Carbon fiber rotor positive displacement flowmeter

Abstract

The application discloses a carbon fiber rotor volumetric flowmeter, which comprises a shell, a central shaft rotatingly arranged in the shell, and an inlet main flow channel and an outlet main flow channel formed in the shell; a support is fixed on the central shaft and has a plurality of supporting arms, each of which is provided with an inlet branch flow channel and an outlet branch flow channel; a first end cover is arranged at one end of the shell and is provided with a cam groove, a plurality of variable-volume metering units are respectively arranged on the supporting arms, and a flow distribution sleeve is fixed at the other end of the shell and is sleeved on the central shaft; the support is arranged on the central shaft, the variable-volume metering units are distributed in the circumferential direction of the support, the cam groove on the first end cover drives the variable-volume metering units to axially stretch and shrink to realize the periodic change of the volume, and the rotation of the flow distribution sleeve and the central shaft is matched to realize intermittent flow distribution, so that the volumetric fluid metering without rigid engagement is realized, and the problems of the traditional flowmeter, such as friction and wear, increased gap and influenced metering precision, are solved.

Description

Technical Field

[0001] This invention relates to the field of fluid measurement technology, and in particular to a carbon fiber rotor volumetric flow meter. Background Technology

[0002] Positive displacement flow meters are a type of instrument with high measurement accuracy in flow measurement systems. They utilize a standard volumetric chamber formed by internal metering elements to measure the volume of fluid passing through a pipeline sequentially. They feature high measurement accuracy, wide measurement range, and minimal impact from fluid viscosity fluctuations, making them irreplaceable in fields such as petrochemicals, fine chemicals, pharmaceuticals, food, and energy metering. Currently, the mainstream positive displacement flow meters are mainly based on meshing rotor structures and scraper structures. Typical examples of meshing rotor structures include elliptical gear flow meters and rotary wheel flow meters. These form a metering chamber by a pair of meshing rotors enclosing the inner wall of the casing. The continuous rotation of the rotors completes the intake and discharge of fluid, thereby achieving flow measurement. However, they still have significant technical drawbacks in practical applications: First, the meshing transmission of the rotors is a rigid contact fit. Under long-term high-speed operation, the meshing surface wears significantly, leading to a continuous increase in the sealing gap of the metering chamber, resulting in increased fluid leakage. The measurement accuracy gradually decreases with the service life, requiring frequent calibration and rotor replacement, resulting in high maintenance costs. Scraper flow meters divide fluid into fixed volume units using sliding scrapers. However, there is sliding friction between the scraper and the housing. After long-term operation, scraper wear will lead to a decrease in the sealing of the volume chamber, making it difficult to achieve accurate volume definition and affecting measurement accuracy. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a carbon fiber rotor volumetric flow meter to solve the problems mentioned in the background section. To achieve the above objective, the present invention employs the following technical solution: This carbon fiber rotor volumetric flow meter includes: case; The central shaft is rotatably disposed inside the housing, and an inlet main channel and an outlet main channel are provided inside it; A bracket is fixed on the central axis. The bracket has multiple support arms distributed circumferentially. Each support arm has an inlet branch channel and an outlet branch channel. The inlet branch channel is connected to the inlet main channel, and the outlet branch channel is connected to the outlet main channel. The bracket is made of carbon fiber material. A first end cap is disposed at one end of the housing. The first end cap has an annular cam groove on the side facing the housing. The depth of the cam groove changes periodically in the circumferential direction. Multiple variable volume metering units are respectively installed on the support arm. Each variable volume metering unit is connected to the inlet branch channel and the outlet branch channel on the corresponding support arm. The axial length of the variable volume metering unit can be changed as the fluid enters or exits. The end of each variable volume metering unit away from the bracket is rolledly connected to the cam groove. A distribution sleeve is fixed to the other end of the housing and sleeved on the central shaft. The distribution sleeve is provided with an inlet channel and an outlet channel, which are used to intermittently connect the main liquid inlet channel with the inlet channel and the main liquid outlet channel with the outlet channel when the central shaft rotates.

[0004] Optionally, the variable volume metering unit includes: A fixed end plate is disposed at the end of the support arm; The movable end plate is disposed opposite to the fixed end plate and is slidably connected to the fixed end plate; A retractable volumetric cavity, with its first end connected to the fixed end plate and its other end fixedly connected to the movable end plate; A cam follower is mounted on the movable end plate and is rotatably connected to the cam groove.

[0005] Optionally, the fixed end plate is provided with a plurality of guide arms extending toward one side of the movable end plate at equal intervals on its periphery, and each guide arm has a guide hole at its end. The movable end plate is provided with a plurality of guide rods at equal intervals on its periphery, and the plurality of guide rods correspond one-to-one with the plurality of guide holes and are slidably connected.

[0006] Optionally, a plurality of spaced-apart liquid inlet distribution channels and liquid outlet distribution channels are respectively provided on the circumferential side of the central shaft. The plurality of liquid inlet distribution channels are respectively connected to the main liquid inlet channel, and the plurality of liquid outlet distribution channels are respectively connected to the main liquid outlet channel. The plurality of liquid inlet distribution channels are located on the same circumferential surface, and the plurality of liquid outlet distribution channels are located on the same circumferential surface, and the liquid inlet distribution channels and the liquid outlet distribution channels are offset from each other in the axial direction.

[0007] Optionally, the bottom of the cam groove is formed with alternating stretching ramp sections and compression ramp sections. The stretching ramp sections are adapted to allow the variable volume metering unit to axially extend under fluid pressure to draw in fluid, and the compression ramp sections are adapted to axially compress the variable volume metering unit to discharge fluid.

[0008] Optionally, the inner wall of the distribution sleeve is provided with an inlet groove and an outlet groove, the inlet groove is connected to the inlet channel, the outlet groove is connected to the outlet channel, and the inlet groove and multiple liquid inlet distribution grooves are located on the same plane, and the outlet groove and multiple liquid outlet distribution grooves are located on the same plane.

[0009] Optionally, the inlet channel and the outlet channel are respectively opened at the ends of the distribution sleeve and extend along the axial direction of the distribution sleeve. One end of the inlet channel is connected to the inlet groove, and the other end is used to connect to an external pipeline. One end of the outlet channel is connected to the outlet groove, and the other end is used to connect to an external pipeline.

[0010] Optionally, it further includes a second end cap, which is disposed at the end of the housing away from the first end cap, and the distribution sleeve is disposed on the second end cap.

[0011] Optionally, it also includes a speed detection device, which includes an active magnetic coupling element, a passive magnetic coupling element, a sealed spacer, and a sensor; The enclosed spacer is fixedly installed on the first end cover, and the active magnetic coupling element is disposed inside the enclosed spacer and fixedly connected to the end of the central shaft; The passive magnetic coupling element is rotatably sleeved outside the closed spacer and is magnetically coupled to the active magnetic coupling element in a non-contact manner. The sensor is fixed to the first end cap and is used to detect the rotational speed of the passive magnetic coupling component.

[0012] Optionally, the housing is made of carbon fiber material.

[0013] Compared to existing technologies, the present invention achieves a periodic change in volume by setting a support on the central shaft and having variable volume metering units distributed circumferentially along the support, which, in conjunction with the cam groove on the first end cover, drive the variable volume metering units to extend and retract axially. At the same time, intermittent flow distribution is achieved through the rotational engagement of the distribution sleeve with the central shaft. This realizes volumetric fluid metering without rigid meshing, solving the problems of friction and wear, increased gaps, and increased internal leakage caused by rotor meshing and scraper sliding in traditional volumetric flow meters, which affect metering accuracy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 This is a schematic diagram of the central shaft structure of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the central axis of the present invention; Figure 5 This is a schematic diagram of the support structure of the present invention; Figure 6 This is a schematic diagram of the variable volume metering unit structure of the present invention; Figure 7 This is a schematic diagram of the fixed end plate and guide arm structure of the present invention; Figure 8 This is a schematic diagram of the distribution sleeve structure of the present invention; Figure 9 This is a schematic diagram of the distribution sleeve and the second end cap structure of the present invention; Figure 10 This is a schematic diagram of the rotational speed detection device of the present invention; Explanation of reference numerals in the attached drawings: 1. Housing; 2. Central shaft; 3. Support; 4. First end cover; 5. Variable volume metering unit; 6. Distribution sleeve; 9. Second end cover; 10. Rotation speed detection device; 21. Main inlet channel; 22. Main outlet channel; 23. Inlet distribution groove; 24. Outlet distribution groove; 30. Support arm; 31. Inlet branch channel; 32. Outlet branch channel; 40. Cam groove; 50. Cam follower; 51. Fixed end plate; 52. Movable end plate; 53. Telescopic volume cavity; 55. Guide arm; 551. Guide hole; 552. Connecting hole; 56. Guide rod; 61. Inlet channel; 62. Outlet channel; 63. Inlet groove; 64. Outlet groove; 91. Shaft hole; 101. Active magnetic coupling element; 102. Passive magnetic coupling element; 103. Sealing sleeve; 104. Sensor. Detailed Implementation

[0015] To facilitate understanding of this application, a more detailed description of the application is provided below with reference to the accompanying drawings and specific embodiments; preferred embodiments of the application are shown in the drawings; however, the application may be implemented in many different forms and is not limited to the embodiments described in this specification; rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this application.

[0016] It should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and back) are used to explain the structure and movement of various components and are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0017] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; it should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0018] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0019] like Figures 1-5 As shown, one embodiment of the present invention is a carbon fiber rotor volumetric flow meter, which includes a housing 1, a central shaft 2, a bracket 3, a first end cover 4, multiple variable volumetric metering units 5, and a flow distribution sleeve 6.

[0020] The shell 1 is cylindrical and has an inner cavity for accommodating internal components; The central shaft 2 is rotatably disposed inside the housing 1. The central shaft 2 has an inlet main channel 21 and an outlet main channel 22 axially formed inside it. The inlet main channel 21 and the outlet main channel 22 are independent of each other and are not connected to each other.

[0021] The bracket 3 is fixedly installed on the central shaft 2 and rotates synchronously with the central shaft 2. The bracket 3 has three support arms 30 evenly distributed along the circumference. Each support arm 30 has an inlet branch channel 31 and an outlet branch channel 32. The inlet branch channel 31 is connected to the inlet main channel 21 on the central shaft 2, and the outlet branch channel 32 is connected to the outlet main channel 22 on the central shaft 2. The bracket is made of carbon fiber material.

[0022] The first end cap 4 is fixedly installed at one end of the housing 1. An annular cam groove 40 is provided on the side end face of the first end cap 4 facing the inner cavity of the housing 1. The depth of the cam groove 40 varies periodically in the circumferential direction.

[0023] Three variable volume metering units 5 are respectively installed at the ends of three support arms 30. Each variable volume metering unit 5 has a cavity with an adjustable internal volume. The internal cavity of each variable volume metering unit 5 is connected to the inlet branch channel 31 and the outlet branch channel 32 on the corresponding support arm 30. The axial length of the variable volume metering unit 5 can be extended as fluid enters and shortened as fluid exits. The end of each variable volume metering unit 5 away from the bracket 3 is in rolling engagement with the cam groove 40.

[0024] The distribution sleeve 6 is fixed to the other end of the housing 1 and sleeved on the central shaft 2, and coaxially sleeved on the outer periphery of the central shaft 2. The central shaft 2 can rotate inside the distribution sleeve 6. The distribution sleeve 6 is provided with an inlet flow channel 61 and an outlet flow channel 62. The inlet flow channel 61 is used to connect to the external liquid inlet pipeline, and the outlet flow channel 62 is used to connect to the external liquid outlet pipeline. When the central shaft 2 rotates, the inlet main channel 21 on the central shaft 2 is intermittently connected to the inlet flow channel 61; similarly, the outlet main channel 22 is intermittently connected to the outlet flow channel 62.

[0025] During operation, a fluid under certain pressure enters from the inlet channel 61 of the distribution sleeve 6, passes through the inlet groove 63 on the inner wall of the distribution sleeve 6, enters the main inlet channel 21 of the central shaft 2, and then enters the cavity of the corresponding variable volume metering unit 5 through the inlet branch channel 31 in the support arm 30. The fluid pressure pushes the variable volume metering unit 5 to extend axially, causing its bottom to move towards the bottom of the cam groove 40. The reaction force at the bottom of the groove generates a tangential component force, which pushes the bracket 3 and the central shaft 2 to rotate. The groove depth of the cam groove 40 changes periodically in the circumferential direction. The axial position of the variable volume metering unit 5 is constrained by the bottom of the groove, thereby limiting the extension and retraction stroke of the variable volume metering unit 5 and the geometric locking of the metering volume. As the groove depth of the cam groove 40 gradually increases, the internal volume of the variable volume metering unit 5 continuously expands. The fluid is drawn in; as the depth of the cam groove 40 gradually decreases, the axial length of the variable volume metering unit 5 is shortened, the internal volume shrinks, the main liquid inlet channel 21 is disconnected from the inlet channel 61, and the main liquid outlet channel 22 is connected to the outlet channel 62, so that the fluid is discharged through the outlet branch channel 32, the main liquid outlet channel 22, and the outlet channel 62. The central shaft 2 continues to rotate, and multiple metering units sequentially complete the liquid drawing and discharging process, realizing continuous fluid metering. The rotation speed of the central shaft 2 is proportional to the flow rate of the fluid passing through.

[0026] This application achieves periodic volume change by setting a bracket 3 on the central shaft 2 and having variable volume metering units 5 distributed circumferentially along the bracket 3. The variable volume metering units 5 are driven to extend and retract axially by the cam groove 40 on the first end cover 4. At the same time, intermittent flow distribution is achieved by the rotational cooperation between the flow distribution sleeve 6 and the central shaft 2. This realizes volumetric fluid metering without rigid meshing, and solves the problems of friction and wear, increased gaps, and increased internal leakage caused by rotor meshing and scraper sliding in traditional volumetric flow meters, which affect the metering accuracy.

[0027] In one embodiment, such as Figure 6 As shown, the variable volume metering unit 5 specifically includes a fixed end plate 51, a movable end plate 52, a retractable volume cavity 53, and a cam follower 50.

[0028] The fixed end plate 51 is fixedly installed at the end of the support arm 30. The movable end plate 52 is arranged opposite to the fixed end plate 51, and there is a certain distance between them in the axial direction. This distance can change with the movement of the movable end plate 52. The movable end plate 52 and the fixed end plate 51 are slidably connected in the axial direction, so that the movable end plate 52 can move away from the fixed end plate 51 in the axial direction, but cannot rotate relative to the fixed end plate 51.

[0029] The retractable volume chamber 53 is located between the fixed end plate 51 and the movable end plate 52. Its first end is sealed to the fixed end plate 51, and its second end is fixedly connected to the movable end plate 52. The retractable volume chamber 53 forms a metering chamber, and its volume changes with the distance between the movable end plate 52 and the fixed end plate 51. The retractable volume chamber 53 can be made of metal bellows, rubber bellows, or other axially retractable sealed chambers. The cam follower 50 is set on the movable end plate 52. Specifically, it can be a roller or a ball plunger. Its end is located in the cam groove 40 of the first end cover 4 and rolls in contact with the bottom of the cam groove 40.

[0030] During operation, when fluid enters the expandable volume chamber 53 through the inlet branch channel 31, the fluid pressure pushes the movable end plate 52 to move away from the fixed end plate 51, causing the expandable volume chamber 53 to extend axially and increase its internal volume. Fluid continues to enter the volume chamber, and the cam follower 50 rolls along the bottom of the cam groove 40. During the discharge stroke, the bottom of the cam groove 40 is forced by the cam follower 50 to move the movable end plate 52 closer to the fixed end plate 51, causing the expandable volume chamber 53 to be axially compressed and its internal volume to decrease. The fluid in the chamber is then discharged through the outlet branch channel 32.

[0031] In one embodiment, such as Figure 7 As shown, three guide arms 55 extending toward one side of the movable end plate 52 are equidistantly arranged on the periphery of the fixed end plate 51. The guide arms 55 are evenly distributed around the fixed end plate 51. Each guide arm 55 has a guide hole 551 at its end. The axis of the guide hole 551 is parallel to the extension and retraction direction of the retractable volume cavity 53.

[0032] like Figure 6 , Figure 7 As shown, three guide rods 56 are equidistantly arranged on the periphery of the movable end plate 52, and the positions of the guide rods 56 correspond one-to-one with the guide holes 551 on the guide arm 55. Each guide rod 56 is inserted into the corresponding guide hole 551 and can slide freely along the axial direction. The sliding fit between the guide rods 56 and the guide holes 551 provides precise guidance for the axial translation of the movable end plate 52, ensuring that the movable end plate 52 does not deviate during its movement; on the other hand, it restricts the rotation of the movable end plate 52 relative to the fixed end plate 51 around the axis, preventing the expandable volume cavity 53 from being damaged by torsional deformation.

[0033] In one embodiment, such as Figure 7 As shown, a connecting hole 552 is provided on the fixed end plate 51. One end of the connecting hole 552 is connected to the interior of the retractable volume cavity 53, and the other end is connected to the inlet branch channel 31 and the outlet branch channel 32 on the support arm 30 respectively. Fluid enters and exits the retractable volume cavity 53 through the connecting hole 552.

[0034] In one embodiment, such as Figure 3 , Figure 4 As shown, multiple inlet distribution channels 23 and outlet distribution channels 24 are respectively provided on the circumferential side of the central shaft 2.

[0035] Specifically, the number of liquid inlet distribution channels 23 is the same as the number of support arms 30, both being three. They are evenly distributed circumferentially along the outer surface of the central shaft 2, and the three liquid inlet distribution channels 23 are located in the same circumferential surface, that is, they are in the same axial position. Each liquid inlet distribution channel 23 is connected to the main liquid inlet channel 21 inside the central shaft 2 through a radial hole. A closed partition is provided between adjacent liquid inlet distribution channels 23.

[0036] There are also three liquid distribution channels 24, which are evenly distributed around the outer circumference of the central axis 2. The three liquid distribution channels 24 are located in the same circumferential surface. Each liquid distribution channel 24 is connected to the main liquid outlet channel 22 inside the central axis 2 through a radial hole. There are also closed partitions between adjacent liquid distribution channels 24.

[0037] The circumferential surface of the liquid inlet distribution channel 23 and the circumferential surface of the liquid outlet distribution channel 24 are offset from each other in the axial direction, that is, they are not located in the same axial position, so as to ensure the isolation of the liquid inlet and liquid outlet channels.

[0038] The inlet distribution channel 23 and the outlet distribution channel 24 are arranged alternately in the circumferential direction, that is, there is an outlet distribution channel 24 on each side of each inlet distribution channel 23, and there is an inlet distribution channel 23 on each side of each outlet distribution channel 24.

[0039] During operation, as the central shaft 2 rotates, the liquid inlet distribution channel 23 rotates synchronously with the central shaft 2. When a liquid inlet distribution channel 23 rotates to align with the inlet channel 63 on the inner wall of the distribution sleeve 6, the variable volume metering unit 5 corresponding to that liquid inlet distribution channel 23 is in the suction stroke. When a liquid outlet distribution channel 24 rotates to align with the outlet channel 64 on the inner wall of the distribution sleeve 6, the variable volume metering unit 5 corresponding to that liquid outlet distribution channel 24 is in the discharge stroke.

[0040] In one embodiment, such as Figure 2As shown, the bottom of the cam groove 40 is specifically formed with alternating stretching ramp sections and compression ramp sections. Within one cycle, the bottom of the cam groove 40 includes a stretching ramp section, a straight section, and a compression ramp section. The depth of the stretching ramp section gradually increases from shallow to deep, and its ramp angle allows the cam follower 50 to roll deeper along the ramp under fluid pressure. The depth of the compression ramp section gradually decreases from deep to shallow, and its ramp angle allows the bottom of the groove to forcibly push the cam follower 50 to move towards the shallower area. The straight section connects the stretching ramp section and the compression ramp section, with a constant groove depth, serving as a switching buffer.

[0041] When the cam follower 50 is in the stretching ramp section, the variable volume metering unit 5 can extend along the ramp axis under the action of fluid pressure, continuously entering the fluid; when the cam follower 50 is in the compression ramp section, the bottom of the cam groove 40 forcibly pushes the cam follower 50, causing the variable volume metering unit 5 to be axially compressed, thereby discharging the fluid; when the cam follower 50 is in the straight section, the variable volume metering unit 5 neither sucks in nor discharges, and is in a switching transition state.

[0042] In one embodiment, such as Figure 3 , Figure 8 As shown, the inner wall of the distribution sleeve 6 is provided with an inlet groove 63 and an outlet groove 64. The inlet groove 63 and the liquid inlet distribution groove 23 on the central shaft 2 are located on the same plane in the axial direction, so that when the central shaft 2 is rotated to the point where the liquid inlet distribution groove 23 and the inlet groove 63 are aligned, the two can be directly connected. Similarly, the outlet groove 64 and the liquid outlet distribution groove 24 on the central shaft 2 are located on the same plane in the axial direction.

[0043] Both the inlet channel 63 and the outlet channel 64 are fan-shaped channels partially opened along the inner circumference of the distribution sleeve 6. The opening angle range of the inlet channel 63 corresponds to the stretching ramp section of the cam channel 40. That is, when the cam follower 50 of the variable volume metering unit 5 is in the stretching ramp section, the liquid inlet distribution channel 23 corresponding to the variable volume metering unit 5 rotates to the position aligned with the inlet channel 63. The opening angle range of the outlet channel 64 corresponds to the compression ramp section of the cam channel 40. That is, when the cam follower 50 of the variable volume metering unit 5 is in the compression ramp section, the liquid outlet distribution channel 24 corresponding to the variable volume metering unit 5 rotates to the position aligned with the outlet channel 64.

[0044] The inlet channel 63 and the outlet channel 64 are staggered on the circumference, with the closed surface area of ​​the inner wall of the distribution sleeve 6 between them. Thus, when the central shaft 2 rotates, the main inlet channel 21 rotates with the central shaft 2 and intermittently connects with the inlet channel 63, and the main outlet channel 22 rotates with the central shaft 2 and intermittently connects with the outlet channel 64, realizing automatic switching of the flow path.

[0045] In one embodiment, such as Figure 8 , Figure 9As shown, inlet channel 61 and outlet channel 62 are respectively opened at the ends of distribution sleeve 6; inlet channel 61 extends axially along distribution sleeve 6, one end of which communicates with inlet groove 63 on inner wall of distribution sleeve 6, and the other end is led out from end face of distribution sleeve 6 for connection with external liquid inlet pipeline. Outlet channel 62 also extends axially along distribution sleeve 6, one end of which communicates with outlet groove 64 on inner wall of distribution sleeve 6, and the other end is led out from end face of distribution sleeve 6 for connection with external liquid drain pipeline.

[0046] The axially extended flow channel layout ensures that the interfaces of the inlet flow channel 61 and the outlet flow channel 62 are located on the same end face of the distribution sleeve 6, which facilitates the centralized connection and arrangement of external pipelines.

[0047] In one embodiment, such as Figure 9 As shown, the carbon fiber rotor volumetric flow meter also includes a second end cover 9; the second end cover 9 is located at the end of the housing 1 away from the first end cover 4 and opposite to the first end cover 4. The distribution sleeve 6 is fixedly installed on the outer end of the second end cover 9. The center of the second end cover 9 has a shaft hole 91 for installing the central shaft 2. The distribution sleeve 6 is located at the outer end of the shaft hole 91 and closes the end of the central shaft 2.

[0048] The second end cap 9 and the first end cap 4 respectively seal the internal space of the housing 1 from both ends, forming a sealed installation cavity to protect the internal rotating components; the distribution sleeve 6 is fixed on the second end cap 9 and remains stationary, while the end of the central shaft 2 rotates inside the distribution sleeve 6, and the two form a stable rotating distribution.

[0049] In one embodiment, such as Figure 10 As shown, the carbon fiber rotor volumetric flow meter also includes a speed detection device 10, which includes an active magnetic coupling element 101, a passive magnetic coupling element 102, a closed sleeve 103, and a sensor 104.

[0050] A closed spacer 103 is fixedly installed on the first end cap 4. The closed spacer 103 has a cup-shaped structure with one end open and the other end closed, and the open end is fixedly connected to the first end cap 4. An active magnetic coupling element 101 is disposed inside the closed spacer 103 and is fixedly connected to the end of the central shaft 2, rotating synchronously with the central shaft 2. Multiple magnetic poles are evenly distributed along the circumference of the active magnetic coupling element 101.

[0051] The passive magnetic coupling element 102 is rotatably sleeved outside the enclosed spacer 103 and supported by bearings. Multiple magnetic poles are also evenly distributed circumferentially on the passive magnetic coupling element 102. The magnetic poles of the passive magnetic coupling element 102 are magnetically coupled to the magnetic poles of the active magnetic coupling element 101 without contact, so that when the active magnetic coupling element 101 rotates with the central axis 2, the passive magnetic coupling element 102 rotates synchronously.

[0052] Sensor 104 is fixed to the first end cap 4, and a Hall effect sensor 104 can be used. The sensing end of sensor 104 is close to the outer surface of the passive magnetic coupling member 102. When the passive magnetic coupling member 102 rotates, its magnetic poles alternately pass through the sensing end of sensor 104, and sensor 104 outputs a pulse signal with a frequency proportional to the rotation speed. The cumulative flow or instantaneous flow can be calculated by detecting the number or frequency of pulses.

[0053] In one embodiment, the support 3 and / or the housing 1 are made of carbon fiber. Carbon fiber composite materials have the advantages of high specific strength, low density, and corrosion resistance. The support 3 is made of carbon fiber, which can effectively reduce the rotational inertia of the rotating parts, improve the flow meter's response sensitivity to small flow rates, and reduce the starting pressure difference. The housing 1 is made of carbon fiber, which can reduce the overall weight, improve corrosion resistance, and expand the flow meter's applicable media range.

[0054] Carbon fiber materials have a low coefficient of thermal expansion, which can maintain the stability of structural dimensions under temperature change conditions, which is beneficial to maintaining the long-term consistency of measurement accuracy. In addition, carbon fiber materials have self-lubricating properties, which can reduce frictional resistance to a certain extent.

[0055] It should be noted that the above-mentioned technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this invention specification; and, for those skilled in the art, improvements or modifications can be made based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A carbon fiber rotor volumetric flow meter, characterized in that, include: Shell (1); The central shaft (2) is rotatably disposed inside the housing (1), and has an inlet main channel (21) and an outlet main channel (22) inside. The bracket (3) is fixed on the central shaft (2). The bracket (3) has multiple support arms (30) distributed circumferentially. Each support arm (30) has an inlet branch channel (31) and an outlet branch channel (32). The inlet branch channel (31) is connected to the inlet main channel (21), and the outlet branch channel (32) is connected to the outlet main channel (22). The bracket (3) is made of carbon fiber material. The first end cap (4) is disposed at one end of the housing (1). The first end cap (4) has an annular cam groove (40) on the side facing the housing (1). The groove depth of the cam groove (40) changes periodically in the circumferential direction. Multiple variable volume metering units (5) are respectively installed on the support arm (30). Each variable volume metering unit (5) is connected to the inlet branch channel (31) and the outlet branch channel (32) on the corresponding support arm (30). The axial length of the variable volume metering unit (5) can change with the entry or exit of the fluid. The end of each variable volume metering unit (5) away from the bracket (3) is rolledly connected to the cam groove (40). A distribution sleeve (6) is fixed to the other end of the housing (1) and sleeved on the central shaft (2). The distribution sleeve (6) is provided with an inlet channel (61) and an outlet channel (62), which are used to make the liquid inlet main channel (21) intermittently connected with the inlet channel (61) and the liquid outlet main channel (22) intermittently connected with the outlet channel (62) when the central shaft (2) rotates. The variable volume metering unit (5) includes: A fixed end plate (51) is disposed at the end of the support arm (30); The movable end plate (52) is disposed opposite to the fixed end plate (51) and is slidably connected to the fixed end plate (51); The retractable volume cavity (53) has its first end connected to the fixed end plate (51) and its other end fixedly connected to the movable end plate (52); A cam follower (50) is mounted on the movable end plate (52) and is tactilely connected to the cam groove (40).

2. The carbon fiber rotor volumetric flow meter according to claim 1, characterized in that, The fixed end plate (51) is provided with a plurality of guide arms (55) extending toward one side of the movable end plate (52) at equal intervals around its periphery. Each guide arm (55) has a guide hole (551) at its end. The movable end plate (52) is provided with a plurality of guide rods (56) at equal intervals around its periphery. The plurality of guide rods (56) correspond one-to-one with the plurality of guide holes (551) and are slidably connected.

3. The carbon fiber rotor volumetric flow meter according to claim 1, characterized in that, The central shaft (2) has multiple spaced inlet distribution channels (23) and outlet distribution channels (24) on its circumferential side. The multiple inlet distribution channels (23) are connected to the main inlet channel (21), and the multiple outlet distribution channels (24) are connected to the main outlet channel (22). The multiple inlet distribution channels (23) are located on the same circumferential surface, and the multiple outlet distribution channels (24) are located on the same circumferential surface. The inlet distribution channels (23) and the outlet distribution channels (24) are staggered from each other in the axial direction.

4. The carbon fiber rotor volumetric flow meter according to claim 1, characterized in that, The bottom of the cam groove (40) is formed with alternating stretching ramps and compression ramps. The stretching ramps are adapted to allow the variable volume metering unit (5) to extend axially under fluid pressure to draw in fluid, and the compression ramps are adapted to allow the variable volume metering unit (5) to compress axially to discharge fluid.

5. The carbon fiber rotor volumetric flow meter according to claim 3, characterized in that, The inner wall of the distribution sleeve (6) is provided with an inlet groove (63) and an outlet groove (64). The inlet groove (63) is connected to the inlet channel (61), and the outlet groove (64) is connected to the outlet channel (62). The inlet groove (63) and a plurality of liquid inlet distribution grooves (23) are located on the same plane, and the outlet groove (64) and a plurality of liquid outlet distribution grooves (24) are located on the same plane.

6. The carbon fiber rotor volumetric flow meter according to claim 5, characterized in that, The inlet channel (61) and the outlet channel (62) are respectively opened at the ends of the distribution sleeve (6) and extend along the axial direction of the distribution sleeve (6). One end of the inlet channel (61) is connected to the inlet groove (63), and the other end is used to connect to the external pipeline. One end of the outlet channel (62) is connected to the outlet groove (64), and the other end is used to connect to the external pipeline.

7. The carbon fiber rotor volumetric flow meter according to claim 1, characterized in that, It also includes a second end cap (9), which is disposed at one end of the housing (1) away from the first end cap (4), and the distribution sleeve (6) is disposed on the second end cap (9).

8. The carbon fiber rotor volumetric flow meter according to claim 1, characterized in that, It also includes a speed detection device (10), which includes an active magnetic coupling element (101), a passive magnetic coupling element (102), a closed spacer (103), and a sensor (104). The closed sleeve (103) is fixedly installed on the first end cover (4), and the active magnetic coupling element (101) is located inside the closed sleeve (103) and is fixedly connected to the end of the central shaft (2); The passive magnetic coupling element (102) is rotatably sleeved outside the closed spacer (103) and is magnetically non-contactly coupled to the active magnetic coupling element (101); The sensor (104) is fixed on the first end cap (4) and is used to detect the rotational speed of the passive magnetic coupling element (102).

9. The carbon fiber rotor volumetric flow meter according to claim 1, characterized in that, The shell (1) is made of carbon fiber material.

Images