A vegetable oil storage device

Abstract

The application relates to the field of food processing and discloses a vegetable oil storage device which comprises an oil storage tank, a bubbler, a first controller and a second controller. The bubbler comprises a shell and a bubbling pipe arranged in the shell. A discharge port, an oil inlet and an air inlet are arranged on the shell and are communicated with the shell. The discharge port is communicated with the oil storage tank. The air inlet end of the bubbling pipe extends out of the shell from the air inlet and is connected with an external nitrogen source. A plurality of air permeation holes penetrating through the wall of the bubbling pipe are distributed on the outer surface of the bubbling pipe in the circumferential direction, so that the nitrogen flowing into the bubbling pipe flows out through the air permeation holes and is mixed with the vegetable oil flowing into the shell. The first control valve is arranged between the oil inlet and an oil supply source and is used for controlling the vegetable oil flowing into the shell. The second control valve is arranged between the nitrogen source and the air inlet end of the bubbling pipe. The vegetable oil storage device can effectively reduce the contact between the oil and oxygen, delay the oxidation and rancidity of the vegetable oil, improve the stability of the oil, and prolong the shelf life of the oil.

Description

Technical Field

[0001] This utility model relates to the field of food processing technology, and in particular to a vegetable oil storage device. Background Technology

[0002] Vegetable oil is a compound formed by the reaction of higher fatty acids and glycerol. It is produced from oil-rich plant seeds through pretreatment processes such as cleaning, dehulling, crushing, softening, rolling, and extrusion puffing. Crude oil is then extracted using mechanical pressing or solvent extraction, followed by refining. Because vegetable oil contains a large amount of active unsaturated fatty acids, which gradually oxidize and deteriorate in the air, nitrogen is introduced into the storage tank to isolate it from air and preserve its freshness. However, current vegetable oil storage devices suffer from poor nitrogen isolation and high gas consumption, leading to high operating costs. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a vegetable oil storage device.

[0004] This application provides a vegetable oil storage device, comprising:

[0005] The oil storage tank is equipped with an exhaust port;

[0006] A bubbler includes a housing and a bubble tube disposed inside the housing. The housing has an outlet, an oil inlet, and an air inlet that communicate with the interior of the housing. The oil inlet is connected to an external oil supply source, and the outlet is connected to an oil storage tank. The air inlet of the bubble tube extends out of the housing from the air inlet and is connected to an external nitrogen source. The outer surface of the bubble tube has a plurality of vent holes that penetrate its wall along the circumferential direction, so that the nitrogen introduced into the bubble tube flows out through the vent holes and mixes with the vegetable oil introduced into the housing.

[0007] A first control valve is located between the oil inlet and the oil supply source, and is used to control the flow of vegetable oil into the housing.

[0008] The second control valve is located between the nitrogen source and the inlet end of the bubbling tube, and is used to control the flow of nitrogen into the bubbling tube.

[0009] In one embodiment, the oil storage tank is further provided with a feed inlet, and the discharge outlet is connected to the feed inlet of the oil storage tank via a connecting pipeline.

[0010] In one embodiment, the housing is elongated, and the peripheral sidewall of the housing extends outward to communicate with the interior of the housing. The oil inlet is located at the end of the extension away from the housing, and the discharge port and the air inlet are located at opposite ends of the housing.

[0011] In one embodiment, the vegetable oil storage device further includes:

[0012] The oil inlet pipeline includes an oil inlet line and a power pump, a filter, a first pressure gauge, a flow meter and a first check valve arranged sequentially on the oil inlet line. One end of the oil inlet line is connected to the oil inlet and the other end is connected to the oil supply source. The first control valve is arranged on the oil inlet line and is located between the filter and the first pressure gauge.

[0013] An exhaust pipeline includes an exhaust pipe and a third control valve disposed on the exhaust pipe, one end of which is connected to the exhaust port and the other end is connected to the outside atmosphere.

[0014] In one embodiment, the vegetable oil storage device further includes:

[0015] The intake pipeline includes an intake pipe and a second pressure gauge, a fourth control valve, and a second check valve sequentially disposed on the intake pipe. One end of the intake pipe is connected to the intake end of the bubbling tube, and the other end is connected to the nitrogen source. The second control valve is disposed on the intake pipe and located in front of the second pressure gauge.

[0016] In one embodiment, the vegetable oil storage device further includes:

[0017] The discharge pipeline includes a discharge pipe and a fifth control valve installed on the discharge pipe, one end of which is connected to the oil outlet of the oil storage tank.

[0018] In one embodiment, the vegetable oil storage device further includes:

[0019] The controller is electrically connected to the power pump, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the flow meter.

[0020] In one embodiment, the vegetable oil storage device further includes:

[0021] A pressure detection element is disposed outside the oil storage tank, with its detection end extending into the oil storage tank to detect the pressure inside the oil storage tank, and the pressure detection element is electrically connected to the controller.

[0022] In one embodiment, the vegetable oil storage device further includes a temperature monitoring device and a liquid level monitoring device disposed in the oil storage tank, both of which are electrically connected to the controller.

[0023] In one embodiment, a feed valve is provided on the connecting pipeline, and the feed valve is electrically connected to the controller.

[0024] The technical solutions provided in this application have the following advantages compared with the prior art:

[0025] By incorporating a bubbling tube within the casing and circumferentially venting multiple vents on its outer surface, nitrogen gas introduced through the inlet pipe is evenly released into the casing, ensuring thorough mixing with the vegetable oil. This mixture is then transported to a storage tank via connecting pipes. As nitrogen is continuously introduced, oxygen in the vegetable oil is expelled through the tank's vent. Once all oxygen is expelled, a nitrogen protective layer forms at the top of the tank, effectively reducing contact between the oil and oxygen. This delays oxidative rancidity, improves oil stability, and extends shelf life. Furthermore, the circumferentially distributed vents on the bubbling tube's outer surface evenly release air bubbles, preventing bubble concentration or uneven distribution caused by large pores, thus reducing residual oxygen areas in the vegetable oil. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] In the attached image:

[0029] Figure 1 This is a schematic diagram of the structure of a vegetable oil storage device according to this application;

[0030] Figure 2 This is a schematic diagram of the bubbler in a vegetable oil storage device according to this application;

[0031] Figure 3 This is a partial schematic diagram of the bubbling tube in a vegetable oil storage device according to this application.

[0032] Icon labels:

[0033] 10. Oil storage tank; 20. Bubble blower; 21. Shell; 21a. Discharge port; 21b. Oil inlet; 21c. Air inlet; 211. Extension; 22. Bubble tube; 22a. Vent hole; 30. Connecting pipeline; 40. First control valve; 50. Second control valve; 60. Oil inlet pipeline; 61. Oil inlet pipeline; 62. Power pump; 63. Filter; 64. First pressure gauge; 65. Flow meter; 66. ... 70. Check valve; 71. Exhaust line; 72. Third control valve; 80. Inlet line; 81. Inlet line; 82. Second pressure gauge; 83. Fourth control valve; 84. Second check valve; 90. Discharge line; 91. Discharge line; 92. Fifth control valve; 100. Controller; 110. Pressure sensor; 120. Temperature sensor; 130. Liquid level sensor; 140. Feed valve. Detailed Implementation

[0034] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0035] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0036] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0037] Please refer to Figures 1 to 3 This application provides a vegetable oil storage device, which includes an oil storage tank 10, a bubbler 20, a first control valve 40, and a second control valve 50. The oil storage tank 10, as a container for storing vegetable oil, can be made of a corrosion-resistant and oxidation-resistant metal material (such as stainless steel or aluminum) or a non-metallic material (such as polypropylene or polyethylene), and there is no limitation on the type. Furthermore, before introducing the vegetable oil into the oil storage tank 10, the vegetable oil and nitrogen gas need to be thoroughly mixed. Then, the mixture of vegetable oil and nitrogen gas is introduced into the oil storage tank 10. As nitrogen gas is continuously introduced, the oxygen contained in the vegetable oil is discharged to the outside atmosphere through the exhaust port of the oil storage tank 10. After all the oxygen in the oil storage tank 10 is completely discharged, a nitrogen protective layer is formed at the top of the oil storage tank 10, thereby ensuring that the vegetable oil entering the oil storage tank 10 is better isolated from air and achieves the purpose of preservation. Therefore, the bubbler 20 of this application is used to mix the vegetable oil introduced through the oil inlet line 40 with the nitrogen introduced through the air inlet line 50, so as to replace the oxygen contained in the vegetable oil.

[0038] Specifically, the oil storage tank 10 has an inlet and an outlet. The bubbler 20 includes a shell 21 and a bubble tube 22 located inside the shell 21. The shell 21 has an outlet 21a, an oil inlet 20b, and an air inlet 21c that connect to the inside of the shell 21. The oil inlet 21b is used to connect to an external oil supply source. The outlet 21a is connected to the inlet of the oil storage tank 10 through a connecting pipe 30. The air inlet end of the bubble tube 22 extends out of the shell 10 from the air inlet 21c and is connected to an external nitrogen source. The outer surface of the bubble tube 22 has a plurality of vent holes 22a that penetrate its wall in the circumferential direction, so that the nitrogen gas introduced into the bubble tube 22 flows out through the vent holes 22a and mixes with the vegetable oil introduced into the shell 21. The first control valve 40 is located between the oil inlet 21b and the oil supply source, and is used to control the flow of vegetable oil into the housing 21. The second control valve 50 is located between the nitrogen source and the air inlet of the bubbling tube 22, and is used to control the flow of nitrogen into the bubbling tube. The first control valve 40 and the second control valve 50 can be pneumatic valves, that is, the opening degree of the pneumatic valve can be adjusted by pneumatic control, thereby automatically controlling the oil intake, realizing process automation, and reducing manual intervention.

[0039] In other words, when vegetable oil is introduced into the oil storage tank 10 for storage, the first control valve 40 is opened to allow the oil supply source to introduce vegetable oil into the shell 21, and at the same time the second control valve 50 is opened to allow nitrogen supplied by the nitrogen source to be introduced into the bubbling tube 22. Since the bubbling tube 22 is located inside the shell 21, and the outer surface of the bubbling tube 22 has multiple vent holes 22a that penetrate the tube wall along the circumferential direction, the nitrogen introduced into the bubbling tube 22 flows out from the vent holes 22a into the shell 21, thereby achieving the mixing and contact of nitrogen and vegetable oil. The mixed vegetable oil is then introduced into the oil storage tank 10 through the feed port via the connecting pipe 30 for storage. Furthermore, as a mixture of vegetable oil and nitrogen is continuously introduced into the oil storage tank 10, the pressure inside the tank continuously increases, causing air inside the tank to be continuously discharged into the outside atmosphere through the exhaust port. After all the air inside the tank is expelled, nitrogen forms a protective layer at the top of the tank, effectively isolating it from air and reducing the risk of oil oxidation and deterioration of the vegetable oil. It should be noted that before introducing vegetable oil into the shell 21, nitrogen can be introduced into the bubbling tube 22 first. This allows the nitrogen entering the bubbling tube 22 to flow out through the vent hole 22a. Because the vent hole 22a is small, the nitrogen flow generates a large blowing force, thus preventing the vegetable oil entering the shell 21 from seeping into the bubbling tube 22 through the vent hole, causing blockage of the vent hole 22a and preventing nitrogen from flowing out.

[0040] Therefore, this vegetable oil storage device, by setting a bubbling tube 22 inside the shell 21 and having multiple vent holes 22a arranged circumferentially on the outer surface of the bubbling tube 22, allows nitrogen gas introduced into the bubbling tube 22 via the air inlet pipe 81 to be evenly released into the interior of the shell 21, thereby ensuring thorough mixing of nitrogen gas and vegetable oil. The mixture of vegetable oil and nitrogen gas is then introduced into the oil storage tank 10 via the connecting pipe 30 for storage. As nitrogen gas is continuously introduced, the oxygen contained in the vegetable oil is discharged into the external atmosphere through the exhaust port of the oil storage tank 10. After all the oxygen in the oil storage tank 10 is completely discharged, a nitrogen protective layer forms at the top of the oil storage tank 10, effectively reducing the contact between the oil and oxygen, thus delaying the oxidative rancidity of the vegetable oil, improving the stability of the oil, and extending the shelf life of the oil. Furthermore, because the vent holes distributed circumferentially on the outer surface of the bubbling tube 22 can evenly release bubbles, it avoids the concentration or uneven distribution of bubbles caused by large pore sizes, thereby reducing the residual oxygen area in the vegetable oil.

[0041] For example, the length of the connecting pipe 30 needs to be set to more than 60m to ensure that the mixing time of vegetable oil and nitrogen is greater than 30s, thereby ensuring that nitrogen and vegetable oil are fully mixed.

[0042] In one embodiment, the pore size of the vent 22a is 2–5 μm. That is, when nitrogen gas is introduced into the bubbling tube 22, the tiny pores of the vent 22a force the nitrogen gas to form micron-sized bubbles as it passes through, greatly increasing the gas-liquid contact area and accelerating the mixing efficiency of nitrogen and vegetable oil. Simultaneously, the generated microbubbles can cover a larger area of ​​the oil, significantly reducing the dissolved oxygen content in the vegetable oil and inhibiting oxidation. Furthermore, the micron-sized vent 22a generates a significant blowing force on the vegetable oil outside the bubbling tube 22, preventing vegetable oil introduced into the shell 21 from seeping into the bubbling tube 22 and clogging the vent 22a, thus preventing nitrogen from flowing out. At the same time, the micron-sized vents can effectively control the nitrogen release rate, avoiding excessive gas waste caused by large pores and reducing nitrogen supply costs.

[0043] In one embodiment, the shell 21 is elongated, and its peripheral sidewalls extend outwards to form an extension 211 that communicates with the interior of the shell 21. An oil inlet 21b is located at the end of the extension 211 furthest from the shell 21, while an outlet 21a and an air inlet 21c are located at opposite ends of the shell 21. In other words, when vegetable oil and nitrogen are introduced respectively, the direction of nitrogen flow and the direction of vegetable oil inflow create a spatially intersecting flow field, eliminating local dead zones and prolonging the gas-liquid contact time, thus improving deoxygenation efficiency.

[0044] In one embodiment, the vegetable oil storage device further includes an oil inlet line 60 and an exhaust line 70. The oil inlet line 60 includes an oil inlet pipe 61 and a power pump 62, a filter 63, a first pressure gauge 64, a flow meter 65, and a first check valve 66 sequentially disposed on the oil inlet pipe 61. One end of the oil inlet pipe 61 is connected to the oil inlet port 21b, and the other end is connected to the oil supply source. A first control valve 40 is disposed on the oil inlet pipe 61 and located between the filter 63 and the first pressure gauge 64. The exhaust line 70 includes an exhaust pipe 71 and a third control valve 72 disposed on the exhaust pipe 71. One end of the exhaust pipe 71 is connected to the exhaust port, and the other end is connected to the outside atmosphere.

[0045] For example, the power pump 62 is used to provide the necessary power to introduce vegetable oil into the oil storage tank 10. For this purpose, the power pump 62 can be a feed pump commonly used in the prior art for conveying materials.

[0046] In other words, when the oil storage tank 10 is in operation, the power pump 62 starts to drive the vegetable oil from the oil supply source into the oil inlet pipeline. The vegetable oil then passes through the filter 63 for filtration, and subsequently passes through the first pressure gauge 64, the flow meter 65, and the first check valve 66 before entering the housing 21 to mix with nitrogen. Finally, it is introduced into the oil storage tank 10 for storage. The filter 63 filters out suspended impurities in the vegetable oil, preventing blockage of subsequent equipment (such as the vent of the bubbling tube 22), thus extending the service life of components. The first pressure gauge 64 monitors the pressure of the oil inlet pipeline 61 in real time, providing early warning of blockages or leaks. The flow meter 65 measures the oil supply rate, forming a closed-loop control with the subsequent nitrogen bubbling deoxygenation to ensure optimized gas-liquid ratio. The first check valve 66 prevents backflow of oil, avoiding contamination of the oil storage tank 10 or damage to the power pump 62.

[0047] Furthermore, as nitrogen is continuously introduced, the pressure inside the oil storage tank 10 gradually increases until it reaches a preset pressure value. At this point, the third control valve 72 opens, connecting the exhaust pipe 71 to the external atmosphere. This allows air inside the oil storage tank 10 to be continuously discharged into the external atmosphere through the exhaust pipe 71. Once all the air in the oil storage tank 10 has been expelled, nitrogen will form a protective layer at the top of the tank, effectively isolating it from air and reducing the risk of oil oxidation and deterioration of the vegetable oil. It should be noted that the third control valve 72 can be a pneumatically controlled valve. The pressure range for opening the third control valve 72 can be preset. Once the pressure inside the oil storage tank 10 reaches the preset pressure value, the third control valve 72 will automatically open without manual intervention.

[0048] In one embodiment, the vegetable oil storage device further includes an air inlet line 80, which includes an air inlet pipe 81 and a second pressure gauge 82, a fourth control valve 83, and a second check valve 84 sequentially disposed on the air inlet pipe 81. One end of the air inlet pipe 81 is connected to the air inlet end of the bubbling pipe 22, and the other end is connected to a nitrogen source. The second control valve 50 is disposed on the air inlet pipe 81 and is located in front of the second pressure gauge 82.

[0049] In other words, during nitrogen supply, the second control valve 50 is opened to connect the intake pipe 81 to the bubbling tube 22, allowing nitrogen supplied by the nitrogen source to enter the bubbling tube 22 via the intake pipe 81. The nitrogen entering the bubbling tube 22 then flows out through the vent and into the housing 21 to mix with the vegetable oil. Additionally, the opening of the fourth control valve 83 can be adjusted to regulate the nitrogen intake according to process requirements, preventing oversupply and reducing operating costs. The second pressure gauge 82 provides real-time pressure feedback to work with the fourth control valve 83 for adaptive adjustment, maintaining a constant supply pressure and eliminating uneven bubbling caused by fluctuations in pipe resistance. The second check valve 84 prevents oil from backflowing into the intake pipe 81, protecting the purity of the gas source.

[0050] In one embodiment, the vegetable oil storage device further includes a discharge pipeline 90, which includes a discharge pipe 91 and a fifth control valve 92 disposed on the discharge pipe 91. One end of the discharge pipe 91 is connected to the oil outlet of the oil storage tank 10. That is, when discharge is required, the vegetable oil is controlled to flow out of the discharge pipe 91 only by controlling the opening degree of the fifth control valve 92, avoiding frequent opening of the oil outlet of the oil storage tank 10, which would lead to oxygen infiltration.

[0051] In one embodiment, the vegetable oil storage device further includes a controller 100, which is electrically connected to a power pump 62, a first control valve 40, a second control valve 50, a third control valve 72, a fourth control valve 83, a fifth control valve 92, and a flow meter 65. That is, the controller 100 can adjust the speed of the power pump 62 and the opening degrees of the first control valve 40, the second control valve 50, and the fourth control valve 83 in real time based on data from the flow meter 65 to ensure the optimal gas-liquid ratio for nitrogen bubbling deoxygenation, avoiding excessive nitrogen waste or insufficient deoxygenation, thereby reducing operating costs. It should be noted that how the controller 100 is electrically connected to the power pump 62, the first control valve 40, the second control valve 50, the third control valve 72, the fourth control valve 83, the fifth control valve 92, and the flow meter 65, and how it is controlled to open or close, is common knowledge to those skilled in the art and will not be elaborated upon here.

[0052] In one embodiment, the vegetable oil storage device further includes a pressure detection element 110, which is located outside the oil storage tank 10. The detection end of the pressure detection element 110 extends into the oil storage tank 10 to detect the pressure inside the oil storage tank 10, and the pressure detection element 110 is electrically connected to the controller 100. Thus, the pressure detection element 110 can be used to detect the pressure inside the oil storage tank 10. If the detected pressure value inside the oil storage tank 10 is higher than the set maximum pressure value, the controller 100 controls the third control valve 72 to open, so that the air inside the oil storage tank 10 is discharged through the exhaust pipe 71, eliminating the need for manual opening of the third control valve 72 and reducing labor intensity. If the detected pressure value inside the oil storage tank 10 is lower than the set minimum pressure value, the controller 100 controls the second control valve 50 and the fourth control valve 83 to open, so that the oil storage tank 100 is supplied with fresh oil. Nitrogen gas is introduced into the oil storage tank 10. At this time, the third control valve 72 is in the closed state. As nitrogen gas is continuously introduced, the pressure in the oil storage tank 10 continues to rise until it reaches the set maximum pressure value. Then, the controller 100 controls the second control valve 50 and the fourth control valve 83 to close to stop nitrogen gas filling and opens the third control valve 72 to allow the gas in the oil storage tank 10 to be discharged. This realizes the cycle of nitrogen filling and venting, ensuring that the gas pressure in the oil storage tank 10 remains stable within a certain range, so that the vegetable oil in the oil storage tank 10 is always under nitrogen sealing protection.

[0053] In one embodiment, the vegetable oil storage device further includes a temperature monitoring element 120 and a liquid level monitoring element 130 disposed within the oil storage tank 10, both of which are electrically connected to the controller 100. Thus, the temperature monitoring element 120 can provide real-time feedback on the oil temperature within the oil storage tank 10, achieving precise temperature control to prevent oil peroxidation caused by high temperatures. Simultaneously, when the liquid level monitoring element 130 detects a drop in liquid level, the controller 100 can control and reduce the amount of nitrogen bubbling to avoid excessive gas supply and waste.

[0054] In one embodiment, a feed valve 140 is provided on the connecting pipeline 30, and the feed valve 140 is electrically connected to the controller 100. In this way, the opening degree of the feed valve 140 can be controlled according to demand to achieve quantitative feeding and avoid pressure fluctuations or energy waste in the oil storage tank 10 caused by excessive oil injection.

[0055] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A vegetable oil storage device, characterized in that, include: Oil storage tank (10) is provided with an exhaust port; A bubbler (20) includes a housing (21) and a bubble tube (22) disposed inside the housing (21). The housing (21) is provided with an outlet (21a), an oil inlet (21b) and an air inlet (21c) communicating with the inside of the housing (21). The oil inlet (21b) is used to connect with an external oil supply source. The outlet (21a) is connected with the oil storage tank (10). The air inlet end of the bubble tube (22) extends out of the housing (21) from the air inlet (21c) and is connected to an external nitrogen source. The outer surface of the bubble tube (22) is provided with a plurality of vent holes (22a) that penetrate its wall, so that the nitrogen gas introduced into the bubble tube (22) flows out through the vent holes (22a) and mixes with the vegetable oil introduced into the housing (21). A first control valve (40) is located between the oil inlet (21b) and the oil supply source, and is used to control the flow of vegetable oil into the housing (21); The second control valve (50) is located between the nitrogen source and the inlet end of the bubbling tube (22) and is used to control the flow of nitrogen into the bubbling tube (22).

2. The vegetable oil storage device according to claim 1, characterized in that, The oil storage tank (10) is also provided with a feed inlet, and the discharge outlet is connected to the feed inlet of the oil storage tank (10) through a connecting pipe (30).

3. The vegetable oil storage device according to claim 1, characterized in that, The housing (21) is elongated, and the peripheral sidewall of the housing (21) extends outward to have an extension (211) that communicates with the interior of the housing (21). The oil inlet (21b) is located at the end of the extension (211) away from the housing (21), and the discharge port (21a) and the air inlet (21c) are located at opposite ends of the housing (21).

4. The vegetable oil storage device according to claim 1, characterized in that, The vegetable oil storage device also includes: The oil inlet pipeline (60) includes an oil inlet line (61) and a power pump (62), a filter (63), a first pressure gauge (64), a flow meter (65) and a first check valve (66) sequentially arranged on the oil inlet line (61). One end of the oil inlet line (61) is connected to the oil inlet (21b) and the other end is connected to the oil supply source. The first control valve (40) is arranged on the oil inlet line (61) and is located between the filter (63) and the first pressure gauge (64). The exhaust line (70) includes an exhaust pipe (71) and a third control valve (72) provided on the exhaust pipe (71). One end of the exhaust pipe (71) is connected to the exhaust port of the oil storage tank (10), and the other end is connected to the outside atmosphere.

5. The vegetable oil storage device according to claim 4, characterized in that, The vegetable oil storage device also includes: The intake pipeline (80) includes an intake pipe (81) and a second pressure gauge (82), a fourth control valve (83) and a second check valve (84) sequentially disposed on the intake pipe (81). One end of the intake pipe (81) is connected to the intake end of the bubbling tube (22), and the other end is connected to the nitrogen source. The second control valve (50) is disposed on the intake pipe (81) and located in front of the second pressure gauge (82).

6. The vegetable oil storage device according to claim 5, characterized in that, The vegetable oil storage device also includes: The discharge pipeline (90) includes a discharge pipe (91) and a fifth control valve (92) provided on the discharge pipe (91). One end of the discharge pipe (91) is connected to the oil outlet of the oil storage tank (10).

7. The vegetable oil storage device according to claim 6, characterized in that, The vegetable oil storage device also includes: The controller (100) is electrically connected to the power pump (62), the first control valve (40), the second control valve (50), the third control valve (72), the fourth control valve (83), the fifth control valve (92), and the flow meter (65).

8. The vegetable oil storage device according to claim 7, characterized in that, The vegetable oil storage device also includes: A pressure detection element (110) is disposed outside the oil storage tank (10). The detection end of the pressure detection element (110) extends into the oil storage tank (10) to detect the pressure inside the oil storage tank (10). The pressure detection element (110) is electrically connected to the controller (100).

9. The vegetable oil storage device according to claim 7, characterized in that, The vegetable oil storage device also includes a temperature monitoring device (120) for monitoring the internal temperature of the oil storage tank (10) and a liquid level monitoring device (130) for monitoring the internal liquid level of the oil storage tank (10), both of which are electrically connected to the controller (100).

10. The vegetable oil storage device according to claim 7, characterized in that, The oil storage tank (10) is also provided with a feed inlet, and the discharge outlet is connected to the feed inlet of the oil storage tank (10) through a connecting pipe (30); The connecting pipeline (30) is equipped with a feed valve (140), which is electrically connected to the controller (100).

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