[특허]Pressure swing adsorption oxygen generator

Ventec Life Systems, Inc.

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Pressure swing adsorption oxygen generator

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01D-053/02 A61M-016/10 A61M-016/20 A61M-016/08 A61M-016/00 B01D-053/053 B01D-053/047
출원번호	US-0695708 (2015-04-24)
등록번호	US-10046134 (2018-08-14)
발명자 / 주소	DeVries, Douglas F. Marquardt, Brian
출원인 / 주소	Ventec Life Systems, Inc.
대리인 / 주소	Perkins Coie LLP
인용정보	피인용 횟수 : 0 인용 특허 : 351

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A pressure swing adsorption oxygen generator to separate oxygen from air for use with a pressure source generating a high pressure and a low pressure. The pressure swing adsorption oxygen generator includes an adsorption bed having a bed of nitrogen absorbent material; and a multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being couplable to the pressure source for fluid communication therewith and in fluid communication with the adsorption bed. The rotary valve includes a cam having first and second rotary positions, in the first rotary position of the cam the rotary valve communicating high pressure generated by the pressure source to the adsorption bed and in the second rotary position of the cam the rotary valve communicating low pressure generated by the pressure source to the adsorption bed.

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1. A pressure swing adsorption oxygen generator to separate oxygen from air, comprising: a single pump providing both a high-pressure and a low-pressure;an adsorption bed having a bed of nitrogen absorbent material; anda multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being coupled to the single pump for fluid communication therewith and in fluid communication with the adsorption bed, the rotary valve including a cam having first and second rotary positions, in the first rotary position of the cam the rotary valve communicating high pressure generated by the single pump to the adsorption bed and in the second rotary position of the cam the rotary valve communicating low pressure generated by the single pump to the adsorption bed. 2. A pressure swing adsorption oxygen generator to separate oxygen from air for use with a pressure source generating a high pressure and a low pressure, comprising: an adsorption bed having a bed of nitrogen absorbent material; anda multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being couplable to the pressure source for fluid communication therewith and in fluid communication with the adsorption bed, the rotary valve including a cam having a first and second rotary positions, in the first rotary position of the cam the rotary valve communicating high pressure generated by the pressure source to the adsorption bed and in the second rotary position of the cam to rotary valve communicating low pressure generated by the pressure source to the adsorption bed;an oxygen storage unit connected to the adsorption bed;a first regulator which upon a sensed first condition when the cam is in the first rotary position permits oxygen generated within the adsorption bed to pass to the oxygen storage unit; anda second regulator which upon a sense second condition when the cam is in the second rotary position permits a portion of the oxygen in the oxygen storage unit to enter the adsorption bed to assist in purging nitrogen from the adsorption bed. 3. A pressure swing adsorption oxygen generator to separate oxygen from air for use with a pressure source generating a high pressure and a low pressure, comprising: an adsorption bed having a bed of nitrogen absorbent material; anda multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being couplable to the pressure source for fluid communication therewith and in fluid communication with the adsorption bed, the rotary valve including a cam having a first and second rotary positions, in the first rotary position of the cam the rotary valve communicating high pressure generated by the pressure source to the adsorption bed and in the second rotary position of the cam to rotary valve communicating low pressure generated by the pressure source to the adsorption bed;an oxygen storage unit;a first pressure regulator connected to the adsorption bed and to the oxygen storage unit, and in response to pressure in the adsorption bed rising to a preselected first pressure, the first pressure regulator regulating the pressure in the adsorption bed to the preselected first pressure and permitting oxygen generated within the adsorption bed to pass through the first pressure regulator to the oxygen storage unit; anda second pressure regulator connected to the adsorption bed and to the oxygen storage unit, and in response to pressure in the adsorption bed falling to a preselected second pressure that is lower than the preselected first pressure, the pressure regulator regulating the pressure in the adsorption bed to the preselected second pressure and permitting stored oxygen within the oxygen storage unit to pass through the second pressure regulator to the adsorption bed. 4. The pressure swing adsorption oxygen generator of claim 3, wherein the first pressure regulator prevents fluid communication through the first pressure regulator between the adsorption bed and the oxygen storage unit when the pressure in the adsorption bed is below the preselected first pressure, and the second pressure regulator prevents fluid communication through the second pressure regulator between the oxygen storage unit and the adsorption bed when the pressure in the adsorption bed is above the preselected second pressure. 5. A pressure swing adsorption oxygen generator to separate oxygen from air, comprising: a single pump providing a high pressure and a low pressure;an adsorption bed having a bed of nitrogen absorbent material; anda multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being in fluid communication with the single pump and the adsorption bed, the rotary valve including a cam having first and second rotary positions, in the first rotary position of the cam the rotary valve communicating high pressure generated by the single pump to the adsorption bed and in the second rotary position of the cam the rotary valve communicating low pressure generated by the single pump to the adsorption bed. 6. The pressure swing adsorption oxygen generator of claim 5, wherein the single pump is a compressor, and the high pressure generated is a positive pressure and the low pressure generated is a negative pressure. 7. A pressure swing adsorption oxygen generator to separate oxygen from air, comprising: a single pump providing both a high-pressure and a low-pressure;an adsorption bed having a bed of nitrogen absorbent material; anda multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being coupled to the single pump for fluid communication therewith and in fluid communication with the adsorption bed, the rotary valve having:a cam having at least first and second rotary positions;a rotary actuator configured to rotate the cam; anda plurality of valves operative in response to the rotary position of the cam, in the first rotary position of the cam at least one of the valves communicating high pressure generated by the single pump to the adsorption bed and in the second rotary position of the cam at least one of the valves communicating low pressure generated by the single pump to the adsorption bed. 8. A pressure swing adsorption oxygen generator to separate oxygen from air for use with a pressure source generating a high pressure and a low pressure, comprising: an adsorption bed having a bed of nitrogen absorbent material; anda multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being couplable to the pressure source for fluid communication therewith and in fluid communication with the adsorption bed, the rotary valve having:a cam having at least first and second rotary positions;a rotary actuator configured to rotate the cam; anda plurality of valves operative in response to the rotary position of the cam, in the first rotary position of the cam at least one of the valves communicating high pressure generated by the pressure source to the adsorption bed and in the second rotary position of the cam at least one of the valves communicating low pressure generated by the pressure source to the adsorption bed;wherein the pressure source is a compressor with the high pressure being at an output port and the low pressure being at an input port, wherein the plurality of valves includes first, second, third and fourth valves, each having a first port and a second port which are in fluid communication with each other in a first state and out of fluid communication with each other in a second state, and selectively movable between the first and second states,the first port of the first valve being in fluid communication with the compressor output port and the second port of the first valve being in fluid communication with atmosphere,the first port of the second valve being in fluid communication with the adsorption bed and the second port of the second valve being in fluid communication with the compressor output port,the first port of the third valve being in fluid communication with the adsorption bed and the second port of the third valve being in fluid communication with the compressor input port,the first port of the fourth valve being in fluid communication with the compressor input port and the second port of the fourth valve being in fluid communication with a supply of air from which oxygen is to be separated,the first, second, third and fourth valves being moved between the first and second states in a repeated sequence in response to rotation of the cam, wherein when the cam is in the first rotary position the second and fourth valves are in the first state and the first and third valves are in the second state, and when the cam is in the second rotary position the first and third valves are in the first state and the second and fourth valves are in the second state. 9. The pressure swing adsorption oxygen generator of claim 8, wherein the first and third valves are moved by the cam between the first and second states in unison, and the second and fourth valves are moved by the cam between the first and second states in unison. 10. The pressure swing adsorption oxygen generator of claim 8, wherein the cam has first and second cam lobes, and further has third and fourth rotary positions, wherein when the cam is moved to the first rotary position the first cam lobe moves the fourth valve to the first state and the second cam lobe moves the second valve to the first state, and the first and third valves are in the second state, when the cam is moved to the second rotary position the first cam lobe moves the first valve to the first state and the second cam lobe moves the third valves to the first state, and the second and fourth valves are in the second state, when the cam is moved to the third rotary position the first cam lobe moves the second valve to the first state and the second cam lobe moves the fourth valve to the first state, and the first and third valves are in the second state, and when the cam is moved to the fourth rotary position the first cam lobe moves the third valve to the first state and the second cam lobe moves the first valves to the first state, and the second and fourth valves are in the second state. 11. The pressure swing adsorption oxygen generator of claim 7, wherein each of the valves includes: a poppet member;a seat having a seat aperture; anda pushrod member having a cam follower abutting the cam for movement of the pushrod in response to rotation of the cam between the first and second rotary positions of the cam, the poppet member being coupled to the pushrod member for movement therewith to move the poppet member into and out of seated arrangement with the seat to close and open the seat aperture in response to rotation of the cam. 12. The pressure swing adsorption oxygen generator of claim 11, wherein each of the valves further includes a housing with an end opening toward the cam, the poppet member and seat being positioned in the housing with the pushrod extending through the housing end opening, and further includes a flexible diaphragm positioned between the seat and the cam and having an opening through which the pushrod extends, the diaphragm closing the housing end opening, and having a peripheral portion coupled to the housing and a central portion coupled to the pushrod for movement therewith, the diaphragm having an effective area and the poppet valve having a closure area closing the seat aperture, the effective area of the diaphragm and the closure area of the poppet valve being sized to offset the force on the pushrod resulting from the pressure within the chamber between the seat and the diaphragm when the poppet valve is in seated arrangement with the seat, thereby reducing the force on the cam follower of the pushrod member. 13. A pressure swing adsorption oxygen generator to separate oxygen from air, comprising: a compressor having an input port and an output port;an adsorption bed having a bed of nitrogen absorbent material; anda multi-position rotary valve for controlling pressure swing adsorption of the adsorption bed, and being in fluid communication with the compressor and the adsorption bed, the rotary valve having:a cam;a rotary actuator configured to rotate the cam; andfirst, second, third and fourth valves, each having a first port and a second port which are in fluid communication with each other in a first state and out of fluid communication with each other in a second state, and selectively movable between the first and second states in response to the rotary position of the cam,the first port of the first valve being in fluid communication with the compressor output port and the second port of the first valve being in fluid communication with atmosphere,the first port of the second valve being in fluid communication with the adsorption bed and the second port of the second valve being in fluid communication with the compressor output port,the first port of the third valve being in fluid communication with the adsorption bed and the second port of the third valve being in fluid communication with the compressor input port,the first port of the fourth valve being in fluid communication with the compressor input port and the second port of the fourth valve being in fluid communication with a supply of air from which oxygen is to be separated in the adsorption bed,the first, second, third and fourth valves being moved between the first and second states in a repeated sequence in response to rotation of the cam, wherein during a first period the second and fourth valves are in the first state and the first and third valves are in the second state, whereby air at high pressure is communicated to the adsorption bed to separate nitrogen from the air and generate oxygen, and during a second period occurring after the first period the first and third valves are in the first state and the second and fourth valves are in the second state, whereby nitrogen is purged from the adsorption bed. 14. The pressure swing adsorption oxygen generator of claim 13, further including: an oxygen storage unit connected to the adsorption bed;a first regulator which upon a sensed first condition during the first period permits the generated oxygen within the adsorption bed to pass to the oxygen storage unit; anda second regulator which upon a sense second condition during the second period permits a portion of the oxygen in the oxygen storage unit to enter the adsorption bed to assist in purging the nitrogen from the adsorption bed. 15. The pressure swing adsorption oxygen generator of claim 13, further including: an oxygen storage unit;a first pressure regulator connected to the adsorption bed and to the oxygen storage unit, and in response to pressure in the adsorption bed rising to a preselected first pressure, the first pressure regulator regulating the pressure in the adsorption bed to the preselected first pressure and permitting the generated oxygen within the adsorption bed to pass through the first pressure regulator to the oxygen storage unit; anda second pressure regulator connected to the adsorption bed and to the oxygen storage unit, and in response to pressure in the adsorption bed falling to a preselected second pressure that is lower than the preselected first pressure, the pressure regulator regulating the pressure in the adsorption bed to the preselected second pressure and permitting stored oxygen within the oxygen storage unit to pass through the second pressure regulator to the adsorption bed. 16. The pressure swing adsorption oxygen generator of claim 15, wherein the first pressure regulator prevents fluid communication through the first pressure regulator between the adsorption bed and the oxygen storage unit when the pressure in the adsorption bed is below the preselected first pressure, and the second pressure regulator prevents fluid communication through the second pressure regulator between the oxygen storage unit and the adsorption bed when the pressure in the adsorption bed is above the preselected second pressure. 17. The pressure swing adsorption oxygen generator of claim 13, wherein during a third period occurring after the second period the second and fourth valves are in the first state and the first and third valves are in the second state, whereby air at high pressure is communicated to the adsorption bed to separate nitrogen from the air and generate oxygen, and during a fourth period occurring after the third period the first and third valves are in the first state and the second and fourth valves are in the second state, whereby nitrogen is purged from the adsorption bed. 18. The pressure swing adsorption oxygen generator of claim 13, wherein the first and third valves are positioned opposite each other on opposing sides of the cam, and the second and fourth valves are positioned opposite each other on opposing sides of the cam. 19. The pressure swing adsorption oxygen generator of claim 18, wherein the cam has first and second cam lobes, and wherein during the first period the first cam lobe moves the fourth valve to the first state and the second cam lobe moves the second valve to the first state, and the first and third valves are in the second state, during the second period the first cam lobe moves the first valve to the first state and the second cam lobe moves the third valves to the first state, and the second and fourth valves are in the second state, during the third period the first cam lobe moves the second valve to the first state and the second cam lobe moves the fourth valve to the first state, and the first and third valves are in the second state, and during the fourth period the first cam lobe moves the third valve to the first state and the second cam lobe moves the first valves to the first state, and the second and fourth valves are in the second state.

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