A plate for a freeze dryer

Abstract

The utility model provides a kind of plate layer for freeze dryer, including the plate layer main body that by multiple stainless steel square tubes is combined and is formed by butt welding according to different specification plate layer width requirement homeward combination, the plate layer main body both ends are equipped with the plugging structure that is formed by plugging after cutting appropriate size by same specification square tube;Same material stainless steel baffle is fixed in the plugging structure, for changing the flow direction of heat conducting oil in plate layer, so that heat conducting oil forms serpentine flow;The utility model uses the way of tailor-made section assembly butt welding, without the complex steps of traditional plug welding form;By forming plate layer main body by combining and butt welding stainless steel square tubes according to different specification plate layer width requirement homeward combination, two ends are plugged after cutting appropriate size by same specification square tube, and stainless steel baffle is fixed in the plugging structure to change the flow direction of heat conducting oil;This design greatly simplifies the structure of plate layer, reduces the number of parts and welding procedure, so that plate layer weight is significantly reduced.

Description

Technical Field

[0001] This utility model relates to the field of freeze dryers, and in particular to a plate layer for freeze dryers. Background Technology

[0002] A freeze dryer, also known as a vacuum freeze dryer, is a device that freezes water-containing materials into a solid state at low temperatures, and then sublimates the water directly into water vapor under a high vacuum environment, which is then discharged from the body. It has wide applications in many fields such as food, medicine, and biological products. In the food industry, freeze drying technology can preserve the nutrients, flavor, and color of ingredients, and extend shelf life. In the pharmaceutical field, it is used to prepare vaccines, blood products, antibiotics, and other drugs, maintaining the stability of the active ingredients. In the field of biological products, it can be used to preserve cell and tissue samples.

[0003] The freeze-drying process mainly relies on heat transfer to achieve the sublimation of water. Typically, freeze dryers use a heat-conducting medium to transfer heat to the plates on which the material is placed. Through contact between the plates and the material, the water in the material is heated and sublimated. Therefore, the performance of the plates, as a key component for heat transfer, directly affects the freeze-drying effect and efficiency. Thus, there is an urgent need for an ideal plate with good thermal conductivity, uniform temperature distribution, high strength, and corrosion resistance to ensure stable operation during long-term freeze-drying processes. Utility Model Content

[0004] To address the problem of poor heat transfer efficiency in existing plate layers, this invention provides a plate layer for a freeze dryer.

[0005] The plate layer for a freeze dryer provided by this utility model adopts the following technical solution:

[0006] A plate for a freeze dryer includes a plate body composed of multiple stainless steel square tubes assembled and welded in the same direction according to different specifications of plate width requirements. The plate body has sealing structures at both ends formed by cutting square tubes of the same specification to appropriate sizes and sealing them. Stainless steel baffles of the same material are fixed inside the sealing structures to change the flow direction of heat transfer oil in the plate, so that the heat transfer oil forms a serpentine flow.

[0007] Furthermore, the stainless steel square tube is a straight, equal-length tube, the sealing structure is a square tube sealed on both sides and welded to both ends of the stainless steel square tube, and the stainless steel baffle is welded equidistantly inside the sealing structure, forming a serpentine heat transfer oil flow channel with the stainless steel square tube, so that the heat transfer oil flows in a serpentine manner.

[0008] Furthermore, the two ends of the stainless steel square tube are 45-degree oblique cuts, and the sealing structure is an isosceles triangle structure, which is welded to the oblique cut and connected to the stainless steel square tube to form a serpentine heat transfer oil flow channel, so that the heat transfer oil flows in a serpentine manner.

[0009] Furthermore, the stainless steel square tube is made of 304 or 316L stainless steel; adjacent square tubes are connected by a double-sided continuous welding method of composite welding or plasma welding to form a weld structure, and the weld structure adopts wire welding, the weld thickness is ≥1mm, and the weld height and width are equal.

[0010] Furthermore, the composite welding of the weld structure is a composite welding of laser and submerged arc, and the weld structure is formed on both sides of the plate structure simultaneously.

[0011] Furthermore, the main body of the plate layer undergoes shaping treatment after welding to meet the flatness requirements, the weld structure undergoes grinding treatment, and the height of the weld structure is flush with the surface of the main body of the plate layer.

[0012] Furthermore, the surface of the main body of the plate layer is polished, and the surface roughness is ≤Ra1.6μm.

[0013] In summary, the beneficial effects of this utility model are as follows:

[0014] This invention employs a customized profile assembly and welding method, eliminating the complex steps of traditional plug welding. The main body of the heat transfer oil layer is formed by welding stainless steel square tubes in the same direction according to different specifications and plate width requirements. Both ends are sealed with appropriately sized square tubes of the same specification, and stainless steel baffles are fixed inside the sealing structure to change the flow direction of the heat transfer oil. This design greatly simplifies the plate structure, reduces the number of parts and welding processes, and significantly reduces the weight of the plate. The simple structure not only facilitates installation and maintenance but also reduces production costs and improves equipment operating efficiency.

[0015] Furthermore, adjacent square tubes are joined using a double-sided continuous welding method, such as composite welding or plasma welding, or laser and submerged arc welding. Simultaneously, the weld structure forms on both sides of the plate structure, resulting in a more uniform distribution of welding stress. After welding, the main plate is shaped to meet flatness requirements, and the weld is then ground to ensure its height is flush with the surface of the main plate. These measures effectively control welding deformation, guarantee the flatness and dimensional accuracy of the plate, and improve the fit between the plate and other components, as well as the equipment's sealing performance.

[0016] Compared to high-requirement welding processes such as vacuum brazing and resistance welding, the composite welding or plasma welding process adopted in this solution significantly reduces the requirements for welding equipment. At the same time, the simplified process and reasonable welding parameter settings make the operation easier to master, reduce the occurrence of welding defects, and greatly improve the yield rate. This not only reduces the equipment investment cost of enterprises, but also improves production efficiency and product quality stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the first embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the internal structure of the second embodiment of the present invention;

[0021] Figure 5 This utility model Figure 1 An enlarged schematic diagram of part A in the middle.

[0022] As shown in the figure: 1-Stainless steel square tube, 2-Sealing structure, 3-Stainless steel baffle, 4-Welded structure. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1-5 The present invention will be further described in detail below:

[0024] This utility model discloses a plate layer for a freeze dryer, such as... Figure 1-5As shown, a freeze dryer plate includes a plate body composed of multiple stainless steel square tubes 1 welded together in the same direction according to different plate width requirements. The plate body has sealing structures 2 at both ends, formed by cutting square tubes of the same specification to appropriate sizes and then sealing them. Stainless steel baffles 3 of the same material are fixed inside the sealing structures 2 to change the flow direction of the heat transfer oil within the plate, causing the heat transfer oil to flow in a serpentine pattern. In this embodiment, the plate body of the freeze dryer plate is welded together in the same direction by multiple stainless steel square tubes 1 according to different plate width requirements, which is based on the principle of modular and combined design. Combining different numbers of stainless steel square tubes 1 can meet the needs of different widths, providing flexibility and versatility. The sealing structures 2 at both ends are formed by cutting square tubes of the same specification to an appropriate size and sealing them, with stainless steel baffles 3 fixed inside. When the heat transfer oil enters the plate layer, the stainless steel baffles 3 will block the direct flow of the heat transfer oil and guide it to change direction, thereby forming a serpentine flow path for the heat transfer oil within the plate layer. The serpentine flow of the heat transfer oil increases its flow path and contact area with the plate layer, enabling it to transfer heat to the plate layer more fully, improving heat transfer efficiency, and making the plate layer temperature more uniform, which is beneficial for the uniform heating of materials during the freeze-drying process. The design of combining stainless steel square tubes 1 and sealing structures 2 is relatively simple, easy to manufacture and assemble, and the size of the plate layer can be adjusted according to different usage requirements.

[0025] like Figure 1-5 As shown, the stainless steel square tube is a straight, equal-length tube, and the sealing structure 2 is a square tube sealed on both sides and welded to both ends of the stainless steel square tube 1. The stainless steel baffles 3 are welded at equal intervals inside the sealing structure 2, forming a serpentine flow channel for the heat transfer oil in conjunction with the stainless steel square tube 1, allowing the heat transfer oil to flow in a serpentine manner. In this embodiment, the stainless steel square tube is a straight, equal-length tube, the sealing structure 2 is sealed on both sides and welded to both ends of the stainless steel square tube 1, and the stainless steel baffles 3 are welded at equal intervals inside the sealing structure 2. This design allows the heat transfer oil to flow along a fixed path within the plate layer. The adjacent stainless steel square tubes 1 and the baffles inside the sealing structure 2 together form a continuous serpentine flow channel, ensuring the regularity and stability of the heat transfer oil flow.

[0026] like Figure 1-5As shown, the stainless steel square tube 1 has 45-degree beveled ends, and the sealing structure 2 is an isosceles triangle structure, which is welded to the stainless steel square tube 1 at the beveled ends to form a serpentine flow channel for the heat transfer oil, allowing the heat transfer oil to flow in a serpentine manner. The stainless steel square tube 1 has 45-degree beveled ends, and the sealing structure 2 is an isosceles triangle structure welded to the beveled ends. In this embodiment, the 45-degree beveled design is the second implementation method, which makes the connection between the sealing structure 2 and the stainless steel square tube 1 tighter, forming a smooth transition and reducing the resistance to the flow of heat transfer oil. The isosceles triangle sealing structure 2, in conjunction with the beveled ends, can also guide the heat transfer oil to flow in a serpentine manner, and this structure makes it easier to ensure sealing during welding.

[0027] In the above embodiments, whether it is a straight equal-length tube with conventional sealing structure 2 or a 45-degree oblique cut with isosceles triangular sealing structure 2, both can effectively guide the heat transfer oil to form a serpentine flow, so that the heat transfer oil flows smoothly in the plate and reduces energy loss during the flow process; the design of both structures is conducive to ensuring the sealing of the plate, preventing heat transfer oil leakage, and improving the reliability and service life of the plate.

[0028] Furthermore, the stainless steel square tube 1 is made of 304 or 316L stainless steel; adjacent square tubes are connected by double-sided continuous welding using composite welding or plasma welding to form a weld structure 4, and the weld structure 4 uses wire welding, resulting in a weld thickness ≥1mm, with equal weld height and width; in this embodiment, the stainless steel square tube 1 is made of 304 or 316L stainless steel, both of which have good corrosion resistance and mechanical properties, and can be used for a long time in the working environment of the freeze dryer without being corroded. Adjacent square tubes are connected by double-sided continuous welding using composite welding or plasma welding. Composite welding, such as laser and submerged arc welding, combines the advantages of high energy density of laser welding and large penetration depth of submerged arc welding, making the weld more robust; wire welding can increase the filler volume of the weld, forming a weld with a thickness ≥1mm and equal height and width, improving the strength and sealing of the weld;

[0029] The composite welding of weld structure 4 is a combination of laser and submerged arc welding, with weld structure 4 simultaneously formed on both sides of the plate structure. In this embodiment, the composite welding adopts a combination of laser and submerged arc welding. Laser welding has the characteristics of concentrated energy and fast welding speed, which can quickly melt metal; submerged arc welding has the advantages of large penetration depth and good weld quality. Simultaneously forming weld structures 4 on both sides of the plate structure allows the welding stress to be more evenly distributed on the plate, reducing welding deformation. By welding on both sides simultaneously, the stress during the welding process is balanced, effectively controlling the welding deformation of the plate, ensuring the dimensional accuracy and flatness of the plate, which is beneficial for subsequent assembly and use. The composite welding of laser and submerged arc combines the advantages of both welding methods, improving welding efficiency and shortening the production cycle.

[0030] After welding, the main body of the plate undergoes shaping to meet flatness requirements. Weld structure 4 is ground, with its height flush with the surface of the main body. In this embodiment, shaping is performed on the main body after welding because welding stress and deformation occur during the welding process. Shaping can correct the plate through machining or other methods to achieve flatness requirements. Grinding weld structure 4 to make its height flush with the surface of the main body eliminates protrusions at the weld, resulting in a smoother surface. It also removes impurities and defects from the weld surface, improving weld quality and surface finish. Shaping ensures the flatness of the plate, allowing it to better conform to materials or other components during use, thus improving freeze-drying efficiency. Weld grinding improves the surface quality of the plate, reduces surface roughness, facilitates material placement and removal, and also makes cleaning and maintenance easier.

[0031] The surface of the main body of the plate layer is polished to achieve a surface roughness ≤ Ra1.6μm. In this embodiment, the surface of the main body of the plate layer is polished to achieve a surface roughness ≤ Ra1.6μm. Polishing further improves the smoothness of the plate layer surface, reduces microscopic unevenness, and makes the plate layer surface smoother. A smooth surface is less prone to material and dirt contamination, facilitating cleaning and disinfection, and meeting the hygiene requirements of freeze dryers in the food, pharmaceutical, and other industries.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A plate layer for a freeze dryer, characterized in that, The plate body is composed of multiple stainless steel square tubes (1) welded together in the same direction according to different specifications of plate width requirements. The two ends of the plate body are provided with sealing structures (2) formed by cutting square tubes of the same specification to appropriate size and sealing them. The sealing structure (2) is fixed with stainless steel baffles (3) of the same material inside, which are used to change the flow direction of heat transfer oil in the plate and make the heat transfer oil flow in a serpentine manner. The stainless steel square tube (1) is made of 304 or 316L stainless steel; adjacent square tubes are connected by a double-sided continuous welding method of composite welding or plasma welding to form a weld structure (4), and the weld structure (4) is welded with wire, the weld thickness is ≥1mm, and the weld height and width are equal; the composite welding is a composite welding of laser and submerged arc, and the weld structure (4) is formed on both sides of the plate structure at the same time; The plate body is shaped after welding to meet the flatness requirements. The weld structure (4) is ground and the height of the weld structure (4) is flush with the surface of the plate body. The surface of the plate body is polished and the surface roughness is ≤ Ra1.6μm.

2. The plate layer for a freeze dryer according to claim 1, characterized in that, The stainless steel square tube is a straight, equal-length tube. The sealing structure (2) is a square tube sealed on both sides and welded to both ends of the stainless steel square tube (1). The stainless steel baffle (3) is welded at equal intervals inside the sealing structure (2) and forms a serpentine heat transfer oil flow channel with the stainless steel square tube (1), so that the heat transfer oil flows in a serpentine manner.

3. The plate layer for a freeze dryer according to claim 1, characterized in that, The stainless steel square tube (1) has 45-degree oblique cuts at both ends. The sealing structure (2) is an isosceles triangle structure, which is welded to the oblique cut and connected to the stainless steel square tube (1) to form a serpentine heat transfer oil flow channel with the stainless steel square tube (1), so that the heat transfer oil flows in a serpentine manner.

Images