Air-saving glove box and air-saving method

Abstract

The present invention discloses an air-saving glove box and an air-saving method, comprising a glove box body and a transition chamber, a gas purifier or a purified gas storage device and a gas circulation recovery device, which are connected to the glove box body and / or the transition chamber for gas recovery and recycling. When the transition chamber is used to transfer materials, external air will be mixed into the transition chamber, causing the gas atmosphere in the transition chamber to not meet the experimental requirements inside the glove box body. Therefore, repeated cleaning must be performed until the gas atmosphere in the transition chamber meets the requirements before the first sealed cabin door can be opened. The purified gas used for cleaning is directly discharged. Therefore, the cost of use is high. The present invention creatively recovers the high-concentration, low-impurity gas after cleaning. When cleaning the transition chamber, the first few cleanings are performed using the high-concentration, low-impurity recovered gas, and then the purified gas is used for the final cleaning. This reduces the consumption of purified gas and achieves cost reduction and efficiency improvement.

Description

Technical Field

[0001] The present invention relates to the field of glove boxes requiring purified gas, and in particular to an air-saving glove box and an air-saving method. Background Art

[0002] Glove boxes are widely used in high-tech research and manufacturing processes, including medicine, biology, chemistry, nuclear energy, lithium batteries, and machining. They can provide an operating environment for various scientific research and production processes, containing gases of varying purity or removing specific impurities.

[0003] At present, the more frequently the glove box is operated, the more gas it consumes. Gas is consumed every time items are put in or out of the transition chamber. Scientific research requires a large number of experimental operations every day, which consumes a large amount of gas, resulting in increased costs and is not conducive to sustainable operations in the research and production fields. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an air-saving glove box and an air-saving method, which overcome the problem of increased costs caused by gas waste in the prior art.

[0005] Specifically, the present invention discloses an air-saving glove box, which includes a glove box body and a transition cabin, wherein one end of the transition cabin is connected to the glove box body, and a first sealed cabin door that can be opened and closed is provided between the transition cabin and the glove box body, and a second sealed cabin door that can be opened and closed is provided at the other end of the transition cabin;

[0006] A gas purifier or purified gas storage device is connected to the glove box body and the transition chamber respectively, and is used to deliver purified gas into the glove box body and clean the gas atmosphere in the purification transition chamber;

[0007] The gas recycling and recovery device is connected to the glove box body and / or the transition cabin and is used for gas recovery and recycling.

[0008] When transferring items into or out of the glove box using the transition chamber, the first sealed door must be closed, followed by the second sealed door. This allows outside air to enter the transition chamber, causing the atmosphere inside the transition chamber to not meet the experimental requirements within the glove box. Therefore, after placing or removing items from the transition chamber, the transition chamber must be repeatedly cleaned with purified gas (the same purified gas used in the glove box) and repeatedly evacuated until the atmosphere (including gas composition ratio and dryness) meets the requirements. Only then can the first sealed door be opened for further operations. Because the purified gas used for cleaning contains impurities from outside air and does not meet experimental requirements, conventional techniques have typically either discharged directly (harmless gas) or discharged into a gas harmless treatment device (harmless gas). Consequently, the use of purified gas remains high, leading to increased costs. The present invention creatively utilizes a gas circulation recovery device to recycle the high-concentration, low-impurity gas after cleaning. When the transition chamber needs to be cleaned next time, the first few cleanings will no longer use purified gas, but high-concentration, low-impurity recovered gas will be used for cleaning. After the impurities in the transition chamber are further reduced, purified gas will be used for the final cleaning (these gases are all recovered and wait for the next use). In this way, the consumption of purified gas can be greatly reduced, thereby achieving the purpose of reducing costs and increasing efficiency.

[0009] Furthermore, a first one-way valve is provided between the gas circulation recovery device and the glove box body to limit the gas to flow from the glove box body to the gas circulation recovery device. Two pipelines are provided between the gas circulation recovery device and the transition cabin, and a fifth one-way valve and a sixth one-way valve are provided on the two pipelines respectively. The fifth one-way valve limits the gas to flow from the gas circulation recovery device to the transition cabin in one direction, and the sixth one-way valve limits the gas to flow from the transition cabin to the gas circulation recovery device in one direction.

[0010] Furthermore, the air-saving glove box is provided with a control device, and the gas circulation and recovery device includes a gas storage tank, a delivery pump and a vacuum pump; the first one-way valve is arranged between the gas storage tank and the glove box body, and an air pressure sensor is arranged in the glove box body, and the air pressure sensor is connected to the control device signal. The control device controls the gas purifier or the purified gas storage device to inject purified gas into the glove box body according to the signal of the air pressure sensor, or opens the first one-way valve to draw the overpressure gas in the glove box body into the gas storage tank through the delivery pump; the air outlet of the delivery pump is connected to the gas storage tank, and the air inlet is connected to the first one-way valve and the sixth one-way valve respectively through a three-way valve; the vacuum pump is connected to the transition cabin, and a fourth one-way valve is arranged between the vacuum pump and the transition cabin.

[0011] Furthermore, a second one-way valve and a third one-way valve are respectively provided between the gas purifier or purified gas storage device and the glove box body and the transition cabin, limiting the gas to flow in one direction from the gas purifier or purified gas storage device to the glove box body or the transition cabin.

[0012] Furthermore, a seventh one-way valve is provided between the gas storage tank and the glove box body to limit the gas to flow in one direction only from the gas storage tank to the glove box body.

[0013] Furthermore, the gas outlet of the vacuum pump is connected to the gas inlet of the gas purifier.

[0014] Furthermore, a filtering device is provided between the gas outlet of the vacuum pump and the gas inlet of the gas purifier.

[0015] Furthermore, the gas purifier or purified gas storage device includes a purified gas preparation device and a purified gas storage tank.

[0016] Furthermore, the purified gas preparation device and the purified gas storage tank are both connected to the glove box body, and are each provided with a second one-way valve.

[0017] Furthermore, a second delivery pump is provided between the purified gas preparation device and the purified gas storage tank, and the second delivery pump pressurizes and delivers the purified gas produced by the purified gas preparation device into the purified gas storage tank.

[0018] The present invention also provides a glove box air-saving method, comprising the following steps:

[0019] S1, the first sealed hatch is closed, the second sealed hatch is opened, the objects to be placed in the glove box body are placed in the transition hatch, and the second sealed hatch is closed;

[0020] S2, start the vacuum pump to extract the gas in the transition cabin;

[0021] S3, if there is no stored gas in the gas storage tank, open the third one-way valve, and inject purified gas into the transition chamber from the gas purifier or the purified gas storage device, and then proceed to step S4; alternatively, start the vacuum pump to pump out the gas in the transition chamber; repeat this process several times, and then proceed to step S4; if there is stored gas in the gas storage tank, open the fifth one-way valve, and inject purified gas into the transition chamber from the gas recycling device, and then proceed to step S4; alternatively, start the vacuum pump to pump out the gas in the transition chamber; repeat this process several times, and then proceed to step S4;

[0022] S4, open the third one-way valve, and inject purified gas from the gas purifier or purified gas storage device into the transition chamber. Then, open the delivery pump and the sixth one-way valve to pump the gas in the transition chamber into the gas storage tank of the gas recycling device. Repeat this process several times until the gas atmosphere in the transition chamber meets the requirements. Then, open the first sealed hatch, move the object into the glove box body, and close the first sealed hatch.

[0023] S5. When the gas pressure in the glove box body is too low, the second one-way valve is opened, and the gas purifier or the purified gas storage device replenishes the purified gas into the glove box body. When the gas pressure in the glove box body is too high, the first one-way valve is opened to move the excess gas in the glove box body into the gas storage tank of the gas circulation recovery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0025] Figure 1 and Figure 2 Schematic diagrams of the structures of two different examples of an air-saving glove box according to the present invention.

[0026] Glove box body 1, gloves 11, transition cabin 2, first sealed hatch 12, second sealed hatch 21, fourth one-way valve 23, gas purifier or purified gas storage device 3, second one-way valve 31, second delivery pump 32, third one-way valve 33, purified gas storage tank 34, purified gas preparation device 35, gas recycling and recovery device 4, first one-way valve 41, delivery pump 42, fifth one-way valve 48, sixth one-way valve 43, seventh one-way valve 47, gas storage tank 44, vacuum pump 45, filter device 46. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, a gas-saving glove box is provided with gloves 11 for operation. The glove box comprises a glove box body 1 and a transition chamber 2. One end of the transition chamber 2 is connected to the glove box body 1, and a first sealed door 12 that can be opened and closed is provided between the transition chamber 2 and the glove box body 1. The other end of the transition chamber 2 is provided with a second sealed door 21 that can be opened and closed.

[0029] A gas purifier or purified gas storage device 3 is connected to the glove box body 1 and the transition chamber 2, respectively, for delivering purified gas into the glove box body 1 and cleaning the gas atmosphere in the purifying transition chamber 2;

[0030] The gas recycling and recovery device 4 is connected to the glove box body 1 and / or the transition cabin 2 and is used for gas recovery and recycling.

[0031] When transferring items into or out of the glove box using the transition chamber, the first sealed door must be closed, followed by the second sealed door. This allows outside air to enter the transition chamber, causing the atmosphere inside the transition chamber to not meet the experimental requirements within the glove box. Therefore, after placing or removing items from the transition chamber, the transition chamber must be repeatedly cleaned with purified gas (the same purified gas used in the glove box) and repeatedly evacuated until the atmosphere (including gas composition ratio and dryness) meets the requirements. Only then can the first sealed door be opened for further operations. Because the purified gas used for cleaning contains impurities from outside air and does not meet experimental requirements, conventional techniques have typically either discharged directly (harmless gas) or discharged into a gas harmless treatment device (harmless gas). Consequently, the use of purified gas remains high, leading to increased costs. The present invention creatively utilizes a gas circulation recovery device to recycle the high-concentration, low-impurity gas after cleaning. When the transition chamber needs to be cleaned next time, the first few cleanings will no longer use purified gas, but high-concentration, low-impurity recovered gas will be used for cleaning. After the impurities in the transition chamber are further reduced, purified gas will be used for the final cleaning (these gases are all recovered and wait for the next use). In this way, the consumption of purified gas can be greatly reduced, thereby achieving the purpose of reducing costs and increasing efficiency.

[0032] In some embodiments, a first one-way valve 41 is provided between the gas circulation recovery device 4 and the glove box body 1 to limit the gas to flow from the glove box body 1 to the gas circulation recovery device 4. When the gas pressure in the glove box body 1 is higher than the set value, the overpressure gas in the glove box body 1 is introduced into the gas circulation recovery device 4 to ensure that the gas pressure in the glove box body 1 is stable.

[0033] like Figure 1 As shown, in actual application, two pipelines are provided between the gas circulation recovery device 4 and the transition cabin 2, and the two pipelines are respectively provided with a fifth one-way valve 48 and a sixth one-way valve 43. The fifth one-way valve 48 limits the gas to flow only from the gas circulation recovery device 4 to the transition cabin 2 in one direction, and the sixth one-way valve 43 limits the gas to flow only from the transition cabin 2 to the gas circulation recovery device 4 in one direction.

[0034] Specifically, the air-saving glove box is provided with a control device (not shown in the figure), and the gas circulation and recovery device includes a gas storage tank 44, a delivery pump 42 and a vacuum pump 45; the first one-way valve 4 is provided between the gas storage tank 44 and the glove box body 1, and an air pressure sensor is provided in the glove box body 1. The air pressure sensor is connected to the control device by signal. The control device controls the gas purifier or the purified gas storage device 3 to inject purified gas into the glove box body 1 according to the signal of the air pressure sensor, or opens the first one-way valve 41 to draw the overpressure gas in the glove box body 1 into the gas storage tank 44 through the delivery pump 42; the air outlet of the delivery pump 42 is connected to the gas storage tank 44, and the air inlet is connected to the first one-way valve 41 and the sixth one-way valve 43 respectively through a three-way connection; the vacuum pump 45 is connected to the transition cabin 2, and a fourth one-way valve 23 is provided between the vacuum pump 45 and the transition cabin 2. After the air in the transition cabin 2 is evacuated, high-concentration gas is injected into the transition cabin 2 through the fifth one-way valve 48 to dilute and clean the impurities, and then the gas in the transition cabin 2 is evacuated again through the vacuum pump 45. At this time, if the concentration and humidity of the mixed gas do not meet the requirements for recycling, it can be discharged or introduced into a gas filtration and purification device for filtration and purification. After repeated dilution, cleaning and vacuuming, if the concentration and humidity of the mixed gas meet the requirements for recycling, the high-concentration gas in the transition cabin 2 is recovered into the gas storage tank 44 through the delivery pump 42 and the sixth one-way valve 43 for reuse.

[0035] In this way, the high-purity, low-impurity gas recovered and stored in the gas circulation recovery device 4 can be used for cleaning the transition chamber, and the high-concentration, low-impurity gas that meets the requirements in the transition chamber can also be recycled into the gas circulation recovery device 4 for the next cycle.

[0036] In some application scenarios, the air pressure in the glove box is required to be constant or have a very low rate of change. However, during use, for example, the operator's arm moving in and out, and the placement or removal of objects in the glove box body, will cause fluctuations in air pressure. In the prior art, when the air pressure is too high, the excess gas will be discharged through the pressure relief valve. These discharged purified gases cannot be recycled into the glove box body for continued use because they are at risk of being contaminated. At the same time, since the gas in the glove box body will also produce experimental impurities during the experiment, it is not allowed to be recycled into the gas purifier or purified gas storage device 3. Since there is no gas recycling and recovery device 4 in the prior art, all of this gas is wasted. These discharged gases are indeed fully qualified for the initial cleaning of the transition chamber 2, so they are stored in the gas recycling and recovery device 4 and can be reused to achieve the purpose of further saving gas and reducing costs.

[0037] In some embodiments, a second one-way valve 31 and a third one-way valve 33 are respectively installed between the gas purifier or purified gas storage device 3 and the glove box body 1 and transition chamber 2, restricting gas flow from the gas purifier or purified gas storage device 3 to a one-way direction toward the glove box body 1 or transition chamber 2. This effectively prevents the risk of contamination of the purified gas source caused by reverse gas flow.

[0038] like Figure 2 As shown, in some embodiments, the outlet of the vacuum pump 45 is connected to the inlet of a gas purifier. For locations with an on-site gas purifier (purified gas production equipment), the contaminated purified gas in the transition chamber 2 can be utilized as a production gas source. Due to its inherently high concentration, this can reduce the production cost of purified gas. Gas in the transition chamber 2 that meets the recovery requirements of the gas recycling and recovery unit 4 is recycled into the gas recycling and recovery unit 4. When the gas no longer meets the purity requirements of the gas recycling and recovery unit 4, it is transferred to the gas purifier for further purification and processing to produce purified gas.

[0039] In some embodiments, a filter device 46 is provided between the air outlet of the vacuum pump 45 and the air inlet of the gas purifier. The filter device 46 can pre-remove particulate impurities, moisture and other impurities in the recovered gas. In fact, a second filter device can also be provided between the gas circulation recovery device 4 and the transition chamber 2 to pre-remove particulate impurities, moisture and other impurities in the recovered gas, thereby further improving the effect of pre-cleaning the transition chamber with the recovered gas.

[0040] In some embodiments, the gas purifier or purified gas storage device 3 includes a purified gas preparation device 35 and a purified gas storage tank 34. Generally speaking, laboratories purchase purified gas storage tanks 34 for use. When the gas pressure drops to a set value, a new purified gas storage tank 34 needs to be replaced. However, some production plants have the conditions to install a purified gas preparation device 35 and produce purified gas in-house to reduce costs. However, purified gas storage tanks 34 are still required to store the purified gas and maintain its gas pressure above the set value to meet the needs of continuous use.

[0041] In some embodiments, the purified gas preparation device 35 and the purified gas storage tank 34 are both connected to the glove box body 1 and are each equipped with a second one-way valve 31. This allows both the purified gas preparation device 35 and the purified gas storage tank 34 to directly supply gas to the glove box body 1. This prevents the glove box from being forced to suspend operation even if either device 35 or the purified gas storage tank 34 malfunctions.

[0042] In some embodiments, a second delivery pump 32 is provided between the purified gas preparation device 35 and the purified gas storage tank 34. The second delivery pump 32 pressurizes and delivers the purified gas produced by the purified gas preparation device 35 into the purified gas storage tank 34. In this way, when the purified gas in the purified gas storage tank 34 is insufficient, the purified gas preparation device 35 can be activated to prepare purified gas for timely replenishment. Alternatively, the purified gas preparation device 35 can directly provide a gas source at ordinary times, and the purified gas in the purified gas storage tank 34 can serve as the purified gas source when the purified gas preparation device 35 is shut down, thereby preventing the glove box from becoming inoperable.

[0043] In some applications, where the atmosphere in the glove box body 1 is less stringent, the recycled gas in the gas tank 44 can also meet the requirements of the glove box body 1. A seventh one-way valve 47 can be installed between the gas tank 44 and the glove box body 1 to restrict gas flow from the gas tank 44 to the glove box body 1. When the glove box body 1 needs to be replenished with gas, the recycled gas in the gas tank 44 is used to further reduce other purification costs.

[0044] The present invention also provides a glove box air-saving method, comprising the following steps:

[0045] S1, the first sealed hatch 12 is closed, the second sealed hatch 21 is opened, the objects to be put into the glove box body 1 are placed into the transition cabin 2, and the second sealed hatch 21 is closed;

[0046] S2, start the vacuum pump to extract the gas in the transition cabin 2;

[0047] In step S3, if there is no gas stored in the gas storage tank 44, the third one-way valve 33 is opened, and the gas purifier or the purified gas storage device 3 injects purified gas into the transition chamber, and then the process proceeds to step S4; alternatively, the vacuum pump is activated to extract the gas in the transition chamber 2; this process is repeated several times, and then the process proceeds to step S4; if there is gas stored in the gas storage tank 44, the fifth one-way valve 48 is opened, and the gas recycling device 4 injects purified gas into the transition chamber, and then the process proceeds to step S4; alternatively, the vacuum pump is activated to extract the gas in the transition chamber 2; this process is repeated several times, and then the process proceeds to step S4;

[0048] S4: Open the third one-way valve 33, and inject purified gas from the gas purifier or purified gas storage device 3 into the transition chamber 2. Then, open the delivery pump 42 and the sixth one-way valve 43 to pump the gas in the transition chamber 2 into the gas storage tank 44 of the gas recycling device 4. Repeat this process several times until the gas atmosphere in the transition chamber 2 meets the requirements. Then, open the first sealed door 12, move the object into the glove box body 1, and close the first sealed door 12.

[0049] S5. When the gas pressure in the glove box body 1 is too low, the second one-way valve 31 is opened, and the gas purifier or the purified gas storage device 3 replenishes the purified gas into the glove box body 1. When the gas pressure in the glove box body 1 is too high, the first one-way valve 41 is opened, and the excess gas in the glove box body 1 is moved into the gas storage tank 44 of the gas recycling device 4.

[0050] It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An air-saving glove box, characterized in that: The glove box comprises a glove box body (1) and a transition chamber (2), one end of the transition chamber (2) is connected to the glove box body (1), and a first sealable door (12) that can be opened and closed is provided between the transition chamber (2) and the glove box body (1), and the other end of the transition chamber (2) is provided with a second sealable door (21) that can be opened and closed; A gas purifier or purified gas storage device (3) is connected to the glove box body (1) and the transition chamber (2) respectively, and is used to deliver purified gas into the glove box body (1) and clean the gas atmosphere in the purified transition chamber (2); A gas recycling device (4) is connected to the glove box body (1) and / or the transition chamber (2) and is used for gas recovery and recycling; A first one-way valve (41) is provided between the gas circulation recovery device (4) and the glove box body (1), limiting the gas to flow only from the glove box body (1) to the gas circulation recovery device (4). Two pipelines are provided between the gas circulation recovery device (4) and the transition cabin (2). The two pipelines are respectively provided with a fifth one-way valve (48) and a sixth one-way valve (43). The fifth one-way valve (48) limits the gas to flow only from the gas circulation recovery device (4) to the transition cabin (2). The sixth one-way valve (43) limits the gas to flow only from the transition cabin (2) to the gas circulation recovery device (4). The gas circulation recovery device recycles the high-concentration, low-impurity gas after cleaning. When the transition chamber needs to be cleaned next time, the first few cleanings will no longer use purified gas, but high-concentration, low-impurity recovered gas will be used for cleaning. After the impurities in the transition chamber are further reduced, purified gas will be used for the final cleaning.

2. The air-saving glove box according to claim 1, characterized in that: The air-saving glove box is provided with a control device, and the gas circulation recovery device includes a gas storage tank (44), a delivery pump (42) and a vacuum pump (45); the first one-way valve (41) is provided between the gas storage tank (44) and the glove box body (1), and an air pressure sensor is provided in the glove box body (1), and the air pressure sensor is connected to the control device signal. The control device controls the gas purifier or the purified gas storage device (3) to inject purified gas into the glove box body (1) according to the signal of the air pressure sensor, or opens the first one-way valve (41) to pump the overpressure gas in the glove box body (1) into the gas storage tank (44) through the delivery pump (42); the gas outlet of the delivery pump (42) is connected to the gas storage tank (44), and the gas inlet is connected to the first one-way valve (41) and the sixth one-way valve (43) respectively through a three-way connection; the vacuum pump (45) is connected to the transition cabin (2), and a fourth one-way valve (23) is provided between the vacuum pump (45) and the transition cabin (2).

3. The air-saving glove box according to claim 2, characterized in that: A second one-way valve (31) and a third one-way valve (33) are respectively provided between the gas purifier or the purified gas storage device (3) and the glove box body (1) and the transition chamber (2), restricting the gas to flow in one direction only from the gas purifier or the purified gas storage device (3) to the glove box body (1) or the transition chamber (2).

4. The air-saving glove box according to claim 3, characterized in that: The gas outlet of the vacuum pump (45) is connected to the gas inlet of the gas purifier.

5. The air-saving glove box according to claim 4, characterized in that: A filtering device (46) is provided between the gas outlet of the vacuum pump (45) and the gas inlet of the gas purifier.

6. The air-saving glove box according to claim 2, characterized in that: A seventh one-way valve (47) is provided between the gas storage tank (44) and the glove box body (1), limiting the gas to flow in one direction only from the gas storage tank (44) to the glove box body (1).

7. The air-saving glove box according to claim 5, characterized in that: The gas purifier or purified gas storage device (3) comprises a purified gas preparation device (35) and a purified gas storage tank (34). Both the purified gas preparation device (35) and the purified gas storage tank (34) are connected to the glove box body (1) and are respectively provided with a second one-way valve (31).

8. The air-saving glove box according to claim 7, characterized in that: A second delivery pump (32) is provided between the purified gas preparation device (35) and the purified gas storage tank (34), and the second delivery pump (32) pressurizes and delivers the purified gas produced by the purified gas preparation device (35) into the purified gas storage tank (34).

9. A glove box air-saving method for the air-saving glove box according to claim 8, characterized in that: The following steps are involved: S1, the first sealed hatch (12) is closed, the second sealed hatch (21) is opened, the objects to be placed in the glove box body (1) are placed in the transition cabin (2), and the second sealed hatch (21) is closed; S2, start the vacuum pump to extract the gas in the transition chamber (2); S3, if there is no stored gas in the gas storage tank (44), open the third one-way valve (33), and inject purified gas into the transition chamber from the gas purifier or the purified gas storage device (3), and then proceed to step S4; or, start the vacuum pump to extract the gas in the transition chamber (2); after repeating this several times, proceed to step S4; if there is stored gas in the gas storage tank (44), open the fifth one-way valve (48), and inject purified gas into the transition chamber from the gas circulation recovery device (4), and then proceed to step S4; or, start the vacuum pump to extract the gas in the transition chamber (2); after repeating this several times, proceed to step S4; S4, open the third one-way valve (33), inject purified gas from the gas purifier or the purified gas storage device (3) into the transition chamber (2), then open the delivery pump (42) and the sixth one-way valve (43), and pump the gas in the transition chamber (2) into the gas storage tank (44) of the gas recycling device (4); repeat this process several times until the gas atmosphere in the transition chamber (2) meets the requirements, open the first sealed cabin door (12), move the object into the glove box body (1), and close the first sealed cabin door (12); S5, when the gas pressure in the glove box body (1) is too low, the second one-way valve (31) is opened, and the gas purifier or the purified gas storage device (3) is used to replenish the purified gas into the glove box body (1); when the gas pressure in the glove box body (1) is too high, the first one-way valve (41) is opened, and the excess gas in the glove box body (1) is moved into the gas storage tank (44) of the gas recycling device (4).

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