Sunken multi-person oxygen cabin device and using method thereof
By designing multiple independent accommodation spaces and sealing systems on the treatment platform of the multi-person oxygen chamber device, the problems of cross-infection and personalized treatment parameters are solved, and safe, comfortable and efficient hyperbaric oxygen chamber treatment is achieved.
Patent Information
- Application Number
- CN202510027527.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-05-06
AI Technical Summary
The existing multi-person hyperbaric oxygen chambers have the risk of cross-infection and the inability to set different treatment parameters according to the individual's physical condition.
A sinking multi-person oxygen chamber device is designed. By opening multiple downwardly extending accommodation spaces on the treatment platform, each accommodation space is independently equipped with a buffer tank, a movable sealing plate and a lifting sealing cover, the independent high-pressure oxygen chamber environment of each user is realized, and the coordinated work of the automatic pressure relief valve and the intake and exhaust valve can achieve pressure stability and personalized treatment parameter setting.
It effectively avoids the risk of cross-infection, improves user comfort and treatment effects, saves space, and improves the reliability and safety of the equipment.
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Figure CN119925117A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of oxygen chambers, in particular to a sinking multi-person oxygen chamber device and a use method thereof. Background Art
[0002] The oxygen chamber is a special medical device for high-pressure oxygen therapy. Its principle is to place the user in an oxygen-rich environment with a pressure higher than normal atmospheric pressure. Under the action of high pressure, oxygen is input into the respiratory and microcirculatory systems to reach various organs of the human body, increasing the level of arterial oxygen partial pressure and oxygen saturation to promote human metabolism. The treatment time of a high-pressure oxygen chamber is generally one to two hours. For shared places such as clinics or health care institutions, the high-pressure oxygen chamber is generally used as a shared device to provide treatment for different groups of people.
[0003] Currently, most commonly used multi-person hyperbaric oxygen chambers are single-space type, that is, all treatment personnel are in the same room for treatment. This type of single-space multi-person hyperbaric oxygen chamber is often designed with a transition chamber, which is mainly used by patients in the transition stage before entering the treatment chamber to ensure the safety and comfort of the patients. Before entering the hyperbaric oxygen chamber for treatment, patients need to enter the transition chamber first. The environment of the transition chamber is similar to that of the treatment chamber, but the pressure is lower, so that patients can gradually adapt to the high-pressure environment and reduce discomfort.
[0004] In actual use, after the patient enters the transition chamber, the pressure in the chamber slowly increases, and the patient needs to cooperate with swallowing or pinching the nose to inflate to avoid air pressure from damaging the eardrum. When the patient adapts, the pressure in the transition chamber will gradually increase, and eventually be consistent with the pressure in the treatment chamber, and the patient will enter the treatment chamber for formal treatment. However, the above scheme has the following defects: (1) Since the hyperbaric oxygen chamber is a closed space, when multiple people are treated together, there is a very high risk of cross-infection, which is not conducive to disease prevention; (2) Due to the different physical conditions of each user, the specific values of some key treatment parameters such as the rate of increase and decrease of pressure and the treatment pressure value often vary from person to person, and the treatment of multiple people in the same space limits everyone to treatment under one working condition, resulting in the inability to set different treatment parameters according to each person's physical condition, which in turn leads to the treatment plan of some therapists not being optimal. Summary of the invention
[0005] In order to solve the above technical problems, the present invention specifically adopts the following technical solutions.
[0006] A sinking multi-person oxygen chamber device is designed, comprising a treatment platform, a plurality of downwardly extending accommodation spaces are provided on the upper surface of the treatment platform, and each accommodation space can accommodate a user, a sealed buffer tank is coaxially provided at the bottom of each accommodation space, a movable sealing plate moving up and down along the buffer tank is provided in the buffer tank, and the movable sealing plate is sealedly connected to the inner wall of the buffer tank, a plurality of guide rods penetrating the treatment platform are provided around each accommodation space, and a lifting sealing cover is provided directly above each accommodation space, the top and bottom of the guide rods are respectively connected to the lifting sealing cover and the movable sealing plate, and when the lifting sealing cover is lowered to the lowest end, its lower end surface is sealed and fitted with the upper end surface of the accommodation space;
[0007] A lower air inlet interface and an exhaust interface are respectively provided at the bottom of each buffer tank, the lower air inlet interface is connected to a bottom air inlet valve, the exhaust interface is connected to an exhaust valve, an upper air inlet interface is provided on one side of the upper end of the buffer tank, the upper air inlet interface is connected to an upper air inlet valve, and each bottom air inlet valve is connected in parallel to the same lower air inlet pipeline, each exhaust valve is connected in parallel to the same exhaust pipeline, and each upper air inlet valve is connected in parallel to the same upper air inlet pipeline, a high-pressure air tank connected to a high-pressure air source is provided on one side of the buffer tank, and the lower air inlet pipeline and the upper air inlet pipeline are respectively connected to the high-pressure air tank;
[0008] A plurality of lower automatic pressure relief valves are arranged at the connection between the accommodation space and the buffer tank, and a plurality of upper automatic pressure relief valves are arranged on the top of the lifting sealing cover.
[0009] Preferably, an annular sealing strip is provided at the lower end of the lifting sealing cover.
[0010] Preferably, a sunken oxygen production module is provided on the treatment platform near each accommodating space, and an oxygen output pipe of the oxygen production module is connected to the accommodating space.
[0011] Preferably, the number of the lower automatic pressure relief valve and the number of the upper automatic pressure relief valve are both two.
[0012] Preferably, an O-ring is sleeved on each guide rod.
[0013] Preferably, an annular sealing strip 2 is provided at the upper and lower ends of the movable sealing plate respectively.
[0014] Preferably, two sets of O-rings are sleeved on the movable sealing plate.
[0015] A method for using a sinking multi-person oxygen chamber device specifically comprises the following steps:
[0016] S1, in the initial stage, all upper air inlet valves and exhaust valves are closed, and all bottom air inlet valves and air sources of the high-pressure air tank are opened, so that the high-pressure air tank starts to take in air, and the air enters the lower space of each bottom buffer tank along the lower air inlet pipeline, pushing the movable sealing plate upward, so that the lifting sealing cover moves upward to the highest point under the drive of the guide rod, so that the inlet and outlet of the accommodation space are opened;
[0017] S2, after the user enters the corresponding accommodation space according to the arrangement, he or she controls himself or herself or centrally to open the upper air inlet valve and exhaust valve on the corresponding buffer tank, and close the bottom air inlet valve. High-pressure air enters the upper space of the buffer tank along the upper air inlet valve, and the movable sealing plate moves downward under the dual action of high-pressure air and gravity until the movable sealing plate drops to the lowest point. At the same time, driven by the guide rod, the corresponding lifting sealing cover also drops to the lowest point and forms a seal with the inlet and outlet of the accommodation space. The excess gas in the lower space of the movable sealing plate in the buffer tank is discharged along the exhaust valve;
[0018] S3, as high-pressure air continues to enter the upper space of the movable sealing plate in the buffer tank, the pressure in the upper space of the buffer tank gradually increases. When its pressure is greater than the pressure relief pressure of the upper automatic pressure relief valve, excess gas will enter the accommodation space. When the pressure in the accommodation space rises to the pressure relief pressure of the upper automatic pressure relief valve on the lifting seal cover, the upper automatic pressure relief valve starts to release pressure. At this time, the pressure in the accommodation space reaches the treatment pressure, and high-pressure treatment can be provided to the user stably.
[0019] S4. When the treatment is completed, first release the pressure in each accommodation space to normal pressure, then close the upper air inlet valve and exhaust valve by controlling, open the bottom air inlet valve, and the pressure pushes the movable sealing plate to rise, so that the lifting sealing cover also rises until it reaches the highest point. At this time, the user can leave the cabin to complete the treatment process.
[0020] Preferably, in step S1, when the movable sealing plate rises, causing the upper space of the buffer tank to increase in pressure, until the pressure is greater than the pressure relief pressure of the lower automatic pressure relief valve, excess gas will be discharged from the lower automatic pressure relief valve into the upper accommodation space.
[0021] The beneficial effects of the present invention are:
[0022] 1. The present invention provides a plurality of downwardly extending accommodation spaces on the treatment platform, each of which is equivalent to an independent oxygen chamber. This not only avoids the risk of cross infection, but also facilitates cleaning and disinfection, ensuring the health and safety of each user. Moreover, each accommodation space can set specific treatment parameters such as pressure, oxygen concentration, etc. according to the user's own conditions, thereby improving the user's comfort and treatment effect.
[0023] 2. The sunken design allows each storage space to extend downward, greatly saving ground space and improving space utilization, making it suitable for installation and use in limited space.
[0024] 3. The design of the movable sealing plate and lifting sealing cover, combined with multiple O-rings and annular sealing strips, ensures the sealing performance of the cabin during various operations. In particular, the regional sealing design of the movable sealing plate and the inner wall of the buffer tank ensures the precise control of the airflow and improves the reliability and safety of the equipment.
[0025] 4. The setting of the upper and lower automatic pressure relief valves can effectively maintain the pressure balance inside and outside the cabin, ensure the pressure stability during the treatment process, and avoid safety hazards caused by pressure fluctuations.
[0026] 5. Through the coordinated work of the upper air inlet valve, the exhaust valve and the bottom air inlet valve, the automatic rising and falling of the lifting sealing cover is realized, which simplifies the operation process, improves the automation level of the equipment and reduces the need for manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the overall structure of the structure of the present invention;
[0028] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;
[0029] Figure 3 It is a schematic diagram of the bottom structure of the present invention;
[0030] Figure 4 yes Figure 2 A is an enlarged structural diagram;
[0031] Figure 5 yes Figure 2 The enlarged structural diagram at B in FIG.
[0032] The numbers in the figure are: 1 lifting sealing cover, 2 oxygen production module, 3 treatment platform, 4 high-pressure air tank pressure relief valve, 5 high-pressure air tank, 6 gas source connecting pipe, 7 exhaust pipeline, 8 buffer tank, 9 guide rod, 10 upper automatic pressure relief valve, 11 upper air intake valve, 12 exhaust valve, 13 bottom air intake valve, 14 lower air intake pipeline, 15 upper air intake pipeline, 16 annular sealing strip one, 17 oxygen inlet, 18 upper air intake interface, 19 lower automatic pressure relief valve, 20 annular sealing strip two, 21 O-ring two, 22 movable sealing plate, 23 O-ring one, 24 accommodating space. DETAILED DESCRIPTION
[0033] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0034] Example 1
[0035] A sinking multi-person oxygen chamber device, such as Figures 1 to 5 As shown, it includes a treatment platform 3, and a plurality of downwardly extending accommodating spaces 24 are provided on the upper surface of the treatment platform 3, and each accommodating space 24 can accommodate one user. The accommodating space 24 is equivalent to an independent oxygen chamber, which can achieve single-person single-chamber treatment during centralized oxygen chamber treatment, avoiding the risk of cross infection and facilitating cleaning and disinfection. Specific treatment parameters can be set according to the user's own situation, thereby improving the user's comfort and experience, and ensuring the user's health and safety; coupled with the downwardly extending accommodating space 24, it saves more space and improves space utilization; a sunken oxygen production module 2 is provided near each accommodating space 24 on the treatment platform 3, and the oxygen output pipe of the oxygen production module 2 is connected to the accommodating space 24 to provide oxygen for the treatment in the accommodating space 24.
[0036] A sealed buffer tank 8 is coaxially arranged at the bottom of each accommodating space 24, a movable sealing plate 22 is arranged inside the buffer tank 8 to move up and down, and the movable sealing plate 22 is sealedly connected to the inner wall of the buffer tank 8, four guide rods penetrating the treatment platform 3 are arranged around each accommodating space 24, and an O-type sealing ring 23 is sleeved on each guide rod 9, and the O-type sealing ring 23 is located in the hole penetrated by the guide rod 9. The setting of the O-type sealing ring 23 can ensure the sealing of the guide rod 9 during the movement process, and isolate the airflow in the upper and lower spaces at the gap of the guide rod 9.
[0037] A lifting seal cover 1 is provided directly above each accommodating space 24. The top and bottom of the guide rod 9 are connected to the lifting seal cover 1 and the movable seal plate 22 respectively. The movable seal plate 22 is connected to the lifting seal cover 1 through the guide rod 9 and can move up and down together. An annular sealing strip 20 is provided at the upper and lower ends of the movable seal plate 22. The annular sealing strip 20 at the upper and lower ends of the movable seal plate 22 can achieve sealing with the upper air inlet interface 18, the lower air inlet interface, and the exhaust interface when in contact with the upper and lower end surfaces inside the buffer tank 8, and can also play a buffering role when in contact with the upper and lower end surfaces inside the buffer tank 8. Two sets of O-rings 21 are sleeved on the movable seal plate 22, which can cooperate with the inner wall of the buffer tank 8 to achieve regional sealing while ensuring that the movable seal plate 22 can move axially. When the lifting sealing cover 1 descends to the lowest end, its lower end surface is sealed and fitted with the upper end surface of the accommodating space 24, thereby forming a sealed cabin with the accommodating space 24 for the user to receive treatment. Specifically, an annular sealing strip 16 is provided at the lower end of the lifting sealing cover 1.
[0038] In specific applications, the entire device can be fixed to the ground through the treatment platform 3, so that the lifting sealing cover 1 above the treatment platform 3 is located above the ground, the buffer tank 8 and the high-pressure air tank 5 below the treatment platform 3 are located in a pre-dug pit, and the exhaust port of the exhaust pipe 7 extends out of the ground.
[0039] A lower air inlet interface and an exhaust interface are respectively provided at the bottom of each buffer tank 8, the lower air inlet interface is connected to a bottom air inlet valve 13, the exhaust interface is connected to an exhaust valve 12, an upper air inlet interface 18 is provided on one side of the upper end of the buffer tank 8, the upper air inlet interface 18 is connected to an upper air inlet valve 11, and each bottom air inlet valve 13 is connected in parallel to the same lower air inlet pipeline 14, each exhaust valve 12 is connected in parallel to the same exhaust pipeline 7, each upper air inlet valve 11 is connected in parallel to the same upper air inlet pipeline 15, a high-pressure air tank 5 connected to a high-pressure air source is provided on one side of the buffer tank 8, and the lower air inlet pipeline 14 and the upper air inlet pipeline 15 are respectively connected to the high-pressure air tank 5;
[0040] A plurality of lower automatic pressure relief valves 19 are provided at the connection between the accommodating space 24 and the buffer tank 8 for maintaining the pressure difference between the upper and lower spaces thereof. A plurality of upper automatic pressure relief valves 10 are provided on the top of the lifting sealing cover 1 for maintaining a stable treatment pressure. The number of the lower automatic pressure relief valves 19 and the number of the upper automatic pressure relief valves 10 are both two.
[0041] Example 2
[0042] A method for using a sinking multi-person oxygen chamber device specifically comprises the following steps:
[0043] S1, initial stage, close all upper air inlet valves 11 and exhaust valves 12, open all bottom air inlet valves 13 and air sources of high-pressure air tank 5, make high-pressure air tank 5 start to take in air, air enters into lower space of each bottom buffer tank 8 along lower air inlet pipeline 14, pushes movable sealing plate 22 upward, thereby driving lifting sealing cover 1 to move upward to the highest point under the drive of guide rod 9, at this time, the pressure relief pressure of two lower automatic pressure relief valves 19 at the connection between buffer tank 8 and accommodation space 24 is less than 50kpa, when the upward process of movable sealing plate 22 causes pressure rise in upper space of buffer tank 8, until the pressure is greater than the pressure relief pressure of lower automatic pressure relief valve 19, excess gas will be discharged from lower automatic pressure relief valve 19 into upper accommodation space 24; after a short upward process, all lifting sealing covers 1 have moved to the highest point, at this time, all accommodation spaces 24 are in empty state;
[0044] S2, when the user enters the corresponding storage space 24 according to the arrangement, he can control himself or centrally to open the upper air inlet valve 11 and the exhaust valve 12 on the corresponding buffer tank 8, and close the bottom air inlet valve 13. At this time, high-pressure air enters the upper space of the buffer tank 8 along the upper air inlet valve 11, and the movable sealing plate 22 moves downward under the dual effects of high-pressure air and gravity. The excess gas in the lower space of the movable sealing plate 22 in the buffer tank 8 is discharged along the exhaust valve 12; it should be specially noted that the exhaust valve 12 has a small effective diameter, which can control the slow discharge of air, thereby ensuring that the descending speed of the lifting and sealing cover 1 should not be too fast. When the movable sealing plate 22 drops to the lowest point, the annular sealing strip 20 on its lower side forms a seal with the bottom end face. At this time, the annular sealing strip 16 on the lower end face of the corresponding lifting and sealing cover 1 forms a seal with the upper inlet and outlet of the storage space 24;
[0045] S3, as high-pressure air continues to enter the upper space of the movable sealing plate 22 in the buffer tank 8, the pressure in the upper space of the buffer tank 8 gradually increases. When its pressure is greater than the pressure relief pressure of the upper automatic pressure relief valve 10, excess gas will enter the accommodating space 24. Since the space in the accommodating space 24 is also a sealed space at this time, the inside of the accommodating space 24 also begins to be pressurized. As the pressure gradually increases, a high-pressure environment will be formed in the bottom buffer tank 8 of the accommodating space 24 at the same time. There is always a constant pressure difference between the pressure in the bottom buffer tank 8 and the pressure in the accommodating space 24. This pressure difference is the pressure relief pressure of the lower automatic pressure relief valve 19 between the two. When the pressure in the accommodating space 24 rises to the pressure relief pressure of the upper automatic pressure relief valve 10 on the lifting sealing cover 1, the upper automatic pressure relief valve 10 begins to relieve pressure. At this time, the pressure in the accommodating space 24 reaches the treatment pressure, and high-pressure treatment can be provided to the user stably. At the beginning of treatment or during treatment, the side oxygen production module 2 is turned on to provide oxygen input to the oxygen cabin.
[0046] S4. When the treatment is completed, first release the pressure in each accommodating space 24 to normal pressure, then close the upper air inlet valve 11 and the exhaust valve 12 by controlling, open the bottom air inlet valve 13, and allow the lower space in the buffer tank 8 to start taking in air again. Driven by the pressure, the movable sealing plate 22 rises until the lifting sealing cover 1 rises to the highest point. At this time, the user can exit the cabin and complete the treatment process.
[0047] In this application, the selection of the automatic pressure relief valve and the change of the size of the lifting cover can be combined to achieve customized treatment pressure and pressure lifting and lowering speed, providing a more suitable treatment plan for users in different situations. In terms of safety, due to the effect of the bottom buffer tank, under the high pressure in the accommodation space, a greater pressure is always ensured in the bottom buffer tank, so that the movable sealing plate is pushed downward, thereby ensuring the sealing of the accommodation space and avoiding the pop-up of the lifting sealing cover, which is safer to use.
[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A sinking multi-person oxygen chamber device, characterized in that: It comprises a treatment platform, a plurality of downwardly extending accommodation spaces are provided on the upper surface of the treatment platform, and each accommodation space can accommodate a user, a sealed buffer tank is coaxially provided at the bottom of each accommodation space, a movable sealing plate is provided in the buffer tank and moves up and down along the buffer tank, and the movable sealing plate is sealedly connected to the inner wall of the buffer tank, a plurality of guide rods penetrating the treatment platform are provided around each accommodation space, a lifting sealing cover is provided directly above each accommodation space, the top and bottom of the guide rods are connected to the lifting sealing cover and the movable sealing plate respectively, and when the lifting sealing cover is lowered to the lowest end, the lower end surface thereof is sealed and fitted with the upper end surface of the accommodation space; A lower air inlet interface and an exhaust interface are respectively provided at the bottom of each buffer tank, the lower air inlet interface is connected to a bottom air inlet valve, the exhaust interface is connected to an exhaust valve, an upper air inlet interface is provided on one side of the upper end of the buffer tank, the upper air inlet interface is connected to an upper air inlet valve, and each bottom air inlet valve is connected in parallel to the same lower air inlet pipeline, each exhaust valve is connected in parallel to the same exhaust pipeline, and each upper air inlet valve is connected in parallel to the same upper air inlet pipeline, a high-pressure air tank connected to a high-pressure air source is provided on one side of the buffer tank, and the lower air inlet pipeline and the upper air inlet pipeline are respectively connected to the high-pressure air tank; A plurality of lower automatic pressure relief valves are arranged at the connection between the accommodation space and the buffer tank, and a plurality of upper automatic pressure relief valves are arranged on the top of the lifting sealing cover.
2. The sunken multi-person oxygen chamber device according to claim 1, characterized in that: An annular sealing strip 1 is arranged at the lower end of the lifting sealing cover.
3. The sunken multi-person oxygen chamber device according to claim 1, characterized in that: A sunken oxygen production module is provided on the treatment platform near each accommodating space, and an oxygen output pipe of the oxygen production module is connected to the accommodating space.
4. The sunken multi-person oxygen chamber device according to claim 1, characterized in that: The number of the lower automatic pressure relief valve and the number of the upper automatic pressure relief valve are both two.
5. The sunken multi-person oxygen chamber device according to claim 1, characterized in that: An O-type sealing ring is sleeved on each guide rod.
6. The sunken multi-person oxygen chamber device according to claim 1, characterized in that: Two annular sealing strips are respectively arranged at the upper and lower ends of the movable sealing plate.
7. The sunken multi-person oxygen chamber device according to claim 1, characterized in that: Two groups of O-type sealing rings are sleeved on the movable sealing plate.
8. A method for using the sinking multi-person oxygen chamber device according to any one of claims 1 to 7, characterized in that: The specific steps include: S1, in the initial stage, all upper air inlet valves and exhaust valves are closed, and all bottom air inlet valves and air sources of the high-pressure air tank are opened, so that the high-pressure air tank starts to take in air, and the air enters the lower space of each bottom buffer tank along the lower air inlet pipeline, pushing the movable sealing plate upward, so that the lifting sealing cover moves upward to the highest point under the drive of the guide rod, so that the inlet and outlet of the accommodation space are opened; S2, after the user enters the corresponding accommodation space according to the arrangement, he or she controls himself or herself or centrally to open the upper air inlet valve and exhaust valve on the corresponding buffer tank, and close the bottom air inlet valve. High-pressure air enters the upper space of the buffer tank along the upper air inlet valve, and the movable sealing plate moves downward under the dual action of high-pressure air and gravity until the movable sealing plate drops to the lowest point. At the same time, driven by the guide rod, the corresponding lifting sealing cover also drops to the lowest point and forms a seal with the inlet and outlet of the accommodation space. The excess gas in the lower space of the movable sealing plate in the buffer tank is discharged along the exhaust valve; S3, as high-pressure air continues to enter the upper space of the movable sealing plate in the buffer tank, the pressure in the upper space of the buffer tank gradually increases. When its pressure is greater than the pressure relief pressure of the upper automatic pressure relief valve, excess gas will enter the accommodation space. When the pressure in the accommodation space rises to the pressure relief pressure of the upper automatic pressure relief valve on the lifting seal cover, the upper automatic pressure relief valve starts to release pressure. At this time, the pressure in the accommodation space reaches the treatment pressure, and high-pressure treatment can be provided to the user stably. S4. When the treatment is completed, first release the pressure in each accommodation space to normal pressure, then control and close the upper air inlet valve and exhaust valve, open the bottom air inlet valve, so that the lower space of the buffer tank begins to take in air and increase the pressure. The pressure pushes the movable sealing plate up, causing the lifting sealing cover to rise together until it reaches the highest point. At this time, the user can leave the cabin to complete the treatment process.
9. A method for using the sinking multi-person oxygen chamber device as claimed in claim 8, characterized in that: In step S1, when the movable sealing plate rises, causing the upper space of the buffer tank to increase in pressure until the pressure is greater than the pressure relief pressure of the lower automatic pressure relief valve, the excess gas will be discharged from the lower automatic pressure relief valve into the upper accommodation space.