Elliptical gear flowmeter with multiple magnetic steels and distribution design method of multiple magnetic steels

Abstract

This invention provides an elliptical gear flow meter with multiple magnets and a method for distributing these magnets, relating to the field of flow meter technology. The elliptical gear flow meter with multiple magnets has at least three magnets. The position of the magnets on a preset circle is calculated based on the change in the area of ​​the discharge chamber between every two pulse signals. The magnets are then embedded in the elliptical gear, allowing the elliptical gear flow meter to generate at least three pulse signals per revolution of the elliptical gear, thereby improving the flow meter's sensitivity.

Description

Technical Field

[0001] This invention relates to the field of flow meter technology, and in particular to an elliptical gear flow meter with multiple magnets and a method for distributing the multiple magnets. Background Technology

[0002] An elliptical gear flow meter consists of a pair of elliptical gears housed within a cavity. It measures flow rate by the liquid being expelled from the space between the gear teeth as they rotate, and by the number of rotations. It is currently a widely used type of volumetric flow meter. The sensitivity of an elliptical gear flow meter depends on the number of pulse signals generated per revolution of the elliptical gears.

[0003] In related technologies, two magnets are embedded on the long axis of one of the elliptical gears, and a magnetic sensor is used to sense pulse signals. The maximum number of pulse signals sensed per revolution of the elliptical gear is two.

[0004] However, currently only two magnets can be embedded in the elliptical gear, which results in poor sensitivity of the elliptical gear flow meter. Summary of the Invention

[0005] This invention provides an elliptical gear flow meter with multiple magnets and a method for distributing the multiple magnets, in order to solve the problem that the current method can only embed two magnets in each elliptical gear, which results in poor sensitivity of the elliptical gear flow meter.

[0006] On one hand, the present invention provides an elliptical gear flow meter with multiple magnets, including a body, two elliptical gears, a gear shaft, magnets, a magnetic sensor, a bushing, and a lower cover plate;

[0007] The two elliptical gears are located within the space enclosed by the body and the lower cover plate. The lower cover plate is provided with two gear shafts, each gear shaft is wrapped with a bushing, and the two elliptical gears are respectively mounted on the two gear shafts.

[0008] One of the two elliptical gears is configured with X magnets and a magnetic sensor, where X ≥ 3. The X magnets are embedded in the elliptical gear, and the magnetic sensor corresponding to the elliptical gear is disposed on the body and located directly above the circle containing the X magnets corresponding to the elliptical gear.

[0009] On the other hand, the present invention provides a method for designing the distribution of multiple magnets, comprising:

[0010] Calculate the drainage chamber area S of the elliptical gear flow meter;

[0011] Select a preset circle with the center O of one of the two elliptical gears;

[0012] The elliptical gear is equipped with X magnets and a magnetic sensor. The elliptical gear flow meter can generate X pulse signals for each rotation of the elliptical gear, where X ≥ 3.

[0013] Based on the change in the area of ​​the drainage chamber between every two pulse signals, calculate the positions of X magnets on the preset circle, and embed the X magnets into the elliptical gear.

[0014] Optionally, the step of calculating the positions of X magnets on a preset circle based on the change in the area of ​​the drainage chamber between every two pulse signals, and embedding the X magnets into the elliptical gear, includes:

[0015] One of the X magnets is embedded at an arbitrary position on a preset circle; the change in the area of ​​the drainage chamber between every two pulse signals is S1. Calculate the positions of X-1 magnets on the preset circle, and embed X-1 magnets into the elliptical gear.

[0016] Optionally, X points are set on the preset circle, and the X points include P1 and P2. n The X magnets include a first magnet and an nth magnet, the first magnet being located at position P1, and the nth magnet being located at position P... n Position, where 2≤n≤X;

[0017] Starting from position P1, the elliptical gear of the elliptical gear flow meter rotates, and the nth magnet triggers the magnetic sensor to generate a pulse signal, causing the change in the area of ​​the drainage chamber to be... The position of the nth magnet is determined based on the rotation angle of the elliptical gear.

[0018] Optionally, when At that time, according to the formula:

[0019] Calculate OP n The angle between OP1 and OP1 is

[0020] when At that time, OP n The angle between OP1 and OP1 is

[0021] when At that time, according to the formula:

[0022] Calculate OP n The angle between OP1 and OP1 is

[0023] when At that time, OP n The angle between OP1 and OP1 is π;

[0024] when At that time, according to the formula:

[0025] Calculate OP n The angle between OP1 and OP1 is

[0026] when At that time, OP n The angle between OP1 and OP1 is

[0027] when At that time, according to the formula:

[0028] Calculate OP n The angle between OP1 and OP1 is

[0029] Where R is the sealing circle radius of the elliptical gear body, e is the eccentricity of the elliptical gear, and A is 1 / 2 of the center distance between the elliptical gear and the circular gear of the elliptical gear flow meter.

[0030] Optionally, according to the formula Calculate the area S of the drainage chamber.

[0031] Optionally, when R = 49.3 mm, A = 37.4194 mm, e = 0.3, and X = 8, the angle between OP2 and OP1 is 36.271°, the angle between OP3 and OP1 is 90°, the angle between OP4 and OP1 is 143.729°, the angle between OP5 and OP1 is 180°, the angle between OP6 and OP1 is 216.271°, the angle between OP7 and OP1 is 270°, and the angle between OP8 and OP1 is 306.271°.

[0032] Optionally, when R = 49.3 mm, A = 37.4194 mm, e = 0.3, and X = 5, the angle between OP2 and OP1 is 67.874°, the angle between OP3 and OP1 is 152.755°, the angle between OP4 and OP1 is 207.245°, and the angle between OP5 and OP1 is 337.874°.

[0033] Optionally, when R = 49.3 mm, A = 37.4194 mm, e = 0.3, and X = 6, the angle between OP2 and OP1 is 53.33°, the angle between OP3 and OP1 is 126.67°, the angle between OP4 and OP1 is 180°, the angle between OP5 and OP1 is 233.64°, and the angle between OP6 and OP1 is 323.33°.

[0034] Optionally, the center of the other elliptical gear is O1, the magnetic sensor is located directly above the preset circle, the projection of the magnetic sensor on the preset circle is C1, and the angle between the line connecting OO1 and OC1 is equal to the angle between the line connecting OP1 and the major axis of the elliptical gear with center O.

[0035] This invention provides an elliptical gear flow meter with multiple magnets and a method for distributing the multiple magnets. At least three magnets are set, and the position of the magnets on a preset circle is calculated based on the change in the area of ​​the drainage chamber between every two pulse signals. The magnets are then embedded in the elliptical gear, so that the elliptical gear flow meter can generate at least three pulse signals per revolution of the elliptical gear, thereby improving the sensitivity of the elliptical gear flow meter. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the 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 based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of an elliptical gear flow meter with multiple magnets provided in an embodiment of the present invention;

[0038] Figure 2 for Figure 1 A schematic diagram of the preset circle in the diagram;

[0039] Figure 3 for Figure 1 Schematic diagram of the CC section in the image;

[0040] Figure 4 for Figure 3 Schematic diagram of the EE cross section in the diagram;

[0041] Figure 5 for Figure 1 A schematic diagram of the elliptical gear flow meter after the elliptical gear has rotated.

[0042] Figure 6A block diagram illustrating a method for designing the distribution of multiple magnets according to an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of another elliptical gear flow meter with multiple magnets provided in an embodiment of the present invention;

[0044] Figure 8 for Figure 7 A schematic diagram of the preset circle in the diagram;

[0045] Figure 9 A schematic diagram of another elliptical gear flow meter with multiple magnets provided in an embodiment of the present invention;

[0046] Figure 10 for Figure 9 A schematic diagram of the preset circle in the diagram.

[0047] Explanation of reference numerals in the attached figures:

[0048] 10-Elliptical Gear;

[0049] 20-Magnetic steel;

[0050] 30-Magnetic sensor;

[0051] 40-Ontology;

[0052] 50-Gear Shaft;

[0053] 60-shaft sleeve;

[0054] 70 - Lower cover plate. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] In related technologies, only two magnets are embedded on the long axis of one of the elliptical gears, and a magnetic sensor is used to sense pulse signals. The maximum number of pulse signals sensed per revolution of the elliptical gear is two. However, currently, only two magnets can be embedded in the elliptical gear, and the two magnets are located on the long axis of the elliptical gear. The elliptical gear flow meter can only generate a maximum of two pulse signals per revolution of the elliptical gear, which results in poor sensitivity of the elliptical gear flow meter.

[0061] To address the aforementioned problems, this invention provides an elliptical gear flow meter with multiple magnets and a method for distributing these magnets. The method involves setting at least three magnets, calculating the position of each magnet on a preset circle based on the change in the drainage chamber area between every two pulse signals, and embedding the magnets into the elliptical gear. This allows the elliptical gear flow meter to generate at least three pulse signals per revolution of the elliptical gear, thereby improving the flow meter's sensitivity.

[0062] The following detailed description, in conjunction with specific embodiments, illustrates the oval gear flow meter with multiple magnets and the distribution design method of the multiple magnets provided in this invention.

[0063] Figure 1 This is a schematic diagram of the structure of an elliptical gear flow meter with multiple magnets provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the preset circle in the diagram; Figure 3 for Figure 1 Schematic diagram of the CC section in the image; Figure 4 for Figure 3 Schematic diagram of the EE cross section in the diagram;

[0064] like Figure 1 , Figure 3 and Figure 4 As shown, this embodiment of the invention provides an elliptical gear flow meter with multiple magnets, including two elliptical gears 10, magnets 20, a magnetic sensor 30, a body 40, gear shafts 50, bushings 60, and a lower cover plate 70. The two elliptical gears 10 are located within the space enclosed by the body 40 and the lower cover plate 70. Two gear shafts 50 are mounted on the lower cover plate 70, and each gear shaft 50 is wrapped with a bushing 60. The two elliptical gears 10 are respectively mounted on the two gear shafts 50.

[0065] Among them, one of the two elliptical gears 10 is equipped with X magnets 20 and a magnetic sensor 30, where X ≥ 3.

[0066] X magnets 20 are embedded in the elliptical gear 10 using a multi-magnet distribution design. The magnetic sensor 30 corresponding to the elliptical gear 10 is set on the body 40 and is located directly above the circle containing the X magnets 20 corresponding to the elliptical gear 10.

[0067] By setting at least three magnets 20 and embedding them into the elliptical gear 10, the elliptical gear flow meter can generate at least three pulse signals per revolution of the elliptical gear 10, thereby improving the sensitivity of the elliptical gear flow meter.

[0068] Figure 6 This is a block diagram illustrating a method for the distribution design of multiple magnets according to an embodiment of the present invention.

[0069] like Figure 6 As shown, an embodiment of the present invention provides a method for the distributed design of multiple magnets, including:

[0070] S100: Calculate the drainage chamber area S of the elliptical gear flow meter.

[0071] The elliptical gear flow meter includes two elliptical gears 10, which mesh with each other.

[0072] like Figure 1 and 3 As shown, the elliptical gear 10 includes the sealing circle radius R of the elliptical gear body and the width B of the elliptical gear.

[0073] The drainage chamber area S can be defined as the ratio of the drainage volume V of the elliptical gear flow meter to the width B of the elliptical gear per revolution of the elliptical gear 10. The drainage volume V can be calculated using the formula... get.

[0074] Therefore, the formula for calculating the area S of the drainage chamber is as follows:

[0075]

[0076] A is 1 / 2 of the center distance between the elliptical gears and the circular gears of the elliptical gear flow meter. e is the eccentricity of the elliptical gear 10.

[0077] S200: Select the preset circle D with the center O of the elliptical gear 10.

[0078] Specifically, the elliptical gear 10 is used to embed the magnet 20 on the circumference of a preset circle D. The diameter of the preset circle D can be set as needed.

[0079] S300: The elliptical gear 10 is equipped with X magnets 20 and a magnetic sensor 30. The elliptical gear 10 of the elliptical gear flow meter can generate X pulse signals per revolution, and the change in the area of ​​the discharge chamber between two pulse signals is S1, where X≥3.

[0080] X magnets 20 are embedded in the circumference of a preset circle D. The magnetic sensor 30 is located directly above the preset circle D.

[0081] The elliptical gear flow meter generates X pulse signals per revolution of the elliptical gear 10. The volume of liquid discharged by the flow meter is equal between every two pulse signals. The change in the discharge chamber area between every two pulse signals is S1, which can be defined as the ratio of the volume of liquid discharged by the flow meter between two pulse signals to the width B of the elliptical gear. This can be calculated using a formula.

[0082] S400: Calculate the position of X magnets 20 on the preset circle D based on the change in the area of ​​the drainage chamber between every two pulse signals, and embed the X magnets 20 into the elliptical gear 10.

[0083] First, one of the X magnets 20 is embedded at an arbitrary position on a preset circle D. Specifically, one of the X magnets 20 is designated as the first magnet, and its position on the preset circle D is arbitrary. Then, based on the change in the drainage chamber area between every two pulse signals, S1, the positions of X-1 magnets 20 on the preset circle D are calculated, and these X-1 magnets 20 are embedded in the elliptical gear 10.

[0084] X-1 magnets include the nth magnet, where 2≤n≤X.

[0085] In one optional embodiment, the elliptical gear 10 is equipped with five magnets 20, with the first magnet located at any position within a preset circle D. Starting from the position of the first magnet, the remaining four magnets 20 are sequentially arranged as the second, third, fourth, and fifth magnets along the circumference of the preset circle D. Starting from the position of the first magnet, when the elliptical gear 10 of the elliptical gear flowmeter rotates, the second magnet triggers the magnetic sensor 30 to generate a pulse signal, causing a change in the drainage chamber area of ​​S1. Based on the rotation angle of the elliptical gear 10, the position of the second magnet is determined. Similarly, starting from the position of the first magnet, when the elliptical gear 10 of the elliptical gear flowmeter rotates, the third magnet triggers the magnetic sensor 30 to generate a pulse signal, causing a change in the drainage chamber area of ​​twice S1. Based on the rotation angle of the elliptical gear 10, the position of the third magnet is determined. Starting from the position of the first magnet, when the elliptical gear 10 of the elliptical gear flow meter rotates, the fourth magnet triggers the magnetic sensor 30 to generate a pulse signal, causing the change in the drainage chamber area to be three times S1. Based on the rotation angle of the elliptical gear 10, the position of the fourth magnet 20 is determined. Starting from the position of the first magnet, when the elliptical gear 10 of the elliptical gear flow meter rotates, the fifth magnet triggers the magnetic sensor 30 to generate a pulse signal, causing the change in the drainage chamber area to be four times S1. Based on the rotation angle of the elliptical gear 10, the position of the fifth magnet is determined.

[0086] It should be noted that when the elliptical gear 10 rotates at an angle of... When, the change in the area of ​​the drainage chamber is in, According to the formula:

[0087] Calculated.

[0088] It should also be noted that the multi-magnet distribution design method provided in the embodiments of the present invention is also applicable to two magnets 20.

[0089] By setting at least three magnets 20, and then calculating the position of the magnets 20 on the preset circle D based on the change in the area of ​​the drainage chamber between every two pulse signals, and embedding the magnets 20 into the elliptical gear 10, the elliptical gear flow meter can generate at least three pulse signals per revolution of the elliptical gear 10, thereby improving the sensitivity of the elliptical gear flow meter.

[0090] Optionally, such as Figure 1 and Figure 2 As shown, X points are set on the preset circle D, including P1 and P2. n , where 2≤n≤X.

[0091] Among them, the first magnet is located at position P1, and the nth magnet is located at position P. n Location.

[0092] The angle between OP1 and the major axis of the elliptical gear 10 can be less than 90°. The major axis of the elliptical gear 10 can extend along the first direction Y.

[0093] Furthermore, starting from position P1, when the elliptical gear 10 of the elliptical gear flow meter rotates, the nth magnet triggers the magnetic sensor 30 to generate a pulse signal, so that the change in the area of ​​the discharge chamber is n-1 times S1, the position of the nth magnet is determined according to the rotation angle of the elliptical gear 10.

[0094] Wherein, n-1 times S1 is

[0095] when At that time, according to the formula:

[0096] Calculate OP n The angle between OP1 and OP1 is It should be noted that, The angle of rotation of the elliptical gear 10 is defined as follows: when the elliptical gear 10 of the elliptical gear flow meter rotates starting from position P1, and the nth magnet triggers the magnetic sensor 30 to generate a pulse signal.

[0097] when At that time, OP n The angle between OP1 and OP1 is

[0098] when At that time, according to the formula:

[0099] Calculate OP nThe angle between OP1 and OP1 is

[0100] when At that time, OP n The angle between OP1 and OP1 is π.

[0101] when At that time, according to the formula:

[0102] Calculate OP n The angle between OP1 and OP1 is

[0103] when At that time, OP n The angle between OP1 and OP1 is

[0104] when At that time, according to the formula:

[0105] Calculate OP n The angle between OP1 and OP1 is

[0106] Figure 7 A schematic diagram of another elliptical gear flow meter with multiple magnets provided in an embodiment of the present invention; Figure 8 for Figure 7 A schematic diagram of the preset circle in the diagram; Figure 9 A schematic diagram of another elliptical gear flow meter with multiple magnets provided in an embodiment of the present invention; Figure 10 for Figure 9 A schematic diagram of the preset circle in the diagram.

[0107] In the first alternative implementation, such as Figure 1 and 2 As shown, when R = 49.3 mm, A = 37.4194, e = 0.3, and X = 8, the angle between OP2 and OP1 is 36.271°, the angle between OP3 and OP1 is 90°, the angle between OP4 and OP1 is 143.79°, the angle between OP5 and OP1 is 180°, the angle between OP6 and OP1 is 216.271°, the angle between OP7 and OP1 is 270°, and the angle between OP8 and OP1 is 306.271°.

[0108] In the second alternative implementation, such as Figure 7 and 8As shown, when R = 49.3 mm, A = 37.4194, e = 0.3, and X = 5, the angle between OP2 and OP1 is 67.874°, the angle between OP3 and OP1 is 152.755°, the angle between OP4 and OP1 is 207.245°, and the angle between OP5 and OP1 is 337.874°.

[0109] In a third alternative implementation, such as Figure 9 and 10 As shown, when R = 49.3 mm, A = 37.4194, e = 0.3, and X = 6, the angle between OP2 and OP1 is 53.33°, the angle between OP3 and OP1 is 126.67°, the angle between OP4 and OP1 is 180°, the angle between OP5 and OP1 is 233.63°, and the angle between OP6 and OP1 is 323.33°.

[0110] Figure 5 for Figure 1 The diagram shows the elliptical gear of the flow meter after the elliptical gear has rotated.

[0111] Optionally, such as Figure 5 As shown, the center of the other elliptical gear 10 is O1. The magnetic sensor 30 is located directly above the preset circle D. The projection of the magnetic sensor 30 onto the preset circle D is C1. The angle between the line connecting OO1 and OC1 is equal to the angle between the line connecting OP1 and the major axis of the elliptical gear 10 with center O. This configuration ensures that when the elliptical gear 10 of the elliptical gear flow meter generates X pulse signals per revolution, the change in the area of ​​the discharge chamber between every two pulse signals is equal.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of designing a distribution of multiple magnetic steels, characterized by, include: Calculate the drainage chamber area S of the elliptical gear flow meter; Select a preset circle with the center O of one of the two elliptical gears; The elliptical gear is equipped with X magnets and a magnetic sensor. The elliptical gear flow meter can generate X pulse signals for each rotation of the elliptical gear, where X ≥ 3. Based on the change in the area of ​​the drainage chamber between every two pulse signals, calculate the positions of X magnets on the preset circle, and embed the X magnets into the elliptical gear; The step of calculating the positions of X magnets on a preset circle based on the change in the area of ​​the drainage chamber between every two pulse signals, and embedding the X magnets into the elliptical gear, includes: Embedding one of the X magnetic steels in a preset circle at an arbitrary position; the change amount of the drainage cavity area between every two pulse signals is S1, , calculating the positions of X-1 magnetic steels on the preset circle and embedding the X-1 magnetic steels in the elliptical gear; The preset circle is provided with X points, the X points include P1 and P n The X magnetic steels include a first magnetic steel and an n-th magnetic steel, the first magnetic steel is located at the P1 position, and the n-th magnetic steel is located at the P n position, wherein 2≤n≤X. With the P1 position as a starting point, the oval gear of the oval gear flowmeter rotates, the nth magnetic steel triggers the magnetic sensor to generate a pulse signal, so that the change amount of the discharge cavity area is , according to the angle of the oval gear rotation, the position of the nth magnetic steel is determined; When the formula: , the angle between OP1 and OP2 is calculated as n ;​ When the angle between OP n and OP1 is ; When the formula: , the angle between OP1 and OP2 is calculated n ;​ When OP n is at an angle of to OP1. When the formula: , the angle between OP1 and OP2 is calculated n ;​ When OP n is at an angle of ; When the formula: , the angle between OP1 and OP2 is calculated n ;​ Where R is the sealing circle radius of the elliptical gear body, e is the eccentricity of the elliptical gear, and A is 1 / 2 of the center distance between the two elliptical gears of the elliptical gear flow meter.

2. The multi-magnet distribution design method according to claim 1, characterized in that, The drain cavity area S is calculated according to the formula S = 2πr2 3. The multi-magnet distribution design method according to claim 2, characterized in that, when mm mm , At that time, the angle between OP2 and OP1 is The angle between OP3 and OP1 is °, the angle between OP4 and OP1 is The angle between OP5 and OP1 is The angle between OP6 and OP1 is The angle between OP7 and OP1 is The angle between OP8 and OP1 is .

4. The multi-magnet distribution design method according to claim 2, characterized in that, when mm mm , At that time, the angle between OP2 and OP1 is The angle between OP3 and OP1 is The angle between OP4 and OP1 The angle between OP5 and OP1 is .

5. The method for designing the distribution of multiple magnets according to claim 2, characterized in that, when mm mm , At that time, the angle between OP2 and OP1 is The angle between OP3 and OP1 is The angle between OP4 and OP1 is The angle between OP5 and OP1 is The angle between OP6 and OP1 is .

6. The method for designing the distribution of multiple magnets according to any one of claims 1-5, characterized in that, The center of the other elliptical gear among the two elliptical gears is O1. The magnetic sensor is located directly above the preset circle. The projection of the magnetic sensor on the preset circle is C1. The angle between the line connecting OO1 and OC1 is equal to the angle between the line connecting OP1 and the major axis of the elliptical gear with center O.

7. The method for designing the distribution of multiple magnets according to any one of claims 1-5, characterized in that, The elliptical gear flow meter includes a body, two elliptical gears, a gear shaft, a magnet, a magnetic sensor, a bushing, and a lower cover plate. The two elliptical gears are located within the space enclosed by the body and the lower cover plate. The lower cover plate is provided with two gear shafts, each gear shaft is wrapped with a bushing, and the two elliptical gears are respectively mounted on the two gear shafts. One of the two elliptical gears is configured with X magnets and a magnetic sensor, where X ≥ 3. The X magnets are embedded in the elliptical gear, and the magnetic sensor corresponding to the elliptical gear is disposed on the body and located directly above the preset circle containing the X magnets corresponding to the elliptical gear.

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