CN114576880A - Single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit - Google Patents
Single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit Download PDFInfo
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- CN114576880A CN114576880A CN202210296136.6A CN202210296136A CN114576880A CN 114576880 A CN114576880 A CN 114576880A CN 202210296136 A CN202210296136 A CN 202210296136A CN 114576880 A CN114576880 A CN 114576880A
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- 238000007906 compression Methods 0.000 title claims abstract description 28
- 230000006835 compression Effects 0.000 title claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000010257 thawing Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit which comprises a shell and tube condenser, an economizer, a high-pressure liquid storage device, an evaporator, a fin heat exchanger, a four-way valve and a single-machine two-stage compressor, wherein the shell and tube condenser is connected with the economizer; the economizer is provided with an inlet and an outlet, one outlet of the economizer is communicated with an inlet of the high-pressure liquid storage device through a pipeline, an electronic expansion valve B is installed on the pipeline, and the other outlet of the economizer is connected with an air suction port B of the single-machine two-stage compressor through a pipeline; the single-machine two-stage compressor is internally provided with a low-pressure compressor cavity and a high-pressure compressor cavity, a pair of intermeshing male and female rotors in each compressor cavity, the low-pressure compressor cavity is provided with an air suction port B, and the high-pressure compressor cavity is provided with an air suction port A. The invention combines the single-machine two-stage screw compression technology with the air-supplying enthalpy-increasing technology, improves the enthalpy value of the refrigerant after absorbing heat in the ultralow temperature environment, improves the energy efficiency ratio of the unit, and realizes the high-quality operation of the unit in the ultralow temperature environment.
Description
Technical Field
The invention relates to an air source heat pump unit, in particular to a single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit, and belongs to the technical field of heat pump units.
Background
Currently, heat pumps are mainly divided into three major categories: the system comprises a water source heat pump, a ground source heat pump and an air source heat pump, wherein the air source heat pump is the least limited by conditions, the largest in development space and the most extensive in application range. The air source heat pump unit can absorb low-grade energy from the atmospheric environment, and convert the low-grade energy into high-grade energy for heating. Meanwhile, the air source heat pump unit is simple and flexible to install, has strong environmental adaptability, basically does not pollute the using area, and is very suitable for vast cold areas in winter without central heating. However, the common air source heat pump type unit can only be operated in the environment of not lower than-10 ℃ in practice due to the limitation of the operation range, the operation characteristics and the requirements of the compressor. Under the condition that the outdoor environment temperature is lower than minus 10 ℃, the heating capacity and the efficiency of the unit are obviously reduced, and under the low-temperature environment, the heat pump system also has the problems of liquid return, high exhaust temperature, over-range operation and the like.
Air source heat pumps are the most widely used of many types of heat pumps with their unique advantages, but their application is limited by climatic conditions. Along with the continuous decline of outdoor temperature, indoor heating heat load can constantly increase, and domestic and foreign traditional air source heat pump has the following problem simultaneously:
(1) along with the reduction of outdoor temperature, the air suction specific volume of the refrigerant is increased, and the air suction quantity of the unit is rapidly reduced, so that the heating quantity of a heat pump system is reduced, and the maximum indoor heating heat load cannot be met;
(2) the discharge temperature of the compressor rapidly increases due to the increasing compression ratio of the compressor. At very low outdoor temperatures, the compressor can be automatically stopped for protection due to overheating prevention, so that the heat pump can only operate at not too low outdoor air temperature;
(3) the coefficient of performance (COP) of the system drops dramatically due to the increase in compressor pressure ratio.
In summary, the conventional air source heat pump obviously has inconvenience and defects in practical use, so a new heat pump unit is needed to solve the bottleneck in the prior art.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit, which combines a single-machine two-stage screw compression technology with an air supply enthalpy increasing technology, improves the enthalpy value of a refrigerant after absorbing heat in an ultra-low temperature environment, improves the energy efficiency ratio of the unit, and realizes high-quality operation of the unit in the ultra-low temperature environment.
In order to solve the technical problems, the invention adopts the following technical scheme:
a single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit comprises a shell and tube condenser, an economizer, a high-pressure liquid storage device, an evaporator, a fin heat exchanger, a four-way valve and a single-machine two-stage compressor;
the economizer is provided with an inlet and an outlet, one outlet of the economizer is communicated with an inlet of the high-pressure liquid storage device through a pipeline, and an electronic expansion valve B is arranged on the pipeline; the other outlet of the economizer is connected with an air suction port B of the single-machine two-stage compressor through a pipeline;
the single-machine two-stage compressor is provided with an air suction port A, an air suction port B and an air exhaust port; the single-machine two-stage compressor is internally provided with a low-pressure compressor cavity and a high-pressure compressor cavity, each compressor cavity is internally provided with a pair of male and female rotors which are meshed with each other, the low-pressure compressor cavity is provided with an air suction port B, and the high-pressure compressor cavity is provided with an air suction port A.
According to the optimization scheme, a cold water inlet, a hot water gap, a refrigerant outlet and a refrigerant inlet are arranged on a shell and tube condenser, cold water enters the shell and tube condenser from the cold water inlet to exchange heat, and is discharged from the hot water gap after heat exchange; the refrigerant outlet is connected with the inlet of the economizer through a pipeline, and an electronic expansion valve A and a one-way valve A which are arranged in parallel are arranged on the pipeline.
Further, the outlet of the high-pressure liquid storage device is connected with the refrigerant inlet of the evaporator through a pipeline, wherein a stop valve B and a capillary tube and a check valve B which are arranged in parallel are installed on the pipeline, the stop valve B is arranged close to the high-pressure liquid storage device, and the capillary tube and the check valve B are arranged close to the evaporator.
Furthermore, the number of the evaporators is eight, the evaporators are provided with refrigerant inlets and refrigerant outlets, the evaporators are further connected with a fan through pipelines, and the refrigerants are subjected to forced heat exchange with outside air through the fan in the evaporators to absorb outside heat.
Further, a refrigerant outlet of the evaporator is connected with an inlet port of the four-way valve through a pipeline, wherein a stop valve A is arranged on the pipeline.
Furthermore, the four-way valve is provided with two inlets and two outlets, one outlet port of the four-way valve is connected with an air suction port A of the single-machine two-stage compressor through a pipeline, and a gas-liquid separator and a low-pressure switch are sequentially arranged on the pipeline; one outlet port of the four-way valve is connected with a refrigerant inlet of the shell and tube condenser through a pipeline.
Furthermore, the exhaust port is connected with the inlet end of the three-way valve through a pipeline, and a high-pressure switch is arranged on the pipeline; the three-way valve is provided with an inlet and an outlet; one outlet of the three-way valve is connected with a refrigerant inlet of the fin heat exchanger through a pipeline, and a stop valve C is arranged on the pipeline; the other outlet of the three-way valve is connected with one inlet port of the four-way valve through a pipeline.
Furthermore, the fin heat exchanger is provided with a refrigerant inlet and a refrigerant outlet, and is also connected with the buffer water tank through a pipeline, and a water pump is installed on the pipeline.
Furthermore, a refrigerant outlet of the fin heat exchanger is connected with an inlet port of the four-way valve through a pipeline, and a stop valve D and a one-way valve C are sequentially arranged on the pipeline.
After the technical scheme is adopted, compared with the prior art, the invention has the following advantages:
the single-machine two-stage compressor adopts a high-low pressure stage modularized design, realizes the interchange of different high-low pressure stages, and can realize the optimal operation of a unit by matching a reasonable displacement ratio according to the actual working condition;
the invention adopts an enhanced vapor injection system, a single-machine two-stage compressor is provided with two air suction ports, the final compression temperature of the main cycle is cooled by sucking steam in the middle, the compression process is divided into two completely disconnected sections by the vapor supplement process and becomes a two-stage compression process, the exhaust temperature is reduced by air injection, the exhaust superheat degree is reduced at the same time, the length of a gas phase heat exchange zone of a shell and tube condenser is reduced, the two-phase heat exchange area is increased, the heat exchange efficiency of the shell and tube condenser is improved, and when the difference between the evaporation temperature and the condensation temperature is larger, the better effect can be generated compared with a non-enhanced vapor compressor, so the effect is more obvious in a low-temperature environment; according to the invention, a single-machine two-stage screw compression technology is combined with an air-supplying enthalpy-increasing technology, so that the enthalpy value of a refrigerant after heat absorption in an ultralow temperature environment is improved, the energy efficiency ratio of a unit is improved, and the high-quality operation of the unit in the ultralow temperature environment is realized;
the invention effectively improves the low-temperature heating capacity of the heat pump system, solves the defect of insufficient low-temperature heating capacity of the system, and can stably operate in the environment of-35 ℃ at the lowest; hot water with the temperature of 60 ℃ can be prepared at the environment temperature of-35 ℃; at the temperature of-25 ℃ to 15 ℃ and the environment temperature, hot water at 75 ℃ can be prepared, and the heat demand of heating and other industries can be met.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a rear view of the structure of the present invention;
FIG. 3 is a top view of the structure of the present invention;
fig. 4 is a flow chart of the present invention.
In the figure, 1-shell and tube condenser, 2-economizer, 3-electronic expansion valve A, 4-one-way valve A, 5-high pressure liquid storage device, 6-electronic expansion valve B, 7-evaporator, 8-stop valve B, 9-capillary tube, 10-one-way valve B, 11-four-way valve, 12-stop valve A, 13-gas-liquid separator, 14-single-machine two-stage compressor, 15-air inlet A, 16-air inlet B, 17-air outlet, 18-low pressure switch, 19-three-way valve, 20-high pressure switch, 21-fin heat exchanger, 22-stop valve C, 23-stop valve D, 24-one-way valve C, 25-buffer water tank, 26-water pump and 27-fan.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1-4, the invention provides a single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit, which comprises a shell and tube condenser 1, an economizer 2, a high-pressure liquid storage device 5, an evaporator 7, a fin heat exchanger 21, a four-way valve 11 and a single-machine two-stage compressor 14.
The shell and tube condenser 1 is provided with a cold water inlet, a hot water port, a refrigerant outlet and a refrigerant inlet, cold water enters the shell and tube condenser 1 from the cold water inlet for heat exchange, and is discharged from the hot water port after heat exchange; the refrigerant outlet is connected with the inlet of the economizer 2 through a pipeline, and an electronic expansion valve A3 and a check valve A4 which are arranged in parallel are arranged on the pipeline.
The economizer 2 is provided with an inlet and an outlet, one outlet of the economizer 2 is communicated with an inlet of a high-pressure liquid storage device 5 through a pipeline, and an electronic expansion valve B6 is arranged on the pipeline; the other outlet of the economizer 2 is connected by a line to the suction B16 of the single stage two stage compressor 14.
The outlet of the high-pressure liquid storage device 5 is connected with the refrigerant inlet of the evaporator 7 through a pipeline, wherein a stop valve B8, a capillary tube 9 and a check valve B10 which are arranged in parallel are installed on the pipeline, the stop valve B8 is arranged close to the high-pressure liquid storage device 5, and the capillary tube 9 and the check valve B10 are arranged close to the evaporator 7.
The number of the evaporators 7 is eight, the evaporators 7 are provided with refrigerant inlets and refrigerant outlets, the evaporators 7 are also connected with a fan 27 through pipelines, and the refrigerant is subjected to forced heat exchange with outside air through the fan 27 in the evaporators 7 to absorb outside heat and is changed into a gaseous refrigerant with a certain superheat degree.
The refrigerant outlet of the evaporator 7 is connected with an inlet port of the four-way valve 11 through a pipeline, wherein a stop valve A12 is arranged on the pipeline; the four-way valve 11 is provided with two inlets and two outlets, one outlet port of the four-way valve 11 is connected with an air suction port A15 of the single-machine two-stage compressor 14 through a pipeline, and the pipeline is sequentially provided with a gas-liquid separator 13 and a low-pressure switch 18; one outlet port of the four-way valve 11 is connected to the refrigerant inlet of the shell-and-tube condenser 1 through a pipe.
The single-machine two-stage compressor 14 is provided with an air suction port A15, an air suction port B16 and an air exhaust port 17; a low-pressure compressor cavity and a high-pressure compressor cavity are arranged in the single-machine two-stage compressor 14, a pair of mutually meshed male and female rotors rotating according to a certain transmission ratio are arranged in each compressor cavity, and the male and female rotors generate periodic volume change to finish the suction, compression and discharge of refrigerant gas; the low pressure compressor cavity is provided with an air suction port B16, and the high pressure compressor cavity is provided with an air suction port A15.
The exhaust port 17 is connected with the inlet end of a three-way valve 19 through a pipeline, and a high-pressure switch 20 is arranged on the pipeline; the three-way valve 19 is provided with one inlet and two outlets; one outlet of the three-way valve 19 is connected with a refrigerant inlet of the fin heat exchanger 21 through a pipeline, and a stop valve C22 is arranged on the pipeline; the other outlet of the three-way valve 19 is connected to an inlet of the four-way valve 11 through a pipe.
The finned heat exchanger 21 is provided with a refrigerant inlet and a refrigerant outlet, the finned heat exchanger 21 is further connected with the buffer water tank 25 through a pipeline, the water pump 26 is installed on the pipeline, the buffer water tank 25 can guarantee that in the defrosting process, certain temperature exists in the buffer water tank 25, efficient defrosting can be achieved, defrosting time is shortened, heat consumption is reduced, fluctuation caused by indoor temperature due to host defrosting is avoided, and the terminal effect of the stable system is also achieved.
The refrigerant outlet of the finned heat exchanger 21 is connected with an inlet port of the four-way valve 11 through a pipeline, and a stop valve D23 and a check valve C24 are sequentially arranged on the pipeline.
The specific working principle of the invention is as follows:
low-temperature low-pressure refrigerant gas from a low-pressure system enters a low-pressure compressor cavity of a single-machine two-stage compressor 14 after being sucked and filtered, the low-temperature low-pressure refrigerant gas is compressed and mixed with medium-temperature medium-pressure gas from an evaporator 7 and then enters a high-pressure compressor cavity of the single-machine two-stage compressor 14 to be compressed into high-temperature high-pressure gas again, the high-temperature high-pressure gas is discharged after being separated from oil, the discharged high-temperature high-pressure gas enters a shell and tube condenser 1 through a four-way valve 11 to exchange heat with water, the refrigerant heated by the water is changed into high-pressure liquid, the liquid refrigerant is divided into a main refrigeration circuit and an auxiliary air supply circuit, the refrigerant liquid in the main circuit and the auxiliary circuit generates heat exchange in an economizer 2, the refrigerant in the auxiliary circuit is changed into gas and then is sucked through a gas suction port B16 of the single-machine two-stage compressor 14, the refrigerant in the main circuit is changed into subcooled liquid and then enters an evaporator 7 after being depressurized through an electronic expansion valve B6, the refrigerant in the evaporator 7 is evaporated and then is sucked through a gas suction port A15 of the single-machine two-stage compressor 14, the refrigerant of the main path and the refrigerant of the auxiliary path are mixed in the single-unit two-stage compressor 14, further compressed and discharged, and then enter the shell-and-tube condenser 1, thereby forming a closed working cycle.
The single-machine two-stage compressor adopts a high-low pressure stage modularized design, realizes the interchange of different high-low pressure stages, and can realize the optimal operation of a unit by matching a reasonable displacement ratio according to the actual working condition;
the invention adopts an enhanced vapor injection system, a single-machine two-stage compressor is provided with two air suction ports, the final compression temperature of the main cycle is cooled by sucking steam in the middle, the compression process is divided into two completely disconnected sections by the vapor supplement process and becomes a two-stage compression process, the exhaust temperature is reduced by air injection, the exhaust superheat degree is reduced at the same time, the length of a gas phase heat exchange zone of a shell and tube condenser is reduced, the two-phase heat exchange area is increased, the heat exchange efficiency of the shell and tube condenser is improved, and when the difference between the evaporation temperature and the condensation temperature is larger, the better effect can be generated compared with a non-enhanced vapor compressor, so the effect is more obvious in a low-temperature environment; the invention combines the single-machine two-stage screw compression technology with the air-supplying enthalpy-increasing technology, improves the enthalpy value of the refrigerant after absorbing heat in the ultralow temperature environment, improves the energy efficiency ratio of the unit, and realizes the high-quality operation of the unit in the ultralow temperature environment.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent changes based on the technical teaching of the present invention are also within the protection scope of the present invention.
Claims (9)
1. The utility model provides a unit doublestage screw rod compression ultra-large-scale ultra-low temperature air source heat pump set which characterized in that: the device comprises a shell and tube condenser (1), an economizer (2), a high-pressure liquid storage device (5), an evaporator (7), a finned heat exchanger (21), a four-way valve (11) and a single-unit two-stage compressor (14);
the economizer (2) is provided with an inlet and an outlet, one outlet of the economizer (2) is communicated with an inlet of the high-pressure liquid storage device (5) through a pipeline, and an electronic expansion valve B (6) is arranged on the pipeline; the other outlet of the economizer (2) is connected with an air suction port B (16) of the single-machine two-stage compressor (14) through a pipeline;
the single-machine two-stage compressor (14) is provided with an air suction port A (15), an air suction port B (16) and an air exhaust port (17); the single-machine two-stage compressor (14) is internally provided with a low-pressure compressor cavity and a high-pressure compressor cavity, each compressor cavity is internally provided with a pair of intermeshing male and female rotors, the low-pressure compressor cavity is provided with an air suction port B (16), and the high-pressure compressor cavity is provided with an air suction port A (15).
2. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 1, characterized in that: the shell and tube condenser (1) is provided with a cold water inlet, a hot water port, a refrigerant outlet and a refrigerant inlet, cold water enters the shell and tube condenser (1) from the cold water inlet for heat exchange, and is discharged from the hot water port after heat exchange; the refrigerant outlet is connected with the inlet of the economizer (2) through a pipeline, and an electronic expansion valve A (3) and a check valve A (4) which are arranged in parallel are installed on the pipeline.
3. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 1, characterized in that: the outlet of the high-pressure liquid storage device (5) is connected with the refrigerant inlet of the evaporator (7) through a pipeline, wherein a stop valve B (8) and a capillary tube (9) and a check valve B (10) which are arranged in parallel are installed on the pipeline, the stop valve B (8) is arranged close to the high-pressure liquid storage device (5), and the capillary tube (9) and the check valve B (10) are arranged close to the evaporator (7).
4. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 1, characterized in that: the number of the evaporators (7) is eight, the evaporators (7) are provided with refrigerant inlets and refrigerant outlets, the evaporators (7) are further connected with a fan (27) through pipelines, and the refrigerant is in forced heat exchange with outside air through the fan (27) in the evaporators (7) to absorb outside heat.
5. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 4, characterized in that: the refrigerant outlet of the evaporator (7) is connected with one inlet port of the four-way valve (11) through a pipeline, wherein a stop valve A (12) is arranged on the pipeline.
6. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 1, characterized in that: the four-way valve (11) is provided with two inlets and two outlets, one outlet port of the four-way valve (11) is connected with an air suction port A (15) of the single-machine two-stage compressor (14) through a pipeline, and a gas-liquid separator (13) and a low-pressure switch (18) are sequentially arranged on the pipeline; one outlet port of the four-way valve (11) is connected with a refrigerant inlet of the shell and tube condenser (1) through a pipeline.
7. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 1, characterized in that: the exhaust port (17) is connected with the inlet end of the three-way valve (19) through a pipeline, and a high-pressure switch (20) is arranged on the pipeline; the three-way valve (19) is provided with an inlet and an outlet; one outlet of the three-way valve (19) is connected with a refrigerant inlet of the fin heat exchanger (21) through a pipeline, and a stop valve C (22) is arranged on the pipeline; the other outlet of the three-way valve (19) is connected with one inlet port of the four-way valve (11) through a pipeline.
8. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 1, characterized in that: the finned heat exchanger (21) is provided with a refrigerant inlet and a refrigerant outlet, the finned heat exchanger (21) is also connected with a buffer water tank (25) through a pipeline, and a water pump (26) is installed on the pipeline.
9. The single-machine two-stage screw compression ultra-large ultra-low temperature air source heat pump unit as claimed in claim 8, wherein: the refrigerant outlet of the finned heat exchanger (21) is connected with one inlet port of the four-way valve (11) through a pipeline, and a stop valve D (23) and a one-way valve C (24) are sequentially arranged on the pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210296136.6A CN114576880A (en) | 2022-03-24 | 2022-03-24 | Single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit |
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| CN202210296136.6A CN114576880A (en) | 2022-03-24 | 2022-03-24 | Single-machine two-stage screw compression ultra-large ultralow temperature air source heat pump unit |
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| CN114576880A true CN114576880A (en) | 2022-06-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105021A (en) * | 2013-01-22 | 2013-05-15 | 秦海涛 | Refrigeration heat pump unit of carbon dioxide (CO2) transcritical cycle and control method thereof |
| CN105758055A (en) * | 2016-05-05 | 2016-07-13 | 山东现代莱恩空调设备有限公司 | Ultralow temperature total heat recovery air-cooling heat pump unit |
| CN108131860A (en) * | 2018-02-02 | 2018-06-08 | 北京中科华誉热泵设备制造有限公司 | A kind of ultra-low temperature air source heat pump based on single machine compression with double stage machine |
| CN108489130A (en) * | 2018-06-06 | 2018-09-04 | 深圳市派沃新能源科技股份有限公司 | A kind of screw single machine three stage compression heat pump heating system and control method |
| CN217636259U (en) * | 2022-03-24 | 2022-10-21 | 山东阿尔普尔节能装备有限公司 | Ultralow-temperature air source enhanced vapor injection system |
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2022
- 2022-03-24 CN CN202210296136.6A patent/CN114576880A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105021A (en) * | 2013-01-22 | 2013-05-15 | 秦海涛 | Refrigeration heat pump unit of carbon dioxide (CO2) transcritical cycle and control method thereof |
| CN105758055A (en) * | 2016-05-05 | 2016-07-13 | 山东现代莱恩空调设备有限公司 | Ultralow temperature total heat recovery air-cooling heat pump unit |
| CN108131860A (en) * | 2018-02-02 | 2018-06-08 | 北京中科华誉热泵设备制造有限公司 | A kind of ultra-low temperature air source heat pump based on single machine compression with double stage machine |
| CN108489130A (en) * | 2018-06-06 | 2018-09-04 | 深圳市派沃新能源科技股份有限公司 | A kind of screw single machine three stage compression heat pump heating system and control method |
| CN217636259U (en) * | 2022-03-24 | 2022-10-21 | 山东阿尔普尔节能装备有限公司 | Ultralow-temperature air source enhanced vapor injection system |
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