CN111982497A - Positive and negative pressure test system and test method for pressure cover - Google Patents
Positive and negative pressure test system and test method for pressure cover Download PDFInfo
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- CN111982497A CN111982497A CN202010745797.3A CN202010745797A CN111982497A CN 111982497 A CN111982497 A CN 111982497A CN 202010745797 A CN202010745797 A CN 202010745797A CN 111982497 A CN111982497 A CN 111982497A
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- 238000012360 testing method Methods 0.000 title claims abstract description 82
- 238000010998 test method Methods 0.000 title claims abstract description 21
- 238000004088 simulation Methods 0.000 claims abstract description 74
- 238000002955 isolation Methods 0.000 claims abstract description 30
- 238000007789 sealing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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Abstract
The invention discloses a positive and negative pressure test system and a test method for a pressure cover, wherein the positive and negative pressure test system for the pressure cover comprises a positive pressure air source, a positive pressure controller, a pressure selection valve, an isolation valve, a positive pressure sensor, a vacuum generator, a negative pressure controller, a negative pressure sensor and a simulation box; the simulation box is provided with a cover opening matched with the pressure cover of the expansion box; the positive pressure air source, the positive pressure controller, the pressure selection valve, the isolation valve and the simulation box are sequentially communicated through a pipeline; the suction inlet of the vacuum generator, the negative pressure controller and the pressure selection valve are communicated in sequence through pipelines; the positive pressure sensor is communicated with the isolation valve and the simulation box through pipelines between the positive pressure test tube and the simulation box, and the negative pressure sensor is communicated with the isolation valve and the simulation box through pipelines between the negative pressure test tube and the simulation box. The positive and negative pressure testing system and the testing method for the pressure cover can test the positive and negative opening pressure values of the pressure cover of the expansion tank.
Description
Technical Field
The invention relates to the technical field of automobile part detection, in particular to a system and a method for testing positive and negative pressures of a pressure cover.
Background
The pressure cover of the expansion tank needs to be tested for the opening pressure of the relief valve after the preliminary assembly is completed, so that the pressure cover of the expansion tank which leaves the factory meets the requirement. When the pressure of the expansion tank pressure cover in the expansion tank is higher than a certain high air pressure value, a release valve of the expansion tank pressure cover needs to be opened so that the expansion tank can be outwardly decompressed; when the pressure in the expansion tank is less than a certain low pressure value, the release valve of the pressure cover of the expansion tank should be opened so that the expansion tank can suck the outside air. The existing pressure cover opening pressure testing method usually adopts a plurality of manual operation procedures, positive pressure and negative pressure are respectively added, human body perception relief valve air flow is used for judging the quality, the error is large, the testing value cannot be quantized, and the productivity is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a positive and negative pressure testing system for a pressure cover, which can test the positive and negative opening pressure values of the pressure cover of an expansion tank; the invention also aims to provide a positive pressure test method of the positive and negative pressure test system of the pressure cover, which can test the opening pressure value of the pressure cover of the expansion tank under positive pressure; the invention also aims to provide a negative pressure test method of the positive and negative pressure test system of the pressure cover, which can test the opening pressure value of the pressure cover of the expansion tank during negative pressure.
The purpose of the invention is realized by adopting the following technical scheme:
a pressure cap positive and negative pressure test system comprising: the device comprises a positive pressure air source, a positive pressure controller, a pressure selection valve, an isolation valve, a positive pressure sensor, a vacuum generator, a negative pressure controller, a negative pressure sensor and a simulation box; the simulation box is provided with a cover opening matched with the pressure cover of the expansion box; the positive pressure air source, the positive pressure controller, the pressure selection valve, the isolation valve and the simulation box are sequentially communicated through a pipeline; the suction inlet of the vacuum generator, the negative pressure controller and the pressure selection valve are communicated in sequence through pipelines; the positive pressure sensor pass through the positive pressure test pipe with pipeline intercommunication between isolation valve and the simulation case, negative pressure sensor pass through the negative pressure test pipe with pipeline intercommunication between isolation valve and the simulation case.
Further, the positive and negative pressure testing system of the pressure cover further comprises a negative pressure source switch valve; and the positive pressure air source, the negative pressure source switch valve and the air inlet end of the vacuum generator are communicated in sequence through pipelines.
Furthermore, a positive pressure test selection valve is arranged on the positive pressure test pipe.
Furthermore, a negative pressure test selection valve is arranged on the negative pressure test pipe.
Furthermore, a sealing cover is arranged on the simulation box and is suitable for covering the cover opening, and a rear end pressure sensor is arranged in the sealing cover.
A positive pressure test method comprising the steps of:
fixing the pressure cover of the expansion tank on the cover opening, pressurizing the inside of the simulation tank through a positive pressure gas source to enable the pressure in the simulation tank to be higher than the positive opening pressure of the pressure cover of the expansion tank, and then closing the isolation valve to maintain the pressure;
acquiring pressure change in the simulation box body through a positive pressure sensor;
when the pressure loss in 30s is less than or equal to 1KPa, capturing the pressure value of the last second in the 30s, and marking the pressure value as the positive opening pressure of the pressure cover of the expansion tank;
and judging whether the positive opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
A positive pressure test method comprising the steps of:
fixing the pressure cover of the expansion tank on the cover opening, and pressurizing the interior of the simulation tank by a positive pressure gas source at a first speed to be lower than the positive opening pressure of the pressure cover of the expansion tank by adjusting a positive pressure controller;
the positive pressure gas source is enabled to continuously pressurize the interior of the simulation box at a second speed by adjusting the positive pressure controller, and the first speed is greater than the second speed;
when the rear-end pressure sensor detects that the pressure in the seal box reaches a preset value, capturing the value of the positive pressure sensor at the same moment, and marking the value as the positive opening pressure of the pressure cover of the expansion box;
and judging whether the positive opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
A negative pressure test method comprises the following steps:
fixing the pressure cover of the expansion tank on the cover opening, exhausting air in the simulation tank through a vacuum generator to enable the pressure in the simulation tank to be lower than the negative opening pressure of the pressure cover of the expansion tank, and then closing the isolation valve to maintain pressure;
acquiring pressure change in the simulation box body through a negative pressure sensor;
when the pressure loss in 30s is less than or equal to 0.1KPa, capturing the pressure value of the last second in the 30s, and marking the pressure value as the negative opening pressure of the pressure cover of the expansion tank;
and judging whether the negative opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
A negative pressure test method comprises the following steps:
fixing the pressure cover of the expansion tank on the cover opening, and enabling a vacuum generator to pump air into the simulation tank at a first speed to be higher than the negative opening pressure of the pressure cover of the expansion tank by adjusting a negative pressure controller;
the vacuum generator continues to pump air into the simulation box at a second speed by adjusting the negative pressure controller, and the first speed is greater than the second speed;
when the rear-end pressure sensor detects that the pressure in the seal box reaches a preset value, capturing the value of the negative pressure sensor at the same moment, and marking the value as the negative opening pressure of the pressure cover of the expansion box;
and judging whether the negative opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the positive and negative pressure testing system for the pressure cover, the positive and negative opening pressures of the pressure cover of the expansion tank can be accurately tested through the pipeline connection among the simulation tank, the positive pressure air source, the vacuum generator, the positive pressure controller, the negative pressure sensor and the positive pressure sensor, so that people can conveniently screen unqualified pressure covers of the expansion tank, and the ex-factory qualification rate of the pressure covers of the expansion tank is ensured.
(2) The positive pressure testing method can accurately test the positive opening pressure of the pressure cover of the expansion tank, and can also quickly test the positive opening pressure of the pressure cover of the expansion tank in batches.
(3) The negative pressure testing method can accurately test the negative opening pressure of the pressure cover of the expansion tank, and can also quickly test the negative opening pressure of the pressure cover of the expansion tank in batches.
Drawings
FIG. 1 is a schematic diagram of a positive and negative pressure test system for a pressure cap according to the present invention.
FIG. 2 is a graph of pressure versus time for the positive pressure test method of the present invention;
FIG. 3 is another graph of pressure versus time for the positive pressure test method of the present invention;
FIG. 4 is a graph of pressure versus time for the negative pressure test method of the present invention;
FIG. 5 is another graph of pressure versus time for the negative pressure test method of the present invention.
In the figure: 1. a simulation box; 11. covering the opening; 2. a positive pressure gas source; 211. an isolation valve; 212. a positive pressure controller; 3. a vacuum generator; 311. a negative pressure controller; 321. a negative pressure source switch valve; 4. a positive pressure sensor; 5. a negative pressure sensor; 6. a positive pressure test tube; 61. a positive pressure test selection valve; 7. a negative pressure test tube; 71. a negative pressure test selection valve; 8. a pressure selection valve; 9. a sealing cover; 91. a rear end pressure sensor.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a positive/negative pressure testing system for a pressure cover according to an embodiment of the present invention is shown, and includes at least: a positive pressure air source 2, a positive pressure controller 212, a pressure selection valve 8, an isolation valve 211, a positive pressure sensor 4, a vacuum generator 3, a negative pressure controller 311, a negative pressure sensor 5 and a simulation box 1; the simulation box 1 is provided with a cover opening 11 matched with the pressure cover of the expansion box; the positive pressure gas source 2, the positive pressure controller 212, the pressure selection valve 8, the isolation valve 211 and the simulation box 1 are sequentially communicated through a pipeline; the suction inlet of the vacuum generator 3, the negative pressure controller 311 and the pressure selection valve 8 are communicated in sequence through pipelines; positive pressure sensor 4 through positive pressure test tube 6 with pipeline intercommunication between isolation valve 211 and the simulation case 1, negative pressure sensor 5 through negative pressure test tube 7 with pipeline intercommunication between isolation valve 211 and the simulation case 1. The isolation valve 211 plays a role of on-off, the positive pressure controller 212 and the negative pressure controller 311 are used for controlling the ventilation rate, and the pressure selection valve 8 plays a role of reversing.
Preferably, the pressure cover positive and negative pressure test system further comprises a negative pressure source switch valve 321; the positive pressure air source 2, the negative pressure switch valve 321 and the air inlet end of the vacuum generator 3 are communicated in sequence through pipelines. That is, in the present invention, the vacuum generator 3 can be driven by the same positive pressure air source 2, so that the system is simpler and the cost is saved. In addition, it should be noted that, when positive pressure is required in the simulation box 1, the pressure selection valve 8 should be in a working state at this time that only the positive pressure air source 2 is switched on, the vacuum generator 3 is blocked, and the negative pressure source switch valve 321 is closed at this time; when negative pressure is required in the simulation tank 1, the pressure selection valve 8 should be operated in such a state that only the vacuum generator 3 is turned on and the negative pressure source switching valve 321 is opened.
Preferably, the positive pressure test pipe 6 is provided with a positive pressure test selection valve 61; the positive pressure test selection valve 61 is used to open and close the positive pressure test tube 6. A negative pressure test selection valve 71 is arranged on the negative pressure test tube 7; the negative pressure test selection valve 71 is used for switching the negative pressure test tube 7 on and off. By the arrangement mode, when the simulation box 1 needs to be pressurized, only the positive pressure test selection valve 61 can be opened, and the negative pressure test selection valve 71 can be closed, so that damage to the negative pressure sensor is avoided. Similarly, when the simulation box 1 needs to be evacuated, only the negative pressure test selection valve 71 can be opened, and the positive pressure test selection valve 61 can be closed, so that the positive pressure sensor is prevented from being damaged.
Preferably, a sealing cover 9 is arranged on the simulation box 1, the sealing cover 9 is suitable for covering the cover opening 11, and a rear end pressure sensor 91 is arranged in the sealing cover 9. Specifically, the sealing cover 9 can move up and down through the air cylinder, so as to open or cover the cover opening 11.
Through foretell setting mode, can make things convenient for tester's accuracy carry out the test of positive negative opening pressure to expansion tank pressure lid. The following are used specifically:
when the positive opening pressure of the pressure cover of the expansion tank needs to be accurately tested, the pressure cover of the expansion tank needs to be screwed on the cover opening 11 of the simulation tank 1, then the positive pressure air source 2 and the positive pressure controller 212 are started (at this time, the vacuum generator 3, the negative pressure source switch valve 321 and the negative pressure controller 311 are all in a closed state, the pressure selection valve 8 is selected to be communicated with the positive pressure air source 2, the isolation valve 211 is opened), the simulation box 1 is pressurized by the positive pressure air source 2 and is pressurized until the pressure is higher than the positive opening pressure of the pressure cover of the expansion box, then the isolation valve 211 is closed, at this time, the high pressure in the simulation tank 1 can be released only through the pressure cover of the expansion tank, and the pressure in the expansion tank pressure cover can be detected by the positive pressure sensor 4, and the tester can calculate the positive opening pressure of the expansion tank cover according to the pressure change value detected by the positive pressure sensor 4, which is specifically as follows: and when the pressure loss in 30s is less than or equal to 1KPa, marking the pressure in the last second in the 30s as the positive opening pressure of the pressure cover of the expansion tank.
When the negative opening pressure of the expansion tank pressure cover needs to be accurately tested, the expansion tank pressure cover needs to be screwed on the cover opening 11 of the simulation tank 1, then the positive pressure air source 2, the negative pressure source switch valve 321, the vacuum generator 3 and the negative pressure controller 311 need to be opened (at this time, the positive pressure controller 212 is in a closed state, the pressure selection valve 8 is selectively communicated with the vacuum generator 3, and the isolation valve 211 is opened), air is sucked into the simulation tank 1 through the vacuum generator 3 until the air is sucked below the negative opening pressure of the expansion tank pressure cover, then the isolation valve 211 is closed, at this time, the pressure in the simulation tank 1 can only be balanced with the outside through the expansion tank pressure cover, the pressure in the expansion tank pressure cover can be detected by the negative pressure sensor 5, a tester can calculate the positive opening pressure of the expansion tank cover according to the pressure change detected by the negative pressure sensor 5, the method comprises the following specific steps: and when the pressure loss in 30s is less than or equal to 1KPa, marking the pressure in the last second in 30s as the negative opening pressure of the pressure cover of the expansion tank.
Through foretell mode of setting up, can also make things convenient for the tester quick carry out the test of positive negative opening pressure to expansion tank pressure lid, in the time of can be fine being applicable to batch test. The following are used specifically:
when the positive opening pressure of the pressure cover of the expansion tank needs to be tested quickly, the pressure cover of the expansion tank needs to be screwed on the cover opening 11 of the simulation tank 1, the sealing cover 9 covers the cover opening 11, then the positive pressure air source 2 and the positive pressure controller 212 are started (at this time, the vacuum generator 3, the negative pressure source switch valve 321 and the negative pressure controller 311 are all in a closed state, the pressure selection valve 8 is selected to be communicated with the positive pressure air source 2, and the isolation valve 211 is opened), and the positive pressure air source 2 is enabled to pressurize the interior of the simulation tank 1 to be below the positive opening pressure of the pressure cover of the expansion tank at a first rate (namely, the positive opening pressure of the pressure cover of the expansion tank is not reached yet) by adjusting the positive pressure controller 212. Then, by adjusting the positive pressure controller 212, the positive pressure source 2 continues to pressurize the simulation tank 1 at the second rate, and the first rate is greater than the second rate during the pressurizing process, which saves time. When the rear end pressure sensor 91 detects that the pressure in the seal box reaches a preset value, the value of the positive pressure sensor 4 at the same time is captured and marked as the positive opening pressure of the pressure cover of the expansion box. It should be noted that the pressure in the sealed tank reaches a preset value, which indicates that the pressure cover of the expansion tank leaks, i.e. the pressure in the simulation tank 1 reaches its opening pressure.
When the negative opening pressure of the expansion tank pressure cover needs to be tested quickly, the expansion tank pressure cover needs to be screwed on the cover opening 11 of the simulation tank 1, the sealing cover 9 covers the cover opening 11, then the positive pressure air source 2, the negative pressure source switch valve 321, the vacuum generator 3 and the negative pressure controller 311 are opened (at this time, the positive pressure controller 212 is in a closed state, the pressure selection valve 8 is selected to be communicated with the vacuum generator 3, and the isolation valve 211 is opened), and the vacuum generator 3 pressurizes the inside of the simulation tank 1 to be higher than the negative opening pressure of the expansion tank pressure cover at a first rate (namely, the negative opening pressure of the expansion tank pressure cover is not reached yet) by adjusting the negative pressure controller 311. Then, the vacuum generator 3 continues to pump air into the simulation tank 1 at the second rate by adjusting the negative pressure controller 311, and the first rate is greater than the second rate during the pumping process. When the rear end pressure sensor 91 detects that the pressure in the seal box reaches a preset value, the value of the negative pressure sensor 5 at the same time is captured and marked as the negative opening pressure of the pressure cover of the expansion box. It should be noted that the pressure in the sealed tank reaches the preset value, which indicates that the pressure cover of the expansion tank is opened, i.e. the pressure in the simulation tank 1 reaches the opening pressure.
The embodiment discloses a positive pressure test method of the positive and negative pressure test system for the pressure cover, which comprises the following steps: fixing the pressure cover of the expansion tank on the cover opening 11, pressurizing the inside of the simulation tank 1 by a positive pressure air source 2 to enable the pressure in the simulation tank 1 to be higher than the positive opening pressure of the pressure cover of the expansion tank (for example 160KPa), and then closing the isolation valve 211 to maintain the pressure; acquiring pressure change in the simulation tank 1 through a positive pressure sensor 4 and obtaining a pressure/time diagram, as shown in fig. 2, when pressure loss in 30s is less than or equal to 1KPa, capturing the pressure value of the last second in the 30s, and marking the pressure value as the positive opening pressure of the pressure cover of the expansion tank; and judging whether the positive opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified. The positive opening pressure of the pressure cover of the expansion tank can be accurately tested by the testing mode.
The embodiment also discloses another positive pressure test method of the positive and negative pressure test system for the pressure cover, which comprises the following steps: fixing the pressure cover of the expansion tank on the cover opening 11, and pressurizing the interior of the simulation tank 1 by a positive pressure gas source 2 at a first rate to be lower than the positive opening pressure of the pressure cover of the expansion tank (for example, 120KPa) by adjusting a positive pressure controller 212; the positive pressure air source 2 continues to pressurize the simulation box 1 at a second rate by adjusting the positive pressure controller 212, and the first rate is greater than the second rate; referring to fig. 3, when the rear end pressure sensor 91 detects that the pressure in the seal box reaches a preset value (for example, 0.5KPa), the value of the positive pressure sensor 4 at the same time is captured and marked as the positive opening pressure of the pressure cover of the expansion box; and judging whether the positive opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified. The positive opening pressure of the pressure cover of the expansion tank can be quickly tested by the testing mode.
The embodiment discloses a negative pressure test method of the positive and negative pressure test system for the pressure cover, which comprises the following steps: fixing the pressure cover of the expansion tank on the cover opening 11, exhausting air in the simulation tank 1 through the vacuum generator 3 to enable the pressure in the simulation tank 1 to be lower than the negative opening pressure of the pressure cover of the expansion tank (for example, -12KPa), and then closing the isolation valve 211 to maintain pressure; acquiring pressure change in the simulation tank 1 through a negative pressure sensor 5 and obtaining a pressure/time diagram, capturing the pressure value of the last second in 30s when the pressure loss in 30s is less than or equal to 0.1KPa as shown in figure 4, and marking the pressure value as the negative opening pressure of the pressure cover of the expansion tank; and judging whether the negative opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified. The testing mode can accurately test the negative opening pressure of the pressure cover of the expansion tank.
The embodiment also discloses another negative pressure test method of the positive and negative pressure test system of the pressure cover, which comprises the following steps: fixing the pressure cover of the expansion tank on the cover opening 11, and enabling the vacuum generator 3 to pump air into the simulation tank 1 at a first speed to be higher than the negative opening pressure of the pressure cover of the expansion tank (for example, -1KPa) by adjusting the negative pressure controller 311; the vacuum generator 3 continues to pump air into the simulation box 1 at a second speed by adjusting the negative pressure controller 311, and the first speed is greater than the second speed; referring to fig. 5, when the rear end pressure sensor 91 detects that the pressure in the seal box reaches a preset value (for example, -0.5KPa), the value of the negative pressure sensor 5 at the same time is captured and marked as the negative opening pressure of the pressure cover of the expansion box; and judging whether the negative opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified. The testing mode can quickly test the negative opening pressure of the pressure cover of the expansion tank.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A positive and negative pressure test system for a pressure cap, comprising: the device comprises a positive pressure air source, a positive pressure controller, a pressure selection valve, an isolation valve, a positive pressure sensor, a vacuum generator, a negative pressure controller, a negative pressure sensor and a simulation box; the simulation box is provided with a cover opening matched with the pressure cover of the expansion box; the positive pressure air source, the positive pressure controller, the pressure selection valve, the isolation valve and the simulation box are sequentially communicated through a pipeline; the suction inlet of the vacuum generator, the negative pressure controller and the pressure selection valve are communicated in sequence through pipelines; the positive pressure sensor pass through the positive pressure test pipe with pipeline intercommunication between isolation valve and the simulation case, negative pressure sensor pass through the negative pressure test pipe with pipeline intercommunication between isolation valve and the simulation case.
2. The pressure cap positive and negative pressure test system of claim 1, further comprising a negative pressure source switch valve; and the positive pressure air source, the negative pressure source switch valve and the air inlet end of the vacuum generator are communicated in sequence through pipelines.
3. The positive and negative pressure test system for pressure caps of claim 1, wherein the positive pressure test tube is provided with a positive pressure test selection valve.
4. The pressure cap positive and negative pressure test system of claim 1, wherein the negative pressure test tube is provided with a negative pressure test selection valve.
5. The positive and negative pressure test system for pressure caps of claim 1, wherein the dummy box is provided with a sealing cover adapted to cover the cap opening, and a rear pressure sensor is provided in the sealing cover.
6. A positive pressure test method of the positive and negative pressure test system of the pressure cover as claimed in any one of claims 1 to 4, comprising the steps of:
fixing the pressure cover of the expansion tank on the cover opening, pressurizing the inside of the simulation tank through a positive pressure gas source to enable the pressure in the simulation tank to be higher than the positive opening pressure of the pressure cover of the expansion tank, and then closing the isolation valve to maintain the pressure;
acquiring pressure change in the simulation box body through a positive pressure sensor;
when the pressure loss in 30s is less than or equal to 1KPa, capturing the pressure value of the last second in the 30s, and marking the pressure value as the positive opening pressure of the pressure cover of the expansion tank;
and judging whether the positive opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
7. A positive pressure test method of the positive and negative pressure test system of the pressure cap as claimed in claim 5, comprising the steps of:
fixing the pressure cover of the expansion tank on the cover opening, and pressurizing the interior of the simulation tank by a positive pressure gas source at a first speed to be lower than the positive opening pressure of the pressure cover of the expansion tank by adjusting a positive pressure controller;
the positive pressure gas source is enabled to continuously pressurize the interior of the simulation box at a second speed by adjusting the positive pressure controller, and the first speed is greater than the second speed;
when the rear-end pressure sensor detects that the pressure in the seal box reaches a preset value, capturing the value of the positive pressure sensor at the same moment, and marking the value as the positive opening pressure of the pressure cover of the expansion box;
and judging whether the positive opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
8. A negative pressure test method of the positive and negative pressure test system of the pressure cover as claimed in any one of claims 1 to 4, comprising the steps of:
fixing the pressure cover of the expansion tank on the cover opening, exhausting air in the simulation tank through a vacuum generator to enable the pressure in the simulation tank to be lower than the negative opening pressure of the pressure cover of the expansion tank, and then closing the isolation valve to maintain pressure;
acquiring pressure change in the simulation box body through a negative pressure sensor;
when the pressure loss in 30s is less than or equal to 0.1KPa, capturing the pressure value of the last second in the 30s, and marking the pressure value as the negative opening pressure of the pressure cover of the expansion tank;
and judging whether the negative opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
9. A negative pressure test method of the positive and negative pressure test system of the pressure cover as claimed in claim 5, comprising the steps of:
fixing the pressure cover of the expansion tank on the cover opening, and enabling a vacuum generator to pump air into the simulation tank at a first speed to be higher than the negative opening pressure of the pressure cover of the expansion tank by adjusting a negative pressure controller;
the vacuum generator continues to pump air into the simulation box at a second speed by adjusting the negative pressure controller, and the first speed is greater than the second speed;
when the rear-end pressure sensor detects that the pressure in the seal box reaches a preset value, capturing the value of the negative pressure sensor at the same moment, and marking the value as the negative opening pressure of the pressure cover of the expansion box;
and judging whether the negative opening pressure is in a qualified range, if so, indicating that the pressure cover of the expansion tank is qualified, and if not, indicating that the pressure cover of the expansion tank is unqualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010745797.3A CN111982497A (en) | 2020-07-29 | 2020-07-29 | Positive and negative pressure test system and test method for pressure cover |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010745797.3A CN111982497A (en) | 2020-07-29 | 2020-07-29 | Positive and negative pressure test system and test method for pressure cover |
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| CN111982497A true CN111982497A (en) | 2020-11-24 |
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| CN202010745797.3A Pending CN111982497A (en) | 2020-07-29 | 2020-07-29 | Positive and negative pressure test system and test method for pressure cover |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625602A (en) * | 2023-07-20 | 2023-08-22 | 宁波市中博汽车科技有限公司 | Automatic airtight detector for pressure cover |
-
2020
- 2020-07-29 CN CN202010745797.3A patent/CN111982497A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625602A (en) * | 2023-07-20 | 2023-08-22 | 宁波市中博汽车科技有限公司 | Automatic airtight detector for pressure cover |
| CN116625602B (en) * | 2023-07-20 | 2023-10-27 | 宁波市中博汽车科技有限公司 | Automatic airtight detector for pressure cover |
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Country or region after: China Address after: Room 101, Building 1, Room 201, No. 19 Yunpu 1st Road, Huangpu District, Guangzhou City, Guangdong Province, 510000 Applicant after: UPTON AUTOMATION SYSTEMS (GUANGZHOU) Co.,Ltd. Address before: 510000 Room 106, Building 728 Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Applicant before: UPTON AUTOMATION SYSTEMS (GUANGZHOU) Co.,Ltd. Country or region before: China |