Turbine type flow sensor

Abstract

A turbine type flow sensor is provided with a main water pipe, the upper end and the lower end of the main water pipe are closed, so that a metering cabin is formed in the main water pipe, a turbine is arranged in the middle of the metering cabin, a magnet is arranged in the turbine, and a water inlet pipe transversely communicated with the upper portion of the metering cabin and a water outlet pipe transversely communicated with the lower portion of the metering cabin are arranged on one side of the main water pipe. The other side of the main water pipe is provided with a detection circuit matched with the magnet; a first conical groove located above the turbine and a second conical groove located below the turbine are formed in the metering cabin, and the first conical groove and the second conical groove are coaxially aligned; the upper end of a rotating shaft of the turbine forms a first conical part with the taper smaller than that of the first conical groove, and the lower end of the rotating shaft of the turbine forms a second conical part with the taper smaller than that of the second conical groove. The rotating shaft of the turbine always takes the cone top of the first cone part and the cone top of the second cone part as a supporting point, the rotating friction is greatly reduced in a point contact mode, the rotation starting of the turbine is accelerated, the stable rotating speed is achieved, and the response speed and the detection precision of flow detection are improved.

Description

Technical Field

[0001] This utility model relates to the field of flow measurement and sensing technology, specifically a turbine-type flow sensor. Background Technology

[0002] In existing technologies, turbines are commonly used to measure flow rate. The force of the fluid causes the turbine to rotate after overcoming frictional torque and fluid resistance. The turbine speed stabilizes after torque balance and is proportional to the flow velocity. At this point, the turbine speed is recorded by magnetic or mechanical devices, thereby calculating the flow velocity and flow rate.

[0003] One type of turbine flow detection device has a permanent magnet embedded in the turbine to form a magnetic rotor inside, while the detection circuit is constructed with coils or Hall effect devices on the outside. When the fluid drives the turbine to rotate, the magnetic rotor rotates accordingly. Its magnetic field periodically cuts the magnetic field lines of the externally fixed coil or Hall effect sensor, thereby causing the coil to generate a pulse voltage signal or the Hall effect device to output a square wave signal, which is used as the basis for measurement calculation.

[0004] Clearly, the speed at which the turbine starts and reaches a stable rotational speed directly affects the response speed of the flow detection device. Simultaneously, the magnitude of the frictional torque on the turbine shaft during rotation also directly affects the detection accuracy of the flow detection device.

[0005] In order to improve the response speed and detection accuracy of turbine flow sensors, the applicant has continuously researched and improved the structure of existing turbine flow sensors in long-term production practice, in order to obtain a turbine flow sensor with improved response speed and detection accuracy. Utility Model Content

[0006] This utility model aims to meet the above-mentioned needs of the prior art and provides a turbine-type flow sensor with improved response speed and detection accuracy. The technical solution is as follows.

[0007] The turbine-type flow sensor has a main water pipe, which is closed at both ends to form a metering chamber inside. A turbine is located in the middle of the metering chamber, and a magnet is installed inside the turbine. One side of the main water pipe has an inlet pipe that flows horizontally into the upper part of the metering chamber and an outlet pipe that flows horizontally into the lower part of the metering chamber. The other side of the main water pipe has a detection circuit for cooperating with the magnet.

[0008] The metering chamber is equipped with a first conical groove located above the turbine and a second conical groove located below the turbine, with the first and second conical grooves coaxially aligned.

[0009] The upper end of the turbine shaft forms a first conical part with a taper smaller than the first conical groove, and the lower end of the turbine shaft forms a second conical part with a taper smaller than the second conical groove;

[0010] The distance between the cone apexes of the first and second conical grooves is the first length, the distance between the rightmost end of the cone bottom of the second conical groove and the leftmost end of the cone bottom of the second conical groove is the second length, and the distance between the cone apexes of the first and second cones is the third length. The third length is greater than the second length and less than the first length.

[0011] As an improvement, the height of the first cone is greater than the height of the first conical groove, and the height of the second cone is greater than the height of the second conical groove.

[0012] As an improvement, a removable plug is provided at the lower end of the main water pipe, and a second conical groove is provided on the top surface of the plug.

[0013] As an improvement, the upper part of the metering chamber is provided with a grid support, and the first conical groove is located on the bottom surface of the grid support.

[0014] As an improvement, the turbine shaft and magnet are integrally molded with the turbine blades using an insert injection molding method.

[0015] As an improvement, the lower end face of the turbine blade forms a circular groove coaxial with the shaft, and the magnet is a ring magnet that is embedded in the circular groove to form a fixed connection.

[0016] As an improvement, the section where the turbine shaft and blades meet has a textured surface with raised and recessed patterns.

[0017] As an improvement, a component compartment is formed on the outer wall of the main water pipe, and the detection circuit is sealed inside the component compartment with epoxy resin.

[0018] As an improvement, a first U-shaped bracket extending backward is provided at the junction of the inlet pipe and the main water pipe, and a second U-shaped bracket extending backward is provided at the junction of the outlet pipe and the main water pipe.

[0019] As an improvement, a support plate is connected between the inlet pipe and the outlet pipe, and a screw guide sleeve is provided on the support plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The turbine shaft will always use the cone apex of the first and second cones as support points. By using point contact, rotational friction is greatly reduced, the turbine starts up and reaches a stable speed, and the response speed and detection accuracy of flow detection are improved.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1.

[0024] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2

[0025] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0026] Figure 4 This is a schematic diagram of the metering chamber in this utility model.

[0027] Figure 5 This is a schematic diagram of the turbine structure in this utility model.

[0028] Figure 6 This is an exploded view of the turbine structure in this utility model.

[0029] Figure 7 This is a schematic diagram of the structure of the grid support in this utility model.

[0030] Figure 8 This is a schematic diagram illustrating the working principle of this utility model. Detailed Implementation

[0031] Please see Figures 1 to 7 As shown, in one embodiment, the turbine-type flow sensor of this utility model is provided with a main water pipe 1. The upper and lower ends of the main water pipe 1 are closed to form a metering chamber 10 inside. A turbine 2 is provided in the middle of the metering chamber 10, and a magnet 3 is provided inside the turbine 2. One side of the main water pipe 1 has an inlet pipe 4 that flows laterally into the upper part of the metering chamber 10 and an outlet pipe 5 that flows laterally into the lower part of the metering chamber 10. The other side of the main water pipe 1 has a detection circuit (not shown) for cooperating with the magnet 3.

[0032] The metering chamber 10 is provided with a first conical groove 11 located above the turbine 2 and a second conical groove 12 located below the turbine 2. The first conical groove 11 and the second conical groove 12 are coaxially aligned.

[0033] The upper end of the turbine shaft of the turbine 2 forms a first conical portion 21 with a taper smaller than that of the first conical groove 11, and the lower end of the turbine shaft of the turbine 2 forms a second conical portion 22 with a taper smaller than that of the first conical groove 12.

[0034] Specifically, the distance between the cone apex of the first conical groove 11 and the second conical groove 12 is the first length L1, the distance between the rightmost end of the cone bottom of the first conical groove 11 and the leftmost end of the cone bottom of the second conical groove 12 is the second length L2, and the distance between the cone apex of the first cone 21 and the second cone 22 is the third length L3. The third length L3 is greater than the second length L2 and less than the first length L1.

[0035] In the above embodiment, the turbine 2's shaft is not assembled using a traditional bearing structure. Specifically, as follows... Figure 3 As shown, given that the third length L3 is greater than the second length L2 and less than the first length L1, the upper end of the turbine 2 shaft is always movable within the first conical groove 11, and the lower end of the turbine 2 shaft is always movable within the first conical groove 12.

[0036] As water flows along the inlet pipe-metering chamber-outlet pipe, turbine 2 rotates under the impact of the water flow. The lower end of the turbine 2's shaft makes point contact with the inner wall of the first conical groove 12 through the cone apex of the second cone 22. When the turbine 2's shaft tilts due to the impact of the water flow, the upper end of the turbine 2's shaft also makes point contact with the inner wall of the first conical groove 11 through the cone apex of the first cone 21. In short, with the cooperation of the first conical groove 11 and the first conical groove 12, turbine 2 will always maintain a generally vertical shaft orientation and have a small range of axial degrees of freedom.

[0037] Obviously, in the above embodiment, when the turbine 2 rotates under the impact of the water flow, it will always use the cone apex of the first cone 21 and / or the second cone 22 as the support point. By using point contact, the rotational friction is greatly reduced, the turbine 2 starts to rotate and reaches a stable speed, and the response speed and detection accuracy of the flow detection are improved.

[0038] Based on the above implementation, the height of the first cone 21 is greater than the height of the first cone groove 11, and the height of the second cone 22 is greater than the height of the first cone groove 12.

[0039] Based on the above implementation method, the lower end of the main water pipe 1 is provided with a removable plug 6, and the second conical groove 12 is provided on the top surface of the plug 6. During assembly and maintenance, the metering chamber 10 can be opened by removing the plug 6 to allow the turbine 2 to be placed or removed, and also to facilitate cleaning of the chamber.

[0040] Based on the above embodiment, a grid support 13 is provided on the upper part of the metering chamber 10, and a first conical groove 11 is provided on the bottom surface of the grid support 13. The grid support 13 has a grid structure, which not only provides a structural foundation for the first conical groove 11, but also ensures smooth water flow.

[0041] Based on the above implementation method, the turbine 2's shaft and magnet 3 are integrally formed with the turbine 2's blades by insert injection molding, making the turbine 2's blades, shaft, and magnet 3 an integral structure with excellent structural strength and significantly enhanced service life.

[0042] Preferably, when the turbine 2's shaft and magnet 3 are integrally molded with the turbine 2's blades via insert injection molding, a circular groove 23 coaxial with the shaft is formed on the lower end face of the turbine 2's blades. The magnet 3 is an annular magnet 3 that is embedded in the circular groove 23 to form a fixed fit. This arrangement, on the one hand, places the magnet 3 at the water outlet, avoiding repeated impacts from the water flow that could cause the magnet 3 to loosen; on the other hand, it ensures that the mass of the turbine 2 is evenly distributed circumferentially, which can significantly suppress vibrations that occur when the turbine 2 rotates, reducing the risk of high-frequency vibrations causing the magnet 3 to demagnetize.

[0043] Preferably, the section where the shaft of the turbine 2 is joined to the blade has a textured surface 24 on its outer circumference, which enhances the joint strength between the shaft and the blade.

[0044] Based on the above embodiment, a component compartment 7 is formed on the outer wall of the main water pipe 1, and the detection circuit is sealed inside the component compartment 7 with epoxy resin. Since the detection circuit is not an improvement of this utility model, and those skilled in the art can directly apply known detection circuit designs to this utility model, the specific structure of the detection circuit will not be described in detail.

[0045] Based on the above implementation method, a first U-shaped bracket 81 extending backward is provided at the junction of the water inlet pipe 4 and the main water pipe 1, and a second U-shaped bracket 82 extending backward is provided at the junction of the water outlet pipe 5 and the main water pipe 1. The first U-shaped bracket 81 and the second U-shaped bracket 82 can serve as hangers to support the corresponding installation methods.

[0046] Based on the above implementation method, a support plate 9 is connected between the water inlet pipe 4 and the water outlet pipe 5, and a screw guide sleeve 91 is provided on the support plate 9. Screws can be passed through the screw guide sleeve 91 and connected to an external mechanism to assist in installation.

[0047] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A turbine flow sensor, comprising a main water pipe, the upper and lower ends of the main water pipe being closed to form a metering chamber inside, a turbine being arranged in the middle of the metering chamber, a magnet being arranged in the turbine, a water inlet pipe being arranged on one side of the main water pipe to extend transversely into the upper part of the metering chamber, a water outlet pipe being arranged on the other side of the main water pipe to extend transversely into the lower part of the metering chamber, and a detection circuit being arranged on the other side of the main water pipe to cooperate with the magnet; characterized in that: a first conical groove is arranged above the turbine in the metering chamber, and a second conical groove is arranged below the turbine in the metering chamber, the first and second conical grooves being coaxially aligned; the upper end of the rotating shaft of the turbine is formed with a first taper portion having a smaller taper than the first conical groove, and the lower end of the rotating shaft of the turbine is formed with a second taper portion having a smaller taper than the second conical groove; the distance between the top of the first conical groove and the top of the second conical groove is a first length, the distance between the rightmost end of the bottom of the second conical groove and the leftmost end of the bottom of the second conical groove is a second length, and the distance between the top of the first taper portion and the top of the second taper portion is a third length, the third length being greater than the second length and smaller than the first length. The height of the first taper portion is greater than the height of the first conical groove, and the height of the second taper portion is greater than the height of the second conical groove. The lower end of the main water pipe is provided with a removable plug, and the second conical groove is arranged on the top surface of the plug. The upper part of the metering chamber is provided with a grid support, and the first conical groove is arranged on the bottom surface of the grid support. The rotating shaft and the magnet of the turbine are integrally formed with the blades of the turbine by insert molding.

2. The turboflow® flow sensor of claim 1, wherein: The lower end surface of the blades of the turbine is formed with a circular embedding groove coaxial with the rotating shaft, and the magnet is an annular magnet embedded in the circular embedding groove to form a fixed connection.

3. The turboflow® flow sensor of claim 1, wherein: The section where the rotating shaft of the turbine is combined with the blades is formed with concave-convex patterns on the outer cylindrical surface.

4. The turboflow® flow sensor of claim 1, wherein: An element chamber is formed on the outer wall of the main water pipe, and the detection circuit is sealed in the element chamber by epoxy resin.

5. The turboflow sensor of claim 1, wherein: A first U-shaped support extending rearward is arranged at the joint between the water inlet pipe and the main water pipe, and a second U-shaped support extending rearward is arranged at the joint between the water outlet pipe and the main water pipe.

6. The turboflow sensor of claim 1, wherein: A support plate is connected between the water inlet pipe and the water outlet pipe, and screw guide sleeves are arranged on the support plate.

7. The turboflow sensor of claim 6, wherein: ​ 8. The turboflow sensor of claim 1, wherein: ​ 9. The turboflow sensor of claim 1, wherein: ​ 10. The turboflow sensor of claim 1, wherein: ​

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