JP5304741B2 - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner suppressing growth of ice on a bottom plate of an outdoor unit without using a configuration other than a refrigerating cycle such as a heater. <P>SOLUTION: The air conditioner 1 has a compressor 21, an outdoor heat exchanger 23, an outdoor electric expansion valve 24, and an indoor heat exchanger 41, and it is equipped with an outdoor fan 26, an outdoor unit casing 2B, and a hot gas bypass circuit H. The outdoor unit casing 2B has the bottom plate 2b, and the outdoor heat exchanger 23 and the outdoor fan 26 are housed in a space on the bottom plate 2b. The hot gas bypass circuit H is disposed so as to pass below the outdoor fan 26 and below the outdoor heat exchanger 23, and it bypasses at least either one of an indoor side liquid pipe C extending from the indoor heat exchanger 41 to the outdoor electric expansion valve 24, and an outdoor side liquid pipe D extending from the outdoor electric expansion valve 24 to the outdoor heat exchanger 23, and a discharge pipe A of a discharge side of the compressor 21. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an air conditioner.

  During the heating operation, the heat exchanger provided in the outdoor unit functions as a refrigerant evaporator. For this reason, outdoor air may condense on the surface of the outdoor heat exchanger and drain water may be generated. In such a situation, the outdoor unit of the air conditioner may be exposed to an environment of 0 ° C. or lower in winter, so that the drain water may freeze. For this reason, the surface of the outdoor heat exchanger may be covered with ice, and the heat exchange performance may deteriorate.

On the other hand, in the air conditioning apparatus shown in Patent Document 1 below, a technique has been proposed in which a heater is installed on the upper surface side of the bottom plate that supports the outdoor heat exchanger of the outdoor unit to prevent icing. Since water thawed using this heater or drain water is drained through a drain hole provided in the bottom plate, the growth of ice on the top surface of the bottom plate can be suppressed.
JP 2008-96018 A

  However, in the air conditioner as described above, it is necessary to prepare a heater separately from the refrigeration cycle in order to suppress the growth of ice on the bottom plate of the outdoor unit. For this reason, the number of parts has increased.

  This invention is made | formed in view of the point mentioned above, The subject of this invention can suppress the growth of the ice on the baseplate of an outdoor unit, without using structures other than refrigeration cycles, such as a heater. An object is to provide an air conditioner.

An air conditioner according to a first aspect of the present invention is an air conditioner having a compression mechanism, a heat source side heat exchanger, an expansion mechanism, and a use side heat exchanger, and includes a blower, a casing, and a bypass circuit. The blower supplies an air flow to the heat source side heat exchanger. The housing has a bottom plate and houses the heat source side heat exchanger and the blower in a space above the bottom plate. Bypass circuit, one at least one of the second refrigerant pipe extending from the first refrigerant pipe or the expansion mechanism extends from the usage-side heat exchanger up to the expansion mechanism up to the heat source-side heat exchanger, the compression mechanism This bypasses the third refrigerant pipe on the discharge side. The bypass circuit is disposed so as to pass vertically below the blower and vertically below the heat source side heat exchanger. The bypass circuit extends from the third refrigerant pipe to the first refrigerant pipe or the second refrigerant pipe through the vertical lower part of the blower after passing through the vertical lower part of the blower. The heat source side heat exchanger includes a compression mechanism side passage port that is a refrigerant passage port on the compression mechanism side, an expansion mechanism side passage port that is a refrigerant passage port on the expansion mechanism side, and from the compression mechanism passage port to the expansion mechanism passage port. And a heat exchange path extending so as to exchange heat between the refrigerant passing between and the external fluid. The thermal AC path connects the first branch point, the second branch point provided closer to the expansion mechanism side passage port than the first branch point, and the first branch point and the second branch point through independent paths. The first branch pipe and the second branch pipe, the second branch point and the expansion mechanism side passage port are connected, and the first branch pipe and the second branch pipe pass below at least one of the first branch pipe and the second branch pipe, And a junction pipe communicating with both the first branch pipe and the second branch pipe. The junction pipe passes vertically above the bypass circuit.

  In this air conditioner, depending on the environment of the installation location of the housing, the upper side of the bottom plate may get wet by rain water or drain water generated in the heat source side heat exchanger. On the other hand, here, the bypass circuit is provided so that the bypass circuit passes through a portion of the bottom plate of the housing that is vertically below the blower and vertically below the heat source side heat exchanger. For this reason, the vicinity of the portion through which the bypass circuit passes can be heated without using another heat source such as a heater. Therefore, even if the upper side of the bottom plate gets wet, it is possible to prevent the ice from growing on the bottom plate vertically below the blower and vertically below the heat source side heat exchanger. As a result, it is possible to avoid a situation where the driving of the blower is hindered by ice or a situation where the surface of the heat source side heat exchanger is covered with ice and the heat exchange efficiency is reduced.

  Further, in this air conditioner, it is possible to preferentially prevent ice growth in the vertically lower part of the blower.

  Moreover, in this air conditioning apparatus, the heat exchange effective area can be increased by supplying the refrigerant to both the first branch pipe and the second branch pipe. And it can make it hard to form ice under the heat source side heat exchanger with the refrigerant | coolant which flows into a merging pipe intensively.

  Although the lower part of the heat source side heat exchanger can be warmed by the junction pipe, the lower part of the blower tends to have a temperature that depends on changes in the surrounding environment, and it may be difficult to suppress the growth of ice. On the other hand, in this air conditioner, prior to the supply of hot gas to the lower side of the blower, the supply of hot gas to the lower side of the blower is given priority over the supply of hot gas to the lower side of the heat source side heat exchanger. By sending the hot gas to the lower side of the blower, it is possible to more reliably suppress the ice growth below the blower.

  The air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect of the present invention, wherein the bottom plate has an opening penetrating in the thickness direction in a portion located on the blower side with respect to the heat source side heat exchanger in plan view. Does not have.

  In this air conditioner, the bottom plate does not have an opening in the vicinity of the blower vertically below. For this reason, in a state where the blower is driven, it is possible to prevent an air flow that does not pass through the heat source side heat exchanger from being generated through a portion located on the blower side with respect to the heat source side heat exchanger in a plan view. it can. Also, when water adheres to the bottom of the blower vertically, there is no opening near it, so freezing is likely to occur. However, priority is given to the vertical bottom of the blower by the refrigerant through the bypass circuit. Supply of heat. Thereby, the growth of ice in the vertically lower part of the blower can be efficiently suppressed while improving the passage efficiency of the air flow generated by the blower with respect to the heat source side heat exchanger.

  The air conditioner according to a third aspect of the present invention is the air conditioner according to the first or second aspect, wherein the bottom plate has a drain outlet that penetrates in the thickness direction below the heat source side heat exchanger.

  In this air conditioner, the water accumulated below the heat source side heat exchanger in the bottom plate can be drained by the drain port. On the other hand, the water accumulated below the blower in the bottom plate is likely to freeze because there is no opening near it, but the bottom plate below the blower is caused by the refrigerant through the bypass circuit. A preferential heat supply is provided. Thereby, priority is given to the lower part of the air blower where water is likely to freeze rather than the lower part of the heat source side heat exchanger, so that the growth of ice can be efficiently suppressed.

  An air conditioner according to a fourth aspect of the present invention is the air conditioner according to any one of the first to third aspects, wherein the heat source side heat exchanger further includes fins. The fin penetrates at least one of the first branch pipe and the second branch pipe and the merge pipe, and at least one of the first branch pipe and the second branch pipe and the through part of the merge pipe Are connected.

  In this air conditioner, it is possible to use one fin in common for heat exchange of at least one of the first branch pipe and the second branch pipe and heat exchange of the junction pipe.

  An air conditioner according to a fifth aspect of the present invention is the air conditioner according to any one of the first to fourth aspects of the present invention, wherein the bottom plate is formed such that at least a part near the passage portion of the bypass circuit sinks downward. It has a bypass groove. At least a part of the bypass circuit is disposed in a space on the upper surface side of the bypass groove and lower than the periphery of the bypass groove.

  In this air conditioner, drain water, rainwater, or the like tends to accumulate in a portion of the bottom plate where the bypass groove is formed. On the other hand, in this case, a part of the bypass circuit is disposed in a space on the upper surface side of the bypass groove and lower than the periphery of the bypass groove. For this reason, water and ice in the bypass groove can be warmed by the refrigerant flowing through the bypass circuit. This makes it possible to improve the effect of suppressing the growth of ice above the bottom plate.

  An air conditioner according to a sixth aspect is the air conditioner according to the fifth aspect, wherein the bypass groove has an inclined portion. The bottom plate has a groove opening penetrating in the thickness direction in the vicinity of the lower end of the inclined portion of the bypass groove. Here, the groove opening of the sixth invention and the drain outlet of the third invention may be the same opening.

  In this air conditioner, drain water accumulated in the bypass groove or water generated by thawing ice can be guided to the groove opening and drained from the groove opening. Accordingly, it is possible to prompt the drainage of water before the freezing of drain water or the re-freezing of water generated by thawing.

  An air conditioner according to a seventh aspect is the air conditioner according to the sixth aspect, wherein the bypass circuit has an inclined portion such that a portion passing above the groove opening is a lower end.

  In this air conditioner, the water flowing along the vicinity of the lower end of the bypass pipe is also led to the vicinity of the upper part of the groove opening by the inclination. Thereby, drainage can be promoted.

  The air conditioner according to an eighth aspect of the present invention is the air conditioner according to the sixth aspect or the seventh aspect, wherein at least a part of the bypass circuit passing through the heat source side heat exchanger vertically below the groove opening. Is located.

  In this air conditioner, since at least a part of the bypass circuit that flows vertically below the heat source side heat exchanger passes above the groove opening, the groove opening is blocked by icing or re-freezing. It becomes possible to prevent.

  An air conditioner according to a ninth aspect of the present invention is the air conditioner according to any one of the first to eighth aspects, further comprising a connection switching valve connected to an end of the third refrigerant pipe opposite to the compression mechanism side. ing. The connection switching valve has a first connection state that guides the refrigerant discharged from the compression mechanism to the use side heat exchanger side, and a second connection state that guides the refrigerant discharged from the compression mechanism to the heat source side heat exchanger side. Switching is possible.

  In this air conditioner, both the cooling operation and the heating operation can be realized by switching the connection state.

  In addition, the supercooling degree of the part which is a refrigerant | coolant sent to an expansion mechanism at the time of air_conditionaing | cooling operation and flows through a confluence | merging pipe can be prepared. Thereby, even if an error occurs in the degree of supercooling for each branch pipe by passing through the first and second branch pipes, the degree of supercooling of the refrigerant flowing out from the heat source side heat exchanger can be made uniform. Become.

  An air conditioner according to a tenth aspect of the present invention is the air conditioner according to any one of the first to ninth aspects, wherein the bypass circuit has a pressure reducing mechanism for reducing the pressure of the refrigerant passing therethrough, from the expansion mechanism to the heat source side. The second refrigerant pipe extending to the heat exchanger and the third refrigerant pipe on the discharge side of the compression mechanism are bypassed.

  In this air conditioner, the pressure of the refrigerant discharged from the compression mechanism can be reduced to approach the bypass destination pressure. For this reason, the extent to which the refrigerant pressure flowing through the second refrigerant pipe rises due to the supply of hot gas to the second refrigerant pipe through the bypass circuit can be suppressed.

  An air conditioner according to an eleventh aspect of the present invention is the air conditioner according to any one of the first to tenth aspects, further comprising a bypass switching unit capable of switching between a state allowing the refrigerant flow in the bypass circuit and a state not allowing it. ing.

  In this air conditioner, it is possible to switch between using the bypass circuit and not using it.

  In the air conditioner of the twelfth aspect of the invention, in the air conditioner of the eleventh aspect of the invention, when the defrost operation is performed to remove frost adhering to the heat source side heat exchanger, the state of the bypass switching unit is allowed to flow in the bypass circuit And a switching control unit for switching to the state to be performed.

  In this air conditioner, if the refrigerant is always flowed to the bypass circuit, the heating capacity is reduced. On the other hand, since it is limited here when performing a defrost driving | operation, the fall of heating capability can be suppressed small.

  In the air conditioner according to the first aspect of the present invention, it is possible to avoid a situation where the driving of the blower is hindered by ice or a situation where the surface of the heat source side heat exchanger is covered with ice and the heat exchange efficiency is reduced. . Moreover, it is possible to preferentially prevent ice growth in the vertically lower part of the blower. Moreover, it is possible to make it difficult for ice to be formed vertically below the heat source side heat exchanger while increasing the heat exchange effective area.

  In the air conditioner according to the second aspect of the present invention, it is possible to efficiently suppress the growth of ice in the vertically lower side of the blower while improving the passage efficiency of the air flow generated by the blower to the heat source side heat exchanger.

  In the air conditioner according to the third aspect of the invention, it is possible to prioritize the vertical downward direction of the blower where water is likely to freeze rather than the vertical downward direction of the heat source side heat exchanger to efficiently suppress ice growth.

  In the air conditioner of the fourth invention, it is possible to use one fin in common.

  In the air conditioner of the fifth aspect of the invention, it is possible to improve the effect of suppressing the growth of ice above the bottom plate.

  In the air conditioner according to the sixth aspect of the present invention, it is possible to prompt the drainage of water before freezing of the ren water or re-freezing of the water generated by thawing.

  In the air conditioner of the seventh aspect, drainage can be promoted.

  In the air conditioner according to the eighth aspect of the invention, it is possible to prevent the groove opening from being blocked by freezing or refreezing.

  In the air conditioning apparatus of the ninth aspect, both the cooling operation and the heating operation can be realized by switching the connection state.

  In the air conditioner according to the tenth aspect of the present invention, the degree to which the refrigerant pressure flowing through the second refrigerant pipe rises due to the supply of hot gas to the second refrigerant pipe through the bypass circuit can be suppressed.

  In the air conditioner according to the eleventh aspect of the present invention, it is possible to switch between using the bypass circuit and not using it.

  In the air conditioner according to the twelfth aspect of the present invention, the decrease in heating capacity can be kept small.

It is a refrigerant circuit figure of the air harmony device concerning one embodiment of the present invention. It is an external appearance perspective view including the front side of an outdoor unit. It is an internal arrangement configuration perspective view of an outdoor unit. It is a perspective view which shows the positional relationship etc. of the baseplate of an outdoor unit, and an outdoor heat exchanger. It is an external appearance perspective view including the back side of an outdoor unit. It is an external appearance perspective view of an electromagnetic induction heating unit. It is a section lineblock diagram of an electromagnetic induction heating unit. It is an external appearance perspective view which shows the state which removed the shielding cover from the electromagnetic induction heating unit. It is an external appearance perspective view of the bobbin main body by which the coil was wound. It is a front view of a bobbin main body. It is a conceptual diagram which shows the electric power supply to an electromagnetic induction heating unit. It is a bottom view in the state where the shielding cover of the electromagnetic induction heating unit was removed. It is a top view which shows the part located in the outer side of a 1st bobbin cover. It is a bottom view which shows the part located inside a 1st bobbin cover. It is an external appearance perspective view of a thermistor. It is an external perspective view of a fuse. It is a figure which shows the mode of the magnetic flux produced in the state without a shielding cover. It is a figure which shows the mode of the magnetic flux produced in the state which provided the shielding cover. It is a whole front perspective view which shows the internal structure of the machine room of an outdoor unit. It is the whole back perspective view showing the internal structure of an outdoor unit. It is a perspective view which shows the internal structure of the machine room of an outdoor unit. It is a right view of the internal structure of the machine room of an outdoor unit. It is a rear view of the machine room of an outdoor unit. It is a perspective view of a bottom plate of an outdoor unit and an outdoor heat exchanger. It is a top view in the state where the ventilation mechanism of the outdoor unit was removed. It is a top view of the bottom plate of an outdoor unit. It is a front view of the bottom plate of an outdoor unit. It is a rear view of the bottom plate of an outdoor unit. It is a left view of the bottom plate of an outdoor unit. It is a right view of the baseplate of an outdoor unit. It is sectional drawing of the BB cross section in FIG. It is sectional drawing of CC cross section in FIG. It is sectional drawing of the DD cross section in FIG. It is a block diagram of the vicinity of the NN cross section in FIG. It is a top view which shows the arrangement | positioning relationship between the baseplate of an outdoor unit, and a hot gas bypass circuit. It is a front view which shows the arrangement | positioning relationship between the baseplate in the fan blade lower part vicinity, and a hot gas bypass circuit. It is a refrigerant circuit figure of other embodiment (B). It is a refrigerant circuit figure of other embodiment (C).

  Hereinafter, an electromagnetic induction heating unit 6 and an air conditioner 1 including the electromagnetic induction heating unit 6 according to an embodiment of the present invention will be described by way of example with reference to the drawings.

<1-1> Air conditioner 1
FIG. 1 is a refrigerant circuit diagram showing a refrigerant circuit 10 of the air conditioner 1.

  The air conditioner 1 is an air conditioner in a space where a use side device is arranged by connecting an outdoor unit 2 as a heat source side device and an indoor unit 4 as a use side device by a refrigerant pipe. , Compressor 21, four-way switching valve 22, outdoor heat exchanger 23, outdoor electric expansion valve 24, accumulator 25, outdoor fan 26, indoor heat exchanger 41, indoor fan 42, hot gas bypass valve 27, capillary tube 28 and An electromagnetic induction heating unit 6 and the like are provided.

  The compressor 21, the four-way switching valve 22, the outdoor heat exchanger 23, the outdoor electric expansion valve 24, the accumulator 25, the outdoor fan 26, the hot gas bypass valve 27, the capillary tube 28, and the electromagnetic induction heating unit 6 are included in the outdoor unit 2. Is housed in. The indoor heat exchanger 41 and the indoor fan 42 are accommodated in the indoor unit 4.

  The refrigerant circuit 10 includes a discharge pipe A, an indoor gas pipe B, an indoor liquid pipe C, an outdoor liquid pipe D, an outdoor gas pipe E, an accumulator pipe F, a suction pipe G, a hot gas bypass circuit H, and a branch pipe K. And a merging pipe J. The indoor side gas pipe B and the outdoor side gas pipe E pass a large amount of refrigerant in the gas state, but the refrigerant passing therethrough is not limited to the gas refrigerant. The indoor side liquid pipe C and the outdoor side liquid pipe D pass a large amount of liquid refrigerant, but the refrigerant passing therethrough is not limited to liquid refrigerant.

  The discharge pipe A connects the compressor 21 and the four-way switching valve 22.

  The indoor side gas pipe B connects the four-way switching valve 22 and the indoor heat exchanger 41.

  The indoor side liquid pipe C connects the indoor heat exchanger 41 and the outdoor electric expansion valve 24. The outdoor liquid pipe D connects the outdoor electric expansion valve 24 and the outdoor heat exchanger 23.

  The outdoor gas pipe E is connected to the outdoor heat exchanger 23 and the four-way switching valve 22.

  The accumulator pipe F connects the four-way switching valve 22 and the accumulator 25, and extends in the vertical direction when the outdoor unit 2 is installed. An electromagnetic induction heating unit 6 is attached to a part of the accumulator tube F. Of the accumulator tube F, at least the heated portion covered by the electromagnetic induction heating unit 6 is configured such that the SUS (Stainless Used Steel) tube F2 covers the periphery of the copper tube F1 (see FIG. 7). ). Portions other than the SUS pipe among the pipes constituting the refrigerant circuit 10 are made of copper pipes. In addition, the material of the pipe | tube covering the circumference | surroundings of the said copper pipe | tube is not limited to SUS, For example, at least 2 or more types of metals chosen from conductors, such as iron, copper, aluminum, chromium, nickel, and these groups are used. It can be an alloy or the like. Examples of SUS include three types of ferrite, martensite, and austenite, and combinations of these types. Further, the accumulator tube F here does not have to be provided with a magnetic material and a material containing the magnetic material, and may be any material as long as it contains a material to be subjected to induction heating. For example, the magnetic material may constitute all of the accumulator pipe F, or may be formed only on the inner surface of the accumulator pipe F, and is contained in the material constituting the accumulator pipe F pipe. May exist. By performing electromagnetic induction heating in this manner, the accumulator tube F can be heated by electromagnetic induction, and the refrigerant sucked into the compressor 21 via the accumulator 25 can be warmed. Thereby, the heating capability of the air conditioning apparatus 1 can be improved. Further, for example, even when the compressor 21 is not sufficiently warmed at the time of starting the heating operation, the lack of capacity at the time of starting can be compensated for by the rapid heating by the electromagnetic induction heating unit 6. Further, when the four-way switching valve 22 is switched to the cooling operation state and the defrost operation is performed to remove the frost attached to the outdoor heat exchanger 23 or the like, the electromagnetic induction heating unit 6 quickly opens the accumulator tube F. By heating, the compressor 21 can compress the rapidly heated refrigerant as a target. For this reason, the temperature of the hot gas discharged from the compressor 21 can be raised rapidly. Thereby, the time required to thaw frost by defrost operation can be shortened. Thereby, even if it is necessary to perform a defrost operation in a timely manner during the heating operation, the operation can be returned to the heating operation as soon as possible, and the user's comfort can be improved.

  The suction pipe G connects the accumulator 25 and the suction side of the compressor 21.

  The hot gas bypass circuit H connects a branch point A1 provided in the middle of the discharge pipe A and a branch point D1 provided in the middle of the outdoor liquid pipe D. The hot gas bypass circuit 27 is provided with a hot gas bypass valve 27 that can switch between a state that allows passage of refrigerant and a state that does not allow passage of the refrigerant.

  The branch pipe K constitutes a part of the outdoor heat exchanger 23, and a refrigerant pipe extending from the gas side inlet / outlet 23e of the outdoor heat exchanger 23 will be described later in order to increase the effective surface area for heat exchange. It is a pipe branched into a plurality of lines at a branching junction 23k. The branch pipe K includes a first branch pipe K1, a second branch pipe K2, and a third branch pipe K3 that extend independently from the branch junction point 23k to the junction branch point 23j. The pipes K1, K2, and K3 merge at the merge branch point 23j. Note that, when viewed from the merging pipe J side, the branch pipe K extends at a merging branch point 23j.

  The junction pipe J constitutes a part of the outdoor heat exchanger 23 and extends from the junction branch point 23j to the liquid side inlet / outlet 23d of the outdoor heat exchanger 23. The junction pipe J can unify the degree of supercooling of the refrigerant flowing out of the outdoor heat exchanger 23 during the cooling operation, and can defrost frosted ice near the lower end of the outdoor heat exchanger 23 during the heating operation. . The junction pipe J has a cross-sectional area that is approximately three times the cross-sectional area of each of the branch pipes K1, K2, and K3, and the amount of refrigerant passing through is approximately three times that of each of the branch pipes K1, K2, and K3. .

  The four-way switching valve 22 can switch between a cooling operation cycle and a heating operation cycle. In FIG. 1, the connection state when performing the heating operation is indicated by a solid line, and the connection state when performing the cooling operation is indicated by a dotted line. During the heating operation, the indoor heat exchanger 41 functions as a refrigerant cooler, and the outdoor heat exchanger 23 functions as a refrigerant heater. During the cooling operation, the outdoor heat exchanger 23 functions as a refrigerant cooler, and the indoor heat exchanger 41 functions as a refrigerant heater.

  The outdoor heat exchanger 23 includes a gas side inlet / outlet 23e, a liquid side inlet / outlet 23d, a branch junction 23k, a junction branch point 23j, a branch pipe K, a junction pipe J, and a heat exchange fin 23z. The gas side inlet / outlet 23 e is located at the end of the outdoor heat exchanger 23 on the outdoor gas pipe E side, and is connected to the outdoor gas pipe E. The liquid side inlet / outlet 23 d is located at the end of the outdoor heat exchanger 23 on the outdoor liquid pipe D side, and is connected to the outdoor liquid pipe D. The branch junction 23k branches a pipe extending from the gas side inlet / outlet port 23e, and can branch or join the refrigerant according to the direction of the flowing refrigerant. A plurality of branch pipes K extend from each branch portion at the branch junction 23k. The junction branch point 23j joins the branch pipe K and can join or branch the refrigerant according to the direction of the flowing refrigerant. The junction pipe J extends from the junction branch point 23j to the liquid side inlet / outlet 23d. The heat exchange fins 23z are configured by arranging a plurality of plate-like aluminum fins in the thickness direction and arranged at predetermined intervals. The branch pipe K and the merge pipe J both have the heat exchange fins 23z as a common penetration target. Specifically, the branch pipe K and the junction pipe J are disposed so as to penetrate in the plate pressure direction at different portions of the common heat exchange fin 23z.

  The outdoor control unit 12 that controls the devices arranged in the outdoor unit 2 and the indoor control unit 13 that controls the devices arranged in the indoor unit 4 are connected by the communication line 11a, so that the control unit 11 is constituted. The control unit 11 performs various controls for the air conditioner 1.

<1-2> Outdoor unit 2
In FIG. 2, the external appearance perspective view of the front side of the outdoor unit 2 is shown. In FIG. 3, the external appearance perspective view of the back side of the outdoor unit 2 is shown. In FIG. 4, the perspective view about the positional relationship with the outdoor heat exchanger 23 and the outdoor fan 26 is shown. In FIG. 5, the perspective view about the positional relationship with the outdoor heat exchanger 23 and the baseplate 2b is shown.

  The outdoor unit 2 has an outer surface formed by a substantially rectangular parallelepiped outdoor unit casing that includes a top plate 2a, a bottom plate 2b, a front panel 2c, a left side panel 2d, a right side panel 2f, and a back panel 2e.

  In the outdoor unit 2, an outdoor heat exchanger 23, an outdoor fan 26, and the like are arranged, a blower room on the left side panel 2d side, a compressor 21 and an electromagnetic induction heating unit 6 are arranged, and the right side panel 2f side. Are separated from each other through a partition plate 2h (see FIG. 19 and the like). The electromagnetic induction heating unit 6 is disposed at an upper position in the vicinity of the left side panel 2d and the top plate 2a in the machine room. Here, the heat exchange fins 23z of the outdoor heat exchanger 23 described above are arranged side by side in the plate thickness direction so that the plate thickness direction is substantially horizontal. The joining pipe J is disposed in the lowermost portion of the heat exchange fins 23z of the outdoor heat exchanger 23 by penetrating the heat exchange fins 23z in the thickness direction. The hot gas bypass circuit H is arranged along the lower side of the outdoor fan 26 and the outdoor heat exchanger 23.

<1-3> Electromagnetic induction heating unit 6
FIG. 6 shows a schematic perspective view of the electromagnetic induction heating unit 6. FIG. 7 shows a cross-sectional view of the electromagnetic induction heating unit 6. FIG. 8 shows an external perspective view of the electromagnetic induction heating unit 6 with the shielding cover 75 removed.

  The electromagnetic induction heating unit 6 is disposed so as to cover the heated portion of the accumulator tube F from the outside in the radial direction, and heats the heated portion by electromagnetic induction heating. The heated portion of the accumulator tube F has a double tube structure having an inner copper tube F1 and an outer SUS tube F2. In order to position the electromagnetic induction heating unit 6 with respect to the accumulator tube F before fixing the electromagnetic induction heating unit 6 to the accumulator tube F, a binding 97 as shown in FIG. 11 is used. Thereby, fixing work can be performed while the position of the electromagnetic induction heating unit 6 with respect to the accumulator tube F is fixed, and workability is good.

  The electromagnetic induction heating unit 6 includes a first hexagon nut 61, a second hexagon nut 66, a C-shaped ring 62, a first bobbin lid 63, a second bobbin lid 64, a bobbin main body 65, a first ferrite case 71, and a second ferrite case. 72, a third ferrite case 73, a fourth ferrite case 74, a first ferrite 98, a second ferrite 99, a coil 68, a shielding cover 75, the thermistor 14 and a fuse 15.

  The first hexagon nut 61 is made of resin, and fixes the electromagnetic induction heating unit 6 to the accumulator tube F near the upper end. The second hexagon nut 66 is made of resin, and fixes the electromagnetic induction heating unit 6 to the accumulation tube F near the lower end.

  The C-shaped ring 62 is made of resin, and is fixed in surface contact with the accumulator tube F in cooperation with the first hexagon nut 61 and the first bobbin lid 63. Although not shown, the second hexagon nut 66 and the second bobbin lid 64 are fixed in surface contact with the accumulator tube F in cooperation with the second hexagon nut 66 and the second bobbin lid 64.

  The first bobbin lid 63 is made of resin and is one member for determining the relative position between the accumulator tube F and the coil 68 in the electromagnetic induction heating unit 6. The accumulator tube F is disposed above the electromagnetic induction heating unit 6. Cover from the surroundings. The second bobbin lid 64 is made of resin and has the same shape as the first bobbin lid 63, and covers the accumulator tube F from the periphery below the electromagnetic induction heating unit 6. FIG. 13 shows a top view of the first bobbin lid 63. FIG. 14 shows a bottom view of the first bobbin lid 63. The first bobbin lid 63 is connected to the first hexagon nut 61 and the C-shaped ring 62 while penetrating the accumulator tube F, and a tubular portion 63c for piping for fixing the accumulator tube F and the electromagnetic induction heating unit 6 to each other. have. The first bobbin lid 63 has a substantially T-shaped hook-shaped portion 63a formed inwardly from the outer peripheral portion in order to hold the coil first portion 68b and the coil second portion 68c while passing therethrough. Yes. The first bobbin lid 63 has a plurality of heat radiation openings 65b penetrating in the vertical direction in order to release heat accumulated between the bobbin main body 65 and the SUS tube F2 to the outside. The first bobbin lid 63 has four screw holes 63 d for screws 69 for screwing the first to fourth ferrite cases 71 to 74 through the screws 69. Further, the first bobbin lid 63 has a fuse insertion opening 63e and a thermistor insertion opening 63f. This fuse insertion opening 63d is an opening when the fuse 15 shown in FIG. 16 is attached, and is an opening having a shape along the outer edge shape when the fuse 15 is inserted. The thermistor insertion opening 63f is an opening for attaching the thermistor 14 shown in FIG. 15, and is an opening along the outer edge shape of the thermistor 14 as viewed in the insertion direction. Since the thermistor 14 and the fuse 15 are attached from below the electromagnetic induction heating unit 6, the thermistor insertion opening 63f and the fuse insertion opening 63d of the first bobbin lid 63 exhibit the same heat radiation function as the heat radiation opening 63b. become. Here, since warm air to be radiated accumulates in the upper space in the bobbin main body 65, it is possible to efficiently radiate heat by providing more upper radiating openings than below. The thermistor 14 is inserted into the thermistor insertion opening 63f of the second bobbin lid 64, and the fuse 15 is inserted into the fuse insertion opening 63d of the second bobbin lid 64 and attached thereto. As shown in FIG. 14, on the lower surface side of the first bobbin lid 63, a bobbin cylinder upper portion 65 g that fits the bobbin main body 65 by being positioned inside an upper end cylindrical portion (described later) of the bobbin main body 65 is downward. It extends. The bobbin cylinder upper portion 65g extends from the portion along the outer edge of each opening in the penetrating direction so as not to close the penetrating state of the heat radiation opening 63b, the screw hole 63d, the fuse insertion opening 63e, and the thermistor insertion opening 63f. It is formed to extend. Note that the opening and shape of the first bobbin lid 63 are the same for the second bobbin lid 64, and each member number of the 63rd series in the first bobbin lid 63 is the same as that of the 64th series in the second bobbin lid 64. It shows corresponding to each member number, and the description is omitted. The second bobbin lid 64 also has a pipe cylinder upper portion 64c (see FIG. 7), like the first bobbin lid 63, and is fitted to the lower end cylindrical portion (described later) of the bobbin main body 65. Fit.

  The bobbin main body 65 is wound with a coil 68 as shown in the schematic perspective view of FIG. As shown in FIG. 10, the bobbin main body 65 has a cylindrical portion 65a having a cylindrical shape. The bobbin main body 65 has a first anti-winding portion 65s formed to protrude in the radial direction at a portion slightly lowered from the upper end, and a second anti-winding portion formed to protrude in the radial direction at a portion slightly raised from the lower end. 65t. An upper end cylindrical portion 65x extends above the first winding stop portion 65s. A lower end cylindrical portion 65y extends below the second winding stop portion 65t. The first winding stop portion 65s has a first coil holding portion 65b that further protrudes radially outward. The first coil holding portion 65b is formed to be recessed inward in the radial direction so as to sandwich the coil second portion 68c, and the coil holding groove 65c formed to be recessed inward in the radial direction so as to sandwich the coil first portion 68b. Coil holding groove 65d. Similar to the first winding stopper 65s, the second winding stopper 65t has a second coil holder 65e formed with coil holding grooves 65f and 65g. As shown in the bottom view of the electromagnetic induction heating unit 6 in FIG. 12, the coil holding grooves 65f and 65g formed in the bobbin main body 65 are hooked to the second bobbin lid 64 when viewed from the direction in which the accumulator tube F extends. Since the outer side is covered with the shape portion 64a, the coil first portion 68b and the coil second portion 68c can be held more reliably. Further, since the coil holding grooves 65f and 65g and the hook-shaped portion 64a are arranged so as to be shifted in the direction in which the accumulator tube F extends, the coil holding portion 65b and the coil second portion 68c are extended in the extending direction. Since it can hold | maintain in multiple places, it can be made hard to produce local load with respect to the coil 68. FIG. In the bobbin main body 65, a space is formed between the accumulator tube F on the inner side of the accumulator tube F side, and the magnetic flux generated when current flows through the coil 68 is more efficiently used. The distance is taken to pass through F2.

  The first ferrite case 71 sandwiches the first bobbin lid 63 and the second bobbin lid 64 from the direction in which the accumulator tube F extends. The first ferrite case 71 has a portion for accommodating a first ferrite 98 and a second ferrite 99 described later. The second ferrite case 72, the third ferrite case 73, and the fourth ferrite case 74 are also the same as the first ferrite case 71, and these include the bobbin body 65, the first bobbin lid 63, and the second bobbin lid 64. It arrange | positions in the position which covers from the outer four directions. As shown in FIGS. 6, 8, and 12, the first bobbin lid 63 is screwed and fixed to the first to fourth ferrite cases 71 to 74 via metal screws 69.

  The first ferrite 98 is made of ferrite, which is a material with high magnetic permeability, and collects magnetic flux generated in portions other than the SUS tube F2 when a current is passed through the coil 68 to form a path for the magnetic flux. In particular, the first ferrite 98 is accommodated in the accommodating portions of the first to fourth ferrite cases 71 to 74 near the upper end and the lower end of the electromagnetic induction heating unit 6. The second ferrite 99 is also the same as the first ferrite 98 except for the arrangement position and shape, and is arranged at a position near the outside of the bobbin main body 65 in the accommodating portion of the first to fourth ferrite cases 71 to 74. . Here, when the first ferrite 98 and the second ferrite 99 are not provided, for example, as shown in FIG. 17, the magnetic flux leaks out to the surroundings. On the other hand, in the electromagnetic induction heating unit 6 of this embodiment, since the first ferrite 98 and the second ferrite 99 are provided outside the coil 68, magnetic flux flows as shown in FIG. Can be reduced.

  The coil 68 has a coil winding portion 68a wound spirally around the direction in which the accumulator tube F extends outside the bobbin main body 65, and a coil second portion extending to one end side of the coil 68 with respect to the coil winding portion 68a. 1 part 68b and the coil 2nd part 68c extended to the other end side opposite to the one end side of the coil 68 are provided. The coil 68 is located inside the first to fourth ferrite cases 71 to 74. The coil first portion 68b and the coil second portion 68c are connected to the control printed board 18 as shown in FIG. The coil 68 is supplied with a high-frequency current from the control printed board 18. The control printed circuit board 18 is controlled by the control unit 11. When the supply of the high frequency current is received, the coil winding portion 68a generates a magnetic flux. Specifically, as shown by a dotted line in FIG. 18, the nearest part from the coil winding part 68a of the SUS tube F2, and the nearest part from the coil winding part 68a of the first ferrite 98, the second ferrite 99 and the shielding cover 75. Then, a magnetic flux is generated so as to have a substantially elliptical shape on a surface that is radially with respect to the accumulator tube F and extends in the axial direction. Due to the magnetic flux thus generated, the SUS tube F2 generates a current (eddy current) by electromagnetic induction. Here, when a current flows through the SUS tube F2, heat is generated in a portion that becomes an electric resistance. Thus, the coil 68 can be arranged so that the axial direction is substantially the same as the axial direction of the accumulator tube F simply by winding the coil 68 around the outside of the bobbin main body 65. And by arrange | positioning the coil 68 in a substantially cylindrical shape, more magnetic flux can be supplied with respect to the SUS pipe | tube F2 of the accumulation pipe | tube F, and the heating efficiency can be improved. Here, as a material of the coil 68, a copper wire which is a good conductor is used from the viewpoint of efficiently generating a magnetic flux. The material of the coil 68 is not particularly limited as long as electricity can flow.

  As can be seen by comparing FIG. 6 and FIG. 8, the shielding cover 75 is disposed on the outermost peripheral portion of the electromagnetic induction heating unit 6 and collects magnetic flux that cannot be drawn by the first ferrite 98 and the second ferrite 99 alone. As shown in FIG. 6, the shielding cover 75 is fixed to the first ferrite case 71 by being screwed through screws 70a, 70b, 70c, and 70d. Thereby, in the electromagnetic induction heating unit 6, almost no leakage magnetic flux is generated outside the shielding cover 75, and the location where the magnetic flux is generated can be determined.

  As shown in FIG. 15, the thermistor 14 is attached so as to be in direct contact with the outer surface of the accumulator tube F, and has a thermistor detector 14a, an outer protrusion 14b, a side protrusion 14c, and a thermistor wiring 14d. The thermistor detection unit 14a has a shape that follows the curved shape of the outer surface of the accumulator tube F, and has a substantial contact area. The outer protrusion 14 b is a protrusion that protrudes in a direction away from the accumulator tube F in the attached state of the thermistor 14, and has a shape along the edge of the thermistor insertion opening 63 f of the second bobbin lid 64. Similarly to the outer protrusion 14b, the side protrusion 14c has a shape along the edge of the thermistor insertion opening 63f of the second bobbin lid 64 and extends away from the outer protrusion 14b. The thermistor wiring 14d transmits the detection result of the thermistor detection unit 14a as a signal to the control unit 11. The thermistor 14 is inserted upward in FIG. 15, but has an outer protrusion 14b and a side protrusion 14c, and thus has an asymmetric shape as viewed from the insertion direction, like the thermistor insertion opening 63f. Yes. For this reason, it is possible to prevent mistakes in the mounting work of the thermistor 14, and the mounting workability is improved.

  As shown in FIG. 16, the fuse 15 is attached so as to be in direct contact with the outer surface of the accumulator tube F, and has a fuse detector 15a, an asymmetric shape 15b, and a fuse wiring 15d. The fuse detector 15a has a concave shape that is curved so as to follow the curved shape of the outer surface of the accumulator tube F, and has a substantial contact area. Similar to the thermistor 14 described above, the asymmetric shape 15b is inserted upward in FIG. 16, but is asymmetric when viewed from the insertion direction, like the fuse insertion opening 63d. For this reason, it is possible to prevent mistakes in the mounting operation of the fuse 15, and the mounting workability is improved. The fuse wiring 15d is also connected to the control unit 11 in a tied manner. Then, when the fuse 15 detects a temperature exceeding the predetermined temperature, the control unit 11 is caused to start control for stopping the power supply to the coil 68.

<1-4> Internal Structure of Outdoor Unit 2 FIG. 18 is an overall front perspective view showing the internal structure of the machine room of the outdoor unit 2. In FIG. 19, the whole rear perspective view which shows the internal structure of the outdoor unit 2 is shown. In FIG. 20, the perspective view which shows the internal structure of the machine room of the outdoor unit 2 is shown. FIG. 21 shows a right side view of the internal structure of the machine room of the outdoor unit 2. FIG. 23 shows a rear view of the machine room of the outdoor unit 2.

  As shown in FIGS. 18 and 19, the outdoor unit 2 includes a blower chamber in which an outdoor heat exchanger 23, an outdoor fan 26, and the like are disposed, an electromagnetic induction heating unit 6, a compressor 21, an accumulator 25, and the like. It has a partition plate 2h extending from the upper end to the lower end from the front to the rear so as to divide the machine room. The outdoor unit 2 is fixed by being screwed to the bottom plate 2b, and has an outdoor unit support 2g that forms the lowermost end portion of the outdoor unit 2 on the right side and the left side.

  The compressor 21 and the accumulator 25 are disposed in a space below the machine room of the outdoor unit 2. The electromagnetic induction heating unit 6, the four-way switching valve 22, and the outdoor control unit 12 are disposed in a space above the machine room of the outdoor unit 2 and above the compressor 21, the accumulator 25, and the like. .

  As shown in FIGS. 21, 22, and 23, the compressor 21, the four-way switching valve 22, the outdoor heat exchanger 23, and the outdoor electric expansion that are functional elements constituting the outdoor unit 2 and are disposed in the machine room. The valve 24, the accumulator 25, the hot gas bypass valve 27, the capillary tube 28, and the electromagnetic induction heating unit 6 include a discharge pipe A, an indoor side gas pipe B, an outdoor liquid so as to realize the refrigerant circuit 10 shown in FIG. They are connected via a pipe D, an outdoor gas pipe E, an accumulator pipe F, a hot gas bypass circuit H, and the like.

  Here, as will be described later, the hot gas bypass circuit H is configured by connecting nine parts of the first bypass part H1 to the ninth bypass part H9, and when the refrigerant flows into the hot gas bypass circuit H, , Flows in the direction from the first bypass portion H1 toward the ninth bypass portion H9 in order.

  The outdoor electric expansion valve 24, the hot gas bypass valve 27, and the ninth bypass portion H9 of the hot gas bypass circuit H are fixed to a connecting member 29 as one member, and constitute an integrated ASSY. Yes.

  As shown in FIGS. 21, 22, 23, and 1, the outdoor liquid pipe D extending from the outdoor heat exchanger 23 to the outdoor electric expansion valve 24 is connected to the hot gas bypass circuit H at a branch point D1. Have joined. And the refrigerant | coolant merged at the branch point D1 reaches the outdoor electric expansion valve 24 by flowing upwards. Here, a portion of the outdoor liquid pipe D extending from the outdoor heat exchanger 23 immediately before reaching the branch point D1 is held by the pipe winding tool 29a. The pipe wrapping tool 29a is screwed to the connecting member 29 via a screw 29x. Further, in the ninth bypass portion H9 of the hot gas bypass circuit H, the vicinity of the boundary portion with the capillary tube 28 is held by the pipe winding tool 29c. The pipe wrapping tool 29c is also screwed to the connecting member 29 via a screw 29z. The hot gas bypass valve 27 is held by a bypass valve fixture 29b. The bypass valve fixing tool 29b is also screwed to the connecting member 29 via a screw 29y. Thus, the portion of the outdoor liquid pipe D immediately before reaching the branch point D1, the vicinity of the boundary portion of the ninth bypass portion H9 with the capillary tube 28, and the hot gas bypass valve 27 are connected to the connecting member 29. The outdoor electric expansion valve 24, the ninth bypass portion H9, and the hot gas bypass valve 27 connected to the branch point D1 via the outdoor liquid pipe D are ASSY.

  Since the hot gas bypass circuit H is connected to the outdoor liquid pipe D via the capillary tube 28, the hot gas bypass circuit H can be brought close to the pressure after the refrigerant pressure is reduced by the outdoor electric expansion valve 24 during the heating operation. For this reason, the extent to which the refrigerant pressure flowing through the outdoor liquid pipe D increases due to the supply of hot gas to the outdoor liquid pipe D through the hot gas bypass circuit H can be suppressed.

<1-5> Structure near the bottom plate of the outdoor unit 2 FIG. 24 is a perspective view of the bottom plate of the outdoor unit 2 and the outdoor heat exchanger. In FIG. 25, the top view in the state which removed the ventilation mechanism of the outdoor unit 2 is shown. FIG. 26 is a plan view of the bottom plate of the outdoor unit 2.

  As described above, the cross-sectional area of the merging pipe J has an area corresponding to the cross-sectional area of each of the first branch pipe K1, the second branch pipe K2, and the third branch pipe K3. For this reason, in the outdoor heat exchanger 23, the heat exchange effective surface area can be increased more than the junction pipe J in the first branch pipe K 1, the second branch pipe K 2, and the third branch pipe K 3. In addition, since a large amount of refrigerant flows in the merging pipe J in a concentrated manner as compared with the first branch pipe K1, the second branch pipe K2, and the third branch pipe K3, the outdoor heat Ice growth under the exchanger 23 can be more effectively suppressed.

  The junction pipe J can unify the degree of supercooling of the refrigerant flowing out of the outdoor heat exchanger 23 during the cooling operation, and can defrost frosted ice near the lower end of the outdoor heat exchanger 23 during the heating operation. . Here, as shown in FIG. 24, the joining pipe J is configured by connecting the first joining pipe part J1, the second joining pipe part J2, the third joining pipe part J3, and the fourth joining pipe part J4 to each other. Has been. And the refrigerant | coolant which flowed through the branch piping K among the outdoor heat exchangers 23 is merged in the merge branch point 23j, and the flow of the refrigerant in the refrigerant circuit 10 is put together into one, and the outdoor heat exchanger 23 It arrange | positions so that the lowest end part may reciprocate once. Here, the first merging pipe portion J1 extends from the merging branch point 23j to the heat exchange fins 23z disposed at the outermost edge portion of the outdoor heat exchanger 23. The second joining pipe portion J2 extends from the end of the first joining pipe portion J1 so as to penetrate the plurality of heat exchange fins 23z. Moreover, the 4th junction piping part J4 is extended so that the several heat exchanger fin 23z may be penetrated similarly to the 2nd junction piping part J2. The third joining pipe portion J3 is a U-shaped pipe that connects the second joining pipe portion J2 and the fourth joining pipe portion J4 at the end of the outdoor heat exchanger 23.

  During the cooling operation, the refrigerant flow in the refrigerant circuit 10 is divided into a plurality of flows in the branch pipe K by the merge pipe J. Therefore, even if the merge branch point 23j of the refrigerant flowing through the branch pipe K is Even if the degree of supercooling in the immediately preceding portion is different for each refrigerant flowing through the individual pipes constituting the branch pipe K, the refrigerant flow can be made one in the junction pipe J, so that the supercooling at the outlet of the outdoor heat exchanger 23 The degree can be adjusted. When the defrosting operation is performed during the heating operation, the hot gas bypass valve 27 is opened, and the high-temperature refrigerant discharged from the compressor 21 is placed outside the outdoor heat exchanger 23 before the outdoor part. It can be supplied to the junction pipe J provided at the lower end of the heat exchanger 23. For this reason, ice that has formed frost in the vicinity of the lower part of the outdoor heat exchanger 23 can be effectively thawed.

  As shown in FIGS. 24 and 25, the hot gas bypass circuit H has a first bypass portion H1 to an eighth bypass portion H8. Here, the hot gas bypass circuit H branches from the discharge pipe A at the branch point A1 and extends to the hot gas bypass valve 27, and a portion further extending from the hot gas bypass valve 27 is the first bypass portion H1. The second bypass portion H2 extends from the end of the first bypass portion H1 to the blower chamber side in the vicinity of the back surface side. The third bypass portion H3 extends from the end of the second bypass portion H2 toward the front side. The fourth bypass portion H4 extends from the end of the third bypass portion H3 toward the left side that is the opposite side to the machine room side. The fifth bypass portion H5 extends from the end of the fourth bypass portion H4 toward the back side to a portion where a space can be ensured between the back panel 2e of the outdoor unit casing. The sixth bypass portion H6 extends from the end of the fifth bypass portion H5 to the right side that is the machine room side and toward the back side. The seventh bypass portion H7 extends from the end of the sixth bypass portion H6 toward the right side, which is the machine room side, in the blower chamber. The eighth bypass portion H8 extends in the machine room from the end of the seventh bypass portion H7. The ninth bypass portion H9 extends from the end of the eighth bypass portion H8 to the capillary tube 28.

  As described above, the hot gas bypass circuit H causes the refrigerant to flow in order from the first bypass portion H1 toward the ninth bypass portion H9 with the hot gas bypass valve 27 opened. For this reason, the refrigerant branched at the branch point A1 of the discharge pipe A extending from the compressor 21 flows on the first bypass portion H1 side before the refrigerant flowing through the ninth bypass portion H9. For this reason, when the refrigerant flowing through the hot gas bypass circuit H is viewed as a whole, the refrigerant after flowing through the fourth bypass portion H4 flows into the fifth to eighth bypass portions H8, and the fourth bypass portion H4. Is more likely to be higher than the refrigerant temperature flowing through the fifth to eighth bypass portions H8.

(Bottom plate 2b of the outdoor unit 2)
In FIG. 26, the top view of the baseplate 2b of the outdoor unit 2 is shown. FIG. 27 shows a front view of the bottom plate 2b of the outdoor unit. FIG. 28 shows a rear view of the bottom plate 2 b of the outdoor unit 2. FIG. 29 shows a left side view of the bottom plate 2 b of the outdoor unit 2. FIG. 30 is a right side view of the bottom plate 2b of the outdoor unit.

  The bottom plate 2b has a bottom plate front surface portion 81, a bottom plate back surface portion 82, a bottom plate left side surface portion 83, and a bottom plate right side surface portion 84 that extend from a bottom plate main body 80 spreading in a substantially horizontal direction. The bottom plate front portion 81 slightly extends vertically upward from the front side end of the bottom plate main body 80, and has a plurality of screw holes 81a penetrating in the thickness direction so as to be screwed with the lower end of the front panel 2c. Yes. The bottom plate back surface portion 82 extends slightly vertically upward from the back surface side end portion of the bottom plate main body 80, and has a plurality of screw holes 82a penetrating in the thickness direction so as to be screwed with the lower end of the back panel 2e. Yes. The bottom plate left side 83 extends slightly upward from the left side end of the bottom plate body 80 and has a plurality of screw holes 83a penetrating in the thickness direction so as to be screwed with the lower end of the left side panel 2d. doing. The bottom plate right side surface portion 84 extends slightly upward from the right side surface side end portion of the bottom plate main body 80 and has a plurality of screw holes 84a penetrating in the thickness direction so as to be screwed with the lower end of the right side panel 2f. doing.

  The bottom plate main body 80 has a bottom portion 85 that is recessed in the vertical direction so as to be positioned at the lowermost end in the vertical direction.

(Unevenness and opening shape of bottom plate 2b)
FIG. 31 is a cross-sectional view taken along the line BB in FIG. FIG. 32 is a sectional view taken along the line CC in FIG. FIG. 33 is a sectional view taken along the line DD in FIG. FIG. 34 shows a configuration diagram in the vicinity of the NN cross section in FIG.

  The bottom plate main body 80 has a drainage groove 88 that is formed to be recessed vertically downward slightly from the surroundings in order to drain drain water, rainwater, and the like falling from the outdoor fan 26 and the outdoor heat exchanger 23. Yes. The drainage groove portion 88 mainly has a fan blade lower portion 88A located below the outdoor fan 26 and an outdoor heat exchange lower portion 88B located below the outdoor heat exchanger 23. The groove formed in the bottom plate main body 80 has a deepest portion having a depth of 10 mm.

  The lower portion 88A of the fan blade extends from the vicinity of the lower end where the partition plate 2h is located toward the left side opposite to the machine room to the vicinity of the left side surface portion 83 of the bottom plate. The fan blade lower portion 88A is provided at a position projected downward from a position where the portion of the blade portion of the outdoor fan 26 farthest from the rotation shaft passes. The outdoor fan 26 tends to increase the distance from the rotary shaft to the tip of the blade in order to increase the air volume. For this reason, the part of the blades of the outdoor fan 26 that is farthest from the rotation axis tends to pass near the upper surface of the bottom plate 2b in the installed state. For this reason, it is preferable not to grow ice in the area below the part which the blade | wing passes among the baseplate main bodies 80. FIG. The fan blade lower portion 88A is inclined as a high portion 88a in the vicinity of the partition plate 2h, a low portion 88b having a height position lower than the high portion 88a, and a groove connecting the high portion 88a and the low portion 88b. Part 88ab. The inclined portion 88ab is inclined by 1 degree with respect to the horizontal direction so as to rise upward from the left side toward the machine room side as shown in the configuration diagram of the vicinity of the NN cross section in FIG. Thereby, the water which fell to the high part 88a below the outdoor fan 26 flows down to the low part 88b. Moreover, even if the shape of the outdoor fan 26 is increased to the extent that it extends to the vicinity of the bottom plate 2b, it is possible to prevent the blades from being damaged by ice.

  As shown in the DD cross-sectional view of FIG. 33, the outdoor heat exchanger lower portion 88B is provided at a position where the outdoor heat exchanger 23 is projected downward, and includes a front left corner groove portion 88c, a left side groove portion 88d, and a rear surface. It has a left corner groove 88e, a back side groove 88f, and a back machine room side groove 88g. The front left corner groove portion 88c is a groove continuously connected at the same height as the low portion 88b of the fan blade lower portion 88A, and extends from the vicinity of the left end portion toward the back side. The left side groove 88d has the same height as the front left corner groove 88e and further extends to the back side. The back left corner groove 88e has the same height as the left side groove 88d, and extends from the back side end of the left side groove 88d so as to be positioned on the right side toward the back side. The back side groove portion 88f has the same height as the back left side corner groove portion 88e, and further extends toward the right side on the back side near the end portion of the back side left side groove portion 88e. The rear machine room side groove portion 88g has the same height as the back surface side groove portion 88f, and extends further to the right side from the right end portion of the back surface side groove portion 88f to reach the machine chamber side.

  In the left side groove portion 88d, in order to drain water such as drain water, a drain port 86a penetrating in the vertical direction, which is the thickness direction of the bottom plate main body 80, is formed in a lower portion of the groove. The rear left corner groove 88e is formed with a drain port 86b penetrating in the vertical direction, which is the thickness direction of the bottom plate main body 80, in the lower portion of the groove. Drain ports 86c, 86d, and 86e are formed in the rear groove portion 88f so as to penetrate in the vertical direction, which is the thickness direction of the bottom plate main body 80, in the lower portion of the groove.

  In addition, in the bottom plate main body 80, the outer drainage port 87 that penetrates in the vertical direction that is the thickness direction of the bottom plate main body 80 at a position on the rear side of the rear left corner groove portion 88e and on the left side of the rear left corner groove portion 88e. Is formed. Since there is a gap between the outdoor unit casing and the outdoor heat exchanger 23 on the upper surface side of the bottom plate body 80 around the outer drainage port 87, snow or rainwater may enter. That is, as shown in FIG. 5, the left side panel 2d is provided with a plurality of openings for air flow, and the back panel 2e is also provided with a plurality of openings for air flow. Snow or water may accumulate on the upper surface side of the bottom plate body 80 around the outer drainage port 87 through either of them. On the other hand, in this case, in the bottom plate main body 80, on the back side of the rear left corner groove portion 88e and on the left side of the rear left corner groove portion 88e, snow accumulation and water retention do not occur. Water and snow can be discharged through the outer drainage port 87.

  In the portion of the bottom plate main body 80 on the blower chamber side and surrounded by the fan blade lower portion 88A and the outdoor heat exchanger lower portion 88B, as shown in the CC cross-sectional view of FIG. In order to support the outdoor fan 26, a fan base portion 89 is provided so as to protrude upward from the surroundings. The fan base portion 89 includes a first fan base portion 89a that supports the outdoor fan 26 on the machine room side, and a second fan base portion 89b that supports the outdoor fan 26 on the left side with respect to the first fan base portion 89a. doing. In addition, as shown in the BB cross-sectional view of FIG. 31, a first fan back inclined portion 89c is provided on the back side of the first fan base portion 89a. ing. On the back side of the second fan base portion 89b, there is provided a second fan back inclined portion 89d that is inclined so as to be positioned downward toward the back side. Due to the slopes of the first fan back slope part 89c and the second fan back slope part 89d, drain water or the like from the outdoor fan 26 falls to the back side without falling to the fan blade lower part 88A side. Water can be led to the back side and drained.

  As described above, the bottom plate body 80 is formed with the drainage ports 86a to 86e and the outer drainage port 87 that are openings that penetrate in the vertical direction, but with respect to the outdoor heat exchanger lower part 88B in a plan view. In the area on the fan blade lower portion 88A side where the outdoor fan 26 is installed, an opening penetrating in the vertical direction is not formed except for screw holes and the like. For this reason, in a state where the outdoor fan 26 is driven, an air flow that does not pass through the outdoor heat exchanger 23 by passing through a portion located on the outdoor fan 26 side with respect to the outdoor heat exchanger 23 in a plan view (short cut) Flow) is prevented. Further, when water adheres to the bottom of the bottom plate 2b below the outdoor fan 26, there is no opening near the bottom plate 2b, so that freezing is likely to occur. However, hot gas is applied to the bottom of the bottom plate 2b below the outdoor fan 26. Preferential heat supply is performed by the warm refrigerant supplied through the bypass circuit H. Accordingly, it is possible to efficiently suppress the growth of ice below the outdoor fan 26 while improving the passing efficiency of the air flow generated by the outdoor fan 26 to the outdoor heat exchanger 23.

  Further, as described above, the bottom plate body 80 has screw holes or the like in the area on the side where the outdoor fan 26 on the fan blade lower portion 88A side is installed with respect to the outdoor heat exchange lower portion 88B in a plan view. Except for this, there is a possibility that the water will freeze without being drained because the opening penetrating in the vertical direction is not formed. However, here, since the side closer to the branch point A1 in the hot gas bypass circuit H flows under the outdoor fan 26, even if the opening is not provided below the outdoor fan 26, the outdoor fan 26 Can suppress the growth of ice under.

(Shape of hot gas bypass circuit H)
FIG. 35 is a plan view showing the positional relationship between the bottom plate of the outdoor unit 2 and the hot gas bypass circuit H. FIG. 36 shows a front view of the inclined portion below the outdoor fan.

  As described above, the hot gas bypass circuit H is connected to the first bypass portion H1 to the eighth bypass portion H8 on the bottom plate 2b. Here, the boundary portion between the first bypass portion H1 and the second bypass portion H2 is wound around the winding fixture 91a. The winding fixture 91a is screwed to the bottom plate main body 80 by screws 92a. A portion in the vicinity of the boundary between the second bypass portion H2 and the third bypass portion H3 is wound by a winding fixture 91b, and the winding fixture 91b is screwed to the bottom plate main body 80 by a screw 92b.

  A portion in the vicinity of the boundary between the third bypass portion H3 and the fourth bypass portion H4 is wound around a winding fixture 91c, and the winding fixture 91c is screwed to the bottom plate main body 80 by a screw 92c. A portion in the vicinity of the boundary between the fourth bypass portion H4 and the fifth bypass portion H5 is wound around a winding fixture 91d, and the winding fixture 91d is screwed to the bottom plate body 80 by a screw 92d. As a result, any part of the fourth bypass portion H4 has a lowermost end portion of the groove shape portion of the fan blade lower portion 88A and the periphery of the groove shape portion of the fan blade lower portion 88A of the bottom plate body 80 in the front view. The lowermost end portion is located at a height between the upper portion and the higher portion. That is, the fourth bypass portion H4 is disposed so as to be buried in the space of the groove-shaped portion of the fan blade lower portion 88A. Thereby, it can suppress more effectively that ice is formed and grows in the groove part of fan blade lower part 88A.

  A portion in the vicinity of the boundary between the fifth bypass portion H5 and the sixth bypass portion H6 is wound around a winding fixture 91e, and the winding fixture 91e is screwed to the bottom plate main body 80 by a screw 92e. The portion of the seventh bypass portion H7 that is shifted to the left from the center is wound by a winding fixture 91f, and the winding fixture 91f is screwed to the bottom plate main body 80 by a screw 92f. A portion in the vicinity of the boundary between the seventh bypass portion H7 and the eighth bypass portion H8 is wound around a winding fixture 91g, and the winding fixture 91g is screwed to the bottom plate body 80 by a screw 92g. As a result, any of the fifth bypass portion H5, the sixth bypass portion H6, the seventh bypass portion H7, and the eighth bypass portion H8 is the lowermost end portion of the groove-shaped portion of the outdoor heat exchanger lower portion 88B in the front view. And the lowermost end part is located in the height between the periphery of the groove-shaped part of the outdoor heat exchanger lower part 88B in the bottom plate main body 80. That is, the fifth bypass portion H5, the sixth bypass portion H6, the seventh bypass portion H7, and the eighth bypass portion H8 are arranged so as to be buried in the groove-shaped portion of the outdoor heat exchange lower portion 88B. Yes. Thereby, it can suppress more effectively that ice is formed and grows in the groove part of outdoor heat exchanger lower part 88B. Here, the clearance between the fifth bypass portion H5, the sixth bypass portion H6, the seventh bypass portion H7 and the eighth bypass portion H8 of the hot gas bypass circuit H and the lower end portion of the outdoor heat exchanger 23 is about 2.6 mm. The gap is provided.

  In addition, the 5th bypass part H5 of the hot gas bypass circuit H has passed near the vertically upper direction of the drain port 86a. For this reason, the drain port 86a itself can be prevented from being blocked by freezing. Similarly, the sixth bypass portion H6 of the hot gas bypass circuit H passes near the drain port 86b vertically above. For this reason, the drain port 86b itself can be prevented from being blocked by freezing. Further, the seventh bypass portion H7 of the hot gas bypass circuit H passes near the vertically upper side of the drain ports 86c, 86d, 86e. Therefore, the drain ports 86c, 86d, 86e themselves can be prevented from being blocked by freezing.

  As shown in FIG. 36, in the bottom plate 2b, the fourth bypass portion H4 disposed on the inclined portion 88ab of the fan blade lower portion 88A is inclined in parallel with the inclination of the inclined portion 88ab of the fan blade lower portion 88A. Are arranged. And the lower end part of 4th bypass part H4 is arrange | positioned so that it may be buried in the groove-shaped part of 88 A of fan blade lower parts. This prevents the ice from growing vertically below the blade portion of the outdoor fan 26 and also prevents the ice from growing in the groove portion of the fan blade lower portion 88A. Water in the vicinity can be drained more effectively. And in this 4th bypass part H4, when a defrost operation is performed at the time of heating operation, a refrigerant with a high temperature which is discharged from compressor 21 before flowing into outdoor heat exchange lower part 88B, and is not cooled very much, It is supplied with priority over the outdoor heat exchanger lower part 88B. For this reason, even if ice is formed vertically below the blade portion of the outdoor fan 26, the ice can be thawed more effectively by opening the hot gas bypass valve 27. Further, since the water generated by thawing in this manner is effectively drained by the inclined portion 88ab, it is possible to effectively prevent re-freezing under the blade portion of the outdoor fan 26. Accordingly, it is possible to avoid a state in which the blade portion of the outdoor fan 26 is damaged due to the formation of ice on the upper surface of the bottom plate main body 80 or the state where the rotation is not driven.

  Here, the portion of each hot gas bypass circuit H fixed by the screw floats vertically upward from the upper surface side of the bottom plate 2b by about 1 mm in a fixed state.

  The defrost operation described above does not temporarily switch the connection state of the four-way switching valve 22 from the heating operation connection state to the cooling operation connection state, but the four-way switching valve 22 is connected to the discharge side of the compressor 21 and the room. In the heating operation state in which the heat exchanger 41 is connected, the hot gas bypass valve 27 is opened while the connection state of the four-way switching valve 22 is maintained. .

<Characteristics of the air conditioner 1 of the present embodiment>
In the air conditioner 1 of the present embodiment, depending on the environment of the place where the outdoor unit 2 is installed, the upper side of the bottom plate 2b may get wet by rain water or drain water generated in the outdoor heat exchanger 23.

  However, in the air conditioner 1 of the present embodiment, the hot gas bypass circuit H is provided so as to pass through the vicinity of the lower part of the outdoor fan 26 and the lower part of the outdoor heat exchanger 23 in the bottom plate 2b of the outdoor unit casing. ing. For this reason, without using a separate heat source such as a heater, the vicinity of the portion through which the hot gas bypass circuit H passes can be warmed by the high-temperature refrigerant branched and supplied from the discharge pipe A of the compressor 21. Therefore, even if the upper side of the bottom plate 2b gets wet, it is possible to prevent the ice from growing below the outdoor fan 26 and below the outdoor heat exchanger 23 in the bottom plate 2b. As a result, it is possible to avoid a situation where the driving of the outdoor fan 26 is hindered by ice or a situation where the surface of the outdoor heat exchanger 23 is covered with ice and the heat exchange efficiency is reduced.

  Further, the hot gas bypass circuit H is arranged so as to pass under the outdoor fan 26 after branching at the branch point A1 of the discharge pipe A and before passing under the outdoor heat exchanger 23. For this reason, it is possible to prevent the growth of ice below the outdoor fan 26 more preferentially.

<Other embodiments>
As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, about the defrost operation, in the heating operation state in which the four-way switching valve 22 is connected to connect the discharge side of the compressor 21 and the indoor heat exchanger 41, this four-way switching valve 22 The operation in which the hot gas bypass valve 27 is opened while the connection state is maintained is described as an example.

  However, the present invention is not limited to this.

  For example, the defrost operation may be an operation that temporarily switches the connection state of the four-way switching valve 22 from the heating operation connection state to the cooling operation connection state. In this case, when the heating operation connection state is temporarily switched to the cooling operation connection state, the refrigerant discharged from the compressor 21 passes through the fan blade lower portion 88A before the outdoor heat exchange lower portion 88B. As described above, a refrigerant circuit having a switching mechanism is used.

(B)
In the above-described embodiment, the refrigerant circuit 10 in which the hot gas bypass circuit H bypasses the branch point A1 of the discharge pipe A and the branch point D1 of the outdoor liquid pipe D has been described as an example.

  However, the present invention is not limited to this.

  As shown in FIG. 37, for example, the refrigerant circuit 210 having the hot gas bypass circuit Ha provided so as to bypass the branch point A1 of the discharge pipe A and the branch point C1 of the indoor liquid pipe C is provided. The air conditioner 201 may be used. Even in this case, the hot gas bypass circuit Ha can be provided so as to pass under the outdoor fan 26 first and pass under the outdoor heat exchanger 23 later.

(C)
In the said embodiment, the hot gas bypass circuit H which passes the upper direction of the drain ports 86a-86e provided in the baseplate main body 80 gave and demonstrated the case where all were extended and arrange | positioned.

  However, the present invention is not limited to this.

  As shown in FIG. 38, for example, the sixth bypass portion H6 that passes above the drain port 86b in the hot gas bypass circuit Hb is inclined and disposed so that the lowermost end is positioned on the drain port 86b. May be.

  Further, the present invention is not limited to the combination of the drain port 86b and the sixth bypass portion H6, and the hot gas bypass circuit Hb may have an inclined portion so that the portion passing above the drain ports 86a to 86e becomes the lower end. Good.

  Thereby, the water flowing along the lower end of the pipe of the hot gas bypass circuit Hb is guided to the vicinity of the upper portion of the drain ports 86a to 86e by the inclination, and the drainage effect can be improved.

  If the present invention is used, since it is possible to suppress the growth of ice on the bottom plate of the outdoor unit without using a configuration other than the refrigeration cycle such as a heater, electromagnetic induction heating that heats the refrigerant using electromagnetic induction is possible. Particularly useful in units and air conditioners.

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 2 Outdoor unit 2a-2e Outdoor unit casing (casing)
2b Bottom plate 6 Electromagnetic induction heating unit 10 Refrigerant circuit 11 Control unit (switching control unit)
21 Compressor (compression mechanism)
22 Four-way selector valve (connection selector valve)
23 Outdoor heat exchanger (heat source side heat exchanger)
23d Liquid side inlet / outlet (expansion mechanism side outlet)
23e Gas side entrance (compression mechanism passage)
23j Junction branch point (second branch point)
23k Branch and junction (first branch point)
23z Heat exchange fin (fin)
24 Electric expansion valve 25 Accumulator 26 Outdoor fan (blower)
27 Hot gas bypass valve (bypass switching part)
28 Capillary tube (pressure reduction mechanism)
41 Indoor heat exchanger 61 1st hexagon nut (positioning part)
62 C-shaped ring (positioning part)
63 1st bobbin lid (positioning part)
64 2nd bobbin lid 65 Bobbin body 66 2nd hexagon nut 68 Coil 71 1st ferrite case 72 2nd ferrite case 73 3rd ferrite case 74 4th ferrite case 75 Shielding cover 86a-86e Drain port (groove opening)
87 Outer drain port 88A Fan blade lower part (bypass groove)
88B Outdoor heat exchange lower part (bypass groove)
98 1st ferrite 99 2nd ferrite A Discharge pipe, refrigerant piping (third refrigerant piping)
B Indoor side gas pipe, refrigerant pipe C Indoor side liquid pipe (first refrigerant pipe)
D Outdoor liquid pipe (second refrigerant pipe)
E Outdoor gas pipe, refrigerant pipe F Accumulation pipe, refrigerant pipe G Suction pipe, refrigerant pipe H Hot gas bypass circuit J Merge pipe (thermal AC path, merge pipe)
K branch piping (thermal AC path )
K1 First branch pipe (first branch pipe)
K2 Second branch pipe (second branch pipe)
K3 3rd branch piping

Claims (12)

An air conditioner (1) having a compression mechanism (21), a heat source side heat exchanger (23), an expansion mechanism (24) and a use side heat exchanger (41),
A blower (26) for supplying an air flow to the heat source side heat exchanger (23);
A housing (2a to 2e) having a bottom plate (2b), housing the heat source side heat exchanger (23) and the blower (26) in a space above the bottom plate (2b);
The first refrigerant pipe (C) extending from the use side heat exchanger (41) to the expansion mechanism (24) or the expansion mechanism (24) to the heat source side heat exchanger (23). At least one of the second refrigerant pipe (D) and the third refrigerant pipe (A) on the discharge side of the compression mechanism (21), and vertically below the blower (26) and A bypass circuit (H) arranged to pass vertically below the heat source side heat exchanger (23) ;
With
The bypass circuit (H) passes from the third refrigerant pipe (A) vertically below the blower (26) and then passes vertically below the heat source side heat exchanger (23) to pass through the first refrigerant pipe. (C) or at least one of the second refrigerant pipes (D),
The heat source side heat exchanger (23) includes a compression mechanism side passage port (23e) which is a refrigerant passage port on the compression mechanism (21) side and an expansion mechanism side which is a refrigerant passage port on the expansion mechanism (24) side. Heat extending so as to allow heat exchange between the passage port (23d) and the refrigerant passing between the compression mechanism passage port (23e) and the expansion mechanism passage port (23d) and an external fluid. And an AC path (K, J)
The heat exchange path (K, J)
A first branch point (23k);
A second branch point (23j) provided closer to the expansion mechanism side passage port (23d) than the first branch point (23k);
A first branch pipe (K1) and a second branch pipe (K2) that connect the first branch point (23k) and the second branch point (23j) by independent paths;
The second branch point (23j) and the expansion mechanism side passage port (23d) are connected, and pass under the at least one of the first branch pipe (K1) and the second branch pipe (K2). A junction pipe (J) communicating with both the first branch pipe (K1) and the second branch pipe (K2);
A has,
The junction pipe (J) passes vertically above the bypass circuit (H),
Air conditioner (1). The bottom plate (2b) does not have an opening penetrating in the plate thickness direction in a portion located on the blower (26) side with respect to the heat source side heat exchanger (23) in a plan view.
The air conditioner (1) according to claim 1. The bottom plate (2b) has drainage ports (86a to 86e) penetrating in the thickness direction below the heat source side heat exchanger (23).
The air conditioner (1) according to claim 1 or 2. The heat source side heat exchanger (23) further includes fins (23z),
The fin (23z) penetrates at least one of the first branch pipe (K1) and the second branch pipe (K2) and the junction pipe (J), and the first branch pipe (K1) ) And at least one penetrating part of the second branch pipe (K2) and the penetrating part of the junction pipe (J) are connected,
The air conditioner (1) according to any one of claims 1 to 3. The bottom plate (2) has bypass grooves (88A, 88B) formed so that at least part of the vicinity of the passage portion of the bypass circuit (H) sinks downward,
At least a part of the bypass circuit (H) is disposed in a space lower than the periphery of the bypass groove on the upper surface side of the bypass groove (88A, 88B).
The air conditioner (1) according to any one of claims 1 to 4. The bypass groove (88A, 88B) has an inclined portion,
The bottom plate (2b) has groove openings (86a to 86e) penetrating in the plate thickness direction in the vicinity of the lower end of the inclined portion of the bypass groove (88A, 88B).
The air conditioner (1) according to claim 5. The bypass circuit (H) has an inclined portion so that a portion passing above the groove openings (86a to 86e) becomes a lower end.
The air conditioner (1) according to claim 6. At least a part of a portion of the bypass circuit (H) that passes through a vertically lower portion of the heat source side heat exchanger (23) is located above the groove openings (86a to 86e).
The air conditioner (1) according to claim 6 or 7. A connection switching valve (22) connected to the end of the third refrigerant pipe (A) opposite to the compression mechanism (21) side;
The connection switching valve (22) includes a first connection state that guides the refrigerant discharged from the compression mechanism (21) to the use-side heat exchanger (41), and refrigerant discharged from the compression mechanism (21). Can be switched between the second connection state leading to the heat source side heat exchanger (23) side,
The air conditioner (1) according to any one of claims 1 to 8. The bypass circuit (H) has a pressure reducing mechanism (28) for reducing the pressure of the refrigerant passing therethrough, and extends from the expansion mechanism (24) to the heat source side heat exchanger (23). 2 bypassing the refrigerant pipe (D) and the third refrigerant pipe (A) on the discharge side of the compression mechanism (21),
The air conditioner (1) according to any one of claims 1 to 9. A bypass switching unit (27) capable of switching between a state allowing the refrigerant flow in the bypass circuit (H) and a state not permitting the refrigerant flow;
The air conditioner (1) according to any one of claims 1 to 10. Switching control for switching the state of the bypass switching unit (27) to a state allowing the refrigerant flow in the bypass circuit (H) when performing a defrost operation to remove frost adhering to the heat source side heat exchanger (23). Further comprising a section (11),
The air conditioner (1) according to claim 11.

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