Premixer with high regulation ratio and energy-saving and environment-friendly water heater
By improving the premixer structure and the design of the regulating baffle, the problem of unreasonable gas-air mixing ratio was solved, achieving combustion stability and energy saving, and improving temperature control accuracy and user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU DEVOTION HOME ENVIRONMENT TECH CO LTD
- Filing Date
- 2025-04-15
- Publication Date
- 2026-05-15
AI Technical Summary
The existing premixed gas-air mixing ratio is unreasonable, resulting in incomplete combustion. It is prone to flameout or deflagration, especially under low or high load conditions. It has a small adjustment range, poor gas source adaptability, and high bathing temperature in summer, resulting in a poor user experience.
A premixer with a high adjustment ratio is designed. By improving the structure of the adjustable air intake channel, the direct air intake channel, the gas intake channel, and the premixing chamber, and in conjunction with the adjustment baffle, the intake volume of air and gas can be dynamically adjusted to adapt to different gas sources, thereby improving the adjustment range of the combustion ratio and the accuracy of temperature control.
It achieves stable combustion and energy saving under different load conditions, making bathing more comfortable in summer, adapting to various gas sources, with a more reasonable combustion ratio and more precise temperature control.
Smart Images
Figure CN224246206U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of premixer technology, specifically to a premixer with a high adjustment ratio and an energy-saving and environmentally friendly hot water boiler. Background Technology
[0002] A fully premixed gas-fired heating and hot water boiler uses a fan to create negative pressure within a premixer before combustion, drawing air from inside the boiler into the premixer. Simultaneously, a gas proportioning valve opens, allowing gas to enter the premixer, thus achieving complete premixing of gas and air in a specific ratio. Fully premixed burners, unrestricted by mixing time and space, offer advantages such as rapid combustion, complete combustion, low nitrogen oxide emissions, and low noise, leading to their increasing use, especially in condensing water heaters and condensing boilers.
[0003] Currently, premixers have the following drawbacks: 1. The gas-air mixing ratio is unreasonable, resulting in incomplete combustion, especially when operating at full load or low load, which can easily lead to flameout or deflagration, resulting in unstable combustion; 2. Existing premixers have a small adjustment range and relatively high low-fire power, resulting in higher bathing temperatures in summer and relatively poor comfort, greatly reducing the user experience; 3. Existing premixers have poor adaptability to gas sources. Since different gas sources have different Wobbe numbers, current hot water boilers require replacing the premixer or related accessories according to different gas sources, which undoubtedly increases the production costs for enterprises.
[0004] In the prior art, a premixer adaptable to multiple gas sources is disclosed. It is equipped with two gas passages, two air passages, two adjustment devices, and two baffles. According to different fan power, the baffles are pushed open to adjust the air intake volume to reach the range of adjustable air volume. Then, the adjustment device is further improved to adapt to different gas sources. However, in the above technology, because professionals need to manually adjust the two adjustment devices and make multiple adjustments according to the gas source, the suitable air-fuel ratio can be achieved. At the same time, by setting two baffles, it is easy to cause the two baffles to not be pushed open well at the same time when the fan power is low, so the adjustment range of the premixer is not high, and the problem of high bathing temperature still exists in summer. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a premixer with a high adjustment ratio to solve the aforementioned traditional problems.
[0006] The second objective of this utility model is to provide an energy-saving and environmentally friendly hot water boiler that uses this high-adjustment-ratio premixer.
[0007] One of the objectives of this utility model is achieved through the following technical solution:
[0008] A premixer with a high adjustability includes a housing, an air inlet, an adjustable air inlet channel, a direct air inlet channel, a premixing chamber, a gas inlet, and an adjusting baffle. The adjustable air inlet channel and the direct air inlet channel are both connected to the air inlet. The adjustable air inlet channel has a gas inlet channel that communicates with the gas inlet. The gas inlet channel has a gas inlet regulating port that opens toward the premixing chamber. The adjusting baffle is used to adjust the gas flow area of the adjustable air inlet channel and the gas inlet regulating port.
[0009] Preferably, the premixing chamber is arranged to gradually increase in size from the gas flow direction.
[0010] Preferably, the gas intake channel is located in the middle of the adjustable air intake channel, and the gas intake channel divides the adjustable air intake channel into two air intake chambers.
[0011] Preferably, the air intake port is crescent-shaped, and the gas intake regulating port is gradually increased in size from bottom to top.
[0012] Preferably, the ratio of the gas flow area of the adjustable air intake channel to the gas flow area of the gas intake regulating port is (5-10):1.
[0013] Preferably, the air intake passage is located above and / or below the gas intake passage.
[0014] Preferably, the inner diameter of the air inlet channel is 0.05-0.12 times the maximum inner diameter of the premixing chamber.
[0015] Preferably, the adjustable air intake channel is provided with a mounting position, and the adjusting baffle includes a mounting part, a flipping part and an air blocking part. The mounting part is installed on the mounting position by bolts. The flipping part is provided with flipping grooves on opposite sides. The air blocking part is a silicone baffle. The air blocking part is provided with an arc-shaped notch and a vent hole. The vent hole is connected to the adjustable air intake channel.
[0016] Preferably, the adjustable air intake channel is provided with a mounting position, and the adjusting baffle includes a mounting part, a flipping part and an air blocking part. The mounting part is installed on the mounting position by bolts, the flipping part is a hinge, the air blocking part is a silicone baffle, and the air blocking part is provided with an arc-shaped notch and a vent hole. The vent hole is connected to the adjustable air intake channel.
[0017] The second objective of this utility model is achieved by the following technical solution:
[0018] An energy-saving and environmentally friendly hot water boiler includes the aforementioned high-adjustment-ratio premixer.
[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0020] This utility model's premixer improves the structure of the adjustable air intake channel, the direct air intake channel, the gas intake channel, and the premixing chamber. Combined with the function of the adjusting baffle, the adjusting baffle can dynamically adjust the intake volume of air and gas according to the pressure difference in the chamber. Premixing takes place in the premixing chamber, allowing the water heater to adopt a more reasonable combustion ratio, a wider adjustment range for the simmering flame, and adaptability to different gas sources. Temperature control is more precise, making bathing more comfortable in summer. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the air inlet end of the premixer of this utility model;
[0022] Figure 2 for Figure 1 The diagram shows the structure of the premixer's outlet, where the regulating baffle is in the closed state.
[0023] Figure 3 for Figure 1 The diagram shows the first cross-sectional structure of the premixer.
[0024] Figure 4 for Figure 1 The diagram shows the second cross-sectional structure of the premixer.
[0025] Figure 5 for Figure 1 The diagram shows the third cross-section of the premixer, where arrows indicate the flow directions of air and fuel gas, and the baffle is in a half-open state.
[0026] Figure 6 for Figure 1 The diagram shows the third cross-sectional structure of the premixer, where the adjusting baffle is fully open;
[0027] Figure 7 for Figure 2 The diagram shows the structure of the adjusting baffle.
[0028] Figure 8 for Figure 7 The side view of the adjustable baffle shown.
[0029] In the diagram: 10. Housing; 11. Air inlet; 12. Adjustable air intake channel; 13. Straight air intake channel; 14. Premixing chamber; 15. Gas inlet; 16. Gas intake channel; 160. Gas intake regulating port; 20. Regulating baffle; 21. Mounting part; 22. Flipping part; 23. Air blocking part; 230. Arc-shaped notch; 231. Vent hole. Detailed Implementation
[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0031] In the description of this utility model, it should be understood that 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. Therefore, 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, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0032] In the description of this utility model, it should be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.
[0033] Please see Figures 1-8 This invention relates to a preferred embodiment of a high-adjustment-ratio premixer, which is used to premix air and gas in a gas-fired heating and hot water boiler. Specifically, the premixer includes a housing 10, an air inlet 11, an adjustable air inlet channel 12, a direct air inlet channel 13, a premixing chamber 14, a gas inlet 15, and an adjusting baffle 20. The adjustable air inlet channel 12 and the direct air inlet channel 13 are both connected to the air inlet 11. The adjustable air inlet channel 12 is provided with a gas inlet channel 16 connected to the gas inlet 15. The gas inlet channel 16 is provided with a gas inlet regulating port 160 opening toward the premixing chamber 14. The adjusting baffle 20 is used to adjust the gas flow area of the adjustable air inlet channel 12 and the gas inlet regulating port 160.
[0034] The aforementioned premixer improves the structure of the adjustable air intake channel 12, the direct air intake channel 13, the gas intake channel 16, and the premixing chamber 14. Combined with the function of the adjusting baffle 20, the adjusting baffle 20 can dynamically adjust the intake volume of air and gas according to the pressure difference in the chamber. Premixing is carried out in the premixing chamber 14, enabling the water heater to adopt a more reasonable combustion ratio, a wider adjustment ratio for the simmer, and adaptability to different gas sources. Temperature control is more precise, making bathing more comfortable in summer.
[0035] In one embodiment, the main body of the housing 10 is generally funnel-shaped, that is, it is gradually increased in size from the direction of gas flow, which facilitates the uniform mixing of air and gas. The outer end of the housing 10 is provided with several reinforcing ribs to strengthen and fix the structure of the housing 10. The rear end of the housing 10 is provided with a mounting flange with multiple sets of fixing holes, which facilitates the installation of the premixer from different angles and improves the versatility and adjustability of the premixer installation. Preferably, the premixing chamber 14 is arranged to gradually increase in size from the gas flow direction. In this embodiment, the air inlet 11 is located at the front end of the chamber. The air inlet 11 is roughly annular in shape. The addition of the air inlet 11 before the air inlet channel serves as a transition section, allowing the air entering the chamber to transition smoothly and preventing turbulence from forming during the process of surrounding air entering the premixer, which could lead to noise or other sounds. Optionally, the length of the air inlet 11 is 0.05-0.2 of the total length of the housing 10, such as 0.05, 0.08, 0.1, 0.12, 0.15, 0.18, 0.2, etc. The specific total length of the housing 10 can be adjusted according to actual needs, which will not be elaborated here.
[0036] In other embodiments, the inlet of the adjustable air intake channel 12 is funnel-shaped to facilitate airflow. In this embodiment, the gas intake channel 16 is located in the middle of the adjustable air intake channel 12, dividing it into two air intake chambers. These chambers are approximately crescent-shaped, which helps to coordinate with the structure of the gas intake regulating port 160, facilitating the adjustment of the baffle 20 to regulate the intake volume of air and gas. The gas intake regulating port 160 is trapezoidal, gradually increasing in size from bottom to top. This allows the gas to push open the regulating baffle 20 based on gas pressure and pressure difference, thus facilitating the adjustment of the gas intake volume and improving the regulation ratio. Optionally, the ratio of the gas flow area of the adjustable air intake channel 12 to the gas flow area of the gas intake regulating port 160 is (5-10):1, such as 5:1, 5.5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, 10:1, etc.
[0037] In one embodiment, the air direct intake channel 13 is located above and / or below the gas intake channel 16, allowing some air to directly enter the premixing chamber 14 through the air direct intake channel 13. This facilitates the formation of an ejection effect within the premixing chamber 14, making it easier to adjust the pressure difference in the premixing chamber 14 and thus achieving a better adjustment ratio. Optionally, the inner diameter of the air direct intake channel 13 is 0.05-0.12 times the maximum inner diameter of the premixing chamber 14, such as 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, etc. In other embodiments, the position of the air direct intake channel 13 can be adjusted to other positions as needed to better facilitate the ejection effect.
[0038] In this embodiment, the gas inlet 15 is located on one side of the housing 10. The gas inlet 15 is a cylindrical channel, and an annular step is provided at the inner end of the interface of the gas inlet 15. The annular step is used to install a gas flow regulating ring, which can be used to further limit the gas volume and precisely control the gas flow. The structure of the gas flow regulating ring needs to be added according to specific needs, and will not be described in detail here. The outer end of the interface of the gas inlet 15 is provided with a connecting structure, which is a threaded or snap-fit fixing structure. Optionally, such as Figure 4 As shown, in the longitudinal section, the minimum inner diameter of the gas inlet 15 is greater than the width of the gas inlet of the gas inlet channel 16, which is beneficial for adjusting the gas intake volume and intake pressure. Preferably, the minimum inner diameter of the gas inlet 15 is 3-5 times the width of the gas inlet of the gas inlet channel 16, such as 3, 3.5, 4, 4.5, 5, etc.
[0039] In one embodiment, the adjustable air intake channel 12 is provided with a mounting position. The adjusting baffle 20 includes a mounting part 21, a flipping part 22, and an air-blocking part 23. The mounting part 21 is installed on the mounting position by bolts. The flipping part 22 has flipping grooves on opposite sides, so that the air-blocking part 23 can be flipped through the flipping part 22. In this embodiment, the thickness of the flipping part 22 is 0.3-0.5 times the thickness of the air-blocking part 23, such as 0.3, 0.35, 0.4, 0.45, 0.5, etc. The appropriate thickness of the flipping part 22 is conducive to the flipping of the air-blocking part 23, so that it can be changed from the closed state to the open state (partially open - half open - mostly open - fully open, etc.). The air-blocking part 23 is roughly semi-circular in structure and is used to adjust the gas flow area of the adjustable air intake channel 12 and the gas intake regulating port 160. That is, the structure of the air-blocking part 23 is adapted to the overall structure of the adjustable air intake channel 12 and the gas intake regulating port 160 so that it can cover its gas outlet.
[0040] In this embodiment, the air-blocking part 23 is provided with an arc-shaped notch 230 and a vent hole 231. The arc-shaped notch 230 is designed to cooperate with the air direct intake channel 13, so that the air-blocking part 23 can avoid the air direct intake channel 13 during the flipping process, thus preventing the air direct intake channel 13 from affecting the flipping of the air-blocking part 23. The vent hole 231 is connected to the adjustable air intake channel 12, and some air can flow out from the vent hole 231. Combined with the air output from the air direct intake channel 13, it is beneficial to form a better ejection phenomenon in the premixing chamber 14, so as to achieve a better premixing effect. There are two vent holes 231, and the diameter of the vent holes 231 is 0.3-0.5 times the diameter of the air direct intake channel 13, such as 0.3, 0.35, 0.4, 0.45, 0.5, etc.
[0041] Optionally, the air-blocking part 23 is a silicone baffle with the following performance requirements: hardness HA65-75 and weight 2-5g. The materials with a hardness of HA65-75 include thermoplastic elastomers (such as SBS, SEBS, TPV, TPU, EVA, etc.), rubbers (such as natural rubber, styrene-butadiene rubber, cis-butadiene rubber, chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, EPDM rubber, silicone rubber, polyacrylate rubber, etc.), fluorinated polyethylene, polyvinyl chloride, etc. The mounting part 21, the flipping part 22, and the air-blocking part 23 are integrally molded, that is, the mounting part 21, the flipping part 22, etc. are also silicone baffles.
[0042] In one embodiment, when the adjusting baffle 20 is in the closed state, the air intake ratio is 10%, and the area is 29.5 mm². 2 The gas pressure, determined by the opening of the gas valve and the added negative air pressure, pushes open the regulating baffle 20, allowing the gas and air to premix in the premixing chamber 14. When the regulating baffle 20 is fully open, the air intake ratio is 100%, and the area is 301.8 mm². 2The pressure of the gas and air pushes open the regulating baffle 20, making it fully open, so that the air intake regulation ratio can be adjusted between 10% and 100%, which is a large adjustment ratio. At the same time, due to the self-rebound force of the baffle rubber and gravity, the position of the air baffle part 23 is adjusted according to the load. In this embodiment, when the regulating baffle 20 is in the closed state, the gas baffle 23 is also provided with a gas vent that communicates with the gas inlet regulating port 160. That is, the arc-shaped notch 230 extends to a position where it intersects with the gas inlet regulating port 160, so that when the regulating baffle 20 is in the closed state, some gas can flow out from the gas vent and premix with the air coming out from the vent hole 231 and the air direct intake channel 13 in the premixing chamber 14. The ratio of the flow area of the gas vent to the total flow area of the vent hole 231 + the air direct intake channel 13 is 1:(5-10), such as 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, 1:8.5, 1:9, 1:9.5, 1:10, so that it also has a good air-fuel ratio when the regulating baffle 20 is in the closed state. When the regulating baffle 20 is fully open, the ratio of the flow area of the gas intake regulating port 160 to the total flow area of the adjustable air intake channel 12 + the direct air intake channel 13 is 1:(5-10), such as 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, 1:8.5, 1:9, 1:9.5, 1:10. When the regulating baffle 20 is in other positions, the air-fuel ratio of the gas also meets the above requirements, which will not be elaborated here.
[0043] In other embodiments, the flipping part 22 is a hinge. The flipping mechanism allows for rotation. This can be understood as follows: the adjustable air intake channel 12 has a mounting position; the adjusting baffle 20 includes a mounting part 21, a flipping part 22, and an air-blocking part 23. The mounting part 21 is bolted to the mounting position. The flipping part 22 is a hinge, and the air-blocking part 23 is a silicone baffle. The air-blocking part 23 has an arc-shaped notch 230 and a vent hole 231, which communicates with the adjustable air intake channel 12. When the flipping part 22 is a hinge, the performance parameters of the air-blocking part 23 need to be adjusted to match its flipping effect. Specific adjustments are made according to actual needs and will not be elaborated further here.
[0044] The working principle of the above premixer is as follows:
[0045] When the hot water boiler is started, the fan starts according to the power output. When the hot water boiler is running at low speed, due to the low fan speed, the adjusting baffle 20 is closed due to the self-rebound force of the baffle rubber and gravity, blocking the adjustable air intake channel 12 and the gas intake regulating port 160. At this time, air enters the premixing chamber 14 from the air direct intake channel 13, the vent hole 231, etc. The gas valve changes the gas outlet pressure of the gas intake regulating port 160 according to the fan speed, pushing the adjusting baffle 20 to open or flowing out from the gas vent hole, so that the gas and air are fully premixed in the premixing chamber 14. The mixed gas flows into the burner for ignition and combustion under the action of the fan, allowing the hot water boiler to operate at a lower load. As the load of the hot water boiler gradually increases, the pressure difference generated due to the increase in fan speed... The pressure is increased to be sufficiently greater than the self-rebound force of the regulating baffle 20 and gravity, causing it to gradually open. Part of the air and gas flow out from the adjustable air intake channel 12 and the gas intake regulating port 160, respectively, and are then premixed in the premixing chamber 14. When the hot water boiler is running at high heat, the negative pressure generated is relatively large, and the regulating baffle 20 is in a fully open state. The air and gas are mixed at the maximum flow rate, and the hot water boiler operates at maximum load. Because the premixer adopts the above structure, it can adopt a more reasonable combustion ratio, which is more energy-saving and gas-saving in the long term. At the same time, it can also solve the problem of sudden changes in temperature during summer bathing, and control the temperature more accurately. Since the regulating baffle 20 can be dynamically adjusted according to the fan speed, the adjustment range is high to adapt to different gas sources, and it can also improve the combustion stability when running at full load or low load.
[0046] In other embodiments, the present invention also provides an energy-saving and environmentally friendly hot water boiler, which includes the aforementioned high-adjustment-ratio premixer. Through the action of the premixer, the combustion performance of the hot water boiler is more energy-saving and environmentally friendly, and it can also greatly improve the user's satisfaction with bathing.
[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0048] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A premixer with a high turn-off ratio, characterized in that, The device includes a housing, an air inlet, an adjustable air inlet channel, a direct air inlet channel, a premixing chamber, a gas inlet, and an adjusting baffle. The adjustable air inlet channel and the direct air inlet channel are both connected to the air inlet. The adjustable air inlet channel has a gas inlet channel that communicates with the gas inlet. The gas inlet channel has a gas inlet regulating port that opens toward the premixing chamber. The adjusting baffle is used to adjust the gas flow area of the adjustable air inlet channel and the gas inlet regulating port.
2. The premixer with a high adjustment ratio according to claim 1, characterized in that, The premixing chamber is arranged to gradually increase in size from the direction of gas flow.
3. The premixer with a high adjustment ratio according to claim 1, characterized in that, The gas intake channel is located in the middle of the adjustable air intake channel, and the gas intake channel divides the adjustable air intake channel into two air intake chambers.
4. The high-adjustment-ratio premixer according to claim 3, characterized in that, The air intake port is crescent-shaped, and the gas intake regulating port is gradually increased in size from bottom to top.
5. The premixer with a high adjustment ratio according to claim 1, characterized in that, The ratio of the gas flow area of the adjustable air intake channel to the gas flow area of the gas intake regulating port is (5-10):
1.
6. The premixer with a high turn-off ratio according to claim 1, characterized in that, The air intake channel is located above and / or below the gas intake channel.
7. The high-adjustment-ratio premixer according to claim 6, characterized in that, The inner diameter of the direct air intake channel is 0.05-0.12 times the maximum inner diameter of the premixing chamber.
8. The premixer with a high turn-off ratio according to claim 1, characterized in that, The adjustable air intake channel is provided with a mounting position. The adjustment baffle includes a mounting part, a flipping part and an air blocking part. The mounting part is installed on the mounting position by bolts. The flipping part has flipping grooves on opposite sides. The air blocking part is a silicone baffle. The air blocking part has an arc-shaped notch and a vent hole. The vent hole is connected to the adjustable air intake channel.
9. The premixer with a high turn-off ratio according to claim 1, characterized in that, The adjustable air intake channel is provided with a mounting position. The adjusting baffle includes a mounting part, a flipping part and an air blocking part. The mounting part is installed on the mounting position by bolts. The flipping part is a hinge. The air blocking part is a silicone baffle. The air blocking part is provided with an arc-shaped notch and a vent hole. The vent hole is connected to the adjustable air intake channel.
10. An energy-saving and environmentally friendly hot water boiler, characterized in that, Including a premixer with a high turn-off ratio as described in any one of claims 1-9.