CN212807527U - Underwater long-distance cable water tightness detection system - Google Patents
Underwater long-distance cable water tightness detection system Download PDFInfo
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- CN212807527U CN212807527U CN202021632371.9U CN202021632371U CN212807527U CN 212807527 U CN212807527 U CN 212807527U CN 202021632371 U CN202021632371 U CN 202021632371U CN 212807527 U CN212807527 U CN 212807527U
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Abstract
The utility model belongs to cable detection area under water to specifically disclose a long distance cable water proofness detecting system under water, it includes aerifys pressurize module, cable butt joint module, cable end cap module, control module, wherein: the inflation and pressure maintaining module comprises a compressor and a pressure bottle, and the compressor is used for inflating the pressure bottle; the cable plug module comprises a plug device body and a third pressure sensor; the butt joint device body and the plug device body are used for accessing the cable to be detected from two sides; the butt joint device body is communicated with the pressure bottle, and a second electromagnetic valve is arranged between the butt joint device body and the pressure bottle; the control module comprises a controller used for collecting data of the pressure sensor and controlling the opening and closing of the electromagnetic valve. The utility model discloses the system is applicable to the test of the underwater cable water tightness of having laid, and the simple structure, and the mobility is strong.
Description
Technical Field
The utility model belongs to cable detection area under water, more specifically relates to a long distance cable water tightness detecting system under water.
Background
The underwater cable is used as important equipment for underwater power transmission and signal transmission, and the reliability of the underwater cable is related to whether the underwater equipment can normally work. The greatest difference between submarine cables and land cables is the requirement for water tightness, including longitudinal and lateral water tightness. Generally, the transverse water tightness test is to place the whole cable into a test water tank, penetrate two ends of the cable out of the water tank, inject water into the water tank, pressurize the water tank and check whether water leaks from the two ends of the cable; one end of the cable is generally placed in a water tank in longitudinal water tightness, then the water tank is filled with water and pressurized, and whether water leaks from the other end of the cable is checked. The standard for judging the water tightness of cables at home and abroad at present is to measure the volume of water leakage (under a specific pressure, the water leakage amount at one end of the cable does not exceed a certain value according to the sectional area of the cable). The existing water tightness detection equipment is mostly suitable for water tightness detection of short-distance and small-sized cables or complete equipment, and can not detect long-distance and large-caliber cables.
Considering that the cable is laid under water during inspection and maintenance, the feasibility of the existing pressurized water injection mode is not high; the water tightness of the cable is obtained by measuring the air tightness, and at present, no relevant device or judgment index exists at home and abroad, so that a device suitable for testing the water tightness of the laid underwater cable is urgently needed.
SUMMERY OF THE UTILITY MODEL
To the above defect or the improvement demand of prior art, the utility model provides an underwater long distance cable water tightness detecting system, its aim at, through aerifing pressurize module, cable butt joint module, cable end cap module cooperation measurement cable gas tightness, and carry out gas tightness data analysis contrast with qualified water tightness cable, indirectly reach the cable water tightness, be applicable to the polytypic, the heavy-calibre, long distance cable under water, and system's simple structure, the mobility is strong, be applicable to the underwater cable water tightness test of having laid, also the gas tightness test of extensible cable.
In order to achieve the above object, the utility model provides an underwater long distance cable water tightness detecting system, including aerifing pressurize module, cable butt joint module, cable end cap module, control module, wherein:
the inflation and pressure maintaining module comprises a compressor and a pressure bottle, and the compressor is used for inflating the pressure bottle;
the cable butt-joint module comprises a butt-joint device body and a second pressure sensor, wherein the second pressure sensor is used for detecting the gas pressure in the butt-joint device body; the cable plug module comprises a plug device body and a third pressure sensor, and the third pressure sensor is used for detecting the gas pressure in the plug device body; the butt joint device body and the plug device body are used for accessing the cable to be detected from two sides; the butt joint device body is communicated with the pressure bottle, and a second electromagnetic valve is arranged between the butt joint device body and the pressure bottle;
the control module comprises a controller for controlling the flow of the second solenoid valve according to the detection value of the second pressure sensor.
Preferably, a first electromagnetic valve is arranged between the compressor and the pressure bottle, and a first pressure sensor is arranged on the pressure bottle and used for detecting the gas pressure in the pressure bottle; the controller is used for controlling the opening and closing of the first electromagnetic valve according to the detection value of the first pressure sensor.
Preferably, the first electromagnetic valve is a two-way one-way electromagnetic valve, and the second electromagnetic valve is a proportional flow valve.
Preferably, the docking device body and the plug device body are correspondingly provided with a plurality of cable holes with different diameters.
Preferably, the control module further includes a touch screen, and the touch screen is used for setting parameters and displaying data acquired by the controller.
Generally, through the utility model above technical scheme who thinks compares with prior art, mainly possesses following technical advantage:
1. the utility model discloses an aerify pressurize module, cable butt joint module, cable end cap module cooperation and measure the cable gas tightness to carry out gas tightness data analysis contrast with qualified water tightness cable, reachs the cable water tightness indirectly, is applicable to the underwater cable water tightness test of having laid, also can expand the gas tightness test for the cable.
2. The system of the utility model has simple structure, strong mobility and considerable economic benefit; and meanwhile, a plurality of cable holes with different diameters are correspondingly formed, so that the underwater cable detection device is suitable for underwater cable detection with various types, large calibers and long distances.
Drawings
Fig. 1 is a schematic view of an apparatus of an underwater long-distance cable water tightness detection system according to an embodiment of the present invention;
fig. 2 is a schematic view of a communication framework of a controller and an actuator according to an embodiment of the present invention;
fig. 3 is the utility model discloses long distance cable water tightness detecting system work flow chart under water.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a pair of long distance cable water tightness detecting system under water, as shown in fig. 1, including aerifing pressurize module, cable butt joint module, cable end cap module, control module, wherein:
the inflation and pressure maintaining module comprises a compressor and a pressure bottle, the compressor is used for inflating the pressure bottle, and a first electromagnetic valve is arranged between the compressor and the pressure bottle; the pressure bottle is a compressed air storage container, and a first pressure sensor is arranged on the pressure bottle and used for detecting the gas pressure in the pressure bottle.
The cable butt-joint module comprises a butt-joint device body and a second pressure sensor, wherein the second pressure sensor is used for detecting the gas pressure in the butt-joint device body; the cable plug module comprises a plug device body and a third pressure sensor, and the third pressure sensor is used for detecting the gas pressure in the plug device body; the butt joint device body is provided with an air vent which is communicated with the pressure bottle through an air pipe, and a second electromagnetic valve is arranged between the air pipe and the pressure bottle;
the butt joint device body and the plug device body are used for being connected into cables to be detected from two sides, and specifically, a plurality of cable holes (such as cable holes with different diameters) are correspondingly formed in the butt joint device body and the plug device body
And the like), each cable hole is provided with a corresponding stuffing box and a corresponding plug, the corresponding cable hole is selected according to the diameter of the cable to be tested, and the rest cable holes are plugged by the stuffing box and the plugs to be sealed.
The control module comprises a controller and a touch screen, as shown in fig. 2, the controller is used for collecting information of the pressure sensors, processing the information, issuing instructions and communicating with the touch screen, specifically, the controller collects information of 3 pressure sensors through 485 communication, communicates with the touch screen through Ethernet communication, controls the compressor and the first electromagnetic valve through 2 paths of switching values, and controls the second electromagnetic valve through the AQ module; the touch screen is used for setting relevant parameters and displaying relevant information, the set parameters mainly comprise an upper limit of air supplement pressure of a pressure bottle, a lower limit of the air supplement pressure of the pressure bottle, a cable air tightness test pressure value, pressure maintaining time and qualified judgment pressure drop, and the parameters set refer to parameter values of qualified watertight cables; the display information mainly comprises a pressure value of a body of the butt joint device, a pressure value of a body of the plug device, a pressure drop value of the cable, pressure drop time, a cable air tightness test result and the like.
Preferably, the first electromagnetic valve is a two-way one-way electromagnetic valve, and the second electromagnetic valve is a proportional flow valve.
The method for detecting the water tightness of the cable by adopting the system comprises the following steps as shown in fig. 3:
(1) detecting system hardware, detecting the air tightness of the stuffing box, the plug and the whole system, and installing a test cable after the test is qualified;
(2) initializing a system, and loading and storing a pressure maintaining time value, a pressure drop value and pressure curve parameters of the qualified watertight cable in the controller (through actual tests, if the water tightness of the underwater cable is good, the condition that no air pressure drop exists within 1min after the cable is injected with air can be met);
(3) when the pressure value measured by the first pressure sensor is smaller than the lower air supplement pressure limit (set value 1) of the pressure bottle set by the touch screen, the controller controls the second electromagnetic valve to be closed, the compressor and the first electromagnetic valve to be opened, and the compressor inflates the pressure bottle;
(4) when the pressure value measured by the first pressure sensor is larger than the upper limit (set value 2) of the air supply pressure of the pressure bottle set by the touch screen, the controller controls the compressor and the first electromagnetic valve to be closed;
(5) if the pressure value measured by the second pressure sensor exceeds the range of the water tightness test pressure value (set value 3) ± 0.01MPA of the cable, the controller controls the proportional flow valve to supplement air to the butt joint device body through the PID algorithm, the set pressure range is reached, the valve port is closed, after multiple times of air injection, if the pressure is gradually stable (no pressure drop within 1 min), pressure maintaining is started, pressure maintaining time is recorded, and if the pressure cannot reach the air tightness test pressure value after multiple times of air injection, the water tightness of the cable is unqualified.
(6) And if the cable does not have pressure drop within 1min, detecting a pressure value of the third pressure sensor, a pressure value of the second pressure sensor and a pressure maintaining time record value, and carrying out data analysis, wherein in the pressure maintaining process, if a pressure curve of the third pressure sensor is consistent with a pressure curve loaded by a system, or the pressure drop difference is differenced with a pressure drop value before delivery, if the maximum pressure drop difference value/pressure value set value is less than 5%, the air tightness of the cable is qualified, and if not, the air tightness of the cable is qualified.
The following are specific examples:
in order to verify the feasibility and the technical effect of the system for detecting the water tightness, the system is adopted to carry out air pressure test and record relevant data such as pressure maintaining time, pressure drop value, pressure curve and the like aiming at the ship communication cable CHJP85/NC with qualified water tightness when the ship is delivered from a factory, and the record of the test data is shown in table 1.
TABLE 1 Water tightness qualified Cable air pressure test data
| Number of tests | Pressure value for water tightness test | Dwell time | Value of pressure drop |
| First test | 0.08MP | 10h | 0.01MP |
| Second test | 0.08MP | 10h | 0.011MP |
| Third test | 0.08MP | 10h | 0.009MP |
| Fourth test | 0.08MP | 10h | 0.01MP |
And after the cable is laid and used underwater for half a year, the cable is detected. According to the test flow, firstly, carrying out air tightness test on the system, and installing a test cable after the test is finished; loading and storing the pressure maintaining time value, the pressure drop value and the pressure curve parameter of the qualified watertight cable in the controller; and opening the electromagnetic valve 2 to supplement air to the cable butt joint device, injecting air for multiple times until the pressure of the system does not drop within 1min, and starting to record the pressure maintaining time and the pressure value, wherein the test data are shown in the following table 2.
TABLE 2 Cable air pressure test data
| Number of tests | Pressure value for water tightness test | Dwell time | Pressure drop for pressure holding |
| First test | 0.08MP | 10h | 0.013MP |
| Second test | 0.08MP | 10h | 0.014MP |
| Third test | 0.08MP | 10h | 0.01MP |
| Fourth test | 0.08MP | 10h | 0.012MP |
It can be seen that the four pressure drop differences are: 3.75%, 3.75%, 1.25%, 2.5%, the maximum pressure drop difference is: 3.75%, this device judgement result is that the cable water tightness is qualified. Recovering the underwater cable, taking 2m of each of the two ends and the middle part of the cable to carry out a conventional water tightness test, increasing the water pressure to 0.1MPa within 1min, and keeping for 3h, wherein during the test, the water leakage volume of the cable is not more than the volume (550 cubic centimeters) calculated according to the following formula:
V＝10N(A+2)
wherein: v is the water leakage volume, N is the number of cable cores, and A is the cross-sectional area of the cable.
The test results were obtained as follows: the water tightness is qualified; therefore, the result of detecting the water tightness of the underwater cable through the system has feasibility and accuracy.
The utility model discloses a gas injection, data such as the pressure difference of detection cable both ends and pressurize time, carry out contrastive analysis with the data of the good cable of water proofness, come to draw the water proofness condition of having laid the cable, it has covered the longitudinal water proofness and the horizontal water proofness of cable; the system can realize the water tightness detection of laid underwater cables, and has the advantages of simple structure, strong mobility and considerable economic benefit.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides an underwater long distance cable water tightness detecting system which characterized in that, is including aerifing pressurize module, cable butt joint module, cable end cap module, control module, wherein:
the inflation and pressure maintaining module comprises a compressor and a pressure bottle, and the compressor is used for inflating the pressure bottle;
the cable butt-joint module comprises a butt-joint device body and a second pressure sensor, wherein the second pressure sensor is used for detecting the gas pressure in the butt-joint device body; the cable plug module comprises a plug device body and a third pressure sensor, and the third pressure sensor is used for detecting the gas pressure in the plug device body; the butt joint device body and the plug device body are used for accessing the cable to be detected from two sides; the butt joint device body is communicated with the pressure bottle, and a second electromagnetic valve is arranged between the butt joint device body and the pressure bottle;
the control module comprises a controller which is used for controlling the opening and closing of the second electromagnetic valve according to the detection value of the second pressure sensor.
2. The underwater long-distance cable water tightness detection system as claimed in claim 1, wherein a first electromagnetic valve is arranged between the compressor and the pressure bottle, and a first pressure sensor is arranged on the pressure bottle and used for detecting the gas pressure in the pressure bottle; the controller is used for controlling the flow of the first electromagnetic valve according to the detection value of the first pressure sensor.
3. The underwater long-distance cable water tightness detection system of claim 2, wherein the first solenoid valve is a two-way one-way solenoid valve, and the second solenoid valve is a proportional flow valve.
4. The underwater long-distance cable water tightness detection system of claim 1, wherein a plurality of cable holes with different diameters are correspondingly formed on the butting device body and the plug device body.
5. The underwater long-distance cable water tightness detection system according to any one of claims 1 to 4, wherein the control module further comprises a touch screen for parameter setting and displaying data acquired by the controller.
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| CN202021632371.9U CN212807527U (en) | 2020-08-07 | 2020-08-07 | Underwater long-distance cable water tightness detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113607351A (en) * | 2021-07-07 | 2021-11-05 | 广东电网有限责任公司广州供电局 | Cable tightness testing device, method, computer equipment and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113607351A (en) * | 2021-07-07 | 2021-11-05 | 广东电网有限责任公司广州供电局 | Cable tightness testing device, method, computer equipment and storage medium |
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