a gas flame detection device (not shown in the figure) and a controller (not shown in the figure).

[0041] Specifically, the gas premixing pipe 10 is used to provide a mixed gas of gas and air to the burner. Figure 1-3 As shown, the gas premixing tube 10 defines an air flow channel 11, which has an air inlet 111 and an air outlet 112. In the direction from the air inlet 111 to the air outlet 112 (i.e., the gas flow direction), the air flow channel 11 is divided into a contraction section 113 with a gradually decreasing cross-section, a mixing section 114 with a constant cross-section, and a diffusion section 115 with a gradually increasing cross-section. The gas premixing tube 10 has a gas inlet 1141 that runs through the wall thickness thereof, and the gas inlet 1141 is connected to a gas supply device.

[0042] It should be noted that the contraction section 113, the mixing section 114 and the diffusion section 115 of the gas premixing pipe 10 can be independent pipe body structures or an integrally formed pipe body structure. Regardless of the forming method adopted, the contraction section 113, the mixing section 114 and the diffusion section 115 are seamlessly connected.

[0043] In other words, the gas premixing pipe 10 provides a place where the gas and air can be premixed. Figure 1-Figure 3 As shown, air flows into the air flow channel 11 from the air inlet 111, and the gas enters the air flow channel 11 through the gas inlet 1141. As the air flows from the contraction section 113 to the mixing section 114, the flow area changes suddenly, and the air flow accelerates, thereby forming a local negative pressure in the mixing section 114 area, so that the gas is injected into the air flow channel 11 and mixed with the air. When the mixed gas flows to the diffusion section 115, the flow area changes suddenly again, which intensifies the mixing degree of air and gas, so that the air and gas are fully mixed, providing a better mixed gas for the burner.

[0044] The fan is connected to the air flow channel 11 to drive the gas to flow from the air inlet 111 to the air outlet 112. When the gas device 100 is running at a large load, the air intake and the gas intake increase synchronously, wherein the air intake per unit time can be increased by increasing the fan speed, and the gas intake per unit time can be increased by increasing the opening of the gas inlet 1141.

[0045] The gas flame detection device is used to detect the combustion flame condition of the burner. The controller is electrically connected to the gas flame detection device, and the controller adjusts the opening of the gas inlet 1141 and the speed of the fan according to the flame detection signal provided by the gas flame detection device.

[0046] The gas flame detection device can be a device for performing spectral analysis on the gas combustion flame, or a device for performing image analysis on the gas combustion flame. It can be understood that the above is only exemplary and is not a limitation of the embodiments of the present invention. Any device that can detect the gas combustion characteristics is within the protection scope of the present invention.

[0047] Since the gas flame detection device can detect the combustion condition in real time according to the combustion characteristics of the flame, and send the flame combustion condition to the controller in real time, the opening size of the gas inlet 1141 and the speed of the fan can be adjusted in real time to increase or decrease the intake amount of gas or air. In this way, when the gas source environment of the gas equipment 100 changes, the gas premixing pipe 10 can also mix a better mixed gas of air and gas to obtain the best air-fuel ratio.

[0048] For example, when a fault occurs in the gas equipment 100, such as a fan failure, the controller can issue an instruction to close the opening of the gas inlet 1141, thereby preventing gas leakage and improving the safety of the operation of the gas equipment 100; under the same load conditions, when the combustion flame detection device detects that the flame image color is reddish or yellowish, it indicates that there is insufficient oxygen, and the controller can issue an instruction to increase the fan speed, thereby increasing the air intake.

[0049] Therefore, according to the gas equipment 100 of the embodiment of the present invention, the combustion flame condition of the burner is monitored in real time by the gas flame detection device, and the controller adjusts the opening size of the gas inlet 1141 and the speed of the fan according to the flame signal fed back by the gas flame detection device, thereby ensuring that the gas equipment 100 can obtain a better air-fuel ratio under different gas source conditions, achieve a stable load regulation ratio, and reduce exhaust gas emissions.

[0050] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the mixing section 114 is divided into a first throat section 1142 and a second throat section 1143 which are independent of each other. The first throat section 1142 and the second throat section 1143 respectively correspond to different gas inlet ports 1141. The inlet of the first throat section 1142 is connected to the contraction section 113, the outlet of the first throat section 1142 is connected to the diffusion section 115, the outlet of the second throat section 1143 is connected to the diffusion section 115, and the inlet of the second throat section 1143 can be selectively connected to the contraction section 113.

[0051] The flow mode of the airflow in the gas premixing tube 10 is roughly as follows: when the second throat section 1143 is not connected to the contraction section 113, and the first throat section 1142 is connected to the contraction section 113, air enters the contraction section 113 from the air inlet 111, and when the air flows to the first throat section 1142, negative pressure is formed, and the gas is injected into the air flow channel 11. In this case, the intake amount of air and gas is small, and the gas equipment 100 is in a small load working state; when the second throat section 1143 is connected to the contraction section 113, and the first throat section 1142 and the second throat section 1143 are both connected to the contraction section 113, air enters the contraction section 113 from the air inlet 111, and when the air flows to the first throat section 1142 and the second throat section 1143, negative pressure is formed, and the gas is injected into the air flow channel 11. In this case, the intake amount of air and gas is large, and the gas equipment 100 is in a large load working state.

[0052] Regardless of the first throat section 1142 or the second throat section 1143, the opening size of the gas inlet 1141 can be adjusted, thereby increasing the load regulation ratio of the gas device 100 and improving the user's comfort.

[0053] In some optional embodiments, Figure 1 and Figure 2 As shown, a sealed gas chamber 21 is formed on the outer periphery of the gas premixing tube 10, and the gas chamber 21 is connected to the gas supply device. That is, the gas chamber 21 acts as a temporary gas storage, so that the gas supply device can first deliver the gas to the gas chamber 21, and when negative pressure appears in the gas flow channel 11, the gas is drawn from the gas chamber 21 into the gas flow channel 11 to mix with the air.

[0054] In a further optional embodiment, the gas chamber 21 is an annular chamber 20, one end of the annular chamber 20 is sealedly connected to the inlet end 1131 of the contraction section 113, and the other end of the annular chamber 20 is sealedly connected to the outlet end 1151 of the diffusion section 115. That is, the gas chamber 21 is entirely surrounded by the outer periphery of the gas premixing tube 10, so that the forming position of the gas inlet 1141 can be set in one of the mixing section 114, the contraction section 113 and the diffusion section 115. For example, a part of the gas inlet 1141 can be distributed in the mixing section 114, and the other part can be distributed in the contraction section 113 or the diffusion section 115. The multiple choices of the forming positions of the gas inlet 1141 can enable the gas device 100 to select different gas intake methods at different load stages, which is more conducive to obtaining a stable air-fuel ratio and ensuring normal and stable combustion of the burner.

[0055] The gas chamber 21 and the gas premixing pipe 10 may be independent components, and seamlessly connected by welding.

[0056] In some other optional embodiments of the present invention, a baffle 1144 that can be selectively opened is provided on the side of the second throat section 1143 facing the contraction section 113. Figure 2 and Figure 3 As shown, the baffle 1144 is substantially parallel to the cross section of the air flow channel 11, and plays a role in blocking air from entering the second throat section 1143. In other words, when the load of the gas device 100 is low, the baffle 1144 may not be opened, and at this time, the opening of the gas inlet 1141 corresponding to the second throat section 1143 is also closed. When the load of the gas device 100 is high, the baffle 1144 is opened, and at this time, the opening of the gas inlet 1141 corresponding to the second throat section 1143 is also opened. In this way, the gas device 100 can obtain a better air-fuel ratio under any operating conditions.

[0057] Furthermore, the baffle 1144 may be a one-way conducting device that opens only to one side. When the speed of the fan is relatively high, the baffle 1144 moves in the air outlet direction under the action of air pressure, thereby conducting the contraction section 113 and the second throat section 1143. That is, the baffle 1144 opens adaptively as the wind pressure increases, and the gas inlet 1141 corresponding to the second throat section 1143 also opens accordingly.

[0058] Advantageously, the opening and closing degree of the baffle 1144 is positively correlated with the opening of the gas inlet 1141 corresponding to the second throat section 1143. In this way, the unit intake volume of air and gas can be increased or decreased synchronously.

[0059] In other embodiments of the present invention, Figure 1-Figure 3 Combination Figure 4As shown, the gas premixing pipe 10 further includes: a damper 116 and a driving device 117, and the driving device 117 drives the damper 116 to open or close the gas inlet 1141. That is, when the controller receives the flame signal from the gas flame detection device, it can control the driving device 117 to open or close the gas inlet 1141, thereby regulating the unit intake volume of air and gas.

[0060] In an optional embodiment, the driving device 117 is a stepper motor, and the stepper motor is connected to the controller. The stroke of the stepper motor is controlled by the flame combustion signal to obtain the best air-fuel ratio.

[0061] In other embodiments of the present invention, the gas device further comprises: a solenoid valve, the valve plug of the solenoid valve is arranged opposite to the gas inlet 1141, and the opening size of the gas inlet 1141 is controlled by the displacement of the valve plug of the solenoid valve. The magnitude of the magnetic field force generated by the solenoid valve is proportional to the displacement of the valve plug. For example, the magnetic field force can be adjusted by controlling the magnitude of the coil current input to the solenoid valve, thereby controlling the displacement of the valve plug, thereby effectively adjusting the opening size of the gas inlet 1141, and ensuring that the gas premixing pipe 10 has a better air-fuel ratio.

[0062] In the description of the present invention, it is necessary to understand that the terms "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0067] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A gas equipment, characterized in that: include: Burner; A gas premixing tube, the gas premixing tube is used to provide a mixture of gas and air to the burner, the gas premixing tube defines an air flow channel, the air flow channel has an air inlet and an air outlet, and in the direction from the air inlet to the air outlet, the air flow channel is divided into a contraction section with a gradually decreasing cross section, a mixing section with a constant cross section, and a diffusion section with a gradually increasing cross section, and the gas premixing tube has a gas inlet that runs through the wall thickness; A gas supply device, the gas supply device being connected to the gas inlet; A fan, the fan is in communication with the air flow channel and is used to drive the gas to flow from the air inlet to the air outlet; A gas flame detection device, the gas flame detection device is used to detect the combustion flame condition of the burner; A controller, the controller being electrically connected to the gas flame detection device and the fan respectively, and the controller regulating the opening of the gas inlet and the rotation speed of the fan according to a flame detection signal provided by the gas flame detection device; The mixing section is divided into a first throat section and a second throat section which are independent of each other; A selectively openable baffle is provided on the side of the second throat section facing the contraction section; The opening degree of the baffle is positively correlated with the opening of the gas inlet corresponding to the second throat section; The baffle is a one-way conducting device.

2. The gas equipment according to claim 1, characterized in that: The first throat section and the second throat section correspond to different gas inlets respectively, the inlet of the first throat section is connected to the contraction section, the outlet of the first throat section is connected to the diffusion section, the outlet of the second throat section is connected to the diffusion section, and the inlet of the second throat section can be selectively connected to the contraction section.

3. The gas equipment according to any one of claims 1-2, characterized in that: A sealed gas cavity is formed on the outer periphery of the gas premixing pipe, and the gas cavity is connected to the gas supply device.

4. The gas equipment according to claim 3, characterized in that: The combustion gas chamber is an annular chamber, one end of which is sealedly connected to the inlet end of the contraction section, and the other end of which is sealedly connected to the outlet end of the diffusion section.

5. The gas equipment according to claim 1, characterized in that: The gas chamber is built in the air flow channel.

6. The gas equipment according to claim 1, characterized in that: The gas premixing pipe further comprises: a damper and a driving device, wherein the driving device drives the damper to open or close the gas inlet.

7. The gas equipment according to claim 6, characterized in that: The driving device is a stepping motor, and the stepping motor is connected to the controller.

8. The gas equipment according to claim 1, characterized in that: The gas equipment further comprises: a solenoid valve, wherein a valve plug of the solenoid valve is arranged opposite to the gas inlet, and the opening size of the gas inlet is controlled by the displacement of the valve plug of the solenoid valve.

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