Portable damage-preventing and fresh-keeping carrying device for fruits in garden plot

Abstract

The invention discloses a garden portable fruit damage-preventing and fresh-keeping carrying device which comprises a carrying vehicle. The fruit cabin cover is arranged on the carrying vehicle, the inner space of the fruit cabin cover is used for placing fruits to be treated, and a fresh-keeping refrigerating system and an air guide system are arranged in the fruit cabin cover; the fresh-keeping refrigerating system comprises a first circulation loop and a secondary circulation loop, and the first circulation loop comprises a first compressor, a first condenser, a first throttling device and a first evaporator which are communicated through a first loop pipe and are communicated in a circulation mode. The fruit cabin cover has the beneficial effects that the fruit cabin cover for refrigerating the fruits is arranged on the carrying vehicle and used for refrigerating and fresh-keeping treatment after the fruits in the garden plot are picked, and the carrying vehicle can freely move under the driving of external force, so that the portability of refrigerating treatment is realized, the fruits are helped to be refrigerated in time after being picked and taken out of trees, and the working efficiency is improved. And the fresh-keeping treatment level of the fruits is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fruit transportation protection, and particularly relates to a portable fruit loss-preventing and fresh-keeping carrying device for gardens. BACKGROUND

[0002] With the development of social demand and agricultural economy, the demand for fruits is becoming more and more vigorous. Due to the geographical situation of China, there are a large number of mountainous and hilly terrains, for example, the southwest and central south regions of China.

[0003] A characteristic of mountainous and hilly terrains is that it is difficult to form a flat transportation network, and there is not enough space for timely storage, so fresh-keeping refrigeration in the storage link cannot be realized. However, in order to improve the freshness of fruits in the circulation and sales link, timely refrigeration and fresh-keeping after picking is essential. In order to solve this problem, in the actual research, a thought of dividing the whole into parts is provided, that is, a scattered, portable and small refrigeration device is used to replace the large refrigeration device in the traditional thought.

[0004] For fruit refrigeration and fresh-keeping, the ideal processing mode is to refrigerate immediately after picking. If fruits cannot be refrigerated and fresh-kept in time, research shows that it at least includes the following defects: 1. Due to respiration, heat is generated. If the stacking is too thick or the ventilation is poor, the heat cannot be dissipated, which will cause the temperature to rise; it will cause accelerated metabolism and maturation, high temperature will accelerate respiration, consume nutrients such as sugar and vitamins, and cause the taste of fruits to become poor and the flavor to be lost; it will cause ripening and softening, and some fruits (such as bananas and mangoes) will release ethylene due to high temperature, accelerate ripening and even over-ripening, and shorten the shelf life; it will cause the breeding of microorganisms, and high temperature and high humidity environment is easy to breed mold (such as penicillium and botrytis) and bacteria, and cause rot (such as mold of strawberries and grapes); it will cause physiological disorders, such as "tiger skin disease" of apples and "floating skin" of citrus fruits; 2. The influence of water on the surface of fruits is even worse, water provides conditions for the reproduction of microorganisms and chemical changes; fungal and bacterial infection, water droplets can breed mold (such as botrytis disease of grapes and green mold disease of citrus fruits), especially when there are wounds; physical damage, water evaporation may cause the rupture of epidermal cells (such as cherry fruit cracking), or cause the loss of fruit powder (such as the wax layer on the surface of blueberries), and reduce the fresh-keeping property; chemical changes, water can dissolve the natural protective substances (such as wax) on the surface of the peel, accelerate the oxidation discoloration (such as apple browning); storage obstacles: water-stained fruits are easy to frost when refrigerated, and the tissue is soft and rotten after thawing (such as litchi and longan).

[0005] 3. The cumulative effect: If fruit is both heated and moist at the same time, the damage will be exacerbated. High temperature and high humidity work together to promote microbial outbreaks, potentially causing widespread rotting within 24 hours. Tropical fruits (such as mangoes and durians) are particularly sensitive to this, and condensation during cold chain transportation can also cause problems.

[0006] As can be seen above, timely cold storage and preservation are essential to ensure the quality of fruit after harvesting. Therefore, the following functional requirements apply to the corresponding equipment used in orchard harvesting and transportation: 1. The device itself is portable and easy to use. Specifically, on the one hand, it should be easy to move to realize the transfer of fruit. On the other hand, since the number of fruits picked in actual operation is not constant, the structure used to hold the fruit needs to be space-variable to adapt to different numbers of fruits in a single task. 2. The device preserves fruit through refrigeration. Existing refrigeration technologies share common principles, but their designs often suffer from problems such as evaporator frosting and refrigerant recirculation stagnation. Evaporator frosting reduces refrigeration effectiveness, causing the device to lose its temperature control capabilities. Refrigerant recirculation stagnation reduces heat transfer efficiency, requiring increased power consumption to achieve the desired effect, thus increasing energy consumption. For portable refrigeration devices, energy efficiency is a crucial consideration, and maximizing usability is paramount. Summary of the Invention

[0007] In view of the problems existing in the prior art, the present invention provides a portable fruit preservation and transport device for orchards, the solution of which is as follows: A portable fruit preservation and transport device for orchards includes: Transport vehicle; The fruit compartment cover is installed on the transport vehicle. The fruit compartment cover includes a fixed wall frame at the rear end and a movable wall frame that can be extended and retracted back and forth. The fixed wall frame and the movable wall frame are covered with a cover cloth to form a closed space. The capacity of the fruit compartment cover can be changed by extending and retracting the movable wall frame back and forth. The space inside the fruit compartment cover is used to place the fruit to be processed. The fruit compartment cover is equipped with a preservation and refrigeration system and a ventilation system. The preservation and refrigeration system includes a first circulation loop and a secondary circulation loop. The first circulation loop includes a first compressor, a first condenser, a first throttling device, and a first evaporator, which are connected and circulated through a first circulation pipe. A first refrigerant is injected into the first circulation loop. The secondary circulation loop includes a refrigerant tank, a refrigeration pipe assembly, and a circulation pump, which are connected and circulated through a secondary circulation pipe. A secondary refrigerant is injected into the secondary circulation loop. The first evaporator is disposed inside the refrigerant tank. The air guiding system includes a fan and an air guiding pipe. The fan is located at the upper end of the air guiding pipe, and the air guiding pipe is fixedly installed on the fruit compartment cover. Several air holes are provided on the wall of the air guiding pipe. The refrigeration pipe assembly is arranged around the air duct.

[0008] In some preferred embodiments, a heating assembly is also included, which includes a heating device disposed on the secondary loop pipe to heat the secondary refrigerant flowing out of the refrigerant tank. The heating device includes a base tube and an electric heater, with both ends of the base tube connected to the secondary circuit tube, the electric heater being detachably connected to the base tube, and the heating element of the electric heater extending into the base tube; The inner diameter of the base tube is larger than the inner diameter of the secondary circuit tube. A flow retention sleeve is provided on the secondary circuit pipe at the liquid inlet end of the base pipe. The end of the flow retention sleeve is provided with a mesh plate structure to retain the secondary refrigerant through the mesh plate structure, so that it can be fully heated by the electric heater.

[0009] In some preferred embodiments, the first evaporator is a plate evaporator.

[0010] In some preferred embodiments, the movable wall frame is formed into a telescopic mechanism through a multi-section linkage to achieve overall front-to-back retraction, and the rear end and lower end of the movable wall frame are equipped with rollers to achieve sliding engagement.

[0011] In some preferred embodiments, the front end of the fruit compartment cover has a doorway for placing and removing fruit, and a curtain is provided on the doorway. The curtain is a sandwich structure, and a phase change material for heat storage is provided inside the sandwich structure.

[0012] In some preferred embodiments, the curtain is made of an aerogel film to achieve a heat insulation effect.

[0013] In some preferred embodiments, the curtain contains a bladder filled with a phase change material.

[0014] In some preferred embodiments, the refrigeration pipe assembly is divided into multiple independent pipe units, which are arranged sequentially from top to bottom along the air duct.

[0015] Beneficial effects: 1. This invention sets up a fruit compartment cover for refrigerated fruit on a transport vehicle for refrigeration and preservation of orchard fruit after harvesting. Since the transport vehicle can move freely under external force, it achieves portability of refrigeration, helps to refrigerate fruit in time after it is picked from the tree, and improves the level of fruit preservation. 2. The present invention constructs a preservation and refrigeration system by setting up a first circulation loop and a secondary circulation loop. In the two-stage circulation mode, the first refrigerant in the first circulation loop can avoid the increase in lubricating oil viscosity, wax precipitation and solidification caused by long-term exposure to low temperature environment, thereby avoiding the problems of poor fluidity, pipe blockage and damage to the first compressor. It can also avoid poor refrigeration effect caused by the first refrigerant not flowing smoothly. 3. Because the first evaporator is immersed in the secondary refrigerant, the present invention avoids the formation of frost on the first evaporator due to moisture in the air. The refrigeration effect of the entire refrigeration system is evenly distributed to the refrigeration coil assembly. The overall contact area between the refrigeration coil assembly and the outside air is large. Therefore, even if there is frost on the surface of the refrigeration coil assembly, it is very weak and will not affect the overall function. 4. The first circulation loop of this invention can be made sufficiently short. Therefore, a sufficiently short first circulation loop also avoids increased lubricant viscosity, wax precipitation, and solidification in the first circulation loop, thereby preventing the resulting decrease in fluidity, pipe blockage, and damage to the first compressor. This ensures the safe operation of the first circulation loop and avoids damage; at the same time, while meeting usage requirements and achieving the same cooling effect, energy consumption is lower. 5. The air guiding system blows air into the air duct through a fan. The flowing air is blown out through the air holes, and the cool air is blown towards the fruit placed in the fruit compartment cover, which improves the heat exchange efficiency and removes residual water on the surface of the fruit to avoid damage to the fruit. 6. The fruit compartment cover in this invention includes a foldable cover cloth and a retractable movable wall frame, which allows the internal space of the fruit compartment cover to be changed according to the actual amount of fruit it can hold. This improves the preservation efficiency when combined with refrigeration and preservation functions, and avoids the problem of wasting refrigeration resources due to the mismatch between the refrigeration capacity and the actual amount of fruit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure in one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the arrangement structure of the preservation and refrigeration system and the air guiding system in one embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the heating device in one embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of an electric heater in one embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the base tube in one embodiment of the present invention.

[0021] Figure 6This is a schematic diagram of the structure of the capsule in one embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the connection structure between the movable wall frame and the fixed wall frame in one embodiment of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments: refer to Figures 1-7 As shown, a portable fruit preservation and transport device for orchards includes a transport vehicle 100 and a fruit compartment cover 200. In some specific embodiments, the transport vehicle 100 is a motorcycle. In actual use, the fruit to be processed is placed inside the fruit compartment cover 200 and moved by the transport vehicle 100 as needed. The fruit compartment cover 200 is mounted on the transport vehicle 100.

[0024] refer to Figure 1 and 7 As shown, a fruit compartment cover 200 is installed on a transport vehicle 100. The fruit compartment cover 200 includes a fixed rear wall frame 210 and a movable wall frame 220 that can extend and retract forward and backward. The fixed wall frame 210 and the movable wall frame 220 are covered with a cover cloth 230 to form a closed space. The size of the fruit compartment cover 200 can be changed by extending and retracting the movable wall frame 220. The space inside the fruit compartment cover 200 is used to place fruits to be processed, and a preservation and refrigeration system 300 and a ventilation system 400 are installed inside the fruit compartment cover 200. In specific implementation, the movable wall frame 220, based on its structural characteristics, is a telescopic structure formed by a linkage mechanism. Therefore, the size of the fruit compartment cover 200 can be changed by extending it forward and backward. When more fruit needs to be placed, it is stretched towards the front of the vehicle by external force, thus increasing the space of the fruit compartment cover 200. When less fruit needs to be placed, it is stretched in the opposite direction of the front of the vehicle by external force, thus reducing the space of the fruit compartment cover 200.

[0025] refer to Figure 2 As shown, it also includes a preservation and refrigeration system 300 and an air guide system 400, and the preservation and refrigeration system 300 and the air guide system 400 are installed inside the fruit compartment cover 200.

[0026] refer to Figure 2As shown, the refrigeration system 300 includes a first circulation loop 310 and a secondary circulation loop 320. The first circulation loop 310 includes a first compressor 312, a first condenser 313, a first throttling device 314, and a first evaporator 315, which are connected and circulated through a first loop pipe 311. A first refrigerant is injected into the first circulation loop 310. The secondary circulation loop 320 includes a refrigerant tank 322, a refrigeration pipe assembly 323, and a circulation pump 324, which are connected and circulated through a secondary loop pipe 321. A secondary refrigerant is injected into the secondary circulation loop 320. The first evaporator 315 is disposed in the refrigerant tank 322.

[0027] When the first circulation loop 310 is working, the first compressor 312 draws in the low-temperature, low-pressure gaseous first refrigerant and compresses it to produce a high-temperature, high-pressure gas. The mechanical energy of the first compressor 312 is converted into the internal energy of the first refrigerant. The high-temperature, high-pressure gaseous first refrigerant flows through the first condenser 313, releasing heat to the outside and gradually condensing into a medium-temperature, high-pressure liquid. The first refrigerant changes from a gaseous state to a liquid state through heat release. The high-pressure liquid first refrigerant passes through the first throttling device 314, where the pressure drops sharply, and part of the liquid first refrigerant vaporizes, becoming low-temperature, low-pressure wet vapor, forming a vapor-liquid mixture. The low-temperature, low-pressure first refrigerant completely evaporates into a low-temperature, low-pressure gas in the first evaporator 315, absorbing heat from the external space to cool and refrigerate the secondary refrigerant in the refrigerant tank 322, thus generating heat exchange.

[0028] When the secondary circulation loop 320 is in operation, the circulation pump 324 drives the secondary refrigerant to flow along the secondary loop pipe 321 and enter the refrigeration pipe assembly 323. Since the refrigeration pipe assembly 323 is located inside the fruit compartment cover 200, the refrigeration pipe assembly 323 cools the inside of the fruit compartment cover 200.

[0029] In the above-described scheme of the freezing and preservation device of the present invention, since the first evaporator 315, which directly generates a cooling effect on the outside, is located in the refrigerant tank 322 and is submerged in the secondary refrigerant, which is in a circulating state, the first refrigerant in the first circulation loop can avoid the increase in lubricating oil viscosity, wax precipitation, and solidification caused by prolonged exposure to a low-temperature environment. This avoids the resulting problems of poor flowability, pipe blockage, and damage to the first compressor. This effect and function are important for the stability and effectiveness of the refrigeration and preservation function within the fruit compartment cover 200, preventing poor refrigeration performance due to the inability of the first refrigerant to flow smoothly.

[0030] In the above solution, since the first evaporator 315, which directly generates frost, is immersed in the secondary refrigerant, and the secondary refrigerant flows in the secondary circulation loop 320, it avoids the formation of frost on the first evaporator 315 due to moisture in the air. This also avoids the problems of incomplete defrosting and wear associated with existing dedicated defrosting designs, such as mechanical defrosting brushes. Theoretically, frost may form on the surface of the refrigeration coil assembly 323 in the above solution. However, because the cooling effect of the entire refrigeration system is evenly distributed on the refrigeration coil assembly 323, and the overall contact area between the refrigeration coil assembly 323 and the outside air is large, even if frost forms on its surface, it will be very slight and will not affect the overall function. Frosting of direct cooling components is a common problem in this field; therefore, this design solves the problem of easy frost formation.

[0031] In the above scheme, the overall refrigeration design is used to cool and refrigerate the interior of the fruit compartment cover 200. Since the fruit compartment cover 200 has a large space, the existing single-cycle design inevitably results in an excessively long refrigerant circulation path for cooling. The above scheme employs a two-stage circulation structure with a first circulation loop 310 and a secondary circulation loop 320. Therefore, it is easy to see that the first circulation loop 310 can be made sufficiently short. A sufficiently short first circulation loop 310 also avoids increased lubricant viscosity, wax precipitation, and solidification in the first circulation loop 310, thereby preventing problems such as decreased fluidity, pipe blockage, and damage to the first compressor 312. This ensures the safe operation of the first circulation loop 310 and prevents damage.

[0032] In the above solution, the increased viscosity, wax precipitation, and solidification of the lubricating oil in the first circulation loop 310 are solved at the root, thereby avoiding the problems of decreased fluidity, blocked pipelines, and damage to the first compressor 312. Therefore, compared with the existing technology in the industry, it also avoids the need to design an additional oil heater for lubricating oil treatment, making the technical concept of the solution more energy-efficient, indirect, and stable.

[0033] In the above scheme, theoretically and qualitatively, the lubricating oil in the first circulation loop 310 has the problem of solidification. However, due to the scheme design and actual use, the length of the first circulation loop 310 can be short enough, and the entire first circulation loop, especially the first evaporator 315, is avoided from being exposed to the freezing space for a long time. This avoids the functional defects and inconvenience of the refrigeration system caused by the large increase in viscosity, wax precipitation and solidification of the lubricating oil in the first circulation loop 310.

[0034] In the above-described scheme of the freezing and preservation device of the present invention, the fruit compartment cover 200 is cooled through the secondary circulation loop 320. Compared with the design of using a single refrigerant circulation loop (e.g., only using the first circulation loop 310), to achieve the effect of uniformly arranging the refrigeration components (e.g., the first evaporator 315 and the same functional components) within the fruit compartment cover 200, the corresponding pipeline is very long. Furthermore, in a longer circulation loop, the refrigerant will experience problems such as high flow resistance, reduced flow velocity, difficulty in recirculation, and reduced cooling effect. To meet the overall cooling effect in the fruit compartment cover 200, higher energy consumption is required. Therefore, by setting the secondary circulation loop 320 in this scheme, the overall circulation length of the first circulation loop 310 (where the first refrigerant is generally a material with a certain viscosity, such as Freon) can be reduced, avoiding the defects existing in the prior art. This ensures smooth flow of the first refrigerant in the first circulation loop 310, resulting in lower energy consumption while achieving the same cooling effect.

[0035] In the above scheme, two-stage refrigeration is achieved through the first circulation loop 310 and the secondary circulation loop 320. Specifically, the refrigeration pipe assembly 323 generates the cooling effect within the fruit compartment cover 200. In practice, the refrigeration pipe assembly 323 is divided into multiple refrigeration units, evenly arranged within the fruit compartment cover 200. The refrigeration of the first circulation loop 310 is concentrated at the first evaporator 315. The refrigeration generated by the first circulation loop 310 is directly converted to the secondary refrigerant through the first evaporator 315. The secondary refrigerant circulates within the refrigeration units, completing the cooling of the fruit compartment cover 200. Therefore, achieving the desired effect within the fruit compartment cover 200, due to the circulation of the secondary refrigerant, avoids refrigerant stagnation, and the even arrangement of the refrigeration units, requires lower energy consumption compared to existing technologies to meet the cooling needs within the fruit compartment cover 200.

[0036] refer to Figure 2 As shown, the air guiding system 400 includes a fan 410 and an air guiding duct 420. The fan 410 is located at the upper end of the air guiding duct 420, and the air guiding duct 420 is fixedly installed on the fruit compartment cover 200. Several air holes 421 are provided on the wall of the air guiding duct 420. The refrigeration pipe assembly 323 is arranged around the air guiding duct 420.

[0037] In the specific implementation process, refer to Figure 2 As shown, when the fan 410 is started, it blows air into the air duct 420, generating airflow. The airflow passes through the air duct 420 and is blown outward from the air hole 421 on the air duct 420, blowing the cold air near the cooling coil assembly 323 towards the fruit that needs to be cooled, thereby achieving cooling and preventing damage to the fruit.

[0038] In some preferred embodiments, reference Figures 2-5As shown, the system also includes a heating assembly 500, which includes a heating device 510 disposed on the secondary circuit pipe 321 to heat the secondary refrigerant flowing out of the refrigerant tank 322. The heating device 510 includes a base pipe 511 and a heater 512. Both ends of the base pipe 511 are connected to the secondary circuit pipe 321, and the heater 512 is detachably connected to the base pipe 511, with its heating element extending into the base pipe 511. The inner diameter of the base pipe 511 is larger than the inner diameter of the secondary circuit pipe 321. A flow-retarding sleeve 3211 is provided on the secondary circuit pipe 321 at the liquid inlet end of the base pipe 511. A mesh structure is provided at the end of the flow-retarding sleeve 3211 to retain the secondary refrigerant, allowing it to be sufficiently heated by the heater 512.

[0039] Heating device 510 is used to heat the secondary refrigerant, enabling precise temperature control of the secondary refrigerant used for refrigeration, regulating the thermal energy of the secondary refrigerant, and adjusting the heat exchange effect in the circulation, thereby making its control over the product's preservation effect more precise. The start-up of heating device 510 and the intensity of heating are controllable. Electric heater 512 extends into the secondary circuit pipe 321 through a threaded through-hole to heat the secondary refrigerant, and the electric heater 512 itself has a threaded structure, which, together with the threaded through-hole, creates a stable and sealed connection. The retaining sleeve 3211 is equipped with a mesh plate structure, which slows down the flow of the secondary refrigerant, thereby improving the heating effect.

[0040] The power supply module and circuit control module used to control the heating function in the heating component 500 are existing technologies and will not be described in detail here.

[0041] In some preferred embodiments, the first evaporator 315 is a plate evaporator. Plate evaporators have better heat exchange efficiency.

[0042] In some preferred embodiments, reference Figure 1 and 7 As shown, the movable wall frame 220 is formed into a telescopic mechanism through a multi-section linkage mechanism to achieve overall front and rear retraction. The rear end and lower end of the movable wall frame 220 are equipped with rollers to achieve sliding engagement.

[0043] In some preferred embodiments, reference Figure 1 As shown, the front end of the fruit compartment cover 200 has a doorway for putting in and taking out fruit. A curtain 240 is provided on the doorway. The curtain 240 has a sandwich structure and a phase change material for heat storage is provided inside the sandwich structure.

[0044] In some preferred embodiments, reference Figure 6As shown, a bladder 241 is provided inside the curtain 240, and the bladder 241 is filled with a phase change material. The bladder 241 is used to fill the phase change material to make the insertion of the phase change material more convenient. The curtain 220 is made of textile fibers as a soft material.

[0045] In some preferred embodiments, the cooling coil assembly 323 is divided into multiple independent coil units, which are arranged sequentially from top to bottom along the air duct 420. This achieves more precise cooling control.

[0046] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A portable fruit preservation and transport device for orchards, characterized in that, include: Transport vehicle (100); Fruit compartment cover (200), the fruit compartment cover (200) is installed on the transport vehicle (100), the fruit compartment cover (200) includes a fixed wall frame (210) at the rear end and a movable wall frame (220) that can be extended and retracted back and forth, the fixed wall frame (210) and the movable wall frame (220) are covered with a cover cloth (230) for forming a closed space, and the capacity of the fruit compartment cover (200) can be changed by extending and retracting the movable wall frame (220). The space inside the fruit compartment cover (200) is used to place the fruit to be processed, and the fruit compartment cover (200) is equipped with a preservation and refrigeration system (300) and a ventilation system (400). The preservation and refrigeration system (300) includes a first circulation loop (310) and a secondary circulation loop (320). The first circulation loop (310) includes a first compressor (312), a first condenser (313), a first throttling device (314), and a first evaporator (315) connected and circulated through a first circulation pipe (311). A first refrigerant is injected into the first circulation loop (310). The secondary circulation loop (320) includes a refrigerant tank (322), a refrigeration pipe assembly (323), and a circulation pump (324) connected and circulated through a secondary circulation pipe (321). A secondary refrigerant is injected into the secondary circulation loop (320). The first evaporator (315) is located inside the refrigerant tank (322). The air guiding system (400) includes a fan (410) and an air guiding pipe (420). The fan (410) is located at the upper end of the air guiding pipe (420), and the air guiding pipe (420) is fixedly installed outside the fruit compartment cover (200). A plurality of air holes (421) are provided on the pipe wall of the air guiding pipe (420). The refrigeration pipe assembly (323) is arranged around the air duct (420).

2. The portable fruit preservation and transport device for orchards as described in claim 1, characterized in that: It also includes a heating assembly (500), which includes a heating device (510) and is disposed on the secondary loop pipe (321) to heat the secondary refrigerant flowing out from the refrigerant tank (322); The heating device (510) includes a base tube (511) and an electric heater (512), and both ends of the base tube (511) are connected to the secondary circuit tube (321). The electric heater (512) is detachably connected to the base tube (511), and the heating part of the electric heater (512) extends into the base tube (511). The inner diameter of the base tube (511) is larger than the inner diameter of the secondary circuit tube (321); A flow retention sleeve (3211) is provided on the secondary circuit pipe (321) at the liquid inlet end of the base pipe (511). The end of the flow retention sleeve (3211) is provided with a mesh plate structure so that the secondary refrigerant can be retained through the mesh plate structure and thus be fully heated by the electric heater (512).

3. The portable fruit preservation and transport device for orchards as described in claim 1, characterized in that: The first evaporator (315) is a plate evaporator.

4. The portable fruit preservation and transport device for orchards as described in claim 1, characterized in that: The movable wall frame (220) is formed into a telescopic mechanism through a multi-section linkage mechanism to achieve overall front and rear retraction. The rear end and lower end of the movable wall frame (220) are equipped with rollers to achieve sliding cooperation.

5. The portable fruit preservation and transport device for orchards as described in claim 1, characterized in that: The front end of the fruit compartment cover (200) has a doorway for putting in and taking out fruit. A curtain (240) is provided on the doorway. The curtain (240) has a sandwich structure and a phase change material for heat storage is provided inside the sandwich structure.

6. The portable fruit preservation and transport device for orchards as described in claim 5, characterized in that: The curtain (240) is provided with a bladder (241), and the bladder (241) is filled with a phase change material.

7. The portable fruit preservation and transport device for orchards as described in claim 1, characterized in that: The refrigeration pipe assembly (323) is divided into multiple independent pipe units (3231), which are arranged sequentially from top to bottom along the air duct (420).

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