Control method and device for freeze dryer and freeze dryer

Abstract

The invention relates to the technical field of freeze drying, and discloses a control method for a freeze dryer, the freeze dryer comprises a refrigerating system, a drying chamber, a cold trap, a temperature sensor and a vacuum pump, the refrigerating system is used for refrigerating the drying chamber and the cold trap, and the vacuum pump is used for vacuumizing the drying chamber; the temperature sensor is used for acquiring the temperature in the cold trap; the control method comprises the following steps: controlling the refrigerating system to refrigerate the cold trap; acquiring a first temperature T1 in the cold trap; controlling a refrigerating system and a vacuum pump to refrigerate and vacuumize the drying chamber under the condition that preset conditions are met; wherein the preset condition includes that the first temperature T1 is smaller than or equal to the first temperature threshold value. Through the arrangement, when the cold trap and the drying chamber are simultaneously refrigerated subsequently, the cold quantity required by the cold trap can be reduced, so that the refrigeration depth and time of the cold trap are prevented from being influenced. Meanwhile, the invention further discloses a control device for the freeze dryer and the freeze dryer.

Description

Technical Field

[0001] The present application relates to the field of freeze-drying technology, for example, to a control method and device for a freeze dryer, and a freeze dryer. Background Art

[0002] A freeze dryer, also known as a freeze dryer or vacuum freeze dryer, is a device specifically used to remove moisture from an object to achieve long-term preservation and maintain its original properties. It is widely used in the fields of biology, medicine, food, etc. A freeze dryer is generally equipped with a cold trap and a drying chamber. The drying chamber is used to dry the material, and the cold trap is mainly used to remove moisture and capture water vapor.

[0003] In the related art, the existing freeze dryer is generally provided with a refrigeration system, and the cold trap and the drying chamber are cooled by the refrigeration system.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] In the related art, the cold trap and drying chamber of the existing freeze dryer share a refrigeration system. Therefore, when the cold trap is refrigerated, the drying chamber may share the cooling capacity of the refrigeration system, thereby affecting the refrigeration depth and time of the cold trap.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The disclosed embodiment provides a control method and device for a freeze dryer, and a freeze dryer. Before the freeze dryer formally freezes and dries the material in the drying chamber, the cold trap can be cooled separately by a refrigeration system to quickly reduce the cold trap to a lower temperature. In this way, when the cold trap and the drying chamber are cooled simultaneously later, the refrigeration depth and time of the cold trap can be avoided from being affected.

[0009] An embodiment of the present disclosure provides a control method for a freeze dryer, wherein the freeze dryer includes: a refrigeration system, a drying chamber, a cold trap, a temperature sensor and a vacuum pump, wherein the refrigeration system is used to refrigerate the drying chamber and the cold trap, the vacuum pump is used to vacuum the drying chamber, and the temperature sensor is used to obtain the temperature in the cold trap; the control method includes: controlling the refrigeration system to refrigerate the cold trap; obtaining a first temperature T1 in the cold trap; and, when a preset condition is met, controlling the refrigeration system and the vacuum pump to refrigerate and vacuum the drying chamber; wherein the preset condition includes that the first temperature T1 is less than or equal to a first temperature threshold.

[0010] In some embodiments, the vacuum pump is also used to evacuate the cold trap; after obtaining the first temperature T1 in the cold trap, the control method also includes: when the first temperature T1 is less than or equal to the second temperature threshold, controlling the vacuum pump to evacuate the cold trap; wherein the preset condition also includes the running time of the vacuum pump being greater than or equal to the preset time.

[0011] In some embodiments, the first temperature T1 is less than or equal to the second temperature threshold, including: the first temperature T1 is less than or equal to -30°C.

[0012] In some embodiments, the running time of the vacuum pump is greater than or equal to a preset time includes: the running time of the vacuum pump is greater than or equal to 10 minutes.

[0013] In some embodiments, controlling the refrigeration system and the vacuum pump to refrigerate and evacuate the drying chamber includes: controlling the vacuum pump to stop evacuating the cold trap; and controlling the refrigeration system and the vacuum pump to refrigerate and evacuate the drying chamber.

[0014] In some embodiments, the control method further includes: obtaining the dryness of the material in the drying chamber; and when the dryness meets a preset condition, controlling the refrigeration system and the vacuum pump to stop refrigerating and vacuuming the drying chamber.

[0015] In some embodiments, obtaining the dryness of the material in the drying chamber includes: obtaining the vacuum degree in the drying chamber, and determining the dryness of the material according to the vacuum degree.

[0016] In some embodiments, the dryness of the material is determined based on the vacuum degree, including: obtaining the rate of change of the vacuum degree in the drying chamber within a preset time period; wherein, when the rate of change is less than or equal to a preset rate, it is determined that the dryness of the material meets the preset conditions.

[0017] The embodiment of the present disclosure also provides a control device for a freeze dryer, including a processor and a memory storing program instructions, wherein the processor is configured to execute the above-mentioned control method for the freeze dryer when running the program instructions.

[0018] The disclosed embodiment also provides a freeze dryer including: a drying chamber, a cold trap, a refrigeration system, a vacuum pump, a temperature sensor and the above-mentioned control device for the freeze dryer. The drying chamber includes a cavity for storing materials; the cold trap is used to capture water vapor; the vacuum pump is used to evacuate the drying chamber and the cold trap; the refrigeration system is used to refrigerate the drying chamber and the cold trap; the temperature sensor is used to obtain the temperature of the cold trap.

[0019] The control method and device for a freeze dryer and the freeze dryer provided in the embodiments of the present disclosure can achieve the following technical effects:

[0020] The disclosed embodiment provides a control method for a freeze dryer, the freeze dryer comprising: a refrigeration system, a drying chamber, a cold trap, a temperature sensor and a vacuum pump, the refrigeration system is used to refrigerate the drying chamber and the cold trap, the vacuum pump is used to vacuum the drying chamber, and the temperature sensor is used to obtain the temperature in the cold trap; the control method comprises: controlling the refrigeration system to refrigerate the cold trap; obtaining a first temperature T1 in the cold trap; and controlling the refrigeration system and the vacuum pump to refrigerate and vacuum the drying chamber when a preset condition is met; wherein the preset condition comprises that the first temperature T1 is less than or equal to a first temperature threshold. In this way, before the refrigeration system and the vacuum pump refrigerate and vacuum the drying chamber, the refrigeration system can be made to refrigerate the cold trap alone so that the cold trap is quickly reduced to a certain temperature first. At this time, the low-temperature refrigerant in the heat dissipation part can absorb the heat of the element to be radiated to achieve heat dissipation of the element to be radiated. With such a configuration, when the cold trap and the drying chamber are refrigerated simultaneously in the subsequent process, the amount of cooling required by the cold trap can be reduced, thereby avoiding the influence on the refrigeration depth and time of the cold trap.

[0021] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0023] Figure 1 is a structural schematic diagram of a freeze dryer provided in an embodiment of the present disclosure;

[0024] Figure 2 is a structural schematic diagram of another freeze dryer provided in an embodiment of the present disclosure;

[0025] Figure 3 is a structural schematic diagram of another freeze dryer provided in an embodiment of the present disclosure;

[0026] Figure 4is a schematic diagram of a control method for a freeze dryer provided by an embodiment of the present disclosure;

[0027] Figure 5 is a schematic diagram of another control method for a freeze dryer provided by an embodiment of the present disclosure;

[0028] Figure 6 is a schematic diagram of another control method for a freeze dryer provided by an embodiment of the present disclosure;

[0029] Figure 7 is a schematic diagram of another control method for a freeze dryer provided by an embodiment of the present disclosure;

[0030] Figure 8 It is a structural schematic diagram of a control device for a freeze dryer provided in an embodiment of the present disclosure.

[0031] Reference numerals:

[0032] 11: Drying chamber; 12: Cold trap; 13: Refrigeration system; 14: Vacuum pump; 15: Control device; 16: Observation window;

[0033] 501: processor; 502: memory; 503: bus; 504: communication interface. DETAILED DESCRIPTION

[0034] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0035] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0037] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0038] Unless otherwise stated, the term "plurality" means two or more.

[0039] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0040] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0042] When the existing freeze dryer is drying the material in the drying chamber, the drying chamber is generally pre-cooled first, so that the temperature of the drying chamber is deeply reduced and maintained for a period of time, and then the vacuuming stage is entered. At the same time, in the vacuuming stage, the cold trap needs to be cooled first to make the temperature of the cold trap lower than the temperature of the drying chamber, and the drying chamber needs to be continuously cooled during this stage.

[0043] However, the drying chamber and cold trap of the existing freeze dryer generally share a refrigeration system, which results in the drying chamber sharing the cooling capacity of the refrigeration system when the refrigeration system cools the cold trap and the drying chamber at the same time, thereby affecting the refrigeration depth and time of the cold trap.

[0044] like Figures 1 to 8As shown, the embodiment of the present disclosure provides a control method and device for a freeze dryer, and a freeze dryer. Before the freeze dryer formally freezes and dries the material in the drying chamber 11, the cold trap 12 can be cooled separately by the refrigeration system 13 to quickly reduce the cold trap 12 to a lower temperature. In this way, when the cold trap 12 and the drying chamber 11 are cooled simultaneously later, the refrigeration depth and time of the cold trap 12 can be avoided from being affected.

[0045] like Figures 1 to 3 As shown, the embodiment of the present disclosure also provides a freeze dryer including: a drying chamber 11, a cold trap 12, a refrigeration system 13, a vacuum pump 14, a temperature sensor and the above-mentioned control device 15 for the freeze dryer. The drying chamber 11 includes a cavity for storing materials; the cold trap 12 is used to capture water vapor; the vacuum pump 14 is used to evacuate the drying chamber 11 and the cold trap 12; the refrigeration system 13 is used to refrigerate the drying chamber 11 and the cold trap 12; the temperature sensor is used to obtain the temperature of the cold trap 12.

[0046] Specifically, the control device 15 for the freeze dryer is electrically connected to the refrigeration system 13, the vacuum pump 14, and the temperature sensor, respectively, to obtain the temperature information sent by the temperature sensor and control the refrigeration system 13 and the vacuum pump 14. The vacuum pump 14 can evacuate the cavity of the cold trap 12 and the drying chamber 11. The drying chamber 11 is provided with a cavity for storing materials, and the refrigeration system 13 can refrigerate the drying chamber 11. At the same time, the refrigeration system 13 can also refrigerate the cold trap 12 so that the cold trap 12 captures the water vapor in the cavity of the drying chamber 11.

[0047] like Figures 1 to 3 As shown, in some embodiments, the freeze dryer includes: a refrigeration system 13, a drying chamber 11, a cold trap 12, a temperature sensor and a vacuum pump 14, the refrigeration system 13 is used to cool the drying chamber 11 and the cold trap 12, the vacuum pump 14 is used to evacuate the drying chamber 11, and the temperature sensor is used to obtain the temperature in the cold trap 12.

[0048] like Figure 4 As shown, the embodiment of the present disclosure provides a control method for a freeze dryer. The control method includes:

[0049] S101, the control device controls the refrigeration system to refrigerate the cold trap.

[0050] S102, the control device controls the temperature sensor to obtain a first temperature T1 in the cold trap.

[0051] S103, when the preset conditions are met, the control device controls the refrigeration system and the vacuum pump to cool and evacuate the drying chamber.

[0052] The preset condition includes that the first temperature T1 is less than or equal to a first temperature threshold.

[0053] Specifically, the control method for a freeze dryer provided in the present application can first refrigerate the cold trap 12 separately through the refrigeration system 13 before the refrigeration system 13 and the vacuum pump 14 evacuate the drying chamber 11, so that the cold trap 12 is quickly reduced to the first temperature threshold. At this time, the control device 15 controls the refrigeration system 13 to refrigerate the drying chamber 11 at the same time, and controls the vacuum pump 14 to evacuate the drying chamber 11 to freeze-dry the material in the drying chamber 11. It can be seen that since the cold trap 12 has been previously reduced to the first temperature threshold by the refrigeration system 13 before the drying chamber 11 is refrigerated and evacuated, the amount of cold required for the cold trap 12 to drop to the first temperature threshold is smaller when the cold trap 12 and the drying chamber 11 are refrigerated simultaneously later, which can avoid affecting the refrigeration depth and time of the cold trap 12.

[0054] In practical applications, the first temperature threshold is -30°C, that is, when the first temperature T1 is less than or equal to -30°C, the control device 15 controls the refrigeration system 13 and the vacuum pump 14 to refrigerate and evacuate the drying chamber 11. For example, the first temperature T1 may be -30°C, -35°C, -40°C, -45°C or -50°C.

[0055] like Figure 5 As shown, the embodiment of the present disclosure also provides a control method for a freeze dryer, and the vacuum pump of the freeze dryer is also used to evacuate the cold trap. The control method includes:

[0056] S201, the control device controls the refrigeration system to refrigerate the cold trap.

[0057] S202, the control device controls the temperature sensor to obtain a first temperature T1 in the cold trap.

[0058] S203, when the first temperature T1 is less than or equal to the second temperature threshold, the control device controls the vacuum pump to evacuate the cold trap.

[0059] S204, when the preset conditions are met, the control device controls the refrigeration system and the vacuum pump to cool and vacuum the drying chamber.

[0060] The preset condition also includes that the running time of the vacuum pump is greater than or equal to the preset time.

[0061] Specifically, after the first temperature T1 of the cold trap 12 is less than or equal to the second temperature threshold, the control device 15 controls the vacuum pump 14 to evacuate the cold trap 12 to increase the vacuum degree in the cold trap 12. It is understandable that in a closed system, a vacuum environment helps to achieve more efficient refrigeration, that is, more heat can be removed per unit time to achieve rapid refrigeration of the cold trap 12. At the same time, the lower the air pressure in the closed system, the slower the heat dissipation of the system. Therefore, evacuating the cold trap 12 after the first temperature T1 of the cold trap 12 is less than or equal to the second temperature threshold is more conducive to maintaining a low-temperature environment for the cold trap 12, so as to further reduce the subsequent cooling capacity and time required for the cold trap 12 to be refrigerated again.

[0062] In some embodiments, the first temperature T1 is less than or equal to the second temperature threshold, including: the first temperature T1 is less than or equal to -30°C.

[0063] Specifically, the first temperature threshold is -30°C, that is, when the first temperature T1 is less than or equal to -30°C, the control device 15 controls the vacuum pump 14 to evacuate the cold trap 12. For example, the first temperature T1 may be -30°C, -35°C, -40°C, -45°C or -50°C.

[0064] It is understandable that after lowering the first temperature T1 of the cold trap 12 to -30°C, the water in the cold trap 12 can be ensured to freeze, so as to avoid the vacuum pump 14 sucking in water when evacuating the cold trap 12, thereby affecting the performance of the vacuum pump 14.

[0065] In some embodiments, the running time of the vacuum pump 14 being greater than or equal to the preset time includes: the running time of the vacuum pump 14 being greater than or equal to 10 minutes.

[0066] Specifically, the operation time of the vacuum pump 14 can be determined according to factors such as the temperature of the cold trap 12. For example, the operation time of the vacuum pump 14 can be 10 minutes, 20 minutes, 30 minutes, 40 minutes or 50 minutes. After the vacuum pump 14 evacuates the cold trap 12 for 10 minutes, it can be ensured that the cold trap 12 is in a vacuum environment, so as to further reduce the cooling capacity required by the cold trap 12 in the subsequent stage.

[0067] like Figure 6 As shown, the embodiment of the present disclosure also provides a control method for a freeze dryer. The control method includes:

[0068] S301, the control device controls the refrigeration system to refrigerate the cold trap.

[0069] S302, the control device controls the temperature sensor to obtain a first temperature T1 in the cold trap.

[0070] S303, when the first temperature T1 is less than or equal to the second temperature threshold, the control device controls the vacuum pump to evacuate the cold trap.

[0071] S304, when the preset conditions are met, the control device controls the vacuum pump to stop evacuating the cold trap.

[0072] S305, the control device controls the refrigeration system and the vacuum pump to cool and evacuate the drying chamber.

[0073] Specifically, since the material in the drying chamber 11 contains a certain amount of moisture, before the drying chamber 11 is refrigerated and evacuated to freeze-dry the material, the vacuum pump 14 is first stopped to prevent the vacuum pump 14 from drawing in moisture.

[0074] like Figure 6 As shown, in some embodiments, the control method further includes: obtaining the dryness of the material in the drying chamber 11; when the dryness meets the preset conditions, controlling the refrigeration system 13 and the vacuum pump 14 to stop refrigerating and vacuuming the drying chamber 11.

[0075] like Figure 7 As shown, the embodiment of the present disclosure also provides a control method for a freeze dryer. The control method includes:

[0076] S401, the control device controls the refrigeration system to refrigerate the cold trap.

[0077] S402, the control device controls the temperature sensor to obtain a first temperature T1 in the cold trap.

[0078] S403, when the first temperature T1 is less than or equal to the second temperature threshold, the control device controls the vacuum pump to evacuate the cold trap.

[0079] S404, when the preset conditions are met, the control device controls the vacuum pump to stop evacuating the cold trap.

[0080] S405, the control device controls the refrigeration system and the vacuum pump to cool and evacuate the drying chamber.

[0081] S406, the control device obtains the dryness of the material in the drying chamber.

[0082] S407, when the degree of drying meets the preset conditions, the control device controls the refrigeration system and the vacuum pump to stop refrigerating and vacuuming the drying chamber.

[0083] Specifically, a humidity sensor or other detection element may be provided in the drying chamber 11, and the humidity sensor may be used to determine the degree of drying of the material. After the humidity sensor determines that the material has been dried, the control device 15 controls the refrigeration system 13 and the vacuum pump 14 to stop.

[0084] Optionally, the housing is further provided with an observation window 16 made of transparent material such as glass or acrylic, so that the user can directly observe the dryness of the material.

[0085] In some embodiments, obtaining the dryness of the material in the drying chamber 11 includes: obtaining the vacuum degree in the drying chamber 11, and determining the dryness of the material according to the vacuum degree.

[0086] Specifically, a detection element such as a vacuum pressure sensor or a vacuum probe may be disposed in the drying chamber 11 to obtain the vacuum degree in the drying chamber 11 and determine the dryness of the material according to the vacuum degree.

[0087] In some embodiments, the dryness of the material is determined based on the vacuum degree, including: obtaining the rate of change of the vacuum degree in the drying chamber 11 within a preset time period; wherein, when the rate of change is less than or equal to a preset rate, it is determined that the dryness of the material meets the preset conditions.

[0088] Specifically, the control device 15 obtains the change in the vacuum value of the drying chamber 11 within a set time, and if the change meets the requirements, it is determined that the material has been dried. Alternatively, the change rate of the vacuum value of the drying chamber 11 within a set time can be obtained, and if the change rate meets the requirements, it is determined that the material has been dried.

[0089] In some practical applications, the detection element detects the vacuum value in the drying chamber 11, and obtains the rate of change and the total amount of change of the vacuum value in the drying chamber 11 within a preset time. If the rate of change of the vacuum value is greater than the preset rate, or the total amount of change of the vacuum value is greater than the preset threshold. The control device 15 determines that the material is not completely dried. The value of the preset time can be 5min, 10min, 15min or 20min, etc. The value of the preset rate can be 1Pa / min; the value of the preset threshold can be 3Pa, etc. According to the specific situation, the values ​​of the preset time, preset rate, and preset threshold are determined. In this way, by detecting the change of the vacuum value in the drying chamber 11, it can be determined whether the material is completely dried. In this way, in the process of controlling the drying of the material, the degree of dryness of the material can be judged.

[0090] like Figure 8 As shown, the embodiment of the present disclosure also provides a control device 15 for a freeze dryer, including a processor 501 and a memory 502 storing program instructions, and the processor 501 is configured to execute the above-mentioned control method for the freeze dryer when running the program instructions.

[0091] The embodiment of the present disclosure also provides a control device for a freeze dryer, including a processor 501 and a memory 502 storing program instructions, wherein the processor 501 is configured to execute the above-mentioned control method for a freeze dryer when running the program instructions. Optionally, the device may also include a communication interface 504 (Communication Interface) and a bus 503. Among them, the processor 501, the communication interface 504, and the memory 502 can complete mutual communication through the bus 503. The communication interface 504 can be used for information transmission. The processor 501 can call the logic instructions in the memory 502 to execute the control method for a freeze dryer in the above-mentioned embodiment. In addition, the logic instructions in the above-mentioned memory 502 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. The memory 502, as a computer-readable storage medium, can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 501 executes functional applications and data processing by running the program instructions / modules stored in the memory 502, that is, the control method for a freeze dryer in the above-mentioned embodiment is realized. The memory 502 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 502 may include a high-speed random access memory 502, and may also include a non-volatile memory 502. The embodiment of the present disclosure also provides a computer-readable storage medium storing program instructions. When the program instructions are executed, the computer executes the above-mentioned control method for a freeze dryer.

[0092] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A control method for a freeze dryer, characterized in that: The freeze dryer comprises: a refrigeration system, a drying chamber, a cold trap, a temperature sensor and a vacuum pump, wherein the refrigeration system is used to refrigerate the drying chamber and the cold trap, the vacuum pump is used to evacuate the drying chamber, and the temperature sensor is used to obtain the temperature in the cold trap; The control method comprises: Controlling the refrigeration system to refrigerate the cold trap; Obtaining a first temperature T1 in the cold trap; When the preset conditions are met, the refrigeration system and vacuum pump are controlled to cool and evacuate the drying chamber; The preset condition includes that the first temperature T1 is less than or equal to a first temperature threshold.

2. The control method according to claim 1, characterized in that: The vacuum pump is also used to evacuate the cold trap; After obtaining the first temperature T1 in the cold trap, the control method further includes: When the first temperature T1 is less than or equal to the second temperature threshold, controlling the vacuum pump to evacuate the cold trap; The preset condition also includes that the running time of the vacuum pump is greater than or equal to the preset time.

3. The control method according to claim 2, characterized in that: The first temperature T1 is less than or equal to the second temperature threshold, including: The first temperature T1 is less than or equal to -30°C.

4. The control method according to claim 2, characterized in that: The vacuum pump operation time being greater than or equal to the preset time includes: The running time of the vacuum pump is greater than or equal to 10 minutes.

5. The control method according to claim 2, characterized in that: The control of the refrigeration system and the vacuum pump to refrigerate and evacuate the drying chamber includes: Control the vacuum pump to stop evacuating the cold trap; Control the refrigeration system and vacuum pump to cool and evacuate the drying chamber.

6. The control method according to any one of claims 1 to 5, characterized in that: Also includes: Obtain the dryness of the material in the drying chamber; When the degree of drying meets the preset conditions, the refrigeration system and the vacuum pump are controlled to stop refrigerating and vacuuming the drying chamber.

7. The control method according to claim 6, characterized in that: The step of obtaining the dryness degree of the material in the drying chamber comprises: Obtain the vacuum degree in the drying chamber and judge the dryness of the material based on the vacuum degree.

8. The control method according to claim 7, characterized in that: The method of judging the dryness of the material according to the vacuum degree comprises: Obtain the rate of change of vacuum degree in the drying chamber within a preset time period; When the rate of change is less than or equal to a preset rate, it is determined that the dryness of the material meets the preset condition.

9. A control device for a freeze dryer, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the control method for a freeze dryer according to any one of claims 1 to 8 when running the program instructions.

10. A freeze dryer, characterized in that: include: a drying chamber, including a cavity for storing the material; Cold trap, used to capture water vapor; Refrigeration system for cooling the drying chamber and cold trap; A vacuum pump for evacuating the drying chamber and cold trap; A temperature sensor, used to obtain the temperature of the cold trap; and, A control device for a freeze dryer as claimed in claim 9.

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