A water flow direction detection method and device

Abstract

This invention provides a method and apparatus for detecting water flow direction. The method includes: setting up a magnetic transmission circuit (1) comprising an on-wheel magnetic circuit (1a) and a wheel-side magnetic circuit (1b), wherein the on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body, and the wheel-side magnetic circuit (1b) is composed of a magnet, magnetic sensor A, and magnetic sensor B, or a magnet, magnetic sensor A, magnetic sensor B, and a magnetically conductive sheet; changing the relative position of the on-wheel magnetic circuit (1a) and the wheel-side magnetic circuit (1b) by rotating the impeller, guiding the magnetic field circuit in the magnetic transmission circuit (1) to switch from magnetic sensor A to magnetic sensor B in a soft-switching manner; amplifying and shaping the magnetic induction signals output by magnetic sensor A and magnetic sensor B to obtain signal A and signal B, identifying the timing relationship between signal A and signal B, and inferring the water flow direction accordingly. The method features a simple structure, high reliability, low cost, and ease of installation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of water flow monitoring, and in particular to a method and apparatus for detecting water flow direction. Background Technology

[0002] In water supply pipelines, water normally flows from the supply end to the user end. However, if the water pressure decreases at the supply end, backflow / reverse flow can occur within the pipeline, meaning water will flow from the user end back to the supply end. To prevent backflow, some water supply pipelines incorporate a movable valve core structure that seals the valve opening to block reverse flow. However, existing anti-backflow devices have a problem: they may malfunction or fail to seal properly if foreign objects are present in the water flow, rendering the anti-backflow mechanism ineffective.

[0003] Identifying whether water backflow occurs in the pipeline is fundamental to determining whether the water pressure at the supply end of the water supply pipeline is normal and whether the anti-backflow mechanism is working properly.

[0004] Application number CN201920603896.0, entitled "Anti-backflow water flow sensor," discloses an anti-backflow water flow sensor. It includes a water flow rotor assembly and a magnetic element housed within a housing, and a backflow prevention valve mechanism installed in the outlet of the housing. The backflow prevention valve mechanism includes a valve port communicating with the outlet, and a valve core structure movably sealing the valve port to prevent reverse water flow, thus keeping the outlet closed and completely isolating and blocking backflow outside the valve port. Only when the water flows in the forward direction can the valve core structure be driven to move away from the valve port, opening the outlet. This technical solution ensures the normal operation of the water flow sensor while preventing backflow into the housing and its potential impact on the rotation of the water flow rotor assembly, effectively preventing backflow and improving the accuracy, stability, and safety of the water flow sensor.

[0005] The utility model application with application number CN200920000190.1 and invention title "A Sensor for Indicating Water Flow Direction" discloses a device comprising: an impeller (1) connected to a rotating shaft (5), a magnet ring (6) attached to the rotating shaft (5), and the rotating shaft (5) being located inside a bottom shell (2). The impeller (1) consists of eight impeller blades of equal length and evenly distributed. When water enters from the left end, the water flow pushes the impeller blades, causing them to rotate and drive the magnet, generating a magnetic current, indicating normal water flow. When water enters from the right end, the pressure pushes a blocking rod, which extends and jams the impeller blades, preventing them from rotating and generating a magnetic current, thus indicating backflow. This device not only accurately indicates the direction of water flow and prevents overflow and backflow, but also has a simple structure and is easy to use.

[0006] Existing technologies do not support comprehensive detection and measurement of normal water supply flow and backflow in water pipes, and lack the ability to monitor the working status of backflow valves. This invention comprehensively detects and measures the water supply flow and backflow separately.

[0007] The method and apparatus provided in this invention can overcome at least one of the shortcomings of existing technologies, such as not supporting comprehensive detection of normal water supply flow and backflow in water pipes, high power consumption, and high cost. It features a simple structure, low power consumption, and easy installation and maintenance. Summary of the Invention

[0008] The method and apparatus provided in this invention overcome at least one of the following drawbacks of existing technologies: lack of support for comprehensive detection of normal water supply flow and backflow in water pipes, high power consumption, and high cost. It features a simple structure, low power consumption, and easy installation and maintenance.

[0009] This invention provides a method for detecting water flow direction, comprising: A magnetic transmission circuit (1) is configured, comprising an on-wheel magnetic circuit (1a) and a wheel-side magnetic circuit (1b). The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body. The wheel-side magnetic circuit (1b) is composed of a magnet, magnetic sensor A, and magnetic sensor B, or a magnet, magnetic sensor A, magnetic sensor B, and a magnetically conductive sheet. The specific implementation of the magnetic transmission circuit (1) includes: In one implementation method, the on-wheel magnetic circuit (1a) is set at the outer end of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the outer end face of the impeller blade; or, In the second implementation method, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade; or, In the third implementation method, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and on the outer end of the bushing connected thereto, and correspondingly, the wheel-side magnetic circuit (1b) is set on the outer side of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; or, In the fourth implementation method, the on-wheel magnetic circuit (1a) is set at the end of the impeller bushing, and the wheel-side magnetic circuit (1b) is set on the outside of the end face of the impeller bushing. By rotating the impeller, the relative positions of the magnetic circuit (1a) on the wheel and the magnetic circuit (1b) on the wheel side are changed, and the magnetic field circuit in the magnetic transmission circuit (1) is guided to switch from magnetic sensor A to magnetic sensor B in a soft switching manner. The magnetic induction signals output by magnetic sensor A and magnetic sensor B are amplified and shaped to obtain signal A and signal B; the temporal relationship between signal A and signal B is identified and the direction of water flow is inferred from it.

[0010] This invention provides a water flow direction detection device, comprising: The system comprises a magnetic transmission circuit (1), a signal conditioning module (3), and an information processing module (5); among which, The magnetic transmission circuit (1) includes a magnetic circuit on the wheel (1a) and a magnetic circuit on the wheel side (1b), wherein, The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body; The wheel-side magnetic circuit (1b) consists of a magnet (2), a magnetic sensor A (31) and a magnetic sensor B (32), or a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32) and a magnetic conductive sheet (11); Specifically, the magnetic transmission loop (1) includes any one of the following four implementation methods: In one implementation method, the on-wheel magnetic circuit (1a) is set at the outer end of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the outer end face of the impeller blade; or, In the second implementation method, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade; or, In the third implementation method, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and on the outer end of the bushing connected thereto, and correspondingly, the wheel-side magnetic circuit (1b) is set on the outer side of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; or, In the fourth implementation method, the on-wheel magnetic circuit (1a) is set at the end of the impeller bushing, and the wheel-side magnetic circuit (1b) is set on the outside of the end face of the impeller bushing. The signal conditioning module (3) includes a signal amplification circuit and a voltage comparison circuit. Its input terminal is electrically connected to magnetic sensor A (31) and magnetic sensor B (32), and its output terminal is electrically connected to the input terminal of the information processing module (5). By rotating the impeller, the relative positions of the magnetic circuit on the wheel (1a) and the magnetic circuit on the wheel side (1b) are changed, and the magnetic field circuit in the magnetic transmission circuit (1) is guided to switch from magnetic sensor A (31) to magnetic sensor B (32) in a soft switching manner. The signal conditioning module (3) amplifies and shapes the magnetic induction signals output by magnetic sensor A31) and magnetic sensor B32) to obtain signal A and signal B; The information processing module (5) uses the timing relationship between signal A and signal B to identify the impeller rotation direction and infers the water flow direction based on the impeller rotation direction.

[0011] The method and apparatus provided in this invention can overcome at least one of the shortcomings of existing technologies, such as not supporting comprehensive detection of normal water supply flow and backflow in water pipes, high power consumption, and high cost. It features a simple structure, low power consumption, and easy installation and maintenance.

[0012] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0013] Figure 1 This is a flowchart of a water flow direction detection method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the magnetic circuit composition and signal processing circuit structure including a magnetic strip, provided in an embodiment of the present invention. Figure 3 This is an embodiment of the present invention showing the magnetic circuit composition and signal processing circuit configuration without magnetic strips; Figure 4 This is a schematic diagram of the blade tip thickening structure and wheel-side magnetic circuit provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the position of the magnetic circuit wheel side according to an embodiment of the present invention; Figure 6 This is a schematic diagram showing the location of the magnetic circuit blade root as provided in an embodiment of the present invention; Figure 7 This is a schematic diagram showing the position of the magnetic circuit on the bushing according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the waveform of the output signal of the signal conditioning module provided in an embodiment of the present invention; Figure 9 This is a circuit block diagram of the information processing module corresponding to the counter triggering method given in the embodiment of the present invention; Figure 10 This is a circuit block diagram of the information processing module corresponding to the interrupt handling method given in the embodiment of the present invention.

[0014] In the picture, 1. Magnetic transmission channel; 11. Magnetic sheet; 12. Magnetic blade; 12a. Magnetic boss; 12b. Magnetic boss; 12c. Outer end face of blade; 13. Magnetic blade; 13a. Magnetic boss; 13b. Magnetic boss; 13c. Outer end face of blade; 14. Magnetic bushing; 2. Magnet; 3. Signal conditioning module; 31. Magnetic sensor A; 32. Magnetic sensor B; 4. Impeller support sleeve; 41. Groove; 42. Impeller support shaft; 5. Information processing module; 51. Data processor; 52. Forward counter; 53. Reverse counter; 54. Flow calibration data storage. Example

[0015] The method and apparatus provided in this invention overcome at least one of the following drawbacks of existing technologies: lack of support for comprehensive detection of normal water supply flow and backflow in water pipes, high power consumption, and high cost. It features a simple structure, low power consumption, and easy installation and maintenance.

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0017] The methods and apparatus provided by the present invention will be described below with reference to the accompanying drawings.

[0018] Example 1: A method for detecting water flow direction An embodiment of a water flow direction detection method provided by this invention is shown below. Figure 1 As shown, it includes: Step S110, Magnetic transmission channel construction: A magnetic transmission loop (1) is set up, comprising an on-wheel magnetic circuit (1a) and a wheel-side magnetic circuit (1b). The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body. The wheel-side magnetic circuit (1b) is composed of a magnet, magnetic sensor A, and magnetic sensor B, or a magnet, magnetic sensor A, magnetic sensor B, and a magnetically conductive sheet. The specific implementation of the magnetic transmission loop (1) includes: In one implementation method, the on-wheel magnetic circuit (1a) is set at the outer end of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the outer end face of the impeller blade; or, In the second implementation method, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade; or, In the third implementation method, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and on the outer end of the bushing connected thereto, and correspondingly, the wheel-side magnetic circuit (1b) is set on the outer side of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; or, In the fourth implementation method, the on-wheel magnetic circuit (1a) is set at the end of the impeller bushing, and the wheel-side magnetic circuit (1b) is set on the outer side of the impeller bushing end face; Step S120, magnetic field path switching: by rotating the impeller, the relative position of the magnetic circuit on the wheel (1a) and the magnetic circuit on the wheel side (1b) is changed, and the magnetic field circuit in the magnetic transmission circuit (1) is guided to switch from magnetic sensor A to magnetic sensor B in a soft switching manner; Step S130, water flow direction identification: amplify and shape the magnetic induction signals output by magnetic sensor A and magnetic sensor B to obtain signal A and signal B; identify the timing relationship between signal A and signal B and infer the water flow direction accordingly.

[0019] Specifically, implementation method one to implementation method four correspond to four different installation positions of the on-wheel magnetic circuit (1a) on the impeller and the corresponding installation positions of the wheel-side magnetic circuit (1b) on the outside of the impeller.

[0020] Corresponding to the first implementation method of the magnetic transmission circuit (1), there are two methods: implementation method 1A and implementation method 1B. Implementation method A, see Figure 2 As shown, the on-wheel magnetic circuit (1a) is composed of an impeller body component made of magnetically conductive material. Specifically, the on-wheel magnetic circuit (1a) includes: a first magnetically conductive blade (12), a second magnetically conductive blade (13), and a magnetically conductive bushing (14). The first magnetically conductive blade (12) and the second magnetically conductive blade (13) are fabricated on the magnetically conductive bushing (14) or are supported by the magnetically conductive bushing (14). Alternatively, the on-wheel magnetic circuit (1a) is composed of magnetically conductive material mounted on the impeller body. Accordingly, the wheel-side magnetic circuit (1b) is composed of a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32), and a magnetic sheet (11).

[0021] Figure 2 As the magnetic circuit (1a) on the wheel rotates, the magnetic field on the wheel changes between the first position (21) and the second position (22).

[0022] Implementation method 1B, see Figure 3 As shown, The on-wheel magnetic circuit (1a) is composed of an impeller body component made of magnetically conductive material. Specifically, the on-wheel magnetic circuit (1a) includes: a first magnetically conductive blade (12), a second magnetically conductive blade (13), and a magnetically conductive bushing (14). The first magnetically conductive blade (12) and the second magnetically conductive blade (13) are fabricated on the magnetically conductive bushing (14) or are supported by the magnetically conductive bushing (14). Alternatively, the on-wheel magnetic circuit (1a) is composed of magnetically conductive material mounted on the impeller body. Accordingly, the wheel-side magnetic circuit (1b) consists of a magnet (2), a magnetic sensor A (31), and a magnetic sensor B (32).

[0023] Figure 3 As the magnetic circuit (1a) on the wheel rotates, the magnetic field on the wheel changes between the first position (21) and the second position (22).

[0024] The signal conditioning module (3) obtains magnetic induction signals from magnetic sensor A (31) and magnetic sensor B (32), amplifies and shapes the magnetic induction signal output by magnetic sensor A (31) to obtain signal A; amplifies and shapes the magnetic induction signal output by magnetic sensor B (32) to obtain signal B; the signal conditioning module (3) outputs signal A and signal B to the information processing module (5), the information processing module (5) processes signal A and signal B, identifies the temporal relationship between signal A and signal B and infers the direction of water flow based on this.

[0025] The time relationship between signal A and signal B output by signal conditioning module (3) is shown in the figure. Figure 8 (a) and Figure 8 As shown in (b): Figure 8 In (a), signal A appears before signal B, indicating that the impeller rotates from magnetic sensor A (31) to magnetic sensor B (32). See ,2 and Figure 3 As shown, the impeller rotates clockwise. In this invention, the clockwise rotation of the impeller is referred to as forward rotation. Figure 8 In (b), signal B appears before signal A, indicating that the impeller rotates from magnetic sensor B (32) to magnetic sensor A (31). See ,2 and Figure 3 As shown, the impeller rotates counterclockwise, which is referred to as reverse rotation.

[0026] Figure 8 The given diagram shows the timing relationship between signal A and signal B. Figure 8 The timing relationship between signal A and signal B satisfies the soft handover timing relationship.

[0027] Figure 8 In the middle, T A T is the interrupt trigger time of signal A. B It is the interrupt trigger time of signal B.

[0028] The triggering time for multiple interrupts of signals A and B is expressed as: T A1 T is the time when signal A is first interrupted. B1 T is the time when signal B is first interrupted. A2 T is the second interrupt trigger time for signal A. B2 This is the second interrupt trigger time for signal B. The rising edges of signals A and B generate the interrupt trigger signals.

[0029] Time t is the time between two interrupt triggers within the group. A With T B The interval time is T, where T is the interval between groups.

[0030] For the second implementation method corresponding to the magnetic transmission loop (1), see [link to relevant documentation]. Figure 5 As shown, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade accordingly; In the second implementation method, the on-wheel magnetic circuit (1a) is composed of a single magnetic blade made of magnetic material, such as a single first magnetic blade (12) or a single second magnetic blade (13), or a magnetic material installed on a single blade; the wheel-side magnetic circuit (1b) is located on the outer side of the radial side of the impeller blade, and the magnetic field direction in the magnet body contained in the wheel-side magnetic circuit (1b) or the magnetic field direction in the magnetic sheet contained therein is consistent with the radial direction of the impeller blade; the wheel-side magnetic circuit (1b) and the on-wheel magnetic circuit (1a) form a magnetic loop at two points with different radii in the radial direction of the impeller blade.

[0031] The signal processing method under the second implementation of the magnetic transmission circuit (1) is the same as that under the first implementation.

[0032] For the third implementation method corresponding to the magnetic transmission loop (1), see [link to relevant documentation]. Figure 6 As shown, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and the outer end of the bushing connected thereto, and the wheel-side magnetic circuit (1b) is set on the outside of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; In the third implementation of the magnetic transmission circuit (1), the on-wheel magnetic circuit (1a) includes: the bottom of the first magnetic guide blade (12), the bottom of the second magnetic guide blade (13), and a magnetic guide sleeve (14) that provides structural support connection for the bottom of the first magnetic guide blade (12) and the bottom of the second magnetic guide blade (13); or, the on-wheel magnetic circuit (1a) is made of magnetic material installed on the impeller body; Accordingly, the wheel-side magnetic circuit (1b) is composed of a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32) and a magnetic conductive sheet (11); or it is composed of a magnet (2), a magnetic sensor A (31) and a magnetic sensor B (32).

[0033] The direction of the magnetic field in the on-wheel magnetic circuit (1a) is consistent with the direction of impeller rotation, and the direction of the magnetic field in the wheel-side magnetic circuit (1b) is consistent with the direction of impeller rotation. The signal processing method under the second implementation of the magnetic transmission circuit (1) is the same as that under the first implementation.

[0034] For the fourth implementation method corresponding to the magnetic transmission loop (1), see [link to implementation method]. Figure 7 As shown, the magnetic circuit on the wheel (1a) is set at the end of the impeller bushing, and the magnetic circuit on the wheel side (1b) is set on the outer side of the end face of the impeller bushing; The on-wheel magnetic circuit (1a) includes: a magnetically conductive bushing (14); or, the on-wheel magnetic circuit (1a) is made of a magnetically conductive material mounted on the impeller bushing; Accordingly, the wheel-side magnetic circuit (1b) is composed of a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32) and a magnetic conductive sheet (11); or it is composed of a magnet (2), a magnetic sensor A (31) and a magnetic sensor B (32).

[0035] The direction of the magnetic field in the on-wheel magnetic circuit (1a) is consistent with the direction of impeller rotation, and the direction of the magnetic field in the wheel-side magnetic circuit (1b) is consistent with the direction of impeller rotation. The signal processing method under the second implementation of the magnetic transmission circuit (1) is the same as that under the first implementation.

[0036] The magnetic sensor A and magnetic sensor B described in this embodiment of the invention specifically include any one of the following: a Hall sensor, an AMR (Anisotropic Magnetic Resistance) magnetic sensor, a TMR (Tunnel Magnetic Resistance) magnetic sensor, and a conductive coil.

[0037] The method provided in this embodiment, wherein, The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body. Specifically, Corresponding to the first implementation method, the on-wheel magnetic circuit (1a) includes two blades and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet fixed on two adjacent blades to form a magnetic passage. Corresponding to the second implementation method, the on-wheel magnetic circuit (1a) includes a blade made of magnetic material, or a magnetic sheet fixed to the side of the blade to form a magnetic path. Corresponding to implementation method three, the on-wheel magnetic circuit (1a) includes two blade bottoms and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet with both ends fixed to the bottoms of two adjacent blades and both end faces facing the axial direction of the impeller. Corresponding to implementation method four, the on-wheel magnetic circuit (1a) includes a bushing made of magnetically conductive material, or includes a magnetically conductive sheet fixed on the bushing to form a magnetic passage. The wheel-side magnetic circuit (1b) consists of a magnet, magnetic sensor A, and magnetic sensor B, or a magnet, magnetic sensor A, magnetic sensor B, and a magnetic conductive sheet. Specifically, Corresponding to the first implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the outer end of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the outer end of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the outer end of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is consistent with the radial direction of the blade. Corresponding to the second implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the radial side of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the radial direction of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the rotation direction of the blade. Corresponding to implementation method three, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located on the outer side of the radial side of the blade root, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the direction of blade rotation, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the direction of blade rotation. Corresponding to implementation mode four, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located outside the impeller shaft seat, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the impeller shaft sleeve. The magnetic field direction in the middle of the magnet or the middle of the magnetic conductive sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the impeller shaft sleeve, and the magnetic field direction at both ends of the magnet or the two ends of the magnetic conductive sheet is perpendicular to the rotation direction of the impeller shaft sleeve.

[0038] Specifically, the method for constructing the magnetic transmission channel carried by the first magnetic guide blade and the second magnetic guide blade includes: The first and second magnetically conductive blades are magnetically connected via a magnetically conductive impeller bushing that provides structural support; or The first magnetic guide blade and the second magnetic guide blade are magnetically connected through a separate magnetic circuit connector outside the impeller bushing.

[0039] The method for constructing the magnetic transmission channel carried by the first magnetic blade and the second magnetic blade includes: including an outer end thickening portion on one or both sides of the outer end of the first magnetic blade and the second magnetic blade of the impeller, wherein the outer end thickening portion increases the thickness of the outer end face of the blade and increases the magnetic field coverage range near the outer end face.

[0040] The thickness of the thickened portion at the outer end is greater than the average thickness of the magnetic blade, and the thickness of the outer end face of the blade is greater than the average thickness of the magnetic blade.

[0041] The method provided in this embodiment, wherein, The magnetic field circuit within the guiding magnetic transmission channel is switched from magnetic sensor A to magnetic sensor B via a soft switching mechanism, specifically including: During the first time interval, the magnetic field loop only covers sensor A (31) or sensor B (32), that is, the magnetic field loop only has an output signal strength that exceeds the detection threshold at sensor A or sensor B. During the second time interval, the magnetic field loop simultaneously covers both sensor A and sensor B, meaning that the magnetic field loop has the output signal strength at both sensor A and sensor B that exceeds the detection threshold. During the third time interval, the magnetic field loop only covers sensor B or sensor A, meaning that the magnetic field loop only has an output signal strength that exceeds the detection threshold at sensor A or sensor B.

[0042] The method provided in this embodiment, wherein, During the second time interval, the magnetic field circuit simultaneously covers both magnetic sensor A (31) and magnetic sensor B (32), meaning that the magnetic field circuit has an output signal strength exceeding the detection threshold at both magnetic sensor A and magnetic sensor B. Specifically, this includes the following steps: When magnetic sensor A and magnetic sensor B are placed side by side in the magnetic field circuit, the distance between their center points is less than the thickness of the end face of the magnetic circuit (1a) on the wheel that they face; or, An end face thickening portion is provided on the wheel portion corresponding to the magnetic circuit port portion in the wheel-side magnetic circuit (1b). The thickness of the end face thickening portion is greater than the distance between the center points of the magnetic sensor A (32) and the magnetic sensor B (32) when they are placed side by side in the magnetic field circuit. The end face thickening portion includes any one of the following: impeller outer end thickening portion, impeller radial side thickening portion, impeller radial side root thickening portion, and impeller shaft sleeve end face thickening portion. The thickening portion can be implemented on the impeller body or on the magnetic conductor provided on the impeller body.

[0043] The thickened portion at the outer end of the impeller, the thickened portion on the radial side of the impeller, the thickened portion at the root of the radial side of the impeller, and the thickened portion at the end face of the impeller bushing are used to ensure that the thickness of the corresponding part of the impeller can simultaneously cover the magnetic induction unit contained in magnetic sensor A and magnetic sensor B.

[0044] As a specific implementation of the thickened section, the thickened section at the outer end of the impeller is used as an example for explanation. (See [link to relevant documentation]). Figure 4 As shown.

[0045] The first magnetic blade (12) is a component of the magnetic circuit (1a) on the wheel. At least one side of its outer end has a magnetic boss (12a) or a magnetic boss (12b). The magnetic boss (12a) or the magnetic boss (12b) has the same outer end face (12c) as the first magnetic blade (12). The second magnetic blade (13) is a component of the magnetic circuit on the wheel (1a), and at least one side of its outer end has a magnetic boss (13a) or a magnetic boss (13b). The magnetic boss (13a) or the magnetic boss (13b) has the same outer end face (13c) as the second magnetic blade (13).

[0046] The method provided in this embodiment, wherein, The method of identifying the time relationship between signal A and signal B and inferring the direction of water flow specifically includes one of the following methods: Counter triggering method: Connect signal A to the enable terminal of the forward counter, and connect signal B to the counting terminal of the forward counter. The rising edge of signal B during the high-level duration of signal A triggers the forward counter to perform addition counting; and / or Connect signal B to the enable terminal of the inverting counter and signal A to the counting terminal of the inverting counter. The rising edge of signal A during the high-level duration of signal B triggers the inverting counter to perform an increment count. If the count value of the forward counter increases, the water flow direction is identified as forward; if the count value of the inverting counter increases, the water flow direction is identified as reverse. Interrupt handling method: Connect signals A and B to two different interrupt inputs of the digital processor, or connect the output of a logical OR operation between signals A and B to the interrupt input of the digital processor; use the internal counters of the digital processor as on-chip forward and reverse counters, or use external counters of the digital processor as off-chip forward and reverse counters; the digital processor responds to the interrupt request generated by signals A and / or B, and determines the water flow direction based on the relative time relationship between the high levels of signals A and B.

[0047] The counter-triggered method specifically includes: Signals A and B output by the signal conditioning module (3) are used to trigger the forward counter (52) or the reverse counter (53) in the information processing module (5). See [link to relevant documentation]. Figure 9 As shown.

[0048] A method for identifying the direction of impeller rotation, comprising: If the count value of the forward counter (52) changes, it is identified as the impeller rotating forward (clockwise). If the count value of the reverse counter (53) changes, it is identified as impeller reverse transmission (rotation in the counterclockwise direction).

[0049] The interrupt handling method specifically includes: The method of connecting signal A and signal B to two different interrupt input terminals of the digital processor includes the following connection methods: In connection method one, signals A and B are connected to two different interrupt input terminals INT0 and INT1 of the digital processor, respectively. Interrupt input terminals INT0 and INT1 are used both to trigger interrupts for signals A and B, and to read the levels of signals A and B. (See [link to relevant documentation]). Figure 10 As shown; or In the second connection method, signals A and B are connected to two different interrupt input terminals INT0 and INT1 of the digital processor, respectively, and signals A and B are also connected to two different data input terminals D0 and D1 of the digital processor. The digital processor responds to the interrupts generated by signals A and B from INT0 and INT1, and reads the levels of signals A and B from data input terminals D0 and D1. The connection of the output terminal of the logical OR operation between signal A and signal B to the interrupt input terminal of the digital processor includes the following connection methods: In connection method three, signal A and signal B are respectively connected to the two input terminals of the logic "OR" circuit, the output terminal of the logic "OR" circuit is connected to the interrupt input terminal INT0 of the digital processor, and signal A and signal B connected to the two input terminals of the logic "OR" circuit are respectively connected to the two different data input terminals D0 and D1 of the digital processor. After responding to the interrupt request of the interrupt input terminal INT0, the digital processor reads the level of signal A and signal B from the data input terminals D0 and D1.

[0050] When using internal counters of the digital processor as on-chip forward and inverse counters, or using external counters of the digital processor as off-chip forward and inverse counters, the triggering methods for the counters include: Trigger the forward / reverse counter to count during each interruption caused by response signal A or signal B; or, The forward / reverse counter is triggered every N interrupts caused by response signal A or signal B, where N is a natural number greater than 1.

[0051] Furthermore, when the impeller rotates forward, the water flow direction is determined to be the normal water supply direction; when the impeller rotates in reverse, the water flow direction is determined to be the return flow direction, which is opposite to the normal water supply direction.

[0052] Furthermore, the water flow direction is determined based on the relationship between the impeller rotation direction and the water flow direction. The number of impeller rotations per unit time is recorded using an on-chip counter or an off-chip counter of the digital processor.

[0053] The method provided in this embodiment, wherein, The interrupt handling method, which connects signal A and signal B to two different interrupt inputs of the digital processor, further includes: Interrupt handling method one: After responding to the interrupt request generated by signal A or signal B, mark the corresponding interrupt source as signal A or signal B according to the correspondence between signal A and signal B and the interrupt input terminal; Mark the interrupt trigger time, and mark the interrupt request trigger time value of signal A as T. A Mark the interrupt request trigger time value of signal B as T. B ; Using three or more arrivals sequentially in time, T A and T B The time series data, which together form the data, identifies the intra-group interruption interval t and the inter-group interruption interval T. Based on T with an intra-group interruption interval t A With T B The order in which they appear determines the direction of impeller rotation and water flow; or, Based on a pair of T with an intra-group interruption interval t A With T B One of them and another pair of T with an intra-group interruption interval t A With T B The order in which one of them occurs at present determines the direction of impeller rotation and water flow; The operation of connecting the output of the logical OR operation between signal A and signal B to the interrupt input of the digital processor, as described in the interrupt handling method, further includes: Interrupt handling method two involves reading the levels and corresponding interrupt trigger times of signals A and B during the interrupt response process to obtain the interrupt trigger time sequence (T) generated by signals A and B. A / B1 T A / B 2 T A / B 3 T A / B 4 ...); using three or more interrupt trigger times in the interrupt trigger time sequence, identify two interrupt triggers with a small time interval (T). A / B n ,T A / (B n+1) This constitutes a trigger within the group, where n is a natural number; If T A / B n If the level combination of the corresponding signal A and signal B is (1,0), then the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be in the forward direction. If T A / B n If the level combination of the corresponding signals A and B is (0,1), then the impeller is judged to be rotating in reverse, and the water flow direction is judged to be reversed.

[0054] Furthermore, the interrupt handling method described above uses three or more time-sequentially arriving nodes by T. A and T BThe time series formed by these two methods is as follows: Record the interrupt trigger times of signals A and B, and denote the first interrupt trigger time generated by signals A and B as T. A1 T B1 The time of the second interrupt triggered by signals A and B is denoted as T. A2 T B2 The time of the third interrupt triggered by signals A and B is denoted as T. A3 T B3 .

[0055] Interrupt handling method one, based on T with an intra-group interrupt interval t A With T B The order in which they appear determines the direction of impeller rotation and water flow. The specific method is as follows: If T A1 <T B1 If so, the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be in the forward direction; If T B1 <T A1 If the impeller is reversed, the water flow direction is determined to be reversed.

[0056] The interrupt handling method described in section one is based on a pair of T values ​​with an intra-group interrupt interval t. A With T B One of them and another pair of T with an intra-group interruption interval t A With T B The direction of impeller rotation and water flow is determined by the order of events between two points in time. The specific method is as follows: If T A1 <T B1 <T A2 <T B2 ;or T B1 <T A2 <T B2 ;or T B1 <T A2 ; Then the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be positive. If T B1 <T A1 <T> B2 <T A2 ;or <T A1 <T> B2 <T A2 ;or <T A1 <T> B2 ; If the impeller is reversed, the water flow direction is determined to be reversed.

[0057] The interrupt handling method described in section two (T) A / B1 T A / B 2 T A / B 3 T A / B 4 T in ) A / B1 T A / B 2 T A / B 3 T A / B 4 This indicates the time when signal A or signal B triggers the 1st, 2nd, 3rd, and 4th interrupt.

[0058] Specifically, in T A / B n When the level combination of signal A and signal B is (1,0), it is the interrupt trigger signal generated by signal A, AA. Signal A is interrupted before signal B, and the impeller is in the forward rotation state. Specifically, in T A / B n When the level combination of signal A and signal B is (1,0), it is the interrupt trigger signal generated by signal B. Signal B is interrupted before signal A, and the impeller is in reverse rotation.

[0059] The method provided in this embodiment also includes a water flow metering method, specifically including: Read the increase in flow data of the reference flow meter and the increase in the number of trigger pulses recorded by the corresponding forward counter within the same reference time interval. Construct a forward water flow lookup table in a one-to-one correspondence between the increase in flow data and the increase in the number of trigger pulses, and store the forward water flow lookup table in the flow calibration data storage (54). The reference flow meter is inserted in series in the normal water supply direction of the pipeline where the impeller is located. and / or Read the flow increase data of the reference flow meter within the same reference time interval and the corresponding increase in the number of trigger pulses recorded by the reverse counter. Construct a reverse water flow lookup table in a one-to-one correspondence between the flow data increase and the number of trigger pulse increases, and store the reverse water flow lookup table in the flow calibration data storage (54). The reference flow meter is inserted in series in the opposite direction to the normal water supply of the pipeline where the impeller is located.

[0060] Figure 9 and Figure 10 The connection relationship between the flow calibration data storage (54) and the data processor (51) is given respectively.

[0061] Figure 2 and Figure 3The impeller support shaft (42) given is a hollow or solid circular cylindrical support body used to provide rotational support for the magnetic shaft sleeve (14); the water pipe wall (4) has a groove (41) for installing the wheel-side magnetic circuit module (1b).

[0062] Example 2: A water flow direction detection device An embodiment of a water flow direction detection device provided by the present invention is shown below. Figure 2 and Figure 3 As shown, it includes: The system comprises a magnetic transmission circuit (1), a signal conditioning module (3), and an information processing module (5); among which, The magnetic transmission circuit (1) includes a magnetic circuit on the wheel (1a) and a magnetic circuit on the wheel side (1b), wherein, The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body; The wheel-side magnetic circuit (1b) consists of a magnet (2), a magnetic sensor A (31) and a magnetic sensor B (32), or a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32) and a magnetic conductive sheet (11); Specifically, the magnetic transmission loop (1) includes any one of the following four implementation methods: In one implementation method, the on-wheel magnetic circuit (1a) is set at the outer end of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the outer end face of the impeller blade; or, In the second implementation method, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade; or, In the third implementation method, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and on the outer end of the bushing connected thereto, and correspondingly, the wheel-side magnetic circuit (1b) is set on the outer side of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; or, In the fourth implementation method, the on-wheel magnetic circuit (1a) is set at the end of the impeller bushing, and the wheel-side magnetic circuit (1b) is set on the outside of the end face of the impeller bushing. The signal conditioning module (3) includes a signal amplification circuit and a voltage comparison circuit. Its input terminal is electrically connected to magnetic sensor A (31) and magnetic sensor B (32), and its output terminal is electrically connected to the input terminal of the information processing module (5). By rotating the impeller, the relative positions of the magnetic circuit on the wheel (1a) and the magnetic circuit on the wheel side (1b) are changed, and the magnetic field circuit in the magnetic transmission circuit (1) is guided to switch from magnetic sensor A (31) to magnetic sensor B (32) in a soft switching manner. The signal conditioning module (3) amplifies and shapes the magnetic induction signals output by magnetic sensor A31) and magnetic sensor B32) to obtain signal A and signal B; The information processing module (5) uses the timing relationship between signal A and signal B to identify the impeller rotation direction and infers the water flow direction based on the impeller rotation direction.

[0063] Specifically, implementation method one to implementation method four correspond to four different installation positions of the on-wheel magnetic circuit (1a) on the impeller and the corresponding installation positions of the wheel-side magnetic circuit (1b) on the outside of the impeller.

[0064] Corresponding to the first implementation method of the magnetic transmission circuit (1), there are two methods: implementation method 1A and implementation method 1B. Implementation method A, see Figure 2 As shown, the on-wheel magnetic circuit (1a) is composed of an impeller body component made of magnetically conductive material. Specifically, the on-wheel magnetic circuit (1a) includes: a first magnetically conductive blade (12), a second magnetically conductive blade (13), and a magnetically conductive bushing (14). The first magnetically conductive blade (12) and the second magnetically conductive blade (13) are fabricated on the magnetically conductive bushing (14) or are supported by the magnetically conductive bushing (14). Alternatively, the on-wheel magnetic circuit (1a) is composed of magnetically conductive material mounted on the impeller body. Accordingly, the wheel-side magnetic circuit (1b) is composed of a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32), and a magnetic sheet (11).

[0065] Figure 2 As the magnetic circuit (1a) on the wheel rotates, the magnetic field on the wheel changes between the first position (21) and the second position (22).

[0066] Implementation method 1B, see Figure 3 As shown, The on-wheel magnetic circuit (1a) is composed of an impeller body component made of magnetically conductive material. Specifically, the on-wheel magnetic circuit (1a) includes: a first magnetically conductive blade (12), a second magnetically conductive blade (13), and a magnetically conductive bushing (14). The first magnetically conductive blade (12) and the second magnetically conductive blade (13) are fabricated on the magnetically conductive bushing (14) or are supported by the magnetically conductive bushing (14). Alternatively, the on-wheel magnetic circuit (1a) is composed of magnetically conductive material mounted on the impeller body. Accordingly, the wheel-side magnetic circuit (1b) consists of a magnet (2), a magnetic sensor A (31), and a magnetic sensor B (32).

[0067] Figure 3 As the magnetic circuit (1a) on the wheel rotates, the magnetic field on the wheel changes between the first position (21) and the second position (22).

[0068] The signal conditioning module (3) obtains magnetic induction signals from magnetic sensor A (31) and magnetic sensor B (32), amplifies and shapes the magnetic induction signal output by magnetic sensor A (31) to obtain signal A; amplifies and shapes the magnetic induction signal output by magnetic sensor B (32) to obtain signal B; the signal conditioning module (3) outputs signal A and signal B to the information processing module (5), the information processing module (5) processes signal A and signal B, identifies the temporal relationship between signal A and signal B and infers the direction of water flow based on this.

[0069] The time relationship between signal A and signal B output by signal conditioning module (3) is shown in the figure. Figure 8 (a) and Figure 8 As shown in (b): Figure 8 In (a), signal A appears before signal B, indicating that the impeller rotates from magnetic sensor A (31) to magnetic sensor B (32). See ,2 and Figure 3 As shown, the impeller rotates clockwise. In this invention, the clockwise rotation of the impeller is referred to as forward rotation. Figure 8 In (b), signal B appears before signal A, indicating that the impeller rotates from magnetic sensor B (32) to magnetic sensor A (31). See ,2 and Figure 3 As shown, the impeller rotates counterclockwise, which is referred to as reverse rotation.

[0070] Figure 8 The given diagram shows the timing relationship between signal A and signal B. Figure 8 The timing relationship between signal A and signal B satisfies the soft handover timing relationship.

[0071] Figure 8 In the middle, T A T is the interrupt trigger time of signal A. B It is the interrupt trigger time of signal B.

[0072] The triggering time for multiple interrupts of signals A and B is expressed as: T A1 T is the time when signal A is first interrupted. B1 T is the time when signal B is first interrupted. A2 T is the second interrupt trigger time for signal A. B2 This is the second interrupt trigger time for signal B. The rising edges of signals A and B generate the interrupt trigger signals.

[0073] Time t is the time between two interrupt triggers within the group. A With T B The interval time is T, where T is the interval between groups.

[0074] For the second implementation method corresponding to the magnetic transmission loop (1), see [link to relevant documentation]. Figure 5 As shown, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade accordingly; In the second implementation method, the on-wheel magnetic circuit (1a) is composed of a single magnetic blade made of magnetic material, such as a single first magnetic blade (12) or a single second magnetic blade (13), or a magnetic material installed on a single blade; the wheel-side magnetic circuit (1b) is located on the outer side of the radial side of the impeller blade, and the magnetic field direction in the magnet body contained in the wheel-side magnetic circuit (1b) or the magnetic field direction in the magnetic sheet contained therein is consistent with the radial direction of the impeller blade; the wheel-side magnetic circuit (1b) and the on-wheel magnetic circuit (1a) form a magnetic loop at two points with different radii in the radial direction of the impeller blade.

[0075] The signal processing method under the second implementation of the magnetic transmission circuit (1) is the same as that under the first implementation.

[0076] For the third implementation method corresponding to the magnetic transmission loop (1), see [link to relevant documentation]. Figure 6 As shown, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and the outer end of the bushing connected thereto, and the wheel-side magnetic circuit (1b) is set on the outside of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; In the third implementation of the magnetic transmission circuit (1), the on-wheel magnetic circuit (1a) includes: the bottom of the first magnetic guide blade (12), the bottom of the second magnetic guide blade (13), and a magnetic guide sleeve (14) that provides structural support connection for the bottom of the first magnetic guide blade (12) and the bottom of the second magnetic guide blade (13); or, the on-wheel magnetic circuit (1a) is made of magnetic material installed on the impeller body; Accordingly, the wheel-side magnetic circuit (1b) is composed of a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32) and a magnetic conductive sheet (11); or it is composed of a magnet (2), a magnetic sensor A (31) and a magnetic sensor B (32).

[0077] The direction of the magnetic field in the on-wheel magnetic circuit (1a) is consistent with the direction of impeller rotation, and the direction of the magnetic field in the wheel-side magnetic circuit (1b) is consistent with the direction of impeller rotation. The signal processing method under the second implementation of the magnetic transmission circuit (1) is the same as that under the first implementation.

[0078] For the fourth implementation method corresponding to the magnetic transmission loop (1), see [link to implementation method]. Figure 7 As shown, the magnetic circuit on the wheel (1a) is set at the end of the impeller bushing, and the magnetic circuit on the wheel side (1b) is set on the outer side of the end face of the impeller bushing; The on-wheel magnetic circuit (1a) includes: a magnetically conductive bushing (14); or, the on-wheel magnetic circuit (1a) is made of a magnetically conductive material mounted on the impeller bushing; Accordingly, the wheel-side magnetic circuit (1b) is composed of a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32) and a magnetic conductive sheet (11); or it is composed of a magnet (2), a magnetic sensor A (31) and a magnetic sensor B (32).

[0079] The direction of the magnetic field in the on-wheel magnetic circuit (1a) is consistent with the direction of impeller rotation, and the direction of the magnetic field in the wheel-side magnetic circuit (1b) is consistent with the direction of impeller rotation. The signal processing method under the second implementation of the magnetic transmission circuit (1) is the same as that under the first implementation.

[0080] The magnetic sensor A and magnetic sensor B described in this embodiment of the invention specifically include any one of the following: a Hall sensor, an AMR (Anisotropic Magnetic Resistance) magnetic sensor, a TMR (Tunnel Magnetic Resistance) magnetic sensor, and a conductive coil.

[0081] The on-wheel magnetic circuit (1a) includes an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body. Specifically, Corresponding to the first implementation method, the on-wheel magnetic circuit (1a) includes two blades and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet fixed on two adjacent blades to form a magnetic passage. Corresponding to the second implementation method, the on-wheel magnetic circuit (1a) includes a blade made of magnetic material, or a magnetic sheet fixed to the side of the blade to form a magnetic path. Corresponding to implementation method three, the on-wheel magnetic circuit (1a) includes two blade bottoms and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet with both ends fixed to the bottoms of two adjacent blades and both end faces facing the axial direction of the impeller. Corresponding to implementation method four, the on-wheel magnetic circuit (1a) includes a bushing made of magnetically conductive material, or includes a magnetically conductive sheet fixed on the bushing to form a magnetic passage.

[0082] The wheel-side magnetic circuit (1b) includes a magnet, magnetic sensor A, and magnetic sensor B, or includes a magnet, magnetic sensor A, magnetic sensor B, and a magnetic conductive sheet. Specifically, Corresponding to the first implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the outer end of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the outer end of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the outer end of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is consistent with the radial direction of the blade. Corresponding to the second implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the radial side of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the radial direction of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the rotation direction of the blade. Corresponding to implementation method three, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located on the outer side of the radial side of the blade root, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the direction of blade rotation, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the direction of blade rotation. Corresponding to implementation mode four, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located outside the impeller shaft seat, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the impeller shaft sleeve. The magnetic field direction in the middle of the magnet or the middle of the magnetic conductive sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the impeller bushing, and the magnetic field direction at both ends of the magnet or the two ends of the magnetic conductive sheet is perpendicular to the rotation direction of the impeller bushing. Specifically, the method for constructing the magnetic transmission channel carried by the first magnetic guide blade and the second magnetic guide blade includes: The first and second magnetically conductive blades are magnetically connected via a magnetically conductive impeller bushing that provides structural support; or The first magnetic guide blade and the second magnetic guide blade are magnetically connected through a separate magnetic circuit connector outside the impeller bushing.

[0083] The method for constructing the magnetic transmission channel carried by the first magnetic blade and the second magnetic blade includes: including an outer end thickening portion on one or both sides of the outer end of the first magnetic blade and the second magnetic blade of the impeller, wherein the outer end thickening portion increases the thickness of the outer end face of the blade and increases the magnetic field coverage range near the outer end face.

[0084] The thickness of the thickened portion at the outer end is greater than the average thickness of the magnetic blade, and the thickness of the outer end face of the blade is greater than the average thickness of the magnetic blade.

[0085] The on-wheel magnetic circuit (1a) and the wheel-side magnetic circuit (1b) have the following relative positional relationship: Within the first time interval, there is a first relative positional relationship between the on-wheel magnetic circuit (1a) and the wheel-side magnetic circuit (1b). Under the first relative positional relationship, the magnetic circuit end face of the on-wheel magnetic circuit (1a) only covers sensor A (31) or sensor B (32). That is, the magnetic circuit end face of the on-wheel magnetic circuit (1a) only has an output signal strength that exceeds the detection threshold at sensor A (31) or sensor B (32). During the second time interval, the magnetic circuit on the wheel (1a) and the magnetic circuit on the side of the wheel (1b) have a second relative position relationship. The magnetic circuit end face included in the magnetic circuit on the wheel (1a) simultaneously covers sensor A (31) and sensor B (32). That is, the magnetic field loop has an output signal strength that exceeds the detection threshold at both sensor A (31) and sensor B (32). During the third time interval, the magnetic circuit on the wheel (1a) and the magnetic circuit on the side of the wheel (1b) have a third relative positional relationship. The magnetic circuit end face contained in the magnetic circuit on the wheel (1a) only covers sensor B (32) or sensor A (31). That is, the magnetic field loop only has an output signal strength that exceeds the detection threshold at sensor A (31) or sensor B (32).

[0086] The on-wheel magnetic circuit (1a) and the wheel-side magnetic circuit (1b) have the following coverage relationship: The magnetic circuit end face of the on-wheel magnetic circuit (1a) covers the sensor A (31) and sensor B (32) included in the wheel-side magnetic circuit (1b), specifically: When magnetic sensors A (32) and B (32) are placed side by side in a magnetic field loop, the distance between their center points is less than the thickness of the end face of the magnetic circuit contained in the magnetic circuit (1a) on the wheel they face; or, An end face thickening portion is provided at the magnetic circuit port of the on-wheel magnetic circuit (1a) corresponding to the location of sensor A (31) and sensor B (32) included in the wheel-side magnetic circuit (1b). The thickness of the end face thickening portion is greater than the distance between the center points of magnetic sensor A (32) and magnetic sensor B (32) when they are placed side by side in the magnetic field loop. The end face thickening portion includes any one of the following: impeller outer end thickening portion, impeller radial side thickening portion, impeller radial side root thickening portion, and impeller shaft sleeve end face thickening portion. The thickening portion can be implemented on the impeller body or on the magnetic conductor provided on the impeller body.

[0087] The thickened portion at the outer end of the impeller, the thickened portion on the radial side of the impeller, the thickened portion at the root of the radial side of the impeller, and the thickened portion at the end face of the impeller bushing are used to ensure that the thickness of the corresponding part of the impeller can simultaneously cover the magnetic induction unit contained in magnetic sensor A and magnetic sensor B.

[0088] As a specific implementation of the thickened section, the thickened section at the outer end of the impeller is used as an example for explanation. (See [link to relevant documentation]). Figure 4 As shown.

[0089] The first magnetic blade (12) is a component of the magnetic circuit (1a) on the wheel. At least one side of its outer end has a magnetic boss (12a) or a magnetic boss (12b). The magnetic boss (12a) or the magnetic boss (12b) has the same outer end face (12c) as the first magnetic blade (12). The second magnetic blade (13) is a component of the magnetic circuit on the wheel (1a), and at least one side of its outer end has a magnetic boss (13a) or a magnetic boss (13b). The magnetic boss (13a) or the magnetic boss (13b) has the same outer end face (13c) as the second magnetic blade (13).

[0090] The method of identifying the temporal relationship between signal A and signal B and inferring the direction of water flow specifically includes one of the following methods: Counter triggering method: Connect signal A to the enable terminal of the forward counter, and connect signal B to the counting terminal of the forward counter. The rising edge of signal B during the high-level duration of signal A triggers the forward counter to perform addition counting; and / or Connect signal B to the enable terminal of the inverting counter and signal A to the counting terminal of the inverting counter. The rising edge of signal A during the high-level duration of signal B triggers the inverting counter to perform an increment count. If the count value of the forward counter increases, the water flow direction is identified as forward; if the count value of the inverting counter increases, the water flow direction is identified as reverse. Interrupt handling method: Connect signal A and signal B to two different interrupt inputs of the digital processor, or connect the output of signal A and signal B by performing a logical "OR" operation to the interrupt input of the digital processor; the digital processor responds to the interrupt generated by signal A and / or signal B by using the internal counters of the digital processor as on-chip forward counters and on-chip reverse counters, or by using the external counters of the digital processor as off-chip forward counters and off-chip reverse counters, and determines the water flow direction based on the relative level relationship between signal A and signal B.

[0091] Signals A and B output by the signal conditioning module (3) are used to trigger the forward counter (52) or the reverse counter (53) in the information processing module (5). See [link to relevant documentation]. Figure 9 As shown.

[0092] A method for identifying the direction of impeller rotation, comprising: If the count value of the forward counter (52) changes, it is identified as the impeller rotating forward (clockwise). If the count value of the reverse counter (53) changes, it is identified as impeller reverse transmission (rotation in the counterclockwise direction).

[0093] The interrupt handling method specifically includes: The method of connecting signals A and B to two different interrupt input terminals of the digital processor includes: Connection method one, connecting signals A and B to two different interrupt input terminals INT0 and INT1 of the digital processor, where interrupt input terminals INT0 and INT1 are used both to trigger interrupts from signals A and B and to read the levels of signals A and B. (See [link to previous section]). Figure 10 As shown; or In the second connection method, signals A and B are connected to two different interrupt input terminals INT0 and INT1 of the digital processor, respectively, and signals A and B are also connected to two different data input terminals D0 and D1 of the digital processor. The digital processor responds to the interrupts generated by signals A and B from INT0 and INT1, and reads the levels of signals A and B from data input terminals D0 and D1. The step of connecting the output terminal of the logical OR operation between signal A and signal B to the interrupt input terminal of the digital processor includes: In connection method three, signal A and signal B are respectively connected to the two input terminals of the logic "OR" circuit, the output terminal of the logic "OR" circuit is connected to the interrupt input terminal INT0 of the digital processor, and signal A and signal B connected to the two input terminals of the logic "OR" circuit are respectively connected to the two different data input terminals D0 and D1 of the digital processor. After responding to the interrupt request of the interrupt input terminal INT0, the digital processor reads the level of signal A and signal B from the data input terminals D0 and D1.

[0094] When using internal counters of the digital processor as on-chip forward and inverse counters, or using external counters of the digital processor as off-chip forward and inverse counters, the triggering methods for the counters include: Trigger the forward / reverse counter to count during each interruption caused by response signal A or signal B; or, The forward / reverse counter is triggered every N interrupts caused by response signal A or signal B, where N is a natural number greater than 1.

[0095] Furthermore, when the impeller rotates forward, the water flow direction is determined to be the normal water supply direction; when the impeller rotates in reverse, the water flow direction is determined to be the return flow direction, which is opposite to the normal water supply direction.

[0096] Furthermore, the water flow direction is determined based on the relationship between the impeller rotation direction and the water flow direction. The number of impeller rotations per unit time is recorded using an on-chip counter or an off-chip counter of the digital processor.

[0097] The interrupt handling method, which connects signal A and signal B to two different interrupt inputs of the digital processor, further includes: Interrupt handling method one: After responding to the interrupt request generated by signal A or signal B, mark the corresponding interrupt source as signal A or signal B according to the correspondence between signal A and signal B and the interrupt input terminal; Mark the interrupt trigger time, and mark the interrupt request trigger time value of signal A as T. A Mark the interrupt request trigger time value of signal B as T. B ; Using three or more arrivals sequentially in time, T A and T B The time series data, which together form the data, identifies the intra-group interruption interval t and the inter-group interruption interval T. Based on T with an intra-group interruption interval t A With T B The order in which they appear determines the direction of impeller rotation and water flow; or, Based on a pair of T with an intra-group interruption interval t A With T B One of them and another pair of T with an intra-group interruption interval t A With T B The order in which one of them occurs at present determines the direction of impeller rotation and water flow; The operation of connecting the output of the logical OR operation between signal A and signal B to the interrupt input of the digital processor, as described in the interrupt handling method, further includes: Interrupt handling method two involves reading the levels and corresponding interrupt trigger times of signals A and B during the interrupt response process to obtain the interrupt trigger time sequence (T) generated by signals A and B. A / B1 T A / B 2 T A / B 3 T A / B 4 ...); using three or more interrupt trigger times in the interrupt trigger time sequence, identify two interrupt triggers with a small time interval (T). A / B n ,T A / (B n+1) This constitutes a trigger within the group, where n is a natural number; If T A / B n If the level combination of the corresponding signal A and signal B is (1,0), then the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be in the forward direction. If T A / B n If the level combination of the corresponding signals A and B is (0,1), then the impeller is judged to be rotating in reverse, and the water flow direction is judged to be reversed.

[0098] Furthermore, the interrupt handling method described above uses three or more time-sequentially arriving nodes by T. A and T B The time series formed by these two methods is as follows: Record the interrupt trigger times of signals A and B, and denote the first interrupt trigger time generated by signals A and B as T. A1 T B1 The time of the second interrupt triggered by signals A and B is denoted as T. A2 T B2 The time of the third interrupt triggered by signals A and B is denoted as T. A3 T B3 .

[0099] Interrupt handling method one, based on T with an intra-group interrupt interval t A With T B The order in which they appear determines the direction of impeller rotation and water flow. The specific method is as follows: If T A1 <T B1 If so, the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be in the forward direction; If T B1 <T A1 If the impeller is reversed, the water flow direction is determined to be reversed.

[0100] The interrupt handling method described in section one is based on a pair of T values ​​with an intra-group interrupt interval t. A With T B One of them and another pair of T with an intra-group interruption interval t A With T B The direction of impeller rotation and water flow is determined by the order of events between two points in time. The specific method is as follows: If T A1 <T B1 <T A2 <T B2 ;or T B1 <T A2 <T B2 ;or T B1 <T A2 ; Then the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be positive. If T B1 <T A1 <T> B2 <T A2 ;or <T A1 <T> B2 <T A2;or <T A1 <T> B2 ; If the impeller is reversed, the water flow direction is determined to be reversed.

[0101] The interrupt handling method described in section two (T) A / B1 T A / B 2 T A / B 3 T A / B 4 T in ) A / B1 T A / B 2 T A / B 3 T A / B 4 This indicates the time when signal A or signal B triggers the 1st, 2nd, 3rd, and 4th interrupt.

[0102] Specifically, in T A / B n When the level combination of signal A and signal B is (1,0), it is the interrupt trigger signal generated by signal A, AA. Signal A is interrupted before signal B, and the impeller is in the forward rotation state. Specifically, in T A / B n When the level combination of signal A and signal B is (1,0), it is the interrupt trigger signal generated by signal B. Signal B is interrupted before signal A, and the impeller is in reverse rotation.

[0103] It also includes water flow measurement methods, specifically including: Read the increase in flow data of the reference flow meter and the increase in the number of trigger pulses recorded by the corresponding forward counter within the same reference time interval. Construct a forward water flow lookup table in a one-to-one correspondence between the increase in flow data and the increase in the number of trigger pulses, and store the forward water flow lookup table in the flow calibration data storage (54). The reference flow meter is inserted in series in the normal water supply direction of the pipeline where the impeller is located. and / or Read the flow increase data of the reference flow meter within the same reference time interval and the corresponding increase in the number of trigger pulses recorded by the reverse counter. Construct a reverse water flow lookup table in a one-to-one correspondence between the flow data increase and the number of trigger pulse increases, and store the reverse water flow lookup table in the flow calibration data storage (54). The reference flow meter is inserted in series in the opposite direction to the normal water supply of the pipeline where the impeller is located.

[0104] Figure 9 and Figure 10 The connection relationship between the flow calibration data storage (54) and the data processor (51) is given respectively.

[0105] Figure 2 and Figure 3The impeller support shaft (42) given is a hollow or solid circular cylindrical support body used to provide rotational support for the magnetic shaft sleeve (14); the water pipe wall (4) has a groove (41) for installing the wheel-side magnetic circuit module (1b).

[0106] The method and apparatus provided in this invention overcome at least one of the shortcomings of existing technologies, such as not supporting comprehensive detection of normal water supply flow and backflow in water pipes, high power consumption, and high cost. It features a simple structure, low power consumption, and easy installation and maintenance.

Claims

1. A method for detecting water flow direction, comprising: A magnetic transmission circuit (1) is configured, comprising an on-wheel magnetic circuit (1a) and a wheel-side magnetic circuit (1b). The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body. The wheel-side magnetic circuit (1b) is composed of a magnet, magnetic sensor A, and magnetic sensor B, or a magnet, magnetic sensor A, magnetic sensor B, and a magnetically conductive sheet. The specific implementation of the magnetic transmission circuit (1) includes: In one implementation method, the on-wheel magnetic circuit (1a) is set at the outer end of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the outer end face of the impeller blade; or, In the second implementation method, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade; or, In the third implementation method, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and on the outer end of the bushing connected thereto, and correspondingly, the wheel-side magnetic circuit (1b) is set on the outer side of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; or, In the fourth implementation method, the on-wheel magnetic circuit (1a) is set at the end of the impeller bushing, and the wheel-side magnetic circuit (1b) is set on the outside of the end face of the impeller bushing; By rotating the impeller, the relative positions of the magnetic circuit (1a) on the wheel and the magnetic circuit (1b) on the wheel side are changed, and the magnetic field circuit in the magnetic transmission circuit (1) is guided to switch from magnetic sensor A to magnetic sensor B in a soft switching manner. The magnetic induction signals output by magnetic sensor A and magnetic sensor B are amplified and shaped to obtain signal A and signal B; the temporal relationship between signal A and signal B is identified and the direction of water flow is inferred from it.

2. The method as described in claim 1, wherein, The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body. Specifically, Corresponding to the first implementation method, the on-wheel magnetic circuit (1a) includes two blades and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet fixed on two adjacent blades to form a magnetic passage. Corresponding to the second implementation method, the on-wheel magnetic circuit (1a) includes a blade made of magnetic material, or a magnetic sheet fixed to the side of the blade to form a magnetic path. Corresponding to implementation method three, the on-wheel magnetic circuit (1a) includes two blade bottoms and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet with both ends fixed to the bottoms of two adjacent blades and both end faces facing the axial direction of the impeller. Corresponding to implementation method four, the on-wheel magnetic circuit (1a) includes a bushing made of magnetically conductive material, or includes a magnetically conductive sheet fixed on the bushing to form a magnetic passage. The wheel-side magnetic circuit (1b) consists of a magnet, magnetic sensor A, and magnetic sensor B, or a magnet, magnetic sensor A, magnetic sensor B, and a magnetic conductive sheet. Specifically, Corresponding to the first implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the outer end of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the outer end of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the outer end of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is consistent with the radial direction of the blade. Corresponding to the second implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the radial side of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the radial direction of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the rotation direction of the blade. Corresponding to implementation method three, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located on the outer side of the radial side of the blade root, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the direction of blade rotation, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the direction of blade rotation. Corresponding to implementation mode four, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located outside the impeller shaft seat, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the impeller shaft sleeve. The magnetic field direction in the middle of the magnet or the middle of the magnetic conductive sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the impeller shaft sleeve, and the magnetic field direction at both ends of the magnet or the two ends of the magnetic conductive sheet is perpendicular to the rotation direction of the impeller shaft sleeve.

3. The method as described in claim 1, wherein, The magnetic field circuit within the guiding magnetic transmission channel switches from magnetic sensor A to magnetic sensor B via a soft-switching method, specifically including: During the first time interval, the magnetic field loop only covers sensor A or sensor B, that is, the magnetic field loop only has an output signal strength that exceeds the detection threshold at sensor A or sensor B. During the second time interval, the magnetic field loop simultaneously covers both sensor A and sensor B, meaning that the magnetic field loop has the ability to generate an output signal strength exceeding the detection threshold at both sensor A and sensor B. During the third time interval, the magnetic field loop only covers sensor B or sensor A, meaning that the magnetic field loop only has an output signal strength that exceeds the detection threshold at sensor A or sensor B.

4. The method of claim 3, wherein, During the second time interval, the magnetic field circuit simultaneously covers both magnetic sensor A (31) and magnetic sensor B (32), meaning that the magnetic field circuit has an output signal strength exceeding the detection threshold at both magnetic sensor A (31) and magnetic sensor B (32). Specifically, this includes the following steps: When magnetic sensor A (31) and magnetic sensor B (32) are placed side by side in the magnetic field circuit, the distance between their center points is less than the thickness of the end face of the magnetic circuit (1a) on the wheel that they face; or, An end face thickening portion is provided on the wheel portion corresponding to the magnetic circuit port portion in the wheel-side magnetic circuit (1b). The thickness of the end face thickening portion is greater than the distance between the center points of the magnetic sensor A (32) and the magnetic sensor B (32) when they are placed side by side in the magnetic field circuit. The end face thickening portion includes any one of the following: impeller outer end thickening portion, impeller radial side thickening portion, impeller radial side root thickening portion, and impeller shaft sleeve end face thickening portion. The thickening portion can be implemented on the impeller body or on the magnetic conductor provided on the impeller body.

5. The method as described in claim 1, wherein, The method of identifying the temporal relationship between signal A and signal B and inferring the direction of water flow specifically includes one of the following methods: Counter triggering method: Connect signal A to the enable terminal of the forward counter, and connect signal B to the counting terminal of the forward counter. The rising edge of signal B during the high-level duration of signal A triggers the forward counter to perform addition counting; and / or Connect signal B to the enable terminal of the inverting counter and signal A to the counting terminal of the inverting counter. The rising edge of signal A during the high-level duration of signal B triggers the inverting counter to perform an increment count. If the count value of the forward counter increases, the water flow direction is identified as forward; if the count value of the inverting counter increases, the water flow direction is identified as reverse. Interrupt handling method: Connect signal A and signal B to two different interrupt input terminals of the digital processor respectively, or connect the output terminal of signal A and signal B through a logical "OR" operation to the interrupt input terminal of the digital processor; use the internal counters of the digital processor as on-chip forward counters and on-chip reverse counters, or use the external counters of the digital processor as off-chip forward counters and off-chip reverse counters; The digital processor responds to interrupt requests generated by signal A and / or signal B, and determines the water flow direction based on the relative time relationship between the high levels of signal A and signal B.

6. The method of claim 5, wherein, The operation of connecting signal A and signal B to two different interrupt input terminals of the digital processor further includes: Interrupt handling method one: After responding to the interrupt request generated by signal A or signal B, mark the corresponding interrupt source as signal A or signal B according to the correspondence between signal A and signal B and the interrupt input terminal; Mark the interrupt trigger time, and mark the interrupt request trigger time value of signal A as T. A Mark the interrupt request trigger time value of signal B as T. B ; Using three or more arrivals sequentially in time, T A and T B The time series data, which together form the data, identifies the intra-group interruption interval t and the inter-group interruption interval T. Based on T with an intra-group interruption interval t A With T B The order in which they appear determines the direction of impeller rotation and water flow; or, Based on a pair of T with an intra-group interruption interval t A With T B One of them and another pair of T with an intra-group interruption interval t A With T B The order in which one of them occurs at present determines the direction of impeller rotation and water flow; The operation of connecting the output terminal of the logical "OR" operation between signal A and signal B to the interrupt input terminal of the digital processor further includes: Interrupt handling method two involves reading the levels and corresponding interrupt trigger times of signals A and B during the interrupt response process to obtain the interrupt trigger time sequence (T) generated by signals A and B. A / B1 T A / B 2 T A / B 3 T A / B 4 ...); using three or more interrupt trigger times in the interrupt trigger time sequence, identify two interrupt triggers with a small time interval (T). A / B n ,T A / (B n+1) This constitutes a trigger within the group, where n is a natural number; If T A / B n If the level combination of the corresponding signal A and signal B is (1,0), then the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be in the forward direction. If T A / B n If the level combination of the corresponding signals A and B is (0,1), then the impeller is judged to be rotating in reverse, and the water flow direction is judged to be reversed.

7. A water flow direction detection device, comprising: The system comprises a magnetic transmission circuit (1), a signal conditioning module (3), and an information processing module (5); among which, The magnetic transmission circuit (1) includes a magnetic circuit on the wheel (1a) and a magnetic circuit on the wheel side (1b), wherein, The on-wheel magnetic circuit (1a) is composed of an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body; The wheel-side magnetic circuit (1b) consists of a magnet (2), a magnetic sensor A (31) and a magnetic sensor B (32), or a magnet (2), a magnetic sensor A (31), a magnetic sensor B (32) and a magnetic conductive sheet (11); Specifically, the magnetic transmission loop (1) includes any one of the following four implementation methods: In one implementation method, the on-wheel magnetic circuit (1a) is set at the outer end of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the outer end face of the impeller blade; or, In the second implementation method, the on-wheel magnetic circuit (1a) is set on the radial side of the impeller blade, and the corresponding wheel-side magnetic circuit (1b) is set on the outer side of the radial side of the impeller blade; or, In the third implementation method, the on-wheel magnetic circuit (1a) is set on the bottom of the radial side of the impeller blade and on the outer end of the bushing connected thereto, and correspondingly, the wheel-side magnetic circuit (1b) is set on the outer side of the outer end of the bushing connected to the bottom of the radial side of the impeller blade; or, In the fourth implementation method, the on-wheel magnetic circuit (1a) is set at the end of the impeller bushing, and the wheel-side magnetic circuit (1b) is set on the outside of the end face of the impeller bushing; The signal conditioning module (3) includes a signal amplification circuit and a voltage comparison circuit. Its input terminal is electrically connected to magnetic sensor A (31) and magnetic sensor B (32), and its output terminal is electrically connected to the input terminal of the information processing module (5). By rotating the impeller, the relative positions of the magnetic circuit on the wheel (1a) and the magnetic circuit on the wheel side (1b) are changed, and the magnetic field circuit in the magnetic transmission circuit (1) is guided to switch from magnetic sensor A (31) to magnetic sensor B (32) in a soft switching manner. The signal conditioning module (3) amplifies and shapes the magnetic induction signals output by magnetic sensor A31) and magnetic sensor B32) to obtain signal A and signal B; The information processing module (5) uses the timing relationship between signal A and signal B to identify the impeller rotation direction and infers the water flow direction based on the impeller rotation direction.

8. The water flow direction detection device according to claim 7, wherein, The on-wheel magnetic circuit (1a) includes an impeller body made of magnetically conductive material or magnetically conductive material mounted on the impeller body. Specifically, Corresponding to the first implementation method, the on-wheel magnetic circuit (1a) includes two blades and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet fixed on two adjacent blades to form a magnetic passage. Corresponding to the second implementation method, the on-wheel magnetic circuit (1a) includes a blade made of magnetic material, or a magnetic sheet fixed to the side of the blade to form a magnetic path. Corresponding to implementation method three, the on-wheel magnetic circuit (1a) includes two blade bottoms and a bushing made of magnetically conductive material, or includes a U-shaped magnetically conductive sheet with both ends fixed to the bottoms of two adjacent blades and both end faces facing the axial direction of the impeller. Corresponding to implementation method four, the on-wheel magnetic circuit (1a) includes a bushing made of magnetically conductive material, or includes a magnetically conductive sheet fixed on the bushing to form a magnetic passage. The wheel-side magnetic circuit (1b) includes a magnet, magnetic sensor A, and magnetic sensor B, or includes a magnet, magnetic sensor A, magnetic sensor B, and a magnetic conductive sheet. Specifically, Corresponding to the first implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the outer end of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the outer end of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the outer end of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is consistent with the radial direction of the blade. Corresponding to the second implementation method, the magnetic circuit (1b) on the wheel side includes a magnet, a magnetic sensor A and a magnetic sensor B, or the magnetic circuit consisting of a magnet, a magnetic sensor A, a magnetic sensor B and a magnetic conductive sheet is located on the outer side of the radial side of the blade, and the arrangement direction of the magnetic sensor A and the magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the radial direction of the blade, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the rotation direction of the blade. Corresponding to implementation method three, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located on the outer side of the radial side of the blade root, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the radial side of the blade. The magnetic field direction in the middle of the magnet or the middle of the magnetic sheet in the wheel-side magnetic circuit (1b) is consistent with the direction of blade rotation, and the magnetic field direction at both ends of the magnet or the magnetic sheet is perpendicular to the direction of blade rotation. Corresponding to implementation mode four, the magnetic circuit (1b) on the wheel side includes a magnet, magnetic sensor A and magnetic sensor B, or the magnetic circuit consisting of a magnet, magnetic sensor A, magnetic sensor B and magnetic conductive sheet is located outside the impeller shaft seat, and the arrangement direction of magnetic sensor A and magnetic sensor B is consistent with the direction of rotation of the impeller shaft sleeve. The magnetic field direction in the middle of the magnet or the middle of the magnetic conductive sheet in the wheel-side magnetic circuit (1b) is consistent with the rotation direction of the impeller shaft sleeve, and the magnetic field direction at both ends of the magnet or the two ends of the magnetic conductive sheet is perpendicular to the rotation direction of the impeller shaft sleeve.

9. The apparatus according to claim 7, wherein, The on-wheel magnetic circuit (1a) and the wheel-side magnetic circuit (1b) have the following relative positional relationship: Within the first time interval, there is a first relative positional relationship between the on-wheel magnetic circuit (1a) and the wheel-side magnetic circuit (1b). Under the first relative positional relationship, the magnetic circuit end face of the on-wheel magnetic circuit (1a) only covers sensor A (31) or sensor B (32). That is, the magnetic circuit end face of the on-wheel magnetic circuit (1a) only has an output signal strength that exceeds the detection threshold at sensor A (31) or sensor B (32). During the second time interval, the magnetic circuit on the wheel (1a) and the magnetic circuit on the side of the wheel (1b) have a second relative position relationship. The magnetic circuit end face included in the magnetic circuit on the wheel (1a) simultaneously covers sensor A (31) and sensor B (32). That is, the magnetic field loop has an output signal strength that exceeds the detection threshold at both sensor A (31) and sensor B (32). During the third time interval, the magnetic circuit on the wheel (1a) and the magnetic circuit on the side of the wheel (1b) have a third relative positional relationship. The magnetic circuit end face included in the magnetic circuit on the wheel (1a) only covers sensor B (32) or sensor A (31). That is, the magnetic field loop only has an output signal strength that exceeds the detection threshold at sensor A (31) or sensor B (32).

10. The apparatus according to claim 9, wherein, The on-wheel magnetic circuit (1a) and the wheel-side magnetic circuit (1b) have the following coverage relationship: The magnetic circuit end face of the on-wheel magnetic circuit (1a) covers the sensor A (31) and sensor B (32) included in the wheel-side magnetic circuit (1b), specifically: When magnetic sensors A (32) and B (32) are placed side by side in a magnetic field loop, the distance between their center points is less than the thickness of the end face of the magnetic circuit contained in the magnetic circuit (1a) on the wheel they face; or, An end face thickening portion is provided at the magnetic circuit port of the on-wheel magnetic circuit (1a) corresponding to the location of sensor A (31) and sensor B (32) included in the wheel-side magnetic circuit (1b). The thickness of the end face thickening portion is greater than the distance between the center points of magnetic sensor A (32) and magnetic sensor B (32) when they are placed side by side in the magnetic field loop. The end face thickening portion includes any one of the following: impeller outer end thickening portion, impeller radial side thickening portion, impeller radial side root thickening portion, and impeller shaft sleeve end face thickening portion. The thickening portion can be implemented on the impeller body or on the magnetic conductor provided on the impeller body.

11. The apparatus according to claim 7, wherein, The information processing module (5) is used to perform the operation of identifying the temporal relationship between signal A and signal B and inferring the direction of water flow, specifically including the following steps: Counter triggering method: Connect signal A to the enable terminal of the forward counter, and connect signal B to the counting terminal of the forward counter. The rising edge of signal B during the high-level duration of signal A triggers the forward counter to perform addition counting; and / or Connect signal B to the enable terminal of the inverting counter and signal A to the counting terminal of the inverting counter. The rising edge of signal A during the high-level duration of signal B triggers the inverting counter to perform an increment count. If the count value of the forward counter increases, the water flow direction is identified as forward; if the count value of the inverting counter increases, the water flow direction is identified as reverse. Interrupt handling method: Connect signal A and signal B to two different interrupt input terminals of the digital processor, or connect the output terminal of signal A and signal B through a logical "OR" operation to the interrupt input terminal of the digital processor; the digital processor responds to the interrupt request generated by signal A and / or signal B, and determines the water flow direction based on the relative time relationship between the high levels of signal A and signal B.

12. The apparatus according to claim 11, wherein, The information processing module (5) includes a data processor (51) for performing at least one of the two operations described in Interrupt Processing Method 1 and Interrupt Processing Method 2, specifically including: Interrupt handling method one: After the data processor (51) responds to the interrupt request generated by signal A or signal B, it marks the corresponding interrupt source as signal A or signal B according to the correspondence between signal A and signal B and the interrupt input terminal. Mark the interrupt trigger time, and mark the interrupt request trigger time value of signal A as T. A Mark the interrupt request trigger time value of signal B as T. B ; Using three or more arrivals sequentially in time, T A and T B The time series data, which together form the data, identifies the intra-group interruption interval t and the inter-group interruption interval T. Based on T with an intra-group interruption interval t A With T B The order in which they appear determines the direction of impeller rotation and water flow; or, Based on a pair of T with an intra-group interruption interval t A With T B One of them and another pair of T with an intra-group interruption interval t A With T B The order in which one of them occurs at present determines the direction of impeller rotation and water flow; Interrupt handling method two: During the interrupt response process, the data processor (51) reads the levels and corresponding interrupt trigger times of signals A and B that generated the interrupt, and obtains the interrupt trigger time sequence (T) generated by signals A and B. A / B1 T A / B 2 T A / B 3 T A / B 4 ...); using three or more interrupt trigger times in the interrupt trigger time sequence, identify two interrupt triggers with a small time interval (T). A / B n ,T A / (B n+1) This constitutes a trigger within the group, where n is a natural number; If T A / B n If the level combination of the corresponding signal A and signal B is (1,0), then the impeller is judged to be rotating in the forward direction, and the water flow direction is judged to be in the forward direction. If T A / B n If the level combination of the corresponding signals A and B is (0,1), then the impeller is judged to be rotating in reverse, and the water flow direction is judged to be reversed.

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