Ventilation air duct device

Abstract

The utility model relates to the technical field of cold chains, and particularly discloses a ventilation air duct device, one end of which is connected with an air supply outlet of a centrifugal fan and the other end is communicated with the external environment. The centrifugal fan is fixedly mounted in the air supply box; comprising an air outlet box of a cubic hollow structure; an air supply box is fixedly installed on one side face of the partition plate, an air outlet box is fixedly installed on the other side face of the partition plate and used for separating the air outlet box from the air supply box, and a first through opening is formed in the partition plate and is close to the centrifugal fan; one end of the first air duct is communicated with the air supply outlet of the centrifugal fan, and the other end of the first air duct is communicated with the air outlet box and used for guiding air of the centrifugal fan to be sent to the air outlet box; the air uniformizing plates are arranged on the air outlet box, each air uniformizing plate is provided with a plurality of air outlets, and the air outlet volumes of the air outlets are the same. The utility model can control the uniformity of the air volume.

Description

Technical Field

[0001] The utility model relates to the technical field of cold chain, in particular to a ventilation duct device. Background Art

[0002] Vegetables, fruits, flowers, fish, meat, eggs, and milk often require refrigerated storage and transportation to ensure their quality. Cold storage pre-cooling and refrigerated container transportation significantly reduce the damage rate of fresh produce and improve their freshness. Current refrigerated container refrigeration units (including the condenser, evaporator, and compressor) are typically located at the front of the container. Once the goods are placed inside, the refrigeration unit moves the remaining air along the length of the container toward the rear and back, creating a circulating cool air surface that preserves the goods.

[0003] Environmentally sensitive goods like fruits, vegetables, and flowers carry heat from the outside environment into refrigerated containers, as well as heat generated by the goods' own respiration during transportation. Furthermore, the stacking of goods in refrigerated containers raises the temperature inside the storage space, accelerating the aging of the goods, leading to rotting and spoilage, and increasing the rate of cargo damage. When transporting goods in refrigerated containers, the heat generated by the goods and the circulating cold air cause large temperature fluctuations within the container, causing changes in the relative humidity of the container air. These changes in relative humidity lead to moisture loss from the goods, causing dryness. Furthermore, this dryness loss is directly proportional to temperature fluctuations. During storage and transportation, goods continuously generate significant heat through their own respiration, resulting in significant temperature fluctuations, which is extremely detrimental to the safe storage of goods. The prior art believes that ventilation ducts using an upper air outlet form come into contact with the rising heat generated by the cargo. Due to the high heat, it is difficult for the air in the refrigerated container to circulate, resulting in poor temperature uniformity inside the refrigerated container, which leads to heat accumulation in the container, damage to the cargo due to overheating, and a high cargo damage rate during transportation. In the prior art, a refrigerated container with patent application number CN202311247643.1 uses an air circulation form with lower air outlet and upper air return to improve the temperature uniformity inside the container; at the same time, when the air is discharged from the lower side, the air is discharged from the side wall away from the container door, that is, an air outlet is provided on the side wall away from the container door. The distance between the container door and the side wall away from the door is long, and when the air is discharged from the side wall, it is easily blocked by the cargo next to the air outlet, resulting in the air flowing only along the top of the cargo. Moreover, the cargo near the container door is far away from the air outlet, which results in uneven temperature between the cargo near the air outlet and the cargo near the container door. Using such an air outlet structure located on the side wall makes it difficult to maintain a uniform temperature throughout the container.

[0004] To solve the problem of uneven temperature of the entire container caused by installing the air outlet on the side wall away from the container door in the prior art, such as the refrigerated container and refrigerated transport vehicle with patent application number CN201120467342.6, the patent sets a box partition in the refrigerated container to divide the space for storing goods into multiple sub-storage spaces, each of which corresponds to a sub-return air trough and a sub-outlet air trough, thereby forming multiple independent refrigerated environments, and the temperature of each sub-storage space is controlled separately by an evaporator corresponding to each sub-storage space. The sub-return air trough is installed on the side of the box body, and the sub-outlet air trough is installed on the top of the box body. In addition, multiple porous containers for accommodating goods can be provided, and the porous containers are stacked inside the container body. By providing the porous containers, the low-temperature, high-pressure air flow blown out from the outlet trough can flow through the goods in the porous containers, causing the outer surface and the interior of the goods to cool down quickly and synchronously. This patent provides two solutions to control the uniformity of the temperature inside the container body: setting multiple evaporators or setting porous containers, but both have certain defects. Setting up multiple evaporators to control the temperature of each sub-storage space separately will result in a high cost for purchasing equipment. Setting up multiple porous containers to be stacked inside the container body, first, stacking the porous containers on the cargo inside the container will not only take up a large space but also reduce the amount of cargo to be assembled; second, the position of the hair dryer is fixed, and the airflow blown out from the air outlet slot is not uniform in the space between the porous container and the hair dryer. The airflow moves downward through the porous container. Due to the different airflow intensities at different spatial positions, the airflow intensity of each hole in the porous container is also different when passing through the porous container. It is more about reducing the volume of a single porous container to make the airflow intensity inside the container more uniform. However, the airflow intensities in multiple porous containers are not the same, so it is impossible to ensure that the cargo is subjected to uniform cold airflow. It can be seen that in the current existing technology, other technical accessories are mostly relied on in combination with ventilation ducts to solve the problem of temperature uniformity inside the container. Therefore, how to modify the ventilation duct to solve the problem of temperature uniformity is an issue that is currently in urgent need of resolution. Utility Model Content

[0005] The utility model aims to provide a ventilation duct device for solving the temperature unevenness in a refrigerated container at a low cost.

[0006] The first basic solution: a ventilation duct device, one end of which is connected to the air supply port of a centrifugal fan, and the other end is connected to the external environment; the centrifugal fan is fixedly installed in the air supply box; it includes: an air outlet box, which is a square hollow structure; a partition, on one side of which the air supply box is fixedly installed, and on the other side of which the air outlet box is fixedly installed, for separating the air outlet box from the air supply box, and a first opening is opened on the partition, and the first opening is close to the centrifugal fan; a first air duct, passing through the first opening, one end is connected to the air supply port of the centrifugal fan, and the other end is connected to the air outlet box, for guiding the air volume of the centrifugal fan to the air outlet box; a plurality of air equalizing plates are provided on the air outlet box, each air equalizing plate is provided with a plurality of air outlets, and the air volume of each air outlet is the same; the air outlet is used to guide the air volume in the air outlet box to the external environment.

[0007] Beneficial effects: The structure is different from that of the prior art. First, this solution sets multiple air outlets on the air balancing plate, and makes the air output of each air outlet the same. The air outlets on the air balancing plate are improved so that the air output of each air outlet is consistent. This not only eliminates the need to add multiple evaporators to ensure the uniformity of the air output of the air outlets as in the prior art, but also reduces costs.

[0008] Preferably, the air outlets are arranged in a matrix on the air distribution plate.

[0009] Beneficial effects: This can initially increase the uniformity of airflow distribution and ensure that the airflow is evenly diffused throughout the entire coverage area, reducing airflow dead corners and improving ventilation efficiency.

[0010] Preferably, the diameters of the transverse air outlets are different, and the diameters of the longitudinal air outlets are the same.

[0011] Beneficial effects: Horizontal air outlets of different diameters can be adjusted according to needs, increasing the adjustability and adaptability of air outlet.

[0012] Preferably, the distance between two adjacent air outlets on the same air balancing plate is 200 mm.

[0013] Beneficial Effect: A 200mm spacing allows airflows to complement each other without excessive overlap, thus preventing areas of excessive or weak airflow. At the same time, 200mm spacing strikes a balance between airflow interference caused by air outlets spaced too far apart and insufficient ventilation in certain areas.

[0014] Preferably, the diameter of the air outlet is 47.4-55.9 mm.

[0015] Beneficial effect: The diameter of the air outlet is between 47.4-55.9 mm, which can make the air outlet volume consistent.

[0016] Preferably, at least two air balancing plates are provided, and a transverse beam is fixed between every two air balancing plates.

[0017] Beneficial effect: The setting of the crossbeam can enhance the stability between the wind equalizing plates.

[0018] Preferably, the first air duct is a conical air duct; the conical air duct is a pipe structure, the end of the conical air duct with the smallest cross-sectional area is close to the centrifugal fan, and the end of the conical air duct with the largest cross-sectional area is close to the air equalizing plate.

[0019] Beneficial effect: By setting up a tapered air duct and placing the end with the largest cross-sectional area of ​​the tapered air duct close to the air balancing plate, the air volume delivered by the tapered air duct can be distributed more evenly through the air outlet on the air balancing plate over a larger area.

[0020] The second basic solution: A refrigerated container, wherein a ventilation duct device is installed above the inner wall, and the air outlet direction is from top to bottom.

[0021] Beneficial effect: By arranging a ventilation duct device above the interior of the refrigerated container and outputting air volume through the air outlet, the air flow in the refrigerated container is made more uniform.

[0022] Preferably, the air distribution plate covers at least 98% of the upper surface area of ​​the refrigerated container.

[0023] Beneficial effect: The area coverage rate of the air outlet on the upper surface of the refrigerated container reaches 98%, and the air volume is delivered through the air outlet, which can make the airflow in the refrigerated container more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a ventilation duct device according to the first embodiment;

[0025] Figure 2 This is a schematic diagram of the partial structure of a ventilation duct device according to the first embodiment;

[0026] Figure 3 (a) is a structural schematic diagram of a refrigerated container according to the second embodiment;

[0027] Figure 4 This is a partial enlarged schematic diagram of the structural schematic diagram (a) of a refrigerated container in Example 2;

[0028] Figure 5 This is a side view of a refrigerated container according to the second embodiment;

[0029] Figure 6 (b) is a structural schematic diagram of a refrigerated container in Example 2. DETAILED DESCRIPTION

[0030] The reference numerals in the drawings of the specification include:

[0031] Centrifugal fan 1, partition 2, tapered channel 3, air equalizing plate 4, air outlet 5, air outlet box 6, door 7, cargo area 8, air supply box 9, evaporator 10, return air box 11, shutter 12, first vent 13.

[0032] Example 1

[0033] This embodiment provides a ventilation duct device, one end of which is connected to two centrifugal fans 1 and the other end is connected to the external environment. The centrifugal fans 1 supply air to the ventilation duct device, which then delivers the air to the external environment.

[0034] Specifically, such as Figure 1 As shown, the ventilation duct device includes an air outlet box 6, a partition 2, two first air ducts and five air distribution plates 4. The air outlet box 6 is a square hollow structure, and the air distribution plates 4 are fixedly installed under the air outlet box. In the prior art, the centrifugal fan 1 is fixedly installed in the air supply box 9. Two supporting square tubes are fixedly installed on the inner wall of the air supply box 9 by bolts, and a centrifugal fan 1 is fixedly installed on each supporting square tube by bolts. Figure 1 As shown, the centrifugal fan 1 is installed on the right side of the air supply box 9. Figure 1 The air supply box 9 and the air outlet box 6 in the figure have upper covers. In order to reflect the internal structure of the two boxes, the upper covers are not shown. The air outlet box 6 and the air supply box 9 are separated by a partition 2, and the air outlet box and the air supply box 9 are fixedly mounted on both sides of the partition 2 respectively. There are two first openings on the partition 2, the first opening is located below the air equalizing plate 4, and the first air duct passes through the first opening. In this embodiment, the first air duct is a conical air duct, and the conical air duct is a pipe structure. The conical air duct has two ends, one end has the largest cross-sectional area, and the other end has the smallest cross-sectional area, and from the end with the largest cross-sectional area, the cross-sectional area gradually decreases until it reaches the other end with the smallest cross-sectional area. The end with the largest cross-sectional area of ​​the conical air duct is connected to the air equalizing plate 4, and the end with the smallest cross-sectional area of ​​the conical air duct is connected to the air supply port of the centrifugal fan 1.

[0035] Specifically, such as Figure 2As shown, two first ventilation holes 13 are provided on the air balancing plate 4 on the far left, and the first ventilation holes 13 are flush with the surface with the largest cross-sectional area of ​​the conical air duct. The surface with the smallest cross-sectional area of ​​the conical air duct is the same as and matches the surface area of ​​the air outlet of the centrifugal fan 1. The air balancing plate 4 at the far left is provided with 4*10 air outlets 5. The three middle air balancing plates 4 are each provided with 6*10 air outlets 5, and the air balancing plate 4 at the far right is provided with 2*10 air outlets 5. In this embodiment, there are a total of 24*10 air outlets 5, and the air outlets 5 are hole-shaped structures. On the same air balancing plate 4, the distance between each air outlet 5 is b, b=200mm. The diameters of the 24 air outlets 5 in the horizontal direction are different, and the diameters of the 10 air outlets 5 in the vertical direction are the same. The diameter of the air outlet 5 is between 47.40-55.90mm. Counting from left to right, the diameters of the 24 air outlets 5 are 52.50mm, 51.87mm, 50.80mm, 50.53mm, 50.29mm, 49.84mm, 50.73mm, 50.46mm, 49.10mm, 53.43mm, 55.90mm, 52.79mm, 50.27mm, 47.40mm, 48.23mm, 49.37mm, 50.80mm, 50.06mm, 49.10mm, 48.32mm, 47.40mm, 47.90mm, 48.43mm, and 49.10mm, respectively. By setting the size of the air outlets 5 in this manner, it is possible to ensure that the air output of each air outlet 5 is consistent. In this embodiment, the model of the centrifugal fan 1 is the Runxi centrifugal fan 4-72-3.2A. In this embodiment, if Figure 1 As shown, since the first vents 13 are arranged in a longitudinal direction, the airflow sent out by the first vents 13 is diffused from the first vents 13 to the other side of the air outlet box 6 when it is diffused, so that the airflow of each of the 10 longitudinal air outlets 5 is the same. The two first vents 13 are placed close to the longitudinal air outlet 5. This is to ensure that the air volume sent out by the longitudinal air outlet 5 is the same, thereby improving the uniformity of the air volume of the air outlet 5. In this way, only the size of the horizontal air outlet 5 needs to be designed to ensure the uniformity of the air volume of all the air outlets 5, which reduces the difficulty of designing the air outlet 5 for the staff.

[0036] The ventilation duct device further includes four transverse beams, which can be fixedly installed between two adjacent air balancing plates 4 by bolts. The transverse beams are installed between the two air balancing plates 4 to improve the stability of the air balancing plates 4. In this embodiment, the external environment can be the cargo area 8 of the container.

[0037] Example 2

[0038] like Figure 3 、 Figure 4 and Figure 5As shown, this embodiment provides a refrigerated container. A ventilation duct device is installed above the inner wall of the refrigerated container. The ventilation duct device can refer to the first embodiment. The air outlet 5 directs air from top to bottom. In this embodiment, the length, width, and height of the refrigerated container are 5140 mm, 2175 mm, and 2280 mm, respectively.

[0039] According to the implementation of the first embodiment, the air supply box 9 can be fixedly installed above the inner wall of the refrigerated container, and the air outlet 5 is directed from top to bottom. Specifically, the air outlet 5 in the ventilation duct device is directed from the air supply box 6 through the air outlet 5 toward the cargo area 8 in the refrigerated container.

[0040] In this embodiment, to further reduce costs and achieve better ventilation uniformity within the refrigerated container, the refrigerated container is modified accordingly, specifically involving a ventilation duct device in Example 1. Furthermore, the specific quantities of the various components in the ventilation duct device in Example 1 can also be used in this embodiment, and are suitable for the modification of a refrigerated container of the size in this embodiment.

[0041] Specifically, the air equalizing plate 4 can be fixedly installed at a position 2200mm away from the bottom of the refrigerated container by welding, a=2200mm. Transverse beams are fixedly installed between the air equalizing plates 4, and the stability of the air equalizing plate 4 structure is improved by the setting of the transverse beams. At the same time, the plane formed by the four transverse beams and the five air equalizing plates 4 can just cover the upper surface of the inner wall of the refrigerated container, that is, the side of the air equalizing plate 4 can be fixedly installed on the inner wall of the refrigerated container by welding. In this way, by covering the air equalizing plate 4 on the upper surface of the refrigerated container, the air outlet 5 can be located at various positions in the box, and the air volume of the air outlet 5 is consistent, that is, the uniformity of the air volume in the refrigerated container can be improved. The return air box 11 is located below the supply air box 9, and the return air box 11 is fixedly connected to the supply air box 9. The return air box 11 and the supply air box 9 are connected, and the specific connection is a conventional technical means.

[0042] like Figure 6 As shown, a return air box 11 is provided on the side wall of the container away from the container door 7, and the top of the return air box 11 is connected to the bottom of the supply air box 9. The return air box 11 is a square three-dimensional structure. A louver 12 is provided on the side wall of the return air box 11 close to the cargo area 8 of the container. The return air box 11 is connected to the cargo area 8 of the refrigerated container through the louver 12, and the air in the cargo area 8 of the refrigerated container is returned to the return air box 11 through the louver 12 of the return air box 11. An evaporator 10 is fixedly installed in the return air box 11. The evaporator 10 is located above the louver 12, and the air flow evaporated by the evaporator 10 will be transported to the centrifugal fan 1. In this embodiment, the air balancing plate 4 is welded to the side wall of the container, so that the area of ​​the air balancing plate 4 covers 98% of the area of ​​the upper surface of the cargo area 8 of the refrigerated container.

[0043] Beneficial effects of this embodiment

[0044] Patent application number CN202311247643.1 discloses a refrigerated container. This prior art designates an air outlet 5 located on a sidewall away from the container door 7. The distance between the container door and the sidewall away from the door is long, and when air is discharged from the sidewall, it is easily blocked by cargo near the air outlet 5, resulting in the air flowing only along the top of the cargo. Furthermore, cargo near the container door 7 is further away from the air outlet 5, resulting in uneven temperatures between cargo near the air outlet 5 and cargo near the container door 7. Prior art methods, such as the refrigerated container and refrigerated transport vehicle disclosed in patent application number CN201120467342.6, employ two approaches to control the temperature uniformity within the container: one employing multiple evaporators 10 or a porous container. However, this approach is not only costly, but also results in uneven airflow from the air outlet slots in the gap between the porous container and the blower. The airflow intensity at each hole in the porous container varies, and this fails to ensure that the cargo receives uniform cooling airflow.

[0045] First of all, the structure of the refrigerated container of this embodiment is completely different from the prior art. This refrigerated container sets a ventilation duct device at the top of the interior to change the air outlet direction from top to bottom, and the air equalizing plate 4 covers the upper surface of the container cargo area 8, which is equivalent to being able to directly supply air into each area of ​​the cargo area 8.

[0046] Secondly, by providing the air balancing plate 4 and installing a plurality of air outlets 5 with a uniform air volume on the air balancing plate 4, the uniformity of the temperature in the container can be improved.

[0047] Finally, in this embodiment, there is no need to modify the cargo area 8 of the container or add an evaporator 10 to improve temperature uniformity, which further reduces costs.

[0048] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0049] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0050] It should be understood that the term "and / or" as used herein is simply a term used to describe the existence of three possible relationships between related objects. For example, "A and / or B" can represent the existence of A alone, the existence of both A and B, and the existence of B alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0051] Although the subject matter has been described in language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

[0052] The above is only an embodiment of the present utility model. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A ventilation duct device, one end of which is connected to the air outlet of a centrifugal fan and the other end is connected to the external environment; the centrifugal fan is fixedly installed in the air supply box; characterized in that: include: The air outlet box is a square hollow structure; A partition, with an air supply box fixedly mounted on one side and an air outlet box fixedly mounted on the other side, for separating the air outlet box from the air supply box, and a first opening is opened on the partition, the first opening being close to the centrifugal fan; a first air duct passing through the first opening, one end of which is connected to the air supply port of the centrifugal fan, and the other end of which is connected to the air outlet box, for guiding the air volume of the centrifugal fan to be sent to the air outlet box; Several air balancing plates are provided on the air outlet box. Each air balancing plate is provided with multiple air outlets, and the air outlet of each air outlet is the same; the air outlet is used to guide the air in the air outlet box to the external environment.

2. A ventilation duct device according to claim 1, characterized in that: The air outlets are arranged in a matrix on the air distribution plate.

3. A ventilation duct device according to claim 2, characterized in that: The diameters of the horizontal air outlets are different, while the diameters of the vertical air outlets are the same.

4. A ventilation duct device according to any one of claims 1 to 3, characterized in that: The distance between two adjacent air outlets on the same air balancing plate is 200mm.

5. A ventilation duct device according to any one of claims 1 to 3, characterized in that: The diameter of the air outlet is 47.4-55.9mm.

6. A ventilation duct device according to claim 1, characterized in that: The first air duct is a conical air duct; the conical air duct is a pipe structure, the end of the conical air duct with the smallest cross-sectional area is close to the centrifugal fan, and the end of the conical air duct with the largest cross-sectional area is close to the air balancing plate.

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