Spur gear liquid flow detection device

Abstract

The present application relates to flow detection device technical field, especially to a spur gear liquid flow detection device, the spur gear liquid flow detection device includes: gear assembly, including meshing transmission gear piece, the end face of gear piece is provided with magnet assembly, in the non-axis position of gear piece under the rotating state, the magnetic field formed by magnet assembly has the magnetic induction intensity of change; Detection assembly is arranged correspondingly with magnet assembly, to detect the magnetic induction intensity change of gear assembly under the rotating state, to obtain the accurate rotation number and / or angle of gear piece, when the liquid pushes the gear to rotate, the magnet assembly rotates with the gear, so that the magnetic induction intensity detected by the detection assembly is changed, to accurately judge the rotation condition of the gear, avoid the occurrence of the situation of missing detection, so as to improve the accuracy and accuracy of the spur gear liquid flow detection device for liquid flow detection.

Description

Technical Field

[0001] This invention relates to the field of flow detection equipment technology, and in particular to a spur gear liquid flow detection device. Background Technology

[0002] High-pressure hydraulic systems or liquid delivery systems require precise measurements to ensure data reliability. Currently, only some institutions and university laboratories can perform accurate liquid measurements under specific conditions. Once the boundary conditions change, both the measurement accuracy and repeatability will deviate.

[0003] Spur gear flow meters offer high precision and can theoretically measure any liquid. The flowing liquid drives the gears to rotate along their shaft. Each tooth's movement is detected by an external flow meter sensor, which reads the tooth pulse. Each pulse corresponds to a precise volume of liquid being measured. As liquid flows continuously, the flow rate is calculated by counting the number of pulses per unit time. Spur gear flow meters calculate flow rate by measuring the number of teeth (n) of the two circular gears and multiplying it by the volume (v) formed by the tooth grooves and sidewalls. To improve measurement accuracy or detection accuracy at low flow rates, the volume (v) needs to be reduced. This requires a reduction in the tooth area, which can lead to non-contact sensors failing to detect gear rotation or missing teeth, thus affecting the flow meter's accuracy. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a spur gear liquid flow detection device to solve the problem that when existing gear flow meters perform flow detection, the sensor may fail to detect gear rotation or miss teeth, thus affecting the flow detection accuracy of the flow meter.

[0005] This invention provides a spur gear liquid flow detection device, the spur gear liquid flow detection device comprising:

[0006] A gear assembly includes meshing gears, and a magnet assembly is provided on the end face of the gears. When the gears are in a rotating state and at a non-axial position, the magnetic field formed by the magnet assembly has a varying magnetic induction intensity.

[0007] A detection component is provided corresponding to the magnet component to detect the change in magnetic induction intensity of the gear component in a rotating state, thereby obtaining the accurate number of rotations and / or angle of the gear component.

[0008] Preferably, when the gear assembly is rotating, the detection component detects that the magnetic induction intensity of the magnetic field is distributed in a wavy curve; the wavy curve has multiple peaks and multiple troughs, each peak and each trough corresponding to a different position on the end face of the gear, so that the detection component determines the number of rotations and / or angle of the gear based on the position corresponding to a certain peak or trough when the gear rotates.

[0009] Preferably, the magnet assembly includes a bipolar magnet, with its two ends forming N poles and S poles respectively; the end face of the gear component facing the detection assembly has a groove for the magnet to be inserted, and the end of the magnet near the detection assembly is formed with an N pole or an S pole.

[0010] Preferably, multiple magnets are provided, and the polarities of the multiple magnets are alternately arranged, so that multiple adjacent magnets attract each other to form a connected magnetic induction intensity curve; along the plane where the detection component is located, the magnetic field lines with the same direction and used to represent the direction of magnetic induction intensity are connected to form a sinusoidal curve.

[0011] Preferably, the plurality of magnets are evenly distributed in a ring around the axis of the gear component, and the magnets are arranged in a one-to-one correspondence with the teeth of the gear component.

[0012] Preferably, the gear assembly includes a plurality of meshing gears, and at least one of the gears has the magnet assembly disposed on its end face;

[0013] The detection component corresponds one-to-one with the gear component on which the magnet component is provided, and the detection component and the magnet component are located on the same side of the gear component.

[0014] Preferably, the spur gear liquid flow detection device further includes a housing for accommodating the gear assembly and the detection assembly; the housing forms a sealed receiving cavity for liquid flow, and the gear assembly is disposed inside the receiving cavity; the housing also forms a detection cavity for accommodating the detection assembly, and the detection cavity is separated from the receiving cavity and forms a predetermined distance.

[0015] Preferably, the box is formed as a split structure, and the split structure of the box includes a first box, a second box and a third box that are stacked and attached together;

[0016] The second housing is formed into a ring structure. The end face of the first housing, the ring wall of the second housing, and the end face of the third housing together form the receiving cavity. The two end faces of the gear component embedded in the receiving cavity are respectively attached to the end faces of the first housing and the third housing.

[0017] The magnet assembly embedded in the receiving cavity is attached to the end face of the first housing. The end face of the first housing facing away from the magnet assembly is recessed into its main body to form the detection cavity. The detection cavity is formed as a blind hole structure, and the bottom of the blind hole structure and the magnet assembly form the predetermined distance.

[0018] Preferably, the detection component includes a protective shell and a sensor and a chip disposed within the protective shell; the outer wall of the protective shell conforms to the detection cavity, the sensor is electrically connected to the chip, and the detection component applies the Hall effect detection principle.

[0019] Preferably, the gear component is formed as a spur round gear, and an inlet and an outlet are formed on both sides of the meshing part of the gear component, respectively. The rotation of the gear assembly causes the liquid to be squeezed from the inlet to the outlet.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The spur gear liquid flow detection device of the present invention has a magnet assembly with varying magnetic induction intensity on the surface of the gear. When the liquid drives the gear to rotate, the magnet assembly rotates together with the gear, so that the magnetic induction intensity detected by the detection assembly is changing. Therefore, it can accurately determine the number of rotations and / or angle of the gear, so as to avoid the occurrence of undetectable or missed detections, thereby improving the accuracy and precision of the spur gear liquid flow detection device for liquid flow detection.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of a spur gear liquid flow detection device provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the spur gear liquid flow detection device provided in an embodiment of the present invention from another perspective;

[0026] Figure 3 for Figure 2 Sectional view of the structure at point A in the middle;

[0027] Figure 4 A schematic diagram of a gear component structure with a magnet assembly provided in a spur gear liquid flow detection device according to an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the magnetic induction intensity formed by the magnet assembly of the spur gear liquid flow detection device provided in an embodiment of the present invention.

[0029] Icons: 10-Gear assembly; 11-Gear component; 12-Gear shaft; 13-Bearing; 20-Magnet assembly; 21-Magnet; 30-Detection component; 31-Protective shell; 32-Sensing element; 33-Chip; 40-Box; 41-First box; 42-Second box; 43-Third box; 44-Guide part; 45-Mounting part; 46-Sealing part; 50-Fastener. Detailed Implementation

[0030] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0031] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0032] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0033] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0034] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0035] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0036] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0037] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0038] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0039] According to the present invention, a spur gear liquid flow detection device is provided, which includes a gear assembly 10, a magnet assembly 20 and a detection assembly 30.

[0040] The specific structure of the above-described components of the spur gear liquid flow detection device according to this embodiment will be described below.

[0041] In this embodiment, as Figures 1 to 5 As shown, the gear assembly 10 includes a meshing gear 11 and a gear shaft 12 assembled with the gear 11. The gear 11 can rotate around the gear shaft 12. A bearing 13 is also provided between the gear 11 and the gear shaft 12 to support the gear. Two bearings 13 can be provided, and the two bearings 13 are respectively provided corresponding to the two end faces of the gear 11. The gear 11 is preferably formed as a spur gear to ensure that the gear assembly 10 has meshing teeth at any instant of rotation, so as to improve the flow detection accuracy of the detection component 30.

[0042] In this embodiment, as Figures 1 to 3 As shown, the detection component 30 includes a protective shell 31 and a sensor 32 and a chip 33 disposed within the protective shell 31. The outer wall of the protective shell 31 conforms to the detection cavity to ensure that the detection component 30 is securely installed with the housing 40. The sensor 32 and the chip 33 are electrically connected. The detection component 30 uses the Hall effect detection principle to detect the number of teeth rotated by the gear component 11. Correspondingly, the sensor 32 is formed as a Hall sensor, and the chip 33 is formed as a Hall chip to store and process the data detected by the Hall sensor. The data can be collected and calculated by the host computer to obtain accurate flow data.

[0043] In this embodiment, as Figures 1 to 5 As shown, a magnet assembly 20 is provided on the end face of the gear component 11. The magnetic field formed by the magnet assembly 20 has a changing magnetic induction intensity. The detection component 30 is correspondingly provided with the magnet assembly 20 to detect the change in magnetic induction intensity of the gear component 10 in a rotating state, thereby obtaining the accurate number of rotations and / or angle of the gear component 11. When liquid flows into the gear component 10, it pushes the meshing gear component 11 to rotate. The gear component 11 drives the magnetic field formed by the magnet assembly 20 to rotate together. Since the magnetic induction intensity of the magnetic field at any non-axial position on the gear component 11 is changing in the rotating state of the gear component 10, the parameter detected by the detection component 30 is a continuously changing value, that is, a high and low level is formed in the signal port of the detection component 30, thereby analyzing and calculating the accurate number of rotations and / or angle of the gear component 11, and thus obtaining the accurate flow parameters.

[0044] It should be noted that the gear assembly 10 is preferably a gear component 11 with the same size and number of teeth for meshing transmission, so as to improve the accuracy of liquid flow detection.

[0045] In this embodiment, as Figures 1 to 5 As shown, the gear assembly 10 includes multiple meshing gear components 11, and at least one gear component 11 has a magnet assembly 20 disposed on its end face. Detection components 30 correspond one-to-one with the gear components 11 with magnet assemblies 20, and the detection components 30 and magnet assemblies 20 are disposed on the same side of the gear components 11. In a preferred embodiment, the gear assembly 10 includes two meshing gear components 11. When a magnet assembly 20 is disposed on the end face of either gear component 11, one detection component 30 is used, and the liquid flow rate can be measured by detecting the number of rotations and / or angle of one gear component 11. When both gear components 11 have magnet assemblies 20 disposed on their end faces, two detection components 30 are used, and the two detection components 30 respectively detect the number of rotations and / or angle of their corresponding gear components 11. While performing the detection, the parameters detected by the two detection components 30 can also be verified, thus improving the accuracy of the detection results.

[0046] It should be noted that when there are two magnet components 20 and two detection components 30, the magnet components 20 are set at both ends of the gear assembly 10 along its length to avoid the two detection components 30 being too close together and their detection ranges affecting each other, which would lead to a decrease in detection accuracy.

[0047] In contrast, existing gear flow meters are equipped with multiple detection devices, while this application can achieve high-precision flow measurement by setting a single detection component 30.

[0048] To improve the accuracy of the detection results, in this embodiment, as follows: Figure 1 , Figure 4 and Figure 5 As shown, when the gear assembly 10 is rotating, the detection component 30 detects a wavy curve distribution of the changing magnetic induction intensity. The wavy curve has multiple peaks and troughs, and each peak and trough corresponds to a different position on the end face of the gear component 11. This allows the detection component 30 to determine the number of rotations and / or angle of the gear component 11 based on the position corresponding to a certain peak or trough. That is, as the gear component 11 rotates, the magnitude of the magnetic induction intensity detected by the detection component 30 exhibits a cyclical pattern of increasing-decreasing-increasing-decreasing (or decreasing-increasing-decreasing-increasing). This allows the detection component 30 to determine the rotational displacement of the gear component 11 based on the magnetic induction intensity (such as the detected peak value, i.e., the magnetic induction intensity at the peak or trough position), thereby accurately calculating the flow rate of the hydraulic fluid.

[0049] To obtain a magnetic flux density distribution with a wavy curve, in this embodiment, as follows: Figure 1 , Figure 4 and Figure 5As shown, the magnet assembly 20 includes a bipolar magnet 21, which can be made of materials such as iron, cobalt, or nickel and magnetized. The magnet 21 has N and S poles at its two ends, respectively. The gear component 11 has a groove on its end face facing the detection assembly 30 for the magnet 21 to be inserted into. The end of the magnet 21 near the detection assembly 30 has either an N or S pole. The shape of the magnet 21 matches the shape of the groove to ensure that the magnet 21 is securely installed on the gear component 11. The depth of the groove matches the height of the magnet 21, making the end face of the magnet 21 flush with the end face of the gear component 11.

[0050] It should be noted that, in the preferred embodiment, the magnetic induction intensity is distributed in a regular wavy curve to improve the detection accuracy of the detection component 30. Furthermore, the magnet component 20, which enables the magnetic induction intensity to form a regular wavy curve distribution, can be configured as a ring structure. Magnetization is performed along the height of the ring structure, and different magnetization directions allow the end of the magnet component 20 facing the detection component 30 to be formed as an N pole or a S pole. By performing forward and reverse magnetization along the height of the ring structure, multiple N pole and S pole portions are formed on the ring structure. The N pole and S pole portions are interleaved on the ring structure, and the amount of magnetization in each portion is equal, thus enabling the magnet component 20 to form a regular wavy curve distribution of magnetic induction intensity.

[0051] For ease of preparation and cost-saving purposes, in this embodiment, as follows: Figure 1 and Figure 4 As shown, multiple magnets 21 are arranged with alternating polarities, so that adjacent magnets 21 attract each other to form a connected magnetic induction intensity curve; in a preferred embodiment, such as Figure 5 As shown, the size and magnetization of the multiple magnets 21 are consistent, so that the magnetic field lines along the plane where the detection component 30 is located, which are in the same direction and are used to represent the direction of magnetic induction intensity, are connected in a sinusoidal curve. It should be noted that the same direction means that the N pole and S pole of the adjacent magnets 21 attract each other and can be connected to form a curve; the sinusoidal curve shape only means that the curve fluctuates up and down.

[0052] It should be further explained that magnetic field lines do not actually exist; they are a concept introduced to represent the intensity of magnetic flux. The density of magnetic field lines reflects the magnitude of the magnetic flux, and the direction of the magnetic field lines reflects the direction of the magnetic flux.

[0053] In a preferred embodiment, such as Figure 4As shown, multiple magnets 21 are evenly distributed in a ring around the axis of gear 11. The magnets 21 are arranged in a one-to-one correspondence with the teeth of gear 11, so that when the detection component 30 detects a peak value of magnetic induction intensity (the peak value includes the maximum and minimum values), it indicates the displacement of gear 11 as it rotates through one tooth. Therefore, the detection component 30 can count the total number of teeth rotated by gear 11 to further improve the accuracy of flow detection.

[0054] It should be noted that multiple magnets 21 can be disposed on the gear teeth or on the end face of the gear. Disposing them on the end face of the gear avoids the need for slotting on the gear teeth, thereby ensuring the strength of the gear component 11 and extending its service life. In addition, since the gear shaft 12 rotates together with the gear component 11, multiple magnets 21 can also be disposed on the gear shaft 12, and the detection component 30 corresponds to the magnets 21 on the gear shaft 12.

[0055] In this embodiment, as Figures 1 to 3 As shown, the spur gear liquid flow detection device also includes a housing 40 for accommodating the gear assembly 10 and the detection assembly 30; the housing 40 forms a sealed receiving cavity for liquid flow, and the gear assembly 10 is disposed inside the receiving cavity; the housing 40 also forms a detection cavity for accommodating the detection assembly 30, the detection cavity is separated from the receiving cavity and forms a predetermined distance, the predetermined distance ensures that the detection assembly 30 can detect the magnetic induction intensity and can detect the change of magnetic induction intensity, thereby realizing high-precision measurement of liquid flow.

[0056] It should be noted that the set value of the predetermined spacing is related to the magnitude of the magnetic induction intensity formed by the magnet assembly 20. As long as the detection assembly 30 can detect the magnetic induction intensity and detect the change in magnetic induction intensity, it is acceptable.

[0057] For ease of assembly, in this embodiment, as follows: Figures 1 to 3 As shown, the housing 40 is formed as a split structure, which includes a first housing 41, a second housing 42 and a third housing 43 stacked and attached together, that is, the second housing 42 is sandwiched between the first housing 41 and the third housing 43; the second housing 42 is formed as a ring structure, and the end face of the first housing 41, the ring wall of the second housing 42 and the end face of the third housing 43 together form a receiving cavity, and the two end faces of the gear 11 embedded in the receiving cavity are respectively attached to the end face of the first housing 41 and the end face of the third housing 43.

[0058] To improve the sealing of the cavity, such as Figure 1 and Figure 3As shown, the housing 40 is also provided with a sealing part 46 surrounding the outer edge of the receiving cavity. The sealing part 46 is formed into a ring structure and is respectively sandwiched between the first housing 41 and the second housing 42 and between the second housing 42 and the third housing 43, so as to surround the receiving cavity and ensure the sealing of the cavity. The sealing part 46 can be respectively disposed at the top of the second housing 42 and the third housing 43. Correspondingly, the spur gear liquid flow detection device also includes a sealing element (not shown), which is formed of an elastic material and is compressedly embedded in the sealing part 46 to ensure the sealing of the receiving cavity.

[0059] Furthermore, in this embodiment, such as Figures 1 to 3 As shown, the magnet assembly 20 embedded in the receiving cavity is attached to the end face of the first housing 41. The end face of the first housing 41 facing away from the magnet assembly 20 is recessed into its main body to form a detection cavity. The detection cavity is formed as a blind hole structure, and a predetermined distance is formed between the bottom of the blind hole structure and the magnet assembly 20.

[0060] In this embodiment, an inlet and an outlet (not shown) are formed on both sides of the meshing part of the gear component 11. The inlet and outlet are formed in the receiving cavity. The rotation of the gear assembly 10 causes the liquid to be squeezed from the inlet to the outlet.

[0061] Furthermore, in this embodiment, such as Figures 1 to 3 As shown, the housing 40 also has a guide portion 44 and a mounting portion 45 formed along its height. The guide portion 44 extends from the bottom of the first housing 41 through the second housing 42 and to the top of the third housing 43. When assembling the housing 40, the guide portion 44 can be used as a reference for alignment, improving the assembly accuracy of the first housing 41, the second housing 42, and the third housing 43. The mounting portion 45 is formed as a hole-like structure, extending through the first housing 41 or the third housing 43 and onto the second housing 42. The fastener 50 is formed as a screw structure, and the fastener 50 forms a threaded connection with the mounting portion 45, allowing the first housing 41 and the third housing 43 to be securely connected to the second housing 42. Alternatively, the mounting portion 45 can be formed as a countersunk hole structure, allowing the fastener 50 to be fully embedded in the housing 40, improving the aesthetics of the flow detection device.

[0062] It should be noted that multiple guide portions 44 and mounting portions 45 are formed, and multiple guide portions 44 and mounting portions 45 are arranged around the receiving cavity. In the preferred embodiment, multiple guide portions 44 and multiple mounting portions 45 are interleaved to ensure that the housing 40 has good assembly accuracy and is firmly assembled.

[0063] The spur gear liquid flow detection device according to the present invention is easy to manufacture, flexible in application, and highly applicable. A magnet component with varying magnetic induction intensity is provided on the surface of the gear. When the liquid drives the gear to rotate, the magnet component rotates together with the gear, so that the magnetic induction intensity detected by the detection component changes. Therefore, it can accurately determine the number of rotations and / or angle of the gear, so as to avoid the occurrence of undetectable or missed detections, thereby improving the accuracy and precision of the spur gear liquid flow detection device for liquid flow detection.

[0064] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A spur gear liquid flow detection device, characterized by, The straight gear liquid flow detection device comprises: A gear assembly comprising meshing gear pieces, an end surface of the gear pieces being provided with a magnet assembly, the magnet assembly forming a magnetic field with varying magnetic induction intensity at a non-axis position of the gear pieces in a rotating state; A detection assembly corresponding to the magnet assembly to detect the change of the magnetic induction intensity of the gear assembly in a rotating state, so as to obtain the accurate number of rotations and / or angle of the gear pieces; In the rotating state of the gear assembly, the detection assembly detects that the magnetic induction intensity of the magnetic field is distributed in a wavy curve; the wavy curve is formed with a plurality of wave crests and a plurality of wave troughs, each of the wave crests and each of the wave troughs corresponding to different positions of the end surface of the gear pieces, so that the detection assembly determines the number of rotations and / or angle of the gear pieces according to the gear pieces rotating to a position corresponding to the wave crest or the wave trough; The magnet assembly comprises magnets with two polarities, two ends of the magnets being formed into N and S poles respectively; the end surface of the gear pieces facing the detection assembly is formed with a groove for embedding the magnets, and the end of the magnet close to the detection assembly is formed into an N or S pole; The magnets are provided in plurality, the polarities of the plurality of magnets being alternately arranged, so that the plurality of adjacent magnets attract each other to form a connected magnetic induction intensity curve; along the plane where the detection assembly is located, magnetic induction lines with the same direction and used to represent the direction of magnetic induction intensity are connected into a similar sinusoidal curve shape; The plurality of magnets are uniformly distributed in a ring shape with the axis of the gear pieces as the center, and the magnets are one-to-one corresponding to the gear teeth of the gear pieces, so that the detection assembly counts the total number of teeth rotated by the gear pieces; The straight gear liquid flow detection device further comprises a box for accommodating the gear assembly and the detection assembly; the box is formed with a closed containing cavity for liquid flow, and the gear assembly is arranged inside the containing cavity; the box is further formed with a detection cavity for accommodating the detection assembly, the detection cavity being separated from the containing cavity and being formed with a predetermined distance; the detection assembly comprises a protective shell, and an induction piece and a chip arranged in the protective shell.

2. The spur gear liquid flow detection device of claim 1, wherein, The gear assembly comprises a plurality of gear pieces meshing with each other, and the end surface of at least one of the gear pieces is provided with the magnet assembly; The detection assembly corresponds to the gear pieces provided with the magnet assembly one-to-one, and the detection assembly and the magnet assembly are arranged on the same side of the gear pieces.

3. The spur gear liquid flow detection device of claim 1, wherein, The box is formed in a split structure, and the split structure comprises a first box, a second box and a third box arranged in a laminated manner; The second box is formed in a ring structure, and the end surface of the first box, the ring wall of the second box and the end surface of the third box jointly enclose the containing cavity, and the two end surfaces of the gear pieces embedded in the containing cavity are laminated with the end surface of the first box and the end surface of the third box respectively; The magnet assembly embedded in the accommodating cavity is attached to the end face of the first box body, the end face of the first box body away from the magnet assembly is recessed to the main body to form the detection cavity, the detection cavity is formed as a blind hole structure, and the bottom of the blind hole structure and the magnet assembly form the predetermined distance.

4. The spur gear liquid flow detection device of claim 1, wherein, The outer wall of the protective shell is attached to the detection cavity, the inductor is electrically connected to the chip, and the detection assembly applies a Hall detection principle.

5. The spur gear liquid flow detection device of claim 1, wherein, The gear member is formed as a spur gear, two sides of the meshing part of the gear member are respectively formed with a liquid inlet and a liquid outlet, and rotation of the gear assembly causes liquid to be extruded from the liquid inlet to the liquid outlet.

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