Venturi mixer with adjustable flow limitation and operation method thereof
By incorporating an adjustable regulating cone ring and a helical tangential fuel ejector in the Venturi mixer, the problem of the inability to adjust the flow rate in existing mixers is solved, achieving efficient mixing under different operating conditions and improving mixing uniformity and adaptability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-09
- Publication Date
- 2026-04-10
AI Technical Summary
Existing Venturi mixers cannot adjust their size according to the flow ratio of the main fluid and the introduced fluid, resulting in low fluid mixing efficiency, uneven mixing, and the mixer structure cannot adapt to the needs of different operating conditions.
A venturi mixer with adjustable flow limit was designed. It employs two sets of axially movable adjusting cone rings inside the venturi tube, combined with a helical tangential fuel ejector and a multi-stage nested adjustment structure. By adjusting the position of the cone rings, the flow cross section at the throat is changed, achieving precise flow matching. A flexible transition section and an expandable sealing gasket layer ensure airtightness.
It significantly improves the adaptability and efficiency of the mixer under different operating conditions, enhances the uniformity of fuel-air mixing and the overall performance of the mixer, and ensures a fast and uniform mixing effect under various flow rates. At the same time, it has a compact structure and a reliable adjustment mechanism.
Smart Images
Figure CN121828039A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of fuel and air mixing of non-road engine, in particular to a venturi mixer with adjustable flow restriction and its operation method. BACKGROUND
[0002] The venturi mixer as an important gas-liquid or liquid-liquid mixing device has a wide application in engineering practice. The common venturi mixer is a classic venturi tube with a throat opening. The main flow fluid flows through the classic venturi tube, and the introduced fluid is introduced through the opening by using the pressure difference, and the introduced fluid is mixed with the main flow fluid by using the pressure difference. The existing venturi mixer is composed of pipes with fixed size and shape, and cannot be adjusted in size according to the flow ratio of the main flow fluid and the introduced fluid, resulting in low fluid mixing efficiency. In the venturi structure, the mixing fluid disturbance is small, which easily causes uneven mixing and low mixing efficiency. Therefore, we propose a venturi mixer with adjustable flow restriction and its operation method to solve the above problems. SUMMARY
[0003] The present application aims to provide a venturi mixer with adjustable flow restriction and its operation method to solve the problems raised in the background.
[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a venturi mixer with adjustable flow restriction, comprising an outer shell, a venturi tube is sleeved in the inner part of the outer shell, a connecting seat is installed in the middle of the outer side of the outer shell, the venturi tube has a throat in the middle and a converging section and a diffuser section on both sides of the throat, and a fuel injection hole is formed in the middle of the throat, a fuel channel is formed between the outer shell and the connecting seat, and the fuel channel is in communication with the fuel injection hole; The fuel injection hole is in communication with the inside of the venturi tube in a spiral tangential direction, and is circumferentially distributed on the throat; Two groups of opposite adjusting cone rings are arranged in the converging section, the diffuser section and the throat of the venturi tube, and the adjusting cone rings can be relatively close to or away from each other along the axis of the venturi tube; Each group of adjusting cone rings forms a frustum shape adapted to the inside of the venturi tube, and the small diameter end of the two groups of adjusting cone rings abuts at the fuel injection hole; Each group of adjusting cone rings is composed of a plurality of adjusting cone rings with gradually changing sizes, and the adjusting cone ring with a large size is arranged close to the side of the adjusting cone ring with a small size, and a receiving groove is formed on the side of the adjusting cone ring with a large size close to the side of the adjusting cone ring with a small size, the adjusting cone ring is slidably connected in the adjacent receiving groove, and the receiving groove can completely accommodate the adjacent adjusting cone ring with a small size; When the two groups of adjusting cone rings are close to each other, the adjusting cone rings are sequentially received into the receiving grooves from the small diameter end.
[0005] In a preferred embodiment of the present invention, the circumferential sidewall of the storage groove has a concave annular space. The adjusting cone ring is circumferentially mounted with several guide blocks on one side inside the receiving groove by bolts, and the outer end of the guide block is in contact with the outer peripheral sidewall of the annular space. A spring is installed on one side of the adjusting cone ring inside the receiving groove. The spring abuts against the receiving groove, and the spring force gradually increases from the smaller diameter adjusting cone ring to the larger diameter adjusting cone ring.
[0006] As a preferred embodiment of the present invention, the Venturi tube further comprises smooth sections located at both ends of the converging section and the diffusing section. The inner sides of both ends of the outer casing are provided with annular mounting grooves. An expandable sealing gasket layer that fits into the inner wall of the outer casing is installed in the mounting groove, and the expandable sealing gasket layer contacts the outer side wall of the smooth section of the venturi tube to form a sealing structure. A pressurization interface is installed on the outer side of the housing corresponding to the mounting slot, and the pressurization interface can be connected to an external pressurization device.
[0007] In a preferred embodiment of the present invention, the venturi tube comprises a throat, a flexible transition section, and an end connecting tube; The larynx forms the larynx, and the flexible transition sections are respectively installed at both ends of the larynx, forming a tapering section and a spreading section; The end connecting pipes are respectively installed at the far ends of the two flexible transition sections, forming a smooth section. The end connecting pipes can slide axially inside the shell, and the flexible transition sections can produce elastic deformation to cooperate with the movement of the end connecting pipes. Support rings are installed at both ends of the outer wall of the throat tube. The outer side of the support ring is in contact with the inner side of the outer shell, and a sealing gasket is provided between them. The fuel ejector hole is connected to the fuel channel through the gap between the support rings.
[0008] In a preferred embodiment of the present invention, a sealed deformation compensation cavity is formed between the flexible transition section, the support ring, and the inner wall of the outer shell. The deformation compensation cavity is filled with a fluid medium, which has the characteristics of being shaped in a cold state and softened in a hot state. A filling port is installed on the outer side of the outer shell. The filling port is connected to the deformation compensation cavity, and the fluid medium can be filled into the deformation compensation cavity through the filling port.
[0009] In a preferred embodiment of the present invention, threaded sections are provided on the outer sides of both ends of the outer casing; The end of the end connecting pipe is provided with a detachable drive connector, which is threadedly connected to the threaded section.
[0010] In a preferred embodiment of the present invention, a protruding ring is provided on the outer side of the end of the end connecting pipe; The drive connector includes an internally threaded sleeve and a pressure ring; The internal threaded sleeve and the pressure ring are connected by bolts, and the convex rings are sandwiched in the middle; The inner side of the internally threaded sleeve is threadedly connected to the threaded section.
[0011] As a preferred embodiment of the present invention, an mounting ear plate is installed on the inner side of the end connecting tube near the flexible transition section; A linkage ring is bolted to one side of the largest diameter adjusting cone ring in each set. A connecting part is provided on the outer circumference of the linkage ring. The connecting part is connected to the mounting ear plate by bolts. There is a gap between the adjusting cone ring and the linkage ring and the inner wall of the venturi tube.
[0012] A method of operating a Venturi mixer with adjustable flow limit includes the following steps: Step 1: Pre-assemble the adjusting cone ring inside the venturi tube, then assemble the venturi tube onto the housing, and finally assemble the drive connector onto the housing. The smaller diameter ends of the two sets of adjusting cone rings initially abut at the throat to ensure that the fuel injection port is in the connection area of the two sets of adjusting cone rings. Step 2: According to the rated operating conditions, rotate the internal threaded sleeve to drive the end connecting pipe to move axially, causing the two sets of adjusting cone rings to move closer or further apart, adjust the extension degree of the two sets of adjusting cone rings, determine the flow cross-sectional size of the connection area between the throat pipe and the adjusting cone rings, and achieve rated flow matching. Step 3: Connect the connector in the mixer to the fuel line, and connect the end connector to the air line through the flange and hose. Inject the gas at the preset pressure into the mounting groove through the pressurization port to expand the expandable sealing gasket and tightly fit the outer wall of the end connector to form a reliable seal. Step 4: Inject a preset amount of fluid medium into the deformation compensation cavity through the filling port. Select the cold setting hardness of the fluid medium according to the working temperature requirements. After completion, seal the filling port. Step 5: Fuel enters the fuel channel through the connector and is injected into the venturi tube through the circumferential spiral tangential fuel injection hole at the throat, forming a spiral mixed airflow with the air to improve the mixing uniformity.
[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This venturi mixer with adjustable flow limit achieves continuous adjustment of the effective flow cross section of the throat and adjacent areas through two sets of adjustable cone rings that can move axially relative to each other inside the venturi tube. Users can drive the two sets of cone rings to change their relative positions according to different operating conditions (such as idling, medium load, and full load), thereby accurately matching the required air flow, optimizing the air-fuel ratio, and significantly improving the mixer's adaptability to different operating conditions and the efficiency and emissions of the entire system.
[0014] 2. This Venturi mixer with adjustable flow limit employs a unique helical tangential fuel ejector design. Instead of being injected vertically or parallel into the airflow, the fuel is injected into the throat of the Venturi tube in a tangentially rotating manner. This greatly enhances the shear and swirling interaction between the fuel jet and the mainstream airflow, generating strong turbulence at the beginning of mixing. This significantly shortens the mixing distance and improves the microscopic mixing uniformity of fuel and air. Combined with the optimized velocity field formed by the adjustable cross-section, it ensures rapid and uniform mixing at various flow rates.
[0015] 3. This Venturi mixer with adjustable flow limit employs a nested multi-stage adjustable conical ring structure, combined with guide blocks and progressive springs, to ensure a smooth and stable adjustment process with orderly expansion and contraction between the rings, avoiding jamming. Simultaneously, through the integrated design of a flexible transition section, an expandable sealing gasket, and a deformation compensation cavity for a specific fluid medium, it ensures that the Venturi tube body can flexibly deform during adjustment to accommodate the movement of the internal conical rings, while also ensuring reliable airtightness between the outer shell and moving parts at any adjustment position. The overall structure is compact, the adjustment mechanism is reliable, and the sealing performance is excellent. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of the present invention.
[0018] Figure 2 This is a schematic diagram of the structure in the frontal cross-section of the present invention; Figure 3 This is a top view of the structure in this invention; Figure 4 This is a schematic diagram of the right-side cross-section of the structure in this invention; Figure 5This is a schematic diagram of the structure of the Chinese-language tube connection of the present invention, viewed from the front and in cross-section. Figure 6 This is a schematic diagram of the adjusting cone ring connection in this invention; Figure 7 This is a schematic diagram of the cross-sectional view of the adjusting cone ring connection in this invention; Figure 8 In this invention Figure 2 Schematic diagram of the structure at point A; Figure 9 In this invention Figure 5 Schematic diagram of the structure at point B; Figure 10 In this invention Figure 7 A schematic diagram of the structure at point C.
[0019] In the diagram: 1. Outer shell; 11. Threaded section; 101. Fuel passage; 102. Pressurization port; 103. Filling port; 104. Mounting slot; 105. Deformation compensation cavity; 2. Connecting base; 3. Venturi tube; 31. Throat; 32. Throat tube; 33. Flexible transition section; 34. End connecting tube; 341. Mounting lug; 35. Support ring; 36. Protruding ring; 301. Fuel injection port; 4. Adjusting cone ring; 41. Guide block; 42. Spring; 401. Storage groove; 5. Linkage ring; 51. Connecting part; 6. Drive connector; 61. Internal threaded sleeve; 62. Pressure ring. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] Example 1: As Figures 1-10As shown, the present invention provides a Venturi mixer with adjustable flow limit, including a shell 1. The shell 1 serves as the main support and protective structure of the mixer and is usually made of metal material (such as aluminum alloy or stainless steel). The interior is a hollow cylindrical cavity. A Venturi tube 3 is coaxially fitted inside the shell 1. A connecting seat 2 is installed in the middle of the outer side of the shell 1 for connecting to an external fuel supply pipeline. The Venturi tube 3 has a throat 31 in the middle and tapering and diffusion sections on both sides of the throat 31. The throat 31 has the smallest cross-sectional area and is the key area for generating negative pressure to eject fuel and accelerate fluid. A fuel ejection port 301 is opened in the middle of the throat 31. A fuel channel 101 is opened between the shell 1 and the connecting seat 2, and the fuel channel 101 is connected to the fuel ejection port 301. The fuel ejector holes 301 are spirally tangentially connected to the interior of the Venturi tube 3 and are circumferentially distributed on the throat 31. The key point is that these fuel ejector holes 301 are not opened radially, but are spirally tangentially connected to the internal flow channel of the Venturi tube 3. This means that the fuel ejected from the fuel channel 101 through the ejector holes 301 has a velocity component along the tangential direction of the inner wall of the Venturi tube, so that the fuel jet has a tendency to rotate as soon as it enters the mainstream air. In the inner cavity of the Venturi tube 3, from the converging section, throat 31 to the diffuser section, there are two sets of opposing adjusting cone rings 4 on the left and right, and the adjusting cone rings 4 can move closer or further apart relative to each other along the axial direction of the Venturi tube 3. Each set of regulating cone rings 4 forms a frustum shape adapted to the interior of the Venturi tube 3. The overall shape of each set of regulating cone rings 4 is adapted to the contour of the inner wall of the Venturi tube at its location, forming a frustum shape. The small diameter ends of the two sets of regulating cone rings 4 abut against each other at the fuel injection port 301. The small diameter ends (i.e., the tips of the frustum) of the two sets of regulating cone rings 4 are arranged opposite each other, and their initial positions are designed to abut against each other in the central region of the throat 31. When they approach each other, the conical surfaces of the two sets of regulating cone rings 4 together form a smaller effective flow channel in the throat region. When they move away from each other, this flow channel formed by the outer surface of the regulating cone rings 4 gradually expands. By controlling the relative position of the two sets of regulating cone rings 4, the minimum flow cross-sectional area of the throat of the Venturi tube 3 and its surrounding area can be continuously changed, thereby achieving the purpose of regulating and limiting the mainstream airflow. Each set of adjustment cone rings 4 consists of multiple adjustment cone rings 4 with gradually changing diameters. Each set of adjustment cone rings 4 is nested together by multiple independent adjustment cone ring units with gradually changing diameters. For example, starting from the smallest diameter adjustment cone ring 4 closest to the center of the throat 31, the adjustment cone rings 4 with slightly larger diameters are arranged outwards until the largest diameter adjustment cone ring 4. The side of the large diameter adjustment cone ring 4 near the adjacent small diameter adjustment cone ring 4 has a receiving groove 401. The depth of the receiving groove 401 is designed to be sufficient to completely accommodate the adjacent small diameter adjustment cone ring 4. The adjacent, smaller diameter adjustment cone ring 4 can slide and be completely accommodated in this receiving groove 401 (adjacent receiving groove 401), and the receiving groove 401 can completely accommodate the adjacent small diameter adjustment cone ring 4. This nested structure allows the multi-stage adjustment cone rings 4 to extend and retract like a telescope tube. When the two sets of adjusting cone rings 4 approach each other, the adjusting cone rings 4 are successively stored in the storage groove 401 from the smaller diameter end. When the two sets of adjusting cone rings 4 are driven to approach each other, the ring body of each adjusting cone ring 4 slides and contracts into the storage groove 401 of the adjacent larger ring in turn, so that the entire adjusting cone ring 4 is shortened in the axial direction. At the same time, the throat formed by the inner cone surface of the combination becomes smaller. Conversely, when they are driven to move away from each other, the ring body of each adjusting cone ring 4 slides out of the storage groove 401, extends in the axial direction, and the throat becomes larger. This multi-level nested design ensures the continuity and smoothness of the flow channel profile change during the adjustment process.
[0022] Example 2: As Figures 1-10 As shown, in order to ensure that the multiple nested adjustment cone rings 4 move smoothly, are well aligned and can automatically reset during the extension and retraction process, the circumferential sidewall of the storage groove 401 has a concave annular space. The circumferential sidewall of the storage groove 401 is not a simple vertical wall, but has a concave annular space, which provides a margin of movement for the internal moving parts. On one side of each adjusting cone ring 4 within the receiving groove 401 (i.e., the side within the receiving groove 401 of the adjacent large adjusting cone ring 4), several guide blocks 41 are circumferentially installed by bolts. The outer ends of the guide blocks 41 slide in contact with the outer peripheral sidewall of the annular space. These guide blocks 41 play a role in radial positioning and guidance, preventing the adjusting cone ring 4 from swaying or getting stuck in the receiving groove 401, and ensuring that it can only slide smoothly along the axial direction. A spring 42 is installed on one side of the adjusting cone ring 4 inside the receiving groove 401. The spring 42 abuts against the receiving groove 401 and is pre-compressed, always providing a spring force to make the adjusting cone ring 4 pop outward. The spring force of the spring 42 gradually increases from the small diameter adjusting cone ring 4 to the large diameter adjusting cone ring 4. From the smallest diameter adjusting cone ring 4 (closest to the throat) to the largest diameter adjusting cone ring 4, the spring force (stiffness or preload) of the equipped spring 42 gradually increases. This design ensures that when the driving external force is released and the adjusting cone ring 4 needs to extend outward, each adjusting cone ring 4 ring body can pop out in sequence and smoothly, rather than moving in a chaotic and disorderly manner, thereby ensuring that the process of flow channel expansion is also controllable and smooth.
[0023] like Figures 1-10 As shown, the Venturi tube 3 also has smooth sections located at both ends of the tapering section and the diffusion section, respectively; The inner sides of both ends of the outer casing 1 are provided with annular mounting grooves 104. An expandable sealing gasket layer that fits the inner wall of the outer casing 1 is installed in the mounting grooves 104. The expandable sealing gasket layer can be made of rubber, silicone or elastic material containing reinforcing fabric. Its inner side contacts the outer wall of the smooth section of the Venturi tube 3, and the expandable sealing gasket layer contacts the outer wall of the smooth section of the Venturi tube 3 to form a sealing structure. A pressurization interface 102 is installed on the outer side of the outer casing 1, corresponding to the mounting groove 104. The pressurization interface 102 can be connected to an external pressurization device. After the mixer is installed and debugged, a certain pressure of gas (such as clean compressed air or nitrogen) is injected into the mounting groove 104 through the pressurization port 102. The gas pressure causes the expandable sealing gasket in the mounting groove 104 to expand towards the outer wall of the smooth section of the Venturi tube 3, so that the expandable sealing gasket tightly hugs the outer wall of the smooth section of the Venturi tube 3, thereby forming an effective seal to prevent air or fuel leakage.
[0024] Example 3: As Figures 1-10 As shown, the Venturi tube 3 consists of a throat 32, a flexible transition section 33, and an end connecting tube 34; The larynx 32 forms the larynx. The larynx 32 is usually a rigid short tube. Flexible transition sections 33 are installed at both ends of the larynx 32 and form a tapering section and a diffuser section, respectively. The end connecting pipes 34 are respectively installed at the far ends of the two flexible transition sections 33. The end connecting pipes 34 are usually a rigid short pipe and form a smooth section. The end connecting pipes 34 can slide axially inside the outer shell 1, and the flexible transition sections 33 can produce elastic deformation to cooperate with the movement of the end connecting pipes 34. The flexible transition sections 33 are made of a material with good elasticity, such as special rubber or flexible composite material. It is designed to present the tapered or diffused profile required by the Venturi tube in its natural state. The two end connecting pipes 34 are respectively fixed to the free ends of the two flexible transition sections 33. Support rings 35 are installed at both ends of the outer wall of the throat tube 32. The outer side of the support ring 35 contacts the inner side of the outer shell 1, and a sealing gasket is provided between them, so as to achieve relative fixation and static sealing between the throat tube 32 and the outer shell 1. The fuel ejector port 301 is connected to the fuel channel 101 through the gap between the support rings 35. The connection between the fuel channel 101 and the fuel ejector port 301 is achieved through the annular space between the outer wall of the throat 32 and the inner wall of the outer shell 1 (i.e., the gap between the support rings 35). When flow adjustment is required, the end connecting pipes 34 at both ends are pulled or pushed axially by the external drive connector (described later). Since the throat pipe 32 is basically fixed (i.e. limited) by the housing 1 through the support ring 35, the movement of the end connecting pipes 34 will force the flexible transition section 33 in the middle to undergo elastic stretching or retraction deformation. For example, when the end connecting pipes 34 at both ends move inward, the flexible transition section 33 is retracted, which shortens the axial length of the entire Venturi tube 3; conversely, it is stretched and lengthened. This design allows the Venturi tube 3 to adapt to the spatial changes required by the expansion and contraction of the internal regulating cone ring 4 assembly without generating excessive internal stress or damaging the structure.
[0025] like Figures 1-10 As shown, the flexible transition section 33, the support ring 35, and the inner wall of the outer shell 1 form a closed deformation compensation cavity 105, which surrounds the flexible transition section 33. The deformation compensation cavity 105 is filled with a fluid medium that has the characteristics of being fixed in a cold state and softening in a hot state. This fluid medium has the characteristics of "fixing in a cold state and softening in a hot state". For example, some thixotropic gels, phase change materials or temperature-sensitive viscosity fluids have high viscosity or even be semi-solid at room temperature or low temperature (cold state). This can provide certain support and damping for the wall of the flexible transition section 33, which helps to maintain the stability of the Venturi tube shape and suppress the tube wall vibration caused by internal fluid pressure pulsation. When the temperature rises (hot state), the medium softens and its fluidity increases, thereby reducing the constraint force on the deformation of the flexible transition section 33, allowing it to deform more freely during adjustment, while still playing the role of transmitting pressure, providing uniform support and vibration reduction. Users can select a fluid medium with a suitable phase change point or viscosity-temperature curve according to the typical operating temperature range of the engine, and adjust the filling amount through the filling port 103 to optimize performance. A filling port 103 is installed on the outer side of the outer casing 1. The filling port 103 is connected to the deformation compensation cavity 105, and the fluid medium can be filled into the deformation compensation cavity 105 from the filling port 103.
[0026] Example 4: Figures 1-10 As shown, threaded sections 11 are provided on the outer sides of both ends of the outer casing 1; The end of the end connecting pipe 34 is provided with a detachable drive connector 6, which is threadedly connected to the threaded section 11.
[0027] like Figures 1-10 As shown, a protruding ring 36 is provided on the outer side of the end of the end connecting pipe 34; The drive connector 6 includes an internally threaded sleeve 61 and a pressure ring 62; The internal threaded sleeve 61 and the pressure ring 62 are connected by bolts, and the convex ring 36 is sandwiched in the middle; The inner side of the internal threaded sleeve 61 is threadedly connected to the threaded section 11. During installation, the convex ring 36 of the end connecting pipe 34 is placed at the port of the internal threaded sleeve 61, and then the pressure ring 62 is used to press the other side of the convex ring 36. The connecting bolts are tightened, thereby firmly restricting the convex ring 36 between the internal threaded sleeve 61 and the pressure ring 62. In this way, the end connecting pipe 34 and the internal threaded sleeve 61 form a linkage. When adjustment is required, use a tool (such as a wrench) to rotate the internal threaded sleeve 61. Since the internal threaded sleeve 61 engages with the threaded section 11 of the outer shell 1, the rotational motion is converted into an axial translational motion of the internal threaded sleeve 61 together with the end connecting pipe 34 that is restricted by it relative to the outer shell 1. By rotating the drive connectors 6 at both ends respectively, the two end connecting pipes 34 can be controlled to move synchronously or asynchronously towards or away from each other, thereby driving the internal adjusting cone ring 4 assembly to change its relative position. The threaded drive mode provides good self-locking and precise displacement control. The position is stable after adjustment and will not be easily changed due to fluid impact.
[0028] like Figures 1-10 As shown, an mounting ear plate 341 is installed on the inner side of the end connecting pipe 34 near the flexible transition section 33; A linkage ring 5 is bolted to one side of the largest diameter adjustment cone ring 4 in each set of adjustment cone rings 4 (i.e., the ring closest to the inlet or outlet end of the Venturi tube). A connecting part 51 is provided on the outer circumference of the linkage ring 5. The connecting part 51 is connected to the mounting ear plate 341 by bolts. There is a gap between the adjustment cone ring 4 and the linkage ring 5 and the inner wall of the Venturi tube 3. During installation, the connecting part 51 on the linkage ring 5 is fixedly connected to the mounting ear plate 341 on the end connecting pipe 34 by bolts. Therefore, when the end connecting pipe 34 is driven to move axially, the linkage ring 5 and the set of adjustment cone rings 4 fixed thereto are moved as a whole through the mounting ear plate 341 and the connecting part 51. It should be noted that the outer diameter of the adjustment cone ring 4 and the linkage ring 5 is slightly smaller than the inner diameter of the corresponding position of the Venturi tube 3. They maintain an annular gap. This gap ensures smooth adjustment and allows fluid to pass through without affecting the adjustment function of the main flow section.
[0029] A method of operating a Venturi mixer with adjustable flow limit includes the following steps: Step 1: Pre-assemble the adjusting cone ring 4 inside the venturi tube 3, then assemble the venturi tube 3 onto the housing 1, and finally assemble the drive connector 6 onto the housing 1. The small diameter ends of the two sets of adjusting cone rings 4 initially abut at the throat 31 to ensure that the fuel injection port 301 is in the connection area of the two sets of adjusting cone rings 4. Step 2: According to the rated operating conditions, rotate the internal threaded sleeve 61 to drive the end connecting pipe 34 to move axially, thereby moving the two sets of adjusting cone rings 4 closer or further apart, adjusting the extension degree of the two sets of adjusting cone rings 4, determining the flow cross-sectional size of the connection area between the throat pipe 32 and the adjusting cone ring 4, and achieving rated flow matching. Step 3: Connect the connector 2 in the mixer to the fuel line, and connect the end connector 34 to the air line through the flange and hose. Inject the gas at a preset pressure into the mounting groove 104 through the pressurization port 102, so that the expandable sealing gasket expands and tightly fits the outer wall of the end connector 34 to form a reliable seal. Step 4: Inject a preset amount of fluid medium into the deformation compensation cavity 105 through the filling port 103. Select the cold setting hardness of the fluid medium according to the working temperature requirements. After completion, seal the filling port 103. Step 5: Fuel enters the fuel channel 101 through the connecting seat 2, and is injected into the venturi tube 3 through the circumferential spiral tangential fuel injection hole 301 of the throat 31, forming a spiral mixed airflow with the air to improve the mixing uniformity.
[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A Venturi mixer with adjustable flow restriction, comprising a shell (1), the inside of the shell (1) is sleeved with a Venturi tube (3), a connecting seat (2) is installed in the middle of the outside of the shell (1), the Venturi tube (3) has a throat (31) in the middle and converging sections and diffusing sections on both sides of the throat (31), a fuel injection hole (301) is formed in the middle of the throat (31), a fuel channel (101) is formed between the shell (1) and the connecting seat (2) and communicates with the fuel injection hole (301); the fuel injection hole (301) communicates with the inside of the Venturi tube (3) in a helical tangential direction and is circumferentially distributed on the throat (31); two groups of opposite adjusting cone rings (4) are arranged in the converging sections, the diffusing sections and the throat (31) of the Venturi tube (3) and can be relatively close to or away from each other along the axial direction of the Venturi tube (3); each group of adjusting cone rings (4) forms a frustum shape that is adapted to the inside of the Venturi tube (3) and the small-diameter ends of the two groups of adjusting cone rings (4) abut at the fuel injection hole (301); each group of adjusting cone rings (4) is composed of a plurality of adjusting cone rings (4) with gradually changed diameters, the adjusting cone ring (4) with a large diameter is provided with a receiving groove (401) on the side close to the adjusting cone ring (4) with a small diameter, the adjusting cone ring (4) is slidably connected in the adjacent receiving groove (401) and the receiving groove (401) can completely accommodate the adjusting cone ring (4) with a small diameter; when the two groups of adjusting cone rings (4) are close to each other, the adjusting cone rings (4) are sequentially received in the receiving grooves (401) from the small-diameter ends; the circumferential side wall of the receiving groove (401) has an inwardly recessed annular space; a plurality of guide blocks (41) are circumferentially arranged on one side of the adjusting cone ring (4) in the receiving groove (401) through bolts, the outer ends of the guide blocks (41) are in contact with the outer circumferential side wall of the annular space; a spring (42) is arranged on the side of the adjusting cone ring (4) in the receiving groove (401), the spring (42) abuts against the receiving groove (401) and the spring force of the spring (42) gradually increases from the adjusting cone ring (4) with a small diameter to the adjusting cone ring (4) with a large diameter; the Venturi tube (3) further has smooth sections at the two ends of the converging sections and the diffusing sections; the inside of the two ends of the shell (1) is provided with an annular mounting groove (104), an inflatable sealing pad layer that is matched with the inner wall of the shell (1) is arranged in the mounting groove (104), the inflatable sealing pad layer is in contact with the outer side wall of the smooth section of the Venturi tube (3) to form a sealing structure; a pressurizing interface (102) is arranged on the outside of the shell (1) corresponding to the mounting groove (104), the pressurizing interface (102) is externally connected to a pressurizing device; the Venturi tube (3) is composed of a throat tube (32), a flexible transition section (33) and an end connecting tube (34); the throat tube (32) constitutes a throat, the flexible transition section (33) is arranged at the two ends of the throat tube (32) and constitutes converging sections and diffusing sections. characterized in that 2. The venturi mixer with adjustable flow restriction of claim 1, wherein: 3. The venturi mixer with adjustable flow restriction of claim 2, wherein: 4. The venturi mixer with adjustable flow restriction of claim 3, wherein: The end connecting pipes (34) are respectively installed at the distal ends of the two flexible transition sections (33) and constitute smooth sections, the end connecting pipes (34) can axially slide relative to the inside of the shell (1), and the flexible transition sections (33) can elastically deform to cooperate with the movement of the end connecting pipes (34); Support rings (35) are installed at the two ends of the outer side wall of the throat pipe (32), the outer side of the support ring (35) is in contact with the inside of the shell (1), and a sealing washer is arranged therebetween; The fuel injection holes (301) are communicated with the fuel channel (101) through the gap between the support rings (35).
5. The Venturi mixer with adjustable flow restriction of claim 4, wherein: The flexible transition sections (33), the support rings (35) and the inner wall of the shell (1) form a closed deformation compensation cavity (105); The inside of the deformation compensation cavity (105) is filled with a fluid medium, and the fluid medium has the characteristics of cold state shaping and hot state softening; A filling port (103) is installed on the outside of the shell (1), the filling port (103) is communicated with the deformation compensation cavity (105), and the fluid medium can be filled in the deformation compensation cavity (105) from the filling port (103).
6. The Venturi mixer with adjustable flow restriction of claim 5, wherein: Threaded sections (11) are arranged on the outside of the two ends of the shell (1); The end of the end connecting pipe (34) is provided with a detachable driving connecting piece (6), and the driving connecting piece (6) is screwed with the threaded section (11).
7. The Venturi mixer with adjustable flow restriction of claim 6, wherein: The outside of the end of the end connecting pipe (34) is provided with a convex ring (36); The driving connecting piece (6) comprises an internally threaded sleeve (61) and a pressing ring (62); The internally threaded sleeve (61) and the pressing ring (62) are connected by bolts, and the convex ring (36) is clamped therebetween; The inside of the internally threaded sleeve (61) is screwed with the threaded section (11).
8. The Venturi mixer with adjustable flow restriction of claim 7, wherein: An installation lug (341) is installed on the end of the end connecting pipe (34) close to the flexible transition section (33); One side of the largest size diameter adjusting cone ring (4) in each group of adjusting cone rings (4) is provided with a linkage ring (5) through bolts, the circumferential outside of the linkage ring (5) is provided with a connecting part (51), the connecting part (51) and the installation lug (341) are connected by bolts, and there is a gap between the adjusting cone ring (4), the linkage ring (5) and the inner wall of the Venturi tube (3).
9. A method of operating a venturi mixer with adjustable flow restriction as claimed in claim 8, characterised in that, The method comprises the following steps: Step one, the adjusting cone ring (4) is pre-assembled in the Venturi tube (3), then the Venturi tube (3) is assembled in the shell (1), finally the driving connecting piece (6) is assembled on the shell (1), the small size diameter ends of the two groups of adjusting cone rings (4) preliminarily abut at the throat (31), and it is ensured that the fuel injection holes (301) are located in the connection area of the two groups of adjusting cone rings (4); Step two, according to the rated working condition requirement, the internally threaded sleeve (61) is rotated to drive the axial movement of the end connecting pipe (34), the two groups of adjusting cone rings (4) are relatively close or far away, the extension degree of the two groups of adjusting cone rings (4) is adjusted, the flow passage cross section size of the connection area of the throat pipe (32) and the adjusting cone ring (4) is determined, and the rated flow matching is realized. Step three, connect the connecting seat (2) in the mixer with the fuel pipeline, connect the end connecting pipe (34) with the air pipeline through the flange and the hose, fill the installation groove (104) with the gas of preset pressure through the pressure filling interface (102), make the inflatable sealing pad layer expand and tightly adhere to the outer side wall of the end connecting pipe (34), and form reliable sealing; Step four, inject a preset amount of fluid medium into the deformation compensation cavity (105) through the filling port (103), select the cold setting hardness of the fluid medium according to the working temperature requirement, and then close the filling port (103); Step five, the fuel enters the fuel channel (101) through the connecting seat (2), is sprayed into the inside of the venturi (3) through the spiral tangential fuel injection holes (301) around the throat (31), and forms a spiral mixed gas flow with the air, improving the mixing uniformity.