Nitrogen generation assembly and refrigerator
By installing a backflush tank in the nitrogen removal path of the molecular sieve tower and controlling it with a pressure shut-off valve, a throttling ring, and a solenoid valve, the problems of high equipment cost and low pressure differential in the existing refrigerator nitrogen generation system are solved, achieving more efficient nitrogen-oxygen separation and nitrogen concentration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO FOTILE KITCHEN WARE CO LTD
- Filing Date
- 2025-05-07
- Publication Date
- 2026-04-10
AI Technical Summary
In existing refrigerator nitrogen generation systems, the closed design of the backflush tank increases equipment costs and reduces the pressure difference between the inside and outside of the molecular sieve tower, thus affecting nitrogen generation efficiency.
A backflush tank is installed in the nitrogen venting path of the molecular sieve tower, and the discharge of nitrogen-rich gas is controlled by a pressure shut-off valve. The opening and closing of the backflush tank is controlled by a throttling ring and a solenoid valve to optimize the pressure difference inside and outside the molecular sieve tower and the nitrogen-oxygen separation efficiency.
Reduce equipment costs, increase the pressure difference inside and outside the molecular sieve tower, enhance the rate of oxygen expulsion from the body, and improve nitrogen production concentration and efficiency.
Smart Images
Figure CN224100337U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to refrigerator related technical field, especially, a kind of nitrogen production assembly and refrigerator are more particularly related to. BACKGROUND
[0002] The PSA (pressure swing adsorption) nitrogen production system of refrigerator passes through air pump and is drawn into molecular sieve tower, using the selective adsorption characteristics of molecular sieve, the impurities such as oxygen in air is adsorbed, and nitrogen is separated out and transported to preservation drawer, to form high concentration nitrogen environment, effectively inhibit food oxidation, prolong preservation period.
[0003] In the existing refrigerator nitrogen production system, although the backflushing tank connected on the branch of molecular sieve tower nitrogen discharge path can form pressure difference by storing gas when desorption oxygen discharge, to accelerate the discharge of oxygen-rich gas in molecular sieve tower, thereby improving nitrogen production concentration and efficiency, but its closed design needs to rely on the communication of three-way valve and main road of nitrogen discharge path, which increases equipment cost;At the same time, the residual air in backflushing tank contains oxygen, which reduces the internal and external pressure difference when molecular sieve tower desorption oxygen discharge, resulting in poor acceleration effect of oxygen-rich gas, affecting the optimization of nitrogen production system performance. SUMMARY
[0004] Therefore, it is necessary to provide a nitrogen production assembly and refrigerator for solving the above technical problems.
[0005] A nitrogen production assembly, the nitrogen production assembly comprising:
[0006] Molecular sieve tower, with air inlet and nitrogen outlet;
[0007] Air pump, in communication with the air inlet, for providing air to the molecular sieve tower;
[0008] Backflushing tank, enclosed to form a sealed cavity, the first interface and the second interface are arranged on the backflushing tank, the first interface and the second interface are in communication with the sealed cavity respectively, and the first interface is in communication with the nitrogen outlet;
[0009] Pressure stop valve, in communication with the second interface;
[0010] Wherein, the molecular sieve tower, the backflushing tank and the pressure stop valve are in communication and form a nitrogen discharge path, when the nitrogen-rich gas pressure value in the nitrogen discharge path is greater than the preset pressure value of the pressure stop valve, the pressure stop valve opens;When the nitrogen-rich gas pressure value in the nitrogen discharge path is less than the preset pressure value of the pressure stop valve, the pressure stop valve closes.
[0011] It can be understood that the back flushing tank is arranged on the nitrogen discharging passage of the molecular sieve tower, and the nitrogen making assembly can discharge the nitrogen-rich gas through the back flushing tank, so that on the one hand, the tee joint can be saved, thereby reducing the cost of the equipment; on the other hand, the internal and external pressure difference of the molecular sieve tower during oxygen desorption and discharge can be increased, and the discharge speed of the oxygen-rich gas in the molecular sieve tower can be increased, so that the separation efficiency of nitrogen and oxygen during the operation of the nitrogen making assembly can be improved, and the nitrogen making concentration can be improved.
[0012] In one of the embodiments, the preset pressure value of the pressure cut-off valve is set as P, wherein 2.5 bar≥P≥0.5 bar.
[0013] In one of the embodiments, the total amount of the nitrogen-rich gas discharged from the nitrogen outlet of the molecular sieve tower in one nitrogen making period is set as C1, and the capacity of the sealed cavity of the back flushing tank is set as C2, wherein 1 / 3×C1≥C2≥1 / 6×C1.
[0014] In one of the embodiments, the nitrogen making assembly further comprises a throttle ring, which is arranged on the nitrogen discharging passage and in communication with the nitrogen outlet and the first interface respectively, and is used for throttling the nitrogen-rich gas discharged from the nitrogen outlet.
[0015] Furthermore, the inner diameter of the throttle ring is set as r, wherein 0.35 mm≥r≥0.15 mm.
[0016] It can be understood that the throttle ring is used for throttling the nitrogen-rich gas discharged from the nitrogen outlet, so that on the one hand, the pressure of the adsorption nitrogen making of the molecular sieve tower can be maintained, thereby further improving the nitrogen making concentration of the molecular sieve tower; on the other hand, the action time of the back flushing tank for back flushing the nitrogen-rich gas to the molecular sieve tower can be prolonged, so as to further accelerate the discharge of the oxygen-rich gas in the molecular sieve tower, thereby further improving the nitrogen making efficiency of the nitrogen making assembly.
[0017] In one of the embodiments, the nitrogen making assembly further comprises a first electromagnetic valve, which is arranged on the nitrogen discharging passage and in communication with the nitrogen outlet and the first interface respectively, and is used for controlling the opening / closing of the nitrogen discharging passage.
[0018] It can be understood that the first electromagnetic valve is used for controlling the opening / closing of the back flushing tank for back flushing the molecular sieve tower, so that the back flushing tank can be controlled as needed, thereby creating conditions for further accelerating the discharge of the oxygen-rich gas in the molecular sieve tower.
[0019] In one of the embodiments, the nitrogen making assembly further comprises a controller, which is electrically connected with the first electromagnetic valve.
[0020] When the molecular sieve tower is adsorbing nitrogen, the controller controls the first electromagnetic valve to be opened.
[0021] When the molecular sieve tower is in desorption and oxygen is discharged, the controller controls the first electromagnetic valve to switch between closing and opening.
[0022] In one of the embodiments, the nitrogen production assembly further comprises a controller, which is electrically connected with the first electromagnetic valve.
[0023] When the molecular sieve tower is in adsorption and nitrogen is produced, the controller controls the first electromagnetic valve to open.
[0024] When the molecular sieve tower is in desorption and oxygen is discharged, the controller controls the first electromagnetic valve to switch between closing and opening.
[0025] In one of the embodiments, the molecular sieve tower further has an oxygen outlet, and when the molecular sieve tower is in desorption and oxygen is discharged, the molecular sieve tower can discharge oxygen-rich gas through the oxygen outlet.
[0026] The nitrogen production assembly further comprises a second electromagnetic valve, which is in communication with the oxygen outlet and is used to control the opening / closing of the oxygen outlet.
[0027] In one of the embodiments, the oxygen outlet and the gas inlet are configured as the same interface on the molecular sieve tower.
[0028] The nitrogen production assembly further comprises a tee joint, and three branches of the tee joint are in communication with the gas pump, the gas inlet and the second electromagnetic valve respectively.
[0029] The application further provides a refrigerator comprising the above-mentioned nitrogen production assembly.
[0030] Thanks to the application of the above technical solution, the application has the following advantages compared with the prior art.
[0031] The nitrogen production assembly and the refrigerator as claimed in the application have the following advantages: the back flushing tank is arranged on the nitrogen discharge path of the molecular sieve tower, and the nitrogen production assembly can discharge nitrogen-rich gas through the back flushing tank, which can save the tee joint, reduce the cost of the equipment, increase the internal and external pressure difference when the molecular sieve tower is in desorption and oxygen discharge, and improve the discharge speed of the oxygen-rich gas in the molecular sieve tower, thereby improving the separation efficiency of nitrogen and oxygen and the nitrogen production concentration when the nitrogen production assembly is working. BRIEF DESCRIPTION OF DRAWINGS
[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort.
[0033] Figure 1 The flowchart of the adsorption nitrogen production of the nitrogen production assembly provided in the application.
[0034] Figure 2 The flowchart of the desorption oxygen discharge of the nitrogen production assembly provided in the application.
[0035] Figure 3 The schematic diagram of the nitrogen production assembly provided in the application in the alternation of the adsorption nitrogen production and the desorption oxygen discharge.
[0036] Figure 4 The curve schematic diagram of the desorption oxygen discharge of the molecular sieve tower provided in the application.
[0037] Reference signs: 100, nitrogen production assembly; 101, nitrogen discharge passage; 10, molecular sieve tower; 11, gas inlet; 12, nitrogen outlet; 13, oxygen outlet; 20, gas pump; 30, back flushing tank; 31, first interface; 32, second interface; 40, pressure stop valve; 50, throttle ring; 60, first electromagnetic valve; 70, second electromagnetic valve; 80, three-way joint. DETAILED DESCRIPTION
[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0039] It should be noted that when an element is referred to as being "provided on" another element, it can be directly provided on the other element or there can be a middle element. When an element is referred to as being "provided on" another element, it can be directly provided on the other element or there can be a middle element. When an element is referred to as being "fixed on" another element, it can be directly fixed on the other element or there can be a middle element.
[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application only for the purpose of describing specific embodiments of the present application, and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0041] The nitrogen production assembly 100 claimed in the present application, in particular, is applied to the nitrogen production system for the refrigerator nitrogen production preservation.
[0042] As shown in Figure 1 , Figure 2 , the nitrogen production assembly 100 provided by an embodiment of the present application comprises a molecular sieve tower 10, an air pump 20, a back flushing tank 30 and a pressure cut-off valve 40, the molecular sieve tower 10 is provided with an air inlet 11 and a nitrogen outlet 12; the air pump 20 is communicated with the air inlet 11 and is used for providing air to the molecular sieve tower 10; the back flushing tank 30 is enclosed to form a sealed cavity (not shown in the figure), the back flushing tank 30 is provided with a first interface 31 and a second interface 32, the first interface 31 and the second interface 32 are respectively communicated with the sealed cavity, and the first interface 31 is communicated with the nitrogen outlet 12; the pressure cut-off valve 40 is communicated with the second interface 32; wherein the molecular sieve tower 10, the back flushing tank 30 and the pressure cut-off valve 40 are communicated and form a nitrogen discharge channel 101; when the pressure value of the nitrogen-rich gas in the nitrogen discharge channel 101 is greater than the preset pressure value of the pressure cut-off valve 40, the pressure cut-off valve 40 is opened; when the pressure value of the nitrogen-rich gas in the nitrogen discharge channel 101 is less than the preset pressure value of the pressure cut-off valve 40, the pressure cut-off valve 40 is closed.
[0043] As can be seen from the above, the nitrogen production assembly 100 of the present application sets the back flushing tank 30 on the nitrogen discharge channel 101 of the molecular sieve tower 10, and the nitrogen production assembly 100 can discharge the nitrogen-rich gas through the back flushing tank 30, which can save the tee joint, thereby reducing the cost of the equipment; on the other hand, it can also increase the internal and external pressure difference when the molecular sieve tower 10 discharges oxygen, and improve the discharge speed of the oxygen-rich gas in the molecular sieve tower 10, thereby improving the nitrogen-oxygen separation efficiency when the nitrogen production assembly 100 works, and improving the nitrogen production concentration. It should be noted that the internal and external pressure difference of the molecular sieve tower 10 when discharging oxygen refers to the difference between the oxygen concentration in the molecular sieve tower 10 and the oxygen concentration in the nitrogen-rich gas back flushed from the back flushing tank 30 to the molecular sieve tower 10.
[0044] It should be noted that the present application sets the back flushing tank 30 on the nitrogen discharge channel 101 of the molecular sieve tower 10, so that the nitrogen-rich gas in the nitrogen discharge channel 101 can flow out through the back flushing tank 30 when the molecular sieve tower 10 is adsorbing nitrogen, and the nitrogen-rich gas can discharge the original air in the back flushing tank 30 at the same time in the process of passing through the back flushing tank 30. In this way, when the molecular sieve tower 10 discharges oxygen, the gas back flushed to the molecular sieve tower 10 by the back flushing tank 30 is the nitrogen-rich gas obtained by the molecular sieve tower 10 when adsorbing nitrogen, thereby further increasing the internal and external pressure difference when the molecular sieve tower discharges oxygen.
[0045] In the embodiment, the total amount of the nitrogen-rich gas discharged from the nitrogen outlet 12 of the molecular sieve tower 10 in one nitrogen production cycle is set as C1, and the capacity of the sealed cavity of the back flushing tank 30 is set as C2, wherein 1 / 3xC1≥C2≥1 / 6xC1, and specifically, C2 can be set as 1 / 3, 1 / 4, 1 / 5, or 1 / 6 of C1, etc. Here, the back flushing tank 30 is a hollow pressure-resistant cavity, and the nitrogen production cycle mentioned above specifically refers to one complete adsorption nitrogen production process of the molecular sieve tower 10. It should be noted that since the back flushing tank 30 of the present application is in communication with the molecular sieve tower 10 and the pressure stop valve 40, the internal pressure of the back flushing tank 30 is consistent with the molecular sieve tower 10 and the pressure stop valve 40, which is the pressure when the pressure stop valve 40 is opened.
[0046] In the embodiment, the pressure stop valve 40 is a valve that allows one-way flow of the nitrogen-rich gas. The pressure stop valve 40 will only open and allow the nitrogen-rich gas to be discharged when and only when the pressure value of the nitrogen-rich gas in the nitrogen discharge channel 101 is greater than the preset pressure value P of the pressure stop valve 40. In the opposite direction, no matter how large the pressure of the external gas flow source is, the pressure stop valve 40 cannot allow the reverse flow into the nitrogen discharge channel 101. Here, the preset pressure value P of the pressure stop valve 40 is between 2.5 bar and 0.5 bar, for example, P is set as 2.5 bar, 2.1 bar, 1.5 bar, or 0.5 bar, and specifically, it can be set according to the use requirements of the nitrogen production assembly 100, which will not be described here.
[0047] As shown in Figure 1 , Figure 2 In the embodiment, the nitrogen production assembly 100 further comprises a throttle ring 50, which is arranged on the nitrogen discharge channel 101 and in communication with the nitrogen outlet 12 and the first interface 31, respectively, for limiting the flow of the nitrogen-rich gas discharged from the nitrogen outlet 12; and the inner diameter of the throttle ring 50 is set as r, wherein 0.35mm≥r≥0.15mm, and specifically, the inner diameter of the throttle ring 50 can be set as 0.35mm, 0.2mm, or 0.15mm. Here, the throttle ring 50 can be configured as a hollow cylinder.
[0048] It can be understood that since the throttle ring 50 is used to limit the flow of the nitrogen-rich gas discharged from the nitrogen outlet 12, on the one hand, it can maintain the pressure of the adsorption nitrogen production of the molecular sieve tower 10, thereby further improving the nitrogen production concentration of the molecular sieve tower 10; on the other hand, it can also prolong the action time when the back flushing tank 30 back flushes the nitrogen-rich gas to the molecular sieve tower 10, thereby further accelerating the discharge of the oxygen-rich gas in the molecular sieve tower 10, and thus further improving the nitrogen production efficiency of the nitrogen production assembly 100.
[0049] As shown in Figure 1 , Figure 2As shown, in this embodiment, the nitrogen generation assembly 100 further includes a first solenoid valve 60. The first solenoid valve 60 is disposed on the nitrogen venting passage 101 and is connected to the nitrogen outlet 12 and the first interface 31 respectively, and is used to control the opening / closing of the nitrogen venting passage 101. That is to say, this application can use the first solenoid valve 60 to control the opening / closing of the backflush tank 30 when backflushing the molecular sieve tower 10, so that the backflush tank 30 can be controlled to backflush as needed, which creates conditions for further accelerating the discharge of oxygen-rich gas in the molecular sieve tower 10.
[0050] In this embodiment, the nitrogen generation assembly 100 also includes a controller (not shown), which is electrically connected to the first solenoid valve 60. When the molecular sieve tower 10 adsorbs and generates nitrogen, the controller controls the first solenoid valve 60 to open. That is to say, the setting of the first solenoid valve 60 on the nitrogen discharge passage 101 will not affect the discharge of nitrogen-rich gas when the molecular sieve tower 10 adsorbs and generates nitrogen.
[0051] like Figure 3 , Figure 4 As shown, in this embodiment, when the molecular sieve column 10 is desorbing and purging oxygen, the controller controls the first solenoid valve 60 to close first, and then controls the first solenoid valve 60 to open. That is, the backflush tank 30 can backflush the molecular sieve column 10 during the latter half of the desorption and purging process, making the backflush effect stronger during the latter half of the desorption and purging. Here, the controller can control the first solenoid valve 60 to open when the molecular sieve column 10 is halfway through desorption and purging. It should be noted that the total amount of nitrogen-rich gas is the same when the backflush tank 30 backflushes the molecular sieve column 10. By using the controller to control the opening / closing of the first solenoid valve 60, the backflush effect of the backflush tank 30 backflushing the molecular sieve column 10 can be effectively controlled. It should be noted that in other embodiments, the controller can also control the first solenoid valve 60 to switch back and forth between closed and open, and realize the interval control of the backflush effect of the backflush tank 30 backflushing the molecular sieve column 10, which will not be elaborated here. Figure 3 The horizontal line above time t represents the process of adsorption and nitrogen production in the molecular sieve tower 10, while the horizontal line below time t represents the process of desorption and oxygen removal in the molecular sieve tower 10. The cross-section below time t represents the backflushing of nitrogen-rich gas from the backflushing tank 30 to the molecular sieve tower 10.
[0052] like Figure 1 , Figure 2As shown in the figure, in the embodiment, the molecular sieve tower 10 also has an oxygen outlet 13, when the molecular sieve tower 10 desorbs oxygen, the molecular sieve tower 10 can discharge the oxygen-enriched gas through the oxygen outlet 13; and the nitrogen production assembly 100 also comprises a second electromagnetic valve 70, the second electromagnetic valve 70 is communicated with the oxygen outlet 13, for controlling the opening / closing of the oxygen outlet 13. That is, when the molecular sieve tower 10 desorbs oxygen, the second electromagnetic valve 70 is opened, so that the molecular sieve tower 10 can discharge the oxygen-enriched gas through the oxygen outlet 13. Here, the oxygen outlet 13 and the nitrogen outlet 12 are arranged at both ends of the molecular sieve tower 10, and specifically, the oxygen outlet 13 and the gas inlet 11 can be arranged on the same interface of the molecular sieve tower 10. It can be understood that in other embodiments, the oxygen outlet 13 can also be arranged independently of the gas inlet 11, which will not be expanded here.
[0053] As shown in the figure, Figure 1 , Figure 2 As shown in the figure, in the embodiment, the nitrogen production assembly 100 also comprises a three-way valve 80, three branches of the three-way valve 80 are communicated with the gas pump 20, the gas inlet 11 and the second electromagnetic valve 70 respectively.
[0054] In addition, the application also provides a refrigerator comprising the above-mentioned nitrogen production assembly 100.
[0055] The technical features of the above embodiments can be combined in any way. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.
[0056] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as a limitation of the present application, as long as the above embodiments are appropriately changed and varied within the scope of the spirit of the present application, they fall within the scope of the present application.
Claims
1. A nitrogen production assembly comprising: The nitrogen production assembly (100) comprises: a molecular sieve tower (10) having an air inlet (11) and a nitrogen outlet (12); an air pump (20) in communication with the air inlet (11) for providing air to the molecular sieve tower (10); a back flushing tank (30) having a sealed cavity, the back flushing tank (30) being provided with a first interface (31) and a second interface (32), the first interface (31) and the second interface (32) being in communication with the sealed cavity, the first interface (31) being in communication with the nitrogen outlet (12); a pressure cut-off valve (40) in communication with the second interface (32); wherein the molecular sieve tower (10), the back flushing tank (30) and the pressure cut-off valve (40) are in communication and form a nitrogen discharge path (101), when the pressure value of the nitrogen-rich gas in the nitrogen discharge path (101) is greater than the preset pressure value of the pressure cut-off valve (40), the pressure cut-off valve (40) is opened; when the pressure value of the nitrogen-rich gas in the nitrogen discharge path (101) is less than the preset pressure value of the pressure cut-off valve (40), the pressure cut-off valve (40) is closed.
2. The nitrogen generation assembly of claim 1, wherein, The preset pressure value of the pressure cut-off valve (40) is set as P, wherein 2.5 bar≥P≥0.5 bar.
3. The nitrogen generation assembly of claim 1, wherein, The total amount of nitrogen-rich gas discharged from the nitrogen outlet (12) of the molecular sieve tower (10) in one nitrogen production cycle is set as C1, and the capacity of the sealed cavity of the back flushing tank (30) is set as C2, wherein 1 / 3×C1≥C2≥1 / 6×C1.
4. The nitrogen generation assembly of claim 1, wherein, The nitrogen production assembly (100) further comprises a throttle ring (50) arranged on the nitrogen discharge path (101) and in communication with the nitrogen outlet (12) and the first interface (31), respectively, for limiting the flow of the nitrogen-rich gas discharged from the nitrogen outlet (12); and the inner diameter of the throttle ring (50) is set as r, wherein 0.35 mm≥r≥0.15 mm.
5. The nitrogen generation assembly of claim 1, wherein, The nitrogen production assembly (100) further comprises a first electromagnetic valve (60) arranged on the nitrogen discharge path (101) and in communication with the nitrogen outlet (12) and the first interface (31), respectively, for controlling the opening / closure of the nitrogen discharge path (101).
6. The nitrogen generation assembly of claim 5, wherein, The nitrogen production assembly (100) further comprises a controller in electrical connection with the first electromagnetic valve (60); when the molecular sieve tower (10) is adsorbing nitrogen production, the controller controls the first electromagnetic valve (60) to open; when the molecular sieve tower (10) is desorbing oxygen, the controller controls the first electromagnetic valve (60) to close first and then to open.
7. The nitrogen generation assembly of claim 5, wherein, The nitrogen production assembly (100) further comprises a controller in electrical connection with the first electromagnetic valve (60); when the molecular sieve tower (10) is adsorbing nitrogen production, the controller controls the first electromagnetic valve (60) to open; when the molecular sieve tower (10) is desorbing oxygen, the controller controls the first electromagnetic valve (60) to switch back and forth between closing and opening.
8. The nitrogen generation assembly of claim 1, wherein, The molecular sieve tower (10) also has an oxygen outlet (13), when the molecular sieve tower (10) desorbs oxygen, the molecular sieve tower (10) can discharge oxygen-rich gas through the oxygen outlet (13); The nitrogen making assembly (100) further comprises a second electromagnetic valve (70) in communication with the oxygen outlet (13) for controlling the opening / closing of the oxygen outlet (13).
9. The nitrogen generation assembly of claim 8, wherein, The oxygen outlet (13) and the gas inlet (11) are configured as the same interface on the molecular sieve tower (10). The nitrogen making assembly (100) further comprises a tee joint (80) having three branches in communication with the gas pump (20), the gas inlet (11) and the second electromagnetic valve (70) respectively.
10. A refrigerator characterized by comprising: The nitrogen making assembly (100) comprises any one of claims 1-9.