Device and method for detecting glove leakage rate of glove box by using air bag

Abstract

The invention discloses a device for detecting the glove leakage rate of a glove box by using an air bag and a detection method, and adopts an air bag assembly to realize rapid deoxygenation through volume expansion and contraction and provide a low-oxygen environment so as to accurately detect the air permeability of the glove. The device comprises a cavity, wherein one end of the cavity is provided with a glove mounting piece and is in sealing connection with a glove to be detected. Through cooperative operation of the vacuum pump and the nitrogen source, the differential pressure gauge and the oxygen analyzer are used for accurately monitoring the change of the oxygen concentration in the cavity, so that the influence of background leakage is effectively eliminated, and accurate detection data are provided. The device is simple and convenient in design structure, comprises ring grooves of different sizes to adapt to various glove specifications, and meets the detection requirements of gloves of different materials and calibers. The device does not need a complex adsorption circulating system or high-vacuum-degree equipment, and the oxygen concentration can be quickly reduced to the ppm magnitude only by depending on the air bag assembly and the vacuum pump, so that the integrated and standardized detection process is realized, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of individual radiation protection equipment detection, and in particular to a device and a method for detecting the leakage rate of gloves in a glove box by using an air bag. Background Art

[0002] Sealed glove box operation is one of the important contents in the field of radiation protection. Since glove boxes usually contain toxic, harmful or radioactive substances, the barrier properties of glove box gloves are very important. Glove box gloves need to have good barrier properties to prevent harmful substances from penetrating the gloves and endangering the health of workers. In addition, some operations need to be carried out in specific environments such as inert gas, which requires gloves to have good air barrier properties to reduce the penetration of external oxygen and ensure that the atmosphere in the box is not disturbed.

[0003] Generally, the barrier properties of glove box gloves refer to two situations, one is the barrier property for penetration mechanism, and the other is the barrier property for permeation mechanism. Penetration refers to the entry of gas or substance into the box through the damage or holes in the glove material; while permeation refers to the gradual penetration of gas molecules through the protective material through dissolution and molecular movement in the glove material, a process that is usually difficult to detect. Penetration testing is relatively easy, such as detecting damaged or holed gloves through the pressure drop method, while permeation performance is more complicated and needs to be characterized by leakage rate. The leakage rate directly reflects the barrier performance of the glove material to the penetration of air or substances.

[0004] At present, for the barrier property of gloves under the penetration mechanism, some different leakage or sealing detection methods have been proposed in the prior art. For example, patent CN109655213A proposes to detect the air tightness of gloves through pressure sensors, but this method can only detect damage and is invalid for the permeability of complete gloves; patent CN109374225A uses negative pressure and pressure changes to determine the sealing of the glove box, but it detects the overall leakage of the glove box and cannot evaluate the air barrier property of a single glove. The above technologies are mainly based on physical damage detection and cannot characterize the air permeability of complete gloves.

[0005] At the same time, in the existing glove leakage rate test method, the low oxygen environment is usually deoxygenated by nitrogen dilution combined with oxygen purification adsorption columns. However, oxygen purification adsorption columns require the use of high-efficiency catalysts, which are costly and have a limited lifespan. They need to be replaced regularly during use, and the oxygen purification process is time-consuming. In contrast, physical deoxygenation has higher efficiency and lower cost, and can reduce the oxygen concentration to the ppm level in a shorter time. Targeted solutions for deoxygenation using physical methods are urgently needed.

[0006] In view of the above problems, the present invention is proposed. Summary of the invention

[0007] The invention discloses a device and a method for detecting the leakage rate of gloves in a glove box by using an air bag, aiming to solve the technical problems existing in the prior art.

[0008] According to one aspect of the present invention, there is provided a device for detecting the leakage rate of gloves in a glove box using an airbag, comprising:

[0009] The detection cabin is provided with a cavity and a glove mounting piece, the outer surface of the cavity is provided with a connection hole assembly, and the connection hole assembly includes a plurality of connection holes; the glove mounting piece is located at one end of the cavity and is fastened thereto; the glove mounting piece is provided with a protruding portion with a hollow circular opening, the outer peripheral surface of the protruding portion is provided with at least one annular groove, a sealing ring is provided on the outer side of the annular groove, and a sealing ring clamp fixes the glove to be detected on the annular groove, and the glove to be detected, the protruding portion and the cavity together form a space to be detected;

[0010] An airbag assembly is arranged at one end of the cavity away from the glove mounting member, and the airbag assembly expands or contracts by its own volume to squeeze out the air in the cavity;

[0011] A deoxidation component, the deoxidation component includes a vacuum pump for vacuuming and a nitrogen source for injecting nitrogen. The vacuum pump and the nitrogen source are both arranged outside the cavity and connected to the cavity through a connecting hole component respectively. The vacuum pump and the nitrogen source work together to reduce the oxygen content of the space to be detected by combining vacuuming and injecting nitrogen;

[0012] A data detection component, which includes a differential pressure gauge and an oxygen analyzer. Both the differential pressure gauge and the oxygen analyzer are arranged outside the cavity and connected to the outer surface of the cavity through a connecting hole, and are used to detect the pressure difference and oxygen content of the space to be detected;

[0013] In the deoxygenation assembly, outside the cavity, the vacuum pump and the nitrogen source are directly connected to form a fourth pipeline; the airbag assembly is connected to the fourth pipeline. In the first state, the vacuum pump is connected to the airbag assembly to extract the gas inside the airbag assembly to shrink it. In the second state, the nitrogen source is connected to the airbag assembly to inject nitrogen into the airbag assembly to expand it.

[0014] As a preferred technical solution, the airbag assembly is connected to the fourth pipeline to form a fifth pipeline, and a fifth switch valve is provided at the intersection of the fifth pipeline and the fourth pipeline.

[0015] As a preferred technical solution, the fifth switch valve is a three-way switch valve.

[0016] As a preferred technical solution, a sealing cover is provided at one end of the cavity away from the glove mounting piece, and the airbag assembly is sealingly connected to the sealing cover.

[0017] As a preferred technical solution, an eighth connecting hole is provided on the sealing cover, and the airbag assembly is connected to the fourth pipeline through the eighth connecting hole.

[0018] As a preferred technical solution, a circular blocking member is provided at the connection between the protrusion and the cavity, an internal thread is provided on the inner side of the protrusion, and an external thread is provided on the outer periphery of the blocking member. The internal and external threads cooperate to ensure that the blocking member is firmly connected to the inner side of the protrusion to block the connection between the protrusion and the cavity.

[0019] As a preferred technical solution, the protrusion is arranged as a step structure, including a first step and a second step, the second step is arranged close to the cavity, and an internal thread is arranged on the inner side of the second step.

[0020] As a preferred technical solution, the number of annular grooves is ≥3.

[0021] As a preferred technical solution, the diameters of the multiple annular grooves are different to adapt to the cuff sizes of different gloves to be tested.

[0022] As a preferred technical solution, the connecting hole assembly includes a first connecting hole, a second connecting hole and a third connecting hole. The vacuum pump is connected to the first connecting hole and the second connecting hole, respectively, to form a first pipeline and a second pipeline connected to the cavity; the nitrogen source is connected to the third connecting hole to form a third pipeline connected to the cavity.

[0023] As a preferred technical solution, the first pipeline extends inside the cavity to the space formed by the glove mounting piece and the glove to be tested.

[0024] According to another aspect of the present invention, a detection method for leak rate detection using the above device is also provided, comprising:

[0025] The glove mounting part, the blocking part and the sealing cover are sealed and connected to the cavity; the vacuum pump, the nitrogen source, the differential pressure gauge and the oxygen analyzer are connected to the cavity through the connecting hole assembly; the vacuum pump and the nitrogen source are connected outside the cavity to form a fourth pipeline, a fifth switch valve is arranged on the fourth pipeline, and the fifth switch valve is connected to the airbag assembly adjacent to the sealing cover through the sealing cover;

[0026] The standard glove is mounted on the glove mounting part, and the oxygen content inside the cavity is reduced by controlling the vacuum pump, the nitrogen source and the airbag assembly, and a first oxygen concentration change value is detected by using a differential pressure gauge and an oxygen analyzer; based on the first oxygen concentration change value, a first leakage rate representing the background leakage of the cavity is estimated, and based on the first leakage rate, a corrected third leakage rate is estimated;

[0027] Remove the blocking member, reduce the oxygen content inside the cavity by controlling the vacuum pump, the nitrogen source and the airbag assembly, and detect and calculate the second oxygen concentration change value with the help of a differential pressure gauge and an oxygen analyzer; after installing the blocking member and replacing the standard glove with the glove to be tested, remove the blocking member again, reduce the oxygen content inside the cavity by controlling the vacuum pump, the nitrogen source and the airbag assembly, and detect and calculate the third oxygen concentration change value with the help of a differential pressure gauge and an oxygen analyzer; calculate the hourly leakage rate of the glove to be tested based on the third leakage rate, the second oxygen concentration change value and the third oxygen concentration change value according to the following formula:

[0028]

[0029] Where:

[0030] ΔO2——the change in the third oxygen concentration of the glove to be tested, expressed in parts per million (ppm) by volume;

[0031] ΔO1 – the change in oxygen concentration using standard gloves, expressed in parts per million (ppm) by volume;

[0032] t——test duration, min;

[0033] T0 - corrected leak rate taking into account the cavity (third leak rate).

[0034] As a preferred technical solution, the vacuum pump, nitrogen source and airbag assembly reduce the oxygen content by the following steps:

[0035] The first pipeline is provided with a first switch valve, and when the first switch valve is opened, the vacuum pump extracts the internal air of the space formed by the standard glove, the glove mounting member and the blocking member through the first pipeline;

[0036] The second pipeline and the third pipeline are respectively provided with a second switch valve and a third switch valve, the first switch valve is closed, the second switch valve and the third switch valve are opened, the vacuum pump extracts the internal air of the cavity, and the nitrogen source injects nitrogen into the cavity;

[0037] The fifth switch valve is adjusted so that the nitrogen source is connected to the fifth pipeline, and the nitrogen source injects nitrogen into the airbag assembly so that the airbag assembly expands in the cavity. At the same time, the vacuum pump extracts air from the cavity through the second pipeline;

[0038] Adjust the fifth switch valve so that the vacuum pump is connected to the fifth pipeline, and the vacuum pump extracts gas in the airbag assembly, so that the airbag assembly shrinks in the cavity until it is tightly attached to the sealing cover;

[0039] Repeat the above process, through the expansion or contraction of the airbag assembly, in coordination with the vacuum pump and the nitrogen source, reduce the oxygen content inside the cavity, and use the oxygen analyzer to observe the oxygen concentration value inside the cavity until it is reduced to the required oxygen content detection conditions.

[0040] The technical solution adopted by the present invention can achieve at least one of the following beneficial effects:

[0041] 1. The present invention uses the volume expansion and contraction of the airbag assembly to physically adjust the air in the cabin, which can achieve rapid deoxygenation. Compared with traditional adsorption or chemical methods, the present invention can reduce the oxygen concentration to the ppm level in a short time through the simple operation of the airbag assembly and the vacuum pump, saving the use of chemical agents and reducing operation and maintenance costs.

[0042] 2. The present invention provides a low oxygen environment through the coordinated operation of a vacuum pump and a nitrogen source, and monitors the change in oxygen concentration through a precise differential pressure gauge and an oxygen analyzer, effectively eliminating the influence of background leakage of the detection device, making the detection result more accurate and being able to accurately reflect the air permeability of the glove material.

[0043] 3. The device of the present invention has a simple structure design and wide adaptability, and can meet the requirements of glove testing of different materials and calibers. By setting ring grooves of different sizes, the device can quickly adapt to the cuff sizes of various gloves to be tested, and realize an integrated and standardized testing process.

[0044] 4. The overall structure of the device of the present invention is simple in design and does not require a complex adsorption circulation system or a high-vacuum exhaust device. Good test results can be achieved by relying only on the airbag assembly and the basic exhaust pump. The maintenance cost is low and it meets the use conditions of most laboratories and production environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0046] Figure 1 A schematic diagram of the working principle of a device for detecting the leakage rate of gloves in a glove box by using an airbag according to the present invention;

[0047] Figure 2 It is a structural schematic diagram of the airbag assembly of the present invention in an expanded or contracted state;

[0048] Figure 3 It is a schematic diagram of the cross-sectional structure of the detection cabin along BB of the present invention;

[0049] Figure 4 It is a schematic structural diagram of the glove mounting piece of the present invention;

[0050] Figure 5 It is a schematic structural diagram of a blocking member of the present invention;

[0051] Figure 6 It is a schematic diagram of the three-dimensional structure of the sealing cover of the present invention installed in the detection cabin;

[0052] Figure 7 It is a schematic structural diagram of the standard glove or the glove to be tested of the present invention being installed on the glove mounting piece;

[0053] Figure 8 It is a schematic diagram of the standard glove or the glove to be tested of the present invention in a testing state;

[0054] Fig. 9 The present invention is a schematic diagram of a detection process of a device for detecting the leakage rate of gloves in a glove box by using an airbag.

[0055] Description of reference numerals:

[0056] 1. Detection cabin; 11. Cavity; 12. Glove mounting piece; 121. Flange; 122. Protrusion; 13. Connection hole assembly; 131. First connection hole; 132. Second connection hole; 133. Third connection hole; 134. Fourth connection hole; 135. Fifth connection hole; 136. Sixth connection hole; 14. Blocking piece; 141. Seventh connection hole; 142. First handle; 15. Sealing cover; 151. Eighth connection hole; 152. Second handle; 16. Support base; 2. Vacuum pump; 21. First switch valve; 22. Second switch valve; 3. Nitrogen source; 31. Third switch valve; 32. Fourth switch valve; 33. Fifth switch valve; 34. Sixth switch valve; 4. Thermometer; 5. Differential pressure gauge; 6. Oxygen analyzer; 7. Airbag assembly. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0059] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a device for detecting the leakage rate of gloves in a glove box by using an airbag, such as Figure 1-Figure 8 As shown, the detection chamber 1 includes a vacuum pump 2, a nitrogen source 3, a thermometer 4, a differential pressure gauge 5, an oxygen analyzer 6 and an airbag assembly 7 respectively connected to the detection chamber 1. The detection chamber 1 includes a cavity 11, and the outer surface of the cavity 11 is provided with a connection hole assembly 13, including 6 connection holes, for connecting external equipment to the inside of the cavity 11. Figure 3 As shown, the six connection holes are respectively the first connection hole 131, the second connection hole 132, the third connection hole 133, the fourth connection hole 134, the fifth connection hole 135 and the sixth connection hole 136. The vacuum pump 2 and the nitrogen source 3 together form the deoxygenation component of the device. The vacuum pump 2 is connected to the cavity 11 through the first connection hole 131 and the second connection hole 132, and is used to achieve an efficient deoxygenation process by adjusting the air pressure inside the detection cabin 1, that is, to extract the air inside the cavity 11 and reduce the oxygen content in the cavity 11, thereby forming a low oxygen environment, so as to accurately detect the leakage rate of the glove box gloves. The vacuum pump 2 is connected to the first connection hole 131 through a first pipeline, and a first switch valve 21 is provided on the first pipeline to control the on-off of the above-mentioned first pipeline; the vacuum pump 2 is connected to the second connection hole 132 through a second pipeline, and a second switch valve 22 is provided on the second pipeline to control the on-off of the second pipeline. The nitrogen source 3 is connected to the cavity 11 through the third connecting hole 133, and the nitrogen source 3 and the third connecting hole 133 are connected through a third pipeline. A third switch valve 31 is provided on the third pipeline to control the on-off of the third pipeline. The nitrogen source 3 cooperates with the vacuum pump 2 to provide a low-oxygen environment inside the cavity 11. The nitrogen source 3 assists the vacuum pump 2 to achieve a more stable and accurate deoxygenation effect, that is, after the vacuum pump 2 is evacuated, the nitrogen source 3 injects nitrogen into the cavity 11 to replace the residual oxygen, thereby further reducing the oxygen concentration. A third switch valve 31 is provided on the connecting pipeline between the nitrogen source 3 and the third connecting hole 133 to control the on-off of the above pipeline.

[0061] In order to further improve the deoxygenation effect in the cavity 11, an airbag assembly 7 is provided at one end of the cavity 11. Figure 2 As shown, the volume of the airbag assembly 7 can expand, and the air inside the cavity 11 can be squeezed out by its volume expansion. The airbag assembly 7 works in conjunction with the vacuum pump 2 and the nitrogen source 3, as shown in FIG. Figure 1As shown, the vacuum pump 2 and the nitrogen source 3 are further provided with a fourth pipeline interconnected with each other outside the cavity 11, and the fourth pipeline is provided with a fourth switch valve 32, a fifth switch valve 33 and a sixth switch valve 34, the fifth switch valve 33 is a three-way switch valve, and the fifth switch valve 33 is also connected to the airbag assembly 7 through the fifth pipeline. The fourth switch valve 32 and the sixth switch valve 34 are respectively located on the fourth pipeline section where the nitrogen source 3 is connected to the fifth switch valve 33 and the fourth pipeline section where the vacuum pump 2 is connected to the fifth switch valve 33 in the fourth pipeline. In the first state, when the fifth switch valve 33 is turned on so that the fifth pipeline is connected and connected to the vacuum pump 2, the sixth switch valve 34 is opened, and the vacuum pump 2 extracts the air inside the cavity 11 while extracting the internal gas of the airbag assembly 7, so that the airbag assembly 7 is in a tightened state; in the second state, the fifth switch valve 33 is adjusted, and when the fifth pipeline is turned on and connected to the nitrogen source 3, the fourth switch valve 32 is opened, and the nitrogen from the nitrogen source 3 will be injected into the airbag assembly 7 to expand its volume, and at the same time, the gas in the cavity 11 will be further squeezed and compressed to achieve a better deoxygenation effect inside the cavity 11.

[0062] The thermometer 4 is connected to the cavity 11 through the fourth connection hole 134, and is used to monitor the temperature inside the cavity 11 in real time to ensure that the glove box glove leakage rate detection process is carried out under stable and appropriate temperature conditions. The differential pressure gauge 5 is connected to the cavity 11 through the fifth connection hole 135, and is used to monitor the measurement of the relative pressure difference of the gas inside the cavity 11 in real time. The oxygen analyzer 6 is connected to the cavity 11 through the sixth connection hole 136, and can detect the trace oxygen level inside the cavity 11 in real time and accurately, providing core data support for leakage rate detection. The above-mentioned thermometer 4, differential pressure gauge 5 and oxygen analyzer 6 together constitute the data detection component of the device, which outputs corresponding detection data by detecting temperature, pressure difference and oxygen content.

[0063] like Figure 2-Figure 6 As shown, the detection chamber 1 also includes a glove mounting member 12, a blocking member 14 and a sealing cover 15. Figure 2 and Figure 3As shown, the glove mounting member 12 includes a flange portion 121 and a protrusion 122. The flange 121 is a circular flange structure, and a plurality of mounting holes are evenly distributed on the flange for bolts or screws to pass through and fixedly connected to one end of the cavity 11. The protrusion 122 is used to fix the glove to be tested, and is arranged as a hollow circular opening structure, and a plurality of annular grooves are arranged on the outside thereof for mounting the glove to be tested. Furthermore, the number of annular grooves is arranged to be at least three, and the diameters of the three annular grooves are arranged to be three different interface sizes, such as 160mm, 180mm, and 200mm. Other diameter sizes can also be arranged as needed. An O-ring is arranged at the above-mentioned annular groove. When the glove to be tested is installed, its cuff is placed at the above-mentioned annular groove position and fixed by the O-ring. At the same time, the O-ring can minimize the oxygen leakage at the glove mounting member 12 to achieve a good sealing effect. The inside of the protrusion 122 is arranged as a step structure. The inside of the protrusion 122 corresponding to the above-mentioned annular groove is a first step, and the inside of the protrusion 122 between the above-mentioned annular groove and the flange part 121 is a second step. The diameter of the first step is smaller than the diameter of the second step, and an internal thread is arranged inside the second step.

[0064] like Figure 3 and Figure 5 As shown, the detection chamber 1 is also provided with a blocking member 14, which is located at the connection between the protrusion 122 and the cavity 11. The blocking member 14 is arranged in a circular shape, and its outer periphery contacts the inner side of the second step of the protrusion 122. The outer periphery of the blocking member 14 is provided with an external thread, which matches the internal thread on the inner side of the second step. The blocking member 14 is also provided with a first handle 142, through which the blocking member 14 can be screwed to connect with the inner side of the protrusion 122, so as to block the hollow circular opening structure of the glove mounting member 12. When the glove is installed, the blocking member 14 blocks the connection between the glove and the cavity 11, playing a blocking and sealing role; when the blocking member 14 is screwed by the first handle 142, the space formed by the installed glove and the protrusion 122 is connected with the cavity 11 when it is removed. A seventh connecting hole 141 is also provided on the blocking member 14, and the second connecting hole 132 is connected to the seventh connecting hole 141 by a pipeline, so that the vacuum pump 2 can extract air from the space formed by the glove to be tested, the glove mounting member 12 and the blocking member 14 through the second connecting hole 132, the seventh connecting hole 141 and the pipeline therebetween.

[0065] like Figure 6As shown, the detection cabin 1 is also provided with a sealing cover 15 at the other end of the cavity 11. The sealing cover 15 is fixedly connected to the other end of the cavity 11 and is used to seal the cavity 11 to ensure the airtightness of the internal environment of the cavity 11, so as to maintain specific conditions such as low oxygen and low pressure during the glove leakage rate detection process and avoid interference from external factors. Preferably, the sealing cover 15 adopts a precise sealing structure and is tightly matched with the cavity 11 through bolts or other fastening devices to ensure the sealing effect. Further preferably, the sealing cover 15 is configured to be easy to disassemble or replace, facilitate maintenance and maintenance, and extend the service life of the detection device. Further preferably, a second handle 152 is also provided on the sealing cover 15 for easy disassembly or replacement. The airbag assembly 7 is arranged at the end of the cavity 11 close to the sealing cover 15 and is sealed and connected to the sealing cover 15. When the fifth pipeline is connected to the vacuum pump 2, the airbag assembly 7 shrinks and is close to the sealing cover 15. When the fifth pipeline is connected to the nitrogen source 3, the nitrogen source 3 injects nitrogen into the airbag assembly 7, and the airbag assembly 7 expands in a direction away from the sealing cover 15 under the action of nitrogen. The sealing cover 15 is also provided with an eighth connecting hole 151, and the fifth switch valve 33 is connected to the airbag assembly 7 through the eighth connecting hole 151.

[0066] The above structural design creates a low oxygen environment and detects relevant data in real time to accurately detect the leakage rate of the glove box gloves.

[0067] The detection cabin 1 is connected to the vacuum pump 2 and the nitrogen source 3, and cooperates to quickly reduce the oxygen concentration by vacuuming. The vacuum pump 2 reduces the oxygen content in the cavity 11 by exhausting air. The nitrogen source 3 injects nitrogen into the cavity 11 after the vacuum pump 2 works to further replace the oxygen to maintain a low oxygen environment. In order to further reduce the oxygen content in the cavity 11, the end of the cavity 11 is sealed with the sealing cover 15 and the airbag assembly 7 is connected. Nitrogen is injected into the airbag assembly 7 through the nitrogen source 3 to expand its volume, further compressing the air inside the cavity 11 to achieve a lower low oxygen environment. The low oxygen environment control is based on the Clapeyron equation (PV=nRT). At a constant temperature, the pressure (P) is reduced by reducing the amount of substance (n) in the gas in the cabin, thereby achieving rapid deoxygenation. During operation, after the blocking member 14 is installed, the volume inside the cavity 11 is fixed. According to the Clapeyron equation:

[0068] PV=nRT

[0069] Where P is the pressure in the cavity 11, V is the volume in the cavity 11, n is the amount of air in the cavity 11, and R is the molar gas constant. Ignoring temperature fluctuations and volume changes at room temperature, V, R, and T are all constants, and P∝n.

[0070] In terms of data monitoring, the gloves to be tested are first connected to the cavity 11 through the glove mounting member 12. The design of the blocking member 14 and the sealing cover 15 enhances the airtightness of the cavity 11 to avoid interference of the external environment on the test results. The cavity 11 is connected to the thermometer 4, the differential pressure gauge 5 and the oxygen analyzer 6. During the glove leakage rate detection process, relevant data are detected and collected to provide accurate data support for the detection of the glove leakage rate.

[0071] When detecting the leakage rate of the gloves in the glove box, in order to ensure the consistency of the detection conditions, especially to ensure the consistency of the internal volume formed by the gloves to be detected and the cavity 11 during the detection, first, the blocking member 14 is fixed between the glove mounting member 12 and the cavity 11, and the first oxygen concentration change value after the standard gloves are installed is detected by using the standard gloves and the above-mentioned detection device structure, so as to calculate the first leakage rate as the background leakage rate, and the background leakage rate is used to estimate the corrected leakage rate, that is, the third leakage rate; secondly, the blocking member 14 is removed, and the second oxygen concentration change value of the standard gloves is detected; thirdly, after the standard gloves are removed and the gloves to be detected are installed, the third oxygen concentration change value before and after the blocking member 14 is removed is detected again with the help of the above-mentioned detection device, and the required leakage rate result of the gloves to be detected is calculated according to the formula through the second oxygen concentration change value, the third oxygen concentration change value, the first leakage rate (that is, the background leakage rate) and the corrected leakage rate (the third leakage rate).

[0072] In some preferred embodiments, the airbag component 7 can be a long rectangular airbag, a long latex or silicone rubber elastic airbag.

[0073] In some preferred embodiments, the above-mentioned standard gloves are made of high barrier materials such as butyl rubber.

[0074] In some preferred embodiments, in order to further control the size of the detection space, reduce the gas volume of the environment in which the gloves are detected, reduce the potential oxygen leakage of the detection device's own materials, and improve the detection accuracy, the cavity 11 is set to a cylindrical barrel. Preferably, in order to meet the detection requirements of various glove box gloves, the diameter of the cavity 11 is designed to be 200mm-300mm, which is larger than the cuff size of various existing glove box gloves; the axial length of the cavity 11 is designed to be 850mm-950mm, which is larger than the length of various existing glove box gloves.

[0075] In some preferred implementation schemes, in order to increase the air barrier property of the cavity 11 and improve the detection accuracy, the cavity 11 is made of stainless steel.

[0076] In some preferred embodiments, the inner surface of the cavity 11 is coated with a coating, such as an Al2O3 coating, to improve air barrier properties.

[0077] In some preferred embodiments, the thermometer 4 adopts a thermocouple structure to measure the temperature of the gas inside the cavity 11 during the detection process.

[0078] In some preferred embodiments, the differential pressure meter 5 uses a micro differential pressure sensor to measure the relative pressure difference of the gas inside the cavity 11 during the detection process.

[0079] In some preferred embodiments, the sealing cover 15 is connected to the cavity 11 via a sealing clamp.

[0080] In some preferred embodiments, the detection chamber 1 further includes a plurality of support bases 16, which are used to provide a solid foundation for the entire device, ensure that the device remains balanced during operation, and avoid tilting or displacement caused by external forces or internal pressure changes. Preferably, the number of support bases 16 is 2-4.

[0081] The present invention also provides a method for detecting the leakage rate of gloves in a glove box using the above device, comprising the following steps:

[0082] S1: The glove mounting member 12, the blocking member 14 and the sealing cover 15 are sealed and connected to the cavity 11, a first space to be tested is formed between the glove, the glove mounting member 12 and the blocking member 14, and a second space to be tested is formed between the blocking member 14, the cavity 11 and the sealing cover 15; the vacuum pump 2, the nitrogen source 3, the thermometer 4, the differential pressure gauge 5 and the oxygen analyzer 6 are connected through the first connecting hole 131, the second connecting hole 132, the third connecting hole 133, the fourth connecting hole 134, the fifth connecting hole 135, the third connecting hole 136 and the fourth connecting hole 137, respectively. The sixth connecting hole 136 is connected to the cavity 11, and simultaneously forms a first pipeline, a second pipeline and a third pipeline; the pipeline between the first connecting hole 131 and the seventh connecting hole 141 is connected, so that the vacuum pump 2 is further connected to the first test space formed by the glove mounting part 12 and the blocking part 14; outside the cavity 11, the vacuum pump 2 and the nitrogen source 3 are connected to form a fourth pipeline, and a fifth switch valve 33 is set on the fourth pipeline, and the fifth switch valve 33 is connected to the eighth connecting hole 151 to form a fifth pipeline.

[0083] S2: Detect the first oxygen concentration and the second oxygen concentration value through the above structure, obtain the first oxygen concentration change value through calculation, and estimate the background leakage rate (first leakage rate) and the corrected leakage rate (third leakage rate) based on the above first oxygen concentration change value.

[0084] S21: Install the standard glove so that the rolled edge of the standard glove is placed in the annular groove closest to the flange 121, and use O-rings to fix the other two annular grooves so that the standard glove and the glove mounting member 12 are sealed.

[0085] S22: Open the first switch valve 21, and the vacuum pump 2 extracts air in the first test space formed by the standard glove, the glove mounting member 12 and the blocking member 14 through the pipeline between the first connecting hole 131 and the seventh connecting hole 141.

[0086] S23: Close the first switch valve 21, open the third switch valve 31 and the second switch valve 22, the vacuum pump 2 extracts the air in the cavity 11 through the second pipeline, and the nitrogen source 3 fills the cavity 11 with high-purity nitrogen through the third pipeline, that is, the air in the second test space, for multiple cycles; observe the decrease in oxygen concentration in the cavity 11 through the oxygen analyzer 6, and when the oxygen concentration in the cavity 11 reaches a small decrease and is relatively stable, close the third switch valve 31.

[0087] S24: Open the second switch valve 22 and the fourth switch valve 32, and adjust the fifth switch valve 33 so that the pipeline between the nitrogen source 3 and the fifth switch valve 33 and the fifth pipeline are connected. The nitrogen source 3 injects high-purity nitrogen into the airbag assembly 7 through the above pipeline, so that the airbag assembly 7 expands inside the cavity 11. At the same time, the vacuum pump 2 extracts the gas inside the cavity 11 through the second pipeline, and the differential pressure gauge 5 is used to observe the gas pressure inside the wall. After the airbag assembly 7 basically fills the cavity 11, the second switch valve 22 and the fourth switch valve 32 are closed to stop inflation and extraction.

[0088] S25: Open the sixth switch valve 34 and the third switch valve 31 to extract the gas in the airbag assembly 7. At the same time, the nitrogen source 3 injects high-purity nitrogen into the cavity 11 through the third pipeline. Use the differential pressure gauge 5 to observe the gas pressure inside the wall. When the airbag assembly 7 is evacuated and shrinks to fit tightly against the sealing cover 15, close the sixth switch valve 34 and the third switch valve 31.

[0089] S26: Repeat the above S24 to S25 3 to 5 times, and use the oxygen analyzer 6 to observe the oxygen concentration value inside the cavity 11. When the oxygen concentration value drops to ≤50ppm, use the vacuum pump 2 and the differential pressure gauge 5 to adjust the relative pressure inside the cavity 11 to the detection condition, that is, (-1100 to -900) Pa; preferably, the oxygen concentration value is reduced to ≤10ppm.

[0090] S27: After the above detection conditions are stable, the oxygen analyzer 6 is used to record the first oxygen concentration, and the timer (not shown in the figure) is used to count. After a certain period of time, the oxygen analyzer 6 is used to record the second oxygen concentration, and the first oxygen concentration change value is obtained by the first oxygen concentration and the second oxygen concentration value, and the background leakage rate (first leakage rate) of the cavity 11 is calculated based on the first oxygen concentration change value. Preferably, the certain period of time is 30 minutes to 60 minutes.

[0091] S28: using the background leakage rate (first leakage rate) mentioned above, combined with the volume of the cavity 11 itself and the volume of the standard glove after expansion, the corrected leakage rate (third leakage rate) is estimated.

[0092] S3: Through the above structure detection and calculation, the second oxygen concentration change value of the standard glove and the third oxygen concentration change value of the glove to be tested are obtained, and the leakage rate of the glove to be tested is calculated based on the above second oxygen concentration change value, the third oxygen concentration change value and the above corrected leakage rate (third leakage rate).

[0093] S31: The nitrogen source 3 is reconnected to the first connection hole 131. The nitrogen source 3 injects a certain amount of nitrogen into the space formed by the standard glove, the glove mounting member 12, and the blocking member 14 through the pipeline between the first connection hole 131 and the seventh connection hole 141. Under the above gas pressure, the blocking member 14 is pushed into the cavity 11. At this time, the nitrogen source 3 is connected to the third connection hole 133. Due to the negative pressure, the standard glove will automatically expand inside the cavity 11. Figure 8 shown.

[0094] S32: Since the oxygen concentration inside the cavity 11 has been disclosed, repeat the above steps S24 to S25 1 to 2 times, and use the oxygen analyzer 6 to observe the oxygen concentration value inside the cavity 11. When the oxygen concentration value drops to ≤50ppm, use the vacuum pump 2 and the differential pressure gauge 5 to adjust the relative pressure inside the cavity 11 to the detection condition, that is, (-1100 to -900) Pa; preferably, the oxygen concentration value is reduced to ≤10ppm.

[0095] S33: After the above detection conditions are stable, the third oxygen concentration is recorded by the oxygen analyzer 6, and the timer (not shown in the figure) is used to count. After a certain period of time, the fourth oxygen concentration is recorded by the oxygen analyzer 6, and the difference between the third oxygen concentration and the fourth oxygen concentration is used as the second oxygen concentration change value under the standard gloves. Preferably, the certain period of time is 30 minutes to 60 minutes.

[0096] S34: Through the standard glove, the blocking member 14 is screwed and connected to the inner side of the protruding portion 122 of the glove mounting member 12, thereby blocking the hollow circular opening structure of the glove mounting member 12 and sealing it. At this time, the standard glove is removed and the glove to be tested is installed; the first switch valve 21 is opened, and the vacuum pump 2 extracts the air in the space formed by the standard glove, the glove mounting member 12 and the blocking member 14 through the pipeline between the first connecting hole 131 and the seventh connecting hole 141, and the first switch valve 21 is closed.

[0097] S35: The nitrogen source 3 is reconnected to the first connection hole 131. The nitrogen source 3 injects a certain amount of nitrogen into the space formed by the glove to be tested, the glove mounting member 12, and the blocking member 14 through the pipeline between the first connection hole 131 and the seventh connection hole 141. Under the above gas pressure, the blocking member 14 is pushed into the cavity 11. At this time, the nitrogen source 3 is connected to the third connection hole 133. Due to the negative pressure, the glove to be tested will automatically expand inside the cavity 11. Figure 8 shown.

[0098] S36: Since the oxygen concentration inside the cavity 11 has been disclosed, repeat the above steps S24 to S25 1 to 2 times, and use the oxygen analyzer 6 to observe the oxygen concentration value inside the cavity 11. When the oxygen concentration value drops to ≤50ppm, use the vacuum pump 2 and the differential pressure gauge 5 to adjust the relative pressure inside the cavity 11 to the detection condition, that is, (-1100 to -900) Pa; preferably, the oxygen concentration value is reduced to ≤10ppm.

[0099] S37: After the above detection conditions are stable, the fifth oxygen concentration is recorded by the oxygen analyzer 6, and the timer (not shown in the figure) is used to count. After a certain period of time, the sixth oxygen concentration is recorded by the oxygen analyzer 6, and the difference between the fifth oxygen concentration and the sixth oxygen concentration is used as the third oxygen concentration change value under the standard gloves. Preferably, the certain period of time is 30 minutes to 60 minutes.

[0100] S37: Calculate the hourly leakage rate of the gloves to be tested using the following formula:

[0101]

[0102] Where:

[0103] ΔO2——the change in the third oxygen concentration of the glove to be tested, expressed in parts per million (ppm) by volume;

[0104] ΔO1 – the change in oxygen concentration using standard gloves, expressed in parts per million (ppm) by volume;

[0105] t——test duration, min;

[0106] T0——Consider the corrected leakage rate of the device (third leakage rate).

[0107] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A device for detecting the leakage rate of gloves in a glove box using an airbag, characterized in that: include: The detection cabin is provided with a cavity and a glove mounting member, and the outer surface of the cavity is provided with a connection hole assembly, and the connection hole assembly includes a plurality of connection holes; The glove mounting piece is located at one end of the cavity and is fastened thereto; the glove mounting piece is provided with a protruding portion with a hollow circular opening, the outer peripheral surface of the protruding portion is provided with at least one annular groove, a sealing ring is provided on the outer side of the annular groove, the sealing ring clamp fixes the glove to be tested on the annular groove, and the glove to be tested, the protruding portion and the cavity together form a space to be tested; An airbag assembly, the airbag assembly being arranged at one end of the cavity away from the glove mounting member, and the airbag assembly expelling the air inside the cavity by expanding or contracting its own volume; A deoxidation component, the deoxidation component includes a vacuum pump for vacuuming and a nitrogen source for injecting nitrogen, the vacuum pump and the nitrogen source are both arranged outside the cavity, and are respectively connected to the cavity through the connecting hole component, the vacuum pump and the nitrogen source work together to reduce the oxygen content of the space to be detected by combining vacuuming and injecting nitrogen; A data detection component, the data detection component includes a differential pressure gauge and an oxygen analyzer, the differential pressure gauge and the oxygen analyzer are both arranged outside the cavity and connected to the outer surface of the cavity through the connecting hole, and are used to detect the pressure difference and oxygen content of the space to be detected; In the deoxygenation component, outside the cavity, the vacuum pump and the nitrogen source are directly connected to form a fourth pipeline; the airbag component is connected to the fourth pipeline, and in a first state, the vacuum pump is connected to the airbag component to extract the gas inside the airbag component to shrink it, and in a second state, the nitrogen source is connected to the airbag component to inject nitrogen into the airbag component to expand it.

2. The device according to claim 1, characterized in that The airbag assembly is connected to the fourth pipeline to form a fifth pipeline, and a fifth switch valve is arranged at the intersection of the fifth pipeline and the fourth pipeline.

3. The device according to claim 2, characterized in that The fifth switch valve is a three-way switch valve.

4. The device according to claim 1, characterized in that A sealing cover is provided at one end of the cavity away from the glove mounting piece, and the airbag assembly is sealed and connected to the sealing cover.

5. The device according to claim 4, characterized in that The sealing cover is provided with an eighth connecting hole, and the airbag assembly is connected to the fourth pipeline through the eighth connecting hole.

6. The device according to claim 1, characterized in that A circular blocking member is provided at the connection point between the protrusion and the cavity, an internal thread is provided on the inner side of the protrusion, and an external thread is provided on the outer periphery of the blocking member, and the internal and external threads cooperate to ensure that the blocking member is firmly connected to the inner side of the protrusion to block the connection between the protrusion and the cavity.

7. The device according to claim 6, characterized in that The protrusion is arranged in a step structure, including a first step and a second step, the second step is arranged close to the cavity, and the inner side of the second step is provided with the internal thread.

8. The device according to claim 1, characterized in that The number of the annular grooves is ≥3.

9. The device according to claim 8, characterized in that The diameters of the plurality of annular grooves are different so as to adapt to the cuff sizes of the gloves to be tested.

10. The device according to claim 1, characterized in that The connecting hole assembly includes a first connecting hole, a second connecting hole and a third connecting hole. The vacuum pump is connected to the first connecting hole and the second connecting hole, respectively, to form a first pipeline and a second pipeline connected to the cavity; the nitrogen source is connected to the third connecting hole to form a third pipeline connected to the cavity.

11. The device according to claim 10, characterized in that The first pipeline extends inside the cavity to a space formed by the glove mounting piece and the glove to be tested.

12. A method for detecting leakage rate using the device according to any one of claims 1 to 11, characterized in that: include: The glove mounting member, the blocking member and the sealing cover are sealed and connected to the cavity; the vacuum pump, the nitrogen source, the differential pressure gauge and the oxygen analyzer are connected to the cavity through the connecting hole assembly; the vacuum pump and the nitrogen source are connected outside the cavity to form the fourth pipeline, the fifth switch valve is arranged on the fourth pipeline, and the fifth switch valve is connected to the airbag assembly adjacent to the sealing cover through the sealing cover; Installing a standard glove on the glove mounting part, reducing the oxygen content inside the cavity by controlling the vacuum pump, the nitrogen source and the airbag assembly, and detecting and obtaining a first oxygen concentration change value by means of the differential pressure gauge and the oxygen analyzer; estimating a first leakage rate representing the background leakage of the cavity based on the first oxygen concentration change value, and estimating a corrected third leakage rate based on the first leakage rate; The blocking member is removed, and the oxygen content inside the cavity is reduced by controlling the vacuum pump, the nitrogen source and the airbag assembly, and the second oxygen concentration change value is detected and calculated by means of the differential pressure gauge and the oxygen analyzer; after the blocking member is installed and the standard glove is replaced with the glove to be tested, the blocking member is removed again, and the oxygen content inside the cavity is reduced by controlling the vacuum pump, the nitrogen source and the airbag assembly, and the third oxygen concentration change value is detected and calculated by means of the differential pressure gauge and the oxygen analyzer; based on the third leakage rate, the second oxygen concentration change value and the third oxygen concentration change value, the hourly leakage rate of the glove to be tested is calculated according to the following formula: Where: ΔO2——the third oxygen concentration change value of the glove to be tested, expressed in parts per million (ppm) by volume; ΔO1——the second oxygen concentration change value using standard gloves, expressed in parts per million (ppm) by volume; t——test duration, min; T0 - taking into account the corrected leak rate of the cavity (third leak rate).

13. The detection method according to claim 12, characterized in that: The vacuum pump, the nitrogen source and the airbag assembly reduce the oxygen content by the following steps: The first pipeline is provided with a first switch valve, and when the first switch valve is opened, the vacuum pump extracts the internal air of the space formed by the standard glove, the glove mounting member and the blocking member through the first pipeline; The second pipeline and the third pipeline are respectively provided with a second switch valve and a third switch valve, the first switch valve is closed, the second switch valve and the third switch valve are opened, the vacuum pump extracts the internal air of the cavity, and the nitrogen source injects nitrogen into the cavity; Adjusting the fifth switch valve so that the nitrogen source is connected to the fifth pipeline, the nitrogen source injects nitrogen into the airbag assembly so that the airbag assembly expands in the cavity, and at the same time, the vacuum pump extracts air from the cavity through the second pipeline; Adjusting the fifth switch valve so that the vacuum pump is connected to the fifth pipeline, the vacuum pump extracts gas in the airbag assembly, so that the airbag assembly shrinks in the cavity until it is tightly attached to the sealing cover; The above process is repeated to reduce the oxygen content inside the cavity through the expansion or contraction of the airbag assembly in coordination with the vacuum pump and the nitrogen source, and the oxygen concentration value inside the cavity is observed using the oxygen analyzer until it is reduced to the required oxygen content detection condition.

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