An energy-saving burner and gas stove with improved thermal efficiency

Abstract

This utility model discloses an energy-saving burner and gas stove with improved thermal efficiency. The energy-saving burner includes a main combustion chamber assembly, which includes a main combustion chamber and a premixing chamber. Gas and air are fully mixed in the premixing chamber to form a uniform combustible gas before entering the main combustion chamber for combustion. The burner also includes a secondary combustion chamber assembly, which includes a secondary combustion chamber and a secondary air supply chamber. The secondary combustion chamber is located radially outside the top of the main combustion chamber and is connected to the main combustion chamber. The secondary air supply chamber supplies air to the secondary combustion chamber. The exhaust gas generated by the combustion in the main combustion chamber enters the secondary combustion chamber and is subjected to secondary combustion in the secondary combustion chamber.

Description

Technical Field

[0001] This utility model belongs to the field of gas stove technology. Background Technology

[0002] Currently, the thermal efficiency of commercial stove burners on the market is generally between 25% and 35%. To improve thermal efficiency, existing technologies typically employ premixed burners, which involve a premixing chamber where gas and air are thoroughly mixed to form a homogeneous combustible gas before entering the combustion chamber for combustion. Although some premixed burners can achieve thermal efficiencies of around 40%, their energy-saving effect is still insufficient to cope with the current economic downturn. The catering industry is currently facing multiple pressures, including low menu prices, meager profits, high labor costs, and high operating expenses. Gas costs typically account for 3% to 1.8% of revenue; therefore, further improving thermal efficiency is essential to meet the market's demand for energy conservation and cost reduction. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide an energy-saving burner and gas stove with improved thermal efficiency, thereby further improving thermal efficiency.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] First, an energy-saving burner with improved thermal efficiency is provided, including a main combustion chamber assembly. The main combustion chamber assembly includes a main combustion chamber and a premixing chamber. The fuel gas and air are fully mixed in the premixing chamber to form a uniform combustible gas before entering the main combustion chamber for combustion. The burner also includes a secondary combustion chamber assembly, which includes a secondary combustion chamber and a secondary air supply chamber. The secondary combustion chamber is located radially outside the top of the main combustion chamber and is connected to the main combustion chamber. The secondary air supply chamber supplies air to the secondary combustion chamber. The exhaust gas generated by the combustion in the main combustion chamber enters the secondary combustion chamber and is subjected to secondary combustion in the secondary combustion chamber.

[0006] Preferably, the secondary combustion chamber includes an inner wall located radially inward and a top wall connected to the top of the inner wall and extending obliquely outward in a radial direction, wherein the inner wall and the top wall are provided with secondary combustion holes.

[0007] Preferably, the premixing chamber is located below the main combustion chamber, the top of the premixing chamber is provided with a premixing plate, and a seam is provided between the premixing plate and the inner wall of the top of the premixing chamber.

[0008] Preferably, a pressure-bearing backfire prevention plate is provided below the main combustion chamber, and the pressure-bearing backfire prevention plate is located above the premixing plate, and a negative pressure chamber is provided between the pressure-bearing backfire prevention plate and the premixing plate.

[0009] Preferably, the main combustion chamber assembly further includes a main combustion fan supplying air to the main combustion chamber and a main combustion pipe supplying gas to the main combustion chamber, the main combustion pipe being provided with a gas nozzle; and / or, a small combustion chamber is provided on the radially outer side of the main combustion chamber, the small combustion chamber being connected to a small combustion fan.

[0010] Preferably, the main combustion chamber assembly further includes a temperature sensor for detecting the temperature of the main combustion chamber, so as to provide data compensation for combustion control by combining the temperature data fed back by the temperature sensor.

[0011] Preferably, a main fire air supply pipe is provided between the main fire blower and the main fire combustion chamber. The main fire air supply pipe includes a vertical section, and the main fire pipe is located in the vertical section. At least three main fire angle adjustment rods are connected to the vertical section along the circumferential thread. The main fire angle adjustment rods are located below the gas nozzle.

[0012] Preferably, the top of the main combustion chamber is provided with a flame-shaped sealing ring and an infrared ring, and the flame-shaped sealing ring and the infrared ring are provided with multiple connecting pieces distributed circumferentially, and oxygen supplementation holes are provided between adjacent connecting pieces.

[0013] Preferably, the upper part of the burner is provided with an annular heat insulation zone along the circumference.

[0014] In addition, a gas stove is also provided, which is equipped with the aforementioned burner.

[0015] The technical solution adopted in this utility model has the following beneficial effects:

[0016] 1. The main combustion chamber assembly is a conventional premixed burner, with an additional secondary combustion chamber assembly. This secondary combustion chamber assembly includes a secondary combustion chamber and a secondary air supply chamber. The secondary air supply chamber provides oxygen to the secondary combustion chamber to promote combustion of the exhaust gases. The exhaust gases from the main combustion chamber are discharged through the secondary combustion chamber, where they undergo secondary combustion. The high temperature in the secondary combustion chamber generates infrared heat radiation, further improving thermal efficiency.

[0017] 2. The secondary combustion chamber includes an inner wall located radially inward and a top wall connected to the top of the inner wall and extending obliquely outward radially. Both the inner wall and the top wall are provided with secondary combustion holes. The exhaust gas after combustion is discharged to the outside through the secondary combustion holes and simultaneously undergoes secondary combustion in the upper layer, allowing the upper layer to generate infrared heat radiation after reaching high temperature, thereby improving thermal efficiency.

[0018] 3. The premixing chamber is located below the main combustion chamber, and a premixing plate is provided on the top of the premixing chamber. A seam is provided between the premixing plate and the inner wall of the top of the premixing chamber. The premixing plate has the function of stabilizing flow and pressure. The mixed gas flows and is pressure-stabilized through the seam of the premixing plate and enters the main combustion chamber for stable combustion.

[0019] 4. Because a pressure-bearing anti-backfire plate is installed below the main combustion chamber, backfire and whistling can be prevented.

[0020] 5. A small fire chamber is provided on the radial outer side of the main combustion chamber. The small fire chamber is connected to a small fire fan. It adopts a side-type small fire combustion chamber. The small fire chamber performs small fire combustion to ignite the main combustion chamber.

[0021] 6. The main combustion chamber assembly also includes a temperature sensor for detecting the temperature of the main combustion chamber. Combined with the temperature data fed back by the temperature sensor, necessary data compensation can be provided for combustion control. Specifically, the temperature sensor feeds back the temperature to the main control board, which controls combustion according to the pre-set temperature curve (corresponding air-fuel ratio). This control board can adjust both the air intake volume and the air intake volume. The air intake volume is controlled by controlling the main combustion fan, while the air intake volume is controlled by controlling the proportional valve connected to the main combustion tube, thereby promoting combustion and improving thermal efficiency.

[0022] 7. A main fire air supply pipe is provided between the main fire blower and the main fire combustion chamber. The main fire air supply pipe includes a vertical section. The main fire pipe is located in the vertical section. At least three main fire angle adjustment rods are connected to the vertical section along the circumferential thread. The combustion surface is balanced by adjusting the main fire angle adjustment rods.

[0023] 8. The top of the main combustion chamber is provided with a flame-shaped closing ring and an infrared ring, which are used to generate infrared thermal radiation to improve thermal efficiency and to form an ignition diamond.

[0024] 9. The upper part of the burner is provided with an annular heat insulation zone along the circumference, which can isolate the heat transfer between the burner and the stove surface and the furnace.

[0025] The specific technical solution adopted by this utility model and its beneficial effects will be disclosed in detail in the following specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] Figure 1 This is a top view of the burner in this utility model;

[0028] Figure 2 for Figure 1 Sectional view of AA;

[0029] Figure 3 This is a side view of the burner in this utility model;

[0030] Figure 4 for Figure 3 CC section view;

[0031] In the diagram: 1. Secondary make-up air pipe; 2. Small flame air supply pipe; 3. Small flame fan; 4. Main flame pipe; 5. Main flame angle adjustment rod; 6. Premix plate; 7. Pressure-bearing anti-backfire plate; 8. Premix chamber; 9. Negative pressure chamber; 10. Insulation zone; 11. Secondary make-up air chamber; 12. Secondary combustion chamber; 121. Top wall; 122. Inner side wall; 123. Secondary combustion flame hole; 13. Flame pattern sealing ring and infrared ring; 14. Small flame chamber; 15. Main flame combustion chamber; 16. Temperature sensor; 17. Main flame fan; 18. Small flame angle adjustment rod; 19. Positioning adjustment rod; 20. Main flame air supply pipe; 21. Vertical section; 22. Gas nozzle. Detailed Implementation

[0032] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0033] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0034] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. In the description of this invention, it should be understood that terms such as "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] like Figures 1 to 4 As shown, an energy-saving burner with improved thermal efficiency is available for commercial stoves and can also be used in household stoves. It includes a main combustion chamber assembly, which comprises a main combustion chamber 15 and a premixing chamber 8. Gas and air are thoroughly mixed in the premixing chamber 8 to form a uniform combustible gas before entering the main combustion chamber 15 for combustion. The main combustion chamber employs a flat-plate combustion burner, a type of burner capable of generating infrared radiation combustion, as is currently available. Additionally, the burner includes a secondary combustion chamber assembly, which comprises a secondary combustion chamber 12 and a secondary air supply chamber 11. This secondary combustion chamber provides oxygen to aid combustion, promotes secondary combustion, reduces carbon monoxide emissions, and generates infrared thermal radiation to improve thermal efficiency. The secondary combustion chamber 12 is located radially outward above the top of the main combustion chamber and is connected to the main combustion chamber 15. The secondary air supply chamber 11 is located below the secondary combustion chamber and is connected to the secondary combustion chamber 12. The secondary air supply chamber replenishes air to the secondary combustion chamber. The exhaust gas produced by the main combustion chamber enters the secondary combustion chamber, where it undergoes secondary combustion. This process generates infrared heat radiation at high temperatures, improving thermal efficiency.

[0039] The secondary combustion chamber 12 includes an inner wall 122 located radially inward and a top wall 121 connected to the top of the inner wall and extending obliquely outward radially. Both the inner wall and the top wall are provided with secondary combustion vents 123. The exhaust gas after combustion is discharged through the secondary combustion vents and simultaneously undergoes secondary combustion in the upper layer, allowing the high temperature in the upper layer to generate infrared heat radiation, thereby improving thermal efficiency.

[0040] Specifically, the premixing chamber 8 is located below the main combustion chamber 15, and a premixing plate 6 is provided on the top of the premixing chamber 8. A slit is provided between the premixing plate 6 and the inner wall of the top of the premixing chamber. The premixing plate has the functions of stabilizing flow and pressure. The mixed gas flows through the slit of the premixing plate with stable flow and pressure, and enters the main combustion chamber for stable combustion. The width of the slit is maintained between 1.5 mm and 5 mm. If the slit width is too small, the airflow will not be smooth enough; if it is too large, the function of stabilizing flow and pressure will be difficult to achieve.

[0041] To prevent backfire and howling, a pressure-bearing backfire prevention plate 7 is installed below the main combustion chamber. The pressure-bearing backfire prevention plate 7 has a top wall and side walls, with the bottom surface of the side walls contacting the premixed plate 6, thus forming a negative pressure chamber 9 between the pressure-bearing backfire prevention plate 7 and the premixed plate 6. The pressure-bearing backfire prevention plate maintains a distance of 4mm to 12mm from the bottom of the main combustion chamber, and the area of ​​the pressure-bearing backfire prevention plate is larger than the combustion area of ​​the main combustion chamber. Furthermore, a positioning adjustment rod 19 is provided between the premixed plate 6 and the pressure-bearing backfire prevention plate 7. The positioning adjustment rod is a screw rod, and a positioning screw hole post is provided below the premixed plate 6. The positioning adjustment rod 19 passes through the premixed plate 6 and connects to the positioning screw hole post, fixing the pressure-bearing backfire prevention plate 7 in place.

[0042] In order to deliver air and gas into the premixing chamber, the main combustion chamber assembly also includes a main combustion fan 17 that supplies air to the main combustion chamber 15 and a main combustion pipe 4 that supplies gas to the main combustion chamber. The main combustion pipe 4 is equipped with a gas nozzle 22. Therefore, the gas ejected from the gas nozzle and the air delivered by the main combustion fan 17 are fully mixed in the premixing chamber 8.

[0043] In some embodiments, a small fire chamber 14 is provided radially outside the main combustion chamber. The small fire chamber 14 is connected to a small fire fan 3, and a small fire air supply pipe 2 is provided between the small fire fan 3 and the small fire chamber 14. A side-type small fire chamber is used, equipped with a waterproof pressure-reducing cover, an ignition needle, and a flame sensing device. The small fire chamber ignites the main combustion chamber with a small flame.

[0044] In addition, the secondary air supply chamber 11 is connected to a secondary air supply pipe 1, which can be connected to the smoldering air supply pipe 2, so that both the secondary air supply chamber 11 and the lower fire chamber 14 are supplied with air and oxygen by the smoldering fan 3. The smoldering air supply pipe 2 is connected with at least three smoldering angle adjustment rods 18 along the circumferential thread, which are also used to adjust the balance of the combustion surface.

[0045] Furthermore, the radial inner wall of the secondary air supply chamber is provided with many small ventilation holes that communicate with the main combustion chamber. In this way, the air delivered by the small fire blower passes through the ventilation holes of the secondary air supply chamber to supplement oxygen to the main combustion chamber, ensuring that the main combustion chamber will not be extinguished due to lack of oxygen even if the pot body is pressed tightly.

[0046] In some embodiments, the main combustion chamber assembly further includes a temperature sensor 16 for detecting the temperature of the main combustion chamber. Combined with the temperature data fed back by the temperature sensor, necessary data compensation can be provided for combustion control. Specifically, the temperature sensor feeds back the temperature to the main control board, which controls combustion according to a pre-set temperature curve (corresponding air-fuel ratio). This control board can adjust both the air intake and air intake volume. The air intake volume is controlled by controlling the main combustion fan, while the air intake volume is controlled by controlling a proportional valve connected to the main combustion tube, thereby promoting combustion and improving thermal efficiency. The temperature sensor can be a common thermocouple, which can be inserted into the main combustion chamber to directly measure the temperature inside, offering advantages such as fast thermal response time and high measurement accuracy.

[0047] In some embodiments, the top of the main combustion chamber is provided with a flame-shaped sealing ring and an infrared ring 13 to generate infrared thermal radiation, improve thermal efficiency, and form an ignition diamond. The flame-shaped sealing ring and infrared ring 13 have multiple connecting pieces distributed circumferentially, and oxygen-enhancing holes are provided between adjacent connecting pieces; these holes can be triangular or circular. Adjacent connecting pieces are fixed by perforated metal wires or metal sheets, and the materials used are high-temperature resistant and oxidation-resistant materials such as Cr20Ni50, Cr20Ni80, and Cr20Ni35.

[0048] The main fire blower 17 is provided with a main fire air supply pipe 20 between the main fire blower 17 and the main fire combustion chamber 15. The main fire air supply pipe 20 includes a vertical section 21. The main fire pipe 4 is located in the vertical section. At least three main fire angle adjustment rods 5 are connected to the vertical section 21 circumferentially. The three main fire angle adjustment rods 5 are evenly distributed circumferentially and are perpendicular to the vertical section. They can be adjusted radially along the vertical section. The main fire angle adjustment rods are located below the gas nozzle and are used to adjust the balance of the combustion surface.

[0049] Furthermore, the upper part of the burner is provided with an annular heat insulation zone 10 along the circumference. This zone is used to isolate the heat transfer between the burner and the cooktop and the furnace. The internal insulation medium is air or heat insulation material.

[0050] This embodiment uses the above-mentioned technical solution to further improve thermal efficiency, which can achieve a thermal efficiency of over 60%, thereby reducing the proportion of gas costs for catering enterprises to 1% and directly increasing net profit by 1% to 2%.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An energy-saving burner with improved thermal efficiency, comprising a main combustion chamber assembly, wherein the main combustion chamber assembly includes a main combustion chamber and a premixing chamber, wherein fuel gas and air are fully mixed in the premixing chamber to form a homogeneous combustible gas before entering the main combustion chamber for combustion, characterized in that, The burner also includes a secondary combustion chamber assembly, which includes a secondary combustion chamber and a secondary air supply chamber. The secondary combustion chamber is located radially outside the top of the main combustion chamber and is connected to the main combustion chamber. The secondary air supply chamber supplies air to the secondary combustion chamber. The exhaust gas generated by the combustion in the main combustion chamber enters the secondary combustion chamber and is subjected to secondary combustion in the secondary combustion chamber.

2. The energy-saving burner with improved thermal efficiency according to claim 1, characterized in that, The secondary combustion chamber includes an inner wall located radially inward and a top wall connected to the top of the inner wall and extending obliquely outward radially. Both the inner wall and the top wall are provided with secondary combustion holes.

3. The energy-saving burner with improved thermal efficiency according to claim 1, characterized in that, The premixing chamber is located below the main combustion chamber, and a premixing plate is provided on the top of the premixing chamber. A seam is provided between the premixing plate and the inner wall of the top of the premixing chamber.

4. An energy-saving burner with improved thermal efficiency according to claim 3, characterized in that, A pressure-bearing anti-backfire plate is provided below the main combustion chamber, and the pressure-bearing anti-backfire plate is located above the premixing plate. A negative pressure chamber is provided between the pressure-bearing anti-backfire plate and the premixing plate.

5. An energy-saving burner with improved thermal efficiency according to claim 1, characterized in that, The main combustion chamber assembly further includes a main combustion fan that supplies air to the main combustion chamber and a main combustion pipe that supplies gas to the main combustion chamber, the main combustion pipe being equipped with a gas nozzle; and / or, a small combustion chamber is provided on the radially outer side of the main combustion chamber, the small combustion chamber being connected to a small combustion fan.

6. An energy-saving burner with improved thermal efficiency according to claim 5, characterized in that, The main combustion chamber assembly also includes a temperature sensor for detecting the temperature of the main combustion chamber, so as to provide data compensation for combustion control by combining the temperature data fed back by the temperature sensor.

7. An energy-saving burner with improved thermal efficiency according to claim 5, characterized in that, A main fire air supply pipe is provided between the main fire blower and the main fire combustion chamber. The main fire air supply pipe includes a vertical section, and the main fire pipe is located in the vertical section. At least three main fire angle adjustment rods are connected to the vertical section along the circumferential thread. The main fire angle adjustment rods are located below the gas nozzle.

8. An energy-saving burner with improved thermal efficiency according to claim 1, characterized in that, The top of the main combustion chamber is provided with a flame-shaped sealing ring and an infrared ring. The flame-shaped sealing ring and the infrared ring are provided with multiple connecting pieces distributed circumferentially, and oxygen supplementation holes are provided between adjacent connecting pieces.

9. An energy-saving burner with improved thermal efficiency according to claim 1, characterized in that, The upper part of the burner is provided with an annular heat insulation zone along the circumference.

10. A gas stove, characterized in that, The gas stove is equipped with a burner as described in any one of claims 1 to 9.

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