Safety protection device for pressure equalization tank of vpsa oxygen production equipment

Abstract

The embodiment of the present disclosure provides a kind of VPSA oxygen production equipment equalizing tank safety protection device, comprising: safety pressure relief valve, equalizing tank main body, flange, sealing gasket, elastic compression ring and fastening bolt;The safety pressure relief valve is fixed in the top opening of the equalizing tank main body by the flange, the sealing gasket is clamped between the flange, the elastic compression ring is nested before the flange, and the fastening bolt is uniformly penetrated along the circumference The flange and pre-tightening force are applied;Wherein, the bottom of the safety pressure relief valve is provided with stepped sealing surface, the sealing surface is stepped, and contains at least two annular planes with decreasing diameter;Wherein, the bottom of the flange is provided with annular groove, and the flange portion of the sealing gasket is embedded in the annular groove;Wherein, the lower surface of the flange is also provided with mounting groove.The scheme of the embodiment of the present disclosure can enhance reliability.

Description

Technical Field

[0001] This application relates to the field of safety protection technology for pressure swing adsorption (PSA) oxygen generators, specifically to a safety protection device for the equalizing tank of a PSA oxygen generator. Background Technology

[0002] The VPSA oxygen generator pressure equalization tank safety protection device is a key component in the vacuum pressure swing adsorption oxygen generation system. It is designed to monitor and regulate pressure fluctuations in the pressure equalization tank to prevent safety risks such as overpressure or leakage, and to ensure the stable operation of the oxygen generation process. However, there is a problem with how to enhance the reliability of this device. Specifically, during long-term use, the failure rate may increase due to environmental factors or component aging, thereby affecting its continuous protection capability. Summary of the Invention

[0003] In view of this, the present disclosure provides a safety protection device for the equalization tank of a VPSA oxygen generator, which at least partially solves the problems existing in the prior art.

[0004] This application discloses a safety protection device for the equalizing tank of a VPSA oxygen generator, comprising: a safety relief valve, the equalizing tank body, a flange, a sealing gasket, an elastic pressure ring, and fastening bolts;

[0005] The safety relief valve is fixed to the top opening of the equalizing tank body via the flange. The sealing gasket is sandwiched between the flanges. The elastic pressure ring is nested in front of the flange. The fastening bolts penetrate the flange evenly in the circumferential direction and are pre-tightened.

[0006] The safety relief valve has a stepped sealing surface at its bottom, the sealing surface being stepped and including at least two annular planes with decreasing diameters; wherein, the flange bottom is provided with an annular groove, and the flange portion of the sealing gasket is embedded in the annular groove; wherein,

[0007] The lower surface of the flange is also provided with a mounting groove, and the elastic pressure ring has a corrugated structure that matches the mounting groove.

[0008] According to one embodiment, the stepped sealing surface comprises three annular contact planes with decreasing diameters, adjacent annular contact planes are transitioned by a 45° chamfer, and the width of the smallest diameter plane is 1 / 3 of the width of the largest diameter plane.

[0009] According to one embodiment, the sealing gasket comprises, from the inside out, a graphite layer, a stainless steel mesh layer, and a fluororubber layer, with a total thickness of 5-8 mm.

[0010] According to one embodiment, the flange of the sealing gasket is provided with a 45° chamfer, the chamfer height is 1 / 4 to 1 / 3 of the total height of the flange, and the chamfer surface is provided with an anti-stick coating.

[0011] According to one embodiment, the corrugated structure of the elastic pressure ring includes multiple continuous sinusoidal waveform undulations, with a peak-to-trough height difference of 2-3 mm and a wavelength of 15-20 mm.

[0012] According to one embodiment, the corrugated structure of the elastic pressure ring is embedded with shape memory alloy wires, the shape memory alloy wires having a diameter of 1-5 mm and three wires arranged at equal intervals along the circumference.

[0013] According to one embodiment, a rubber buffer layer is provided at the bottom of the mounting groove, and the thickness of the rubber buffer layer is 1-5mm.

[0014] According to one embodiment, the inner wall of the bolt holes of the flange is provided with a polytetrafluoroethylene lubricating layer with a thickness of 2-1 mm.

[0015] According to one embodiment, the surface of the flange is provided with a laser-clad nickel-based alloy anti-corrosion layer with a thickness of 5-3 mm.

[0016] This disclosure provides a safety protection device for the equalizing tank of a VPSA oxygen generator, comprising: a safety relief valve, a tank body, a flange, a gasket, an elastic pressure ring, and fastening bolts. The safety relief valve is fixed to the top opening of the equalizing tank body via the flange. The gasket is sandwiched between the flanges, and the elastic pressure ring is nested in front of the flange. The fastening bolts penetrate the flange circumferentially and apply preload. The bottom of the safety relief valve has a stepped sealing surface, which is stepped and includes at least two annular planes with decreasing diameters. The bottom of the flange has an annular groove, and the flange of the gasket is embedded in the annular groove. The lower surface of the flange also has a mounting groove, and the elastic pressure ring has a corrugated structure that mates with the mounting groove. This disclosure addresses how to enhance reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the exemplary embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the structure of a safety protection device for the pressure equalization tank of a VPSA oxygen generator as described in this utility model;

[0019] Figure 2 This utility model describes a safety protection device for the equalization tank of a VPSA oxygen generator. Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is an exploded schematic diagram showing the connection relationship between the flange, sealing gasket, and elastic pressure ring in a safety protection device for the equalizing tank of a VPSA oxygen generator as described in this utility model.

[0021] Figure 4 This is a schematic diagram of the sealing gasket in the safety protection device for the pressure equalization tank of a VPSA oxygen generator according to this utility model;

[0022] Figure 5 This is a top sectional view of the sealing gasket in the safety protection device for the equalizing tank of a VPSA oxygen generator described in this utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of the elastic pressure ring in the safety protection device for the equalizing tank of a VPSA oxygen generator described in this utility model.

[0024] In the diagram: 1. Safety relief valve; 1a. Stepped sealing surface; 1b. Reversing groove; 1c. Mounting groove; 2. Body of equalizing tank; 3. Flange; 4. Sealing gasket; 4a. Graphite layer; 4b. Stainless steel mesh; 4c. Fluororubber layer; 4d. Chamfer; 4e. Anti-stick coating; 5. Elastic pressure ring; 5a. Shape memory alloy wire; 6. Fastening bolt; 7. Rubber buffer layer; 8. PTFE lubricating layer; 9. Laser cladding nickel-based alloy anti-corrosion layer. Detailed Implementation

[0025] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0026] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0027] like Figures 1-6 As shown, a safety protection device for the equalizing tank of a VPSA oxygen generator according to this application includes a safety relief valve 1, an equalizing tank body 2, a flange 3, a sealing gasket 4, an elastic pressure ring 5, and fastening bolts 6. The safety relief valve 1 is fixed to the top opening of the equalizing tank body 2 via the flange 3, forming a critical pressure release interface. The bottom of the valve seat of the safety relief valve 1 is designed with a stepped sealing surface 1a, which includes at least two annular contact planes with decreasing diameters to provide a multi-stage sealing effect; for example, during the manufacturing process, annular planes with decreasing diameters are sequentially formed at the bottom of the valve seat through precision machining (such as turning or grinding processes) to ensure that the pressure is distributed stepwise under high pressure and to prevent single seal failure. In addition, the bottom of the flange 3 of the safety relief valve 1 is provided with an annular groove to accommodate the flange of the sealing gasket 4 and achieve axial positioning; at the same time, the lower surface of the flange 3 is also machined with a wave-shaped elastic pressure ring 5 mounting groove 1c. The undulating profile of the groove matches the corrugated structure of the elastic pressure ring 5 to form a radial compensation mechanism; for example, the mounting groove 1c can be machined into a wave-shaped groove by a CNC milling machine to absorb dimensional changes caused by thermal expansion or vibration.

[0028] The equalizing tank body 2, as the core pressure-bearing component, has an opening at the top for installing the safety relief valve 1. This body is typically made of high-strength steel, and its internal volume is designed to buffer pressure fluctuations; for example, it is formed into a cylindrical structure through welding or forging processes, and the edge of the top opening is machined into a flange connection surface for easy mating with the flange 3, ensuring the stability and pressure resistance of the overall structure.

[0029] Flange 3, as a connecting element, is fixed between the top opening of the equalizing tank body 2 and the safety relief valve 1, providing mechanical support and a sealing base. Its structure includes mating surfaces with the flanges of the equalizing tank body 2 and the safety relief valve 1, wherein the lower surface is provided with a corrugated mounting groove 1c; for example, flange 3 can adopt a standard flange design, formed by casting or machining, and the corrugated profile of mounting groove 1c is achieved by wire cutting or laser processing to cooperate with the compensation function of the elastic pressure ring 5.

[0030] A sealing gasket 4 is sandwiched between the flange 3 of the safety relief valve 1 and the flange 3 of the equalizing tank body 2. Its flange portion is designed to be embedded in the annular groove of the flange 3 of the safety relief valve 1, forming an axial limit. This gasket is usually made of an elastic material (such as graphite or a metal composite); for example, during assembly, the flange portion is pressed into the groove, and the geometric constraint of the groove prevents the gasket from shifting under pressure fluctuations, ensuring the stability of the sealing interface.

[0031] The elastic pressure ring 5 is nested before the flange 3, and its corrugated structure matches the undulating profile of the wavy mounting groove 1c of the flange 3 to form a radial compensation structure. This pressure ring can be made of spring steel or an elastic alloy; for example, the corrugated structure is formed by stamping or rolling. During installation, the corrugations of the pressure ring engage with the wavy profile of the mounting groove 1c, providing radial elastic deformation during thermal expansion or pressure changes to compensate for connection gaps and prevent leakage.

[0032] The fastening bolts 6 penetrate the flange 3 evenly along the circumference, applying a preload to secure the entire connection assembly. The bolts are typically made of high-strength alloy steel and are evenly distributed; for example, during installation, the bolts apply a preset torque through the threaded connection, pressing the flange 3, gasket 4, and elastic pressure ring 5 together to form a uniform sealing pressure, preventing loosening or failure.

[0033] The aforementioned features address the technical challenge of enhancing reliability, primarily through multiple sealing and compensation mechanisms: the stepped sealing surface 1a provides at least two annular contact planes, forming a progressive sealing barrier under high pressure to reduce the risk of single-point failure; the annular groove axially limits the flange of the sealing gasket 4, preventing leakage caused by gasket displacement; the corrugated mounting groove 1c, in conjunction with the corrugated engagement of the elastic pressure ring 5, provides radial thermal expansion and vibration compensation, maintaining sealing stability; and the uniform preload of the fastening bolts 6 ensures a secure connection. Overall, these structures work together to improve durability and safety performance under the high-pressure environment of VPSA oxygen generators, preventing seal failure caused by pressure fluctuations or temperature changes.

[0034] A stepped sealing surface 1a is located at the bottom of the valve seat of the safety relief valve 1, serving as a key sealing structure in contact with the sealing gasket 4. This sealing surface employs a multi-stage annular design, comprising three annular contact planes with progressively decreasing diameters. These planes are arranged axially, extending from the outside of the valve seat towards the center. The decreasing diameter ensures staged sealing support under high pressure conditions. Adjacent annular contact planes are transitioned by a 45° chamfer 4d. This chamfer 4d design smoothly connects the planes, avoiding stress concentration and optimizing the fluid flow path, thus reducing the risk of leakage. Furthermore, the width of the smallest diameter plane is set to one-third of the width of the largest diameter plane. This proportional relationship enhances the uniformity and stability of the seal, especially maintaining effective contact under pressure fluctuations.

[0035] like Figure 4As shown, in one embodiment, the stepped sealing surface 1a of the safety protection device for the equalizing tank of the VPSA oxygen generator of this application can be achieved by machining. For example, three annular planes with decreasing diameters can be machined sequentially at the bottom of the valve seat of the safety relief valve 1 using a CNC lathe or milling process, and a 45° chamfered transition area 4d can be cut between adjacent planes. At the same time, the width of the smallest diameter plane is strictly controlled to be one-third of the largest diameter plane to ensure precise matching of the contact surface of the sealing gasket 4.

[0036] like Figure 5 As shown, in one embodiment, a sealing gasket 4 of a VPSA oxygen generator equalizing tank safety protection device is sandwiched between the flange 3 of the safety relief valve 1 and the flange 3 of the equalizing tank body 2, providing a reliable seal during high-pressure operation. The sealing gasket 4 adopts a three-layer composite structure, comprising, from the inside out, a graphite layer 4a, a stainless steel mesh layer, and a fluororubber layer 4c. The graphite layer 4a is located on the innermost side, directly contacting the valve body medium, possessing excellent high-temperature resistance and self-lubricating properties, suitable for long-term operation in oxygen environments; the stainless steel mesh layer serves as the middle layer, providing structural support and resistance to deformation, enhancing the overall mechanical strength and fatigue resistance of the gasket; the fluororubber layer 4c is located on the outermost side, exposed to the external environment, possessing high corrosion resistance and elastic recovery properties, ensuring the maintenance of seal integrity under temperature fluctuations. The three layers are tightly bonded through a lamination process, with the total thickness controlled within the range of 5 mm to 8 mm to accommodate the installation gap and preload distribution requirements between the flanges 3, avoiding seal failure due to excessive thinness or stress concentration due to excessive thickness.

[0037] During manufacturing, the sealing gasket 4 can achieve a three-layer structure integration through hot-pressing composite technology. For example, first, a graphite layer 4a is prepared as a base, then a stainless steel mesh layer is laid and fixed by spot welding, and finally a fluororubber layer 4c is covered and vulcanized to ensure seamless bonding between the layers. Specifically, the total thickness is precisely measured and adjusted to between 5mm and 8mm. After manufacturing, the gasket is embedded in the annular groove of the flange 3 to form axial positioning.

[0038] like Figure 4 As shown, in one embodiment, the flange of the sealing gasket 4 of the safety protection device for the equalizing tank of a VPSA oxygen generator according to this application is configured with a specific geometry and surface treatment. Specifically, the flange has a 45° chamfer 4d, which is located in the edge region of the flange and its height is limited to 1 / 4 to 1 / 3 of the total height of the flange, thereby optimizing the edge profile of the gasket. The design of the chamfer 4d ensures that the flange can smoothly fit into the groove of the relevant component during installation, reducing assembly stress concentration. In addition, the surface of the chamfer 4d is uniformly covered with an anti-stick coating 4e, which is applied in the form of a thin film to enhance the surface's anti-stick properties.

[0039] The anti-stick coating 4e is achieved through spraying or dipping processes, forming a continuous cover layer. Its material can be selected from polytetrafluoroethylene (PTFE) or silicone-based compounds to provide durable lubrication and isolation effects. The chamfered 4d structure of the flange is completed during manufacturing through machining processes such as turning or grinding, ensuring that the chamfered 4d angle and height accuracy meet design requirements. Specifically, in the technical implementation, the flange of the sealing gasket 4 undergoes surface pretreatment after machining to remove impurities. Subsequently, the anti-stick coating 4e is applied using automated spraying equipment, with the coating thickness controlled within the range of 5-10 micrometers. A curing process ensures its adhesion and durability.

[0040] The corrugated structure of the elastic pressure ring 5 is designed to contain multiple continuous sinusoidal waveform undulations. This waveform characteristic ensures uniform radial elastic compensation during device operation. The sinusoidal waveform undulations, through their periodic changes, effectively disperse pressure and adapt to thermal expansion or mechanical vibration, thereby improving the reliability and lifespan of the sealing system. The height difference between the crests and troughs is limited to a range of 2-3 mm. This size range optimizes the deformation capacity of the elastic pressure ring 5, enabling it to generate sufficient compression rebound under preload while avoiding structural fatigue or failure due to excessive deformation. Simultaneously, the wavelength is set at 15-20 mm. This parameter range balances the wave distribution density, ensuring a continuous and stable undulating profile in the circumferential direction for efficient absorption of radial displacement and vibration energy. The overall structure, through the continuity of the sinusoidal waveform, achieves gapless elastic support, enhancing the sealing performance of the device under high-pressure environments.

[0041] like Figure 6 As shown, in one embodiment, the elastic pressure ring 5 of the safety protection device for the equalizing tank of a VPSA oxygen generator of this application can be manufactured by stamping or precision casting process to form a structure with sinusoidal waveform undulation, wherein the height difference between the peak and the trough is precisely controlled between 2-3mm and the wavelength is maintained within the range of 15-20mm; specifically, the elastic pressure ring 5 is nested in the wave-shaped elastic pressure ring 5 mounting groove 1c of the flange 3 to ensure that the corrugated structure is completely matched with the undulation profile of the mounting groove 1c, and the radial compensation function is achieved by the pre-tightening force applied by the fastening bolt 6.

[0042] Within the corrugated structure of the elastic pressure ring 5, shape memory alloy wires 5a are embedded. These wires are integrated into the undulating portions of the corrugations to enhance the structure's adaptability and stability. Specifically, the shape memory alloy wires 5a are embedded within the grooves or gaps of the corrugations, forming an integrated structure to ensure a tight fit during thermal deformation or pressure fluctuations. The shape memory alloy wires 5a are evenly distributed along the circumference of the elastic pressure ring 5, and the number is fixed at three to achieve a symmetrical compensation effect.

[0043] The diameter of the shape memory alloy wires 5a is set in the range of 5 to 1 mm, preferably in the middle range to balance elasticity and strength. For example, the diameter can be selected as 3 mm or 4 mm to accommodate the thermal expansion requirements under different operating conditions. These shape memory alloy wires 5a are arranged at equal intervals inside the corrugated structure to form a ring array, thereby providing a uniform stress distribution and temperature response in the circumferential direction.

[0044] like Figure 3 As shown, in one embodiment, the elastic pressure ring 5 of the safety protection device for the equalizing tank of a VPSA oxygen generator according to this application is manufactured with a corrugated structure, for example, by embedding pre-made shape memory alloy wires 5a in the corrugated grooves through die casting or injection molding. Specifically, the shape memory alloy wires 5a are made of nickel-titanium alloy material, machined to a diameter of 4 mm, and arranged in three circumferentially at 120-degree intervals. They are fixed to the inner wall of the corrugation by laser welding to ensure that the fit with the mounting groove 1c maintains the radial compensation function.

[0045] A rubber buffer layer 7 is provided at the bottom of the mounting groove 1c for the corrugated elastic pressure ring 5. This buffer layer is directly attached to the bottom surface of the groove to provide mechanical cushioning and stress dispersion. Specifically, the rubber buffer layer 7 is fixed to the bottom of the groove by adhesive or pressing, forming a continuous cover layer to ensure stable contact during the installation of the elastic pressure ring 5. The thickness of this buffer layer is designed to be between 1 mm and 5 mm to balance the cushioning effect and space occupation, avoiding interference with the undulating contour of the mounting groove 1c. At the same time, the Shore hardness of the rubber buffer layer 7 is set between 60 HA and 70 HA to ensure that it has sufficient elasticity and resistance to compression deformation to adapt to the periodic pressure fluctuations during user operation. In addition, the rubber buffer layer 7 is preferably made of vulcanized rubber material, and its surface can be textured to enhance adhesion to the bottom of the groove and wear resistance.

[0046] In such Figure 3 As shown, in one embodiment, the rubber buffer layer 7 of the safety protection device for the equalizing tank of a VPSA oxygen generator of this application is pre-cut into an annular strip that matches the shape of the bottom of the groove 1c of the corrugated elastic pressure ring 5, and uniformly coated on the bottom surface of the groove with a high-temperature resistant epoxy resin adhesive, and then cured and fixed at room temperature to achieve seamless fit and reliable connection with the bottom of the groove.

[0047] A polytetrafluoroethylene (PTFE) lubricating layer 8 is provided on the inner wall of the bolt hole of flange 3. This layer is directly coated or deposited on the inner surface of the bolt hole, forming a continuous and uniform coating. PTFE material has a low coefficient of friction. This lubricating layer is located at the interface between the fastening bolt 6 and the bolt hole, optimizing the bolt assembly process by reducing frictional resistance. The thickness of the lubricating layer is controlled within the range of 1 mm to 0.2 mm to ensure sufficient lubrication while avoiding affecting the bolt hole diameter. Furthermore, the surface roughness Ra value of the lubricating layer does not exceed 0.8 micrometers, which is achieved through precision machining to provide a smooth contact surface and reduce the risk of wear during assembly.

[0048] like Figure 3 As shown, in one embodiment, the polytetrafluoroethylene (PTFE) lubricating layer 8 of the safety protection device for the equalizing tank of a VPSA oxygen generator according to this application can be achieved through a spraying process. Specifically, firstly, the inner wall of the bolt hole is cleaned to remove oil and impurities. Then, the PTFE coating is uniformly applied using electrostatic spraying or dip coating. After coating, a curing process is performed to achieve the specified thickness and surface roughness requirements. For example, the curing temperature is controlled within the range of 300-400 degrees Celsius to ensure that the coating adheres firmly, and the roughness is adjusted to Ra≤0.8μm through grinding or polishing steps.

[0049] like Figure 3 As shown, in one embodiment, the contact surface of the flange 3 of the safety protection device for the equalizing tank of a VPSA oxygen generator according to this application is provided with an anti-corrosion layer. This anti-corrosion layer is formed using a laser cladding process and is specifically made of a nickel-based alloy material. It is located in the area where the flange 3 contacts other components to enhance corrosion resistance. As a key component connecting the safety relief valve 1 and the equalizing tank body 2, the flange 3's contact surface directly faces the external environment or internal medium; therefore, the anti-corrosion layer helps extend its service life.

[0050] The thickness of the anti-corrosion layer ranges from 0.5 mm to 3.0 mm, and uniform coverage is achieved through precise control of laser cladding parameters. The nickel-based alloy was chosen based on its excellent resistance to chemical corrosion and wear. This layer is directly clad onto the surface of flange 3, forming a metallurgical bond that ensures a tight bond with the base material without adding extra complexity to the connection structure.

[0051] For example, by pre-treating the surface of flange 3 to remove impurities, nickel-based alloy powder is then transported to the contact surface using a laser cladding device, where it is melted and deposited under the action of a high-energy laser beam. The laser power and scanning speed are adjusted to control the layer thickness within the range of 0.5 mm to 3.0 mm.

[0052] In actual operation, when this device is in use, the safety relief valve 1 is fixed to the top opening of the equalizing tank body 2 via the flange 3. The sealing gasket 4 is sandwiched between the flange 3 of the safety relief valve 1 and the flange 3 of the equalizing tank body 2. The elastic pressure ring 5 is nested on the flange 3, and a pre-tightening force is applied circumferentially by the fastening bolts 6 to form an initial seal. Under normal pressure, the stepped sealing surface 1a of the safety relief valve 1 cooperates with the valve seat, and multi-stage sealing is achieved by using multiple annular contact planes with decreasing diameters to prevent gas leakage. When the pressure inside the equalizing tank rises abnormally and exceeds the set threshold, the safety relief valve 1 automatically opens to release excess gas to reduce pressure and ensure equipment safety. During this process, the flange of the sealing gasket 4 is embedded in the annular groove at the bottom of the flange 3 of the safety relief valve 1 to form an axial limit and prevent displacement. At the same time, the corrugated structure of the elastic pressure ring 5 cooperates with the contour of the wavy mounting groove 1c on the lower surface of the flange 3 to provide radial compensation to absorb thermal expansion or mechanical vibration and maintain the integrity of the seal.

[0053] This document describes several embodiments of the present invention; however, for the sake of brevity, the descriptions of the embodiments are not exhaustive, and identical or similar features or parts between the embodiments may be omitted. In this document, "one embodiment," "some embodiments," "example," "specific example," or "some examples" refers to embodiments applicable to at least one, but not all, of the present invention. The above terms do not necessarily refer to the same embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of the different embodiments or examples.

[0054] The exemplary systems and methods of the present invention have been specifically shown and described with reference to the above embodiments, which are merely examples of the best mode for implementing the systems and methods. Those skilled in the art will understand that various changes can be made to the embodiments of the systems and methods described herein without departing from the spirit and scope of the invention as defined in the appended claims when implementing the systems and / or methods.

Claims

1. A safety protection device for the equalizing tank of a VPSA oxygen generator, characterized in that, include: Safety relief valve (1), pressure equalizing tank body (2), flange (3), sealing gasket (4), elastic pressure ring (5) and fastening bolts (6); The safety relief valve (1) is fixed to the top opening of the equalizing tank body (2) via the flange (3), the sealing gasket (4) is sandwiched between the flanges (3), the elastic pressure ring (5) is nested in front of the flange (3), and the fastening bolts (6) penetrate the flange (3) evenly in the circumferential direction and apply preload; wherein, The safety relief valve (1) has a stepped sealing surface (1a) at its bottom. The sealing surface (1a) is stepped and includes at least two annular planes with decreasing diameters. The flange (3) has an annular groove (1b) at its bottom, and the flange of the sealing gasket (4) is embedded in the annular groove (1b). The lower surface of the flange (3) is also provided with a mounting groove (1c), and the elastic pressure ring (5) has a corrugated structure that matches the mounting groove (1c).

2. The safety protection device for the equalizing tank of a VPSA oxygen generator according to claim 1, characterized in that: The stepped sealing surface (1a) comprises three annular contact planes with decreasing diameters, adjacent annular contact planes are transitioned by a 45° chamfer, and the width of the smallest diameter plane is 1 / 3 of the width of the largest diameter plane.

3. The safety protection device for the pressure equalization tank of a VPSA oxygen generator according to claim 1, characterized in that: The sealing gasket (4) consists of a graphite layer (4a), a stainless steel mesh layer (4b), and a fluororubber layer (4c) from the inside out, with a total thickness of 5-8 mm.

4. A safety protection device for the equalizing tank of a VPSA oxygen generator according to claim 3, characterized in that: The flange of the sealing gasket (4) is provided with a 45° chamfer (4d), the height of the chamfer (4d) is 1 / 4 to 1 / 3 of the total height of the flange, and the surface of the chamfer (4d) is provided with an anti-stick coating (4e).

5. A safety protection device for the equalizing tank of a VPSA oxygen generator according to claim 1, characterized in that: The corrugated structure of the elastic pressure ring (5) contains multiple continuous sinusoidal waveform undulations, with a height difference of 2-3 mm between the peaks and troughs and a wavelength of 15-20 mm.

6. A safety protection device for the equalizing tank of a VPSA oxygen generator according to claim 5, characterized in that: The corrugated structure of the elastic pressure ring (5) is embedded with a shape memory alloy wire (5a), the shape memory alloy wire (5a) has a diameter of 1-5mm and three wires are arranged at equal intervals along the circumference.

7. A safety protection device for the equalizing tank of a VPSA oxygen generator according to claim 1, characterized in that: The bottom of the mounting groove (1c) is provided with a rubber buffer layer (7), the thickness of which is 1-5mm.

8. A safety protection device for the equalizing tank of a VPSA oxygen generator according to claim 1, characterized in that: The inner wall of the bolt hole of the flange (3) is provided with a polytetrafluoroethylene lubricating layer (8) with a thickness of 0.2-1mm.

9. A safety protection device for the equalizing tank of a VPSA oxygen generator according to claim 1, characterized in that: The flange (3) has a laser-clad nickel-based alloy anti-corrosion layer (9) with a thickness of 0.5-3mm on its surface.

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