A molecular sieve gas path control device and oxygen generator

Abstract

A molecular sieve gas circuit control device includes an end cover, a gas circuit body, and a control valve assembly. The end cover is provided with an air inlet connector connected to a high-pressure gas source. The end cover is sealed and connected to the gas circuit body. The control valve assembly is arranged in the gas circuit body. The gas circuit body is provided with an air inlet cavity and an exhaust cavity. The air inlet cavity is respectively connected to the air inlet connector and the molecular sieve tower, and the exhaust cavity is respectively connected to the exhaust hole and the molecular sieve tower. The control valve assembly controls the opening and closing of the air inlet cavity and the exhaust cavity. The molecular sieve gas circuit control device of the present invention utilizes the air inlet cavity and the exhaust cavity of the end cover and the gas circuit body to form two silencer cavities, eliminates the instability of the air flow, and effectively eliminates the noise of the air inlet and exhaust. At the same time, the gas circuit body is used to integrate various components into one, without the need for external connectors, effectively reducing the number of connectors, reducing the risk of air leakage, and simplifying maintenance. At the same time, the gas circuit structure has good packaging and compact structure.

Description

Technical Field

[0001] The invention belongs to the technical field of oxygen production equipment, and in particular relates to a molecular sieve gas path control device and an oxygen generator. Background Art

[0002] The molecular sieve oxygen concentrator uses the working principle of pressure swing adsorption to separate more than 90% of oxygen from the air. It only needs electricity and no other consumables. The technology is becoming more and more mature and is widely used in industrial, hospital and household oxygen supply. Oxygen therapy, as an important medical method, is used to correct hypoxemia, relieve cardiopulmonary symptoms such as dyspnea, and has significant effects and a long history of application. With the continuous popularization of small household molecular sieve oxygen concentrators, household oxygen therapy has been widely promoted and used. International and national standards related to small household molecular sieve oxygen concentrators have also been introduced to guide product development and industry supervision. International or domestic medical guidelines and expert recommendations related to household oxygen therapy have also been gradually formulated and introduced to guide practitioners to provide standardized household oxygen therapy services. Ensuring the safety and effectiveness of oxygen therapy objectively requires small household molecular sieve oxygen concentrators to develop in a standardized and professional direction. In short, the top priority is: long-term stable oxygen concentration, long-term reliable operation, low noise, and good user experience.

[0003] At present, small household molecular sieve oxygen concentrators generally have the following problems: 1. The oxygen production process is relatively complicated, the gas circuit control structure is complex, there are many pipe connections, solenoid valves are used frequently, there are many parts, the space is tight and it is difficult to layout, the modularization and standardization are low, maintenance is difficult, the failure rate is high, the installation process is complex, the production efficiency is low, and the production cost is high. 2. Due to the complex gas circuit control, the noise generated during the alternating reciprocating process of the solenoid valve and the molecular sieve tower is the main source of the noise of the whole machine, and noise control has also become a difficult issue to effectively control.

[0004] After reviewing the existing patent documents, it was found that some inventors have tried to solve the above two problems. This patent application specially selects two typical documents as patent comparison.

[0005] Cited patent application document 1: Chinese invention patent application, publication number: CN110605000A, discloses an oxygen generator adsorption tower upper cover and an air intake and nitrogen exhaust system, which utilizes an oxygen generator adsorption tower upper cover and an air intake and nitrogen exhaust system and an oxygen generator, and the top of the cover plate of the adsorption tower upper cover is provided with an air inlet nozzle, a four-position six-way solenoid valve, a pressure regulating valve and an oxygen outlet nozzle; the four-position six-way solenoid valve is an inseparable whole, a pair of air inlet interfaces of the four-position six-way solenoid valve are sealed and connected together in an air inlet bin, the valve body of the pressure regulating valve and the cover plate are integrally cast as a whole, the inlet of the pressure regulating valve is sealed and connected to the connecting port of the high-pressure oxygen bin, and the outlet end is connected to the oxygen outlet nozzle through the oxygen output channel built into the cover plate.

[0006] Reference patent application document 2: Chinese utility model patent, announcement number CN209968030U discloses a molecular sieve tower, which is used to solve the technical problem that the gas circuit connection of the existing oxygen generator is too complicated; wherein the molecular sieve tower includes: an upper cover, a first molecular sieve chamber, a gas collecting chamber, a second molecular sieve chamber and a lower cover; the inner cavity of the upper cover body is divided into: a first cover chamber, a second cover chamber, a third cover chamber, a first airway, a second airway and a third airway; the first airway and the third airway are connected to the second airway through a one-way valve respectively; a separate backwashing airway is provided between the first airway and the third airway; the backwashing airway is provided with a solenoid valve required for opening and closing the backwashing airway; the first cover chamber is used to buckle and seal the first molecular sieve chamber; the second cover chamber is used to buckle and seal the gas collecting chamber; the third cover chamber is used to buckle and seal the second molecular sieve chamber; the lower end of the lower cover is provided with a connector. During the maintenance operation, the molecular sieve tower can be replaced by directly pulling and plugging, without the need to reconnect the hose, and the operation is extremely convenient.

[0007] In the solutions of the above two documents, the molecular sieve gas path control device is composed of a molecular sieve tower and a separate bypass solenoid valve, a four-position six-way valve, an inlet and outlet duct, and an exhaust muffler. They have the following problems: 1. Four-position six-way valves are generally small in size, with a small flow channel structure for built-in gas flow. The intersection nodes are generally narrow. When the valve is opened and closed, high-pressure air flows through, which will produce a large gas path explosion. The original noise is large, and the noise is transmitted along the valve body, pipeline, molecular sieve tower, etc. Due to the internal structure limitations of the source, noise control is difficult and the effect is poor;

[0008] 2. The design of the cover cavity has many components, low integration, many gas circuits, many joints, high risk of leakage, more failure points, poor maintainability and increased difficulty in maintenance; 3. The noise factor affects the patient's experience and reduces the patient's compliance with oxygen therapy. Summary of the invention

[0009] The purpose of the present invention is to overcome the problems existing in the prior art and to provide a molecular sieve gas path control device and an oxygen generator with high integration and low noise.

[0010] The technical solution of the present invention is as follows:

[0011] A molecular sieve gas circuit control device comprises an end cover, a gas circuit body and a control valve assembly, wherein the end cover is provided with an air inlet connector connected to a high-pressure gas source, the end cover is sealed and connected to the gas circuit body, the control valve assembly is arranged in the gas circuit body, an air inlet cavity and an exhaust cavity are arranged in the gas circuit body, the air inlet cavity is respectively connected to the air inlet connector and a molecular sieve tower, the exhaust cavity is respectively connected to an exhaust hole and a molecular sieve tower, and the control valve assembly controls the opening and closing of the air inlet cavity and the exhaust cavity.

[0012] The exhaust cavity surrounds the intake cavity, and the control valve assembly is respectively arranged in the intake cavity and the exhaust cavity.

[0013] The end cover comprises a second cover body and a first cover body, the first cover body is sealed and connected to the air intake cavity, the second cover body is sealed and connected to the air exhaust cavity, and the air intake joint is arranged on the first cover body.

[0014] The control valve assembly includes a solenoid valve controller, a control valve core, a valve body, and a control valve kinematic pair. The valve body is provided with at least two air paths, at least one of which is located in the air intake cavity, and at least one of which is located in the exhaust cavity. The control valve core is arranged in the valve body, and the air path of the control valve core corresponds to the air path of the valve body. The control valve kinematic pair is arranged in the control valve core. The solenoid valve controller drives the control valve kinematic pair to move, opens or closes the air path to connect the air intake cavity and the molecular sieve tower, and opens or closes the air path to connect the exhaust cavity and the molecular sieve tower.

[0015] The gas path channel is configured as annular gaps, and the annular gaps are fixedly connected by support blocks.

[0016] The control valve moving pair comprises a first diaphragm, a second diaphragm and a connecting column, and the effective gas contact area of ​​the second diaphragm is smaller than that of the first diaphragm.

[0017] A first protrusion is provided on the inner side of the first diaphragm, and a second protrusion is provided on the inner side of the second diaphragm. The first protrusion and the second protrusion are fixedly connected via a connecting column. When the first diaphragm and the second diaphragm are subjected to force at the same time, the first protrusion moves axially to drive the connecting column and the second protrusion to move. When the first diaphragm is not subjected to force, the first diaphragm returns to its original position and rebounds, driving the first protrusion and the second protrusion to return to their original position.

[0018] The second diaphragm is provided with an air inlet notch along the circumferential direction.

[0019] The control valve core includes at least two air paths and a valve core seat. The valve core seat is provided with an air inlet hole connected to the molecular sieve tower. The air paths are located on both sides of the valve core seat. The control valve motion pair is provided in the control valve core and is fixedly connected to the control valve core. The first protrusion and the second protrusion are located on both sides of the valve core seat. The connecting column is located in the middle of the valve core seat and forms a transition cavity with the inner wall of the valve core seat. When the first diaphragm is subjected to force, the first protrusion fits tightly with one side of the valve core seat, and there is a gap between the second protrusion and the other side of the valve core seat, connecting the air inlet cavity, the transition cavity and the molecular sieve tower. When the first diaphragm is reset, a gap is provided between the first protrusion and one side of the valve core seat, and the second protrusion fits tightly with one side of the valve core seat. The molecular sieve tower, the transition cavity and the exhaust cavity are connected.

[0020] The solenoid valve controller includes a bypass solenoid valve and an air circuit control component. The bypass solenoid valve controls the opening and closing of the air circuit control component. The air circuit control component is provided with three ports. The first end is connected to the first diaphragm through the air circuit connector, the second end is connected to the air intake cavity, and the third end is connected to the outside atmosphere. The air circuit connector is provided in the control valve core. The air circuit control component opens the first port and the second port, and introduces high-pressure gas into the air circuit connector to drive the first diaphragm to deform under force, thereby opening the air intake channel. When the bypass solenoid valve is opened, the air circuit control component opens the third port, closes the second port, the first diaphragm is reset, and the exhaust channel is opened.

[0021] At least two molecular sieve towers are provided, and a molecular sieve gas path control device is provided corresponding to each molecular sieve tower, and each molecular sieve gas path control device is respectively connected to its corresponding molecular sieve tower.

[0022] The air inlet connectors are provided with two and are arranged on an end cover. The air inlet cavity is provided with one and is respectively connected to the two molecular sieve towers. The exhaust cavity is provided with one and is respectively connected to the two molecular sieve towers. Two valve bodies and valve cores are provided to respectively control the two molecular sieve towers to be connected to the air inlet cavity and to respectively control the two molecular sieve towers to be connected to the exhaust cavity.

[0023] An oxygen generator comprises a molecular sieve gas path control device, a molecular sieve tower and an oxygen storage device. One end of the molecular sieve tower is connected to the oxygen storage device to transmit oxygen into the oxygen storage device. The oxygen connector is arranged on the oxygen storage device.

[0024] Beneficial effects:

[0025] A molecular sieve gas circuit control device comprises an end cover, a gas circuit body and a control valve assembly, wherein the end cover is provided with an air inlet connector connected to a high-pressure gas source, the end cover is sealed and connected to the gas circuit body, the control valve assembly is arranged in the gas circuit body, an air inlet cavity and an exhaust cavity are arranged in the gas circuit body, the air inlet cavity is respectively connected to the air inlet connector and a molecular sieve tower, the exhaust cavity is respectively connected to an exhaust hole and a molecular sieve tower, and the control valve assembly controls the opening and closing of the air inlet cavity and the exhaust cavity.

[0026] The molecular sieve gas path control device of the present invention utilizes the air inlet cavity and the exhaust cavity of the end cover and the gas path body to form two silencer cavities. The high-pressure gas source enters the air inlet cavity through the air inlet joint and then enters the molecular sieve tower through the control valve assembly. When the control valve assembly is opened and closed, the gas smoothly enters the control valve assembly from the air inlet cavity and then enters the molecular sieve tower, thereby eliminating the instability of the airflow. During exhaust, the nitrogen in the molecular sieve tower is discharged into the exhaust cavity through the control valve assembly and then discharged to the outside. The exhaust airflow passes through a small space and enters the exhaust cavity in an orderly manner and then is discharged through the exhaust hole, thereby effectively eliminating the exhaust noise. At the same time, the high-pressure gas source, the control valve assembly, the air inlet joint and the molecular sieve tower are integrated into one by utilizing the gas path body without the need for an external joint, thereby effectively reducing the number of joints, reducing the risk of air leakage and simplifying maintenance. At the same time, the gas path structure has good packaging properties and a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a molecular sieve gas path control device of the present invention.

[0028] Figure 2 It is a structural schematic diagram of an air inlet channel of a molecular sieve air path control device of the present invention.

[0029] Figure 3 It is a structural schematic diagram of an exhaust channel of a molecular sieve gas path control device of the present invention.

[0030] Figure 4 It is a structural schematic diagram of a control valve motion pair of a molecular sieve gas path control device of the present invention.

[0031] The following are the descriptions of the reference numerals:

[0032] 1——end cover, 101——first cover body, 102——second cover body, 103——air inlet connector;

[0033] 2 - air circuit body, 201 - air inlet cavity, 202 - exhaust cavity, 203 - transition cavity, 204 - air inlet hole, 205 - exhaust hole;

[0034] 3 - control valve assembly, 301 - valve body,

[0035] 302——control valve core, 3021——air passage, 3022——support block, 3023——valve core seat

[0036] 303 - control valve kinematic pair, 3031 - first diaphragm, 3032 - second diaphragm, 3033 - connecting column, 3034 - first protrusion, 3035 - second protrusion, 3036 - air inlet notch;

[0037] 304——solenoid valve controller, 3041——driving gas circuit, 3042——reset gas circuit;

[0038] 4——Molecular sieve tower,

[0039] 5——Oxygen storage. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] Example 1

[0042] A molecular sieve gas path control device, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it includes an end cover 1, an air circuit body 2, and a control valve assembly 3. The end cover 1 is provided with an air inlet connector 103 connected to a high-pressure air source. The end cover 1 is sealed and connected to the air circuit body 2. The control valve assembly 3 is arranged in the air circuit body 2. The air circuit body 2 is provided with an air inlet cavity 201 and an exhaust cavity 202. The air inlet cavity 201 is respectively connected to the air inlet connector 103 and a molecular sieve tower 4, and the exhaust cavity 202 is respectively connected to an exhaust hole 205 and a molecular sieve tower 4. The control valve assembly 3 controls the opening and closing of the air inlet cavity 201 and the exhaust cavity 202.

[0043] The molecular sieve gas path control device of the present invention utilizes the air inlet cavity 201 and the exhaust cavity 202 of the end cover 1 and the gas path body 2 to form two silencer cavities. The high-pressure gas source enters the air inlet cavity 201 through the air inlet connector 103, and then enters the molecular sieve tower 4 through the control valve assembly 3. When the control valve assembly 3 is opened and closed, the gas smoothly enters the control valve assembly 3 from the air inlet cavity 201, and then enters the molecular sieve tower 4, eliminating the instability of the air flow. When exhausting, the nitrogen in the molecular sieve tower 4 is discharged to the exhaust cavity 202 through the control valve assembly 3, and then discharged to the outside. The exhaust airflow passes through a small space and enters the exhaust cavity 202 in an orderly manner, and then is discharged through the exhaust hole 205 set in the exhaust cavity 202, effectively eliminating the exhaust noise. At the same time, the high-pressure gas source, the control valve assembly 3, the air inlet connector 103, and the molecular sieve tower 4 are integrated into one by utilizing the gas path body 2, without the need for external connectors, effectively reducing the number of connectors, reducing the risk of air leakage, and simplifying maintenance; at the same time, the gas path structure has good packaging and a compact structure.

[0044] The exhaust cavity 202 surrounds the intake cavity 201, and the control valve assembly 3 is arranged in the intake cavity 201 and the exhaust cavity 202. The surrounding design effectively reduces the volume of the gas circuit body 2, and the integration is higher. The control valve assembly 3 is partially arranged in the intake cavity 201 and partially arranged in the exhaust cavity 202 to control the intake cavity 201, the exhaust cavity 202 and the molecular sieve tower to be connected or closed.

[0045] The end cover 1 includes a second cover 102 and a first cover 101. The first cover 101 is sealed and connected to the air inlet cavity 201, the second cover 102 is sealed and connected to the exhaust cavity 202, the first cover 101 and the second cover 102 are not connected, and the air inlet joint 103 is arranged on the first cover 101. The second cover 102 and the cavity of the gas circuit body 2 are sealed and connected to form the exhaust cavity 202, and the first cover 101 and the cavity of the gas circuit body 2 are sealed and connected to form the air inlet cavity 201. The second cover 102 and the first cover 101 and the cavity are adapted to form a sealed cavity. The second cover 102 and the cavity of the gas circuit body 2 can be sealed by using sealant, sealing ring and the like, as long as they can play a role of sealing and fixing. The first cover 101 is sealed and connected to the air inlet cavity 201, and the same sealing means can also be used.

[0046] The second cover body 102 and the first cover body 101 can be designed as a split structure, and then the first cover body 101 and the second cover body 102 can be sealed and fixed. They can also be designed as an integrated cover structure that is compatible with the near cavity and the exhaust cavity 202 to enhance its structural strength.

[0047] The control valve assembly 3 includes a solenoid valve controller 304, a control valve core 302, a valve body 301, and a control valve kinematic pair 303. The valve body 301 is provided with at least two air paths 3021, at least one of which is located in the intake cavity 201, and at least one of which is located in the exhaust cavity 202. The control valve core 302 is provided in the valve body 301, and the air path 3021 of the control valve core 302 is provided corresponding to the valve body 301. The control valve kinematic pair 303 is provided in the control valve core 302. The solenoid valve controller 304 drives the control valve kinematic pair 303 to move, open or close the air path 3021 provided in the intake cavity 201, and open or close the air path 3021 provided in the exhaust cavity 202. The control valve core 302 is connected to the cavity in the gas path body 2 through the gas path. The solenoid valve controller drives the control valve motion pair 303 to close or open the gas path channel 3021 of the valve core to achieve conduction between the molecular sieve tower 4 and the air inlet cavity 201 and the exhaust cavity 202. The structure is simple and easy to implement.

[0048] When the control valve core 302 is installed on the valve body 301 , the air path of the control valve core and the air path of the valve body 301 are correspondingly arranged and communicate with each other.

[0049] The gas path channel 3021 is configured as an annular gap, and the annular gaps are fixedly connected by support blocks 3022 .

[0050] The annular gas path facilitates high-pressure gas to enter the valve body 301 through the annular air passage. Compared with pipelines, it has better permeability, uniform gas output, no airflow explosion, no significant impact on the interior of the valve, low noise, and high airflow stability.

[0051] like Figure 4 As shown, the control valve kinematic pair 303 includes a first diaphragm 3031 , a second diaphragm 3032 and a connecting column 3033 , and the effective gas contact area of ​​the second diaphragm 3032 is smaller than that of the first diaphragm 3031 .

[0052] The diaphragm design of the control valve kinematic pair 303 allows the first diaphragm 3031 to move toward the second diaphragm 3032 when both ends are filled with air at the same time.

[0053] A first protrusion 3034 is provided on the inner side of the first diaphragm 3031, and a second protrusion 3035 is provided on the inner side of the second diaphragm 3032. The first protrusion 3034 and the second protrusion 3035 are fixedly connected via a connecting column 3033. When the first diaphragm 3031 and the second diaphragm 3032 are subjected to force at the same time, the first protrusion 3034 moves axially to drive the connecting column 3033 and the second protrusion 3035 to move. When the first diaphragm 3031 is not subjected to force, the first diaphragm 3031 rebounds due to the high-pressure gas pressure of the second diaphragm 3032, and the first protrusion 3034, the connecting column 3033 and the second protrusion 3035 are reset.

[0054] The present invention utilizes the design of the protrusion to achieve the conduction of the air path channel 3021. The movement of the diaphragm drives the movement of the protrusion, thereby achieving sealing or opening a gap with the valve core. The connecting column 3033 is set as a hard column to transmit the pressure received by the diaphragm, thereby completing the movement.

[0055] The second diaphragm 3032 is provided with an air inlet notch 3036 along the circumferential direction. The air inlet notch 3036 can not only reduce the contact area difference between the second diaphragm 3032 and the first diaphragm 3031, but also facilitate the exhaust of gas through the air inlet notch, and the air flow uniformity is good.

[0056] The control valve core 302 includes at least two air passages 3021 and a valve core seat 3023. The valve core seat 3023 is provided with an air inlet 204 which is connected to the molecular sieve tower 4. The air passages 3021 are located on both sides of the valve core seat 3023. The control valve kinematic pair 303 is arranged in the control valve core 302. The first protrusion 3034 and the second protrusion 3035 are located on both sides of the valve core seat 3023. The connecting column 3033 is located in the middle of the valve core seat 3023 and forms a transition cavity 203 with the inner wall of the valve core seat 3023. When the first diaphragm 3031 is subjected to force, the first protrusion 3034 and the second protrusion 3035 are located on both sides of the valve core seat 3023. One side of the valve core seat 3023 fits tightly, and there is a gap between the second protrusion 3035 and the other side of the valve core seat 3023, connecting the air intake cavity 201, the transition cavity 203 and the molecular sieve tower 4, and the exhaust cavity 202 is not connected to the transition cavity 203. When the first diaphragm 3031 is not subjected to force, a gap is set between the first protrusion 3034 and one side of the valve core seat 3023, and the second protrusion 3035 fits tightly with one side of the valve core seat 3023, the molecular sieve tower 4, the transition cavity 203 and the exhaust cavity 202 are connected, and the air intake cavity 201 is not connected to the transition cavity 203.

[0057] The first diaphragm 3031 and the second diaphragm 3032 of the control valve kinematic pair 303 are fixed to the valve core. When the first diaphragm 3031 is subjected to force, the diaphragm is recessed inward, thereby driving the first protrusion 3034, the connecting column 3033 and the second protrusion 3035 to move, connecting the cavity between the diaphragms with the intake cavity 201. When the first diaphragm 3031 is not subjected to force, the first diaphragm 3031 rebounds, driving the first protrusion 3034, the connecting column 3033 and the second protrusion 3035 to reset, and the cavity between the diaphragms is connected to the exhaust cavity 202. The solenoid valve controller 304 can control the movement of the control valve kinematic pair 303 through airflow control, thereby controlling the opening of the intake channel or the exhaust channel.

[0058] The solenoid valve controller 304 includes a bypass solenoid valve and an air circuit control component. The bypass solenoid valve controls the opening and closing of the air circuit control component. The air circuit control component is provided with three ports. The first end is connected to the first diaphragm 3031 through the air circuit connector, the second end is connected to the air intake cavity 201, and the third end is connected to the outside atmosphere. The air circuit connector is provided in the control valve core. The air circuit control component opens the first port and the second port, and introduces high-pressure gas into the air circuit connector to drive the first diaphragm 3031 to deform under force, thereby opening the air intake channel. When the bypass solenoid valve is opened, the air circuit control component opens the third port and closes the second port, and the first diaphragm 3031 is reset to open the exhaust channel.

[0059] The present invention uses a bypass solenoid valve and an air circuit control component to complete the control of the valve body 301. The air circuit control component includes a driving air circuit 3041 and a reset air circuit 3042. When the bypass solenoid valve is opened, the driving air circuit 3041 and the reset air circuit 3042 are connected. The reset air circuit 3042 is connected to the air intake cavity 201. The high-pressure gas in the air intake cavity 201 is transmitted to the driving air circuit 3041 through the reset air circuit 3042. The driving air circuit 3041 is input into the control valve core 302 through the air circuit connector. At this time, the control valve motion pair The air pressure on both sides of 303 is equal. Since the force-bearing area of ​​the first diaphragm 3031 is larger than the force-bearing area of ​​the second diaphragm 3032, the first diaphragm 3031 is deformed toward the second diaphragm 3032, resulting in a concave shape. A gap is generated between the second protrusion 3035 and the valve core seat 3023. The gas path 3021 is connected to the air inlet cavity 201 and the transition cavity 203, so that the air inlet channel is opened, and the high-pressure gas enters the molecular sieve tower 4. The air inlet channel refers to the air inlet cavity 201, the transition cavity 203, and the molecular sieve tower.

[0060] The bypass solenoid valve is opened, the reset gas path 3042 is blocked, the high-pressure gas in the driving gas path 3041 is discharged, and the first diaphragm 3031 is reset and rebounded, so that the gap between the first protrusion 3034 and the valve core seat 3023 is opened, so that the exhaust cavity 202 and the transition cavity are connected, and the nitrogen in the molecular sieve tower 4 is discharged from the exhaust cavity 202 through the transition cavity.

[0061] At least two molecular sieve towers 4 are provided, and a molecular sieve gas path control device is provided corresponding to each molecular sieve tower 4, and each molecular sieve gas path control device is respectively connected to its corresponding molecular sieve tower.

[0062] The molecular sieve gas path control device of the present invention can be provided corresponding to each molecular sieve tower 4 .

[0063] The air inlet connectors 103 are provided with two and are arranged on an end cover 1. The air inlet cavity 201 is provided with one and is respectively connected to the two molecular sieve towers 4. The exhaust cavity 202 is provided with one and is respectively connected to the two molecular sieve towers 4. Two valve bodies 301 and valve cores are provided to respectively control the two molecular sieve towers 4 to be connected to the air inlet cavity 201 and to respectively control the two molecular sieve towers 4 to be connected to the exhaust cavity 202.

[0064] The present invention provides a combined molecular sieve gas path control device, which can connect two molecular sieve towers 4 respectively, effectively saving volume. The present invention can also set three or two groups of molecular sieve gas path control devices to achieve gas path control of multiple molecular sieve towers 4.

[0065] Embodiment 2: An oxygen generator comprises a molecular sieve gas path control device, a molecular sieve tower 4 and an oxygen storage device 5, wherein one end of the molecular sieve tower 4 is connected to the oxygen storage device 5 to transmit oxygen into the oxygen storage device 5, and the oxygen connector is arranged on the oxygen storage device 5.

[0066] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A molecular sieve gas path control device, characterized in that: It includes an end cover, a gas circuit body, and a control valve assembly, wherein the end cover is provided with an air inlet connector connected to a high-pressure gas source, the end cover is sealed and connected to the gas circuit body, the control valve assembly is arranged in the gas circuit body, an air inlet cavity and an air exhaust cavity are arranged in the gas circuit body, the air inlet cavity is respectively connected to the air inlet connector and a molecular sieve tower, the air exhaust cavity is respectively connected to an exhaust hole and a molecular sieve tower, and the control valve assembly controls the opening and closing of the air inlet cavity and the air exhaust cavity; The exhaust cavity surrounds the intake cavity, and the control valve assembly is respectively arranged in the intake cavity and the exhaust cavity; The control valve assembly includes a solenoid valve controller, a control valve core, a valve body, and a control valve kinematic pair. The valve body is provided with at least two gas paths, wherein at least one gas path is located in the air intake cavity, and at least one gas path is located in the air exhaust cavity. The control valve core is provided in the valve body, and the gas path of the control valve core is provided corresponding to the gas path of the valve body. The control valve kinematic pair is provided in the control valve core. The solenoid valve controller drives the control valve kinematic pair to move, opens or closes the gas path to connect the air intake cavity and the molecular sieve tower, and opens or closes the gas path to connect the air exhaust cavity and the molecular sieve tower. The control valve kinematic pair comprises a first diaphragm, a second diaphragm and a connecting column, and the effective gas contact area of ​​the second diaphragm is smaller than that of the first diaphragm; A first protrusion is provided on the inner side of the first diaphragm, and a second protrusion is provided on the inner side of the second diaphragm. The first protrusion and the second protrusion are fixedly connected via a connecting column. When the first diaphragm and the second diaphragm are subjected to force at the same time, the first protrusion moves axially to drive the connecting column and the second protrusion to move. When the first diaphragm is not subjected to force, the first diaphragm returns to its original position and rebounds, driving the first protrusion and the second protrusion to return to their original position.

2. The molecular sieve gas path control device according to claim 1, characterized in that: The end cover comprises a second cover body and a first cover body, the first cover body is sealed and connected to the air intake cavity, the second cover body is sealed and connected to the air exhaust cavity, and the air intake joint is arranged on the first cover body.

3. The molecular sieve gas path control device according to claim 1, characterized in that: The gas path channel is configured as annular gaps, and the annular gaps are fixedly connected by support blocks.

4. The molecular sieve gas path control device according to claim 1, characterized in that: The second diaphragm is provided with an air inlet notch along the circumferential direction.

5. The molecular sieve gas path control device according to claim 1, characterized in that: The control valve core includes at least two air paths and a valve core seat. The valve core seat is provided with an air inlet hole connected to the molecular sieve tower. The air paths are located on both sides of the valve core seat. The control valve motion pair is provided in the control valve core and is fixedly connected to the control valve core. The first protrusion and the second protrusion are located on both sides of the valve core seat. The connecting column is located in the middle of the valve core seat and forms a transition cavity with the inner wall of the valve core seat. When the first diaphragm is subjected to force, the first protrusion fits tightly with one side of the valve core seat, and there is a gap between the second protrusion and the other side of the valve core seat, connecting the air inlet cavity, the transition cavity and the molecular sieve tower. When the first diaphragm is reset, a gap is provided between the first protrusion and one side of the valve core seat, and the second protrusion fits tightly with one side of the valve core seat. The molecular sieve tower, the transition cavity and the exhaust cavity are connected.

6. The molecular sieve gas path control device according to claim 1, characterized in that: The solenoid valve controller includes a bypass solenoid valve and an air circuit control component. The bypass solenoid valve controls the opening and closing of the air circuit control component. The air circuit control component is provided with three ports. The first end is connected to the first diaphragm through the air circuit connector, the second end is connected to the air intake cavity, and the third end is connected to the outside atmosphere. The air circuit connector is provided in the control valve core. The air circuit control component opens the first port and the second port, and introduces high-pressure gas into the air circuit connector to drive the first diaphragm to deform under force, thereby opening the air intake channel. When the bypass solenoid valve is opened, the air circuit control component opens the third port, closes the second port, the first diaphragm is reset, and the exhaust channel is opened.

7. The molecular sieve gas path control device according to any one of claims 1 to 6, characterized in that: At least two molecular sieve towers are provided, and a molecular sieve gas path control device is provided corresponding to each molecular sieve tower, and each molecular sieve gas path control device is respectively connected to its corresponding molecular sieve tower.

8. The molecular sieve gas path control device according to claim 7, characterized in that: The air inlet connectors are provided with two and are arranged on an end cover. The air inlet cavity is provided with one and is respectively connected to the two molecular sieve towers. The exhaust cavity is provided with one and is respectively connected to the two molecular sieve towers. Two valve bodies and valve cores are provided to respectively control the two molecular sieve towers to be connected to the air inlet cavity and to respectively control the two molecular sieve towers to be connected to the exhaust cavity.

9. An oxygen concentrator, characterized in that: It comprises the molecular sieve gas path control device, molecular sieve tower and oxygen storage as described in any one of claims 1 to 8, one end of the molecular sieve tower is connected to the oxygen storage to transmit oxygen into the oxygen storage, and the oxygen connector is arranged in the oxygen storage.

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