Oxygen supply device

Abstract

The application discloses an oxygen supply device, which comprises a device body, a pre-filter, an air compressor, a heat exchanger, an electromagnetic valve, a control circuit, an air adsorption device, an oxygen storage tank and an oxygen supply mechanism which are sequentially connected in the device body. The air adsorption device comprises an air conveying structure, an oxygen conveying structure, a nitrogen output structure and at least two molecular sieve towers which are connected in series. The molecular sieve towers have a first working state of adsorbing oxygen and a second working state of backwashing and discharging nitrogen. The oxygen supply device further comprises a gas pressure sensing detection member and a gas pressure elastic detection member which are arranged in an air inlet cavity. With the gradual increase of the air pressure in the air inlet cavity, the gas pressure sensing detection member and the gas pressure elastic detection member are triggered in sequence to switch the molecular sieve towers from the first working state to the second working state. The oxygen supply device can quickly discharge nitrogen in the air adsorption device, thereby improving the efficiency and quality of air oxygen production.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an oxygen supply device. Background Technology

[0002] For patients in the intensive care unit, breathing difficulties can easily lead to symptoms such as chest tightness, shortness of breath, headache, and dizziness. An effective way to alleviate these symptoms is to provide oxygen or administer oxygen therapy. Current technology uses oxygen cylinders to provide oxygen to patients. However, with the increasing oxygen consumption of ventilators, the limited oxygen storage capacity of oxygen cylinders necessitates frequent cylinder replacements. Simultaneously, existing technologies also utilize oxygen supply systems and oxygen generators to provide uninterrupted oxygen supply. Current oxygen generators generally consist of filters, air compressors, cooling systems, control circuits, adsorption mechanisms, and oxygen storage tanks. The adsorption mechanism utilizes molecular sieve physical adsorption and desorption technology to generate oxygen. The adsorption mechanism is filled with molecular sieves, which adsorb nitrogen from the air during pressurization. The remaining unabsorbed oxygen is collected and purified to become high-purity oxygen. During depressurization, the molecular sieves release the adsorbed nitrogen back into the ambient air. Upon the next pressurization, they can adsorb nitrogen again and generate oxygen. The entire process is a periodic dynamic cycle, ensuring an uninterrupted oxygen supply.

[0003] For example, the utility model patent application with publication number CN206126843U, entitled "An Oxygen Generator Based on an Integrated Molecular Sieve Tower", published on April 26, 2017, includes an integrated molecular sieve tower comprising a left molecular sieve tower, a right molecular sieve tower, and an oxygen storage chamber. The oxygen generator includes a pre-filter, a compressor, an integrated molecular sieve tower, an oxygen flow regulating device, a humidifier, and an exhaust gas pipeline. The outlet of the pre-filter is connected to the compressor, the outlet of the compressor is connected to the air inlet of the integrated molecular sieve tower, the exhaust gas outlet of the integrated molecular sieve tower is connected to the exhaust gas pipeline, the oxygen outlet of the integrated molecular sieve tower is connected to the oxygen flow regulating device, and the oxygen flow regulating device is connected to the humidifier. In this utility model patent, the cooled compressed air enters the gas distribution valve, which distributes the compressed air to the left and right molecular sieve towers in different time periods for adsorption and separation. Nitrogen is adsorbed, and oxygen enters the oxygen storage chamber. The desorbed nitrogen is discharged through the exhaust outlet of the gas distribution valve. The left and right molecular sieve towers alternately adsorb and separate to complete continuous oxygen production and obtain high concentrations of oxygen.

[0004] For example, the utility model patent application with publication number CN211283723U, entitled "A Three-Tower Oxygen Generation System," published on August 18, 2020, includes an air compressor, an aftercooler, a refrigerated dryer, and three molecular sieve towers. The air compressor, aftercooler, and refrigerated dryer are connected in sequence, and the air compressor is equipped with a filter. Each molecular sieve tower has an inlet end, an outlet end, and an oxygen outlet end. The inlet end of the molecular sieve tower is equipped with a first valve, and the outlet end of the molecular sieve tower is equipped with a second valve. The refrigerated dryer... The first valve is connected to the inlet of each of the three molecular sieve towers; any two molecular sieve towers are connected, and a third valve is installed between any two connected molecular sieve towers. The oxygen outlet of each molecular sieve tower is connected to an oxygen buffer tank, which is connected to an oxygen storage tank. A first oxygen controller and a two-position three-way valve are also installed between the oxygen buffer tank and the oxygen storage tank. The inlet of the two-position three-way valve is connected to the first oxygen controller, one outlet is connected to the oxygen storage tank, and the other outlet is for discharging substandard oxygen. In use, air passes through a filter into an air compressor, which compresses the air. The compressed air is cooled in an aftercooler and then dehydrated in a refrigerated dryer. This cooling process ensures effective dehydration. The dehydrated air then enters the molecular sieve towers through the first valve. The three molecular sieve towers alternately produce oxygen. The oxygen produced by the three molecular sieve towers is buffered in the oxygen buffer tank and finally stored in the oxygen storage tank.

[0005] In existing oxygen generation equipment, two molecular sieve towers are arranged side by side and operate alternately. Gases such as nitrogen within the molecular sieve towers are expelled through pressure regulation. However, after prolonged use, nitrogen and other gases often remain inside the molecular sieve towers. As the amount of nitrogen gradually increases, the oxygen concentration fails to meet standards during oxygen generation. This prevents the equipment from continuously providing sufficient oxygen to patients in the respiratory intensive care unit, necessitating frequent replacement of the adsorbents within the molecular sieve towers to maintain oxygen production efficiency and increasing operating costs. Summary of the Invention

[0006] The purpose of this invention is to provide an oxygen supply device to overcome the aforementioned shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An oxygen supply device includes a device body, within which a pre-filter, an air compressor, a heat exchanger, a solenoid valve, a control circuit, an air adsorption device, an oxygen storage tank, and an oxygen supply mechanism are sequentially connected. The air adsorption device includes an air delivery structure, an oxygen delivery structure, a nitrogen output structure, and at least two molecular sieve towers connected in series. Each molecular sieve tower includes an inlet chamber, an adsorption chamber, and an outlet chamber arranged sequentially. When in operation, the molecular sieve tower has a first working state of adsorbing and supplying oxygen and a second working state of backwashing and discharging nitrogen.

[0009] In the first working state, air flows along the air delivery structure, the air inlet chamber, the adsorption chamber, the air outlet chamber and the oxygen delivery structure to provide oxygen to the oxygen storage tank;

[0010] In the second working state, oxygen can flow in the opposite direction along the oxygen conveying structure, the outlet chamber, the adsorption chamber, the inlet chamber and the nitrogen output structure to discharge nitrogen from the molecular sieve tower.

[0011] It also includes a pressure sensing element and a pressure elasticity sensing element disposed in the air inlet chamber. As the air pressure in the air inlet chamber gradually increases, the pressure sensing element and the pressure elasticity sensing element are triggered in sequence to switch the molecular sieve tower from the first working state to the second working state.

[0012] The oxygen supply device described above includes two sets of molecular sieve towers, each set comprising two molecular sieve towers connected in series.

[0013] In the aforementioned oxygen supply device, the molecular sieve towers are detachably connected in sequence.

[0014] In the aforementioned oxygen supply device, the air delivery structure and the oxygen delivery structure are located inside the molecular sieve tower, and the nitrogen output structure is located outside the molecular sieve tower.

[0015] In the aforementioned oxygen supply device, both the air delivery structure and the nitrogen output structure are connected to the air inlet chamber, and the oxygen delivery structure is connected to the air outlet chamber via an inlet check valve and an outlet check valve.

[0016] The oxygen supply device described above has a drainage structure in the outlet chamber, which is used to drain the oxygen input from the oxygen delivery structure to different positions in the adsorption chamber.

[0017] The oxygen supply device described above includes a circular drainage plate and multiple drainage tubes of different lengths disposed on the circular drainage plate. The circular drainage plate is provided with multiple drainage holes, and the multiple drainage tubes are connected to some of the drainage holes.

[0018] In the aforementioned oxygen supply device, a one-way gas valve is installed inside the drainage pipe, and an air outlet is provided on the outer wall of the drainage pipe. The diameter of the air outlet gradually increases from the air outlet chamber to the air inlet chamber.

[0019] In the aforementioned oxygen supply device, the pressure elastic detection element includes a driving element and a triggering element. When the air pressure in the air intake chamber exceeds the detection threshold of the pressure sensing detection element, the driving element is driven to trigger the triggering element.

[0020] In the aforementioned oxygen supply device, the driving component includes a movable plate and an elastic element. The movable plate divides the air intake chamber into an air intake chamber and a sealed chamber. The air pressure in the sealed chamber is lower than the air pressure in the air intake chamber. The movable plate is movably connected to the side wall of the sealed chamber. The elastic element and the trigger element are both disposed within the sealed chamber and obstruct the movement stroke of the movable plate.

[0021] The oxygen supply device provided by the present invention, as described above, has the following beneficial effects:

[0022] The oxygen supply device provided by this invention includes a pre-filter, an air compressor, a heat exchanger, a solenoid valve, a control circuit, an air adsorption device, an oxygen storage tank, and an oxygen supply mechanism connected in sequence. The air adsorption device includes an air delivery structure, an oxygen delivery structure, a nitrogen output structure, and at least two molecular sieve towers connected in series. The molecular sieve towers have two working states. In the first working state, the molecular sieve towers adsorb, separate, and output oxygen. In the second working state, the oxygen can flow in the opposite direction, thereby quickly discharging the nitrogen in the molecular sieve towers. This improves the oxygen production efficiency of the air adsorption device, ensures the oxygen concentration of the supplied oxygen, increases the service life of the molecular sieve towers, and reduces the operating cost.

[0023] The oxygen supply device provided by this invention has an air pressure sensing element and an air pressure elastic sensing element in the air inlet chamber. As the air pressure in the air inlet chamber gradually increases, the air pressure sensing element and the air pressure elastic sensing element are triggered sequentially to control the molecular sieve tower. The cooperation between the air pressure sensing element and the air pressure elastic sensing element can ensure the safe use of the air adsorption device. Moreover, the air pressure elastic sensing element is a mechanical triggering structure with a long service life and a low probability of failure, which can effectively ensure the stable operation of the air adsorption device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 This is one of the structural schematic diagrams of the oxygen supply device provided in the embodiments of the present invention;

[0026] Figure 2 This is a second schematic diagram of the oxygen supply device provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the air adsorption device provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the molecular sieve tower provided in an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of a drainage structure provided in another embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of a circular drainage plate provided in another embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of a pressure mechanical detection structure provided in another embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of a mechanical triggering structure provided in another embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Device body;

[0035] 1.1 Air compressor; 1.2 Heat exchanger; 1.3 Solenoid valve; 1.4 Oxygen storage tank; 1.5 Oxygen supply mechanism; 1.6 Silencer;

[0036] 2. Air adsorption device;

[0037] 2.1 Air delivery structure; 2.2 Oxygen delivery structure; 2.3 Nitrogen output structure;

[0038] 3. Molecular sieve tower;

[0039] 3.1 Inlet chamber; 3.2 Adsorption chamber; 3.3 Outlet chamber; 3.4 Upper distributor plate; 3.5 Lower distributor plate; 3.6 Molecular sieve; 3.6.1 Zeolite packing layer; 3.7 Spring; 3.8 Pressure sensing detection element;

[0040] 4. Drainage structure;

[0041] 4.1 Circular drainage plate; 4.2 Drainage hole; 4.3 Drainage tube;

[0042] 5. Pneumatic elasticity testing component;

[0043] 5.1 Movable plate; 5.2 Air intake chamber; 5.3 Sealed chamber; 5.4 Elastic element; 5.5 Trigger element;

[0044] 6. Pressure mechanical testing structure;

[0045] 6.1 Oxygen buffer; 6.2 Pressure chamber; 6.3 Sheath; 6.4 Pressure detection chamber;

[0046] 7. Mechanical triggering structure

[0047] 7.1 Trigger chamber; 7.2 First section; 7.3 Connecting section; 7.4 Second section; 7.5 Spring component; 7.6 Seal component; 7.7 Triggering component; 7.8 Liquid sensor. Detailed Implementation

[0048] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0049] like Figure 1-8 As shown, this embodiment of the invention provides an oxygen supply device, including a device body 1. The device body 1 contains, in sequence, a pre-filter, an air compressor 1.1, a heat exchanger 1.2, a solenoid valve 1.3, a control circuit, an air adsorption device 2, an oxygen storage tank 1.4, and an oxygen supply mechanism 1.5. The air adsorption device 2 includes an air conveying structure 2.1, an oxygen conveying structure 2.2, a nitrogen output structure 2.3, and at least two molecular sieve towers 3 connected in series. Each molecular sieve tower 3 includes an inlet chamber 3.1, an adsorption chamber 3.2, and an outlet chamber 3.3 arranged in sequence. The molecular sieve tower 3 has a first working state of adsorbing and supplying oxygen and a second working state of discharging nitrogen. In the first working state… Air flows along the air conveying structure 2.1, the inlet chamber 3.1, the adsorption chamber 3.2, the outlet chamber 3.3, and the oxygen conveying structure 2.2 to supply oxygen to the oxygen storage tank 1.4. In the second working state, oxygen can flow in the opposite direction along the oxygen conveying structure 2.2, the outlet chamber 3.3, the adsorption chamber 3.2, the inlet chamber 3.1, and the nitrogen output structure 2.3 to discharge nitrogen into the molecular sieve tower 3. The system also includes a pressure sensing element 3.8 and a pressure elastic sensing element 5 installed in the inlet chamber 3.1. As the pressure in the inlet chamber 3.1 gradually increases, the pressure sensing element 3.8 and the pressure elastic sensing element 5 are triggered in sequence to switch the molecular sieve tower 3 from the first working state to the second working state.

[0050] Specifically, a pre-filter filters and removes impurities from the air; an air compressor 1.1 compresses the air to form high-concentration compressed air; there can be one or two air compressors 1.1; a heat exchanger cools the compressed air; a solenoid valve 1.3 and a control circuit control and regulate the air delivery line; the control circuit can be a microcontroller or PLC control device; an air adsorption device 2 adsorbs air to deliver oxygen to the next device and adsorbs and discharges nitrogen; an oxygen storage tank 1.4 receives and stores the air delivered by the air adsorption device 2; and an oxygen supply mechanism 1.5 supplies oxygen to the oxygen storage tank 1.4. When oxygen is delivered to a patient in the respiratory intensive care unit, it should be noted that the oxygen supply device in this embodiment includes, but is not limited to, a pre-filter, an air compressor 1.1, a heat exchanger 1.2, a solenoid valve 1.3, a control circuit, an air adsorption device 2, an oxygen storage tank 1.4, and an oxygen supply mechanism 1.5. It may also include structures such as a pressure detector, a moisture separator, and an exhaust silencer 1.6. The pre-filter, air compressor 1.1, heat exchanger 1.2, solenoid valve 1.3, control circuit, air adsorption device 2, oxygen storage tank 1.4, and oxygen supply mechanism 1.5 are all commonly used structures in the prior art and are common knowledge in the field. Their structure and working principle will not be described in detail here. When the oxygen supply device is working, air is filtered through a pre-filter and then delivered to the air compressor 1.1. The air compressor 1.1 compresses the filtered air to form high-concentration compressed air. The compressed air is then delivered to the heat exchanger 1.2 for cooling. The cooled compressed air is then delivered to the solenoid valve 1.3 and then to the air adsorption device 2. The solenoid valve regulates and controls the amount of compressed air delivered. The molecular sieve tower 3 in the air adsorption device 2 adsorbs and separates the air. Nitrogen is adsorbed, and oxygen is delivered to the oxygen storage tank 1.4. The desorbed nitrogen is discharged from the molecular sieve tower 3. In this way, high-concentration oxygen is obtained and stored in the oxygen storage tank 1.4. The oxygen storage tank 1.4 delivers oxygen to the patient through the oxygen supply mechanism 1.5 to provide oxygen therapy.

[0051] In this embodiment, there are at least two molecular sieve towers 3 in the air adsorption device 2, and there can be three or more. Three or more molecular sieve towers 3 can be connected in series to form the air adsorption device 2. Furthermore, the multiple molecular sieve towers 3 can be divided into multiple groups, each group having at least two molecular sieve towers 3 connected in series. Multiple groups can be connected in parallel, so that multiple molecular sieve towers 3 can work at the same time, thereby increasing the oxygen production efficiency. The air conveying structure 2.1, oxygen conveying structure 2.2, and nitrogen conveying structure can be conveying pipes, conveying cylinders, or conveying channels. The air conveying structure 2.1, oxygen conveying structure 2.2, and nitrogen conveying structure can be set inside the molecular sieve towers 3 or outside the molecular sieve towers 3. The air conveying structure 2.1 is used to convey air into each molecular sieve tower 3. Air delivery structure 2.1 is connected to each molecular sieve tower 3, but the control circuit can control the connection or disconnection between air delivery structure 2.1 and each molecular sieve tower 3. Thus, air delivery structure 2.1 can be connected to one, two, or more molecular sieve towers 3 simultaneously, thereby delivering air into the molecular sieve towers 3. At the same time, air delivery structure 2.1 can also be disconnected from all molecular sieve towers 3. Similarly, oxygen delivery structure 2.2 is used to receive oxygen output from each molecular sieve tower 3. Oxygen delivery structure 2.2 can be connected to one, two, or more molecular sieve towers 3 simultaneously, or it can be disconnected from all molecular sieve towers 3. Nitrogen output structure 2.3 is used to output nitrogen adsorbed by each molecular sieve tower 3. Nitrogen output structure 2.3 can be connected to one, two, or more molecular sieve towers 3 simultaneously, or it can be disconnected from all molecular sieve towers 3. Meanwhile, when the molecular sieve tower 3 includes multiple groups arranged in parallel, each group of molecular sieve tower 3 is equipped with an air conveying structure 2.1, an oxygen conveying structure 2.2, and a nitrogen conveying structure, thus realizing separate control and adjustment of each group of molecular sieve tower 3.

[0052] In this embodiment, the molecular sieve tower 3 is sequentially provided with an inlet chamber 3.1, an adsorption chamber 3.2, and an outlet chamber 3.3. The inlet chamber 3.1 is connected to the air conveying structure 2.1 and the nitrogen output structure 2.3, so that the molecular sieve tower 3 can receive air from the air conveying structure 2.1 and output nitrogen from the adsorption chamber 3.2 and the inlet chamber 3.1 through the nitrogen output structure 2.3 under different operating conditions. The adsorption chamber 3.2 is provided with adsorption material or adsorption structure, such as a zeolite packing layer 3.6.1, so that oxygen can be transported through the adsorption chamber 3.2 to the outlet chamber 3.3. Nitrogen cannot pass through the adsorption chamber 3.2 and is adsorbed by the adsorption material or structure within it. The outlet chamber 3.3 is used to transport oxygen to the oxygen transport structure 2.2, and oxygen in the oxygen transport structure 2.2 can also be partially transported to the outlet chamber 3.3. A one-way valve can be installed on the oxygen transport structure 2.2 to control and regulate its connection or closure with the outlet chamber 3.3. Similarly, one-way valves can also be installed on the air transport structure 2.1 and the nitrogen output structure 2.3 to control their connection or closure with the inlet chamber 3.1. The one-way valves can be controlled by a control circuit to open or close. The adsorption chamber 3.2 can have various structures. As a preferred structure, the adsorption chamber 3.2 includes an upper flow divider 3.4, a lower flow divider 3.5, and a molecular sieve 3.6 disposed within the upper flow divider 3.4 and the lower flow divider 3.5. The molecular sieve 3.6 contains zeolite packing. Thus, when air enters the inlet chamber 3.1, it is divided into multiple airflows by the lower flow divider 3.5 and transported to the interior of the molecular sieve 3.6, thereby increasing the adsorption efficiency of the molecular sieve 3.6. Similarly, when oxygen enters the outlet chamber 3.3, it is divided into multiple airflows by the upper flow divider 3.4 and transported to the molecular sieve. The internal structure of 3.6 increases the backwashing effect of oxygen on molecular sieve 3.6. A spring 3.7 is also installed on the upper distribution plate 3.4. Molecular sieve 3.6 is prone to peristalsis and even pulverization when adsorbing nitrogen. The spring 3.7 ensures that the molecular sieve 3.6 between the upper distribution plate 3.4 and the lower distribution plate 3.5 is always in a relatively compressed state, reducing peristalsis and pulverization. This reduces the wear and tear on molecular sieve 3.6, extends its service life, and also reduces the amount of dust in the produced oxygen, thereby improving the purity of the oxygen.

[0053] In this embodiment, when the oxygen supply device is working, the molecular sieve tower 3 has a first working state and a second working state. In the first working state, the molecular sieve tower 3 is used to adsorb compressed air. The air conveying structure 2.1 conveys compressed air into the air inlet chamber 3.1, the adsorption chamber 3.2 adsorbs nitrogen in the air, and oxygen is conveyed to the air outlet chamber 3.3, and then continues to be conveyed to the storage tank through the oxygen conveying structure 2.2. In the second working state, the molecular sieve tower 3 is used to discharge the nitrogen inside. In this working state, the oxygen conveying structure 2.2 is connected to the air outlet chamber 3.3, and part of the oxygen in the oxygen conveying structure 2.2 is... The oxygen is delivered to the outlet chamber 3.3. Inside the molecular sieve tower 3, oxygen flows along the direction of the outlet chamber 3.3, the adsorption chamber 3.2, and the inlet chamber 3.1, and is finally output from the nitrogen output structure 2.3. In the second working state, the flow direction of oxygen is opposite to that of air in the first working state. Thus, in the second working state, under the action of oxygen flow, nitrogen can be driven to move quickly from the adsorption chamber 3.2 to the outlet chamber 3.3 and finally output from the nitrogen output structure 2.3. This improves the efficiency and speed of nitrogen discharge from the molecular sieve tower 3 and effectively avoids nitrogen residue in the molecular sieve tower 3, which would affect the adsorption effect of the molecular sieve tower 3. In this embodiment, the molecular sieve tower 3 includes at least two molecular sieve towers 3 connected in series. When the oxygen supply device is working, at least one molecular sieve tower 3 is in a first working state and at least one molecular sieve tower 3 is in a second working state. When there are multiple molecular sieve towers 3, two or more molecular sieve towers 3 can be in the first working state or the second working state simultaneously. During operation, the molecular sieve tower 3 switches from the first working state to the second working state according to a preset environment, or it can switch from the second working state to the first working state according to a preset environment. When the molecular sieve tower 3 is in the first working state, as the nitrogen in the adsorption chamber 3.2 gradually increases, the air adsorption and separation efficiency gradually decreases. At this time, the molecular sieve tower 3 switches from the first working state to the second working state. In the second working state, when the nitrogen in the adsorption chamber 3.2 is gradually discharged to the preset condition, the molecular sieve tower 3 switches from the second working state to the first working state. This cycle repeats, thereby continuously supplying oxygen to the oxygen storage tank 1.4. The switching of the molecular sieve tower 3 between the first working state and the second working state is controlled and regulated by the control circuit.

[0054] In this embodiment, both the pressure sensing element 3.8 and the pressure elastic sensing element 5 are disposed inside the air inlet chamber 3.1 to detect the air pressure inside the air inlet chamber 3.1. When the molecular sieve tower 3 is in the first working state and the adsorption chamber 3.2 is working normally, the air supplied to the air inlet chamber 3.1 and the oxygen output from the air outlet chamber 3.3 are kept in a balanced state. Thus, the air pressure inside the air inlet chamber 3.1 is kept within a suitable range. As the adsorption chamber 3.2 gradually adsorbs air, the nitrogen in the adsorption chamber 3.2 gradually increases, and the adsorption and filtration effect on the air gradually weakens. Thus, when the air is supplied... The airflow rate of compressed air supplied to the inlet chamber 3.1 remains constant. As the amount of air and nitrogen in the inlet chamber 3.1 gradually increases, the air pressure in the inlet chamber 3.1 gradually increases. At this time, the adsorption and filtration effect of the molecular sieve tower 3 is poor, and it is necessary to switch from the first working state to the second working state. Both the gas sensor and the pressure elastic detection element 5 can detect the air pressure in the inlet chamber 3.1, thereby sending a control signal to the control circuit. This causes the control circuit to control the molecular sieve tower 3 to switch from the first working state to the second working state. As the air pressure gradually increases, the pressure sensor 3.8 is first triggered. The air pressure sensor 3.8 is activated when a control signal is sent to the control circuit. If the air pressure exceeds a preset value and the air pressure sensor 3.8 is not triggered (i.e., the air pressure sensor 3.8 is faulty or damaged), the air pressure elastic sensor 5 is triggered, sending a control signal to the control circuit. For example, if the air pressure control range in the intake chamber 3.1 is P1 to P2, and the detection value of the air pressure sensor 3.8 is P3 (P3 is greater than P2), then when the air pressure sensor 3.8 detects that the air pressure in the intake chamber 3.1 exceeds P3, it sends a control signal. The detection value of the air pressure elastic sensor 5 is P4 (P4 is greater than P3), and when the air pressure exceeds P3, the air pressure elastic sensor 5 is triggered, sending a control signal to the control circuit. When the air pressure in chamber 3.1 reaches P4, the pressure elastic detection element 5 is triggered, thereby sending a control signal. Since P4 is greater than P3, when the pressure sensing detection element 3.8 is working normally, the air pressure in the intake chamber 3.1 will not exceed P4. When the air pressure in the intake chamber 3.1 reaches P4, it indicates that the pressure sensing detection element 3.8 has malfunctioned or been damaged. The pressure elastic detection element 5 then becomes a backup trigger. The pressure sensing detection element 3.8 can be a pressure sensor, while the pressure elastic detection element 5 is a mechanical triggering structure with a low probability of failure, thus ensuring the safety of the molecular sieve tower 3.

[0055] The oxygen supply device provided in this embodiment of the invention includes a pre-filter, an air compressor 1.1, a heat exchanger 1.2, a solenoid valve 1.3, a control circuit, an air adsorption device 2, an oxygen storage tank 1.4, and an oxygen supply mechanism 1.5 connected in sequence. The air adsorption device 2 includes an air conveying structure 2.1, an oxygen conveying structure 2.2, a nitrogen output structure 2.3, and at least two molecular sieve towers 3 connected in series. The molecular sieve towers 3 have two working states. In the first working state, the molecular sieve towers 3 adsorb and separate oxygen. In the second working state, the oxygen can flow in the opposite direction to quickly discharge the nitrogen in the molecular sieve towers 3. This improves the oxygen production efficiency of the air adsorption device 2, ensures the oxygen concentration of the supplied oxygen, increases the service life of the molecular sieve towers 3, and reduces the operating cost.

[0056] The oxygen supply device provided in this embodiment of the invention has an air pressure sensing element 3.8 and an air pressure elastic sensing element 5 installed in the air inlet chamber 3.1. As the air pressure in the air inlet chamber 3.1 gradually increases, the air pressure sensing element 3.8 and the air pressure elastic sensing element 5 are triggered sequentially to control the molecular sieve tower 3. The cooperation between the air pressure sensing element 3.8 and the air pressure elastic sensing element 5 can ensure the safe use of the air adsorption device 2. Moreover, the air pressure elastic sensing element 5 is a mechanical triggering structure with a long service life and a low probability of failure, which can effectively ensure the stable operation of the air adsorption device 2.

[0057] In the embodiments provided by the present invention, preferably, there are two sets of molecular sieve towers 3, each set including two molecular sieve towers 3 connected in series; each set of molecular sieve towers 3 is independently provided with an air delivery structure 2.1, an oxygen delivery structure 2.2, and a nitrogen output structure 2.3. Both air delivery structures 2.1 are connected to a solenoid valve 1.3 to receive the delivered compressed air, and both oxygen delivery structures 2.2 are connected to an oxygen storage tank 1.4. When the oxygen supply device is working, one of the molecular sieve towers 3 in each set is in a first working state and the other is in a second working state. This ensures that there are always two molecular sieve towers 3 in the air adsorption device 2 adsorbing air to deliver oxygen to the oxygen storage tank 1.4. Furthermore, since the other two molecular sieve towers 3 can quickly discharge nitrogen through the reverse flow of oxygen, the oxygen preparation efficiency can be effectively improved. At the same time, when one set of molecular sieve towers 3 malfunctions, the other set of molecular sieve towers 3 can continue to work, thereby meeting the requirements for use under special circumstances.

[0058] In the embodiments provided by the present invention, preferably, the molecular sieve towers 3 are detachably connected sequentially; the molecular sieve towers 3 can be detachably connected to each other through connecting components, such as connecting plates, connecting sleeves, or connecting cylinders. A first connecting member can be provided at one end of the molecular sieve tower 3, which can be a connecting groove or a connecting outer sleeve, and a second connecting member can be provided at the other end of the molecular sieve tower 3, which can be a connecting ring or a connecting inner sleeve. The first connecting member and the second connecting member are correspondingly provided, so that the first connecting member of one molecular sieve tower 3 is connected to the second connecting member of another molecular sieve tower 3 to achieve a fixed connection between the two molecular sieve towers 3. In this way, multiple molecular sieve towers 3 can be connected in series to form an air adsorption device 2.

[0059] In the embodiments provided by the present invention, preferably, the air delivery structure 2.1 and the oxygen delivery structure 2.2 are disposed inside the molecular sieve tower 3, and the nitrogen output structure 2.3 is disposed outside the molecular sieve tower 3; the air delivery structure 2.1 and the oxygen delivery structure 2.2 are respectively an air delivery pipe and an oxygen delivery pipe, which are disposed at the center of each molecular sieve tower 3. The air delivery pipes in each molecular sieve tower 3 are interconnected, and the oxygen delivery pipes in each molecular sieve tower 3 are also interconnected. Each molecular sieve tower 3 can also share an integrated air delivery pipe and an oxygen delivery pipe. The nitrogen output structure 2.3 can be a nitrogen output pipe disposed outside the molecular sieve tower 3, or it can be a cylinder surrounding the molecular sieve tower 3, with the cylinder sleeved outside each molecular sieve tower 3, forming a nitrogen output structure 2.3 between the cylinder and each molecular sieve tower 3.

[0060] In the embodiments provided by the present invention, preferably, both the air delivery structure 2.1 and the nitrogen output structure 2.3 are connected to the inlet chamber 3.1, and the oxygen delivery structure 2.2 is connected to the outlet chamber 3.3 via an inlet check valve and an outlet check valve. The air delivery structure 2.1 and the nitrogen output structure 2.3 are provided with connecting portions that communicate with the inlet chamber 3.1, and each connecting portion is equipped with an opening valve that can be opened or closed. The opening valve is controlled by a control circuit to open or close, thus enabling the air delivery structure 2.1 and the nitrogen output structure 2.3 to be connected to the inlet chamber 3.1 of different molecular sieve towers 3, and the oxygen delivery structure 2.2 to communicate with the inlet chamber 3.1. Both the one-way valve and the outlet one-way valve can be controlled by the control circuit to open or close. The inlet one-way valve delivers oxygen from the outlet chamber 3.3 to the oxygen delivery structure 2.2, while the outlet one-way valve delivers oxygen from the oxygen delivery structure 2.2 to the outlet chamber 3.3. The oxygen delivery flow rate of the outlet one-way valve is much smaller than that of the inlet one-way valve. This allows a small portion of the oxygen in the oxygen delivery structure 2.2 to flow through the outlet one-way valve to the outlet chamber 3.3 of the molecular sieve tower 3 in the second working state, thereby discharging nitrogen from the molecular sieve tower 3. Most of the oxygen is still delivered to the oxygen storage tank 1.4.

[0061] In another embodiment of the present invention, preferably, a drainage structure 4 is provided in the outlet chamber 3.3, which is used to drain oxygen input from the oxygen delivery structure 2.2 to different positions in the adsorption chamber 3.2; the drainage structure 4 includes a circular drainage plate 4.1 and a plurality of drainage tubes 4.3 of different lengths disposed on the circular drainage plate 4.1. The circular drainage plate 4.1 is disposed in the outlet chamber 3.3. The circular drainage plate 4.1 can be an upper diversion plate 3.4 or a separate circular plate. The drainage tubes 4.3 are inserted into the zeolite packing inside the adsorption chamber 3.2. The circular guide plate 4.1 is provided with multiple guide holes 4.2, and multiple guide pipes 4.3 are connected to some of the guide holes 4.2. The multiple guide holes 4.2 are equally spaced on the circular guide plate 4.1. The multiple guide holes 4.2 allow oxygen to be transported from the adsorption chamber 3.2 to the outlet chamber 3.3 through the guide holes 4.2, and oxygen can also be transported from the outlet chamber 3.3 to the adsorption chamber 3.2 through the guide holes 4.2. At the same time, oxygen can also be transported from the guide holes 4.2 to the interior of each guide pipe 4.3, thus enabling it to be transported to different positions within the zeolite packing layer 3.6.1. In actual use, since the zeolite packing layer 3.6.1 in the adsorption chamber 3.2 has a certain thickness and is filled with nitrogen, at the beginning of the second working state of the molecular sieve tower 3, the oxygen flows slowly to the zeolite packing layer 3.6.1 through the circular guide plate 4.1 or the upper distribution plate 3.4. At this time, some oxygen is transported to different positions of each zeolite packing layer 3.6.1 through the guide pipe 4.3. The oxygen flow can carry away the nitrogen in different positions in the zeolite packing layer 3.6.1, thus accelerating the efficiency of nitrogen discharge in the molecular sieve tower 3.

[0062] In another embodiment of the present invention, a gas check valve is further provided inside the drainage tube 4.3, and an air outlet is provided on the outer wall of the drainage tube 4.3. The diameter of the air outlet gradually increases from the air outlet chamber 3.3 to the air inlet chamber 3.1. The guide pipe 4.3 is a pipe body sealed at one end and open at the other. The open end of the guide pipe 4.3 is connected to the guide hole 4.2. A gas one-way valve is installed at the open end of the guide pipe 4.3. The gas one-way valve ensures that oxygen can only be delivered from the outlet chamber 3.3 to the guide pipe 4.3, but not from the guide pipe 4.3 into the outlet chamber 3.3. This effectively prevents air or nitrogen from being delivered from the guide pipe 4.3 into the outlet chamber 3.3 in the first working state of the molecular sieve tower 3, thereby reducing the oxygen concentration. The outlet hole is located on the side wall of the guide pipe 4.3 and is connected to the gas delivery channel inside the guide pipe 4.3. Thus, after oxygen is delivered into the guide pipe 4.3, it can be delivered to the zeolite packing layer 3 through the outlet hole. In section 6.1, only a small portion of the drainage holes 4.2 are connected to drainage pipes 4.3, while most drainage holes 4.2 are not connected to drainage pipes 4.3. Thus, at the beginning of the second working state of the molecular sieve tower 3, most of the oxygen can be output from the outlet at the end of the drainage pipe 4.3. As the nitrogen in the zeolite packing layer 3.6.1 is gradually discharged, oxygen is transported to the zeolite packing layer 3.6.1 through both drainage holes 4.2 and drainage pipes 4.3. At the end of the second working state of the molecular sieve tower 3, most of the oxygen is transported to the zeolite packing layer 3.6.1 through drainage holes 4.2. In this way, oxygen can be evenly transported into the packing layer throughout the entire process, accelerating the nitrogen discharge efficiency in the molecular sieve tower 3.

[0063] In another embodiment of the present invention, preferably, the air pressure elasticity detection element includes a driving element and a trigger element 5.5. When the air pressure in the intake chamber 3.1 exceeds the detection threshold of the air pressure sensing detection element 3.8, the driving element is driven to trigger the trigger element 5.5. The driving element includes a movable plate 5.1 and an elastic element 5.4. The movable plate 5.1 divides the intake chamber 3.1 into an intake chamber 5.2 and a sealed chamber 5.3. The movable plate 5.1 is slidably connected to the side wall of the sealed chamber 5.3. The air pressure in the sealed chamber 5.3 is less than the air pressure in the intake chamber 5.2. The first elastic element 5.4 and the trigger element 5.5 are both disposed in the sealed chamber 5.3 and block the movement stroke of the movable plate 5.1. The movable plate 5.1 can be transversely disposed in the intake chamber 5.5. The air chamber 3.1 is divided into upper and lower chambers, namely the air intake chamber 5.2 and the sealed chamber 5.3. An opening can also be provided on the side wall at the bottom of the air intake chamber 3.1. The movable plate 5.1 is slidably connected to the opening of the opening to form a sealed chamber 5.3. At this time, the air intake chamber 5.2 is the entire air intake chamber 3.1. The side walls of the movable plate 5.1 and the sealed chamber 5.3 are tightly connected. The movable plate 5.1 and the sealed chamber 5.3 can be sealed by a dynamic sealing structure. This ensures that the movable plate 5.1 maintains a seal on the sealed chamber 5.3 during its movement. The dynamic sealing structure is a commonly used structure in the prior art and will not be described in detail here. Both the trigger element 5.5 and the elastic element 5.4 are disposed within the sealed chamber 5.3. The two ends of the elastic element 5.4 can be fixed to the bottom of the sealed chamber 5.3 and the movable plate 5.1, respectively. Alternatively, only one end of the elastic element 5.4 can be fixed to the bottom of the sealed chamber 5.3, while the other end obstructs the movement of the movable plate 5.1 along the sealed chamber 5.3. The trigger element 5.5 can be a limit switch or a trigger-type switch. When the air pressure in the intake chamber 5.2 gradually increases, while the air pressure in the sealed chamber 5.3 remains constant, and the air pressure in the intake chamber 5.2 is greater than that in the sealed chamber 5.3. The air pressure inside chamber 3 causes the movable plate 5.1 to move along the sealed chamber 5.3 and press against the elastic element 5.4. The elastic element 5.4, when pressed, has elasticity, thereby balancing the pressure difference between the air inlet chamber 5.2 and the sealed chamber 5.3. As the pressure difference gradually increases, when the movable plate 5.1 moves to the preset position, it will trigger the trigger element 5.5. The trigger element 5.5 sends a control signal to the control circuit to control the molecular sieve tower 3 to switch from the first working state to the second working state. The trigger element 5.5 can also directly send a control signal to the solenoid valve 1.3 to control the operation of the molecular sieve tower 3.

[0064] In another embodiment of the present invention, preferably, the oxygen supply device further includes a pressure mechanical detection structure 6, which is disposed between the oxygen storage tank 1.4 and the oxygen supply mechanism 1.5, for detecting the pressure of the delivered oxygen; the pressure mechanical detection structure 6 includes a pressure chamber 6.2, a pressure detection chamber 6.4 surrounding the outside of the pressure chamber 6.2, and a mechanical triggering structure 7. The pressure detection chamber 6.4 is filled with liquid, and when the pressure in the pressure chamber 6.2 gradually increases, the liquid can drive and trigger the mechanical triggering structure 7. An oxygen buffer 6.1 is installed before the oxygen storage and supply mechanism 1.5. A pressure chamber 6.2 is formed inside the oxygen buffer 6.1, which is connected to both the oxygen storage tank 1.4 and the oxygen supply mechanism 1.5. The sidewall of the pressure chamber 6.2 is made of a highly elastic material, allowing it to expand outwards when the pressure inside increases. A sleeve 6.3 is fitted over the oxygen buffer 6.1, forming a sealed connection. A pressure detection chamber 6.4 is formed between the sleeve 6.3 and the oxygen buffer 6.1, filled with liquid. An opening is provided on the sleeve 6.3, and a mechanical triggering structure 7 is located at the opening. When the pressure inside the pressure chamber 6.2 gradually increases, it presses against the liquid, causing the liquid to exit from the opening, thus triggering the mechanical triggering structure 7. This indicates that the pressure inside the pressure chamber 6.2 exceeds a preset value, indicating an abnormality in oxygen supply. The mechanical triggering structure 7 then issues a control signal or an alarm signal.

[0065] In another embodiment of the present invention, preferably, the mechanical triggering structure 7 includes a cylindrical body connected to the opening of the pressure detection chamber 6.4. A triggering chamber 7.1 is disposed within the cylindrical body. The triggering chamber 7.1 includes a first segment 7.2, a connecting segment 7.3, and a second segment 7.4 connected together. The first segment 7.2 is connected to the opening of the pressure detection chamber 6.4, and the radial dimension of the first segment 7.2 is smaller than the radial dimension of the second segment 7.4. A spring 7.5 and a sealing element 7.6 are disposed inside the second end. The sealing element 7.6 is connected to the bottom wall of the second segment 7.4 via the spring 7.5. The sealing element 7.6 has an arc-shaped sealing portion corresponding to the connecting segment 7.3. A triggering component 7.7 and a liquid sensor 7.8 are disposed within the second segment 7.4. Thus, under normal conditions, i.e., when the pressure in the pressure chamber 6.2 is normal, the pressure detection chamber 6.4 is filled with liquid. The sealing element 7.6 seals the first segment 7.2 under the action of the spring 7.5, while the pressure is at a suitable level. Within the specified range, pressure chamber 6.2 presses against the liquid, preventing it from flowing into trigger chamber 7.1. As the air pressure in pressure chamber 6.2 gradually increases, it presses against the liquid, which then gradually presses against the seal 7.6 from the opening. When the air pressure in pressure chamber 6.2 exceeds a preset value, the liquid in pressure detection chamber 6.4 is transported from the opening to trigger chamber 7.1. Liquid sensor 7.8 detects the liquid and sends a control signal or alarm. If liquid sensor 7.8 malfunctions, the pressure of the liquid can push the arc-shaped seal to move within the connection end. When the arc-shaped seal reaches the preset value, seal 7.6 triggers trigger component 7.7 to send a control signal or alarm. The trigger can be a limit switch or a trigger switch. To facilitate multiple uses of the mechanical trigger structure 7, trigger chamber 7.1 is sealed with a movable plug. After the mechanical trigger structure 7 is triggered, the movable plug can be removed to open trigger chamber 7.1, allowing the mechanical trigger structure 7 to be used again after manual maintenance.

[0066] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An oxygen supply device, comprising a device body, wherein a pre-filter, an air compressor, a heat exchanger, a solenoid valve, a control circuit, an air adsorption device, an oxygen storage tank, and an oxygen supply mechanism are sequentially connected and disposed within the device body, characterized in that, The air adsorption device includes an air conveying structure, an oxygen conveying structure, a nitrogen output structure, and at least two molecular sieve towers connected in series. Each molecular sieve tower includes an inlet chamber, an adsorption chamber, and an outlet chamber arranged in sequence. When in operation, the molecular sieve tower has a first working state of adsorbing and supplying oxygen and a second working state of backwashing and discharging nitrogen. In the first working state, air flows along the air delivery structure, the air inlet chamber, the adsorption chamber, the air outlet chamber and the oxygen delivery structure to provide oxygen to the oxygen storage tank; In the second working state, oxygen flows in the opposite direction along the oxygen conveying structure, the outlet chamber, the adsorption chamber, the inlet chamber and the nitrogen output structure to discharge nitrogen from the molecular sieve tower. It also includes a pressure sensing element and a pressure elasticity sensing element disposed in the air inlet chamber. As the air pressure in the air inlet chamber gradually increases, the pressure sensing element and the pressure elasticity sensing element are triggered in sequence to switch the molecular sieve tower from the first working state to the second working state. The pneumatic elastic detection element includes a driving element and a triggering element. When the air pressure in the air intake chamber exceeds the detection threshold of the pneumatic sensing detection element, the driving element is driven to trigger the triggering element. The driving component includes a movable plate and an elastic element. The movable plate divides the air intake chamber into an air intake chamber and a sealed chamber. The air pressure in the sealed chamber is lower than that in the air intake chamber. The movable plate is movably connected to the side wall of the sealed chamber. The elastic element and the trigger element are both disposed in the sealed chamber and obstruct the movement stroke of the movable plate.

2. The oxygen supply device according to claim 1, characterized in that, The molecular sieve towers are in two groups, each group consisting of two molecular sieve towers connected in series.

3. The oxygen supply device according to claim 1, characterized in that, The molecular sieve towers are detachably connected in sequence.

4. The oxygen supply device according to claim 1, characterized in that, The air delivery structure and the oxygen delivery structure are located inside the molecular sieve tower, and the nitrogen output structure is located outside the molecular sieve tower.

5. The oxygen supply device according to claim 1, characterized in that, The air delivery structure and the nitrogen output structure are both connected to the air inlet chamber, and the oxygen delivery structure is connected to the air outlet chamber through an air inlet check valve and an air outlet check valve.

6. The oxygen supply device according to claim 1, characterized in that, The outlet chamber is equipped with a drainage structure, which is used to drain the oxygen input from the oxygen delivery structure to different positions in the adsorption chamber.

7. The oxygen supply device according to claim 6, characterized in that, The drainage structure includes a circular drainage plate and multiple drainage tubes of different lengths disposed on the circular drainage plate. The circular drainage plate is provided with multiple drainage holes, and the multiple drainage tubes are connected to some of the drainage holes.

8. The oxygen supply device according to claim 7, characterized in that, A one-way gas valve is installed inside the drainage tube, and an air outlet is provided on the outer wall of the drainage tube. The diameter of the air outlet gradually increases from the air outlet chamber to the air inlet chamber.

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