Flow adaptive opening and closing nozzle

Abstract

The present application relates to a kind of liquid flow standard device detection field flow adaptive opening and closing nozzle, to solve the unstable flow state of traditional commutator nozzle at small flow, narrow flow range and the problem of high cost of device construction.The technical scheme of its key points is: nozzle includes interface flange, short connection pipe, manifold and nozzle plate, it also includes flexible sleeve film fixed to the outside of nozzle plate and two duckbill plates symmetrically arranged outside flexible sleeve film, each duckbill plate is rotatably installed by pivot and the center of gravity is offset relative to pivot;When small flow, duckbill plate is inwardly clamped flexible sleeve film under the action of gravity to reduce outlet area, and when large flow, duckbill plate is outwardly spread under the action of fluid pressure to increase outlet area.The present application is mainly used for commutator of liquid flow standard device, realizes flow field rectification, flow state uniform distribution, improves the overall stability of device, expands flow range, reduces construction cost.

Description

Technical Field

[0001] This invention relates to the technical field of liquid flow standard device detection, and more particularly, to a flow adaptive opening and closing nozzle for the commutator of a liquid flow standard device, which is used for flow field rectification, uniform flow distribution, improving the overall stability of the device, and expanding the flow range. Background Technology

[0002] Liquid flow standard devices are key equipment used to calibrate various flow meters, with the commutator being its most crucial component. The overall performance of the commutator determines the uncertainty and stability of the device. The commutator consists of two main parts: the nozzle structure and the water distribution component. The nozzle structure determines the flow distribution and stability indicators. A good nozzle can maintain a stable flow distribution at both high and low flow rates; conversely, a poor nozzle may result in a full nozzle and uniform fluid distribution at high flow rates, but bias or turbulence may occur at low flow rates when the nozzle is deficient.

[0003] In conventional flow control devices, the nozzle is typically designed as follows: Figure 1 As shown, the system includes: interface flange 1', short connecting pipe 2', manifold 3', and nozzle plate 4'. Its working principle is as follows: The detected liquid medium is introduced into the manifold 3' through interface flange 1' and short connecting pipe 2', dispersed within the manifold 3', and then flows out through the elongated rectangular funnel-shaped nozzle plate 4'. Finally, the distributor at the bottom of the nozzle plate 4' directs the medium to the desired location. The length and width of the nozzle 4' are predetermined during design and manufacturing. At high flow rates, the liquid is essentially filled at the nozzle plate 4', resulting in uniform fluid distribution. However, when the flow rate decreases to an insufficient level to fill the nozzle plate 4', the fluid will flow down one side wall of the nozzle plate 4' or accumulate in the manifold 3'. Subsequently, at some point, airflow enters along one side of the nozzle plate 4', and the liquid is instantly discharged, forming a surging flow. This leads to unstable flow rates, failing to meet the stability requirements of the device.

[0004] Traditional commutator nozzles cannot guarantee the stability and consistency of the outflow at low flow rates. Common phenomena include: fluid bias to one side, flow along the nozzle plate causing surging, flow in short bursts, and fluid swirling at the nozzle orifice. These phenomena lead to poor flow stability and increased uncertainty in the commutator, ultimately necessitating a reduction in the flow range to meet the requirements of the liquid flow meter. Traditional nozzles typically correspond to a flow velocity of 5-6 m / s at high flow rates, with a flow ratio of approximately 10-15:1, meaning a lower limit velocity of 0.33-0.6 m / s. Traditional nozzles result in a narrow operating flow range and a high lower limit for low flow rates, leading to poor stability of the liquid flow meter at low flow points. Therefore, in device design, multiple commutators and corresponding electronic scales are often required to meet the testing range needs, thus increasing the construction cost of the device. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a flow adaptive opening and closing nozzle. This invention aims to solve the technical problems of unstable flow, fluid bias or surging caused by the inability of traditional commutator nozzles to fill the nozzle under low flow conditions, thereby improving the flow stability and uncertainty of the commutator. At the same time, it solves the technical problem that the device needs to be equipped with multiple commutators and electronic scales due to the narrow flow range of traditional nozzles, resulting in high construction costs.

[0006] The technical solution adopted by this invention to solve its technical problem is: a flow-adaptive opening and closing nozzle, including an interface flange, a short connecting pipe, a manifold, and a nozzle plate, and further including a flexible diaphragm and two duckbill plates; the flexible diaphragm is fixedly disposed outside the nozzle plate; the two duckbill plates are symmetrically disposed outside the flexible diaphragm, each duckbill plate is rotatably mounted via a rotating shaft, and the center of gravity of the duckbill plate is offset relative to the rotating shaft, so that the lower part of the duckbill plate clamps the flexible diaphragm inward under the action of gravity, thereby reducing the outlet area of ​​the nozzle; when the fluid pressure increases, the duckbill plates can be pushed outward by the fluid pressure, thereby increasing the outlet area of ​​the nozzle.

[0007] Furthermore, the flexible sleeve is a plastic sleeve, which is bonded and fixed to the outside of the nozzle plate by adhesive.

[0008] Furthermore, it also includes a pressure plate for pressing and fixing the flexible diaphragm to the nozzle plate.

[0009] Furthermore, the rotating shaft and the duckbill plate are integrally formed, and the duckbill plate is rotatably mounted on the nozzle plate or the pressure plate via the rotating shaft.

[0010] Alternatively, the rotating shaft is a separate part, fixedly mounted on the nozzle plate or the pressure plate, and the duckbill plate is rotatably sleeved on the rotating shaft.

[0011] Furthermore, the nozzle plate has a rectangular plate structure.

[0012] Furthermore, the lower part of the duckbill plate is thicker than its upper part, so that the center of gravity of the duckbill plate is offset relative to the pivot.

[0013] Alternatively, a counterweight may be provided at the lower part of the duckbill plate.

[0014] Furthermore, the thickness of the flexible sheath is 0.5 mm to 3 mm.

[0015] Furthermore, the outlet edge of the nozzle plate is rounded and chamfered.

[0016] This invention improves the flow distribution, enhances stability, and expands the flow range by refining the nozzle structure. This reduces the lower limit of measurable flow and widens the flow range that the commutator can adapt to, thereby reducing the construction cost of liquid flow devices.

[0017] Specifically, the present invention has the following beneficial effects: 1. Expanding the range of flow rates: This invention can reach the smallest measurable flow rate value, thereby significantly expanding the range of flow rates that the nozzle can use, overcoming the shortcomings of traditional nozzles with narrow flow ratios (about 10-15:1), and expanding the flow ratio range.

[0018] 2. Improved stability at low flow rates: By utilizing the automatic clamping principle of the duckbill plate's center of gravity offset, the nozzle remains fully filled in the cavity at low flow rates, improving the fluid flow distribution, making the fluid uniform and stable, and enhancing the stability of the liquid flow device at low flow points, thereby improving the overall performance of the device.

[0019] 3. Reduced device construction costs: By using the flow adaptive opening and closing nozzle of the present invention, the applicable flow range of a single commutator can be increased, thereby reducing the number of commutators and corresponding electronic scales required for the device, effectively reducing the construction cost of the liquid flow standard device and reducing construction costs. Attached Figure Description

[0020] 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the nozzle structure in a conventional flow device. Figure 1 ; Figure 2 This is a schematic diagram of the nozzle structure in a conventional flow device. Figure 2 ; Figure 3 This is a schematic diagram of the flow-adaptive opening and closing nozzle structure of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the flow-adaptive opening and closing nozzle structure of the present invention. Figure 2 ; Figure 5 yes Figure 3 Side view; Figure 6 This is a schematic diagram of the flow-adaptive opening and closing nozzle of the present invention under low flow conditions. Figure 1 ; Figure 7This is a schematic diagram of the flow-adaptive opening and closing nozzle of the present invention under low flow conditions. Figure 2 ; Figure 8 yes Figure 6 A magnified view of a portion of the image; Figure 9 This is a schematic diagram of the flow-adaptive opening and closing nozzle of the present invention under high flow conditions. Figure 1 ; Figure 10 This is a schematic diagram of the flow-adaptive opening and closing nozzle of the present invention under high flow conditions. Figure 2 ; Figure 11 yes Figure 9 A magnified view of a portion of the image; Figure 12 This is a schematic diagram of the duckbill plate.

[0022] The labels in the diagram are: 1', interface flange; 2', short pipe; 3', manifold; 4', nozzle plate; 1, interface flange; 2, short pipe; 3, manifold; 4, nozzle plate; 5, pressure plate; 6, flexible diaphragm; 7, duckbill plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0024] like Figure 3-12 As shown, this embodiment provides a flow-adaptive opening and closing nozzle, applied in the commutator of a liquid flow standard device. The nozzle includes an interface flange 1, a short connecting pipe 2, a manifold 3, a nozzle plate 4, a pressure plate 5, a flexible diaphragm 6, and two duckbill plates 7.

[0025] The duckbill plate 7 features an eccentric design, utilizing its own weight to generate rotational force. The interface flange 1 is located at the top and connects to the upper end of the short connecting pipe 2; the lower end of the short connecting pipe 2 connects to the top of the manifold 3; the bottom of the manifold 3 is fixedly connected to the upper end of the nozzle plate 4; the nozzle plate 4 is a rectangular plate structure with a flexible diaphragm 6 fitted around its outer periphery; the upper part of the flexible diaphragm 6 is pressed and fixed to the nozzle plate 4 by a pressure plate 5; two duckbill plates 7 are symmetrically arranged outside the flexible diaphragm 6, and each is rotatably mounted on the nozzle plate 4 or the pressure plate 5 via a rotating shaft. Specifically, the two rotating shafts can be respectively located on the central vertical lines of both sides of the nozzle plate 4.

[0026] A flexible diaphragm 6 is fixedly mounted on the outside of the nozzle plate 4. In one specific embodiment, the flexible diaphragm 6 is a plastic diaphragm, the thickness of which can be selected according to the actual flow range, for example, 0.5 mm to 3 mm. This plastic diaphragm is bonded and fixed to the outer surface of the nozzle plate 4 using an adhesive (such as an epoxy resin structural adhesive). To further strengthen the fixation, a pressure plate 5 is also provided, which presses the flexible diaphragm 6 tightly onto the nozzle plate 4. The pressure plate 5 can be connected to the nozzle plate 4 via screws or other fasteners. After installation, the flexible diaphragm 6 can confine the fluid, preventing it from overflowing from both sides.

[0027] It should be noted that the flexible diaphragm 6 wraps around the outside of the nozzle plate 4, and its perimeter is a fixed value. Under low flow conditions, the flexible diaphragm 6 is squeezed by the duckbill plate 7, extending in length but narrowing in width, resulting in a decrease in the overall flow area. Under high flow conditions, the duckbill plate 7 opens, the width of the flexible diaphragm 6 increases, and its length slightly shortens, thus expanding the flow area to approach the outlet area of ​​the nozzle plate 4 itself. This demonstrates that the flow area changes accordingly with the flow rate. Taking a flexible diaphragm 6 with a perimeter of 300mm as an example: when the two duckbill plates 7 are fully fitted, the equivalent width is 150mm, and the area approaches 0mm²; when the distance between the two sides is 10mm, the length is 140mm, and the flow area is approximately 1400mm²; when the distance between the two sides increases to 20mm, the length is 130mm, and the flow area further expands to 2600mm². This example visually reflects the change in outlet area as the opening of the duckbill plate 7 increases.

[0028] Two duckbill plates 7 are symmetrically arranged on the outside of the flexible membrane 6. Each duckbill plate 7 is rotatably mounted via a pivot. The key feature of the duckbill plate 7 is that its center of gravity is offset relative to the pivot, thereby generating an inward torque under the action of gravity, causing the lower part of the duckbill plate 7 to automatically clamp the flexible membrane 6 inward.

[0029] Regarding the connection between the rotating shaft and the duckbill plate 7, the present invention provides two parallel implementation methods: Implementation Method 1 (One-piece Molding): The rotating shaft and the duckbill plate 7 are integrally molded. That is, the upper or middle part of the duckbill plate 7 is integrally provided with a shaft head, which is rotatably installed in the corresponding shaft hole on the nozzle plate 4 or pressure plate 5. This structure has fewer parts and is simple to assemble.

[0030] Implementation Method 2 (Independent Part): The rotating shaft is an independent part, such as a metal pin. The rotating shaft is fixedly mounted on the nozzle plate 4 or pressure plate 5 (e.g., by interference fit or threaded fixation), and the duckbill plate 7 is provided with a corresponding shaft hole, and the duckbill plate 7 is rotatably sleeved on the rotating shaft.

[0031] Regardless of the installation method, the duckbill plate 7 can rotate freely around the pivot, and its center of gravity is located on one side of the pivot axis (biased towards the lower part of the duckbill plate).

[0032] To achieve the offset of the center of gravity of the duckbill plate 7, the present invention provides two parallel specific structures: Method A: The lower part of the duckbill plate 7 is designed to be thicker than its upper part. By changing its geometry, the center of gravity of the duckbill plate 7 naturally shifts downward, located in front of and below the axis of rotation (on the side closer to the nozzle outlet). This allows for gravity clamping without the need for additional parts.

[0033] Method B: A counterweight is provided at the lower part of the duckbill plate 7. The counterweight can be a metal block, embedded or glued to the inner or outer side of the lower part of the duckbill plate 7. By increasing the weight at the bottom, the center of gravity of the duckbill plate 7 is offset relative to the axis of rotation. This method allows for easy adjustment of the clamping force by adjusting the mass of the counterweight to accommodate different flow ranges.

[0034] To prevent the sharp edges of the nozzle plate 4 from cutting the flexible diaphragm 6 when clamped by the duckbill plate 7, in this embodiment, the outlet edge of the nozzle plate 4 is preferably designed with a rounded chamfer. Furthermore, the flexible diaphragm 6 itself is made of a material with a certain degree of elasticity and wear resistance, such as polyurethane or rubber, and has a uniform thickness to ensure that it is not easily damaged during repeated opening and closing.

[0035] Working principle: During installation, fix the entire nozzle assembly above the reversing device so that the nozzle outlet is aligned with the water distribution component.

[0036] See Figure 6 , Figure 7 and Figure 8 As shown, in the low-flow-rate condition: when the liquid flow rate is small, the pressure of the fluid on the duckbill plate 7 is small and insufficient to overcome the gravitational torque of the duckbill plate 7 itself. At this time, the two duckbill plates 7 rotate inward around the axis under the action of gravity, and their lower parts press against the flexible diaphragm 6, causing it to deform and shrink, and the equivalent outlet area of ​​the nozzle automatically decreases. Because the outlet area is smaller, even if the total flow rate entering the nozzle is very small, the nozzle cavity (i.e., the inside of the manifold 3 and the nozzle plate 4) can still be kept full of fluid, thus preventing air from flowing back from below, avoiding the fluid from sticking to one side of the nozzle plate 4 in an unfilled state and forming a biased flow, and also preventing the generation of surging. The fluid flows out from the narrowed outlet in a stable and uniform flow state.

[0037] See Figure 9 , Figure 10 and Figure 11As shown, in the high-flow-rate condition: when the liquid flow rate increases, the pressure of the fluid on the lower part of the duckbill 7 also increases. When the outward thrust generated by the fluid pressure exceeds the gravitational torque of the duckbill 7, the duckbill 7 is pushed outward, the flexible diaphragm 6 expands accordingly, and the nozzle outlet area automatically increases. At this time, the high-flow-rate fluid can pass through smoothly without generating excessive pressure drop. Simultaneously, with a larger outlet area, the fluid can still remain in a full state, and the flow pattern is stable.

[0038] Adaptive characteristics: The nozzle outlet area can be continuously and passively adjusted automatically according to the flow rate without the need for external power or control signals. At any flow rate point, the opening of the duckbill 7 can always reach an equilibrium position, keeping the nozzle cavity always full, thereby maintaining a stable and uniform flow pattern throughout the entire flow range (e.g., flow ratios up to 30:1 or even wider).

[0039] When the flow adaptive opening and closing nozzle of this invention is used in the commutator of a liquid flow standard device, actual testing shows that: the lower limit of the minimum flow rate can be reduced from the traditional 0.33-0.6 m / s to below 0.1 m / s, and the flow ratio can be extended to above 30:1; at the minimum flow rate, the stability of the flow pattern is significantly improved, and the uncertainty of the commutator is improved; due to the expanded flow range covered by a single commutator, the number of commutators and electronic scales required for the device is reduced, and the overall construction cost can be reduced by more than 30%.

[0040] Additionally, it should be noted that the nozzle of this invention is located at the end of the closed pipeline of the calibration device. The fluid flow rate is adjusted by regulating the opening of the pipeline valve. Although there is some back pressure at the nozzle, it is at a low level. The rotation of the duckbill plate 7 changes accordingly with the flow rate, achieving an adaptive effect through passive opening and closing. It relies solely on the eccentric gravity of the duckbill plate 7 to compress the flexible diaphragm 6. The flexible diaphragm 6 is mainly made of a composite material of polyurethane and non-woven fabric, and its structure is similar to a fire hose, not a common, easily aging and degradable plastic film. The change in liquid flow rate is continuous, and the frequency of change cannot reach the power frequency state, let alone exhibit high-frequency fluctuations. Furthermore, the clamping force comes only from the eccentric self-weight of the two duckbill plates 7.

[0041] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flow-adaptive opening and closing nozzle, comprising an interface flange (1), a short connecting pipe (2), a manifold (3), and a nozzle plate (4), characterized in that, Also includes: A flexible diaphragm (6) is fixedly disposed on the outside of the nozzle plate (4); Two duckbill plates (7) are symmetrically arranged outside the flexible membrane (6). Each duckbill plate (7) is rotatably mounted via a pivot, and the center of gravity of the duckbill plate (7) is offset relative to the pivot, so that the lower part of the duckbill plate (7) clamps the flexible membrane (6) inward under the action of gravity to reduce the outlet area of ​​the nozzle. When the fluid pressure increases, the duckbill plate (7) can be pushed outward by the fluid pressure to increase the outlet area of ​​the nozzle.

2. The flow rate adaptive opening and closing nozzle according to claim 1, characterized in that, The flexible sleeve (6) is a plastic sleeve, which is bonded and fixed to the outside of the nozzle plate (4) by adhesive.

3. A flow rate adaptive opening and closing nozzle according to claim 1 or 2, characterized in that, It also includes a pressure plate (5), which is used to press and fix the flexible film (6) onto the nozzle plate (4).

4. The flow rate adaptive opening and closing nozzle according to claim 3, characterized in that, The rotating shaft and the duckbill plate (7) are integrally formed. The duckbill plate (7) is rotatably mounted on the nozzle plate (4) or the pressure plate (5) via the rotating shaft.

5. A flow rate adaptive opening and closing nozzle according to claim 3, characterized in that, The rotating shaft is an independent part, fixedly installed on the nozzle plate (4) or the pressure plate (5), and the duckbill plate (7) is rotatably sleeved on the rotating shaft.

6. The flow rate adaptive opening and closing nozzle according to claim 1, characterized in that, The nozzle plate (4) is a rectangular plate structure.

7. A flow rate adaptive opening and closing nozzle according to claim 1, characterized in that, The lower part of the duckbill plate (7) is thicker than its upper part, so that the center of gravity of the duckbill plate (7) is offset relative to the pivot.

8. A flow rate adaptive opening and closing nozzle according to claim 1, characterized in that, The lower part of the duckbill plate (7) is provided with a counterweight.

9. A flow rate adaptive opening and closing nozzle according to claim 1, characterized in that, The thickness of the flexible sheath (6) is 0.5 mm to 3 mm.

10. A flow rate adaptive opening and closing nozzle according to claim 1, characterized in that, The outlet edge of the nozzle plate (4) is rounded and chamfered.

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