CN211552166U - Ultralow temperature refrigerator capable of operating all year round in high-temperature environment - Google Patents
Ultralow temperature refrigerator capable of operating all year round in high-temperature environment Download PDFInfo
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- CN211552166U CN211552166U CN202020120090.9U CN202020120090U CN211552166U CN 211552166 U CN211552166 U CN 211552166U CN 202020120090 U CN202020120090 U CN 202020120090U CN 211552166 U CN211552166 U CN 211552166U
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Abstract
The utility model discloses an ultra-low temperature freezer of high temperature environment operation all year round, its structure includes compressor, oil separator, air-cooled condenser, water-cooling auxiliary condenser, drier-filter, subcooler, vapour and liquid separator, middle heat exchanger, expansion valve, main expansion valve and evaporimeter. The utility model has the advantages that: the structure is compact and reasonable, the operation and the use are convenient, and the ultralow temperature of-150 ℃ in the freezer can be realized; under the condition of higher environment temperature, the requirement of refrigeration in summer in a high-temperature area is met; the water cooling auxiliary function is closed under the condition of low temperature, the risk of frost crack of the condenser is avoided, the condensing temperature is easy to adjust, the rotating speed of the condensing fan is controlled through the condensing pressure, and normal refrigeration can be realized under the low environment; the multi-point operation and model-free self-tree-building algorithm can be adopted, and the temperature control of a large-lag system is specially aimed at, so that the temperature of a lag target value can be controlled within +/-0.5 ℃ in a constant temperature manner.
Description
Technical Field
The utility model relates to an ultra-low temperature freezer that moves all year round under the high temperature environment.
Background
In areas with higher temperature in summer, the refrigerating unit adopting the air-cooled condenser has the defects that the refrigerating efficiency is very low due to overhigh condensing temperature, the temperature is difficult to drop for low-temperature equipment, and the compressor is often burnt out due to long-time high-load work. Therefore, water-cooled condensers are adopted by a plurality of manufacturers in many times, the water-cooled condensers have many working advantages in summer but have many troubles, and pure water-cooled condensers need to be matched with a whole set of cooling facilities comprising a cooling tower, a circulating pump, a water replenishing pump, a circulating pipeline, a filter, a valve and the like, so that the early investment is large, the later maintenance cost is high, the occupied area is large, and the cost is not high for small-sized equipment. In winter, because the temperature is lower, if cooling water flow can not be effectively adjusted, the condensing pressure of the refrigerating system is too low, so that the whole refrigerating system is low-pressure to alarm, and the normal work can not be realized. When the refrigerating unit does not operate for a long time, the cooling water stops circulating, and if the cooling water accumulated in the circulating pipeline and the condenser cannot be discharged in time or the cooling water cannot be discharged thoroughly, ice is formed in the cooling water, so that the condenser and the circulating pipeline are cracked, and finally serious economic loss cannot be recovered.
There are many ways to create an ultra-low temperature environment, but the most common way to use is a vapor compression refrigeration, and compared with other refrigeration ways, the refrigeration system has the advantages of high efficiency, low use cost, simple manufacture, high automation degree and the like. The vapor compression refrigeration in the prior art usually adopts a multi-machine matched mode, and comprises two or more refrigeration systems which are divided into a low-temperature stage and a high-temperature stage, wherein the low-temperature stage and the high-temperature stage are connected by a group of evaporative condensers, a liquid refrigerant of the high-temperature stage evaporates and absorbs heat in the evaporative condensers, a gaseous refrigerant of the low-temperature stage releases heat in the evaporative condensers and condenses into liquid, and then the liquid refrigerant enters a low-temperature stage evaporator to evaporate, so that the ultralow temperature refrigeration is realized. The volume of the whole equipment is too large due to the multiple groups of refrigeration systems, the manufacturing cost is doubled due to the multiple refrigeration parts, and the reliability of the system is difficult to guarantee due to the excessive moving parts.
SUMMERY OF THE UTILITY MODEL
The utility model provides an ultra-low temperature freezer that high temperature environment was gone through year down, its purpose aims at overcoming the above-mentioned not enough that prior art exists, realizes high reliability and high energy efficiency ratio, saves earlier stage input and later maintenance cost for the user.
The technical solution of the utility model is as follows: the structure of the ultra-low temperature freezer running all year round in the high temperature environment comprises a compressor, an oil separator, an air-cooled condenser, a water-cooled auxiliary condenser, a drying filter, a subcooler, a gas-liquid separator, an intermediate heat exchanger, an expansion valve, a main expansion valve and an evaporator, wherein the compressor is respectively connected with the top and the bottom of the oil separator through pipelines, the oil separator is connected with the air-cooled condenser through a pipeline, the air-cooled condenser is connected with a first passage of the water-cooled auxiliary condenser through a pipeline, a first passage of the water-cooled auxiliary condenser is connected with the drying filter through a pipeline, a second passage of the water-cooled auxiliary condenser is respectively connected with a cooling water outlet pipe and a cooling water inlet pipe, the drying filter is connected with a first passage of the subcooler through a pipeline with a liquid lens, the first passage of the subcooler is, The bottom of the intermediate heat exchanger is connected with a second passage of the intermediate heat exchanger through a pipeline with an expansion valve, the second passage of the intermediate heat exchanger is connected with a second passage of the subcooler through a pipeline, the second passage of the subcooler is connected with the compressor through a pipeline, the first passage of the intermediate heat exchanger is connected with the evaporator through a pipeline with a main expansion valve, the evaporator is connected with a pipeline between the expansion valve and the second passage of the intermediate heat exchanger through a pipeline, and the bottom of the evaporator is connected with a condensed water pipeline.
Preferably, the gas-liquid separator, the intermediate heat exchanger and the expansion valve are all three sets connected in series.
Preferably, the system also comprises a buffer tank, the bottom of the buffer tank is connected with a pipeline between the drying filter and the subcooler through a pipeline with an angle valve and a load relief valve, and the bottom of the buffer tank is connected with a pipeline between the subcooler and the compressor through a pipeline with an angle valve and a throttling capillary tube.
Preferably, an oil-filling high-pressure meter is arranged on a pipeline between the compressor and the oil separator, an oil-filling low-pressure meter is arranged on a pipeline between the subcooler and the compressor, and the pipeline between the compressor and the oil separator and the pipeline between the subcooler and the compressor are connected with the high-low pressure controller.
Preferably, an ambient temperature sensor is arranged on the air inlet side of the air-cooled condenser.
The utility model has the advantages that: 1) the structure is compact and reasonable, the operation and the use are convenient, and the ultralow temperature of-150 ℃ in the freezer can be realized;
2) the high-temperature water-cooling auxiliary function is added, under the condition of higher environment temperature, the condensing efficiency of the air-cooled condenser is linearly reduced, the complete liquefaction of high-temperature and high-pressure refrigerant gas cannot be ensured, so that the refrigerating efficiency is greatly reduced, and the normal refrigerating requirement cannot be met;
3) the water cooling auxiliary function is closed under the condition of low temperature, the risk of frost crack of the condenser is avoided, the condensing temperature is easy to adjust, the rotating speed of the condensing fan is controlled through the condensing pressure, and normal refrigeration can be realized under the low environment;
4) the multi-point operation and model-free self-tree-building algorithm can be adopted, and the temperature control of a large-lag system is specially aimed at, so that the temperature of a lag target value can be controlled within +/-0.5 ℃ in a constant temperature manner, and the up-down frequent fluctuation is avoided.
Drawings
Fig. 1 is a schematic structural view of an ultra-low temperature freezer of the utility model operating all year round in a high temperature environment.
In the figure, 1 is a buffer tank, 101 is a relief valve, 102 is a throttle capillary tube, 2 is a compressor, 3 is an oil separator, 4 is an air-cooled condenser, 5 is a water-cooled auxiliary condenser, 6 is a drying filter, 7 is a subcooler, 8 is a gas-liquid separator, 9 is an intermediate heat exchanger, 10 is an expansion valve, 11 is a main expansion valve, and 12 is an evaporator.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments.
As shown in figure 1, the ultra-low temperature freezer running in high temperature environment all year round structurally comprises a compressor 2, an oil separator 3, an air-cooled condenser 4, a water-cooled auxiliary condenser 5, a drying filter 6, a subcooler 7, a gas-liquid separator 8, an intermediate heat exchanger 9, an expansion valve 10, a main expansion valve 11 and an evaporator 12, wherein the compressor 2 is respectively connected with the top and the bottom of the oil separator 3 through pipelines, the oil separator 3 is connected with the air-cooled condenser 4 through a pipeline, the air-cooled condenser 4 is connected with a first passage of the water-cooled auxiliary condenser 5 through a pipeline, the first passage of the water-cooled auxiliary condenser 5 is connected with the drying filter 6 through a pipeline, a second passage of the water-cooled auxiliary condenser 5 is respectively connected with a cooling water outlet pipe and a cooling water inlet pipe, the drying filter 6 is connected with the first passage of the subcooler 7 through a pipeline with a liquid viewing mirror, the top of the gas-liquid separator 8 is connected with a first passage of the intermediate heat exchanger 9 through a pipeline, the bottom of the gas-liquid separator is connected with a second passage of the intermediate heat exchanger 9 through a pipeline with an expansion valve 10, the second passage of the intermediate heat exchanger 9 is connected with a second passage of the subcooler 7 through a pipeline, the second passage of the subcooler 7 is connected with the compressor 2 through a pipeline, the first passage of the intermediate heat exchanger 9 is connected with the evaporator 12 through a pipeline with a main expansion valve 11, the evaporator 12 is connected with a pipeline between the expansion valve 10 and the second passage of the intermediate heat exchanger 9 through a pipeline, and the bottom of the evaporator 12 is connected.
The gas-liquid separator 8, the intermediate heat exchanger 9 and the expansion valve 10 are all connected in series.
The ultra-low temperature freezer that runs under the high temperature environment yearly still include buffer tank 1, pipeline between drier-filter 6 and the subcooler 7 is connected through the pipeline of taking angle valve and unloading valve 101 to buffer tank 1 bottom, pipeline between subcooler 7 and the compressor 2 is still connected through the pipeline of taking angle valve and throttle capillary 102 to buffer tank 1 bottom.
An oil-filling high-pressure meter is arranged on a pipeline between the compressor 2 and the oil separator 3, an oil-filling low-pressure meter is arranged on a pipeline between the subcooler 7 and the compressor 2, and pipelines between the compressor 2 and the oil separator 3 and pipelines between the subcooler 7 and the compressor 2 are connected with a high-low pressure controller.
And an ambient temperature sensor is arranged on the air inlet side of the air-cooled condenser 4.
In the refrigeration mode, because a lower evaporation temperature is needed to be realized, the refrigeration system adopts a self-overlapping mode, two or more refrigerants with different boiling points are filled into the system, the compressor 2 operates to compress the gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant, the refrigerant carried in the refrigerant steam is separated out through the oil separator 3 and returns to the compressor 2 through the oil return pipe, then the refrigerant with high boiling point is condensed into a high-pressure liquid refrigerant after passing through the air-cooled condenser 4, the refrigerant with low boiling point still exists in a gaseous state, the environment temperature is detected through the environment temperature sensor, when the environment temperature is higher than a set value, the water-cooling auxiliary function is started, the refrigerant coming out of the air-cooled condenser 4 enters the water-cooling auxiliary condenser 5 to be continuously condensed, when the environment temperature is lower than the set value, the water-cooling auxiliary function is stopped, and the gas-liquid two-phase mixed refrigerant is, then the refrigerant enters a subcooler 7, the subcooler 7 is used for increasing the return air temperature and simultaneously ensuring that the high-boiling-point liquid refrigerant which is about to enter the intermediate heat exchanger has a certain subcooling degree so as to obtain a lower evaporation temperature, the subcooled mixed gas-liquid two-phase refrigerant is separated by a gas-liquid separator 8 on a refrigeration system, the gaseous refrigerant comes out from the upper part and enters an intermediate heat exchanger 9, the liquid refrigerant is separated from the bottom due to the action of gravity, is throttled by an expansion valve 10 and then enters the intermediate heat exchanger 8 to evaporate and absorb heat, the low-boiling-point gaseous low-temperature-level refrigerant is condensed into a liquid state, and the low-temperature liquid refrigerant is throttled and decompressed by a main expansion valve 11 and finally enters an.
Because the refrigerant pressure of the low-temperature stage is higher than that of the refrigerant, the buffer tank 1 and the unloading valve 101 are arranged in the refrigeration system, when the pressure exceeds the opening pressure of the unloading valve 101, the refrigeration system releases high-pressure gaseous low-temperature stage refrigeration into the buffer tank 1 from the front of the subcooler 7, the safety of the system is ensured, and high-pressure gas entering the buffer tank 1 is decompressed by the throttling capillary tube 102 and then is connected to a gas return pipe of the compressor 2, so that the suction amount of the compressor 2 is supplemented, and the refrigeration capacity of the equipment is improved.
All the above components are prior art, and those skilled in the art can use any model and existing design that can implement their corresponding functions.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and improvements can be made without departing from the inventive concept, and all of them belong to the protection scope of the present invention.
Claims (5)
1. An ultralow temperature freezer which runs all year round in a high-temperature environment is characterized by comprising a compressor (2), an oil separator (3), an air-cooled condenser (4), a water-cooled auxiliary condenser (5), a drying filter (6), a subcooler (7), a gas-liquid separator (8), an intermediate heat exchanger (9), an expansion valve (10), a main expansion valve (11) and an evaporator (12), wherein the compressor (2) is respectively connected with the top and the bottom of the oil separator (3) through pipelines, the oil separator (3) is connected with the air-cooled condenser (4) through a pipeline, the air-cooled condenser (4) is connected with a first passage of the water-cooled auxiliary condenser (5) through a pipeline, the first passage of the water-cooled auxiliary condenser (5) is connected with the drying filter (6) through a pipeline, a second passage of the water-cooled auxiliary condenser (5) is respectively connected with a cooling water outlet pipe and a cooling water inlet pipe, the drying filter (6) is connected with the, the first passage of the subcooler (7) is connected with the top of the gas-liquid separator (8), the top of the gas-liquid separator (8) is connected with the first passage of the intermediate heat exchanger (9) through a pipeline, the bottom of the gas-liquid separator is connected with the second passage of the intermediate heat exchanger (9) through a pipeline with an expansion valve (10), the second passage of the intermediate heat exchanger (9) is connected with the second passage of the subcooler (7) through a pipeline, the second passage of the subcooler (7) is connected with the compressor (2) through a pipeline, the first passage of the intermediate heat exchanger (9) is connected with the evaporator (12) through a pipeline with a main expansion valve (11), the evaporator (12) is connected with the pipeline between the expansion valve (10) and the second passage of the intermediate heat exchanger (9) through a pipeline, and the bottom of the evaporator.
2. The ultra-low temperature freezer operating year round in a high temperature environment as claimed in claim 1, wherein said gas-liquid separator (8), intermediate heat exchanger (9) and expansion valve (10) are connected in series.
3. The ultra-low temperature freezer running in high temperature environment all year round as claimed in claim 1, characterized by further comprising a buffer tank (1), wherein the bottom of the buffer tank (1) is connected with a pipeline between the drying filter (6) and the subcooler (7) through a pipeline with an angle valve and a load relief valve (101), and the bottom of the buffer tank (1) is also connected with a pipeline between the subcooler (7) and the compressor (2) through a pipeline with an angle valve and a throttling capillary tube (102).
4. The ultra-low temperature freezer running in high temperature environment all year round as claimed in claim 1, characterized in that the pipeline between the compressor (2) and the oil separator (3) is provided with an oil-filled high pressure gauge, the pipeline between the subcooler (7) and the compressor (2) is provided with an oil-filled low pressure gauge, and the pipeline between the compressor (2) and the oil separator (3) and the pipeline between the subcooler (7) and the compressor (2) are connected with a high-low pressure controller.
5. The ultra-low temperature freezer which operates year round in a high temperature environment as claimed in claim 1, characterized in that an ambient temperature sensor is provided on the air intake side of the air-cooled condenser (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020120090.9U CN211552166U (en) | 2020-01-19 | 2020-01-19 | Ultralow temperature refrigerator capable of operating all year round in high-temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020120090.9U CN211552166U (en) | 2020-01-19 | 2020-01-19 | Ultralow temperature refrigerator capable of operating all year round in high-temperature environment |
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| Publication Number | Publication Date |
|---|---|
| CN211552166U true CN211552166U (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020120090.9U Active CN211552166U (en) | 2020-01-19 | 2020-01-19 | Ultralow temperature refrigerator capable of operating all year round in high-temperature environment |
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|---|---|
| CN (1) | CN211552166U (en) |
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- 2020-01-19 CN CN202020120090.9U patent/CN211552166U/en active Active
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