Crossbeam and cryopreservation case comprising same

Abstract

The application relates to a cross beam and a low-temperature preservation box containing the same, and belongs to the technical field of low-temperature preservation. The cross beam comprises a cross beam body and a baffle. A through cavity is arranged in the cross beam body and extends along the length direction of the cross beam body. A reinforcing rib is arranged in the through cavity to increase the overall structural strength of the cross beam body. The reinforcing rib is arranged along the length direction of the cross beam body. One side of the cross beam body in the thickness direction is in contact with a door body, and the other side of the cross beam body in the thickness direction is arranged towards the inside of a box body. Two baffles are arranged at the two ends of the length direction of the cross beam body. A hole channel is arranged on the side of the baffle away from the cross beam body, and the hole channel penetrates through the baffle along the thickness direction of the cross beam body. The cross beam has high overall strength, and airflow can pass through the cross beam, so that the air pressure inside and outside the low-temperature preservation box is balanced, and the door body is conveniently opened.

Description

Technical Field

[0001] This application belongs to the field of cryogenic preservation technology, and in particular relates to a crossbeam and a cryogenic preservation box containing the crossbeam. Background Technology

[0002] The crossbeam is an important component of the low-temperature storage box. On the one hand, the crossbeam is located at the cabinet opening, which enhances the stability of the cabinet opening through rigid support; on the other hand, the crossbeam and the sealing strip on the cabinet door fit together tightly to form a sealed storage space inside the cabinet.

[0003] However, existing crossbeams lack an effective pressure balancing mechanism. When the storage chamber operates at low temperatures, the temperature difference between the inside and outside exacerbates the pressure imbalance and creates a significant pressure differential, preventing the chamber door from opening properly. Users must passively wait for the pressure to equalize before opening the door, which not only prolongs operation time and reduces efficiency but also causes significant cold air loss due to the door remaining open for extended periods, leading to temperature fluctuations inside the chamber. When temperature-sensitive reagents, biological samples, or other materials are stored in the low-temperature storage chamber, repeated temperature fluctuations may result in loss of activity or deterioration. Furthermore, the air in operating rooms, laboratories, and similar settings often contains microbial particles. When users repeatedly attempt to open the door due to difficulty, the negative pressure inside the chamber may draw in unfiltered air. This continuous infiltration of external air significantly increases the risk of sample contamination, posing a potential threat to storage safety.

[0004] In addition, the existing crossbeams have problems such as complex manufacturing process, high production cost, and insufficient structural strength. They are prone to deformation or deterioration of sealing performance after long-term use, which further affects the reliability and service life of the storage box.

[0005] Therefore, it is of great significance to design a crossbeam that can balance the air pressure inside and outside the box, improve the structural strength, and reduce the manufacturing cost. Utility Model Content

[0006] In view of the shortcomings of the related technologies, this application provides a crossbeam and a cryogenic storage box containing the crossbeam, which can not only increase the overall structural strength of the crossbeam, but also allow airflow to pass through the crossbeam, thereby balancing the air pressure inside and outside the cryogenic storage box and avoiding the phenomenon that the door is difficult to open under the action of pressure difference.

[0007] This application provides a crossbeam, including:

[0008] The crossbeam body has a through cavity inside, which extends along the length of the crossbeam body; the through cavity has reinforcing ribs, which are set along the length of the crossbeam body; one side of the crossbeam body in the thickness direction contacts the door body, and the other side of the crossbeam body in the thickness direction faces the inside of the box.

[0009] Two baffles are provided, which are located at opposite ends of the crossbeam body along its length. A channel is provided on the side of the baffle away from the crossbeam body, and the channel runs through the baffle along the thickness direction of the crossbeam body.

[0010] In the technical solution, reinforcing ribs are set inside the cavity of the crossbeam body to increase the overall strength of the crossbeam body and avoid the crossbeam body's overall strength being reduced due to the setting of the cavity; by setting the baffle with the channel and making the channel pass through the baffle along the thickness direction of the crossbeam body, the channel can connect both sides of the thickness direction of the crossbeam body, so that the airflow can pass through the thickness direction of the crossbeam body, thereby balancing the air pressure inside and outside the low temperature storage box and avoiding the phenomenon that the door is difficult to open under the action of pressure difference.

[0011] In some embodiments, one side of the baffle along the thickness direction of the beam body is flush with the side of the beam body that contacts the door, and the other side of the baffle along the thickness direction of the beam body extends into the box body beyond the beam body.

[0012] In the technical solution, the baffle is extended into the box body beyond the crossbeam body so that the baffle extends into the box body, thereby allowing the channel to extend into the box body, which facilitates the flow of air into the box body and balances the air pressure inside and outside the box body.

[0013] In some embodiments, the baffle has an insertion part on the side facing the crossbeam body, which is inserted into the through cavity to connect the baffle to the crossbeam body.

[0014] In the technical solution, by setting an insertion part, the insertion part is inserted into the through cavity, which not only facilitates the connection between the baffle and the crossbeam body, but also increases the contact area between the baffle and the crossbeam body, thereby enhancing the connection effect between the two.

[0015] In some embodiments, a reinforcing rib protrudes from the inner wall of the cavity, and the reinforcing rib and the inner wall of the cavity together define a limiting groove. The limiting groove has at least a slot facing the baffle, and the insertion part is inserted into the limiting groove.

[0016] In the technical solution, the reinforcing rib and the inner wall of the cavity are used to form a limiting groove, and the insertion part is inserted into the limiting groove to increase the connection effect between the baffle and the crossbeam body.

[0017] In some embodiments, the insertion part extends circumferentially along the baffle, and the insertion part is provided with a notch to avoid the reinforcing rib; when the insertion part is inserted into the limiting slot, the reinforcing rib is located in the notch.

[0018] In the technical solution, by extending the insertion part along the circumference of the baffle, the size of the insertion part is increased, thereby increasing the connection effect between the baffle and the crossbeam body. By setting a notch in the insertion part, not only can the interference between the insertion part and the reinforcing rib be avoided, thus preventing the insertion part from being inserted into the limiting slot, but the connection position between the baffle and the crossbeam body can also be positioned by the cooperation between the reinforcing rib and the notch.

[0019] In some embodiments, four reinforcing ribs are provided, corresponding to the four corners of the crossbeam body; four notches are provided, corresponding one-to-one with the four reinforcing ribs.

[0020] In some embodiments, a reinforcing member is also included, which is disposed within the cavity and whose length direction is along the length direction of the beam body.

[0021] In some embodiments, the reinforcing member is attached to one side of the cavity wall, the outer side of the cavity wall is in contact with the door body, and the reinforcing member and the sealing strip on the door body are magnetically attracted to each other.

[0022] In the technical solution, a reinforcing member is installed inside the cavity so that it attracts the sealing strip, thereby increasing the tightness of the door closure.

[0023] In some embodiments, the beam body is made of polyvinyl chloride, and the reinforcing members are made of metal.

[0024] In addition, this application also provides a low-temperature storage box, comprising:

[0025] The box has an internally defined storage compartment; one side of the box has an opening that communicates with the storage compartment.

[0026] The aforementioned crossbeam is located at the opening, with its two ends along its length connected to the opposite sides of the opening.

[0027] The door is rotatably positioned at the opening to open or close the storage room; a sealing strip is provided on the side of the door facing the storage room, and the sealing strip contacts the side of the crossbeam body away from the storage room.

[0028] Based on the above technical solution, the crossbeam in this embodiment not only has high overall strength, but also allows airflow to pass through the crossbeam, realizing rapid gas exchange between the inside and outside of the box, and avoiding the phenomenon that the door of the low-temperature storage box is difficult to open under the action of air pressure difference. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a structural schematic diagram of one embodiment of the crossbeam of this application;

[0031] Figure 2 This is a cross-sectional view of one embodiment of the beam in this application;

[0032] Figure 3 This is an exploded view of the structure of one embodiment of the beam in this application;

[0033] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0034] Figure 5 for Figure 3 Enlarged view of section B in the middle.

[0035] In the picture:

[0036] 1. Crossbeam body; 2. Baffle; 3. Reinforcing component;

[0037] 101. Through cavity; 102. Limiting slot;

[0038] 11. Reinforcing ribs;

[0039] 21. Channel; 22. Insertion part; 23. Notch. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] As attached Figures 1-5 As shown in an illustrative embodiment of the crossbeam in this application, the crossbeam is applied in a low-temperature storage box. The crossbeam is located at the opening of the box, with one side of the crossbeam in the thickness direction facing the inside of the box and the other side of the crossbeam in the thickness direction facing away from the inside of the box. The side of the crossbeam facing away from the inside of the box contacts the door so that the door can close the inside of the box.

[0045] like Figures 1-3 As shown, the crossbeam includes a crossbeam body 1, and a through cavity 101 is provided inside the crossbeam body 1. The through cavity 101 extends along the length direction of the crossbeam body 1. A reinforcing rib 11 is provided inside the through cavity 101. The reinforcing rib 11 is arranged along the length direction of the crossbeam body 1 to increase the overall structural strength of the crossbeam body 1. One side of the crossbeam body 1 in the thickness direction is in contact with the door body, and the other side of the crossbeam body 1 in the thickness direction is arranged facing the inside of the box.

[0046] It should be noted that the length direction of the beam body 1 is the length direction of the beam, and the thickness direction of the beam body 1 is the thickness direction of the beam.

[0047] In some embodiments, the crossbeam body 1 has a square cylindrical structure.

[0048] The crossbeam body 1 is made of polyvinyl chloride. The crossbeam body 1 is made of PVC (polyvinyl chloride) in one piece by extrusion molding. Compared with sheet metal structure, polyvinyl chloride has higher mechanical strength, will not become brittle at lower temperatures, is cheaper, has higher production efficiency, and has a certain degree of elastic deformation, so it will not scratch the inner wall of the storage box.

[0049] The extrusion process stretches the PVC beam body 1 along the stress direction, giving the matrix excellent axial bending stiffness. In some embodiments, the axial bending stiffness of the beam body is ≥3.5 GPa.

[0050] like Figures 1-5As shown, the aforementioned crossbeam includes baffles 2, and two baffles 2 are provided, which are respectively located at both ends of the crossbeam body 1 along its length. A channel 21 is provided on the side of the baffle 2 away from the crossbeam body 1. The channel 21 is provided through the baffle 2 along the thickness direction of the crossbeam body 1 so that the channel 21 can connect both sides of the crossbeam body 1 in the thickness direction, thereby allowing airflow to pass through the thickness direction of the crossbeam body 1, thereby balancing the air pressure inside and outside the low-temperature storage box and preventing the door from being difficult to open under the action of pressure difference.

[0051] like Figure 2 As shown, one side of the baffle 2 along the thickness direction of the crossbeam body 1 is flush with the side of the crossbeam body 1 that contacts the door. The other side of the baffle 2 along the thickness direction of the crossbeam body 1 extends into the box body beyond the crossbeam body 1, so that the baffle 2 extends into the box body, thereby allowing the channel 21 to extend into the box body, which in turn facilitates the flow of air into the box body and balances the air pressure inside and outside the box body.

[0052] The duct 21 is optimized for fluid dynamics to achieve rapid pressure balance between the inside and outside of the enclosure before the door is opened, thus reducing user waiting time. In some embodiments, the pressure balance time is less than 3 minutes.

[0053] Because the time for the air pressure inside and outside the chamber to equalize is short, the loss of cold air inside the chamber due to opening the door is small. In some embodiments, the loss of cold air caused by a single door opening is controlled within 0.5℃, which is significantly better than the industry average loss level of 2℃.

[0054] In some embodiments, the channel 21 is not arranged in a straight line along the thickness direction of the beam body 1, but is a non-linear channel. The non-linear channel 21 can effectively block more than 99% of particulate pollutants in the outside air (compliant with ISO 14644 Class 5 standard) while accelerating gas exchange, thereby preventing the sample inside the chamber from being contaminated.

[0055] The baffle 2 and the crossbeam body 1 are assembled in an integrated snap-fit ​​manner to facilitate the connection between the baffle 2 and the crossbeam body 1 and improve the assembly efficiency of the baffle 2 and the crossbeam body 1.

[0056] Specifically, such as Figure 4 As shown, the baffle 2 has an insertion part 22 on the side facing the crossbeam body 1. The insertion part 22 is inserted into the through cavity 101 so that the baffle 2 is connected to the crossbeam body 1.

[0057] like Figure 5As shown, the reinforcing rib 11 protrudes from the inner wall of the cavity 101, and the reinforcing rib 11 and the inner wall of the cavity 101 together define a limiting groove 102. The limiting groove 102 has at least one opening facing the baffle 2 so that the insertion part 22 can be inserted into the limiting groove 102. By making the limiting groove 102 cooperate with the insertion part 22, the connection effect between the baffle 2 and the crossbeam body 1 is enhanced.

[0058] In some embodiments, such as Figure 2 and Figure 4 As shown, the insertion part 22 extends circumferentially along the baffle 2 to increase the size of the insertion part 22, thereby increasing the contact area between the baffle 2 and the crossbeam body 1, and further increasing the connection effect between the baffle 2 and the crossbeam body 1.

[0059] like Figure 4 As shown, the insertion part 22 is provided with a notch 23 to avoid the reinforcing rib 11; when the insertion part 22 is inserted into the limiting slot 102, the reinforcing rib 11 is provided in the notch 23, which can not only avoid the insertion part 22 and the reinforcing rib 11 from interfering with each other and affecting the insertion part 22 into the limiting slot 102, but also use the cooperation between the reinforcing rib 11 and the notch 23 to position the connection position between the baffle 2 and the crossbeam body 1.

[0060] In some embodiments, such as Figure 5 As shown, there are four reinforcing ribs 11, which correspond to the four corners of the beam body 1 to increase the overall strength of the beam body 1. Correspondingly, there are four notches 23, which correspond one-to-one with the four reinforcing ribs 11.

[0061] In some embodiments of this application, the baffle 2 and the crossbeam body 1 are made of the same plastic injection molding. The baffle 2 is also made of PVC material. The PVC extrusion process can achieve a material utilization rate of 98%, which reduces the manufacturing cost of a single piece by 44% (compared to sheet metal structure). The snap-fit ​​assembly design of the baffle 2 and the crossbeam body 1 can shorten the installation time to 18 seconds, which can improve the efficiency by 85% compared to the welding process.

[0062] When the crossbeam is used in medical refrigerators, medical equipment has mandatory standards for surface integrity (YY / T 0646). The PVC extruded crossbeam has a certain degree of elastic deformation, which can eliminate the risk of friction and scratches between the two ends of the crossbeam body 1 and the inner wall of the inner liner during installation and subsequent maintenance and replacement, and reduce the damage rate of the inner liner surface.

[0063] like Figure 3 As shown, the above-mentioned crossbeam also includes a reinforcing member 3, which is disposed in the cavity 101. The length direction of the reinforcing member 3 is arranged along the length direction of the crossbeam body 1 to increase the overall strength of the crossbeam body 1.

[0064] In some embodiments, the reinforcing member 3 is connected to the beam body 1 by an interference fit, and the two sides of the reinforcing member 3 extending along the length direction of the beam body 1 respectively contact the reinforcing rib 11.

[0065] like Figure 5 As shown, the reinforcing member 3 is attached to one side of the cavity wall of the cavity 101, and the outer side of the cavity wall is in contact with the door body. The reinforcing member 3 and the sealing strip on the door body are attracted by each other magnetically, thereby increasing the tightness of the door closure.

[0066] It should be noted that the outer side of one side wall of the crossbeam body 1 in the circumferential direction is in contact with the door body, and the inner side is in contact with the reinforcing member 3.

[0067] The reinforcing component 3 is made of metal. The metal reinforcing component 3 can not only cooperate with the magnetic sealing strip to form magnetic coupling, so that the low temperature storage box has good sealing performance and achieves adaptive adsorption at the moment of closing, but also increase the bending resistance and torsion resistance of the crossbeam body 1.

[0068] In some embodiments, the pressure fluctuation of the sealing strip is less than 5% under a door tensile force of 2000N, ensuring that the airtightness decay rate is less than 3% over a 10-year service life, improving stability by 10 times compared to traditional structures. Combined with the rapid air pressure balance characteristics, the overall cold air escape rate is reduced by 70%, which, based on an average of 20 openings per day, can reduce power consumption by over 800 kWh per year.

[0069] In some embodiments, the reinforcing member 3 has a U-shaped structure, with one end of the reinforcing member 3 along the thickness direction of the beam body 1 being a closed end and the other end of the reinforcing member 3 along the thickness direction of the beam body 1 being an open end, and the closed end of the reinforcing member 3 being in contact with the inner side of the side wall of the beam body 1 facing the door.

[0070] The crossbeam body 1, formed by extrusion molding of polyvinyl chloride (PVC), is combined with the built-in metal reinforcement 3 to form a rigid-flexible composite structure. The extrusion process causes the PVC crossbeam body 1 to stretch along the stress direction, giving the matrix excellent axial bending stiffness; the built-in metal reinforcement 3 further enhances the torsional resistance through an interference fit. In some embodiments, the torsional stiffness is ≥180 N·m / rad.

[0071] In some embodiments, after the reinforcing member 3 is assembled into the crossbeam body 1, it still retains more than 85% of its original strength in a low temperature environment of -25℃, and the permanent deformation is less than 0.15mm after 100,000 opening and closing cycles. Its comprehensive mechanical life is more than 3 times that of traditional sheet metal structures.

[0072] The aforementioned crossbeams, through integrated material innovation, structural optimization, and functional synergistic design, systematically solve the problems of door opening delay, cold loss, and pollution risks caused by the pressure difference between the inside and outside of the enclosure in existing technologies, as well as the problems of complex manufacturing processes, insufficient structural strength, and high maintenance costs of traditional sheet metal crossbeams.

[0073] Based on the aforementioned crossbeam, this application also provides a cryogenic storage box, which includes a box body, the aforementioned crossbeam, and a door. The box body defines a storage chamber inside. One side of the box body is provided with an opening communicating with the storage chamber. The crossbeam is located at the opening, and the two ends of the crossbeam in the length direction are correspondingly connected to the two opposite sides of the opening. The door is rotatably located at the opening for opening or closing the storage chamber. A sealing strip is provided on the side of the door facing the storage chamber, and the sealing strip contacts the side of the crossbeam body 1 away from the storage chamber.

[0074] It should be noted that the low-temperature storage box can be a medical refrigerator, or a refrigerator, freezer, etc.

[0075] In some embodiments, the opening on the housing is located on the front side of the housing, or it may be located on the top of the housing.

[0076] When the door of the aforementioned low-temperature storage box is opened, there is a gap between the two ends of the door and the crossbeam, which allows air from outside the box to flow into the box through the hole 21, thereby reducing the pressure difference between the inside and outside of the box. When the pressure inside and outside the box is balanced, the door can be opened with a smaller force.

[0077] In the aforementioned cryogenic storage box, the crossbeam not only has high overall strength, but also allows airflow to pass through it, enabling rapid gas exchange between the inside and outside of the box and preventing the door of the cryogenic storage box from being unable to open due to pressure difference.

[0078] Through the description of several embodiments of the crossbeam and the cryogenic storage box including the present application, it can be seen that the embodiments of the crossbeam and the cryogenic storage box including the present application have at least one or more of the following advantages:

[0079] 1. By setting baffles 2 with through holes 21 at both ends of the crossbeam body 1, and setting the holes 21 along the thickness direction of the crossbeam body 1, the air pressure inside and outside the box can be quickly balanced before the door is opened, avoiding the user from having to wait passively for a long time.

[0080] 2. A through cavity 101 is provided inside the beam body 1, and a metal reinforcing member 3 is placed inside the PVC beam body 1, forming a rigid-flexible composite combination between the beam body 1 and the reinforcing member 3. This not only increases the axial bending stiffness of the combination but also enhances its torsional resistance. Through the superposition effect of material stiffness, the overall structural stability of the beam is significantly improved. Furthermore, the embedded metal reinforcing member 3 forms a highly efficient magnetic coupling interface with the magnetic sealing strip, enabling adaptive adsorption at the moment of closing and increasing the airtightness of the door when closed.

[0081] 3. Setting a through cavity 101 inside the crossbeam body 1 will reduce the overall strength of the crossbeam body 1. By setting a reinforcing rib 11 on the cavity wall of the through cavity 101, the strength loss of the crossbeam body 1 due to the setting of the through cavity 101 can be compensated. The reinforcing rib 11 and the inner wall of the through cavity 101 form a limiting groove 102. The insertion part 22 cooperates with the limiting groove 102 to realize the snap-fit ​​assembly of the baffle 2 and the crossbeam body 1.

[0082] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0083] The above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A crossbeam, characterized in that, include: The crossbeam body has a through cavity inside, which extends along the length of the crossbeam body; the through cavity has reinforcing ribs, which are arranged along the length of the crossbeam body; one side of the crossbeam body in the thickness direction contacts the door body, and the other side of the crossbeam body in the thickness direction faces the inside of the box body. Two baffles are provided, which are respectively located at both ends of the crossbeam body along its length. The baffles have a channel on the side away from the crossbeam body, and the channel extends through the baffle along the thickness direction of the crossbeam body.

2. The crossbeam according to claim 1, characterized in that, One side of the baffle, which is arranged along the thickness direction of the crossbeam body, is flush with the side of the crossbeam body that contacts the door body, and the other side of the baffle, which is arranged along the thickness direction of the crossbeam body, extends into the box body beyond the crossbeam body.

3. The crossbeam according to claim 1, characterized in that, The baffle has an insertion part on the side facing the crossbeam body, and the insertion part is inserted into the through cavity so that the baffle is connected to the crossbeam body.

4. The crossbeam according to claim 3, characterized in that, The reinforcing rib protrudes from the inner wall of the cavity, and the reinforcing rib and the inner wall of the cavity together define a limiting groove. The limiting groove has at least one opening facing the baffle, and the insertion part is inserted into the limiting groove.

5. The crossbeam according to claim 4, characterized in that, The insertion part extends circumferentially along the baffle, and the insertion part has a notch to avoid the reinforcing rib; when the insertion part is inserted into the limiting slot, the reinforcing rib is located in the notch.

6. The crossbeam according to claim 5, characterized in that, The reinforcing ribs are configured as four, and the four reinforcing ribs are configured to correspond to the four corners of the crossbeam body; the notches are configured as four, and the four notches are configured to correspond one-to-one with the four reinforcing ribs.

7. The crossbeam according to claim 1, characterized in that, It also includes a reinforcing member, which is disposed in the cavity and whose length direction is along the length direction of the beam body.

8. The crossbeam according to claim 1, characterized in that, The reinforcing member is attached to one side of the cavity wall of the passage, and the outer side of the cavity wall is in contact with the door body. The reinforcing member and the sealing strip on the door body are magnetically attracted to each other.

9. The crossbeam according to claim 1, characterized in that, The crossbeam body is made of polyvinyl chloride, and the reinforcing member is made of metal.

10. A low-temperature storage box, characterized in that, include: The box has an internally defined storage compartment; one side of the box has an opening communicating with the storage compartment. The crossbeam according to any one of claims 1 to 9, wherein the crossbeam is disposed at the opening, and the two ends of the crossbeam in the length direction are correspondingly connected to the opposite sides of the opening; A door is rotatably disposed at the opening for opening or closing the storage room; a sealing strip is provided on the side of the door facing the storage room, and the sealing strip contacts the side of the crossbeam body opposite to the storage room.

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