CN212274310U - Two-stage falling film screw type cold water/heat pump unit - Google Patents

Two-stage falling film screw type cold water/heat pump unit Download PDF

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Publication number
CN212274310U
CN212274310U CN202020878155.6U CN202020878155U CN212274310U CN 212274310 U CN212274310 U CN 212274310U CN 202020878155 U CN202020878155 U CN 202020878155U CN 212274310 U CN212274310 U CN 212274310U
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oil
fluorine
inlet
evaporator
economizer
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刘元后
王雪峰
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Shandong Bofeiming Technology Co ltd
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Shandong Bofeiming Technology Co ltd
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Abstract

The utility model relates to a doublestage falling liquid film screw formula cold water heat pump set, including screw compressor, the oil separator, the condenser, the oil cooler, doublestage falling liquid film evaporator and economizer, screw compressor's gas vent passes through exhaust pipe and is connected with the fluorine mouth that advances of oil separator, screw compressor's economizer interface passes through the return air pipeline and is connected with the return air mouth of economizer, screw compressor's fuel feeding mouth is connected with the oil-out of oil cooler through supplying oil pipeline, the oil-out of oil separator passes through out oil pipeline and is connected with the oil inlet of oil cooler, the fluorine mouth that goes out of condenser passes through economizer liquid supply pipeline and is connected with the inlet of economizer, the liquid outlet of economizer passes through the evaporimeter liquid supply pipeline and is connected with the fluorine mouth that advances of evaporimeter, the evaporimeter oil return mouth is connected with the fluorine mouth of oil separator through returning oil pipeline. The utility model discloses heat exchange efficiency is high, and the refrigerating output increases, and is energy-efficient, return oil safe and reliable, and unit operation safety and stability has extensive popularization and application and worth.

Description

Two-stage falling film screw type cold water/heat pump unit
Technical Field
The utility model relates to a refrigeration plant technical field, especially a doublestage falling liquid film screw formula cold water heat pump set.
Background
At present, in the field of refrigeration and air conditioning, a refrigeration host used in a large-scale central air conditioning occasion generally adopts a dry-type or flooded screw cold water/heat pump unit, a water chilling unit adopting a dry-type shell-and-tube evaporator and a screw compressor is called a dry screw cold water unit, and if the refrigeration host is used in a heating occasion such as a water/ground source heat pump, the refrigeration host is called a dry screw heat pump unit; if the unit adopts a flooded evaporator, the unit is called a flooded screw cold water/heat pump unit. The dry evaporator has lower cost compared with a flooded evaporator, and the refrigerating unit adopting the dry evaporator has simple structure and simple control, so the dry evaporator is widely used. However, with the increasing social requirements for energy conservation and environmental protection, how to improve the energy efficiency ratio of the refrigeration host becomes more important, how to directly determine the energy efficiency ratio of the refrigeration host by the heat exchange efficiency of the evaporator, but the improvement of the heat transfer efficiency of the dry evaporator is limited due to some characteristics of the dry evaporator, so that dry screw cold water/heat pump units cannot be adopted in many occasions with higher requirements for the energy efficiency ratio, and instead, flooded screw cold water/heat pump units are adopted. However, the oil return system of the flooded unit is complex to control, and the refrigerant charging amount of the flooded unit is greatly increased compared with that of a dry unit. Although the operation efficiency of a flooded unit is higher than that of a traditional dry unit, the flooded unit has the problems of high failure rate, high cost, large refrigerant charge amount and the like. A falling film screw cold water/heat pump unit is adopted, and is different from a flooded lower liquid supply mode, a falling film evaporator generally adopts a built-in liquid separator to drip refrigerant liquid from the upper portion in an evaporator shell to a heat exchange tube, the refrigerant liquid continuously exchanges heat with secondary refrigerant in the tube, liquid refrigerant outside the tube is continuously evaporated into gaseous refrigerant, and the liquid separator continuously supplies the liquid refrigerant to the heat exchange tube, so that a film layer is always arranged on the surface of the heat exchange tube. The bottom of the falling film evaporator is still provided with a part of mixture of liquid refrigerant and lubricating oil which are not evaporated, and the part of liquid refrigerant is also provided with a part of heat exchange tubes to ensure that the liquid refrigerant is continuously evaporated, so that the lower part of the existing falling film evaporator still has a part of flooded heat exchange area, and the whole evaporator is not in a full falling film evaporation state. And for the unit that the heat transfer volume is bigger, the falling film evaporator tube bank number is more, the refrigerant on the outside of the heat exchange tube on upper portion does not evaporate, new liquid refrigerant supplements again, can have liquid refrigerant and can not the lubricating oil that the evaporator fell to drip on the heat exchange tube of lower part constantly, if the tube bank number is more, the liquid film and the oil film on the heat exchange tube of lower part can be thicker, thus influence the heat exchange efficiency of heat exchange tube of lower part, so the operating efficiency of the existing falling film screw rod cold water/heat pump unit is equivalent to the flooded unit, efficiency is not obviously promoted, even not as flooded unit, so its advantage lies in that the refrigerant charge volume is less than flooded unit. How to improve the efficiency of the falling film screw cold water/heat pump unit is a technical problem which is currently put in the front of technicians.
SUMMERY OF THE UTILITY MODEL
The main purpose of the utility model is to overcome the shortcomings of the prior art and provide a two-stage falling film screw type cold water/heat pump unit with high heat exchange efficiency, energy saving, high efficiency, safety, reliability and stable operation.
The utility model adopts the following technical scheme:
a two-stage falling film screw type cold water/heat pump unit comprises a screw compressor, an oil separator, a condenser, an oil cooler, a two-stage falling film evaporator and an economizer, wherein the screw compressor is provided with an economizer interface, the two-stage falling film evaporator comprises an evaporator shell, a first liquid inlet, a second liquid inlet, a first distributor, a second distributor, an evaporator heat exchange tube, a fluorine inlet, a fluorine outlet, an exhaust port and an oil return port, the first distributor is communicated with the first liquid inlet, and the second distributor is communicated with the second liquid inlet; an exhaust port of the screw compressor is connected with a fluorine inlet of the oil separator through an exhaust pipeline, an economizer interface of the screw compressor is connected with a return air port of the economizer through an air return pipeline, an oil supply port of the screw compressor is connected with an oil outlet of the oil cooler through an oil supply pipeline, an air suction port of the screw compressor is connected with a fluorine outlet of the evaporator through an air suction pipeline, the fluorine outlet of the oil separator is connected with a fluorine inlet of the condenser through an exhaust pipeline, an oil return port of the oil separator is connected with an oil inlet of the oil cooler through an oil return pipeline, the fluorine outlet of the condenser is connected with a liquid inlet of the economizer through an economizer liquid supply pipeline, a liquid outlet of the economizer is connected with the fluorine inlet of the evaporator through an evaporator liquid supply pipeline, an evaporator oil return port is connected with the fluorine inlet of the oil separator through the air return pipeline, and expansion valves are arranged on a liquid supply pipeline between the fluorine outlet of the condenser and an economizer liquid inlet and a liquid supply pipeline between the liquid outlet of.
Furthermore, the oil separator is arranged outside the condenser and comprises a fluorine inlet and two fluorine outlets, the fluorine inlet is arranged in the middle of the oil separator, the two fluorine outlets are respectively arranged at two sides of the oil separator, and a separating screen is arranged in a passage between the fluorine inlet and the two fluorine outlets.
Furthermore, still be provided with the solenoid valve on the liquid supply pipeline between economizer liquid outlet and the evaporimeter fluorine inlet, be provided with the stop valve on the gas return pipeline between helical-lobe compressor's economizer interface and the economizer return-air port, still be provided with solenoid valve and hand valve on the liquid supply pipeline between condenser fluorine outlet and the economizer inlet.
Furthermore, a drying filter is arranged on a liquid supply pipeline between the fluorine outlet of the condenser and the liquid inlet of the economizer, and oil filters are arranged on an oil return pipeline between the oil return port of the evaporator and the fluorine inlet of the oil separator and an oil return pipeline between the oil return port of the oil separator and the oil inlet of the oil cooler.
Furthermore, temperature sensors, pressure sensors, safety valves and maintenance valves are arranged on the exhaust pipeline, the gas return pipeline and the gas suction pipeline.
Further, the evaporator is also provided with a liquid level meter and a liquid sight glass.
Further, the condenser comprises a condenser shell, a fluorine inlet, a fluorine outlet, a liquid inlet, a liquid outlet, an exhaust port and a condenser heat exchange tube.
Furthermore, the evaporator is arranged above the condenser, the oil separators are connected with the condenser and arranged side by side, and the screw compressor is arranged above the oil separators.
Further, the evaporator adopts a six-flow evaporator.
Further, the condenser adopts a four-process condenser.
From the above description of the present invention, compared with the prior art, the present invention has the following advantages:
firstly, a two-stage falling film evaporator is adopted to provide two paths of liquid supply, so that the technical problem of poor heat exchange efficiency of the lower part of the traditional one-stage falling film evaporator is solved, and the heat exchange efficiency of the evaporator is greatly improved;
secondly, the oil temperature can be controlled by arranging the oil cooler so that the lubricating oil achieves the optimal lubricating effect, and the refrigerating capacity of the screw compressor can be increased by about 10% by arranging the economizer so as to achieve the effect of high efficiency and energy conservation;
thirdly, the oil separator is externally arranged, and is provided with a fluorine inlet and two fluorine outlets, the fluorine inlet is arranged in the middle of the oil separator, the two fluorine outlets are respectively arranged at two sides of the oil separator, and the two sides are respectively provided with a separating screen, so that the oil separating effect is better, the refrigerating capacity reduction caused by the lubricating oil entering the system is reduced, meanwhile, the external arrangement of the oil separator is beneficial to increasing the heat exchange area, the temperature difference is large, the cold accumulation is large, and the heat dissipation is good;
fourthly, a safer two-way oil return system is adopted, one way is an oil separator oil return system, and the other way is an evaporator oil return system, so that the oil return of the screw compressor is safer and more reliable;
fifthly, the liquid supply amount to the evaporator is controlled by adjusting the opening degree of the expansion valve, and the opening degree of the electronic expansion valve is controlled by a control signal of the opening degree of the expansion valve, which is derived from a signal of a liquid level meter of the evaporator and a superheat degree signal obtained by calculating data collected by a temperature sensor and a pressure sensor on an air suction pipeline and an air exhaust pipeline; adjustable electromagnetic valves or stop valves are arranged at two ends of the expansion valve, so that false operation caused by misjudgment of expansion valve control signals under unstable working conditions such as unit starting can be prevented, the fault probability is reduced, and the safety and the stability of unit operation are improved;
in a word, the utility model discloses can be used to occasions such as central air conditioning refrigeration, water source heat pump heating and industrial cooling, heat exchange efficiency is high, and energy-conserving high efficiency, safe and reliable can replace traditional dry-type, flooded and ordinary falling liquid film formula screw rod cold water heat pump set, have extensive popularization and application and worth.
Drawings
FIG. 1 is an elevational view of the overall construction of an embodiment of the present invention;
FIG. 2 is a side view of the overall structure of an embodiment of the present invention;
FIG. 3 is a partial front view of an embodiment of the present invention showing the connection of an oil separator to a screw compressor;
FIG. 4 is a front view of a screw compressor according to an embodiment of the present invention;
FIG. 5 is a side cross-sectional view of an evaporator according to an embodiment of the present invention showing the distribution of heat exchange tubes of the evaporator;
FIG. 6 is a side cross-sectional view of a condenser according to an embodiment of the present invention, showing the distribution of the heat exchange tubes of the condenser;
fig. 7 is a schematic diagram of a system connection structure according to an embodiment of the present invention.
In the figure: 1. the system comprises a screw compressor, 2, an oil separator, 3, a condenser, 4, an oil cooler, 5, a two-stage falling-film evaporator, 6, an evaporator shell, 7, an evaporator liquid inlet, 8, an evaporator liquid outlet, 9, a first distributor, 10, a second distributor, 11, an evaporator heat exchange pipe, 12, an evaporator fluorine inlet, 13, an evaporator fluorine outlet, 14, an evaporator safety valve seat, 15, an evaporator pressure measuring port, 16, an evaporator exhaust port, 17, an evaporator sewage outlet, 18, an evaporator oil return port, 19, a first liquid sight glass, 20, an evaporator flow meter seat, 21, an evaporator temperature sensing seat, 22, a condenser shell, 23, a condenser fluorine inlet, 24, a condenser fluorine outlet, 25, a condenser liquid inlet, 26, a condenser liquid outlet, 27, a condenser safety valve seat, 28, a condenser pressure measuring port, 29, a condenser exhaust port, 30, a condenser sewage outlet, 31. a condenser flow meter seat, 32, a condenser temperature sensing seat, 33, a condenser heat exchange tube, 34, an oil separator fluorine inlet, 35, an oil separator first fluorine outlet, 36, an oil separator second fluorine outlet, 37, a first separating screen, 38, a second separating screen, 39, a third separating screen, 40, a fourth separating screen, 41, an oil separator safety valve seat, 42, an oil separator maintenance valve seat, 43, an oil separator oil injection valve interface, 44, an oil separator liquid viewing lens seat, 45, an oil separator oil return port, 46, an oil separator oil discharge port, 47, an oil level switch interface, 48, an oil supply port, 49, an air suction port, 50, an air discharge port, 51, an economizer interface, 52, an oil path window, 53, an exhaust temperature sensor, 54, an economizer air return port, 55, an economizer liquid inlet, 56, an economizer liquid outlet, 57, an oil cooler oil inlet, 58, an oil cooler oil outlet, 59. the system comprises a first exhaust pipeline, a second exhaust pipeline, a first return pipeline, a 65 economizer liquid supply pipeline, a 66 evaporator liquid supply pipeline, a 67 second return pipeline, a 68 first hand valve, a 69 drying filter, a 70 second hand valve, a 71 second liquid observation mirror, a 72 first electromagnetic valve, a 73 first expansion valve, a 74 second expansion valve, a 75 second electromagnetic valve, a 76 stop valve, a 77 check valve, a 78 first oil filter, a 79 first ejector, an 80 second oil filter, a 81 second ejector, a 82 first mounting support, a 83 second mounting support, a 84 mounting foot, an 85 economizer and an 86 electronic control cabinet.
Detailed Description
The present invention will be further described with reference to the following detailed description.
Referring to fig. 1 to 7, the two-stage falling film screw type cold water/heat pump unit of the present invention includes a screw compressor 1, an oil separator 2, a condenser 3, an oil cooler 4, a two-stage falling film evaporator 5, an economizer 85 and an electric control cabinet 86.
The two-stage falling film evaporator 5 comprises an evaporator shell 6, an evaporator liquid inlet 7, an evaporator liquid outlet 8, a first distributor 9, a second distributor 10, an evaporator heat exchange tube 11, an evaporator fluorine inlet 12, an evaporator fluorine outlet 13, an evaporator safety valve seat 14, an evaporator pressure measuring port 15, an evaporator exhaust port 16, an evaporator drain 17, an evaporator oil return port 18, a first liquid sight glass 19, an evaporator flow meter seat 20 and an evaporator temperature sensing seat 21, wherein the evaporator liquid inlet 7 comprises a first liquid inlet and a second liquid inlet, the first distributor 10 is communicated with the first liquid inlet, the second distributor 10 is communicated with the second liquid inlet, and the evaporator pressure measuring port 15 is used for connecting a pressure gauge to monitor the pressure drop of each component during maintenance and overhaul of a unit and can also be used for filling and releasing refrigerant. The two-stage falling-film evaporator 5 adopts a six-flow evaporator. A liquid level meter assembly for monitoring the liquid level height in the two-stage falling film evaporator 5 is also arranged on the evaporator shell 6 and comprises a liquid level meter, a liquid level meter sleeve, an upper shutoff valve, a lower shutoff valve, an upper connecting pipe and a lower connecting pipe; the liquid level meter is arranged in the liquid level meter sleeve, one end of an upper connecting pipe is connected to the evaporator shell 6 and communicated with the inside of the evaporator shell 6, the other end of the upper connecting pipe is communicated with one end of an upper shutoff valve, and the other end of the upper shutoff valve is connected to the upper end of the liquid level meter sleeve and communicated with the inside of the liquid level meter sleeve; one end of the lower connecting pipe is connected to the evaporator shell 6 and communicated with the inside of the evaporator shell 6, the other end of the lower connecting pipe is communicated with one end of the lower shutoff valve, and the other end of the lower shutoff valve is connected to the lower end of the liquid level meter sleeve and communicated with the inside of the liquid level meter sleeve. The gauge sleeve is fixed to the evaporator housing 6 by a gauge support plate. The gauge assembly structure is prior art and is not shown in the drawings.
The condenser 3 comprises a condenser shell 22, a condenser fluorine inlet 23, a condenser fluorine outlet 24, a condenser liquid inlet 25, a condenser liquid outlet 26, a condenser safety valve seat 27, a condenser pressure measuring port 28, a condenser exhaust port 29, a condenser drain outlet 30, a condenser flow meter seat 31, a condenser temperature sensing seat 32 and a condenser heat exchange tube 33, wherein the condenser pressure measuring port 28 is used for connecting a pressure meter to monitor the pressure drop of each component in the front and back process during maintenance and overhaul of the unit. The condenser 3 adopts a four-process condenser.
The oil separator 2 is arranged outside the condenser 3 and comprises an oil separator fluorine inlet 34, an oil separator first fluorine outlet 35 and an oil separator second fluorine outlet 36, the oil separator fluorine inlet 34 is arranged in the middle of the oil separator 2, the oil separator first fluorine outlet 35 and the oil separator second fluorine outlet 36 are respectively arranged on two sides of the oil separator 2, a first separating sieve 37 and a second separating sieve 38 are arranged in a passage between the oil separator fluorine inlet 34 and the oil separator first fluorine outlet 35, and a third separating sieve 39 and a fourth separating sieve 40 are arranged in a passage between the oil separator fluorine inlet 34 and the oil separator second fluorine outlet 36. The oil separator 2 is also provided with an oil separator safety valve seat 41, an oil separator overhaul valve seat 42, an oil separator oil filling valve interface 43, an oil separator liquid observation mirror seat 44 for mounting a liquid observation mirror, an oil separator oil return port 45, an oil separator oil discharge port 46 and an oil level switch interface 47.
The screw compressor 1 is provided with an oil supply port 48, an intake port 49, an exhaust port 50, an economizer port 51, an oil passage window 52, and an exhaust temperature sensor 53. The economizer 85 is provided with an economizer return gas port 54, an economizer inlet 55, and an economizer outlet 56. The oil cooler 4 is provided with an oil cooler oil inlet 57 and an oil cooler oil outlet 58.
The exhaust port 50 of the screw compressor 1 is connected to the oil separator fluorine inlet 34 via a first exhaust line 59, the economizer port 51 of the screw compressor 1 is connected to the return port 54 of the economizer 85 via a return line 60, the oil supply port 48 of the screw compressor 1 is connected to the oil cooler oil outlet 58 via an oil supply line 61, the suction port 49 of the screw compressor 1 is connected to the evaporator fluorine outlet 13 via a suction line 62, the oil separator first fluorine outlet 35, the oil separator second fluorine outlet 36 is connected with the condenser fluorine inlet 23 through a second exhaust pipeline 63, the oil separator oil return port 45 is connected with the oil cooler oil inlet 57 through a first oil return pipeline 64, the condenser fluorine outlet 24 is connected with the economizer liquid inlet 55 through an economizer liquid supply pipeline 65, the economizer liquid outlet 56 is connected with the evaporator fluorine inlet 12 through an evaporator liquid supply pipeline 66, and the evaporator oil return port 18 is connected with the oil separator fluorine inlet 34 through a second oil return pipeline 67.
A first hand valve 68, a dry filter 69, a second hand valve 70, a second liquid sight glass 71, a first electromagnetic valve 72 and a first expansion valve 73 are sequentially arranged on an economizer liquid supply pipeline 65 between the condenser fluorine outlet 24 and the economizer liquid inlet 55; a second expansion valve 74 and a second electromagnetic valve 75 are arranged on the evaporator liquid supply pipeline 66 between the economizer liquid outlet 56 and the evaporator fluorine inlet 12; a stop valve 76 and a check valve 77 are arranged on the return air pipeline 60 between the economizer interface 51 and the economizer return air port 54 of the screw compressor 1; a first oil filter 78 and a first ejector 79 are arranged on a second oil return pipeline 67 between the oil return port 18 of the evaporator and the fluorine inlet 34 of the oil separator, and a second oil filter 80 and a second ejector 81 are arranged on a first oil return pipeline 64 between the oil return port 45 of the oil separator and the oil inlet 57 of the oil cooler; the first exhaust pipeline 59, the second exhaust pipeline 63, the air return pipeline 60 and the air suction pipeline 62 are all provided with a temperature sensor, a pressure sensor, a safety valve and a maintenance valve. The two-stage falling film evaporator 5 is arranged above the condenser 3, the oil separator 2 is connected with the condenser 3 and arranged side by side, the screw compressor 1 is arranged above the oil separator 2 through the first mounting support 82, and the electric control cabinet 86 is fixed above the oil separator 2 through the second mounting support 83. The unit is provided with a plurality of mounting feet 84 for fixing the unit itself. The first ejector 79, the second ejector 81 and other components not described in detail are all of the prior art structure, and are not described in detail herein.
Referring to fig. 1 to 7, when the two-stage falling film screw type cold water/heat pump unit of the present invention operates, the high pressure and high temperature gas refrigerant compressed by the screw compressor 1 is discharged into the oil separator 2 through the first exhaust pipe 59, most of the refrigerant oil is separated through the oil separator 2, the gas refrigerant containing a small amount of refrigerant oil enters the condenser 3 and exchanges heat with the cooling medium flowing through the heat exchange tube 33 of the condenser, the gas refrigerant releases heat and is condensed into liquid refrigerant, the liquid refrigerant flows out from the liquid outlet 26 of the condenser, is filtered by the drying filter 69 and reaches the inlet of the first expansion valve 73 through the economizer liquid supply pipe 65, the refrigerant which is mainly liquid and has a small amount of gas and is changed into low pressure state through the throttling and pressure reduction action of the first expansion valve 73 and enters the economizer 85, the small amount of gas refrigerant flows out from the economizer return port 54 and enters the screw compressor 1 through the return pipe 60, the liquid refrigerant enters the two-stage falling-film evaporator 5 through the evaporator liquid supply pipeline 66 and the second expansion valve 74, the liquid refrigerant is dripped onto the evaporator heat exchange tube 11 under the uniform distribution of the first distributor 9 and the second distributor 10 and exchanges heat with the cold carrying medium flowing through the evaporator heat exchange tube 11, the liquid refrigerant absorbs heat and evaporates into gaseous refrigerant, the gaseous refrigerant flows out from the evaporator fluorine outlet 13 and returns to the screw compressor 1 through the air suction pipeline 62, thereby completing the whole refrigeration cycle, and the refrigerating capacity of the screw compressor 1 can be increased by about 10% by arranging the economizer 85. The second expansion valve 74 controls the liquid supply amount to the two-stage falling film evaporator 5 by adjusting the opening degree, the control signal of the opening degree of the second expansion valve 74 is derived from the signal of the evaporator liquid level meter, or the opening degree of the second expansion valve 74 can be controlled by the superheat degree signal obtained by the calculation of the data collected by the temperature sensor and the pressure sensor on the suction pipeline and the exhaust pipeline, namely, the opening degree of the second expansion valve 74 is indirectly controlled by the suction superheat degree or the exhaust superheat degree.
The utility model discloses a doublestage falling liquid film screw formula cold water heat pump set has two way oil return systems, is the evaporimeter oil return system all the way, is the oil separator oil return system all the way. Evaporator oil return system: the first ejector 79 ejects the mixture of the liquid refrigerant and the oil in the low-pressure state in the two-stage falling-film evaporator 5 into the oil separator 2 through the second oil return pipeline 67 by using the high-pressure gas in the oil separator 2, then the mixture is separated by the oil separator 2, the separated oil is cooled by the oil cooler 4 and returns to the screw compressor 1, and the separated refrigerant enters the condenser 3. Because the two-stage falling film evaporator 5 adopts two-stage distribution, the liquid film on the heat exchange tube 11 of the evaporator is thin, thereby greatly improving the heat exchange efficiency, the liquid storage surface in the two-stage falling film evaporator 5 is lower, the liquid storage amount of the refrigerant is less, and the oil concentration is higher, so that the oil return is safer and more reliable than that of a flooded evaporator, the heat exchange area of the heat exchange tube 11 of the evaporator is fully exerted, and the screw compressor 1 is safer to operate. Oil separator oil return system: when the oil pressure in the screw compressor 1 is low, the oil level switch is touched to act, the oil return electromagnetic valve is controlled to be opened, and at the moment, the oil in the oil separator 2 is conveyed to the oil cooler 4 through the first oil return pipeline 64 under the action of high-low pressure difference through the second ejector 81, is cooled by the oil cooler 4 and then returns to the screw compressor 1 through the oil supply port 48.
The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, and the present invention is to be used for insubstantial modification of the present invention, which all infringes the protection scope of the present invention.

Claims (10)

1. The utility model provides a doublestage falling film screw formula cold water heat pump set which characterized in that: the double-stage falling film evaporator comprises an evaporator shell, a first liquid inlet, a second liquid inlet, a first distributor, a second distributor, an evaporator heat exchange tube, a fluorine inlet, a fluorine outlet, an exhaust port and an oil return port, wherein the first distributor is communicated with the first liquid inlet, and the second distributor is communicated with the second liquid inlet; an exhaust port of the screw compressor is connected with a fluorine inlet of the oil separator through an exhaust pipeline, an economizer interface of the screw compressor is connected with a return air port of the economizer through an air return pipeline, an oil supply port of the screw compressor is connected with an oil outlet of the oil cooler through an oil supply pipeline, an air suction port of the screw compressor is connected with a fluorine outlet of the evaporator through an air suction pipeline, the fluorine outlet of the oil separator is connected with a fluorine inlet of the condenser through an exhaust pipeline, an oil return port of the oil separator is connected with an oil inlet of the oil cooler through an oil return pipeline, the fluorine outlet of the condenser is connected with a liquid inlet of the economizer through an economizer liquid supply pipeline, a liquid outlet of the economizer is connected with the fluorine inlet of the evaporator through an evaporator liquid supply pipeline, an evaporator oil return port is connected with the fluorine inlet of the oil separator through the air return pipeline, and expansion valves are arranged on a liquid supply pipeline between the fluorine outlet of the condenser and an economizer liquid inlet and a liquid supply pipeline between the liquid outlet of.
2. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: the oil separator is arranged outside the condenser and comprises a fluorine inlet and two fluorine outlets, the fluorine inlet is arranged in the middle of the oil separator, the two fluorine outlets are respectively arranged at two sides of the oil separator, and a separating screen is arranged in a passage between the fluorine inlet and the two fluorine outlets.
3. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: still be provided with the solenoid valve on the liquid supply pipeline between economizer liquid outlet and the evaporimeter fluorine inlet, be provided with the stop valve on the gas return pipeline between helical-lobe compressor's economizer interface and the economizer return-air inlet, still be provided with solenoid valve and hand valve on the liquid supply pipeline between condenser fluorine outlet and the economizer inlet.
4. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: and a drying filter is arranged on a liquid supply pipeline between the fluorine outlet of the condenser and the liquid inlet of the economizer, and oil filters are arranged on an oil return pipeline between the oil return port of the evaporator and the fluorine inlet of the oil separator and an oil return pipeline between the oil return port of the oil separator and the oil inlet of the oil cooler.
5. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: and the exhaust pipeline, the gas return pipeline and the gas suction pipeline are all provided with a temperature sensor, a pressure sensor, a safety valve and an overhaul valve.
6. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: the evaporator is also provided with a liquid level meter and a liquid sight glass.
7. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: the condenser comprises a condenser shell, a fluorine inlet, a fluorine outlet, a liquid inlet, a liquid outlet, an exhaust port and a condenser heat exchange tube.
8. The two-stage falling-film screw type cold water/heat pump unit according to any one of claims 1 to 7, wherein: the evaporator is arranged above the condenser, the oil separators are connected with the condenser and arranged side by side, and the screw compressor is arranged above the oil separators.
9. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: the evaporator adopts a six-flow evaporator.
10. The two-stage falling film screw type cold water/heat pump unit of claim 1, wherein: the condenser adopts a four-process condenser.
CN202020878155.6U 2020-05-22 2020-05-22 Two-stage falling film screw type cold water/heat pump unit Active CN212274310U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020878155.6U CN212274310U (en) 2020-05-22 2020-05-22 Two-stage falling film screw type cold water/heat pump unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020878155.6U CN212274310U (en) 2020-05-22 2020-05-22 Two-stage falling film screw type cold water/heat pump unit

Publications (1)

Publication Number Publication Date
CN212274310U true CN212274310U (en) 2021-01-01

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Application Number Title Priority Date Filing Date
CN202020878155.6U Active CN212274310U (en) 2020-05-22 2020-05-22 Two-stage falling film screw type cold water/heat pump unit

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