Rotary valve applied to five-tower circulating oxygen generator and oxygen generation method

Abstract

The invention relates to the technical field of oxygen generators, in particular to a rotary valve applied to a five-tower circulation oxygen generator and an oxygen generation method.The rotary valve applied to the five-tower circulation oxygen generator comprises a connecting rod, an upper rotary valve body, an upper sealing plate, an upper sealing cover, a molecular sieve tower, a lower sealing cover, a lower sealing plate, a lower rotary valve body, an air inlet connector, a nitrogen discharging connector and an oxygen outlet connector; asymmetric distribution is adopted, pressure equalizing, oxygen outlet and back flushing holes of the lower rotary valve body are located on the same circle, it is guaranteed that the holes can completely correspond to one another, the pressure equalizing groove is formed by connecting five holes, it can be guaranteed that no matter which molecular sieve tower needs to be subjected to pressure equalizing, at least one pressure equalizing object can be found, and an oxygen outlet inner cavity is formed in the lower rotary valve body; and the space is saved, and meanwhile, the back flushing and oxygen discharging efficiency is improved, so that the problems that the design of the existing rotary valve for completing five-tower flow conversion is relatively complicated, and the processing cost and difficulty are improved are solved.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen generators, and in particular to a rotary valve applied to a five-tower circulating oxygen generator and an oxygen production method. Background Art

[0002] The rotary valve is a key component in the PSA oxygen generator, which controls the flow of gas, allowing the oxygen generator to extract oxygen according to a specific process flow. Most existing oxygen generators use solenoid valves to control the on and off of the air flow, but this method has some problems, such as high noise, poor electrical control reliability, complex structure, and may not be able to start in areas with thin air such as plateaus due to insufficient pre-pressure.

[0003] At present, the prior art (CN217549426U) discloses a rotary valve for completing the five-tower process conversion. The device completes the work of air intake, nitrogen exhaust and oxygen outlet through the upper and lower valve bodies. By arranging different grooves on the valve body, a passage is provided for the conversion of different oxygen production processes. The upper and lower valve bodies are driven by a motor to realize the coordination of the connection relationship between the air inlet hole and the air inlet groove, the oxygen outlet groove, the nitrogen exhaust port and the nitrogen exhaust groove, the backflush groove and the pressure equalizing groove, and complete a complete set of oxygen production processes through different switch states.

[0004] However, using the above method, the design of the rotary valve of the five-tower oxygen generator is relatively complicated, which increases the processing cost and difficulty. Summary of the invention

[0005] The object of the present invention is to provide a rotary valve and an oxygen production method applied to a five-tower circulating oxygen generator, aiming to solve the problem that the existing rotary valve for completing the five-tower process conversion is relatively complex in design, which increases the processing cost and difficulty.

[0006] To achieve the above-mentioned object, in a first aspect, the present invention provides a rotary valve applied to a five-tower circulating oxygen generator, comprising a connecting rod, an upper rotary valve body, an upper sealing plate, an upper sealing cover, a molecular sieve tower, a lower sealing cover, a lower sealing plate, a lower rotary valve body, an air inlet connector, a nitrogen exhaust connector and an oxygen outlet connector;

[0007] The upper rotary valve body is rotatably connected to the connecting rod and is located on one side of the connecting rod. The upper sealing plate is fixedly connected to the upper rotary valve body and is located on one side of the upper rotary valve body. The upper sealing cover is fixedly connected to the upper sealing plate and is located on one side of the upper sealing plate. The five molecular sieve towers are respectively fixedly connected to the upper sealing cover and are located on one side of the upper sealing cover. The lower sealing cover is fixedly connected to the molecular sieve tower and is located on a side of the molecular sieve tower away from the upper sealing cover. The lower sealing plate is fixedly connected to the lower sealing cover and is located on one side of the lower sealing cover. The lower rotary valve body is rotatably connected to the lower sealing plate and is located on a side of the lower sealing plate away from the lower sealing gasket. The air inlet joint is fixedly connected to the upper sealing cover and is located on one side of the upper sealing cover. The nitrogen exhaust joint is fixedly connected to the upper sealing cover and is located on a side of the upper sealing cover away from the air inlet joint. The oxygen outlet joint is fixedly connected to the lower sealing cover and is located on one side of the lower sealing cover.

[0008] Among them, the rotary valve applied to the five-tower circulating oxygen generator also includes an upper sealing gasket and a lower sealing gasket. The upper sealing gasket is fixedly connected to the upper sealing plate and is located on the side of the upper sealing plate away from the upper rotary valve body. The lower sealing gasket is fixedly connected to the lower sealing cover and is located on one side of the lower sealing cover.

[0009] Among them, the upper rotary valve body has an air intake groove, a first annular outer groove, a first annular inner groove and a nitrogen exhaust groove, the air intake groove is located on one side of the upper rotary valve body, the first annular outer groove is located on the side of the air intake groove, the first annular inner groove is located on the side of the upper rotary valve body, and the nitrogen exhaust groove is located on a side close to the first annular inner groove.

[0010] Among them, the upper sealing cover has an air hole, a second annular outer groove and a second annular inner groove, the air hole is located on one side of the upper sealing cover, the second annular outer groove is connected with the air inlet joint and is located on one side of the upper sealing cover, and the second annular inner groove is connected with the nitrogen exhaust joint and is located on the side of the upper sealing cover away from the second annular outer groove.

[0011] Wherein, the lower rotary valve body comprises a backblowing groove, a backblowing flow limiting hole, a third annular inner groove, an oxygen supply groove, an oxygen flow limiting hole, an oxygen outlet groove, an oxygen outlet flow limiting hole, a pressure equalizing groove, a pressure equalizing hole and an oxygen storage chamber, the backblowing groove is located on one side of the lower rotary valve body, the backblowing flow limiting hole is located on a side of the lower rotary valve body close to the backblowing groove, the third annular inner groove is located on one side of the lower rotary valve body, the oxygen supply groove is located on a side of the lower rotary valve body close to the third annular inner groove, the oxygen flow limiting hole is located on a side of the lower rotary valve body close to the oxygen supply groove, the oxygen outlet groove is located on one side of the lower rotary valve body, the oxygen outlet flow limiting hole is located on a side of the lower rotary valve body close to the oxygen outlet groove, the pressure equalizing groove is located on one side of the lower rotary valve body, the pressure equalizing hole is located on a side of the lower rotary valve body close to the pressure equalizing groove, and the oxygen storage chamber is located at the top of the lower rotary valve body.

[0012] In a second aspect, the present invention further provides an oxygen production method applied to a five-tower circulating oxygen generator, comprising:

[0013] The air inlet of the molecular sieve tower is closed, and the air outlet of the molecular sieve tower is now connected to the pressure equalizing hole of the lower rotary valve body, and the pressure is equalized with at most two molecular sieve towers through the pressure equalizing groove between the pressure equalizing holes;

[0014] Open the air inlet at the upper end of the molecular sieve tower and close the oxygen outlet at the lower end. The compressed air enters the second annular outer groove of the upper sealing cover from the air inlet joint, enters the first annular outer groove, and is input into the molecular sieve tower along the air inlet groove;

[0015] At the same time, the air inlet at the upper end of the molecular sieve tower and the oxygen outlet limiting hole at the lower end are opened. When compressed air is input into the molecular sieve tower from the air inlet joint, oxygen is discharged downward through the oxygen outlet limiting hole of the molecular sieve tower due to the entry of pressurized air, and the oxygen enters the oxygen storage cavity of the lower rotary valve body;

[0016] The air inlet on the upper part of the molecular sieve is connected to the nitrogen exhaust groove of the upper rotary valve body, and the lower oxygen outlet limiting hole is in a closed state. The nitrogen inside the molecular sieve tower is discharged through the air inlet on the upper part of the molecular sieve tower, and the nitrogen is discharged out of the device through the nitrogen exhaust joint of the upper rotary valve body;

[0017] The air inlet at the upper end of the molecular sieve tower is connected to the nitrogen exhaust groove of the upper rotary valve body, and the oxygen outlet at the lower end is connected to the backflush groove of the lower rotary valve body. Oxygen is discharged from the oxygen storage chamber in the lower rotary valve body through the limiting hole and the backflush groove and enters the molecular sieve tower for purging. The purged nitrogen is discharged through the air inlet at the upper part of the molecular sieve tower and discharged out of the device through the nitrogen exhaust joint.

[0018] A rotary valve applied to a five-tower circulating oxygen generator of the present invention comprises five molecular sieve towers which are parallel to each other and uniformly distributed around the same virtual perfect circle, with the longitudinal axis of the molecular sieve tower as the direction, the upper end is connected to the upper sealing cover, and the lower end is connected to the lower sealing cover, the outer diameter of each molecular sieve tower corresponding to the two sealing covers is larger than the molecular sieve tower body, and the lower end surface of the upper sealing cover coincides with the upper end surface of the molecular sieve tower, and the upper end surface of the lower sealing cover coincides with the lower end surface of the molecular sieve tower, and the upper and lower ends of each molecular sieve tower body are provided with openings as air inlet and air outlet holes, and these holes are uniformly distributed on the same circle at an angle of 72° to each other, and the cover cavities in the upper sealing cover and the lower sealing cover at both ends are connected to the end cover part by pipelines, and the cover cavity is in the original uniformly distributed seven holes, and compared with the traditional equipment, the second and sixth holes counted from a certain hole are deleted to form The invention discloses a novel non-uniform distribution of five holes, wherein the upper sealing cover is connected with the air inlet joint, the air inlet joint is communicated with an external air compressor, the nitrogen exhaust joint is arranged on the side of the upper sealing cover away from the air inlet joint, the nitrogen exhaust joint is communicated with an external vacuum pump, and the oxygen outlet joint is arranged on the lower sealing cover, the lower sealing plate is only provided with holes with the same distribution and size as the lower sealing cover, the upper end of the upper sealing plate is provided with the upper rotary valve body which is vertically corresponding and has the same diameter, and the lower end of the lower sealing plate is connected with the lower rotary valve body which is vertically corresponding and has the same size, thereby simplifying the complexity of gas circuit switching in the five-tower oxygen production process, optimizing the accuracy and stability of the oxygen production process conversion, avoiding interference between the gas circuits, reducing product costs, and improving product work efficiency, thereby solving the problem that the existing rotary valve design for completing the five-tower process conversion is relatively complex, and the processing cost and difficulty are increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0020] Figure 1 The present invention is a schematic diagram of the overall structure of a rotary valve applied to a five-tower circulating oxygen generator.

[0021] Figure 2 The present invention is a structural schematic diagram of a connecting rod, an upper sealing plate, an upper sealing gasket, a lower sealing plate and a lower sealing gasket of a rotary valve applied to a five-tower circulating oxygen generator.

[0022] Figure 3 The present invention is a schematic structural diagram of an upper rotary valve body of a rotary valve applied to a five-tower circulating oxygen generator.

[0023] Figure 4 The present invention is a schematic structural diagram of an upper sealing cover of a rotary valve applied to a five-tower circulating oxygen generator.

[0024] Figure 5 The present invention is a structural schematic diagram of a lower rotary valve body of a rotary valve applied to a five-tower circulating oxygen generator.

[0025] Figure 6 The present invention is a schematic structural diagram of a lower sealing cover of a rotary valve applied to a five-tower circulating oxygen generator.

[0026] Figure 7 The present invention is a flow chart of an oxygen production method applied to a five-tower circulating oxygen generator.

[0027] 101-connecting rod, 102-upper rotary valve body, 103-upper sealing plate, 104-upper sealing gasket, 105-upper sealing cover, 106-molecular sieve tower, 107-lower sealing cover, 108-lower sealing gasket, 109-lower sealing plate, 110-lower rotary valve body, 111-intake groove, 112-first annular outer groove, 113-first annular inner groove, 114-nitrogen exhaust groove, 115-air hole, 11 6-second annular outer groove, 117-second annular inner groove, 118-air inlet connector, 119-nitrogen exhaust connector, 120-oxygen outlet connector, 121-backflush groove, 122-backflush flow limiting hole, 123-third annular inner groove, 124-oxygen supply groove, 125-oxygen flow limiting hole, 126-oxygen outlet groove, 127-oxygen outlet flow limiting hole, 128-equalizing pressure groove, 129-equalizing pressure hole, 130-oxygen storage chamber. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0029] In the first aspect, the present invention provides a rotary valve for a five-tower circulating oxygen generator, see Figure 1 to Figure 6 , Figure 1 It is a schematic diagram of the overall structure of a rotary valve applied to a five-tower circulating oxygen generator according to the present invention. Figure 2 The present invention is a structural schematic diagram of a connecting rod, an upper sealing plate, an upper sealing gasket, a lower sealing plate and a lower sealing gasket of a rotary valve applied to a five-tower circulating oxygen generator. Figure 3 It is a structural schematic diagram of an upper rotary valve body of a rotary valve applied to a five-tower circulating oxygen generator according to the present invention. Figure 4 It is a structural schematic diagram of an upper sealing cover of a rotary valve applied to a five-tower circulating oxygen generator according to the present invention. Figure 5 It is a structural schematic diagram of a lower rotary valve body of a rotary valve applied to a five-tower circulating oxygen generator according to the present invention. Figure 6 The present invention is a schematic structural diagram of a lower sealing cover of a rotary valve applied to a five-tower circulating oxygen generator.

[0030] A rotary valve applied to a five-tower circulating oxygen generator of the present invention comprises a connecting rod 101, an upper rotary valve body 102, an upper sealing plate 103, an upper sealing gasket 104, an upper sealing cover 105, a molecular sieve tower 106, a lower sealing cover 107, a lower sealing gasket 108, a lower sealing plate 109, a lower rotary valve body 110, an air inlet joint 118, a nitrogen exhaust joint 119 and an oxygen outlet joint 120, wherein the upper rotary valve body 102 is provided with an air inlet groove 111, a first annular outer groove 112, a first annular inner groove 113 and a nitrogen exhaust groove 114, The upper sealing cover 105 is provided with the air hole 115, the second annular outer groove 116 and the second annular inner groove 117, and the lower rotary valve body 110 is provided with a backflush groove 121, a backflush flow limiting hole 122, a third annular inner groove 123, an oxygen supply groove 124, an oxygen flow limiting hole 125, an oxygen outlet groove 126, an oxygen outlet flow limiting hole 127, a pressure equalizing groove 128, a pressure equalizing hole and an oxygen storage chamber 130. The above-mentioned scheme solves the problem that the existing rotary valve design for completing the five-tower process conversion is relatively complicated, which increases the processing cost and difficulty.

[0031] According to the present specific embodiment, the upper rotary valve body 102 is rotatably connected to the connecting rod 101 and is located on one side of the connecting rod 101. The upper sealing plate 103 is fixedly connected to the upper rotary valve body 102 and is located on one side of the upper rotary valve body 102. The upper sealing cover 105 is fixedly connected to the upper sealing plate 103 and is located on one side of the upper sealing plate 103. The five molecular sieve towers 106 are respectively fixedly connected to the upper sealing cover 105 and are located on one side of the upper sealing cover 105. The lower sealing cover 107 is fixedly connected to the molecular sieve tower 106 and is located on a side of the molecular sieve tower 106 away from the upper sealing cover 105. The sealing plate 109 is fixedly connected to the lower sealing cover 107 and is located on one side of the lower sealing cover 107. The lower rotary valve body 110 is rotatably connected to the lower sealing plate 109 and is located on the side of the lower sealing plate 109 away from the lower sealing gasket 108. The molecular sieve towers 106 are parallel to each other and evenly distributed around the same virtual circle. The upper end of the molecular sieve tower 106 is connected to the upper sealing cover 105 and the lower end is connected to the lower sealing cover 107. The outer diameter of each molecular sieve tower 106 corresponding to the two sealing covers is larger than that of the molecular sieve tower 106, and the lower end surface of the upper sealing cover 105 is aligned with the upper end of the molecular sieve tower 106. The upper end surface of the lower sealing cover 107 coincides with the lower end surface of the molecular sieve tower 106. The upper and lower ends of each molecular sieve tower 106 are provided with openings as air inlet holes and air outlet holes. These holes are evenly distributed on the same circle at an angle of 72°. The cover cavity and the end cover part of the upper sealing cover 105 and the lower sealing cover 107 at both ends are connected by pipelines. The upper sealing cover 105 is connected to the air inlet connector 118, and the air inlet connector 118 is connected to an external air compressor. The nitrogen exhaust connector 119 is provided on the side of the upper sealing cover 105 away from the air inlet connector 118, and the nitrogen exhaust connector 119 is connected to an external vacuum pump, and the lower sealing cover 105 is provided with a nitrogen exhaust connector 119. The nitrogen exhaust connector 119 is connected to an external vacuum pump, and the nitrogen exhaust connector 119 is connected to an external vacuum pump. An oxygen outlet connector 120 is provided on the sealing cover 107, the lower sealing plate 109 is only provided with holes with the same distribution and size as the lower sealing cover 107, the upper end of the upper sealing plate 103 is provided with the upper rotary valve body 102 which is vertically corresponding and has the same diameter, and the lower end of the lower sealing plate 109 is connected with the lower rotary valve body 110 which is vertically corresponding and has the same size, thereby simplifying the complexity of gas circuit switching in the five-tower oxygen production process, optimizing the accuracy and stability of the oxygen production process conversion, avoiding interference between the gas circuits, reducing product costs, and improving product work efficiency, thereby solving the problem that the existing rotary valve design for completing the five-tower process conversion is relatively complex, which increases the processing cost and difficulty.

[0032] Among them, the upper sealing gasket 104 is fixedly connected to the upper sealing plate 103 and is located on the side of the upper sealing plate 103 away from the upper rotary valve body 102, and the lower sealing gasket 108 is fixedly connected to the lower sealing cover 107 and is located on one side of the lower sealing cover 107. The upper sealing gasket 104 is used to isolate the upper sealing plate 103 and the upper sealing cover 105, and the lower sealing gasket 108 is used to isolate the lower sealing plate 109 and the lower sealing cover 107, and corresponding holes are set on the upper sealing gasket 104 and the lower sealing gasket 108 to improve the practicability of the equipment.

[0033] Secondly, the air intake groove 111 is located on one side of the upper rotary valve body 102, the first annular outer groove 112 is located on the side of the air intake groove 111, the first annular inner groove 113 is located on the side of the upper rotary valve body 102, and the nitrogen exhaust groove 114 is located on the side close to the first annular inner groove 113. When the molecular sieve tower 106 is in the air intake stage, compressed air enters the upper sealing cover 105 through the air intake hole, and the compressed air enters the upper rotary valve body 102 through the first annular outer groove 112 and then enters the air intake groove 111. At this time, there will be a corresponding air intake hole on the upper sealing plate 103 and the upper sealing gasket 104 that is connected to the air intake groove 111, and the diameter of this air intake hole is smaller than the diameter of the air intake groove 111. The compressed air can be transported into the molecular sieve tower 106 through the corresponding air path that is connected at the current moment.

[0034] Again, the air hole 115 is located on one side of the upper sealing cover 105, the second annular outer groove 116 is located on one side of the upper sealing cover 105, and the second annular inner groove 117 is located on the side of the upper sealing cover 105 away from the second annular outer groove 116. The second annular outer groove 116 and the second annular inner groove 117 of the upper sealing cover 105 correspond to the first annular outer groove 112 and the second annular inner groove 117 of the upper rotary valve body 102. At the same time, the second annular outer groove 116 is connected to the air intake joint 118, and the second annular inner groove 117 is connected to the nitrogen exhaust joint 119. During the air intake process, gas enters from the air intake joint 118, and nitrogen enters from the nitrogen exhaust joint 119.

[0035] Finally, the back-blowing groove 121 is located on one side of the lower rotary valve body 110, the back-blowing flow limiting hole 122 is located on the side of the lower rotary valve body 110 close to the back-blowing groove 121, the third annular inner groove 123 is located on one side of the lower rotary valve body 110, the oxygen supply groove 124 is located on the side of the lower rotary valve body 110 close to the third annular inner groove 123, the oxygen flow limiting hole 125 is located on the side of the lower rotary valve body 110 close to the oxygen supply groove 124, the oxygen outlet groove 126 is located on one side of the lower rotary valve body 110, the oxygen outlet flow limiting hole 127 is located on the side of the lower rotary valve body 110 close to the oxygen outlet groove 126, and the pressure equalizing groove 128 is located on one side of the lower rotary valve body 110.

[0036] A rotary valve applied to a five-tower circulating oxygen generator of the present invention comprises five molecular sieve towers 106 which are parallel to each other and evenly distributed around the same virtual perfect circle, with the longitudinal axis of the molecular sieve tower 106 as the direction, the upper end is connected with the upper sealing cover 105, and the lower end is connected with the lower sealing cover 107, the outer diameter of each molecular sieve tower 106 corresponding to the upper sealing cover 105 and the lower sealing cover 107 is larger than the molecular sieve tower 106, and the lower end surface of the upper sealing cover 105 coincides with the upper end surface of the molecular sieve tower 106, the upper end surface of the lower sealing cover 107 coincides with the lower end surface of the molecular sieve tower 106, and the upper sealing cover 105 and the lower sealing cover 107 coincide with the lower end surface of the molecular sieve tower 106. The end cover part of 07 is also provided with the pores 115 of the same distribution and size, which coincide with the corresponding holes of the molecular sieve tower 106. The cover cavity in the upper sealing cover 105 and the lower sealing cover 107 is connected to the end cover part by a pipeline; for the upper sealing cover 105, the second annular outer groove 116 is connected with the air inlet joint 118, and the air inlet joint 118 is connected to an external air compressor, and the second annular inner groove 117 is connected with the nitrogen exhaust joint 119, and the nitrogen exhaust joint 119 is connected to an external vacuum pump. The air inlet joint 118 and the nitrogen exhaust joint 119 respectively penetrate the outer wall and the inner wall of the inner cavity of the upper sealing cover 105; for the lower sealing cover 107, the The oxygen outlet joint 120 is connected to the third annular inner groove 123; the upper sealing cover 105 and the lower sealing cover 107 are respectively connected with the upper sealing gasket 104, the upper sealing plate 103, the lower sealing gasket 108 and the lower sealing plate 109 from bottom to top; in addition to the air holes 115 with the same distribution and size as the upper sealing cover 105, the upper sealing gasket 104 and the upper sealing plate 103 are also provided with multiple air holes 115 with equal pressure distribution on the periphery, which are vertically corresponding to the second annular outer groove 116 of the upper sealing cover 105, but the diameter of the air hole 115 is smaller than the opening of the second annular outer groove 116; the lower sealing plate 109 and the lower sealing gasket 10 8 is only provided with holes with the same distribution and size as the lower sealing cover 107; the upper end of the upper sealing plate 103 is provided with the upper rotary valve body 102 which is vertically corresponding and has the same diameter, and the upper rotary valve body 102 is respectively provided with the first annular outer groove 112 and the second annular inner groove 117, the first annular outer groove 112 connects the two air intake grooves 111, and the second annular inner groove 117 connects the two nitrogen exhaust grooves 114, and the lower end of the lower sealing plate 109 is connected with the lower rotary valve body 110 which is vertically corresponding and has the same size, and the lower rotary valve body 110 is provided with the equalizing holes 129, and the equalizing holes 129 are connected to each other by a groove body which is approximately pentagonal;The oxygen outlet groove 126 and the back-blowing groove 121 are respectively provided on both sides of the pressure equalizing groove 128, and the corresponding back-blowing flow limiting holes 122 and the oxygen outlet flow limiting holes 127 are provided inside the oxygen outlet groove 126 and the back-blowing groove 121; the third annular inner groove 123, the oxygen groove and the oxygen flow limiting hole 125 are provided near the central through hole of the lower rotary valve body 110; a cavity is provided inside the lower rotary valve body 110 as the oxygen storage chamber 130, and the upper part of the oxygen storage chamber 130 is connected to the oxygen flow limiting hole 125 for oxygen output, the oxygen outlet flow limiting hole 127 for oxygen storage, and the back-blowing flow limiting hole 122 for taking out the oxygen in the oxygen storage chamber 130 for back-blowing. ;

[0037] Second, see Figure 7 , Figure 7 The present invention is a flow chart of an oxygen production method applied to a five-tower circulating oxygen generator.

[0038] The present invention also provides an oxygen production method applied to a five-tower circulating oxygen generator, comprising:

[0039] S1: Close the air inlet of the molecular sieve tower 106. The air outlet of the molecular sieve tower 106 is now connected to the pressure equalizing hole 129 of the lower rotary valve body 110, and the pressure is equalized with at most two molecular sieve towers 106 through the pressure equalizing groove 128 between the pressure equalizing holes 129;

[0040] The air inlet is in a closed state; the air outlet of the molecular sieve tower 106 is now connected to the pressure equalizing hole of the lower rotary valve body 110, and the pressure is equalized with at most two molecular sieve towers 106 through the pressure equalizing groove 128 between the pressure equalizing holes. By interconnecting the molecular sieve towers 106, the operating energy consumption is reduced while avoiding the situation where the pressure in the tower is too high or too low.

[0041] S2 opens the air inlet at the upper end of the molecular sieve tower 106 and closes the oxygen outlet at the lower end, and the compressed air enters the second annular outer groove 116 of the upper sealing cover 105 from the air inlet joint 118, and enters the first annular outer groove 112, and is input into the molecular sieve tower 106 along the air inlet groove 111;

[0042] The air inlet at the upper end of the molecular sieve tower 106 is opened and the oxygen outlet at the lower end is closed. The compressed air enters the second annular outer groove 116 of the upper sealing cover 105 from the air inlet joint 118. The compressed air in the second annular outer groove 116 enters the first annular outer groove 112 of the upper rotary valve body 102, passes through the air inlet groove 111 connected to the upper rotary valve body 102, enters the upper sealing plate 103, the upper sealing gasket 104, and the air inlet hole of the upper sealing cover 105, and is then input into the molecular sieve tower 106.

[0043] S3 opens the air inlet at the upper end of the molecular sieve tower 106 and the oxygen outlet limiting hole 127 at the lower end at the same time. When compressed air is input into the molecular sieve tower 106 from the air inlet connector 118, oxygen is discharged downward through the oxygen outlet limiting hole 127 of the molecular sieve tower 106 due to the entry of pressurized air, and the oxygen enters the oxygen storage chamber 130 of the lower rotary valve body 110;

[0044] The compressed air enters the second annular outer groove 116 of the upper sealing cover 105 from the air inlet joint 118, and the compressed air in the second annular outer groove 116 enters the first annular outer groove 112 of the upper rotary valve body 102, and enters the upper sealing plate 103, the upper sealing gasket 104, and the air inlet hole of the upper sealing cover 105 through the air inlet groove 111 connected to the upper rotary valve body 102, and is further input into the molecular sieve tower 106; at this time, due to the entry of pressurized air, oxygen is discharged downward through the oxygen outlet hole of the molecular sieve tower 106, and is output through the air holes of the lower sealing cover 107, the lower sealing gasket 108 and the lower sealing plate 109. At this time, the oxygen outlet groove 126 of the lower rotary valve body 110 corresponds vertically to the air hole of the lower sealing plate 109, and oxygen enters the oxygen storage chamber 130 of the lower rotary valve body 110 through the oxygen outlet groove 126 and the oxygen outlet limiting hole 127.

[0045] The upper air inlet of the S4 molecular sieve tower 106 is connected to the nitrogen exhaust groove 114 of the upper rotary valve body 102, and the lower oxygen outlet limiting hole 127 is in a closed state. The nitrogen inside the molecular sieve tower 106 is discharged through the upper air inlet of the molecular sieve tower 106, and the nitrogen is discharged out of the device through the nitrogen exhaust connector 119 of the upper rotary valve body 102;

[0046] The upper air inlet of the molecular sieve tower 106 is connected to the nitrogen exhaust path, and the lower oxygen outlet hole is in a closed state; the nitrogen inside the molecular sieve tower 106 is discharged through the upper air inlet of the molecular sieve tower 106, and is connected to the nitrogen exhaust groove 114 of the upper rotary valve body 102 through the corresponding air holes of the upper sealing cover 105, the upper sealing gasket 104, and the upper sealing plate 103. The nitrogen is connected to the first annular inner groove 113 connected to the nitrogen exhaust groove 114, and then discharged out of the device through the nitrogen exhaust joint 119 connected to the first annular inner groove 113.

[0047] The air inlet at the upper end of the S5 molecular sieve tower 106 is connected to the nitrogen exhaust groove 114 of the upper rotary valve body 102, and the oxygen outlet at the lower end is connected to the backflush groove 121 of the lower rotary valve body 110. Oxygen is discharged from the oxygen storage chamber 130 in the lower rotary valve body 110 through the backflush limiting hole 122 and the backflush groove 121, and enters the molecular sieve tower 106 for purging. The purged nitrogen is discharged through the air inlet at the upper part of the molecular sieve tower 106 and discharged out of the device through the nitrogen exhaust joint 119;

[0048] The air inlet at the upper end of the molecular sieve tower 106 is connected to the nitrogen exhaust path, and the oxygen outlet at the lower end is connected to the back-blowing path; oxygen is discharged from the oxygen storage chamber 130 in the lower rotary valve body 110 through the oxygen outlet limiting hole 127 and the back-blowing groove 121, and enters the interior of the molecular sieve tower 106 through the corresponding through holes of the lower sealing plate 109, the lower sealing gasket 108, the lower sealing cover 107, and the molecular sieve tower 106 for purging; the purged nitrogen is discharged through the air inlet at the upper part of the 106 molecular sieve tower, and is connected to the nitrogen exhaust groove 114 of the upper rotary valve body 102 through the corresponding air holes of the upper sealing cover 105, the upper sealing gasket 104, and the upper sealing plate 103; the nitrogen is connected to the third annular inner groove 123 connected to the nitrogen exhaust groove 114 through the nitrogen exhaust groove 114, and then discharged out of the device through the nitrogen exhaust joint 119 connected to the third annular inner groove 123.

[0049] The present invention is an oxygen generation method applied to a five-tower circulating oxygen generator, wherein the air hole of the molecular sieve tower 106 is not connected to any slot body of the upper rotary valve body 102, that is, the air inlet is in a closed state; the air outlet of the molecular sieve tower 106 is connected to the pressure equalizing hole 129 of the lower rotary valve body 110 at this time, and the pressure is equalized with at most two molecular sieve towers 106 through the pressure equalizing groove 128 between the pressure equalizing holes 129. The mutual connection of the molecular sieve towers 106 can reduce the operating energy consumption while avoiding the situation where the pressure in the tower is too high or too low, and reduce the internal pressure through analytical regeneration, which plays a role in desorption of impurities. At the same time, the molecular sieve is further desorbed, and the molecular sieve is purged with oxygen to further reduce the impurity residue on the molecular sieve, thereby improving the oxygen production effect. The process sequence during oxygen production is as follows: the air hole 115 is closed and not connected to any slot body, and the oxygen outlet is opened and connected to the pressure equalizing groove 128; the air hole 115 is opened and connected to the air inlet groove 111, and the oxygen outlet is closed and not connected to any groove; The pore 115 is opened and connected to the air inlet groove 111, and the oxygen outlet hole is opened and connected to the oxygen outlet groove 126; the pore 115 is closed and not connected to any groove body, and the oxygen outlet is opened and connected to the pressure equalizing groove 128; the pore 115 is opened and connected to the nitrogen exhaust groove 114, and the oxygen outlet hole is closed and not connected to any groove; the pore 115 is opened and connected to the nitrogen exhaust groove 114, and the oxygen outlet hole is opened and connected to the backflush groove 121; the pore 115 is closed and not connected to any groove body, and the oxygen outlet is opened and connected to the pressure equalizing groove 128 The pressure groove 128 is connected; for each of the molecular sieve towers 106, it will go through five steps of pressure equalization, pressure building adsorption, air intake and oxygen discharge, desorption regeneration and backwashing. The specific sequential process is divided into seven points, namely pressure equalization, pressure building adsorption, air intake and oxygen discharge, pressure equalization, desorption regeneration, backwashing, and pressure equalization; for a certain moment, any one of the five molecular sieve towers 106 executes a step in the process, and as time goes by, oxygen production will be completed in the order of the process, but the starting time is different.

[0050] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A rotary valve used in a five-tower circulating oxygen generator, characterized in that: It includes a connecting rod, an upper rotary valve body, an upper sealing plate, an upper sealing cover, five molecular sieve towers, a lower sealing cover, a lower sealing plate, a lower rotary valve body, an air inlet connector, a nitrogen exhaust connector and an oxygen outlet connector; The upper rotary valve body is rotatably connected to the connecting rod and is located on one side of the connecting rod. The upper sealing plate is fixedly connected to the upper rotary valve body and is located on one side of the upper rotary valve body. The upper sealing cover is fixedly connected to the upper sealing plate and is located on one side of the upper sealing plate. The five molecular sieve towers are respectively fixedly connected to the upper sealing cover and are located on one side of the upper sealing cover. The lower sealing cover is fixedly connected to the molecular sieve tower and is located on a side of the molecular sieve tower away from the upper sealing cover. The lower sealing plate is fixedly connected to the lower sealing cover and is located on one side of the lower sealing cover. The lower rotary valve body is rotatably connected to the lower sealing plate and is located on a side of the lower sealing plate away from the lower sealing gasket. The air inlet joint is fixedly connected to the upper sealing cover and is located on one side of the upper sealing cover. The nitrogen exhaust joint is fixedly connected to the upper sealing cover and is located on a side of the upper sealing cover away from the air inlet joint. The oxygen outlet joint is fixedly connected to the lower sealing cover and is located on one side of the lower sealing cover.

2. A rotary valve for a five-tower circulating oxygen generator as claimed in claim 1, characterized in that: The rotary valve used in the five-tower circulating oxygen generator also includes an upper sealing gasket and a lower sealing gasket. The upper sealing gasket is fixedly connected to the upper sealing plate and is located on a side of the upper sealing plate away from the upper rotary valve body. The lower sealing gasket is fixedly connected to the lower sealing cover and is located on one side of the lower sealing cover.

3. A rotary valve for use in a five-tower circulating oxygen generator as claimed in claim 2, characterized in that: The upper rotary valve body has an air intake groove, a first annular outer groove, a first annular inner groove and a nitrogen exhaust groove, wherein the air intake groove is located on one side of the upper rotary valve body, the first annular outer groove is located on the side of the air intake groove, the first annular inner groove is located on the side of the upper rotary valve body, and the nitrogen exhaust groove is located on a side close to the first annular inner groove.

4. A rotary valve for use in a five-tower circulating oxygen generator as claimed in claim 3, characterized in that: The upper sealing cover has an air hole, a second annular outer groove and a second annular inner groove, the air hole is located on one side of the upper sealing cover, the second annular outer groove is connected to the air inlet joint and is located on one side of the upper sealing cover, and the second annular inner groove is connected to the nitrogen exhaust joint and is located on a side of the upper sealing cover away from the second annular outer groove.

5. A rotary valve for use in a five-tower circulating oxygen generator as claimed in claim 4, characterized in that: The lower rotary valve body comprises a backblowing groove, a backblowing flow limiting hole, a third annular inner groove, an oxygen supply groove, an oxygen flow limiting hole, an oxygen outlet groove, an oxygen outlet flow limiting hole, a pressure equalizing groove, a pressure equalizing hole and an oxygen storage chamber, the backblowing groove is located on one side of the lower rotary valve body, the backblowing flow limiting hole is located on a side of the lower rotary valve body close to the backblowing groove, the third annular inner groove is located on one side of the lower rotary valve body, the oxygen supply groove is located on a side of the lower rotary valve body close to the third annular inner groove, the oxygen flow limiting hole is located on a side of the lower rotary valve body close to the oxygen supply groove, the oxygen outlet groove is located on one side of the lower rotary valve body, the oxygen outlet flow limiting hole is located on a side of the lower rotary valve body close to the oxygen outlet groove, the pressure equalizing groove is located on one side of the lower rotary valve body, the pressure equalizing hole is located on a side of the lower rotary valve body close to the pressure equalizing groove, and the oxygen storage chamber is located at the top of the lower rotary valve body.

6. An oxygen production method applied to a five-tower circulating oxygen generator, applied to a rotary valve applied to a five-tower circulating oxygen generator as claimed in claim 5, characterized in that: include; The air inlet of the molecular sieve tower is closed, and the air outlet of the molecular sieve tower is now connected to the pressure equalizing hole of the lower rotary valve body, and the pressure is equalized with at most two molecular sieve towers through the pressure equalizing groove between the pressure equalizing holes; Open the air inlet at the upper end of the molecular sieve tower and close the oxygen outlet at the lower end. The compressed air enters the second annular outer groove of the upper sealing cover from the air inlet joint, enters the first annular outer groove, and is input into the molecular sieve tower along the air inlet groove; At the same time, the air inlet at the upper end of the molecular sieve tower and the oxygen outlet limiting hole at the lower end are opened. When compressed air is input into the molecular sieve tower from the air inlet joint, oxygen is discharged downward through the oxygen outlet limiting hole of the molecular sieve tower due to the entry of pressurized air, and the oxygen enters the oxygen storage cavity of the lower rotary valve body; The air inlet on the upper part of the molecular sieve is connected to the nitrogen exhaust groove of the upper rotary valve body, and the lower oxygen outlet limiting hole is in a closed state. The nitrogen inside the molecular sieve tower is discharged through the air inlet on the upper part of the molecular sieve tower, and the nitrogen is discharged out of the device through the nitrogen exhaust joint of the upper rotary valve body; The air inlet at the upper end of the molecular sieve tower is connected to the nitrogen exhaust groove of the upper rotary valve body, and the oxygen outlet at the lower end is connected to the backflush groove of the lower rotary valve body. Oxygen is discharged from the oxygen storage chamber in the lower rotary valve body through the limiting hole and the backflush groove and enters the molecular sieve tower for purging. The purged nitrogen is discharged through the air inlet at the upper part of the molecular sieve tower and discharged out of the device through the nitrogen exhaust joint.

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