Fruit and vegetable sterilization and preservation device and method

Abstract

The present invention provides a fruit and vegetable sterilization and preservation device and method thereof, belonging to the technical field of fruit and vegetable preservation. The present invention is provided with a hydrogen collection cover on a hydroxyl generator and connected to a hydrogen-rich coating liquid immersion tank and a pressurized hydrogen film-forming chamber. At the same time, the hydroxyl generator is also connected to a hydroxyl water sterilization tank, so that the generated hydroxyl water can enter the hydroxyl water sterilization tank for sterilization treatment, and at the same time, hydrogen recycling is also realized. Through the immersion treatment of the hydrogen-rich coating liquid immersion tank and the film formation in the pressurized hydrogen film-forming chamber, a film locked with hydrogen is formed on the surface of fruits and vegetables, thereby improving the preservation effect. In addition, the sterilization and preservation method includes the steps of preparing a hydrogen-rich coating liquid and creating a pressurized hydrogen environment, cleaning and sterilization, coating liquid immersion, film-forming and hydrogen locking, and refrigeration and preservation, which not only increases the solubility of hydrogen, but also prevents the escape of hydrogen during film formation, ensures that the surface of fruits and vegetables can be wrapped by hydrogen, prolongs the time for hydrogen to act on fruits and vegetables, and has a better preservation effect.

Description

Technical Field

[0001] The invention relates to the technical field of fruit and vegetable preservation, and in particular to a fruit and vegetable sterilization and preservation device and a method thereof. Background Art

[0002] During the circulation process of agricultural products, fruits and vegetables need attention for their hygiene, safety and nutritional effects due to the influence of the growth and storage environment, as well as the long storage and transportation time, to ensure that the agricultural products can maintain their safety and nutritional value from the field to the table.

[0003] At present, the main method for preserving fruits and vegetables on the market is hydroxyl water technology. By electrifying the hydroxyl generator, a particle shower effect is generated, which causes water molecules to split into hydroxyl free radicals (·OH), etc., which can efficiently and safely degrade and kill agricultural residues and bacteria on fruits and vegetables, extend the shelf life of fruits and vegetables, avoid the problem of nutrient loss caused by rapid corruption of fruits and vegetables, and improve the safety and nutritional value of fruits and vegetables. In addition, the raw material used is a clean resource - water, without adding any form of chemical substances, which is harmless to the human body and the environment, and is safer and highly respected by the industry. However, the existing hydroxyl generator is an exposed structure, which only utilizes the hydroxyl free radicals generated during its working process, and the hydrogen generated at the same time is directly released into the air, which has a problem of resource waste. In addition, there is no other protection measure for fruits and vegetables. After the fruits and vegetables leave the hydrogen environment, the hydrogen on their skin will be quickly released into the air, the protection time is short, the preservation effect is limited, and it cannot meet the long-term preservation needs, and the shelf life is not long enough. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention aims to provide a fruit and vegetable sterilization and preservation device and method thereof, wherein a hydroxyl generating device with a hydrogen collection cover is provided, which can not only sterilize the fruits and vegetables, but also collect the generated hydrogen. In addition, the collected hydrogen is added to the coating liquid to form a hydrogen-rich coating liquid, thereby improving the solubility of hydrogen and increasing the retention time of hydrogen, thereby realizing the immersion treatment of fruits and vegetables and improving the preservation effect. A closed space is formed by hydrogen pressurization, and the fruit and vegetable are allowed to stand to form a film under the condition of closed pressurized hydrogen, and the hydrogen is locked between the formed film and the epidermis of the fruit and vegetable, so that even after the fruit and vegetable leave the hydrogen-rich coating liquid, the hydrogen still acts on the fruit and vegetable, so that the hydrogen can continue to act on the fruit and vegetable, resulting in a better preservation effect and a longer shelf life.

[0005] The specific technical solutions are as follows:

[0006] A fruit and vegetable sterilization and preservation device has the following characteristics, including:

[0007] A hydroxyl generator, wherein the hydroxyl generator has a clean water inlet and a water hydroxyl outlet, and the hydroxyl generator is covered with a hydrogen collecting cover with a hydrogen outlet;

[0008] A hydroxyl water sterilization tank, which is connected to the water hydroxyl outlet of the hydroxyl generator;

[0009] A hydrogen-rich coating liquid immersion tank, wherein the hydrogen-rich coating liquid immersion tank is connected to the hydrogen outlet;

[0010] The pressurized hydrogen film-forming chamber is a sealed chamber, the pressurized hydrogen film-forming chamber is connected to the hydrogen outlet and / or the external hydrogen supply equipment, the hydrogen-rich coating liquid immersion tank is arranged in the pressurized hydrogen film-forming chamber, and the pressurized hydrogen film-forming chamber has a film-forming platform.

[0011] The above-mentioned fruit and vegetable sterilization and preservation device, wherein the pressurized hydrogen film-forming chamber includes a box body, a sealing cover, a lifting net and a film-replenishing nozzle, and the two ends of the box body are respectively provided with an inlet and a removal port, and the inlet and the removal port are both provided with an openable and closable sealing cover, the hydrogen-rich coating liquid immersion tank and the film-forming platform are both arranged in the lower part of the box body and are respectively close to the inlet and the removal port, and at the same time, the lifting net is arranged in the hydrogen-rich coating liquid immersion tank and is close to one end of the film-forming platform and performs a lifting movement between below the liquid surface of the hydrogen-rich coating liquid and the top surface of the film-forming platform, and the height of the lifting net close to the film-forming platform on one side is lower than that on the other side, the film-replenishing nozzle is arranged at the top of the box body and faces the film-forming platform, and the film-replenishing nozzle pipeline is connected to the hydrogen-rich coating liquid immersion tank.

[0012] A method for sterilizing and preserving fruits and vegetables has the following characteristics and uses the above-mentioned device for sterilizing and preserving fruits and vegetables, and includes the following steps:

[0013] Step S1, preparing a hydrogen-rich coating liquid and creating a pressurized hydrogen environment;

[0014] The prepared coating liquid is placed in a hydrogen-rich coating liquid immersion tank, the hydroxyl generator is started, hydrogen is introduced into the coating liquid to form a hydrogen-rich coating liquid, and at the same time, hydrogen is introduced into the pressurized hydrogen film-forming chamber to form a hydrogen environment;

[0015] Step S2, cleaning and sterilization;

[0016] The hydroxyl water generated by the hydroxyl generator is passed into the hydroxyl water sterilization pool, and the fruits and vegetables to be processed are placed in the hydroxyl water sterilization pool for cleaning and sterilization, and then dried after cleaning and sterilization;

[0017] Step S3, coating liquid immersion;

[0018] Put the dried fruits and vegetables into the hydrogen-rich coating liquid immersion tank for immersion for a predetermined time;

[0019] Step S4, forming a film to lock hydrogen;

[0020] The fruits and vegetables after immersion are taken out from the hydrogen-rich coating liquid immersion tank and placed on the film-forming platform, waiting for the hydrogen-rich coating liquid coated on the surface of the fruits and vegetables to dry and form a film under natural conditions;

[0021] Step S5, refrigeration and preservation;

[0022] Store the fruits and vegetables with surface film in a refrigerated device.

[0023] In the above-mentioned method for sterilizing and preserving fruits and vegetables, the method for preparing the coating liquid is to dissolve a predetermined amount of chitosan in an acetic acid aqueous solution of a predetermined concentration to form a coating liquid with a chitosan mass percentage of 0.5-1.5% and an acetic acid mass percentage of 1%.

[0024] In the above-mentioned method for sterilizing and preserving fruits and vegetables, the concentration of hydrogen in the hydrogen-rich coating liquid is 0.5-2 mmol / L.

[0025] In the above-mentioned method for sterilizing and preserving fruits and vegetables, in step S3, the time for immersing the dried fruits and vegetables in the hydrogen-rich coating liquid immersion tank is 3-5 minutes.

[0026] In the above-mentioned method for sterilizing and preserving fruits and vegetables, in step S1, when hydrogen is introduced into the coating liquid to form a hydrogen-rich coating liquid, the temperature of the coating liquid is adjusted to 5-10°C.

[0027] In the above-mentioned method for sterilizing and preserving fruits and vegetables, in step S1, after hydrogen is introduced into the pressurized hydrogen film-forming chamber, the pressure in the pressurized hydrogen film-forming chamber is controlled to be 0.5-0.8Mpa.

[0028] In the above-mentioned method for sterilizing and preserving fruits and vegetables, in step S4, while waiting for the hydrogen-rich coating liquid coating the surface of the fruits and vegetables to dry and form a film under natural conditions, the pressure in the pressurized hydrogen film-forming chamber is gradually reduced until it is completely dry and forms a film.

[0029] In the above-mentioned method for sterilizing and preserving fruits and vegetables, in step S3, before placing the air-dried fruits and vegetables into the hydrogen-rich coating liquid immersion tank for immersion, the hydrogen-rich coating liquid needs to be foamed.

[0030] The positive effects of the above technical solution are:

[0031] The above-mentioned fruit and vegetable sterilization and preservation device and method, by arranging a hydrogen collection cover on the hydroxyl generating device, can not only use the generated hydroxyl water for sterilizing fruits and vegetables, but also collect the generated hydrogen and pass it into the coating liquid to form a hydrogen-rich coating liquid, thereby improving the solubility of hydrogen, increasing the retention time of hydrogen, and improving the immersion treatment effect of fruits and vegetables in the hydrogen-rich coating liquid, and the preservation effect is better; at the same time, the collected hydrogen can also act on the pressurized hydrogen film-forming chamber to form a closed space filled with hydrogen, so that after the fruits and vegetables that have been immersed in the treatment are taken out and left to stand for film formation, the hydrogen can be locked between the formed film and the fruit and vegetable skin, so that even if the fruits and vegetables leave the hydrogen-rich coating liquid, there is still hydrogen acting on the fruits and vegetables, which prolongs the time that hydrogen acts on the fruits and vegetables, improves the preservation effect on the fruits and vegetables, and prolongs the shelf life of the fruits and vegetables. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a fruit and vegetable sterilization and preservation device of the present invention;

[0033] Figure 2 A structural diagram of a pressurized hydrogen film-forming chamber according to a preferred embodiment of the present invention;

[0034] Figure 3 The present invention is a flow chart of a method for sterilizing and preserving fruits and vegetables.

[0035] In the attached figure: 1. Hydroxyl generator; 11. Hydrogen collecting hood; 2. Hydroxyl water sterilization tank; 3. Hydrogen-rich coating liquid immersion tank; 4. Pressurized hydrogen film-forming chamber; 41. Box; 42. Sealing cover; 43. Lifting net; 44. Film-replenishing nozzle; 5. Film-forming platform. Implementation

[0036] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments are combined with the attached Figure 1 To Attachment Figure 3 The technical solution provided by the present invention is described in detail, but the following content is not intended to limit the present invention.

[0037] Figure 1 It is a structural schematic diagram of a fruit and vegetable sterilization and preservation device of the present invention; Figure 2 FIG. 1 is a structural diagram of a pressurized hydrogen film-forming chamber according to a preferred embodiment of the present invention. Figure 1 and Figure 2 As shown, the fruit and vegetable sterilization and preservation device and method provided in this embodiment include: a hydroxyl generator 1, a hydroxyl water sterilization tank 2, a hydrogen-rich coating liquid immersion tank 3 and a pressurized hydrogen film-forming chamber 4.

[0038] Specifically, the hydroxyl generator 1 is provided with a clean water inlet and a water hydroxyl outlet. At this time, an external clean water source is connected to the clean water inlet, clean water enters the hydroxyl generator 1 from the clean water inlet, and the generated hydroxyl water flows out from the water hydroxyl outlet, serving as a supply structure for hydroxyl water. In addition, the hydroxyl generator 1 is covered with a hydrogen collection cover 11 with a hydrogen outlet, that is, when the hydroxyl generator 1 is working, the generated hydrogen will enter the hydrogen collection cover 11, realizing the recovery of the generated hydrogen, preventing the waste of hydrogen, and saving resources.

[0039] Specifically, the hydroxyl water sterilization pool 2 is connected to the water hydroxyl outlet of the hydroxyl generator 1, that is, the hydroxyl generator 1 and the hydroxyl water sterilization pool 2 are connected, so that the hydroxyl water generated by the hydroxyl generator 1 can flow into the hydroxyl water sterilization pool 2, providing conditions for the subsequent sterilization of fruits and vegetables in the hydroxyl water sterilization pool 2.

[0040] Specifically, the hydrogen-rich coating liquid immersion tank 3 is connected to the hydrogen outlet, that is, the hydrogen recovered by the hydrogen collecting cover 11 can be introduced into the hydrogen-rich coating liquid immersion tank 3, so as to meet the subsequent dissolution of hydrogen in the coating liquid to form a hydrogen-rich coating liquid, and provide conditions for forming bubbles filled with hydrogen in the hydrogen-rich coating liquid.

[0041] Specifically, the pressurized hydrogen film-forming chamber 4 is set as a sealed chamber, which provides conditions for the subsequent dipping operation of fruits and vegetables and the process of forming the film on fruits and vegetables in an environment full of hydrogen. At the same time, the pressurized hydrogen film-forming chamber 4 is connected to the hydrogen outlet and / or the external hydrogen supply equipment, so that the hydrogen collected by the hydrogen collection cover 11 can enter the pressurized hydrogen film-forming chamber 4, so as to realize the utilization of the collected hydrogen and meet the demand for resource recycling. In addition, the hydrogen-rich coating liquid immersion tank 3 is arranged in the pressurized hydrogen film-forming chamber 4, so that the hydrogen-rich coating liquid immersion tank 3 is in a hydrogen-wrapped state, which not only prevents the subsequent fruits and vegetables taken out of the hydrogen-rich coating liquid immersion tank 3 from being separated from the hydrogen environment and causing the hydrogen in the film to escape quickly, but also increases the retention time of hydrogen, improves the solubility of hydrogen in the coating liquid, and increases the hydrogen content of the coating liquid. In addition, the pressurized hydrogen film-forming chamber 4 has a film-forming platform 5, so that the film-forming platform 5 is also in a state of being wrapped by hydrogen, so that the fruits and vegetables subsequently placed on the film-forming platform 5 are always wrapped by hydrogen, so that the coating liquid on the fruits and vegetables can form a film under the condition of being full of hydrogen, and the hydrogen is locked between the film and the epidermis of the fruits and vegetables, so that the subsequent fruits and vegetables can still lock the hydrogen even after leaving the hydrogen-rich coating liquid immersion pool 3, so that the hydrogen continues to wrap the fruits and vegetables, thereby achieving the preservation of the fruits and vegetables.

[0042] More specifically, the pressurized hydrogen film-forming chamber 4 includes a box body 41, a sealing cover 42, a lifting net 43 and a film-replenishing nozzle 44. At this time, the two ends of the box body 41 are respectively provided with an inlet and a removal port to facilitate the entry and removal of fruits and vegetables. In addition, a seal cover 42 that can be opened and closed is provided on the inlet and the removal port of the box body 41, that is, when fruits and vegetables need to enter and be removed, the corresponding seal cover 42 can be opened to meet the use requirements. At the same time, the box body 41 can be closed to form an independent sealed space, which provides conditions for the subsequent hydrogen sealing. At the same time, the hydrogen-rich coating liquid immersion pool 3 and the film-forming platform 5 are both arranged in the lower part of the box body 41 and are respectively close to the inlet and the removal port, so that the hydrogen-rich coating liquid immersion pool 3 and the film-forming platform 5 can be in a sealed space wrapped by hydrogen. At the same time, the fruits and vegetables entering from the inlet can enter the hydrogen-rich coating liquid immersion pool 3, and the fruits and vegetables on the film-forming platform 5 can be taken out from the removal port, and the structural design is more reasonable. At the same time, the lifting net 43 is arranged in the hydrogen-rich coating liquid immersion pool 3 and close to one end of the film-forming platform 5, so that the lifting net 43 can sink to the bottom of the hydrogen-rich coating liquid immersion pool 3, thereby lifting the fruits and vegetables immersed in the hydrogen-rich coating liquid immersion pool 3 through the lifting net 43, so that the fruits and vegetables are separated from the hydrogen-rich coating liquid. At this time, the lifting net 43 performs a lifting and lowering movement between the liquid surface of the hydrogen-rich coating liquid and the top surface of the film-forming platform 5, and the fruits and vegetables on the lifting net 43 can be lifted to a height flush with the top surface of the film-forming platform 5. At the same time, the height of the lifting net 43 on one side close to the film-forming platform 5 is lower than the height of the other side, so that the fruits and vegetables lifted by the lifting net 43 can automatically roll toward the film-forming platform 5 along the inclined direction, thereby satisfying the transfer of fruits and vegetables between the hydrogen-rich coating liquid immersion pool 3 and the film-forming platform 5. In addition, the film repair nozzle 44 is arranged on the top of the box 41 and faces the film forming platform 5, and the pipeline of the film repair nozzle 44 is connected to the hydrogen-rich coating liquid immersion pool 3, that is, the composition of the hydrogen-rich coating liquid sprayed by the film repair nozzle 44 is the same as the composition of the hydrogen-rich coating liquid covering the surface of the fruits and vegetables themselves, so that after the fruits and vegetables roll on the film forming platform 5, if the hydrogen-rich coating liquid in some areas is damaged, it can be repaired in time by the film repair nozzle 44, so that the film formed on the surface of the fruits and vegetables can be completed, ensuring the hydrogen locking effect. It is worth pointing out that when fruits and vegetables roll from the lifting net 43 to the film-forming platform 5, the hydrogen-rich coating liquid on the parts of the fruits and vegetables that are not in contact with the film-forming platform 5 is first allowed to dry and form a film, while the hydrogen-rich coating liquid on the parts in contact with the film-forming platform 5 will be destroyed and missing, and then the film-forming platform 5 is controlled to be slightly tilted, so that the fruits and vegetables roll at a predetermined angle, so that the parts of the fruits and vegetables that have dried and formed a film roll to contact the film-forming platform 5, and the parts that originally contacted the film-forming platform 5 roll to an upward state. At this time, the hydrogen-rich coating liquid is sprayed toward the surface of the fruits and vegetables through the film-replenishing nozzle 44 to replenish the hydrogen-rich coating liquid on the parts that originally contacted the film-forming platform 5. After drying and forming a film, the integrity of the film on the surface of the fruits and vegetables can be achieved, and the hydrogen in the film can be completely locked, and the structural design is more reasonable.

[0043] Figure 3 This is a flow chart of a method for sterilizing and preserving fruits and vegetables according to the present invention. Figure 3 As shown, this embodiment also provides a method for sterilizing and preserving fruits and vegetables, using the above-mentioned fruit and vegetable sterilizing and preserving device. Specifically, the method for sterilizing and preserving fruits and vegetables includes the following steps:

[0044] Step S1, preparing a hydrogen-rich coating liquid and creating a pressurized hydrogen environment;

[0045] First, the chitosan of Yu Dongliang is dissolved in an acetic acid aqueous solution of a predetermined concentration to prepare a coating liquid. The solubility of hydrogen is increased by the coating liquid, which provides conditions for subsequent hydrogen to fully contact fruits and vegetables. At this time, in the prepared coating liquid, when calculated by mass percentage, the chitosan mass percentage is 0.5-1.5%, the mass percentage of acetic acid is 1%, and the rest is water, and the hydrogen dissolving effect is better. After the coating liquid is prepared, the prepared coating liquid is placed in a hydrogen-rich coating liquid immersion tank 3. At this time, the hydroxyl generator 1 is started, and hydrogen is passed into the coating liquid to form a hydrogen-rich coating liquid, ensuring that a certain concentration of hydrogen can be incorporated into the hydrogen-rich coating liquid. Preferably, the hydrogen concentration in the hydrogen-rich coating liquid is controlled to be 0.5-2mmol / L, which meets the needs of fruit and vegetable preservation. At the same time, hydrogen is passed into the pressurized hydrogen film-forming chamber 4, so that an environment full of hydrogen is formed in the pressurized hydrogen film-forming chamber 4, thereby providing conditions for immersion treatment and film-forming hydrogen locking. It is worth pointing out that when hydrogen is introduced into the pressurized hydrogen film-forming chamber 4, if the amount of hydrogen produced by the hydroxyl generator 1 is insufficient, an external hydrogen supply device is required to provide sufficient hydrogen to ensure the hydrogen content of the hydrogen-rich coating liquid and the hydrogen content in the pressurized hydrogen film-forming chamber 4.

[0046] More specifically, when hydrogen is introduced into the coating liquid to form a hydrogen-rich coating liquid, the temperature of the coating liquid needs to be adjusted to 5-10°C. Preferably, a cooling pipeline is provided at the bottom of the hydrogen-rich coating liquid immersion tank 3, and the refrigerant exchanges heat with the coating liquid in the hydrogen-rich coating liquid immersion tank 3 through the cooling pipeline, thereby reducing the temperature of the coating liquid and controlling the temperature of the coating liquid to 7°C. By adjusting the temperature of the coating liquid, the coating liquid can become more viscous, thereby increasing the residence time of hydrogen, increasing the solubility of hydrogen, and improving the preservation effect.

[0047] More specifically, after hydrogen is introduced into the pressurized hydrogen film-forming chamber 4, the pressure value in the pressurized hydrogen film-forming chamber 4 is controlled to be 0.5-0.8MPa. Preferably, the pressure value in the pressurized hydrogen film-forming chamber 4 is 0.6MPa, which can make the pressurized hydrogen film-forming chamber 4 in a slightly positive pressure state, thereby preventing external air from leaking into the pressurized hydrogen film-forming chamber 4 and affecting the preservation effect, and also avoiding the problem of other gases mixing into the formed film during the film-forming process.

[0048] Step S2, cleaning and sterilization;

[0049] The hydroxyl water produced by the hydroxyl generator 1 is passed into the hydroxyl water sterilization pool 2, and the fruits and vegetables to be processed are placed in the hydroxyl water sterilization pool 2 for cleaning and sterilization. After cleaning and sterilization, the fruits and vegetables are taken out and dried to complete the sterilization treatment of the over-plastic.

[0050] Step S3, coating liquid immersion;

[0051] The dried fruits and vegetables are placed in the hydrogen-rich coating liquid immersion pool 3 for immersion, and the fruits and vegetables are immersed in the hydrogen-rich coating liquid or rolled in the hydrogen-rich coating liquid, so that the surfaces of the fruits and vegetables are completely wrapped by the hydrogen-rich coating liquid, which provides conditions for subsequent film formation on the entire surface of the fruits and vegetables. In addition, the immersion time of fruits and vegetables in the hydrogen-rich coating liquid is 3-5 minutes, preferably, the immersion time is 4 minutes, which can ensure the processing efficiency while allowing the epidermis of the fruits and vegetables to fully contact with the hydrogen-rich coating liquid and be wrapped by the hydrogen-rich coating liquid to meet the processing requirements.

[0052] In addition, before the dried fruits and vegetables are placed in the hydrogen-rich coating liquid immersion tank 3 for immersion, the hydrogen-rich coating liquid needs to undergo a bubbling operation, that is, a bubbling wheel is provided in the hydrogen-rich coating liquid immersion tank 3. Preferably, the bubbling wheel is a structure in which a silicone sheet is provided on a silicone roller, which can not only stir the hydrogen-rich coating liquid to make more hydrogen in the environment dissolve in the coating liquid, but also make more small bubbles exist in the hydrogen-rich coating liquid, thereby providing conditions for locking more hydrogen after subsequent film formation. In addition, it can also prevent damage to the skin of fruits and vegetables, and the structural design is more reasonable.

[0053] Step S4, forming a film to lock hydrogen;

[0054] The immersed fruits and vegetables are taken out from the hydrogen-rich coating liquid immersion pool 3 and placed on the film-forming platform 5, waiting for the hydrogen-rich coating liquid coated on the surface of the fruits and vegetables to dry and form a film under natural conditions. It is worth pointing out that the natural conditions are other environmental conditions except the external environment wrapped by hydrogen, such as temperature, humidity, etc., which are the same or similar to the natural conditions, so that the film-forming process of the hydrogen-rich coating liquid on the excessive surface can be carried out in an environment filled with hydrogen, so that the inner and outer layers of the hydrogen-rich coating liquid are both hydrogen, avoiding the problem of hydrogen diffusing and escaping too quickly when the hydrogen-rich coating liquid is not completely dry to form a film, and meeting the film-forming hydrogen locking requirements.

[0055] Preferably, while waiting for the hydrogen-rich coating liquid coating the surface of fruits and vegetables to dry and form a film under natural conditions, the pressure in the pressurized hydrogen film-forming chamber 4 can be gradually reduced until it is completely dry and forms a film. That is, when the hydrogen-rich coating liquid is not completely dry, the pressure outside the membrane is reduced, so that the pressure inside the membrane is relatively increased and the membrane is slightly expanded, so that the pressure inside the membrane is gradually reduced until the membrane is dry and formed and no longer changes. When the fruits and vegetables covered with the cover film are subsequently taken out to the outside, a micro-negative pressure structure is formed inside the membrane, thereby further suppressing the problem of hydrogen in the membrane escaping through the membrane, further extending the time for hydrogen to act on fruits and vegetables, and achieving a better preservation effect.

[0056] Step S5, refrigeration and preservation;

[0057] The fruits and vegetables with the film formed on their surfaces are stored in refrigerated equipment to achieve refrigerated storage and further extend the shelf life of the fruits and vegetables.

[0058] The fruit and vegetable sterilization and preservation device and method provided in this embodiment include a hydroxyl generator 1, a hydroxyl water sterilization pool 2, a hydrogen-rich coating liquid immersion pool 3 and a pressurized hydrogen film-forming chamber 4. A hydrogen collection cover 11 is provided on the hydroxyl generator 1 and connected to the hydrogen-rich coating liquid immersion pool 3 and the pressurized hydrogen film-forming chamber 4. At the same time, the hydroxyl generator 1 is also connected to the hydroxyl water sterilization pool 2, so that the generated hydroxyl water can enter the hydroxyl water sterilization pool 2 for sterilization treatment, and the hydrogen recovery and utilization is also realized. Through the immersion treatment in the hydrogen-rich coating liquid immersion pool 3 and the film formation in the pressurized hydrogen film-forming chamber 4, a film locked with hydrogen is formed on the surface of fruits and vegetables to improve the preservation effect. In addition, the method includes the steps of preparing hydrogen-rich coating liquid and creating a pressurized hydrogen environment, cleaning and sterilization, coating liquid immersion, film formation and hydrogen locking, and refrigeration preservation, which not only increases the solubility of hydrogen, but also prevents the escape of hydrogen during film formation, ensures that the surface of fruits and vegetables can be wrapped by hydrogen, prolongs the time for hydrogen to act on fruits and vegetables, and has a better preservation effect.

[0059] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A fruit and vegetable sterilization and preservation device, characterized in that: include: A hydroxyl generator, wherein the hydroxyl generator has a clean water inlet and a water hydroxyl outlet, and the hydroxyl generator is covered with a hydrogen collecting cover with a hydrogen outlet; A hydroxyl water sterilization tank, the hydroxyl water sterilization tank is connected to the water hydroxyl outlet of the hydroxyl generator; A hydrogen-rich coating liquid immersion tank, wherein the hydrogen-rich coating liquid immersion tank is connected to the hydrogen outlet; A pressurized hydrogen film-forming chamber, wherein the pressurized hydrogen film-forming chamber is a sealed chamber, the pressurized hydrogen film-forming chamber is connected to the hydrogen outlet and / or an external hydrogen supply device, the hydrogen-rich coating liquid immersion tank is arranged in the pressurized hydrogen film-forming chamber, and the pressurized hydrogen film-forming chamber has a film-forming platform; The pressurized hydrogen film-forming chamber includes a box body, a sealing cover, a lifting net and a film-repairing nozzle. An inlet and a removal port are respectively provided at both ends of the box body. The inlet and the removal port are both provided with the sealing cover that can be opened and closed. The hydrogen-rich film-forming liquid immersion tank and the film-forming platform are both arranged in the lower part of the box body and are respectively close to the inlet and the removal port. At the same time, the lifting net is arranged in the hydrogen-rich film-forming liquid immersion tank and is close to one end of the film-forming platform, and makes a lifting movement between below the liquid surface of the hydrogen-rich film-forming liquid and the top surface of the film-forming platform, and the height of the lifting net close to the film-forming platform on one side is lower than that on the other side. The film-repairing nozzle is arranged at the top of the box body and faces the film-forming platform, and the film-repairing nozzle pipeline is connected to the hydrogen-rich film-forming liquid immersion tank.

2. A method for sterilizing and preserving fruits and vegetables, characterized in that: The fruit and vegetable sterilization and preservation device according to claim 1 is used, comprising the following steps: Step S1, preparing a hydrogen-rich coating liquid and creating a pressurized hydrogen environment; The prepared coating liquid is placed in the hydrogen-rich coating liquid immersion tank, the hydroxyl generator is started, hydrogen is introduced into the coating liquid to form a hydrogen-rich coating liquid, and at the same time, the hydrogen is introduced into the pressurized hydrogen film-forming chamber to form a hydrogen environment; Step S2, cleaning and sterilization; The hydroxyl water generated by the hydroxyl generator is passed into the hydroxyl water sterilization tank, the fruits and vegetables to be processed are placed in the hydroxyl water sterilization tank for cleaning and sterilization, and then dried after cleaning and sterilization; Step S3, coating liquid immersion; Put the dried fruits and vegetables into the hydrogen-rich coating liquid immersion tank for immersion for a predetermined time; Step S4, forming a film to lock hydrogen; The fruits and vegetables after immersion are taken out from the hydrogen-rich coating liquid immersion tank and placed on the film-forming platform, waiting for the hydrogen-rich coating liquid coated on the surface of the fruits and vegetables to dry and form a film under natural conditions; Step S5, refrigeration and preservation; Store the fruits and vegetables with surface film in a refrigerated device.

3. The method for sterilizing and preserving fruits and vegetables according to claim 2, characterized in that: The method for preparing the coating liquid is to dissolve a predetermined amount of chitosan in an acetic acid aqueous solution of a predetermined concentration to form the coating liquid with a chitosan mass percentage of 0.5-1.5% and an acetic acid mass percentage of 1%.

4. The method for sterilizing and preserving fruits and vegetables according to claim 2, characterized in that: The hydrogen concentration in the hydrogen-rich coating liquid is 0.5-2 mmol / L.

5. The method for sterilizing and preserving fruits and vegetables according to claim 2, characterized in that: In step S3, the dried fruits and vegetables are immersed in the hydrogen-rich coating liquid immersion tank for 3-5 minutes.

6. The method for sterilizing and preserving fruits and vegetables according to claim 2, characterized in that: In the step S1, when the hydrogen gas is introduced into the coating liquid to form the hydrogen-rich coating liquid, the temperature of the coating liquid is adjusted to 5-10°C.

7. The method for sterilizing and preserving fruits and vegetables according to claim 2, characterized in that: In the step S1, after the hydrogen is introduced into the pressurized hydrogen film-forming chamber, the pressure in the pressurized hydrogen film-forming chamber is controlled to be 0.5-0.8 MPa.

8. The method for sterilizing and preserving fruits and vegetables according to claim 2, characterized in that: In the step S4, while waiting for the hydrogen-rich coating liquid coating the surface of fruits and vegetables to dry and form a film under natural conditions, the pressure in the pressurized hydrogen film-forming chamber is gradually reduced until it is completely dry and forms a film.

9. The method for sterilizing and preserving fruits and vegetables according to claim 2, characterized in that: In the step S3, before the air-dried fruits and vegetables are placed in the hydrogen-rich coating liquid immersion tank for immersion, the hydrogen-rich coating liquid needs to be foamed.

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