Position signal indicating device for totally enclosed electrically operated gate valve

Abstract

A kind of position signal indicating device for totally enclosed electric gate valve, including stator, rotor, permanent magnet, magnetic column, magnetic disk, screw plug, stator coil etc.;Its characterized in that: the stator of the valve position signal indicating device is embedded in the base of electric transmission device, uses elastic shaft collar for axial positioning, the rotor, i.e.the output gear shaft of electric transmission device is hollow structure, the permanent magnet is distributed in the light hole of the stator, magnetic column is evenly arranged in the specific plane in the radial direction of rotor, the magnetic disk moves linearly along the axis of hollow rotor by ball screw, the screw plug is cylindrical structure, outer cylindrical surface is provided with thread, is fixed in the threaded hole of the stator by threaded connection.

Description

Technical Field

[0001] This patent relates to a position signal indicating device for valves, and more particularly to a position signal indicating device for a fully enclosed electric gate valve. Background Technology

[0002] Fully enclosed electric gate valves are mostly used in the primary loop systems of nuclear power plants, conveying Class A water (water quality requirements: chloride ion ≤ 0.15 mg / kg; fluoride ion ≤ 0.15 mg / kg; conductivity (25℃) ≤ 200 μs / m; suspended solids ≤ 0.1 mg / kg; SiO2 ≤ 0.1 mg / kg; pH (25℃) 6~8; transparency requires no turbidity, oil, or sediment). They require a safety level of Class I, a quality assurance level of Class A, and a shock resistance category of Class I. Given that fully enclosed electric gate valves operate in a high-temperature (300℃~342℃ water or steam) and high-pressure (21.5 MPa) environment, they operate on a short-time duty system (one opening and closing cycle takes less than 20 seconds). Traditionally, the opening and closing positions of fully enclosed electric gate valves are controlled by feedback signals from a dual-position indicator on the valve cover. Although the feedback signal technology for this position sensor is relatively mature, the dual-position indicator structure limits the system's height and size, and also requires a 24V power supply. Given the current design philosophy that emphasizes miniaturization, this technology is clearly no longer suitable.

[0003] Compared with existing technologies, this fully enclosed electric gate valve uses a position signal indicator device integrated inside the electric drive device, which can accurately feed back the valve position signal. It eliminates the structure and signal power supply of dual position indicators, realizes non-contact measurement, and has the advantages of high accuracy, strong anti-interference ability, and low cost. Summary of the Invention

[0004] The purpose of this invention is to provide a position signal indicating device for a fully enclosed electric gate valve.

[0005] A position signal indicating device for a fully enclosed electric gate valve includes a stator, a rotor, a permanent magnet, a magnetic guide column, a magnetic guide disk, a screw plug, and a stator coil. Its features are:

[0006] The stator is embedded in the base of the electric drive device and is axially positioned using a shaft elastic retaining ring. The rotor is the output gear shaft of the electric drive device and has a hollow structure. The permanent magnets are distributed in the optical holes of the stator, and the magnetic guide columns are evenly arranged in the radial plane of the rotor. The magnetic guide disk moves linearly along the axis of the hollow rotor by a ball screw. The screw plug has a cylindrical structure with threads on the outer cylindrical surface and is fixed in the threaded hole of the stator by a threaded connection.

[0007] The indication method of the position signal indicating device for the fully enclosed electric gate valve is as follows: After the electric drive device is powered on, the magnetic column fixed on the rotor of the position signal indicating device rotates together with the rotor. At the same time, the ball screw with a guide disk at one end moves along the axis of the rotor. When the guide disk approaches the plane where the magnetic column is located, and the magnetic column rotates to approach or move away from the permanent magnet, the magnetic flux in the stator magnetic circuit changes abruptly. This change in magnetic flux is refracted to the waveform of the induced voltage signal output of the stator coil, which is approximately a sine function curve. When the permanent magnet-magnetic column-guide disk coincide, the magnetic circuit is connected and the voltage signal value is the maximum. Conversely, the voltage signal value gradually decreases. The change in the stator coil voltage signal is output to the control element as a position indication signal during the opening / closing of the valve.

[0008] A position signal indicating device for a fully enclosed electric gate valve, characterized in that: the stator is assembled from part one and part two.

[0009] Part 1 is a ring-shaped structure with a rectangular basic cross-section. A through-hole is provided along the radial direction to place a permanent magnet. A reduction process is made on the outer radial side of the ring, with a reduction angle greater than 180 degrees and on the same side as the axis of the through-hole. The reduction thickness and angle are related to Part 2.

[0010] Part 2 is a fan-shaped ring structure with an angle greater than 180 degrees. The basic cross-section of the ring is rectangular-circular-rectangular, with the circular part being 90 degrees. The two rectangular segments are symmetrical, and a threaded hole is opened upward to place a screw plug. The rectangular dimensions are the same as the dimensions of Part 1 after reduction.

[0011] A position signal indicating device for a fully enclosed electric gate valve, characterized in that: the stator coil is wound around the circular portion of part two.

[0012] A position signal indicating device for a fully enclosed electric gate valve is characterized in that: the permanent magnet has a cylindrical structure with alternating symmetrical N and S poles along the radial direction of the stator.

[0013] A position signal indicating device for a fully enclosed electric gate valve, characterized in that: the material of the second part is an iron-cobalt-vanadium alloy.

[0014] A position signal indicating device for a fully enclosed electric gate valve, characterized in that: the screw plug material is an iron-nickel alloy or an iron-cobalt-vanadium alloy.

[0015] A position signal indicating device for a fully enclosed electric gate valve, characterized in that: the materials of the magnetic column and the magnetic disk are iron-nickel alloy or iron-cobalt-vanadium alloy.

[0016] A position signal indicating device for a fully enclosed electric gate valve, characterized in that: the permanent magnet material is samarium cobalt permanent magnet material or aluminum nickel cobalt permanent magnet material.

[0017] Furthermore, the position signal indicating device for a fully enclosed electric gate valve is characterized in that the position signal indicating device is integrated into the electric drive device.

[0018] Furthermore, the position signal indicating device for a fully enclosed electric gate valve is characterized in that: the rotor is the output gear shaft of an electric drive device, and threaded holes are evenly arranged in the circumferential direction of the output gear shaft for fixing the magnetic column.

[0019] Furthermore, the position signal indicating device for a fully enclosed electric gate valve is characterized in that: the permanent magnet has a cylindrical structure, and the N and S poles are alternately and symmetrically distributed in the optical aperture of the stator along the axis of the stator.

[0020] Furthermore, the position signal indicating device for a fully enclosed electric gate valve is characterized in that: the permanent magnet is made of samarium cobalt permanent magnet material, which has high magnetic properties (high remanence, high coercivity and high energy product), preventing the permanent magnet from demagnetizing at high temperatures, and also has excellent temperature characteristics (+300℃~-273℃), excellent oxidation resistance and corrosion resistance.

[0021] Furthermore, the position signal indicating device for a fully enclosed electric gate valve is characterized in that: the magnetic column has a cylindrical structure, and a thread is machined at one end of the magnetic column, which is fixed to the output gear shaft by a threaded connection.

[0022] Furthermore, the position signal indicating device for a fully enclosed electric gate valve is characterized in that: the guide disk has a disc-shaped structure with a light hole at the center, and is fixed to the ball screw by bolt connection.

[0023] Furthermore, the position signal indicating device for a fully enclosed electric gate valve is characterized in that: the screw plug has a cylindrical structure, the outer cylindrical surface is threaded, and it is fixed in the stator hole by means of threaded connection.

[0024] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0025] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims. Attached image description:

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is a structural diagram of the fully enclosed electric gate valve of the present invention;

[0028] Figure 2 This is a cross-sectional view of the position signal indicating device of the present invention;

[0029] Figure 3 This is a graph of the induced voltage signal of the stator coil in this invention;

[0030] The reference numerals in the attached drawings are as follows: 101 is a fully enclosed electric drive device, 1011 is a position signal indicator device, 10111 is a screw plug, 10112 is a permanent magnet, 10113 is a stator (part 1), 10114 is a rotor, 10115 is a magnetic guide column, 10116 is a magnetic guide disk, 10117 is a stator coil, 10118 is a stator (part 2), and 102 is a gate valve. Detailed Implementation

[0031] This invention patent discloses a position signal indicating device for a fully enclosed electric gate valve, characterized in that it includes a stator 10113 (10118), a rotor 10114, a permanent magnet 10112, a magnetic guide column 10115, a magnetic guide disk 10116, a screw plug 10111, a stator coil 10117, etc.

[0032] The position signal indicator 1011 is integrated into the electric drive device. The stator 10113 (10118) is embedded in the base via a clearance fit, and is positioned axially using a shaft elastic retaining ring to prevent axial movement. The stator is assembled from parts 1 and 2. Part 1 has a concentric ring structure, with a thin-walled section machined at a position more than half the diameter of one of the axes, and two symmetrical holes symmetrically opened in the diameter direction at the thin-walled ring for placing permanent magnets. Part 2 has a semi-circular ring structure, with a section of concave inner and outer diameter machined at a symmetrical position at a 90° angle to the center. The rotor is used to wind the stator coils; the output gear shaft of the electric drive device has threaded holes evenly arranged in the circumferential direction of the output gear shaft; the permanent magnet is a cylindrical structure with N and S poles symmetrically distributed alternately along the stator axis in the diameter direction of the stator; the magnetic guide column is a cylindrical structure with threads machined at one end and fixed to the rotor shaft by threaded connection; the magnetic guide disk is a disc structure with a light hole at the center and fixed to the ball screw by bolt connection; the screw plug is a cylindrical structure and fixed in the stator light hole by clearance fit.

[0033] Position signal indication device signal feedback process:

[0034] After the electric drive device is powered on, the magnetic column 10115 fixed on the rotor 10114 of the position signal indicator rotates together with the rotor. At the same time, the ball screw with a guide disk 10116 at one end moves along the axis of the rotor. When the guide disk 10116 approaches the plane where the magnetic column 10115 is located, and the magnetic column 10115 rotates to approach or move away from the permanent magnet, the magnetic flux in the stator magnetic circuit changes abruptly (increases or decreases). This change in magnetic flux is refracted to the waveform of the induced voltage signal output of the stator coil, which is approximately a sine function curve. When the permanent magnet, magnetic column, and guide disk coincide, the magnetic circuit is connected and the voltage signal value is the maximum. Conversely, the voltage signal value gradually decreases. The change in the stator coil voltage signal is output to the control element as a position indication signal during the opening / closing of the valve.

Claims

1. A position signal indicating device for a fully enclosed electric gate valve, comprising a stator, a rotor, a permanent magnet, a magnetic guide column, a magnetic guide disk, a screw plug, and a stator coil; characterized in that: The stator is embedded in the base of the electric drive device and is axially positioned using a shaft elastic retaining ring. The rotor is the output gear shaft of the electric drive device and has a hollow structure. The permanent magnets are distributed in the optical holes of the stator, and the magnetic columns are evenly arranged in the radial plane of the rotor. The magnetic disk moves linearly along the axis of the hollow rotor by a ball screw. The screw plug has a cylindrical structure with threads on the outer cylindrical surface and is fixed in the threaded hole of the stator by a threaded connection. The indication method of the position signal indicating device for the fully enclosed electric gate valve is as follows: After the electric drive device is powered on, the magnetic column fixed on the rotor of the position signal indicating device rotates together with the rotor. At the same time, the ball screw with a guide disk at one end moves along the axis of the rotor. When the guide disk approaches the plane where the magnetic column is located, and the magnetic column rotates to approach or move away from the permanent magnet, the magnetic flux in the stator magnetic circuit changes abruptly. This change in magnetic flux is refracted to the waveform of the induced voltage signal output of the stator coil, which is approximately a sine function curve. When the permanent magnet-magnetic column-guide disk coincide, the magnetic circuit is connected and the voltage signal value is the maximum. Conversely, the voltage signal value gradually decreases. The change in the stator coil voltage signal is output to the control element as a position indication signal during the opening / closing of the valve.

2. The position signal indicating device for a fully enclosed electric gate valve according to claim 1, characterized in that: The stator is assembled from component one and component two; Part 1 is a ring-shaped structure with a rectangular basic cross-section. A through-hole is provided along the radial direction to place a permanent magnet. The ring is cut off at a greater than 180-degree angle on the outer radial side of the ring and on the same side as the axis of the through-hole. The cutting thickness and angle are related to Part 2. Part 2 is a fan-shaped ring structure with an angle greater than 180 degrees. The basic cross-section of the ring is rectangular-circular-rectangular, with the circular part being 90 degrees. The two rectangular segments are symmetrical, and a threaded hole is opened upward to place a screw plug. The rectangular dimensions are the same as the dimensions of Part 1 after reduction.

3. The position signal indicating device for a fully enclosed electric gate valve according to claim 2, characterized in that: The stator coil is wound around the circular portion of part two.

4. The position signal indicating device for a fully enclosed electric gate valve according to claim 3, characterized in that: The permanent magnet has a cylindrical structure with alternating N and S poles symmetrically arranged along the radial direction of the stator.

5. A position signal indicating device for a fully enclosed electric gate valve according to claim 4, characterized in that: The material of part two is an iron-cobalt-vanadium alloy.

6. The position signal indicating device for a fully enclosed electric gate valve according to claim 5, characterized in that: The plug material is an iron-nickel alloy or an iron-cobalt-vanadium alloy.

7. A position signal indicating device for a fully enclosed electric gate valve according to claim 6, characterized in that: The magnetic posts and magnetic disks are made of iron-nickel alloy or iron-cobalt-vanadium alloy.

8. A position signal indicating device for a fully enclosed electric gate valve according to claim 7, characterized in that: The permanent magnet material is samarium cobalt permanent magnet material or aluminum nickel cobalt permanent magnet material.

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