CN111024337A - High-voltage electrical junction box air tightness detection device and detection method thereof - Google Patents
High-voltage electrical junction box air tightness detection device and detection method thereof Download PDFInfo
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- CN111024337A CN111024337A CN201811174637.7A CN201811174637A CN111024337A CN 111024337 A CN111024337 A CN 111024337A CN 201811174637 A CN201811174637 A CN 201811174637A CN 111024337 A CN111024337 A CN 111024337A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/34—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by testing the possibility of maintaining the vacuum in containers, e.g. in can-testing machines
Abstract
The invention provides a device and a method for detecting the air tightness of a high-voltage electric junction box, which solve the technical problem that the air tightness of the high-voltage electric junction box cannot be accurately detected in the prior art. The invention discloses an air tightness detection device of a high-voltage electric junction box, which comprises a vacuum controller, a vacuum generating device and a vacuum sensor, wherein the vacuum generating device and the vacuum sensor are connected with the vacuum controller, the vacuum controller is provided with a first set value, a second set value and a third set value, the second set value, the third set value and the third set value meet the condition that the second set value is larger than the third set value and are larger than or equal to the first set value, the vacuum controller is used for controlling the vacuum generating device to be started and stopped according to a vacuum degree signal of the vacuum sensor, the vacuum generating device is started when the vacuum degree signal is smaller than the first set value, the vacuum generating device is stopped when the vacuum degree signal is.
Description
Technical Field
The invention relates to a device and a method for detecting the air tightness of a high-voltage electric junction box.
Background
For some high-voltage electrical appliances, safety is the first factor to be considered. The air tightness is an important index for ensuring the safety performance of the high-voltage electrical appliance. For example, if the air tightness of a high-voltage junction box of a new energy automobile does not reach the standard, condensed water is accumulated in the junction box, so that the insulation fault of the whole automobile is caused, and a safety accident is caused.
However, in the electric automobile industry, only the IP grade of the high-voltage junction box is required at present, and the airtightness of the high-voltage junction box is not required, so that a detection device specially used for detecting the airtightness of the high-voltage junction box is not available on the market at present.
Generally, the airtightness of the container is mainly detected in two ways. One is a way of inflating and pressurizing, and whether air leakage exists or not is observed within a certain period of time, so that the air tightness of the container is judged. In another vacuum test method, a container to be tested is first evacuated, and the airtightness of the container is determined by the change in the pressure in the container after evacuation.
Chinese utility model patent that publication number is CN 207703421U discloses an automobile wiring harness gas tightness detection module device, and the device is a vacuum pumping detection device, and it includes vacuum generator, aluminium die cavity, switch needle, first solenoid valve, second solenoid valve, locking cylinder, airtight needle, airtight table. When the device is used for detecting the air tightness of the sheath, when the sheath of the piece to be detected is inserted into the bottom end of the aluminum cavity, the sheath compresses the switch needle to conduct the switch needle, the first electromagnetic valve and the second electromagnetic valve are actuated at the moment, the compressed air is transmitted into the locking cylinder through the air pipe after the first electromagnetic valve is actuated to lock the sheath by the locking cylinder, the vacuum generator starts to pump the air in the closed space formed by the aluminum cavity and the sheath after the second electromagnetic valve is actuated, the other end of the air tube is connected with an airtight meter through the airtight needle and the air tube and is used for measuring the air pressure of the airtight space, then, vacuumizing, wherein if the sealing performance of the sheath is qualified, the reading of the airtight meter can reach a set value, namely, the airtight meter is qualified, and then the airtight meter outputs a qualified signal to control the vacuum generator to stop pumping air; if the air tightness of the sheath is not qualified, namely, a place with air leakage exists, the reading of the air tightness meter does not reach the set value, and the air tightness of the sheath is not qualified.
However, the method for detecting the airtightness of the sheath can only roughly judge whether the airtightness of the measured object meets the minimum standard, that is, when there are a plurality of measured objects meeting the minimum airtightness standard, the method cannot distinguish whether the airtightness of each of the plurality of measured objects meeting the minimum airtightness standard is good or bad, and cannot further distinguish the measured objects meeting the minimum airtightness standard according to the good or bad airtightness, and when the method is used for detecting the junction box, the same problem exists.
Disclosure of Invention
The invention aims to provide a device for detecting the air tightness of a high-voltage electric junction box, which solves the technical problem that the air tightness of the high-voltage electric junction box cannot be accurately detected in the prior art; the invention also aims to provide a high-voltage electrical junction box airtightness detection method capable of accurately detecting the airtightness of the high-voltage electrical junction box.
In order to achieve the purpose, the air tightness detection device of the high-voltage electric junction box adopts the following technical scheme:
a high-voltage electric junction box airtightness detection device comprises a vacuum controller, a vacuum generation device and a vacuum sensor, wherein the vacuum generation device and the vacuum sensor are connected with the vacuum controller, the vacuum generation device is used for being connected with a tested high-voltage electric junction box or a container hermetically connected with the tested high-voltage electric junction box to vacuumize the tested high-voltage electric junction box or the container, the vacuum sensor is used for measuring the vacuum degree in the tested high-voltage electric junction box or the container, the vacuum controller is provided with a first set value, a second set value and a third set value, the first set value, the second set value and the third set value are all set manually, the second set value, the third set value and the third set value are larger than or equal to the first set value, the vacuum controller is used for controlling the opening and closing of the vacuum generation device according to a vacuum degree signal of the vacuum sensor, the vacuum generation device is opened when the vacuum degree signal is smaller than the first, and recording the actual vacuum leakage time of the vacuum degree signal from the second set value to the third set value, wherein the first starting of the vacuum generating device is started along with the power supply of the detection device or the vacuum controller controls the starting according to the vacuum degree signal of the vacuum sensor.
According to the high-voltage electrical junction box airtightness detection device, the vacuum controller records the time for changing the vacuum degree of the detected high-voltage electrical junction box or the container from the second set value to the third set value to judge the airtightness degree of the high-voltage electrical junction box in the process of vacuumizing the high-voltage electrical junction box or the container hermetically connected with the detected high-voltage electrical junction box, wherein the time represents the vacuum leakage speed of the high-voltage electrical junction box, the time represents the airtightness degree of the high-voltage electrical junction box, the longer the time, the better the airtightness, the shorter the time, the worse the airtightness, and the like of each high-voltage electrical junction box can be accurately detected.
Further, in order to judge whether the detected high-voltage electric junction box meets the air tightness requirement, the vacuum controller is also provided with a standard vacuum leakage time for judging whether the detected high-voltage electric junction box meets the air tightness requirement, and the actual vacuum leakage time recorded by the standard vacuum leakage time can be compared with the standard vacuum leakage time to judge whether the detected high-voltage electric junction box meets the air tightness requirement.
Furthermore, in order to judge the air tightness of the high-voltage electric junction box more accurately, the vacuum controller is connected with a data transmission connector, and the data transmission connector is used for being connected with a background computer.
Further, in order to more effectively evacuate the high-voltage electrical junction box, the vacuum generating device is a vacuum pump.
In order to achieve the purpose, the air tightness detection method of the high-voltage electric junction box adopts the following technical scheme:
a method for detecting the airtightness of a high-voltage electric junction box comprises the following steps of ① vacuumizing the detected high-voltage electric junction box to a second set value, stopping vacuumizing, ② recording the actual vacuum leakage time when the vacuum degree in the high-voltage electric junction box is reduced to a third set value from the second set value, ③ performing ①② steps on the high-voltage electric junction box which is known to meet the airtightness requirement, setting the recorded vacuum leakage time as standard vacuum leakage time, and ④ comparing the actual vacuum leakage time of the detected high-voltage electric junction box with the standard vacuum leakage time to judge whether the airtightness of the detected high-voltage electric junction box meets the requirement.
The invention discloses a method for detecting the air tightness of a high-voltage electric junction box, which records the process of vacuumizing the high-voltage electric junction box or a container hermetically connected with the high-voltage electric junction box to be detected through a vacuum controller, the time for the vacuum sensor to detect that the vacuum degree in the high-voltage electrical junction box or the container to be detected is changed from the second set value to the third set value is used for judging the air tightness degree of the high-voltage electrical junction box, the time represents the vacuum leakage speed of the high-voltage electrical junction box, the air tightness degree of the high-voltage electric junction box is represented by the length of time, the longer the time is, the better the air tightness is, the shorter the time is, the worse the air tightness is, the air tightness degree of each high-voltage electric junction box can be accurately detected, and the actual vacuum leakage time of the detected high-voltage electric junction box can be compared with the standard vacuum leakage time, so that whether the air tightness of the detected high-voltage electric junction box meets the requirement or not can be judged.
Further, in order to improve the accuracy of the detection result, the step ①②③ is repeated at least once.
Drawings
Fig. 1 is a schematic composition diagram of an embodiment 1 of the airtightness detection apparatus for a high-voltage electrical junction box according to the present invention. In the figure: 1. a vacuum pump; 2. a brake hose; 3. a vacuum cylinder; 4. a high-voltage distribution box to be tested; 5. an absolute pressure sensor; 6. a vacuum controller; 7. and a data transmission joint.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Fig. 1 shows an embodiment 1 of the airtightness detection apparatus for a high-voltage electrical junction box according to the present invention, which includes a vacuum pump 1, a brake hose 2, a vacuum cylinder 3, an absolute pressure sensor 5, a vacuum controller 6, and a data transmission connector 7.
When the high-voltage electrical junction box airtightness detection device works, a vacuum pump 1 is started to pump air out of a vacuum cylinder 3 and a high-voltage distribution box 4 to be detected, a vacuum controller 6 receives a vacuum degree signal from an absolute pressure sensor 5, the vacuum pump 1 is closed when the vacuum degree signal is equal to a second set value of 20kPa, then when the vacuum degree signal changes from the second set value of 20kPa to a third set value of 25kPa, the actual vacuum leakage time of the vacuum degree signal changing from the second set value of 20kPa to the third set value of 25kPa is recorded, and the shorter the time is, the worse the airtightness of the high-voltage distribution box 4 to be detected is; the longer the time, the better the airtightness, and the vacuum pump is turned on when the vacuum degree signal received by the vacuum controller 6 is less than the first set value 40 kPa. And (4) carrying out cyclic detection for several times as required, and taking the actual vacuum leakage time recorded for many times as a basis for judging the air tightness of the high-voltage distribution box 4 to be detected. It is also possible to cycle only once and use the only actual vacuum leak time interval as the basis for the determination. And, can be according to the actual vacuum of record and reveal the length of time, carry out the classification of good or bad degree of leakproofness to the high voltage distribution box 4 that awaits measuring. The vacuum controller is also provided with a standard vacuum leakage time for judging whether the high-voltage distribution box 4 to be tested meets the air tightness requirement (the standard vacuum leakage time is the time for changing the vacuum degree from a second set value of 20kPa to a third set value of 25kPa when the air tightness of the high-voltage distribution box 4 to be tested which is known to meet the protection grade of parts and the practical application requirement is detected), and the recorded actual vacuum leakage time for changing the vacuum degree in the high-voltage distribution box 4 to be tested from the second set value of 20kPa to the third set value of 25kPa can be compared with the standard vacuum leakage time to judge whether the high-voltage distribution box 4 to be tested meets the air tightness requirement. And after the detection is finished, the power supply of the high-voltage electric junction box air tightness detection device is turned off, and the circulation is stopped.
The difference between the specific embodiment 2 of the high-voltage electrical junction box airtightness detection device and the embodiment 1 is that the vacuum cylinder 3 is not arranged, the absolute pressure sensor 5 is directly arranged on the high-voltage distribution box 4 to be detected, and the vacuum degree in the high-voltage distribution box 4 to be detected is directly detected.
The other embodiment of the high-voltage electrical junction box airtightness detection apparatus of the present invention is different from embodiment 1 in that no data transmission joint is provided. The vacuum pump may be replaced by other vacuum-pumping devices such as a vacuum generator. In other embodiments, the device for detecting the air tightness of the high-voltage electric junction box is also suitable for other high-voltage electric junction box bodies such as a motor controller junction box, a motor junction box, a junction box and the like.
The embodiment of the high-voltage electrical junction box airtightness detection method can be realized by adopting the device in the embodiment of the high-voltage electrical junction box airtightness detection device, and the steps comprise ① vacuumizing the high-voltage distribution box 4 to be detected to the second set value of 20kPa, stopping vacuumizing, ② recording the actual vacuum leakage time when the vacuum degree in the high-voltage distribution box 4 to be detected is reduced from the second set value of 20kPa to the third set value of 25kPa, ③ comparing the actual vacuum leakage time of the high-voltage distribution box 4 to be detected with the standard vacuum leakage time to judge whether the airtightness of the high-voltage distribution box 4 to be detected meets the requirement, and repeating the step ①②③ at least once in order to increase the accuracy of the detection result.
Taking a high-voltage distribution box (PDU) as an example, the test method specifically comprises the following steps:
setting a first set value to be 40kPa, a second set value to be 20kPa and a third set value to be 25kPa, ① vacuumizing the high-voltage distribution box 4 to be tested to 20kPa, stopping vacuumizing, ② recording the actual vacuum leakage time when the vacuum degree in the high-voltage distribution box 4 to be tested is reduced from 20kPa to 25kPa, ③ comparing the actual vacuum leakage time of the high-voltage distribution box 4 to be tested with the standard vacuum leakage time to judge whether the air tightness of the high-voltage distribution box 4 to be tested meets the requirement or not, and repeating the step ①②③ at least once in order to increase the accuracy of the detection result.
According to the experimental data in the table 1, the air tightness of the high-voltage distribution box is judged, and if the actual vacuum leakage time is greater than the standard vacuum leakage time, the air tightness of the high-voltage distribution box meets the requirement; and if the actual vacuum leakage time is less than the standard vacuum leakage time, the airtightness of the high-voltage distribution box is not met.
The air tightness test data of the high-voltage distribution box are shown in table 1:
TABLE 1
Claims (6)
1. The utility model provides a high-voltage electrical junction box gas tightness detection device, includes vacuum controller and the vacuum generating device, the vacuum sensor who is connected with vacuum controller, its characterized in that: the vacuum controller is used for controlling the opening and closing of the vacuum generating device according to a vacuum degree signal of the vacuum sensor, starting the vacuum generating device when the vacuum degree signal is smaller than the first set value, closing the vacuum generating device when the vacuum degree signal is equal to the second set value, and recording the actual vacuum leakage time of the vacuum degree signal from the second set value to the third set value, the first start of the vacuum generating device is started along with the power supply of the detection device or the vacuum controller controls the start according to the vacuum degree signal of the vacuum sensor.
2. The high-voltage electrical junction box airtightness detection apparatus according to claim 1, wherein: the vacuum controller is also provided with a standard vacuum leakage time for judging whether the tested high-voltage electrical junction box meets the air tightness requirement or not, and can compare the recorded actual vacuum leakage time with the standard vacuum leakage time to judge whether the tested high-voltage electrical junction box meets the air tightness requirement or not.
3. The high-voltage electrical junction box airtightness detection apparatus according to claim 1, wherein: the vacuum controller is connected with a data transmission connector, and the data transmission connector is used for being connected with a background computer.
4. The high-voltage electrical junction box airtightness detection apparatus according to claim 1, wherein: the vacuum generating device is a vacuum pump.
5. A method for detecting the airtightness of a high-voltage electric junction box is characterized by comprising the following steps of ① vacuumizing the detected high-voltage electric junction box to a second set value and stopping vacuumizing, ② recording the actual vacuum leakage time when the vacuum degree in the high-voltage electric junction box is reduced from the second set value to a third set value, and ③ comparing the actual vacuum leakage time of the detected high-voltage electric junction box with the standard vacuum leakage time to judge whether the airtightness of the detected high-voltage electric junction box meets the requirement or not.
6. The method of claim 5, wherein the step of ①②③ is repeated at least once.
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| US4683745A (en) * | 1986-08-28 | 1987-08-04 | Westvaco Corporation | Cannister seal integrity tester |
| WO1996014561A1 (en) * | 1994-11-04 | 1996-05-17 | Ab Volvo | A method and a device for testing the tightness of a closed container |
| CN102815288A (en) * | 2011-06-10 | 2012-12-12 | 北汽福田汽车股份有限公司 | Electronic vacuum pump control device, vacuum boosting system and vacuum boosting method |
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Application publication date: 20200417 |