Through-flow turbine oil head displacement measuring device

Abstract

The utility model discloses a through-flow turbine oil head displacement measuring device, which belongs to the technical field of through-flow turbines and comprises a measuring extension rod connected with a main body to be measured, and the axis direction of the measuring extension rod is parallel to the displacement direction of the main body to be measured. A magnetostriction linear displacement sensor of which the measurement stroke is parallel to the displacement direction of the to-be-measured main body is arranged in the side direction outside the to-be-measured main body; the measurement extension rod is connected with a magnetic sliding block on the magnetostriction linear displacement sensor through a sliding block connecting rod; according to the utility model, the magnetostriction linear displacement sensor is arranged in parallel at the lateral position outside the main body to be measured, so that the mounting space along the axial direction of the oil head is saved, and meanwhile, the displacement of the main body to be measured is synchronously transmitted to the magnetic slide block of the sensor by measuring the extension rod and the slide block connecting rod, so that a more accurate displacement data detection result can be measured.

Description

Technical Field

[0001] The utility model relates to a displacement measuring device, in particular to a displacement measuring device for the oil receiver of a tubular turbine. Background Art

[0002] The measurement of the displacement of the oil receiver actually directly reflects the displacement of the blade servomotor. The blade servomotor is a device that controls the rotation of the runner blades and participates in the hydraulic regulation of the turbine. It is one of the necessary measured parameters for a double-regulated tubular turbine.

[0003] In the prior art, the Chinese invention patent with the publication number CN103590960A discloses an oil receiver feedback device applied to a Kaplan turbine and its installation process; it includes an oil receiver housing and a feedback shaft arranged inside the housing, and also includes a magnetostrictive displacement sensor. A through hole is opened in the middle of the feedback shaft, and the measuring rod of the magnetostrictive displacement sensor is arranged in the through hole. A magnetic ring sleeved on the outer periphery of the measuring rod is fixedly connected to the upper end surface of the feedback shaft, and the main body part of the magnetostrictive displacement sensor is connected to the upper end surface of the housing.

[0004] This comparative patent is applied to a vertical shaft unit, and a magnetostrictive displacement sensor and its measuring rod are arranged axially in the oil receiver. When the axial installation space of the oil receiver is limited, this installation method is no longer applicable. In view of this, the utility model proposes a displacement measuring device for the oil receiver of a tubular turbine that can save the axial installation space of the oil receiver. Summary of the Utility Model

[0005] The utility model aims to solve the problem of limited axial installation space of the oil receiver displacement monitoring device in the prior art, and proposes a displacement measuring device for the oil receiver of a tubular turbine. The magnetostrictive linear displacement sensor is arranged in parallel on the side of the main body to be measured, saving the installation space along the axis of the oil receiver and reducing the installation difficulty.

[0006] In order to achieve the above-mentioned utility model purpose, the technical solution of the utility model is as follows:

[0007] A displacement measuring device for the oil receiver of a tubular turbine includes a measurement extension rod connected to the main body to be measured, and the axis direction of the measurement extension rod is parallel to the displacement direction of the main body to be measured; a magnetostrictive linear displacement sensor with a measurement stroke parallel to the displacement direction of the main body to be measured is arranged on the side of the main body to be measured, and the measurement extension rod is connected to the magnetic slider on the magnetostrictive linear displacement sensor through a slider link.

[0008] Furthermore, the measurement extension rod is detachably and fixedly connected to the end face of the main body to be measured.

[0009] Further, a connection hole is provided on the end face of the subject to be measured, and the connection hole is a threaded hole. One end of the measurement extension rod is connected to the threaded hole by setting an external thread.

[0010] Further, the slider link is detachably and fixedly connected to both the measurement extension rod and the magnetostrictive linear displacement sensor.

[0011] Further, one end of the slider link is connected to the measurement extension rod by a bolt, and the other end is connected to the magnetic slider on the magnetostrictive linear displacement sensor by a screw.

[0012] Further, a stop washer is provided on the threaded connection pair between the slider link and the measurement extension rod.

[0013] Further, the magnetostrictive linear displacement sensor is installed on the outer shell where the subject to be measured is located through a sensor bracket, and the rod body of the measurement extension rod passes through the through hole of the end cover of the outer shell.

[0014] Further, the measurement extension rod is cylindrical, and external hexagons are machined at positions near both ends of the measurement extension rod to stabilize the rod body during installation.

[0015] Further, the sensor bracket is fixed at the lower rib plate of the outer shell of the subject to be measured, and the axis of the magnetostrictive linear displacement sensor body is parallel to the measurement extension rod.

[0016] Further, two magnetostrictive linear displacement sensors are arranged in parallel. The end of the slider link forms two branches, and these two branches are respectively connected to the magnetic sliders on the two magnetostrictive linear displacement sensors.

[0017] The working principle of the present utility model is as follows: When the bearing seat in the oil receiver undergoes an axial displacement, this device undergoes the same displacement as the bearing seat through the measurement extension rod, the slider link, and the magnetic slider of the magnetostrictive linear displacement sensor. Through the measurement of the magnetostrictive linear displacement sensor, the displacement amount is monitored in real time, that is, the position of the bearing seat is fed back to the monitoring system in real time.

[0018] In summary, the present utility model has the following advantages:

[0019] 1) The present utility model arranges the magnetostrictive linear displacement sensors in parallel on the side of the outside of the subject to be measured, so as to save the installation space along the axial direction of the oil receiver and reduce the installation difficulty; at the same time, through the measurement extension rod and the slider link, the displacement amount of the subject to be measured is synchronously transmitted to the magnetic slider of the sensor, and relatively accurate displacement data detection results can be obtained;

[0020] 2) In the present utility model, the displacement measurement device uses rigid connection measurement, which improves the response rate of the measurement signal;

[0021] 3) The utility model adopts dual sensors for measurement, increasing the output quantity of measurement signals and further improving measurement accuracy. Description of the Drawings

[0022] Figure 1 is Figure 2 the sectional view taken along the A direction of

[0023] Figure 2 is Figure 1 the axial end view of

[0024] In the figures:

[0025] 1. Measuring extension rod, 2. Slide block connecting rod, 3. Magnetostrictive linear displacement sensor, 4. Magnetic slide block

[0026] 5. Sensor bracket, 6. Bearing housing, 7. Bearing cover, 8. Oil receiver cover, 9. Oil receiver end cover. Detailed Embodiment

[0027] To describe the utility model more clearly, the following further explains the utility model in combination with preferred embodiments and the drawings. Those skilled in the art should understand that the following specific description is illustrative rather than restrictive, and should not be used to limit the protection scope of the utility model.

[0028] Embodiment 1

[0029] The utility model provides a displacement measuring device for a tubular turbine oil receiver, as Figure 1 shown, which includes a measuring extension rod 1 connected to the main body to be measured, and the axis direction of the measuring extension rod 1 is parallel to the displacement direction of the main body to be measured; a magnetostrictive linear displacement sensor 3 with a measuring stroke parallel to the displacement direction of the main body to be measured is arranged laterally outside the main body to be measured, and the measuring extension rod 1 is connected to the magnetic slide block 4 on the magnetostrictive linear displacement sensor 3 through a slide block connecting rod 2. The displacement of the main body to be measured is synchronously transmitted to the magnetic slide block 4 through the measuring extension rod 1 and the slide block connecting rod 2, thereby measuring the displacement.

[0030] In this embodiment, the main body to be measured is the oil receiver shaft, and the oil receiver shaft is installed in a housing (i.e., the oil receiver cover 8), and one end of the oil receiver cover 8 is the oil receiver end cover 9. As Figure 1 shown, a bearing housing 6 and a bearing cover 7 are arranged at the end of the oil receiver shaft, and the measuring extension rod 1 is detachably and fixedly connected to the end face of the bearing cover 7.

[0031] Preferably, in this embodiment, a connection hole is opened at the center of the end face of the bearing cover 7, and the connection hole is a threaded hole, and an external thread is provided at one end of the measuring extension rod 1 to be installed at this threaded hole.

[0032] In this embodiment, a through hole is provided at the oil receiver end cover 9. The rod body of the measuring extension rod 1 passes through this through hole. The other end of the measuring extension rod 1 is connected to one end of the slider link 2 by bolts. The other end of the slider link 2 is connected to the magnetic slider 4 of the magnetostrictive linear displacement sensor 3 by screws.

[0033] It should be noted that when selecting the length of the measuring extension rod 1, it should be ensured that when the oil receiver bearing seat 6 is at the axial displacement limit, the slider link 2 and the oil receiver end cover 9 do not interfere with each other in position.

[0034] Preferably, the measuring extension rod 1 is cylindrical, and external hexagons are machined at positions near both ends to stabilize the rod body during installation.

[0035] Preferably, one end of the measuring extension rod 1 is machined with an M12 external thread, which is thread - connected with the M12 internal thread hole at the center of the bearing cover 7. The rod body of the measuring extension rod 1 passes through the through hole of the oil receiver end cover 9. To ensure that the measuring extension rod 1 can move freely along the axis, the diameter of the through hole in the end cover should be 1 mm larger than the outer diameter of the measuring extension rod 1. The other end of the measuring extension rod 1 is machined with an M6 internal thread hole. An M6×35 hexagon head full - thread bolt is used to pass through the φ6.5 through hole of the slider link 2 and is thread - connected with the M6 internal thread hole of the measuring extension rod 1. To prevent the thread connection from loosening due to vibration, a lock washer should be used for this thread connection pair.

[0036] In this embodiment, the magnetostrictive linear displacement sensor 3 is welded and fixed on the rib plate outside the oil receiver cover 8 through the sensor bracket 5. Preferably, the sensor bracket 5 is welded and fixed at the lower rib plate of the oil receiver. In the vertical direction, the position should ensure that the axis of the magnetostrictive linear displacement sensor 3 body is parallel to the measuring extension rod 1, and the distance between the magnetostrictive linear displacement sensor 3 body and the magnetic slider 4 meets the sensor measurement gap requirement; in the horizontal direction, the position should ensure that the magnetic slider 4, through its connection with the slider link 2 and the measuring extension rod 1, is completely within the effective measurement range of the sensor when the oil receiver bearing seat 6 is at the axial displacement limit.

[0037] In this embodiment, the magnetostrictive linear displacement sensor 3 body is installed and fixed at the M5 internal thread hole of the sensor bracket 5 using M5×35 socket head cap screws.

[0038] The working principle of the present utility model is as follows: When the bearing seat 6 in the oil receiver undergoes an axial displacement, this device, through the measuring extension rod 1, the slider link 2, and the magnetic slider 4 of the magnetostrictive linear displacement sensor 3, undergoes the same displacement as the bearing seat 6. Through the measurement of the magnetostrictive linear displacement sensor 3, the displacement amount is monitored in real time, that is, the position of the bearing seat 6 is fed back to the monitoring system in real time.

[0039] The installation process of the present utility model is as follows:

[0040] Step 1: Install the measuring extension rod 1 at the threaded hole of the bearing cover 7, and use thread locking adhesive to assist in fastening if necessary.

[0041] Step 2: Pass the measuring extension rod 1 through the central hole of the oil receiver end cover 9, and install the oil receiver end cover 9 at the end of the oil receiver.

[0042] Step 3: Install the slider link 2 at the outer end of the measuring extension rod 1. The connecting section position of the slider link 2 should be perpendicular to the bottom surface.

[0043] Step 4: Install the magnetic slider 4 of the magnetostrictive linear displacement sensor 3 at the branched end of the slider link 2. The position of the magnetic slider 4 should be horizontal.

[0044] Step 5: Install the magnetostrictive linear displacement sensor 3 body on the sensor bracket 5. There should be no relative displacement after fixation.

[0045] Step 6: Determine the installation position of the combination of the magnetostrictive linear displacement sensor 3 and the sensor bracket 5 at the outer rib plate of the oil receiver. In the vertical direction, it should be ensured that the axis of the magnetostrictive linear displacement sensor 3 body is parallel to the measuring extension rod 1, and the gap between the magnetostrictive linear displacement sensor 3 body and the magnetic slider 4 meets the measurement requirements. In the horizontal direction, it should be ensured that the magnetic slider 4 is located within the effective range of the sensor when the oil receiver bearing seat 6 reaches the axial displacement limit through the connection with the slider link 2 and the measuring extension rod 1.

[0046] Step 7: At the determined installation position, weld the combination of the magnetostrictive linear displacement sensor 3 and the sensor bracket 5 to the outer rib plate of the oil receiver through the sensor bracket 5.

[0047] Embodiment 2

[0048] This embodiment provides a displacement measuring device for a tubular turbine oil receiver. Based on all the contents of Embodiment 1, further, there are the following differences from Embodiment 1:

[0049] In this embodiment, reference can be made to Figure 1 As shown, two magnetostrictive linear displacement sensors 3 are arranged in parallel. The end of the slider link 2 forms two branches, and there are M4 threaded holes on the branch end faces. Use M4×30 socket head cap screws to connect the magnetic sliders 4 of the two magnetostrictive linear displacement sensors 3 to the two branches. Preferably, the two branches at the end of the slider link 2 are symmetric about the main plane of the slider link 2, as Figure 2 shown.

[0050] In this embodiment, by setting double sensors for measurement, the number of output measurement signals is increased, and the measurement accuracy is further improved.

[0051] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present utility model all fall within the protection scope of the present utility model.

Claims

1. A displacement measuring device for a bulb turbine oil receiver, characterized in that It includes a measurement extension rod (1) connected to the subject to be measured, and the axis direction of the measurement extension rod (1) is parallel to the displacement direction of the subject to be measured; a magnetostrictive linear displacement sensor (3) with a measurement stroke parallel to the displacement direction of the subject to be measured is arranged laterally outside the subject to be measured, and the measurement extension rod (1) is connected to the magnetic slider (4) on the magnetostrictive linear displacement sensor (3) through a slider link (2).

2. The displacement measuring device for the oil receiver of a tubular turbine according to claim 1, wherein The measurement extension rod (1) is detachably and fixedly connected to the end face of the subject to be measured.

3. The displacement measuring device for a tubular turbine oil receiver according to claim 2, characterized in that, A connection hole is formed in the end face of the subject to be measured, and the connection hole is a threaded hole. One end of the measurement extension rod (1) is connected to the threaded hole by providing an external thread.

4. The displacement measuring device for the oil receiver of a tubular turbine according to claim 1, characterized in that, The slider link (2) is detachably and fixedly connected to both the measurement extension rod (1) and the magnetostrictive linear displacement sensor (3).

5. The displacement measuring device for the oil receiver of a tubular turbine according to claim 4, characterized in that, One end of the slider link (2) is connected to the measurement extension rod (1) by a bolt, and the other end is connected to the magnetic slider (4) on the magnetostrictive linear displacement sensor (3) by a screw.

6. The displacement measuring device for the oil receiver of a tubular turbine according to claim 5, characterized in that, A stop washer is provided on the thread connection pair of the slider link (2) and the measurement extension rod (1).

7. The displacement measuring device for a tubular turbine oil receiver according to claim 1, characterized in that The magnetostrictive linear displacement sensor (3) is installed on the housing where the subject to be measured is located through a sensor bracket (5), and the rod body of the measurement extension rod (1) passes through the through hole of the housing end cover.

8. The displacement measuring device for the oil receiver of a tubular turbine according to claim 1, wherein, The measurement extension rod (1) is cylindrical, and external hexagons are machined at positions near both ends of the measurement extension rod (1) to stabilize the rod body during installation.

9. The displacement measuring device for the oil receiver of a tubular turbine according to claim 7, wherein The sensor bracket (5) is fixed at the lower rib plate of the housing of the subject to be measured, and the axis of the magnetostrictive linear displacement sensor (3) body is parallel to the measurement extension rod (1).

10. A displacement measuring device for a tubular turbine oil receiver according to any one of claims 1 to 9, characterized in that, Two magnetostrictive linear displacement sensors (3) are arranged in parallel. The end of the slider link (2) forms two branches, and these two branches are respectively connected to the magnetic sliders (4) on the two magnetostrictive linear displacement sensors (3).

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