High-pressure-resistant bidirectional elliptical gear micro flow meter

Abstract

The invention discloses a high-pressure-resistant bidirectional elliptical gear micro flowmeter, and belongs to the technical field of micro flowmeters.The flowmeter comprises a flow shell, a cavity is formed in the flow shell, a first elliptical gear and a second elliptical gear are rotationally connected into the cavity, and an output shaft is arranged at the circle center of the second elliptical gear; a rotating shaft is arranged on the first elliptical gear, a magnetic coupling assembly is assembled at the end of the output shaft, and the output end of the magnetic coupling assembly is connected with a flow meter. The non-contact magnetic attraction transmission structure of the outer magnetic rotor and the inner magnetic rotor is adopted, and compared with a traditional mechanical shaft seal transmission mode, kinetic energy loss caused by shaft seal friction is thoroughly eliminated, and meanwhile the fluid leakage risk is avoided; through the matching design of the semi-cylindrical rubber strips and the caulking grooves, the radial deviation of the rotor is limited in the magnetic attraction transmission process, so that the metering error under the micro flow is reduced, the high-precision metering of the micro flow under the high-pressure working condition is realized, and the rigid friction during the rotation of the rotor is avoided through the non-contact design of the rubber strips and the caulking grooves.

Description

Technical Field

[0001] This invention belongs to the field of micro-flow meter technology, specifically relating to a high-pressure resistant bidirectional oval gear micro-flow meter. Background Technology

[0002] Existing elliptical gear flow meters use two magnets embedded on both sides of the top of the gear on the main body to form the component. A signal receiver (sensor) corresponding to the magnet is placed on the top cover. Since the signal receiver cannot withstand temperatures above 100°C, this flow meter cannot be used in scenarios with temperatures above 100°C.

[0003] Chinese invention patent CN119642917A discloses an elliptical gear flow meter that places a fiber optic sensor inside a safety cover, keeping the sensor away from the liquid flow and preventing direct contact with the liquid. This improves the flow meter's heat resistance and extends its service life, making it suitable for various high-temperature scenarios. Furthermore, the magnetic force between the upper and lower magnets drives the rotation of the toothed flaps. The fiber optic sensor can detect and count the flow rate through its fiber optic probe. The distance between the upper and lower magnets ensures that heat does not accumulate and allows for rapid heat dissipation. By rotating two control arms, one end of each arm drives a corresponding rack to slide, which in turn moves a stabilizing ring. This stabilizing ring then compresses and limits the expansion section of the corresponding rubber sleeve, improving the stability of the pipe connection.

[0004] While the aforementioned technologies address the inconvenience of high-temperature use to some extent, they exhibit significant technical drawbacks under high-pressure conditions: traditional mechanical shaft seal transmissions are prone to frictional losses and leaks, leading to large measurement errors for minute flow rates; the single-plane sealing structure of the housing has poor pressure resistance (≤10MPa), and the layout of the inlet and outlet ports exacerbates turbulence losses; the magnetic rotor of the magnetic coupling transmission flowmeter lacks effective limiting support, resulting in poor stability, difficulty in disassembly and maintenance, and easy wear and tear on exposed magnetic components; the integrated assembly structure makes maintenance of components such as seals cumbersome, costly, and time-consuming, making it difficult to meet the high-precision and high-reliability measurement requirements for high-pressure minute flow rates. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] To address the problems mentioned in the background section, the present invention adopts the following technical solution.

[0007] A high-pressure resistant bidirectional elliptical gear micro flow meter includes a flow housing with a cavity inside. A first elliptical gear and a second elliptical gear are rotatably connected inside the cavity. An output shaft is located at the center of the second elliptical gear. A rotating shaft is located on the first elliptical gear. A magnetic coupling assembly is mounted at the end of the output shaft, and the output end of the magnetic coupling assembly is connected to a flow meter. When fluid passes through the flow housing, it drives the second elliptical gear to rotate. When the second elliptical gear rotates, it transmits the rotational force to the magnetic coupling assembly. The magnetic attraction of the magnetic coupling assembly reduces kinetic energy loss, making the flow meter reading more accurate. The magnetic coupling assembly includes an outer magnetic rotor and an inner magnetic rotor. The inner magnetic rotor is sleeved inside the outer magnetic rotor, and the inner and outer magnetic rotors do not contact each other. A groove is formed on the inner wall of the outer magnetic rotor, and a rubber strip is provided on the outer wall of the inner magnetic rotor to fit the groove.

[0008] Preferably, the inner wall of the outer magnetic rotor is circumferentially arranged with multiple outer magnetic components, and a cover is fitted on the outer magnetic rotor. The cover and the outer magnetic rotor are connected by bolts to hide the outer magnetic components, and the groove is opened on the inner wall of the cover.

[0009] Preferably, the end of the external magnetic rotor is bolted to a bottom sleeve, and a retaining sleeve is integrally connected to the center of the rear surface of the bottom sleeve. The end of the output shaft is fixedly connected to the retaining sleeve, and a rectangular hole is provided on the retaining sleeve. A key matching the rectangular hole is provided on the end of the output shaft.

[0010] Preferably, both the rubber strip and the groove are semi-cylindrical structures. When the outer magnetic rotor and the inner magnetic rotor are assembled, the rubber strip and the groove correspond one-to-one but are not connected.

[0011] Preferably, the inner magnetic rotor is provided with an inner magnetic force element, which is a ring structure, and a connecting sleeve is sleeved inside the inner magnetic force element. The connecting sleeve and the inner magnetic rotor are fixedly connected by screws, and a connecting plate is connected to the end of the connecting sleeve by bolts.

[0012] Preferably, the connecting plate has a circular hole at the center of each hole, and a bushing is integrally formed on the inner surface of the circular hole. The connecting plate is fixedly connected to the drive shaft through the bushing and connected to the input end of the flow meter. A bearing sleeve is fixedly provided on the drive shaft, and a bracket is fixedly connected to the outside of the bearing sleeve. The inner magnetic rotor is supported by the bracket, and the bottom of the drive shaft is connected to the output shaft.

[0013] Preferably, the flow housing has symmetrically opened circular holes on its side. The extended line of the center of the circular hole is perpendicular to the meshing point of the first elliptical gear and the second elliptical gear. A connecting pipe is connected to the outer surface of the circular hole, one of which serves as the liquid inlet and the other as the liquid outlet.

[0014] Preferably, a circular groove is provided on the lower surface of the flow housing, the diameter of the circular groove is larger than the opening diameter of the cavity, and a second sealing plate is provided in the circular groove. A screw hole is provided between the second sealing plate and the lower surface of the circular groove. The second sealing plate is fixed to the circular groove by screws, and a sealing ring is embedded in the circular groove. A lower end cover is connected to the lower surface of the flow housing by bolts.

[0015] Preferably, the upper end of the flow housing and the inner wall of the cavity are provided with a liner, the lower surface of the liner is close to the surface of the first elliptical gear and the second elliptical gear, and the upper surface of the liner has a certain height difference with the upper surface of the flow housing. The upper surface of the liner is provided with a first sealing sheet, and the upper surface of the flow housing is also provided with an upper end cover. The lower surface of the upper end cover is provided with a pressure plate to press the first sealing sheet tightly.

[0016] Preferably, both the first sealing plate and the second sealing plate have holes for the rotating shaft and the output shaft to pass through, and the two ends of the rotating shaft are sealed with shaft caps after passing through the first sealing plate and the second sealing plate. The lower end of the output shaft is sealed with a shaft cap after passing through the second sealing plate, and the upper end of the output shaft is connected to the bottom of the external magnetic rotor after passing through the first sealing plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention adopts a non-contact external magnetic rotor and internal magnetic rotor magnetic attraction transmission structure. Compared with the traditional mechanical shaft seal transmission method, it completely eliminates the kinetic energy loss caused by shaft seal friction and avoids the risk of fluid leakage. With the matching design of semi-cylindrical rubber strip and groove, the radial displacement of the rotor is limited during the magnetic attraction transmission process, further reducing the transmission deviation and reducing the metering error under small flow rate. It realizes high-precision metering of small flow rate under high pressure conditions. Furthermore, the semi-cylindrical non-contact matching design of rubber strip and groove avoids rigid friction when the rotor rotates and can buffer the rotor micro displacement caused by high pressure fluid impact, extending the service life of magnetic coupling component. The sealing ring is embedded in the circular groove. Compared with the traditional planar seal, the pressure distribution of the sealing surface is more uniform, reducing the probability of leakage under high pressure.

[0018] (2) In this invention, the upper and lower ends of the flow housing are respectively provided with a double-layer sealing structure of liner-first sealing sheet and circular groove-second sealing sheet. The drop design of the liner makes the sealing sheet more uniformly stressed. Combined with the shaft cap to seal the end of the rotating shaft / output shaft, it can withstand a large megapascal fluid pressure. At the same time, the layout of the extension line of the circular hole at the input end / output end perpendicular to the gear meshing point reduces the turbulent loss of fluid impacting the gear meshing surface, which is suitable for high pressure and small flow rate transportation scenarios. The lower end cover and upper end cover of the flow housing are both connected by bolts. The first / second sealing sheet is independently fixed by pressure plate and screw, and the sealing component can be replaced without disassembling the flow meter as a whole. The outer magnetic rotor sleeve, bottom sleeve and inner magnetic rotor connecting sleeve of the magnetic coupling component are all bolted connection structures, which facilitates the inspection and replacement of magnetic components.

[0019] (2) In this invention, the outer magnetic rotor is designed to hide the outer magnetic component through a cover, and the bottom sleeve-clamp sleeve is connected to the output shaft pin key. This enables the magnetic coupling component and the output shaft to be quickly disassembled and assembled. The pin key + rectangular hole connection method avoids transmission slippage. The inner magnetic rotor supports the transmission shaft through a bracket-bearing sleeve. Compared with the unsupported magnetic rotor structure, the radial runout is controlled precisely, improving the transmission stability during long-term operation and adapting to the continuous metering requirements of industrial sites. Attached Figure Description

[0020] Figure 1 This is an external view of the miniature flow meter of the present invention.

[0021] Figure 2 This is an exploded view of the micro flow meter of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the micro flow meter of the present invention.

[0023] Figure 4 Cross-section of the miniature flow meter of the present invention Figure 1 .

[0024] Figure 5 A cross-sectional view of the miniature flow meter of the present invention. Figure 2 .

[0025] Figure 6 This is an assembly diagram of the flow meter and its magnetic coupling component of the present invention.

[0026] Figure 7 This is a split diagram of the flow meter and its magnetic coupling component of the present invention.

[0027] Figure 8 This is a cross-sectional plan view of the magnetic coupling component of the present invention.

[0028] Figure 9 The magnetic coupling component of the present invention exploded. Figure 1 .

[0029] Figure 10 The magnetic coupling component of the present invention exploded. Figure 2 .

[0030] The correspondence between the labels and component names in the attached figures is as follows: 100. Flow meter housing; 100a. Cavity; 100b. Liner; 100c. Connecting pipe; 101. First elliptical gear; 102. Second elliptical gear; 102a. Output shaft; 103. First sealing plate; 104. Upper end cover; 104a. Pressure plate; 105. Second sealing plate; 106. Lower end cover; 200. Magnetic coupling assembly; 201. Outer magnetic rotor; 201a. Outer magnetic component; 201b. Enclosure; 201c. Groove; 201d. Bottom sleeve; 202. Inner magnetic rotor; 202a. Rubber strip; 202b. Inner magnetic component; 202c. Connecting sleeve; 202d. Connecting disc; 202e. Shaft sleeve; 202f. Drive shaft; 202g. Bearing sleeve; 203. Bracket; 204. Flow meter. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The present invention provides the following embodiments.

[0034] See Figure 1 and Figure 2This is a structural diagram of a high-pressure resistant bidirectional elliptical gear micro flow meter device according to this embodiment. The flow meter includes a flow housing 100, which is integrally cast from a high-strength alloy material. Inside the flow housing 100 is a cavity 100a adapted to mesh and rotate with a first elliptical gear 101 and a second elliptical gear 102. The inner wall of the cavity 100a is precision polished to reduce resistance loss during fluid flow. The first elliptical gear 101 and the second elliptical gear 102 are rotatably connected within the cavity 100a via bearings. The tooth profiles of the first elliptical gear 101 and the second elliptical gear 102 are designed with involute curves, and the meshing clearance is controlled within a very small range to ensure the accuracy of fluid measurement. An output shaft 102a is coaxially fixed to the center of the second elliptical gear 102, while a rotating shaft is fixed to the center of the first elliptical gear 101. Both the output shaft 102a and the rotating shaft are designed with involute curves. Made of wear-resistant stainless steel, it has excellent corrosion resistance and fatigue resistance. The core improvement of this flow meter is that the end of the output shaft 102a is equipped with a magnetic coupling component 200. The output end of the magnetic coupling component 200 is connected to the input end of the flow meter 204 through a coupling. When the high-pressure fluid flows through the cavity 100a inside the flow housing 100, the pressure difference of the fluid drives the first elliptical gear 101 and the second elliptical gear 102 to mesh and rotate. When the second elliptical gear 102 rotates, it transmits the rotational torque to the magnetic coupling component 200 through the output shaft 102a. By using the non-contact magnetic attraction transmission method of the magnetic coupling component 200, the frictional resistance caused by the traditional mechanical shaft seal transmission is completely eliminated, the kinetic energy loss is greatly reduced, and the risk of fluid leakage through the shaft seal gap is avoided, so that the reading of the flow meter 204 can accurately reflect the actual small flow value.

[0035] See Figure 6 In this embodiment, the magnetic coupling assembly 200 includes an outer magnetic rotor 201 and an inner magnetic rotor 202. The inner magnetic rotor 202 is coaxially sleeved within the inner cavity of the outer magnetic rotor 201, and a uniform air gap is maintained between the outer wall of the inner magnetic rotor 202 and the inner wall of the outer magnetic rotor 201. The two components have no physical contact. (See reference...) Figure 9-10In this embodiment, the inner wall of the outer magnetic rotor 201 is provided with several grooves 201c evenly distributed along the circumferential direction. A rubber strip 202a is integrally formed on the corresponding position of the outer wall of the inner magnetic rotor 202. The rubber strip 202a is made of oil-resistant and high-pressure-resistant fluororubber material, and it fits into the grooves 201c, effectively limiting the radial offset of the inner magnetic rotor 202 relative to the outer magnetic rotor 201, thus improving transmission stability. Multiple external magnetic elements 201a are evenly embedded in the inner wall of the outer magnetic rotor 201 in a circumferential manner. A high-performance permanent magnet is selected, possessing strong magnetic force and stable magnetic properties. A sleeve 201b is coaxially fitted onto the outer magnetic rotor 201. The sleeve 201b is made of non-magnetic metal and is fastened to the outer magnetic rotor 201 by circumferentially distributed bolts, completely concealing the outer magnetic component 201a within the cavity formed by the sleeve 201b and the outer magnetic rotor 201. This prevents the outer magnetic component 201a from directly contacting the fluid medium and causing corrosion and wear. The groove 201c is precisely cut into the corresponding position on the inner wall of the sleeve 201b. (See reference...) Figure 8 and Figure 10 In this embodiment, the end face of the outer magnetic rotor 201 is connected to a base sleeve 201d via flange bolts. A ferrule is integrally formed at the center of the rear surface of the base sleeve 201d. The inner hole of the ferrule is adapted to the end of the output shaft 102a. The end of the output shaft 102a and the ferrule are fixedly connected by an interference fit. A rectangular hole is provided on the inner wall of the ferrule. A pin key that precisely matches the rectangular hole is machined at the corresponding position on the end of the output shaft 102a. The mating structure of the pin key and the rectangular hole can effectively transmit torque and prevent relative slippage between the output shaft 102a and the ferrule, ensuring the reliability of the transmission. Both the rubber strip 202a and the groove 201c are designed as semi-cylindrical structures. After the outer magnetic rotor 201 and the inner magnetic rotor 202 are assembled, the rubber strip 202a and the groove 201c correspond one-to-one and maintain a small gap without contacting each other, which serves as a radial limit and does not cause additional friction loss due to contact.

[0036] See Figure 1 , Figure 6 and Figure 7In this embodiment, an inner magnetic component 202b is embedded inside the inner magnetic rotor 202. The inner magnetic component 202b has a ring structure and is arranged with opposite polarities to the magnetic poles of the outer magnetic component 201a to ensure the effective torque of the magnetic attraction transmission. A connecting sleeve 202c is coaxially sleeved in the inner hole of the inner magnetic component 202b. The connecting sleeve 202c and the inner magnetic rotor 202 are fixedly connected by screws evenly distributed along the circumference. A connecting disc 202d is bolted to the end face of the connecting sleeve 202c. A circular hole is opened at the center of the connecting disc 202d. A bushing 202e is integrally formed on the inner surface of the circular hole. The inner wall of the bushing 202e is hardened. With excellent wear resistance, the connecting disc 202d is coaxially fixed to the drive shaft 202f through the bushing 202e. The other end of the drive shaft 202f is connected to the input end of the flow meter 204. A bearing sleeve 202g is also coaxially fixedly mounted on the drive shaft 202f. A bracket 203 is welded and fixed to the outer wall of the bearing sleeve 202g. The other end of the bracket 203 is firmly connected to the external mounting base. The inner magnetic rotor 202 is stably supported by the bracket 203 to ensure the coaxiality of the inner magnetic rotor 202 during rotation. The bottom of the drive shaft 202f is flexibly connected to the output shaft 102a through a universal joint, which can compensate for minor coaxiality deviations during assembly.

[0037] See Figure 2 and Figure 4In this embodiment, the flow housing 100 has radially symmetrical circular holes on its side. These holes are machined with high precision, and their center extension lines precisely point to the meshing point of the first elliptical gear 101 and the second elliptical gear 102, perpendicular to the meshing surface. This arrangement allows the input fluid to act perpendicularly on the gear meshing surface, minimizing turbulence losses caused by fluid impact. A connecting pipe 100c is connected to the outer surface of the circular holes via a flange structure. A metal spiral wound gasket is installed at the connection between the connecting pipe 100c and the flow housing 100 to improve sealing performance. One connecting pipe 100c serves as a liquid inlet, and the other as a liquid outlet. The diameters of both connecting pipes 100c are adapted to the needs of conveying small flow rates, allowing for bidirectional switching of the inlet and outlet directions to meet the requirements of different industrial scenarios. The flow housing 100 has a circular groove on its lower surface. The diameter of the circular groove is larger than the opening diameter of the cavity 100a, forming a stepped structure. A second sealing plate 105 is laid in the circular groove. The second sealing plate 105 is made of high-pressure resistant polytetrafluoroethylene, which has excellent sealing performance and corrosion resistance. Multiple circumferentially distributed screw holes are opened between the second sealing plate 105 and the lower surface of the circular groove. The second sealing plate 105 is tightly fixed to the circular groove by high-strength screws. An O-ring is embedded in the inner wall of the circular groove to further enhance the sealing effect. The lower surface of the flow housing 100 is evenly connected to a lower end cover 106 by multiple sets of bolts. The lower end cover 106 presses the second sealing plate 105 to ensure the sealing performance of the lower part of the cavity 100a and can withstand the impact of high-pressure fluid.

[0038] See Figure 3 and Figure 5In this embodiment, a liner 100b is integrally formed on the upper end of the flow housing 100 and on the inner wall of the cavity 100a. The lower surface of the liner 100b is close to the tooth tip circular surface of the first elliptical gear 101 and the second elliptical gear 102, which can effectively prevent fluid leakage from the top of the gears and improve the metering accuracy. The upper surface of the liner 100b and the upper surface of the flow housing 100 form a certain height difference, forming a stepped surface. A first sealing sheet 103 is laid on the upper surface of the liner 100b. The material of the first sealing sheet 103 is the same as that of the second sealing sheet 105. An upper end cover 104 is bolted to the upper surface of the flow housing 100. A pressure plate 104a is integrally formed on the lower surface of the upper end cover 104. The pressure plate 104a is precisely adapted to the stepped surface of the liner 100b, which can support the first sealing sheet 100b. 03. Uniform compression is achieved to avoid sealing failure caused by uneven force on the sealing sheet; both the first sealing sheet 103 and the second sealing sheet 105 have through holes for the rotating shaft and the output shaft 102a to pass through. Wear-resistant bushings are installed on the inner walls of the through holes to reduce wear on the sealing sheets when the rotating shaft and the output shaft rotate. Both ends of the rotating shaft are fitted with shaft caps after passing through the first sealing sheet 103 and the second sealing sheet 105. A sealing ring is installed between the shaft cap and the sealing sheet to achieve end sealing. The lower end of the output shaft 102a passes through the second sealing sheet 105 and is also fitted with a shaft cap for sealing. The upper end of the output shaft 102a passes through the first sealing sheet 103 and is firmly connected to the bottom sleeve 201d at the bottom of the outer magnetic rotor 201. The entire sealing structure forms a closed loop, which can effectively prevent high-pressure fluid leakage and meet the requirements of high-pressure working conditions.

[0039] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A high-pressure resistant bidirectional elliptical gear micro flowmeter, comprising a flow housing (100), a cavity (100a) is formed in the flow housing (100), a first elliptical gear (101) and a second elliptical gear (102) are rotatably connected in the cavity (100a), and an output shaft (102a) is arranged at the center of the second elliptical gear (102), and a rotating shaft is arranged on the first elliptical gear (101), characterized in that: The end of the output shaft (102a) is equipped with a magnetic coupling assembly (200), and the output end of the magnetic coupling assembly (200) is connected with a flow meter (204). When fluid passes through the flow casing (100), the second oval gear (102) is driven to rotate, and when the second oval gear (102) rotates, the rotating force is transmitted to the magnetic coupling assembly (200), the magnetic attraction of the magnetic coupling assembly (200) is used to reduce the kinetic energy loss, so that the reading of the flow meter (204) is more accurate. The magnetic coupling assembly (200) comprises an outer magnetic rotor (201) and an inner magnetic rotor (202), the inner magnetic rotor (202) is sleeved in the outer magnetic rotor (201), and the inner magnetic rotor (202) is not in contact with the outer magnetic rotor (201). The inner wall of the outer magnetic rotor (201) is provided with an embedding groove (201c), and the outer wall of the inner magnetic rotor (202) is provided with a rubber strip (202a) matched with the embedding groove (201c). ​ 2. The high-pressure resistant bidirectional oval gear micro flowmeter according to claim 1, characterized in that: The inner cavity wall of the outer magnetic rotor (201) is circumferentially provided with a plurality of outer magnetic force pieces (201a), and the outer magnetic rotor (201) is sleeved with an envelope (201b). The outer magnetic force pieces (201a) are hidden by the bolt connection between the envelope (201b) and the outer magnetic rotor (201).

3. The high pressure resistant bidirectional oval gear micro flowmeter according to claim 2, characterized in that: The end of the outer magnetic rotor (201) is connected with a bottom sleeve (201d) by a bolt, and the rear surface center of the bottom sleeve (201d) is integrally connected with a clamping sleeve. The end of the output shaft (102a) is fixedly connected with the clamping sleeve, and a rectangular hole is formed in the clamping sleeve. A pin key matched with the rectangular hole is arranged on the end of the output shaft (102a).

4. The high pressure resistant bidirectional oval gear micro flowmeter according to claim 2, characterized in that: The rubber strip (202a) and the embedding groove (201c) are both semi-cylindrical structures. When the outer magnetic rotor (201) and the inner magnetic rotor (202) are assembled, the rubber strip (202a) and the embedding groove (201c) correspond to each other and are not in contact.

5. The high pressure resistant bidirectional oval gear micro flowmeter according to claim 1, wherein: The inner magnetic rotor (202) is provided with an inner magnetic force piece (202b), which is an annular structure. A connecting sleeve (202c) is sleeved in the inner magnetic force piece (202b). The connecting sleeve (202c) and the inner magnetic rotor (202) are fixedly connected by a screw. The end of the connecting sleeve (202c) is connected with a connecting disc (202d) by a bolt.

6. The high-pressure resistant bidirectional oval gear micro flowmeter according to claim 5, characterized in that: A circular hole is formed in the center of the connecting disc (202d), and an inner surface of the circular hole is integrally provided with a shaft sleeve (202e). The connecting disc (202d) is fixedly connected with a transmission shaft (202f) through the shaft sleeve (202e) and is connected with an input end of the flow meter (204). The transmission shaft (202f) is fixedly provided with a bearing sleeve (202g), and the bearing sleeve (202g) is fixedly connected with a support (203) outside. The inner magnetic rotor (202) is supported by the support (203), and the bottom of the transmission shaft (202f) is connected with the output shaft (102a).

7. The high pressure resistant bidirectional oval gear micro flowmeter according to claim 1, wherein: The side of the flow shell (100) is symmetrically provided with a circular hole, the center of which is perpendicular to the meshing position of the first elliptical gear (101) and the second elliptical gear (102), and the outer surface of the circular hole is connected with a connecting pipe (100c), one of which is used as a liquid inlet, and the other is used as a liquid outlet.

8. The high-pressure resistant bidirectional oval gear micro flowmeter according to claim 7, characterized in that: The lower surface of the flow shell (100) is provided with a circular groove, the diameter of which is larger than the caliber of the cavity (100a), and the circular groove is provided with a second sealing sheet (105), a screw hole is formed between the second sealing sheet (105) and the lower surface of the circular groove, the second sealing sheet (105) is fixed on the circular groove by a screw, and a sealing ring is embedded in the circular groove, and the lower surface of the flow shell (100) is connected with a lower end cover (106) by bolts.

9. The high-pressure resistant bidirectional oval gear micro flowmeter according to claim 8, characterized in that: The upper end of the flow shell (100) and the inner wall of the cavity (100a) are provided with a lining (100b), the lower surface of the lining (100b) is close to the surface of the first elliptical gear (101) and the second elliptical gear (102), and the upper surface of the lining (100b) is lower than the upper surface of the flow shell (100), and the first sealing sheet (103) is placed on the upper surface of the lining (100b), the upper surface of the flow shell (100) is also provided with an upper end cover (104), and the lower surface of the upper end cover (104) is provided with a pressing sheet (104a) to press the first sealing sheet (103) tightly.

10. The high pressure resistant bidirectional oval gear micro flowmeter according to claim 9, characterized in that: The first sealing sheet (103) and the second sealing sheet (105) are both provided with holes for the rotating shaft and the output shaft (102a) to pass through, and the rotating shaft is provided with a shaft cap at both ends to seal after passing through the first sealing sheet (103) and the second sealing sheet (105), the output shaft (102a) is provided with a shaft cap to seal after passing through the second sealing sheet (105), and the upper end of the output shaft (102a) is connected with the bottom of the outer magnetic rotor (201) after passing through the first sealing sheet (103).

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