Low-temperature preheating type oxygen generator

Abstract

The utility model relates to the technical field of oxygen generators, in particular to a low-temperature preheating type oxygen generator which comprises a shell, an adsorption barrel, a temperature sensor, a controller, a compressor, a gas inlet pipeline and a gas distribution valve assembly. The controller is in signal connection with the compressor, the temperature sensor and the gas distribution valve assembly, the temperature sensor detects the temperature of the adsorption cylinder, the controller receives a temperature value fed back by the temperature sensor and controls opening and closing of the gas distribution valve assembly, and when the temperature is smaller than T, the controller controls the compressor to input pressurized hot gas into the adsorption cylinder; the ventilation port of the gas distribution valve assembly is partially opened and closed to circularly heat and exhaust the adsorption cylinder, so that the temperature of the adsorption cylinder is increased; when the temperature is larger than or equal to T, the controller controls the compressor and the gas distribution valve assembly to input pressurized gas into the adsorption barrel, and pressure swing adsorption oxygen production is conducted. On the premise that a heater is not additionally arranged, the temperature of the adsorption barrel in the low-temperature environment is increased, then the adsorption and desorption performance of an adsorbent is improved, and the oxygen generation performance of the oxygen generator is conveniently improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen concentrators, in particular to a low-temperature preheating type oxygen concentrator. Background Art

[0002] As people pay more attention to oxygen therapy, portable oxygen concentrators are favored by more and more oxygen users. There are many ways to produce oxygen for oxygen concentrators, among which the most common is pressure swing adsorption oxygen production. The principle of pressure swing adsorption oxygen production is to use the selective adsorption characteristics of the adsorbent, adopt a cycle of pressurized adsorption and decompression desorption, so that compressed air alternately enters the adsorption cylinder to achieve air separation, thereby producing high-purity product oxygen.

[0003] When the oxygen generator is outdoors in the plateau or in winter, the performance of the adsorbent often decreases due to the low ambient temperature, which affects the oxygen production performance of the entire oxygen generator and cannot meet the oxygen needs of oxygen users.

[0004] In the prior art, in order to improve the performance of the adsorbent in a low-temperature environment, a common method is to add a heater in the adsorption cylinder to achieve the purpose of improving the performance of the adsorbent by heating the heater. However, after adding a heater in the adsorption cylinder, if the same amount of adsorbent needs to be filled, the volume of the adsorption cylinder needs to be increased. In an era of increasing pursuit of miniaturization, increasing the volume of the adsorption cylinder is not conducive to the miniaturization of the oxygen generator; if the volume of the adsorption cylinder is not increased, the oxygen production of the adsorbent may be reduced, and the user's oxygen demand cannot be met.

[0005] Therefore, it is necessary to provide a preheating oxygen generator that can improve the performance of the adsorbent in a low-temperature environment without adding a heater, which can not only enable the adsorbent to reach a more suitable operating temperature and improve the performance of the adsorbent, thereby achieving the purpose of improving the oxygen production performance, but also meet the user's demand for miniaturization of the oxygen generator. Utility Model Content

[0006] In view of the above deficiencies in the prior art, the utility model provides a low-temperature preheating oxygen concentrator. Without adding a heater, the controller controls the compressor and the gas distribution valve assembly to transport the pressurized hot gas generated by the compressor to the adsorption cylinder for cyclic heating and exhaust, thereby achieving the purpose of increasing the temperature of the adsorbent in the adsorption cylinder, which is beneficial to improving the adsorption and desorption performance of the adsorbent, thereby improving the oxygen production performance of the oxygen concentrator without increasing the volume of the oxygen concentrator, and meeting the user's oxygen demand and the demand for miniaturization of the oxygen concentrator.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] The utility model provides a low-temperature preheating oxygen concentrator, comprising:

[0009] case;

[0010] An adsorption cylinder is arranged adjacent to the shell, and comprises an air inlet end and an air outlet end. The adsorption cylinder is filled with an adsorbent for adsorbing nitrogen to produce oxygen;

[0011] A temperature sensor is arranged inside the adsorption cylinder, or arranged on the outer surface of the adsorption cylinder, and is used to detect the temperature of the adsorption cylinder;

[0012] A controller, for receiving a signal and generating a control signal;

[0013] A compressor is disposed inside the housing, operates in response to a control signal from the controller, and provides pressurized air to the adsorption cylinder;

[0014] An air inlet pipeline is provided between the compressor and the adsorption cylinder and is used to deliver the pressurized gas generated by the compressor to the adsorption cylinder;

[0015] A gas distribution valve assembly is arranged at the upper end of the shell, or at the upper end of the adsorption cylinder, and includes an air inlet, an air outlet and an exhaust port, wherein the air inlet is connected to the rear end of the air inlet pipeline, the air outlet is connected to the air inlet end of the adsorption cylinder, and the exhaust port is used to discharge the gas output from the air inlet end of the adsorption cylinder;

[0016] The controller is respectively connected to the compressor, the temperature sensor and the gas distribution valve assembly by signal. The controller receives the temperature value fed back by the temperature sensor and controls the opening and closing of the gas distribution valve assembly according to the temperature value.

[0017] When the temperature of the adsorption cylinder is lower than T, the oxygen concentrator enters the low-temperature preheating stage, the controller controls the compressor to input pressurized hot gas to the adsorption cylinder, and controls at least part of the vents of the gas distribution valve assembly to open, so as to transport the pressurized hot gas generated by the compressor to the adsorption cylinder for cyclic heating and exhaust of the adsorption cylinder, thereby increasing the working temperature of the adsorbent;

[0018] When the temperature of the adsorption cylinder is higher than or equal to T, the oxygen generator enters the normal temperature oxygen production stage, the controller controls the compressor to input pressurized gas into the adsorption cylinder, and controls the gas distribution valve assembly to open the air inlet and the air outlet to input pressurized gas into the adsorption cylinder during pressurization, and open the air outlet and the exhaust port to discharge nitrogen from the adsorption cylinder during decompression and desorption.

[0019] Furthermore, there are two adsorption cylinders, and the temperature sensors correspond to the number of adsorption cylinders one by one. When the temperature of any adsorption cylinder is lower than T, the oxygen generator enters the low-temperature preheating stage, and the controller controls the compressor to input pressurized hot gas to the adsorption cylinder to heat and exhaust the adsorption cylinder.

[0020] Furthermore, the gas distribution valve assembly includes two independent inlet and exhaust valves, the inlet and exhaust valves are two-position three-way valves, including an inlet, an outlet and an exhaust port, the inlet is connected to the outlet gas path, the exhaust port is connected to the outlet gas path, and each inlet and exhaust valve corresponds to an adsorption cylinder;

[0021] or,

[0022] The gas distribution valve assembly is an integrated valve, including an air inlet, an exhaust port and two air outlets, and each air outlet corresponds to the air inlet end of an adsorption cylinder, the air inlet is connected to both air outlets by air paths, and the exhaust port is also connected to both air outlets by air paths.

[0023] Further, the air intake pipeline includes a first air intake pipeline and a second air intake pipeline, and a heat dissipation pipe is arranged on the second air intake pipeline;

[0024] During low-temperature preheating, the gas is transported to the adsorption cylinder through the first air inlet pipeline. During normal-temperature oxygen production, the gas is transported to the adsorption cylinder through the second air inlet pipeline.

[0025] Furthermore, a hole is provided on one side of the shell close to the adsorption cylinder, and a shielding portion is movably provided at a position inside the shell corresponding to the hole, and an area of ​​the shielding portion is greater than or equal to an area of ​​the hole. When the shielding portion completely covers the hole, the hole can be blocked.

[0026] Furthermore, it also includes a fan, which is arranged on the shell and located above the compressor, and operates in response to a control signal of the controller; during low-temperature preheating, the controller controls the fan to be turned off, and during normal-temperature oxygen production, the controller controls the fan to be turned on.

[0027] Furthermore, the fan is a centrifugal fan, the air inlet of the centrifugal fan corresponds to the air inlet pipeline, and the air outlet of the centrifugal fan is arranged directly above the compressor.

[0028] Furthermore, it also includes an air circuit regulating device, which is arranged between the compressor and the air intake pipeline and is used to control the opening and closing of the first air intake pipeline and the second air intake pipeline.

[0029] Furthermore, a tee piece is provided between the air intake pipeline and the gas distribution valve assembly, and the first and second air intake pipelines are connected to the gas distribution valve assembly through the tee piece.

[0030] Furthermore, a drying device is provided between the three-way piece and the gas distribution valve assembly.

[0031] The utility model has the following beneficial effects: the utility model arranges a temperature sensor inside or on the outer surface of the adsorption cylinder to detect the temperature value of the adsorption cylinder. In a low-temperature environment, the controller controls the compressor to input pressurized hot gas into the adsorption cylinder, and controls the opening and closing of the vent portion of the gas distribution valve assembly to realize cyclic heating and exhaust of the adsorbent in the adsorption cylinder, thereby improving the adsorption and desorption efficiency of the adsorbent, thereby improving the oxygen production efficiency of the oxygen generator, which is beneficial to meeting the oxygen demand of users; without adding a heater, the preheating of the adsorbent in the adsorption cylinder in a low-temperature environment is realized through simple piping and control of the valve. The structural setting is simple and convenient, which can achieve the effect of reducing costs and increasing efficiency. In addition, the utility model does not increase the volume of the oxygen generator, which is beneficial to meeting the user's demand for a miniaturized oxygen generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a simple flow chart of an embodiment provided by the utility model;

[0033] Figure 2 It is a flow chart of another embodiment provided by the utility model;

[0034] Figure 3 It is a schematic diagram of part of the internal structure of the oxygen concentrator in the embodiment provided by the utility model;

[0035] Figure 4 yes Figure 3 Top view of the .

[0036] In the figure, 1, compressor 2, adsorption cylinder 21, temperature sensor 3, gas distribution valve assembly 4, fan 5, controller 6, air intake pipeline 61, first air intake pipeline 62, second air intake pipeline 7, heat dissipation pipe 8, air path regulating device 9, tee piece 10, shell 20, oxygen production assembly. DETAILED DESCRIPTION

[0037] The utility model is further described below in conjunction with the accompanying drawings.

[0038] Example:

[0039] like Figures 1 to 4 As shown, the low-temperature preheating oxygen concentrator described in the utility model solves the problem that the adsorption and desorption performance of the adsorbent decreases in a low-temperature environment, resulting in unsatisfactory oxygen production performance of the oxygen concentrator and inability to meet the oxygen demand of oxygen-demanding users, without adding a heater.

[0040] The low-temperature preheating oxygen concentrator includes a shell 10, an adsorption cylinder 2, a temperature sensor 21, a controller 5, a compressor 1, an air intake pipeline 6 and a gas distribution valve assembly 3. The temperature sensor 21 is arranged inside or on the outer surface of the adsorption cylinder 2, so that the temperature sensor 21 monitors the temperature of the adsorption cylinder 2. The controller 5 receives the temperature value fed back by the temperature sensor 21. When the temperature value is less than T, the controller 5 controls the compressor 1 to input pressurized hot gas to the adsorption cylinder 2 through the air intake pipeline 6, and controls some air vents of the gas distribution valve assembly 3 to be connected to perform cyclic air intake and exhaust actions, thereby realizing cyclic heating and exhaust of the adsorption cylinder 2, so as to increase the working temperature of the adsorbent in the adsorption cylinder 2, thereby improving the adsorption and desorption performance of the adsorbent.

[0041] The adsorption cylinder 2 is disposed adjacent to the housing 10. In one embodiment, Figure 3 As shown, the adsorption cylinder 2 is detachably connected to the short side of the shell 10. The adsorption cylinder 2 includes an air inlet end and an air outlet end. The adsorption cylinder 2 is filled with an adsorbent for adsorbing nitrogen to produce oxygen. In one embodiment, the adsorbent can be a zeolite molecular sieve. The zeolite molecular sieve has a good adsorption capacity for nitrogen molecules under high pressure, and can desorb a large amount of nitrogen to reduce the zeolite molecular sieve when the pressure is reduced, and has a good oxygen production performance.

[0042] The temperature sensor 21 is used to detect the temperature value of the adsorption cylinder 2. In one embodiment (not shown in the figure), in order to improve the detection effect, the temperature sensor 21 is arranged inside the adsorption cylinder 2; in another embodiment (not shown in the figure), in order to prevent the temperature sensor 21 from being arranged inside the adsorption cylinder 2 and occupying the internal volume of the adsorption cylinder 2, thereby affecting the content of the adsorbent in the adsorption cylinder 2, the adsorption cylinder 2 is an aluminum cylinder, and aluminum has good thermal conductivity. The temperature sensor 21 is arranged on the outer surface of the adsorption cylinder 2. The heat inside the adsorption cylinder 2 can be transferred to the temperature sensor 21 on the outer surface of the adsorption cylinder 2, and the temperature value of the adsorption cylinder 2 can also be detected. Preferably, the temperature sensor 21 can be arranged on the side of the adsorption cylinder 2 away from its air inlet end, so as to detect the temperature value of the rear end of the adsorption cylinder 2 (in the present embodiment, the side close to the air inlet end of the adsorption cylinder 2 is the front end, and the side close to the air outlet end of the adsorption cylinder 2 is the rear end). Since the compressed gas enters the interior of the adsorption cylinder 2 from the air inlet end of the adsorption cylinder 2, during low-temperature preheating, there is heat consumption in the process of the pressurized hot gas being transported from the front end to the rear end of the adsorption cylinder 2. The front end temperature of the adsorption cylinder 2 is ≥ the rear end temperature of the adsorption cylinder 2. Therefore, the temperature sensor 21 is arranged near the rear end of the adsorption cylinder 2 to detect the temperature value of the rear end of the adsorption cylinder 2. When the adsorbent at the rear end of the adsorption cylinder 2 reaches the appropriate working temperature, the adsorbent at its front end has met the temperature. Therefore, the temperature sensor 21 is arranged at the rear end of the adsorption cylinder 2 to facilitate the overall grasp of the internal temperature value of the adsorption cylinder 2. When the rear end temperature value is detected to be ≥T, the front end temperature value is also ≥T, which makes the detection result more accurate and facilitates the control of the working temperature of the adsorbent in the adsorption cylinder 2.

[0043] The controller 5 is used to receive signals and generate control signals. Specifically, the controller 5 is respectively connected to the compressor 1, the temperature sensor 21 and the gas distribution valve assembly 3. The controller 5 receives the temperature value fed back by the temperature sensor 21, controls the compressor 1 to produce compressed gas, and controls the opening and closing of some air vents of the gas distribution valve assembly 3 to control the air intake and exhaust actions of the gas distribution valve assembly 3.

[0044] The compressor 1 is arranged inside the shell 10, responds to the control signal of the controller 5, and delivers the compressed gas it produces to the adsorption cylinder 2, transfers heat to the adsorbent in the adsorption cylinder 2 or makes it produce oxygen by pressure swing adsorption at a suitable temperature. By setting up the shell 10, the heat dissipation of the compressor 1 can be reduced, so that the compressor 1 can heat up quickly during the low-temperature preheating stage, which is conducive to the generation of heated gas; at the same time, the shell 10 separates the compressor 1 from other components of the oxygen concentrator, which is conducive to reducing the transmission of the working noise of the compressor 1, so as to reduce the impact of noise transmission on users.

[0045] The air intake pipeline 6 is disposed between the compressor 1 and the adsorption cylinder 2 , and is used to transport the pressurized gas generated by the compressor 1 to the adsorption cylinder 2 .

[0046] In one embodiment, the gas distribution valve assembly 3 is disposed at the upper end of the housing 10, and may be, for example, Figure 3 As shown, the gas distribution valve assembly 3 is arranged on the top of the shell 10, close to the side of the adsorption cylinder 2, and is detachably connected to the shell 10 by threaded connection; or, the gas distribution valve assembly 3 is arranged at the upper end of the adsorption cylinder 2, which is not shown in the figure. Specifically, the gas distribution valve assembly 3 is detachably connected to the top of the adsorption cylinder 2. The gas distribution valve assembly 3 includes an air inlet, an air outlet and an exhaust port. The air inlet is connected to the rear end of the air inlet pipeline 6, the air outlet is connected to the air inlet end of the adsorption cylinder 2, and the exhaust port is used to discharge the gas output from the air inlet end of the adsorption cylinder 2. In one embodiment (not shown in the figure), the other end of the exhaust port is connected to the exhaust muffler to reduce the exhaust noise.

[0047] Specifically, Figure 1 As shown, the oxygen generator is turned on, the temperature sensor 21 detects the temperature value of the adsorption cylinder 2 and feeds it back to the controller 5, the controller 5 receives the temperature value transmitted by the temperature sensor 21, when the temperature value is less than T, the oxygen generator enters the low-temperature preheating stage, the controller 5 controls the compressor 1 to transmit pressurized hot gas to the adsorption cylinder 2 through the air inlet pipeline 6, and controls at least part of the air vents of the gas distribution valve assembly 3 to be opened, for example, the controller 5 controls the air inlet and the air outlet to be connected, and the pressurized hot gas generated by the compressor 1 is transmitted to the adsorption cylinder 2, the duration t1S allows the pressurized hot gas to fill the adsorption cylinder 2, and part of the gas is output from the air outlet, that is, the pressurized hot gas is The gas is transmitted from the front end to the rear end to heat the adsorbent, and then the controller 5 controls the gas outlet to be connected with the exhaust port to exhaust the gas in the adsorption cylinder 2 by using the pressure difference, and continues for t2S so that a large amount of gas that has undergone heat exchange is discharged from the exhaust port. The controller 5 controls the opening and closing of at least part of the air vents of the compressor 1 and the gas distribution valve assembly 3 to cyclically heat and exhaust the adsorption cylinder 2. Without adding a heater, the heat generated by the compressor 1 is used to exchange heat with the adsorption cylinder 2, thereby increasing the working temperature of the adsorbent in the adsorption cylinder 2, which is beneficial to increasing the oxygen concentration of the oxygen generator and meeting the oxygen demand of users.

[0048] When the temperature value is ≥T, the oxygen generator enters the normal temperature oxygen production stage, and the controller 5 controls the compressor 1 to deliver pressurized gas to the adsorption cylinder 2, and controls the gas distribution valve assembly 3 to connect the air inlet and the air outlet when the adsorbent is pressurized and adsorbed, so that the gas is input into the adsorption cylinder 2 through the gas distribution valve assembly 3 to produce oxygen, and the adsorbent adsorbs nitrogen, and the oxygen is output from the air outlet for users to use; when the adsorbent is decompressed and desorbed, the controller 5 controls the air outlet and the exhaust port of the gas distribution valve assembly 3 to be connected, and the nitrogen is discharged from the adsorption cylinder 2, and the adsorbent is restored and regenerated to prepare for the next pressurized adsorption.

[0049] In order to meet the oxygen demand of the user and improve the oxygen concentration, the number of adsorption cylinders 2 can be two, and the two adsorption cylinders 2 are filled with adsorbent, and the oxygen production performance is improved by increasing the content of the adsorbent. In one embodiment, the number of adsorption cylinders 2 is two, and the two adsorption cylinders 2 can be set independently or integrated together, such as Figure 3 As shown, two adsorption cylinders 2 are integrated with the oxygen storage tank on the oxygen production component 20, and the two adsorption cylinders 2 are respectively located on both sides of the oxygen storage tank. The oxygen output from the air outlet of the adsorption cylinder 2 can be temporarily stored in the gas storage tank. The temperature sensors 21 correspond to the number of adsorption cylinders 2 one by one, that is, the number of temperature sensors 21 is also two, and each temperature sensor 21 corresponds to an adsorption cylinder 2. If the controller 5 receives a temperature <T of the adsorption cylinder 2 corresponding to any one of the temperature sensors 21, the oxygen generator enters the low-temperature preheating stage, and the controller 5 controls the compressor 1 to input pressurized hot gas into the two adsorption cylinders 2, and controls the vent portion of the gas distribution valve assembly 3 to be opened, so as to heat and exhaust the two adsorption cylinders 2 respectively.

[0050] During the low-temperature preheating stage, the controller 5 controls the compressor 1 to input pressurized hot gas into the two adsorption cylinders 2 to increase the temperature inside the two adsorption cylinders 2. There are two situations. For example, the controller 5 controls the compressor 1 to input pressurized hot gas into the two adsorption cylinders 2 at the same time, heats and exhausts the two adsorption cylinders 2 at the same time, and increases the working temperature of the adsorbent, so that it has better adsorption and desorption performance; furthermore, the controller 5 can control the compressor 1 to input pressurized hot gas into the two adsorption cylinders 2 in sequence, such as, when the adsorption cylinder A is heated, the adsorption cylinder B is exhausted, when the heating of the adsorption cylinder A is completed and the exhaust is performed, the adsorption cylinder B is heated, so that the two adsorption cylinders 2 cyclically perform heating and exhaust actions until the two temperature sensors 21 detect that the temperature values ​​of the two adsorption cylinders 2 are both ≥T, ending the low-temperature preheating stage and entering the normal temperature oxygen production stage.

[0051] To facilitate the assembly and use of the gas distribution valve assembly 3, in one embodiment (not shown in the figure), the gas distribution valve assembly 3 includes two independent inlet and exhaust valves, and the inlet and exhaust valves are two-position three-way valves, including an air inlet, an air outlet and an exhaust port, wherein the air inlet is connected to the air outlet gas path, and the air outlet is connected to the air outlet gas path, and each inlet and exhaust valve corresponds to an adsorption cylinder 2. In a specific application, the air intake pipeline 6 can be connected to the air inlets of the two inlet and exhaust valves through a three-way piece, respectively, and the air outlets of the two inlet and exhaust valves are connected to the air inlet ends of the two adsorption cylinders 2 respectively, and the two exhaust ports are connected to the exhaust muffler through a three-way piece for discharging the gas output from the air inlet end of the adsorption cylinder 2. Through the setting of the two inlet and exhaust valves, the controller 5 can control the compressor 1 to simultaneously input pressurized hot gas to the adsorption cylinder 2 through the two inlet and exhaust valves to heat the two adsorption cylinders 2, and can also heat the adsorption cylinder A and the adsorption cylinder B in sequence.

[0052] In another embodiment, Figures 3-4 As shown, in order to save space and make the oxygen generator as small as possible, the gas distribution valve assembly 3 is an integrated valve, which includes an air inlet, two air outlets and an exhaust port. The two air outlets of the valve correspond to the air inlet ends of the two adsorption cylinders 2 respectively, the air inlet is connected to the two air outlets in an air path, and the exhaust port is also connected to the two air outlets in an air path.

[0053] In the low-temperature preheating stage, the integrated valve can heat the adsorption cylinder A and the adsorption cylinder B in turn. For example, the compressor 1 inputs pressurized hot gas into the adsorption cylinder A through the air inlet and the air outlet A of the gas distribution valve assembly 3. When the adsorption cylinder A is heated, the air outlet B and the exhaust port of the gas distribution valve assembly 3 are connected to the outside world to exhaust the adsorption cylinder B; when the adsorption cylinder B is heated, the adsorption cylinder A is exhausted. When the controller 5 receives the temperature values ​​of the two adsorption cylinders 2 fed back by the temperature sensor 21 and both are ≥T, the oxygen generator completes the low-temperature preheating and enters the normal temperature oxygen production stage. In addition, the integrated valve can also heat the adsorption cylinder A and the adsorption cylinder B at the same time, and then exhaust the adsorption cylinder A and the adsorption cylinder B at the same time after the heating is completed. After multiple cycles of heating and exhausting, the temperature of the adsorption cylinder 2 is increased, and the working temperature of the adsorbent in the adsorption cylinder 2 is increased to increase the adsorption and desorption performance of the adsorbent.

[0054] In this application, the compressed gas generated by the compressor 1 has two main uses: one is to heat the adsorbent in the adsorption cylinder 2 to increase the working temperature of the adsorbent so that it can produce better adsorption and desorption performance; the other is to input pressurized gas into the adsorption cylinder 2 to facilitate the adsorbent in the cylinder to perform pressure swing adsorption oxygen production to meet the user's oxygen demand. In order to distinguish the two different uses of compressed gas, in one embodiment, Figure 3 As shown, the air intake pipeline 6 includes a first air intake pipeline 61 and a second air intake pipeline 62, and a heat dissipation pipe 7 is provided on the second air intake pipeline 62. During low-temperature preheating, the compressed gas generated by the compressor 1 is transported to the adsorption cylinder 2 through the first air intake pipeline 61 for heating and exhaust, so as to increase the working temperature of the adsorbent in the adsorption cylinder 2; during normal temperature oxygen production, the gas is transported to the adsorption cylinder 2 through the second air intake pipeline 62 for pressure swing adsorption oxygen production. By providing the heat dissipation pipe 7 on the second air intake pipeline 62, the compressed gas output by the compressor 1 can be dissipated during oxygen production, thereby reducing the continuous increase in the temperature in the adsorption cylinder 2 and affecting the adsorption and desorption effects of the adsorbent.

[0055] In order to facilitate the heating of the adsorption cylinder 2 in a low temperature environment, a hole is provided on one side of the shell 10 near the adsorption cylinder 2. The shape and number of the hole are not limited. The heat generated by the compressor 1 when working can be transferred to the adsorption cylinder 2 through the hole, which is convenient for heating the adsorption cylinder 2. In order to reduce the transfer of the hot air generated by the compressor 1 to the adsorption cylinder 2 when the oxygen concentrator is producing oxygen at room temperature, a shielding part is also movably provided inside the shell 10 at a position opposite to the hole. The area of ​​the shielding part is greater than or equal to the area of ​​the hole. When the shielding part moves to the hole and completely covers the hole, the hole can be blocked. In one embodiment (not shown in the figure), the shielding part is controlled by the electromagnetic valve, and the electromagnetic valve is connected to the controller 5 by signal. In the low temperature preheating stage, the controller 5 controls the electromagnetic valve to open the shielding part, and the hot air generated by the compressor 1 when working can be transferred to the outer surface of the adsorption cylinder 2 through the hole to heat the adsorption cylinder 2; in the normal temperature oxygen production stage, the controller 5 controls the electromagnetic valve to close the shielding part, block the hole, and reduce the transmission of heat and noise in the shell 10.

[0056] In order to facilitate the heat dissipation of the compressor during the normal temperature oxygen production stage and prevent the compressor temperature from being too high and affecting other components in the oxygen concentrator, such as Figure 3 As shown, the oxygen concentrator further includes a fan 4, which is arranged above the shell 10. In one embodiment, the fan 4 is threadedly connected to the shell 10. Further, the fan 4 is located above the compressor 1 to dissipate heat for the compressor 1. The fan 4 operates in response to a control signal of the controller 5. In the low-temperature preheating stage, the controller 5 controls the fan 4 to be turned off, and there is no need to dissipate heat for the compressor 1, thereby reducing the heat loss in the shell 10. In the normal temperature oxygen production stage, the controller 5 controls the fan 4 to be turned on to dissipate heat for the compressor 1.

[0057] In order to enable the fan 4 to dissipate heat from the air intake pipe 6 during the normal temperature oxygen production stage, Figure 3 As shown, the fan 4 is a centrifugal fan, the air inlet of the centrifugal fan corresponds to the air inlet pipeline 6, and the air outlet is arranged directly above the compressor 1. When the centrifugal fan is turned on, the air flow path is as follows: after the cold air from the outside enters the interior of the oxygen concentrator, it first passes through the outer surface of the air inlet pipeline 6 to dissipate the heat of the outer surface of the air inlet pipeline 6, and then is sucked into the air inlet of the centrifugal fan, and then blows toward the compressor 1 from the air outlet to dissipate the heat of the compressor 1. During the air flow process, the compressor 1 can be cooled and part of the heat of the air inlet pipeline 6 can be taken away.

[0058] In one embodiment, Figures 2-3As shown, in order to reduce the cluttered arrangement of pipelines, the oxygen concentrator also includes an air circuit regulating device 8, which is arranged between the compressor 1 and the air intake pipeline 6. The air circuit regulating device 8 can be a two-position three-way valve, the first interface is connected to the compressor 1, the second and third interfaces are respectively connected to the first air intake pipeline 61 and the second air intake pipeline 62, the air circuit regulating device 8 is arranged on the shell 10, the gas output by the compressor 1 is connected to the first interface of the air circuit regulating device 8 through the ventilation pipe, and is transported from the first interface to the second interface or the third interface, and then connected to the air intake pipeline 6 and transported to the adsorption cylinder 2. The air circuit regulating device 8 is connected to the controller 5 signal, and the controller 5 controls the on-off of the first air intake pipeline 61 and the second air intake pipeline 62 through the air circuit regulating device 8.

[0059] In order to further reduce the complicated piping settings and make the internal structure of the oxygen generator more concise and clear, such as Figures 2-3 As shown, a tee piece 9 is provided between the air intake pipeline 6 and the gas distribution valve assembly 3, and the first and second air intake pipelines are connected to the gas distribution valve assembly 3 through the tee piece 9. In one embodiment, as Figure 4 As shown, the gas distribution valve assembly 3, the gas circuit regulating device 8 and the three-way piece 9 are all arranged on the shell 10, the gas circuit regulating device 8 is arranged on one side of the shell 10, the gas distribution valve assembly 3 and the three-way piece 9 are arranged on the side opposite to the gas circuit regulating device 8 and are arranged close to the adsorption cylinder 2, and the first and second air inlet pipelines are output from the second and third interfaces of the gas circuit regulating device 8, and are arranged in parallel above the shell 10, and are finally connected to the three-way piece 9, and the other end of the three-way piece 9 is connected to the air inlet of the gas distribution valve assembly 3, so as to facilitate the gas transportation of the first air inlet pipeline 61 or the second air inlet pipeline 62.

[0060] In order to prevent moisture from entering the adsorption cylinder 2 and affecting the adsorption and desorption performance of the adsorbent, in one embodiment (not shown in the figure), a drying device is provided between the three-way piece 9 and the gas distribution valve assembly 3 to prevent moisture from entering the adsorption cylinder 2.

[0061] In a specific embodiment, Figures 3-4As shown, a shell 10 is provided on the base of the oxygen concentrator, and a compressor 1 is provided inside the shell 10 to prevent the heat generated by the compressor 1 from overflowing when it is working. An oxygen production component 20 is provided on the side adjacent to the shell 10. The oxygen production component 20 is integrated with two adsorption cylinders 2 and an oxygen storage tank, which is conducive to the miniaturization of the oxygen concentrator. A temperature sensor 21 is provided in each adsorption cylinder 2 to detect the temperature value of each adsorption cylinder 2 and feed it back to the controller 5. The shell 10 is also provided with components such as a gas distribution valve assembly 3, a fan 4, an air circuit regulating device 8 and a three-way piece 9. A first air intake pipeline 61 and a second air intake pipeline 62 are provided between the air circuit regulating device 8 and the three-way piece 9. A heat dissipation pipe 7 is provided on the second air intake pipeline 62. The controller 5 is connected to the temperature sensor 21, the compressor 1, the gas distribution valve assembly 3 and the air circuit regulating device 8 by signal.

[0062] In this embodiment, the optimal working temperature of the adsorbent used is 10°C to 30°C. When the temperature sensor 21 detects that the temperature of the adsorption cylinder 2 is lower than 10°C, the oxygen concentrator enters the low-temperature preheating stage. When the temperature value is greater than or equal to 10°C, it enters the normal-temperature oxygen production stage. Since the oxygen concentration in the gas in the low-temperature preheating stage of the oxygen concentrator is low, the gas in the startup preheating stage cannot meet the oxygen demand of oxygen-demanding users, and it can be considered to be directly discarded. When the oxygen concentrator enters the normal-temperature oxygen production stage, it is transmitted to the user's oxygen demand end through the nasal oxygen tube.

[0063] When the oxygen generator is turned on, the two temperature sensors 21 respectively detect the temperature values ​​of the two adsorption cylinders 2, the controller 5 receives the temperature values ​​fed back by the temperature sensors 21, and controls the compressor 1 to produce compressed gas. When the temperature values ​​fed back by the two temperature sensors 21 received by the controller 5 are both -15°C, since -15°C is lower than 10°C, the gas circuit regulating device 8 is controlled to open the second interface to connect to the first air inlet pipeline 61, and the compressed hot gas generated by the compressor 1 passes through the connecting gas path of the first interface and the second interface of the gas circuit regulating device 8, and then passes through the first air inlet pipe 61 and the three-way piece 9 to be transported to the gas distribution valve assembly 3. The gas distribution valve assembly 3 is an integrated valve, including an air inlet, two air outlets and an exhaust port. The three-way piece 9 is connected to the air inlet of the gas distribution valve assembly 3, and the two air outlets are respectively connected to the air inlet ends of the two adsorption cylinders 2, and the exhaust port is connected to the exhaust port. The silencer is connected. In this embodiment, the controller 5 controls the pressurized hot gas to pass through the air inlet of the gas distribution valve assembly 3 and then connect to the air inlet ends of the two adsorption cylinders 2 respectively, and at the same time inputs the pressurized hot gas into the two adsorption cylinders 2 to heat the internal adsorbent thereof, which lasts for 6S. The air outlet of the adsorption cylinder 2 is connected to the one-way throttle valve, and part of the gas is output from the one-way throttle valve; then the controller 5 controls the two air outlets of the gas distribution valve assembly 3 to be connected to the exhaust port at the same time, and the gas after heat exchange in the two adsorption cylinders 2 is discharged from the exhaust port to exhaust the two adsorption cylinders 2, which lasts for 2S; if the temperature value output by the temperature sensor 21 received by the controller 5 is still less than 10°C at this time, the two adsorption cylinders 2 are heated and exhausted again at the same time, until the temperature values ​​received by the controller 5 for the two adsorption cylinders 2 are both greater than or equal to 10°C, and the oxygen generator enters the normal temperature oxygen production stage.

[0064] When the two temperature sensors 21 detect that the temperature values ​​of the two adsorption cylinders 2 are both greater than or equal to 10°C, the oxygen generator enters the normal temperature oxygen production stage, the controller 5 controls the compressor 1 to produce compressed gas, and controls the gas path regulating device 8 to connect the second air inlet pipeline 62 through the third interface, and delivers the compressed gas to the adsorption cylinder 2 through the second air inlet pipeline 62 for pressure swing adsorption oxygen production. The second air inlet pipeline 62 is provided with a radiator 7, which can dissipate the heat of the gas output by the compressor 1; further, the controller 5 controls the fan 4 to turn on, where the fan 4 can be a centrifugal fan, when the external cold air flow passes through the second air inlet pipeline 62 and is sucked into the air inlet of the centrifugal fan, it can take away part of the heat, and the air outlet of the centrifugal fan is located directly above the compressor 1, which is convenient for dissipating the heat of the compressor 1. The process of pressure swing adsorption oxygen production of the oxygen generator is a conventional setting and will not be repeated in this application.

[0065] In summary, the low-temperature preheating oxygen concentrator provided in the present application, under the premise of not adding a heater, in a low-temperature cold environment, by transmitting the pressurized hot gas generated by the compressor 1 when it is working to the adsorption cylinder 2 to circulate and heat and exhaust the adsorption cylinder 2, thereby increasing the working temperature of the adsorbent in the cylinder, and improving the adsorption and desorption performance of the adsorbent in the adsorption cylinder 2, which is beneficial to improving the oxygen production performance of the oxygen concentrator and the miniaturization of the oxygen concentrator.

[0066] The above description is an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A low temperature preheating oxygen concentrator, characterized in that: include, case; An adsorption cylinder is arranged adjacent to the shell, and comprises an air inlet end and an air outlet end. The adsorption cylinder is filled with an adsorbent for adsorbing nitrogen to produce oxygen; A temperature sensor is arranged inside the adsorption cylinder, or arranged on the outer surface of the adsorption cylinder, and is used to detect the temperature of the adsorption cylinder; A controller, for receiving a signal and generating a control signal; A compressor is disposed inside the housing, operates in response to a control signal from the controller, and provides pressurized air to the adsorption cylinder; An air inlet pipeline is provided between the compressor and the adsorption cylinder and is used to deliver the pressurized gas generated by the compressor to the adsorption cylinder; A gas distribution valve assembly is arranged at the upper end of the shell, or at the upper end of the adsorption cylinder, and includes an air inlet, an air outlet and an exhaust port, wherein the air inlet is connected to the rear end of the air inlet pipeline, the air outlet is connected to the air inlet end of the adsorption cylinder, and the exhaust port is used to discharge the gas output from the air inlet end of the adsorption cylinder; The controller is respectively connected to the compressor, the temperature sensor and the gas distribution valve assembly by signal. The controller receives the temperature value fed back by the temperature sensor and controls the opening and closing of the gas distribution valve assembly according to the temperature value. When the temperature of the adsorption cylinder is lower than T, the oxygen concentrator enters the low-temperature preheating stage, the controller controls the compressor to input pressurized hot gas to the adsorption cylinder, and controls at least part of the vents of the gas distribution valve assembly to open, so as to transport the pressurized hot gas generated by the compressor to the adsorption cylinder for cyclic heating and exhaust of the adsorption cylinder, thereby increasing the working temperature of the adsorbent; When the temperature of the adsorption cylinder is higher than or equal to T, the oxygen generator enters the normal temperature oxygen production stage, the controller controls the compressor to input pressurized gas into the adsorption cylinder, and controls the gas distribution valve assembly to open the air inlet and the air outlet to input pressurized gas into the adsorption cylinder during pressurized adsorption, and to open the air outlet and the exhaust port to discharge nitrogen from the adsorption cylinder during decompression desorption.

2. The low-temperature preheating oxygen concentrator according to claim 1, characterized in that: There are two adsorption cylinders, and the temperature sensors correspond to the number of adsorption cylinders one by one. When the temperature of any adsorption cylinder is lower than T, the oxygen generator enters the low-temperature preheating stage, and the controller controls the compressor to input pressurized hot air to the adsorption cylinder to heat and exhaust the adsorption cylinder.

3. The low-temperature preheating oxygen concentrator according to claim 2, characterized in that: The gas distribution valve assembly includes two independent inlet and exhaust valves, which are two-position three-way valves, including an inlet, an outlet and an exhaust port, the inlet is connected to the outlet gas path, the exhaust port is connected to the outlet gas path, and each inlet and exhaust valve corresponds to an adsorption cylinder; or, The gas distribution valve assembly is an integrated valve, including an air inlet, an exhaust port and two air outlets, and each air outlet corresponds to the air inlet end of an adsorption cylinder, the air inlet is connected to both air outlets by air paths, and the exhaust port is also connected to both air outlets by air paths.

4. The low-temperature preheating oxygen concentrator according to claim 1 or 3, characterized in that: The air intake pipeline comprises a first air intake pipeline and a second air intake pipeline, and a heat dissipation pipe is arranged on the second air intake pipeline; During low-temperature preheating, the gas is transported to the adsorption cylinder through the first air inlet pipeline. During normal-temperature oxygen production, the gas is transported to the adsorption cylinder through the second air inlet pipeline.

5. The low-temperature preheating oxygen concentrator according to claim 4, characterized in that: A hole is arranged on one side of the shell near the adsorption cylinder, and a shielding part is movably arranged at a position corresponding to the hole inside the shell, and the area of ​​the shielding part is greater than or equal to the area of ​​the hole. When the shielding part completely covers the hole, the hole can be blocked.

6. The low-temperature preheating oxygen concentrator according to claim 4, characterized in that: It also includes a fan, which is arranged on the shell and located above the compressor, and operates in response to a control signal of a controller; during low-temperature preheating, the controller controls the fan to be turned off, and during normal-temperature oxygen production, the controller controls the fan to be turned on.

7. The low-temperature preheating oxygen concentrator according to claim 6, characterized in that: The fan is a centrifugal fan, the air inlet of the centrifugal fan corresponds to the air inlet pipeline, and the air outlet of the centrifugal fan is arranged directly above the compressor.

8. The low-temperature preheating oxygen concentrator according to claim 4, characterized in that: It also includes an air path regulating device, which is arranged between the compressor and the air intake pipeline and is used to control the opening and closing of the first air intake pipeline and the second air intake pipeline.

9. The low-temperature preheating oxygen concentrator according to claim 8, characterized in that: A tee is provided between the air intake pipeline and the gas distribution valve assembly, and the first and second air intake pipelines are connected to the gas distribution valve assembly through the tee.

10. The low-temperature preheating oxygen concentrator according to claim 9, characterized in that: A drying device is arranged between the three-way piece and the gas distribution valve assembly.

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