A container refrigeration station system

Abstract

The present invention relates to the technical field of container refrigeration stations and discloses a novel container refrigeration station system, comprising a container, wherein a first outer loading box body and a second outer loading box body are provided on the container, a refrigerant storage tank is provided in the first outer loading box body for storing ice cubes, and the second outer loading box body is used to recover ice water; an installation groove is provided on the container, a first refrigeration wall is provided in the installation groove, and the first refrigeration wall is connected to the refrigerant storage tank and the inner cavity of the second outer loading box body; the novel container refrigeration station system, while taking into account the low-cost advantages of traditional refrigerant-consuming container refrigeration stations, which do not require external power supply or fuel supply, have no moving parts, and have low maintenance requirements, is modified so that it can achieve continuous refrigeration without the need for high-frequency refrigerant replenishment, thereby extending its transportation distance, and can automatically achieve relatively precise temperature control during the freezing process.

Description

Technical Field

[0001] The present invention relates to the technical field of container refrigeration stations, in particular to a container refrigeration station system. Background Art

[0002] A container refrigeration station is a specialized container with good insulation and the ability to maintain a low temperature, suitable for transporting and storing various perishable foods. Container refrigeration stations include refrigerant-based container refrigeration stations, mechanical container refrigeration stations, refrigerated / heated container refrigeration stations, insulated container refrigeration stations, and controlled atmosphere container refrigeration stations.

[0003] Mechanical container refrigeration stations, refrigerated / heated containers, insulated containers, and controlled atmosphere container refrigeration stations all rely on installing refrigeration equipment (such as compression refrigeration units or absorption refrigeration units) inside or connected to the outside of the container to achieve the desired refrigeration. Their advantages include excellent refrigeration performance, high versatility, and the ability to transport goods with varying temperature requirements. They also offer convenient automatic control and relatively uniform temperature distribution within the container, making them suitable for long-distance transportation. Their disadvantages include complex equipment, high initial investment, and high maintenance costs. Furthermore, they require fans and ductwork within the container, which increases the drying and dehydration of the goods.

[0004] Refrigerant-based container refrigeration stations generally refer to any type of container refrigeration station that does not require an external power source or fuel supply, including water ice container refrigeration stations, dry ice container refrigeration stations, and liquid nitrogen container refrigeration stations. Refrigerant-based container refrigeration stations are distinguished by their lack of external power or fuel supply during transportation, lack of moving parts, and low maintenance requirements. Their main disadvantage is the inability to achieve continuous refrigeration. The refrigerant must be recharged or replenished after heat release and consumption, making precise temperature control difficult.

[0005] Therefore, in order to solve the problem that continuous refrigeration cannot be achieved while taking into account the low-cost advantages of refrigerant-consuming container refrigeration stations, the refrigerant storage must be recharged or replenished after heat release and consumption, and it is difficult to achieve precise temperature control, in view of this, the present invention proposes a container refrigeration station system to solve at least one problem existing in the above-mentioned prior art. Summary of the Invention

[0006] The present invention provides a container refrigeration station system, which has the beneficial effect of storing a large amount of refrigerant such as ice cubes in advance through an external box, and then automatically adding ice according to the temperature changes in the box to maintain the refrigerated temperature inside the box. It solves the problem mentioned in the above background technology that the refrigerant-consuming container refrigeration station does not require an external power supply or fuel supply, has no moving parts, and has low maintenance requirements, but cannot achieve continuous refrigeration. The stored refrigerant must be recharged or replenished after heat release and consumption, making it difficult to achieve precise temperature control.

[0007] The present invention provides the following technical solution: a container refrigeration station system, comprising a container, wherein the container is provided with a first external container and a second external container, wherein the first external container is provided with a refrigerant storage tank for storing ice cubes, and the second external container is used for recovering ice water;

[0008] The container is provided with an installation groove, in which a first refrigeration wall is provided, and the first refrigeration wall is in communication with the refrigerant storage tank and the inner cavity of the second outer container;

[0009] A valve mechanism is provided in the first external loading box for controlling the opening and closing of the channel between the refrigerant storage tank and the first refrigeration wall;

[0010] An auxiliary refrigeration mechanism is provided in the container for auxiliary refrigeration, and the auxiliary refrigeration mechanism includes a second refrigeration wall provided in the container, a connecting pipe is provided on the second refrigeration wall, and the connecting pipe is connected to the refrigerant storage tank;

[0011] The first external loading box is further provided with a transmission mechanism for realizing transmission between the valve mechanism and the auxiliary refrigeration mechanism.

[0012] As an optional solution of the container refrigeration station system of the present invention, the valve mechanism includes a valve slot opened on the first external box body, and the valve slot is connected to the refrigerant storage tank, and a valve plate is slidably arranged in the valve slot.

[0013] As an optional solution of the container refrigeration station system described in the present invention, the auxiliary refrigeration mechanism also includes a valve member slidably arranged in the connecting pipe member, a connecting groove is provided on the valve member, and the inner cavity of the valve member is connected to the inner cavity of the connecting pipe member through the connecting groove.

[0014] As an optional solution of the container refrigeration station system of the present invention, the auxiliary refrigeration mechanism further includes a support seat arranged in the connecting pipe, a limiting groove is provided on the support seat, and the valve member is slidably arranged in the limiting groove.

[0015] As an optional solution of the container refrigeration station system described in the present invention, the auxiliary refrigeration mechanism also includes a return spring arranged in the support seat, one end of the return spring is connected to the inner wall of the limiting groove, and the other end of the return spring is connected to the valve member.

[0016] As an optional solution of the container refrigeration station system described in the present invention, the transmission mechanism includes a first rack arranged in the refrigerant storage tank, a rotating rod is rotatably arranged in the refrigerant storage tank, a gear is arranged on the rotating rod, a second rack is arranged on the valve plate, and the second rack and the first rack are both engaged with the gear.

[0017] As an optional solution of the container refrigeration station system described in the present invention, the transmission mechanism also includes a slide groove opened on the connecting pipe, a connecting plate is provided on the valve member, and the connecting plate is slidably set in the slide groove, and the first rack is set on the connecting plate.

[0018] As an optional solution of the container refrigeration station system of the present invention, two of the valve mechanisms and two of the transmission mechanisms are provided, and the two valve mechanisms and the two transmission mechanisms are symmetrically arranged based on the first external container.

[0019] As an optional solution of the container refrigeration station system of the present invention, a first filter plate is provided on the first refrigeration wall, and the auxiliary refrigeration mechanism further includes a second filter plate provided in the refrigerant storage tank.

[0020] As an optional solution of the container refrigeration station system of the present invention, wherein: an insulating door is movably hinged to the first external container body via a hinge shaft, and the insulating door is provided with a handle.

[0021] The present invention has the following beneficial effects:

[0022] 1. This container refrigeration station system, while taking into account the low-cost advantages of traditional refrigerant-consuming container refrigeration stations, which require no external power or fuel supply, have no moving parts, and have low maintenance requirements, is modified to enable continuous refrigeration without frequent refrigerant replenishment, thereby extending its transportation range and automatically achieving more precise temperature control during the freezing process. First, a first external load box is installed on the container, and a large amount of ice can be stored in the refrigerant storage tank in advance as refrigerant. The ice enters the first refrigeration wall through the channel between the refrigerant storage tank and the first refrigeration wall and falls on the first filter plate, cooling the container. After the ice is consumed to a certain extent, it turns into ice water and falls into the second external load box for recycling. At this time, a valve mechanism is used to open the channel between the refrigerant storage tank and the first refrigeration wall to replenish the ice in the first refrigeration wall.

[0023] 2. This container refrigeration station system also includes a second refrigeration wall within the container as an auxiliary refrigeration device. A small amount of ice water in the refrigerant storage tank flows into the second refrigeration wall through a connecting pipe, providing auxiliary refrigeration. The auxiliary refrigeration mechanism also serves as a temperature monitoring mechanism and has two triggering modes. When the temperature within the container rises slightly due to the melting of ice in the first refrigeration wall, the volume change of the water in the second refrigeration wall due to thermal expansion and contraction pushes the valve upward, allowing the water in the second refrigeration wall to exchange heat with the water in the refrigerant storage tank, lowering the temperature of the water in the second refrigeration wall and re-cooling it. When the temperature within the container rises to a certain level, the upward displacement of the valve triggers the transmission mechanism, which then drives the valve plate to slide, opening the connection channel between the refrigerant storage tank and the first refrigeration wall, allowing the ice in the refrigerant storage tank to fall into the first refrigeration wall for replenishment. When the temperature within the container drops to a certain level, the transmission mechanism triggers the valve plate to re-seal the channel between the refrigerant storage tank and the first refrigeration wall.

[0024] 3. The transmission mechanism for triggering the displacement of the valve plate in this container refrigeration station system eliminates the need for electronic temperature measurement equipment, further reducing device costs. Through the transmission action of the first rack, gear, and second rack, the vertical displacement of the valve element is transmitted to the valve plate, causing it to move horizontally and open the channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the overall explosion structure of the present invention.

[0027] Figure 3 It is a schematic diagram of the local explosion structure of the present invention.

[0028] Figure 4 It is a schematic diagram of the internal structure of the present invention.

[0029] Figure 5 For the present invention Figure 4 A partial enlarged view of point A in the middle.

[0030] In the figure: 1. container; 101. mounting groove; 102. first refrigeration wall; 103. first filter plate; 2. first external container; 201. refrigerant storage tank; 202. heat-insulating door; 203. handle; 3. second external container; 4. valve mechanism; 401. valve groove; 402. valve plate; 5. auxiliary refrigeration mechanism; 501. second refrigeration wall; 502. connecting pipe; 503. valve member; 504. connecting groove; 505. support seat; 506. limit groove; 507. return spring; 508. second filter plate; 6. transmission mechanism; 601. slide groove; 602. connecting plate; 603. first rack; 604. rotating rod; 605. gear; 606. second rack. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0032] In order to solve the shortcomings of the traditional refrigerant-consuming container refrigeration station that cannot provide continuous refrigeration and is difficult to achieve precise temperature control under the low-cost advantage of refrigerant refrigeration, embodiment 1 is proposed;

[0033] See also Figure 1-Figure 5 , comprising a container 1, on which a first outer container body 2 and a second outer container body 3 are provided, wherein a refrigerant storage tank 201 is provided in the first outer container body 2 for storing ice cubes, and the second outer container body 3 is used for recovering ice water;

[0034] The container 1 is provided with a mounting groove 101, in which a first refrigeration wall 102 is provided. The first refrigeration wall 102 is in communication with the refrigerant storage tank 201 and the inner cavity of the second outer container 3;

[0035] A valve mechanism 4 is provided in the first external container 2 for controlling the opening and closing of the passage between the refrigerant storage tank 201 and the first refrigeration wall 102;

[0036] An auxiliary refrigeration mechanism 5 is provided in the container 1 for auxiliary refrigeration. The auxiliary refrigeration mechanism 5 includes a second refrigeration wall 501 provided in the container 1. A connecting pipe 502 is provided on the second refrigeration wall 501, and the connecting pipe 502 is connected to the refrigerant storage tank 201.

[0037] A transmission mechanism 6 is further provided in the first external box body 2 for realizing transmission between the valve mechanism 4 and the auxiliary refrigeration mechanism 5 .

[0038] The container 1 is the main part of the container refrigeration station for storing goods. Goods can be placed in the container 1 by opening its door. The container 1 is provided with a mounting groove 101, which runs through the upper and lower ends of the container 1. The mounting groove 101 is provided with a hollow first refrigeration wall 102 in the shape of a convex shape.

[0039] A first outer box 2 is detachably mounted on the upper end of the container 1, and a second outer box 3 is detachably mounted on the lower end of the container 1. A refrigerant storage tank 201 is provided in the first outer box 2 for storing refrigerant. In this device, ice is used as the refrigerant to further reduce refrigeration costs. The refrigerant storage tank 201 is connected to the first refrigeration wall 102. When the ice enters the first refrigeration wall 102, it serves to freeze and preserve the goods in the container 1.

[0040] After absorbing heat and melting, the ice cubes fall into the second outer container 3 for recycling. A second refrigeration wall 501 is fixed to the upper inner wall of the container 1. The inner cavity of the second refrigeration wall 501 is connected to the refrigerant storage tank 201 through a connecting pipe 502. The ice water melted by the ice cubes in the refrigerant storage tank 201 enters the second refrigeration wall 501 to assist in refrigeration.

[0041] In addition, the auxiliary refrigeration mechanism 5 also serves as a temperature monitoring device. When the temperature in the container 1 begins to rise to a certain level, the transmission mechanism 6 drives the valve mechanism 4 to open the passage between the refrigerant storage tank 201 and the first refrigeration wall 102 to replenish ice cubes.

[0042] The container 1, the first external container body 2 and the second external container body 3 are made of heat-insulating materials including end walls, side walls, doors, bottom and top, which can prevent heat exchange between the inside and outside.

[0043] It should be noted that, depending on the actual temperature requirements for freezing goods in production, other refrigerants such as dry ice can be used instead of ice. Example

[0044] In order to control the opening and closing of the channel between the refrigerant storage tank 201 and the first refrigeration wall 102, embodiment 2 is proposed;

[0045] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 2-Figure 5 The valve mechanism 4 includes a valve groove 401 opened on the first outer box body 2, and the valve groove 401 is connected to the refrigerant storage tank 201, and a valve plate 402 is slidably provided in the valve groove 401.

[0046] Among them, the valve groove 401 is opened on the side wall of the refrigerant storage tank 201, and the valve plate 402 is slidably installed in the valve groove 401. When the valve plate 402 blocks the valve groove 401, it will block the communication channel between the refrigerant storage tank 201 and the first refrigeration wall 102, and when the valve plate 402 slides away, the channel will be opened. Example

[0047] In order to allow the ice water in the refrigerant storage tank 201 to enter the second refrigeration wall 501 and perform alternating hot and cold convection according to the temperature change in the container 1, embodiment 3 is proposed;

[0048] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 2-Figure 5 The auxiliary refrigeration mechanism 5 further includes a valve member 503 slidably disposed in the communicating pipe member 502 , a communicating groove 504 is provided on the valve member 503 , and an inner cavity of the valve member 503 is communicated with the inner cavity of the communicating pipe member 502 through the communicating groove 504 ;

[0049] The auxiliary refrigeration mechanism 5 further includes a support base 505 disposed in the connecting pipe 502. The support base 505 is provided with a limiting groove 506, and the valve member 503 is slidably disposed in the limiting groove 506.

[0050] The auxiliary refrigeration mechanism 5 further includes a return spring 507 disposed in the support seat 505 , one end of the return spring 507 is connected to the inner wall of the limiting groove 506 , and the other end of the return spring 507 is connected to the valve member 503 .

[0051] A valve member 503 is slidably mounted within the connecting pipe 502. A plurality of connecting grooves 504 are formed on the surface of the valve member 503 and are evenly distributed across the surface. A support seat 505 is fixed to the inner wall of the connecting pipe 502. A limiting groove 506 is defined at the lower end of the support seat 505. The valve member 503 slides up and down along the limiting groove 506. The ends of a return spring 507 are respectively fixed to the upper inner wall of the limiting groove 506 and the upper end of the valve member 503.

[0052] The valve member 503 can be lifted upward to a certain extent by the elastic force of the return spring 507, so that the ice water in the refrigerant storage tank 201 can pass through the upper end opening of the connecting pipe 502 to the inner cavity of the valve member 503 and then enter the second refrigeration wall 501 through several connecting grooves 504 and the lower end opening of the connecting pipe 502, until the hydraulic pressure difference on both sides causes the valve member 503 to slide downward to seal with the side wall of the connecting pipe 502, and the ice water in the refrigerant storage tank 201 no longer flows into the second refrigeration wall 501.

[0053] When the temperature inside container 1 rises, the temperature of the ice water in second refrigeration wall 501 rises, causing thermal expansion and contraction. The increased volume of water in second refrigeration wall 501 pushes valve 503 upward, allowing convection heat exchange between the water in second refrigeration wall 501 and the water in refrigerant storage tank 201. This lowers the temperature of the water in second refrigeration wall 501 and replenishes refrigerant. Valve 503 returns to its original position when the hydraulic pressure difference between the two sides is balanced again.

[0054] The valve member 503 slides sealedly along the limiting groove 506, which limits the valve member 503 and makes its sliding more stable. The reset spring 507 is arranged in the limiting groove 506 so that it does not come into contact with water, which also protects the reset spring 507. Example

[0055] In order to realize the transmission between the auxiliary refrigeration mechanism 5 and the valve mechanism 4, when the temperature in the container 1 rises to a certain level, the valve member 503 can be moved to a certain level, and then the valve mechanism 4 can be transmitted to open the passage between the refrigerant storage tank 201 and the first refrigeration wall 102 to replenish ice cubes in the first refrigeration wall 102.

[0056] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 2-Figure 5 The transmission mechanism 6 includes a first rack 603 disposed in the refrigerant storage tank 201, a rotating rod 604 is rotatably disposed in the refrigerant storage tank 201, a gear 605 is disposed on the rotating rod 604, a second rack 606 is disposed on the valve plate 402, and the second rack 606 and the first rack 603 are both engaged with the gear 605;

[0057] The transmission mechanism 6 further includes a slide groove 601 provided on the connecting pipe 502 . A connecting plate 602 is provided on the valve member 503 . The connecting plate 602 is slidably provided in the slide groove 601 . The first rack 603 is provided on the connecting plate 602 .

[0058] Among them, a sliding groove 601 extending through outward is opened on the side wall of the connecting pipe 502, and a connecting plate 602 is fixed on the surface of the valve member 503. The connecting plate 602 slides up and down along the sliding groove 601, and a first rack 603 is fixed on the connecting plate 602. The first rack 603 is distributed in a straight line up and down. The two ends of the rotating rod 604 are rotatably installed on the front and rear inner walls of the refrigerant storage tank 201 respectively. A gear 605 is fixed on the surface of the rotating rod 604, and a second rack 606 is fixed on the upper end of the valve plate 402. The second rack 606 is distributed in a straight line left and right, and the first rack 603 and the second rack 606 are both engaged with the gear 605.

[0059] When the valve member 503 rises to a certain level, the first rack 603 engages with the gear 605 and moves further upward, thereby driving the gear 605 to rotate, and then driving the second rack 606 to move toward the inside of the first outer box 2, so that the valve plate 402 moves to open the channel. Example

[0060] In order to speed up the ice replenishment and timely maintain the temperature in the container 1, embodiment 5 is proposed;

[0061] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 2-Figure 5 There are two valve mechanisms 4 and two transmission mechanisms 6, and the two valve mechanisms 4 and the two transmission mechanisms 6 are symmetrically arranged based on the first external box body 2.

[0062] Two valve mechanisms 4 and two transmission mechanisms 6 are provided, each symmetrically positioned about the centerline of the first external container 2. The two valve mechanisms 4 correspond to the two transmission mechanisms 6. Accordingly, two channels are provided for the refrigerant storage tank 201 to replenish ice cubes to the first refrigeration wall 102, accelerating ice replenishment. Example

[0063] In order to prevent ice cubes in the refrigerant storage tank 201 from falling into the connecting pipe 502 and to prevent ice cubes in the first refrigeration wall 102 from falling into the second external container 3, embodiment 6 is proposed;

[0064] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 2-Figure 5 A first filter plate 103 is provided on the first refrigeration wall 102 , and the auxiliary refrigeration mechanism 5 further includes a second filter plate 508 provided in the refrigerant storage tank 201 .

[0065] The second filter plate 508 and the first filter plate 103 are provided so that the filter holes thereof are configured to allow only ice water to pass through. Example

[0066] In order to facilitate the replenishment of ice cubes into the refrigerant storage tank 201, embodiment 7 is proposed;

[0067] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figures 1-4 The first external box body 2 is hinged with an insulation door 202 through a hinge shaft, and a handle 203 is provided on the insulation door 202.

[0068] An insulating door 202 is installed at the upper opening of the refrigerant storage tank 201 via a hinge shaft, and the insulating door 202 can be driven to rotate up and down by pulling the handle 203.

[0069] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A container refrigeration station system, characterized by: The invention comprises a container (1), wherein a first outer container (2) and a second outer container (3) are provided on the container (1); a refrigerant storage tank (201) is provided in the first outer container (2) for storing ice cubes, and the second outer container (3) is used to recover ice water; a mounting groove (101) is provided on the container (1), a first refrigeration wall (102) is provided in the mounting groove (101), and the first refrigeration wall (102) is communicated with the refrigerant storage tank (201) and the inner cavity of the second outer container (3); a valve mechanism (401) is provided in the first outer container (2) ) is used to control the opening and closing of the channel between the refrigerant storage tank (201) and the first refrigeration wall (102); an auxiliary refrigeration mechanism (5) is provided in the container (1) for auxiliary refrigeration, and the auxiliary refrigeration mechanism (5) includes a second refrigeration wall (501) provided in the container (1), and a connecting pipe (502) is provided on the second refrigeration wall (501), and the connecting pipe (502) is connected to the refrigerant storage tank (201); a transmission mechanism (6) is also provided in the first outer container (2) for realizing transmission between the valve mechanism (4) and the auxiliary refrigeration mechanism (5); The valve mechanism (4) includes a valve groove (401) provided on the first outer carrying box (2), the valve groove (401) is communicated with the refrigerant storage tank (201), and a valve plate (402) is slidably provided in the valve groove (401); the auxiliary refrigeration mechanism (5) also includes a valve member (503) slidably provided in the communicating pipe member (502), a communicating groove (504) is provided on the valve member (503), and the inner cavity of the valve member (503) is communicated with the inner cavity of the communicating pipe member (502) through the communicating groove (504). The auxiliary refrigeration mechanism (5) further comprises a support seat (505) arranged in the connecting pipe (502), a limiting groove (506) is provided on the support seat (505), and the valve member (503) is slidably arranged in the limiting groove (506); the auxiliary refrigeration mechanism (5) further comprises a return spring (507) arranged in the support seat (505), one end of the return spring (507) is connected to the inner wall of the limiting groove (506), and the other end of the return spring (507) is connected to the valve member (503); The transmission mechanism (6) includes a first rack (603) arranged in the refrigerant storage tank (201), a rotating rod (604) rotatably arranged in the refrigerant storage tank (201), a gear (605) arranged on the rotating rod (604), a second rack (606) arranged on the valve plate (402), and the second rack (606) and the first rack (603) are both engaged with the gear (605); the transmission mechanism (6) also includes a sliding groove (601) opened on the connecting pipe (502), a connecting plate (602) arranged on the valve member (503), the connecting plate (602) slidably arranged in the sliding groove (601), and the first rack (603) is arranged on the connecting plate (602).

2. The container refrigeration station system according to claim 1, characterized in that: Two valve mechanisms (4) and two transmission mechanisms (6) are each provided, and the two valve mechanisms (4) and the two transmission mechanisms (6) are symmetrically arranged based on the first external carrier box (2).

3. The container refrigeration station system according to claim 2, characterized in that: A first filter plate (103) is provided on the first refrigeration wall (102), and the auxiliary refrigeration mechanism (5) further includes a second filter plate (508) provided in the refrigerant storage tank (201).

4. The container refrigeration station system according to claim 3, characterized in that: An insulating door (202) is movably hinged to the first external carrying box (2) via a hinge shaft, and a handle (203) is provided on the insulating door (202).

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