JP2007127388A - Integrated air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an integrated air conditioner capable of preventing a leaked refrigerant from being carried to an indoor space when leakage of the refrigerant has occurred at a welding connection part of a refrigeration cycle. <P>SOLUTION: This integrated air conditioner is provided with one housing, and is structured such that the refrigeration cycle is incorporated in the housing; and a piping connection part of the refrigeration cycle is arranged in a space part isolated from an indoor draft duct in order to prevent the piping connection part of the refrigeration cycle from existing in the indoor draft duct for circulating conditioned air therethrough. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an integrated air conditioner, and more particularly to an integrated air conditioner structured to prevent refrigerant leakage into a room.

  A conventional integrated air conditioner in which an indoor unit and an outdoor unit are integrated is configured such that an indoor heat exchanger and an indoor blower are arranged in an indoor ventilation path provided between a room and a housing that houses components. The air is heated or cooled and circulated.

  In general, an indoor heat exchanger uses a finned heat exchanger composed of a heat transfer tube group bent into a U-shape, a fin group, and a retanbend that connects the heat transfer tube group.

  However, a pipe connection portion such as a conventional weld connection portion of a retin bend is a portion where the refrigerant easily leaks due to poor welding, repeated load, or aging deterioration.

  Therefore, when a pipe connection portion such as a weld joint between the retanbend and the heat transfer tube is arranged in the indoor ventilation path, when the refrigerant leaks at the joint, the leaked refrigerant is carried into the indoor space by the indoor blower.

When the HFC refrigerant or the refrigerant mainly composed of CO ₂ or CO ₂ fills the room, the user in the room may cause a serious obstacle such as lack of oxygen. In addition, when the indoor space is filled with the combustible refrigerant and the refrigerant mainly composed of the combustible refrigerant, the leaked refrigerant may ignite and explode when an ignition source exists in the indoor space.

In addition, the air conditioner of patent document 1 is proposed as an integrated air conditioner.
JP 2003-214648 A

  The present invention has been made in consideration of the above-mentioned circumstances, and when the refrigerant leaks at the weld connection portion of the indoor heat exchanger, the integrated air can prevent the leaked refrigerant from being conveyed to the indoor space. The purpose is to provide a harmony machine.

  In order to achieve the above-described object, an integrated air conditioner according to the present invention includes a compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger, and a refrigeration cycle that circulates a refrigerant by connecting them with a pipe, An indoor air passage that exchanges heat with the indoor heat exchanger and blows out and circulates the air sucked from the room, and an outdoor air passage that sucks outdoor air, exchanges heat with the outdoor heat exchanger, and discharges it to the outside air And an indoor blower for carrying indoor air, an outdoor blower for carrying outdoor air, and a control device for controlling the refrigeration cycle, the indoor blower and the outdoor blower are housed in a single casing installed outdoors. In the integrated air conditioner, the pipe connection part of the refrigeration cycle is arranged in a space part separated from the indoor air duct.

  The integrated air conditioner according to the present invention provides an integrated air conditioner capable of preventing the leaked refrigerant from being conveyed to the indoor space when the refrigerant leaks at the pipe connection portion of the refrigeration cycle. can do.

  Hereinafter, an integrated air conditioner according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a conceptual diagram showing an installation state of an integrated air conditioner according to the first embodiment of the present invention, and FIG. 2 is a refrigeration cycle diagram of the integrated air conditioner according to the first embodiment of the present invention. .

  As shown in FIGS. 1 and 2, the integrated air conditioner 1 of the first embodiment is a single case that is installed outside the room and is shown by removing the front plate provided with the air blowing holes. 2 and a refrigeration cycle 3 is housed in the housing 2.

  The refrigeration cycle 3 is configured by sequentially connecting a compressor 4, a four-way valve 5, an outdoor heat exchanger 6, an expansion device 7, and an indoor heat exchanger 8 through a pipe 9.

  The housing 2 is partitioned by the partition member 10 into the outdoor heat exchanger accommodating portion 11, the connection portion accommodating portion 12, and the indoor heat exchanger accommodating portion 13 without air permeability.

  The outdoor heat exchanger accommodating portion 11 is provided with an air suction hole and an air blowing hole (not shown), and an outdoor heat exchanger 6 and an outdoor blower 14 are disposed so as to face the outdoor heat exchanger 6. Has been.

The connection part accommodating part 12 is divided by the partition member 10, and the partition member 10 includes two partition plates 10a and 10a, and has a U-shaped cross section so that the accommodation part is formed between the partition plates 10a and 10a. There is no. The storing part 12, the compressor 4 provided with an accumulator 4a, the controller 15, the refrigerant leak detector 16, Ritanheddo connecting part C ₁₄ (described later) of the indoor heat exchanger 8 is accommodated. The refrigerant leak detector 16 is provided at the bottom of the connection housing portion 12 when the refrigerant is heavier than air, and is provided at the top when the refrigerant is lighter than air. Further, the terminal portion 4b of the compressor 4 has a sealed structure suitable for explosion prevention, and is prevented from becoming an ignition source. As the sealing structure, a method of attaching a cover that can sufficiently secure the airtightness of the terminal portion, or coating the terminal portion with silicon or a highly insulating adhesive is conceivable.

  Each of the indoor heat exchanger accommodating portions 13 is provided with a suction duct 17 and a blowout duct 18 that communicate with the indoor space P and penetrate the wall surface of the building or along the outer surface of the wall body, and further, the indoor heat exchanger 8, An indoor blower 19 is disposed and accommodated facing the indoor heat exchanger 8.

  Furthermore, the connection of each component in a refrigerating cycle is demonstrated.

As shown in FIG. 2, each component is connected by a pipe 9, for example, connecting portions C ₁ and C ₂ between the compressor 4 and the four-way valve 5, and connecting portions C connecting the accumulator 4 a and the four-way valve 5. ₃ , C ₄ , the connection part C ₅ connecting the four-way valve 5 and the outdoor heat exchanger 6 is arranged in the connection part accommodating part 12.

Further, the connection part C 6 that connects the four-way valve 5 and the outdoor heat exchanger ₆ , the connection parts C ₇ and C ₈ that connect the outdoor heat exchanger 6 and the expansion device 7, and the outdoor heat exchanger 6 that is a fin tube type. The retanbend connection C ₉ is arranged in the outdoor heat exchanger housing 11.

Furthermore, the connection parts C ₁₀ and C ₁₁ connecting the expansion device 7 and the indoor heat exchanger 8, and the connection parts C ₁₂ and C ₁₃ connecting the indoor heat exchanger 8 and the four-way valve 5 are arranged in the connection part accommodating part 12. ing.

Further, as shown in FIG. 3, through the fins 8a of the finned tube of the indoor heat exchanger 8, heat transfer tube 8b that mates are communicated by Ritanbendo 8c, connected its Ritanbendo connecting part C ₁₄ is also as previously described Arranged in the part accommodating part 12.

Therefore, the pipe connection portions C _{1 to} C ₁₄ of the refrigeration cycle 3 are not present in the indoor air passage through which conditioned air circulates, that is, the indoor heat exchanger accommodating portion 13, the suction duct 17, and the outlet duct 18, and the indoor air passage and Are arranged in a partitioned space.

  In the integrated air conditioner having the above structure, a flammable refrigerant or a refrigerant mainly composed of a flammable cold butterfly is used as the refrigerant. For example, HC refrigerants such as propane have a low global warming potential (GWP) of less than about 0.2% of conventional HFC refrigerants and have a low environmental load, but are flammable, so the refrigerant leaks. May cause an explosion. For this reason, especially when it leaks into the indoor space, the refrigerant usually stays in the indoor space, so there is a high possibility that it will lead to an explosion.

  By having a structure like this integrated air conditioner, even if the refrigerant leaks from the welded connection or other connection of the indoor heat exchanger, the leaked refrigerant does not enter the indoor ventilation path, resulting in Since the flammable refrigerant is not transported to the indoor space, an explosion explosion in the room can be prevented.

Further, since the refrigerant leak detector 16 is arranged in the connecting portion accommodating portion 12, when the refrigerant leaks in the pipe connecting portions C ₁₁ and C ₁₂ and the retanbend connecting portion C _{14 and} other connecting portions, the refrigerant leak detector When 16 emits a detection signal and the air conditioner is operating, the operation is stopped. Thereby, while preventing explosion, the driving | running in the refrigerant | coolant insufficient state of the refrigerating cycle 2 can be prevented, and a failure can be prevented beforehand. Moreover, the refrigerant | coolant leak detector 16 changes an installation position with the refrigerant | coolant to be used. For example, a refrigerant having a heavier density than air, such as propane, is disposed at the bottom of the connection accommodating portion 12.

  In the integrated air conditioner of the first embodiment, since there is no pipe connection part in the indoor air passage, the leaked cold butterfly is conveyed to the indoor space even if refrigerant leaks at the weld connection part of the refrigeration cycle. Can be prevented and safe. In particular, since the weld connection part of the indoor heat exchanger, which is a pipe connection part that is a part where the refrigerant easily leaks, does not exist in the indoor air duct, it becomes safer.

  Next, the integrated air conditioner of 2nd Embodiment is demonstrated.

  In the second embodiment, the pipe connection part and the retanbend connection part of the indoor heat exchanger in the first embodiment are hermetically covered with a casing.

For example, as shown in FIG. 4, the integrated air conditioner 21 of the second embodiment is arranged in the connection portion accommodating portion 12, and each connection portion C ₁₁ , C _{12 of the} indoor heat exchanger 8 shown in FIG. 2. The retanbend connection C ₁₄ is airtightly covered by the casing 22, and the refrigerant leak detector 16 is provided at the lower part of the casing 22.

Accordingly, the connecting portions _{C 11, C 12} and Ritanbendo connecting part _{C 14} is, the controller 15, the compressor 4, independently of the ignition source space connection portion accommodating portion 12 disposed such as a motor 14a of the outdoor blower 14 Placed in the space. Accordingly, the refrigerant that has leaked at the connecting portions C _11, C ₁₂ and Ritanbendo connecting part C ₁₄ is ignited by the ignition source, it is possible to prevent the explosion. Furthermore, since the connection parts C ₁₁ and C ₁₂ and the retanbend connection part C ₁₄ are in a sealed space, the refrigerant stays at a predetermined position, and the refrigerant leak detection by the refrigerant leak detector is relatively easy. In addition, since it is not in contact with the outside air, it is possible to protect the welded connection from rainwater and other external stresses.

  In addition, since another structure is not different from the integrated air conditioner shown in FIG. 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Moreover, the integrated air conditioner of 3rd Embodiment is demonstrated.

  In the third embodiment, the casing in the second embodiment communicates with the outside air.

  For example, as shown in FIG. 5, the integrated air conditioner 31 according to the third embodiment has an outdoor heat in which a casing 32 having an opening 32 a extends so as to cross the connection portion accommodating portion 12 and air flows. It opens to and communicates with the exchanger accommodating portion 11.

Thereby, it is possible to prevent the refrigerant leaked at the pipe connection portions C ₁₁ and C ₁₂ and the retanbend connection portion C ₁₄ shown in FIG. 2 from being sucked out by the outdoor blower 14 and quickly discharged out of the casing and exploding. The outdoor blower is preferably an explosion-proof type.

  Moreover, the integrated air conditioner of 4th Embodiment is demonstrated.

  In the fourth embodiment, an exhaust bumper is provided between the outdoor heat exchanger accommodating portion and the connecting portion accommodating portion in the first embodiment, and a retanbend connecting portion of the outdoor heat exchanger is arranged in the connecting portion accommodating portion.

For example, as shown in FIG. 6, the integrated air conditioner 41 of the fourth embodiment responds to the refrigerant detection of the refrigerant leak detector 16 between the outdoor heat exchanger housing 11 and the connection housing 12. Exhaust damper 42 is provided to operate, connecting portion C ₆ connecting the four-way valve 5 and the outdoor heat exchanger 6 shown in FIG. 2, and connecting portions C ₇ and C ₈ connecting the outdoor heat exchanger 6 and the expansion device 7. And the retanbend connection part C ₉ of the outdoor heat exchanger 6 is arranged in the connection part accommodating part 12.

Thereby, when the refrigerant leaks, the refrigerant leak detector 16 detects the refrigerant and stops the operation of the air conditioner. At the same time, the exhaust damper 42 is opened, and the refrigerant leaked by the outdoor blower 14 is quickly exhausted to the outside air. Furthermore, even if there is a refrigerant leak from the connection parts C ₆ , C ₇ , C ₈ and the retinbend connection part C ₉ , explosion can be prevented. The outdoor blower is preferably an explosion-proof type.

The conceptual diagram which shows the installation state of the integrated air conditioner which concerns on 1st Embodiment of this invention. The refrigeration cycle figure of the integrated air conditioner which concerns on 1st Embodiment of this invention. The top view of the indoor heat exchanger used for the integrated air conditioner which concerns on this invention. The conceptual diagram which shows the installation state of the integrated air conditioner which concerns on 2nd Embodiment of this invention. The conceptual diagram which shows the installation state of the integrated air conditioner which concerns on 3rd Embodiment of this invention. The conceptual diagram which shows the installation state of the integrated air conditioner which concerns on 4th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Integrated air conditioner, 2 ... Housing | casing, 3 ... Refrigeration cycle, 4 ... Compressor, 5 ... Four-way valve, 6 ... Outdoor heat exchanger, 7 ... Expansion apparatus, 8 ... Indoor heat exchanger, 8c ... Ritubend , 9 ... piping, 10 ... partition member, 11 ... outdoor heat exchanger accommodating part, 12 ... connection part accommodating part, 13 ... indoor heat exchanger accommodating part, 14 ... outdoor blower, 15 ... refrigerant leak detector, 16 ... Suction duct, 17 ... blowout duct, 18 ... indoor blower.

Claims (5)

A compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger, a refrigeration cycle in which these are connected by piping to circulate the refrigerant, and the air sucked from the room is heat-exchanged by the indoor heat exchanger and blown into the room An indoor air passage to be circulated, an outdoor air passage that sucks outdoor air, exchanges heat with the outdoor heat exchanger, and discharges it to the outside air, an indoor fan that conveys indoor air, and an outdoor fan that conveys outdoor air The integrated air conditioner in which the refrigeration cycle, the indoor blower, and the control device for controlling the outdoor blower are housed in a single casing installed outdoors, wherein the piping connection part of the refrigeration cycle is the indoor air passage Is an integrated air conditioner arranged in a partitioned space. 2. The integrated air conditioner according to claim 1, wherein each connection portion and retanbend connection portion of the indoor heat exchanger are arranged in a space portion hermetically covered with a casing. 2. The integrated air conditioner according to claim 1, wherein the compressor is housed in the same space as the space in which the connecting portion of the refrigeration cycle is housed, and the terminal portion of the compressor is sealed. Machine. The integrated air conditioner according to any one of claims 1 to 3, wherein an exhaust damper that is opened when a refrigerant leaks is provided in a partition wall that forms the space. The integrated air conditioner according to any one of claims 1 to 4, wherein refrigerant leakage detection means is provided in the space.

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