A device and method for detecting glove leakage rate of a glove box by removing oxygen with vacuum

Abstract

The application discloses a device and a detection method for detecting glove leakage rate of a glove box by vacuum oxygen removal, and relates to the technical field of glove box detection. The device comprises a detection cabin, which is provided with a cavity and a glove mounting part; the outer surface of the cavity is provided with a connecting hole assembly, and the connecting hole assembly comprises a plurality of connecting holes; the glove mounting part is located at one end of the cavity and is fastened to the cavity; the glove mounting part is provided with a convex part with a hollow circular opening; a glove to be detected, the convex part and the cavity jointly form a detection space; an oxygen removal system comprises a vacuum pump and a nitrogen source; the vacuum pump and the nitrogen source are both arranged outside the cavity and are connected to the outer surface of the cavity through the connecting hole assembly; the vacuum pump and the nitrogen source work cooperatively to reduce the oxygen content in the detection space and provide a low-oxygen environment by means of vacuum pumping and nitrogen injection. The application adopts a physical method to quickly reduce the oxygen concentration to ppm level, does not require a complicated oxygen adsorption circulation system, and does not require high vacuum degree, thereby reducing equipment cost and simplifying operation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of individual radiation protection equipment detection, and particularly relates to a device and a detection method for detecting glove leakage rate of a glove box by vacuum oxygen removal. BACKGROUND

[0002] In experiments and production processes, the sealing property of gloves in a closed glove box is highly required. The glove is an important part of the glove box, forms a sealed box chamber environment, protects the safety of the operator and maintains the specific atmosphere in the box. There may be toxic, harmful or radioactive substances in the glove box, and the glove must have good barrier property to avoid harmful substances penetrating into the external environment through the glove, endangering the safety of the workers. In addition, some experiments are carried out in an inert gas or low-oxygen environment, which also requires the glove to block the penetration of external air to prevent oxygen from entering the glove box and affecting the experimental atmosphere.

[0003] The leakage paths of air or other substances through the glove material mainly include penetration and permeation. Penetration refers to the phenomenon that substances pass through the material due to damage or holes of the glove material, which is relatively easy to detect. Such gloves are considered as unqualified products and cannot meet the safety use requirements. Permeation refers to the process that substances pass through the glove material itself, which involves the steps of molecular adsorption, diffusion and desorption. It is relatively complex to quantitatively analyze the permeation leakage. In order to measure the permeability of the glove material, the leakage rate is usually used to represent the rate of air permeating through the glove material.

[0004] There is no detection standard for the permeation leakage rate of the glove in the prior art, and there is also a lack of a special detection device to accurately and quantitatively reflect the permeability of the glove material, so there is an urgent need for a special device and method to test the leakage rate of the glove itself.

[0005] In view of the above problems, the present application is proposed. SUMMARY

[0006] The present application discloses a device and a detection method for detecting the leakage rate of a glove box glove by vacuum oxygen removal, and aims to solve the technical problems in the prior art.

[0007] According to one aspect of the present application, a device for detecting the leakage rate of a glove box glove by vacuum oxygen removal is provided, comprising:

[0008] The detection cabin is provided with a cavity and a glove mounting piece. An outer surface of the cavity is provided with a connecting hole assembly, which comprises a plurality of connecting holes. The glove mounting piece is located at one end of the cavity and is fixedly connected thereto. The glove mounting piece is provided with a hollow circular opening protruding portion, an outer peripheral surface of the protruding portion is provided with at least one annular groove, and an outer side of the annular groove is provided with a sealing ring. The sealing ring clamps and fixes a to-be-detected glove on the annular groove. The to-be-detected glove, the protruding portion and the cavity jointly form a to-be-detected space.

[0009] The oxygen removal system comprises a vacuum pump and a nitrogen source. Both the vacuum pump and the nitrogen source are arranged outside the cavity and are connected to the outer surface of the cavity through the connecting hole assembly. The vacuum pump and the nitrogen source work cooperatively to reduce the oxygen content in the to-be-detected space by means of vacuumizing and nitrogen injection, thereby providing a low-oxygen environment.

[0010] The data acquisition system comprises a differential pressure gauge and an oxygen analyzer. Both the differential pressure gauge and the oxygen analyzer are arranged outside the cavity and are connected to the outer surface of the cavity through the connecting hole assembly. The differential pressure gauge and the oxygen analyzer are used to detect the pressure difference and the oxygen content of the to-be-detected space and output corresponding detection data.

[0011] As a preferred technical solution, a circular blocking piece is arranged at the communication position of the protruding portion and the cavity. An inner thread is arranged on the inner side of the protruding portion, and an outer thread is arranged on the outer periphery of the blocking piece. The inner and outer threads are matched to tightly connect the blocking piece to the inner side of the protruding portion, so as to block the communication between the protruding portion and the cavity. The blocking piece divides the to-be-detected space into a first to-be-detected space and a second to-be-detected space. The first to-be-detected space is formed between the to-be-detected glove, the protruding portion and the blocking piece, and the second to-be-detected space is formed between the blocking piece and the cavity.

[0012] As a preferred technical solution, the protruding portion is arranged in a stepped structure, comprising a first step and a second step. The second step is arranged close to the cavity, and an inner thread is arranged on the inner side of the second step.

[0013] As a preferred technical solution, the first step is arranged away from the cavity, and at least one annular groove is arranged on the outer peripheral surface of the first step.

[0014] As a preferred technical solution, the number of annular grooves is ≥3.

[0015] As a preferred technical solution, the diameters of the plurality of annular grooves are different, so as to adapt to the sizes of the cuffs of different to-be-detected gloves.

[0016] As a preferred technical solution, a first connecting hole is arranged on the outer peripheral surface of the first step, and the vacuum pump is connected to the first to-be-detected space through the first connecting hole.

[0017] As a preferred technical scheme, the glove mounting member is further provided with a flange part connected with the protruding part, the flange part is a circular flange structure, directly contacts with the end face of the cavity, and is used for fastening connection with the cavity.

[0018] As a preferred technical scheme, the detection cabin is further provided with a sealing cover, the sealing cover is fastened to the other end of the cavity, and is used for sealing the cavity.

[0019] As a preferred technical scheme, the data acquisition system further comprises a thermometer, the thermometer is connected with the cavity through the connecting hole assembly, and is used for detecting the gas temperature inside the cavity.

[0020] According to another aspect of the present application, a detection method for detecting the leakage rate by using the above device is further provided, comprising:

[0021] The glove mounting member, the blocking member and the sealing cover are fastened to the cavity to form a first detection space and a second detection space; the vacuum pump, the nitrogen source, the differential pressure gauge and the oxygen analyzer are connected with the cavity through the connecting hole assembly;

[0022] The standard glove is mounted on the glove mounting member, the internal oxygen content of the first detection space and the second detection space is reduced by controlling the vacuum pump and the nitrogen source, the first oxygen concentration change value is detected by the differential pressure gauge 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;

[0023] The blocking member is removed, the internal oxygen content of the cavity is reduced by controlling the vacuum pump and the nitrogen source, the second oxygen concentration change value is detected and calculated by the differential pressure gauge and the oxygen analyzer; after the blocking member is mounted and the standard glove is replaced by the glove to be detected, the blocking member is removed again, the internal oxygen content of the cavity is reduced by controlling the vacuum pump and the nitrogen source, the third oxygen concentration change value is detected and calculated by the differential pressure gauge and the oxygen analyzer; the hourly leakage rate of the glove to be detected is calculated based on the third leakage rate, the second oxygen concentration change value and the third oxygen concentration change value according to the following formula:

[0024]

[0025] In the formula:

[0026] OD2 is the third oxygen concentration change value of the glove to be detected, expressed in volume parts per million (ppm);

[0027] OD1 is the second oxygen concentration change value of the standard glove, expressed in volume parts per million (ppm);

[0028] t is the test duration, min;

[0029] T0 - consider the modified leakage rate of the chamber (third leakage rate).

[0030] As a preferred technical solution, the vacuum pump and the nitrogen source reduce the oxygen content inside the chamber, comprising:

[0031] The vacuum pump and the chamber, the vacuum pump and the protruding part are respectively provided with two connecting pipelines, and the two connecting pipelines are respectively provided with first and second switch valves, the first switch valve is opened and the second switch valve is kept closed, and the internal air of the first space to be detected is extracted;

[0032] The first switch valve is closed, and the second switch valve is opened, and the internal air of the second space to be detected is extracted;

[0033] The third switch valve is arranged on the connecting pipeline of the nitrogen source and the chamber, the second switch valve is closed and the third switch valve is opened, and high-purity nitrogen is injected into the chamber;

[0034] The above process is repeated, and the oxygen concentration value inside the chamber is observed by using the oxygen analyzer until it is reduced to the required oxygen content detection condition.

[0035] The technical scheme adopted by the present application can at least achieve one of the following beneficial effects:

[0036] 1. The present application proposes an innovative glove leakage rate detection method, that is, for the leakage problem of the glove box glove, the device and method for leakage detection by using the oxygen-containing method are proposed, the glove mounting part for fixing the glove to be detected is arranged, the detection cabin connected with the glove mounting part, the cavity and the vacuum pump, the nitrogen source, the differential pressure meter and the oxygen analyzer connected with the cavity, based on the specific detection steps, the air permeability of the glove can be accurately detected, and it is especially suitable for gloves of various materials and caliber sizes.

[0037] 2. The present application proposes a rigorous leakage rate test scheme, which considers the background leakage rate of the device and the internal gas volume change of the sealing structure after the glove is installed. By comparing with the relative test method of the standard glove, the interference of the internal volume change on the test result is avoided, and the accuracy of the leakage rate of the measured glove is further improved through the leakage rate correction value.

[0038] 3. The device of the present application has simple structure, small size, low background leakage rate, convenient operation, and can reflect the permeation characteristics of the glove material to the greatest extent, and is suitable for convenient use in many occasions.

[0039] 4. The present application provides a physical method based on controlling the air pressure change of the cavity, which can quickly reduce the oxygen concentration in the cabin. Through simple vacuum extraction and nitrogen injection, the oxygen concentration can be reduced to ppm level in a short time, which is fast and does not need to use the oxygen adsorption circulation system, reducing the maintenance cost.

[0040] 5、The present application uses a conventional vacuum pump to achieve effective oxygen concentration control, without the need to reach high vacuum degree, thus lower equipment investment and operating cost. The device is easy to operate, without the need for chemical reagent consumption and regeneration, and the daily maintenance is economical and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows, which form a part of the present application. The schematic embodiments of the present application and the description and explanation thereof do not constitute an improper limitation on the present application. In the drawings:

[0042] Figure 1 Fig. 1 is a schematic diagram of the working principle of a device for detecting glove leakage rate of a glove box by vacuum oxygen removal according to the present application;

[0043] Figure 2 Fig. 2 is a schematic diagram of the structure of a detection cabin according to the present application;

[0044] Figure 3 Fig. 3 is a schematic diagram of the structure of a sealing cover installed on the detection cabin according to the present application;

[0045] Figure 4 Fig. 4 is a schematic diagram of the structure of a standard glove or a glove to be detected installed on a glove mounting member according to the present application;

[0046] Figure 5 Fig. 5 is a schematic diagram of the standard glove or the glove to be detected in a detection state according to the present application;

[0047] Figure 6 Fig. 6 is a schematic diagram of the detection process of a device for detecting glove leakage rate of a glove box by vacuum oxygen removal according to the present application.

[0048] Explanation of the reference signs:

[0049] 1. detection cabin; 11. cavity; 12. glove mounting member; 121. flange part; 122. protruding part; 123. first connecting hole; 13. connecting hole assembly; 131. second connecting hole; 132. third connecting hole; 133. fourth connecting hole; 134. fifth connecting hole; 135. sixth connecting hole; 136. seventh connecting hole; 14. blocking member; 15. sealing cover; 16. support base; 2. vacuum pump; 21. first on-off valve; 22. second on-off valve; 3. nitrogen source; 31. third on-off valve; 4. thermometer; 5. differential pressure gauge; 6. oxygen analyzer. DETAILED DESCRIPTION

[0050] 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 connection 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.

[0051] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be magnetic connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be 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 to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] In order to solve the problems existing in the prior art, the embodiments of the present application provide a device for detecting glove leakage rate of glove box by vacuum deoxygenation, as shown in Figures 1-6 The device includes a detection cabin 1, and a vacuum pump 2, a nitrogen source 3, a thermometer 4, a differential pressure gauge 5 and an oxygen analyzer 6 connected with the detection cabin 1 respectively. The detection cabin 1 includes a cavity 11, and the outer surface of the cavity 11 is provided with a connecting hole assembly 13 including six connecting holes for connecting external equipment with the inside of the cavity 11. As shown in Figure 2As shown, the six connecting holes are respectively the second connecting hole 131, the third connecting hole 132, the fourth connecting hole 133, the fifth connecting hole 134, the sixth connecting hole 135 and the seventh connecting hole 136. The vacuum pump 2 and the nitrogen source 3 together form the oxygen removal system of the device. The vacuum pump 2 is connected to the cavity 11 through the third connecting hole 132, and is used to realize an efficient oxygen removal process by adjusting the air pressure inside the detection cabin 1, that is, to extract the air inside the cavity 11 to reduce the oxygen content in the cavity 11, thereby forming a low-oxygen environment, so as to accurately detect the glove leakage rate of the glove box. The second switch valve 22 is arranged on the connecting pipeline of the vacuum pump 2 and the third connecting hole 132, and is used to control the opening and closing of the pipeline. The nitrogen source 3 is connected to the cavity 11 through the fourth connecting hole 133, and is used to provide a low-oxygen environment inside the cavity 11 to assist the vacuum pump 2 to realize a more stable and accurate oxygen removal effect, that is, after the vacuum pump 2 is evacuated, the nitrogen source 3 replaces the residual oxygen by injecting nitrogen into the cavity 11, thereby further reducing the oxygen concentration. The third switch valve 31 is arranged on the connecting pipeline of the nitrogen source 3 and the fourth connecting hole 133, and is used to control the opening and closing of the above-mentioned pipeline. The thermometer 4 is connected to the cavity 11 through the fifth connecting hole 134, and is used to monitor the temperature inside the cavity 11 in real time, so as to ensure 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 to the cavity 11 through the sixth connecting 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 seventh connecting hole 136, and can accurately detect the trace oxygen level inside the cavity 11 in real time, thereby providing core data support for the leakage rate detection. The thermometer 4, the differential pressure gauge 5 and the oxygen analyzer 6 together form the data acquisition system of the device.

[0054] As shown in Figures 2-5 The detection cabin 1 further comprises a glove mounting member 12, a blocking member 14 and a sealing cover 15. As shown in Figure 2As shown, the glove mounting member 12 includes a flange portion 121, a protruding portion 122 and a first connecting hole 123. 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 outer portion thereof 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, such as 160mm, 180mm and 200mm. According to needs, other diameter sizes can also be provided. An O-ring is provided at the annular grooves, and when the gloves to be detected are mounted, the cuffs thereof are placed at the positions of the annular grooves and fixed through the O-ring, and at the same time, the O-ring can maximize the reduction of oxygen leakage at the glove mounting member 12, and a good sealing effect is achieved. The outer peripheral surface of the protruding portion 122 is further provided with the first connecting hole 123 for providing a communication channel between the external equipment and the internal space of the protruding portion 122. The vacuum pump 2 is connected with the internal space of the protruding portion 122 through the first connecting hole 123, and a first on-off valve 21 is provided on the connecting pipeline between the vacuum pump 2 and the second connecting hole 131 for controlling the opening and closing of the connecting pipeline. The internal portion of the protruding portion 122 is provided in a stepped structure, the internal portion of the protruding portion 122 corresponding to the annular grooves is a first step, the first connecting hole 123 is provided on the outer peripheral surface of the first step, and the internal portion 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 that of the second step, and an internal thread is provided on the inner side of the second step.

[0055] As shown in Figure 2 , the detection cabin 1 is further provided with a blocking member 14 located at the communication position between the protruding portion 122 and the cavity 11, and the blocking member 14 is provided in a circular shape, and the outer periphery thereof is in contact with the inner side 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 inner side of the second step. A handle is further provided on the blocking member 14, and through the handle, the blocking member 14 can be screwed with the inner side of the protruding portion 122 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 between the gloves and the cavity 11, and plays a blocking and sealing role. When the blocking member 14 is screwed through the handle, the space formed by the gloves and the protruding portion 122 is communicated with the cavity 11.

[0056] As shown in Figure 4As shown, the detection cabin 1 is also provided with a sealing cover 15 at the other end of the cavity 11, which is fixedly connected with the other end of the cavity 11 and used for closing the cavity 11 to ensure the airtightness of the internal environment of the cavity 11, so as to maintain the specific conditions such as low oxygen and low pressure in the glove leak rate detection process and avoid the interference of 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 arranged to be easily disassembled or replaced, facilitating maintenance and prolonging the service life of the detection device.

[0057] The above structural design can accurately detect the leak rate of the glove box gloves by creating a low-oxygen environment and detecting related data in real time.

[0058] The detection cabin 1 is connected with the vacuum pump 2 and the nitrogen source 3, and cooperates to quickly reduce the oxygen concentration through vacuum pumping. The vacuum pump 2 reduces the oxygen content in the cavity 11 through air pumping, and the nitrogen source 3 injects nitrogen into the cavity 11 after the vacuum pump 2 works to further displace oxygen and maintain a 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) of the gas in the cabin, so as to realize rapid oxygen removal.

[0059] When operating, the volume inside the cavity 11 is fixed after the blocking piece 14 is installed. According to the Clapeyron equation:

[0060] PV=nRT

[0061] Where P is the pressure in the cavity 11, V is the volume in the cavity 11, n is the amount of substance of air in the cavity 11, and R is the molar gas constant. At a constant temperature, the temperature fluctuation and the volume change are ignored, V, R and T are constants, and then P∝n.

[0062] In terms of data monitoring, the gloves to be detected are first connected with the cavity 11 through the glove mounting piece 12. The design of the blocking piece 14 and the sealing cover 15 enhances the airtightness of the cavity 11 and avoids the interference of the external environment on the detection result. The cavity 11 is connected with the thermometer 4, the pressure difference meter 5 and the oxygen analyzer 6. During the glove leak rate detection process, relevant data are detected and collected to provide accurate data support for the detection of the glove leak rate.

[0063] In order to ensure the consistency of the detection conditions, especially the consistency of the internal volume formed by the glove to be detected and the cavity 11 during detection, first, the blocking piece 14 is fixed between the glove mounting piece 12 and the cavity 11. Using the standard glove and the above-mentioned detection device structure, the first oxygen concentration change value after installing the standard glove is detected, 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, i.e. the third leakage rate. Second, remove the blocking piece 14 and detect the second oxygen concentration change value of the standard glove. Third, remove the standard glove and install the glove to be detected. Then, the third oxygen concentration change value before and after removing the blocking piece 14 is detected by the above-mentioned detection device. Through the second oxygen concentration change value, the third oxygen concentration change value, and the first leakage rate (i.e. the background leakage rate) and the corrected leakage rate (the third leakage rate) values, the required leakage rate result of the glove to be detected is calculated according to the formula.

[0064] In some preferred embodiments, the above-mentioned standard glove is made of high barrier material such as butyl rubber.

[0065] In some preferred embodiments, in order to further control the size of the detection space, reduce the gas volume of the environment during glove detection, reduce the potential oxygen leakage of the material of the detection device itself, and improve the detection accuracy, the cavity 11 is designed in the shape of a cylindrical barrel. Preferably, in order to meet the detection needs of various glove box gloves, the diameter of the cavity 11 is designed to be 200-300 mm, which is larger than the sleeve size of various existing glove box gloves; the axial length of the cavity 11 is designed to be 850-950 mm, which is larger than the length of various existing glove box gloves.

[0066] In some preferred embodiments, the thermometer 4 adopts a thermocouple structure to measure the temperature of the gas inside the cavity 11 during detection.

[0067] In some preferred embodiments, the differential pressure gauge 5 adopts a micro differential pressure sensor to measure the relative pressure difference of the gas inside the cavity 11 during detection.

[0068] In some preferred embodiments, the sealing cover 15 is connected to the cavity 11 through a sealing clamp.

[0069] In some preferred embodiments, the detection cabin 1 further comprises a plurality of support bases 16 for providing a solid foundation for the entire device, ensuring that the equipment remains balanced during operation, and avoiding tilting or displacement caused by external forces or internal pressure changes. Preferably, the number of support bases 16 is 2-4.

[0070] The present application also provides a detection method for detecting the leakage rate of glove box gloves, comprising the following steps:

[0071] S1: seal the glove mounting piece 12, the blocking piece 14 and the sealing cover 15 with the cavity 11, the first to-be-tested space is formed between the glove, the glove mounting piece 12 and the blocking piece 14, and the second to-be-tested space is formed between the blocking piece 14, the cavity 11 and the sealing cover 15; the vacuum pump 2, the nitrogen source 3, the thermometer 4, the pressure difference meter 5 and the oxygen analyzer 6 are connected with the cavity 11 through the third connecting hole 132, the fourth connecting hole 133, the fifth connecting hole 134, the sixth connecting hole 135 and the seventh connecting hole 136 respectively.

[0072] S2: detect the first oxygen concentration value 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 (the first leakage rate) and the corrected leakage rate (the third leakage rate) based on the first oxygen concentration change value.

[0073] S21: install the standard glove, so that the standard glove is rolled up and placed in the ring groove closest to the flange 121, and the other two ring grooves are fixed by using the O-shaped sealing ring, so that the standard glove is in a sealed state with the glove mounting piece 12.

[0074] S22: open the first switch valve 21, and the vacuum pump 2 extracts the air in the first to-be-tested space formed by the standard glove and the glove mounting piece 12 and the blocking piece 14 through the first connecting hole 123.

[0075] S23: close the first switch valve 21, open the second switch valve 22, and the vacuum pump 2 extracts the air in the cavity 11, i.e. the air in the second to-be-tested space, through the third connecting hole 132; the gas pressure in the cavity 11 is monitored by using the pressure difference meter 5, and when the gas pressure in the cavity 11 is reduced to ≤-90kPa to -99kPa, the second switch valve 22 is closed.

[0076] S24: open the third switch valve 31, and the nitrogen source 3 injects high-purity nitrogen into the cavity 11 through the fourth connecting hole 133, and when the pressure in the cavity 11 recovers to normal pressure, the third switch valve 31 is closed.

[0077] S25: repeat S22-S24 for 2-4 times, and observe the oxygen concentration value in the cavity 11 by using the oxygen analyzer 6, when the oxygen concentration value is reduced to ≤50ppm, the relative pressure in the cavity 11 is adjusted to the detection condition, i.e. (-1100 to -900) Pa, by using the vacuum pump 2 and the pressure difference meter 5; preferably, the oxygen concentration value is reduced to ≤10ppm.

[0078] S26: After the above detection condition is stable, the first oxygen concentration is recorded by the oxygen analyzer 6, and the timer (not shown in the figure) is timed. After a certain time, the second oxygen concentration is recorded by the oxygen analyzer 6. The first oxygen concentration change value is obtained by the first oxygen concentration and the second oxygen concentration value. The background leakage rate (first leakage rate) of the cavity 11 is calculated based on the above first oxygen concentration change value. Preferably, the certain time is 30-60 minutes.

[0079] S27: The above background leakage rate (first leakage rate) is used to estimate the corrected leakage rate (third leakage rate) in combination with the self-volume of the cavity 11 and the expanded volume of the standard glove.

[0080] 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 detected, based on the above second oxygen concentration change value, third oxygen concentration change value and the above corrected leakage rate (third leakage rate) to calculate the leakage rate of the glove to be detected.

[0081] S31: As shown in Figure 5 , the blocking piece 14 is unscrewed and pushed into the cavity 11 to make the first test space and the second test space communicate. The relative pressure inside the cavity 11 is adjusted to the detection condition, i.e. (-1100-900) Pa, by the vacuum pump 2 and the differential pressure gauge 5. Due to the negative pressure, the standard glove will automatically expand inside the cavity 11, as shown in Figure 6 .

[0082] S32: After the above detection condition is stable, the third oxygen concentration is recorded by the oxygen analyzer 6, and the timer (not shown in the figure) is timed. After a certain time, the fourth oxygen concentration is recorded by the oxygen analyzer 6. The difference between the third oxygen concentration and the fourth oxygen concentration is taken as the second oxygen concentration change value under the standard glove. Preferably, the certain time is 30-60 minutes.

[0083] S33: Through the standard glove, the blocking piece 14 is screwed to the inside of the protruding part 122 of the glove mounting part 12, and the hollow circular opening structure of the glove mounting part 12 is blocked, which plays a sealing role. At this time, the standard glove is removed and the glove to be detected is installed.

[0084] S34: For the glove to be detected, repeat S22-S24 1-2 times. The oxygen concentration value inside the cavity 11 is observed by the oxygen analyzer 6. When the oxygen concentration value is reduced to ≤50ppm, as shown in Figure 5 , the blocking piece 14 is pushed into the cavity 11, and the relative pressure inside the cavity 11 is adjusted to the detection condition, i.e. (-1100-900) Pa, by the vacuum pump 2 and the differential pressure gauge 5; preferably, the oxygen concentration value is reduced to ≤10ppm. As shown in Figure 6As shown, due to the negative pressure, the glove to be detected will automatically expand inside the cavity 11.

[0085] S35: 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 time, after a certain 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 taken as the third oxygen concentration change value under the standard glove. Preferably, the certain time is 30 min to 60 min.

[0086] S36: Calculate the hourly leakage rate of the glove to be detected by using the following formula:

[0087]

[0088] In the formula:

[0089] ΔO2 - the third oxygen concentration change value using the glove to be measured, expressed in volume parts per million (ppm);

[0090] ΔO1 - the second oxygen concentration change value using the standard glove, expressed in volume parts per million (ppm);

[0091] t - test duration, min;

[0092] T0 - consider the device to correct the leakage rate (third leakage rate).

[0093] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative, not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, all of which belong to the protection of the present application.

Claims

1. A device for detecting the leakage rate of gloves in a glove box using vacuum deoxygenation, 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 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, and the sealing ring clamp fixes the glove to be tested on the annular groove, and the glove to be tested, the protrusion and the cavity together form a space to be tested; a circular blocking piece is provided at the connection between the protrusion and the cavity, the inner side of the protrusion is provided with an internal thread, and the outer periphery of the blocking piece is provided with an external thread, and the internal and external threads cooperate to enable the blocking piece to be fastened to the inner side of the protrusion to block the communication between the protrusion and the cavity; the blocking piece divides the space to be tested into a first space to be tested and a second space to be tested, the first space to be tested is formed between the glove to be tested, the protrusion and the blocking piece, and the second space to be tested is formed between the blocking piece and the cavity; A deoxygenation system, comprising a vacuum pump and a nitrogen source, both of which are disposed outside the cavity and connected to the outer surface of the cavity through the connecting hole assembly; the vacuum pump and the nitrogen source work in conjunction to reduce the oxygen content in the space to be inspected by vacuuming and injecting nitrogen, thereby providing a hypoxic environment; A data acquisition system, the data acquisition system includes a differential pressure gauge and an oxygen analyzer, both of which are arranged outside the cavity and are connected to the outer surface of the cavity through the connecting hole assembly; the differential pressure gauge and the oxygen analyzer are used to detect the pressure difference and oxygen content of the space to be detected and output corresponding detection data.

2. The device according to claim 1, 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.

3. The device according to claim 2, characterized in that The first step is arranged away from the cavity, and the outer peripheral surface of the first step is provided with at least one annular groove.

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

5. The device according to claim 4, characterized in that The diameters of the plurality of annular grooves are different so as to adapt to the different cuff sizes of the gloves to be tested.

6. The device according to claim 2, characterized in that A first connecting hole is provided on the outer peripheral surface of the first step, and the vacuum pump is connected to the first space to be detected through the first connecting hole.

7. The device according to any one of claims 1 to 6, characterized in that: The glove mounting piece is further provided with a flange portion connected to the protruding portion. The flange portion is a circular flange structure, which is in direct contact with the end surface of the cavity and is used for fastening connection with the cavity.

8. The device according to any one of claims 1 to 6, characterized in that: The detection chamber is further provided with a sealing cover, which is fastened to the other end of the cavity and is used to seal the cavity.

9. The device according to any one of claims 1 to 6, characterized in that: The data acquisition system further includes a thermometer, which is connected to the cavity through the connecting hole assembly and is used to detect the temperature of the gas inside the cavity.

10. A method for detecting leakage rate using the device according to any one of claims 1 to 9, characterized in that: include: Sealingly connecting the glove mounting member, the blocking member, and the sealing cover to the cavity to form the first to-be-detected space and the second to-be-detected space; Connecting the vacuum pump, the nitrogen source, the differential pressure gauge, and the oxygen analyzer to the cavity through the connecting hole assembly; Mounting a standard glove on the glove mounting member, reducing the internal oxygen content of the first and second spaces to be inspected by controlling the vacuum pump and the nitrogen source, 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 the background leakage 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 in the cavity is reduced by controlling the vacuum pump and the nitrogen source. 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 in the cavity is reduced by controlling the vacuum pump and the nitrogen source. 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.

11. The detection method according to claim 10, characterized in that: The vacuum pump and the nitrogen source reduce the oxygen content inside the cavity, including: Two connecting pipes are respectively provided between the vacuum pump and the cavity, and between the vacuum pump and the protruding portion. A first switch valve and a second switch valve are respectively provided on the two connecting pipes. The first switch valve is opened and the second switch valve is kept closed to extract the internal air of the first space to be detected; closing the first on-off valve, opening the second on-off valve, and extracting the internal air of the second space to be detected; A third switch valve is provided on the connecting pipeline between the nitrogen source and the cavity, and the second switch valve is closed and the third switch valve is opened to inject high-purity nitrogen into the cavity; Repeat the above process and use the oxygen analyzer to observe the oxygen concentration value inside the cavity until it drops to the required oxygen content detection condition.

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