VPSA oxygen generator with negative pressure storage function

Abstract

The utility model discloses a VPSA oxygen generator with a negative pressure storage function. The VPSA oxygen generator comprises a compressor, a molecular sieve A tank body and a molecular sieve B tank body, the compressor is provided with a compressor positive pressure air inlet interface e, a compressor negative pressure air inlet interface h, a compressor negative pressure exhaust interface f and a compressor positive pressure exhaust interface i, direct-acting valves are arranged between the compressor and the molecular sieve A tank body and the molecular sieve B tank body, and each direct-acting valve is provided with an interface j, an interface k, an interface l and an interface m; the compressor positive pressure exhaust interface i is connected with the interface j, the compressor negative pressure air inlet interface h is connected with the interface k, the compressor positive pressure exhaust interface i is connected with the switch valve, the switch valve is provided with an interface b and an interface c, the interface b is connected with the compressor positive pressure exhaust interface i, and the interface c is communicated with the atmosphere. According to the utility model, the hardening problem of the molecular sieve tank when the VPSA oxygen generator operates in a humidity environment is solved, and the problem that the oxygen generation concentration is reduced when the VPSA oxygen generator is stored in the humidity environment for a long time is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen concentrators, and in particular relates to a VPSA oxygen concentrator with a negative pressure storage function. Background Art

[0002] An oxygen generator using the VPSA adsorption principle is generally composed of a compressor, an integrated valve, and two molecular sieve tanks. The output end of the compressor is connected to the input end of the integrated valve, and the two compressed air output ends of the integrated valve are respectively connected to the input ends of the two molecular sieve tanks. The output ends of the two molecular sieve tanks are connected to the oxygen outlet. The integrated valve can control the alternating air intake and exhaust of the two molecular sieve tanks to ensure the output oxygen concentration, and the residual gas at the input end of the molecular sieve tank can be discharged from the exhaust end of the integrated valve.

[0003] During the operation of the oxygen generator, the compressed air of the compressor will carry water vapor into the molecular sieve tank. The water vapor content will be higher in a high humidity environment. In the past, after the water vapor entered the molecular sieve tank of the oxygen generator, part of it would be discharged as the molecular sieve tank was analyzed, but a large amount of water vapor would still remain in the molecular sieve tank. This water vapor would gradually cause the molecular sieve tank to harden, and the oxygen production efficiency would be significantly reduced. In addition, when the oxygen generator is not in operation for a long time, the two sides of the molecular sieve tank of the conventional oxygen generator are also connected to the atmosphere. In this way, as the storage time increases, the molecular sieve tank will gradually absorb moisture in the atmosphere and become hardened, resulting in a low output gas concentration of the oxygen generator, which will eventually reduce the life of the oxygen generator. Utility Model Content

[0004] The utility model aims at the above-mentioned problems, makes up for the deficiencies of the prior art, and provides a VPSA oxygen concentrator with a negative pressure storage function to solve the operation and storage problems of the molecular sieve tank of the VPSA oxygen concentrator in a high humidity environment, thereby ensuring the service life of the molecular sieve tank and ultimately improving the operation life of the VPSA oxygen concentrator.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A VPSA oxygen concentrator with a negative pressure storage function comprises a compressor and a molecular sieve tank, wherein the molecular sieve tank comprises a molecular sieve A tank and a molecular sieve B tank; the compressor is a four-cylinder compressor, the compressor is provided with a compressor positive pressure air intake interface e, a compressor negative pressure air intake interface h, a compressor negative pressure exhaust interface f, and a compressor positive pressure exhaust interface i, a direct-acting valve is arranged between the compressor and the molecular sieve A tank and the molecular sieve B tank, the direct-acting valve is provided with four interfaces, namely, interface j, interface k, interface l, and interface m; the compressor positive pressure exhaust interface Port i is connected to interface j of the direct-acting valve, the negative pressure air intake interface h of the compressor is connected to interface k of the direct-acting valve, the positive pressure exhaust interface i of the compressor is also connected to a switch valve, the switch valve is provided with two interfaces, namely interface b and interface c, interface b of the switch valve is connected to the positive pressure exhaust interface i of the compressor, and interface c of the switch valve is connected to the atmosphere; interface l and interface m of the direct-acting valve are respectively connected to the input ends of the molecular sieve A tank body and the molecular sieve B tank body, the output end of the molecular sieve A tank body is connected to the A check valve, and the output end of the molecular sieve B tank body is connected to the B check valve.

[0007] Furthermore, the output end of the A check valve and the output end of the B check valve are connected to an oxygen storage tank through a pipeline.

[0008] Furthermore, the compressor negative pressure exhaust interface f is connected to an exhaust tank.

[0009] Furthermore, the exhaust tank is an exhaust muffler tank.

[0010] Furthermore, the compressor positive pressure air intake interface e is connected to an air intake filter.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model provides a VPSA oxygen generator with a negative pressure preservation function. On the basis of the VPSA oxygen generation technology, a switch valve with two interfaces connected to a compressor is added, a direct-acting valve with four interfaces connected to the compressor, a molecular sieve A tank body, and a molecular sieve B tank body is added, and an A check valve and a B check valve respectively connected to the output ends of the molecular sieve A tank body and the molecular sieve B tank body are added. When the VPSA oxygen generator is turned off, a negative pressure evacuation operation can be performed on the molecular sieve A tank body and the molecular sieve B tank body of the VPSA oxygen generator at the same time, and negative pressure evacuation can be performed on the molecular sieve A tank body and the molecular sieve B tank body, and the molecular sieve A tank body and the molecular sieve B tank body can be analyzed at the same time, so that the residual water vapor and other gases in the molecular sieve A tank body and the molecular sieve B tank body can be discharged from the molecular sieve A tank body and the molecular sieve B tank body. After the negative pressure pumping is completed, the molecular sieve A tank and the molecular sieve B tank can still maintain a negative pressure state for a long time under the action of the corresponding A check valve and B check valve. This not only solves the problem of molecular sieve tank compaction when the VPSA oxygen generator is running in a high humidity environment, but also solves the problem of reduced oxygen concentration when the VPSA oxygen generator is stored in a high humidity environment for a long time; thereby ensuring the service life of the molecular sieve tank and ultimately increasing the operating life of the VPSA oxygen generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of a VPSA oxygen concentrator with a negative pressure storage function.

[0014] Figure 2 This is one of the working state structural schematic diagrams of a VPSA oxygen concentrator with negative pressure storage function of the utility model.

[0015] Figure 3 This is the second schematic diagram of the working state structure of a VPSA oxygen concentrator with negative pressure storage function of the utility model.

[0016] Figure 4 This is the third schematic diagram of the working state structure of a VPSA oxygen concentrator with negative pressure storage function of the utility model.

[0017] Figure 5 This is the fourth schematic diagram of the working state structure of a VPSA oxygen concentrator with negative pressure storage function of the utility model.

[0018] Markings in the figure: 1. Air intake filter, 2. Compressor, 3. Exhaust tank, 4. Switch valve, 5. Direct-acting valve, 6. Molecular sieve A tank body, 7. Molecular sieve B tank body, 8. A check valve, 9. B check valve, 10. Oxygen storage tank. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Reference Figure 1 , the utility model embodiment provides a VPSA oxygen concentrator with a negative pressure storage function, including a compressor 2 and a molecular sieve tank body, wherein the molecular sieve tank body includes a molecular sieve A tank body 6 and a molecular sieve B tank body 7; the compressor 2 is a four-cylinder compressor, and the compressor 2 is provided with a compressor positive pressure air intake interface e, a compressor negative pressure air intake interface h, a compressor negative pressure exhaust interface f, and a compressor positive pressure exhaust interface i; a direct-acting valve 5 is arranged between the compressor 2 and the molecular sieve A tank body 6 and the molecular sieve B tank body 7, and the direct-acting valve 5 is provided with four interfaces, namely, interface j, interface k, interface l, and interface m; the compressor positive pressure exhaust interface i is connected to the interface j of the direct-acting valve 5, the compressor negative pressure air intake interface h is connected to the interface k of the direct-acting valve 5, and the compressor positive pressure The exhaust interface i is also connected to a switch valve 4, which is provided with two interfaces, namely interface b and interface c. Interface b of the switch valve 4 is connected to the positive pressure exhaust interface i of the compressor, and interface c of the switch valve 4 is connected to the atmosphere; the negative pressure exhaust interface f of the compressor is connected to an exhaust tank 3, and the exhaust tank 3 is an exhaust silencer tank, and the positive pressure air intake interface e of the compressor is connected to an air intake filter element 1; the interface l and interface m of the direct-acting valve 5 are respectively connected to the input ends of the molecular sieve A tank body 6 and the molecular sieve B tank body 7, the output end of the molecular sieve A tank body 6 is connected to an A check valve 8, and the output end of the molecular sieve B tank body 7 is connected to a B check valve 9; the output end of the A check valve 8 and the output end of the B check valve 9 are connected to an oxygen storage tank 10 after being combined through a pipeline.

[0021] Specifically, the VPSA oxygen generator with negative pressure preservation function of the utility model uses a four-cylinder compressor, two cylinders of positive pressure are used as positive pressure adsorption of molecular sieve A tank 6 and molecular sieve B tank 7; two cylinders of negative pressure are used as negative pressure analysis of molecular sieve A tank 6 and molecular sieve B tank 7; a direct-acting valve 5 with four interfaces is used as a key component for alternating oxygen production and analysis of molecular sieve A tank 6 and molecular sieve B tank 7; a switch valve 4 is connected to the positive pressure exhaust interface i end of the compressor, and the other end of the switch valve 4 is connected to the atmosphere.

[0022] In combination with the technical scheme and the attached drawings of the VPSA oxygen concentrator with negative pressure preservation function of the utility model, its working process is described: when the control switch valve 4 is powered off, the interface b and the interface c of the switch valve 4 are not connected, the interface b is the air inlet of the switch valve 4, and the interface c is the air outlet of the switch valve 4; at this time, it is the normal working state of the VPSA oxygen concentrator, the direct-acting valve 5 performs normal oxygen production switching, and the whole machine outputs ≥90% of oxygen. When the VPSA oxygen concentrator is working normally for oxygen production, it performs the alternating operation of the process of equalizing pressure - molecular sieve A tank 6 adsorbs molecular sieve B tank 7 for analysis - equalizing pressure - molecular sieve B tank 7 adsorbs A tank for analysis, such as Figures 2 to 4 As shown, Figures 2 to 4 The figure shows the connection between the interface j, interface k, interface l, and interface m of the direct-acting valve 5 of the VPSA oxygen concentrator during normal oxygen production operation. When the control switch valve 4 is energized, the interface b and interface c of the switch valve 4 are connected. At this time, the compressor positive pressure exhaust interface i of the VPSA oxygen concentrator is connected to the atmosphere and emptied to the atmosphere. When the VPSA oxygen concentrator is shut down, the direct-acting valve 5 is controlled by the logic controller inside the VPSA oxygen concentrator, so that the interface l and interface m of the direct-acting valve 5 are connected to the interface k, and the molecular sieve A tank body 6 and the molecular sieve B tank body 7 are connected to the compressor negative pressure intake interface h of the compressor 2, as shown in FIG. Figure 5 shown.

[0023] When the VPSA oxygen generator is turned off, a set of negative pressure exhaust logic operations is executed through its internal logic controller: the switch valve 4 is kept in a state where the interface b and the interface c are connected, the direct-acting valve 5 is kept in a state where the interface l and the interface m are both connected to the interface k, and the two valves maintain a same cycle of about 20s; thus, at the end of the logic operation, the interior of the molecular sieve A tank 6 and the molecular sieve B tank 7 will reach a negative pressure of about -50Kpa, under which the water vapor in the molecular sieve A tank 6 and the molecular sieve B tank 7 will be analyzed out with the negative pressure exhaust, and discharged to the outside of the molecular sieve A tank 6 and the molecular sieve B tank 7 with the exhaust; after the operation is completed, the compressor 2 is shut down, and the direct-acting valve 5 is powered off; at this time, the molecular sieve A tank 6 and the molecular sieve B tank 7 will form a long-term sealed wall and maintain the negative pressure because the compressor 2 at one end is closed and the A check valve 8 and the B check valve 9 at one end are closed.

[0024] In summary, the utility model can simultaneously perform negative pressure evacuation on the molecular sieve A tank 6 and the molecular sieve B tank 7 of the VPSA oxygen concentrator when the VPSA oxygen concentrator is turned off, and negative pressure evacuation can be performed on the molecular sieve A tank 6 and the molecular sieve B tank 7, and the molecular sieve A tank 6 and the molecular sieve B tank 7 can be analyzed at the same time; the residual water vapor and other gases in the molecular sieve A tank 6 and the molecular sieve B tank 7 can be discharged from the molecular sieve A tank 6 and the molecular sieve B tank 7. After the negative pressure evacuation is completed, the molecular sieve A tank 6 and the molecular sieve B tank 7 can still maintain a negative pressure state for a long time under the action of the A check valve 8 and the B check valve 9 connected to them, which not only solves the problem of the molecular sieve tank body hardening when the VPSA oxygen concentrator is running in a high humidity environment, but also solves the problem of the oxygen concentration being reduced when the VPSA oxygen concentrator is stored in a high humidity environment for a long time; thereby ensuring the service life of the molecular sieve tank, and ultimately improving the operating life of the VPSA oxygen concentrator.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A VPSA oxygen concentrator with negative pressure storage function, comprising a compressor and a molecular sieve tank, wherein the molecular sieve tank comprises a molecular sieve A tank and a molecular sieve B tank; characterized in that: The compressor is a four-cylinder compressor, and is provided with a compressor positive pressure air intake interface e, a compressor negative pressure air intake interface h, a compressor negative pressure exhaust interface f, and a compressor positive pressure exhaust interface i. A direct-acting valve is arranged between the compressor and the molecular sieve A tank body and the molecular sieve B tank body. The direct-acting valve is provided with four interfaces, namely interface j, interface k, interface l, and interface m; the compressor positive pressure exhaust interface i is connected to the interface j of the direct-acting valve, the compressor negative pressure air intake interface h is connected to the interface k of the direct-acting valve, the compressor positive pressure exhaust interface i is also connected to a switch valve, the switch valve is provided with two interfaces, namely interface b and interface c, the interface b of the switch valve is connected to the compressor positive pressure exhaust interface i, and the interface c of the switch valve is connected to the atmosphere; the interface l and the interface m of the direct-acting valve are respectively connected to the input ends of the molecular sieve A tank body and the molecular sieve B tank body, the output end of the molecular sieve A tank body is connected to the A check valve, and the output end of the molecular sieve B tank body is connected to the B check valve.

2. A VPSA oxygen concentrator with negative pressure storage function according to claim 1, characterized in that: The output end of the A check valve and the output end of the B check valve are connected to an oxygen storage tank through a pipeline.

3. The VPSA oxygen concentrator with negative pressure storage function according to claim 1, characterized in that: The compressor negative pressure exhaust interface f is connected to an exhaust tank.

4. A VPSA oxygen concentrator with negative pressure storage function according to claim 3, characterized in that: The exhaust tank is an exhaust muffler tank.

5. The VPSA oxygen concentrator with negative pressure storage function according to claim 1, characterized in that: The compressor positive pressure air inlet interface e is connected with an air inlet filter element.

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