A vacuum decay leak detection device

Abstract

The present invention discloses a vacuum decay leakage detection device, comprising an exhaust assembly, a first sealed chamber for placing a container to be detected, and a detection assembly for connecting the exhaust assembly and the first sealed chamber, and further comprising a second sealed chamber, wherein the detection assembly is arranged in the second sealed chamber, and the exhaust assembly is connected to the second sealed chamber. The vacuum decay leakage detection device of the present invention arranges the detection assembly in the second sealed chamber, and the second sealed chamber is connected to the exhaust assembly. While exhausting the first sealed chamber, the second sealed chamber can also be exhausted, so that the pressure difference between the inside and outside of the detection assembly is extremely small, thereby greatly reducing the leakage of the detection assembly and ensuring the detection accuracy. Compared with the use of high-precision, small-leakage valves, sensors, etc., the present invention is more conducive to ensuring detection accuracy, and has a simpler structure, and the increased cost is completely bearable.

Description

Technical Field

[0001] The present invention relates to the technical field of sealed container sealing detection equipment, and in particular to a vacuum decay leakage detection device. Background Art

[0002] In the existing technology, vacuum decay leak detectors that use the vacuum decay method to detect leaks in sealed containers have generally similar detection principles. The main problem is insufficient detection accuracy, generally only achieving a detection accuracy of 2μm. A major factor affecting detection accuracy is leakage in the detection gas path, which includes leakage at pipe joints, leakage from valves, leakage from detection sensors, and leakage from the first sealed chamber. Due to differences in the specific structure of the equipment and the leakage rate of components, the detection accuracy also varies. If only relying on the use of high-precision valves and sensors with small leakage rates can help reduce leakage and improve detection accuracy, the cost of components with small leakage rates is 4 to 6 times that of ordinary components, the market acceptance is relatively low, and there is an upper limit to the reduction of component leakage. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a vacuum decay leak detection device which has a simple structure, low cost, helps to reduce leakage and improve detection accuracy.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A vacuum decay leak detection device includes an exhaust assembly, a first sealed chamber for placing a container to be tested, and a detection assembly for connecting the exhaust assembly and the first sealed chamber. It also includes a second sealed chamber, the detection assembly is arranged in the second sealed chamber, and the exhaust assembly is connected to the second sealed chamber.

[0006] As a further improvement of the above technical solution: the detection component includes a first solenoid valve, a second solenoid valve and a first pressure detection component. The first sealed chamber, the first solenoid valve, the second solenoid valve and the vacuum component are connected in sequence, and the first pressure detection component is connected to the air outlet of the first solenoid valve.

[0007] As a further improvement of the above technical solution: the detection assembly further includes a second pressure detection component, and the second pressure detection component is respectively connected to the air outlet of the first solenoid valve and the first sealed chamber.

[0008] As a further improvement of the above technical solution: the first solenoid valve and the second solenoid valve are both two-position two-way solenoid valves.

[0009] As a further improvement of the above technical solution: the first pressure detection component and the second pressure detection component are both pressure sensors.

[0010] As a further improvement of the above technical solution: a third solenoid valve is provided in the second sealed chamber, and an air outlet of the third solenoid valve is connected to the air extraction component.

[0011] As a further improvement of the above technical solution: the third solenoid valve is a two-position three-way solenoid valve.

[0012] As a further improvement of the above technical solution: the first sealed chamber includes a chamber cover plate, the second sealed chamber is sealed and connected to the chamber cover plate, a first sealing ring, a second sealing ring and an air guide groove are provided between the chamber cover plate and the first sealed chamber, the air guide groove is located on the outer periphery of the first sealing ring and is connected to the second sealed chamber, and the second sealing ring is located on the outer periphery of the air guide groove.

[0013] As a further improvement of the above technical solution: an air guide hole for connecting the air guide groove and the second sealed chamber is provided on the chamber cover.

[0014] As a further improvement of the above technical solution: the air extraction component includes a vacuum pump.

[0015] Compared with the prior art, the advantages of the present invention are that: whether it is leakage at the pipe joint, leakage of the valve or leakage of the detection sensor, it is related to the internal and external pressure difference. The greater the internal and external pressure difference, the greater the leakage and the lower the detection accuracy. The vacuum attenuation leakage detection device disclosed in the present invention sets the detection component in the second sealed chamber, and the second sealed chamber is connected to the exhaust component. While exhausting the first sealed chamber, the second sealed chamber can also be exhausted, so that the internal and external pressure difference of the detection component is extremely small, thereby greatly reducing the leakage of the detection component and ensuring the detection accuracy. Compared with the use of high-precision, low-leakage valves, sensors, etc., the present invention is more conducive to ensuring detection accuracy, and the structure is simpler, and the increased cost is completely bearable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the vacuum decay leak detection device of the present invention.

[0017] Figure 2 yes Figure 1 A partial enlarged view of .

[0018] The numbers in the figure represent: 1. Vacuum assembly; 2. Container to be tested; 3. First sealed chamber; 31. Chamber cover; 4. Testing assembly; 41. First solenoid valve; 42. Second solenoid valve; 43. First pressure testing component; 44. Second pressure testing component; 5. Second sealed chamber; 6. Third solenoid valve; 71. First sealing ring; 72. Second sealing ring; 73. Air guide groove; 74. Air guide hole. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Figures 1 to 2 An embodiment of the vacuum decay leakage detection device of the present invention is shown. The vacuum decay leakage detection device of this embodiment includes an exhaust component 1, a first sealed chamber 3 for placing a container 2 to be detected (such as a medicine bottle, etc.), and a detection component 4 for connecting the exhaust component 1 and the first sealed chamber 3. It also includes a second sealed chamber 5. The detection component 4 is arranged in the second sealed chamber 5, and the exhaust component 1 is connected to the second sealed chamber 5.

[0021] Whether it is leakage at the pipe joint, leakage of valve components or leakage of detection sensors, it is all related to the internal and external pressure difference. The greater the internal and external pressure difference, the greater the leakage and the lower the detection accuracy. The vacuum decay leakage detection device disclosed in the present invention is configured to place the detection component 4 in the second sealed chamber 5, which is connected to the exhaust component 1. When the first sealed chamber 3 is exhausted, the second sealed chamber 5 can also be exhausted, so that the pressure difference between the inside and outside of the detection component 4 is extremely small, thereby greatly reducing the leakage of the detection component 4 and ensuring the detection accuracy (if the detection component 4 is not arranged in the second sealed chamber 5 but is in the atmospheric environment, then the external pressure of the components and pipelines in the detection component 4 is atmospheric pressure. During the detection process, the first sealed chamber 3 needs to be exhausted to a near vacuum state, and the internal pressure of the detection component 4 is correspondingly close to vacuum. Since the pressure difference between the inside and outside of the detection component 4 is close to one atmosphere, the leakage will be very large. The present invention arranges the detection component 4 in the second sealed chamber 5, and during the detection process, both the first sealed chamber 3 and the second sealed chamber 5 are exhausted to a near vacuum state, so that the pressure difference between the inside and outside of the detection component 4 is very small, and the corresponding leakage will also be very small). Compared with the use of high-precision, low-leakage valves and sensors, the present invention is more conducive to ensuring detection accuracy, has a simpler structure, and the increased cost is completely acceptable. Preferably, the vacuum assembly 1 first vacuums the second sealed chamber 5 to the required pressure for testing, and then vacuums the first sealed chamber 3 to the required pressure for testing to avoid adverse effects of external pressure on the test results.

[0022] Furthermore, in this embodiment, detection assembly 4 includes a first solenoid valve 41, a second solenoid valve 42, and a first pressure detection component 43. The first sealed chamber 3, the first solenoid valve 41, the second solenoid valve 42, and the air extraction assembly 1 are sequentially connected. The first pressure detection component 43 is connected to the outlet of the first solenoid valve 41. In other words, the first pressure detection component 43 detects the pressure on the outlet side of the first solenoid valve 41, thereby determining whether the pressure in the first sealed chamber 3 has reached a set value. The use of the first solenoid valve 41 and the second solenoid valve 42 facilitates on-off control of the detection assembly 4 via a cable outside the second sealed chamber 5, achieving a high degree of automation and intelligence.

[0023] Furthermore, in this embodiment, the detection assembly 4 also includes a second pressure detection component 44, which is connected to the air outlet of the first solenoid valve 41 and the first sealed chamber 3. The second pressure detection component 44 can detect the pressure difference between the air outlet side of the first solenoid valve 41 and the first sealed chamber 3, thereby facilitating the determination of whether the container 2 to be detected is leaking (if the container 2 to be detected is leaking, the pressure in the first sealed chamber 3 will change).

[0024] As a preferred embodiment, the first solenoid valve 41 and the second solenoid valve 42 are both two-position two-way solenoid valves, which are simple in structure, reliable and low in cost.

[0025] As a preferred embodiment, the first pressure detection component 43 and the second pressure detection component 44 are both pressure sensors, which are simple in structure, reliable and low in cost. The difference is that the first pressure detection component 43 is used to detect absolute pressure, while the second pressure detection component 44 is used to detect pressure difference.

[0026] As a preferred embodiment, a third solenoid valve 6 is provided within the second sealed chamber 5. The outlet of third solenoid valve 6 is connected to the air extraction assembly 1. Third solenoid valve 6 also utilizes a two-position, three-way solenoid valve, which features a simple, reliable, and low-cost structure. When third solenoid valve 6 is open, air extraction assembly 1 can evacuate air from the second sealed chamber 5 through third solenoid valve 6. Once the set pressure in the second sealed chamber 5 is reached, third solenoid valve 6 closes, maintaining a stable pressure in the second sealed chamber 5.

[0027] Furthermore, in this embodiment, the first sealed chamber 3 includes a chamber cover 31, and the second sealed chamber 5 is sealedly connected to the chamber cover 31 (for example, by threaded fasteners, etc.), and a first sealing ring 71, a second sealing ring 72 and an air guide groove 73 are provided between the chamber cover 31 and the first sealed chamber 3. The air guide groove 73 is located on the outer periphery of the first sealing ring 71 and is connected to the second sealed chamber 5. Preferably, an air guide hole 74 for connecting the air guide groove 73 and the second sealed chamber 5 is provided on the chamber cover 31, and the second sealing ring 72 is located on the outer periphery of the air guide groove 73. When the vacuum assembly 1 vacuums the first sealed chamber 3 and the second sealed chamber 5 respectively, since the pressure on the inner side of the first sealing ring 71 is consistent with that of the first sealed chamber 3, and the outer side is connected to the second sealed chamber 5 through the air guide groove 73 and the air guide hole 74, the pressure on the outer side of the first sealing ring 71 is consistent with that of the second sealed chamber 5, which can eliminate the pressure difference between the inside and outside of the first sealing ring 71 and improve the sealing between the chamber cover 31 and the first sealed chamber 3.

[0028] In this embodiment, the vacuum assembly 1 includes a vacuum pump, which is used to evacuate the first sealed chamber 3 and the second sealed chamber 5 to form a vacuum required for detection.

[0029] Of course, in other embodiments, the vacuum assembly 1 may also include two vacuum pumps, which respectively evacuate the first sealed chamber 3 and the second sealed chamber 5 to form the required vacuum, which can improve the vacuuming efficiency to a certain extent. However, the disadvantage is that the structure is more complex and the cost is higher.

[0030] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A vacuum decay leak detection device, comprising a vacuum pumping assembly (1), a first sealed chamber (3) for placing a container (2) to be detected, and a detection assembly (4) for connecting the vacuum pumping assembly (1) and the first sealed chamber (3), wherein the vacuum pumping assembly (1) is capable of pumping air from the first sealed chamber (3) through the detection assembly (4), and is characterized in that: The invention also includes a second sealed chamber (5), wherein the detection component (4) is arranged in the second sealed chamber (5), and the exhaust component (1) is connected to the second sealed chamber (5). The detection component (4) includes a first solenoid valve (41), a second solenoid valve (42) and a first pressure detection component (43). The first sealed chamber (3), the first solenoid valve (41), the second solenoid valve (42) and the exhaust component (1) are connected in sequence. The first pressure detection component (43) is connected to the air outlet of the first solenoid valve (41). The detection component (4) also includes a second pressure detection component (44), and the second pressure detection component (44) is respectively connected to the air outlet of the first solenoid valve (41) and the first sealed chamber (3).

2. The vacuum decay leak detection device according to claim 1, wherein: The first solenoid valve (41) and the second solenoid valve (42) are both two-position two-way solenoid valves.

3. The vacuum decay leak detection device according to claim 1, wherein: The first pressure detection component (43) and the second pressure detection component (44) are both pressure sensors.

4. The vacuum decay leak detection device according to claim 1, wherein: A third solenoid valve (6) is provided in the second sealed chamber (5), and an air outlet of the third solenoid valve (6) is connected to the air extraction component (1).

5. The vacuum decay leak detection device according to claim 4, characterized in that: The third solenoid valve (6) is a two-position three-way solenoid valve.

6. The vacuum decay leak detection device according to any one of claims 1 to 5, characterized in that: The first sealed chamber (3) includes a chamber cover (31), the second sealed chamber (5) is sealedly connected to the chamber cover (31), and a first sealing ring (71), a second sealing ring (72) and an air guide groove (73) are provided between the chamber cover (31) and the first sealed chamber (3), the air guide groove (73) is located on the periphery of the first sealing ring (71) and is in communication with the second sealed chamber (5), and the second sealing ring (72) is located on the periphery of the air guide groove (73).

7. The vacuum decay leak detection device according to claim 6, characterized in that: An air guide hole (74) for connecting the air guide groove (73) and the second sealed chamber (5) is provided on the chamber cover (31).

8. The vacuum decay leak detection device according to any one of claims 1 to 5, characterized in that: The air extraction component (1) comprises a vacuum pump.

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