Heat exchanger base and low-temperature preservation box comprising same

Abstract

The utility model discloses a heat exchanger base and a low-temperature preservation box comprising the same, and belongs to the technical field of refrigeration equipment. The heat exchanger base comprises two symmetrically-distributed support assemblies, and each support assembly comprises a bearing beam and a connecting base. Mounting holes are formed in the two ends of the bearing beam in the length direction, and the bearing beam is used for supporting the heat exchanger coil. The connecting seats are in a long strip shape, one ends of the two connecting seats are arranged at the two ends of the bearing beam in the length direction, the two connecting seats are perpendicular to the bearing beam, and the other ends of the two connecting seats are connected with the inner container assembly. According to the heat exchanger base and the low-temperature storage box comprising the heat exchanger base, integrated installation of a heat exchanger fixing structure and a refrigerating system is achieved through topological optimization design, the system stability is effectively improved, and the assembling complexity is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to refrigeration equipment technical field especially relates to a heat exchanger base and contain its low temperature preservation box. BACKGROUND

[0002] In order to realize rapid cooling and accurate temperature control, the low temperature preservation box is usually configured with a plane coil type heat exchanger at the bottom of the box body, which adopts a concentric circle topology structure, and the coil is distributed in multiple concentric circles on the same horizontal plane to realize the heat exchange characteristics of large specific surface area with compact space layout.

[0003] In the prior art, a three-point or multi-point fixing scheme is generally used, which is completed by setting positioning points equidistantly on the circumference of the heat exchanger coil, and cooperating with a combined buckle device (a combined structure of a metal hook and an injection molded base) composed of an anchoring end at the bottom of the box shell and a positioning end of the heat exchanger.

[0004] However, through actual verification, the above fixing scheme has many technical defects in engineering application. In terms of system integration, the heat exchange pipeline and the evaporation pipeline belong to two independent components of the box shell and the inner container respectively, and need to be installed respectively during final assembly. Moreover, because the pipeline system leak detection process needs to be completed before the box body foaming process, the existing structure cannot perform overall air tightness detection on the two pipeline systems before nesting the inner container, which has a system level leakage risk, may cause irreversible pipeline connection hidden danger, and has a safety performance defect, and the refrigerant leakage may cause system instability and even explosion accident. In terms of assembly process, the precise distance between the inner container and the preassembled heat exchanger needs to be maintained during nesting assembly, which increases the assembly difficulty; the foaming interlayer space is narrow, and the pipeline arrangement and welding operation accessibility is poor; the process tolerance rate is low, and the skill level of the operator is required. SUMMARY

[0005] In view of the deficiencies in the related art, the utility model aims to provide a heat exchanger base and a low temperature preservation box containing the same to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A heat exchanger base comprises two symmetrically distributed support assemblies, each support assembly comprising:

[0008] A bearing beam, the two ends of the bearing beam in the length direction are provided with mounting holes, and the bearing beam is used to support the heat exchanger coil;

[0009] The connecting seat is long strip-shaped, two connecting seats are arranged, one end of the two connecting seats is arranged at the two ends of the length direction of the bearing beam, the two connecting seats are arranged perpendicularly to the bearing beam, and the other end of the two connecting seats is connected to the inner container assembly.

[0010] In some embodiments, the connecting seat is provided with a first reinforcing plate integrally formed with the connecting seat, so that the cross section of the connecting seat is a special-shaped cross section.

[0011] In some embodiments, the heat exchanger base further comprises a reinforcing column arranged at the corner of the special-shaped cross section.

[0012] In some embodiments, the reinforcing column is provided with a through hole, and the through hole of the reinforcing column is connected with the mounting hole of the bearing beam.

[0013] In some embodiments, the bearing beam is provided with a weight-reducing hole along the length direction of the bearing beam.

[0014] In some embodiments, a plurality of weight-reducing holes are equidistantly arranged along the length direction of the bearing beam.

[0015] In some embodiments, the bearing beam is provided with a second reinforcing plate integrally formed with the bearing beam, so that the cross section of the bearing beam is a special-shaped cross section.

[0016] In some embodiments, the connecting seat is made of glass fiber reinforced plastic material.

[0017] A low-temperature preservation box comprises an inner container assembly arranged in the low-temperature preservation box, an evaporation pipeline arranged around the inner container assembly, and a heat exchanger coil arranged at the bottom of the inner container assembly, and further comprises the heat exchanger base described above; wherein the bottom of the inner container assembly is provided with a pre-set hole, the pre-set hole is connected with the through hole of the reinforcing column, and the heat exchanger coil is arranged on the bearing beam of the heat exchanger base.

[0018] Compared with the prior art, the heat exchanger base has the following beneficial effects:

[0019] 1. The heat exchanger base comprises two symmetrically distributed support assemblies, each support assembly comprises a bearing beam and a connecting seat, the structure is simple, the heat exchanger is fixed by innovatively cooperating with the inner container assembly, the heat exchange pipeline system and the evaporation pipeline system are combined into one whole, the overall mass spectrum detection of the heat exchange-evaporation pipeline can be completed before foaming, and the product stability is enhanced.

[0020] 2. The heat exchanger base and the low-temperature preservation box comprising the same have the following beneficial effects: the connecting seat is integrally formed with a first reinforcing plate and forms a special-shaped cross section, the structural strength and stability are greatly enhanced, the connecting gap is reduced by integrally forming, the weak point is avoided, the mechanical properties are optimized by the special-shaped cross section, the complex external force can be better borne, in actual application, the connecting seat can be effectively prevented from being deformed and damaged, the service life is prolonged, and the reliable operation of the whole equipment is ensured.

[0021] 3. The heat exchanger base and the low-temperature preservation box comprising the same provided by the utility model have the advantages that the heat exchanger coil and the inner container assembly are designed as an integrated structure through the heat exchanger base, the assembly space is restructured, the operation space required in the inner container nesting stage is greatly reduced, the process fault tolerance is remarkably improved, the requirement for the technical level of workers is reduced, the installation process becomes convenient and simple, the production efficiency is improved, and the continuity of the production process is further enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are included to provide a further understanding of the utility model, form a part of the application and are incorporated herein to illustrate the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0023] Figure 1 It is a structure schematic view of one embodiment of the heat exchanger base and the low-temperature preservation box comprising the same of the utility model;

[0024] Figure 2 It is a support assembly structure schematic view of one embodiment of the heat exchanger base and the low-temperature preservation box comprising the same of the utility model;

[0025] Figure 3 It is a bearing beam structure schematic view of one embodiment of the heat exchanger base and the low-temperature preservation box comprising the same of the utility model;

[0026] Figure 4 It is a connecting seat structure schematic view of one embodiment of the heat exchanger base and the low-temperature preservation box comprising the same of the utility model;

[0027] Figure 5 It is Figure 1 It is an explosion schematic view of the connecting relationship of the A part.

[0028] In the drawings:

[0029] 1, support assembly; 11, bearing beam; 111, mounting hole; 112, weight-reducing hole; 113, second reinforcing plate; 12, connecting seat; 121, first reinforcing plate; 13, reinforcing column; 131, through hole; 2, heat exchanger coil; 3, inner container assembly; 31, preset hole; 4, first connecting piece; 5, second connecting piece. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0032] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0033] Embodiment 1:

[0034] Referring to the drawings Figures 1 to 5 A schematic embodiment of the heat exchanger base is given, which comprises two symmetrically distributed support assembly 1, each support assembly 1 is composed of a bearing beam 11 and a connecting seat 12.

[0035] The two ends of the length direction of the bearing beam 11 are provided with mounting holes 111, and the bearing beam 11 is used to support the heat exchanger coil 2, so that the heat exchanger coil 2 is reliably supported, the stability in the working process is guaranteed, and the normal heat exchange is facilitated. In this embodiment, the long axis direction of the bearing beam 11 is parallel to the width direction of the inner container assembly 3, and this arrangement can better adapt to the space layout inside the low-temperature preservation box, facilitate reasonable arrangement of other components around the bearing beam 11, and improve the space utilization.

[0036] The connecting seat 12 is in the shape of a long strip, two connecting seats 12 are arranged, one end of the two connecting seats 12 is arranged at the two ends of the length direction of the bearing beam 11, the two connecting seats 12 are arranged perpendicularly to the bearing beam 11, and the other end of the two connecting seats 12 is connected to the inner container assembly 3. The long strip-shaped connecting seat 12 can effectively connect and transition between the bearing beam 11 and the inner container assembly 3, reliably connect the bearing beam 11 and the inner container assembly 3, form a stable whole, and enhance the stability and reliability of the structure.

[0037] The connecting seat 12 has a first reinforcing plate 121 integrally formed therewith, so that the cross section of the connecting seat 12 is a special-shaped cross section. The special-shaped cross section can be a few-shaped cross section, a Z-shaped cross section, or other shapes. In the embodiment, two first reinforcing plates 121 are arranged on both sides of the connecting seat 12 in the width direction, and the special-shaped cross section of the connecting seat 12 is a U-shaped cross section. The connecting seat 12 with the U-shaped cross section has good structural strength and rigidity, can withstand large external forces and loads, and can effectively disperse stress and improve the stability and durability of the connecting part when connecting the load-bearing beam 11 and the inner container assembly 3.

[0038] The heat exchanger base further comprises a reinforcing column 13 arranged at the corner of the special-shaped cross section. Specifically, the reinforcing column 13 is a square column. In the embodiment, when the special-shaped cross section is a U-shaped cross section, the reinforcing column 13 is arranged at the corner of the U-shaped cross section, which can further enhance the structural strength and stability of the connecting seat 12, especially at the stress concentration part of the corner, effectively preventing the connecting seat 12 from deforming or being damaged, and improving the reliability of the entire heat exchanger base.

[0039] The reinforcing column 13 is provided with a through hole 131, and specifically, the through hole 131 is arranged at the center of the reinforcing column 13. The through hole 131 of the reinforcing column 13 is connected with the mounting hole 111 of the load-bearing beam 11, and the connection mode can be selected from welding, hot melt glue fixing, or mortise and tenon structure, etc. In the embodiment, the through hole 131 and the mounting hole 111 are connected by the first connecting piece 4. The arrangement and cooperation of the through hole 131 and the mounting hole 111 enable the reinforcing column 13 to be firmly connected with the load-bearing beam 11, further enhancing the connection strength and stability between the load-bearing beam 11 and the connecting seat 12, and making the entire structure more stable.

[0040] In some embodiments, the first connecting piece 4 can be a stainless steel self-tapping screw. The stainless steel self-tapping screw has good corrosion resistance and high strength, and the use of the stainless steel self-tapping screw as the connecting piece can ensure the firmness and durability of the connection, reduce the problem of structural looseness caused by corrosion or damage of the connecting piece, and prolong the service life of the equipment.

[0041] The load-bearing beam 11 is provided with a weight-reducing hole 112 along the length direction. The arrangement of the weight-reducing hole 112 can reduce the weight of the load-bearing beam 11, reduce the weight of the entire equipment without affecting the main load-bearing capacity and structural strength of the load-bearing beam 11, and is also conducive to the installation and transportation of the equipment.

[0042] The hole diameter and hole distance of the weight reduction hole 112 are reasonably set, so that the structural strength and stability of the bearing beam 11 can be ensured while achieving good weight reduction effect, and the bearing capacity of the bearing beam 11 can be avoided to be reduced due to the excessively large or dense holes. In the embodiment, a plurality of weight reduction holes 112 are equidistantly arranged along the length direction of the bearing beam 11, and the hole distance between the weight reduction holes 112 can be set with a reasonable tolerance to ensure that the hole distance is within a reasonable range, so that the structural strength is not significantly weakened due to too many or too large weight reduction holes 112, and the bearing capacity is ensured.

[0043] The bearing beam 11 has a second reinforcing plate 113 integrally formed therewith, so that the cross section of the bearing beam 11 is a special-shaped cross section. The special-shaped cross section can be a U-shaped cross section, a Z-shaped cross section or other shapes. In the embodiment, two second reinforcing plates 113 are arranged on both sides of the bearing beam 11 in the width direction, and the special-shaped cross section of the bearing beam 11 is a U-shaped cross section. In the embodiment, the bearing beam 11 can be selected as a U-shaped cross section cold-rolled steel strip. The bearing beam 11 adopts the U-shaped cross section cold-rolled steel strip, which can greatly strengthen the structural strength, uniformly disperse the load, effectively improve the stability of the heat exchanger base, and better support the heat exchanger coil 2. In addition, the U-shaped cross section cold-rolled steel strip is convenient to process and install, can optimize the space utilization, is conducive to heat dissipation, and has reasonable cost, corrosion resistance and wear resistance after surface treatment, and takes into account economy and durability.

[0044] The material of the connecting seat 12 can be selected from metal, plastic or wood, etc. In the embodiment, the connecting seat 12 is made of glass fiber reinforced plastic material. The glass fiber reinforced plastic has the advantages of high strength, high modulus, good corrosion resistance and low weight, etc. The connecting seat 12 made of the material can reduce the weight of the connecting seat 12 while ensuring the structural strength and stability of the connecting seat 12, reduce the cost, and the corrosion resistance is conducive to prolonging the service life of the connecting seat 12. The connecting seat 12 is made by extrusion molding process, realizes continuous extrusion production, the linear speed reaches 12 m / min, the mold complexity coefficient is reduced from 0.78 to 0.35 (compared with traditional injection molding process), the manufacturing cost is reduced by 40-45%, and the material utilization rate is increased to 98.2%. In terms of maintenance cost, the components can be replaced individually, the average repair time (MTTR) is reduced from 8 hours to 0.5 hours, and the salt spray test verifies that there is no failure for 3000 hours, and there is no risk of metal-plastic composite stress corrosion.

[0045] When the connecting seat 12 is selected as a plastic material, the structural strength can be ensured while having good heat insulation effect, so as to insulate the heat conduction between the heat exchanger coil 2 and the inner container assembly 3, so that the temperature in the low-temperature preservation box can be kept stable during operation, and the energy consumption of the low-temperature preservation box is reduced.

[0046] In the above exemplary embodiment, the heat exchanger base is based on the inner container assembly and the bracket assembly integrated architecture, which realizes significant improvement of system level reliability. Through pre-integrated heat exchanger coil and evaporation pipeline, the system integration degree is greatly improved from 0.65 of the split type to 1.2 of the integrated coefficient, and the improvement range is 83%. At the same time, the mass spectrum leak detection window period is moved in advance, and 10 -6 Pa·m 3 / s level full system detection, and after 1000 hours of accelerated aging test verification, the leakage failure rate is reduced by 92%, and the pipeline stress concentration phenomenon caused by split installation is also eliminated, and the peak stress is reduced from 215MPa to 127MPa.

[0047] The assembly and working process of an embodiment of the heat exchanger base of the utility model will be described below in combination with the accompanying drawings. Figures 1 to 5 The assembly and working process of an embodiment of the heat exchanger base of the utility model will be described below in combination with the accompanying drawings.

[0048] During assembly, first, connect the connecting seat 12 to the preset hole 31 at the bottom of the inner container assembly 3 through stainless steel self-tapping nails to realize radial positioning; then, align the mounting hole 111 of the bearing beam 11 with the through hole 131 of the reinforcing column 13 of the connecting seat 12, and use stainless steel self-tapping nails to complete the rigid connection of the bracket assembly 1 and the inner container assembly 3; finally, hoist and position the heat exchanger coil 2, which automatically falls into the bearing beam 11 under the action of gravity. During the working process, the static load transmission is: heat exchanger coil 2 self-weight→ bearing beam 11 bending stress→ connecting seat 12 shear stress→ inner container assembly 3 structure bearing. Dynamic stress elimination is provided by the U-shaped section to provide torsional stiffness (sectional moment of inertia ≥450mm 4 ), and the weight reduction hole 112 reduces the mass vibration effect. For thermal expansion compensation, a 0.5-1mm assembly gap is provided at the metal / plastic heterogeneous material connection to absorb ±0.3mm thermal deformation.

[0049] Embodiment 2:

[0050] This embodiment gives an exemplary embodiment of the heat exchanger base proposed by the utility model, and the difference between this embodiment and embodiment 1 is:

[0051] The bearing beam 11 and the connecting seat 12 are integrally formed into the bracket assembly 1 by using the same material, and the bracket assembly 1 can be hung at the bottom of the inner container assembly 3 through welding, rivet fixing, hot melt glue or clamping groove structure and the like, so as to fix the heat exchanger coil 2.

[0052] In the above exemplary embodiment, the integrally formed support assembly eliminates the gaps and weak points that may exist at the connection sites, is more continuous and complete in structure, can better withstand various stresses and external forces, and improves the overall structural strength and stability of the support assembly. Integrally forming reduces the complex process of manufacturing multiple parts separately and then connecting them, shortens the manufacturing process, and improves production efficiency. Integrally forming of the same material makes the mechanical properties of the material more uniform and consistent throughout the support assembly, eliminating the mechanical property differences that may be caused by the connection of different materials or connection processes, making the mechanical response of the support assembly more stable and predictable when bearing load, and improving its reliability and safety in actual application.

[0053] Embodiment 3:

[0054] The present embodiment provides a low-temperature preservation box comprising the heat exchanger base of embodiment 1.

[0055] The low-temperature preservation box comprises an inner container assembly 3 arranged inside the low-temperature preservation box, an evaporation pipeline arranged around the inner container assembly 3, and a heat exchanger coil 2 located at the bottom of the inner container assembly 3. In the present embodiment, a heat exchanger base is further included. The bottom of the inner container assembly 3 is provided with a pre-set hole 31, which is connected with the through hole 131 of the reinforcing column 13 in a manner that can be selected from welding, hot melt glue fixing, or mortise and tenon structure, etc. In the present embodiment, the pre-set hole 31 is connected with the through hole 131 through a second connecting piece 5. The second connecting piece 5 can adopt a stainless steel self-tapping screw as a connecting piece to ensure the firmness and durability of the connection. The heat exchanger coil 2 is placed on the load-bearing beam 11 of the heat exchanger base. Specifically, the heat exchanger coil 2 is placed on the load-bearing beam 11 in a surface contact manner, and the contact area of the surface contact is large, which makes the placement of the heat exchanger coil 2 on the load-bearing beam 11 more stable, reduces the risk of displacement caused by factors such as vibration, thermal expansion and contraction, and ensures that it maintains the correct position during operation, which is conducive to the stable operation of the low-temperature preservation box.

[0056] In the above exemplary embodiment, the low-temperature preservation box is innovated in terms of assembly process. The heat exchanger coil 2 is fixed at the bottom of the inner container assembly 3 through the heat exchanger base, and a modular screw connection scheme is adopted. The operation space requirement is reduced by 40%, the operation space requirement for the inner container is optimized from 120mm to 70mm, the process fault tolerance is improved by 3 levels, reaching the ISO9001 process stability Class B standard, the traditional brazing process is cancelled, the material strength decay caused by the heat affected zone (HAZ) is avoided, the assembly efficiency is improved by 65%, the single station working time is reduced from 45 minutes to 15 minutes, and only G3 level assembly qualification is required for operation.

[0057] 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.

[0058] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model 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 utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A heat exchanger base, characterized by, The heat exchanger base comprises two symmetrically distributed support assemblies, each of which comprises: a load-bearing beam, which is provided with mounting holes at both ends in the length direction and is used to support heat exchanger coils; two connection seats, which are in the shape of long strips, are provided at both ends of the load-bearing beam in the length direction, are arranged perpendicularly to the load-bearing beam, and are connected to the inner container assembly at the other ends.

2. The heat exchanger base of claim 1, wherein The connection seat has a first reinforcing plate integrally formed therewith, so that the cross section of the connection seat is a special-shaped cross section.

3. The heat exchanger base of claim 2, wherein, A reinforcing column is further arranged at the corner of the special-shaped cross section.

4. The heat exchanger base of claim 3, wherein, The reinforcing column is provided with a through hole, which is connected to the mounting hole of the load-bearing beam.

5. The heat exchanger base of claim 1, wherein The load-bearing beam is provided with weight-reducing holes at intervals along the length direction.

6. The heat exchanger base of claim 5, wherein, A plurality of weight-reducing holes are provided at intervals along the length direction of the load-bearing beam.

7. The heat exchanger base of claim 1, wherein The load-bearing beam has a second reinforcing plate integrally formed therewith, so that the cross section of the load-bearing beam is a special-shaped cross section.

8. The heat exchanger base of claim 1, wherein, The connection seat is made of glass fiber reinforced plastic.

9. A cryopreservation tank characterized by, The heat exchanger base comprises an inner container assembly arranged inside a low-temperature storage box, an evaporation pipeline arranged around the inner container assembly, and a heat exchanger coil arranged at the bottom of the inner container assembly, and further comprises the heat exchanger base according to any one of claims 4-8; wherein the bottom of the inner container assembly is provided with a pre-set hole, the pre-set hole is connected to the through hole of the reinforcing column, and the heat exchanger coil is placed on the load-bearing beam of the heat exchanger base.

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