Litchi respiration inhibition and humidity regulation composite fresh-keeping device

Abstract

The present application belongs to the field of fresh-keeping device, and particularly relates to a litchi respiration inhibition and humidity regulation composite fresh-keeping device, which comprises: a cold storage, a pair of adsorption assemblies arranged on the top of the cold storage and comprising a shell and an adsorption body arranged in the shell; a cooling assembly arranged on the cold storage and comprising a first air pipe, a centrifugal fan, an evaporator and a second air pipe, wherein the centrifugal fan is communicated with one adsorption assembly between an input end and the first air pipe and is communicated with a three-way pipe at an output end, one end of the three-way pipe is communicated with another adsorption assembly and the other end is communicated with the input end of the evaporator, the output end of the evaporator is communicated with the second air pipe, and the first air pipe and the second air pipe are arranged through the cold storage; a humidity regulating assembly arranged in the cold storage and comprising a pipeline; and an air conditioning assembly arranged on the cold storage and comprising a plurality of third air pipes and fourth air pipes, wherein the third air pipes and the fourth air pipes are arranged through the side wall of the cold storage.

Description

Technical Field

[0001] This invention relates to the field of preservation devices, specifically a combined preservation device for lychee respiration inhibition and humidity regulation. Background Technology

[0002] Lychee undergoes extremely vigorous physiological metabolism after harvest. Its peel is thin and rich in polyphenol oxidase. At room temperature, it is very easy to deteriorate rapidly due to dehydration and browning and infection by pathogens. Therefore, it must be pre-cooled immediately after harvest to remove field heat and be transferred to a low-temperature environment for storage as soon as possible to inhibit its strong respiration rate and ethylene production, thereby delaying aging and maintaining quality.

[0003] Currently, the most widely used method is still the traditional mechanical refrigeration method, which maintains the cold storage temperature between 3°C and 5°C using an ammonia or Freon refrigeration system. The advantages of this method are its mature technology, relatively controllable construction and operating costs, and its ability to effectively extend the shelf life of lychees by about one month.

[0004] The aforementioned existing technology has the following drawbacks: the active respiration of lychees will continuously consume the limited oxygen in the storage room and release a large amount of carbon dioxide. As the storage time is extended, carbon dioxide will gradually accumulate, and the concentration may rise to more than 10%. This imbalance will not only further inhibit the normal respiration of lychees, but may also induce anaerobic respiration, producing off-flavor substances such as alcohol, causing the flesh to soften and the flavor to deteriorate. At the same time, the peel will brown faster due to lack of oxygen. Ultimately, the low-temperature environment originally intended for preservation will instead exacerbate the deterioration of fruit quality due to the imbalance of gas ratios.

[0005] Therefore, a combined preservation device for lychee respiration inhibition and humidity regulation is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A lychee respiration inhibition and humidity regulation composite preservation device, comprising: a cold storage; a pair of adsorption components disposed on the top of the cold storage, including an outer shell and an adsorbent located inside the outer shell; a cooling component disposed on the cold storage, including a first air duct, a centrifugal fan, an evaporator, and a second air duct, wherein the input end of the centrifugal fan is connected to the first air duct by an adsorption component and the output end is connected to a T-junction pipe, one end of the T-junction pipe is connected to the input end of the evaporator by another adsorption component and the other end is connected to the input end of the evaporator, the output end of the evaporator is connected to the second air duct, and the first and second air ducts penetrate the cold storage; a humidity control component disposed inside the cold storage, including pipes; and a controlled atmosphere component disposed on the cold storage, including several third and fourth air ducts, wherein the third and fourth air ducts penetrate the side wall of the cold storage.

[0008] Preferably, the adsorption assembly further includes a pair of valve plates, a power source, and a synchronization plate, wherein the adsorption body is provided in pairs, the pair of valve plates are symmetrically distributed on both sides of the adsorption body, the synchronization plate is fixedly connected to the top of the pair of valve plates, and the output end of the power source is fixedly connected to the synchronization plate.

[0009] Preferably, it also includes a thermal regeneration mechanism for regenerating and desorbing the adsorbents inside the outer shell, including a hot air blower installed at the top of the cold storage; the output end of the hot air blower is connected to the cavity where a pair of adsorbents are located via a three-way pipe.

[0010] Preferably, the top of the cold storage is fixedly provided with a canopy, which is located directly above the cooling components.

[0011] Preferably, the humidity control component further includes a uniformly distributed ring evenly arranged at the bottom of the pipe in a horizontal direction; the bottom of the uniformly distributed ring is uniformly arranged with nozzles in a circumferential direction.

[0012] Preferably, the cooling assembly further includes an air outlet plate evenly arranged at the bottom of the second air duct in a horizontal direction; the air outlet plate is located inside the uniformly distributed ring and has an air outlet with an inclined orientation.

[0013] Preferably, the top of the inner wall of the cold storage is fixedly provided with several hangers; the hangers and the second air duct and pipe are fixedly connected.

[0014] Preferably, the controlled atmosphere assembly further includes: the fourth air duct is provided as a pair.

[0015] The advantages of this invention are: 1. The lychee respiration inhibition and humidity regulation composite preservation device of the present invention, by setting an adsorption component, can adsorb and remove excess carbon dioxide produced by lychees in the cold storage due to respiration, thereby facilitating the maintenance of a stable gas composition ratio in the cold storage.

[0016] 2. The litchi respiration inhibition and humidity regulation composite preservation device of the present invention sends a signal to the power source through the control module, causing the valve plate to move down and be in a falling state, which can exchange the states of a pair of adsorbents, that is, realize the online switching of adsorbents. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the main body of the present invention; Figure 2 This is a schematic diagram of the cold storage structure in this invention; Figure 3 This is a schematic diagram of the structure of the first air duct in this invention; Figure 4 This is a schematic diagram of the outer shell structure in this invention; Figure 5 This is a schematic diagram of the valve plate structure in this invention; Figure 6 This is a schematic diagram of the hanger structure in this invention.

[0019] In the diagram: 1. Cold storage; 12. First air duct; 13. Centrifugal fan; 14. Evaporator; 15. Second air duct; 16. Outer shell; 17. Adsorbent; 18. Pipeline; 19. Third air duct; 2. Valve plate; 22. Synchronization plate; 3. Hot air blower; 4. Ceiling; 5. Distribution ring; 6. Air outlet plate; 7. Hanger; 8. Fourth air duct. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Specific implementation examples are given below.

[0022] Please see Figures 1 to 6 As shown in the embodiment of the present invention, a lychee respiration inhibition and humidity regulation composite preservation device includes: a cold storage 1; a pair of adsorption components disposed on the top of the cold storage 1, including an outer shell 16 and an adsorbent 17 located inside the outer shell 16; a cooling component disposed on the cold storage 1, including a first air duct 12, a centrifugal fan 13, an evaporator 14, and a second air duct 15, wherein the input end of the centrifugal fan 13 is connected to the first air duct 12 by an adsorption component and the output end is connected to a three-way pipe, one end of the three-way pipe is connected to the input end of the evaporator 14 by another adsorption component and the other end is connected to the input end of the evaporator 14, and the output end of the evaporator 14 is connected to the second air duct 15, the first air duct 12 and the second air duct 15 are connected through the cold storage 1; a humidity regulating component disposed inside the cold storage 1, including a pipe 18; and a controlled atmosphere component disposed on the cold storage 1, including several third air ducts 19 and fourth air ducts 8, wherein the third air ducts 19 and fourth air ducts 8 are connected through the side wall of the cold storage 1. During operation, lychees can be stored in cold storage 1. During this process, the cooling components can be activated. Centrifugal fan 13, once started, draws hot air from cold storage 1 through the first duct 12. The airflow first passes through an adsorption component to adsorb moisture. The adsorbent 17 in this component can be a zeolite molecular sieve. The dehumidified airflow is then transported to evaporator 14 via centrifugal fan 13 and a three-way pipe. Evaporator 14 cools the airflow. The cooled, low-temperature airflow is then transported to cold storage 1 through the second duct 15, thus cooling the environment inside cold storage 1. Once the fruit storage in cold storage 1 reaches the designed storage capacity and is cooled to the optimal storage temperature, the storage can be sealed to generate nitrogen and reduce oxygen, allowing the fruits and vegetables to enter controlled atmosphere storage as soon as possible. Specifically, the end of the fourth duct 8 is connected to a gas analyzer, which contains an electrochemical sensor for monitoring oxygen concentration and a non-dispersive infrared sensor for monitoring carbon dioxide concentration. Several third ducts 19 are specifically configured in this application, one of which is connected to a nitrogen generator, allowing the airflow to enter cold storage 1. The system consists of three ducts: one duct (19) for displacing oxygen in cold storage 1, and another duct (8) for supplying nitrogen to replace oxygen in cold storage 1. One duct is connected to an oxygen generator or fan to introduce air or oxygen into cold storage 1 to maintain oxygen concentration. The last duct is directly connected to the outside to discharge the displaced air. A fourth duct (8) is connected to a gas analyzer to monitor oxygen and carbon dioxide concentrations in real time. Due to the respiration of lychees, oxygen in cold storage 1 is consumed, and carbon dioxide levels increase. When the oxygen concentration is below a preset value, the third duct (19) connected to the oxygen generator or fan can be opened. When the carbon dioxide concentration is above a preset value, the three-way valve at the output of centrifugal fan (13) can be switched to another adsorption component. The adsorbent (17) in this component can be activated carbon to adsorb carbon dioxide in the airflow, thereby reducing the carbon dioxide concentration in cold storage 1. By setting up the adsorption component, excess carbon dioxide produced by the respiration of lychees in cold storage 1 can be adsorbed and removed, thus facilitating the maintenance of a stable gas composition ratio within cold storage 1. In practice, the evaporator 14 is any mature technology application. Considering that while reducing oxygen, the concentration of carbon dioxide should be increased to the specified concentration as soon as possible, and that the increase of carbon dioxide concentration in the storage depends on the respiration of fruits and vegetables, when sealing the storage to reduce oxygen, the oxygen content of the air in the storage is usually reduced rapidly to a level several percentage points higher than the specified oxygen concentration, and then the respiration of fruits and vegetables is used to consume this excess oxygen.

[0023] Please see Figure 4 and Figure 5 As shown, the adsorption assembly also includes a pair of valve plates 2, a power source, and a synchronization plate 22. The adsorption bodies 17 are arranged in pairs, the pair of valve plates 2 are symmetrically distributed on both sides of the adsorption bodies 17, the synchronization plate 22 is fixedly connected to the top of the pair of valve plates 2, and the output end of the power source is fixedly connected to the synchronization plate 22. In its natural state, taking one of the adsorption components as an example, a pair of valve plates 2 can be suspended under the action of a power source (such as an electric actuator with a self-locking function) along with the synchronization plate 22. At this time, the gas path where one of the adsorbents 17 is located is in the working state, and the other adsorbent 17 is in the closed state. During the long-term operation of the device, the adsorbent 17 in the working state may become blocked. At this time, a signal can be sent to the power source through the control module to make the valve plate 2 move down and be in the landing state, so that the state of the pair of adsorbents 17 can be interchanged, that is, the online switching of adsorbents 17 can be realized. In specific implementation, for the dehumidification adsorption component, a humidity sensor can be installed in the output pipeline to monitor the humidity of the air after dehumidification in real time. When the humidity is higher than the preset value, it indicates that the adsorbent 17 is saturated. For the carbon dioxide removal adsorption component, a carbon dioxide gas analyzer can be installed in the output pipeline to monitor the carbon dioxide concentration in real time. When the concentration is higher than the preset value, it indicates that the adsorbent 17 is saturated.

[0024] Please see Figure 4 As shown, it also includes a thermal regeneration mechanism for regenerating and desorbing the adsorbent 17 inside the outer shell 16, including a hot air blower 3 installed at the top of the cold storage 1; the output end of the hot air blower 3 is connected to the cavity where a pair of adsorbents 17 are located through a three-way pipe. Taking one of the adsorption components as an example, after the working state of a pair of adsorbents 17 is switched, a signal can be sent to the hot air blower 3 through the control module to open the pipe corresponding to the saturated adsorbent 17 at its output end three-way pipe, so as to generate hot air and perform thermal desorption on the adsorbent 17 to remove the moisture or carbon dioxide adsorbed in the adsorbent 17. Excess hot air is sprayed out from the other side of the outer shell 16. The exhaust pipe on the other side should be equipped with a sealing valve, which is only opened during thermal regeneration and closed under normal conditions.

[0025] Please see Figure 1 As shown, a canopy 4 is fixedly installed on the top of the cold storage 1, and the canopy 4 is located directly above the cooling components; The canopy 4 provides physical protection for the cooling components on the top of the cold storage 1, reducing the impact of rainfall on these components when the unit is outdoors.

[0026] Please see Figure 6 As shown, the humidity control assembly also includes a uniformly distributed ring 5 evenly arranged at the bottom of the pipe 18 in the horizontal direction; the bottom of the uniformly distributed ring 5 is uniformly arranged with nozzles in the circumferential direction. The end of the pipe 18 can be connected to an atomizer, and a humidity sensor can be installed inside the cold storage 1 to monitor the air humidity inside the cold storage 1 in real time. In conjunction with the atomizer, the humidity balance inside the cold storage 1 is maintained. The mist generated by the atomizer can enter the uniform distribution ring 5 through the pipe 18 and be evenly distributed into the cold storage 1 by the nozzles evenly set at its bottom, thereby improving the uniformity of the mist distribution inside the cold storage 1.

[0027] Please see Figure 6 As shown, the cooling assembly also includes an air outlet plate 6 evenly arranged at the bottom of the second air duct 15 in a horizontal direction; the air outlet plate 6 is located inside the uniform distribution ring 5 and has an air outlet with an inclined orientation. The cooled low-temperature airflow can enter the interior of the second air duct 15 and the air outlet plate 6 through the evaporator 14, and then flow out obliquely through the air outlet at the bottom of the air outlet plate 6. These oblique airflows can turbulently circulate the moisture sprayed out by the air outlet plate 6 on the outer side of the uniform distribution ring 5, so that the moisture can be carried by the airflow, thereby improving the uniformity of moisture distribution in the cold storage 1.

[0028] Please see Figure 6 As shown, several hangers 7 are fixedly installed on the top of the inner wall of the cold storage 1; the hangers 7 and the second air duct 15 and pipe 18 are all fixedly connected. The hanger 7 is fixedly installed on the top of the inner wall of the cold storage 1 and is used to rigidly connect the second air duct 15 and the pipe 18, which can improve the stability of the second air duct 15 and the pipe 18 after installation.

[0029] Please see Figure 1 and Figure 2 As shown, the controlled atmosphere assembly also includes: the fourth air duct 8 is arranged in a pair; One of the fourth air ducts 8 is connected to a gas analyzer to maintain the gas concentration composition in the cold storage 1, while the other fourth air duct 8 is used for manual sampling. Specifically, air can be pumped out and sampled through the fourth air duct 8 by a manual air pump to manually calibrate and record the gas composition in the cold storage 1.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A combined preservation device for lychee respiration inhibition and humidity regulation, characterized in that: include: Cold storage (1) A pair of adsorption components are disposed on the top of the cold storage (1), including a shell (16) and an adsorbent (17) located inside the shell (16). The cooling components are installed on the cold storage (1) and include a first air duct (12), a centrifugal fan (13), an evaporator (14), and a second air duct (15). The centrifugal fan (13) has an adsorption component connected between its input end and the first air duct (12) and a three-way pipe connected to its output end. One end of the three-way pipe is connected to another adsorption component connected to the input end of the evaporator (14), and the other end is connected to the input end of the evaporator (14). The output end of the evaporator (14) is connected to the second air duct (15). The first air duct (12) and the second air duct (15) are installed through the cold storage (1). A humidity control unit is installed inside the cold storage (1) and includes pipes (18). The controlled atmosphere assembly is installed on the cold storage (1) and includes several third air ducts (19) and fourth air ducts (8), wherein the third air ducts (19) and fourth air ducts (8) are installed through the side wall of the cold storage (1).

2. The lychee respiration inhibition and humidity regulation composite preservation device according to claim 1, characterized in that: The adsorption assembly also includes a pair of valve plates (2), a power source, and a synchronization plate (22). The adsorbent (17) is set in pairs, and the pair of valve plates (2) are symmetrically distributed on both sides of the adsorbent (17). The synchronization plate (22) is fixedly connected to the top of the pair of valve plates (2), and the output end of the power source is fixedly connected to the synchronization plate (22).

3. The lychee respiration inhibition and humidity regulation composite preservation device according to claim 2, characterized in that: It also includes a thermal regeneration mechanism for regenerating and desorbing the adsorbents (17) inside the outer shell (16), including a hot air blower (3) installed on the top of the cold storage (1); the output end of the hot air blower (3) is connected to the cavity where a pair of adsorbents (17) are located through a three-way pipe.

4. The lychee respiration inhibition and humidity regulation composite preservation device according to claim 1, characterized in that: The top of the cold storage (1) is fixedly provided with a canopy (4), which is located directly above the cooling components.

5. The lychee respiration inhibition and humidity regulation composite preservation device according to claim 1, characterized in that: The humidity control assembly also includes a uniformly distributed ring (5) evenly arranged at the bottom of the pipe (18) in the horizontal direction; the bottom of the uniformly distributed ring (5) is uniformly arranged with nozzles in the circumferential direction.

6. The lychee respiration inhibition and humidity regulation composite preservation device according to claim 1, characterized in that: The cooling assembly also includes an air outlet plate (6) evenly arranged at the bottom of the second air duct (15) in a horizontal direction; the air outlet plate (6) is located inside the uniformly distributed ring (5) and has an air outlet with an inclined orientation.

7. The lychee respiration inhibition and humidity regulation composite preservation device according to claim 6, characterized in that: Several hangers (7) are fixedly installed on the top of the inner wall of the cold storage (1); the hangers (7) and the second air duct (15) and pipe (18) are all fixedly connected.

8. The lychee respiration inhibition and humidity regulation composite preservation device according to claim 7, characterized in that: The controlled atmosphere assembly also includes: the fourth air duct (8) is provided in pairs.

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