Piezoelectric turbine flowmeter

Abstract

The utility model provides a piezoelectric turbine flowmeter, and relates to the technical field of flowmeters. The piezoelectric turbine flowmeter comprises a shell, a rotatable turbine arranged in the shell, a first magnet arranged on turbine blades of the turbine, a first piezoelectric ceramic piece fixedly arranged relative to the shell and a second magnet arranged on the first piezoelectric ceramic piece. The first magnet and the second magnet attract or repel each other, so that the first piezoelectric ceramic piece deforms along with rotation of the turbine, and a flow detection signal is provided based on rotation of the turbine.

Description

Technical Field

[0001] This specification relates to the technical field of flow meters, specifically to a piezoelectric turbine flow meter. Background Technology

[0002] Turbine flow meters are a type of velocity flow meter that calculates flow rate by measuring the ratio of the turbine blade rotation speed to the fluid velocity. In some embodiments, the flowing fluid drives the turbine blades to rotate, and the rotation speed is approximately proportional to the volumetric flow rate. In some related embodiments, the turbine flow meter can convert the turbine blade rotation into electrical pulse signals using a magneto-electric induction converter (e.g., coils and magnets), which are then processed to obtain flow data.

[0003] However, turbine flow meters based on magnetoelectric induction converters exhibit response hysteresis. Furthermore, turbine flow meters based on magnetoelectric induction converters require the arrangement of coils and magnets, with the coils being relatively large, resulting in a large overall size for the turbine flow meter. Utility Model Content

[0004] This specification provides one or more embodiments of a piezoelectric turbine flow meter, comprising: a housing, a rotatable turbine disposed inside the housing, a first magnet disposed on the turbine blades of the turbine, a first piezoelectric ceramic plate fixedly disposed relative to the housing, and a second magnet disposed on the first piezoelectric ceramic plate; the first magnet and the second magnet attract or repel each other, so that the first piezoelectric ceramic plate deforms with the rotation of the turbine, thereby providing a flow detection signal based on the rotation of the turbine.

[0005] In some embodiments, the piezoelectric turbine flow meter further includes: a processor and a display instrument, wherein the processor is signal-connected to the first piezoelectric ceramic plate and is used to process the flow detection signal provided by the first piezoelectric ceramic plate; the display instrument is signal-connected to the processor and is used to display the rotational speed of the turbine and / or the flow rate of the fluid passing through the piezoelectric turbine flow meter based on the processed flow detection signal.

[0006] In some embodiments, the piezoelectric turbine flow meter further includes: a second piezoelectric ceramic plate fixedly disposed relative to the housing and a third magnet disposed on the second piezoelectric ceramic plate; the first magnet and the third magnet attract or repel each other, so that the second piezoelectric ceramic plate deforms with the rotation of the turbine, so as to provide current based on the rotation of the turbine.

[0007] In some embodiments, the piezoelectric turbine flow meter further includes: an energy conversion and storage device, which is electrically connected to the second piezoelectric ceramic plate and is used to store the current provided by the second piezoelectric ceramic plate; the energy conversion and storage device is electrically connected to the processor and / or the display instrument.

[0008] In some embodiments, the piezoelectric turbine flow meter further includes: a housing fixed to the outside of the housing, with an accommodating space formed between the housing and the housing; and the first piezoelectric ceramic sheet and / or the second piezoelectric ceramic sheet disposed within the accommodating space.

[0009] In some embodiments, the piezoelectric turbine flow meter further includes: a first piezoelectric ceramic plate holder for fixing the first piezoelectric ceramic plate and a second piezoelectric ceramic plate holder for fixing the second piezoelectric ceramic plate; both the first piezoelectric ceramic plate holder and the second piezoelectric ceramic plate holder include: two opposing clamping plates, wherein the end of the first piezoelectric ceramic plate or the end of the second piezoelectric ceramic plate is clamped between the two clamping plates.

[0010] In some embodiments, the turbine includes: a turbine shaft, turbine blades disposed on the turbine shaft, and a turbine support connected to the turbine shaft; the turbine blades are configured to rotate relative to the turbine shaft; and the turbine support is fixedly connected to the inner wall of the housing.

[0011] In some embodiments, the turbine support includes: an inner ring fixedly connected to the turbine shaft, an outer ring fixedly connected to the inner wall of the housing, and spokes connecting the inner ring and the outer ring.

[0012] In some embodiments, the turbine includes one turbine support, which is disposed on the front or rear side of the turbine blade in the fluid flow direction; or, the turbine includes two or more turbine supports, wherein two turbine supports are located on the front and rear sides of the turbine blade in the fluid flow direction.

[0013] In some embodiments, the outer edge of the turbine blade is provided with a slot for accommodating the first magnet.

[0014] The beneficial effects that the embodiments of this specification may bring include, but are not limited to: (1) the first piezoelectric ceramic sheet is elastically deformed by the first magnet and the second magnet, thereby forming a piezoelectric direct drive and direct signal conversion, with a fast response speed; (2) the thin sheet structure of the first piezoelectric ceramic sheet has a small thickness, which reduces the overall volume of the device. (3) A second piezoelectric ceramic sheet is provided, and the mechanical energy of the vibration of the second piezoelectric ceramic sheet is converted into electrical energy by the positive piezoelectric effect, thereby realizing the self-powered power supply of the equipment without the need for other external power sources; (4) The energy provided by the second piezoelectric ceramic sheet is stored by the energy conversion and storage device to continuously power the processor and display instruments, thereby achieving the purpose of energy saving, emission reduction and self-powered power supply; (5) The energy conversion and storage device supports pre-charging, which facilitates flow detection when the equipment is started; (6) The first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are arranged outside the housing by setting a cover to avoid the influence of the fluid on the circuit; (7) The cover forms an independent accommodating space for accommodating the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet relative to the housing, so as to facilitate the replacement of the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet and the maintenance of related circuits; (8) By setting the turbine support on the rear side of the fluid flow direction, the influence of the turbine support on the fluid flow rate is reduced and the detection accuracy is improved. It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced can be any one or a combination of the above, or any other possible beneficial effects. Attached Figure Description

[0015] Figure 1 This is a partial cross-sectional schematic diagram of a piezoelectric turbine flow meter according to some embodiments of this specification.

[0016] Figure 2 This is a schematic diagram of a piezoelectric turbine flow meter according to some embodiments of this specification.

[0017] Figure 3 This is a cross-sectional schematic diagram of a piezoelectric turbine flow meter according to some embodiments of this specification.

[0018] Figure 4 This is an axial direction schematic diagram of a piezoelectric turbine flow meter according to some embodiments of this specification.

[0019] Figure 5 This is a schematic diagram of the clamping plate of a piezoelectric turbine flow meter according to some embodiments of this specification.

[0020] Figure 6 This is a circuit diagram of the energy conversion and storage device of a piezoelectric turbine flow meter according to some embodiments of this specification.

[0021] Figure 7This is a structural schematic diagram of a piezoelectric turbine flow meter according to some embodiments of this specification.

[0022] In the diagram, the markings are: 1. Casing; 2. Turbine; 20. Turbine shaft; 21. Turbine blade; 22. Turbine support; 221. Inner ring; 222. Outer ring; 223. Spokes; 31. First magnet; 32. Second magnet; 33. Third magnet; 41. First piezoelectric ceramic sheet; 42. Second piezoelectric ceramic sheet; 5. Cover; 6. Clamping plate; 61. First plate structure; 62. Second plate structure. Detailed Implementation

[0023] To more clearly illustrate the technical solutions of the embodiments in this specification, the embodiments will be described in detail below with reference to the accompanying drawings. Obviously, the content described below are some examples or embodiments of this specification. For those skilled in the art, without creative effort, the technical solutions or means disclosed in this specification can be applied to other scenarios based on this technical content.

[0024] It should be understood that the terms "system," "device," "equipment," "part" and / or "component," "unit" and / or "module" used in this specification are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other words can achieve the same purpose, they may be replaced by other expressions.

[0025] Unless otherwise specified, the technical terms used to describe components, elements, etc. in this specification are not singular but may include plural. Generally speaking, terms such as "comprising" or "including" only indicate that explicitly identified steps, elements, or components are included, and these steps, elements, and components do not constitute an exclusive list, as the described method or apparatus may also include other steps or components.

[0026] In the description of this specification, it should be understood that the directional descriptions, such as up, down, front, back, left, and right, indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. These descriptions are for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this specification, unless otherwise expressly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in this specification in conjunction with the specific content of the technical solution.

[0027] An instrument used to measure instantaneous or cumulative flow rate is called a flow meter. Flow meters are one of the major categories of instruments in process automation instrumentation and devices, and they are widely used in various sectors of the national economy, including metallurgy, power, coal, chemical, petroleum, construction, and agriculture. Flow meters can be used to measure the flow rate of fluids passing through pipelines.

[0028] Flow meters can include velocity flow meters. Turbine flow meters belong to the velocity flow meter category. When the fluid being measured passes through a turbine flow meter, the turbine blades of the turbine flow meter rotate under the action of the fluid, and the rotational speed is proportional to or approximately proportional to the average flow velocity in the pipe. In some related embodiments, the turbine flow meter can convert the rotation of the turbine blades into an electrical pulse signal through a magneto-electric induction converter. For example, the turbine blades of the turbine flow meter rotate periodically, thereby cutting the magnetic lines of force generated by an electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating electromotive force signal, i.e., an electrical pulse signal, will be induced in the coil. The frequency of this electrical pulse signal is proportional to or approximately proportional to the flow rate of the fluid being measured. The flow rate data is obtained by processing this electrical pulse signal.

[0029] However, turbine flow meters based on magnetoelectric induction converters suffer from response hysteresis. Furthermore, these flow meters require coils and magnets, with the coils being relatively large, resulting in a bulky overall size.

[0030] Based on this, one or more embodiments of this specification provide a piezoelectric turbine flow meter that provides flow detection signals based on the piezoelectric effect with low response hysteresis. Furthermore, it achieves the piezoelectric effect through a magnet arranged on the turbine blades and a first piezoelectric ceramic plate, resulting in a smaller overall volume compared to a coil arrangement.

[0031] Figure 1 This is a partial cross-sectional schematic diagram of a piezoelectric turbine flow meter according to some embodiments shown in this specification. Figure 2 This is a schematic diagram of a piezoelectric turbine flow meter according to some embodiments shown in this specification. Figure 3 This is a cross-sectional schematic diagram of a piezoelectric turbine flow meter according to some embodiments shown in this specification. Figure 4 This is a schematic diagram of the axial direction of a piezoelectric turbine flow meter according to some embodiments of this specification. See also Figures 1 to 4As shown, in one or more embodiments of this specification, a piezoelectric turbine flow meter may include: a housing 1, a rotatable turbine 2 disposed inside the housing 1, a first magnet 31 disposed on the turbine blades 21 of the turbine 2, a first piezoelectric ceramic sheet 41 fixedly disposed relative to the housing 1, and a second magnet 32 ​​disposed on the first piezoelectric ceramic sheet 41. In some embodiments, the first magnet 31 and the second magnet 32 ​​attract or repel each other, causing the first piezoelectric ceramic sheet 41 to deform with the rotation of the turbine 2, thereby providing a flow detection signal based on the rotation of the turbine 2. In some embodiments, the housing 1 is made of a non-magnetic material. In some embodiments, the first piezoelectric ceramic sheet 41 may be a sheet-like structure. In some embodiments, the first magnet 31 and the second magnet 32 ​​are high-magnetic magnets, such as neodymium magnets. Exemplarily, the first magnet 31 and the second magnet 32 ​​have the same magnetic poles and repel each other, and the second magnet 32 ​​moves outward (e.g., moves away from the turbine 2) thereby deforming the first piezoelectric ceramic sheet 41. In some embodiments, the first magnet 31 and the second magnet 32 ​​are held on the same radial plane of the housing 1 to increase the interaction force between the first magnet 31 and the second magnet 32.

[0032] In some embodiments, at least a portion of the housing 1 is configured as a tubular structure extending through both ends. When the fluid being measured passes through the housing 1, the turbine blades 21 of the turbine 2 rotate under force, and their rotational speed is proportional to or approximately proportional to the average flow velocity in the pipe. In some embodiments, the periodic rotation of the turbine blades 21 of the turbine 2 causes periodic deformation of the first piezoelectric ceramic sheet 41, such as periodic bending vibration or periodic expansion and contraction, thereby generating an electrical pulse signal based on the positive piezoelectric effect of the first piezoelectric ceramic sheet 41. In some embodiments, the electrical pulse signal may include a voltage signal. In some embodiments, the electrical pulse signal may include a current signal. In some embodiments, the fluid being measured may be a gas. In some embodiments, the fluid being measured may be a liquid.

[0033] In some embodiments, when the turbine blades 21 of the turbine 2 rotate, the first magnet 31 on the turbine blades 21 passes by the second magnet 32 ​​fixed on the first piezoelectric ceramic sheet 41, thereby applying a first force to the first piezoelectric ceramic sheet 41 through the second magnet 32 ​​to cause deformation of the first piezoelectric ceramic sheet 41. In some embodiments, the aforementioned first force can be an attractive force or a repulsive force. In some embodiments, as the turbine blades 21 rotate periodically under the action of the fluid being measured, the first piezoelectric ceramic sheet 41 correspondingly undergoes periodic deformation, thereby providing an electrical pulse signal. During the rotation of the turbine blades 21, the first piezoelectric ceramic sheet 41 undergoes multiple deformation-recovery cycles, and the surface polarization charge changes periodically accordingly, forming an alternating potential difference (i.e., a voltage signal). In some embodiments, when the external circuit is closed, the charge flow generates an alternating current (i.e., a current signal).

[0034] In some embodiments, within a certain flow range, the frequency of the electrical pulse signal is proportional to the turbine's rotational speed, that is, proportional to the flow rate.

[0035] In some embodiments, the first piezoelectric ceramic sheet 41 and the second magnet 32 ​​thereon can be arranged outside the housing 1 to prevent the measured fluid, such as liquid, inside the housing 1 from affecting the relevant circuitry of the first piezoelectric ceramic sheet 41.

[0036] In some embodiments, a first magnet 31 may be disposed on the outer edge of a turbine blade 21 such that the first magnet 31 is close to a second magnet 32 ​​located outside the housing 1. In some embodiments, a groove for receiving the first magnet 31 is formed on the outer edge of the turbine blade 21. In some embodiments, the first magnet 31 may be arranged on one or more of a plurality of turbine blades 21. In other embodiments, the first magnet 31 may be arranged on all turbine blades 21.

[0037] In some embodiments, see Figure 7 As shown, the piezoelectric turbine flow meter further includes a processor connected to the first piezoelectric ceramic plate 41 for processing the flow detection signal provided by the first piezoelectric ceramic plate 41. In some embodiments, the processor may include an amplifier for amplifying the electrical pulse signal provided by the first piezoelectric ceramic plate 41 to address the problem of low amplitude of the original electrical pulse signal, ensuring that the amplified electrical pulse signal can be effectively recognized by subsequent circuits or devices. In some embodiments, the amplifier may include an integrated filter circuit for eliminating high-frequency noise (e.g., electromagnetic interference or mechanical vibration noise) and improving the signal-to-noise ratio. In some embodiments, the processor is also used to convert the frequency of the amplified and / or filtered electrical pulse signal into flow data.

[0038] In some embodiments, see Figure 7 As shown, the piezoelectric turbine flow meter further includes a display instrument connected to a processor for displaying the rotational speed of the turbine 2 and / or the flow rate of the fluid passing through the piezoelectric turbine flow meter based on a processed flow detection signal (e.g., an amplified and / or filtered electrical pulse signal, or, for example, flow data converted by the processor). In some embodiments, the display instrument can display the turbine rotational speed, instantaneous flow rate, and cumulative flow rate in real time via a digital interface.

[0039] In some related embodiments, the turbine flow meter can be powered by a chemical battery, for example, to power its amplifiers, display instruments, and other functional units. However, in some implementations, chemical batteries (e.g., dry cell batteries or lithium batteries) have limited lifespans, and the turbine flow meter operates in high-humidity environments, posing a risk of battery leakage and making it difficult to achieve the expected battery lifespan. Replacing the batteries is also relatively cumbersome. In some related embodiments, the turbine flow meter can also be powered by traditional fossil fuels, but fossil fuels are increasingly depleted and pose serious environmental pollution problems. The piezoelectric turbine flow meter provided in one or more embodiments of this specification can also provide self-powered functionality (e.g., amplifiers, display instruments, etc.) based on the piezoelectric effect.

[0040] In one or more embodiments of this specification, the piezoelectric turbine flow meter may further include: a second piezoelectric ceramic sheet 42 fixedly disposed relative to the housing 1 and a third magnet 33 disposed on the second piezoelectric ceramic sheet 42. In some embodiments, the first magnet 31 and the third magnet 33 attract or repel each other, causing the second piezoelectric ceramic sheet 42 to deform with the rotation of the turbine 2 to provide current based on the rotation of the turbine 2. In some embodiments, an energy conversion and storage device is electrically connected to a processor and / or display instrument to power the processor and / or display instrument. In some embodiments, the second piezoelectric ceramic sheet 42 may be a sheet-like structure. In some embodiments, the third magnet 33 is a highly magnetic magnet, such as a neodymium magnet. Exemplarily, the first magnet 31 and the third magnet 33 have the same magnetic poles and repel each other, and the third magnet 33 moves outward (e.g., away from the turbine 2) to deform the second piezoelectric ceramic sheet 42. In some embodiments, the first magnet 31 and the third magnet 33 are held on the same radial plane of the housing 1 to increase the interaction force between the first magnet 31 and the third magnet 33.

[0041] In some embodiments, when the turbine blades 21 of the turbine 2 rotate, the first magnet 31 on the turbine blades 21 passes a third magnet 33 fixed to the second piezoelectric ceramic sheet 42, thereby applying a second force to the second piezoelectric ceramic sheet 42 through the third magnet 33, causing deformation of the second piezoelectric ceramic sheet 42. In some embodiments, the aforementioned second force can be an attractive force or a repulsive force. In some embodiments, as the turbine blades 21 rotate periodically under the action of the measured fluid, the second piezoelectric ceramic sheet 42 undergoes periodic deformation accordingly. During the rotation of the turbine blades 21, the second piezoelectric ceramic sheet 42 undergoes one or more deformation-recovery cycles, and the surface polarization charge changes periodically accordingly, forming an alternating potential difference, thereby generating an alternating current in the closed circuit, thus providing electrical energy.

[0042] In some embodiments, the piezoelectric turbine flow meter further includes an energy conversion and storage device electrically connected to the second piezoelectric ceramic plate 42 for storing the current supplied by the second piezoelectric ceramic plate 42. In some embodiments, the number of energy conversion and storage devices may be one or more.

[0043] In some embodiments, see Figure 6 As shown, the energy conversion and storage device may include: a first capacitor C P The rectifier bridge and the second capacitor C.

[0044] In some embodiments, the first capacitor C P Used to store and release charge, buffer instantaneous fluctuations in input AC power, smooth voltage through charging and discharging, and prevent spikes from damaging the rectifier bridge.

[0045] In some embodiments, the rectifier bridge can be a bridge circuit composed of four diodes (D) to convert the input alternating current (AC) into unidirectional direct current (DC), achieving unified control of the current direction. In some embodiments, the diodes (D) have unidirectional conductivity, allowing current to flow in only one direction. During the positive half-cycle of the AC current, two diodes (D) conduct to form a positive current path, allowing current to pass through the load; during the negative half-cycle, the other two diodes (D) conduct to maintain the current direction, also allowing current to pass through the load.

[0046] In some embodiments, the second capacitor C is used to store and release charge, filter out ripple in the rectified DC current, and provide a stable output voltage. In some embodiments, the second capacitor C may support pre-charging to provide electrical energy in the initial non-operational state of the piezoelectric turbine flowmeter.

[0047] See Figure 6 As shown, Figure 6 The right side of the illustrated link can be connected to a load. In some embodiments, the load can be a functional unit of a turbine flow meter. In some embodiments, the load can be an amplifier and / or a display instrument.

[0048] In some embodiments, when the energy conversion and storage device is operating... Figure 6 The left side receives AC current I, which affects the first capacitor C. P Charging, first capacitor C P voltage V P It increases exponentially with time, when the first capacitance C P voltage V P After the first set standard is reached, the first capacitor C P Current I is released to the subsequent circuit through the rectifier bridge. P The second capacitor C converts the pulsating direct current into a smooth direct current through charging and discharging. When the voltage V of the second capacitor C... CWhen the second set standard is reached, power is supplied to loads such as amplifiers and display instruments.

[0049] In one or more embodiments of this specification, see Figures 1 to 4 As shown, the piezoelectric turbine flow meter further includes a housing 5, which is fixed to the outside of the housing 1, forming an accommodating space between the housing 5 and the housing 1. In some embodiments, the housing 5 is made of a non-magnetic material. In some embodiments, the housing 5 may be rectangular.

[0050] In some embodiments, the first piezoelectric ceramic sheet 41 and / or the second piezoelectric ceramic sheet 42 are disposed within the accommodating space. In some embodiments, both the first piezoelectric ceramic sheet 41 and the second piezoelectric ceramic sheet 42 are disposed within the accommodating space. In some embodiments, see [link to relevant documentation]. Figure 4 As shown, the first piezoelectric ceramic sheet 41 and the second piezoelectric ceramic sheet 42 are disposed on both sides of the housing 1.

[0051] In some embodiments, the piezoelectric turbine flow meter further includes: a first piezoelectric ceramic plate holder for fixing a first piezoelectric ceramic plate 41 and a second piezoelectric ceramic plate holder for fixing a second piezoelectric ceramic plate 42. In some embodiments, the first piezoelectric ceramic plate holder is fixedly connected to the inner wall of the housing 5 to fix the first piezoelectric ceramic plate 41. In some embodiments, the second piezoelectric ceramic plate holder is fixedly connected to the inner wall of the housing 5 to fix the second piezoelectric ceramic plate 42.

[0052] In some embodiments, see Figure 5 As shown, both the first piezoelectric ceramic sheet support and the second piezoelectric ceramic sheet support include two oppositely arranged clamping plates 6, with the end of the first piezoelectric ceramic sheet 41 or the end of the second piezoelectric ceramic sheet 42 clamped between the two clamping plates 6.

[0053] In some embodiments, the clamping plate 6 may be L-shaped. In some embodiments, the clamping plate 6 may include a first plate-like structure 61 and a second plate-like structure 62 connected to each other. In some embodiments, the first plate-like structure 61 is perpendicular to the second plate-like structure 62. In some embodiments, the first plate-like structure 61 is used to clamp the piezoelectric ceramic sheet, and the second plate-like structure 62 provides a portion for fixing to the housing 5.

[0054] In some embodiments, one end of the first piezoelectric ceramic sheet 41 is clamped between two first plate-like structures 61 of the two clamping plates 6, and the other end of the first piezoelectric ceramic sheet 41 is clamped between two other first plate-like structures 61 of the two clamping plates 6. In some embodiments, one end of the second piezoelectric ceramic sheet 42 is clamped between two first plate-like structures 61 of the two clamping plates 6, and the other end of the second piezoelectric ceramic sheet 42 is clamped between two other first plate-like structures 61 of the two clamping plates 6.

[0055] In other embodiments, the first and second piezoelectric ceramic sheet supports can also be frame-shaped structures with an inner wall and a groove formed on the inner wall, for example, a groove formed around the circumference of the inner wall of the frame-shaped structure. In this embodiment, the first piezoelectric ceramic sheet 41 or the second piezoelectric ceramic sheet 42 can be embedded inside the groove of the frame-shaped structure.

[0056] In one or more embodiments of this specification, the turbine 2 includes: a turbine shaft 20, turbine blades 21 disposed on the turbine shaft 20, and a turbine support 22 connected to the turbine shaft 20. In some embodiments, the turbine blades 21 are configured to rotate relative to the turbine shaft 20. In some embodiments, the turbine support 22 is fixedly connected to the inner wall of the housing 1.

[0057] In some embodiments, the turbine support 22 includes: an inner ring 221 fixedly connected to the turbine shaft 20, an outer ring 222 fixedly connected to the inner wall of the housing 1, and spokes 223 connecting the inner ring 221 and the outer ring 222. In some embodiments, the shapes of the outer edges of the inner ring 221 and the outer ring 222 match the shape of the inner wall of the housing 1. In some embodiments, the spokes 223 have a rod-like structure. In some embodiments, the spokes 223 can be straight or curved. In some embodiments, there are gaps between the spokes 223 to allow the measured fluid to pass through.

[0058] In some embodiments, the turbine 2 includes a turbine support 22. In some embodiments, the turbine support 22 is located on the front side of the turbine blades 21 in the fluid flow direction. In some embodiments, the turbine support 22 is located on the rear side of the turbine blades 21 in the fluid flow direction. In some embodiments, the turbine support 22 may affect the flow velocity of the fluid being measured, slowing down the flow velocity and thus affecting the detection results. In some embodiments, the turbine support 22 located on the rear side allows the fluid being measured to pass through the turbine blades 21 first and then through the turbine support 22, avoiding the influence of the turbine support 22 on the flow velocity of the fluid being measured.

[0059] In some embodiments, the turbine 2 includes two turbine supports 22 located on the front and rear sides of the turbine blade 21 in the fluid flow direction to provide more stable support and fixation for the turbine blade 21. In some embodiments, it may further include more than two turbine supports 22.

[0060] The basic concepts have been described above. It is obvious that the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, various modifications, improvements, and corrections may be made to this specification by those skilled in the art. Such modifications, improvements, and corrections are taught in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

Claims

1. A piezoelectric turbine flowmeter characterized by, The application relates to a piezoelectric turbine flowmeter, which comprises the following parts: a shell (1), a rotatable turbine (2) arranged in the interior of the shell (1), a first magnet (31) arranged on turbine blades (21) of the turbine (2), a first piezoelectric ceramic sheet (41) fixedly arranged relative to the shell (1), and a second magnet (32) arranged on the first piezoelectric ceramic sheet (41). The first magnet (31) and the second magnet (32) are attracted to or repel each other, so that the first piezoelectric ceramic sheet (41) deforms with the rotation of the turbine (2), thereby providing a flow detection signal based on the rotation of the turbine (2). The application further comprises the following parts:

2. The piezoelectric turbine flow meter of claim 1, wherein, a processor and a display instrument, the processor being signal-connected with the first piezoelectric ceramic sheet (41) and used for processing the flow detection signal provided by the first piezoelectric ceramic sheet (41); the display instrument being signal-connected with the processor and used for displaying the rotating speed of the turbine (2) and / or the flow of fluid passing through the piezoelectric turbine flowmeter based on the processed flow detection signal. The application further comprises the following parts:

3. The piezoelectric turbine flow meter of claim 1 or 2, wherein, a second piezoelectric ceramic sheet (42) fixedly arranged relative to the shell (1) and a third magnet (33) arranged on the second piezoelectric ceramic sheet (42); the first magnet (31) and the third magnet (33) are attracted to or repel each other, so that the second piezoelectric ceramic sheet (42) deforms with the rotation of the turbine (2), thereby providing an electric current based on the rotation of the turbine (2). The application further comprises the following parts:

4. The piezoelectric turbine flow meter of claim 3, wherein, an energy conversion and storage device, which is electrically connected with the second piezoelectric ceramic sheet (42) and used for storing the electric current provided by the second piezoelectric ceramic sheet (42); the energy conversion and storage device is electrically connected with the processor and / or the display instrument. The application further comprises the following parts:

5. The piezoelectric turbine flow meter of claim 3, wherein, a cover (5) fixed to the exterior of the shell (1), and a containing space formed between the cover (5) and the shell (1); the first piezoelectric ceramic sheet (41) and / or the second piezoelectric ceramic sheet (42) are arranged in the containing space. The application further comprises the following parts:

6. The piezoelectric turbine flow meter of claim 3, wherein, a first piezoelectric ceramic sheet support for fixing the first piezoelectric ceramic sheet (41) and a second piezoelectric ceramic sheet support for fixing the second piezoelectric ceramic sheet (42); the first piezoelectric ceramic sheet support and the second piezoelectric ceramic sheet support each comprise two oppositely arranged clamping plates (6), and the end of the first piezoelectric ceramic sheet (41) or the end of the second piezoelectric ceramic sheet (42) is clamped between the two clamping plates (6). The turbine (2) comprises a turbine rotating shaft (20), the turbine blades (21) arranged on the turbine rotating shaft (20), and a turbine support (22) connected with the turbine rotating shaft (20); 7. The piezoelectric turbine flow meter of claim 1, wherein, the turbine blades (21) are configured to be rotatable relative to the turbine rotating shaft (20); the turbine support (22) is fixedly connected with the inner wall of the shell (1). ​ 8. The piezoelectric turbine flow meter of claim 7, wherein, The turbine support (22) comprises an inner ring (221) fixedly connected with the turbine rotating shaft (20), an outer ring (222) fixedly connected with the inner wall of the shell (1), and spokes (223) connecting the inner ring (221) and the outer ring (222).

9. The piezoelectric turbine flow meter of claim 7, wherein, The turbine (2) comprises one turbine support (22), and the turbine support (22) is arranged on the front side or the rear side of the turbine blade (21) in the fluid flow direction. Alternatively, the turbine (2) comprises two or more turbine supports (22), and the two turbine supports (22) are arranged on the front side and the rear side of the turbine blade (21) in the fluid flow direction.

10. The piezoelectric turbine flow meter of claim 1, wherein, The outer edge of the turbine blade (21) is provided with a groove for accommodating the first magnet (31).

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