CN112484795A - High-voltage-resistant electromagnetic flow sensor - Google Patents
High-voltage-resistant electromagnetic flow sensor Download PDFInfo
- Publication number
- CN112484795A CN112484795A CN202011399957.XA CN202011399957A CN112484795A CN 112484795 A CN112484795 A CN 112484795A CN 202011399957 A CN202011399957 A CN 202011399957A CN 112484795 A CN112484795 A CN 112484795A
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- China
- Prior art keywords
- electrode
- flow sensor
- electromagnetic flow
- insulating sleeve
- base pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/584—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/14—Casings, e.g. of special material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a high-voltage-resistant electromagnetic flow sensor, which comprises a base pipe (1); the bottom of the base pipe (1) is of a cylindrical body (2) structure, an external thread (3) is arranged on the excircle of the cylindrical body (2), and the external thread (3) is in threaded connection with the lower joint (4); a base pipe (1) at the top of the cylinder (2) is of a circular pipe (8) structure, and an insulating sleeve (6) is arranged between the base pipe (1) and a shaft shoulder (5) of the excircle of the lower joint (4); a group of electrodes (7) which are uniformly distributed along the circumference are arranged on the insulating sleeve (6); the electrode (7) is in a screw shape, and the thread section of the electrode (7) penetrates through the circular tube (8) of the base tube (1) and extends to the inner hole of the circular tube (8) of the base tube (1). The invention replaces the scheme that the existing electromagnetic flow sensor adopts hydraulic oil filled inside to balance the external pressure, greatly simplifies the structure of the electromagnetic flow sensor and improves the working reliability of the instrument.
Description
Technical Field
The invention relates to a high-pressure-resistant electromagnetic flow sensor, and belongs to the technical field of underground instruments.
Background
The electromagnetic flow testing technology is developed according to the Faraday electromagnetic induction principle and is one of the conventional flow testing technologies in oil fields. Due to the limitation of application environment, the existing electromagnetic flow meter suitable for flow test in an oilfield well is of an outer flow channel type, and the diameter of the electromagnetic flow meter is (32-42) mm. The core of the instrument, namely the flow sensor part, has basically the same structural composition and principle. This part is by four metal electrode circumference equipartitions on the outer tube with instrument diameter the same size, and outer tube internally mounted has excitation coil, and the magnetic field that excitation coil produced pierces through the outer tube, and the change of the outer tube outside medium flow can generate induced voltage on the electrode, can convert out the size of external flow through induced voltage size. According to the analysis of the test principle and the application environment condition, how to bear the ultrahigh external pressure on the premise of ensuring that the metal electrode is insulated from the instrument shell becomes the difficulty of the structural design of the electromagnetic flow sensor.
In order to meet the requirements, hydraulic oil media are filled in the flow sensor part of the electromagnetic flow testing product for the oil field, and a balance piston or a rubber capsule is structurally designed. When the part is subjected to external pressure, the hydraulic oil filled inside is compressed through the motion of the balance piston or the deformation of the rubber capsule, and due to the incompressibility of liquid, the design can achieve the balance of the internal pressure and the external pressure of the instrument, so that the possibility is provided for realizing the insulation of the electrode on the follow-up structure and ensuring the ultrahigh pressure strength. However, the electromagnetic flow sensor adopting the dynamic pressure balance structure has a very complicated structure, is very difficult to produce and assemble, and meanwhile, the part also needs to be periodically filled with oil for maintenance on site, so that the reliability of the electromagnetic flow sensor in long-time work is very low. Therefore, the prior art still has the defects and needs to be further improved.
Disclosure of Invention
The invention aims to provide a high-voltage-resistant electromagnetic flow sensor to solve the problems that the existing electromagnetic flow sensor is complex in structure, difficult to produce and assemble, low in working reliability and the like, and needs to be periodically filled with oil for maintenance, so that the defects of the prior art are overcome.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a high-voltage-resistant electromagnetic flow sensor, which comprises a base pipe; the bottom of the base pipe is of a cylindrical structure, the outer circle of the cylinder is provided with external threads, and the external threads are in threaded connection with the lower connector; the base pipe at the top of the cylinder is of a circular pipe structure, and an insulating sleeve is arranged between the base pipe and a shaft shoulder of the excircle of the lower connector; a group of electrodes which are uniformly distributed along the circumference are arranged on the insulating sleeve; the electrode is screw-shaped, and the screw thread section of the electrode runs through the circular tube of the base tube and extends to the circular tube inner hole of the base tube.
In the high-voltage-resistant electromagnetic flow sensor, the insulating sleeve is made of high-strength engineering plastic polyetheretherketone.
Among the aforementioned high pressure resistant electromagnetic flow sensor, insulating cover closely overlaps on base pipe and lower clutch, adopts zero clearance interference fit between insulating cover and base pipe and the lower clutch.
Among the aforementioned high pressure resistant electromagnetic flow sensor, adopt sealing washer sealing connection between insulating cover upper end and the base pipe and between insulating cover lower extreme and the lower clutch, insulating cover both ends sealing washer model specification is the same.
In the high-voltage-resistant electromagnetic flow sensor, the axial section of the electrode is of a T-shaped structure, an electrode cap is arranged at one end of the electrode, a sealing groove is formed in the cylindrical section of the electrode, and an electrode sealing ring is arranged in the sealing groove; the electrode sealing ring is connected with the insulating sleeve in a sealing way.
In the high-voltage-resistant electromagnetic flow sensor, the diameter of the electrode cap is 2-3 times of that of the cylindrical section of the electrode.
By adopting the technical scheme, the invention meets the requirement that the outer pipe part of the electromagnetic flow sensor can bear the external ultrahigh pressure and simultaneously realize the electrode insulation, cancels the scheme that the traditional electromagnetic flow sensor adopts hydraulic oil filled inside to balance the external pressure, greatly simplifies the structure of the electromagnetic flow sensor and improves the working reliability of instruments. The structure of the electromagnetic flow sensor is suitable for the structural design of the flow sensor part of the underground external flow channel type electromagnetic flow meter for the oil field.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
fig. 3 is an isometric view of fig. 1.
The labels in the figures are: 1-base tube, 2-cylinder, 3-external thread, 4-lower joint, 5-shaft shoulder, 6-insulating sleeve, 7-electrode, 8-round tube, 9-sealing ring, 10-electrode cap, 11-sealing groove and 12-electrode sealing ring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention discloses a high-voltage-resistant electromagnetic flow sensor, which comprises a base pipe 1 as shown in figures 1-3; the bottom of the base pipe 1 is of a cylinder 2 structure, the outer circle of the cylinder 2 is provided with an external thread 3, and the external thread 3 is in threaded connection with a lower joint 4; the base pipe 1 at the top of the cylinder 2 is of a round pipe 8 structure, and an insulating sleeve 6 is arranged between the base pipe 1 and a shaft shoulder 5 of the excircle of the lower connector 4; a group of electrodes 7 which are uniformly distributed along the circumference are arranged on the insulating sleeve 6; the electrode 7 is in a screw shape, and the thread section of the electrode 7 penetrates through the circular tube 8 of the base tube 1 and extends to the inner hole of the circular tube 8 of the base tube 1. The insulating sleeve 6 is made of high-strength engineering plastic polyetheretherketone. Insulating cover 6 closely overlaps on base pipe 1 and lower clutch 4, adopts zero clearance interference fit between insulating cover 6 and base pipe 1 and the lower clutch 4. Sealing rings 9 are adopted to be connected between the upper end of the insulating sleeve 5 and the base pipe 1 and between the lower end of the insulating sleeve 5 and the lower connector 4 in a sealing mode, and the sealing rings at the two ends of the insulating sleeve 5 are the same in model specification. The axial section of the electrode 7 is of a T-shaped structure, an electrode cap 10 is arranged at one end of the electrode 7, a sealing groove 11 is arranged at the cylindrical section of the electrode 7, and an electrode sealing ring 12 is arranged in the sealing groove 11; the electrode sealing ring 12 is connected with the insulating sleeve 6 in a sealing way. The diameter of the electrode cap 10 is 2-3 times of the diameter of the cylindrical section of the electrode 7.
Examples
The main body of this example is composed of a base pipe 1, an insulating sleeve 6, and a lower joint 4, as shown in fig. 1 to 3, for example. The inner cavity of the base tube 1 is used for installing other electronic components required by the sensor such as a coil. The insulating sleeve 6 is processed by high-strength engineering plastic Polyetheretherketone (PEEK), and certain strength and insulating requirements are guaranteed. Insulating cover 6 closely overlaps on base pipe 1 and lower clutch 4, and the fit dimension adopts interference fit each other, ensures that insulating cover 6 internal clearance is zero, and the power that insulating cover 6 bore when receiving external pressure like this will evenly transmit for inside base pipe 1 and lower clutch 4, can not have the cavity because of inside and warp too big damage that leads to. Two ends of the insulating sleeve 6 are sealed by sealing rings 9, and the two ends of the insulating sleeve 6 adopt the sealing rings with the same model and specification to ensure that the axial stress on two sides of the insulating sleeve 6 is balanced under a pressure environment. Four electrodes 7 are uniformly distributed on the circumference of the insulating sleeve 6, and the electrodes 7 are metal electrodes. The four electrodes 7 are hermetically arranged on the insulating sleeve 6 through electrode sealing rings 12 so as to ensure the insulating requirement between the electrodes 7 and other metal parts of the sensor. One end of the electrode 7 is provided with an electrode cap 10, a stress step is formed by the electrode cap 10, and the force generated when the electrode 7 is subjected to the external pressure is borne by the electrode cap 10. The diameter of the electrode sealing ring 12 is as small as possible, and the area of the stress step surface is as large as possible, so that the force of the electrode 7 acting on the insulating sleeve 6 under the action of the external pressure is as small as possible, and the insulating sleeve 6 is ensured not to be crushed. Since the insulating sleeve 6 fits tightly over the base tube 1, the forces of the electrode 7 acting on the insulating sleeve 6 will eventually also be taken up by the base tube 1. The force of external pressure acting on the insulating sleeve 6 is transferred to the base pipe 1 and the lower joint 4 made of metal materials, and the pressure bearing capacity of the electromagnetic flow sensor is remarkably improved on the premise of ensuring the insulation of the electrode 7.
The invention realizes the requirement that the outer pipe part of the electromagnetic flow sensor can bear the external ultrahigh pressure and realize the electrode insulation at the same time, cancels the scheme that the traditional electromagnetic flow sensor adopts hydraulic oil filled inside to balance the external pressure, greatly simplifies the structure of the electromagnetic flow sensor and improves the working reliability of the instrument. The structure of the electromagnetic flow sensor is suitable for the structural design of the flow sensor part of the underground external flow channel type electromagnetic flow meter for the oil field.
Claims (6)
1. A high pressure resistant electromagnetic flow sensor comprising a base tube (1); the method is characterized in that: the bottom of the base pipe (1) is of a cylindrical body (2) structure, an external thread (3) is arranged on the excircle of the cylindrical body (2), and the external thread (3) is in threaded connection with the lower joint (4); a base pipe (1) at the top of the cylinder (2) is of a circular pipe (8) structure, and an insulating sleeve (6) is arranged between the base pipe (1) and a shaft shoulder (5) of the excircle of the lower joint (4); a group of electrodes (7) which are uniformly distributed along the circumference are arranged on the insulating sleeve (6); the electrode (7) is in a screw shape, and the thread section of the electrode (7) penetrates through the circular tube (8) of the base tube (1) and extends to the inner hole of the circular tube (8) of the base tube (1).
2. The high pressure resistant electromagnetic flow sensor of claim 1, wherein: the insulating sleeve (6) is processed by high-strength engineering plastic polyetheretherketone.
3. The high pressure resistant electromagnetic flow sensor of claim 1, wherein: insulating cover (6) closely overlaps on base pipe (1) and lower clutch (4), adopts zero clearance interference fit between insulating cover (6) and base pipe (1) and lower clutch (4).
4. The high pressure resistant electromagnetic flow sensor of claim 1, wherein: sealing rings (9) are adopted to be connected between the upper end of the insulating sleeve (5) and the base pipe (1) and between the lower end of the insulating sleeve (5) and the lower joint (4) in a sealing mode, and the sealing rings at the two ends of the insulating sleeve (5) are the same in model specification.
5. The high pressure resistant electromagnetic flow sensor of claim 1, wherein: the axial section of the electrode (7) is of a T-shaped structure, an electrode cap (10) is arranged at one end of the electrode (7), a sealing groove (11) is arranged at the cylindrical section of the electrode (7), and an electrode sealing ring (12) is arranged in the sealing groove (11); the electrode sealing ring (12) is connected with the insulating sleeve (6) in a sealing way.
6. The high pressure resistant electromagnetic flow sensor of claim 1, wherein: the diameter of the electrode cap (10) is 2-3 times of the diameter of the cylindrical section of the electrode (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011399957.XA CN112484795A (en) | 2020-12-04 | 2020-12-04 | High-voltage-resistant electromagnetic flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011399957.XA CN112484795A (en) | 2020-12-04 | 2020-12-04 | High-voltage-resistant electromagnetic flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112484795A true CN112484795A (en) | 2021-03-12 |
Family
ID=74939683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011399957.XA Pending CN112484795A (en) | 2020-12-04 | 2020-12-04 | High-voltage-resistant electromagnetic flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112484795A (en) |
-
2020
- 2020-12-04 CN CN202011399957.XA patent/CN112484795A/en active Pending
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