Special displacement monitoring expansion joint for water conservancy and hydropower industry

Abstract

The utility model discloses a special displacement monitoring expansion joint for the water conservancy and hydropower industry, which relates to the technical field of intelligent industrial pipelines and comprises a left-end connecting pipe, a left-end corrugated pipe, a middle connecting pipe, a right-end corrugated pipe and a right-end connecting pipe which are sequentially fixed together, and a stay wire type displacement sensor is mounted in the middle of the outer wall of the left-end connecting pipe; according to the special displacement monitoring expansion joint for the water conservancy and hydropower industry provided by the utility model, when the left end connecting pipe or the right end connecting pipe generates transverse displacement or obliquely rotates, the stay wire type displacement sensor is used for carrying out displacement monitoring on the expansion joint; therefore, the defect of monitoring data missing caused by the fact that the laser sensor cannot receive the reflected light signals is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent industrial pipelines, and in particular to a special displacement monitoring expansion joint for water conservancy and hydropower industries. Background Art

[0002] It is well known that in the water conservancy and hydropower industry, expansion joints are mainly used to compensate for changes in the axial and lateral displacement of pipelines caused by temperature changes, changes in geological conditions, changes in pressure, etc., to prevent the pipeline system from failing due to temperature changes, changes in geological conditions or changes in pressure. Therefore, the displacement monitoring of expansion joints has always been a state monitoring indicator that the water conservancy and hydropower industry pays great attention to. It is of great significance for real-time grasping and judging the operation of the on-site pipeline system. In the prior art, laser displacement sensors are generally used to monitor the displacement changes of expansion joints. This detection method can convert the light signal reflected by the reflector installed on the end pipe into an electrical signal, which is then processed by a processing circuit to obtain the corresponding displacement change value.

[0003] For example, the patent with the authorization announcement number CN215676940U and the authorization announcement date of January 28, 2022, and the name of the patent entitled "A device for monitoring the expansion and contraction of a telescopic joint of a GIS equipment", includes a displacement measuring device, one end of which is connected to one end of the telescopic joint through a first fixing seat, and the other end of which is connected to the other end of the telescopic joint through a second fixing seat; the first fixing seat includes a first clamp connected to one end of the telescopic joint, and one end of the displacement measuring device is fixedly connected to the first clamp through a first limiting mechanism; the second fixing seat includes a second clamp connected to the other end of the telescopic joint, and the other end of the displacement measuring device is fixedly connected to the second clamp through a second limiting mechanism. The device installs a displacement measuring device on the telescopic joint, and connects the two ends of the displacement measuring device to the two ends of the telescopic joint through the clamps, respectively, so that the two ends of the displacement measuring device are synchronously extended and contracted with the extension and contraction of the telescopic joint, thereby realizing the monitoring of the expansion and contraction of the telescopic joint, and effectively improves the measurement precision and accuracy while reducing the labor cost and manual measurement errors.

[0004] The shortcoming of the existing technology is that when the lateral displacement compensation of the expansion joint is large or the pipe system is in an inclined position, the end pipe and the reflector plate also move accordingly, which is very likely to cause the laser signal emitted by the laser sensor to fail to contact the reflector plate, and the reflected laser signal will not be obtained, resulting in the laser sensor failing to receive the reflected signal and resulting in missing monitoring data. Utility Model Content

[0005] The utility model aims to provide a displacement monitoring expansion joint specially used in water conservancy and hydropower industry, so as to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, comprising a left-end connecting pipe, a left-end bellows, an intermediate connecting pipe, a right-end bellows and a right-end connecting pipe that are fixedly connected together in sequence.

[0008] A wire-pulling displacement sensor is installed at the middle position of the outer wall of the left-end connecting pipe.

[0009] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, an inclination sensor is installed at the middle position of the outer wall of the intermediate connecting pipe.

[0010] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, it further includes a self-power generation device, which is connected to the inside of the left-end connecting pipe through a flange, and the self-power generation device is used to supply power to the inclination sensor and the wire-pulling displacement sensor.

[0011] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, both the inclination sensor and the wire-pulling displacement sensor are MEMS sensors.

[0012] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, both the inclination and displacement sensors use the NB-IOT method to transmit data.

[0013] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, the wire-pulling displacement sensor includes an optical encoder fixed on the outer wall of the left-end connecting pipe. A spring recovery mechanism is connected to the optical encoder, and a pull rope is wound around the spring recovery mechanism. A connecting block is formed on the outer wall of the right-end connecting pipe, and the movable end of the pull rope is fixed to the connecting block; when the pull rope is pulled out or retracted, the optical encoder measures the movement amount of the pull rope, thereby providing displacement information.

[0014] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, the self-power generation device uses the moving fluid in the pipeline for self-power generation to supply power to the inclination sensor and the wire-pulling displacement sensor.

[0015] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, the self-power generation device includes an impeller mechanism, a generator and a battery module. The impeller mechanism is installed inside the left-end connecting pipe. The impeller mechanism is used to absorb the kinetic energy of the fluid and transfer it to the coaxial rotating generator. The generator supplies the generated electric energy to the battery module, and the battery module is used to store electric energy, and the inclination sensor and the wire-pulling displacement sensor are powered through the battery module.

[0016] For the above-mentioned displacement monitoring expansion joint dedicated to the water conservancy and hydropower industry, it further includes a sealing box detachably installed inside the left-end connecting pipe, and the self-power generation device is arranged inside the sealing box.

[0017] The above-mentioned displacement monitoring expansion joint for the water conservancy and hydropower industry also includes a terminal display device, which is electrically connected to the inclination sensor, and the terminal display device is also electrically connected to the pull-wire displacement sensor.

[0018] In the above technical scheme, the utility model provides a special displacement monitoring expansion joint for the water conservancy and hydropower industry. When the left end connecting pipe or the right end connecting pipe is laterally displaced or tilted, the expansion joint is monitored for displacement using a pull-wire displacement sensor, thereby avoiding the deficiency of the laser sensor causing the loss of monitoring data due to the failure to receive the reflected light signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic structural diagram of a displacement monitoring expansion joint for use in the water conservancy and hydropower industries provided in one embodiment of the utility model.

[0021] Figure 2 A schematic structural diagram of a displacement monitoring expansion joint in a tilted state for use in the water conservancy and hydropower industries according to an embodiment of the utility model.

[0022] Figure 3 A schematic diagram of a self-generating device for a displacement monitoring expansion joint specially used in the water conservancy and hydropower industry provided by an embodiment of the utility model.

[0023] Figure 4 A side view of a displacement monitoring expansion joint for use in the water conservancy and hydropower industries provided in another embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Left end connecting pipe; 2. Left end bellows; 3. Middle connecting pipe; 4. Inclination sensor; 5. Right end bellows; 6. Right end connecting pipe; 7. Self-generating device; 8. Pull-wire displacement sensor; 81. Rotary encoder; 82. Pull rope; 83. Connecting block; 84. Support frame; 85. Shock-absorbing spring; 86. Bolt; 9. Terminal display device. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] likeFigures 1-4 As shown in Figures 1-4 , a special displacement monitoring expansion joint for the water conservancy and hydropower industry provided by an embodiment of the present utility model includes a left-end connecting pipe 1, a left-end bellows 2, an intermediate connecting pipe 3, a right-end bellows 5, and a right-end connecting pipe 6 that are fixedly connected together in sequence. A wire-drawing displacement sensor 8 is installed at the middle position of the outer wall of the left-end connecting pipe 1.

[0028] Specifically, in this embodiment, the left-end connecting pipe 1, the left-end bellows 2, the intermediate connecting pipe 3, the right-end bellows 5, and the right-end connecting pipe 6 are fixedly connected together in sequence from left to right to form an integral expansion joint (hereinafter referred to as this integral as the expansion joint). The expansion joint is used to pass fluids and compensate for axial and lateral displacement changes of the pipeline. In the initial state, the expansion joint is horizontally arranged. The expansion joint is usually buried underground and connected between two pipelines. The left-end connecting pipe 1 is connected to one pipeline, and the right-end bellows 5 is connected to another pipeline. Both the left-end bellows 2 and the right-end bellows 5 are used to compensate for axial and lateral displacement changes of the pipeline. The intermediate connecting pipe 3 is used to connect the left-end bellows 2 and the right-end bellows 5. In this embodiment, the left-end bellows 2 and the right-end bellows 5 (collectively referred to as bellows) are provided to better perform compensation and deformation. The wire-drawing displacement sensor 8 is used to measure the displacement change of the expansion joint in the linear direction. The wire-drawing displacement sensor 8 is a prior art, and its installation method is simple and the measurement range is large, so no more details will be described here. When the left-end connecting pipe 1, the right-end connecting pipe 6, or both simultaneously have excessive lateral displacement or are in an inclined rotation, the wire-drawing displacement sensor 8 is used to monitor the displacement of the expansion joint, thereby avoiding the deficiency that the laser sensor fails to receive the reflected optical signal and causes missing monitoring data.

[0029] In another embodiment provided by the present utility model, an inclination sensor 4 is installed at the middle position of the outer wall of the intermediate connecting pipe 3. The inclination sensor 4 is used to detect the angle change of the expansion joint. The inclination sensor 4 is a prior art, and no more details will be described here.

[0030] Specifically, the method for monitoring using the above-mentioned special displacement monitoring expansion joint for the water conservancy and hydropower industry includes the following steps:

[0031] Set the target axial displacement as ΔL. When initially installed, the wire-drawing displacement sensor 8 measures the axial displacement value as L. When the pipeline is operating, the wire-drawing displacement sensor 8 measures the axial displacement value as L1, and the inclination sensor 4 measures the value as θ. By comparing the value of |L1cosθ - L| with ΔL, when |L1cosθ - L| > ΔL, it indicates that the axial displacement of the expansion joint has exceeded the target value at this time. The monitoring platform prompts an alarm to remind the on-site operation and maintenance personnel to check the expansion joint at this location;

[0032] Set the target lateral displacement as Δy. When the pipeline is operating, the axial displacement value measured by the wire-drawing displacement sensor 8 is L1, and the measured value of the inclination sensor 4 is θ. By comparing the values of |L1sinθ| and Δy, when |L1sinθ| > Δy, it indicates that the lateral displacement of the expansion joint has exceeded the target value at this time. The monitoring platform gives an alarm to remind the on-site operation and maintenance personnel to check the expansion joint at this place to avoid damage caused by the long-term operation of the expansion joint under overload.

[0033] In another embodiment provided by the present invention, refer to Figure 3 , it further includes a self-power generation device 7. The self-power generation device 7 is connected to the inside of the left-end connecting pipe 1 through a flange, which is convenient for subsequent inspection, maintenance, etc. of the power generation device. The self-power generation device 7 is used to supply power to the inclination sensor 4 and the wire-drawing displacement sensor 8. The self-power generation device 7 is considered because the traditional sensor power supply uses a battery for power supply, and it is necessary to go to the site multiple times later to disassemble and replace the battery of the sensor, which will reduce the service life of the sensor; the self-power generation device 7 uses the moving fluid in the pipeline (that is, the expansion joint) to generate electricity by itself to supply power to the inclination sensor 4 and the wire-drawing displacement sensor 8; the self-power generation device 7 includes an impeller mechanism, a generator and a battery module. The impeller mechanism is installed inside the left-end connecting pipe 1. The impeller mechanism is used to absorb the kinetic energy of the fluid and transfer it to the coaxial rotating generator. The generator supplies the generated electric energy to the battery module. The battery module is electrically connected to the inclination sensor 4 and the wire-drawing displacement sensor 8 respectively. The battery module is used to store electric energy and supply power to the inclination sensor 4 and the wire-drawing displacement sensor 8 through the battery module. When there is fluid movement in the expansion joint, it drives the impeller mechanism to move and synchronously drives the generator to generate electric energy to supply the battery module; the method of using the moving fluid in the pipeline to generate electricity by itself provided in this embodiment, supplying electric energy to the inclination sensor 4 and the wire-drawing displacement sensor 8 devices and storing the excess electric energy for the power supply of the sensor devices during the on-site empty pipe period, can reduce the frequency of disassembling and replacing the battery of the on-site sensor devices and extend the service life of the sensors.

[0034] In another embodiment provided by the present invention, both the inclination sensor 4 and the wire-drawing displacement sensor 8 are selected as MEMS sensors. MEMS sensors have the advantages of small volume and low power consumption and are suitable for engineering applications.

[0035] In another embodiment provided by the present invention, both the inclination and displacement sensing are selected to transmit data in the NB-IOT mode, which is convenient for installation and layout and reduces the cost of self-networking.

[0036] In another embodiment provided by the present utility model, the cable-type displacement sensor 8 includes a rotary encoder 81 fixed on the outer wall of the left end connection pipe 1. A spring recovery mechanism (not shown in the figure) is connected to the rotary encoder 81. Preferably, the spring recovery mechanism includes a reel rotatably mounted on the rotary encoder 81 and a torsion spring connected between the reel and the rotary encoder 81. A pull rope 82 is wound around the spring recovery mechanism. The spring recovery mechanism is used to keep the pull rope 82 always in a certain tension state. A connection block 83 is formed on the outer wall of the right end connection pipe 6. The rotary encoder 81 and the connection block 83 are arranged corresponding to each other. In the initial state, the horizontal connection line between the two is parallel to the axis of the expansion joint. The movable end of the pull rope 82 is fixed on the connection block 83. The connection block 83 is preferably a square block. In the initial state, the pull rope 82 is parallel to the axis of the expansion joint. When the pull rope 82 is pulled out or retracted, the rotary encoder 81 measures the movement amount of the pull rope 82, so as to provide displacement information. The inclination sensor 4 is used to detect the angle change of the expansion joint. Specifically, it is to detect the angle between the pull rope 82 and the horizontal plane.

[0037] In another embodiment provided by the present utility model, it further includes a sealed box detachably installed in the left end connection pipe 1, and the self-power generation device 7 is arranged in the sealed box.

[0038] In another embodiment provided by the present utility model, it further includes a terminal display device 9. The terminal display device 9 is electrically connected to the inclination sensor 4, and the terminal display device 9 is also electrically connected to the cable-type displacement sensor 8. The terminal display device 9 is used to display the data information provided by the inclination sensor 4 and the cable-type displacement sensor 8, and give a prompt alarm to the staff.

[0039] Further, referring to Figure 4 , since the moving fluid is introduced into the expansion joint, it will inevitably cause vibration of the left end connection pipe 1. The cable-type displacement sensor 8 is fixed on the left end connection pipe 1. After long-term operation, the fasteners (such as screws, nuts, etc.) inside the cable-type displacement sensor 8 may become loose, and may also damage the equipment, affecting the accuracy and reliability of the detection of the cable-type displacement sensor 8. Therefore, this embodiment provides a further improvement scheme. It should be noted that in this embodiment, the rotary encoder 81 is no longer fixed on the left end connection pipe 1; a right support frame 84 is fixed on the outer side wall of the left end connection pipe 1, the rotary encoder 81 is slidably installed on the fixed support frame 84, and a shock-absorbing spring 85 is connected between the rotary encoder 81 and the fixed support frame 84. When the left end connection pipe 1 vibrates, it synchronously drives the support frame 84 to vibrate, and the shock-absorbing spring 85 buffers the vibration transmitted from the support frame 84 to the rotary encoder 81, so as to protect the rotary encoder 81.

[0040] Furthermore, in different usage scenarios, bellows of different specifications and dimensions may be selected. Since the horizontal height of the pull rope 82 is fixed, when the bellows is bent, the pull rope 82 may come into contact with the outer wall of the bellows, which affects the accuracy of the detection of the wire-pulling displacement sensor 8 and also causes wear of the pull rope 82, reducing the service life of the wire-pulling displacement sensor 8. Therefore, the present embodiment provides a further solution. A bolt 86 is threadedly connected to the left-end connecting pipe 1, and the bolt 86 is arranged corresponding to the rotary encoder 81. Under the elastic action of the shock-absorbing spring 85, one end of the bolt 86 away from the left-end connecting pipe 1 abuts against the rotary encoder 81. By adjusting the distance between the rotary encoder 81 and the outer wall of the left-end connecting pipe 1, the distance between the bellows and the outer wall of the left-end connecting pipe 1 can be adjusted. Specifically, when it is necessary to adjust the distance between the rotary encoder 81 and the left-end connecting pipe 1, the bolt 86 is driven to rotate, so that the bolt 86 moves outward and pushes the rotary encoder 81 away from the left-end connecting pipe 1. In this way, the distance between the bellows and the outer wall of the left-end connecting pipe 1 can be adaptively enlarged. Similarly, it can be known that the connecting block 83 can also adjust the distance from the outer wall of the left-end connecting pipe 1 in the same way, so that the connecting block 83 and the rotary encoder 81 are kept in a corresponding state. When the connecting block 83 is adjusted, the pull rope 82 moves synchronously. Thus, in the initial state, after synchronously adjusting the rotary encoder 81 and the connecting block 83, on the premise that the horizontal connection line between the rotary encoder 81 and the connecting block 83 is still parallel to the axis of the expansion joint, the distance between the pull rope 82 and the bellows is synchronously enlarged, so as to adapt to bellows of different specifications and dimensions and avoid the contact between the pull rope 82 and the outer wall of the bellows.

[0041] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A displacement monitoring expansion joint for water conservancy and hydropower industry, comprising a left end pipe, a left end bellows, a middle pipe, a right end bellows and a right end pipe fixed together in sequence, characterized in that: A wire-drawing displacement sensor is installed at the middle position of the outer wall of the left end pipe.

2. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 1 is characterized in that: An inclination sensor is installed at the middle position of the outer wall of the intermediate pipe.

3. A displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 2, characterized in that: It also includes a self-generating device, which is connected to the left end of the pipe through a flange, and is used to supply power to the inclination sensor and the wire-type displacement sensor.

4. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 2 is characterized in that: The inclination sensor and the wire-type displacement sensor are both MEMS sensors.

5. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 2 is characterized in that: The inclination and displacement sensors both use NB-IOT to transmit data.

6. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 1 is characterized in that: The pull-wire displacement sensor includes a rotary encoder fixed on the outer wall of the left end pipe, the rotary encoder is connected to a spring recovery mechanism, a pull rope is wound on the spring recovery mechanism, a connecting block is formed on the outer wall of the right end pipe, and the movable end of the pull rope is fixed on the connecting block; when the pull rope is pulled out or retracted, the rotary encoder measures the movement of the pull rope, thereby providing displacement information.

7. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 3 is characterized in that: The self-generating device generates self-generated electricity by utilizing the moving fluid in the pipeline to supply power to the inclination sensor and the wire-drawing displacement sensor.

8. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 7 is characterized in that: The self-generating device includes an impeller mechanism, a generator and a battery module. The impeller mechanism is installed in the left end connecting pipe. The impeller mechanism is used to absorb the kinetic energy of the fluid and transmit it to the coaxially rotating generator. The generator supplies the generated electrical energy to the battery module. The battery module is used to store electrical energy. The inclination sensor and the wire-type displacement sensor are powered by the battery module.

9. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 3 is characterized in that: It also includes a detachable sealing box installed in the left end pipe, and the self-generating device is arranged in the sealing box.

10. The displacement monitoring expansion joint for water conservancy and hydropower industry according to claim 1, characterized in that: It also includes a terminal display device, which is electrically connected to the tilt sensor, and the terminal display device is also electrically connected to the wire-type displacement sensor.

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