Novel valve rod displacement measuring equipment

Abstract

The utility model discloses a novel valve rod displacement measuring device, which is characterized by comprising a magnetostrictive sensor, the magnetostrictive sensor comprises a stainless steel pressure outer pipe and a magnetic ring, and the stainless steel pressure outer pipe passes through the magnetic ring; the valve rod is provided with counter bores communicated with the stainless steel pressure outer pipe and the magnetic ring, the magnetic ring is fixedly connected with the valve rod, and the joint of the magnetostriction sensor and the valve rod is sealed through a sealing ring; the valve rod is installed in the hydraulic servo-motor, the stainless steel pressure outer pipe and the magnetic ring penetrate through the bottom of the hydraulic servo-motor, and the joint of the valve rod and the hydraulic servo-motor and the joint of the magnetostriction sensor and the hydraulic servo-motor are sealed through sealing rings. The utility model relates to the technical field of measurement, in particular to novel valve rod displacement measuring equipment. The technical problem to be solved by the utility model is to provide a novel valve rod displacement measuring device which is beneficial for realizing valve rod displacement measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to a novel valve stem displacement measuring device. Background Art

[0002] The steam turbine motor is controlled by oil pressure and is a key mechanical component that determines the opening of the turbine valve. Its stroke is a key monitoring item for the safe operation of the steam turbine. The existing method of monitoring the stroke of the motor is to use an LVDT sensor installed outside the motor. The valve stem drives the LVDT core rod up and down through the connecting rod to measure and transmit the valve position stroke. Figure 7 shown.

[0003] The throttle opening of the steam turbine oil motor is controlled by LVDT sensor measurement, which takes up a large installation space. Moreover, since it is installed outside the oil motor, its measurement accuracy is easily affected by other external factors (such as vibration, bumps, etc.), which in turn affects the safe operation of the steam turbine. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a novel valve stem displacement measuring device, which is conducive to realizing valve stem displacement measurement.

[0005] The utility model adopts the following technical solutions to achieve the purpose of the invention:

[0006] A new valve stem displacement measurement device is characterized by comprising: a magnetostrictive sensor comprising a stainless steel outer pressure tube and a magnetic ring, through which the stainless steel outer pressure tube passes; a valve stem, provided with a countersunk hole for the stainless steel outer pressure tube and the magnetic ring, the magnetic ring being fixedly connected to the valve stem, and a sealing ring sealing the connection between the magnetostrictive sensor and the valve stem; and an oil motor, the valve stem being installed within the oil motor, the stainless steel outer pressure tube and the magnetic ring passing through the bottom of the oil motor, and a sealing ring sealing the connection between the valve stem, the magnetostrictive sensor, and the oil motor. This device changes the existing sensor installation method, resolving issues such as large installation space and susceptibility to measurement fluctuations. This improves measurement accuracy and ensures proper steam turbine safety monitoring.

[0007] As a further limitation of the present technical solution, the magnetostrictive sensor is fixedly connected to the bottom of the hydraulic motor by bolts.

[0008] As a further limitation of this technical solution, the bottom of the hydraulic motor is fixedly connected to a circular cover. The circular ring plate of the circular cover is provided with a set of cross slots, each of which is provided with a cross block. Each cross block is fixedly connected to a rod. The magnetostrictive sensor is fixedly connected to a mounting base, which is provided with a set of sockets, with one set of rods matching the other set of sockets. The use of the rods and sockets to connect the magnetostrictive sensor allows for quick installation and convenient assembly and disassembly.

[0009] As a further limitation of this technical solution, the end of the plug rod adopts an arc transition, and the plug rod is made of rubber material. The arc transition facilitates the insertion of the plug rod into the socket, and the plug rod is made of rubber material to achieve deformation of the plug rod, thereby achieving stable installation of the magnetostrictive sensor.

[0010] As a further limitation of this technical solution, the circular cover is fixedly connected to the circular ring, which is rotatably connected to the power ring. The power ring is provided with a set of evenly distributed oblique slots, and each of the cross blocks is fixedly connected to a power circular block, each of which is respectively positioned within a corresponding oblique slot. By using the power ring and positioning the power circular blocks within the oblique slots, a group of plungers can be synchronized when the power ring rotates.

[0011] As a further limitation of the present technical solution, the circle is provided with a first mark, and the mounting base is provided with a second mark, so as to facilitate the installation of the magnetostrictive sensor.

[0012] As a further limitation of the present technical solution, the power ring is threadedly connected to a bolt, the circular cover is provided with a threaded hole, the bolt matches the threaded hole, and the bolt is tightened into the threaded hole to fix the power ring.

[0013] Compared with related technologies, the new valve stem displacement measuring device provided by the present invention has the following beneficial effects:

[0014] (1) Change the existing sensor installation method to solve the problems of large installation space and easy measurement impact. Improve measurement accuracy and ensure the normal operation of steam turbine safety monitoring;

[0015] (2) The magnetostrictive sensor is installed at the bottom of the oil motor. The stainless steel pressure outer tube and the magnetic ring are inserted into the valve stem. The magnetic ring can move up and down with the valve stem. The valve stem stroke is measured and transmitted;

[0016] (3) By using an insert rod and a mounting base, the insert rod is inserted into the socket, thereby facilitating the installation of the magnetostrictive sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation of the present utility model.

[0018] Figure 2This is a schematic diagram of the partial three-dimensional structure of the utility model Figure 1 .

[0019] Figure 3 This is a schematic diagram of the partial three-dimensional structure of the utility model Figure 2 .

[0020] Figure 4 This is a schematic diagram of the partial three-dimensional structure of the utility model Figure 3 .

[0021] Figure 5 This is a schematic diagram of the partial three-dimensional structure of the utility model Figure 4 .

[0022] Figure 6 This is a schematic diagram of the three-dimensional structure of the magnetostrictive sensor of the present utility model.

[0023] Figure 7 For existing measurement methods.

[0024] In the figure: 1. Valve stem, 2. Oil motor, 3. Magnetostrictive sensor, 4. Stainless steel pressure outer tube, 5. Magnetic ring, 6. Round cover, 7. Power ring, 8. Bevel groove, 9. Cross groove, 10. Bolt, 11. Insert rod, 12. Mounting seat, 13. Second mark, 14. First mark, 15. Socket, 16. Circle, 17. Threaded hole, 18. Power round block, 19. Cross block. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0026] A novel valve stem displacement measurement device includes: a magnetostrictive sensor 3 comprising a stainless steel outer pressure tube 4 and a magnetic ring 5, through which the stainless steel outer pressure tube 4 passes; a valve stem 1, provided with a countersunk hole for the stainless steel outer pressure tube 4 and the magnetic ring 5, which is fixedly connected to the valve stem 1; and a sealing ring at the connection between the magnetostrictive sensor 3 and the valve stem 1; and a hydraulic motor 2, within which the valve stem 1 is installed, with the stainless steel outer pressure tube 4 and the magnetic ring 5 passing through the bottom of the hydraulic motor 2. The connection between the valve stem 1, the magnetostrictive sensor 3, and the hydraulic motor 2 is sealed with a sealing ring. This device changes the existing sensor installation method, resolving issues such as large installation space and susceptibility to measurement distortion. This improves measurement accuracy and ensures proper steam turbine safety monitoring.

[0027] Embodiment 1: The magnetostrictive sensor 3 is fixedly connected to the bottom of the hydraulic motor 2 by bolts.

[0028] The working principle of a new valve stem displacement measuring device provided by the utility model is as follows:

[0029] The magnetostrictive sensor 3 is installed at the bottom of the oil motor 2. The stainless steel pressure outer tube 4 and the magnetic ring 5 are inserted into the valve stem 1. The magnetic ring 5 can move up and down with the valve stem 1. The stroke of the valve stem 1 is measured and transmitted.

[0030] Example 2: This example further elaborates on Example 1. The bottom of the hydraulic motor 2 is fixedly connected to a circular cover 6. The circular ring plate of the circular cover 6 is provided with a set of cross slots 9. Each cross slot 9 is provided with a cross block 19. Each cross block 19 is fixedly connected to a rod 11. The magnetostrictive sensor 3 is fixedly connected to a mounting base 12. The mounting base 12 is provided with a set of sockets 15. A set of rods 11 matches a set of sockets 15. By connecting the rods 11 with the sockets 15, the magnetostrictive sensor 3 can be quickly installed and easily disassembled.

[0031] The end of the plug rod 11 is made of a rubber material and has an arc transition, which facilitates the insertion of the plug rod 11 into the jack 15 . The plug rod 11 is made of a rubber material and deforms, thereby achieving stable installation of the magnetostrictive sensor 3 .

[0032] The circular cover 6 is fixedly connected to the circle 16, and the circle 16 is rotatably connected to the power ring 7. The power ring 7 is provided with a set of evenly distributed inclined slots 8. Each of the cross blocks 19 is fixedly connected to a power round block 18, and each of the power round blocks 18 is respectively disposed in a corresponding inclined slot 8. By adopting the power ring 7 and arranging the power round blocks 18 in the inclined slots 8, a set of plug rods 11 can be synchronously moved when the power ring 7 rotates.

[0033] The circle 16 is provided with a first mark 14 , and the mounting base 12 is provided with a second mark 13 , so as to facilitate the installation of the magnetostrictive sensor 3 .

[0034] The power ring 7 is threadedly connected to the bolt 10, and the round cover 6 is provided with a threaded hole 17, and the bolt 10 matches the threaded hole 17. The bolt 10 is tightened into the threaded hole 17 to fix the power ring 7.

[0035] The working principle of a new valve stem displacement measuring device provided by the utility model is as follows:

[0036] Insert the stainless steel outer pressure tube 4 and the magnetic ring 5 into the valve stem 1 so that the second mark 13 is aligned with the first mark 14 .

[0037] The power ring 7 is rotated, and the power ring 7 drives the power round block 18 to move along the inclined groove 8. The power round block 18 drives the cross block 19 to move along the cross groove 9. The cross block 19 drives the insertion rod 11 to move and insert it into the socket 15, thereby realizing the installation of the magnetostrictive sensor 3.

[0038] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A new valve stem displacement measuring device, characterized in that: include: A magnetostrictive sensor (3), the magnetostrictive sensor (3) comprising a stainless steel outer pressure tube (4) and a magnetic ring (5), the stainless steel outer pressure tube (4) passing through the magnetic ring (5); A valve stem (1), wherein the valve stem (1) is provided with a countersunk hole connected to the stainless steel pressure outer tube (4) and the magnetic ring (5), the magnetic ring (5) is fixedly connected to the valve stem (1), and a sealing ring is used to seal the connection between the magnetostrictive sensor (3) and the valve stem (1); The oil motor (2) is provided with a valve stem (1) installed in the oil motor (2), the stainless steel outer pressure tube (4) and the magnetic ring (5) pass through the bottom of the oil motor (2), and the connection between the valve stem (1) and the magnetostrictive sensor (3) and the oil motor (2) is sealed with a sealing ring.

2. The novel valve stem displacement measuring device according to claim 1 is characterized in that: The magnetostrictive sensor (3) is fixedly connected to the bottom of the oil motor (2) via bolts.

3. The new valve stem displacement measuring device according to claim 1 is characterized in that: The bottom of the oil motor (2) is fixedly connected to a circular cover (6); a circular ring plate of the circular cover (6) is provided with a group of cross slots (9); a cross block (19) is provided in each cross slot (9); each cross block (19) is fixedly connected to a plug rod (11); the magnetostrictive sensor (3) is fixedly connected to a mounting seat (12); the mounting seat (12) is provided with a group of jacks (15); a group of the plug rods (11) matches a group of the jacks (15).

4. The novel valve stem displacement measuring device according to claim 3 is characterized in that: The end of the insertion rod (11) adopts an arc transition, and the insertion rod (11) is made of rubber material.

5. The novel valve stem displacement measuring device according to claim 3 is characterized in that: The circular cover (6) is fixedly connected to the circle (16), and the circle (16) is rotatably connected to the power ring (7). The power ring (7) is provided with a group of evenly distributed inclined grooves (8). Each of the cross blocks (19) is respectively fixedly connected to the power circular block (18), and each of the power circular blocks (18) is respectively arranged in the corresponding inclined groove (8).

6. The novel valve stem displacement measuring device according to claim 5 is characterized in that: The circle (16) is provided with a first mark (14), and the mounting seat (12) is provided with a second mark (13).

7. The novel valve stem displacement measuring device according to claim 5 is characterized in that: The power ring (7) is threadedly connected to a bolt (10), the circular cover (6) is provided with a threaded hole (17), and the bolt (10) matches the threaded hole (17).

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