CN216621652U - Direct-pressure and differential-pressure integrated air tightness detector - Google Patents

Abstract

The utility model provides a direct pressure and differential pressure integrated air tightness detector which comprises a main air path, a measured object air path, a reference object air path and an air release air path, wherein the measured object air path and the reference object air path are arranged in parallel and are respectively connected with the main air path, the main air path is also connected with the air release air path, an air pump and an air inlet valve are arranged on the main air path, a reference object valve is arranged on the reference object air path, and an air release valve is arranged on the air release air path. The utility model is compatible with differential pressure test and direct pressure test at the same time, and by using the structure design of mutual switching between differential pressure and direct pressure modes, a user can complete the test of various multi-standard tested objects by selecting the test mode, the test pressure and other parameter configurations. Compared with the existing airtight instrument structure, the airtight instrument structure solves the problem of special purpose of a special machine, has wider application range, improves the testing work efficiency, reduces the use cost and fully expands the use value.

Description

Direct-pressure and differential-pressure integrated air tightness detector

Technical Field

The utility model relates to the technical field of airtightness detection, in particular to an airtightness detector integrating direct pressure and differential pressure.

Background

With the continuous progress of science and technology, the requirements on new products are more and more strict, wherein the requirements on the sealing grade of the products are more and more strict, and a plurality of methods are provided for detecting whether the sealing performance of the products is qualified or not. For example, the early judgment of the sealing performance of some simple industrial products only needs to put the products into water to visually inspect whether water seepage occurs. The inside of the product can be filled with smoke, and whether the smoke seeps out of the product or not can be observed. However, these testing methods all have certain defects, the water immersion method cannot test precise electronic products, the smoke detection method cannot detect some tiny leak holes due to large smoke molecules, and smoke stains can be left in the products and cannot be removed.

The air-pressure type air tightness detector (air tightness instrument for short) is available in the later stage, the air tightness instrument is mainly applied to automobile parts, new energy, medical equipment, household appliances and other industries, and the air tightness instrument mainly comprises two types at present:

1. the principle of the direct-pressure type air tightness instrument is that the leakage quantity is calculated by comparing the air pressure of the measured object with the atmospheric pressure.

2. The differential pressure type air tightness instrument adopts the principle that a standard substance with the same volume as a measured object is used as a reference substance, and leakage quantity is calculated by judging the differential pressure between the measured object and the reference substance, so that the principle test is more accurate, and the differential pressure type air tightness instrument is mainly applied to high-pressure-resistant environments.

However, as the types, shapes, parameters and determination standards of the objects to be tested are more and more, the test range and the test method of the air-tight instrument are limited, and the situation that one air-tight instrument can only be adapted to one or more types of the objects to be tested occurs. The air tightness test of parts of an automobile, such as a power battery pack, is carried out by using a direct-pressure air tightness instrument, and the air tightness test of an automobile cooling pipeline system is carried out by using a differential-pressure air tightness instrument. If two air tightness instruments are used in a mixed way, the problems that the testing conditions are not met due to low filling air pressure, the tested object is damaged due to overhigh air pressure, the testing result is inaccurate and the like can occur.

Therefore, for two parts of the same automobile, the problem of compatibility between the air-tight instrument and the tested object is solved by using two types and ranges of air-tight instruments, so as to develop an air-tight instrument which is compatible with the tested object in the market, improve the working efficiency of a user and reduce the use cost, which is a technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to solve at least one of the technical drawbacks mentioned.

Therefore, an object of the present invention is to provide an air tightness detector integrating direct pressure and differential pressure, so as to solve the problems mentioned in the background art and overcome the disadvantages in the prior art.

In order to achieve the above object, an embodiment of one aspect of the present invention provides an air tightness detector integrating direct pressure and differential pressure, including a main air path, a measured object air path, a reference object air path and an air release air path, where the measured object air path and the reference object air path are arranged in parallel and are respectively connected to the main air path, the main air path is further connected to an air release air path, an air pump and an air inlet valve are arranged on the main air path, a reference object valve is arranged on the reference object air path, and an air release valve is arranged on the air release air path.

Preferably, a first filter is arranged on the reference object gas path, and a second filter is arranged on the measured object gas path.

In any of the above embodiments, preferably, a silencer is connected to a terminal of the purge valve.

In any of the above schemes, preferably, the gas path of the object to be measured is provided with a direct pressure sensor.

In any of the above schemes, preferably, a differential pressure sensor is arranged between the gas path of the measured object and the gas path of the reference object.

In any of the above schemes, preferably, the measured object gas path, the reference object gas path and the deflation gas path are respectively connected with the main gas path through a threaded quick connector.

Compared with the prior art, the utility model has the advantages and beneficial effects that:

by simultaneously being compatible with the differential pressure test and the direct pressure test and utilizing the structural design of mutual switching between the differential pressure mode and the direct pressure mode, a user can complete the test of various multi-standard tested objects by selecting the test mode, the test pressure and other parameter configurations. Compared with the existing airtight instrument structure, the airtight instrument structure has the advantages that the problem of special purpose of a special machine is solved, the application range is wider, the test working efficiency is improved, meanwhile, the use cost is reduced, and the use value is fully expanded.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of an airtight detector integrating direct pressure and differential pressure according to an embodiment of the present invention;

wherein: 1. a touch display; 2. a control circuit; 3. a main gas path; 4. an air pump; 5. an intake valve; 6. a muffler; 7. a deflation valve; 8. a reference valve; 9. a direct pressure sensor; 10. a differential pressure sensor; 11. a first filter; 12. a second filter; 13. a measured object; 14. a reference; 15. a gas path of a measured object; 16. a reference gas path; 17. and (5) deflating the air path.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, the airtightness detector integrating direct pressure and differential pressure according to the embodiment of the present invention includes a main gas path 3, a measured object gas path 15, a reference object gas path 16, and an air release gas path 17, where the measured object gas path 15 and the reference object gas path 16 are arranged in parallel and are respectively connected to the main gas path 3, and the main gas path 3 is further connected to the air release gas path 17. The reference object gas path 16 is connected to the reference object 14, and the measured object gas path 15 is connected to the measured object 13. An air pump 4 and an air inlet valve 5 are arranged on the main air path 3, a reference object valve 8 is arranged on the reference object air path 16, and an air release valve 7 is arranged on the air release air path 17. Wherein the reference valve 8 is an electromagnetic valve.

The first filter 11 is arranged on the reference object gas path 16, and the second filter 12 is arranged on the measured object gas path 15. The first filter 11 and the second filter 12 can effectively prevent impurities from entering the reference object 14 and the measured object 13.

The tail end of the air release valve 7 is connected with the silencer 6, so that noise generated when the air release valve 7 releases pressure can be reduced.

The gas circuit 15 of the measured object is provided with a direct pressure sensor 9 to detect the pressure value on the gas circuit 15 of the measured object in real time.

A differential pressure sensor 10 is arranged between the measured object gas path 15 and the reference object gas path 16 to detect the differential pressure value between the measured object gas path 15 and the reference object gas path 16 in real time.

The gas circuit 15 for the measured object, the gas circuit 16 for the reference object and the gas circuit 17 for the air bleed are respectively connected with the main gas circuit 3 through screw-type quick connectors. Wherein, each gas circuit adopts 6mmPU pipe.

The air pump 4, the air intake valve 5, the reference valve 8, the direct pressure sensor 9, and the differential pressure sensor 10 are connected to the control circuit 2, respectively, and the control circuit 2 is further connected to the touch display 1. The control circuit 2 adopts a chip model number STM32 series.

By inputting a control instruction on the touch screen display and transmitting the control instruction to the control circuit 2, the control circuit 2 controls the air pump 4, the air inlet valve 5 and the reference object valve 8 to be opened and closed respectively, the direct pressure sensor 9 and the differential pressure sensor 10 transmit the pressure value detected in real time to the control circuit 2 respectively, and the control circuit 2 transmits the final test structure to the touch screen display.

The working principle of the air tightness detector integrating the direct pressure and the differential pressure in the embodiment is specifically described as follows.

One, differential pressure mode

S1, the air pump 4, the air intake valve 5, and the reference valve 8 are opened to inflate the reference 14 and the measured object 13, respectively.

S2, voltage stabilization: when the air pressure of each air path meets the set pressure, the air inlet valve 5 and the air pump 4 are closed, and the pressure stabilizing time is started at the moment, wherein the pressure stabilizing time is generally 100 seconds.

S3, testing: and (3) closing the reference object valve 8, delaying for 10 seconds, entering a testing stage, and taking a final differential pressure value by the control circuit 2 according to the real-time received differential pressure value and transmitting the final differential pressure value to the touch display 1.

S4, pressure relief stage: after the test is finished, the reference object valve 8 and the air release valve 7 are opened, the air path is decompressed, after the decompression is finished, the reference object valve 8 and the air release valve 7 are closed, and at the moment, the differential pressure mode test is finished.

Two, direct pressure mode

And S1, the air pump 4 and the air inlet valve 5 are opened to charge the measured object 13.

S2, voltage stabilization: when the air pressure of each air path meets the set pressure, the air inlet valve 5 and the air pump 4 are closed, and the pressure stabilizing time is started at the moment, wherein the pressure stabilizing time is generally 100 seconds.

S3, testing: the control circuit 2 calculates two sets of pressure value data at the beginning and the end of the test according to the pressure value received in real time, and transmits the final result to the touch display 1.

S4, pressure relief stage: after the test is finished, the air release valve 7 is opened, the air path is decompressed, after the decompression is finished, the air release valve 7 is closed, and at the moment, the direct pressure mode test is finished.

The utility model is compatible with differential pressure test and direct pressure test at the same time, and by using the structure design of mutual switching between differential pressure and direct pressure modes, a user can complete the test of various multi-standard tested objects 13 by selecting the test mode, the test pressure and other parameter configurations. Compared with the existing airtight instrument structure, the airtight instrument structure has the advantages that the problem of special purpose of a special machine is solved, the application range is wider, the test working efficiency is improved, meanwhile, the use cost is reduced, and the use value is fully expanded.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It will be understood by those skilled in the art that the utility model includes any combination of the elements of the foregoing description and the detailed description as well as those illustrated in the drawings, which are meant to be space-limited and not intended to constitute a part of the specification in any way whatsoever, the combination being such that the description is not intended to be exhaustive. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides a collect straight pressure and differential pressure integrative gas tightness detector, its characterized in that, includes main gas circuit, measured object gas circuit, benchmark thing gas circuit and gassing gas circuit, measured object gas circuit and benchmark thing gas circuit parallel arrangement and respectively with main gas circuit is connected, still be connected with the gassing gas circuit on main gas circuit, be equipped with air pump, admission valve on main gas circuit, be equipped with the benchmark thing valve on the benchmark thing gas circuit, be equipped with the bleed valve on the gassing gas circuit.

2. The instrument of claim 1, wherein a first filter is disposed on the reference gas path, and a second filter is disposed on the object gas path.

3. The airtightness detector integrating the direct pressure and the differential pressure as claimed in claim 1, wherein a silencer is connected to an end of the air release valve.

4. The instrument of claim 1, wherein a direct pressure sensor is disposed on the gas path of the object to be tested.

5. The instrument of claim 1, wherein a differential pressure sensor is disposed between the gas path of the object to be measured and the gas path of the reference object.

6. The instrument of claim 1, wherein the gas path for the object to be measured, the gas path for the reference object, and the gas path for the vent gas are connected to the main gas path by screw quick connectors.

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