CN206755641U - A kind of air-cooled single cooler group of technical cooling under pole low temperature environment - Google Patents
A kind of air-cooled single cooler group of technical cooling under pole low temperature environment Download PDFInfo
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- CN206755641U CN206755641U CN201720594277.0U CN201720594277U CN206755641U CN 206755641 U CN206755641 U CN 206755641U CN 201720594277 U CN201720594277 U CN 201720594277U CN 206755641 U CN206755641 U CN 206755641U
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- condenser
- reservoir
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- 238000001816 cooling Methods 0.000 title claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 239000003507 refrigerant Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 17
- OHMHBGPWCHTMQE-UHFFFAOYSA-N 2,2-dichloro-1,1,1-trifluoroethane Chemical group FC(F)(F)C(Cl)Cl OHMHBGPWCHTMQE-UHFFFAOYSA-N 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model discloses the technical cooling under a kind of pole low temperature environment air-cooled single cooler group, including compressor, wind side condenser, expansion valve, water side evaporator, reservoir, electric heater, pressure switch and pressure sensor.The volume of reservoir be more than wind side condenser coil pipe volume and in have liquid refrigerant；The exhaust side of compressor is sequentially connected the suction side of wind side condenser, reservoir, expansion valve, water side evaporator and compressor；Electric heater is arranged on the surface of reservoir；Pressure switch is connected electrically on electric heater and is connected with reservoir signal；A pipeline is connected between the exhaust side and reservoir of compressor, a check valve is installed on the pipeline；Pressure sensor is arranged between the exhaust side of compressor and the downstream of wind side condenser.The air-cooled single cooler group of technical cooling of the present utility model, normally can start and run in the environment of temperature as little as 30 DEG C.
Description
Technical Field
The utility model relates to an air-cooled single cooling unit is used in technology cooling under extremely low temperature environment.
Background
A conventional air-cooled single-cooling unit is a refrigeration circuit formed by a compressor 1, a wind-side condenser 2, an expansion valve 3, a water-side evaporator 4, and the compressor 1 (see fig. 1). High-temperature gas of a refrigerant discharged by the compressor 1 is condensed into liquid in the wind-side condenser 2, is throttled and depressurized by the throttling device, enters the water-side evaporator 3, absorbs heat, evaporates and returns to the compressor 1, and a refrigeration cycle is completed. The air cooling unit for cooling the process in the production and manufacturing process needs chilled water which enters at 12 ℃ and exits at 7 ℃ all the year round and is used for cooling the process. For areas with extremely low ambient temperatures, such as the northern areas of china, where the outdoor temperature is as low as about-30 ℃ in winter, or even lower, indoor production equipment often requires process cooling. In such an environment, normal operation of the conventional air-cooled single-cooling unit is impossible. When the conventional air-cooling single-cooling unit is applied to the environment, two problems can occur:
1. when the ambient temperature is extremely low (-30 ℃), the compressor starts to operate immediately after the unit is started, the low-pressure alarm of the unit appears very quickly, and if the unit is started repeatedly for many times, the motor of the compressor can be burnt. The reason is that the outdoor environment temperature is extremely low, the pressure in the condenser coil is very low, after the compressor is started, the high-temperature gaseous refrigerant discharged into the condenser coil is quickly condensed into liquid, and the condensing pressure cannot rise, so that the refrigerant cannot normally and continuously enter the evaporator through the expansion valve; however, the compressor still continuously sucks the refrigerant from the evaporator, so that the low-pressure side pressure of the water side evaporator is quickly reduced, the low-pressure alarm of the unit is caused, and the unit cannot be started normally.
2. After the unit is normally started, although the condensing temperature of the wind side is controlled by reducing the running number of fans on the wind side condenser or reducing the rotating speed of the fans, under the condition that the outdoor environment temperature is very low, even if all the fans are stopped, the required condensing pressure is still out of control, so that the low-pressure alarm of the unit is caused, and the unit cannot normally run.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide an air-cooled single cooling unit for process cooling in extremely low temperature environment, which can be normally started and operated in the environment with the temperature as low as-30 ℃.
The purpose of the utility model is realized like this: an air-cooled single-cooling unit for process cooling in an extremely low temperature environment comprises a compressor, an air side condenser, an expansion valve, a water side evaporator, a liquid storage device, an electric heater, a pressure switch and a pressure sensor; wherein,
the volume of the liquid accumulator is larger than that of a coil pipe of the wind side condenser, and liquid refrigerant is stored in the liquid accumulator;
the exhaust side of the compressor is connected with the upstream of a coil pipe of the air side condenser, the downstream of the coil pipe of the air side condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is connected with the inlet of the expansion valve, the outlet of the expansion valve is connected with the inlet of the water side evaporator, and the outlet of the water side evaporator is connected with the suction side of the compressor;
the electric heater is mounted on the surface of the liquid reservoir;
the pressure switch is electrically connected to the electric heater and is in signal connection with the liquid storage device;
a pipeline is connected between the exhaust side of the compressor and the liquid reservoir, and a one-way valve is installed on the pipeline;
the pressure sensor is disposed between a discharge side of the compressor and downstream of the wind-side condenser.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment comprises a coil pipe and a plurality of fans which are arranged beside the coil pipe and controlled by a variable frequency controller.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment is characterized in that a pressure gauge is further connected between the pressure switch and the liquid storage device.
The air-cooled single cooling unit for process cooling in the extremely low temperature environment is characterized in that the liquid refrigerant is hydrochlorofluorocarbon or hydrofluorocarbon.
The utility model discloses an air-cooled single cooling unit is used in technology cooling under extremely low temperature environment has following characteristics: a liquid storage device with the volume larger than that of a condenser coil of the wind side condenser is arranged between the downstream of the coil of the wind side condenser and an expansion valve, and an electric heater is arranged on the liquid storage device, so that the pressure in the liquid storage device is increased, the pressure is enough to push a refrigerant to rapidly pass through the expansion valve to enter a water side evaporator and a suction side of a compressor, the condensation pressure is kept not to be reduced, and the unit can be normally started and operated in an environment with the temperature as low as minus 30 ℃. In addition, a pipeline provided with a one-way valve is connected between the exhaust side of the compressor and the liquid storage device, if the unit is in operation and the pressure in the wind side condenser is still low, the one-way valve is opened to lead high-temperature and high-pressure airflow from the exhaust side of the compressor into the liquid storage device so as to maintain the pressure in the liquid storage device, and the inlet pressure of the expansion valve is greater than the outlet pressure to form a certain pressure difference, so that the unit can normally operate in an environment with the temperature as low as minus 30 ℃.
Drawings
FIG. 1 is a schematic structural diagram of a prior art air-cooled chiller unit;
fig. 2 is a schematic structural diagram of the air-cooled single cooling unit for process cooling in the extremely low temperature environment of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 2, the air-cooled single chiller unit for process cooling in extremely low temperature environment of the present invention includes a compressor 1, an air-side condenser 2, an expansion valve 3, a water-side evaporator 4, a liquid reservoir 5, an electric heater 6, a pressure switch 7, a check valve 8 and a pressure sensor 10; wherein:
the wind side condenser 2 comprises a coil 21 and a plurality of fans 22 which are arranged beside the coil 21 and controlled by a variable frequency controller;
the accumulator 5 has a volume greater than the volume of the condenser coil 21 of the wind side condenser 2 and contains liquid refrigerant; the liquid refrigerant is hydrochlorofluorocarbon or hydrofluorocarbon, specifically including R134a, R22, R407C, R410A, R32;
the exhaust side of the compressor 1 is connected with the upstream of a condenser coil 21 of the wind-side condenser 2, the downstream of the condenser coil 21 is connected with the inlet of an accumulator 5, the outlet of the accumulator 5 is connected with the inlet of an expansion valve 3, the outlet of the expansion valve 3 is connected with the inlet of a water-side evaporator 4, and the outlet of the water-side evaporator 4 is connected with the suction side of the compressor 1;
the electric heater 6 is arranged on the surface of the liquid reservoir 6;
the pressure switch 7 is electrically connected on the electric heater 6 and is in signal connection with the liquid storage device 5; a pressure gauge 9 is also connected between the pressure switch 7 and the liquid reservoir 5;
a pipeline is connected between the exhaust side of the compressor 1 and the liquid accumulator 5, and the one-way valve 8 is installed on the pipeline;
the pressure sensor 10 is disposed between the discharge side of the compressor 1 and the downstream of the wind-side condenser 2.
The operation method of the air-cooled single cooling unit for process cooling in the extremely low temperature environment comprises the unit starting step and the unit operation step;
when the unit starting step is carried out, the electric heater 6 is started through the pressure switch 7, so that the pressure in the liquid storage device 5 is increased, and when the pressure in the liquid storage device 5 is increased to a set value, the electric heater 6 is closed through the pressure switch 7; the pressure in the accumulator 5 raises the condensation pressure, which is sufficient to circulate the refrigerant in the refrigeration circuit of the unit and to pass rapidly through the expansion valve 3 into the water-side evaporator 4, causing the compressor to start normally;
when the unit operation step is carried out, the condensing pressure is measured through the pressure sensor 10, when the ambient temperature is reduced to minus 30 ℃, the condensing pressure is smaller than a set value, the condensing pressure is increased by reducing the number of the fans 22 for starting the wind side condenser 2 or reducing the rotating speed of the fans 22 until all the fans 22 are stopped; if the condensing pressure is still less than the set value, the one-way valve 8 is opened, that is, the wind-side condenser 2 is stopped, the high-temperature and high-pressure air flow at the exhaust side of the compressor 1 is introduced into the liquid storage device 5, the pressure in the liquid storage device 5 is maintained at the set value, further, the inlet pressure of the expansion valve 3 is greater than the outlet pressure and forms a certain pressure difference, the refrigerant in the refrigeration loop of the unit circularly flows and enters the water-side evaporator 4 through the expansion valve 3, and the unit can normally operate.
The utility model discloses an air-cooled single cooling unit is used in technology cooling under extremely low temperature environment has following characteristics: by connecting a liquid storage device between the downstream of the coil of the wind side condenser and the expansion valve, in order to ensure that liquid refrigerant still exists in the liquid storage device under the condition of extremely low ambient temperature (-30 ℃), the volume of the liquid storage device is larger than that of the coil of the condenser, and an electric heater is arranged on the liquid storage device, so that the pressure in the liquid storage device is increased, the pressure is enough to push the refrigerant to rapidly pass through the expansion valve to enter the suction side of the water side evaporator and the compressor, thereby keeping the condensation pressure not to be reduced, and ensuring that the unit can be normally started and operated under the environment with the temperature as low as-30 ℃. In addition, a pipeline provided with a one-way valve is connected between the exhaust side of the compressor and the liquid storage device, if the unit is in operation and the pressure in the wind side condenser is still low, the one-way valve is opened, high-temperature and high-pressure airflow at the exhaust side of the compressor is led into the liquid storage device to maintain the pressure in the liquid storage device, and the inlet pressure of the expansion valve is greater than the outlet pressure to form a certain pressure difference, so that the unit can normally operate in an environment with the temperature as low as minus 30 ℃.
The above embodiments are provided only for the purpose of illustration, not for the limitation of the present invention, and those skilled in the relevant art can make various changes or modifications without departing from the spirit and scope of the present invention, therefore, all equivalent technical solutions should also belong to the scope of the present invention, and should be defined by the claims.
Claims (4)
1. An air-cooled single-cooling unit for process cooling in an extremely low temperature environment comprises a compressor, an air-side condenser, an expansion valve, a water-side evaporator, a liquid storage device, an electric heater, a pressure switch and a pressure sensor, wherein the air-cooled single-cooling unit comprises a compressor, an air-side condenser, an expansion valve and a water-side evaporator;
the volume of the liquid accumulator is larger than that of a coil pipe of the wind side condenser, and liquid refrigerant is stored in the liquid accumulator;
the exhaust side of the compressor is connected with the upstream of a coil pipe of the air side condenser, the downstream of the coil pipe of the air side condenser is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is connected with the inlet of the expansion valve, the outlet of the expansion valve is connected with the inlet of the water side evaporator, and the outlet of the water side evaporator is connected with the suction side of the compressor;
the electric heater is mounted on the surface of the liquid reservoir;
the pressure switch is electrically connected to the electric heater and is in signal connection with the liquid storage device;
a pipeline is connected between the exhaust side of the compressor and the liquid reservoir, and a one-way valve is installed on the pipeline;
the pressure sensor is disposed between a discharge side of the compressor and downstream of the wind-side condenser.
2. An air-cooled chiller unit for process cooling in very low temperature environments according to claim 1 wherein the air side condenser comprises a coil and a plurality of fans mounted beside the coil and controlled by a variable frequency controller.
3. An air-cooled chiller unit for process cooling in very low temperature environments according to claim 1, wherein a pressure gauge is further connected between the pressure switch and the reservoir.
4. The air-cooled chiller unit for cooling a process in a very low temperature environment according to claim 1, wherein the liquid refrigerant is a hydrochlorofluorocarbon or a hydrofluorocarbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720594277.0U CN206755641U (en) | 2017-05-25 | 2017-05-25 | A kind of air-cooled single cooler group of technical cooling under pole low temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720594277.0U CN206755641U (en) | 2017-05-25 | 2017-05-25 | A kind of air-cooled single cooler group of technical cooling under pole low temperature environment |
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| Publication Number | Publication Date |
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| CN206755641U true CN206755641U (en) | 2017-12-15 |
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| CN201720594277.0U Active CN206755641U (en) | 2017-05-25 | 2017-05-25 | A kind of air-cooled single cooler group of technical cooling under pole low temperature environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014096A (en) * | 2017-05-25 | 2017-08-04 | 克莱门特捷联制冷设备(上海)有限公司 | A kind of technical cooling under pole low temperature environment is with air-cooled single cooler group |
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2017
- 2017-05-25 CN CN201720594277.0U patent/CN206755641U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014096A (en) * | 2017-05-25 | 2017-08-04 | 克莱门特捷联制冷设备(上海)有限公司 | A kind of technical cooling under pole low temperature environment is with air-cooled single cooler group |
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