CN210638378U - Double-circuit refrigerating device of overlapping partition plate freeze dryer - Google Patents
Double-circuit refrigerating device of overlapping partition plate freeze dryer Download PDFInfo
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- CN210638378U CN210638378U CN201921786308.8U CN201921786308U CN210638378U CN 210638378 U CN210638378 U CN 210638378U CN 201921786308 U CN201921786308 U CN 201921786308U CN 210638378 U CN210638378 U CN 210638378U
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Abstract
The utility model discloses a cascade baffle freeze dryer double-circuit refrigerating plant belongs to freeze dryer temperature control device technical field. The two-way temperature control device comprises a pre-cooling unit, a refrigerating unit and a freeze-drying bin, wherein the pre-cooling unit is used for pre-cooling or refrigerating the refrigerating unit, and the refrigerating unit is used for refrigerating the freeze-drying bin. The refrigeration unit comprises a low-pressure compressor, a condenser, a plate heat exchanger II and a plate heat exchanger I which are sequentially communicated through a connecting pipe. The precooling unit comprises a high-pressure compressor, a condenser and a plate heat exchanger II which are sequentially communicated through a connecting pipe. And a third electromagnetic valve and a second electromagnetic valve are respectively arranged on connecting pipes between the second plate heat exchanger and the first plate heat exchanger and the cold trap. And a first branch pipe and a second branch pipe which are connected in parallel and are respectively provided with a fifth electromagnetic valve and a fourth electromagnetic valve are arranged between the third electromagnetic valve and the first plate heat exchanger. The utility model adopts the above structure overlapping baffle freeze dryer double-circuit refrigerating plant can solve the freeze dryer refrigeration inefficiency, the big problem of cold-trap temperature rise again.
Description
Technical Field
The utility model belongs to the technical field of the temperature control device technique of freeze dryer and specifically relates to a double-circuit temperature control device of overlapping baffle freeze dryer is related to.
Background
A freeze dryer is a method of freezing a water-containing substance into a solid state and then sublimating water from the solid state into a gaseous state to remove water and preserve the substance. The freeze dryer is dried at low temperature, does not deform protein, but can lose biological activity of microorganisms and the like, and is particularly suitable for bioactive products, biochemical products, genetic engineering products, blood products and the like with poor thermal stability.
The baffle type freeze dryer is characterized in that a plurality of baffles are placed in a freeze drying bin, materials are placed on the baffles, a silicon oil pipe is fixed on the baffles, and heat exchange is carried out between heat dissipation medium silicon oil in the silicon oil pipe and the freeze drying bin, so that each baffle can be uniformly cooled. The freeze dryer is also provided with a cold trap, and the cold trap absorbs water vapor in the freeze drying bin by physical adsorption through refrigeration. The cold trap and the freeze-drying bin of the existing freeze dryer share one set of cooling device for cooling, and when the cooling device controls the temperature of the freeze-drying bin, the cold supply in the cold trap is insufficient, so that the temperature of the cold trap rises greatly. In addition, when one set of refrigerating device is adopted for refrigerating, the refrigerating efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cascade baffle freeze dryer double-circuit refrigerating plant solves the freeze dryer refrigeration inefficiency, the big problem of cold-trap temperature rise again.
In order to achieve the purpose, the utility model provides a double-path refrigerating device of a overlapping baffle freeze dryer, which comprises a precooling unit, a refrigerating unit and a freeze-drying bin, wherein the precooling unit precools or refrigerates the refrigerating unit, and the refrigerating unit refrigerates the freeze-drying bin;
the refrigeration unit comprises a low-pressure compressor, a condenser, a plate heat exchanger II and a plate heat exchanger I, the low-pressure compressor is communicated with the condenser through a connecting pipe, an oil-gas separator is arranged on the connecting pipe between the low-pressure compressor and the condenser, the condenser is communicated with the plate heat exchanger II through the connecting pipe II, the plate heat exchanger II is communicated with the plate heat exchanger I through a connecting pipe III, an expansion valve III is arranged on the connecting pipe III, the plate heat exchanger I is communicated with the low-pressure compressor through the connecting pipe, and a gas separator is arranged on the connecting pipe between the plate heat exchanger I and the low-pressure compressor; the first plate heat exchanger is in circulating connection with the freeze-drying bin through a silicon oil pipe, a circulating pump is arranged on the silicon oil pipe between the first plate heat exchanger and the freeze-drying bin, and heat exchange is carried out between silicon oil in the silicon oil pipe and a refrigerant in the refrigeration unit in the first plate heat exchanger;
the plate heat exchanger II is communicated with the cold trap through a connecting pipe IV, an expansion valve II is arranged on the connecting pipe IV, the cold trap is communicated with the low-pressure compressor through a connecting pipe, and a gas separator is arranged on the connecting pipe between the cold trap and the low-pressure compressor;
a first branch pipe and a second branch pipe which are connected in parallel are arranged on a third connecting pipe between the third expansion valve and the first plate heat exchanger, the first branch pipe and the second branch pipe are both communicated with the third connecting pipe, the inner diameter of the first branch pipe is larger than that of the second branch pipe, a fifth electromagnetic valve is arranged on the first branch pipe, and a fourth electromagnetic valve is arranged on the second branch pipe.
Furthermore, the precooling unit comprises a high-pressure compressor, a condenser and a plate heat exchanger II, the high-pressure compressor is communicated with the condenser through a connecting pipe, the condenser is communicated with the plate heat exchanger II through a connecting pipe I, the plate heat exchanger II is communicated with the high-pressure compressor through a connecting pipe, a filter II, an electromagnetic valve I and an expansion valve I are sequentially arranged on the connecting pipe I from the condenser to the plate heat exchanger II, and refrigerant in the refrigerating unit and refrigerant in the precooling unit exchange heat in the plate heat exchanger II.
Furthermore, a third electromagnetic valve is arranged between the third expansion valve and the second plate heat exchanger on the third connecting pipe, and a second electromagnetic valve is arranged between the second expansion valve and the second plate heat exchanger on the fourth connecting pipe.
Furthermore, a first filter is arranged on the second connecting pipe.
The utility model discloses an opening and closing of electric solenoid valve two and solenoid valve three realize cooling alone or simultaneously to freeze-drying storehouse and cold-trap. During refrigeration, the high-pressure compressor is started firstly, the refrigerant in the refrigeration unit is precooled by the refrigerant in the precooling unit in the plate type heat exchanger II, then the high-pressure compressor and the low-pressure compressor run simultaneously, the refrigerant in the precooling unit further refrigerates the refrigerant in the refrigeration unit, then the refrigerant in the refrigeration unit exchanges heat with silicon oil in the plate type heat exchanger I, and then exchanges heat with the freeze-drying bin through the silicon oil, so that the cooling efficiency is improved.
The third connecting pipe is provided with a first branch pipe and a second branch pipe which are connected in parallel, the inner diameter of the first branch pipe is larger than that of the second branch pipe, and the first branch pipe and the second branch pipe are respectively provided with a fifth electromagnetic valve and a fourth electromagnetic valve. When the freeze-drying chamber needs most of cold quantity in the temperature control stage or the cold trap, the fifth electromagnetic valve is closed, the fourth electromagnetic valve is opened, and the second branch pipe with small inner diameter is opened, so that the cold quantity flowing into the freeze-drying chamber is reduced, the cold quantity flowing into the cold trap is improved, and the poor water vapor capture effect caused by large temperature rise in the cold trap is avoided. And in the precooling stage of the freeze-drying bin, opening the solenoid valve five, closing the solenoid valve four, and opening the branch pipe two with the large inner diameter so that most of cold energy flows into the freeze-drying bin. And the fourth electromagnetic valve and the fifth electromagnetic valve are switched according to requirements, so that the energy consumption is reduced, and the refrigeration efficiency is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a double-path refrigerating device of a freeze dryer with overlapped partition plates.
Reference numerals
1. A first connecting pipe; 2. a second connecting pipe; 3. a third connecting pipe; 4. a fourth connecting pipe; 5. a first branch pipe; 6. and a second branch pipe.
Detailed Description
Examples
Fig. 1 is a schematic structural diagram of an embodiment of a double-path refrigerating device of a freeze dryer with overlapped partition plates. As shown in the figure, the double-path refrigerating device of the overlapping partition plate freeze dryer comprises a pre-cooling unit, a refrigerating unit and a freeze-drying bin, wherein the pre-cooling unit pre-cools a refrigerating unit, and the refrigerating unit refrigerates the freeze-drying bin. The precooling unit comprises a high-pressure compressor, a condenser and a plate heat exchanger II. The high-pressure compressor is communicated with the condenser through a connecting pipe, the condenser is communicated with the plate heat exchanger II through a connecting pipe I1, and the plate heat exchanger II is communicated with the high-pressure compressor through a connecting pipe. The first connecting pipe 1 is sequentially provided with a first filter, a first electromagnetic valve and a first expansion valve from the condenser to the second plate heat exchanger, the first electromagnetic valve is used for controlling opening and closing of the first connecting pipe 1, and the first expansion valve is used for adjusting the pressure of the liquid refrigerant in the first connecting pipe 1.
The refrigeration unit comprises a low-pressure compressor, a condenser, a plate type heat exchanger II and a plate type heat exchanger I. The low-pressure compressor is communicated with the condenser through the connecting pipe, the oil-gas separator is arranged on the connecting pipe, the oil-gas separator collects liquid gasoline mixed in gas and then sends the liquid gasoline into the low-pressure compressor for recycling, and the oil consumption of the air compressor is reduced. The oil-gas separator is of an existing structure, a commercially available product can meet the requirement, and the structure of the oil-gas separator is not the key point of the application and is not described in detail herein. The condenser is communicated with the second plate heat exchanger through a second connecting pipe 2, a first filter is arranged on the second connecting pipe 2, and the first filter has a filtering effect on liquid refrigerants.
The second plate heat exchanger is communicated with the first plate heat exchanger through a third connecting pipe 3, a third electromagnetic valve and a third expansion valve are arranged on the third connecting pipe 3, the third electromagnetic valve is used for controlling the third connecting pipe 3 to be opened and closed, and the third expansion valve is used for adjusting the pressure of the liquid refrigerant in the third connecting pipe 3. And a first branch pipe 5 and a second branch pipe 6 which are connected in parallel are arranged on a third connecting pipe 3 between the third expansion valve and the first plate heat exchanger, and the first branch pipe 5 and the second branch pipe 6 are both communicated with the third connecting pipe 3. The inner diameter of the branch pipe I5 is larger than that of the branch pipe II 6, the solenoid valve V is arranged on the branch pipe I5, and the solenoid valve IV is arranged on the branch pipe II 6. Through the switching of the electromagnetic valve five and the electromagnetic valve four, the flow rate of the refrigerant flowing into the plate heat exchanger I can be controlled, and therefore the cold quantity supplied to the freeze-drying bin is adjusted. And the first plate heat exchanger is communicated with the low-pressure compressor through a connecting pipe, and a gas separator is arranged on the connecting pipe. The gas separator is used for separating gaseous refrigerant and liquid refrigerant.
The first plate type heat exchanger is in circulating connection with the freeze-drying bin through a silicon oil pipe, and a circulating pump is arranged on the silicon oil pipe. The silicone oil in the silicone oil pipe exchanges heat with the refrigerant in the plate heat exchanger I, the silicone oil pipe is uniformly distributed on the partition plate of the freeze-drying bin, the silicone oil pipe is filled with the silicone oil, and the silicone oil is used as a heat transfer medium to exchange heat with the material on the partition plate, so that the temperature of the material is uniformly reduced. The circulating pump provides power for the circulation of the silicone oil.
The low-pressure compressor and the high-pressure compressor are respectively communicated with the plate heat exchanger II through the connecting pipe II 2 and the connecting pipe I1, namely, one of two pipelines in the plate heat exchanger II is filled with a refrigerant of the pre-cooling unit, the other pipeline is filled with a refrigerant of the refrigerating unit, the refrigerant of the pre-cooling unit pre-cools or further refrigerates the refrigerant of the refrigerating unit, and refrigerating efficiency is improved.
The second plate heat exchanger is communicated with the cold trap through a fourth connecting pipe 4, and a second electromagnetic valve and a second expansion valve are arranged on the fourth connecting pipe 4. The second electromagnetic valve is used for controlling the opening and closing of the connecting pipe IV 4, and the second expansion valve is used for adjusting the pressure of the liquid refrigerant on the connecting pipe IV 4. The cold trap is communicated with the low-pressure compressor through a connecting pipe, and a gas separator is arranged on the connecting pipe. The gas separator is used for separating liquid refrigerant mixed in the gaseous refrigerant and preventing the liquid refrigerant from entering the compressor. The gas separator is a conventional technology, and the structure thereof will not be described again. The cold trap is connected with the freeze-drying bin through a connecting pipeline and is used for absorbing sublimed water vapor in the freeze-drying bin. The cold trap is cooled under the action of the refrigerant, and the water vapor from the freeze drying bin is condensed into frost on the wall of the cold trap to capture the water vapor.
Through the switching of the second electromagnetic valve and the third electromagnetic valve, the independent refrigeration or the simultaneous refrigeration of the cold trap and the freeze-drying bin can be realized.
The refrigerant in the pre-cooling unit and the refrigerant in the refrigeration unit have different boiling points, and the refrigerant in the pre-cooling unit has a higher boiling point.
The temperature control device of the utility model has four circulation states, during the precooling, only start the high-pressure compressor, the gaseous state refrigerant after the high-pressure compressor will compress is sent into the condenser, the condenser changes the gaseous state refrigerant into the liquid state refrigerant, then flow into the second plate heat exchanger through the first connecting pipe 1, the refrigerant of the refrigerating unit and the refrigerant of the precooling unit carry out the heat exchange in the second plate heat exchanger, carry out the precooling to the refrigerant of the refrigerating unit, the liquid state refrigerant heat absorption of the precooling unit becomes the gaseous state refrigerant, then form a circulation through the connecting pipe entering high-pressure compressor; and circulating in this way.
When the cold trap is refrigerated, the second electromagnetic valve is opened, the low-pressure compressor is started, the low-pressure compressor and the high-pressure compressor run simultaneously, the low-pressure compressor sends compressed gaseous refrigerants into the condenser, the condenser converts the gaseous refrigerants into liquid refrigerants, the liquid refrigerants flow into the second plate heat exchanger through the second connecting pipe 2, the refrigerants of the refrigerating unit are further refrigerated by the pre-cooling unit in the second plate heat exchanger, then the liquid refrigerants enter the cold trap through the second electromagnetic valve and the second expansion valve, the cold trap is refrigerated, the heat-exchanged refrigerants enter the low-pressure compressor through the connecting pipe and the gas separator, a cycle is formed, and the cycle is carried out accordingly.
When the freeze-drying bin is refrigerated, the electromagnetic valve III is opened, the low-pressure compressor is started, the low-pressure compressor and the high-pressure compressor run simultaneously, the low-pressure compressor sends compressed gaseous refrigerants into the condenser, the condenser converts the gaseous refrigerants into liquid refrigerants, the liquid refrigerants flow into the plate heat exchanger II through the connecting pipe II 2, the refrigerants of the refrigeration unit are further refrigerated by the refrigerants of the precooling unit in the plate heat exchanger II, and then the liquid refrigerants flow into the plate heat exchanger I through the electromagnetic valve III and the expansion valve III and the connecting pipe III 3. When the refrigerant flows in the third 3 connecting pipes, the fourth electromagnetic valve or the fifth electromagnetic valve is selectively opened as required, the liquid refrigerant of the refrigerating unit exchanges heat with silicon oil in the silicon oil pipe in the first plate heat exchanger, the silicon oil enters the freeze-drying bin to refrigerate the material, the mixed refrigerant after heat exchange enters the gas separator to be separated, and then the mixed refrigerant is sent into the low-pressure compressor to form a cycle, and the cycle is performed according to the cycle.
When the freeze-drying chamber is in the temperature control stage or most of cold energy is needed to be supplied to the cold trap for use, the fifth electromagnetic valve is closed, and the fourth electromagnetic valve is opened, so that most of cold energy flows into the cold trap. When the freeze dryer is in a precooling stage, the fifth electromagnetic valve is opened, and the fourth electromagnetic valve is closed, so that most of cold energy flows into the freeze drying bin, the cooling efficiency is improved, the energy utilization rate is improved, and the energy consumption is reduced.
The independent cooling or the simultaneous cooling of the freeze-drying bin and the cold trap can be realized by opening and closing the second electromagnetic valve and the third electromagnetic valve, the temperature reduction of the freeze-drying bin and the cold trap can be realized by adopting one compressor, and the energy consumption is reduced. The refrigerant of the refrigeration unit is pre-cooled or further refrigerated by the high-pressure compressor and the plate heat exchanger, so that the cooling efficiency is improved.
The commercial products of the solenoid valve, the expansion valve and the filter can meet the use requirements, the structure of the solenoid valve, the expansion valve and the filter is not the key point of the application, and the structure of the solenoid valve, the expansion valve and the filter is not repeated.
Therefore, the utility model adopts the above structure overlapping baffle freeze dryer double-circuit refrigerating plant can solve the problem that freeze dryer refrigeration efficiency is low, and cold-trap temperature rises again greatly.
The above are specific embodiments of the present invention, but the scope of protection of the present invention should not be limited thereto. Any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention are covered by the protection scope of the present invention, and therefore, the protection scope of the present invention is subject to the protection scope defined by the claims.
Claims (4)
1. The utility model provides a cascade baffle freeze dryer double-circuit refrigerating plant which characterized in that: the refrigeration system comprises a pre-cooling unit, a refrigeration unit and a freeze-drying bin, wherein the pre-cooling unit is used for pre-cooling or refrigerating a refrigeration unit, and the refrigeration unit is used for refrigerating the freeze-drying bin;
the refrigeration unit comprises a low-pressure compressor, a condenser, a plate heat exchanger II and a plate heat exchanger I, the low-pressure compressor is communicated with the condenser through a connecting pipe, an oil-gas separator is arranged on the connecting pipe between the low-pressure compressor and the condenser, the condenser is communicated with the plate heat exchanger II through a connecting pipe II (2), the plate heat exchanger II is communicated with the plate heat exchanger I through a connecting pipe III (3), an expansion valve III is arranged on the connecting pipe III (3), the plate heat exchanger I is communicated with the low-pressure compressor through the connecting pipe, and a gas separator is arranged on the connecting pipe between the plate heat exchanger I and the low-pressure compressor; the first plate heat exchanger is in circulating connection with the freeze-drying bin through a silicon oil pipe, a circulating pump is arranged on the silicon oil pipe between the first plate heat exchanger and the freeze-drying bin, and heat exchange is carried out between silicon oil in the silicon oil pipe and a refrigerant in the refrigeration unit in the first plate heat exchanger;
the plate heat exchanger II is communicated with the cold trap through a connecting pipe IV (4), an expansion valve II is arranged on the connecting pipe IV (4), the cold trap is communicated with the low-pressure compressor through the connecting pipe, and a gas separator is arranged on the connecting pipe between the cold trap and the low-pressure compressor;
a first branch pipe (5) and a second branch pipe (6) which are connected in parallel are arranged on a third connecting pipe (3) between the third expansion valve and the first plate heat exchanger, the first branch pipe (5) and the second branch pipe (6) are communicated with the third connecting pipe (3), the inner diameter of the first branch pipe (5) is larger than that of the second branch pipe (6), a fifth electromagnetic valve is arranged on the first branch pipe (5), and a fourth electromagnetic valve is arranged on the second branch pipe (6).
2. The double-circuit refrigerating device of the overlapping partition plate freeze dryer according to claim 1, characterized in that: the precooling unit comprises a high-pressure compressor, a condenser and a plate heat exchanger II, the high-pressure compressor is communicated with the condenser through a connecting pipe, the condenser is communicated with the plate heat exchanger II through a connecting pipe I (1), the plate heat exchanger II is communicated with the high-pressure compressor through a connecting pipe, a filter II, a solenoid valve I and an expansion valve I are sequentially arranged on the connecting pipe I (1) from the condenser to the plate heat exchanger II, and refrigerant in the refrigerating unit and refrigerant in the precooling unit exchange heat in the plate heat exchanger II.
3. The double-circuit refrigerating device of the overlapping partition plate freeze dryer according to claim 1, characterized in that: and a third electromagnetic valve is arranged between the third expansion valve and the second plate heat exchanger on the third connecting pipe (3), and a second electromagnetic valve is arranged between the second expansion valve and the second plate heat exchanger on the fourth connecting pipe (4).
4. The double-circuit refrigerating device of the overlapping partition plate freeze dryer according to claim 1, characterized in that: and a first filter is arranged on the second connecting pipe (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921786308.8U CN210638378U (en) | 2019-10-23 | 2019-10-23 | Double-circuit refrigerating device of overlapping partition plate freeze dryer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921786308.8U CN210638378U (en) | 2019-10-23 | 2019-10-23 | Double-circuit refrigerating device of overlapping partition plate freeze dryer |
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| CN210638378U true CN210638378U (en) | 2020-05-29 |
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| CN201921786308.8U Active CN210638378U (en) | 2019-10-23 | 2019-10-23 | Double-circuit refrigerating device of overlapping partition plate freeze dryer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143737A (en) * | 2022-07-24 | 2022-10-04 | 北京四环起航科技有限公司 | A novel automatic freeze dryer that is used for a small amount of sample freeze drying in laboratory |
-
2019
- 2019-10-23 CN CN201921786308.8U patent/CN210638378U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143737A (en) * | 2022-07-24 | 2022-10-04 | 北京四环起航科技有限公司 | A novel automatic freeze dryer that is used for a small amount of sample freeze drying in laboratory |
| CN115143737B (en) * | 2022-07-24 | 2024-03-22 | 北京四环起航科技有限公司 | Novel automatic freeze dryer for freeze drying of small amount of samples in laboratory |
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