A dual helix turbine flowmeter

Abstract

The utility model relates to the field of flowmeter discloses a double helix turbine flowmeter, including inner tube, the inner wall of casing is arranged to the inner tube, the both ends of casing all are clamped and have gland, the inner wall rotatable of inner tube has double helix impeller, the both ends of double helix impeller all are fixed with small axle, the outer wall of double helix impeller is embedded with a plurality of magnet, the left end of inner tube is clamped and has first support, the right end of inner tube is clamped and has second support, the inner wall of first support and second support all are fixed with graphite axle sleeve, the inner wall rotatable of small axle is arranged in graphite axle sleeve, the end of small axle rotatable is provided with steel ball, the end of graphite axle sleeve is provided with gasket, gasket and steel ball contact, the inner wall of first support and second support all are provided with spring, the one end of spring and gasket abut, the inner wall of first support and second support all are screw -threaded and are connected with guide bolt.

Description

Technical Field

[0001] This utility model relates to the technical field of flow meters, specifically a double-spiral turbine flow meter. Background Technology

[0002] A turbine flow meter is a velocity-type flow meter with temperature and pressure compensation functions. It is a type of velocity flow meter that uses the power of the flowing fluid to drive the turbine blades to rotate. The rotational speed is approximately proportional to the volumetric flow rate, and the fluid volume reading of the flow meter is based on the turbine impeller rotation speed. Turbine flow meters are characterized by high measurement accuracy, good repeatability and stability, wide measurement range, rapid response to flow changes, strong anti-interference ability, and easy signal transmission.

[0003] In fields such as petrochemicals and military equipment, flow measurement is a crucial link in ensuring operational efficiency and cost control. Military equipment, especially armored vehicles, has particularly high requirements for metering accuracy, equipment mobility, and adaptability to harsh environments during refueling.

[0004] In the existing technology, the metering is achieved by relying on the rotation of a multi-bladed rotor and the correspondence between speed and flow rate. However, this technology still has the following drawbacks: the use of a surface contact fit between a common metal bushing and a small shaft results in direct metal-to-metal friction with a high coefficient of friction. During rotation, local stress concentration occurs, and after long-term operation, the bushing and small shaft wear severely. Slight deformation can easily cause impeller jamming, disrupting the linear correspondence between speed and flow rate. Utility Model Content

[0005] The purpose of this invention is to provide a double-spiral turbine flow meter to solve the problems of using a common metal bushing and a small shaft for surface contact, resulting in direct metal-to-metal friction, a high coefficient of friction, local stress concentration during rotation, severe wear of the bushing and small shaft after long-term operation, and impeller jamming due to slight deformation, thus disrupting the linear relationship between speed and flow.

[0006] To achieve the aforementioned utility model objectives, the present utility model adopts the following technical solution: a double-helix turbine flow meter, comprising an inner cylinder disposed on the inner wall of a housing, with pressure caps snapped onto both the left and right ends of the housing, a double-helix impeller rotatably disposed on the inner wall of the inner cylinder, with small shafts fixed to both the left and right ends of the double-helix impeller, and a plurality of magnets embedded in the outer wall of the double-helix impeller, a first bracket snapped onto the left end of the inner cylinder, and a second bracket snapped onto the right end of the inner cylinder, with stones fixed to the inner walls of both the first and second brackets. The graphite bushing has a small shaft rotatably mounted on its inner wall. A steel ball is rotatably mounted at the end of the small shaft. A washer is mounted at the end of the graphite bushing, and the washer contacts the steel ball. Springs are mounted on the inner walls of both the first and second supports, with one end of the spring abutting against the washer. Guide bolts are threaded onto the inner walls of both the first and second supports, with the other end of the spring contacting the guide bolts. A signal output device is mounted on the outer wall of the housing, and the sensing end of the signal output device extends to the inner cylinder.

[0007] Preferably, the magnet is magnetically coupled to the sensing end of the signal output device in a non-contact manner.

[0008] Preferably, the gland has a plurality of fixing bolts inside, and the gland is connected to the housing by the fixing bolts.

[0009] Preferably, the flanges at both ends of the housing are provided with a number of positioning holes.

[0010] Preferably, sealing rings are embedded at both ends of the housing, and the sealing rings are in contact with the pressure cap.

[0011] Preferably, the first and second supports are cross-shaped hollow structures, and the first and second supports are aligned with the double helical impeller along the same axis.

[0012] Compared with existing technologies, a double-helix turbine flow meter adopting the above technical solution has the following beneficial effects:

[0013] First, through the synergistic action of the magnet, the first support, the second support, the graphite bushing, and the steel balls, the frictional force during the rotation of the double helix impeller and its small shaft can be reduced, ensuring a stable linear relationship between the impeller speed and fluid flow rate. This effectively prevents the impeller from jamming. Simultaneously, through the synergistic action of the shims, springs, and guide bolts, the contact pressure between the steel balls and the small shaft on the double helix impeller can be flexibly adjusted. This avoids excessive clearance that could cause the impeller to wobble and affect measurement, while also preventing excessive pressure that could hinder rotation, further ensuring measurement accuracy. Second, through non-contact magnetic coupling between the magnet and the sensing end of the signal output device, mechanical wear during signal acquisition is avoided, extending the service life of the magnet and the signal output device. Furthermore, this effectively reduces signal interference caused by mechanical contact, resulting in more stable signal transmission.

[0014] Second, the gland is threaded onto the housing, facilitating disassembly. When internal components such as the double helix impeller and graphite bushing show wear, the gland can be quickly removed for repair or replacement, reducing maintenance difficulty. The sealing ring fills the gap between the housing and the gland, forming a reliable sealing barrier that effectively prevents fuel leakage. It also blocks external dust, moisture, and other impurities from entering the flowmeter, preventing wear on core components like the double helix impeller and graphite bushing, thus ensuring the flowmeter's lifespan and operational stability. The cross-shaped hollow structure of the first and second supports securely fixes the graphite bushing, preventing deformation of the first and second supports during double helix impeller rotation. Coaxiality with the double helix impeller ensures it remains centered during rotation, preventing friction between the impeller and the inner cylinder wall. This extends the impeller's lifespan and avoids abnormal rotation caused by friction, further ensuring reliable metering. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of an embodiment.

[0016] Figure 2 This is a planar schematic diagram of the housing in an embodiment.

[0017] Figure 3 This is a planar schematic diagram of the inner cylinder in an embodiment.

[0018] Figure 4 This is a planar schematic diagram of the first support in an embodiment.

[0019] Figure 5 This is a planar schematic diagram of the second support in an embodiment.

[0020] Figure 6 This is a planar schematic diagram of the capping area in an embodiment.

[0021] In the diagram: 1. Inner cylinder; 2. Shell; 3. Gland; 4. Double helical impeller; 5. Small shaft; 6. Magnet; 7. First support; 8. Second support; 9. Graphite bushing; 10. Steel ball; 11. Gasket; 12. Spring; 13. Guide bolt; 14. Signal output device; 15. Fixing bolt; 16. Positioning hole; 17. Sealing ring. Detailed Implementation

[0022] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1-6 As shown, a double-helix turbine flow meter includes an inner cylinder 1, which is disposed on the inner wall of a housing 2. Both ends of the housing 2 are secured with pressure caps 3. A double-helix impeller 4 is rotatably mounted on the inner wall of the inner cylinder 1. Small shafts 5 are fixed to both ends of the double-helix impeller 4. Several magnets 6 are embedded in the outer wall of the double-helix impeller 4. A first bracket 7 is secured to the left end of the inner cylinder 1, and a second bracket 8 is secured to the right end. Graphite bushings 9 are fixed to the inner walls of both the first bracket 7 and the second bracket 8. The small shafts 5 are rotatably disposed on the inner wall of the graphite bushings 9, and the ends of the small shafts 5 are... The rotating part is equipped with a steel ball 10. A washer 11 is provided at the end of the graphite bushing 9. The washer 11 is in contact with the steel ball 10. A spring 12 is provided on the inner wall of the first bracket 7 and the second bracket 8. One end of the spring 12 abuts against the washer 11. A guide bolt 13 is threadedly connected to the inner wall of the first bracket 7 and the second bracket 8. The other end of the spring 12 is in contact with the guide bolt 13. A signal output device 14 is provided on the outer wall of the housing 2. The sensing end of the signal output device 14 extends to the inner cylinder 1. The magnet 6 is magnetically coupled to the sensing end of the signal output device 14 in a non-contact manner.

[0024] During use, the synergistic effect of magnet 6, first bracket 7, second bracket 8, graphite bushing 9, and steel ball 10 reduces the friction of the double helix impeller 4 and small shaft 5 during rotation, ensuring a stable linear relationship between the speed of the double helix impeller 4 and the fluid flow rate. This effectively prevents jamming of the double helix impeller 4. Simultaneously, the synergistic effect of shim 11, spring 12, and guide bolt 13 allows for flexible adjustment of the contact pressure between the steel ball 10 and the small shaft 5 on the double helix impeller 4. This avoids excessive clearance that could cause the double helix impeller 4 to wobble and affect measurement, while also preventing excessive pressure from hindering rotation, further ensuring measurement accuracy. The non-contact magnetic coupling between magnet 6 and the sensing end of signal output device 14 avoids mechanical wear during signal acquisition, extending the service life of magnet 6 and signal output device 14. It also effectively reduces signal interference caused by mechanical contact, resulting in more stable signal transmission.

[0025] like Figure 1 , Figure 2 and Figures 4-6As shown, the pressure cap 3 has several fixing bolts 15 inside, and the pressure cap 3 is connected to the housing 2 by the fixing bolts 15. Several positioning holes 16 are opened on the flanges at both ends of the housing 2. Sealing rings 17 are embedded at both ends of the housing 2, and the sealing rings 17 are in contact with the pressure cap 3. The first bracket 7 and the second bracket 8 are cross-shaped hollow structures, and the first bracket 7 and the second bracket 8 are in the same axial direction as the double helical impeller 4.

[0026] During use, the pressure cap 3 is threaded onto the housing 2, facilitating disassembly. When internal components of the flowmeter, such as the double helix impeller 4 and graphite bushing 9, show wear, the pressure cap 3 can be quickly disassembled for repair or replacement, reducing maintenance difficulty. The sealing ring 17 fills the gap between the housing 2 and the pressure cap 3, forming a reliable sealing barrier that effectively prevents fuel leakage. It also blocks external dust, moisture, and other impurities from entering the flowmeter, preventing wear on core components such as the double helix impeller 4 and graphite bushing 9, thus ensuring the flowmeter's service life and operational stability. The cross-shaped hollow structure of the first bracket 7 and the second bracket 8 securely fixes the graphite bushing 9, preventing deformation of the first and second brackets 7 and 8 when the double helix impeller 4 rotates. Coaxiality with the double helix impeller 4 ensures it remains centered during rotation, preventing friction between the double helix impeller 4 and the inner wall of the inner cylinder 1. This extends the service life of the double helix impeller 4 and avoids abnormal rotation caused by friction, further ensuring reliable metering.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A double-spiral turbine flow meter, comprising an inner cylinder (1) disposed on the inner wall of a housing (2), characterized in that, Both ends of the housing (2) are fitted with pressure caps (3). The inner wall of the inner cylinder (1) is rotatably equipped with a double helical impeller (4). Both ends of the double helical impeller (4) are fixed with small shafts (5). Several magnets (6) are embedded in the outer wall of the double helical impeller (4). The left end of the inner cylinder (1) is fitted with a first bracket (7). The right end of the inner cylinder (1) is fitted with a second bracket (8). The inner walls of the first bracket (7) and the second bracket (8) are fixed with graphite bushings (9). The small shafts (5) are rotatably mounted on the inner wall of the graphite bushings (9). The end of the small shafts (5) is rotatably mounted on the inner wall of the graphite bushings (9). There is a steel ball (10), and a gasket (11) is provided at the end of the graphite bushing (9). The gasket (11) is in contact with the steel ball (10). The inner walls of the first bracket (7) and the second bracket (8) are provided with springs (12). One end of the spring (12) abuts against the gasket (11). The inner walls of the first bracket (7) and the second bracket (8) are threaded with guide bolts (13). The other end of the spring (12) is in contact with the guide bolts (13). The outer wall of the housing (2) is provided with a signal output device (14). The sensing end of the signal output device (14) extends to the inner cylinder (1).

2. The double-spiral turbine flow meter according to claim 1, characterized in that: The magnet (6) is magnetically coupled to the sensing end of the signal output device (14) without contact.

3. The double-helix turbine flow meter according to claim 1, characterized in that: The pressure cap (3) is provided with several fixing bolts (15) inside, and the pressure cap (3) is connected to the housing (2) by the fixing bolts (15).

4. The double-spiral turbine flow meter according to claim 3, characterized in that: Several positioning holes (16) are provided on the flanges at the left and right ends of the housing (2).

5. A double-spiral turbine flow meter according to claim 4, characterized in that: Both ends of the housing (2) are fitted with sealing rings (17), and the sealing rings (17) are in contact with the pressure cap (3).

6. The double-spiral turbine flow meter according to claim 1, characterized in that: The first support (7) and the second support (8) are cross-shaped hollow structures, and the first support (7) and the second support (8) are on the same axis as the double helical impeller (4).

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