US20100175409A1 - Air conditioning apparatus - Google Patents
Air conditioning apparatus Download PDFInfo
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- US20100175409A1 US20100175409A1 US12/376,751 US37675107A US2010175409A1 US 20100175409 A1 US20100175409 A1 US 20100175409A1 US 37675107 A US37675107 A US 37675107A US 2010175409 A1 US2010175409 A1 US 2010175409A1
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- Prior art keywords
- muffler
- pressure pulsation
- air conditioning
- conditioning apparatus
- reducing component
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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
- F25B41/00—Fluid-circulation 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line 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
- F25B2500/00—Problems to be solved
- F25B2500/13—Vibrations
Definitions
- the present invention relates to an air conditioning apparatus provided with a refrigerant circuit that includes a compressor.
- Patent Document 1 An air conditioning apparatus has therefore been disclosed in Patent Document 1, in which a single muffler is provided between the compressor and a four-way switch valve in order to suppress the propagation of pressure pulsation to the indoor refrigerant pipe.
- Patent Document 1 Japanese Laid-open Patent Publication No. 9-250831
- the pressure pulsation can be reduced by the muffler when the pulsation generated by the compressor is directed toward the indoor units via the four-way switch valve (i.e., in the ease of suction pulsation during heating, and exhaust pulsation during cooling).
- An object of the present invention is to provide an air conditioning apparatus wherein the pressure pulsation generated by the compressor can be entirely reduced during cooling as well as during heating and it is capable of muffler sharing.
- An air conditioning apparatus is an air conditioning apparatus comprising a refrigerant circuit.
- the refrigerant circuit is configured so that a compressor for compressing a refrigerant, an indoor heat exchanger, an outdoor heat exchanger, and a four-way switch valve are connected via a refrigerant pipe.
- the four-way switch valve switches the flow of refrigerant compressed by the compressor to either the indoor heat exchanger ox the outdoor heat exchanger.
- the air conditioning apparatus further comprises a pressure pulsation reducing component.
- the pressure pulsation reducing component is provided between the four-way switch valve and the indoor heat exchanger.
- the pressure pulsation reducing component reduces pressure pulsation inside the refrigerant circuit.
- the pressure pulsation is generated by the compressor.
- the pressure pulsation reducing component is provided, between the four-way switch valve and the indoor heat exchanger, the pressure pulsation generated by the compressor can be entirely reduced before reaching the indoor refrigerant pipe both during cooling and during heating in the case of an air conditioning apparatus that switches between cooling and heating. Further, a muffler used tor reducing pressure pulsations can be shared, and the number of components can be reduced.
- An air conditioning apparatus is the air conditioning apparatus of the first aspect, wherein the pressure pulsation reducing component is provided within an outdoor unit.
- the compressor and the outdoor heat exchanger are housed in the outdoor unit.
- the pressure pulsation reducing component is provided within the outdoor unit in which the compressor and the outdoor heat exchanger are housed, the pressure pulsation reducing component is easily installed and maintained. Moreover, since the pressure pulsation reducing component is installed at the position near the compressor, which is the source of the pressure pulsation, within the refrigerant circuit, the pressure pulsation reducing effects thereof are significant.
- An air conditioning apparatus is the air conditioning apparatus of the first or second aspect, wherein the refrigerant is CO 2 .
- CO 2 is used as the refrigerant, and pressure pulsations are more significant compared with other refrigerants, but pulsations can be reduced both during cooling and during heating by the pressure pulsation reducing component provided between the four-way switch valve and the indoor heat exchanger.
- a CO 2 refrigerant has low global warming potential and enables products that are environmentally friendly.
- the CO 2 refrigerant also has high refrigeration capacity per unit volume, and a cylinder tor achieving the same capacity as other refrigerants can be reduced in size, and the compressor can also be reduced in size.
- An air conditioning apparatus is the air conditioning apparatus of any of the first through third aspects, wherein the pressure pulsation reducing component is a vessel having a muffler function.
- the pressure pulsation reducing component is a vessel having a muffler function, not only can pressure pulsations be reduced, but liquid-vapor separation of the refrigerant is also possible inside the vessel.
- An air conditioning apparatus is the air conditioning apparatus of any of the first through fourth aspects, wherein the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a ⁇ -type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
- the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a ⁇ -type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
- the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a ⁇ -type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler, pressure pulsation can be effectively reduced using these conventionally known mufflers.
- the pressure pulsation generated by the compressor can be entirely reduced before reaching the indoor refrigerant pipe both during cooling and during heating.
- a muffler used for reducing pressure pulsations can also be shared, and the number of components can be reduced.
- the pressure pulsation reducing component is easily installed and maintained, and the pressure pulsation reducing effects of the pressure pulsation reducing component are significant.
- pulsations can be reduced both during cooling and during heating by the pressure pulsation reducing component provided between the four-way switch valve and the Indoor heat exchanger.
- a CO 2 refrigerant has low global warming potential and enables products that are environmentally friendly.
- a CO 2 refrigerant also has high refrigeration capacity per unit volume, and a cylinder for achieving the same capacity as other refrigerants can be reduced in size, and the compressor can also be reduced in size.
- pressure pulsation can be effectively reduced using a conventionally known muffler.
- FIG. 1 is a schematic diagram showing an air conditioning apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing an expansion muffler as a specific example of a pressure pulsation reducing component of FIG. 1 .
- FIG. 3 is a schematic diagram showing a ⁇ -type filter as a specific example of the pressure pulsation reducing component of FIG. 1 .
- FIG. 4 is a schematic diagram showing a side branch muffler as a specific example of the pressure pulsation reducing component of FIG. 1 .
- FIG. 5 is a schematic diagram showing a Helmholtz muffler as a specific example of the pressure pulsation reducing component of FIG. 1 .
- FIG 6 is a schematic diagram showing an interference muffler as a specific example of the pressure pulsation reducing component of FIG 1 .
- An air conditioning apparatus 1 shown in FIG. 1 is capable of both a cooling operation and a heating operation, and is provided with a refrigerant circuit 7 configured so that a compressor 2 for compressing a CO 2 refrigerant; an indoor heat exchanger 3 ; an outdoor heat exchanger 4 ; a four-way switch valve 5 for switching the flow of refrigerant compressed by the compressor 2 to either the indoor heat exchanger 3 or outdoor heat exchanger 4 ; and an electromagnetic expansion valve 10 are connected via a refrigerant pipe 6 .
- the air conditioning apparatus 1 is further provided with a pressure pulsation reducing component 8 for reducing pressure pulsation that is generated by the compressor 2 within the refrigerant circuit 7 .
- the pressure pulsation reducing component 8 is provided between the four-way switch valve 5 arid the indoor heal exchanger 3 . Therefore, the pressure pulsation generated by the compressor can be entirely reduced both during cooling and during healing in the case of the air conditioning apparatus 1 that switches between cooling and heating.
- the muffler used for reducing pressure pulsations can also be shared, and the number of components can be reduced.
- the pressure pulsation reducing component 8 is provided within an outdoor unit 9 in which the compressor 2 and outdoor heat exchanger 4 are housed.
- CO 2 is used as the refrigerant.
- the pressure pulsations of a CO 2 refrigerant are more significant than the pressure pulsations of other refrigerants, but pulsations can be reduced both during cooling and during heating by the pressure pulsation reducing component 8 provided between the four-way switch valve 5 and the indoor heat exchanger 3 .
- the pressure pulsation reducing component 8 is specifically one component selected from the group consisting of an expansion muffler, a ⁇ -type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
- an expansion muffler 21 has an expansion portion 21 a and straight pipe portions 21 b connected on both sides thereof.
- the cross-sectional area S 2 of the expansion portion 21 a is larger than the cross-sectional area S 1 of the straight pipe portions 21 b.
- the value of the transmission loss TL of the expansion muffler 21 is indicated by the equation below.
- L 1 is the length of the expansion portion 21 a
- m S 2 /S 1
- k 2 ⁇ f/c, wherein c is the speed of sound.
- a ⁇ -type filter 22 has a first expansion portion 22 a, a second expansion portion 22 b, a connecting pipe portion 22 c, a first straight pipe portion 22 d, and a second straight pipe portion 22 e.
- the connecting pipe portion 22 c connects the first expansion portion 22 a and the second expansion portion 22 b.
- the first straight pipe -portion 22 d is connected on the opposite side from the connecting pipe portion 22 c in the first expansion portion 22 a.
- the second straight pipe portion 22 e is connected on the opposite side from the connecting pipe portion 22 c in the second expansion portion 22 b.
- Each of the cross-sectional areas of the first expansion portion 22 a and the second expansion portion 22 b are larger than cross-sectional areas S 3 , S 4 of the connecting pipe portion 22 c, and the first straight pipe portion 22 d and second-straight pipe portion 22 e, respectively.
- the value of the transmission loss TL of the ⁇ -type filter 22 is as shown below. (Note that L 2 is the length of the connecting pipe portion 22 c, V 1 is the volume of the first expansion portion 22 a, V 2 is the volume of the second expansion portion 22 b, S 3 is the cross-sectional area of each of the first straight pipe portion 22 d and the second straight pipe portion 22 e, and S 4 is the cross-sectional area of the connecting pipe portion 22 c. )
- a side branch muffler 23 has a branch, portion 23 a and a straight pipe portion 23 b.
- the brunch portion 23 a branches at a right angle from the straight pipe portion 23 b.
- the frequency f of the side branch muffler 23 is as shown below.
- L 3 is die length of the branch portion 23 a
- c is die speed of sound.
- a Helmholtz muffler 24 has an expansion portion 24 a, a connecting pipe portion 24 b, and a straight pipe portion 24 c.
- the connecting pipe portion 24 b branches at a right angle from the straight pipe portion 24 c.
- the connecting pipe portion 24 b connects the expansion portion 24 a and the straight pipe portion 24 c.
- the cross-sectional area of the expansion portion 24 a is larger than the cross-sectional area of each of the connecting pipe portion 24 b and the straight pipe portion 24 c.
- the frequency f of the Helmholtz muffler 24 is as shown below.
- V 3 is the volume of the expansion portion 24 a
- S 5 is the cross-sectional area of the connecting pipe portion 24 b
- L 4 is the length of the connecting pipe portion 24 b
- c is the speed of sound.
- an interference muffler 25 has a curved pipe portion 25 a that extends in an arch, and a straight pipe portion 25 b. Both ends of the curved pipe portion 25 a are connected to the straight pipe portion 25 b.
- the half wavelength ⁇ /2 of the interference muffler 25 is in the relationship as shown below:
- L 5 is the pipe length of the curved pipe portion 25 a
- L 6 is the pipe length of the straight pipe portion 25 b.
- the pressure pulsation reducing component 8 is provided between the four-way switch valve 5 and the indoor heat exchanger 3 , the pressure pulsation generated by the compressor 2 can be entirely reduced before reaching the indoor refrigerant pipe both during cooling and during heating in the case of the air conditioning apparatus 1 that switches between cooling, and heating.
- the muffler used for reducing pressure pulsations can also be shared, thereby the number of components can be reduced.
- the length of the refrigerant pipe is relatively small, and the indoor refrigerant pipe tends to vibrate and readily generate noise, but pressure pulsation can be effectively reduced in the air conditioning apparatus 1 of the present embodiment in such a case.
- the pressure pulsation reducing component 8 is provided within an outdoor unit 9 in which the compressor 2 and the outdoor heat exchanger 4 are housed, the pressure pulsation reducing component 8 is easily installed and maintained. Further, since the pressure pulsation reducing component 8 is installed at a position near the compressor 2 , which is the source of the pressure pulsation, within the refrigerant circuit 7 , the pressure pulsation reducing effects thereof are significant.
- CO 2 is used as the refrigerant, and although pressure pulsations are more significant compared with other refrigerants, pulsations can be reduced both during cooling and during heating by the pressure pulsation reducing component 8 provided between the four-way switch valve 5 and the indoor heat exchanger 3 .
- a CO 2 refrigerant has low global warming potential and enables products that are environmentally friendly.
- a CO 2 refrigerant also has high refrigeration capacity per unit volume, and a cylinder for achieving the same capacity as other refrigerants can be reduced in size, and the compressor can also be reduced in size.
- the pressure pulsation reducing component 8 is one component selected from the group that consists of an expansion muffler, a ⁇ -type filter, a side-branch muffler, a Helmholtz muffler, and an interference muffler; and pressure pulsation can therefore be effectively reduced using these conventionally known mufflers.
- the pressure pulsation reducing component 8 may also be a component that has a function in addition to a muffler function.
- the pressure pulsation reducing component 8 may be a vessel having a muffler function. In this case, not only can pressure pulsations be reduced, but liquid-vapor separation of the refrigerant is also possible inside the vessel.
- the vessel having a muffler function may also be one component selected from the above-described group that consists of an expansion muffler, a ⁇ -type filter, a side-branch muffler, a Helmholtz muffler, and an interference muffler.
- the present invention can be widely used in air conditioning apparatus provided with a refrigerant circuit that includes a compressor.
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Abstract
An air conditioning apparatus is provided whereby the pressure pulsation generated by a compressor can be entirely reduced both during cooling and during heating, and a muffler can be shared. The air conditioning apparatus has a refrigerant circuit. The refrigerant circuit is configured so that a compressor for compressing a refrigerant, an indoor heat exchanger, an outdoor heat exchanger, and a four-way switch valve are connected via a refrigerant pipe. The four-way switch valve switches the flow of refrigerant compressed by the compressor to either the indoor heat exchanger or the outdoor heat exchanger. The air conditioning apparatus further includes a pressure pulsation reducing component. The pressure pulsation reducing component is provided between the four-way switch valve and the indoor heat exchanger. The pressure pulsation reducing component reduces pressure pulsation inside the refrigerant circuit. The pressure pulsation is generated by the compressor.
Description
- The present invention relates to an air conditioning apparatus provided with a refrigerant circuit that includes a compressor.
- Conventional refrigerant circuits have problems in that pressure pulsation generated by a compressor is propagated through a refrigerant pipe into an indoor refrigerant pipe near the indoor units, and vibration and/or abnormal noise is generated from the indoor refrigerant pipe arid the indoor units. An air conditioning apparatus has therefore been disclosed in
Patent Document 1, in which a single muffler is provided between the compressor and a four-way switch valve in order to suppress the propagation of pressure pulsation to the indoor refrigerant pipe. - <
Patent Document 1> Japanese Laid-open Patent Publication No. 9-250831 - In the case of the air conditioning apparatus disclosed in
Patent Document 1, the pressure pulsation can be reduced by the muffler when the pulsation generated by the compressor is directed toward the indoor units via the four-way switch valve (i.e., in the ease of suction pulsation during heating, and exhaust pulsation during cooling). However, when the pulsation generated by the compressor is directed toward the indoor units and not through the four-way switch valve (i.e., in the case of exhaust pulsation during heating, and suction pulsation during cooling), the pressure pulsations do not pass through the muffler, and it is therefore impossible both during cooling and heating to entirely reduce the pressure pulsation generated by the compressor through the use of the muffler before the pressure pulsation reaches the indoor refrigerant pipe near the indoor units. - Further, providing a muffler to both the suction side and the exhaust side of the compressor has a problem in that it increases the number of components and the manufacturing cost.
- An object of the present invention is to provide an air conditioning apparatus wherein the pressure pulsation generated by the compressor can be entirely reduced during cooling as well as during heating and it is capable of muffler sharing.
- An air conditioning apparatus according to a first aspect of the present invention is an air conditioning apparatus comprising a refrigerant circuit. The refrigerant circuit is configured so that a compressor for compressing a refrigerant, an indoor heat exchanger, an outdoor heat exchanger, and a four-way switch valve are connected via a refrigerant pipe. The four-way switch valve switches the flow of refrigerant compressed by the compressor to either the indoor heat exchanger ox the outdoor heat exchanger. The air conditioning apparatus further comprises a pressure pulsation reducing component. The pressure pulsation reducing component is provided between the four-way switch valve and the indoor heat exchanger. The pressure pulsation reducing component reduces pressure pulsation inside the refrigerant circuit. The pressure pulsation is generated by the compressor.
- In this configuration, since the pressure pulsation reducing component is provided, between the four-way switch valve and the indoor heat exchanger, the pressure pulsation generated by the compressor can be entirely reduced before reaching the indoor refrigerant pipe both during cooling and during heating in the case of an air conditioning apparatus that switches between cooling and heating. Further, a muffler used tor reducing pressure pulsations can be shared, and the number of components can be reduced.
- An air conditioning apparatus according to a second aspect of the present invention is the air conditioning apparatus of the first aspect, wherein the pressure pulsation reducing component is provided within an outdoor unit. The compressor and the outdoor heat exchanger are housed in the outdoor unit.
- Since the pressure pulsation reducing component is provided within the outdoor unit in which the compressor and the outdoor heat exchanger are housed, the pressure pulsation reducing component is easily installed and maintained. Moreover, since the pressure pulsation reducing component is installed at the position near the compressor, which is the source of the pressure pulsation, within the refrigerant circuit, the pressure pulsation reducing effects thereof are significant.
- An air conditioning apparatus according to a third aspect of the present invention is the air conditioning apparatus of the first or second aspect, wherein the refrigerant is CO2.
- In this configuration, CO2 is used as the refrigerant, and pressure pulsations are more significant compared with other refrigerants, but pulsations can be reduced both during cooling and during heating by the pressure pulsation reducing component provided between the four-way switch valve and the indoor heat exchanger. A CO2 refrigerant has low global warming potential and enables products that are environmentally friendly. The CO2 refrigerant also has high refrigeration capacity per unit volume, and a cylinder tor achieving the same capacity as other refrigerants can be reduced in size, and the compressor can also be reduced in size.
- An air conditioning apparatus according to a fourth aspect of the present invention is the air conditioning apparatus of any of the first through third aspects, wherein the pressure pulsation reducing component is a vessel having a muffler function.
- In this configuration, since the pressure pulsation reducing component is a vessel having a muffler function, not only can pressure pulsations be reduced, but liquid-vapor separation of the refrigerant is also possible inside the vessel.
- An air conditioning apparatus according to a fifth aspect of the present invention is the air conditioning apparatus of any of the first through fourth aspects, wherein the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
- In this configuration, because the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler, pressure pulsation can be effectively reduced using these conventionally known mufflers.
- According to the first aspect, the pressure pulsation generated by the compressor can be entirely reduced before reaching the indoor refrigerant pipe both during cooling and during heating. A muffler used for reducing pressure pulsations can also be shared, and the number of components can be reduced.
- According to the second aspect, the pressure pulsation reducing component is easily installed and maintained, and the pressure pulsation reducing effects of the pressure pulsation reducing component are significant.
- According to the third aspect, although pressure pulsations are more significant compared with other refrigerants, pulsations can be reduced both during cooling and during heating by the pressure pulsation reducing component provided between the four-way switch valve and the Indoor heat exchanger. A CO2 refrigerant has low global warming potential and enables products that are environmentally friendly. A CO2 refrigerant also has high refrigeration capacity per unit volume, and a cylinder for achieving the same capacity as other refrigerants can be reduced in size, and the compressor can also be reduced in size.
- According to the fourth aspect, not only can pressure pulsations be reduced, but liquid-vapor separation of the refrigerant is also possible inside the vessel.
- According to the fifth aspect, pressure pulsation can be effectively reduced using a conventionally known muffler.
-
FIG. 1 is a schematic diagram showing an air conditioning apparatus according to an embodiment of the present invention. -
FIG. 2 is a schematic diagram showing an expansion muffler as a specific example of a pressure pulsation reducing component ofFIG. 1 . -
FIG. 3 is a schematic diagram showing a π-type filter as a specific example of the pressure pulsation reducing component ofFIG. 1 . -
FIG. 4 is a schematic diagram showing a side branch muffler as a specific example of the pressure pulsation reducing component ofFIG. 1 . -
FIG. 5 is a schematic diagram showing a Helmholtz muffler as a specific example of the pressure pulsation reducing component ofFIG. 1 . - FIG 6 is a schematic diagram showing an interference muffler as a specific example of the pressure pulsation reducing component of FIG 1.
- 1 air conditioning apparatus
2 compressor
3 indoor heat exchanger
4 outdoor heat exchanger
5 four-way switch valve
6 refrigerant pipe
7 refrigerant circuit
8 pressure pulsation reducing component
9 outdoor unit - An
air conditioning apparatus 1 shown inFIG. 1 is capable of both a cooling operation and a heating operation, and is provided with a refrigerant circuit 7 configured so that acompressor 2 for compressing a CO2 refrigerant; anindoor heat exchanger 3; an outdoor heat exchanger 4; a four-way switch valve 5 for switching the flow of refrigerant compressed by thecompressor 2 to either theindoor heat exchanger 3 or outdoor heat exchanger 4; and anelectromagnetic expansion valve 10 are connected via a refrigerant pipe 6. Theair conditioning apparatus 1 is further provided with a pressurepulsation reducing component 8 for reducing pressure pulsation that is generated by thecompressor 2 within the refrigerant circuit 7. - The pressure
pulsation reducing component 8 is provided between the four-way switch valve 5 arid theindoor heal exchanger 3. Therefore, the pressure pulsation generated by the compressor can be entirely reduced both during cooling and during healing in the case of theair conditioning apparatus 1 that switches between cooling and heating. The muffler used for reducing pressure pulsations can also be shared, and the number of components can be reduced. - The pressure pulsation reducing
component 8 is provided within an outdoor unit 9 in which thecompressor 2 and outdoor heat exchanger 4 are housed. - In the
air conditioning apparatus 1, CO2 is used as the refrigerant. The pressure pulsations of a CO2 refrigerant are more significant than the pressure pulsations of other refrigerants, but pulsations can be reduced both during cooling and during heating by the pressurepulsation reducing component 8 provided between the four-way switch valve 5 and theindoor heat exchanger 3. - The pressure pulsation reducing
component 8 is specifically one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler. - As shown in
FIG. 2 , anexpansion muffler 21 has an expansion portion 21 a andstraight pipe portions 21 b connected on both sides thereof. The cross-sectional area S2 of the expansion portion 21 a is larger than the cross-sectional area S1 of thestraight pipe portions 21 b. - The value of the transmission loss TL of the
expansion muffler 21 is indicated by the equation below. -
TL=10×log(1+¼×(m−1/m)2×sin2(K×L1)) (Eq.1) - In the equation, L1 is the length of the expansion portion 21 a, m=S2/S1, and k=2πf/c, wherein c is the speed of sound.
- As shown in
FIG. 3 , a π-type filter 22 has afirst expansion portion 22 a, asecond expansion portion 22 b, a connectingpipe portion 22 c, a firststraight pipe portion 22 d, and a secondstraight pipe portion 22 e. The connectingpipe portion 22 c connects thefirst expansion portion 22 a and thesecond expansion portion 22 b. The first straight pipe -portion 22 d is connected on the opposite side from the connectingpipe portion 22 c in thefirst expansion portion 22 a. The secondstraight pipe portion 22 e is connected on the opposite side from the connectingpipe portion 22 c in thesecond expansion portion 22 b. Each of the cross-sectional areas of thefirst expansion portion 22 a and thesecond expansion portion 22 b are larger than cross-sectional areas S3, S4 of the connectingpipe portion 22 c, and the firststraight pipe portion 22 d and second-straight pipe portion 22 e, respectively. - The value of the transmission loss TL of the π-
type filter 22 is as shown below. (Note that L2 is the length of the connectingpipe portion 22 c, V1 is the volume of thefirst expansion portion 22 a, V2 is the volume of thesecond expansion portion 22 b, S3 is the cross-sectional area of each of the firststraight pipe portion 22 d and the secondstraight pipe portion 22 e, and S4 is the cross-sectional area of the connectingpipe portion 22 c.) -
TL=10×log(σ2) (Eq. 2) - In the equation, σ=V2×ω3×L2/(S3×S4×c3), wherein c is the speed of sound.
- As shown in
FIG. 4 , aside branch muffler 23 has a branch,portion 23 a and astraight pipe portion 23 b. Thebrunch portion 23 a branches at a right angle from thestraight pipe portion 23 b. - The frequency f of the
side branch muffler 23 is as shown below. -
f=c/(4×L3) (Eq. 3) - In the equation, L3 is die length of the
branch portion 23 a, and c is die speed of sound. - As shown in
FIG. 5 , aHelmholtz muffler 24 has anexpansion portion 24 a, a connectingpipe portion 24 b, and astraight pipe portion 24 c. The connectingpipe portion 24 b branches at a right angle from thestraight pipe portion 24 c. The connectingpipe portion 24 b connects theexpansion portion 24 a and thestraight pipe portion 24 c. The cross-sectional area of theexpansion portion 24 a is larger than the cross-sectional area of each of the connectingpipe portion 24 b and thestraight pipe portion 24 c. - The frequency f of the
Helmholtz muffler 24 is as shown below. -
F=c/2π×√(S5/(V3×L4)) (Eq. 4) - In the equation, V3 is the volume of the
expansion portion 24 a, S5 is the cross-sectional area of the connectingpipe portion 24 b, L4 is the length of the connectingpipe portion 24 b, and c is the speed of sound. - As shown in
FIG. 6 , aninterference muffler 25 has acurved pipe portion 25 a that extends in an arch, and astraight pipe portion 25 b. Both ends of thecurved pipe portion 25 a are connected to thestraight pipe portion 25 b. - The half wavelength λ/2 of the
interference muffler 25 is in the relationship as shown below: -
λ/2=L5−L6 (Eq. 5) - In the equation, L5 is the pipe length of the
curved pipe portion 25 a, and L6 is the pipe length of thestraight pipe portion 25 b. - <Characteristics>
- (1) In the
air conditioning apparatus 1 according to the embodiment, since the pressurepulsation reducing component 8 is provided between the four-way switch valve 5 and theindoor heat exchanger 3, the pressure pulsation generated by thecompressor 2 can be entirely reduced before reaching the indoor refrigerant pipe both during cooling and during heating in the case of theair conditioning apparatus 1 that switches between cooling, and heating. The muffler used for reducing pressure pulsations can also be shared, thereby the number of components can be reduced. - Particularly in a ceiling-mounted indoor unit or room air conditioner, the length of the refrigerant pipe is relatively small, and the indoor refrigerant pipe tends to vibrate and readily generate noise, but pressure pulsation can be effectively reduced in the
air conditioning apparatus 1 of the present embodiment in such a case. - (2) In the
air conditioning apparatus 1 of the present embodiment, since the pressurepulsation reducing component 8 is provided within an outdoor unit 9 in which thecompressor 2 and the outdoor heat exchanger 4 are housed, the pressurepulsation reducing component 8 is easily installed and maintained. Further, since the pressurepulsation reducing component 8 is installed at a position near thecompressor 2, which is the source of the pressure pulsation, within the refrigerant circuit 7, the pressure pulsation reducing effects thereof are significant. - (3) In the
air conditioning apparatus 1 of the present invention, CO2 is used as the refrigerant, and although pressure pulsations are more significant compared with other refrigerants, pulsations can be reduced both during cooling and during heating by the pressurepulsation reducing component 8 provided between the four-way switch valve 5 and theindoor heat exchanger 3. A CO2 refrigerant has low global warming potential and enables products that are environmentally friendly. A CO2 refrigerant also has high refrigeration capacity per unit volume, and a cylinder for achieving the same capacity as other refrigerants can be reduced in size, and the compressor can also be reduced in size. - (4) In the
air conditioning apparatus 1 of the present embodiment, the pressurepulsation reducing component 8 is one component selected from the group that consists of an expansion muffler, a π-type filter, a side-branch muffler, a Helmholtz muffler, and an interference muffler; and pressure pulsation can therefore be effectively reduced using these conventionally known mufflers. - <Modification>
- The pressure pulsation reducing
component 8 may also be a component that has a function in addition to a muffler function. For example, the pressurepulsation reducing component 8 may be a vessel having a muffler function. In this case, not only can pressure pulsations be reduced, but liquid-vapor separation of the refrigerant is also possible inside the vessel. - The vessel having a muffler function may also be one component selected from the above-described group that consists of an expansion muffler, a π-type filter, a side-branch muffler, a Helmholtz muffler, and an interference muffler.
- The present invention can be widely used in air conditioning apparatus provided with a refrigerant circuit that includes a compressor.
Claims (15)
1. An air conditioning apparatus, comprising:
a refrigerant circuit having
a compressor being configured to compress a refrigerant,
an indoor heat exchanger,
an outdoor heat exchanger, and
a four-way switch valve being configured to switch the flow of refrigerant compressed by the compressor to either the indoor heat exchanger or the outdoor heal exchanger,
the compressor, the indoor heat exchanger, the outdoor heat exchanger, and the four-way switch valve being connected via a refrigerant pipe; and
a pressure pulsation reducing component being provided between the four-way switch valve and the indoor heat exchanger and configured to reduce pressure pulsation inside the refrigerant circuit generated by the compressor.
2. The air conditioning apparatus according to claim 1 , wherein
the pressure pulsation reducing component is provided within an outdoor unit configured to house the compressor and the outdoor heat exchanger therein.
3. The air conditioning apparatus according to claim 2 , wherein the refrigerant is CO2.
4. The air conditioning apparatus according to claim 3 , wherein
the pressure pulsation reducing component is a vessel having a muffler function.
5. The air conditioning apparatus according to claim 4 , wherein
the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
6. The air conditioning apparatus according to claim 3 , wherein
the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
7. The air conditioning apparatus according to claim 2 , wherein
the pressure pulsation reducing component is a vessel having a muffler function.
8. The air conditioning apparatus according to claim 7 , wherein
the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
10. The air conditioning apparatus according to claim 1 , wherein the refrigerant is CO2.
11. The air conditioning apparatus according to claim 10 , wherein
the pressure pulsation reducing component is a vessel having a muffler function.
12. The air conditioning apparatus according to claim 11 , wherein
the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
13. The air conditioning apparatus according to claim 10 , wherein
the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
14. The air conditioning apparatus according to claim 1 , wherein
the pressure pulsation reducing component is a vessel having a muffler function.
15. The air conditioning apparatus according to claim 14 , wherein
the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
16. The air conditioning apparatus according to claim 1 , wherein
the pressure pulsation reducing component is one component selected from the group consisting of an expansion muffler, a π-type filter, a side branch muffler, a Helmholtz muffler, and an interference muffler.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006219596A JP2008045778A (en) | 2006-08-11 | 2006-08-11 | Air conditioner |
JP2006-219596 | 2006-08-11 | ||
PCT/JP2007/065492 WO2008018489A1 (en) | 2006-08-11 | 2007-08-08 | Air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100175409A1 true US20100175409A1 (en) | 2010-07-15 |
Family
ID=39033018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/376,751 Abandoned US20100175409A1 (en) | 2006-08-11 | 2007-08-08 | Air conditioning apparatus |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100175409A1 (en) |
EP (1) | EP2058609A1 (en) |
JP (1) | JP2008045778A (en) |
KR (1) | KR20090034944A (en) |
CN (1) | CN101501420B (en) |
AU (1) | AU2007282504B2 (en) |
WO (1) | WO2008018489A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160312773A1 (en) * | 2015-04-22 | 2016-10-27 | Trane International Inc. | Refrigerant Line Muffler |
US11073145B2 (en) | 2018-01-31 | 2021-07-27 | Trane International Inc. | Pressure pulsation traps |
US11536499B2 (en) | 2017-11-08 | 2022-12-27 | Mitsubishi Heavy Industries Thermal Systems, Ltd. | Refrigeration machine |
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US20110000243A1 (en) * | 2008-03-06 | 2011-01-06 | Carrier Corporation | Split discharge line with integrated muffler for a compressor |
JP2009281620A (en) * | 2008-05-20 | 2009-12-03 | Sanden Corp | Refrigerating circuit |
KR101461623B1 (en) * | 2013-08-12 | 2014-11-20 | (주)한엑스 | A refrigerating cycle device with a pulsation damper |
WO2015029206A1 (en) * | 2013-08-30 | 2015-03-05 | 三菱電機株式会社 | Refrigeration cycle apparatus |
CZ308291B6 (en) * | 2014-04-10 | 2020-04-22 | Hanon Systems | Damping device and producing it |
CN106795981A (en) * | 2014-10-08 | 2017-05-31 | 三菱电机株式会社 | Expansion valve and the refrigerating circulatory device using expansion valve |
CN105605821A (en) * | 2016-01-25 | 2016-05-25 | 铁道第三勘察设计院集团有限公司 | Carbon dioxide direct extension air conditioning device |
JP2018119776A (en) * | 2017-01-27 | 2018-08-02 | 三菱重工サーマルシステムズ株式会社 | Refrigeration machine |
JP2019095118A (en) * | 2017-11-21 | 2019-06-20 | 三菱重工サーマルシステムズ株式会社 | Refrigeration machine |
EP3828413B1 (en) | 2019-11-28 | 2023-03-22 | Daikin Europe N.V. | Heat pump comprising a muffler |
EP3828482A1 (en) | 2019-11-28 | 2021-06-02 | Daikin Europe N.V. | Heat pump with a muffler |
CN110940136B (en) * | 2019-12-10 | 2020-11-24 | 珠海格力电器股份有限公司 | Refrigerator refrigerating system and defrosting control method thereof |
DE102020100445A1 (en) * | 2020-01-10 | 2021-07-15 | Viessmann Werke Gmbh & Co Kg | Thermal device |
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- 2007-08-08 CN CN2007800297783A patent/CN101501420B/en active Active
- 2007-08-08 KR KR1020097002073A patent/KR20090034944A/en not_active Application Discontinuation
- 2007-08-08 US US12/376,751 patent/US20100175409A1/en not_active Abandoned
- 2007-08-08 AU AU2007282504A patent/AU2007282504B2/en active Active
- 2007-08-08 EP EP07792160A patent/EP2058609A1/en not_active Withdrawn
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US5596879A (en) * | 1994-10-04 | 1997-01-28 | Carrier Corporation | Method for determining optimum placement of refrigerant line muffler |
US6148631A (en) * | 1998-05-14 | 2000-11-21 | Matsushita Electric Industrial Co., Ltd. | Silencer and air conditioner |
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Also Published As
Publication number | Publication date |
---|---|
EP2058609A1 (en) | 2009-05-13 |
KR20090034944A (en) | 2009-04-08 |
WO2008018489A1 (en) | 2008-02-14 |
AU2007282504A1 (en) | 2008-02-14 |
CN101501420A (en) | 2009-08-05 |
JP2008045778A (en) | 2008-02-28 |
AU2007282504B2 (en) | 2010-08-05 |
CN101501420B (en) | 2011-03-16 |
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