Air conditioning structure and positive pressure combustion gas combustion system
By designing an air conditioning structure in the burner, including a primary air intake section and an air adjustment extension section, the air pressure at the burner ejector inlet is increased, solving the problem of insufficient primary air volume in miniaturized gas water heaters and achieving efficient combustion and low CO emissions.
Patent Information
- Application Number
- CN202520292035.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-02-24
AI Technical Summary
In miniaturized downdraft gas water heaters, how can we increase the primary air volume to ensure complete combustion and reduce the content of harmful CO gas, while maintaining the burner's small size advantage?
Design an air conditioning structure including a primary air intake section and an air adjustment extension section, which extends to the air pressure buffer zone of the combustion system, and increases the air pressure at the burner injector inlet through the air adjustment extension section, thereby increasing the primary air volume.
It increases the output power of the burner, reduces the CO content in the flue gas, maintains the burner's small size advantage, and does not require enlarging the air inlet diameter, thus saving energy and protecting the environment.
Smart Images
Figure CN223782854U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a burner technical field especially is related to an air conditioning structure and positive pressure combustion gas combustion system. BACKGROUND
[0002] With the development of gas water heater in China, the requirement of water heater is also higher and higher, and the water heater has the trend of miniaturization and large output. This increases the difficulty of water heater design and production, because in the very small burner space, heat exchanger, fan, proportional valve, burner, controller and other parts need to be configured, so the traditional up-drawing type gas water heater needs to be changed into down-blowing type gas water heater, because the volume of the down-blowing burner is small, the combustion intensity is large, and the volume of the gas water heater can be reduced.
[0003] The atmospheric partial premixing combustion is also called Bunsen combustion, the gas flows through the gas nozzle through the gas nozzle passage assembly, and part of the primary air is sucked into the burner ejector pipe at the same time, the gas and air are fully mixed in the burner ejector pipe, and then the flame is sprayed at the fire hole above the burner to form a flame, and the unburned gas is mixed with secondary air around the fire hole to complete the complete combustion. The part of air sucked into the burner ejector pipe from the nozzle inlet is called primary air, which plays a key role in whether the combustion can achieve complete combustion. When the mixed amount of primary air is insufficient, the gas combustion will appear incomplete combustion phenomenon, the heat of the gas cannot be fully converted into high-temperature flue gas, and the content of harmful gas CO in the flue gas produced by combustion will increase sharply; when the mixed amount of primary air is sufficient, complete combustion can be achieved, the heat of the gas is completely converted into high-temperature flue gas, and the content of CO in the flue gas is extremely low. The air required for combustion is forcibly blown into the combustion system by the fan of the down-blowing type atmospheric combustion system, and the air enters the combustion system and is divided into two ways, one way is called primary air which enters the burner and mixes with the gas fully from the burner ejector pipe, and the other way reaches the surrounding of the burner fire hole through the gap around the burner to assist the combustion of the flame at the burner fire hole. The amount of primary air is generally controlled and adjusted by the air regulating plate arranged at the inlet of the burner ejector pipe, the air regulating plate has a circular hole, the primary air increases with the increase of the hole diameter, and the primary air decreases with the decrease of the hole diameter; because the air pressure of the fan blowing into the combustion system is reduced after entering the air pressure buffer zone of the combustion system, the air pressure to the inlet of the burner ejector pipe is also reduced, which means that the amount of primary air is also reduced, but because the volume of the combustion system is limited, the inlet hole diameter of the ejector pipe cannot be infinitely enlarged. SUMMARY
[0004] The utility model aims at providing an air conditioning structure and positive pressure combustion gas combustion system to increase the amount of primary air.
[0005] The utility model discloses a kind of air conditioning structures, including primary air inlet section and primary air conditioning air extension section.
[0006] The primary air inlet section is provided with a primary air inlet hole corresponding to the suction port of the burner, and the primary air conditioning air extension section is connected perpendicularly to the primary air inlet section and extends to the combustion system wind pressure buffer zone.
[0007] Preferably, the length L of the primary air conditioning air extension section is 30-50mm.
[0008] Preferably, the vertical distance H between the primary air conditioning air extension section and the top plate of the combustion system wind pressure buffer zone provided with the secondary air hole is 0.19-0.25mm.
[0009] Preferably, the primary air inlet section is further provided with a fixing screw hole and a positioning reinforcing rib.
[0010] A positive pressure combustion gas combustion system includes the above air conditioning structure.
[0011] Preferably, the positive pressure combustion gas combustion system further includes a burner, a fan, a gas nozzle passage assembly, a combustion system wind pressure buffer zone.
[0012] The burner, the combustion system wind pressure buffer zone, and the fan are arranged from top to bottom in sequence, the gas nozzle passage assembly is in communication with the suction pipe of the burner and the combustion system wind pressure buffer zone, and the fan is in communication with the combustion system wind pressure buffer zone.
[0013] Further preferably, the gas nozzle passage assembly includes a gas passage and a gas nozzle corresponding to the suction port (i.e., the suction pipe inlet) of the suction pipe, and a gap for primary air flow is left between the gas nozzle and the suction port of the suction pipe.
[0014] Still further preferably, the gas passage is provided with an arc-shaped structure on the side close to the combustion system wind pressure buffer zone, and a gap for primary air flow is left between the gas passage and the combustion system wind pressure buffer zone.
[0015] Further preferably, the fan is in communication with the combustion system wind pressure buffer zone through an air duct, and the air duct is provided with a flared mouth structure on the side close to the combustion system wind pressure buffer zone.
[0016] Further preferably, a water heater tank is provided above the flame and fire hole area at the top of the burner.
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] 1. The air conditioning structure can increase the wind pressure of the inlet part of the burner draft tube, increase the primary air quantity, and reduce the content of harmful gas CO in the generated flue gas;
[0019] 2. The utility model discloses simple structure, need not expand the air inlet aperture of draft tube entrance part and can increase primary air quantity, is favorable to maintaining the advantage of small size of down blast burner;
[0020] 3. The utility model discloses a positive pressure combustion gas burner enhanced primary air conditioning plate, which can improve the output power of the down blast gas water heater burner and reduce waste gas emission.
[0021] 4. The utility model discloses an improved primary air conditioning plate structure, which is provided with an extension section. The air volume of the fan is affected by the extension section after entering the wind pressure buffer zone of the combustion system. Part of the air volume is directly folded to the inlet part of the burner draft tube, so that the wind pressure of the inlet part of the burner draft tube is increased, the primary air quantity is increased, no additional power is needed, and energy saving and environmental protection are achieved. BRIEF DESCRIPTION OF DRAWINGS
[0022] Fig. 1 It is the working principle diagram of the air conditioning structure of the utility model;
[0023] Fig. 2 It is the front view of the air conditioning structure of the utility model;
[0024] Fig. 3 It is the side view of the air conditioning structure of the utility model;
[0025] Fig. 4 It is the key size schematic diagram of the air conditioning structure of the utility model;
[0026] Fig. 5 It is the working principle diagram of the air conditioning plate of the comparative example 1;
[0027] Fig. 6 It is the front view of the air conditioning plate of the comparative example 1;
[0028] Fig. 7 It is the side view of the air conditioning plate of the comparative example 1;
[0029] In the figure: 1-air conditioning structure, 11-primary air inlet section, 111-primary air inlet hole, 112-fixing screw hole, 113-positioning reinforcing rib, 12-primary air conditioning extension section, 2-burner, 21-ejector pipe, 22-flame and flame port area, 3-fan, 4-gas nozzle passage assembly, 41-gas passage, 42-gas nozzle, 5-burner system wind pressure buffer zone, 51-burner system wind pressure buffer zone top plate, 6-original primary air conditioning plate, 61-original conditioning plate body, 62-original primary air inlet hole, 63-original fixing screw hole, 64-original positioning reinforcing rib. DETAILED DESCRIPTION
[0030] The utility model will be explained in detail below in combination with the drawings and specific embodiments. The embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.
[0031] It should be noted that: similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0032] Some embodiments of the utility model will be explained in detail below in combination with the drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
[0033] Embodiment 1
[0034] An air conditioning structure 1, as shown in the figure, comprises a primary air inlet section 11 and a primary air conditioning extension section 12 connected vertically. Figs. 1-3
[0035] Among them, a plurality of primary air inlet holes 111 corresponding to the burner ejector port are arranged on the primary air inlet section 11 at intervals, and the primary air conditioning extension section 12 extends to the burner system wind pressure buffer zone 5.
[0036] The embodiment can improve the wind pressure of the burner ejector port part and increase the primary air volume through the design of the primary air conditioning extension section 12.
[0037] Embodiment 2
[0038] An air conditioning structure 1, as shown in the figure, comprises a primary air inlet section 11 and a primary air conditioning extension section 12 connected vertically. Fig. 4
[0039] And, in the embodiment, the primary air inlet section 11 is further provided with a fixing screw hole 112 and a positioning reinforcing rib 113, and the air conditioning structure 1 is connected and fixed to the side plate of the burner through the fixing screw hole 112.
[0040] The rest is the same as in example 1.
[0041] Example 3
[0042] A positive pressure combustion gas combustion system, comprising the air conditioning structure 1 of example 2, further comprising a burner 2, a fan 3, a gas nozzle passage assembly 4 and a combustion system air pressure buffer zone 5.
[0043] Wherein, the burner 2, the combustion system air pressure buffer zone 5 and the fan 3 are sequentially arranged from top to bottom and communicated, the combustion system air pressure buffer zone 5 is provided with a combustion system air pressure buffer zone top plate 51 at the top, the combustion system air pressure buffer zone top plate 51 is provided with a secondary air hole, the burner 2 comprises an injection pipe 21 and a flame and flame port area 22.
[0044] The gas nozzle passage assembly 4 is arranged beside the gas system air pressure buffer zone 5 and the burner 2, and is located on one side of the inlet of the injection pipe 21, the gas nozzle passage assembly 4 comprises a gas passage 41 and a gas nozzle 42, and the gas passage 41 and the gas nozzle 42 leave a gap for the flow of primary air between the burner 2 and the air conditioning structure 1.
[0045] The working principle of the system of the embodiment is that the fan 3 blows air into the gas system air pressure buffer zone 5, one way of air is directly folded to the inlet part of the injection pipe 21 under the action of the primary air conditioning air extension section 12, so that the wind pressure of the inlet part of the injection pipe 21 increases, and the amount of primary air increases; the other way of air enters the bottom of the burner 2 through the secondary air hole of the combustion system air pressure buffer zone top plate 51, and reaches the flame hole around the burner 2 through the gap around the burner 2, and assists the combustion of the flame around the flame hole of the burner 2. The gas is sprayed out through the gas passage 41 and the gas nozzle 42, mixed with air through the injection pipe 21, and flows to the flame and flame port area 22, and burns after encountering a naked flame or an electric spark, which can heat the upper water tank.
[0046] Example 4
[0047] The application discloses a positive pressure combustion gas burner enhanced primary air adjusting plate, which is an optimized structure for improving output power and reducing exhaust emission of a down-blast gas water heater burner, is an air adjusting mechanism used in a gas combustion system and can increase the amount of primary air by increasing the air pressure at the inlet of a burner draft tube.
[0048] Specifically, in the embodiment, the air adjusting structure 1 is a straight-angle bent plate with an angle of 90 degrees. The upper primary air inlet hole 111 is aligned with the draft port. The bent part extends to the burner buffer area (the combustion system air pressure buffer 5). The primary air adjusting extension 12 blocks a part of the air inlet cross section entering the gas nozzle passage assembly 4 from the combustion system air pressure buffer area 5, so that the air inlet passage area of the gas nozzle passage assembly 4 is reduced, the air pressure is increased, the flow rate is accelerated, and the problem of air pressure attenuation can be overcome.
[0049] The primary air adjusting extension 12 extending into the combustion system air pressure buffer area 5 is kept at a certain distance from the combustion system air pressure buffer area top plate 51, so as to reduce the problem of insufficient secondary air caused by too small gap between the primary air adjusting extension 12 and the combustion system air pressure buffer area top plate 51.
[0050] The length of the primary air adjusting extension 12 is generally 30-50 mm, too much length will affect the amount of secondary air and cause incomplete combustion, too high carbon monoxide in flue gas, and too little extension length will not achieve the effect of air pressure increase. The vertical distance between the primary air adjusting extension 12 and the combustion system air pressure buffer area top plate 51 is kept between 0.19-0.25 mm.
[0051] Comparative example 1
[0052] A water heater combustion system, such as Fig. 5As shown, first air from the fan suction port into the electric fan 3, air under the action of fan impeller boost, boost after the air from the fan outlet into the burner combustion system wind pressure buffer area 5. In the combustion system wind pressure buffer area 5, boost after the air in the combustion system wind pressure buffer area 5 equalization. A part through the combustion system wind pressure buffer area top plate 51 into the burner 2 bottom, form secondary air. In addition, the remaining part into the cavity of gas nozzle passage assembly 4, with the gas into the burner injection pipe 21, gas and air in the injection pipe 21 through the burner body mixed, into the burner flame and flame hole area (flame and flame hole area 22), in the presence of open fire or electric spark combustion.
[0053] Because the air in the combustion system wind pressure buffer area 5 is not completely uniform, mainly affected by the position of the fan, the distribution of secondary air hole and other factors, so the air regulating plate (the original primary air regulating plate 6) is used to adjust the air volume into the burner injection pipe. That is, according to the height of the flame, the color adjustment of the hole diameter of each hole (the original primary air inlet hole 62) on the corresponding air regulating plate (the original primary air regulating plate 6) to realize the balanced distribution of primary air.
[0054] In the present comparative example, as shown in Figs. 6-7 The air regulating plate includes the original regulating plate body 61 and the original primary air inlet hole 62, the original fixed screw hole 63 and the original positioning reinforcing rib 64 arranged on the original regulating plate body 61.
[0055] As described above, the air after the fan boost will decrease due to the sudden increase in space after entering the combustion system wind pressure buffer area 5, especially after the burner works for a period of time, the temperature of the flame area rises, and the positive pressure of the combustion chamber rises. For the fan 3, the back pressure increases, and the superposition of the two factors will cause the wind volume and wind pressure to decay, affecting normal combustion.
[0056] After using the air regulating structure of the present utility model in the same water heater, the effect is as follows:
[0057] Before use: oxygen content 11.5-12%, carbon monoxide 120-150ppm.
[0058] After use: oxygen content 10.5-11%, carbon monoxide 70-100ppm.
[0059] The air regulating structure of the present utility model has very obvious effect.
[0060] The above description of the embodiments is to facilitate the ordinary skilled in the art to understand and use the utility model. The person skilled in the art can obviously easily make various modifications to these embodiments, and the general principles described herein are applied to other embodiments without the need for creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.
Claims
1. An air conditioning structure characterized by, The air adjusting structure (1) comprises a primary air inlet section (11) and a primary air adjusting extension section (12). The primary air inlet section (11) is provided with a primary air inlet hole (111) corresponding to the injection port of the burner, and the primary air adjusting extension section (12) is vertically connected with the primary air inlet section (11) and extends to the combustion system wind pressure buffer area.
2. The air conditioning structure according to claim 1, characterized by The length of the primary air adjusting extension section (12) is 30-50 mm.
3. The air conditioning structure according to claim 1, characterized by The vertical distance between the primary air adjusting extension section (12) and the top plate of the combustion system wind pressure buffer area provided with the secondary air hole is 0.19-0.25 mm.
4. The air conditioning structure according to claim 1, characterized by The primary air inlet section (11) is further provided with a fixing screw hole (112) and a positioning reinforcing rib (113).
5. A positive pressure combustion gas combustion system characterized by, The air adjusting structure (1) according to any one of claims 1-4.
6. The positive pressure combustion gas-fired combustion system in accordance with claim 5, wherein, The air adjusting structure (1) further comprises a burner (2), a fan (3), a gas nozzle passage assembly (4), and a combustion system wind pressure buffer area (5). The burner (2), the combustion system wind pressure buffer area (5), and the fan (3) are sequentially arranged from top to bottom, the gas nozzle passage assembly (4) is in communication with the injection pipe (21) of the burner (2) and the combustion system wind pressure buffer area (5), and the fan (3) is in communication with the combustion system wind pressure buffer area (5).
7. The positive pressure combustion gas-fired combustion system of claim 6, wherein, The gas nozzle passage assembly (4) comprises a gas passage (41) and a gas nozzle (42) corresponding to the injection port of the injection pipe (21), and a gap for primary air flow is left between the gas nozzle (42) and the injection port of the injection pipe (21).
8. The positive pressure combustion gas-fired combustion system of claim 7, wherein, The gas passage (41) is provided with an arc-shaped structure on the side close to the combustion system wind pressure buffer area (5), and a gap for primary air flow is left between the gas passage (41) and the combustion system wind pressure buffer area (5).
9. The positive pressure combustion gas-fired combustion system in accordance with claim 6, wherein, The fan (3) is in communication with the combustion system wind pressure buffer area (5) through an air duct, and the air duct is provided with a flared mouth structure on the side close to the combustion system wind pressure buffer area (5).
10. The positive pressure combustion gas-fired combustion system in accordance with claim 6, wherein, A water heater tank is arranged above the flame and fire hole area (22) of the top of the burner (2).