WO2018003699A1 - Climatiseur - Google Patents

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Publication number
WO2018003699A1
WO2018003699A1 PCT/JP2017/023230 JP2017023230W WO2018003699A1 WO 2018003699 A1 WO2018003699 A1 WO 2018003699A1 JP 2017023230 W JP2017023230 W JP 2017023230W WO 2018003699 A1 WO2018003699 A1 WO 2018003699A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
heat exchanger
heat source
source side
connection pipe
Prior art date
Application number
PCT/JP2017/023230
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English (en)
Japanese (ja)
Inventor
明敏 上野
Original Assignee
ダイキン工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017113378A external-priority patent/JP6341321B2/ja
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to CN201780040641.1A priority Critical patent/CN109416204A/zh
Publication of WO2018003699A1 publication Critical patent/WO2018003699A1/fr

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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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B39/00—Evaporators; Condensers

Definitions

  • This disclosure relates to air conditioners.
  • Patent Literature 1 includes an air conditioner that performs a cooling operation that includes a refrigerant circuit having a compressor, a condenser (heat source side heat exchanger), an expansion mechanism, and an evaporator (use side heat exchanger) to cool the cabin.
  • An apparatus is disclosed.
  • the condenser is comprised with the shell and tube type heat exchanger.
  • the condenser includes a shell formed in a cylindrical shape and a plurality of heat transfer tubes provided inside the shell.
  • a refrigerant inlet pipe is provided at the upper part of the shell, and a refrigerant outlet pipe is provided at the lower part of the shell.
  • the refrigerant that has flowed into the shell from the refrigerant inlet pipe flows from the upper side to the lower side of the shell and flows out from the refrigerant outlet pipe.
  • the refrigerant flowing from the top to the bottom in the shell is cooled by exchanging heat with the cooling water flowing through the plurality of heat transfer tubes.
  • the heat source side heat exchanger becomes a condenser and the use side heat exchanger becomes an evaporator.
  • the heat source side heat exchanger is configured by a shell-and-tube heat exchanger. That is, it is conceivable to configure the heat source side heat exchanger so that the refrigerant flows in the vertical direction in the heat source side heat exchanger.
  • the refrigerant discharged from the compressor flows from the top to the bottom of the heat source side heat exchanger, and in the heating operation, the refrigerant flowing out of the expansion mechanism
  • the inside of the heat source side heat exchanger flows from below to above.
  • the heating operation when the refrigerating machine oil is separated from the refrigerant (evaporated refrigerant) flowing from the lower side to the upper side inside the heat source side heat exchanger, the refrigerating machine oil flows from the upper side to the lower side due to gravity and the heat source It will accumulate in the inside of a side heat exchanger.
  • an oil return pipe is provided in the heat source side heat exchanger, and the refrigerating machine oil accumulated in the heat source side heat exchanger is removed from the oil return pipe. It is possible to let it flow out of.
  • the position where the refrigerating machine oil accumulates changes depending on factors such as the type of refrigerant, the type of refrigerating machine oil, and operating conditions (temperature and pressure). It is difficult to properly determine
  • an object of the present disclosure is to provide an air conditioner that can suppress accumulation of refrigeration oil in the heat source side heat exchanger.
  • a first aspect of the present disclosure includes a refrigerant circuit (20) having a compressor (21), a heat source side heat exchanger (23), an expansion mechanism (24), and a use side heat exchanger (25),
  • the heat source side heat exchanger (23) serves as a condenser, and the cooling operation in which the refrigerant circulates so that the use side heat exchanger (25) serves as an evaporator;
  • An air conditioner that switches between a heating operation in which a refrigerant circulates so that the heat source side heat exchanger (23) serves as an evaporator and the use side heat exchanger (25) serves as a condenser
  • the heat exchanger (23) includes a first refrigerant connection pipe (23a) and a second refrigerant connection pipe (23b), and the refrigerant flowing from the first refrigerant connection pipe (23a) is the heat source side heat exchanger.
  • the refrigerant circuit (20) is configured to flow from the top to the bottom and flow out of the second refrigerant connection pipe (23b).
  • the air conditioner is configured such that the flow direction of the refrigerant is a direction from the first refrigerant connection pipe (23a) toward the second refrigerant connection pipe (23b).
  • the refrigerant flow direction in the heat source side heat exchanger (23) can be changed from the upper side to the lower side in both the cooling operation and the heating operation. Therefore, even if the refrigeration oil is separated from the refrigerant flowing from the top to the bottom in the heat source side heat exchanger (23) in the heating operation, the refrigeration oil also flows from the top to the bottom due to gravity. Machine oil can flow out of the heat source side heat exchanger (23) together with the refrigerant.
  • the amount of reduced pressure of the refrigerant in the expansion mechanism (24) is adjusted according to the degree of superheat of the refrigerant that has flowed out of the heat source side heat exchanger (23) in the heating operation, so that the heat source during the heating operation is adjusted.
  • the refrigerant can be reliably evaporated in the side heat exchanger (23).
  • the heat source side heat exchanger (23) is configured by a shell-and-tube heat exchanger. Machine.
  • the heat source side heat exchanger (23) can be easily disassembled by configuring the heat source side heat exchanger (23) with a shell-and-tube heat exchanger.
  • the first refrigerant connection pipe (23a) of the heat source side heat exchanger (23) includes a condensation side refrigerant connection pipe ( 81) and a plurality of evaporation side refrigerant connection pipes (82), and the heat source side heat exchanger (23) includes the condensation side refrigerant connection pipe (81) or the plurality of evaporation side refrigerant connection pipes (82).
  • the refrigerant flowing in from the heat source side heat exchanger (23) flows from the upper side to the lower side and flows out from the second refrigerant connection pipe (23b), and the heat source side circuit part (30) Has a flow divider (80) for diverting the refrigerant, and the refrigerant discharged from the compressor (21) in the cooling operation is connected to the condensation side refrigerant connection pipe (81) of the heat source side heat exchanger (23).
  • the refrigerant that is supplied and flows out of the expansion mechanism (24) in the heating operation passes through the flow divider (80) and passes through the heat.
  • An air conditioner configured to be supplied to a plurality of evaporation side refrigerant connection pipes (82) of a source side heat exchanger (23).
  • the refrigerant flowing out from the expansion mechanism (24) in the heating operation passes through the flow divider (80) and is supplied to the plurality of evaporation side refrigerant connection pipes (82) of the heat source side heat exchanger (23).
  • the evaporation of the refrigerant in the heat source side heat exchanger (23) can be promoted.
  • the refrigeration oil is combined with the refrigerant at the heat source side. Since it can be made to flow out from a heat exchanger (23), accumulation of the refrigeration oil in a heat source side heat exchanger (23) can be suppressed.
  • the refrigerant can be reliably evaporated in the heat source side heat exchanger (23) during the heating operation, so that the liquid refrigerant is supplied from the heat source side heat exchanger (23) in the heating operation. Occurrence of a phenomenon (so-called liquid back phenomenon) that flows out and is sucked into the compressor (21) can be prevented.
  • the heat source side heat exchanger (23) can be easily disassembled, maintenance and inspection of the heat source side heat exchanger (23) can be facilitated.
  • FIG. 1 is a piping diagram illustrating a configuration example of an air conditioner according to an embodiment.
  • FIG. 2 is a longitudinal sectional view showing a configuration example of the heat source side heat exchanger.
  • FIG. 3 is a piping system diagram for explaining the cooling operation.
  • FIG. 4 is a piping diagram for explaining the heating operation.
  • FIG. 5 is a piping diagram showing a modification of the air conditioner.
  • the refrigerant circuit (20) includes a compressor (21), a four-way switching valve (22), a heat source side heat exchanger (23), an expansion mechanism (24), and a use side heat exchanger (25). It is configured to circulate and perform a vapor compression refrigeration cycle. Specifically, in the cooling operation, the refrigerant circulates in the refrigerant circuit (20) so that the heat source side heat exchanger (23) becomes a condenser and the use side heat exchanger (25) becomes a condenser.
  • the refrigerant circulates in the refrigerant circuit (20) so that the use side heat exchanger (25) serves as a condenser and the heat source side heat exchanger (23) serves as an evaporator.
  • the refrigerant circuit (20) has a heat source side circuit section (30) including a heat source side heat exchanger (23). Also, in the vicinity of the use side heat exchanger (25), to supply use side air (air supplied to the cooling target space, for example, air in a ship's cabin) to the use side heat exchanger (25).
  • the use side fan (26) is provided.
  • the compressor (21) is configured to compress and discharge the sucked refrigerant.
  • the compressor (21) is constituted by a hermetic scroll compressor. Further, refrigeration oil for lubricating the compressor (21) is stored inside the compressor (21). A part of the refrigerating machine oil circulates in the refrigerant circuit (20) together with the refrigerant.
  • the four-way switching valve (22) includes a first state (state indicated by a solid line in FIG. 1) in which the first port and the third port communicate with each other and the second port and the fourth port communicate with each other; And the fourth port communicate with each other and the second state communicates between the second port and the third port (state indicated by a broken line in FIG. 1).
  • the first port of the four-way selector valve (22) and the discharge port of the compressor (21) are connected to each other via the first refrigerant pipe (P1), and the second port of the four-way selector valve (22)
  • the suction port of the compressor (21) is connected to each other via the second refrigerant pipe (P2).
  • the third port of the four-way switching valve (22) and one end (connection point (Q1)) of the heat source side circuit portion (30) are connected to each other via the third refrigerant pipe (P3), and the four-way switching valve (22 )
  • the gas end of the use side heat exchanger (25) are connected to each other via a fourth refrigerant pipe (P4).
  • connection point (Q2) connection point (Q2) of the heat source side circuit unit (30) and one end (connection point (Q3)) of the expansion mechanism (24) are connected to each other via the fifth refrigerant pipe (P5).
  • connection point (Q4)) of the expansion mechanism (24) and the liquid end of the use side heat exchanger (25) are connected to each other via the sixth refrigerant pipe (P6).
  • the heat source side heat exchanger (23) is configured to exchange heat between the refrigerant and water (for example, seawater or fresh water).
  • the heat source side heat exchanger (23) has a first refrigerant connection pipe (23a) and a second refrigerant connection pipe (23b), and the refrigerant flowing from the first refrigerant connection pipe (23a) is the heat source. It is configured to flow from the upper side to the lower side of the side heat exchanger (23) (first flow path) and flow out from the second refrigerant connection pipe (23b).
  • the heat source side heat exchanger (23) includes a first refrigerant connection pipe (23a), a second refrigerant connection pipe (23b), a first water connection pipe (23c), and a second water connection pipe (23d). have. Further, the heat source side heat exchanger (23) has a first flow for circulating the refrigerant flowing in from the first refrigerant connection pipe (23a) from above to flowing out from the second refrigerant connection pipe (23b). And a second flow path for allowing water flowing in from the first water connection pipe (23c) to flow and out of the second water connection pipe (23d). The heat source side heat exchanger (23) is configured to exchange heat between the refrigerant flowing through the first flow path and the water flowing through the second flow path.
  • the heat source side heat exchanger (23) is constituted by a shell-and-tube heat exchanger.
  • the heat source side heat exchanger (23) includes a shell (71), a plurality of heat transfer tubes (72), and a support base (73).
  • the shell (71) is formed in a cylindrical shape closed at both ends.
  • the internal space of the shell (71) is partitioned into three spaces by first and second partition plates (71a, 71b) that are spaced apart in the axial direction of the shell (71), and the first partition plate (71a)
  • the space between the first partition plate (71b) and the second partition plate (71b) forms a refrigerant chamber (S10), and the space between the first partition plate (71a) and one end of the shell (71) (the first partition in FIG. 2).
  • the space on the right side of the plate (71a) constitutes the first header space (S11), and the space between the second partition plate (71b) and the other end of the shell (71) (the second partition plate in FIG.
  • the first refrigerant connection pipe (23a) is provided on the upper part of the shell (71) and communicates with the refrigerant chamber (S10).
  • the second refrigerant connection pipe (23b) is provided at the lower part of the shell (71) and communicates with the refrigerant chamber (S10).
  • the first and second water connection pipes (23c, 23d) are provided at one end (the right end in FIG. 2) of the shell (71) and communicate with the first and second water chambers (S15, S16), respectively. Yes.
  • the plurality of heat transfer tubes (72) are provided in the refrigerant chamber (S10) and extend in the axial direction of the shell (71), respectively, and one end thereof penetrates the first partition plate (71a) to form the first header space ( S11) communicates with the other end of the second partition plate (71b) and communicates with the second header space (S12).
  • the support base (73) supports the shell (71) so that the axial direction of the shell (71) faces the horizontal direction.
  • the refrigerant flowing into the refrigerant chamber (S10) from the first refrigerant connection pipe (23a) flows from the upper side to the lower side in the refrigerant chamber (S10). It flows out of the chamber (S10) to the second refrigerant connection pipe (23b).
  • the water flowing into the first water chamber (S15) from the first water connection pipe (23c) is a part of the plurality of heat transfer pipes (72) (in FIG. 2, on the front side of the page with respect to the third partition plate (71c)).
  • the expansion mechanism (24) is configured to depressurize the refrigerant.
  • the expansion mechanism (24) is configured to be able to adjust the amount of decompression of the refrigerant.
  • the decompression amount of the refrigerant in the expansion mechanism (24) is adjusted according to the degree of superheat of the refrigerant flowing out from the use side heat exchanger (25).
  • the refrigerant flows out from the heat source side heat exchanger (23).
  • the decompression amount of the refrigerant in the expansion mechanism (24) is adjusted according to the degree of superheat of the refrigerant.
  • the expansion mechanism (24) has a first expansion valve (41) and a second expansion valve (42), and from the heat source side heat exchanger (23) to the first expansion valve (41) in the cooling operation.
  • the refrigerant flows toward the use side heat exchanger (25) via the heat source, and in the heating operation, the heat source side heat exchanger (23) passes through the second expansion valve (42) and the use side heat exchanger (25). It is comprised so that a refrigerant
  • coolant may flow toward.
  • the first and second expansion valves (41, 42) are constituted by temperature-sensitive expansion valves (temperature automatic expansion valves). Specifically, the first and second expansion valves (41, 42) have first and second temperature sensing tubes (41a, 42a), respectively. The first and second temperature sensing tubes (41a, 42a) are filled with the same refrigerant as the refrigerant circulating in the refrigerant circuit (20).
  • the first temperature sensing cylinder (41a) is attached to a pipe (in this example, the second refrigerant pipe (P2)) through which the refrigerant flowing out from the use side heat exchanger (25) flows in the cooling operation
  • the second temperature sensing cylinder ( 42a) is attached to a pipe (in this example, the second refrigerant connection pipe (23b) of the heat source side heat exchanger (23)) through which the refrigerant flowing out from the heat source side heat exchanger (23) flows in the heating operation.
  • the first and second expansion valves (41, 42) are configured such that their opening degrees are automatically adjusted according to the temperatures of the first and second temperature sensing tubes (41a, 42a), respectively. .
  • the first and second expansion valves (41, 42) may be constituted by external pressure equalization type temperature automatic expansion valves. Specifically, the first and second expansion valves (41, 42) may have first and second temperature sensing tubes (41a, 42a) and first and second pressure equalizing tubes, respectively.
  • the pressure equalizing pipe (first pressure equalizing pipe) of the first expansion valve (41) is connected to a pipe (in this example, the second refrigerant pipe (P2)) through which the refrigerant flowing out from the use side heat exchanger (25) flows in the cooling operation.
  • the pressure equalizing pipe (second pressure equalizing pipe) of the second expansion valve (42) is a pipe (in this example, the heat source side heat exchanger (23) through which the refrigerant flowing out from the heat source side heat exchanger (23) flows in the heating operation.
  • the first expansion valve (41) is configured such that the opening degree is automatically adjusted according to the temperature of the first temperature sensing cylinder (41a) and the refrigerant pressure in the first pressure equalizing pipe, and the second expansion valve (41).
  • the valve (42) is configured such that the opening degree is automatically adjusted according to the temperature of the second temperature sensing cylinder (42a) and the refrigerant pressure in the second pressure equalizing pipe.
  • the second main pipe (52) is a pipe for flowing a refrigerant between the heat source side circuit section (30) and the use side heat exchanger (25) via the second expansion valve (42).
  • the second main pipe (52) is provided with a second expansion valve (42).
  • the second main pipe (52) has one end connected to one end of the intermediate pipe (50) and the other end connected to the other end of the heat source side circuit section (30) via the fifth refrigerant pipe (P5). (Connecting point (Q2)).
  • the first bypass pipe (53) is a pipe for bypassing the first expansion valve (41) and allowing the refrigerant to flow between the heat source side circuit section (30) and the use side heat exchanger (25).
  • the first bypass pipe (53) has one end connected to the other end of the intermediate pipe (50) and the other end connected to the use side heat exchanger (25) via the sixth refrigerant pipe (P6). Connected to the liquid end.
  • the first bypass pipe (53) is provided with a first filter (55) and a first bypass check valve (57).
  • the first bypass check valve (57) is a refrigerant flow from the use side heat exchanger (25) side to the heat source side circuit section (30) side (in this example, from the sixth refrigerant pipe (P6) to the intermediate pipe ( 50), only the refrigerant flow toward the other end is allowed.
  • the second bypass pipe (54) is a pipe for allowing the refrigerant to flow between the heat source side circuit section (30) and the use side heat exchanger (25), bypassing the second expansion valve (42).
  • the second bypass pipe (54) has one end connected to the other end of the intermediate pipe (50) and the other end connected to the heat source side circuit section (30) via the fifth refrigerant pipe (P5). Connected to the other end (connection point (Q2)).
  • the second bypass pipe (54) is provided with a second filter (56) and a second bypass check valve (58).
  • the second bypass check valve (58) is a refrigerant flow from the heat source side circuit section (30) side to the use side heat exchanger (25) side (in this example, from the fifth refrigerant pipe (P5) to the intermediate pipe ( 50), only the refrigerant flow toward the other end is allowed.
  • the use side heat exchanger (25) is configured to exchange heat between the refrigerant and the use side air (air supplied to the cooling target space) conveyed by the use side fan (26).
  • the use side heat exchanger (25) is a fin-and-tube heat exchanger.
  • Heat source side circuit section In the heat source side circuit unit (30), the flow direction of the refrigerant passing through the heat source side heat exchanger (23) in both the cooling operation and the heating operation is changed from the first refrigerant connection tube (23a) to the second refrigerant connection tube (23b). It is comprised so that it may become the direction which goes to.
  • the heat source side circuit section (30) includes first to fourth connection pipes (31 to 34) and first to fourth check valves (35 to 38).
  • the first connection pipe (31) is connected to the first refrigerant connection pipe (23a) of the heat source side heat exchanger (23), and the other end is connected to the four-way switching valve (P3) via the third refrigerant pipe (P3). 22) connected to the third port.
  • the first check valve (35) is provided in the first connection pipe (31) and is connected to the heat source side heat exchanger (23) from the third refrigerant pipe (P3) side (that is, the four-way switching valve (22) side). Only the flow of the refrigerant toward the first refrigerant connection pipe (23a) side is allowed.
  • the third connection wiring (33) is connected to the second refrigerant connection pipe (23b) of the heat source side heat exchanger (23), and the other end is connected to the expansion mechanism (24 via the fifth refrigerant pipe (P5)). ) Is connected to one end (connection point (Q3)).
  • the third check valve (37) is provided on the third connection wiring (33) and extends from the second refrigerant connection pipe (23b) side of the heat source side heat exchanger (23) to the fifth refrigerant pipe (P5) side (that is, , Only the refrigerant flow toward the expansion mechanism (24 side) is allowed.
  • the fourth connection wiring (34) is connected to the second refrigerant connection pipe (23b) of the heat source side heat exchanger (23), and the other end is connected to the four-way switching valve (P3) via the third refrigerant pipe (P3). 22) connected to the third port.
  • the fourth check valve (38) is provided on the fourth connection wiring (34) and extends from the second refrigerant connection pipe (23b) side of the heat source side heat exchanger (23) to the third refrigerant pipe (P3) side (that is, The refrigerant flow only toward the four-way switching valve (22 side) is allowed.
  • the cooling operation will be described with reference to FIG.
  • the four-way switching valve (22) is set to the first state.
  • the discharge port of the compressor (21) and the heat source side circuit part (30) communicate with each other, and the suction port of the compressor (21) communicates with the gas end of the use side heat exchanger (25).
  • the compressor (21) and the use-side fan (26) are set to the driving state.
  • the refrigerant circulates in the refrigerant circuit (20) so that a refrigeration cycle in which the heat source side heat exchanger (23) serves as a condenser and the use side heat exchanger (25) serves as an evaporator is performed.
  • the decompression amount of the refrigerant in the expansion mechanism (24) is adjusted according to the degree of superheat of the refrigerant flowing out from the gas end of the use side heat exchanger (25).
  • the superheat degree of the refrigerant flowing out from the gas end of the use side heat exchanger (25) becomes a predetermined target superheat degree.
  • the opening degree of the one expansion valve (41) is automatically adjusted.
  • the refrigerant discharged from the compressor (21) passes through the four-way switching valve (22) and flows into the heat source side circuit section (30).
  • the refrigerant flowing into the heat source side circuit section (30) passes through the first check valve (35) and flows into the first refrigerant connection pipe (23a) of the heat source side heat exchanger (23).
  • the refrigerant flowing in from the first refrigerant connection pipe (23a) passes through the interior of the heat source side heat exchanger (23) (specifically, the refrigerant chamber (S10)) in the vertical direction.
  • While flowing downward from the heat source side heat exchanger (23) (specifically, the heat transfer pipe (72)) dissipates heat and condenses, and then the second refrigerant connection pipe (23b) Spill from.
  • the refrigerant that has flowed out of the second refrigerant connection pipe (23b) of the heat source side heat exchanger (23) passes through the third check valve (37) and flows into the expansion mechanism (24).
  • the refrigerant that has flowed into the expansion mechanism (24) sequentially passes through the second filter (56), the second bypass check valve (58), and the intermediate pipe (50), and flows into the first expansion valve (41). The pressure is reduced at the first expansion valve (41).
  • the refrigerant decompressed in the first expansion valve (41) flows into the use side heat exchanger (25) and evaporates by absorbing heat from the use side air in the use side heat exchanger (25). Thereby, utilization side air is cooled and the air-conditioning object space is cooled.
  • the refrigerant flowing out from the use side heat exchanger (25) passes through the four-way switching valve (22) and is sucked into the compressor (21).
  • the heating operation will be described with reference to FIG.
  • the four-way selector valve (22) is set to the second state.
  • the discharge port of the compressor (21) communicates with the gas end of the use side heat exchanger (25), and the suction port of the compressor (21) communicates with the heat source side circuit unit (30).
  • the compressor (21) and the use-side fan (26) are set to the driving state.
  • the refrigerant circulates in the refrigerant circuit (20) so that a refrigeration cycle is performed in which the use side heat exchanger (25) serves as a condenser and the heat source side heat exchanger (23) serves as an evaporator.
  • the amount of decompression of the refrigerant in the expansion mechanism (24) is adjusted according to the degree of superheat of the refrigerant flowing out from the second refrigerant connection pipe (23b) of the heat source side heat exchanger (23).
  • the second temperature sensing cylinder (42a) is set so that the superheat degree of the refrigerant flowing out from the second refrigerant connection pipe (23b) of the heat source side heat exchanger (23) becomes a predetermined target superheat degree.
  • the opening degree of the second expansion valve (42) is automatically adjusted in accordance with the temperature.
  • the refrigerant discharged from the compressor (21) passes through the four-way switching valve (22), flows into the use side heat exchanger (25), and dissipates heat to the use side air in the use side heat exchanger (25). Condensate. Thereby, utilization side air is heated and the air-conditioning object space is heated.
  • the refrigerant that has flowed out of the use side heat exchanger (25) flows into the expansion mechanism (24).
  • the refrigerant that has flowed into the expansion mechanism (24) sequentially passes through the first filter (55), the first bypass check valve (57), and the intermediate pipe (50), and flows into the second expansion valve (42). The pressure is reduced at the second expansion valve (42).
  • the refrigerant that has flowed out of the second expansion valve (42) flows into the heat source side circuit section (30).
  • the refrigerant flowing into the heat source side circuit section (30) passes through the second check valve (36) and flows into the first refrigerant connection pipe (23a) of the heat source side heat exchanger (23).
  • the refrigerant flowing in from the first refrigerant connection pipe (23a) passes through the interior of the heat source side heat exchanger (23) (specifically, the refrigerant chamber (S10)) in the vertical direction.
  • the heat source side heat exchanger (23) While flowing downward from the heat source, it absorbs heat from the water flowing through the inside of the heat source side heat exchanger (23) (specifically, the heat transfer pipe (72)) and evaporates, and then the second refrigerant connection pipe (23b) Spill from.
  • the refrigerant that has flowed out of the second refrigerant connection pipe (23b) of the heat source side heat exchanger (23) passes through the fourth check valve (38) and the four-way switching valve (22) in this order to the compressor (21). Inhaled.
  • the amount of decompression of the refrigerant in the expansion mechanism (24) is adjusted according to the degree of superheat of the refrigerant that has flowed out of the heat source side heat exchanger (23) in the heating operation, so that the heat source side heat exchanger ( In 23), the refrigerant can be reliably evaporated. Thereby, it is possible to prevent the occurrence of a phenomenon (so-called liquid back phenomenon) in which liquid refrigerant flows out of the heat source side heat exchanger (23) and is sucked into the compressor (21) in the heating operation.
  • a phenomenon so-called liquid back phenomenon
  • the decompression amount of the refrigerant in the expansion mechanism (24) is adjusted in accordance with the degree of superheat of the refrigerant that has flowed out of the use side heat exchanger (25) in the cooling operation, so that the use side heat exchanger ( In 25), the refrigerant can be reliably evaporated. Thereby, it is possible to prevent the occurrence of a phenomenon (so-called liquid back phenomenon) in which the liquid refrigerant flows out from the use side heat exchanger (25) and is sucked into the compressor (21) in the cooling operation.
  • a phenomenon so-called liquid back phenomenon
  • the heat source side heat exchanger (23) by a shell and tube type heat exchanger, the heat source side heat exchanger (23) can be easily disassembled. Thereby, maintenance and inspection of the heat source side heat exchanger (23) can be facilitated.
  • the air conditioner (10) shown in FIG. 5 is different from the air conditioner (10) shown in FIG. 1 in the configuration of the heat source side heat exchanger (23) and the heat source side circuit unit (30).
  • the other structure of the air conditioner (10) shown in FIG. 5 is the same as that of the air conditioner (10) shown in FIG.
  • the first refrigerant connection pipe (23a) of the heat source side heat exchanger (23) includes a condensation side refrigerant connection pipe (81) and a plurality (six in this example) of evaporation side refrigerant connection pipes ( 82).
  • the heat source side heat exchanger (23) is configured such that the refrigerant flowing from the condensation side refrigerant connection pipe (81) or the plurality of evaporation side refrigerant connection pipes (82) passes through the inside of the heat source side heat exchanger (23) from above. And flows out from the second refrigerant connecting pipe (23b).
  • the heat source side heat exchanger (23) is configured by a shell-and-tube heat exchanger (see FIG. 2).
  • the condensation side refrigerant connection pipe (81) and the plurality of evaporation side refrigerant connection pipes (82) are provided on the upper part of the shell (71) shown in FIG. 2 and communicate with the refrigerant chamber (S10).
  • the other configuration of the heat source side heat exchanger (23) may be the same as the configuration of the heat source side heat exchanger (23) shown in FIG.
  • heat is exchanged between the refrigerant flowing in the vertical direction in the refrigerant chamber (S10) and the refrigerant flowing in the plurality of heat transfer tubes (72).
  • the heat source side circuit unit (30) includes a flow divider (80) for diverting the refrigerant.
  • the flow divider (80) has one inflow port and a plurality of (in this example, six) outflow ports, and is configured to divert refrigerant flowing in from the inflow port and outflow from the plurality of outflow ports.
  • the refrigerant discharged from the compressor (21) in the cooling operation is supplied to the condensing side refrigerant connection pipe (81) of the heat source side heat exchanger (23), and is expanded in the heating operation.
  • the refrigerant that has flowed out of the mechanism (24) passes through the flow divider (80) and is supplied to the plurality of evaporation side refrigerant connection pipes (82) of the heat source side heat exchanger (23).
  • one end of the first connection pipe (31) of the heat source side circuit section (30) is connected to the condensation side refrigerant connection pipe (81) of the heat source side heat exchanger (23). The other end is connected to the third port of the four-way switching valve (22) via the third refrigerant pipe (P3).
  • One end of the second connection pipe (32) of the heat source side circuit section (30) is connected to the plurality of evaporation side refrigerant connection pipes (82) via the flow divider (80), and the other end is connected to the fifth refrigerant pipe ( It is connected to one end (connection point (Q3)) of the expansion mechanism (24) via P5).
  • one end of the second connection pipe (32) is connected to one inlet of the flow divider (80), and a plurality of outlets of the flow divider (80) are connected to a plurality of evaporation side refrigerant connection pipes (82), respectively.
  • the second check valve (36) is provided between the flow divider (80) and the fifth refrigerant pipe (P5) in the second connection pipe (32).
  • the other configuration of the heat source side circuit unit (30) is the same as the configuration of the heat source side circuit unit (30) shown in FIG.
  • the heat source side heat exchanger (23) is configured by a shell and tube type heat exchanger
  • the heat source side heat exchanger (23) is a shell and tube type heat exchanger.
  • it may be configured by a plate-type heat exchanger.
  • the refrigerant flowing in from the first refrigerant connection pipe (23a) flows from the upper side to the lower side of the heat source side heat exchanger (23) (first flow path) and flows downward from the second refrigerant connection pipe (23b).
  • the water flowing out from the first water connection pipe (23c) passes through the inside of the heat source side heat exchanger (23) (second flow path different from the first flow path) and passes through the second water connection pipe ( 23d), the refrigerant flowing vertically in the heat source side heat exchanger (23) (first flow path) and the water flowing in the heat source side heat exchanger (23) (second flow path)
  • the heat source side heat exchanger (23) can be configured to exchange heat.
  • the expansion mechanism (24) is constituted by the first and second expansion valves (41, 42) that are temperature-sensitive expansion valves (temperature automatic expansion valves) is taken as an example.
  • the expansion mechanism (24) may be configured by an electronic expansion valve (motor-operated valve) whose opening degree is adjusted by the control of the controller (60).
  • the expansion mechanism (24) in the cooling operation, the electronic expansion that configures the expansion mechanism (24) according to the degree of superheat of the refrigerant that has flowed out of the use side heat exchanger (25).
  • the opening degree of the valve is adjusted, and in the heating operation, the opening degree of the electronic expansion valve constituting the expansion mechanism (24) is adjusted according to the degree of superheat of the refrigerant flowing out from the heat source side heat exchanger (23).
  • the above-described air conditioner is useful as an air conditioner that performs air conditioning in a space to be air-conditioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

Un échangeur de chaleur côté source de chaleur (23) de la présente invention comporte un premier tuyau de raccordement de fluide de refroidissement (23a) et un second tuyau de raccordement de fluide de refroidissement (23b), et est configuré de telle sorte qu'un fluide de refroidissement qui s'écoule à partir du premier tuyau de raccordement de fluide de refroidissement (23a) s'écoule à travers l'intérieur de l'échangeur de chaleur côté source de chaleur (23) du côté supérieur vers le côté inférieur et sort du second tuyau de raccordement de fluide de refroidissement (23b). Le circuit de refroidissement (20) comporte une section de circuit côté source de chaleur (30) comprenant l'échangeur de chaleur côté source de chaleur (23). La section de circuit côté source de chaleur (30) est configurée de telle sorte que la direction d'écoulement du liquide de refroidissement passant à travers l'échangeur de chaleur côté source de chaleur (23) devient la direction du premier tuyau de raccordement de liquide de refroidissement (23a) vers le second tuyau de raccordement de liquide de refroidissement (23b) pendant une opération de refroidissement et une opération de chauffage.
PCT/JP2017/023230 2016-06-30 2017-06-23 Climatiseur WO2018003699A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201780040641.1A CN109416204A (zh) 2016-06-30 2017-06-23 空调机

Applications Claiming Priority (4)

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JP2016130535 2016-06-30
JP2016-130535 2016-06-30
JP2017-113378 2017-06-08
JP2017113378A JP6341321B2 (ja) 2016-06-30 2017-06-08 空気調和機

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5974447A (ja) * 1982-10-22 1984-04-26 Mitsubishi Heavy Ind Ltd 空気調和機
JPH09229506A (ja) * 1996-02-20 1997-09-05 Daikin Ind Ltd ヒートポンプシステム
JP2012136152A (ja) * 2010-12-27 2012-07-19 Daikin Industries Ltd 船舶用空調装置
US20150159922A1 (en) * 2013-12-09 2015-06-11 Jinsung Kim Heat pump system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5974447A (ja) * 1982-10-22 1984-04-26 Mitsubishi Heavy Ind Ltd 空気調和機
JPH09229506A (ja) * 1996-02-20 1997-09-05 Daikin Ind Ltd ヒートポンプシステム
JP2012136152A (ja) * 2010-12-27 2012-07-19 Daikin Industries Ltd 船舶用空調装置
US20150159922A1 (en) * 2013-12-09 2015-06-11 Jinsung Kim Heat pump system

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