Device for testing air tightness of gas-filled packaging product by using bubble method

Abstract

The utility model belongs to the field of packaging bag sealing performance detection, and particularly discloses a device for testing the air tightness of an inflatable packaging product through a bubble method. Comprising a box body, a base installed at the bottom of the box body, an upper cover movably connected with the upper end face of the bottom of the box body, a pressing plate installed at the bottom of the upper cover, a pressure gauge arranged at the top end of the box body and a supporting plate movably connected with the side edge of the upper end face of the box body. The box body and the upper cover are both made of acrylic materials so that the bubble generation condition in the detection process can be observed conveniently, the supporting plate is designed so that detected objects can be taken conveniently after the upper cover is opened, the pressure gauge can monitor the pressure in the box body in real time, the stability of the detection environment is ensured, and the packaging box is suitable for packaging products of different sizes within a certain range; and the one-way valve can effectively prevent the influence of external pressure on the pressure of the box body, so that a relatively stable vacuum environment is kept.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag sealing test technology, specifically a bubble method airtightness test device for inflatable packaging products. Background Technology

[0002] The bubble method for airtightness testing is based on the physical principle of the interaction between gas pressure and liquid sealing. Specifically, when an object is filled with gas at a certain pressure, if there are tiny pores or cracks on the object's surface or inside, the gas will leak out through these defects under pressure. If the object is then fully or partially immersed in water, the leaked gas will form bubbles in the water, thus visually indicating the location and size of the leak.

[0003] This detection method utilizes the relatively low solubility and diffusion rate of gases in liquids, allowing even minute leaks to be observed through bubble formation. Simultaneously, due to the incompressibility and excellent sealing properties of water, it can provide a relatively stable external pressure to the object being tested.

[0004] Bubble leak test, also known as bubble emission test, submersion leak test, underwater immersion leak test, or dunking test, is a test method that detects and locates leaks in the tested object by releasing bubbles.

[0005] The basic principle of the bubble leak detection method is to create a pressure difference between the inside and outside of the object being tested, which is immersed in a water medium. If a leak exists, the high-pressure gas flows from the leak point to the low-pressure side, and bubbles generated by the leaking gas in the water can be observed on the low-pressure side. This method is characterized by its ease of operation, speed, and low cost, and helps to detect internal leaks more accurately.

[0006] The sensitivity of bubble leak detection methods is affected by pressure difference, pressurized gas, and foaming solution. Currently, bubble leak detection methods mainly rely on the following two techniques and corresponding methods:

[0007] (1) Pressurization technique: The inside of the object under test is pressurized directly with gas, and a foaming solution is applied directly to the outside of the object under test or the object under test is directly immersed in the solution. The presence and location of the leak are determined by the bubbles formed when the leaking gas passes through the liquid. The corresponding standard is ASTM F2096 "Standard test method for detecting serious leakage of medical packaging by internal pressure".

[0008] (2) Vacuum technology: This method is suitable for leak detection of equipment where direct pressure cannot be applied during testing. A foaming solution is applied to a localized area of ​​the equipment casing, and then a vacuum chamber is used to create a pressure difference between the two sides of this localized area. If a leak occurs, bubbles will be generated on the side with lower pressure, thus determining the location of the leak. The corresponding standard is ASTM D3078, "Standard Leakage Test Method for Determining Leakage of Flexible Packaging by Bubble Emission". This utility model mainly designs a device for this method.

[0009] The national standard GB / T 34637 "Non-destructive testing method for testing bubble leakage" summarizes the above two methods. There is also a corresponding standard for leak detection of rigid containers, ASTM D4991, which is a standard test method for testing the leakage of empty rigid containers using the vacuum method, but the basic principles are the same.

[0010] Existing bubble leakage detection methods are not conducive to observing the bubble situation, and the size of the packaged product is limited during the testing process, which increases the testing cost and causes some trouble. In addition, the testing environment is unstable during the testing process. Therefore, this paper provides a bubble method airtightness testing device for inflatable packaging products. Utility Model Content

[0011] The purpose of this invention is to provide a device for testing the air tightness of inflatable packaging products using the bubble method, so as to solve the problems mentioned in the background art.

[0012] To achieve the above objectives, this utility model provides the following technical solution: a bubble method airtightness testing device for inflatable packaging products, comprising a box, a base installed at the bottom of the box, a top cover movably connected to the upper end face of the bottom of the box, a pressure plate installed at the bottom of the top cover, a pressure gauge set at the top of the box, and a support plate movably connected to the side of the upper end face of the box.

[0013] A ball valve and a pressure regulating valve are respectively installed on both sides of the bottom of the base. The ball valve is connected to the pressure regulating valve through a pipe. One side of the pressure regulating valve is connected to the vacuum generator and the one-way valve located inside the base in sequence. The pipe connected to the one-way valve passes through the base and the upper end face of the box and is connected to the air extraction port.

[0014] A sealing groove is provided along the lower edge of the top cover, and a matching sealing strip is provided inside the sealing groove. Threaded holes are evenly provided at the bottom of the top cover. The pressure plate is connected to the top cover by screws passing through the threaded holes. The pressure plate is provided with a hollowed-out waist-shaped groove. Both the box body and the top cover are made of transparent acrylic material.

[0015] Preferably, the ball valve is connected to the air compressor. Positive pressure air from the air compressor flows through the ball valve, is regulated by the pressure regulating valve, and flows to the vacuum generator. The vacuum generator converts the positive pressure air source into a negative pressure air source, and then connects to the air extraction port through a one-way valve. The air extraction port is located at the top of the housing to transmit the air source to the inside of the housing.

[0016] Preferably, one side of the top cover is connected to the box body by a hinge. After the top cover is rotated open, one end of the support plate is rotated to the bottom of the top cover along the connection between the support plate and the box body, and the support plate supports the top cover.

[0017] Preferably, the top cover is rotatably connected to the top of the box, and the top cover and the inside of the box form a sealed environment. The top cover rotates and presses down, driving the pressure plate to press down, pressing the test sample placed under the pressure plate into the water inside the box.

[0018] Preferably, the upper end face of the cover is provided with a detection port; a pressure gauge and a ball valve are installed at the detection port to observe the pressure changes inside the box in real time.

[0019] Preferably, a drain outlet is provided at the bottom of the box, and a ball valve is installed at the drain outlet, which is connected to a hose.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: the box body and the top cover of this utility model are both made of acrylic material, which makes it easy to observe the generation of bubbles during the testing process. The support plate design makes it easy to take out the tested items after the top cover is opened. The pressure gauge can monitor the pressure inside the box in real time to ensure the stability of the testing environment. It is suitable for packaging products of different sizes within a certain range, realizes multiple uses of one chamber, effectively saves costs, and the one-way valve can effectively block the influence of external pressure on the pressure of the box body, maintaining a relatively stable vacuum environment. Attached Figure Description

[0021] Figure 1 This is a perspective view of the entire utility model;

[0022] Figure 2 This is a cross-sectional view of the housing of this utility model.

[0023] In the diagram: 1. Base; 2. Housing; 3. Top cover; 4. Pressure plate; 5. Ball valve one; 6. Pressure regulating valve; 7. Vacuum generator; 8. Check valve; 9. Ball valve two; 10. Support plate; 11. Hinge; 12. Pressure gauge; 13. Ball valve three; 14. Sealing groove; 15. Drain outlet; 16. Detection port; 17. Air extraction port; 18. Threaded hole; 19. Waist-shaped groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Please see Figure 1-2 This utility model provides a technical solution: an airtightness testing device for inflatable packaging products using the bubble method, comprising a box body 2, a base 1 installed at the bottom of the box body 2, an upper cover 3 movably connected to the upper end face of the bottom of the box body 2, a pressure plate 4 installed at the bottom of the upper cover 3, a pressure gauge 12 set at the top of the box body 2, and a support plate 10 movably connected to the side of the upper end face of the box body 2.

[0028] Ball valve 5 and pressure regulating valve 6 are respectively installed on both sides of the bottom of the base 1. Ball valve 5 is connected to pressure regulating valve 6 through a pipe. One side of pressure regulating valve 6 is connected to vacuum generator 7 and one-way valve 8 located inside the base 1 in sequence. The pipe connected to one side of one-way valve 8 passes through the base 1 and the upper end face of the box 2 and is connected to air extraction port 17.

[0029] A sealing groove 14 is provided along the lower edge of the upper cover 3. A matching sealing strip is provided inside the sealing groove 14. Threaded holes 18 are evenly provided at the bottom of the upper cover 3. The upper cover 3 is connected to the pressure plate 4 by screws passing through the threaded holes 18. The pressure plate 4 is provided with a hollow waist-shaped groove 19. Both the box body 2 and the upper cover 3 are made of transparent acrylic material, which can withstand a certain pressure and facilitates observation of whether air bubbles are generated during testing.

[0030] Furthermore, the ball valve 5 is connected to the air compressor. The positive pressure air from the air compressor flows through the ball valve 5, is regulated by the pressure regulating valve 6, and flows to the vacuum generator 7. The vacuum generator 7 converts the positive pressure air source into a negative pressure air source, and then connects to the suction port 17 through the one-way valve 8. The suction port 17 is located at the top of the housing 2, transmitting the air source to the inside of the housing 2. The one-way valve 8 can effectively block the influence of external pressure on the pressure of the housing, maintaining a relatively stable vacuum environment.

[0031] Furthermore, one side of the upper cover 3 is connected to the box body 2 via a hinge 11. After the upper cover 3 is rotated open, one end of the support plate 10 is rotated to the bottom of the upper cover 3 along the connection between the support plate 10 and the box body 2. The support plate 10 supports the upper cover 3. The design of the support plate 10 makes it easy to take out the inspection items after the upper cover 3 is opened.

[0032] Furthermore, the top cover 3 rotates and connects to the top of the box body 2, forming a sealed environment with the inside of the box body 2. The top cover 3 rotates and presses down, driving the pressure plate 4 to press down, pressing the test sample placed under the pressure plate 4 into the water inside the box body 2. It is suitable for packaging products of different sizes within a certain range, realizing multiple uses in one cavity and effectively saving costs.

[0033] Furthermore, the upper end face of the cover 3 is provided with a detection port 16; a pressure gauge 12 and a ball valve 13 are installed at the detection port 16 to observe the pressure changes inside the chamber 2 in real time. The pressure gauge 12 can monitor the pressure inside the chamber in real time to ensure the stability of the detection environment.

[0034] Furthermore, a drain outlet 15 is provided at the bottom of the housing 2, and a ball valve 9 is installed at the drain outlet 15. The ball valve 9 is connected to a hose, and one end of the hose can extend outside the base 1 to facilitate drainage after the test is completed.

[0035] Working principle:

[0036] Positive pressure air from the air compressor flows through ball valve 5, is regulated by pressure regulating valve 6, and then flows to vacuum generator 7. Vacuum generator 7 converts the positive pressure air source into a negative pressure air source, and then connects to suction port 17 through check valve 8 to evacuate the inside of the chamber. Once the required vacuum level is reached, ball valve 5 is closed. Check valve 8 effectively blocks the influence of external pressure on the chamber pressure, maintaining a relatively stable vacuum environment.

[0037] When in use, place the test sample into the chamber 2, press down the top cover 3, and the pressure plate 4 will press down accordingly, which can press the test sample into the water. Because there is air in the test sample, if the test sample is not heavy enough, it will float on the water and cannot be tested.

[0038] The top cover 3 is sealed to the chamber 2. Pressure changes inside the chamber can be observed in real time through the pressure gauge 12. Ball valve 3 13 can be opened after the test to allow air to circulate between the inside of the chamber and the external environment, thus breaking the vacuum.

[0039] If there is a leak in the sample, the gas leaks through the defect under pressure, forming bubbles in the water, thus visually indicating the leak point.

[0040] It is worth noting that: ball valve 1 (5), pressure regulating valve 6, vacuum generator 7, check valve 8, ball valve 2 (9), pressure gauge 12, ball valve 3 (13), and air compressor are well-known technologies in this field, and their structures and models will not be described in detail here. They can all be controlled by controllers in other ways, such as switching them on and off. Their control aspects are well-known technologies in this field, and will not be elaborated on here.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the air tightness of inflatable packaged products using the bubble method, characterized in that: Includes a box body (2), a base (1) installed at the bottom of the box body (2), a top cover (3) movably connected to the upper end face of the bottom of the box body (2), a pressure plate (4) installed at the bottom of the top cover (3), a pressure gauge (12) set at the top of the box body (2), and a support plate (10) movably connected to the side of the upper end face of the box body (2). Ball valve 1 (5) and pressure regulating valve (6) are installed on both sides of the bottom of the base (1). Ball valve 1 (5) is connected to pressure regulating valve (6) through a pipe. One side of pressure regulating valve (6) is connected to vacuum generator (7) and check valve (8) located inside the base (1) in sequence. The pipe connected to the side of check valve (8) passes through the upper end face of the base (1) and the box (2) and is connected to the air extraction port (17). A sealing groove (14) is provided along the lower edge of the top cover (3). A matching sealing strip is provided inside the sealing groove (14). Threaded holes (18) are uniformly provided at the bottom of the top cover (3). The pressure plate (4) is connected to the top cover (3) by screws passing through the threaded holes (18). A hollow waist-shaped groove (19) is provided on the pressure plate (4). Both the box body (2) and the top cover (3) are made of transparent acrylic material.

2. The airtightness testing device for inflatable packaged products using the bubble method according to claim 1, characterized in that: The ball valve (5) is connected to the air compressor. The positive pressure air from the air compressor flows through the ball valve (5), is regulated by the pressure regulating valve (6), and flows to the vacuum generator (7). The vacuum generator (7) converts the positive pressure air source into a negative pressure air source, and then connects to the air extraction port (17) through the one-way valve (8). The air extraction port (17) is located at the top of the housing (2) to transmit the air source to the inside of the housing (2).

3. The airtightness testing device for inflatable packaged products using the bubble method according to claim 1, characterized in that: One side of the top cover (3) is connected to the box body (2) by a hinge (11). After the top cover (3) is rotated open, along the connection between the support plate (10) and the box body (2), one end of the support plate (10) is rotated to the bottom of the top cover (3), and the support plate (10) supports the top cover (3).

4. The airtightness testing device for inflatable packaged products using the bubble method according to claim 1, characterized in that: The top cover (3) rotates and connects to the top of the box (2). The top cover (3) and the inside of the box (2) form a sealed environment. The top cover (3) rotates and presses down, driving the pressure plate (4) to press down, pressing the test sample placed under the pressure plate (4) into the water inside the box (2).

5. The airtightness testing device for inflatable packaged products using the bubble method according to claim 1, characterized in that: The upper end face of the cover (3) is provided with a detection port (16); a pressure gauge (12) and a ball valve (13) are installed at the detection port (16) to observe the pressure change inside the box (2) in real time.

6. The airtightness testing device for inflatable packaged products using the bubble method according to claim 1, characterized in that: The bottom of the box (2) is provided with a drain outlet (15), and a ball valve (9) is installed at the drain outlet (15). The ball valve (9) is connected to a hose.

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