An interior heat insulation structure for a new energy refrigerated vehicle compartment

Abstract

The application relates to the technical field of refrigerated trucks, and discloses an internal heat insulation structure for a new energy refrigerated truck compartment, which comprises a bottom plate, side plates one, two, three and four are respectively arranged on the top of the four peripheral edges of the bottom plate, a top plate is arranged on the top of the side plates one, two, three and four, the adjacent plates of the bottom plate, the side plates one, two, three and four and the top plate are closed and connected through sealing connecting pieces, and the bottom plate, the side plates one, two, three and four and the top plate jointly form a closed compartment body. Through the synergistic effect of the uniform-temperature heat exchange air pipe assembly and the metal support, the local cold spot defect is eliminated, frosting of the ventilation outer pipe is prevented, the heat insulation performance and the frost prevention capability of the compartment body are remarkably improved, meanwhile, the arc-shaped distribution layout of the air outlet pipe strengthens the cold air supply at the top and the bottom of the compartment body, effectively offsets the heat dissipation of the compartment body, forms a uniform temperature field, and improves the refrigeration quality of goods.

Description

Technical Field

[0001] This invention relates to the field of refrigerated vehicle technology, specifically to an internal heat insulation structure for new energy refrigerated truck compartments. Background Technology

[0002] In patent application CN110979479A, a base plate, a top plate, and two sets of side plates are included. Both the base plate and top plate are made of a composite of metal panels and high-strength phenolic plywood. The side plates include an aluminum edging, an insulation layer, a sealing plate, and a fiberglass plate. The insulation layer and sealing plate are located inside the aluminum edging. A fiberglass plate is fixed to one side of the aluminum edging with screws. The sealing plate has a cavity inside, and multiple partitions along the height of the sealing plate are fixed within the cavity, dividing the cavity into multiple independent vacuum chambers. An air pipe is located on the upper part of each vacuum chamber, away from the fiberglass plate. The advantages are: overcoming the shortcomings of existing technologies; the vacuum chambers improve the thermal insulation performance of the refrigerated truck compartment and facilitate the detection of cracks; and by increasing the strength of the side plates and insulation layer, impact deformation causing insulation layer breakage is avoided.

[0003] In the prior art, including the aforementioned patents, the side panels of existing refrigerated truck compartments typically employ a composite sandwich panel structure. While the embedded metal frame (skeleton) enhances the structural strength of the compartment, the high thermal conductivity of metal materials easily creates a "thermal bridge" effect. During refrigeration operation, the cold air inside the compartment dissipates outward through the metal frame, causing the temperature of the inner wall in that area to be significantly higher than other parts, resulting in localized "cold spot deficiencies." This localized high temperature causes goods stored near this area to deteriorate more quickly due to the higher temperature. Simultaneously, condensation occurs on the inner wall surface due to the temperature difference, and in severe cases, frost may form, affecting the cleanliness and refrigeration efficiency of the compartment. Furthermore, the ventilation ducts used to transport cold air in existing refrigerated truck compartments are typically directly exposed to the low-temperature environment. The pipe surface temperature is extremely low, making it easy for frost to accumulate. As the operating time increases, the frost on the pipe wall gradually thickens, which not only hinders the delivery of cold air and reduces heat exchange efficiency, but also requires frequent shutdowns for defrosting, increasing energy consumption and affecting the continuity of cold chain transportation and the safety of goods. In addition, the existing air supply methods of refrigerated trucks are relatively simple, usually with air outlets only set in the top or middle of the side wall of the truck. Due to the high density of cold air and its tendency to sink, the cooling capacity in the top area of ​​the truck is insufficient, while the bottom area is too cold. The cooling capacity is unevenly distributed on the sides of the truck and in the middle of the stacked goods, making it difficult to form a uniform temperature field. This uneven temperature distribution will cause large temperature fluctuations in some goods, affecting the refrigerated quality. Especially for temperature-sensitive fresh foods, it can easily cause local overheating or freezing damage, shortening the shelf life.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The problems to be solved by the present invention are: the existing refrigerated compartment suffers from lack of local cold spots due to heat conduction of metal brackets, easy frost formation on ventilation ducts, and uneven temperature distribution inside the compartment.

[0006] To solve the above technical problems, the technical solution of the present invention is: an internal heat insulation structure for a new energy refrigerated compartment, comprising a bottom plate, the top of the four peripheral edges of the bottom plate are respectively installed with a first side plate, a second side plate, a third side plate and a fourth side plate, the tops of the first side plate, the second side plate, the third side plate and the fourth side plate are installed with a top plate, the adjacent plates among the bottom plate, the first side plate, the second side plate, the third side plate, the fourth side plate and the top plate are hermetically connected through sealing connectors to jointly form a closed compartment body, a compartment door is installed at the rectangular hole of the fourth side plate, a condenser is installed on the outer top side of the third side plate, an evaporator is installed on the inner top side of the third side plate, and a uniform-temperature heat exchange air duct assembly is arranged inside the compartment body; The uniform-temperature heat exchange air duct assembly comprises a "日"-shaped outer ventilation pipe and a "日"-shaped inner ventilation pipe, the "日"-shaped inner ventilation pipe is arranged in the middle of the hollow part of the "日"-shaped outer ventilation pipe, a plurality of air outlet pipes are communicated and arranged on one side of the vertical part of the "日"-shaped inner ventilation pipe, and the air outlet pipes are fixedly penetrated through the "日"-shaped inner ventilation pipe; An air distribution box is installed at the air outlet of the evaporator, and both sides of the air distribution box are communicated with one side of the top of the "日"-shaped inner ventilation pipe on the corresponding side through connecting assemblies.

[0007] Preferably, each of the first side plate, the second side plate and the third side plate is of a composite sandwich plate structure, which respectively comprises an outer sealing plate, a metal bracket, a heat insulation plate and an inner sealing plate, the outer sealing plate, the metal bracket, the heat insulation plate and the inner sealing plate are sequentially bonded and fixed by an adhesive, and the "日"-shaped outer ventilation pipe is attached to the side of the metal bracket facing the interior of the compartment.

[0008] Preferably, small axial flow fans are installed inside both sides of the air distribution box.

[0009] Preferably, the connecting assembly comprises a connecting cover and a connecting pipe, one end of the connecting cover is fixedly connected with one end of the air distribution box, the other end of the connecting cover is fixedly connected with one end of the connecting pipe, and the other end of the connecting pipe fixedly penetrates through one side of the top of the "日"-shaped outer ventilation pipe on the corresponding side and is communicated with the "日"-shaped inner ventilation pipe.

[0010] Preferably, the included angle between the axis of each of the plurality of air outlet pipes and the horizontal plane gradually decreases from top to bottom, the axis of the upper air outlet pipes is inclined upward, and the axis of the lower air outlet pipes is inclined downward, so that the outlet ends of all the air outlet pipes are arranged in an arc shape in space.

[0011] Preferably, a heat-insulating buffer material is filled between the "日"-shaped outer ventilation pipe and the "日"-shaped inner ventilation pipe, so as to prevent cold energy from dissipating outward and homogenize the temperature of the cold air conveyed inside the "日"-shaped inner ventilation pipe.

[0012] Preferably, a ventilation plate is fixedly connected to the top of the bottom plate, the ventilation plate is rectangular, matches the outline of the top of the bottom plate, and a ventilation area for guiding airflow to pass through is formed on the plate surface of the ventilation plate.

[0013] Preferably, the outer sealing plate is a glass fiber reinforced plastic plate, the inner sealing plate is an aluminum alloy plate, a stainless steel plate or a glass fiber reinforced plastic plate, and the heat insulation plate is high-density rigid polyurethane foam or aerogel felt.

[0014] Preferably, the sealing connecting member is a broken bridge heat-insulating profile, two sides of the sealing connecting member are respectively clamped or screwed with the edges of the adjacent plates, and a sealant is filled at the joint.

[0015] Preferably, the "日"-shaped outer ventilation pipe is a glass fiber reinforced plastic pipe or a rigid polyurethane pipe, and the "日"-shaped inner ventilation pipe is an aluminum alloy pipe.

[0016] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) Through the synergistic effect of the temperature-uniforming air duct assembly and the metal bracket, the present invention eliminates the lack of local cold spots while preventing frosting on the outer ventilation pipe, significantly improving the heat insulation performance and anti-frost capability of the carriage body. Meanwhile, through the arc-shaped distribution layout of the air outlet pipes, enhanced cold supply is performed to the top and bottom of the carriage body, which effectively counteracts the heat dissipation of the carriage body, forms a uniform temperature field, and improves the refrigerated quality of goods. The "日"-shaped outer ventilation pipe is closely attached to the side of the metal bracket in the side plate composite sandwich plate structure facing the interior of the carriage. During refrigeration operation, low-temperature cold air is continuously conveyed in the "日"-shaped inner ventilation pipe, which makes the surface temperature of the outer pipe drop sharply. If operated alone, there is a high risk of frosting. However, due to its high thermal conductivity, the metal bracket will transfer the heat from the outside of the carriage body to the inside, resulting in a locally high temperature on the inner wall of the carriage body in this area, forming a "lack of cold spots", which easily causes nearby goods to deteriorate and condensate water to form on the inner wall. When the low-temperature surface of the outer ventilation pipe is in contact with the high-temperature area of the metal bracket, thermal neutralization occurs between the two: on the one hand, the cold energy of the outer pipe compensates for the heat loss at the metal bracket, making the temperature of the inner wall of the carriage body in this area tend to be consistent with other parts of the carriage body, avoiding goods deterioration and inner wall water formation caused by local high temperature; on the other hand, an appropriate amount of heat transferred by the metal bracket just raises the surface temperature of the outer ventilation pipe above the dew point, fundamentally eliminating the frosting phenomenon. This synergistic design makes the temperature distribution of the inner wall of the carriage body uniform, no additional defrosting energy consumption is required, and the anti-frost capability of the heat insulation structure and the operation efficiency of the refrigeration system are significantly improved; (2) By arranging a plurality of air outlet pipes, the included angle between the axis of each of the plurality of air outlet pipes and the horizontal plane gradually decreases from top to bottom, the axis of the upper air outlet pipe is inclined upward, and the axis of the lower air outlet pipe is inclined downward, so that the outlet ends of the respective air outlet pipes are arranged in an arc shape in space. During refrigeration operation, cold air enters each air outlet pipe through the vertical pipe of the "日"-shaped inner ventilation pipe, the upwardly inclined air outlet pipes deliver more cooling capacity to the top of the carriage, and the downwardly inclined air outlet pipes deliver more cooling capacity to the bottom of the carriage, thereby precisely offsetting the extra heat dissipation generated at the top and bottom of the carriage body due to the large temperature difference with the external environment. At the same time, the cold air is ejected from both sides of the carriage to the middle space, and cooperates with the ventilation plate arranged on the bottom plate to form a uniform convection circulation inside the carriage body, which effectively avoids the problems of excessively high temperatures at the top and bottom and uneven temperature in the cargo stacking area in the traditional refrigerated carriage, makes the temperature field of the entire carriage space more uniform and stable, and significantly improves the refrigeration quality and storage period of the goods. Brief Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall front side structure of the present invention; Figure 2 is a schematic diagram of the overall rear side structure of the present invention; Figure 3 is a schematic structural diagram of the ventilation plate of the present invention; Figure 4 is a schematic structural diagram of the air distribution box of the present invention; Figure 5 is a schematic structural diagram of the sealing connecting member of the present invention; Figure 6 is a schematic diagram of the overall exploded structure of the present invention; Figure 7 is a schematic structural diagram of each component of the first side plate of the present invention; Figure 8 is a schematic cross-sectional structural diagram of the uniform-temperature heat exchange air duct assembly of the present invention; Figure 9 of the present invention Figure 8 is an enlarged schematic structural view of part A in the drawing; Figure 10 is a schematic structural diagram of the small axial flow fan of the present invention; Figure 11 is a schematic cross-sectional structural diagram of the air distribution box of the present invention; Figure 12 is a schematic top cross-sectional structural diagram of the connecting pipe of the present invention; Figure 13 is a schematic cross-sectional structural diagram of the "日"-shaped outer ventilation pipe and the "日"-shaped inner ventilation pipe of the present invention; Figure 14 is a schematic side plane structural diagram of the air outlet pipe of the present invention.

[0018] In the figures: 1. Base plate; 101. First side plate; 1011. Outer sealing plate; 1012. Metal bracket; 1013. Heat insulation plate; 1014. Inner sealing plate; 102. Second side plate; 103. Third side plate; 104. Fourth side plate; 105. Top plate; 106. Compartment door; 2. Ventilation plate; 3. Condenser; 301. Evaporator; 4. Sealing connecting member; 5. "日"-shaped outer ventilation pipe; 501. "日"-shaped inner ventilation pipe; 504. Air outlet pipe; 6. Air distribution box; 601. Small axial flow fan; 602. Connection cover; 603. Connection pipe. Detailed Description of the Embodiments

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

[0020] Unless otherwise defined, all technical or scientific terms used in the present disclosure shall have the usual meanings understood by those with ordinary skills in the field to which the present disclosure belongs. Terms such as "comprising" or "including" used in the present disclosure mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, and may also include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object is changed, the relative positional relationship may also change correspondingly.

[0021] As Figures 1 to 14 shown, the present invention provides an internal heat insulation structure for a new energy refrigerated compartment, comprising a base plate 1. A first side plate 101, a second side plate 102, a third side plate 103 and a fourth side plate 104 are respectively mounted on the top of the peripheral edge of the base plate 1. A top plate 105 is mounted on the tops of the first side plate 101, the second side plate 102, the third side plate 103 and the fourth side plate 104. Adjacent plates among the base plate 1, the first side plate 101, the second side plate 102, the third side plate 103, the fourth side plate 104 and the top plate 105 are hermetically connected by sealing connecting members 4 to jointly form a closed compartment body. A compartment door 106 is mounted at the rectangular opening of the fourth side plate 104. A condenser 3 is mounted on the outer top side of the third side plate 103, an evaporator 301 is mounted on the inner top side of the third side plate 103, and a uniform-temperature heat exchange air duct assembly is arranged inside the compartment body The uniform-temperature heat exchange air duct assembly comprises a "日"-shaped outer ventilation pipe 5 and a "日"-shaped inner ventilation pipe 501. The "日"-shaped inner ventilation pipe 501 is disposed in the middle of the hollow part of the "日"-shaped outer ventilation pipe 5. A plurality of air outlet pipes 504 are arranged in communication on one side of the vertical portion of the "日"-shaped inner ventilation pipe 501, and the air outlet pipes 504 are fixedly arranged to penetrate through the "日"-shaped inner ventilation pipe 501; An air distribution box 6 is installed at the air outlet of the evaporator 301, and both sides of the air distribution box 6 are in communication with one side of the top of the "日"-shaped inner ventilation pipe 501 on the corresponding side via connecting assemblies.

[0022] As an embodiment of the present invention, the first side plate 101, the second side plate 102 and the third side plate 103 are all of a composite sandwich plate structure, each comprising an outer sealing plate 1011, a metal bracket 1012, a heat insulation plate 1013 and an inner sealing plate 1014. The outer sealing plate 1011, the metal bracket 1012, the heat insulation plate 1013 and the inner sealing plate 1014 are sequentially bonded and fixed to one another by an adhesive. The "日"-shaped outer ventilation pipe 5 is attached to the side of the metal bracket 1012 facing the interior of the carriage. The metal bracket 1012 is used to enhance the structural strength of the carriage body, but due to its relatively high thermal conductivity, it easily transfers the cold inside the carriage body outward, resulting in a locally elevated temperature at this location, forming a "cold spot loss", which leads to easy deterioration of nearby goods, and generation of condensed water or even frost on the inner wall. The uniform-temperature heat exchange air duct assembly directly performs temperature compensation on this area by being attached to the metal bracket 1012.

[0023] As an embodiment of the present invention, small axial flow fans 601 are installed inside both sides of the air distribution box 6, for forcibly blowing the cold air generated by the evaporator 301 into the "日"-shaped inner ventilation pipes 501 on both sides, ensuring that the cold air can be quickly delivered to the rear of the carriage, so that the entire carriage is cooled synchronously.

[0024] As an embodiment of the present invention, the connecting assembly comprises a connecting cover 602 and a connecting pipe 603. One end of the connecting cover 602 is fixedly connected to one end of the air distribution box 6, the other end of the connecting cover 602 is fixedly connected to one end of the connecting pipe 603, and the other end of the connecting pipe 603 is fixedly arranged to penetrate through one side of the top of the "日"-shaped outer ventilation pipe 5 on the corresponding side and is in communication with the "日"-shaped inner ventilation pipe 501. Cold air flows from the air distribution box 6 through the connecting cover 602 and the connecting pipe 603 into the transverse pipe of the "日"-shaped inner ventilation pipe 501.

[0025] As an embodiment of the present invention, the included angles between the axes of the plurality of air outlet pipes 504 and the horizontal plane gradually decrease from top to bottom, the axes of the upper air outlet pipes 504 are inclined upward, and the axes of the lower air outlet pipes 504 are inclined downward, so that the outlet ends of all the air outlet pipes 504 are arranged in an arc shape in space. This arc-shaped arrangement design can deliver more cooling capacity to the top top plate 105 and the bottom bottom plate 1 area to offset the additional heat dissipation generated at the top and bottom of the compartment body due to the large temperature difference with the external environment, and meanwhile make cold air spray from both sides of the carriage to the middle space to form a uniform air distribution.

[0026] As an embodiment of the present invention, a heat-insulating buffer material is filled between the "日"-shaped outer ventilation pipe 5 and the "日"-shaped inner ventilation pipe 501, so as to prevent the cooling capacity conveyed inside the "日"-shaped inner ventilation pipe 501 from dissipating outward, homogenize the temperature of the cold air conveyed inside the "日"-shaped inner ventilation pipe 501, and ensure that the temperature of the cold air entering each air outlet pipe 504 is consistent.

[0027] As an embodiment of the present invention, the top of the bottom plate 1 is fixedly connected with a ventilation plate 2, the ventilation plate 2 is rectangular and matches the outline of the top of the bottom plate 1, and a ventilation area for guiding air flow to pass through is formed on the plate surface of the ventilation plate 2, which facilitates the cold air circulation at the bottom of the compartment body.

[0028] As an embodiment of the present invention, the outer sealing plate 1011 is a glass fiber reinforced plastic plate, which has good corrosion resistance and impact resistance; the inner sealing plate 1014 is an aluminum alloy plate, a stainless steel plate or a glass fiber reinforced plastic plate, which is easy to clean and has moderate thermal conductivity; the heat insulation plate 1013 is made of high-density rigid polyurethane foam or aerogel felt, which provides excellent heat insulation performance.

[0029] As an embodiment of the present invention, the sealing connecting piece 4 is a broken-bridge heat-insulating profile, two sides of the sealing connecting piece 4 are respectively clamped or screwed with the edges of adjacent plates, and sealant is filled at the joint, which effectively blocks the thermal bridge effect at the joint between the plates.

[0030] As an embodiment of the present invention, the "日"-shaped outer ventilation pipe 5 is a glass fiber reinforced plastic pipe or a rigid polyurethane pipe, which has both strength and heat insulation performance, and the "日"-shaped inner ventilation pipe 501 is an aluminum alloy pipe, which has good thermal conductivity and is convenient for quickly transferring the cooling capacity to the far end of the "日"-shaped inner ventilation pipe 501.

[0031] The working principle and use process of the present invention: Initial state: The refrigeration unit is started, the condenser 3 and the evaporator 301 start to work, and the evaporator 301 generates cold air. At this time, the interior of the compartment forms preliminary heat insulation through the composite sandwich panel structure and the sealing connecting member 4. However, due to the heat conduction effect of the metal bracket 1012, the inner wall area of the compartment at the corresponding position is prone to locally high temperature (i.e., "cooling capacity deficiency"). Without intervention, the goods stored near this area are prone to deterioration, and the inner wall of the compartment may generate condensed water or even frost; Cold air delivery and temperature equalization process: The cold air generated by the evaporator 301 enters the air distribution box 6, the small axial flow fans 601 inside both sides of the air distribution box 6 are started to force the cold air into the connection cover 602 and the connection pipe 603. The cold air passes through the connection pipe 603 and enters the transverse pipes of the "日"-shaped inner ventilation pipes 501 on both sides. Since the transverse pipes penetrate the compartment in the front-rear direction, the cold air is rapidly blown to the rear side of the compartment under the pressure of the small axial flow fans 601. After the cold air enters the transverse pipes of the "日"-shaped inner ventilation pipes 501, under the action of the self-gravity of the cold air sinking, the cold air simultaneously enters each vertical pipe downward. A plurality of air outlet pipes 504 are communicated with one side of each vertical pipe, and the cold air is sprayed outward through the air outlet pipes 504. Since the included angle between the axis of the air outlet pipes 504 and the horizontal plane gradually decreases from top to bottom, the upper air outlet pipes 504 are inclined upward to blow the cold air toward the top plate 105; the lower air outlet pipes 504 are inclined downward to blow the cold air toward the bottom plate 1; the middle air outlet pipes 504 are approximately horizontal, so the cold air is sprayed toward the middle space on both sides of the compartment, and the air output at the top and bottom is larger, which effectively offsets the heat load formed by more heat dissipation at the top and bottom of the compartment; Meanwhile, the "日"-shaped outer ventilation pipe 5 is closely attached to the side of the metal bracket 1012 facing the interior of the compartment. Since the low-temperature cold air is delivered in the "日"-shaped inner ventilation pipe 501, its cooling capacity is transferred to the "日"-shaped outer ventilation pipe 5 through the heat insulation buffer material, so that the surface temperature of the "日"-shaped outer ventilation pipe 5 is significantly reduced. This low-temperature surface is in direct contact with the local high-temperature area generated by the metal bracket 1012, and the heat energy dissipated due to the heat conduction of the metal bracket is neutralized through heat exchange, so that the temperature of the inner wall of the compartment at this position tends to be consistent with other parts of the compartment, thereby eliminating the "cooling capacity deficiency" phenomenon; Uniform temperature and anti-frost effect: Since the "日"-shaped ventilation outer pipe 5 continuously provides cold energy compensation, no local high temperature occurs at the position corresponding to the metal bracket 1012, the temperature distribution at all positions on the inner wall of the compartment is uniform, and the problems of condensate accumulation and frosting caused by temperature difference are avoided. At the same time, the cold air sprayed from the air outlet pipe 504 forms a uniform convection circulation in the carriage, which cooperates with the ventilation plate 2 to make the temperature field of the entire compartment space more uniform, and the cargo storage environment is significantly improved. Moreover, the continuously flowing low-temperature cold air inside the "日"-shaped ventilation outer pipe 5 will make the surface temperature of the outer pipe extremely low, which is very prone to frosting risk if operated alone. However, the metal bracket will transfer the heat outside the compartment at this position to the inside due to heat conduction, forming a local high temperature (i.e., a cold energy missing area). When the low-temperature surface of the outer pipe is in contact with the high-temperature area of the metal bracket, thermal neutralization occurs between the two, so as to avoid frosting.

[0032] The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent replacements shall also be regarded as falling within the protection scope of the present invention.

Claims

1. An internal heat insulation structure for a new energy refrigerated truck compartment, comprising a floor plate (1), characterized in that: The top of the peripheral edges of the bottom plate (1) are respectively mounted with a first side plate (101), a second side plate (102), a third side plate (103) and a fourth side plate (104). The tops of the first side plate (101), second side plate (102), third side plate (103) and fourth side plate (104) are mounted with a top plate (105). Adjacent plates among the bottom plate (1), first side plate (101), second side plate (102), third side plate (103), fourth side plate (104) and top plate (105) are hermetically connected by sealing connecting members (4) to jointly form a closed carriage body. A box door (106) is mounted at the rectangular hole of the fourth side plate (104). A condenser (3) is mounted on the outer top side of the third side plate (103), an evaporator (301) is mounted on the inner top side of the third side plate (103), and a uniform-temperature heat exchange air duct assembly is arranged inside the carriage body; The uniform-temperature heat exchange air duct assembly comprises a "day"-shaped outer ventilation pipe (5) and a "day"-shaped inner ventilation pipe (501). The "day"-shaped inner ventilation pipe (501) is arranged in the middle of the hollow part of the "day"-shaped outer ventilation pipe (5). A plurality of air outlet pipes (504) are arranged in communication on one side of the vertical portion of the "day"-shaped inner ventilation pipe (501), and the air outlet pipes (504) are fixedly penetrated through the "day"-shaped inner ventilation pipe (501); An air distribution box (6) is mounted at the air outlet of the evaporator (301), and both sides of the air distribution box (6) are in communication with one side of the top of the "day"-shaped inner ventilation pipe (501) on the corresponding side through connecting assemblies.

2. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: The first side plate (101), the second side plate (102) and the third side plate (103) all have a composite sandwich plate structure, each comprising an outer sealing plate (1011), a metal bracket (1012), a heat insulation plate (1013) and an inner sealing plate (1014). The outer sealing plate (1011), the metal bracket (1012), the heat insulation plate (1013) and the inner sealing plate (1014) are sequentially bonded and fixed by an adhesive. The "day"-shaped outer ventilation pipe (5) is attached to the side of the metal bracket (1012) facing the interior of the carriage.

3. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: Small axial flow fans (601) are respectively mounted inside both sides of the air distribution box (6).

4. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: The connecting assembly comprises a connecting cover (602) and a connecting pipe (603). One end of the connecting cover (602) is fixedly connected to one end of the air distribution box (6), the other end of the connecting cover (602) is fixedly connected to one end of the connecting pipe (603), and the other end of the connecting pipe (603) is fixedly penetrated through one side of the top of the "day"-shaped outer ventilation pipe (5) on the corresponding side and is in communication with the "day"-shaped inner ventilation pipe (501).

5. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: The included angle between the axis of each of the plurality of air outlet pipes (504) and the horizontal plane gradually decreases from top to bottom, the axis of the upper air outlet pipe (504) is inclined upward, and the axis of the lower air outlet pipe (504) is inclined downward, so that the outlet ends of all the air outlet pipes (504) are arranged in an arc shape in space.

6. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: A heat-insulating buffer material is filled between the "日"-shaped outer ventilation pipe (5) and the "日"-shaped inner ventilation pipe (501), so as to prevent cold energy from dissipating outwards, and homogenize the temperature of the cold air conveyed inside the "日"-shaped inner ventilation pipe (501).

7. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: A ventilation plate (2) is fixedly connected to the top of the bottom plate (1), the ventilation plate (2) is rectangular, matches the outline of the top of the bottom plate (1), and a ventilation area for guiding air flow to pass through is formed on the plate surface of the ventilation plate (2).

8. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 2, characterized in that: The outer sealing plate (1011) is a glass fiber reinforced plastic plate, the inner sealing plate (1014) is an aluminum alloy plate, a stainless steel plate or a glass fiber reinforced plastic plate, and the heat insulation plate (1013) is high-density rigid polyurethane foam or aerogel felt.

9. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: The sealing connecting member (4) is a broken-bridge heat insulation profile, two sides of the sealing connecting member (4) are respectively clamped or screwed with the edges of adjacent plates, and sealant is filled at the joint.

10. The internal heat insulation structure for a new energy refrigerated truck compartment according to claim 1, characterized in that: The "日"-shaped outer ventilation pipe (5) is a glass fiber reinforced plastic pipe or a rigid polyurethane pipe, and the "日"-shaped inner ventilation pipe (501) is an aluminum alloy pipe.

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