CN113932998A - Device and method for testing sealing performance of cable intermediate joint - Google Patents
Device and method for testing sealing performance of cable intermediate joint Download PDFInfo
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- CN113932998A CN113932998A CN202111294618.XA CN202111294618A CN113932998A CN 113932998 A CN113932998 A CN 113932998A CN 202111294618 A CN202111294618 A CN 202111294618A CN 113932998 A CN113932998 A CN 113932998A
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Abstract
The device comprises a sealing structure and a testing device, wherein the sealing structure is provided with a sealing cavity for placing the cable intermediate joint; the testing device comprises a control circuit board, a vacuum pump, an electromagnetic air valve and a digital pressure sensor module, wherein the control circuit board is used for controlling the vacuum pump to inflate or deflate, then the electromagnetic air valve is turned off, the air pressure value detected by the digital pressure sensor module is collected, and the sealing performance testing result of the cable intermediate joint is obtained according to the analysis of the air pressure value. After the vacuum pump is used for inflating or exhausting, the air pressure value detected by the digital pressure sensor module can reflect the air pressure change of the sealing cavity, so that the sealing performance of the cable intermediate joint is evaluated, and the test reliability is high.
Description
Technical Field
The application relates to the technical field of distribution network cable intermediate joints, in particular to a device and a method for testing the sealing performance of a cable intermediate joint.
Background
Along with the continuous expansion of urbanization, the requirement for city appearance is higher and higher, the erection of power lines in cities is gradually changed from the original overhead lines to the use of underground cables, the use of electric wires and cables reduces the use of electric wires similar to city spiders, and meanwhile, the safety performance is improved. When the cable is laid, two sections of cables are often connected by making a cable middle head. The operation quality of the cable middle head is very critical, and the key that whether the whole line can run safely or not can be influenced. Therefore, how to perform reliable sealing performance test on the cable intermediate joint is an urgent problem to be solved.
Disclosure of Invention
In view of the above, it is necessary to provide a device and a method for testing the sealing performance of a cable intermediate joint with high testing reliability.
A device for testing the sealing performance of a cable intermediate joint comprises a sealing structure and a testing device, wherein the sealing structure is provided with a sealing cavity for placing the cable intermediate joint; the testing device comprises a control circuit board, a vacuum pump, an electromagnetic air valve and a digital pressure sensor module, wherein an air inlet of the electromagnetic air valve is connected with the vacuum pump through an air pipe, an air outlet of the electromagnetic air valve is connected with an air inlet of the digital pressure sensor module through an air pipe, an air outlet of the digital pressure sensor module is communicated with the sealing cavity through an air pipe, and the control circuit board is connected with the vacuum pump, the electromagnetic air valve and the digital pressure sensor module through data lines;
the control circuit board is used for controlling the vacuum pump to inflate or deflate, then the electromagnetic air valve is turned off, the air pressure value detected by the digital pressure sensor module is collected, and the sealing performance test result of the cable intermediate connector is obtained according to the analysis of the air pressure value.
In one embodiment, the control circuit board controls the vacuum pump to inflate or deflate, the electromagnetic air valve is turned off after the digital pressure sensor module detects that the air pressure reaches a corresponding air pressure threshold value, the air pressure detected by the digital pressure sensor module within the air pressure holding time is recorded, and a cable intermediate joint sealing performance test result is obtained according to the recorded air pressure change condition within the air pressure holding time.
In one embodiment, the sealing structure comprises a structural body and an air nozzle, the structural body is provided with the sealing cavity, the air nozzle is arranged on the structural body and communicated with the sealing cavity, and the air nozzle is connected with an air outlet of the digital pressure sensor module through an air pipe.
In one embodiment, the structural body comprises a first structural body and a second structural body, one side of the first structural body is connected with one side of the second structural body, and the other side of the first structural body and the other side of the second structural body are both provided with sealing teeth.
In one embodiment, the sealing structure further comprises sealing rings, the first structural body and the second structural body are both semi-cylindrical structures, and the sealing rings are arranged at two opposite ends of the first structural body and the second structural body when the first structural body and the second structural body are closed through the sealing teeth; the sealing ring comprises a first sealing part matched with the first structural body and the second structural body and a second sealing part matched with a cable.
In one embodiment, the seal structure further comprises a clamp for clamping the first and second structures after they are closed by the seal teeth.
In one embodiment, the digital pressure sensor module comprises a pressure sensor and an ADC interface chip, wherein the ADC interface chip is connected with the pressure sensor and the control circuit board.
In one embodiment, the testing device further comprises a man-machine interface panel and an energy storage device which are connected with the control circuit board.
In one embodiment, the control circuit board includes a controller, an interface circuit and a charge and discharge management circuit, the controller is connected to the interface circuit and connected to the energy storage device through the charge and discharge management circuit, and the interface circuit is connected to the vacuum pump, the electromagnetic gas valve, the digital pressure sensor module and the human-computer interface panel through data lines.
A method for testing the sealing performance of a cable intermediate joint is realized based on the device for testing the sealing performance of the cable intermediate joint, and comprises the following steps:
after the vacuum pump is controlled to inflate or exhaust, the electromagnetic air valve is cut off;
and acquiring an air pressure value detected by the digital pressure sensor module, and analyzing according to the air pressure value to obtain a test result of the sealing performance of the cable intermediate joint.
According to the device and the method for testing the sealing performance of the cable intermediate joint, the cable intermediate joint is placed in the sealing cavity in the sealing structure, the vacuum pump is controlled by the control circuit board to be inflated or exhausted, then the vacuum pump is turned off, the air pressure value detected by the digital pressure sensor module is collected, and the testing result of the sealing performance of the cable intermediate joint is obtained according to the analysis of the air pressure value. After the vacuum pump is used for inflating or exhausting, the air pressure value detected by the digital pressure sensor module can reflect the air pressure change of the sealing cavity, so that the sealing performance of the cable intermediate joint is evaluated, and the test reliability is high.
Drawings
FIG. 1 is a schematic structural diagram of a device for testing the sealing performance of a cable intermediate joint in one embodiment;
FIG. 2 is a block diagram showing the structure of the test apparatus according to an embodiment;
FIG. 3 is a front view of a seal in one embodiment;
FIG. 4 is a side view of a sealing structure in an embodiment;
FIG. 5 is a side view of a seal ring according to one embodiment;
FIG. 6 is a top view of a seal ring according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 present application and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, the terminology used in this specification includes any and all combinations of the associated listed items.
In one embodiment, as shown in fig. 1 and 2, a cable intermediate joint sealing performance testing device is provided, which comprises a sealing structure 110 and a testing device 120, wherein the sealing structure 110 is provided with a sealing cavity 112 for placing a cable intermediate joint 210. The testing device 120 comprises a control circuit board 121, a vacuum pump 122, an electromagnetic air valve 123 and a digital pressure sensor module 124, wherein an air inlet of the electromagnetic air valve 123 is connected with the vacuum pump 122 through an air pipe, an air outlet of the electromagnetic air valve 123 is connected with an air inlet of the digital pressure sensor module 124 through an air pipe, an air outlet of the digital pressure sensor module 124 is communicated with a sealing cavity 112 of the sealing structure 110 through an air pipe, and the control circuit board 121 is connected with the vacuum pump 122, the electromagnetic air valve 123 and the digital pressure sensor module 124 through data lines. The control circuit board 121 is configured to control the vacuum pump 122 to perform inflation or air extraction, turn off the electromagnetic air valve 123, collect an air pressure value detected by the digital pressure sensor module 124, and analyze the air pressure value to obtain a sealing performance test result of the cable intermediate connector 210. The vacuum pump 122 may be a micro air compression pump.
Specifically, when it is required to perform a sealing performance test on the cable intermediate connector 210, a tester first places the cable intermediate connector 210 in the sealing cavity 112 of the sealing structure 110, and the cable 220 extends to the outside of the sealing structure 110, and a sealing ring or other sealing material may be disposed on the sealing structure 110 at an opening position where the cable 220 extends out to prevent air leakage. The electromagnetic air valve 123 is firstly opened through the control circuit board 121, the vacuum pump 122 is controlled to inflate so that the sealing cavity 112 forms positive pressure, the electromagnetic air valve 123 is closed, and the air pressure value detected by the digital pressure sensor module 124 is recorded. Then the control circuit board 121 opens the electromagnetic air valve 123, controls the vacuum pump 122 to perform air suction to enable the sealed cavity 112 to form negative pressure, closes the electromagnetic air valve 123, and records the air pressure value detected by the digital pressure sensor module 124.
The control circuit board 121 may display or print the air pressure values recorded when the sealed cavity 112 is under positive pressure and negative pressure, so that a tester can analyze whether the cable middle joint is up to standard according to the detected air pressure values. In addition, the control circuit board 121 may also automatically analyze the air pressure change in the sealed cavity 112 according to the recorded air pressure value, and determine whether the sealing performance of the cable intermediate connector 210 reaches the standard according to the air pressure change. For example, if the gas pressure in the sealed cavity 112 is detected to be too large when the sealed cavity 112 is formed with positive pressure, it may be considered that the cable intermediate connector 210 is not sealed properly, and the gas in the sealed cavity 112 leaks from the cable intermediate connector 210 to the cable 220 and is discharged out of the sealed structure 110, so as to cause the gas pressure detected by the digital pressure sensor module 124 to drop; if the air pressure in the sealed cavity 112 is detected to be too large when the negative pressure is formed in the sealed cavity 112, the cable intermediate connector 210 is also considered to be not sealed properly, and the air outside the sealing structure 110 enters the sealed cavity 112 from the cable intermediate connector 210 through the cable 220, resulting in the air pressure detected by the digital pressure sensor module 124 being increased.
Further, in an embodiment, the control circuit board 121 controls the vacuum pump 122 to inflate or deflate, turns off the electromagnetic air valve 123 after the digital pressure sensor module 124 detects that the air pressure reaches a corresponding air pressure threshold, records the air pressure detected by the digital pressure sensor module 124 within the air pressure retention time, and obtains a cable intermediate connector sealing performance test result according to the recorded air pressure change condition within the air pressure retention time.
The tester can save parameters such as an air pressure threshold value, an air pressure holding time, an alarm air pressure value and the like in the control circuit board 121 in advance. It can be understood that the specific values of the air pressure threshold, the air pressure holding time and the alarm air pressure value are not unique and can be set according to the actual situation. Specifically, the air pressure threshold includes an inflation air pressure threshold and a suction air pressure threshold, the control circuit board 121 controls the vacuum pump 122 to inflate to reach the inflation air pressure threshold, then the electromagnetic air valve 123 is turned off, and the air pressure detected by the digital pressure sensor module 124 within the air pressure holding time is recorded. Then, the control circuit board 121 opens the electromagnetic air valve 123, controls the vacuum pump 122 to perform air suction to reach the air suction pressure threshold, turns off the electromagnetic air valve 123, and records the air pressure detected by the digital pressure sensor module 124 within the air pressure holding time. According to the air pressure values recorded under the positive pressure and the negative pressure, if the air pressure variation in the air pressure maintaining time analyzed by the control circuit board 121 is less than or equal to the alarm air pressure value, the sealing performance of the cable intermediate joint 210 can be considered to be qualified. On the contrary, if the air pressure variation amount in the air pressure holding time under the positive pressure or the negative pressure is greater than the alarm air pressure value, the sealing performance of the cable intermediate joint 210 may be considered to be not good.
The specific structure of the Digital pressure sensor module 124 is not exclusive, and in one embodiment, the Digital pressure sensor module includes a pressure sensor and an ADC (analog-to-Digital Conversion) interface chip, which connects the pressure sensor and the control circuit board 121. Specifically, the pressure sensor may be a high-precision piezoresistive pressure sensor, the ADC interface chip is connected to the control circuit board 121 through a connection cable, the connection cable provides a power supply from the control circuit board 121 to power the digital pressure sensor module 124, and the data line is a communication line between the digital pressure sensor module 124 and the interface circuit on the control circuit board 121 and is responsible for data transmission of the digital pressure sensor module 124.
In one embodiment, with continued reference to FIG. 2, the test device 120 further includes a human interface panel 125 coupled to the control circuit board 121 and an energy storage device 126. Specifically, the human interface panel 125 includes a display screen and a driving circuit, and the driving circuit is connected to the display screen and connected to the control circuit board 121 through a flat cable. The display screen may be a touch display screen, and a tester may set parameters through the touch display screen, for example, parameters such as an input air pressure threshold, an air pressure holding time, and an alarm air pressure value are stored in the control circuit board 121. After the air pressure values recorded under the positive pressure and the negative pressure are recorded, the control circuit board 121 may further generate an air pressure monitoring chart according to the recorded air pressure values and send the air pressure monitoring chart to the touch display screen for displaying. In addition, the human-computer interface panel 125 may further include buttons connected to the control circuit board 121, and the tester may also perform parameter setting through the buttons.
Further, in one embodiment, the human interface panel 125 may further include an alarm circuit connected to the control circuit board 121, and the alarm circuit may specifically include an alarm lamp, a speaker, and the like. Taking a loudspeaker as an example, when the control circuit board 121 analyzes that the air pressure variation in the air pressure holding time under positive pressure or negative pressure is greater than the alarm air pressure value, the loudspeaker can be controlled to give an alarm sound to remind a tester that the sealing performance of the cable intermediate joint 210 tested at this time is not qualified. Further, the energy storage device 126 may specifically employ a storage battery for providing power to the control circuit board 121, the human interface panel 125 and the digital pressure sensor module 124.
In one embodiment, the control circuit board 121 includes a controller, an interface circuit and a charging and discharging management circuit, the controller is connected to the interface circuit and is connected to the energy storage device 126 through the charging and discharging management circuit, and the interface circuit is connected to the vacuum pump 122, the electromagnetic gas valve 123, the digital pressure sensor module 124 and the human-machine interface panel 125 through data lines. The controller may specifically adopt an MCU (Micro Control Unit).
It is to be understood that the specific structure of the sealing structure 110 is not exclusive, and in one embodiment, as shown in fig. 3 and 4, the sealing structure includes a structural body and an air tap 114, the structural body is provided with a sealing cavity, the air tap 114 is arranged on the structural body and is communicated with the sealing cavity, and the air tap 114 is connected with the air outlet of the digital pressure sensor module 124 through an air pipe. In addition, an air drying agent may be disposed in the air inlet 114 to prevent air with too high humidity from entering the middle of the cable 220 due to poor manufacture of the cable middle joint 210.
Specifically, the shape of the structural body is not exclusive, and may be a cylindrical shape, a rectangular parallelepiped shape, or other shapes. In one embodiment, the structural body includes a first structural body 116 and a second structural body 118, one side of the first structural body 116 is connected to one side of the second structural body 118, and the other side of the first structural body 116 and the other side of the second structural body 118 are each provided with a sealing tooth 119. In this embodiment, the first structural body 116 and the second structural body 118 are both semi-cylindrical structures, and the other side of the first structural body 116 and the other side of the second structural body 118 are closed by the sealing teeth 119 to form a cylindrical sealing cavity 112 for placing the cable intermediate joint 210.
Further, in one embodiment, as shown in fig. 5 and 6, the sealing structure 110 further includes a sealing ring 117, the first structure 116 and the second structure 118 are both semi-cylindrical structures, and the sealing ring 117 is disposed at two opposite ends of the first structure 116 and the second structure 118 when the first structure 116 and the second structure 118 are closed by the sealing teeth 119; wherein the seal 117 includes a first seal portion 1172 that mates with the first structure 116 and the second structure 118, and a second seal portion 1174 that mates with the cable 220. The material of the seal 117 is not exclusive, and in this embodiment, the seal 117 is made of a highly elastic rubber.
Specifically, the first sealing portion 1172 of the gasket 117 is sized to fit between the first and second bodies 116, 118, and the second sealing portion 1174 of the gasket 117 fits within the cable 220. When the cable intermediate joint 210 needs to be tested, the second sealing parts 1174 of the sealing rings 117 are firstly sleeved on the cables 220 at the two ends of the cable intermediate joint 210, the cable intermediate joint 210 is placed in the sealing cavity 112, then the first structural body 116 and the second structural body 118 are closed through the sealing teeth 119, and the first sealing parts 1172 of the sealing rings 117 are located at the openings at the two sides of the cavity, so that the sealing effect at the two ends of the sealing cavity 112 is enhanced.
In addition, the sealing structure 110 may further include a clamp for clamping the first structural body 116 and the second structural body 118 after being closed by the sealing teeth 119, so as to further improve the sealing effect of the sealing structure 110 and facilitate the testing of the cable intermediate joint 210.
After the vacuum pump 122 is used for inflating or evacuating, the air pressure value detected by the digital pressure sensor module 124 can reflect the air pressure change of the sealing cavity 112, so that the sealing performance of the cable intermediate joint 210 is evaluated, and the testing reliability is high.
In an embodiment, there is also provided a method for testing the sealing performance of a cable intermediate joint, which is implemented based on the device for testing the sealing performance of a cable intermediate joint, and the method includes: after the vacuum pump is controlled to inflate or exhaust, the electromagnetic air valve is cut off; and acquiring an air pressure value detected by the digital pressure sensor module, and analyzing according to the air pressure value to obtain a test result of the sealing performance of the cable intermediate joint. And further, controlling the vacuum pump to inflate or evacuate, switching off the electromagnetic air valve after the digital pressure sensor module detects that the air pressure reaches a corresponding air pressure threshold value, recording the air pressure detected by the digital pressure sensor module within the air pressure holding time, and obtaining a test result of the sealing performance of the cable intermediate joint according to the recorded air pressure change condition within the air pressure holding time.
According to the method for testing the sealing performance of the cable intermediate joint, after the vacuum pump is used for inflating or exhausting, the air pressure value detected by the digital pressure sensor module can reflect the air pressure change of the sealing cavity, so that the sealing performance of the cable intermediate joint is evaluated, and the testing reliability is high.
In order to better understand the device and the method for testing the sealing performance of the cable intermediate joint, the following detailed description is made in conjunction with specific embodiments.
As mentioned in the background of the invention, it is often necessary to connect two lengths of cable together by making a cable intermediate head. The operation quality of the cable middle head is very critical, and the key that whether the whole line can run safely or not can be influenced. Among the statistical cable accidents in the power industry, more than 90% of the cable accidents are caused by the middle head of the cable. In the operation specification of the cable middle head, the waterproof effect of the middle head is mainly ensured according to the operation process requirements, measures such as the winding mode of a waterproof adhesive tape, the use of moisture-proof mud and the like. After the operation is finished, the process and the actual sealing performance are difficult to find. The existing cable test mode adopts an oscillatory wave test, a voltage withstand test, an insulation resistance test and the like, but the sealing performance of a cable intermediate joint cannot be detected.
Therefore, the application designs a cable middle head sealing performance test sample device, a digital visual test is carried out on the sealing performance of the cable middle head after the operation of the cable middle head is finished through a sealing cavity and a test device, if the sealing performance is lower than an index value, an operator is required to detach the cable middle head to be constructed again, the operation of the whole cable with potential safety hazards is avoided, the safety risk is reduced, meanwhile, greater property loss is avoided, and the power supply reliability of a power grid is improved.
Specifically, the cable middle head sealing performance test device comprises a sealing cavity structure and a test device. The sealing cavity structure is provided with an air nozzle, the sealing cavity is inflated or deflated through a connecting air pipe, the whole structure of the sealing cavity is two half hollow cylinders which are bonded together, the other side of the sealing cavity is separated, the finished cable middle head can be wrapped through the side of the opening, then the opening side is tightly pressed and sealed through a clamp, a sealed cavity is formed around the cable middle head, and the sealing performance of the cable middle head is tested through the operation of adding air pressure or pumping negative pressure to the sealing cavity. Two ends of the sealing cavity are provided with two sealing rings and are made of high-elasticity rubber, so that the sealing effect of the two ends of the sealing cavity is enhanced.
After the middle head of the cable is wrapped by the sealing cavity, the quick large force clamp is adopted to clamp the sealing joint, and the sealing effect is improved. An air drying agent is connected in front of the air inlet nozzle of the sealed cavity, so that air with overhigh humidity is prevented from entering the middle of the cable due to poor manufacture of the cable middle joint under high pressure.
The testing device consists of a control circuit board, a vacuum pump, an electromagnetic air valve, a man-machine interface panel, a storage battery, a digital pressure sensor module, a shell and other unit circuits. The air outlet of the vacuum pump is connected with the air inlet of the electromagnetic air valve through an air pipe, the air outlet end of the electromagnetic air valve is connected with the air inlet of the air pressure sensor through an air pipe, and the air outlet of the digital pressure sensor is connected with the air nozzle through an air pipe.
The man-machine interface panel consists of a display screen and a driving circuit and is connected with the control circuit board through a flat cable. The parameters such as inflation pressure, air pressure holding time, alarm air pressure value and the like can be set and adjusted through buttons on the interface panel, the sealing performance of the middle head of the cable can be automatically judged through the parameters, and if the reduction exceeds a set threshold value after the air pressure is kept for a certain time, the testing device gives an alarm.
The digital pressure sensor module comprises a high-precision sub-resistance type pressure sensor and an ADC (analog to digital converter) interface IC (Integrated Circuit), the module is connected with the control Circuit board through a connecting flat cable, a connecting wire supplies power to the module from a power supply on the control Circuit board, and a data wire is an interface Circuit communication wire on the module and the control Circuit board and is responsible for data transmission of the digital pressure sensor module.
The storage battery supplies power for the control circuit board, the man-machine interface panel and the digital pressure sensor, adopts a rechargeable battery, and can be repeatedly used after being charged by the charger. The control circuit board is composed of a control MCU, an interface circuit and a charge and discharge management circuit, and is mounted together through a printed circuit board.
The test process of the cable middle head sealing performance test device is as follows:
1. the test device is connected with the air nozzle on the sealing cavity structure through the air pipe, and the air pipe connector adopts a standard quick connector and can quickly complete connection.
2. And turning on a power switch of the testing device, starting the testing device, and setting testing parameters such as inflation pressure, air pressure holding time, air pressure alarm threshold value and the like through a human-computer interface panel.
3. After the above setting is completed, the sealed chamber is inflated (positive pressure test). When the air pressure reaches a set value, the controller controls the electromagnetic air valve to cut off the air pipe and stop inflating. The digital air pressure sensor monitors the air pressure in the sealing cavity.
4. After the positive pressure test is completed, the negative pressure test is carried out, relevant parameters are set, then the vacuum pump is started to exhaust air, air in the sealed cavity is exhausted and evacuated, negative pressure is formed in the sealed cavity, the air pump stops working after the air pressure reaches a set value, the electromagnetic air valve is closed, the air pressure value in the sealed cavity is detected, and an audible and visual alarm prompt sound is sent out when the air pressure value is higher than the set value.
Before the intermediate joint of the cable is manufactured, the sealing rings are required to be sleeved on two sections of wires which are not connected, and before the two halves of the sealing cavity are folded, the sealing rings are placed at openings on two sides of the cavity to enhance the sealing effect of the two ends of the cavity. After the test is finished, the cavity is disassembled, and the sealing ring is cut off and taken away from the cable.
After the operation of the cable middle head is finished, digital test evaluation is carried out on the operation effect, namely the sealing performance of the cable middle head, whether the cable middle head connector can meet the requirement of the safety level is checked through direct digital indexes, and the test carries out rework and reinstallation on the cable middle head which does not reach the standard, so that the safety risk of the cable middle head can be reduced, and property loss is reduced.
First sealing performance test device in middle of above-mentioned cable has following beneficial effect:
1. the test method can be used for quickly carrying out test on the constructed cable middle head on an operation site, and the test result is digitally displayed and simply and visually reflects whether the cable middle head construction process is fully qualified or not.
2. The portable structure, seal chamber and test device are the disconnect-type, conveniently go out to carry, couple together through the trachea when using. The test device is internally provided with a miniature air compression pump, adopts a storage battery for power supply, and compressed air enters the sealing cavity, so that the test device is light and convenient, and an external air compressor is not required to be used as an inflator pump.
3. The cable middle head inspected by the test equipment is safer and more reliable, and compared with the prior visual method which depends on experience and process specification requirements during operation, the method has higher judgment accuracy and is more reasonable.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The device for testing the sealing performance of the cable intermediate joint is characterized by comprising a sealing structure and a testing device, wherein the sealing structure is provided with a sealing cavity for placing the cable intermediate joint; the testing device comprises a control circuit board, a vacuum pump, an electromagnetic air valve and a digital pressure sensor module, wherein an air inlet of the electromagnetic air valve is connected with the vacuum pump through an air pipe, an air outlet of the electromagnetic air valve is connected with an air inlet of the digital pressure sensor module through an air pipe, an air outlet of the digital pressure sensor module is communicated with the sealing cavity through an air pipe, and the control circuit board is connected with the vacuum pump, the electromagnetic air valve and the digital pressure sensor module through data lines;
the control circuit board is used for controlling the vacuum pump to inflate or deflate, then the electromagnetic air valve is turned off, the air pressure value detected by the digital pressure sensor module is collected, and the sealing performance test result of the cable intermediate connector is obtained according to the analysis of the air pressure value.
2. The device for testing the sealing performance of the intermediate joint of the cable according to claim 1, wherein the control circuit board controls the vacuum pump to inflate or deflate, turns off the electromagnetic gas valve after the digital pressure sensor module detects that the gas pressure reaches a corresponding gas pressure threshold value, records the gas pressure detected by the digital pressure sensor module within a set gas pressure holding time, and obtains a testing result of the sealing performance of the intermediate joint of the cable according to the recorded gas pressure change condition within the gas pressure holding time.
3. The device for testing the sealing performance of the cable intermediate joint according to claim 1, wherein the sealing structure comprises a structural body and an air nozzle, the structural body is provided with the sealing cavity, the air nozzle is arranged on the structural body and communicated with the sealing cavity, and the air nozzle is connected with an air outlet of the digital pressure sensor module through an air pipe.
4. The device for testing the sealing performance of the cable intermediate joint according to claim 3, wherein the structural body comprises a first structural body and a second structural body, one side of the first structural body is connected with one side of the second structural body, and sealing teeth are arranged on the other side of the first structural body and the other side of the second structural body.
5. The device for testing the sealing performance of the cable intermediate joint according to claim 4, wherein the sealing structure further comprises sealing rings, the first structural body and the second structural body are both semi-cylindrical structures, and the sealing rings are arranged at two opposite ends of the first structural body and the second structural body when the first structural body and the second structural body are closed through the sealing teeth; the sealing ring comprises a first sealing part matched with the first structural body and the second structural body and a second sealing part matched with a cable.
6. The cable intermediate joint sealing performance testing device according to claim 4, the sealing structure further comprising a clamp for clamping after the first structural body and the second structural body are closed by the sealing teeth.
7. The device for testing the sealing performance of the cable intermediate joint according to any one of claims 1 to 6, wherein the digital pressure sensor module comprises a pressure sensor and an ADC interface chip, and the ADC interface chip is connected with the pressure sensor and the control circuit board.
8. The device for testing the sealing performance of the intermediate joint of the cable according to any one of claims 1 to 6, wherein the testing device further comprises a man-machine interface panel and an energy storage device which are connected with the control circuit board.
9. The device for testing the sealing performance of the cable intermediate joint according to claim 8, wherein the control circuit board comprises a controller, an interface circuit and a charge and discharge management circuit, the controller is connected with the interface circuit and is connected with the energy storage device through the charge and discharge management circuit, and the interface circuit is connected with the vacuum pump, the electromagnetic gas valve, the digital pressure sensor module and the human-machine interface panel through data lines.
10. A method for testing the sealing performance of a cable intermediate joint, which is implemented based on the device for testing the sealing performance of a cable intermediate joint according to any one of claims 1 to 9, and comprises the following steps:
after the vacuum pump is controlled to inflate or exhaust, the electromagnetic air valve is cut off;
and acquiring an air pressure value detected by the digital pressure sensor module, and analyzing according to the air pressure value to obtain a test result of the sealing performance of the cable intermediate joint.
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| CN116164913A (en) * | 2023-04-24 | 2023-05-26 | 日照市计量科学研究院 | Air tightness testing device for cable connector |
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