Venturi premixer with high regulation ratio and energy-saving and environment-friendly water heater thereof

Abstract

This invention discloses a Venturi premixer with a high adjustability ratio and its energy-saving and environmentally friendly hot water boiler. The Venturi premixer includes a premixer body and an adjustment drive assembly. The premixer body has a mixing chamber, an air inlet, an air regulating port, a gas inlet, and a gas regulating port. The adjustment drive assembly includes a drive unit, a connecting shaft, a gas regulating baffle ring, and an air regulating baffle ring. The drive unit is used to drive the gas regulating baffle ring and the air regulating baffle ring to move simultaneously via the connecting shaft, so as to adjust the opening degree of the gas regulating port and the air regulating port respectively. The above-mentioned premixer adopts a mechanical linkage control scheme. By adjusting the drive assembly synchronously controlling the opening degree of the gas regulating baffle ring and the air regulating baffle ring, the gas flow rate of the gas regulating port and the air flow rate of the air regulating port are adapted in real time to ensure that the two always maintain the optimal mixing ratio within the full load range, thus achieving a wider adjustability ratio.

Description

Technical Field

[0001] This invention relates to the field of gas-fired heating and hot water boiler technology, specifically to a Venturi premixer with a high adjustment ratio and its energy-saving and environmentally friendly hot water boiler. Background Technology

[0002] Fully premixed gas-fired heating and hot water boilers are currently a popular choice for energy-saving and environmentally friendly heating and hot water systems. Thanks to their advanced combustion technology, they are increasingly widely used in condensing water heaters and condensing boilers. Their core advantage stems from their unique fully premixed combustion system: before the gas enters the combustion chamber, a high-speed fan creates a negative pressure environment inside the premixer using the Venturi principle, precisely drawing in air from the boiler. Simultaneously, the gas proportioning valve opens, injecting gas into the premixer according to a preset ratio for thorough mixing with air. This "mix before combustion" mode ensures that the gas and air are uniformly and proportionally premixed before entering the burner, fundamentally breaking the limitations of traditional combustion methods on mixing time and space. With the growing awareness of environmental protection and the increasing demands for heating quality, fully premixed gas-fired heating and hot water boilers, with their energy-saving, high-efficiency, environmentally friendly, and low-noise advantages, are gradually becoming the mainstream choice in the heating and hot water equipment market, bringing a green and comfortable heating experience to countless households.

[0003] The existing fully premixed combustion system uses a fan to synchronously adjust the ratio of gas and air and the total flow rate to achieve combustion power control. However, due to the minimum stable flow rate threshold, there is a significant bottleneck in the power adjustment range: (1) When the required power is in the low range, the gas-air premixed gas flow rate is too small, which can easily cause flame pulsation, accidental flameout or incomplete combustion, which not only reduces the reliability of equipment operation, but may also increase the emission of harmful substances; (2) The power adjustment ratio of the current mainstream premixers is generally only 1:5, and the output power under low flame conditions is still too high. When bathing in summer, the inlet water temperature is already high. Excessive low flame power can easily lead to large fluctuations in outlet water temperature and scalding water, which seriously affects the comfort of use. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, one of the objectives of this invention is to provide a Venturi premixer with a high adjustment ratio, solving the aforementioned traditional problems. Without changing the existing pneumatic control logic and hardware (such as regulators and valves), it reduces the effective flow area mechanically, achieving precise control of the gas and air intake ratio under different load conditions. This significantly reduces the minimum stable flow rate while maintaining constant control pressure, ensuring that the hot water boiler always burns at the optimal air-fuel ratio. It can achieve a wider adjustment ratio, and the high load adjustment ratio allows for lower low-fire power, more stable operation, more precise temperature control, more comfortable bathing in summer, and greater energy and gas savings, among other advantages.

[0005] The second objective of this invention is to provide an energy-saving and environmentally friendly hot water boiler that uses this high-adjustment-ratio Venturi premixer.

[0006] One of the objectives of this invention is achieved through the following technical solution: A high-adjustment-ratio Venturi premixer includes a premixer body and an adjustment drive assembly mounted on the premixer body. The premixer body has a mixing chamber, an air inlet, an air conditioning port, a gas inlet, and a gas conditioning port connected to the mixing chamber. The adjustment drive assembly includes a drive unit, a connecting shaft connected to the drive unit, and a gas conditioning baffle and an air conditioning baffle mounted on the connecting shaft. During operation, the drive unit drives the gas conditioning baffle and the air conditioning baffle to move simultaneously via the connecting shaft to adjust the opening degree of the gas conditioning port and the air conditioning port respectively.

[0007] Preferably, the ratio of the inner diameter of the air conditioning port to the inner diameter of the gas conditioning port is (35-40):(9-12), and the ratio of the inner diameter of the air intake port to the inner diameter of the gas intake port is (32-35):(13-18).

[0008] Preferably, the ratio of the inner diameter of the gas regulating port to the inner diameter of the gas inlet is (9-12):(13-14).

[0009] Preferably, the drive unit is one of a stepper motor, a servo motor, a brushless DC motor, a pneumatic piston mechanism, or a hydraulic drive mechanism.

[0010] Preferably, the premixer body is further provided with a small flame gas intake channel and a small flame air intake channel, the small flame gas intake channel being connected to the gas intake port and the mixing chamber respectively, and the small flame air intake channel being connected to the air intake port and the mixing chamber respectively.

[0011] One of the objectives of this invention is also achieved through the following technical solution: A high-tunability Venturi premixer includes a premixer body and an adjustment drive assembly mounted on the premixer body. The premixer body includes a main body portion, a flange plate mounted below the main body portion, a gas distributor bushing mounted in the middle of the main body portion, and a top cover mounted above the main body portion. The main body portion has a mixing chamber, an air inlet, a gas inlet, and a bushing mounting cavity. The flange plate has an air adjustment port, and the air adjustment port has a main air intake channel. The gas distributor bushing is installed in the bushing mounting cavity and has a gas adjustment port and a main gas channel. The adjustment drive assembly includes a drive unit, a connecting shaft connecting the drive unit, a gas adjustment retaining ring and an air adjustment retaining ring mounted on the connecting shaft. The connecting shaft passes through the top cover and the main gas channel and extends to the main air intake channel. The gas adjustment retaining ring is used to adjust the opening of the gas adjustment port, and the air adjustment retaining ring is used to adjust the opening of the air adjustment port.

[0012] Preferably, the main body is further provided with a gas auxiliary air intake regulating port and an adjusting bolt. The gas auxiliary air intake regulating port is located on one side of the bushing mounting cavity, and the adjusting bolt is used to adjust the gas intake volume of the gas auxiliary air intake regulating port. The flange plate is also provided with an air flow limiting ring sleeved on the air regulating port. The air regulating port is provided with an air auxiliary air intake channel communicating with the main air intake channel. The air flow limiting ring is provided with a flow limiting hole. The flow limiting hole cooperates with the air auxiliary air intake channel to adjust the air flow rate.

[0013] Preferably, at least one positioning boss is provided on the outer side of the main air intake channel, and the air flow limiting ring is provided with a positioning notch that engages with the positioning boss.

[0014] Preferably, both the secondary air intake channel and the flow restrictor are elongated structures, and the air intake area of ​​the secondary air intake channel is greater than or equal to the air intake area of ​​the flow restrictor.

[0015] The second objective of this invention is achieved by the following technical solution: An energy-saving and environmentally friendly hot water boiler includes the Venturi premixer with a high adjustment ratio described above.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The Venturi premixer of the present invention adopts a mechanical linkage control scheme. Through the coordinated cooperation of the adjustment drive component, the fan and the gas proportional valve, a precise dynamic ratio of gas and air is achieved. During operation, the adjustment drive component synchronously controls the opening of the gas regulating baffle and the air regulating baffle, respectively, to adapt the gas flow rate at the gas regulating port and the air flow rate at the air regulating port in real time, ensuring that the two always maintain the optimal mixing ratio within the full load range. It can achieve a wider adjustment ratio. The high load adjustment ratio allows for lower low-fire power, more stable operation, more precise temperature control, more comfortable bathing in summer, and more energy-saving and gas-saving advantages.

[0017] 2. Compared with the traditional independent control mode, the Venturi premixer of this invention completely eliminates the response delay and proportioning error caused by independent adjustment of multiple systems, and avoids incomplete combustion or excessive oxygen combustion problems from the root. Under the premise of maintaining stable control pressure, the minimum stable flow rate of the premixer is greatly reduced and the adjustment ratio is significantly widened, which can flexibly adapt to the complex working conditions from low load to high load. This technology not only improves combustion efficiency and reduces harmful gas emissions, but also makes the equipment operation more stable and controllable throughout the process with the high reliability of mechanical linkage, providing a more efficient and stable gas supply solution.

[0018] 3. The Venturi premixer of the present invention also has a better flame mixing ratio by setting a small flame gas inlet channel and a small flame air inlet channel. When the premixer is running at low power, it can directly switch to a smaller aperture gas supply channel. Even under extremely low control pressure, it can obtain sufficient flow rate to maintain flame stability. At the same time, the total flow rate is precisely controlled at a very low level to meet a wider adjustment ratio. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the Venturi premixer of the present invention; Figure 2 for Figure 1 An exploded view of the Venturi premixer shown; Figure 3 for Figure 1 The cross-sectional view of the Venturi premixer shown; Figure 4 for Figure 1 The image shows a bottom view of a Venturi premixer. Figure 5 for Figure 1 The top view of the Venturi premixer shown; Figure 6 for Figure 1 The top view of the premixer body is shown, with the top cover not shown; Figure 7 for Figure 2 An exploded view of the flange plate and air restrictor ring shown; Figure 8 for Figure 3 The diagram shows the gas flow when the gas regulating port and air regulating port are fully open. Figure 9 for Figure 3 The diagram shows the gas flow when the gas regulating port and air regulating port are fully closed. Figure 10 for Figure 1 The diagram shows the combination of the Venturi premixer with the fan, gas proportional valve, burner, and heat exchanger.

[0020] In the diagram: 10. Venturi premixer; 11. Premixer body; 110. Air inlet; 111. Gas inlet; 112. Bushing mounting cavity; 113. Gas auxiliary inlet regulating port; 114. Adjusting bolt; 12. Regulating drive assembly; 120. Drive unit; 121. Connecting shaft; 122. Gas regulating retaining ring; 123. Air regulating retaining ring; 13. Flange plate; 130. Air regulating port; 131. Air flow restricting ring; 132. Air auxiliary inlet channel; 133. Flow restricting hole; 134. Positioning boss; 135. Positioning notch; 136. Countersunk hole; 137. Mounting round hole; 14. Gas distributor bushing; 140. Gas regulating port; 15. Top cover; 20. Fan; 30. Gas proportional valve. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention 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 thorough understanding of the present invention. However, the present invention can be practiced 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 the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this invention, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In the description of this invention, 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.

[0024] Please see Figures 1-10 The Venturi premixer 10, a preferred embodiment of the present invention, is used in an energy-saving and environmentally friendly hot water boiler, such as a gas-fired heating hot water boiler or a gas water heater. It works in conjunction with a fan 20, a gas proportional valve 30, a burner, a heat exchanger, and other equipment to precisely control the gas and air intake ratio under different load conditions. Specifically, the Venturi premixer 10 includes a premixer body 11 and an adjustment drive assembly 12 mounted on the premixer body 11. The premixer body 11 has a mixing chamber, an air inlet 110 connected to the mixing chamber, an air regulating port 130, and a gas... The air inlet 111 and the gas regulating port 140 are included. The regulating drive assembly 12 includes a drive unit 120, a connecting shaft 121 connecting the drive unit 120, a gas regulating baffle ring 122 and an air regulating baffle ring 123 mounted on the connecting shaft 121. During operation, the drive unit 120 is used to drive the gas regulating baffle ring 122 and the air regulating baffle ring 123 to move simultaneously through the connecting shaft 121, so as to adjust the opening of the gas regulating port 140 and the air regulating port 130 respectively, so that the gas and air are premixed in the mixing chamber according to the optimal ratio (or calculated ratio) and then discharged from the gas outlet of the mixing chamber.

[0025] The aforementioned Venturi premixer 10 employs a mechanical linkage control scheme. Through the coordinated operation of the regulating drive component 12, the fan 20, and the gas proportional valve 30, it achieves a precise dynamic ratio of gas and air. During operation, the regulating drive component 12 synchronously controls the opening of the gas regulating baffle ring 122 and the air regulating baffle ring 123, respectively adapting the gas flow rate at the gas regulating port 140 and the air flow rate at the air regulating port 130 in real time, ensuring that the two always maintain the optimal mixing ratio across the entire load range. Compared to the traditional independent control mode, this design completely eliminates the response delay and mixing error caused by independent adjustment of multiple systems, fundamentally avoiding incomplete combustion or excessive oxygen combustion problems. While maintaining stable control pressure, the minimum stable flow rate of the premixer is significantly reduced, and the adjustment ratio is significantly widened, allowing for flexible adaptation to complex operating conditions from low to high loads. This technology not only improves combustion efficiency and reduces harmful gas emissions, but also, thanks to the high reliability of mechanical linkage, makes the equipment operation more stable and controllable throughout the process, providing a more efficient and stable gas supply solution.

[0026] In one embodiment, the coordination scheme of the regulating drive component 12, the fan 20, and the gas proportional valve 30 is as follows: Based on the power requirements and size settings of the hot water boiler, a load-opening curve is pre-stored in the control system. When the controller receives the difference between the user-set temperature (including bathroom temperature and heating temperature) and the actual water temperature, it calculates the target heat output and outputs a PWM signal to adjust the fan speed to the set wind speed. At the same time, the gas proportional valve 30 receives a current signal proportional to the fan speed and adjusts the gas flow. The regulating drive component 12 moves the gas regulating baffle ring 122 and the air regulating baffle ring 123 synchronously to the target position according to the preset load-opening curve. Since the two are fixed on the same axis, the changes in the gas and air channels always maintain the design ratio, ensuring a constant mixing ratio. This achieves the goal of ensuring accurate and stable air-fuel ratio across the entire load range through the control strategy of "gas determined by wind, mechanical linkage, and closed-loop fine adjustment".

[0027] In some embodiments, the ratio of the inner diameter of the air conditioning port 130 to the inner diameter of the gas conditioning port 140 is (35-40):(9-12), such as 35:9, 38:9, 38:10, 40:12, etc., and the ratio of the inner diameter of the air inlet 110 to the inner diameter of the gas inlet 111 is (32-35):(13-18), such as 32:13, 32:14, 34:15, 35:18, etc. Preferably, the ratio of the inner diameter of the gas conditioning port 140 to the inner diameter of the gas inlet 111 is (9-12):(13-14), such as 9:13.4, 9:13.7, 9:14, 10:13, 10:13.5, 12:14, etc., to facilitate the premixing of gas and air based on the Venturi effect. The above ratios need to be configured according to actual needs and structure, and will not be elaborated here.

[0028] In this embodiment, the drive unit 120 is a drive component with a tight needle valve, such as a stepper motor, servo motor, brushless DC motor, pneumatic piston mechanism, or hydraulic drive mechanism, which can adjust the opening degree according to the power setting signal to change the effective cross-sectional area of ​​air, gas, etc.

[0029] In other embodiments, to further broaden the adjustment ratio, the premixer body 11 is also provided with a low-fire gas inlet channel and a low-fire air inlet channel. The low-fire gas inlet channel is connected to the gas inlet 111 and the mixing chamber, respectively, and the low-fire air inlet channel is connected to the air inlet 110 and the mixing chamber, respectively. The two channels work together to achieve precise gas distribution under low-fire conditions. During operation, when the main air regulating port 130 and the gas regulating port 140 are completely closed (i.e., the gas regulating baffle ring 122 is tightly abutting against the gas regulating port 140, and the air regulating baffle ring 123 is tightly fitted against the air regulating port 130, and the main gas passage is completely cut off), the system automatically switches to low-fire gas distribution mode. Air enters the mixing chamber only through the low-fire air inlet channel, and gas enters the mixing chamber only through the low-fire gas inlet channel. The two gases are fully premixed in the mixing chamber, which can accurately match the gas and air volume requirements of the hot water boiler under low-fire conditions. Simultaneously, by adjusting or replacing the effective cross-sectional area of ​​the pilot flame gas intake channel and pilot flame air intake channel, the air-fuel ratio can be flexibly controlled, thereby significantly improving the equipment's adjustment ratio range. When the main line air regulating port 130 and gas regulating port 140 are in the open state (including fully open or partially open), the main line and pilot flame channels will simultaneously receive air: part of the air enters the mixing chamber through the main line air regulating port 130, and the other part is still supplemented through the pilot flame air intake channel; similarly, gas flows in part through the main line gas regulating port 140, and the other part is supplemented through the pilot flame gas intake channel. The dual-path parallel gas distribution mode ensures that the gas and air maintain the optimal mixing ratio throughout the entire operating range from the main flame to the pilot flame, guaranteeing combustion efficiency and further widening the equipment's adjustment ratio range.

[0030] To better illustrate the present invention, specific embodiments are given below, such as... Figures 1-9As shown, a high-adjustment-ratio Venturi premixer 10 includes a premixer body 11 and an adjustment drive assembly 12 mounted on the premixer body 11. The premixer body 11 includes a main body portion, a flange plate 13 mounted below the main body portion, a gas distribution bushing 14 mounted in the middle of the main body portion, and a top cover 15 mounted above the main body portion. The main body portion is provided with a mixing chamber, an air inlet 110, a gas inlet 111, a bushing mounting cavity 112, a gas auxiliary inlet adjustment port 113, and an adjustment bolt 114. An air inlet 110 is located at the lower end of the main body, a gas inlet 111 is located at the upper end of the main body, and a secondary gas inlet regulating port 113 is located on one side of the bushing mounting cavity 112. An adjusting bolt 114 is used to adjust the gas intake volume of the secondary gas inlet regulating port 113. The flange plate 13 is provided with an air regulating port 130 and an air flow limiting ring 131 sleeved outside the air regulating port 130. The air regulating port 130 is provided with a main air intake channel and a secondary air intake channel 132 connected to the main air intake channel. The gas flow limiting ring 131 is provided with a flow limiting hole 133, which cooperates with the secondary air intake channel 132 to regulate the air flow into the mixing chamber or the main air intake channel; the gas distribution bushing 14 is used to install in the bushing mounting cavity 112, and the gas distribution bushing 14 is provided with a gas regulating port 140 and a main gas channel communicating with the secondary gas intake regulating port 113; the top cover 15 is provided with a fixed sealing platform for positioning and adjusting the drive assembly 12, and a shaft sealing ring is installed in the fixed sealing platform, which is beneficial for Axial sealing when the connecting shaft 121 moves up and down; the adjustment drive assembly 12 includes a drive unit 120, a connecting shaft 121 connecting the drive unit 120, a gas regulating baffle ring 122 and an air regulating baffle ring 123 mounted on the connecting shaft 121. The connecting shaft 121 is used to pass through the top cover 15 and the main gas passage and extend to the main air intake passage. The gas regulating baffle ring 122 is used to adjust the opening of the gas regulating port 140, and the air regulating baffle ring 123 is used to adjust the opening of the air regulating port 130.

[0031] In this embodiment, as Figures 1-3 As shown, the air inlet 110 has mounting and fixing interfaces on both sides for installing air guide pipes or other air pipes. The gas inlet 111 has a quick-connect or threaded interface, which is convenient for connecting to the gas pipe. The bushing mounting cavity 112 has a positioning mounting groove. The gas distribution bushing 14 has a positioning post installed on the positioning mounting groove and a vent provided for the corresponding gas auxiliary air inlet regulating port 113. This is convenient for configuring gas distribution bushings 14 and vents of different sizes according to requirements to adjust the gas flow of the main gas passage and the gas auxiliary air inlet regulating port 113. The gas distribution bushing 14 also has a gas sealing groove for fitting O-rings.

[0032] like Figure 2 and Figure 6As shown, the main body is also provided with a threaded mounting port for screwing in the adjusting bolt 114. The adjusting bolt 114 is provided with a bolt sealing groove for fitting an O-ring. One side of the auxiliary gas intake regulating port 113 faces the top cover 15, which facilitates communication with the gas intake port 111. By finely adjusting the screw-in position of the adjusting bolt 114, the intake area of ​​the auxiliary gas intake regulating port 113 can be finely adjusted. For example, when screwed out, the intake area of ​​the auxiliary gas intake regulating port 113 increases, and when screwed in, the intake area of ​​the auxiliary gas intake regulating port 113 decreases. The minimum screw-in position is limited to avoid over-screwing the adjusting bolt 114, which could cause the pilot gas intake channel to fail.

[0033] like Figure 8 and Figure 9 As shown, the air intake direction of the gas inlet 111 is approximately perpendicular to the air intake direction of the air conditioning port 130, and the air intake direction of the air conditioning port 130 is approximately perpendicular to the air intake direction of the air inlet 110. This vertical cross-intake method generates swirling and turbulent flow in the channel, breaking the laminar flow state and facilitating the improvement of mixing speed and uniformity. It is equivalent to the air conditioning port 130 and the air conditioning port 130 being on the same axis. This orientation also facilitates the gas regulating baffle ring 122 and the air regulating baffle ring 123 being on the same adjustment line, making it easier to uniformly adjust the opening of the gas regulating port 140 and the air conditioning port 130.

[0034] like Figure 7 As shown, the air conditioning vent 130 has a roughly funnel-shaped structure along the airflow direction, i.e., a gradually narrowing structure, which facilitates gas entry and reduces gas flow noise. The main air intake channel is roughly cylindrical, allowing for a smooth transition of incoming air and preventing turbulence caused by surrounding air entering, thus avoiding noise. At least one positioning boss 134 is provided on the outer side of the main air intake channel, and the air flow limiting ring 131 has a positioning notch 135 that engages with the positioning boss 134, facilitating the installation of the air flow limiting ring 131. The secondary air intake channel 132 has a roughly elongated, slotted hole structure. The intake area of ​​the secondary air intake channel 132 is greater than or equal to the intake area of ​​the flow limiting hole 133, which is conducive to forming the Venturi effect. The flow limiting hole 133 also has a roughly elongated, slotted hole structure, allowing for the configuration of suitable air intake areas for different power models, facilitating adaptation to different power ranges. Figure 2 As shown, the gas regulating baffle ring 122 is fixedly installed on the connecting shaft 121 by the upper gas baffle ring retaining spring and the lower gas baffle ring retaining spring, so that the gas regulating baffle ring 122 can move up and down smoothly.

[0035] like Figure 3As shown, the lower end of the gas distribution sleeve 14 is provided with a receiving section, and the air conditioning baffle 123 is provided with an upper receiving section and a lower guide section. The receiving section is sleeved on the receiving section, and the guide section is provided with a fixed shaft ring. The fixed shaft ring is fixedly installed on the connecting shaft 121 by the upper and lower retaining springs of the air baffle ring, so that the air conditioning baffle 123 can move up and down smoothly and introduce the gas into different positions of the main air intake channel according to the gas pressure, so that the gas and air can be fully mixed.

[0036] like Figure 4 As shown, the flange plate 13 also has at least three countersunk holes 136, and the main body also has fixing holes and flange sealing grooves corresponding to the countersunk holes 136. A flange sealing ring is installed in the flange sealing groove. The flange plate 13 and the main body can be fixedly connected by bolts, and then sealed by the flange sealing ring. This allows for both fixing and adjustment of the installation direction at a 120° angle according to different needs, facilitating different installation requirements. In other embodiments, the flange plate 13 also has several mounting holes 137, which are evenly distributed. These holes are used to mate with the mounting holes of the fan 20 for installation. Because they are arranged at a certain angle, the installation angle of the entire device can be adjusted as needed, facilitating the installation of the premixer.

[0037] like Figure 5 As shown, the top cover 15 is provided with a flange fixing hole, and the main body is also provided with a flange positioning hole and a top cover sealing groove corresponding to the flange fixing hole. The top cover sealing groove is equipped with a top cover sealing ring. The top cover 15 and the main body can be fixedly connected by bolts, and then the two are sealed by the top cover 15 sealing ring.

[0038] like Figures 1-3 As shown, the adjustment drive assembly 12 also includes a drive assembly mounting base. The drive assembly mounting base is provided with a motor mounting hole corresponding to the flange mounting hole. The drive assembly mounting base, the top cover 15 and the main body can be fixedly connected by bolts, which facilitates the fixed installation of the drive unit 120.

[0039] The working principle of the Venturi premixer 10 is as follows: (1) Highest power mode (high fire mode): Fan 20 is operating at maximum load, gas proportional valve 30 is operating at maximum load, and drive unit 120 drive connecting shaft 121 is at the upper limit stroke. At this time, if Figure 8As shown, the gas regulating baffle 122 is at the highest distance position of the gas regulating port 140, and the air regulating baffle 123 is at the highest distance position of the air regulating port 130. The gas flow area of ​​the gas regulating port 140 is at its maximum (i.e., fully open), allowing the maximum gas flow. The air flow area of ​​the air regulating baffle 123 is at its maximum (i.e., fully open), allowing the maximum air flow, so that the system meets the combustion working state of maximum power.

[0040] (2) Lowest power mode (low fire mode): First mode (excluding low fire gas intake channel and low fire air intake channel): Fan 20 is working at minimum load, gas proportional valve 30 is working at minimum load, drive unit 120 drive connecting shaft 121 is at the lower limit stroke. At this time, gas regulating baffle 122 is at the minimum distance position of gas regulating port 140, air regulating baffle 123 is at the minimum distance position of air regulating port 130, the gas flow area of ​​gas regulating port 140 is at the minimum state, allowing the minimum gas flow, and the air flow area of ​​air regulating port 130 is at the minimum state, allowing the minimum air flow, so that the system meets the minimum power combustion working state.

[0041] The second mode (including a small-fire gas intake channel and a small-fire air intake channel): the fan 20 is operating at minimum load, the gas proportional valve 30 is operating at minimum load, and the drive unit 120 drive connecting shaft 121 is at its lower limit stroke. At this time, if... Figure 9 As shown, the gas regulating baffle ring 122 is attached to the end face of the gas regulating port 140, and the air regulating baffle ring 123 is attached to the end face of the air regulating port 130. The gas flow area of ​​the gas regulating port 140 is in a fully closed state, and the air flow area of ​​the air regulating port 130 is in a fully closed state. Gas flows from the small flame gas intake channel into the main gas channel, and air flows from the small flame air intake channel into the main air intake channel, so that the system meets the minimum power combustion working state.

[0042] (3) Other power modes (between the highest and lowest power): Based on the heat output requirements, calculate the wind speed requirements of the fan 20 and the flow opening requirements of the gas proportional valve 30. Then, based on the preset load-opening curve, obtain the adjustment opening requirements of the adjustment drive component 12. Move the gas adjustment baffle ring 122 and the air adjustment baffle ring 123 to the target position synchronously so that the system meets the combustion working state of the required power.

[0043] 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.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high turndown ratio venturi premixer characterized by, The device includes a premixer body and an adjustment drive assembly mounted on the premixer body. The premixer body has a mixing chamber, an air inlet, an air conditioning port, a gas inlet, and a gas conditioning port connected to the mixing chamber. The adjustment drive assembly includes a drive unit, a connecting shaft connected to the drive unit, a gas conditioning baffle ring and an air conditioning baffle ring mounted on the connecting shaft. During operation, the drive unit is used to drive the gas conditioning baffle ring and the air conditioning baffle ring to move simultaneously via the connecting shaft, so as to adjust the opening degree of the gas conditioning port and the air conditioning port respectively.

2. The high-tuning-ratio Venturi premixer of claim 1, wherein, The ratio of the inner diameter of the air conditioning port to the inner diameter of the gas conditioning port is (35-40):(9-12), and the ratio of the inner diameter of the air intake port to the inner diameter of the gas intake port is (32-35):(13-18).

3. The high-tuning-ratio Venturi premixer of claim 2, wherein, The ratio of the inner diameter of the gas regulating port to the inner diameter of the gas inlet is (9-12):(13-14).

4. The high-adjustment-ratio Venturi premixer according to claim 1, characterized in that, The drive unit is one of the following: stepper motor, servo motor, brushless DC motor, pneumatic piston mechanism, and hydraulic drive mechanism.

5. The high-adjustment-ratio Venturi premixer according to any one of claims 1-4, characterized in that, The premixer body is also provided with a small flame gas intake channel and a small flame air intake channel. The small flame gas intake channel is connected to the gas intake port and the mixing chamber, respectively. The small flame air intake channel is connected to the air intake port and the mixing chamber, respectively.

6. A Venturi premixer with a high turn-off ratio, characterized in that, The device includes a premixer body and an adjustment drive assembly mounted on the premixer body. The premixer body includes a main body section, a flange plate mounted below the main body section, a gas distributor bushing mounted in the middle of the main body section, and a top cover mounted above the main body section. The main body section has a mixing chamber, an air inlet, a gas inlet, and a bushing mounting cavity. The flange plate has an air regulating port, and the air regulating port has a main air intake channel. The gas distributor bushing is used to be installed in the bushing mounting cavity, and the gas distributor bushing has a gas regulating port and a main gas channel. The adjustment drive assembly includes a drive unit, a connecting shaft connecting the drive unit, a gas regulating baffle ring and an air regulating baffle ring mounted on the connecting shaft. The connecting shaft passes through the top cover and the main gas channel and extends to the main air intake channel. The gas regulating baffle ring is used to adjust the opening of the gas regulating port, and the air regulating baffle ring is used to adjust the opening of the air regulating port.

7. The high-adjustment-ratio Venturi premixer according to claim 6, characterized in that, The main body is also provided with a gas auxiliary air intake regulating port and an adjusting bolt. The gas auxiliary air intake regulating port is located on one side of the bushing mounting cavity, and the adjusting bolt is used to adjust the gas intake volume of the gas auxiliary air intake regulating port. The flange plate is also provided with an air flow limiting ring sleeved on the air regulating port. The air regulating port is provided with an air auxiliary air intake channel communicating with the main air intake channel. The air flow limiting ring is provided with a flow limiting hole. The flow limiting hole cooperates with the air auxiliary air intake channel to adjust the air flow rate.

8. The high-adjustment-ratio Venturi premixer according to claim 7, characterized in that, At least one positioning boss is provided on the outer side of the main air intake channel, and the air flow limiting ring is provided with a positioning notch that engages with the positioning boss.

9. The high-adjustment-ratio Venturi premixer according to claim 7, characterized in that, Both the secondary air intake channel and the flow restrictor are elongated structures, and the air intake area of ​​the secondary air intake channel is greater than or equal to the air intake area of ​​the flow restrictor.

10. An energy-saving and environmentally friendly hot water boiler, characterized in that, Including the Venturi premixer with a high turn-off ratio as described in any one of claims 1-9.

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