CN116678566A - Air tightness testing method and system - Google Patents

Abstract

The application relates to an air tightness test method and system. The air tightness test method comprises a plurality of steps: carrying out negative pressure operation on at least one object to be tested through an air hole of the at least one object to be tested, and reducing the pressure inside the at least one object to be tested to preset air pressure so as to have air pressure difference with the outside of the at least one object to be tested, wherein the air pressure difference corresponds to the depth of water defined by the waterproof test grade; after the interior of at least one object to be measured is depressurized to a preset air pressure, measuring the air pressure of the interior of at least one object to be measured; calculating an estimated leakage amount according to the measured air pressure and the preset air pressure; and comparing the estimated leakage amount with a preset standard leakage amount to obtain a result of the air tightness test.

Description

Air tightness testing method and system

technical field

The present application relates to the technical field of air tightness testing, in particular to an air tightness testing method and system.

Background technique

For an outdoor product, it usually needs to reach a certain waterproof level. If the waterproof function fails, it will cause problems such as rust, circuit short circuit, burned circuit board, and battery explosion. Therefore, waterproof testing is a common method for testing the waterproof performance of products. method, but for products that require 100% factory inspection, this method may not be applicable, because to determine the success or failure of the waterproof test, the case needs to be disassembled for judgment. The state after assembly is different from the previous state, so it cannot meet the requirements of 100% factory inspection.

Contents of the invention

Based on this, it is necessary to provide an airtightness test method and system that can replace the waterproof test to detect the airtightness of the product.

According to one aspect of the present application, a kind of air tightness testing method is provided, comprising:

Negative pressure operation is performed on the at least one test object through the air hole of the at least one test object, so that the inside of the at least one test object is decompressed to a preset air pressure so as to have an air pressure with the outside of the at least one test object difference, wherein the air pressure difference corresponds to the depth of water defined by the waterproof test level;

After the interior of the at least one object to be tested is depressurized to the preset air pressure, measuring the measured air pressure inside the at least one object to be tested;

calculating an estimated leakage amount according to the measured air pressure and the preset air pressure; and

The estimated leakage amount is compared with the preset standard leakage amount to obtain the result of the airtightness test.

In one of the embodiments, the performing negative pressure operation on the at least one object under test includes:

extracting gas corresponding to the pressure difference from the interior of the at least one analyte within a first period of time; and

The internal air pressure of the at least one object under test is maintained at the preset air pressure during a second time period later than the first time period.

In one of the embodiments, it also includes

Calculate the air pressure difference according to the water depth, the density of the water and the acceleration of gravity; and

The preset air pressure is obtained by subtracting the air pressure difference from the external ambient air pressure of the at least one analyte.

In one of the embodiments, the quantity of the at least one test object is multiple, and the air tightness testing method also includes:

When the estimated leakage amount is greater than the preset standard leakage amount, each of the at least one DUT is used as a target object, and the following steps are executed:

performing the negative pressure operation on the target through the air holes of the target, so that the interior of the target is decompressed to the preset air pressure;

measuring another measured air pressure inside the target object after the inside of the target object is decompressed to the preset air pressure;

calculating another estimated leakage amount according to the other measured air pressure and the preset air pressure; and

Comparing the another estimated leakage amount with another preset standard leakage amount to obtain another result of the air tightness test.

In one of the embodiments, the preset standard leakage amount is positively correlated with the quantity of the at least one analyte.

According to another aspect of the present application, an airtightness testing system is provided, comprising:

a connecting device for connecting to at least one air hole of the object to be tested; and

An air-tight instrument, connected to the connection device, is used to use a gas source to carry out negative pressure operation on the at least one test object to a preset air pressure through the connection device so that the interior of the at least one test object is in contact with the connection device. There is an air pressure difference outside the at least one object to be tested, and after the inside of the at least one object to be tested is decompressed to the preset air pressure, the measurement of the interior of the at least one object to be tested is measured Air pressure, calculating an estimated leakage amount according to the measured air pressure and the preset air pressure, and comparing the estimated leakage amount with a preset standard leakage amount to obtain the result of the air tightness test;

Wherein, the air pressure difference corresponds to the water depth defined by the waterproof test level.

In one of the embodiments, the air tightness device is used to extract gas corresponding to the pressure difference from the inside of the at least one object under test within a first period of time, and later than the first period of time maintaining the internal air pressure of the at least one analyte at the preset air pressure during the second period of time.

In one of the embodiments, the preset air pressure is the external ambient air pressure minus the air pressure difference of the at least one object under test, and the air pressure difference is based on the water depth, water density and gravitational acceleration calculated.

In one of the embodiments, the quantity of the at least one object to be tested is multiple, and the air tightness instrument is also used to release the at least Each of a DUT is used as a target object, and the execution:

performing the negative pressure operation on the target through the air holes of the target, so that the interior of the target is decompressed to the preset air pressure;

measuring another measured air pressure inside the target object after the inside of the target object is decompressed to the preset air pressure;

calculating another estimated leakage amount according to the other measured air pressure measured by the airtight meter and the preset air pressure; and

Comparing the another estimated leakage amount with another preset standard leakage amount to obtain another result of the air tightness test.

In one of the embodiments, the quantity of the at least one analyte is positively correlated with the preset standard leakage amount.

The above-mentioned airtightness test method and system can decompress at least one object to be tested in the way of negative pressure operation, obtain the airtightness test result by comparing the estimated leakage amount with the preset standard leakage amount, and complete the airtightness test. Therefore, it can replace the waterproof test to achieve the purpose of detecting the airtightness of the product. In addition, compared with the general waterproof test, which needs to disassemble the casing to determine the waterproofness, the airtightness test method and system disclosed in this case can use the comparison between the air pressure leakage and the preset standard leakage to obtain the test of the airtightness of the product As a result, 100% inspection of shipments can be achieved, and the cost of testing time and scrapping of test products can be greatly reduced.

The above descriptions of the disclosure and the following descriptions of the embodiments are used to demonstrate and explain the spirit and principle of the present invention, and provide further explanations of the scope of the claims of the present invention.

Description of drawings

FIG. 1 is a functional block diagram of an airtightness testing system in an embodiment of the present application.

Fig. 2 is a flowchart of an airtightness testing method in an embodiment of the present application.

FIG. 3 is a flow chart of the negative pressure operation steps of the airtightness test method in an embodiment of the present application.

FIG. 4 is a flow chart of steps of obtaining a preset air pressure in an airtightness testing method according to another embodiment of the present application.

Fig. 5 is a flowchart of an airtightness testing method in another embodiment of the present application.

Brief description of component symbols:

1: Air tightness test system

11: Connection device

12: Air tightness instrument

111: connector

112: Adapter

2: The object to be tested

21: Connection end

S101, S103, S105, S107, S201, S203, S301, S303, S401, S403, S405, S407: steps

Detailed ways

The detailed features and advantages of the present invention are described in detail below in the embodiments, the content of which is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the scope of claims and the accompanying drawings , any person skilled in the art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the concept of the present invention in detail, but do not limit the scope of the present invention in any way.

Please refer to FIG. 1 , which shows a functional block diagram of an airtightness testing system in an embodiment of the present application. As shown in FIG. 1 , the airtightness test system 1 includes a connecting device 11 and an airtight instrument 12 , wherein the connecting device 11 may include a connecting head 111 and an adapter 112 . For example, the air tightness instrument 12 can be connected to the object under test 2 through the connection end 21 through the connection head 111 and the adapter 112 or connected to the object under test 2 through the connection end 21 through the pipeline.

The connecting device 11 is used for connecting the air tightness instrument 12 and the object 2 to be tested. For example, the connection device 11 may be a connector and adapter, a pipeline or any device capable of transmitting gas.

The air tightness instrument 12 is used to use a gas source (such as an air compressor) to carry out negative pressure operations on the object 2 to be tested to a preset air pressure so that there is a pressure difference between the inside of the object to be tested 2 and the outside of the object to be tested 2, and is used to measure The air pressure inside the object under test 2 is estimated to obtain the result of the airtightness test. For example, the air tightness instrument 12 may include a pressure controller, a flow meter, a pressure sensor, a timer, and one or more processors, wherein the processor may be used to control the operation of the entire testing process or perform processing and calculations operation, such as a central processing unit, a microcontroller, a programmable logic controller, other processors with arithmetic processing functions, or a combination thereof.

The connection head 111 is used to connect the object under test 2 and the adapter 112 through the connection end 21 on the object under test 2 . For example, the connector 111 may be a connector with threads.

The adapter 112 is used to realize the connection between the airtight instrument 12 and the connection head 111 . For example, the adapter 112 may be a pipe thread adapter.

Please refer to FIG. 2 , wherein FIG. 2 shows a flowchart of an airtightness testing method in an embodiment of the present application. As shown in Figure 2, the airtightness testing method includes step S101: performing a negative pressure operation on at least one object to be tested through the air hole of at least one object to be tested, so that the interior of at least one object to be tested is decompressed to a preset air pressure to be consistent with There is an air pressure difference on the outside of at least one test object, wherein the air pressure difference corresponds to the water depth defined by the waterproof test level; Step S103: after the inside of the at least one test object is decompressed to a preset air pressure, measure at least one test object The measured air pressure inside the object; step S105: calculate the estimated leakage amount according to the measured air pressure and the preset air pressure; and step S107: compare the estimated leakage amount with the preset standard leakage amount to obtain the result of the airtightness test .

In step S101, the air tightness instrument 12 performs a negative pressure operation on at least one object to be tested 2 through the air hole of at least one object to be tested 2, so that the interior of at least one object to be tested 2 is depressurized to a preset pressure to be compatible with at least one object to be tested. There is an air pressure difference outside the object 2. Specifically, the air pressure difference corresponds to the depth of water defined by the waterproof test level. For example, the waterproof pressure defined by the waterproof test level IP65 or IP67 is the water depth pressure of 1 meter, and the corresponding air pressure difference is 10kPa.

In step S103 , the air-tight instrument 12 measures the measured air pressure inside the at least one object 2 after the inside of the at least one object 2 is depressurized to a preset air pressure. Specifically, after the air tightness instrument 12 depressurizes the inside of the object 2 to the preset air pressure, it will wait for a preset time before measuring the measured air pressure inside the object 2, wherein the preset time is, for example, 10 seconds. For example, the preset air pressure may be 90 kPa obtained by reducing the atmospheric pressure of 100 kPa to a pressure difference of 10 kPa.

In step S105, the air tightness instrument 12 calculates an estimated leakage amount according to the measured air pressure and the preset air pressure. Specifically, the air tightness instrument 12 uses the pressure difference value between the measured air pressure and the preset air pressure as an estimated leakage amount.

In step S107 , the airtightness tester 12 compares the estimated leakage amount with the preset standard leakage amount to obtain the result of the airtightness test. Specifically, the preset standard leakage amount corresponds to the acceptable leakage amount of the object under test 2 , and the preset standard leakage amount is positively correlated with the quantity of at least one object under test 2 . In addition, the preset standard leakage amount can also be related to the waterproof test level. Specifically, the higher the waterproof level defined corresponding to the waterproof test level, the lower the preset standard leakage. According to the results of the airtightness test, whether the estimated leakage amount does not exceed the preset standard leakage amount according to the comparison may correspond to whether the waterproof level defined by the waterproof test level is passed or not. For example, the preset standard leakage can be 2% of the aforementioned air pressure difference of 10kPa, that is, 200Pa, and when the estimated leakage does not exceed 200Pa, it means passing the waterproof test level IP65.

In order to further illustrate step S101, please refer to FIG. 2 and FIG. 3 together, wherein FIG. 3 shows a flow chart of the negative pressure operation steps of the airtightness testing method in an embodiment of the present application.

As shown in FIG. 3 , step S101 of FIG. 2 may include step S201: extracting gas corresponding to the pressure difference from the inside of at least one object under test within a first period; The air pressure inside at least one object to be tested is maintained at a preset air pressure during the time period.

In step S201 , the airtight device 12 pumps out gas corresponding to the pressure difference from the inside of the object under test 2 within a first period of time. Specifically, during the first period of time, the gas-tight device 12 will continue to pump out gas from the inside of the object under test 2 until the preset air pressure is reached. For example, the above operation can be performed for 10 seconds.

In step S203 , the air-tight device 12 maintains the air pressure inside the object under test 2 at a preset air pressure during a second time period later than the first time period. Specifically, in the second time period later than the first time period, the air tightness instrument 12 will simultaneously measure the air pressure in the test object 2 and selectively extract gas from the test object 2 according to the measurement results, so that the test object 2 The air pressure in object 2 is maintained at the preset air pressure. For example, the above operation can be performed for 10 seconds.

In particular, the pumping and waiting time in the above example can be about or less than 30 seconds in total, plus the time for measuring the leakage and judging whether the leakage is too high, and the time for performing all the test steps for a DUT It can be controlled to about 1 minute. Compared with the general water resistance test, it can complete the detection of the airtightness of the product more efficiently.

In another embodiment, in addition to steps S101 - S107 in FIG. 2 , the airtightness testing method may further include a step of setting a preset air pressure. Please refer to FIG. 4 . FIG. 4 shows a flow chart of steps of obtaining a preset air pressure in an airtightness testing method according to an embodiment of the present application. As shown in Figure 4, the step of obtaining the preset air pressure of the airtightness test method may include step S301: calculate the air pressure difference according to the water depth, the density of the water, and the acceleration of gravity; Decrease the air pressure differential to achieve the preset air pressure. The above steps can be performed by the airtightness testing system 1 shown in FIG. 1 , and the implementation of each step will be described below using the airtightness testing system 1 shown in FIG. 1 as an example.

In step S301, the airtight instrument 12 calculates the air pressure difference according to the water depth, the water density and the acceleration of gravity. Specifically, the air pressure difference is determined according to the following formula (1),

p=ρgh formula (1)

Among them, p is the air pressure difference, ρ is the density of water, g is the acceleration of gravity, and h is the water depth defined by the waterproof test level.

In step S302 , the air tightness instrument 12 adds the air pressure difference to the external ambient air pressure of the object under test 2 to obtain a preset air pressure. Specifically, the external ambient air pressure of the object under test 2 can be measured by the airtight meter 12 , or it can be a preset value of the airtight meter 12 , or can be set by the operator.

In yet another embodiment, for a plurality of test objects, the airtightness testing method may further include a second-stage testing step in addition to the aforementioned steps S101 - S107 in FIG. 2 . Please refer to FIG. 5 , which shows a flow chart of an airtightness testing method in another embodiment of the present application. As shown in Figure 5, after the result of the airtightness test is obtained in step S107, the airtightness test method further includes: when the estimated leakage is greater than the preset standard leakage, at least one of the tested objects Each of them is used as a target, and step S401 is performed individually: performing negative pressure operation on the target through the air hole of the target, so that the inside of the target is decompressed to the preset air pressure; Step S403: the inside of the target is depressurized to the preset pressure After the air pressure, measure another measured air pressure inside the target object; step S405: calculate another estimated leakage amount according to another measured air pressure and the preset air pressure; and step S407: compare another estimated leakage amount and another preset standard leakage to obtain another result of the airtightness test. The implementation of steps S401 - S405 is substantially the same as steps S101 - S105 in FIG. 2 , and will not be repeated here. The comparison method of step S407 is also roughly the same as that of step S107 in Figure 2, but as mentioned above, the preset standard leakage volume is positively correlated with the quantity of the test object, so the preset standard leakage volume used in step S407 is smaller than that in step S107 The preset standard leakage volume used.

The airtightness testing method and system of one or more of the above embodiments are particularly applicable to products with breathable valves or detachable bolts connecting the inside and outside.

Through the above structure, the airtightness test method and system disclosed in this case can pressurize the object to be tested in the way of negative pressure operation, and obtain the airtightness test result by comparing the estimated leakage amount with the preset standard leakage amount, and complete the airtightness test. Performance testing, so that in the application of waterproof testing, the purpose of testing the waterproof performance of products can be achieved. In addition, compared with the general waterproof test that needs to disassemble the casing to determine the waterproofness, the airtightness test method and system disclosed in this case can use the comparison between the air pressure leakage and the preset standard leakage to obtain the airtightness test results , can achieve 100% inspection and shipment, and can greatly reduce the test time and the cost of scrapping test products.

In addition, by testing multiple DUTs at the same time, when the estimated leakage is greater than the preset standard leakage, and then testing multiple DUTs individually, the airtightness testing method and system disclosed in the embodiment of this case can also be Test a large number of objects under test at the same time, and can greatly reduce the time for air tightness testing of the objects under test.

Although the present invention is disclosed by the aforementioned embodiments, they are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes and modifications made belong to the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended claims.

Claims (10)

1. A method of testing air tightness, comprising:

carrying out negative pressure operation on at least one object to be tested through an air hole of the at least one object to be tested, so that the inside of the at least one object to be tested is depressurized to a preset air pressure to have an air pressure difference with the outside of the at least one object to be tested, wherein the air pressure difference corresponds to the depth of water depth defined by a waterproof test grade;

after the internal pressure of the at least one object to be measured is reduced to the preset air pressure, measuring the measured air pressure of the internal part of the at least one object to be measured;

calculating an estimated leakage amount according to the measured air pressure and the preset air pressure; and

and comparing the estimated leakage amount with a preset standard leakage amount to obtain a result of the air tightness test.

2. The method of claim 1, wherein the performing the negative pressure operation on the at least one test object comprises:

extracting gas corresponding to the air pressure difference from the interior of the at least one object to be detected in a first period; and

maintaining the air pressure of the interior of the at least one object to be tested at the preset air pressure in a second period of time later than the first period of time.

3. The method of claim 1, further comprising

Calculating the air pressure difference according to the depth of the water depth, the density of the water and the gravity acceleration; and

and subtracting the air pressure difference from the external ambient air pressure of the at least one object to be detected to obtain the preset air pressure.

4. The method according to claim 1, wherein the number of the at least one object to be tested is plural, and the method further comprises:

when the estimated leakage amount is greater than the preset standard leakage amount, each of the at least one object to be measured is used as a target object to execute:

the negative pressure operation is carried out on the target object through the air holes of the target object, so that the inside of the target object is depressurized to the preset air pressure;

after the internal pressure of the target is reduced to the preset air pressure, measuring another air pressure of the internal part of the target;

calculating another estimated leakage amount according to the other measured air pressure and the preset air pressure; and

comparing the other estimated leakage amount with another preset standard leakage amount to obtain another result of the air tightness test.

5. The method according to claim 1, wherein the predetermined standard leakage amount is positively correlated with the number of the at least one test object.

6. A gas tightness test system, comprising:

the connecting device is used for connecting with at least one air hole of the object to be detected; and

the airtight instrument is connected with the connecting device and is used for carrying out negative pressure operation on the at least one object to be tested to preset air pressure through the connecting device by utilizing an air source so as to enable the air pressure difference between the inside of the at least one object to be tested and the outside of the at least one object to be tested to be provided, measuring the measured air pressure of the inside of the at least one object to be tested after the inside of the at least one object to be tested is depressurized to the preset air pressure, calculating estimated leakage according to the measured air pressure and the preset air pressure, and comparing the estimated leakage with a preset standard leakage to obtain an air tightness test result;

wherein the air pressure difference corresponds to a water depth defined by the waterproof test grade.

7. The air tightness testing system according to claim 6, wherein said air tightness meter is configured to draw out air corresponding to said air pressure difference from said interior of said at least one object to be tested during a first period of time and maintain an air pressure of said interior of said at least one object to be tested at said preset air pressure during a second period of time that is later than said first period of time.

8. The air tightness testing system according to claim 6, wherein said predetermined air pressure is said air pressure difference of said external environment of said at least one object to be tested, and said air pressure difference is calculated according to said depth of water, density of water and gravitational acceleration.

9. The air tightness testing system according to claim 6, wherein the number of said at least one object to be tested is plural, and said air tightness meter is further configured to execute, when said estimated leakage is greater than said preset standard leakage, each of said at least one object to be tested as a target object:

the negative pressure operation is carried out on the target object through the air holes of the target object, so that the inside of the target object is depressurized to the preset air pressure;

after the internal pressure of the target is reduced to the preset air pressure, measuring another air pressure of the internal part of the target;

calculating another estimated leakage amount according to the another measured air pressure measured by the air tightness meter and the preset air pressure; and

comparing the other estimated leakage amount with another preset standard leakage amount to obtain another result of the air tightness test.

10. The air tightness testing system according to claim 6, wherein the number of said at least one object to be tested is positively correlated with said preset standard leakage.