A device and method for detecting glove leakage rate of a glove box using an air bag

Abstract

The application discloses a device and method for detecting glove leakage rate of glove box by using air bag, which adopts air bag assembly to realize rapid oxygen removal through volume expansion and contraction, provides low oxygen environment, so as to accurately detect air permeability of gloves. The device comprises a cavity, one end of the cavity is provided with a glove mounting part and is sealingly connected with a glove to be detected. Through the cooperative operation of a vacuum pump and a nitrogen source, the oxygen concentration change in the cavity is accurately monitored by using a differential pressure gauge and an oxygen analyzer, so that the influence of background leakage is effectively eliminated, and accurate detection data is provided. The device has simple and convenient design structure, contains different size ring grooves to adapt to various glove specifications, and meets the detection requirements of gloves with different materials and diameters. The device does not need a complex adsorption circulation system or a high vacuum degree equipment, and only relies on the air bag assembly and the vacuum pump to quickly reduce the oxygen concentration to ppm level, so as to realize an integrated and standardized detection process, and reduce the operation and maintenance cost.

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 method for detecting the leakage rate of gloves in a glove box by utilizing an airbag. Background Art

[0002] Sealed glove box operations are a crucial aspect of radiation protection. Because glove boxes often contain toxic, hazardous, or radioactive materials, the barrier properties of glove box gloves are crucial. Glove box gloves must possess excellent barrier properties to prevent harmful substances from penetrating the gloves and endangering worker health. Furthermore, certain operations require specific environments, such as inert gas, which necessitates gloves with excellent air barrier properties to reduce the penetration of external oxygen and ensure an undisturbed atmosphere within the box.

[0003] Generally, the barrier properties of glove box gloves refer to two aspects: one is the barrier to penetration, and the other is the barrier to permeation. Penetration refers to the entry of gas or substances into the box through tears or holes in the glove material; while permeation refers to the gradual passage of gas molecules through the protective material through dissolution and molecular motion within the glove material, a process that is usually difficult to detect. Penetration testing is relatively simple, such as using the pressure drop method to detect tears or holes in gloves. Permeation performance is more complex and requires characterization through leakage rate. The leakage rate directly reflects the glove material's barrier properties to air or substance penetration.

[0004] Currently, several different methods for testing glove permeability under penetration mechanisms have been proposed. For example, patent CN109655213A proposes using pressure sensors to test glove airtightness. However, this method only detects damage and is ineffective at assessing the permeability of intact gloves. Patent CN109374225A utilizes negative pressure and pressure changes to determine the tightness of a glove box. However, this method tests the overall leakage of the glove box and cannot assess the air barrier properties of individual gloves. These technologies all primarily rely on physical damage detection and are unable to characterize the air permeability of intact gloves.

[0005] Meanwhile, existing glove leak rate testing methods typically remove oxygen from low-oxygen environments through nitrogen dilution combined with oxygen purification adsorption columns. However, these columns require high-efficiency catalysts, which are costly and have a limited lifespan. They require regular replacement during use, and the oxygen purification process is time-consuming. In contrast, physical deoxygenation methods offer higher efficiency and lower cost, capable of reducing oxygen concentrations to the ppm level in a shorter time. Targeted solutions for physical deoxygenation are urgently needed.

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

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

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

[0009] The detection chamber is provided with a cavity and a glove mounting member. The outer surface of the cavity is provided with a connection hole assembly, which includes a plurality of connection holes. The glove mounting member is located at one end of the cavity and is fastened thereto. The glove mounting member is provided with a protrusion with a hollow circular opening. The outer peripheral surface of the protrusion is provided with at least one annular groove. The outer side of the annular groove is provided with a sealing ring. The sealing ring clamp fixes the glove to be tested to the annular groove. The glove to be tested, the protrusion and the cavity together form a space to be tested.

[0010] An airbag assembly is disposed inside the cavity at one end away from the glove mounting member. The airbag assembly expands or contracts by itself, squeezing out the air inside the cavity.

[0011] 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 the connecting hole assembly. The vacuum pump and the nitrogen source work together to reduce the oxygen content of the space to be inspected by combining vacuuming and nitrogen injection;

[0012] The data detection component 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 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. In the first state, the vacuum pump is connected to the airbag component, extracting the gas inside the airbag component to shrink it. In the second state, the nitrogen source is connected to the airbag component, and nitrogen is injected into the interior of the airbag component 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 sealed 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 piece is arranged at the communication position of the convex part and the cavity, an inner thread is arranged inside the convex part, an outer thread is arranged on the outer periphery of the blocking piece, and the inner thread and the outer thread are matched to fasten the blocking piece to the inside of the convex part to block the communication between the convex part and the cavity.

[0019] As a preferred technical solution, the convex part is arranged in a stepped structure, including a first step and a second step, and the second step is arranged close to the cavity, and an inner thread is arranged inside the second step.

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

[0021] As a preferred technical solution, the diameters of the plurality of ring grooves are different to adapt to the sizes of the cuffs of different gloves to be detected.

[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 with the first connecting hole and the second connecting hole respectively to form a first pipeline and a second pipeline connected with the cavity, and the nitrogen source is connected with the third connecting hole to form a third pipeline connected with the cavity.

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

[0024] According to another aspect of the present application, a detection method for detecting the leakage rate by using the above device is also provided, which includes:

[0025] The glove mounting part, the blocking piece and the sealing cover are sealingly connected with the cavity, the vacuum pump, the nitrogen source, the differential pressure meter and the oxygen analyzer are connected with 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 with the air bag assembly close to the sealing cover through the sealing cover;

[0026] The standard glove is mounted on the glove mounting part, the oxygen content inside the cavity is reduced by controlling the vacuum pump, the nitrogen source and the air bag assembly, the first oxygen concentration change value is detected by the differential pressure meter and the oxygen analyzer, the first leakage rate representing the background leakage of the cavity is estimated based on the first oxygen concentration change value, and the third leakage rate after correction is estimated based on the first leakage rate.

[0027] The blocking member is removed, and the oxygen content inside the cavity is reduced by controlling the vacuum pump, nitrogen source, and airbag assembly. A second oxygen concentration change value is detected and calculated using a differential pressure gauge and an oxygen analyzer. After installing the blocking member and replacing the standard glove 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, nitrogen source, and airbag assembly. A third oxygen concentration change value is detected and calculated using a differential pressure gauge and an 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:

[0028]

[0029] Where:

[0030] ΔO2 – the change in oxygen concentration in the third test glove, expressed in parts per million (ppm) by volume;

[0031] ΔO1 – the change in oxygen concentration using a standard glove, 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] A first on-off valve is provided on the first pipeline. When the first on-off 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 on-off valve and a third on-off valve. The first on-off valve is closed, and the second on-off valve and the third on-off valve are opened. The vacuum pump extracts the internal air of the cavity, and the nitrogen source injects nitrogen into the cavity.

[0037] Adjust the fifth on-off valve so that the nitrogen source is connected to the fifth pipeline. The nitrogen source injects nitrogen into the airbag assembly, causing the airbag assembly to expand within the cavity. At the same time, the vacuum pump extracts air from the cavity through the second pipeline.

[0038] Adjust the fifth on-off valve so that the vacuum pump is connected to the fifth pipeline. The vacuum pump extracts gas from the airbag assembly, causing the airbag assembly to shrink within 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 conjunction with the action of the vacuum pump and nitrogen source, to 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 solutions adopted by the present application can achieve at least one of the following beneficial effects:

[0041] 1. The present application uses the volume expansion and contraction of the air bag assembly to physically regulate the air in the cabin, which can achieve rapid oxygen removal. Compared with traditional adsorption or chemical methods, the present application can reduce the oxygen concentration to the ppm level in a short time by simply operating the air bag assembly and vacuum pump, saving the use of chemical reagents and reducing the operation and maintenance costs.

[0042] 2. The present application cooperates the vacuum pump and the nitrogen source to provide a low-oxygen environment, and monitors the oxygen concentration change through a precision differential pressure gauge and an oxygen analyzer, effectively eliminates the background leakage of the detection device, makes the detection result more accurate, and accurately reflects the air permeability of the glove material.

[0043] 3. The present application has simple and wide adaptability, and can meet the detection requirements of gloves of different materials and diameters. By setting different size ring grooves, the device can quickly adapt to the cuff size of various gloves to be tested, and realize integrated and standardized detection process.

[0044] 4. The overall structure of the present application is simple and convenient to design, and does not need a complex adsorption circulation system or a high vacuum degree air extraction device, but only relies on the air bag assembly and the basic air extraction pump to achieve good test results, and has low maintenance cost, which meets the use conditions of most laboratories and production environments. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, which constitutes a part of the present application. The schematic embodiments of the present application and their description and explanation do not constitute an improper limitation on the present application. In the drawings:

[0046] Figure 1 It is a working principle schematic diagram of a glove box glove leakage rate detection device using an air bag of the present application;

[0047] Figure 2 It is a structure schematic diagram of the expansion or contraction state of the air bag assembly of the present application;

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

[0049] Figure 4 It is a structure schematic diagram of the glove mounting member of the present application;

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

[0051] Figure 6 Fig. 1 is a perspective view of a detection cabin for installing a sealing cover of the present application;

[0052] Figure 7 Fig. 2 is a structural view of a glove mounting member for installing a standard glove or a glove to be detected of the present application;

[0053] Figure 8 Fig. 3 is a view of a standard glove or a glove to be detected of the present application in a detection state;

[0054] Figure 9 Fig. 4 is a detection flowchart of a device for detecting a glove leakage rate of a glove box using an air bag of the present application.

[0055] BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 1. detection cabin; 11. cavity; 12. glove mounting member; 121. flange portion; 122. protruding portion; 13. connecting hole assembly; 131. first connecting hole; 132. second connecting hole; 133. third connecting hole; 134. fourth connecting hole; 135. fifth connecting hole; 136. sixth connecting hole; 14. blocking member; 141. seventh connecting hole; 142. first handle; 15. sealing cover; 151. eighth connecting hole; 152. second handle; 16. support base; 2. vacuum pump; 21. first on-off valve; 22. second on-off valve; 3. nitrogen source; 31. third on-off valve; 32. fourth on-off valve; 33. fifth on-off valve; 34. sixth on-off valve; 4. thermometer; 5. differential pressure gauge; 6. oxygen analyzer; 7. air bag assembly. DETAILED DESCRIPTION

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

[0058] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting" and "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or magnetic connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

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

[0060] In order to solve the problems existing in the prior art, the embodiment of the present invention provides a device for detecting the leakage rate of gloves in a glove box using an airbag, such as Figures 1-8 As shown, it includes a detection chamber 1, and 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 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 interior of the cavity 11. Figure 3 As shown, these six connection holes are respectively a first connection hole 131, a second connection hole 132, a third connection hole 133, a fourth connection hole 134, a fifth connection hole 135, and a 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 chamber 11 through the first connection hole 131 and the second connection hole 132. It is used to achieve an efficient deoxygenation process by adjusting the air pressure inside the detection chamber 1. That is, it extracts air from the chamber 11, reducing the oxygen content therein, thereby creating a low-oxygen environment for accurate detection of glove box glove leakage. The vacuum pump 2 is connected to the first connection hole 131 via a first pipeline. A first on-off valve 21 is provided on the first pipeline to control the on-off of the first pipeline. The vacuum pump 2 is connected to the second connection hole 132 via a second pipeline. A second on-off 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 via a third connecting hole 133. The nitrogen source 3 and the third connecting hole 133 are connected via a third pipeline, which is provided with a third on-off valve 31 for controlling the on-off of the third pipeline. The nitrogen source 3 works in conjunction with the vacuum pump 2 to provide a low-oxygen environment within the cavity 11. The nitrogen source 3 assists the vacuum pump 2 in achieving a more stable and precise deoxygenation effect. Specifically, after the vacuum pump 2 is evacuated, the nitrogen source 3 injects nitrogen into the cavity 11 to displace any residual oxygen, further reducing the oxygen concentration. A third on-off valve 31 is provided on the pipeline connecting the nitrogen source 3 and the third connecting hole 133 to control the on-off of the aforementioned pipeline.

[0061] In order to further improve the deoxidation 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 is squeezed 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 outside the cavity 11, 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 connected with the air bag assembly 7 through a 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 with the fifth switch valve 33 and the fourth pipeline section where the vacuum pump 2 is connected with the fifth switch valve 33. In the first state, when the fifth switch valve 33 is turned on to make the fifth pipeline communicate and be connected with the vacuum pump 2, the sixth switch valve 34 is opened, and the vacuum pump 2 extracts the air inside the cavity 11 and the gas inside the air bag assembly 7 at the same time, so that the air bag assembly 7 is in a tightening state; in the second state, the fifth switch valve 33 is adjusted to make the fifth pipeline communicate and be connected with the nitrogen source 3, and the fourth switch valve 32 is opened, so that the nitrogen gas of the nitrogen source 3 is injected into the air bag assembly 7 to make the volume of the air bag assembly 7 expand, and the gas in the cavity 11 is further extruded and compressed, so that the oxygen removal effect in the cavity 11 is better.

[0062] The thermometer 4 is connected with the cavity 11 through a fourth connecting hole 134, and is used for monitoring the temperature inside the cavity 11 in real time, so that the glove box glove leakage rate detection process is carried out under stable and suitable temperature conditions. The differential pressure gauge 5 is connected with the cavity 11 through a fifth connecting hole 135, and is used for monitoring the relative pressure difference of the gas inside the cavity 11 in real time. The oxygen analyzer 6 is connected with the cavity 11 through a sixth connecting hole 136, and can detect the trace oxygen level inside the cavity 11 in real time and accurately, and provide core data support for the leakage rate detection. The above-mentioned thermometer 4, differential pressure gauge 5 and oxygen analyzer 6 jointly constitute a data detection assembly of the device, and output corresponding detection data by detecting the temperature, pressure difference and oxygen content.

[0063] As shown in Figure 2-Figure 6 As shown in Figure 2 and Figure 3As shown, the glove mounting member 12 comprises a flange portion 121 and a protruding portion 122. The flange portion 121 is a circular flange structure, and a plurality of mounting holes are uniformly distributed on the flange for bolts or screws to pass through and fixedly connected with one end of the cavity 11. The protruding portion 122 is used for fixing the gloves to be detected, and is provided in a hollow circular opening structure, and a plurality of annular grooves are provided on the outside of the protruding portion 122 for mounting the gloves to be detected. Further, the number of annular grooves is provided as at least three, and the diameters of the three annular grooves are provided as three different interface sizes, for example, 160mm, 180mm, and 200mm. According to needs, other diameter sizes can also be provided. O-rings are provided at the annular grooves, and when the gloves to be detected are mounted, the cuffs are placed at the positions of the annular grooves and fixed through the O-rings, and at the same time, the O-rings can maximize the reduction of oxygen leakage at the glove mounting member 12, and achieve a good sealing effect. The inside of the protruding portion 122 is provided in a stepped structure, the inside of the protruding portion 122 corresponding to the annular grooves is a first step, and the inside of the protruding portion 122 between the annular grooves and the flange portion 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 provided on the inside of the second step.

[0064] As shown in Figure 3 and Figure 5 As shown, the detection cabin 1 is also provided with a blocking member 14 located at the communication position of the protruding portion 122 and the cavity 11. The blocking member 14 is provided in a circular shape, and the outer periphery of the blocking member 14 is in contact with the inside of the second step of the protruding portion 122. An external thread is provided on the outer periphery of the blocking member 14 and matched with the internal thread on the inside of the second step. A first handle 142 is also provided on the blocking member 14, and the blocking member 14 can be screwed with the inside of the protruding portion 122 through the first handle 142 to block the hollow circular opening structure of the glove mounting member 12. In the glove mounting state, the blocking member 14 blocks the communication position of the gloves and the cavity 11, and plays a blocking and sealing role. When the blocking member 14 is screwed through the first handle 142, the space formed by the gloves and the protruding portion 122 is communicated with the cavity 11. A seventh connecting hole 141 is also provided on the blocking member 14, and the second connecting hole 132 and the seventh connecting hole 141 are connected through a pipeline, so that the vacuum pump 2 can extract air from the space formed by the gloves to be detected, 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] As shown in Figure 6As shown, the detection chamber 1 is further 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 fitted with the cavity 11 by 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 servicing, and extend the service life of the detection device. Further preferably, the sealing cover 15 is also provided with a second handle 152 for easy disassembly or replacement. The airbag assembly 7 is disposed at the end of the cavity 11 near the sealing cover 15 and is sealed to the sealing cover 15. When the fifth pipeline is connected to the vacuum pump 2, the airbag assembly 7 contracts and clings 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, causing it to expand away from the sealing cover 15. The sealing cover 15 also has an eighth connection hole 151, through which the fifth on-off valve 33 is connected to the airbag assembly 7.

[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 pumping air. The nitrogen source 3 injects nitrogen into the cavity 11 after the vacuum pump 2 is working 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 with an airbag assembly 7. 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 an even 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 within cavity 11, V is the volume within cavity 11, n is the amount of air in cavity 11, and R is the molar gas constant. At room temperature, ignoring temperature fluctuations and volume changes, V, R, and T are all constants, so P ∝ n.

[0070] Regarding data monitoring, the glove to be tested is first connected to the chamber 11 via the glove mounting assembly 12. The design of the barrier 14 and sealing cover 15 enhances the airtightness of the chamber 11, preventing external interference with the test results. The chamber 11 is connected to a thermometer 4, a differential pressure gauge 5, and an oxygen analyzer 6. During the glove leakage test, relevant data is detected and collected, providing accurate data support for glove leakage testing.

[0071] When testing the leakage rate of a glove in a glove box, to ensure consistency in testing conditions, particularly consistency in the internal volume formed by the glove to be tested and the cavity 11 during testing, first, the barrier 14 is secured between the glove mounting member 12 and the cavity 11. Using a standard glove and the aforementioned testing device structure, a first oxygen concentration change after the standard glove is installed is measured, thereby calculating a first leak rate, which serves as the background leak rate. This background leak rate is then used to estimate a corrected leak rate, i.e., the third leak rate. Secondly, the barrier 14 is removed, and a second oxygen concentration change of the standard glove is measured. Thirdly, after the standard glove is removed and the glove to be tested is installed, the aforementioned testing device is again used to measure the third oxygen concentration change before and after the barrier 14 is removed. Using the second and third oxygen concentration changes, as well as the first leak rate (i.e., the background leak rate) and the corrected leak rate (i.e., the third leak rate), the desired leakage rate of the glove to be tested is calculated according to a formula.

[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, to further control the size of the testing space, reduce the volume of the ambient gas during glove testing, minimize potential oxygen leakage from the testing device's own materials, and improve testing accuracy, cavity 11 is configured as a cylindrical barrel. Preferably, to meet the testing requirements of various glove box gloves, cavity 11 has a diameter of 200mm-300mm, larger than the cuff size of existing glove box gloves; and an axial length of 850mm-950mm, larger than the length of existing glove box gloves.

[0075] In some preferred embodiments, 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 gauge 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 to provide a solid foundation for the entire device, ensuring that the device remains balanced during operation and preventing tilting or displacement due to 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 barrier 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 barrier member 14, and a second space to be tested is formed between the barrier 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 and the third connecting hole 136, 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 curled 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 from 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, and the vacuum pump 2 extracts the air in the cavity 11 through the second pipeline. 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. 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 uses the differential pressure gauge 5 to observe the gas pressure inside the wall. After the airbag assembly 7 basically fills the interior of the cavity 11, close the second switch valve 22 and the fourth switch valve 32, and 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-mentioned detection conditions stabilize, the first oxygen concentration is recorded using the oxygen analyzer 6, and a timer (not shown) is used to measure the time. After a certain period of time, the second oxygen concentration is recorded using the oxygen analyzer 6. A first oxygen concentration change value is obtained by using the first oxygen concentration and the second oxygen concentration values. 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 above background leakage rate (first leakage rate), combined with the volume of the cavity 11 itself and the volume of the standard glove after expansion, a corrected leakage rate (third leakage rate) is estimated.

[0092] S3: The second oxygen concentration change value of the standard glove and the third oxygen concentration change value of the glove to be tested are detected and calculated by the above structure, 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 barrier member 14 through the pipeline between the first connection hole 131 and the seventh connection hole 141. Under the above-mentioned gas pressure, the barrier 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 determined, 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-mentioned detection conditions stabilize, the third oxygen concentration is recorded using the oxygen analyzer 6. A timer (not shown) is used to measure the time. After a predetermined period of time, the fourth oxygen concentration is recorded using the oxygen analyzer 6. The difference between the third and fourth oxygen concentrations is used as the second oxygen concentration change value under the standard glove. Preferably, the predetermined period of time is 30 to 60 minutes.

[0096] S34: Using a standard glove, screw the blocking member 14 into place, connecting it to the inner side of the protrusion 122 of the glove mounting member 12. This blocks the hollow circular opening of the glove mounting member 12, sealing it. At this point, the standard glove is removed and the glove to be tested is installed. The first on-off valve 21 is opened, and the vacuum pump 2 extracts air from the space formed by the standard glove, the glove mounting member 12, and the blocking member 14 through the pipe between the first connecting hole 131 and the seventh connecting hole 141. The first on-off valve 21 is then closed.

[0097] S35: The nitrogen source 3 is reconnected to the first connecting 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 connecting hole 131 and the seventh connecting hole 141. Under the above-mentioned gas pressure, the blocking member 14 is pushed into the cavity 11. At this time, the nitrogen source 3 is connected to the third connecting 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 determined, 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-mentioned detection conditions stabilize, the fifth oxygen concentration is recorded using the oxygen analyzer 6. A timer (not shown) is used to measure the time. After a predetermined period of time, the sixth oxygen concentration is recorded using the oxygen analyzer 6. The difference between the fifth and sixth oxygen concentrations is used as the third oxygen concentration change value under the standard glove. Preferably, the predetermined period of time is 30 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 oxygen concentration in the third test glove, expressed in parts per million (ppm) by volume;

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

[0105] t——test duration, min;

[0106] T0 - Consider the device correction leakage rate (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 methods. The above-mentioned specific implementation methods are merely illustrative and not 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 protected by 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 member is located at one end of the cavity and is fastened thereto; the glove mounting member 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, the outer side of the annular groove is provided with a sealing ring, and the sealing ring clamp fixes the glove to be tested on the annular groove. 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 disposed inside the cavity at one end away from the glove mounting member, and the airbag assembly expelling the air inside the cavity by expanding or contracting its own volume; a deoxygenation component, the deoxygenation component including a vacuum pump for vacuuming and a nitrogen source for injecting nitrogen, the vacuum pump and the nitrogen source both being disposed outside the cavity and connected to the cavity through the connecting hole assembly, the vacuum pump and the nitrogen source working in conjunction to reduce the oxygen content of the space to be inspected by combining vacuuming and nitrogen injection; a data detection component, the data detection component including 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. In the first state, the vacuum pump is connected to the airbag component to extract the gas inside the airbag component to cause it to shrink. In the second state, the nitrogen source is connected to the airbag component to inject nitrogen into the airbag component to cause it to expand.

2. The device according to claim 1, characterized in that The airbag assembly is connected to the fourth pipeline to form a fifth pipeline. A fifth switch valve is provided 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 3, 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 sealedly connected to the sealing cover.

5. The device according to claim 4, characterized in that 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.

6. The device according to claim 5, 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. 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 configured as a step structure, including a first step and a second step, the second step is configured close to the cavity, and the inner side of the second step is configured with the internal thread.

8. The device according to claim 7, 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 to accommodate different cuff sizes of the gloves to be tested.

10. The device according to claim 9, 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 leak rate detection using the device according to claim 11, characterized in that: include: The glove mounting member, the blocking member, and the sealing cover are sealedly 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; outside the cavity, the vacuum pump and the nitrogen source are connected to form the fourth pipeline, the fifth switch valve is provided on the fourth pipeline, and the fifth switch valve is connected to the airbag assembly adjacent to the sealing cover through the sealing cover; Mounting a standard glove on the glove mounting member, 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 using the differential pressure gauge and the oxygen analyzer; estimating a first leak rate representing a background leakage condition of the cavity based on the first oxygen concentration change value, and estimating a corrected third leak rate based on the first leak 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. A second oxygen concentration change value is detected and calculated using the differential pressure gauge and the oxygen analyzer. After installing the blocking member and replacing the standard glove 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. A third oxygen concentration change value is detected and calculated using 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 using the glove to be tested, expressed in parts per million (ppm) by volume; ΔO1 - the change in the second oxygen concentration using standard gloves, expressed in parts per million (ppm) by volume; t——test duration, min; T0 - the corrected leak rate taking into account the cavity.

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 on-off valve. When the first on-off 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. A second on-off valve and a third on-off valve are respectively provided on the second pipeline and the third pipeline. The first on-off valve is closed, and the second on-off valve and the third on-off valve are opened. The vacuum pump extracts the air inside the cavity, and the nitrogen source injects nitrogen into the cavity. Adjusting the fifth on-off valve so that the nitrogen source is connected to the fifth pipeline, the nitrogen source injects nitrogen into the airbag assembly, causing the airbag assembly to expand within 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 from the airbag assembly, causing the airbag assembly to shrink within the cavity until it is tightly attached to the sealing cover; Repeat the above process, through the expansion or contraction of the airbag assembly, in conjunction with the action of the vacuum pump and the nitrogen source, to 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 condition.

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