A gas premixing structure, a burner and a premixed gas water heater

Abstract

The present invention discloses a gas premixing structure, a burner and a premixed gas water heater. Among them, the gas premixing structure includes a premixing pipeline that can be inserted into both a gas input pipe and an air input pipe at the same time, and a preset number of through holes are provided on the surface of the premixing pipeline; a spiral expansion structure centered on the premixing pipeline and rotating outward is provided outside the premixing pipeline. The gas premixing structure and the burner provided by the present invention have a simple structure, can replace a fully premixed fan, play a role in fully mixing, making the combustion temperature uniform, and improving the thermal efficiency.

Description

Technical Field

[0001] The present invention relates to the field of gas water heaters, in particular to a gas premixing structure, a burner and a premixed gas water heater. Background Art

[0002] Gas water heaters have become an indispensable kitchen appliance in modern homes, and maximum heat load is a key performance metric. Currently, most water heater manufacturers use conventional atmospheric burners, which heat the water through primary and secondary mixing of air and gas, combustion within the burner, and heat exchange with cold water via a heat exchanger. However, traditional fully premixed gas water heaters require a fully premixed fan, which presents drawbacks of complex structure and high cost. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a gas premixing structure, a burner and a premixed gas water heater, which have a simple structure and can replace a full premixing fan, thereby achieving full mixing, uniform combustion temperature and improved thermal efficiency.

[0004] A gas premixing structure, characterized by comprising a premixing pipe capable of being simultaneously inserted into a gas inlet pipe and an air inlet pipe, wherein a predetermined number of through holes are provided on the surface of the premixing pipe; and a spiral expansion structure centered on the premixing pipe and rotating outward is provided on the periphery of the premixing pipe;

[0005] Optionally, the through holes are evenly arranged;

[0006] Optionally, the curling width of the spiral expansion structure is equivalent to the length of the premixing pipe;

[0007] Optionally, the center of the spiral expansion structure is welded or clamped to the premixing pipe.

[0008] A gas premix burner, characterized by comprising the above-mentioned gas premix structure; a cylindrical metal wire mesh layer is sheathed on the periphery of the spiral expansion structure;

[0009] Optionally, a preset number of small holes are provided on the surface of the metal mesh layer;

[0010] Optionally, the small holes are evenly distributed on the surface of the metal mesh layer;

[0011] Optionally, the metal mesh layer has a cylindrical structure.

[0012] A premix gas water heater is characterized by comprising the above-mentioned gas premix burner, a smoke exhaust pipe connected to the gas premix burner, and a water coil surrounding the gas premix burner.

[0013] In the gas premixing structure, burner and premixed gas water heater provided by the present invention, during use, gas and air respectively enter the premixing pipeline from the gas input pipe and the air input pipe, and are preliminarily premixed in the pipeline; the premixed gas is discharged through the through holes on the surface of the pipeline, and a swirling mixing effect is formed when passing through the spiral expansion structure to achieve uniform mixing of gas and air; the uniformly mixed gas burns after passing through the metal wire mesh layer with through holes, and the heat generated by combustion can be taken away by the water coil around the burner. At the same time, the tail gas generated by combustion is discharged through the smoke exhaust pipe connected to the burner.

[0014] Compared with the traditional premixing scheme using a full-premixing fan, the gas premixing structure and burner provided by the present invention have a simple structure. The combination of the premixing pipeline and the spiral expansion structure can replace the full-premixing fan, achieving a sufficient and uniform mixing effect, which is beneficial to improving the combustion efficiency; compared with the traditional premixed gas water heater, it overcomes the problems of inconvenient installation and high cost of the full-premixing fan. Description of the Drawings

[0015] Figure 1 is a perspective view of the gas premixing structure in an embodiment of the present invention;

[0016] Figure 2 is a partially enlarged view of the gas premixing structure in an embodiment of the present invention;

[0017] Figure 3 is a structural diagram of the gas premixed burner in an embodiment of the present invention;

[0018] Figure 4 is a schematic structural diagram of heat discharge when the gas premixed burner in an embodiment of the present invention is working;

[0019] Figure 5 is a schematic structural diagram of tail gas discharge when the gas premixed burner in an embodiment of the present invention is working;

[0020] The reference signs in the accompanying drawings of the specification are as follows:

[0021] 1. Gas input pipe; 2. Air input pipe; 3. Premixing pipeline; 31. Through hole; 4. Spiral expansion structure; 5. Metal wire mesh layer; 51. Through hole; 6. Water coil; 7. Smoke exhaust pipe. Detailed Embodiments

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] A gas premixing structure, such as Figure 1 、2 As shown in the figure, it includes a premixing pipeline 3 that can simultaneously insert a gas input pipe 1 and an air input pipe 2. The surface of the premixing pipeline 3 is provided with a preset number of through holes 31; a spiral expansion structure 4 centered on the premixing pipeline 3 and rotating outward is provided outside the premixing pipeline 3.

[0024] Among them, the premixing pipeline is a cavity with through holes, which is used to accommodate the gas entering from the gas input pipe and the air entering from the air input pipe; the through holes are used to discharge the mixed gas; the spiral expansion structure rotates outward centered on the premixing pipeline, and is used to make the premixed gas gradually diffuse outward along the spiral structure and achieve the purpose of full mixing.

[0025] Preferably, the through holes on the premixing pipeline are evenly arranged, which is beneficial to improving the premixing effect; the width of the curled edge of the spiral expansion structure is equivalent to the length of the premixing pipeline, that is, the spiral expansion structure fully covers the premixing pipeline. The matching of the two can ensure the full mixing of the gas, and it grows or shortens with the length of the premixing pipeline to meet the needs of the actual water heater size.

[0026] Specifically, the center of the spiral expansion structure and the premixing pipeline can be fixed by welding or clamping, but it is not limited to this specific method.

[0027] A gas premixing burner, as Figure 3 shown in the figure, includes the gas premixing structure as described above, and a metal wire mesh layer 5 is sleeved outside the spiral expansion structure.

[0028] Among them, the mixed gas passes through the metal wire mesh layer and burns on the outer surface of the metal wire mesh layer.

[0029] Preferably, the surface of the metal wire mesh layer is provided with a preset number of small holes 51, and the small holes are evenly arranged on the surface of the metal wire mesh layer to facilitate the mixed gas to penetrate from the outlet of the spiral expansion structure to the surface of the metal wire mesh layer.

[0030] Furthermore, the metal wire mesh layer preferably adopts a cylindrical structure to cover the spiral expansion structure.

[0031] A premixed gas water heater, on the basis of including the above-mentioned gas premixing burner, is further provided with an exhaust pipe 7 connected to the gas premixing burner, and a water circuit coil 6 surrounding the gas premixing burner. Among them, the exhaust pipe 7 is connected to the other end of the premixing pipeline and is arranged opposite to the gas input pipe and the air input pipe, and is used to discharge the tail gas during combustion; the water circuit coil 6 is arranged around the gas premixing burner and is used to take away the heat during combustion through the flow of cold water in the coil. The schematic diagram of the heat and tail gas emission during the operation of the premixed gas water heater is as Figure 4 、 5 shown in the figure.

[0032] Specifically, the working process of the premixed gas water heater is as follows: Gas and air enter the premixing pipeline 3 through the gas input pipe 1 and the air input pipe 2 respectively, and are preliminarily premixed inside the pipeline. The premixed gas is discharged through the through holes 31 around the pipeline; the preliminarily premixed gas after discharge flows into the spiral expansion structure 4, and through the rotational mixing of the spiral expansion structure, uniform mixing of gas and air is achieved and diffuses outward along the spiral expansion structure until it passes through the wire mesh layer 5, and combustion occurs on the outer surface of the wire mesh layer; the heat generated by combustion is carried away by the water coil 6 on its periphery, and the generated tail gas is discharged through the tail end exhaust pipe 7.

[0033] The above is an elaboration of the gas premixing structure and burner of the present invention to help understand the present invention; however, the implementation mode of the present invention is not limited by the above embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A gas premixing structure, characterized in that, It includes a premixing pipeline capable of simultaneously inserting a gas input pipe and an air input pipe, and a preset number of through holes are provided on the surface of the premixing pipeline; a spiral expansion structure centered on the premixing pipeline and rotating outwards is provided outside the premixing pipeline; the through holes are evenly arranged; the curled edge width of the spiral expansion structure is equivalent to the length of the premixing pipeline.

2. The gas premixing structure according to claim 1, characterized in that, The center of the spiral expansion structure is welded or clamped to the premixing pipeline.

3. A gas premixed burner, characterized in that, It includes the gas premixing structure as described in claim 1 or 2; a metal wire mesh layer is sleeved outside the spiral expansion structure.

4. The gas premixed burner according to claim 3, characterized in that, A preset number of small holes are provided on the surface of the metal wire mesh layer.

5. The gas premixed burner according to claim 4, characterized in that, The small holes are evenly arranged on the surface of the metal wire mesh layer.

6. The gas premixed burner according to any one of claims 3 to 5, characterized in that, The metal wire mesh layer has a cylindrical structure.

7. A premixed gas water heater, characterized in that, It includes the gas premixing burner as described in any one of claims 3 to 5, an exhaust pipe connected to the gas premixing burner, and a water coil surrounding the gas premixing burner.

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