Quick cooling freeze dryer
By using the parallel design of high-temperature and low-temperature refrigeration systems in the freeze-dryer, and using two heat exchangers to operate separately or simultaneously, the problems of low cooling rate and high energy consumption of the lyophilized refrigeration system are solved, and the further development is achieved Rapid cooling and energy savings.
Patent Information
- Application Number
- CN202323597040.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2033-12-27
AI Technical Summary
The existing lyophilizer cascade refrigeration system has a problem of low cooling rate and high energy consumption.
Design a fast cooling and freeze-dryer, which uses high-temperature and low-temperature refrigeration systems to connect in parallel, and cool the silicone oil through two heat exchangers. When the outlet temperature of the first heat exchanger is higher than a specific value, only high temperature is used. Level refrigeration system; when the temperature is lower than a specific value, the high-temperature and low-temperature refrigeration systems operate simultaneously to match the silicone oil temperature, improve the cooling rate and reduce energy consumption.
A faster cooling rate for the front chassis of freeze-dryer is achieved, which shortens prefreezing time and reduces operating energy consumption.
Smart Images
Figure CN222279039U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of freeze dryers, in particular to a fast cooling freeze dryer. Background Art
[0002] At present, small or experimental freeze dryers generally use cascade refrigeration systems to provide cooling capacity. In the cascade refrigeration system, the high-temperature refrigerant is throttled and then passed through a heat exchanger to cool the low-temperature refrigerant, and the low-temperature refrigerant is throttled and then passed through a heat exchanger to cool the silicone oil.
[0003] However, at a specific evaporation temperature, the cooling capacity of the low temperature stage of the cascade refrigeration system is much smaller than that of the high temperature stage of the cascade refrigeration system. Therefore, at a specific evaporation temperature, the rate at which the silicone oil is cooled by the low temperature stage of the cascade refrigeration system is much slower than that by the high temperature stage, resulting in increased energy consumption. Utility Model Content
[0004] The technical problem to be solved by the utility model is the problem of low refrigeration rate and high energy consumption of the existing cascade refrigeration system of the freeze dryer.
[0005] In order to solve the above technical problems, the technical solution of the utility model is to provide a rapid cooling freeze dryer, including a high-temperature refrigeration system, a low-temperature refrigeration system and a freeze dryer system, wherein the high-temperature refrigeration system, the low-temperature refrigeration system and the freeze dryer system are connected to each other through a connecting pipe, the high-temperature refrigeration system includes a condenser evaporator and a first heat exchanger, the low-temperature refrigeration system includes a low-temperature compressor and a second heat exchanger, and the second heat exchanger is connected to the first heat exchanger, the freeze dryer system includes a front box, and the condenser evaporator, the first heat exchanger, and the second heat exchanger are provided with a plurality of interfaces, wherein,
[0006] The condenser evaporator is connected in parallel with the first heat exchanger, the low temperature stage compressor is connected with the second heat exchanger, the low temperature stage compressor and the second heat exchanger are connected with the condenser evaporator respectively, and the front box is connected with the second heat exchanger and the first heat exchanger respectively.
[0007] Optionally, the high-temperature refrigeration system also includes a high-temperature compressor and a condenser, which are connected in series, and the high-temperature compressor and the first heat exchanger are connected to the same interface of the condenser evaporator, and the condenser and the first heat exchanger are connected to another interface of the condenser evaporator.
[0008] Optionally, a first solenoid valve and a first throttle valve are provided at the interface between the condenser evaporator and the condenser, and a second solenoid valve and a second throttle valve are provided at the interface between the first heat exchanger and the condenser.
[0009] Optionally, a third solenoid valve and a third throttle valve are provided between the second heat exchanger and the condenser evaporator.
[0010] Optionally, the freeze dryer system also includes a rear box, which is connected to the front box. A coil is provided in the rear box, one end of the coil is connected to the low-temperature compressor, and the other end is connected to the connecting pipe between the condenser evaporator and the second heat exchanger.
[0011] Optionally, a fourth solenoid valve and a fourth throttle valve are provided on one end of the coil connected between the condenser evaporator and the second heat exchanger.
[0012] Optionally, a circulation pump is provided on the connecting pipe between the front box and the first heat exchanger.
[0013] Optionally, a temperature detection device is provided on the first heat exchanger.
[0014] To sum up, the utility model is provided with two heat exchangers. When the outlet temperature of the silicone oil side of the first heat exchanger is higher than a certain temperature value, the heat exchange between the silicone oil and the refrigerant can be carried out through the first heat exchanger, that is, only the high-temperature refrigeration system is used for heat exchange. When the outlet temperature of the silicone oil side of the heat exchanger is lower than the above-mentioned specific temperature value, the heat exchange between the silicone oil and the refrigerant can be carried out through the second heat exchanger, that is, the high-temperature refrigeration system and the low-temperature refrigeration system are operated at the same time, which better matches the silicone oil temperature, thereby increasing the cooling rate of the front box of the freeze dryer, shortening the pre-freezing time of the front box, and reducing operating energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the utility model;
[0016] In the figure: 1. high-temperature compressor; 2. condenser; 3. first solenoid valve; 4. first throttle valve; 5. condenser evaporator; 6. low-temperature compressor; 7. third solenoid valve; 8. third throttle valve; 9. second heat exchanger; 10. circulating pump; 11. fourth solenoid valve; 12. fourth throttle valve; 13. front box; 14. rear box; 15. second solenoid valve; 16. second throttle valve; 17. first heat exchanger. DETAILED DESCRIPTION
[0017] The following combination Figure 1 The utility model is described in further detail.
[0018] The utility model discloses a rapid cooling freeze dryer, referring to Figure 1 , including a high-temperature refrigeration system, a low-temperature refrigeration system and a freeze dryer system, wherein the high-temperature refrigeration system, the low-temperature refrigeration system and the freeze dryer system are connected to each other through a connecting pipe;
[0019] Specifically, the high-temperature refrigeration system includes a high-temperature compressor 1, a condenser 2, a condenser-evaporator 5 and a first heat exchanger 17. The condenser-evaporator 5 and the first heat exchanger 17 are each provided with a plurality of interfaces. The condenser-evaporator 5 is connected in parallel with the first heat exchanger 17, and the high-temperature compressor 1 and the condenser 2 are connected in series. The high-temperature compressor 1 and the first heat exchanger 17 are connected at the same interface of the condenser-evaporator 5, and the condenser 2 and the first heat exchanger 17 are connected at another interface of the condenser-evaporator 5.
[0020] The low-temperature refrigeration system includes a low-temperature compressor 6 and a second heat exchanger 9. The second heat exchanger 9 is provided with multiple interfaces. The low-temperature compressor 6 and the second heat exchanger 9 are connected through a connecting pipe. The second heat exchanger 9 is connected to the first heat exchanger 17. The low-temperature compressor 6 and the second heat exchanger 9 are respectively connected to different interfaces on the condenser evaporator 5.
[0021] The freeze dryer system includes a front box 13 and a rear box 14. The rear box 14 is connected to the front box 13. The front box 13 is connected to the interfaces on the second heat exchanger 9 and the first heat exchanger 17 through connecting pipes respectively. A circulating pump 10 is provided on the connecting pipe between the front box 13 and the first heat exchanger 17. A coil is provided in the rear box 14. One end of the coil is connected to the low-temperature compressor 6, and the other end is connected to the connecting pipe between the condenser evaporator 5 and the second heat exchanger 9.
[0022] In a further embodiment, a first solenoid valve 3 and a first throttle valve 4 are provided at the interface between the condenser evaporator 5 and the condenser 2, and a second solenoid valve 15 and a second throttle valve 16 are provided at the interface between the first heat exchanger 17 and the condenser 2; a third solenoid valve 7 and a third throttle valve 8 are provided between the second heat exchanger 9 and the condenser evaporator 5; a fourth solenoid valve 11 and a fourth throttle valve 12 are provided on one end of the coil connected between the condenser evaporator 5 and the second heat exchanger 9, and a temperature detection device is provided on the first heat exchanger 17.
[0023] In the present invention, the plate-level pipeline of the front box 13 is filled with silicone oil, and the silicone oil circulates in the pipeline as a cooling medium to achieve the cooling of the front box 13. The working process is as follows:
[0024] First, the outlet temperature threshold of the silicone oil side of the first heat exchanger 17 is set, for example, -40°C. When the front box 13 is cooled, the circulating pump 10 is started, and the refrigeration system is started. If the silicone oil outlet temperature of the first heat exchanger 17 is higher than the threshold at this time, the high-temperature compressor 1 is turned on, the second solenoid valve 15 is opened, the first solenoid valve 3 is closed, and the circulating pump 10 is turned on. The high-temperature refrigerant is cooled by the condenser 2 and passes through the second solenoid valve 15. After being throttled by the second throttle valve 16, it exchanges heat with the silicone oil in the first heat exchanger 17. The silicone oil temperature gradually decreases, thereby cooling the plate layer inside the front box 13.
[0025] If the silicone oil outlet temperature of the first heat exchanger 17 is lower than the threshold value, the high-temperature compressor 1 and the low-temperature compressor 6 are turned on, the first solenoid valve 3 is opened, the second solenoid valve 15 is closed, the third solenoid valve 7 is opened, and the circulating pump 10 is turned on. The high-temperature refrigerant passes through the first solenoid valve 3, and is throttled by the first throttle valve 4 before cooling the low-temperature refrigerant in the condenser evaporator 5. The cooled low-temperature refrigerant passes through the third solenoid valve 7, and is throttled by the third throttle valve 8 before cooling the silicone oil in the second heat exchanger 9, so that the silicone oil temperature is further reduced, thereby reducing the plate layer temperature inside the front box 13 to a lower level.
[0026] The utility model is used for refrigeration at a specific evaporation temperature, and two heat exchangers are arranged. When the outlet temperature of the silicone oil side of the first heat exchanger 17 is higher than a certain temperature value, the heat exchange between the silicone oil and the refrigerant can be carried out through the first heat exchanger 17, that is, only the high-temperature refrigeration system is used for heat exchange to meet the requirements, and there is no need to cool the low-temperature refrigerant in advance. When the outlet of the silicone oil side of the heat exchanger is lower than the above-mentioned specific temperature value, the temperature difference between the high-temperature refrigerant and the silicone oil is small at this time, and the heat exchange between the silicone oil and the refrigerant can be carried out through the second heat exchanger 9, that is, the high-temperature refrigeration system and the low-temperature refrigeration system are operated at the same time, resulting in a larger temperature difference, which can better match the silicone oil temperature, achieve rapid cooling, and reduce unnecessary energy consumption, saving energy costs.
[0027] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A rapid cooling freeze dryer, characterized in that: The invention comprises a high-temperature refrigeration system, a low-temperature refrigeration system and a freeze dryer system, wherein the high-temperature refrigeration system, the low-temperature refrigeration system and the freeze dryer system are connected to each other via a connecting pipe, the high-temperature refrigeration system comprises a condenser evaporator (5) and a first heat exchanger (17), the low-temperature refrigeration system comprises a low-temperature compressor (6) and a second heat exchanger (9), and the second heat exchanger (9) is connected to the first heat exchanger (17), the freeze dryer system comprises a front box (13), and the condenser evaporator (5), the first heat exchanger (17) and the second heat exchanger (9) are all provided with a plurality of interfaces, wherein: The condenser evaporator (5) is connected in parallel with the first heat exchanger (17), the low-temperature stage compressor (6) is connected with the second heat exchanger (9), the low-temperature stage compressor (6) and the second heat exchanger (9) are respectively connected with the condenser evaporator (5), and the front box (13) is respectively connected with the second heat exchanger (9) and the first heat exchanger (17).
2. The rapid cooling freeze dryer according to claim 1, characterized in that: The high-temperature refrigeration system further comprises a high-temperature compressor (1) and a condenser (2), wherein the high-temperature compressor (1) and the condenser (2) are connected in series, and the high-temperature compressor (1) and the first heat exchanger (17) are connected to the same interface of the condenser evaporator (5), and the condenser (2) and the first heat exchanger (17) are connected to another interface of the condenser evaporator (5).
3. The rapid cooling freeze dryer according to claim 2, characterized in that: A first solenoid valve (3) and a first throttle valve (4) are provided at the interface where the condenser evaporator (5) is connected to the condenser (2), and a second solenoid valve (15) and a second throttle valve (16) are provided at the interface where the first heat exchanger (17) is connected to the condenser (2).
4. The rapid cooling freeze dryer according to claim 2, characterized in that: A third solenoid valve (7) and a third throttle valve (8) are provided between the second heat exchanger (9) and the condenser evaporator (5).
5. The rapid cooling freeze dryer according to claim 2, characterized in that: The freeze dryer system further comprises a rear box (14), the rear box (14) being connected to the front box (13), a coil being arranged in the rear box (14), one end of the coil being connected to the low temperature compressor (6), and the other end being connected to the connecting pipe between the condenser evaporator (5) and the second heat exchanger (9).
6. The rapid cooling freeze dryer according to claim 5, characterized in that: A fourth solenoid valve (11) and a fourth throttle valve (12) are provided on one end of the coil connected between the condenser evaporator (5) and the second heat exchanger (9).
7. The rapid cooling freeze dryer according to claim 2, characterized in that: A circulation pump (10) is provided on the connecting pipe between the front box (13) and the first heat exchanger (17).
8. The rapid cooling freeze dryer according to claim 1, characterized in that: The first heat exchanger (17) is provided with a temperature detection device.