A full-premixed gas ejection pressurization and distribution cavity integrated structure and application

Abstract

This invention relates to the field of gas combustion equipment technology, and discloses an integrated structure and application of a fully premixed gas ejector pressurization and distribution chamber. The structure includes an ejector distribution chamber body, with an ejector flow channel and a pressure-stabilizing distribution chamber connected internally. The ejector flow channel is sequentially arranged with an inlet section, a flow-limiting section, and a diffusion section along the gas flow direction. The axial length of the diffusion section is more than 15 times the equivalent diameter of the throat of the flow-limiting section, and the equivalent gradually expanding angle of the diffusion section sidewall is no greater than 5°. The pressure-stabilizing distribution chamber is a flat and wide cavity. This invention solves the industry pain points of traditional chambers, such as weak pressurization capacity, poor airtightness, insufficient adaptability to operating conditions, and turbulent airflow in multi-unit assembly. It possesses advantages such as high airtightness, high pressure stability, versatility in multiple scenarios, and good mass production consistency. It fills the technical gap in dedicated ejector distribution chambers for fully premixed micro-positive pressure and high-resistance operating conditions, and is compatible with various types of high-end gas combustion equipment, showing broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of gas combustion equipment technology, specifically to an integrated structure and application of a fully premixed gas ejector pressurization and distribution chamber. Background Technology

[0002] In existing technologies, the ejector and distribution chamber structures of gas combustion equipment are mostly designed for atmospheric combustion conditions with open pressure and low resistance. The overall structural matching logic, airflow design, and pressure stabilization and boosting capabilities are only suitable for conventional open combustion scenarios. The flow channel structure, airflow expansion method, and pressure boosting and stabilization system of conventional ejector chambers are all adapted to the traditional atmospheric combustion requirements of small flow rate and low static pressure. The flow channel configuration is regular and simple, and there are inherent bottlenecks in the upper limit of natural ejection boosting, the ability to stabilize pressure across the entire airflow range, and the ability to deliver large flow rates.

[0003] While some high-flow-rate gas supply chambers exist in the industry, conventional high-flow-rate gas supply chambers generally rely on assembling multiple independent low-flow-rate ejector units to achieve power expansion. A single ejector unit has limited flow capacity, and high-flow-rate output depends entirely on the dense stacking of multiple units. This type of structure is a mature solution adapted to traditional atmospheric pressure open equipment, suitable for its inherent low-resistance atmospheric pressure operating conditions. However, it suffers from a bulky structure, mutual interference between airflows from multiple units, and poor pressure consistency. Crucially, these traditional structures are designed with low-resistance combustion at atmospheric pressure as their core design benchmark, lacking features such as high static pressure boosting, multiple high-resistance adaptations, and closed-loop micro-positive pressure stabilization. Therefore, they are completely unsuitable for special and demanding operating conditions such as ultra-thin plate heat exchangers, long linear gas supply, and closed-loop high-power fully premixed systems.

[0004] Furthermore, existing conventional ejector cavities suffer from severe operational adaptability barriers, and the industry's structural design exhibits a clear technological divide: traditional household natural ejector cavities are only suitable for fanless, normal-pressure air intake conditions, and cannot adapt to blower-assisted high-pressure forced air supply conditions. High-pressure airflow easily leads to fluid anomalies such as uneven airflow pressure, airflow turbulence, uneven premixing ratios, and failure of airflow steady-state; while commercial blower-type ejector cavities can only operate with high-pressure air supply from a blower, losing their natural negative-pressure ejection capability and failing to achieve independent and stable premixed air supply without a blower. Currently, there is no ejector distribution cavity structure on the market that can simultaneously accommodate both fanless natural ejection and blower-assisted forced air supply conditions, resulting in extremely poor equipment adaptability and expandability due to the incompatibility of cavity structures for household, commercial, and industrial equipment.

[0005] Meanwhile, existing conventional ejector cavity flow channels are limited in shape and have a single structural form, which cannot meet multiple requirements such as ultra-thin assembly space, linear and uniform gas supply, and high flow and high pressure stabilization, and is difficult to adapt to the stable gas supply requirements of various complex fully premixed combustion conditions. Summary of the Invention

[0006] Based on the deficiencies in the existing technology, the purpose of this invention is to propose an integrated structure of fully premixed gas ejector pressurization and distribution cavity that meets the requirements of high static pressure boosting and high resistance adaptation. This structure solves the problems of insufficient air intake, insufficient premixing, insufficient air supply pressure, and poor airflow stability under closed high resistance conditions through a low-loss step-by-step pressurization flow channel.

[0007] To achieve the above objectives, the present invention adopts the following technical solution.

[0008] An integrated structure for premixed gas ejector pressurization and distribution chamber includes an ejector channel and a pressure-stabilizing distribution chamber. The ejector channel is divided into an intake section, a flow-limiting section, and a diffusion section along the airflow direction. The axial length of the diffusion section is more than 15 times the equivalent diameter of the throat of the flow-limiting section. The sidewall of the diffusion section gradually widens at an angle not exceeding 5°. The pressure-stabilizing distribution chamber is a flat and wide cavity. When the gas is injected into the intake section, it is drawn in by negative pressure and enters together with the air. The gas and air are mixed in the flow-limiting section. After mixing, a bundle-shaped circular premixed airflow enters the diffusion section for long-distance mixing. After mixing, it enters the pressure-stabilizing distribution chamber. During this process, the airflow gradually extends and widens from a bundle shape to a flat and wide surface flow to achieve high static pressure boosting and high resistance adaptation.

[0009] In a preferred embodiment, the axial length of the diffuser section is 20-80 times the equivalent diameter of the throat of the flow-limiting section, and the sidewall widening angle of the diffuser section is 3°-4°; this range is defined as the optimal value.

[0010] In this invention, the ultra-long, stepwise pressurized and stabilized flow channel structure formed by the intake section, flow limiting section, diffusion section, and pressure stabilizing distribution chamber has excellent resistance to fluctuations in operating conditions. It can effectively reduce the interference of flue gas resistance changes and furnace micro-positive pressure back pressure fluctuations on the ejector's ejection capability during combustion heat exchange, avoid the gas ratio deviation caused by operating condition fluctuations, continuously ensure sufficient ejector intake air volume and constant air-fuel ratio, and ensure the long-term stable and efficient operation of the fully premixed micro-positive pressure closed / semi-closed combustion equipment.

[0011] In this invention, the diffuser section adopts an irregularly shaped, gradually increasing flow channel structure with a circular inlet and a flat, wide rectangular outlet. The equivalent diameter of the diffuser section gradually increases along the airflow direction. This gradually increasing flow channel, with its circular inlet and flat, wide rectangular outlet, achieves progressive deceleration and pressurization of the airflow, transforming it from a bundle-shaped circular intake to a uniform planar exhaust. The outlet cross-section can form a regular rectangle or an equivalent elliptical cross-section, simultaneously achieving both airflow pressurization and flow channel width expansion within a single flow channel structure. This structure can gradually reduce and stabilize the high-speed premixed airflow, resulting in a large flow rate and uniformly distributed exhaust output, perfectly adapting to the gas supply requirements of ultra-long linear gas supply and large-size fully premixed combustion structures. Simultaneously, the flattened and widened flow channel design significantly reduces the overall thickness of traditional high-flow-rate cavities, greatly reducing the equipment stacking height and meeting the structural design requirements of high-power, ultra-thin equipment. It also adapts to the lightweight and thin-assembly requirements of various ultra-thin flat gas equipment. The extended gradient diffuser can effectively increase the premixed gas delivery pressure, so that the gas supply pressure inside the cavity is always higher than the pressure inside the combustion chamber of the equipment, forming a stable pressure difference barrier, which is suitable for the micro-positive pressure conditions of various closed and semi-closed combustion equipment, ensuring the stability of gas supply and combustion.

[0012] This invention provides an integrated structure for a fully premixed gas ejector pressurization and distribution chamber, enabling efficient and uniform premixing of fuel gas and primary air under fanless passive air intake conditions, making it a versatile product for both operating conditions. The invention relies on a uniquely shaped, ultra-long, gradually varying flow channel system, combined with a low-loss, step-by-step pressurization principle with an equivalent diameter expansion angle of less than 5° and a single ejector with a fully stable pressure distribution chamber structure. This achieves stable premixed gas supply under both fanless natural ejection and fan-driven forced airflow conditions, completely breaking down the industry barriers of traditional ejector chambers that are fragmented in operating conditions, limited in application scenarios, and restricted in load.

[0013] In the case of natural ejection without a fan, the ejector distribution chamber integrates an extended diffuser tube to pressurize the ejector flow channel. Relying on the Venturi negative pressure effect, the gas nozzle injects gas and autonomously entrains ambient atmospheric pressure primary air. The gas and air enter the ultra-long gradually changing diffuser flow channel from the intake section and the flow-limiting section. Through step-by-step diffusion, deceleration, pressure stabilization, and pressurization based on a micro-angle with a gradual expansion angle of less than 5° based on the equivalent diameter, the gas and air are fully, homogeneously, and precisely premixed, eliminating airflow turbulence and kinetic energy attenuation. Finally, a high-pressure, uniform, and stable fully premixed gas is formed, which is evenly delivered to each burner hole of the combustion plate through the pressure stabilization distribution chamber. It is suitable for low-noise and stable combustion conditions under full-gradient heat load in household applications.

[0014] Under forced airflow conditions, high-pressure air is forcibly delivered to the intake end by the blower, and the gas nozzle directly injects gas to entrain high-pressure air into the flow channel. Relying on the buffering, flow stabilization, and pressure equalization characteristics of the ultra-long, step-by-step pressure-stabilizing flow channel of this invention, the fluid problems of uneven pressure, turbulence, and imbalance in high-pressure airflow are completely solved, achieving precise premixing and pressure stabilization under high-pressure conditions. It is suitable for commercial and industrial small, medium, and large-scale full-gradient heat loads with high air pressure, large flow rate, and continuous and stable combustion conditions.

[0015] Meanwhile, this invention, through the ultra-long micro-diffusive anti-fluctuation structure design of the ejector channel, can effectively suppress the interference of flue gas resistance changes and furnace micro-positive pressure back pressure fluctuations on the premix ratio during combustion heat exchange, continuously ensuring constant air intake and stable ratio accuracy, thus locking in the stability of air supply under all operating conditions from the core structure; combined with the integrated seamless structure design of the air intake end, the cavity has excellent airtightness, and a stable positive pressure environment can be continuously formed inside, adapting to the harsh combustion conditions of closed / semi-closed high resistance micro-positive pressure, effectively ensuring the stable and efficient operation of the equipment under all operating conditions, all scenarios, and all loads.

[0016] This invention features a unique dual-condition universal adaptation system, an ultra-long diameter ratio boosting and stabilizing flow channel, a round-to-flat and wide-scale expansion structure, and anti-fluctuation and stable mixing ratio core technologies. It perfectly solves the industry pain points of existing technologies, such as single operating conditions, poor adaptability, weak pressure stabilization, insufficient air tightness, and inability to adapt to high-resistance micro-positive pressure conditions. It can comprehensively cover all scenarios of household, commercial, and industrial applications, and all-gradient heat load premixed gas combustion equipment.

[0017] This invention can be directly adapted to various conventional fully premixed combustion plate structures, and is suitable for multiple special and harsh working conditions such as ultra-thin and lightweight, linear gas supply, high load and high pressure, and closed micro-positive pressure. The product has a wide range of applications and strong market expansion. Compared with traditional cavity structures, it has significant technical advantages and market competitiveness, and has extremely high industrial promotion and practical application value.

[0018] In this invention, the equivalent diameter of the air intake section gradually decreases along the airflow direction, a plurality of air inlets are uniformly provided on the side wall of the air intake section, an end cap is installed at the end of the air intake section, and a gas nozzle is installed on the end cap.

[0019] In a preferred embodiment, the ejector channel and the voltage stabilizing distribution cavity constitute the ejector distribution cavity body. The ejector distribution cavity body is formed by aligning and sealing two independent sheet metal stretching parts. Each sheet metal stretching part is respectively formed with the ejector channel half-cavity contour and the voltage stabilizing distribution cavity half-cavity contour. After the two sheet metal stretching parts are sealed and assembled, the corresponding half-cavity contours surround to form an integrated cavity that connects the ejector channel and the voltage stabilizing distribution cavity.

[0020] In this invention, the advantage of using two independent sheet metal stretching parts aligned and sealed together to form the ejector distribution cavity body is that it can be mass-produced using standardized sheet metal stretching, sealing, and pressing processes. The molding process is mature, mass production consistency is high, and the processing steps are simplified, raw material loss is low, and manufacturing costs are controllable, making it highly valuable for industrial mass production. Obviously, those skilled in the art can use other existing or future known molding processes to replace this sheet metal stretching part alignment and sealing assembly process, depending on actual needs, and the number of independent sheet metal stretching parts is not limited to two.

[0021] This invention provides an integrated structure for a fully premixed gas ejector pressurization and distribution cavity. It employs a double-sheet metal part split-section stretching and alignment sealing assembly structure to form three basic regular cavity shapes: a square pressure-stabilizing distribution cavity, a circular pressure-stabilizing distribution cavity, and a slender linear pressure-stabilizing distribution cavity. Combined with derivative shapes such as flat, wide, high-flow-rate, and lateral docking, it constitutes a complete cavity structure system with multiple specifications and adaptability. After the two components are aligned, fastened, and sealed around their perimeter, a complete, sealed, and seamlessly connected ejector-pressure-stabilizing-distribution integrated cavity is formed. This completely avoids the assembly gaps and errors of conventional structures, adapting from the structural source to the high-pressure, high-tightness, and high-flow-rate fully premixed gas supply conditions.

[0022] Based on the stretching and splicing molding process of this invention, various exclusive integrated cavity shapes can be formed, covering two major assembly systems: lateral asymmetric lateral docking and top symmetrical vertical docking. This adapts to the exclusive gas supply conditions of different specifications of fully premixed combustion structures, ultra-thin heat exchange equipment, and linear combustion equipment. All configurations adopt the core logic of a single ejector independent flow channel + integrated molding of the overall full-domain pressure-stabilized chamber inlet end. Unlike traditional equipment that relies on multiple ejector arrays and multi-unit assembly for power output, this method achieves a large-span heat flow output of 2kW to 30kW and highly uniform pressure-stabilized gas supply without the need for multiple unit stacking. It specifically addresses the compatibility gap of existing conventional structures that cannot adapt to ultra-high power, ultra-thin structures, and linear uniform gas supply. Specifically, it is divided into four mainstream application configurations:

[0023] 1. Transverse Single Ejector Integrated Flat Round Cavity Configuration: Adopting a single-sided transverse ejector layout, a single set of ejector channels is horizontally integrated at the side of the integrated cavity. It has a compact structure, small size, and low assembly cost, and is suitable for conventional power closed gas equipment. Compared with the traditional conventional fanless ejector cavity structure, the diffuser section of this integrated configuration relies on the gradual expansion angle of the flow channel based on the equivalent diameter of 3° to 4° and the large-ratio expansion structure of the round-to-flat-wide, which breaks through the upper limit of the flow output of the traditional single ejector structure. At the same time, it achieves a tenfold increase in the outlet length and flow area of ​​the diffuser section, and can obtain a gas delivery flow rate and global pressure stability and uniformity that far exceed those of the traditional single ejector structure. This structure can stably output large flow rate, low flow rate, and high uniformity of premixed gas through a single ejector configuration, completely breaking the industry bottleneck of traditional fanless single ejector structures with narrow load adaptability, single operating conditions, and incompatibility with equipment with full gradient heat load. It can be perfectly adapted to various small load, conventional load, and large load full gradient high heat flux closed premixed combustion equipment for household, commercial, and industrial applications.

[0024] 2. Flat, Wide, High-Flow Lateral Outlet Chamber Configuration: This is the core, high-end, and unique configuration of the invention. It adopts a single ejector arranged centrally or eccentrically, paired with a large-volume, flat, wide, overall pressure-stabilizing and distributing chamber. Utilizing a gradually expanding diffuser with an equivalent flow channel diameter of 3°–4° and a super-large ratio circular-to-flat-wide expansion structure, a single ejector can achieve premixed gas flow and pressure uniformity far exceeding traditional multi-ejector parallel structures. The overall chamber's flattened, wide, and thin design ensures extremely high consistency across the entire gas outlet area, stably outputting uniform high-pressure premixed gas. This provides a solid structural foundation for matching high-power, large-size plate heat exchangers, fully meeting the assembly and stable gas supply requirements of various high-heat-load equipment.

[0025] 3. Top-connected ultra-thin universal configuration: This is a specially optimized configuration adapted to various combustion structures. The overall structure adopts a symmetrical double-stretched component integrated assembly structure, with the inlet and outlet facing the same direction. The top air outlet vertically connects to the external combustion distribution structure. This configuration can flexibly switch design forms according to actual application scenarios, including three basic forms: square cavity, circular cavity, and slender flat linear cavity. The square and circular cavities have regular structures and uniform pressure, suitable for conventional regular combustion conditions. The slender flat linear cavity has an ultra-thin strip shape, relying on the double-stretching process to precisely form a long strip with a gradually wide and flat flow channel. The flow channel uniformly expands and stabilizes pressure along the length direction, which can completely transform the single-beam air intake into a long strip of linear uniform air output. It is specially adapted to ultra-thin vertical plate heat exchange structures and the narrow assembly space and linear air supply requirements of industrial linear flame treatment equipment. The switchable multi-form design solves the shortcomings of traditional cavity forms being single in shape and limited in adaptability to various scenarios. It fills the industry gap of having no adaptable high-power single-unit self-ejection cavity for ultra-thin and ultra-long linear combustion equipment, and greatly improves the flexibility of structural adaptation to various scenarios.

[0026] 4. Compact Lateral Dock Configuration: Utilizing a lateral docking assembly structure, the overall structure is compact, occupies little space, is easy to assemble, and is low-cost, making it suitable for various conventional power closed-circuit gas equipment. In one embodiment, the ejector channel throat diameter is 4.5mm, the diffuser section length-to-diameter ratio is 30, the equivalent micro-diffraction angle is 3.5°, and the flow channel width is uniform / pressure stabilization performance is stable. It can adapt to the full-gradient load gas supply needs of conventional household power equipment and small commercial equipment. Its structure is highly versatile and adaptable, suitable for mass production and standardized manufacturing, and widely compatible with various closed / semi-closed premixed combustion equipment.

[0027] This invention can form various differentiated cavity shapes, such as conventional flat round, square, circular, slender flat linear, and flat wide high flow, through stretching, alignment and sealing splicing processes. These shapes can be precisely adapted to various scenarios, such as general combustion equipment, regular fire grid equipment, ultra-thin vertical plate heat exchange linear structure, and high-power high-load combustion equipment.

[0028] In this invention, the pressure-stabilizing distribution cavity, with its integrated stretch-formed structure, is the core functional section of the air inlet. The complete pressure-stabilizing distribution cavity is formed by the integrated cavity structure and the external combustion plate. The main body of the ejector distribution cavity is a single-ejector full-domain pressure-stabilizing structure, which can be matched to fully premixed gas equipment with a power range of 2kW to 30kW by adjusting its shape, size, and performance parameters. This invention features an innovative adaptive design logic that proportionally matches the ejector flow size, air inlet flow rate, external combustion plate area, and equipment heat load requirements. The aspect ratio, flow channel diffusion ratio, and micro-diffusion gradient angle of each cavity configuration can be adaptively matched according to the equipment's rated power, combustion structure, and assembly space dimensions. It comprehensively covers multiple types of gas combustion equipment for both residential and commercial use, without any exclusive matching structure limitations. It has extremely strong cross-category universal adaptability and technical expansion performance, and can be applied to both fanless natural ejector atmospheric pressure fully premixed gas equipment and fan-driven forced high-pressure premixed gas equipment.

[0029] The present invention, by adopting the above technical solution, has at least the following beneficial effects:

[0030] I. This invention features a unique ultra-large aspect ratio pressurized ejector channel structure. This pressurized ejector channel structure limits the effective length of the diffuser section to more than 15 times the throat diameter. Combined with a micro-diffraction structure with a gradually expanding included angle based on the equivalent diameter of the channel not exceeding 5°, it forms a low-loss, step-by-step pressurization channel. This enables the premixed gas to smoothly and step-by-step decelerate, stabilize, and pressurize, effectively eliminating the kinetic energy attenuation caused by high-speed airflow turbulence. Compared with traditional short diffuser section structures, it can increase the premixed gas output static pressure, stable pressure range, and effective delivery flow rate by several to tens of times, completely solving the core problems of insufficient air intake, inadequate premixing, insufficient gas supply pressure, and poor airflow stability under closed high-resistance conditions.

[0031] II. This invention, through precise optimization of the ejector channel profile and flow structure, effectively reduces kinetic energy attenuation caused by airflow turbulence and disturbances, achieving stable and balanced deceleration and pressure stabilization of the premixed gas. Simultaneously, by gradually transitioning from a circular inlet to a wide, flat outlet in the diffuser section, it continues the core feature of optimal equivalent micro-diffraction based on a 3°–4° gradually expanding angle of the equivalent diameter of the channel. This composite structure, with its gradually narrowing guide zone and large-scale axial expansion length, achieves efficient deceleration and pressurization while uniformly and smoothly delivering the premixed gas to the long distribution chamber. This structure effectively reduces the overall volume occupied by the distribution chamber, significantly increases the static pressure of the premixed gas inside the distribution chamber, and is suitable for fully premixed micro-positive pressure closed combustion gas supply environments. It also effectively solves the industry adaptation problem of traditional ejector distribution structures being difficult to adapt to ultra-thin combustion structures, plate heat exchange structures, and long linear combustion heat exchange structures, thus meeting multiple application requirements such as high load, high pressure stability, ultra-thin design, and linear uniform gas supply.

[0032] Third, the innovative structure of this invention achieves a dual technological breakthrough from two dimensions: industrial mass production and end-user application. At the industrial mass production level, the integrated molding process of independent stretching and alignment sealing of two parts results in high molding precision, simplified assembly procedures, low raw material loss, and excellent consistency in batch production, which can effectively reduce processing and manufacturing costs and improve mass production efficiency. At the end-user application level, this invention, while ensuring ultra-large flow output, uniform and stable gas supply across the entire range, and adaptability to various high-resistance micro-positive pressure working conditions, greatly reduces the space occupied by equipment installation. It perfectly adapts to the design requirements of ultra-thin, lightweight, and high-heat-load high-end gas equipment, and effectively fills the industry technology gap of lacking a high-power single-unit self-inhaling injection cavity for ultra-thin plate heat exchange equipment and linear flame treatment equipment, significantly improving the product's cross-scenario adaptability and core market competitiveness.

[0033] IV. Dual-condition universal adaptation, breaking industry scenario barriers and extremely strong versatility: This invention has created a unique dual-condition compatible flow channel structure, breaking through the industry's technical bias that the traditional ejection cavity can only be adapted to single conditions with or without a fan. It achieves universal adaptation for both natural ejection without a fan and forced blowing with a fan in fully premixed conditions, which is the first of its kind in the industry. The fanless mode is suitable for household equipment with full-gradient heat load. It relies on the Venturi negative pressure effect to naturally entrain atmospheric air to complete precise premixing. It operates with low noise and stability, requires no fan maintenance, and has lower energy consumption. The fan-equipped mode is suitable for commercial and industrial equipment with full-gradient heat load. It can weaken the negative pressure air intake effect of the ejector horn and directly entrain high-pressure air into the flow channel through the gas nozzle to complete homogeneous premixing. It relies on the ultra-long step-by-step pressure stabilizing flow channel to buffer high-pressure airflow and suppress airflow turbulence, so as to achieve high-pressure stable premixed gas supply under all working conditions of low load, normal load, and high load. It fully covers the application scenarios of all types of household, commercial, and industrial gas equipment with full-gradient heat load. The degree of structural universality and cross-scenario adaptability of the product far exceeds that of the traditional single-condition cavity structure.

[0034] V. Full-range high-pressure stable gas supply, resistance to operating condition fluctuations, and precise assurance of premixed gas supply stability: This invention, relying on the optimal equivalent micro-diffusive gradient flow channel and ultra-long pressurizing flow channel structure, can achieve gradual and stable pressurization and uniform flow distribution of premixed gas, significantly improving the upper limit of gas supply pressure and flow rate under closed high-resistance conditions. It completely solves the problems of insufficient premixing, insufficient gas supply pressure, gas pressure decay under full-gradient heat load conditions, and poor airflow stability in traditional structures. Simultaneously, this invention possesses excellent resistance fluctuation suppression capabilities, effectively reducing the interference of flue gas flow resistance changes and furnace micro-positive back pressure fluctuations on the premixed gas ratio concentration during combustion heat exchange. It avoids gas ratio deviation problems caused by operating condition fluctuations, continuously ensuring sufficient and constant ejector gas volume, and stably maintaining a high-precision fully premixed ratio. From the core structure, it locks in the stability and consistency of ejector gas supply performance, providing a stable, uniform, and high-pressure high-quality gas source for various fully premixed micro-positive pressure combustion equipment, ensuring long-term efficient and stable operation of the equipment. Attached Figure Description

[0035] Figure 1 The diagram shown is a schematic diagram of the integrated structure of the fully premixed gas ejector pressurization and distribution cavity provided in Embodiment 1 of the present invention.

[0036] Figure 2 As shown Figure 1 A diagram from another perspective.

[0037] Figure 3 The diagram shown is an assembly schematic of the ejector distribution cavity body of Embodiment 1.

[0038] Figure 4 As shown Figure 1 The structure explodes.

[0039] Figure 5 The diagram shown is a schematic of the gradually expanding included angle in Example 1.

[0040] Figure 6 The diagram shown is a schematic diagram of the integrated structure of the fully premixed gas ejector pressurization and distribution cavity provided in Embodiment 2 of the present invention.

[0041] Figure 7 As shown Figure 6 A cross-sectional schematic diagram.

[0042] Figure 8 As shown Figure 6 The structure explodes.

[0043] Figure 9 The diagram shown is another implementation of Example 2.

[0044] Figure 10 The diagram shown is a schematic diagram of the integrated structure of the fully premixed gas ejector pressurization and distribution cavity provided in Embodiment 3 of the present invention.

[0045] Figure 11 As shown Figure 10 A diagram from another perspective.

[0046] Figure 12 The diagram shown is an assembly schematic of the ejector distribution cavity body in Embodiment 3.

[0047] Figure 13 As shown Figure 10 The structure explodes.

[0048] Figure 14 The diagram shown is a schematic diagram of the integrated structure of the fully premixed gas ejector pressurization and distribution cavity provided in Embodiment 4 of the present invention.

[0049] Figure 15 As shown Figure 14 A cross-sectional schematic diagram.

[0050] Figure 16 As shown Figure 14 The structure explodes.

[0051] Figure 17 The diagram shown is a schematic diagram of the integrated structure of the fully premixed gas ejector pressurization and distribution cavity provided in Embodiment 5 of the present invention.

[0052] Figure 18 As shown Figure 17 The structure explodes.

[0053] Figure 19 As shown Figure 17 Cross-sectional view.

[0054] Explanation of the reference numerals in the attached figures.

[0055] 1: Injector distribution chamber body; 2: Mounting end cap; 3: Gas nozzle.

[0056] 101: Intake section, 102: Flow limiting section, 103: Diffusion section, 104: Gas pressure stabilization and distribution chamber, 105: Throat diameter of the flow limiting section.

[0057] 1011: Air intake.

[0058] 1041: Premixed gas outlet.

[0059] A: Gradually widening included angle.

[0060] B1, B2: Stainless steel sheet metal parts.

[0061] C1, C2: Stainless steel sheet metal parts. Detailed Implementation

[0062] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0063] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention.

[0064] Example 1.

[0065] Reference Figures 1-5 As shown, an integrated structure of fully premixed gas ejector pressurization and distribution chamber is provided, suitable for household low-load fanless fully premixed gas equipment with a rated heat load of 2kW to 8kW. The structure includes an ejector distribution chamber body 1, which has an inlet section 101, a flow-limiting section 102, a diffuser section 103, and a gas pressure-stabilizing distribution chamber 104 connected sequentially. The equivalent diameter of the inlet section 101 gradually decreases along the gas flow direction, and an air inlet 1011 is provided on the inlet section 101. The equivalent diameter of the diffuser section 103 gradually increases along the gas flow direction, and the included angle A of the expanding equivalent diameter based on the flow channel axis is 3.5°. The connecting node of the flow-limiting section 102 and the diffuser section 103 constitutes the throat diameter 105 of the flow-limiting section, and the effective length of the diffuser section 103 is 25 times the equivalent diameter of the throat diameter 105 of the flow-limiting section.

[0066] In this embodiment, the gas pressure stabilizing and distributing cavity 104 is a flat circular cavity, and a premixed gas outlet 1041 is provided on one side of the flat circular cavity. In this embodiment, the ejector distribution cavity body 1 is formed by aligning and sealing two upper and lower stainless steel sheet metal parts B1 and B2, with the overall thickness controlled between 18mm and 22mm, meeting the ultra-thin and lightweight assembly requirements of household appliances.

[0067] In this embodiment, the air inlet 1011 consists of four circular holes, evenly arranged on the side wall of the air inlet section 101; the diameter of the throat diameter 105 of the flow-limiting section is 4 mm, the effective length of the diffuser section is 25 times the throat diameter, i.e., 100 mm, the gradual expansion angle A of the equivalent diameter of the flow channel is limited to 3.5°, and a flow channel structure with a smooth and gradual transition from a circular inlet to a flat circular outlet is adopted, without drastic expansion and turning, resulting in extremely low airflow loss.

[0068] In application, an end cap 2 is installed at the end of the intake section 101, and a gas nozzle 3 is installed on the end cap 2. The gas nozzle 3 sprays gas to generate negative pressure to entrain and draw air into the intake section cavity. The gas and air flow from the intake section cavity into the flow restriction section cavity, the diffusion section cavity, and the pressure stabilization and distribution cavity in sequence and are uniformly premixed. Finally, the premixed gas flows out from the combustion plate channel set at the outlet of the pressure stabilization and distribution cavity.

[0069] This embodiment provides an integrated structure for the fully premixed gas ejector pressurization and distribution chamber. It operates under fanless natural ejection conditions, relying on the Venturi negative pressure effect to autonomously entrain atmospheric air, achieving precise full premixing of fuel gas and primary air. This results in fanless operation, no fan maintenance required, and lower energy consumption. Addressing the characteristics of household appliances with low combustion heat exchange resistance and weak positive pressure fluctuations within the furnace, this embodiment achieves stable and uniform distribution of the premixed airflow through a precise equivalent micro-diffusivity angle and a moderate aspect ratio flow channel. This effectively avoids airflow fluctuations and proportioning deviations that are common in household appliances under low-load conditions, ensuring stability and uniformity in low-load combustion. Furthermore, the integrated structure for the fully premixed gas ejector pressurization and distribution chamber provides a stable micro-positive pressure supply environment within the gas pressure stabilization and distribution chamber 104, preventing flue gas backflow. It is suitable for various low-load, conventional-load, and high-load closed-loop fully premixed combustion equipment in household, commercial, and industrial applications.

[0070] Example 2.

[0071] Reference Figures 6-8 As shown, an integrated structure of fully premixed gas ejector pressurization and distribution chamber is provided, suitable for equipment with a rated heat load of 8kW to 18kW medium gradient heat load. It includes an ejector distribution chamber body 1, which has an inlet section 101, a flow-limiting section 102, a diffuser section 103, and a gas pressure-stabilizing distribution chamber 104 connected sequentially. The equivalent diameter of the inlet section 101 gradually decreases along the gas flow direction, and an inlet 1011 is provided on the inlet section 101. The equivalent diameter of the diffuser section 103 gradually increases along the gas flow direction, and the included angle of the expanding equivalent diameter based on the flow channel axis is 3.5°. The connecting node of the flow-limiting section 102 and the diffuser section 103 constitutes the throat diameter 105 of the flow-limiting section, and the effective length of the diffuser section 103 is 45 times the equivalent diameter of the throat diameter 105 of the flow-limiting section.

[0072] In this embodiment, the gas pressure regulating and distribution cavity 104 is a square cavity with the outlet facing upwards, suitable for most high-power household appliances and small to medium-sized commercial gas appliances. In some embodiments, the gas pressure regulating and distribution cavity 104 can be set as a circular cavity, such as... Figure 9 As shown.

[0073] In this embodiment, the ejector distribution chamber body 1 is formed by aligning and sealing two symmetrical stainless steel sheet metal parts. The air inlet 1011 consists of four circular holes, evenly distributed on the side wall of the air inlet section 101. The throat diameter 105 of the flow-limiting section is 5mm, and the effective length of the diffuser section is 45 times the throat diameter, i.e., 225mm. The equivalent diameter gradually expanding angle is fixed at 3.5°, which is the optimal adaptation angle for all operating conditions. Starting from the throat diameter 105 at the junction of the flow-limiting section and the diffuser section, the diffuser section flow channel has a gradually widening flow channel structure that transitions from a round shape to a flat shape, with a moderate lateral expansion ratio, balancing pressure stabilization and flow efficiency.

[0074] In application, an end cap 2 is installed at the end of the intake section 101, and a gas nozzle 3 is installed on the end cap 2. In this embodiment 2, under the condition of no fan, the gas is injected through the gas nozzle 3 to generate negative pressure to entrain and draw air into the intake section cavity. The gas and air flow from the intake section cavity into the flow restriction section cavity, the diffusion section cavity, and the pressure stabilization and distribution cavity in sequence and complete uniform premixing. Finally, the premixed gas flows out from the combustion plate channel set at the outlet of the pressure stabilization and distribution cavity. Under the condition of forced air blowing with a fan, the gas is directly injected through the gas nozzle 3 to entrain high-pressure air into the flow channel to complete homogeneous premixing.

[0075] This embodiment provides an integrated structure for the fully premixed gas ejector pressurization and distribution chamber, meeting the requirements for both fanless and fan-operated operation, demonstrating strong adaptability and versatility. In fanless operation, relying on the pressure and flow stabilization characteristics of the ultra-long, gradually changing flow channel, it autonomously completes atmospheric pressure air ejection premixing, suitable for the low-noise, stable operation requirements of high-power household equipment. In fan-operated forced draft operation, high-pressure air is directly injected and drawn into the flow channel through the gas nozzle. The ultra-long, progressively stabilizing flow channel buffers the high-pressure airflow, suppresses airflow turbulence, and balances airflow pressure, achieving stable high-pressure premixed gas supply under medium load, suitable for commercial small and medium-sized forced draft fully premixed combustion equipment. Furthermore, this integrated structure for the fully premixed gas ejector pressurization and distribution chamber provides excellent resistance to operating condition fluctuations, effectively offsetting the interference of changes in heat exchange resistance and furnace back pressure fluctuations on the premixed ratio, continuously ensuring constant intake volume and accurate ratio, suitable for the long-term continuous and stable operation requirements of medium-load equipment.

[0076] Example 3.

[0077] Reference Figures 10-13As shown, an integrated structure of fully premixed gas ejector pressurization and distribution chamber is provided, suitable for commercial and industrial equipment with a rated heat load of 18kW to 30kW and a large gradient heat load. The structure includes an ejector distribution chamber body 1, which has an inlet section 101, a flow-limiting section 102, a diffuser section 103, and a gas pressure-stabilizing distribution chamber 104 connected sequentially. The equivalent diameter of the inlet section 101 gradually decreases along the gas flow direction, and an inlet 1011 is provided on the inlet section 101. The equivalent diameter of the diffuser section 103 gradually increases along the gas flow direction, and the included angle of the equivalent diameter expansion based on the flow channel axis is 3°. The connecting node of the flow-limiting section 102 and the diffuser section 103 constitutes the throat diameter 105 of the flow-limiting section, and the effective length of the diffuser section 103 is 70 times the equivalent diameter of the throat diameter 105 of the flow-limiting section.

[0078] In this embodiment, the gas pressure stabilizing and distribution cavity 104 is a flat and wide cavity, with a gas outlet 1041 on one side. The flat and wide design of the gas pressure stabilizing and distribution cavity 104 ensures extremely high consistency and large flow rate across the entire gas outlet, meeting the application requirements of commercial and industrial equipment with large gradient heat loads.

[0079] In this embodiment, the ejector distribution cavity body 1 is formed by aligning and sealing two stainless steel sheet metal parts C1 and C2. The air inlet 1011 consists of four round holes, which are evenly arranged on the side wall of the air inlet section 101. The diameter of the throat diameter 105 of the flow limiting section is 6mm. The effective length of the diffuser section is 70 times the throat diameter, i.e., 420mm. The equivalent diameter gradually expanding angle is strictly controlled at 3°. It adopts a super-large ratio round-to-flat wide expansion structure. The flow channel expansion is smooth and the step-by-step pressurization effect is excellent, which can minimize the turbulence loss of large flow and high pressure airflow.

[0080] In application, an end cap 2 is installed at the end of the air intake section 101, and a gas nozzle 3 is installed on the end cap 2. In this embodiment, a forced air blowing condition with a fan is adopted, and the gas is directly injected through the gas nozzle 3 to draw high-pressure air into the flow channel to complete homogeneous premixing.

[0081] This embodiment provides an integrated structure for the fully premixed gas ejector pressurization and distribution chamber, specifically designed for demanding industrial and commercial applications with high resistance, high air pressure, and large flow rates. In the presence of a fan, it is adaptable to the high-pressure blower intake conditions of industrial equipment. Through an ultra-long pressure-stabilizing flow channel, it completely solves the problems of turbulent high-pressure airflow, uneven pressure, and imbalanced proportions, achieving high-load, high-pressure, and high-precision premixed gas supply. This integrated structure for the fully premixed gas ejector pressurization and distribution chamber, with its single-ejector integrated structure, can replace the traditional multi-ejector parallel assembly structure, completely avoiding the drawbacks of multi-unit airflow interference, poor pressure consistency, and bulky structure. It is suitable for high-resistance, closed-circuit combustion conditions such as industrial combustion equipment, high-power hot air furnaces, and large commercial heating equipment.

[0082] Example 4.

[0083] Reference Figures 14-16 As shown, an integrated structure of fully premixed gas ejector pressurization and distribution chamber is adapted to ultra-thin vertical plate heat exchangers and industrial linear combustion equipment. It includes an ejector distribution chamber body 1, which has an inlet section 101, a flow-limiting section 102, a diffusion section 103, and a gas pressure-stabilizing distribution chamber 104 connected sequentially. The equivalent diameter of the inlet section 101 gradually decreases along the gas flow direction, and an air inlet 1011 is provided on the inlet section 101. The equivalent diameter of the diffusion section 103 gradually increases along the gas flow direction, and the included angle of the equivalent diameter expansion based on the flow channel axis is 4°. The connecting node of the flow-limiting section 102 and the diffusion section 103 constitutes the throat diameter 105 of the flow-limiting section, and the effective length of the diffusion section 103 is 60 times the equivalent diameter of the throat diameter 105 of the flow-limiting section.

[0084] In this embodiment, the gas pressure stabilizing and distribution chamber 104 adopts a slender, flat, linear cavity shape, with the overall cavity thickness controlled within 15mm, and the gas outlet facing upwards. The gas pressure stabilizing and distribution chamber 104 adopts a long, linear gas outlet layout, which is suitable for narrow assembly spaces and linear gas supply requirements.

[0085] In this embodiment, the air inlet 1011 consists of four circular holes, which are evenly arranged on the side wall of the air inlet section 101; the throat diameter 105 of the flow limiting section is set to 3.5 mm, the effective length of the diffusion section is 60 times the throat diameter, i.e., 210 mm, and the gradual expansion angle of the equivalent diameter is 4°, which is suitable for the low-loss diffusion and voltage stabilization requirements of the slender flow channel.

[0086] In application, an end cap 2 is installed at the end of the intake section 101, and a gas nozzle 3 is installed on the end cap 2. In this embodiment, under the condition of no fan, the gas is injected through the gas nozzle 3 to generate negative pressure to entrain and draw air into the intake section cavity. The gas and air flow from the intake section cavity into the flow restriction section cavity, the diffusion section cavity, and the pressure stabilization and distribution cavity in sequence and complete uniform premixing. Finally, the premixed gas flows out from the combustion plate channel set at the outlet of the pressure stabilization and distribution cavity. Under the condition of forced air blowing with a fan, the gas is directly injected through the gas nozzle 3 to entrain high-pressure air into the flow channel to complete homogeneous premixing.

[0087] This embodiment provides an integrated structure for a fully premixed gas ejector pressurization and distribution chamber, which can completely transform the circular bundle-shaped air intake into a long, linear, uniform surface-shaped air output, thoroughly solving the industry problem of poor uniformity of linear air supply and bundle-shaped air output in traditional chambers. At the same time, it is compatible with both fanless and fan-operated modes. The fanless mode is suitable for small, ultra-thin household linear combustion equipment, while the fan-operated mode is suitable for industrial continuous linear flame processing equipment. It can continuously ensure uniform premixing ratio, stable airflow, and consistent output under all gradient conditions from low to medium load, perfectly adapting to high-end gas combustion application scenarios that require ultra-thinness, linearity, and high precision.

[0088] Example 5.

[0089] Reference Figures 17-19 As shown, an integrated structure of a fully premixed gas ejector pressurization and distribution chamber is adapted to various conventional power closed gas equipment. It includes an ejector distribution chamber body 1, which has an inlet section 101, a flow-limiting section 102, a diffusion section 103, and a gas pressure-stabilizing distribution chamber 104 connected sequentially. The equivalent diameter of the inlet section 101 gradually decreases along the gas flow direction, and an inlet 1011 is provided on the inlet section 101. The equivalent diameter of the diffusion section 103 gradually increases along the gas flow direction, and the expanding angle of the equivalent diameter based on the flow channel axis is 3.5°. The connecting node of the flow-limiting section 102 and the diffusion section 103 constitutes a flow-limiting section throat diameter 105, and the effective length of the diffusion section 103 is 30 times the equivalent diameter of the flow-limiting section throat diameter 105.

[0090] In this embodiment, the gas pressure stabilizing and distribution cavity 104 adopts a lateral docking assembly structure, and gas outlets 1041 are symmetrically provided on both sides of the gas pressure stabilizing and distribution cavity 104; the overall structure is compact, occupies little space, is easy to assemble, and is inexpensive.

[0091] In this embodiment, the air inlet 1011 consists of four circular holes, which are evenly arranged on the side wall of the air inlet section 101; the throat diameter 105 of the flow limiting section is set to 4.5 mm, the effective length of the diffuser section is 30 times the throat diameter, i.e., 135 mm, the gradual expansion angle of the equivalent diameter is 3.5°, the flow channel expansion is uniform, and the pressure stabilization performance is stable.

[0092] In application, an end cap 2 is installed at the end of the intake section 101, and a gas nozzle 3 is installed on the end cap 2. In this embodiment, under the condition of no fan, the gas is injected through the gas nozzle 3 to generate negative pressure to entrain and draw air into the intake section cavity. The gas and air flow from the intake section cavity into the flow restriction section cavity, the diffusion section cavity, and the pressure stabilization and distribution cavity in sequence and complete uniform premixing. Finally, the premixed gas flows out from the combustion plate channel set at the outlet of the pressure stabilization and distribution cavity. Under the condition of forced air blowing with a fan, the gas is directly injected through the gas nozzle 3 to entrain high-pressure air into the flow channel to complete homogeneous premixing.

[0093] This embodiment provides an integrated structure for the fully premixed gas ejector pressurization and distribution chamber, which balances mass production economy and operating condition adaptability. It operates stably under both operating conditions and can adapt to the full gradient load gas supply needs of household conventional power equipment and commercial small equipment. The structure has strong versatility and wide adaptability, making it suitable for batch standardized mass production. It can be widely adapted to various conventional closed / semi-closed fully premixed combustion equipment.

[0094] Based on the above description of the structure and principles, those skilled in the art should understand that this invention is not limited to the specific embodiments described above. Improvements and substitutions made using techniques known in the art based on this invention all fall within the scope of protection of this invention, which should be defined by the claims and their equivalents. Parts not described in the specific embodiments are all prior art or common knowledge.

Claims

1. An integrated structure for a fully premixed gas ejector pressurization and distribution cavity, characterized in that, The device includes an ejector distribution cavity body, on which an ejector flow channel and a pressure stabilizing distribution cavity are connected; the ejector flow channel is sequentially connected to an air inlet section, a flow limiting section and a diffuser section along the airflow direction; the axial length of the diffuser section is more than 15 times the equivalent diameter of the throat of the flow limiting section, and the equivalent gradually expanding angle of the sidewall of the diffuser section is not greater than 5°; the pressure stabilizing distribution cavity is a flat and wide cavity.

2. The integrated structure of a fully premixed gas ejector pressurization and distribution cavity according to claim 1, characterized in that, The ejector distribution cavity is formed by aligning and sealing two independent sheet metal stretching parts; each sheet metal stretching part is formed with an ejector flow channel semi-cavity contour and a voltage stabilizing distribution cavity semi-cavity contour. After the two sheet metal stretching parts are sealed and assembled, the corresponding semi-cavity contours enclose and form an integrated cavity that connects the ejector flow channel and the voltage stabilizing distribution cavity.

3. The integrated structure of a fully premixed gas ejector pressurization and distribution cavity according to claim 1, characterized in that, The axial length of the diffuser section is 20 to 80 times the equivalent diameter of the throat of the flow-limiting section, and the equivalent micro-diffraction angle of the diffuser section is 3° to 4°.

4. The integrated structure of a fully premixed gas ejector pressurization and distribution cavity according to claim 1 or 3, characterized in that, The diffuser section is an irregularly shaped, gradually changing flow channel that transitions from a circular inlet to a flat, wide rectangular outlet. The equivalent diameter of the diffuser section gradually increases along the airflow direction. The irregularly shaped, gradually changing flow channel that transitions from a circular inlet to a flat, wide rectangular outlet achieves step-by-step deceleration and pressurization of the airflow, transforming the airflow from a bundle-shaped circular inlet to a uniform planar outlet.

5. The integrated structure of a fully premixed gas ejector pressurization and distribution cavity according to claim 1, characterized in that, The voltage stabilizing distribution cavity can be any one of a square cavity, a circular cavity, or a slender linear cavity.

6. The integrated structure of a fully premixed gas ejector pressurization and distribution cavity according to claim 1, characterized in that, The outlet of the pressure-stabilizing distribution chamber is located at the top and / or side. The pressure-stabilizing distribution chamber is equipped with a fully premixed combustion plate to form a positive pressure high-resistance combustion environment through lateral docking and / or top vertical docking.

7. The integrated structure of a fully premixed gas ejector pressurization and distribution cavity according to claim 1, characterized in that, The equivalent diameter of the air intake section gradually narrows along the airflow direction. Several air inlets are provided on the side wall of the air intake section. An end cap is assembled at the end of the air intake section, and a gas nozzle is fixed on the end cap.

8. The integrated structure of a fully premixed gas ejector pressurization and distribution cavity according to claim 1, characterized in that, The ejector distribution chamber is a single-ejector full-range voltage-stabilized structure, which can be matched with fully premixed gas equipment with a power range of 2kW to 30kW by adjusting its shape, size and performance parameters.

9. The application of the integrated structure of fully premixed gas ejector pressurization and distribution cavity according to any one of claims 1 to 8, characterized in that, It is applied to fanless, natural-injection, atmospheric-pressure, fully premixed gas equipment.

10. The application of the integrated structure of the fully premixed gas ejector pressurization and distribution cavity according to any one of claims 1 to 8, characterized in that, It is applied to fully premixed gas equipment with forced air blowing and high-pressure premixing.

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