Vacuum freeze drier capable of maintaining temperature uniformity

Abstract

The application discloses a vacuum freeze dryer capable of maintaining uniform temperature, which comprises a drying chamber, a partition plate, a vacuumizing device, a medium circulating device and a circulating pipe. The circulating pipe is composed of temperature insulation parts and conveying parts. The temperature insulation parts are arranged in S shape and distributed on the inner top, the inner bottom of the drying chamber and three side walls except the sealing door, so as to insulate the inner wall of the drying chamber from the partition plate. Thus, the edge of the partition plate can be maintained at low temperature through the temperature insulation parts, and the temperature of the center and the edge of the partition plate is uniformized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of freeze-drying machine, more particularly, the present application relates to a vacuum freeze-drying machine capable of maintaining uniform temperature. BACKGROUND

[0002] The uniformity of temperature during the working process of the freeze-drying machine has a great influence on the drying effect of the goods. Figures 1-3 As shown in the figure, it is a pilot machine model of our company, which is mainly used for small batch production and production parameter adjustment before large batch production of production machine after pilot machine verification. It belongs to a transition machine type, so there are still some problems compared with the production machine when small batch production is carried out. Taking the cooling stage of the freeze-drying machine as an example, when the temperature of the partition plate is reduced to the set temperature such as-50 DEG C, the temperature of the side wall of the drying chamber is about-10 DEG C, and the temperature difference is large, which leads to the temperature difference between the edge of the partition plate and most of the area of the partition plate. Because the inner wall of the drying chamber can absorb the energy of the partition plate, the more the position of the partition plate is close to the side wall of the drying chamber, the more energy is absorbed, so that the temperature of the edge of the partition plate is slightly higher than that of other positions. Therefore, it also leads to the fact that the yield of the material close to the edge of the partition plate is low when small batch production is carried out. Therefore, how to make the temperature of the center of the partition plate and the edge of the partition plate uniform is the technical problem to be solved by the present application. Therefore, it is necessary to propose a vacuum freeze-drying machine capable of maintaining uniform temperature to at least partially solve the problems existing in the prior art. SUMMARY

[0003] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to try to limit the key features and necessary technical features of the claimed technical solution, and does not mean to try to determine the protection scope of the claimed technical solution.

[0004] In order to at least partially solve the above problems, the present application provides a vacuum freeze-drying machine capable of maintaining uniform temperature, comprising: a drying chamber for placing goods;

[0005] At least one partition plate arranged in the drying chamber;

[0006] A vacuum pumping device in communication with the drying chamber through a cold trap;

[0007] A medium circulation device located outside the drying chamber for refrigerant circulation, refrigeration and heating;

[0008] The dry chamber is provided with a circulation pipe in communication with the medium circulation device, the circulation pipe is composed of a temperature insulation part provided at the inner wall of the dry chamber or the edge of the partition plate and in communication with the partition plate, and a conveying part in communication with the partition plate, and the temperature insulation part is in communication with the conveying part, and the refrigerant medium enters the partition plate through the conveying part and is conveyed back to the medium circulation device by the temperature insulation part, or the refrigerant medium enters the partition plate through the temperature insulation part and is conveyed back to the medium circulation device by the conveying part.

[0009] Preferably, the medium circulation device is composed of a refrigeration system connected with the heat exchanger and performing temperature control on the heat exchanger, and a circulation pump connected with the heat exchanger and used for circulating the refrigerant medium, the medium inlet end of the circulation pipe is in communication with the heat exchanger, the medium outlet end of the circulation pipe is in communication with the circulation pump, and the refrigeration system is connected with the cold trap and performs temperature control on the cold trap.

[0010] Preferably, a medium temperature rising device is arranged between the medium outlet end of the circulation pipe and the circulation pump.

[0011] Preferably, the partition plate is a hollow structure, and the partition plate is provided with a medium channel formed in an S shape by a plurality of guide plates, and the two ends of the medium channel are respectively a medium inlet end and a medium outlet end.

[0012] When the medium inlet end of the medium channel is in communication with the medium circulation device through the conveying part of the circulation pipe, the medium outlet end of the medium channel is in communication with the medium circulation device through the temperature insulation part of the circulation pipe.

[0013] When the medium inlet end of the medium channel is in communication with the medium circulation device through the temperature insulation part of the circulation pipe, the medium outlet end of the medium channel is in communication with the medium circulation device through the conveying part of the circulation pipe.

[0014] Preferably, the temperature insulation part is provided with a heat blocking device.

[0015] When the temperature insulation part is arranged on the inner wall of the dry chamber, the temperature insulation part is connected with the inner wall of the dry chamber through the heat blocking device, and a gap is reserved between the temperature insulation part and the inner wall of the dry chamber.

[0016] When the temperature insulation part is arranged at the edge of the partition plate, the heat blocking device extends to between the upper and lower adjacent partition plates.

[0017] Preferably, the heat blocking device is composed of a first extension and a second extension extending away from the temperature insulation part, the first extension and the second extension extend in opposite directions, a groove is arranged on the first extension for connecting with the temperature insulation part, the length of the first extension is greater than the length of the second extension, and the first extension and the second extension are both arranged perpendicularly to the temperature insulation part.

[0018] When the refrigeration medium enters the baffle through the temperature insulation part, the first extension extends towards the inner wall of the drying chamber, and the second extension extends towards the baffle and is located between the upper and lower adjacent baffles.

[0019] When the refrigeration medium enters the medium circulation device through the temperature insulation part, the first extension extends towards the baffle, and the second extension extends towards the inner wall of the drying chamber.

[0020] Preferably, the heat blocking device is composed of at least one upper pipe extension and a lower pipe extension extending away from the temperature insulation part, and a mounting part for fixing the upper pipe extension, the lower pipe extension and the temperature insulation part, the upper pipe extension and the lower pipe extension are the same in structure and are both composed of a reflux section and a flow guiding section for changing and guiding the temperature flow direction, the flow guiding sections of adjacent upper pipe extensions and lower pipe extensions are connected, the circulation pipe of the temperature insulation part is located at the connection of the upper pipe extension and the lower pipe extension and is located on the side close to the inner wall of the drying chamber.

[0021] Preferably, the reflux section is curved in a semicircular arc shape, the opening direction of the reflux section is opposite to the baffle, the flow guiding section is arc-shaped, the flow guiding section of the upper pipe extension is located below the reflux section of the upper pipe extension, and the flow guiding section of the lower pipe extension is located above the reflux section of the lower pipe extension.

[0022] Preferably, when the temperature insulation part is arranged at the edge of the baffle, the heat blocking device is composed of a sleeve pipe sleeved on the temperature insulation part and at least four edge extensions on the outer wall of the sleeve pipe extending away from the sleeve pipe, the edge extensions extend towards the baffle, the inner wall of the drying chamber and the space between the upper and lower adjacent baffles respectively, a connecting extension is arranged on the outer wall of the sleeve pipe, and two adjacent edge extensions with different extension directions are connected through the connecting extension.

[0023] Preferably, the drying chamber is provided with a sealing door, the inner wall of the sealing door is provided with a first adjusting partition and a second adjusting partition, the first adjusting partition and the second adjusting partition are movably connected through a partition plate, the first adjusting partition and the second adjusting partition are the same in structure and are both composed of a mounting strip provided with a plurality of flaps and a heat preservation plate movably connected with the flaps on the mounting strip, the mounting strip of the first adjusting partition and the mounting strip of the second adjusting partition are movably connected with the track groove on the sealing door through a sliding block, and the heat preservation plates of the first adjusting partition and the second adjusting partition are arranged alternately.

[0024] Compared with the prior art, the present application has at least the following beneficial effects:

[0025] The temperature insulation parts can be arranged in S shape together, as shown in Figure 6 , and are distributed on the inner top, inner bottom and three side walls of the drying chamber except the sealing door, so as to insulate the inner wall of the drying chamber from the partition plate, so that the edge of the partition plate can maintain low temperature through the temperature insulation parts, and the temperature of the center and the edge of the partition plate is uniformized, as shown in Figure 5 .

[0026] Similarly, the positional relationship between the temperature insulation part and the conveying part can be adjusted, for example:

[0027] When the medium inlet end of the medium channel is communicated with the medium circulation device through the conveying part of the circulating pipe, the medium outlet end of the medium channel is communicated with the medium circulation device through the temperature insulation part of the circulating pipe, in this case, the refrigerant entering the drying chamber through the heat exchanger will first flow through the partition plate to cool the material thereon, and then enter the temperature insulation part to maintain the uniformity of the temperature, this arrangement is suitable for a small-sized pilot plant, because the refrigerant circulates quickly, the temperature difference between the temperature insulation part and the partition plate can be basically ignored.

[0028] When the medium inlet end of the medium channel is communicated with the medium circulation device through the heat insulation part of the circulation pipe, and the medium outlet end of the medium channel is communicated with the medium circulation device through the conveying part of the circulation pipe, in this case, the refrigerant medium entering the drying chamber through the heat exchanger will first flow through the heat insulation part, and then enter the partition plate to be cooled, this setting is suitable for a large volume pilot machine, and the refrigerant medium first flows through the heat insulation part to increase the cold release between the partition plate and the inner wall of the drying chamber, so as to avoid affecting the uniformity of the temperature on the partition plate, because this embodiment adopts the cold diffusion through the heat insulation part first, so in order to make the partition plate reach the set temperature, the temperature of the refrigerant medium entering the heat insulation part needs to be appropriately reduced, so as to ensure that when it flows through the partition plate, it will not affect the cooling effect of the partition plate, and because the temperature of the refrigerant medium entering the heat insulation part needs to be appropriately reduced, this setting is more suitable for a large volume pilot machine.

[0029] The vacuum freeze dryer capable of maintaining uniform temperature of the present application, other advantages, objects and features of the present application will be embodied in part through the following description, and part will be understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, together with embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0031] Figure 1 The external structure schematic diagram of the vacuum freeze dryer capable of maintaining uniform temperature of the present application.

[0032] Figure 2 The internal structure schematic diagram of the vacuum freeze dryer capable of maintaining uniform temperature of the present application without configuring the heat blocking device.

[0033] Figure 3 The internal structure schematic diagram of the vacuum freeze dryer capable of maintaining uniform temperature of the present application with the heat blocking device. Figure 2 The refrigerant medium flow schematic diagram (A), and the internal refrigerant medium flow schematic diagram (B) of the partition plate (top view).

[0034] Figure 4 The temperature difference schematic diagram in the prior art.

[0035] Figure 5 The temperature difference schematic diagram in the vacuum freeze dryer capable of maintaining uniform temperature of the present application with the heat insulation part.

[0036] Figure 6 The position schematic diagram of the first embodiment of the heat blocking device and the heat insulation part in the vacuum freeze dryer capable of maintaining uniform temperature of the present application.

[0037] Figure 7 Structure diagram of the first embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application (the temperature insulation part is not shown).

[0038] Figure 8 Structure diagram of the second embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application. Figure 7 Expanded structure diagram.

[0039] Figure 9 Structure diagram of the second embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application.

[0040] Figure 10 Position diagram of the second embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application in the drying chamber.

[0041] Figure 11 Structure diagram of the third embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application.

[0042] Figure 12 Position diagram of the third embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application in the drying chamber.

[0043] Figure 13 Switch diagram of the first and second adjustment partitions in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application.

[0044] Figure 14 Structure diagram of the second embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application. Figure 13 Expanded structure diagram of the second embodiment of the heat partition device in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application.

[0045] Figure 15 Installation diagram of the flap and the heat preservation plate in the vacuum freeze dryer capable of maintaining temperature uniformity according to the present application.

[0046] In the figure: 1 drying chamber, 2 partition, 3 circulation pipe, 31 temperature insulation part, 5, 6, 7 heat partition device, 51 first extension, 52 second extension, 61 pipe upper extension, 62 pipe lower extension 63, installation part, 64 backflow section, 65 drainage section, 71 sleeve, 72 edge extension, 73 connection extension, 8 sealing door, 81 first adjustment partition, 82 second adjustment partition, 83 partition plate, 84 flap, 85 installation strip, 86 heat preservation plate, 87 sliding block, 88 track groove, 100 region conforming to the set temperature, 200 region higher than the set temperature. DETAILED DESCRIPTION

[0047] The application will be described in further detail below with reference to the drawings and embodiments so as to enable those skilled in the art to carry out the application according to the description herein.

[0048] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0049] As shown in the drawings, Figures 1-15 The application provides a vacuum freeze-drying machine capable of maintaining uniform temperature, comprising: a drying chamber 1 for placing materials;

[0050] At least one partition plate 2 arranged in the drying chamber 1, a tray for placing materials or containers is placed above the partition plate 2, and a refrigeration medium is used to cool the materials or containers placed thereon during freezing;

[0051] A vacuum pumping device in communication with the drying chamber 1 through a cold trap, the partition plate 2 is heated after being cooled to a set temperature. At the same time, the vacuum pumping device pumps the drying chamber 1 to vacuum, so that the water in the materials sublimates, and the gaseous water is condensed into frost when passing through the cold trap and is collected;

[0052] A medium circulation device for circulating, refrigerating and heating the refrigeration medium outside the drying chamber 1;

[0053] The drying chamber 1 is provided with a circulation pipe 3 in communication with the medium circulation device, the partition plate 2 is a hollow structure, the partition plate 2 is provided with a medium channel formed in an S shape by a plurality of guide plates, and the two ends of the medium channel are a medium inlet end and a medium outlet end, respectively; the medium circulation device is composed of a refrigeration system connected with a heat exchanger and used to control the temperature of the heat exchanger, and a circulation pump connected with the heat exchanger and used to circulate the refrigeration medium, the medium inlet end of the circulation pipe 3 is in communication with the heat exchanger, the medium outlet end of the circulation pipe 3 is in communication with the circulation pump, and the refrigeration system is connected with the cold trap and used to control the temperature of the cold trap.

[0054] The medium outlet end of the circulation pipe 3 is provided with a medium heating device. The principle of the application in the process of vacuum freeze-drying is the same as that of the prior art, that is, the refrigeration medium is cooled by the refrigeration system, and the refrigeration medium can be selected as silicon oil. The cooled refrigeration medium enters the drying chamber 1 through the circulation pipe 3 connected with the heat exchanger. First, the refrigeration medium flows into the partition plate 2 from the medium inlet end of the partition plate 2, and the medium channel in the partition plate 2 is in an S shape, Figure 3As shown in Figure B, by setting up a medium channel to increase the flow path of the medium within the partition 2, the cooling effect of the partition 2 is increased. Finally, the refrigerant leaves the partition 2 through its outlet and flows towards the heat exchanger via the circulation pipe 3. The circulation pump assists in the flow and circulation of the refrigerant. Since the refrigeration system can only cool the refrigerant, a medium heating device is usually added before the refrigerant circulates back to the heat exchanger to regulate its temperature. During sublimation, the partition 2 can be heated. This medium heating device can be a heating kettle or any commercially available equipment or existing technology. The cold trap is also connected to the refrigeration system, allowing the system to cool the cold trap while simultaneously cooling the refrigerant, enabling the cold trap to condense the vaporized water into frost. Because the drying chamber 1 is typically made of stainless steel, it absorbs heat from the drying chamber 1 during refrigeration, resulting in a higher temperature at the edge of the partition 2 compared to the center. Figure 4 As shown, if the user intends to use it for mass production, equipment with better uniformity can be used. However, this invention is primarily designed for our pilot-scale machine, which is a model used for small-batch production and parameter adjustments after theoretical verification through a test machine. It is a model that can balance production and experimentation. The temperature difference problem mentioned in the background art has always existed in pilot-scale machines. Therefore, we have adjusted the circulation pipe 3 to minimize the uneven temperature between the edge and center of the partition 2 caused by the inner wall material of the drying chamber 1.

[0055] The circulation pipe 3 consists of a heat-insulating portion 31 disposed on the inner wall of the drying chamber 1 or at the edge of the partition 2 and communicating with the partition 2, and a conveying portion communicating with the partition 2. The heat-insulating portion 31 is connected to the conveying portion, and the function of the conveying portion is the same as that of the circulation pipe 3 in conventional technology, which is only used to transport the refrigerant. The connection between the heat-insulating portion 31 and the conveying portion mentioned in this invention is intended to illustrate that the refrigerant can reach the partition 2 from the conveying portion and then enter the heat-insulating portion 31 from the partition 2. That is, after the refrigerant enters the partition 2 via the conveying portion, it is transported back to the medium circulation device by the heat-insulating portion 31. Alternatively, the refrigerant can reach the partition 2 from the heat-insulating portion 31 and then enter the conveying portion from the partition 2. That is, after the refrigerant enters the partition 2 via the heat-insulating portion 31, it is transported back to the medium circulation device by the conveying portion.

[0056] The insulation components 31 can be arranged in an S-shape, such as... Figure 6The temperature maintaining part 31 is arranged on the inner wall of the drying chamber 1, and is distributed on the inner top, inner bottom, and three side walls of the drying chamber 1 except the sealing door 8, so as to isolate the inner wall of the drying chamber 1 from the partition 2, so that the edge of the partition 2 can maintain low temperature through the temperature maintaining part 31, and the temperature of the center and edge of the partition 2 is uniformized, as shown in Figure 5

[0057] Similarly, the positional relationship between the temperature maintaining part 31 and the conveying part can be adjusted, for example:

[0058] When the medium inlet end of the medium channel is communicated with the medium circulating device through the conveying part of the circulating pipe 3, the medium outlet end of the medium channel is communicated with the medium circulating device through the temperature maintaining part 31 of the circulating pipe 3, in this case, the refrigerant entering the drying chamber 1 through the heat exchanger will first flow through the partition 2 to cool the material thereon, and then enter the temperature maintaining part 31 to maintain the uniformity of the temperature, and this setting mode is suitable for a small-sized pilot machine, because the refrigerant circulates quickly, and the temperature difference between the temperature maintaining part 31 and the partition 2 can be basically ignored;

[0059] When the medium inlet end of the medium channel is communicated with the medium circulating device through the temperature maintaining part 31 of the circulating pipe 3, the medium outlet end of the medium channel is communicated with the medium circulating device through the conveying part of the circulating pipe 3, in this case, the refrigerant entering the drying chamber 1 through the heat exchanger will first flow through the temperature maintaining part 31, and then enter the partition 2 to cool, and this setting mode is suitable for a large-sized pilot machine, so that the refrigerant first flows through the temperature maintaining part 31 to increase the cold release between the partition 2 and the inner wall of the drying chamber 1, and avoid affecting the uniformity of the temperature of the partition 2, because this embodiment adopts the cold diffusion through the temperature maintaining part 31 first, so as to appropriately reduce the temperature of the refrigerant entering the temperature maintaining part 31, so as to ensure that the refrigerant will not affect the cooling effect of the partition 2 when it flows through the partition 2, and also because the temperature of the refrigerant entering the temperature maintaining part 31 needs to be appropriately reduced, so that this setting mode is more suitable for a large-sized pilot machine.

[0060] ​In the above, we provide a most simple method to improve the heat uniformity at the edge and center of the partition 2, that is, to set the temperature insulation part 31 to reduce the temperature between the inner wall of the drying chamber 1 and the edge of the partition 2. In actual application, because the temperature insulation part 31 will increase the path of the circulating pipe 3 in the drying chamber 1, resulting in the increase of the power consumption of the refrigeration system, therefore, under the premise of ensuring the heat uniformity through the above-mentioned embodiment, how to shorten the length of the temperature insulation part 31 as much as possible to reduce the power consumption of the refrigeration system is needed to be considered. For this purpose, we provide three kinds of heat blocking devices 5, 6, 7 arranged on the temperature insulation part 31 to improve the cold diffusion efficiency of the temperature insulation part 31.

[0061] In the first embodiment, the temperature insulation part 31 is provided with the heat blocking device 5;

[0062] When the temperature insulation part 31 is arranged on the inner wall of the drying chamber 1, the temperature insulation part 31 is connected with the inner wall of the drying chamber 1 through the heat blocking device 5. It should be noted that the connection here can be fixed connection, indirect connection, abutment or spacing arrangement, for example, a gap is reserved between the temperature insulation part 31 and the inner wall of the drying chamber 1, and a gap is also reserved between the heat blocking device 5 and the inner wall of the drying chamber 1;

[0063] When the temperature insulation part 31 is arranged at the edge of the partition 2, the heat blocking device 5 extends between the upper and lower adjacent two partitions 2. Taking two layers of partitions 2 as an example, the heat blocking device 5 needs to extend from the bottom of the lower partition 2 to the upper side of the material of the upper partition 2.

[0064] The heat blocking device 5 is composed of a first extension part 51 and a second extension part 52 extending away from the temperature insulation part 31, the extension directions of the first extension part 51 and the second extension part 52 are opposite, the first extension part 51 is provided with a groove for connecting with the temperature insulation part 31, the S-shaped temperature insulation part 31 can be inserted into the groove, and the connection and heat transfer with the heat blocking device 5 are realized through the groove. As shown in the figure. Figure 6 The length of the first extension part 51 is greater than the length of the second extension part 52, and the first extension part 51 and the second extension part 52 are both arranged perpendicularly to the temperature insulation part 31. The heat blocking device 5 in this embodiment is the simplest in production process and the most simple in installation method, which can be punched from a plate material with good thermal conductivity, and after unfolding, it can be directly bent into a three-dimensional shape as shown in the figure. Figure 8 Figure 7 The more important thing is that this embodiment can be directly applied to the products sold by our company, such as Figures 1-2 ​The length of the first extension 51 is longer, and its main purpose is to increase the diffusion area of cold as much as possible. According to the different positions of the temperature insulation part 31 in the drying chamber 1 and the connection position with the partition plate 2, the setting direction is also different. For example:

[0065] When the refrigerant enters the partition plate 2 through the temperature insulation part 31, because the temperature of the temperature insulation part 31 is lower than that of the partition plate 2, we usually set the temperature insulation part 31 at a position close to the edge of the partition plate 2. The first extension 51 extends to the inner wall of the drying chamber 1, so that the cold can quickly diffuse to the inner wall of the drying chamber 1. Because the cold diffusion range and area of the first extension 51 are larger than those of the second extension 52, the position of the drying chamber 1 inner wall absorbing cold can be as far away from the edge of the partition plate 2 as possible, thereby avoiding affecting the temperature of the edge of the partition plate 2. The second extension 52 extends to the partition plate 2 to provide cold to the edge of the partition plate 2 and is located between the upper and lower adjacent partition plates 2. The second extension 52 needs to span two partition plates 2 to maintain the uniformity of the edge temperature and the center temperature of the partition plate 2.

[0066] When the refrigerant enters the medium circulating device through the temperature insulation part 31, we usually set the temperature insulation part 31 at a position close to the inner wall of the drying chamber 1. The first extension 51 extends to the partition plate 2, and the second extension 52 extends to the inner wall of the drying chamber 1. The principle is similar to the above, and will not be repeated here.

[0067] In the second embodiment, the temperature insulation part 31 is provided with a heat blocking device 6.

[0068] When the temperature insulation part 31 is arranged on the inner wall of the drying chamber 1, the temperature insulation part 31 is connected to the inner wall of the drying chamber 1 through the heat blocking device 6, and a gap is reserved between the temperature insulation part 31 and the inner wall of the drying chamber 1.

[0069] When the temperature insulation part 31 is arranged at the edge of the partition plate 2, the heat blocking device 6 extends between the upper and lower adjacent partition plates 2.

[0070] In the second embodiment, we usually set it at a position close to the inner wall of the drying chamber 1, and compared with the first embodiment, the temperature insulation part 31 in this embodiment can adopt a shorter path.

[0071] The heat blocking device 6 is composed of at least one pipe upper extension 61 and pipe lower extension 62 extending away from the temperature insulation part 31, and a mounting part 63 for fixing the pipe upper extension 61, pipe lower extension 62 and the temperature insulation part 31. The pipe upper extension 61 and the pipe lower extension 62 are the same structure, and are arranged in a symmetrical form, as shown in Figure 9 , 10 The pipe upper extension 61 and the pipe lower extension 62 are composed of a reflux section 64 and a drainage section 65 for changing and guiding temperature flow direction. The drainage sections 65 of adjacent pipe upper extension 61 and pipe lower extension 62 are connected, and the circulation pipe 3 of the temperature insulation part 31 is located at the connection of the pipe upper extension 61 and the pipe lower extension 62, and is located near one side of the inner wall of the drying chamber 1.

[0072] The reflux section 64 is curved in a semicircular arc shape, and the opening direction of the reflux section 64 is opposite to the partition plate 2. Through the reflux section 64, the cold quantity diffused to the inner wall of the drying chamber 1 can be collected, and the diffusion direction can be changed through the semicircular arc bending, so that the cold quantity can be backflowed to the edge of the partition plate 2 through the drainage section 65. The drainage section 65 is arc-shaped, the drainage section 65 of the pipe upper extension 61 is located below the reflux section 64 of the pipe upper extension 61, and the drainage section 65 of the pipe lower extension 62 is located above the reflux section 64 of the pipe lower extension 62. The temperature insulation part 31 is located between the heat blocking device 6 and the inner wall of the drying chamber 1, and the cold quantity diffused by the temperature insulation part 31 is blocked by the heat blocking device 6, so that the cold quantity diffused by the temperature insulation part 31 can only be absorbed by the inner wall of the drying chamber 1 and the heat blocking device 6, thereby avoiding affecting the temperature at the edge of the partition plate 2.

[0073] In the third embodiment, the temperature insulation part 31 is provided with a heat blocking device 7.

[0074] The temperature insulation part 31 is arranged at the edge of the partition plate 2, and the heat blocking device 7 extends to the upper and lower adjacent partition plates 2.

[0075] The heat blocking device 7 is a sleeve 71 sleeved on the temperature insulation part 31, and at least four edge extensions 72 extending away from the sleeve 71 are arranged on the outer wall of the sleeve 71, which respectively extend towards the direction of the baffle 2, the direction of the inner wall of the drying chamber 1, and the direction between the baffle 2 and the upper and lower two adjacent baffles 2. The outer wall of the sleeve 71 is provided with a connecting extension 73, and two adjacent edge extensions 72 in different extension directions are connected through the connecting extension 73. In this embodiment, the most common implementation of increasing the diffusion area is adopted, that is, the cold of the temperature insulation part 31 is guided to the edge extensions 72 through the sleeve 71, and the cold is diffused to the upper, lower, inner and outer edges of the baffle 2 through the edge extensions 72. Since the diffusion directions are perpendicular to each other, in order to enable the edge extensions 72 at the corners to realize the transmission of cold, the connecting extension 73 is arranged and extends radially outward from the sleeve 71, as shown in Figure 11 , to provide cold for the edge extensions 72 at the corners.

[0076] Compared with the previous two embodiments, the cold diffusion is more uniform, and the structure is small and more suitable for use in small-volume pilot machines.

[0077] In the above embodiments, the temperature insulation part 31 is added to the inner wall of the drying chamber 1 to ensure that the edge of the baffle 2 is not affected by the inner wall of the drying chamber 1. Next, we need to solve the temperature differentiation problem between the opening of the drying chamber 1, that is, the sealing door 8 of the drying chamber 1 and the edge of the baffle 2. As mentioned earlier, because the pilot machine of our company is a transitional model, it is used not only for small-batch production, but also for production parameter adjustment and experiments. In order to facilitate the observation of the changes of the internal materials, the transparent sealing door 8 is usually used in the pilot machine. Therefore, the temperature difference between the edge of the baffle 2 near the sealing door 8 and the sealing door 8 is larger, and the yield is lower. Since the sealing door 8 needs to be opened and closed frequently, it is not possible to set the temperature insulation part 31 as in the above scheme. Therefore, the structure of the sealing door 8 is optimized, especially at the position of the transparent acrylic or glass, the heat preservation and heat insulation structure is optimized. The inner wall of the sealing door 8 is provided with a first adjustment partition 81 and a second adjustment partition 82, and the first adjustment partition 81 and the second adjustment partition 82 are movably connected through a partition plate 83. The first adjustment partition 81, the second adjustment partition 82 and the partition plate 83 have the same structure and are composed of a mounting strip 85 provided with a plurality of flaps 84 and a heat preservation plate 86 movably connected with the flaps 84 on the mounting strip 85. The flaps 84 are arranged in a staggered manner, and the heat preservation plate 86 is arranged between the flaps 84 of the mounting strip 85, as shown in Figure 15As shown, it is composed of a cylindrical structure for hinging with the mounting strip 85, and a clamping plate provided on the cylindrical structure for clamping the thermal insulation plate 86. The mounting strip 85 can be a groove structure, the cylindrical structure is located in the groove, and the two ends of the cylindrical structure are hinged with the inner wall of the groove. The thermal insulation plate 86 is inserted into the clamping plate, and the clamping plate is provided with a column for connecting with the thermal insulation plate 86. The thermal insulation plate 86 is provided with a hole that can be sleeved on the column. When installing, the thermal insulation plate 86 is inserted into the clamping plate, and the hole on the thermal insulation plate 86 is sleeved on the column. When the first adjusting partition 81 and the second adjusting partition 82 move, the thermal insulation plate 86 can rotate relative to the clamping plate. The mounting strip 85 of the first adjusting partition 81 and the second adjusting partition 82 is movably connected with the track groove 88 on the sealing door 8 through the sliding block 87. The thermal insulation plate 86 of the first adjusting partition 81 and the thermal insulation plate 86 of the second adjusting partition 82 are arranged alternately up and down, so that the first adjusting partition 81 and the second adjusting partition 82 can be attached together. As shown in FIG. 9, Figure 13 When small-batch production is carried out, it is not necessary to observe the internal materials through the sealing door 8. At this time, we can slide the first adjusting partition 81 and the second adjusting partition 82 to the two ends of the track groove 88 respectively. At this time, the first adjusting partition 81, the second adjusting partition 82 and the partition plate 83 are located in the same plane. By rotating the flap 84, the thermal insulation plate 86 is in a parallel state with the sealing door 8. At this time, the upper and lower adjacent two thermal insulation plates 86 can be attached at the edge, so as to be spliced into a whole thermal insulation plate for insulating the interior of the drying chamber 1. If it is necessary to observe the internal materials, the thermal insulation plate 86 at the corresponding position is turned over, so that the thermal insulation plate 86 at this part is in a parallel state with the sealing door 8. The remaining thermal insulation plates 86 are still parallel to the sealing door 8 and attached to each other, so as to reduce the area of the sealing door 8 exposed in the drying chamber 1 under the premise of ensuring the observation of the internal condition, thereby reducing the influence of the sealing door 8 on the temperature uniformity of the edge and the center of the partition plate 2. When it is necessary to completely open the first adjusting partition 81 and the second adjusting partition 82, as shown in FIG. 10, Figure 13 the first adjusting partition 81 or the second adjusting partition 82 is slid until they are attached together, and the partition plate 83 is placed between the partition plate 2 and the inner wall of the drying chamber 1, thereby facilitating the observation of the interior of the drying chamber 1 during the experiment.

[0078] In the description of the application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0079] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0080] Although the embodiments of the present application have been disclosed as above, it is not limited to the application and implementation listed in the specification and embodiments, and it can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A vacuum freeze dryer capable of maintaining a uniform temperature, characterized by, The utility model relates to a drying room for placing materials, comprising: a drying room (1) for placing materials; at least one partition (2) arranged in the drying room (1); a vacuumizing device in communication with the drying room (1) through a cold trap; a medium circulating device for circulating, cooling and heating refrigerating medium outside the drying room (1); a circulating pipe (3) in communication with the medium circulating device is arranged in the drying room (1), the circulating pipe (3) is composed of a temperature insulation part (31) arranged at the edge of the partition (2) or the inner wall of the drying room (1) and in communication with the partition (2), and a conveying part in communication with the partition (2), the temperature insulation part (31) is in communication with the conveying part, and the refrigerating medium enters the partition (2) through the conveying part and is conveyed back to the medium circulating device through the temperature insulation part (31), or the refrigerating medium enters the partition (2) through the temperature insulation part (31) and is conveyed back to the medium circulating device through the conveying part; the temperature insulation part (31) is provided with heat blocking devices (5, 6, 7); when the temperature insulation part (31) is arranged on the inner wall of the drying room (1), the temperature insulation part (31) is connected with the inner wall of the drying room (1) through the heat blocking device (5), and a gap is reserved between the temperature insulation part (31) and the inner wall of the drying room (1); when the temperature insulation part (31) is arranged at the edge of the partition (2), the heat blocking devices (6, 7) extend to between two adjacent partitions (2) above and below; a sealing door (8) is arranged on the drying room (1), a first adjusting partition (81) and a second adjusting partition (82) are arranged on the inner wall of the sealing door (8), and the first adjusting partition (81) and the second adjusting partition (82) are movably connected through a partition plate (83); the first adjusting partition (81) and the second adjusting partition (82) are the same in structure and are each composed of a mounting strip (85) provided with a plurality of flaps (84) and a heat preservation plate (86) movably connected with the flaps (84) on the mounting strip (85), the mounting strips (85) of the first adjusting partition (81) and the second adjusting partition (82) are movably connected with rail grooves (88) on the sealing door (8) through sliding blocks (87), and the heat preservation plates (86) of the first adjusting partition (81) and the second adjusting partition (82) are arranged in an upper and lower staggered mode.

2. The vacuum freeze dryer capable of maintaining temperature uniformity according to claim 1, wherein the medium circulating device is composed of a refrigerating system connected with a heat exchanger and used for temperature control of the heat exchanger, and a circulating pump connected with the heat exchanger and used for refrigerating medium circulation, the medium inlet end of the circulating pipe (3) is in communication with the heat exchanger, the medium outlet end of the circulating pipe (3) is in communication with the circulating pump, and the refrigerating system is connected with the cold trap and used for temperature control of the cold trap.

3. The vacuum freeze dryer capable of maintaining temperature uniformity according to claim 2, wherein a medium temperature rising device is arranged between the medium outlet end of the circulating pipe (3) and the circulating pump.

4. The vacuum freeze dryer capable of maintaining temperature uniformity according to claim 1, wherein The baffle (2) is a hollow structure, and a medium channel formed by S-shaped guide plates is arranged in the baffle (2), and two ends of the medium channel are a medium inlet end and a medium outlet end respectively; When the medium inlet end of the medium channel is communicated with the medium circulation device through the conveying part of the circulation pipe (3), the medium outlet end of the medium channel is communicated with the medium circulation device through the temperature insulation part (31) of the circulation pipe (3); When the medium inlet end of the medium channel is communicated with the medium circulation device through the temperature insulation part (31) of the circulation pipe (3), the medium outlet end of the medium channel is communicated with the medium circulation device through the conveying part of the circulation pipe (3).

5. The vacuum freeze dryer capable of maintaining temperature uniformity according to claim 1, wherein The heat blocking device (5) is composed of a first extension part (51) and a second extension part (52) extending away from the temperature insulation part (31), the extension directions of the first extension part (51) and the second extension part (52) are opposite, a groove for connecting with the temperature insulation part (31) is arranged on the first extension part (51), the length of the first extension part (51) is greater than the length of the second extension part (52), and the first extension part (51) and the second extension part (52) are both arranged perpendicularly to the temperature insulation part (31); When the refrigeration medium enters the baffle (2) through the temperature insulation part (31), the first extension part (51) extends towards the inner wall of the drying chamber (1), and the second extension part (52) extends towards the baffle (2) and is located between two adjacent baffles (2) above and below; When the refrigeration medium enters the medium circulation device through the temperature insulation part (31), the first extension part (51) extends towards the baffle (2), and the second extension part (52) extends towards the inner wall of the drying chamber (1).

6. The vacuum freeze dryer capable of maintaining temperature uniformity according to claim 1, wherein The heat blocking device (6) is composed of at least one upper pipe extension part (61) and one lower pipe extension part (62) extending away from the temperature insulation part (31), and a mounting part (63) for fixing the upper pipe extension part (61), the lower pipe extension part (62) and the temperature insulation part (31), the upper pipe extension part (61) and the lower pipe extension part (62) are the same in structure and are both composed of a reverse flow section (64) for changing and guiding temperature flow direction and a flow guiding section (65), the flow guiding sections (65) of adjacent upper pipe extension parts (61) and lower pipe extension parts (62) are connected, the circulation pipe (3) of the temperature insulation part (31) is located at the connection of the upper pipe extension part (61) and the lower pipe extension part (62) and is located on the side close to the inner wall of the drying chamber (1).

7. The vacuum freeze dryer capable of maintaining temperature uniformity according to claim 6, wherein The reverse flow section (64) is curved in a semicircular arc shape, the opening direction of the reverse flow section (64) is opposite to the baffle (2), the flow guiding section (65) is arc-shaped, the flow guiding section (65) of the upper pipe extension part (61) is located below the reverse flow section (64) of the upper pipe extension part (61), and the flow guiding section (65) of the lower pipe extension part (62) is located above the reverse flow section (64) of the lower pipe extension part (62).

8. The vacuum freeze dryer capable of maintaining temperature uniformity according to claim 1, wherein When the temperature insulation part (31) is arranged at the edge of the partition plate (2), the heat blocking device (7) is a sleeve (71) sleeved on the temperature insulation part (31), and at least four edge extensions (72) extending away from the sleeve (71) are arranged on the outer wall of the sleeve (71), the edge extensions (72) respectively extend towards the direction of the partition plate (2), the direction of the inner wall of the drying chamber (1), and the direction between the partition plate (2) and the upper and lower two adjacent partition plates (2), and a connecting extension (73) is arranged on the outer wall of the sleeve (71), and two adjacent edge extensions (72) in different extension directions are connected through the connecting extension (73).

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