Through-flow turbine oil-supply head displacement measuring device capable of saving installation space

Abstract

The utility model discloses a through-flow turbine oil-supply head displacement measuring device capable of saving installation space, which belongs to the technical field of through-flow turbines, and comprises a main body to be measured and a displacement measuring sensor connected with the main body to be measured, and the displacement measuring sensor is a stay wire type displacement sensor arranged on a shell of the main body to be measured. The stay wire type displacement sensor is connected with the to-be-detected main body after penetrating through the shell of the to-be-detected main body through a steel wire lead; the steel wire lead is parallel to the central axis of the to-be-measured main body, and the axial displacement of the to-be-measured main body drives the steel wire lead to generate the same displacement, so that the stay wire type displacement sensor outputs a measurement signal. According to the utility model, the stay wire type displacement sensor is used as a measuring element, flexible connection is adopted, measurement vibration caused by rigid mechanical friction is avoided, and meanwhile, the axial mounting space of the oil head is also reduced.

Description

Technical Field

[0001] The utility model relates to a displacement measuring device, in particular to a displacement measuring device for a tubular turbine oil receiver that saves installation space. Background Art

[0002] The displacement measurement 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 water turbine. It is one of the necessary measured parameters for a double-regulated tubular turbine.

[0003] In the prior art, the Chinese utility model patent with the publication number CN203570497U discloses an oil receiver feedback device applied to a Kaplan turbine; 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 a 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. The magnetostrictive displacement sensor and its measuring rod are arranged axially in the oil receiver, and the displacement is measured by using the magnetostrictive displacement sensor and the magnetic ring, and a RS485 serial port signal is output. However, the measurement method of the magnetostrictive displacement sensor is a hard connection, which is prone to measurement vibration due to rigid mechanical friction. At the same time, since the magnetostrictive displacement sensor needs to reserve the displacement stroke to be detected during installation, a relatively large installation space is occupied in the axial position of the oil receiver.

[0005] In view of this, the utility model proposes a displacement measuring device for a tubular turbine oil receiver that saves installation space. Summary of the Utility Model

[0006] The utility model aims to solve the problems in the prior art that the displacement monitoring device of the oil receiver uses a rigid connection, which is prone to measurement vibration due to rigid mechanical friction and occupies the axial installation space of the oil receiver. A displacement measuring device for a tubular turbine oil receiver that saves installation space is proposed. A wire-drawing displacement sensor is used as a measuring element, and a flexible connection is adopted, which avoids the measurement vibration caused by rigid mechanical friction and also reduces the axial installation space of the oil receiver.

[0007] In order to achieve the above-mentioned utility model purpose, the technical solution of the utility model is as follows:

[0008] A displacement measuring device for a tubular turbine oil receiver that saves installation space, comprising a main body to be measured and a displacement measuring sensor connected to the main body to be measured. The displacement measuring sensor is a wire-drawing displacement sensor arranged on the outer shell of the main body to be measured. The wire-drawing displacement sensor is connected to the main body to be measured through a steel wire lead after passing through the outer shell of the main body to be measured. The steel wire lead is parallel to the central axis of the main body to be measured. The axial displacement of the main body to be measured drives the steel wire lead to generate the same displacement, so that the wire-drawing displacement sensor outputs a measurement signal.

[0009] Furthermore, a sensor mounting bracket is fixedly arranged on the outer shell of the main body to be measured, and the wire-drawing displacement sensor is detachably and fixedly connected to the sensor mounting bracket.

[0010] Furthermore, mounting holes are arranged on the sensor mounting bracket, and the wire-drawing displacement sensor is fixed on the sensor mounting bracket by bolts, spring washers and flat washers.

[0011] Furthermore, lugs are arranged on the end face of the main body to be measured. One end of the steel wire lead is connected to the lug hole through a hook, and the other end is connected to the lead hook of the wire-drawing displacement sensor through a hook.

[0012] Furthermore, the lead hook of the wire-drawing displacement sensor and the connected steel wire lead are in a tensioned state at the zero stroke position of the oil receiver.

[0013] Furthermore, a round hole allowing the steel wire lead to pass straight through is opened on the outer shell of the main body to be measured.

[0014] Furthermore, the number of the wire-drawing displacement sensors is at least two.

[0015] Furthermore, when the number of the wire-drawing displacement sensors is two, two lugs are arranged on the end face of the main body to be measured corresponding to the two wire-drawing displacement sensors. The plane with holes of the two lugs coincides with the middle plane of the main body to be measured, and the two lugs are symmetric with respect to the neutral plane of the main body to be measured.

[0016] Furthermore, the positions of the leads of the two wire-drawing displacement sensors and the connected steel wire leads are parallel to the central axis of the main body to be measured and coincide with the middle plane of the main body to be measured.

[0017] The working principle of the present utility model is as follows: When the oil receiver shaft undergoes axial displacement, this device undergoes the same displacement as the oil receiver through the steel wire lead. Through the measurement of the wire-drawing displacement sensor, the displacement amount is monitored in real time, and the position of the oil receiver is fed back to the monitoring system in real time to obtain the displacement measurement result of the turbine oil receiver.

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

[0019] 1) The utility model uses a wire-pulling displacement sensor as a measuring element and adopts a flexible connection, which avoids the measuring vibration caused by rigid mechanical friction and reduces the installation space of the oil receiver along the axial direction at the same time;

[0020] 2) The utility model is provided with multiple groups of wire-pulling displacement sensors, which are connected with the oil receiver body through steel wire leads. The axial displacement of the main body to be measured drives the steel wire leads to generate the same displacement, so that the wire-pulling displacement sensors output multiple groups of measurement signals at the same time to improve the credibility of the measurement results. Description of the Drawings

[0021] Figure 1 It is a schematic installation diagram of the displacement measuring device of the present invention and the main body to be measured;

[0022] Figure 2 is Figure 1 side view of;

[0023] In the figure:

[0024] 1. Sensor mounting bracket, 2. Wire-pulling displacement sensor, 3. Steel wire lead, 4. Hanging ear, 5. Oil receiver shaft, 6. Bearing housing, 7. Bearing cover, 8. Oil receiver cover, 9. Oil receiver end cover, 10. Hexagon head full thread bolt, 11. Spring washer, 12. Flat washer. Detailed Embodiment

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0030] Embodiment 1

[0031] As a basic implementation manner of the present utility model, this embodiment provides a displacement measurement device for a tubular turbine oil receiver that saves installation space, including a main body to be measured and a displacement measurement sensor connected to the main body to be measured and measuring its axial displacement. The displacement measurement sensor is a wire-drawing displacement sensor 2 arranged on the outer shell of the main body to be measured. The wire-drawing displacement sensor 2 is connected to the main body to be measured through a steel wire lead 3 after passing through the outer shell of the main body to be measured; the steel wire lead 3 is parallel to the central axis of the main body to be measured, and the axial displacement of the main body to be measured drives the steel wire lead 3 to generate the same displacement, so that the wire-drawing displacement sensor 2 outputs a measurement signal.

[0032] In this embodiment, as Figure 1 shown, the main body to be measured is the oil receiver shaft 5, and the outer shell of the main body to be measured is the oil receiver cover 8. A bearing seat 6 and a bearing cover 7 are connected to the shaft end of the oil receiver shaft 5. The oil receiver shaft 5, the bearing seat 6, and the bearing cover 7 are integrated and are all located inside the oil receiver cover 8. An oil receiver end cover 9 opposite to the bearing cover 7 is provided at the end of the oil receiver cover 8.

[0033] Furthermore, a sensor mounting bracket 1 is fixedly arranged on the oil receiver end cover 9 by welding, and the wire-drawing displacement sensor 2 is fixed on the sensor mounting bracket 1 by bolts. In this embodiment, a φ6 hole is provided on the mounting bracket, and the wire-drawing displacement sensor is fixed on the mounting bracket 1 by an M5×10 hexagon head full-thread bolt, a spring washer, and a flat washer.

[0034] Further, an ear 4 is provided on the bearing cover 7 of the oil receiver shaft 5. One end of the steel wire lead 3 is connected to the ear hole, and the other end of the steel wire lead 3 is connected to the pull-wire displacement sensor 2.

[0035] A round hole allowing the steel wire lead 3 of the pull-wire displacement sensor 2 to pass straight through is provided on the oil receiver end cover 9. The lead hook of the pull-wire displacement sensor 2 is connected to the hook of the steel wire lead 3. After the steel wire lead 3 passes through the φ8 round hole on the oil receiver end cover 9, it is connected to the ear hole with a hook.

[0036] Preferably, at the zero-stroke position of the oil receiver, it is necessary to ensure that the lead of the pull-wire displacement sensor 2 and the steel wire lead 3 are in a tensioned state.

[0037] 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 undergoes the same displacement as the bearing seat 6 through the steel wire lead 3. Through the measurement of the pull-wire displacement sensor 3, the displacement amount is monitored in real time, and the position of the bearing seat 6 is fed back to the monitoring system in real time to obtain the displacement measurement result of the water turbine oil receiver.

[0038] The present utility model uses a pull-wire displacement sensor as a measuring element and adopts a flexible connection, avoiding the measurement vibration caused by rigid mechanical friction. At the same time, due to the detection characteristics of the pull-wire displacement sensor, the installation space required by it is small, thus reducing the installation space of the oil receiver along the axial direction.

[0039] Embodiment 2

[0040] As a preferred implementation manner of the present utility model, a displacement measuring device for a tubular turbine oil receiver that saves installation space in this embodiment includes a main body to be measured and a displacement measuring sensor connected to the main body to be measured and measuring its axial displacement. The displacement measuring sensor is a pull-wire displacement sensor 2 provided on the outer shell of the main body to be measured. The pull-wire displacement sensor 2 is connected to the main body to be measured through a steel wire lead 3 passing through the outer shell of the main body to be measured; the steel wire lead 3 is parallel to the central axis of the main body to be measured, and the axial displacement of the main body to be measured drives the steel wire lead 3 to generate the same displacement, causing the pull-wire displacement sensor 2 to output a measurement signal.

[0041] The main body to be measured and its bearing seat, bearing cover and outer shell structure are the same as those in Embodiment 1.

[0042] In this embodiment, the number of pull-wire displacement sensors 2 is two. Since two sets of pull-wire displacement sensors 2 are arranged in parallel in this device, two sets of measurement signals can be output simultaneously, improving the credibility of the measurement result.

[0043] Two ears 4 are respectively provided on the bearing cover 7 of the oil receiver shaft 5 corresponding to the two pull-wire displacement sensors 2. Preferably, the plane with holes of the two ears 4 coincides with the middle plane of the oil receiver shaft 5 and the two ears 4 are symmetric with respect to the middle plane of the oil receiver shaft 5.

[0044] Two round holes are formed in the oil receiver end cover 9, allowing the steel wire leads 3 of the two wire-drawing displacement sensors 2 to pass straight through.

[0045] Preferably, the positions of the leads of the two wire-drawing displacement sensors 2 and the steel wire leads 3 should be parallel to the central axis of the oil receiver shaft 5 and coincide with the central plane of the oil receiver shaft 5. The installation positions of the two wire-drawing displacement sensors 2 should ensure the above-mentioned positional relationship of the connection.

[0046] It should be noted that considering the installation space and cost, the number of wire-drawing displacement sensors is preferably set to two in this embodiment. In practice, the number of wire-drawing displacement sensors can be extended to three or four according to the same layout principle, as long as it is ensured that the wire is parallel to the central axis of the oil receiver.

[0047] The working principle of the present utility model is as follows: When the bearing seat 6 in the oil receiver undergoes an axial displacement, the steel wire leads 3 of the two wire-drawing displacement sensors 3 in this device undergo the same displacement as the bearing seat 6. The two wire-drawing displacement sensors 3 monitor this displacement amount in real time and simultaneously output two measurement signals to the monitoring system to improve the credibility of the measurement results.

[0048] The above is only a preferred embodiment of the present utility model, and does not impose any form of limitation on the present utility model. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present utility model falls within the protection scope of the present utility model.

Claims

1. A displacement measurement device for a tubular turbine oil receiver that saves installation space, comprising a main body to be measured and a displacement measurement sensor connected to the main body to be measured, characterized in that, The displacement measurement sensor is a wire-drawing displacement sensor (2) arranged on the outer shell of the main body to be measured. The wire-drawing displacement sensor (2) is connected to the main body to be measured through a steel wire lead (3) passing through the outer shell of the main body to be measured; the steel wire lead (3) is parallel to the central axis of the main body to be measured, and the axial displacement of the main body to be measured drives the steel wire lead (3) to generate the same displacement, so that the wire-drawing displacement sensor (2) outputs a measurement signal.

2. The displacement measuring device for the through-flow turbine oil receiver that saves installation space according to claim 1, characterized in that A sensor mounting bracket (1) is fixedly arranged on the outer shell of the main body to be measured, and the wire-drawing displacement sensor (2) is detachably and fixedly connected to the sensor mounting bracket (1).

3. The displacement measuring device for the through-flow turbine oil receiver that saves installation space according to claim 2, wherein Mounting holes are arranged on the sensor mounting bracket (1), and the wire-drawing displacement sensor (2) is fixed on the sensor mounting bracket (1) by bolts, spring washers (11) and flat washers (12).

4. The displacement measuring device for the through-flow turbine oil receiver that saves installation space as described in claim 1, wherein, Lugs (4) are arranged on the end face of the main body to be measured. One end of the steel wire lead (3) is connected to the hole of the lug (4) through a hook, and the other end is connected to the lead hook of the wire-drawing displacement sensor (2) through a hook.

5. The displacement measuring device for a tubular turbine oil receiver that saves installation space according to claim 4, characterized in that The lead hook of the wire-drawing displacement sensor (2) and the connected steel wire lead (3) are in a tensioned state at the zero stroke position of the oil receiver.

6. The displacement measuring device for a tubular turbine oil receiver that saves installation space according to claim 1, characterized in that, A round hole allowing the steel wire lead (3) to pass straight through is formed in the outer shell of the main body to be measured.

7. A displacement measuring device for a tubular turbine oil receiver that saves installation space according to any one of claims 1 to 6, characterized in that The number of the wire-drawing displacement sensors (2) is at least two.

8. The displacement measuring device for the through-flow turbine oil receiver that saves installation space according to claim 7, characterized in that, When the number of the wire-drawing displacement sensors (2) is two, two lugs (4) are arranged on the end face of the main body to be measured corresponding to the two wire-drawing displacement sensors (2). The plane with holes of the two lugs (4) coincides with the middle plane of the main body to be measured and the two lugs (4) are symmetric with respect to the neutral plane of the main body to be measured.

9. The displacement measuring device for the oil receiver of a tubular turbine for saving installation space according to claim 8, characterized in that, The positions of the leads of the two wire-drawing displacement sensors (2) and the connected steel wire leads (3) are parallel to the central axis of the main body to be measured and coincide with the middle plane of the main body to be measured.

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