WO2012086746A1

WO2012086746A1 - Flow path switching valve and air conditioner with same

Info

Publication number: WO2012086746A1
Application number: PCT/JP2011/079784
Authority: WO
Inventors: 知厚南田; 洋一大沼; 菊池　芳正; 昌昭北澤
Original assignee: ダイキン工業株式会社
Priority date: 2010-12-24
Filing date: 2011-12-22
Publication date: 2012-06-28
Also published as: JP2012145318A

Abstract

Provided is an air conditioner performing dehumidification operation even if cooling operation is performed using a reduced amount of refrigerant circulation. When a flow path switching valve (51) is disposed at the inlet or the outlet of an evaporator for cooling having paths through which the refrigerant flows, if a first mode by a first path (21) is set, cooling can be performed using the entire evaporator, and if a second mode or a third mode is set, cooling can be performed by a portion of the evaporator by causing the refrigerant to flow to some of the paths. Accordingly, in the air conditioner provided with the flow path switching valve (51), when a control unit (8) switches the flow path switching valve (51) to the second mode in order to perform cooling operation, the refrigerant can flow only to a first indoor heat exchanger (40a) and a second indoor heat exchanger (40b), and as a result, only a portion of the indoor heat exchanger (40) serves as the evaporator. Accordingly, the use capacity of the indoor heat exchanger (40) is reduced. When the capacity of the indoor heat exchanger (40) is reduced without a change in the amount of air supply to the indoor heat exchanger (40), sucked air is dehumidified without a large amount of sensible heat being drawn from the sucked air.

Description

Flow path switching valve and air conditioner equipped with the same

The present invention relates to a flow path switching valve that switches a fluid flow path or distributes fluid in multiple directions.

In the cooling operation of an air conditioner equipped with a variable capacity compressor, the capacity of the air conditioner may be small when the air conditioning load is small. Preferably it is controlled. However, when operated with a small amount of refrigerant circulation, the refrigerant entering the indoor heat exchanger evaporates immediately and its evaporation temperature does not reach the dew point temperature of the intake air, so the sensible heat of the intake air is deprived but the latent heat is Not deprived and dehumidified. In order to overcome such problems, in the air conditioner disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-148830), the indoor heat exchanger is adapted to the size of the cooling load and the dehumidifying load. The quantity of the heat exchange parts that function as an evaporator is selected from the plurality of heat exchange parts.

However, the air conditioner described in Patent Document 1 requires at least an on-off valve and an expansion valve between the heat exchange units in order to select a heat exchange unit that functions as an evaporator, which causes an increase in cost. ing.
The subject of this invention is providing the flow-path switching valve which implement | achieves the air conditioner in which dehumidification is performed at low cost, even when cooling operation is carried out with a small refrigerant | coolant circulation amount.

A flow path switching valve according to a first aspect of the present invention is a flow path switching valve that switches a path through which a fluid flows, and a movable body that communicates a main body having a plurality of inlets and outlets with an inlet and an outlet. With body. The plurality of inlets includes at least a first inlet and a second inlet. The plurality of outlets include at least a first outlet and a second outlet. The movable body forms a first valve mechanism portion and a second valve mechanism portion inside the main body. The first valve mechanism opens and closes the first inlet and / or the second inlet. The second valve mechanism portion opens and closes the first outlet and / or the second outlet. Further, the movable body performs switching to either the first form or the second form. The first form is a form in which the fluid is introduced from the first inlet and the second inlet into the first valve mechanism and then guided from the second valve mechanism to the first outlet and the second outlet. The second form is a form in which the fluid is introduced only from the first inflow port into the first valve mechanism unit and then guided from the second valve mechanism unit only to the first outflow port.

In this flow path switching valve, for example, when the flow path switching valve is arranged at the inlet or outlet of the cooling evaporator having a plurality of paths through which the refrigerant flows, in the first embodiment, the entire evaporator can be cooled, In the second mode, it is possible to perform cooling as an evaporator by flowing the refrigerant only in a part of the paths.

The flow path switching valve according to the second aspect of the present invention is the flow path switching valve according to the first aspect, and the movable body has a first passage and a second passage. The first passage allows the first valve mechanism and the second valve mechanism to communicate with each other. The second passage allows the first valve mechanism portion and the second valve mechanism portion to communicate with each other and has a passage cross-sectional area smaller than that of the first passage. When switching to the first configuration is performed, either the first passage or the second passage is selected.
In this flow path switching valve, for example, when the flow path switching valve is disposed between two serially arranged paths through which the refrigerant flows, the flow path switching valve is switched to the first form using the second passage, The upstream path of the flow path switching valve can be used as a condenser, and the downstream path can be used as an evaporator.

The flow path switching valve according to the third aspect of the present invention is the flow path switching valve according to the second aspect, and in the first mode in which the first passage is selected, the flow path switching valve enters from the first inlet and the second inlet. The fluids merged in the first passage.
In this flow path switching valve, for example, when the path through which the refrigerant flows is connected to each of the first inlet and the second inlet, and the path through which the refrigerant flows is connected to each of the first outlet and the second outlet, The refrigerant flowing in from the first inlet and the second inlet once merges in the first passage, and then is divided into the first outlet and the second outlet, respectively.
As a result, even when a drift occurs in the refrigerant flowing from the first inlet and the second inlet, the drift is eliminated in the first passage, and the first outlet and the second outlet are almost evenly distributed. There is an opportunity to be diverted.

The flow path switching valve according to the fourth aspect of the present invention is the switching valve according to the second aspect, and in the first mode in which the second passage is selected, the fluid entered from the first inlet and the second inlet. Merge in the second passage.
In this flow path switching valve, for example, when the path through which the refrigerant flows is connected to each of the first inlet and the second inlet, and the path through which the refrigerant flows is connected to each of the first outlet and the second outlet, The refrigerant flowing in from the first inlet and the second inlet once joins in the second passage and is depressurized, and then is divided into the first outlet and the second outlet, respectively.
As a result, even when a drift occurs in the refrigerant flowing from the first inlet and the second inlet, the drift is eliminated and the pressure is reduced in the second passage, and the first outlet and the second outlet respectively. Will be given the opportunity to be split evenly.

A flow path switching valve according to a fifth aspect of the present invention is a flow path switching valve that switches a path through which a fluid flows, and a movable body that communicates a main body having a plurality of inlets and outlets with an inlet and an outlet. With body. The plurality of inlets includes at least a first inlet and a second inlet. The plurality of outlets include at least a first outlet and a second outlet. The movable body forms a first valve mechanism portion and a second valve mechanism portion inside the main body. The first valve mechanism opens and closes the first inlet. The second valve mechanism portion opens and closes the first outlet and / or the second outlet. Further, the movable body switches to either the first form or the second form. The first form is a form in which the fluid is introduced from only the first inflow port into the first valve mechanism unit and then guided from the second valve mechanism unit to the first outflow port and the second outflow port. The second form is a form in which the fluid is introduced only from the first inflow port into the first valve mechanism unit and then guided from the second valve mechanism unit only to the first outflow port.

The flow path switching valve according to the sixth aspect of the present invention is the flow path switching valve according to the fifth aspect, and the movable body has a first passage and a second passage. The first passage allows the first valve mechanism and the second valve mechanism to communicate with each other. The second passage allows the first valve mechanism portion and the second valve mechanism portion to communicate with each other and has a passage cross-sectional area smaller than that of the first passage. When switching to the first configuration is performed, either the first passage or the second passage is selected.
In this flow path switching valve, for example, when the flow path switching valve is disposed between two serially arranged paths through which the refrigerant flows, the flow path switching valve is switched to the first form using the second passage, The upstream path of the flow path switching valve can be used as a condenser, and the downstream path can be used as an evaporator.

The flow path switching valve according to a seventh aspect of the present invention is the flow path switching valve according to the sixth aspect, wherein the movable body further includes a common space and a third passage. The common space guides the fluid flowing into the second valve mechanism to both the first outlet and the second outlet. The third passage guides the fluid flowing into the first valve mechanism part only to the first outlet. When switching to the first form is performed, either the first passage or the second passage and the common space are selected. The third passage is selected when switching to the second configuration is performed.
In this flow path switching valve, for example, when the path through which the refrigerant flows is connected to the first inlet, and the path through which the refrigerant flows is also connected to each of the first outlet and the second outlet, the flow is switched in from the first inlet. The refrigerant to be diverted from the common space to the first outlet and the second outlet. As a result, the opportunity is given for the refrigerant to be divided into the first outlet and the second outlet almost evenly.

An air conditioner according to an eighth aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a condenser, a decompressor, and an evaporator, And an indoor heat exchanger and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. The indoor heat exchanger includes a first indoor heat exchanger group, a second indoor heat exchanger group, and a flow path switching valve according to any one of the first to fifth aspects. . The first indoor heat exchange part group includes a first indoor heat exchange part and a second indoor heat exchange part connected in parallel with the first indoor heat exchange part. The second indoor heat exchange section group includes a third indoor heat exchange section and a fourth indoor heat exchange section connected in parallel with the third indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. The first indoor heat exchange section is at the first inlet, the second indoor heat exchange section is at the second inlet, the third indoor heat exchange section is at the first outlet, and the fourth indoor heat exchange section is at the second inlet. Connected to the outlet. A control part switches a flow-path switching valve to a 2nd form, when suppressing capability and performing cooling operation.

In this air conditioner, since the control unit switches the flow path switching valve to the second configuration during the cooling operation, for example, the refrigerant can flow only to the first indoor heat exchange unit and the third indoor heat exchange unit. Only a part of the indoor heat exchanger becomes an evaporator. As a result, the capacity of the indoor heat exchanger is reduced and the refrigerant is prevented from immediately evaporating. Further, since the use pressure of the indoor heat exchanger is reduced, the evaporation pressure is lowered and the evaporation temperature is also lowered, so that dehumidification is performed. In particular, when the amount of air blown to the entire indoor heat exchanger does not change and the capacity of the indoor heat exchanger through which the refrigerant flows is reduced, the sucked air is dehumidified without taking much sensible heat.

An air conditioner according to a ninth aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a condenser, a decompressor, and an evaporator, And an indoor heat exchanger and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. The indoor heat exchanger includes a first indoor heat exchange unit group, a second indoor heat exchange unit group, and a flow path switching valve according to any one of the first to seventh aspects. . The first indoor heat exchange section group includes a second indoor heat exchange section. The second indoor heat exchange section group includes a third indoor heat exchange section and a fourth indoor heat exchange section connected in parallel with the third indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. A pipe connecting the decompressor and the indoor heat exchanger and the flow path switching valve are connected by a bypass path. The bypass path is connected to the first inlet, the second indoor heat exchange section is connected to the second inlet, the third indoor heat exchange section is connected to the first outlet, and the fourth indoor heat exchange section is connected to the second outlet. Has been. The control unit switches the flow path switching valve to the second mode when performing cooling operation while suppressing the capacity.

In this air conditioner, the refrigerant that has entered the first inlet from the bypass passage flows from the first outlet to the third heat exchange unit to reduce the capacity of the indoor heat exchanger, whereby the refrigerant evaporates immediately. Is suppressed. Further, since the evaporation pressure is lowered and the evaporation temperature is lowered due to a reduction in the use capacity of the indoor heat exchanger, dehumidification can be achieved. If it does so, since the ventilation volume to the whole indoor heat exchanger does not change and the capacity | capacitance of the indoor heat exchanger which flows a refrigerant | coolant becomes small, the suction | inhalation air is dehumidified, without taking away much sensible heat.

An air conditioner according to a tenth aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a four-way switching valve, a condenser, a decompressor, and an evaporator. And a control unit, an indoor heat exchanger, and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. The indoor heat exchanger includes a first indoor heat exchange unit group, a second indoor heat exchange unit group, and a flow path switching valve according to any one of the first to seventh aspects. . The first indoor heat exchange part group includes a first indoor heat exchange part and a second indoor heat exchange part connected in parallel with the first indoor heat exchange part. The second indoor heat exchange section group includes a fourth indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. The pipe connecting the four-way switching valve and the indoor heat exchanger and the flow path switching valve are connected by a bypass path. The first indoor heat exchange section is connected to the first outlet, the second indoor heat exchange section is connected to the second outlet, the bypass path is connected to the first inlet, and the fourth indoor heat exchange section is connected to the second inlet. Has been. A control part switches a flow-path switching valve to a 2nd form, when suppressing capability and performing cooling operation.

In this air conditioner, the first outlet and the second outlet can be used as the inlet, and the first inlet can be used as the outlet. In addition, the refrigerant that has entered the first outlet from the first indoor heat exchange section is allowed to flow from the first inlet to the bypass passage to reduce the capacity of the indoor heat exchanger, thereby preventing the refrigerant from evaporating immediately. The Furthermore, since the evaporating pressure is lowered and the evaporating temperature is lowered due to a reduction in the use capacity of the indoor heat exchanger, dehumidification can be performed. If it does so, since the ventilation volume to the whole indoor heat exchanger does not change and the capacity | capacitance of the indoor heat exchanger which flows a refrigerant | coolant becomes small, the suction | inhalation air is dehumidified, without taking away much sensible heat.

An air conditioner according to an eleventh aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a condenser, a decompressor, and an evaporator, And an indoor heat exchanger and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. The indoor heat exchanger includes a first indoor heat exchange unit group, a second indoor heat exchange unit group, and a flow path switching valve according to any one of the second to fourth aspects. . The first indoor heat exchange part group includes a first indoor heat exchange part and a second indoor heat exchange part connected in parallel with the first indoor heat exchange part. The second indoor heat exchange section group includes a third indoor heat exchange section and a fourth indoor heat exchange section connected in parallel with the third indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. The first indoor heat exchange section is at the first inlet, the second indoor heat exchange section is at the second inlet, the third indoor heat exchange section is at the first outlet, and the fourth indoor heat exchange section is at the second inlet. Connected to the outlet. The control unit switches the flow path switching valve to the first form using the second passage when performing the reheat dehumidifying operation.

In this air conditioner, the control unit switches the flow path switching valve to the first form using the second passage, whereby the refrigerant is decompressed, the first indoor heat exchange unit group becomes a condenser, and the second indoor The heat exchange unit group becomes an evaporator. That is, the flow path switching valve also has a function as an expansion valve during the reheat dehumidification operation.

An air conditioner according to a twelfth aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a condenser, a decompressor, and an evaporator, And an indoor heat exchanger and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. Moreover, the indoor heat exchanger has a first indoor heat exchange section group, a second indoor heat exchange section group, and a flow path switching valve according to the sixth aspect or the seventh aspect. The first indoor heat exchange unit group includes a first indoor heat exchange unit. The second indoor heat exchange section group includes a third indoor heat exchange section and a fourth indoor heat exchange section connected in parallel with the third indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. A pipe connecting the decompressor and the indoor heat exchanger and the flow path switching valve are connected by a bypass path. The first indoor heat exchange section is connected to the first inlet, the bypass passage is connected to the second inlet, the third indoor heat exchange section is connected to the first outlet, and the fourth indoor heat exchange section is connected to the second outlet. Has been. The control unit switches the flow path switching valve to the first form using the second passage when performing the reheat dehumidifying operation.

An air conditioner according to a thirteenth aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a four-way switching valve, a condenser, a decompressor, and an evaporator. And a control unit, an indoor heat exchanger, and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. Moreover, the indoor heat exchanger has a first indoor heat exchange section group, a second indoor heat exchange section group, and a flow path switching valve according to the sixth aspect or the seventh aspect. The first indoor heat exchange part group includes a first indoor heat exchange part and a second indoor heat exchange part connected in parallel with the first indoor heat exchange part. The second indoor heat exchange section group includes a third indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. The pipe connecting the four-way switching valve and the indoor heat exchanger and the flow path switching valve are connected by a bypass path. The first indoor heat exchange section is connected to the first outlet, the second indoor heat exchange section is connected to the second outlet, the third indoor heat exchange section is connected to the first inlet, and the bypass path is connected to the second inlet. Has been. The control unit switches the flow path switching valve to the first form using the second passage when performing the reheat dehumidifying operation.

In this air conditioner, by using the first outlet and the second outlet as the inlet and using the first inlet as the outlet, the refrigerant from the two condensers is decompressed during the reheat dehumidifying operation. It is possible to make a configuration in which one is sent to the evaporator.

An air conditioner according to a fourteenth aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a condenser, a decompressor, and an evaporator, And an indoor heat exchanger and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. The indoor heat exchanger includes a first indoor heat exchange unit group, a second indoor heat exchange unit group, and a flow path switching valve according to any one of the first to seventh aspects. . The first indoor heat exchange unit group includes a first indoor heat exchange unit. The second indoor heat exchange section group includes a third indoor heat exchange section and a fourth indoor heat exchange section connected in parallel with the third indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. A pipe connecting the decompressor and the indoor heat exchanger and the flow path switching valve are connected by a bypass path. The first indoor heat exchange section is connected to the first inlet, the bypass passage is connected to the second inlet, the third indoor heat exchange section is connected to the first outlet, and the fourth indoor heat exchange section is connected to the second outlet. Has been. A control part switches a flow-path switching valve to a 2nd form, when suppressing capability and performing cooling operation.

An air conditioner according to a fifteenth aspect of the present invention is an air conditioner that uses a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, a four-way switching valve, a condenser, a decompressor, and an evaporator. And a control unit, an indoor heat exchanger, and an outdoor heat exchanger. An indoor heat exchanger becomes a condenser at the time of heating operation, and becomes an evaporator at the time of cooling operation. The outdoor heat exchanger serves as an evaporator during heating operation, and serves as a condenser during cooling operation. The indoor heat exchanger includes a first indoor heat exchange unit group, a second indoor heat exchange unit group, and a flow path switching valve according to any one of the first to seventh aspects. . The first indoor heat exchange part group includes a first indoor heat exchange part and a second indoor heat exchange part connected in parallel with the first indoor heat exchange part. The second indoor heat exchange section group includes a third indoor heat exchange section. The flow path switching valve is disposed between the first indoor heat exchange unit group and the second indoor heat exchange unit group. The pipe connecting the four-way switching valve and the indoor heat exchanger and the flow path switching valve are connected by a bypass path. The first indoor heat exchange section is connected to the first outlet, the second indoor heat exchange section is connected to the second outlet, the third indoor heat exchange section is connected to the first inlet, and the bypass path is connected to the second inlet. Has been. A control part switches a flow-path switching valve to a 2nd form, when suppressing capability and performing cooling operation.

In the flow path switching valve according to the first aspect or the fifth aspect of the present invention, when the flow path switching valve is arranged at the inlet or the outlet of the cooling evaporator having a plurality of paths through which the refrigerant flows, in the first embodiment, the evaporator Cooling can be performed as a whole, and in the second mode, cooling can be performed as an evaporator by flowing a refrigerant only in a part of the paths.
In the flow path switching valve according to the second aspect or the sixth aspect of the present invention, when the flow path switching valve is disposed between two serially arranged paths through which the refrigerant flows, the flow path switching valve uses the second passage. By switching to the first mode, it is possible to use the upstream path of the flow path switching valve as a condenser and the downstream path as an evaporator.
In the flow path switching valve according to the third aspect or the seventh aspect of the present invention, the refrigerant is given an opportunity to be divided approximately equally into the first outlet and the second outlet.

In the flow path switching valve according to the fourth aspect of the present invention, even when a drift occurs in the refrigerant flowing from each of the first inlet and the second inlet, the drift is eliminated and the pressure is reduced in the second passage. An opportunity is given to distribute the flow into the first outlet and the second outlet almost equally.
In the air conditioner according to any one of the eighth aspect, the ninth aspect, and the tenth aspect of the present invention, the use of the indoor heat exchanger is reduced, whereby the refrigerant is prevented from immediately evaporating. Moreover, since the evaporation pressure is lowered and the evaporation temperature is lowered by reducing the use capacity of the indoor heat exchanger, dehumidification can be performed. If it does so, since the ventilation volume to the whole indoor heat exchanger does not change and the capacity | capacitance of the indoor heat exchanger which flows a refrigerant | coolant becomes small, the suction | inhalation air is dehumidified, without taking away much sensible heat.
In the air conditioner according to the eleventh aspect or the twelfth aspect of the present invention, the control unit switches the flow path switching valve to the first form using the second passage, whereby the refrigerant is decompressed and the first indoor heat exchange is performed. The part group becomes a condenser, and the second indoor heat exchange part group becomes an evaporator. That is, the flow path switching valve also has a function as an expansion valve during the reheat dehumidification operation.

In the air conditioner according to the thirteenth aspect of the present invention, two condensers are used during reheat dehumidification operation by using the first outlet and the second outlet as the inlet and the first inlet as the outlet. It is possible to depressurize the refrigerant from the refrigerant and send it to the evaporator in one.
In the air conditioner according to the fourteenth aspect or the fifteenth aspect of the present invention, the refrigerant is prevented from immediately evaporating by reducing the use capacity of the indoor heat exchanger. Moreover, since the evaporation pressure is lowered and the evaporation temperature is lowered by reducing the use capacity of the indoor heat exchanger, dehumidification can be performed. If it does so, since the ventilation volume to the whole indoor heat exchanger does not change and the capacity | capacitance of the indoor heat exchanger which flows a refrigerant | coolant becomes small, the suction | inhalation air is dehumidified, without taking away much sensible heat.

The block diagram of the air conditioner provided with the flow-path switching valve which concerns on 1st Embodiment of this invention. The perspective view of the flow-path switching valve which concerns on 1st Embodiment of this invention. Sectional drawing of a flow-path switching valve when the 1st switching part and 2nd switching part of the flow-path switching valve switched to the 1st form using the 1st channel | path are cut | disconnected by the surface orthogonal to the central axis of a main body. Sectional drawing of a flow-path switching valve when the 1st switching part and 2nd switching part of the flow-path switching valve switched to the 2nd form using the 3rd channel | path are cut | disconnected by the surface orthogonal to the central axis of a main body. Sectional drawing of a flow-path switching valve when the 1st switching part and 2nd switching part of the flow-path switching valve switched to the 3rd form using the 3rd channel | path are cut | disconnected by the surface orthogonal to the central axis of a main body. Sectional drawing of a flow-path switching valve when the 1st switching part and 2nd switching part of the flow-path switching valve switched to the 1st form using a 2nd channel | path are cut | disconnected by the surface orthogonal to the central axis of a main body. The refrigerant | coolant route map of the flow-path switching valve switched to the 1st form using the 1st channel | path. The refrigerant | coolant route map of the flow-path switching valve switched to the 2nd form using the 3rd channel | path. The refrigerant | coolant route map of the flow-path switching valve switched to the 3rd form using the 3rd channel | path. The refrigerant | coolant route map of the flow-path switching valve switched to the 1st form using the 2nd channel | path. A flow path switching valve according to a modification of the first embodiment, wherein the first switching section and the second switching section of the flow path switching valve switched to the first form using the first passage are the central axis of the main body. Sectional drawing of a flow-path switching valve when cut | disconnecting on the surface which orthogonally crosses. A flow path switching valve according to a modification of the first embodiment, wherein the first switching section and the second switching section of the flow path switching valve switched to the second form using the third passage are the central axis of the main body. Sectional drawing of a flow-path switching valve when cut | disconnecting on the surface which orthogonally crosses. A flow path switching valve according to a modification of the first embodiment, wherein the first switching section and the second switching section of the flow path switching valve switched to the first form using the second passage are the central axis of the main body. Sectional drawing of a flow-path switching valve when cut | disconnecting on the surface which orthogonally crosses. The block diagram of the air conditioner provided with the flow-path switching valve which concerns on 2nd Embodiment. The block diagram of the 2nd air conditioner provided with the flow-path switching valve which concerns on 2nd Embodiment. A flow path switching valve according to a second embodiment, wherein the first switching section and the second switching section of the flow path switching valve are switched to the first configuration in which the first passage faces the first pipe connection section. Sectional drawing of a flow-path switching valve when cut | disconnecting in the surface orthogonal to a central axis. In the flow path switching valve according to the second embodiment, the first switching section and the second switching section of the flow path switching valve, wherein the first passage is switched to the first configuration facing the second pipe connection section, are connected to the main body. Sectional drawing of a flow-path switching valve when cut | disconnecting in the surface orthogonal to a central axis. A flow path switching valve according to a second embodiment, wherein the third switching path of the flow path switching valve is switched to a second configuration in which the third passage faces the first pipe connection section and the third pipe connection section, and the second switching section. Sectional drawing of a flow-path switching valve when 2 switching part is cut | disconnected by the surface orthogonal to the central axis of a main body. A flow path switching valve according to a second embodiment, wherein the third switching path of the flow path switching valve is switched to the second mode in which the third passage faces the second pipe connection section and the fourth pipe connection section, and the second switching section. Sectional drawing of a flow-path switching valve when 2 switching part is cut | disconnected by the surface orthogonal to the central axis of a main body. In the flow path switching valve according to the second embodiment, the first switching section and the second switching section of the flow path switching valve, in which the second passage is switched to the first configuration facing the first pipe connection section, are connected to the main body. Sectional drawing of a flow-path switching valve when cut | disconnecting in the surface orthogonal to a central axis. In the flow path switching valve according to the second embodiment, the first switching section and the second switching section of the flow path switching valve, in which the second passage is switched to the first configuration facing the second pipe connection section, are connected to the main body. Sectional drawing of a flow-path switching valve when cut | disconnecting in the surface orthogonal to a central axis. The perspective view of the valve body of the flow-path switching valve concerning 2nd Embodiment. The refrigerant | coolant route map of the flow-path switching valve corresponding to FIG. 7A. The refrigerant | coolant route map of the flow-path switching valve corresponding to FIG. 7B. The refrigerant | coolant route map of the flow-path switching valve corresponding to FIG. 7C. The refrigerant | coolant route map of the flow-path switching valve corresponding to FIG. 7D. The refrigerant | coolant route map of the flow-path switching valve corresponding to FIG. 7E. The refrigerant | coolant route map of the flow-path switching valve corresponding to FIG. 7F. The block diagram of the 3rd air conditioner provided with the flow-path switching valve which concerns on 2nd Embodiment. The block diagram of the 4th air conditioner provided with the flow-path switching valve which concerns on 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.
<First Embodiment>
(1) Configuration of Air Conditioner FIG. 1 is a configuration diagram of an air conditioner including a flow path switching valve according to the first embodiment of the present invention. In FIG. 1, in the air conditioner, an outdoor unit 6 and an indoor unit 4 are connected by a refrigerant communication pipe to form a vapor compression refrigerant circuit.
(1-1) Outdoor unit 6
The outdoor unit 6 is mainly installed outdoors, and includes a four-way switching valve 2, a compressor 5, an expansion valve 7, and an outdoor heat exchanger 46.

The four-way switching valve 2 is a valve that switches the direction of the refrigerant flow when switching between the cooling operation and the heating operation. The four-way switching valve 2 connects the discharge side of the compressor 5 and the gas side of the indoor heat exchanger 40 and connects the gas side of the outdoor heat exchanger 46 and the suction side of the compressor 5 during heating operation. . The four-way switching valve 2 connects the discharge side of the compressor 5 and the gas side of the outdoor heat exchanger 46 during the cooling operation, and connects the gas side of the indoor heat exchanger 40 and the suction side of the compressor 5. Connecting.
The compressor 5 is a variable capacity compressor adopting an inverter system, and sucks low-pressure gas refrigerant, compresses it into high-pressure gas refrigerant, and discharges it.
The expansion valve 7 reduces the pressure of the high-pressure liquid refrigerant radiated in the indoor heat exchanger 40 during the heating operation before sending it to the outdoor heat exchanger 46, and the high-pressure liquid refrigerant radiated in the outdoor heat exchanger 46 during the cooling operation. The pressure is reduced before being sent to the heat exchanger 40.

The outdoor heat exchanger 46 is a heat exchanger that functions as a refrigerant condenser during the cooling operation and functions as a refrigerant evaporator during the heating operation.
(1-2) Indoor unit 4
The indoor unit 4 has an indoor heat exchanger 40. The indoor heat exchanger 40 is a fin-and-tube heat exchanger, and heats air by functioning as a refrigerant condenser during heating operation. In the cooling operation, the air is cooled by functioning as a refrigerant evaporator.
The indoor heat exchanger 40 includes a first heat exchange unit group 41, a second heat exchange unit group 42 connected in series with the first heat exchange unit group 41, a first heat exchange unit group 41, and a second heat exchange. A flow path switching valve 51 connected to the group 42 is included.

(2) Configuration of Indoor Unit 4 (2-1) First Heat Exchanger Group 41 and Second Heat Exchanger Group 42
The first heat exchange unit group 41 includes a first indoor heat exchange unit 40a and a second indoor heat exchange unit 40b connected in parallel to the first indoor heat exchange unit 40a. The second heat exchange unit group 42 includes a third indoor heat exchange unit 40c and a fourth indoor heat exchange unit 40d connected in parallel to the third indoor heat exchange unit 40c.
Each of the first indoor heat exchange unit 40a, the second indoor heat exchange unit 40b, the third indoor heat exchange unit 40c, and the fourth indoor heat exchange unit 40d employs a cross-fin type heat exchanger structure, It is comprised by the heat-transfer fin which consists of a thin aluminum flat plate, and several heat-transfer tubes which penetrate a heat-transfer fin.

(2-2) Flow path switching valve 51
FIG. 2 is a perspective view of the flow path switching valve 51 according to the first embodiment of the present invention. In FIG. 2, the flow path switching valve 51 includes a main body 10, a valve body 20, and a motor 30. The main body 10 is a cylindrical tube with one end closed. Four holes are formed in the body 10a of the main body 10 in advance, and pipes for pipe connection are fitted into the holes and brazed. For convenience of explanation, each of the four pipes is referred to as a first pipe connection part 11, a second pipe connection part 12, a third pipe connection part 13, and a fourth pipe connection part 14.
The first pipe connection portion 11 and the third pipe connection portion 13 are arranged around the trunk portion 10a at the same height as viewed from the bottom surface 10b side of the main body 10. The valve body 20 forms a valve mechanism for opening and closing the flow port of the first pipe connection unit 11 and the flow port of the second pipe connection unit 12 inside the main body 10, and this valve mechanism is connected to the first switching unit 101 (see FIG. 3A to 3D).

Similarly, the 2nd piping connection part 12 and the 4th piping connection part 14 are arrange | positioned around the trunk | drum 10a in the same height position seeing from the bottom face 10b side of the main body 10. FIG. The valve body 20 forms a valve mechanism that opens and closes the flow port of the third pipe connection portion 13 and the flow port of the fourth pipe connection portion 14 inside the main body 10, and this valve mechanism is connected to the second switching portion 102 (FIG. 3A to 3D). The first switching unit 101 is closer to the bottom surface 10 b than the second switching unit 102.
The inside of the main body 10 is a cylindrical cavity, and a valve body 20 that rotates along the circumferential surface is accommodated. The valve body 20 is driven by a motor 30 and switches to the first form, the second form, and the third form according to the rotation angle of the motor 30.
Here, the first form is a form in which the valve body 20 communicates the first pipe connection part 11 and the third pipe connection part 13 and communicates the second pipe connection part 12 and the fourth pipe connection part 14. is there. A 2nd form is a form in which the valve body 20 connects only the 1st piping connection part 11 and the 3rd piping connection part 13. As shown in FIG. The third form is a form in which the valve body 20 allows only the second pipe connection part 12 and the fourth pipe connection part 14 to communicate with each other. Hereinafter, a structure for forming each form will be described with reference to FIGS. 3A to 3D.

3A, the first switching unit 101 and the second switching unit 102 of the flow path switching valve 51 switched to the first form using the

first passages

21a and 21b are cut along a plane orthogonal to the central axis of the main body 10. It is sectional drawing of the flow-path switching valve 51 at the time.
3B, the first switching unit 101 and the second switching unit 102 of the flow path switching valve 51 switched to the second form using the third passage 23 are cut along a plane orthogonal to the central axis of the main body 10. It is sectional drawing of the flow-path switching valve 51 at the time.
3C shows the first switching unit 101 and the second switching unit 102 of the flow path switching valve 51 switched to the third form using the third passage 23 cut along a plane orthogonal to the central axis of the main body 10. It is sectional drawing of the flow-path switching valve 51 at the time.
3D cuts the first switching unit 101 and the second switching unit 102 of the flow path switching valve 51 switched to the first form using the

second passages

22a and 22b along a plane orthogonal to the central axis of the main body. It is sectional drawing of the flow-path switching valve 51 when it did.

3A to 3D, the second pipe connecting portion 12 is fixed at a position 180 degrees away from the first pipe connecting portion 11 in the clockwise direction with respect to the central axis of the trunk portion 10a.
Similar to the first switching unit 101, in the second switching unit 102, the fourth pipe connection unit 14 is fixed at a position 180 ° away from the third pipe connection unit 13 in the clockwise direction with respect to the central axis of the body 10 a. Has been.
The valve body 20 is a cylindrical rotating body, and is provided with

first passages

21a and 21b,

second passages

22a and 22b, and a third passage 23. The

first passages

21 a and 21 b are two grooves that are recessed from the peripheral surface of the valve body 20 toward the central axis, and are provided at positions that are 180 ° symmetrical with respect to the central axis of the valve body 20. The

first passages

21 a and 21 b extend from the first switching unit 101 to the second switching unit 102.

The

second passages

22 a and 22 b are two small grooves that are recessed from the peripheral surface of the valve body 20 toward the central axis, and each is provided at a position that is 180 ° symmetrical with respect to the central axis of the valve body 20. . The

second passages

22a and 22b are separated from the

first passages

21a and 21b by 60 ° in the clockwise direction with respect to the central axis of the valve body 20, and the respective passage sectional areas are the passage sectional areas of the

first passages

21a and 21b. Smaller than. The

second passages

22 a and 22 b reach from the first switching unit 101 to the second switching unit 102.
The third passage 23 includes only one groove that is recessed from the peripheral surface of the valve body 20 toward the central axis. The third passage 23 is separated from the first passage 21 a by 60 ° counterclockwise with respect to the central axis of the valve body 20. Further, the third passage 23 extends from the first switching unit 101 to the second switching unit 102.
In the first embodiment using the

first passages

21a and 21b, one first passage 21a faces the first pipe connection portion 11 and the third pipe connection portion 13, and the other first passage 21b is the second pipe connection portion. 12 and the fourth pipe connection portion 14.

In the first embodiment using the

second passages

22a and 22b, one second passage 22a faces the first pipe connection portion 11 and the third pipe connection portion 13, and the other second passage 22b is the second pipe. It faces the connection part 12 and the fourth pipe connection part 14.
Further, in the second form, the third passage 23 faces the first pipe connection part 11 and the third pipe connection part 13.
Furthermore, in the third form, the third passage 23 faces the second pipe connection part 12 and the fourth pipe connection part 14.
FIG. 4A is a refrigerant path diagram of the flow path switching valve 51 switched to the first form using the

first passages

21a and 21b. 4A, in the first embodiment using the

first passages

21a and 21b, the first pipe connecting portion 11 and the third pipe connecting portion 13 communicate with each other, and the second pipe connecting portion 12 and the fourth pipe connecting portion 14 are connected. And communicate.

FIG. 4B is a refrigerant path diagram of the flow path switching valve switched to the second form using the third passage 23. In FIG. 4B, in the 2nd form using the 3rd channel | path 23, only the 1st piping connection part 11 and the 3rd piping connection part 13 are connected.
FIG. 4C is a refrigerant path diagram of the flow path switching valve switched to the third form using the third passage 23. In FIG. 4C, in the 3rd form using the 3rd channel | path 23, only the 2nd piping connection part 12 and the 4th piping connection part 14 connect.
FIG. 4D is a refrigerant path diagram of the flow path switching valve switched to the first form using the

second passages

22a and 22b. 4D, in the first configuration using the

second passages

22a and 22b, the first pipe connecting portion 11 and the third pipe connecting portion 13 communicate with each other, and the second pipe connecting portion 12 and the fourth pipe connecting portion 14 are connected. And communicate. Furthermore, since the

second passages

22a and 22b have an extremely smaller passage cross-sectional area than the

first passages

21a and 21b, for example, when the refrigerant passes through the

second passages

22a and 22b, the refrigerant passes through the

second passages

22a and 22b. It is squeezed and depressurized.

(3) Flow of Refrigerant During Heating Operation Here, the flow of the refrigerant during the heating operation will be described with reference to FIGS. 1, 3A, and 4A. In FIG. 1, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the indoor heat exchanger 40 through the four-way switching valve 2. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, and one is sent to the third indoor heat exchanger 40c and the other is sent to the fourth indoor heat exchanger 40d.
As shown in FIG. 3A, during the heating operation, the flow path switching valve 51 is switched to the first form using the

first passages

21a and 21b. Therefore, as indicated by the dotted arrow in FIG. 4A, the refrigerant that has exited the third indoor heat exchange section 40c reaches the first pipe connection section 11 from the third pipe connection section 13 through the first passage 21a. . And the refrigerant | coolant which came out of the 1st piping connection part 11 enters into the 1st indoor heat exchange part 40a.

In addition, the refrigerant that has exited the fourth indoor heat exchange section 40d reaches the second pipe connection section 12 from the fourth pipe connection section 14 through the other first passage 21b. And the refrigerant | coolant which came out of the 2nd piping connection part 12 enters into the 2nd indoor heat exchange part 40b.
That is, in the indoor heat exchanger 40, the refrigerant condenses by heat exchanger with room air while flowing through the third indoor heat exchange unit 40 c and the first indoor heat exchange unit 40 a, and the fourth indoor heat. While flowing through the exchange unit 40d and the second indoor heat exchange unit 40b, the system is divided into two systems of refrigerant that condense through indoor air and heat exchangers. The high-pressure refrigerant condensed in the indoor heat exchanger 40 is sent to the expansion valve 7 and depressurized to a low pressure, and evaporates by exchanging heat with outdoor air in the outdoor heat exchanger 46. The low-pressure refrigerant evaporated in the outdoor heat exchanger 46 is again sucked into the compressor 5 through the four-way switching valve 2.

(4) Refrigerant Flow During Cooling Operation Here, the refrigerant flow during the cooling operation will be described with reference to FIGS. 1, 3A, and 4A. In FIG. 1, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the outdoor heat exchanger 46 through the four-way switching valve 2. The high-pressure refrigerant sent to the outdoor heat exchanger 46 radiates heat by exchanging heat with outdoor air. The high-pressure refrigerant that has dissipated heat in the outdoor heat exchanger 46 is sent to the expansion valve 7, depressurized to a low pressure, and sent to the indoor heat exchanger 40. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, and one is sent to the first indoor heat exchanger 40a and the other is sent to the second indoor heat exchanger 40b.
As shown in FIG. 3A, during normal cooling operation, the flow path switching valve 51 is switched to the first form using the

first passages

21a and 21b. Therefore, as indicated by the solid line arrow in FIG. 4A, the refrigerant that has exited the first indoor heat exchange section 40a reaches the third pipe connection section 13 from the first pipe connection section 11 through the first passage 21a. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c.

In addition, the refrigerant that has exited the second indoor heat exchange section 40b reaches the fourth pipe connection section 14 from the second pipe connection section 12 through the other first passage 21b. And the refrigerant | coolant which came out of the 4th piping connection part 14 enters into the 4th indoor heat exchange part 40d.
That is, in the indoor heat exchanger 40, the refrigerant evaporates by heat exchanger with room air while flowing through the first indoor heat exchanger 40a and the third indoor heat exchanger 40c, and the second indoor heat. While flowing through the exchanging unit 40b and the fourth indoor heat exchanging unit 40d, it is divided into two systems of refrigerant that evaporates by exchanging heat with indoor air. The low-pressure refrigerant evaporated in the indoor heat exchanger 40 is again sucked into the compressor 5 through the four-way switching valve 2.
(5) Flow of Refrigerant During Energy Saving Cooling Operation Here, the flow of refrigerant during the energy saving cooling operation will be described with reference to FIGS. 1, 3B, 3C, 4B, and 4C. In FIG. 1, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the outdoor heat exchanger 46 through the four-way switching valve 2. The high-pressure refrigerant sent to the outdoor heat exchanger 46 radiates heat by exchanging heat with outdoor air. The high-pressure refrigerant that has dissipated heat in the outdoor heat exchanger 46 is sent to the expansion valve 7, depressurized to a low pressure, and sent to the indoor heat exchanger 40. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, and one is sent to the first indoor heat exchanger 40a and the other is sent to the second indoor heat exchanger 40b.

During the energy-saving cooling operation, the flow path switching valve 51 is switched to the second form shown in FIG. 3B. Therefore, as indicated by the solid line arrow in FIG. 4B, the refrigerant that has exited the first indoor heat exchange section 40 a reaches the third pipe connection section 13 from the first pipe connection section 11 through the third passage 23. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c. The refrigerant sent to the second indoor heat exchange unit 40b does not flow but stays in the second indoor heat exchange unit 40b.
That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air while flowing through the first indoor heat exchange unit 40a and the third indoor heat exchange unit 40c. The low-pressure refrigerant evaporated in the indoor heat exchanger 40 is again sucked into the compressor 5 through the four-way switching valve 2.
In the energy-saving cooling operation, the flow path switching valve 51 can select the third mode shown in FIG. 3C. In this case, as shown in FIG. 4C, the refrigerant that has flowed out from the second indoor heat exchange unit 40b. Reaches the fourth pipe connection part 14 through the third passage 23 from the second pipe connection part 12. And the refrigerant | coolant which came out of the 4th piping connection part 14 enters into the 4th indoor heat exchange part 40d. The refrigerant sent to the first indoor heat exchange unit 40a does not flow but stays in the first indoor heat exchange unit 40a.

That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air while flowing through the second indoor heat exchange unit 40b and the fourth indoor heat exchange unit 40d. The low-pressure refrigerant evaporated in the indoor heat exchanger 40 is again sucked into the compressor 5 through the four-way switching valve 2.
(6) Refrigerant Flow During Reheat Dehumidification Operation Here, the refrigerant flow during the reheat dehumidification operation will be described with reference to FIGS. 1, 3D, and 4D. In FIG. 1, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. Since the expansion valve 7 is fully opened during the reheat dehumidification operation, the high-pressure refrigerant discharged from the compressor 5 passes through the four-way switching valve 2 and the first heat exchange of the outdoor heat exchanger 46 and the indoor heat exchanger 40. It extends to the instrument group 41. The high-pressure refrigerant sent from the outdoor heat exchanger 46 branches in two directions before the first heat exchange unit group 41, one enters the first indoor heat exchange unit 40a, and the other enters the second indoor unit. The heat exchange unit 40b is entered. That is, the high-pressure refrigerant is condensed by heat exchange with outdoor air in the indoor heat exchanger 46 and heat exchange with indoor air in the first heat exchange unit group 41.

Further, during the reheat dehumidifying operation, the flow path switching valve 51 forms a first form using the

second passages

22a and 22b having a small passage sectional area as shown in FIG. 3D. Therefore, the refrigerant that has exited the first indoor heat exchange section 40a is squeezed and depressurized during the period from the first pipe connection section 11 to the third pipe connection section 13 through one second passage 22a. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c, heat-exchanges with indoor air, and evaporates.
In addition, the refrigerant that has exited the second indoor heat exchange section 40b is squeezed and depressurized from the second pipe connection section 12 to the fourth pipe connection section 14 through the other second passage 22b. And the refrigerant | coolant which came out of the 4th piping connection part 14 enters into the 4th indoor heat exchange part 40d, and heat-exchanges with indoor air, and evaporates.
That is, in the indoor heat exchanger 40, the refrigerant is condensed by exchanging heat with the room air in the first indoor heat exchange unit 40a and evaporated by exchanging heat with the room air in the third indoor heat exchange unit 40c. The second indoor heat exchange section 40b is divided into two systems: a refrigerant that exchanges heat with indoor air and condenses, and a fourth indoor heat exchange section 40d exchanges heat with indoor air and evaporates. The low-pressure refrigerant evaporated in the third indoor heat exchange unit 40c and the fourth indoor heat exchange unit 40d is again sucked into the compressor 5 through the four-way switching valve 2.

(7) Features of the first embodiment (7-1)
When the flow path switching valve 51 is arranged at the inlet or outlet of the cooling evaporator having a plurality of paths through which the refrigerant flows, in the first form using the

first passages

21a and 21b, the entire evaporator is cooled. In the second mode or the third mode, cooling can be performed as an evaporator by flowing the refrigerant only in a part of the paths.
(7-2)
When the flow path switching valve 51 is disposed between two serially arranged paths through which the refrigerant flows, the upstream side of the flow path switching valve 51 is switched to the first form using the

second passages

22a and 22b. This path can be used as a condenser, and the downstream path can be used as an evaporator.

(7-3)
In the air conditioner including the flow path switching valve 51, the control unit 8 switches the flow path switching valve 51 to the second configuration during the cooling operation, whereby the first indoor heat exchange unit 40a and the second indoor heat exchange unit 40b. Since only the refrigerant can flow, only a part of the indoor heat exchanger 40 becomes an evaporator. Therefore, the usage capacity of the indoor heat exchanger 40 is reduced, and the refrigerant is prevented from immediately evaporating. Further, since the evaporation pressure is lowered and the evaporation temperature is lowered by reducing the use capacity of the indoor heat exchanger 40, for example, the amount of air blown to the entire indoor heat exchanger 40 does not change, and the indoor heat exchanger 40 that flows the refrigerant does not change. When the capacity decreases, the sucked air is dehumidified without taking much sensible heat.
(7-4)
In the air conditioner including the flow path switching valve 51, the control unit 8 switches the flow path switching valve 51 to the first form using the

second passages

22a and 22b, whereby the refrigerant is decompressed and the first indoor heat is generated. The exchange unit group 41 serves as a condenser, and the second indoor heat exchange unit group 42 serves as an evaporator. That is, the flow path switching valve 51 also has a function as an expansion valve during the reheat dehumidification operation.

(8) Modification of First Embodiment In the first embodiment, the

first passages

21a and 21b are two mutually independent grooves, but may be one groove. Hereinafter, a flow path switching valve according to a modification of the first embodiment will be described with reference to FIGS. 5A to 5C.
FIG. 5A is a flow path switching valve 51 according to a modification of the first embodiment, and the first switching unit 101 and the second switching section 101 of the flow path switching valve 51 switched to the first form using the first passage 21. 3 is a cross-sectional view of the flow path switching valve 51 when the switching unit 102 is cut along a plane orthogonal to the central axis of the main body 10. FIG.
FIG. 5B is a flow path switching valve 51 according to a modification of the first embodiment, and the first switching section 101 of the flow path switching valve 51 switched to the second form using the

third passage

23 and 4 is a cross-sectional view of the flow path switching valve 51 when the second switching unit 102 is cut along a plane orthogonal to the central axis of the main body 10. FIG.

Further, FIG. 5C is a flow path switching valve 51 according to a modification of the first embodiment, and the first switching unit 101 of the flow path switching valve 51 switched to the first form using the

second passage

22 and 4 is a cross-sectional view of the flow path switching valve 51 when the second switching unit 102 is cut along a plane orthogonal to the central axis of the main body 10. FIG.
5A to 5C, the second pipe connection portion 12 is fixed at a position 60 ° clockwise from the first pipe connection portion 11 with respect to the central axis of the trunk portion 10a.
Similar to the first switching unit 101, in the second switching unit 102, the fourth pipe connecting unit 14 is fixed at a position 60 ° clockwise from the third pipe connecting unit 13 with respect to the central axis of the body 10a. Has been.
The valve body 20 is a columnar rotating body and is provided with a first passage 21, a second passage 22, and a third passage 23. The first passage 21 is one groove that is recessed from the peripheral surface of the valve body 20 toward the central axis.

The second passage 22 is one small groove that is recessed from the peripheral surface of the valve body 20 toward the central axis. The second passage 22 is separated from the first passage 21 by 60 ° in the clockwise direction with respect to the central axis of the valve body 20, and the passage sectional area is smaller than the passage sectional area of the first passage 21.
The third passage 23 is one groove that is recessed from the peripheral surface of the valve body 20 toward the central axis. The third passage 23 is separated from the first passage 21 by 60 ° counterclockwise with respect to the central axis of the valve body 20.
In the first form using the first passage 21, the first passage 21 faces the first pipe connection portion 11, the second pipe connection portion 12, the third pipe connection portion 13, and the fourth pipe connection portion 14 simultaneously. Therefore, in the first embodiment using the first passage 21, the refrigerant flowing from the first pipe connection portion 11 and the second pipe connection portion 12 merges in the first passage 21, and then the third pipe connection portion 13 and The flow is diverted to the fourth pipe connection portion 14.

In the first form using the second passage 22, the second passage 22 faces the first pipe connecting portion 11, the second pipe connecting portion 12, the third pipe connecting portion 13, and the fourth pipe connecting portion 14 simultaneously. Therefore, in the 1st form using the 2nd passage 22, after the refrigerant which flows in from the 1st piping connection part 11 and the 2nd piping connection part 12 merges in the 2nd passage 22, the 3rd piping connection part 13 and The flow is diverted to the fourth pipe connection portion 14. Further, since the second passage 22 has an extremely smaller passage cross-sectional area than the first passage 21, for example, when the refrigerant passes through the second passage 22, the refrigerant is squeezed and decompressed in the second passage 22.
Further, in the second form, the third passage 23 faces the first pipe connection part 11 and the third pipe connection part 13. Therefore, in the 2nd form using the 3rd passage 23, only the 1st piping connection part 11 and the 3rd piping connection part 13 communicate.

In FIG. 1, the refrigerant flowing from the first indoor heat exchange section 40 a to the first pipe connection section 11 and from the second heat exchange section 40 b to the second pipe connection section 12 once joins in the first passage 21. The flow is divided into each of the third pipe connection portion 13 and the fourth pipe connection portion 14.
Therefore, even when a drift occurs in the refrigerant flowing from each of the first pipe connection portion 11 and the second pipe connection portion 12, the drift is eliminated in the first passage 21, and the third pipe connection portion 13 and the second pipe connection portion 13. Opportunities are given to the pipe connections 14 to be divided almost evenly.
(9) Features of Modification In the flow path switching valve 51, even when a drift occurs in the refrigerant flowing from each of the first pipe connection portion 11 and the second pipe connection portion 12, the drift is eliminated in the first passage 21. Thus, an opportunity is given to split the flow into the first pipe connection part 13 and the fourth pipe connection part 14 almost evenly.

Further, even when the refrigerant flowing from each of the first pipe connection part 11 and the second pipe connection part 12 has a drift, the drift is eliminated and the pressure is reduced in the second passage 22, and the first pipe connection part 13. And the opportunity to be divided almost equally into each of the 4th piping connection part 14 is given.
Second Embodiment
(1) Configuration of Air Conditioner FIG. 6A is a configuration diagram of an air conditioner including a flow path switching valve according to the second embodiment. 6A, the difference from FIG. 1 on the refrigerant circuit is that a bypass 61 is provided in place of the first indoor heat exchange section 40a of the first heat exchange section group 41 of the indoor heat exchanger 40. Other than that, since it is the same structure as the air conditioner described in FIG. 1, the same names and symbols are assigned to the same parts, and detailed description thereof is omitted.

In the flow path switching valve 51 according to the second embodiment, the valve body 20 opens and closes the flow port of the first pipe connection unit 11 and the flow port of the second pipe connection unit 12 inside the main body 10. 101 (see FIGS. 7A to 7F) and a second switching unit 102 (see FIGS. 7A to 7F) for opening and closing the flow port of the third pipe connection unit 13 and the flow port of the fourth pipe connection unit 14. ing. However, the configuration of the valve body 20 is different from that of the first embodiment. Hereinafter, the flow path switching valve 51 according to the second embodiment will be described with reference to FIGS. 7A to 7F.
(2) Configuration of Channel Switching Valve 51 FIG. 7A is a channel switching valve 51 according to the second embodiment, and the first passage 21 is switched to the first configuration facing the first pipe connection portion 11. 4 is a cross-sectional view of the flow path switching valve 51 when the first switching section 101 and the second switching section 102 of the flow path switching valve 51 are cut along a plane orthogonal to the central axis of the main body 10. FIG.

FIG. 7B is a flow path switching valve 51 according to the second embodiment, and the first switching section of the flow path switching valve 51 in which the first passage 21 is switched to the first configuration facing the second pipe connection section 12. FIG. 3 is a cross-sectional view of the flow path switching valve 51 when the 101 and the second switching unit 102 are cut along a plane orthogonal to the central axis of the main body 10.
FIG. 7C shows a flow path switching valve 51 according to the second embodiment, in which the third path 23 is switched to the second configuration facing the first pipe connection part 11 and the third pipe connection part 13. 4 is a cross-sectional view of the flow path switching valve 51 when the first switching unit 101 and the second switching unit 102 of the valve 51 are cut along a plane orthogonal to the central axis of the main body 10. FIG.
FIG. 7D is a flow path switching valve 51 according to the second embodiment, in which the third path 23 is switched to the second form facing the second pipe connection part 12 and the fourth pipe connection part 14. 4 is a cross-sectional view of the flow path switching valve 51 when the first switching unit 101 and the second switching unit 102 of the valve 51 are cut along a plane orthogonal to the central axis of the main body 10. FIG.

FIG. 7E is a flow path switching valve 51 according to the second embodiment, and the first switching section of the flow path switching valve 51 in which the second passage 22 is switched to the first configuration facing the first pipe connection section 11. FIG. 6 is a cross-sectional view of the flow path switching valve 51 when the 101 and the second switching unit 102 are cut along a plane orthogonal to the central axis of the main body 10.
FIG. 7F is a flow path switching valve 51 according to the second embodiment, in which the first switching portion of the flow path switching valve 51 is switched to the first configuration in which the second passage 22 faces the second pipe connection portion 12. FIG. 6 is a cross-sectional view of the flow path switching valve 51 when the 101 and the second switching unit 102 are cut along a plane orthogonal to the central axis of the main body 10.
7A to 7F, the second pipe connecting portion 12 is fixed at a position 180 degrees away from the first pipe connecting portion 11 in the clockwise direction with respect to the central axis of the trunk portion 10a.

Similar to the first switching unit 101, in the second switching unit 102, the fourth pipe connection unit 14 is fixed at a position 180 ° away from the third pipe connection unit 13 in the clockwise direction with respect to the central axis of the body 10 a. Has been.
FIG. 8 is a perspective view of the valve body 20 of the flow path switching valve 51 according to the second embodiment. In FIG. 8, the valve body 20 includes a first valve body portion 20 a that forms the first switching portion 101 inside the main body 10, and a second valve body portion 20 b that forms the second switching portion 102 inside the main body 10. Is included.
The first valve body 20a is a columnar rotating body. The second valve body portion 20b is a semi-cylindrical rotating body that protrudes from the upper surface of the first valve body portion 20a so that a part of the outer peripheral arc of the first valve body portion 20a extends, and the first valve body It rotates integrally with the part 20b.
The valve body 20 is provided with a first passage 21, a second passage 22, and a third passage 23. The 1st channel | path 21 is one groove | channel recessed toward the central axis from the surrounding surface of the 1st valve body part 20a.

The second passage 22 is one small groove that is recessed from the peripheral surface of the first valve body 20a toward the central axis. Further, the second passage 22 is separated from the first passage 21 by 120 ° in the clockwise direction with respect to the central axis of the first valve body portion 20 a, and the passage cross-sectional area is smaller than that of the first passage 21.
In the third passage 23, a groove recessed from the peripheral surface of the first valve body portion 20a toward the central axis and a groove recessed from the peripheral surface of the second valve body portion 20b toward the central axis are connected in a row. One groove. The third passage 23 is separated from the first passage 21 by 120 ° in the counterclockwise direction with respect to the central axis of the valve body 20.
In the state where the valve body 20 is disposed inside the main body 10, the first valve body 20 a does not reach the height of the third pipe connection portion 13 and the fourth pipe connection portion 14. The two passages 22 are connected to the same space by the second switching unit 102, and can face each other simultaneously with the third pipe connection part 13 and the fourth pipe connection part 14.

That is, in the first mode using the first passage 21, the first passage 21 faces the first pipe connection portion 11, whereby the first pipe connection portion 11, the third pipe connection portion 13, and the fourth pipe connection portion 14. Confront. In addition, since the 2nd piping connection part 12, the 3rd piping connection part 13, and the 4th piping connection part 14 are connected because the 1st channel | path 21 opposes the 2nd piping connection part 12, this state is referred to as a 1st channel | path. The first embodiment using 21 is substantially the same.
In the first form using the second passage 22, the first passage connection portion 11, the third passage connection portion 13, and the fourth passage connection portion 14 communicate with each other when the second passage 22 faces the first passage connection portion 11. To do. In addition, since the 2nd piping connection part 12, the 3rd piping connection part 13, and the 4th piping connection part 14 are connected because the 2nd channel | path 22 opposes the 2nd piping connection part 12, this state is referred to as a 2nd channel | path. The first embodiment using 22 is substantially the same.

Moreover, in the 2nd form, when the 3rd channel | path 23 opposes the 1st piping connection part 11 and the 3rd piping connection part 13, only the 1st piping connection part 11 and the 3rd piping connection part 13 are connected. In addition, since the 3rd channel | path 23 opposes the 2nd piping connection part 12 and the 4th piping connection part 14, since only the 2nd piping connection part 12 and the 4th piping connection part 14 communicate, this state, The second embodiment is substantially the same.
(3) Flow of refrigerant during heating operation (3-1) Normal heating A
Here, the flow of the refrigerant during the heating operation will be described with reference to FIGS. 6A, 7B, and 9B. In FIG. 6A, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the indoor heat exchanger 40 through the four-way switching valve 2. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, and one is sent to the third indoor heat exchanger 40c and the other is sent to the fourth indoor heat exchanger 40d.

FIG. 9B is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7B. 9B, 6A, and 7B, during the heating operation, the flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12. The refrigerant that has exited the third indoor heat exchange section 40c passes through the third pipe connection section 13, and the refrigerant that has exited the fourth indoor heat exchange section 40d passes through the fourth pipe connection section 14 to join at the second switching section 102. The second pipe connection portion 12 is reached through the first passage 21. And the refrigerant | coolant which came out of the 2nd piping connection part 12 enters into the 2nd indoor heat exchange part 40b.
That is, in the indoor heat exchanger 40, the refrigerant condenses as a heat exchanger with room air while flowing through the third indoor heat exchange unit 40c, the fourth indoor heat exchange unit 40d, and the second indoor heat exchange unit 40b. . The high-pressure refrigerant condensed in the indoor heat exchanger 40 is sent to the expansion valve 7 and depressurized to a low pressure, and evaporates by exchanging heat with outdoor air in the outdoor heat exchanger 46. The low-pressure refrigerant evaporated in the outdoor heat exchanger 46 is again sucked into the compressor 5 through the four-way switching valve 2.

(3-2) Normal heating B
Here, the flow of the refrigerant during the heating operation will be described with reference to FIGS. 6A, 7A, and 9A. In FIG. 6A, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the indoor heat exchanger 40 through the four-way switching valve 2. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, and one is sent to the third indoor heat exchanger 40c and the other is sent to the fourth indoor heat exchanger 40d.
FIG. 9A is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7A. 9A, 6A and 7A, during the heating operation, the flow path switching valve 51 is switched to the first form in which the first passage 21 faces the first pipe connection portion 11. The refrigerant that has exited the third indoor heat exchange section 40c passes through the third pipe connection section 13, and the refrigerant that has exited the fourth indoor heat exchange section 40d passes through the fourth pipe connection section 14 and joins in the second valve chamber 102. Then, the first pipe connection portion 11 is reached through the first passage 21. Then, the refrigerant exiting the first pipe connection portion 11 enters the bypass 61.

That is, in the indoor heat exchanger 40, the refrigerant condenses as a heat exchanger with indoor air while flowing through the third indoor heat exchanger 40c and the fourth indoor heat exchanger 40d. The high-pressure refrigerant condensed in the indoor heat exchanger 40 is sent to the expansion valve 7 and depressurized to a low pressure, and evaporates by exchanging heat with outdoor air in the outdoor heat exchanger 46. The low-pressure refrigerant evaporated in the outdoor heat exchanger 46 is again sucked into the compressor 5 through the four-way switching valve 2.
(3-3) Normal heating C
Here, the flow of the refrigerant during the heating operation will be described with reference to FIGS. 6A, 7D, and 9D.
FIG. 9D is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7D. 9D, 6A, and 7D, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the indoor heat exchanger 40 through the four-way switching valve 2. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, and one is sent to the third indoor heat exchanger 40c and the other is sent to the fourth indoor heat exchanger 40d.

As shown in FIG. 7D, the flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the second pipe connection part 12 and the fourth pipe connection part 14. Therefore, only the refrigerant that has passed through the fourth indoor heat exchange section 40d reaches the second pipe connection section 12 from the fourth pipe connection section 14 through the third passage 23. And the refrigerant | coolant which came out of the 2nd piping connection part 12 enters into the 2nd indoor heat exchange part 40b.
That is, in the indoor heat exchanger 40, the refrigerant condenses by exchanging heat with indoor air in the fourth indoor heat exchange unit 40d and the second indoor heat exchange unit 40b. The high-pressure refrigerant condensed in the indoor heat exchanger 40 is sent to the expansion valve 7 and depressurized to a low pressure, and evaporates by exchanging heat with outdoor air in the outdoor heat exchanger 46. The low-pressure refrigerant evaporated in the outdoor heat exchanger 46 is again sucked into the compressor 5 through the four-way switching valve 2.

(4) Flow of refrigerant during cooling operation (4-1) Normal cooling A
Here, the flow of the refrigerant during the cooling operation will be described with reference to FIGS. 6A, 7B, and 9B. In FIG. 6A, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the outdoor heat exchanger 46 through the four-way switching valve 2. The high-pressure refrigerant sent to the outdoor heat exchanger 46 radiates heat by exchanging heat with outdoor air. The high-pressure refrigerant that has dissipated heat in the outdoor heat exchanger 46 is sent to the expansion valve 7, depressurized to a low pressure, and sent to the indoor heat exchanger 40. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, and one is sent to the bypass 61 and the other is sent to the second indoor heat exchanger 40b.
9B, 6A, and 7B, during the normal cooling operation, the flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12. Since the first pipe connection portion 11 is closed, the refrigerant cannot flow through the bypass passage 61.

In addition, the refrigerant that has exited the second indoor heat exchange section 40 b reaches the third pipe connection section 13 and the fourth pipe connection section 14 through the first passage 21 from the second pipe connection section 12. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c. The refrigerant that has exited the fourth pipe connection portion 14 enters the fourth indoor heat exchange portion 40d.
That is, in the indoor heat exchanger 40, the refrigerant evaporates by exchanging with the indoor air while flowing through the second indoor heat exchange unit 40b, the third indoor heat exchange unit 40c, and the fourth indoor heat exchange unit 40d. To do. The low-pressure refrigerant evaporated in the indoor heat exchanger 40 is again sucked into the compressor 5 through the four-way switching valve 2.
(4-2) Normal cooling B
Here, the flow of the refrigerant during the cooling operation will be described with reference to FIGS. 6A, 7A, and 9A. In FIG. 6A, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the outdoor heat exchanger 46 through the four-way switching valve 2. The high-pressure refrigerant sent to the outdoor heat exchanger 46 radiates heat by exchanging heat with outdoor air. The high-pressure refrigerant that has dissipated heat in the outdoor heat exchanger 46 is sent to the expansion valve 7, depressurized to a low pressure, and sent to the indoor heat exchanger 40. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, one being sent to the bypass 61 and the other being sent to the second indoor heat exchanger 40b.

9A, 6A, and 7A, the flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the first pipe connection portion 11 during normal cooling operation. Since the second pipe connection portion 12 is closed, the refrigerant flows through the bypass passage 61.
Further, the refrigerant that has exited the bypass 61 reaches the third pipe connection part 13 and the fourth pipe connection part 14 through the first passage 21 from the first pipe connection part 11. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c. The refrigerant that has exited the fourth pipe connection portion 14 enters the fourth indoor heat exchange portion 40d.
That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air while flowing through the third indoor heat exchange unit 40c and the fourth indoor heat exchange unit 40d. The low-pressure refrigerant evaporated in the indoor heat exchanger 40 is again sucked into the compressor 5 through the four-way switching valve 2.

(4-3) Normal cooling C
Here, the flow of the refrigerant during the cooling operation will be described with reference to FIGS. 6A, 7D, and 9D.
FIG. 9D is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7D. 9D, 6A, and 7D, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the outdoor heat exchanger 46 through the four-way switching valve 2. The high-pressure refrigerant sent to the outdoor heat exchanger 46 radiates heat by exchanging heat with outdoor air. The high-pressure refrigerant that has dissipated heat in the outdoor heat exchanger 46 is sent to the expansion valve 7, depressurized to a low pressure, and sent to the indoor heat exchanger 40. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, one being sent to the bypass 61 and the other being sent to the second indoor heat exchanger 40b.

As shown in FIG. 7D, the flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the second pipe connection part 12 and the fourth pipe connection part 14. Therefore, only the refrigerant that has passed through the second indoor heat exchange section 40 b reaches the fourth pipe connection section 14 from the second pipe connection section 12 through the third passage 23. And the refrigerant | coolant which came out of the 4th piping connection part 14 enters into the 4th indoor heat exchange part 40d.
That is, in the indoor heat exchanger 40, the refrigerant evaporates by exchanging heat with indoor air in the second indoor heat exchange unit 40b and the fourth indoor heat exchange unit 40d. The low-pressure refrigerant evaporated in the indoor heat exchanger 40 is again sucked into the compressor 5 through the four-way switching valve 2.
(5) Flow of refrigerant during energy-saving cooling operation This air conditioner is suitable for energy-saving cooling operation in which the refrigerant can be evaporated only in the third indoor heat exchange section 40c. Hereinafter, the flow of the refrigerant during the energy-saving cooling operation will be described with reference to FIGS. 6A, 7C, and 9C.

FIG. 9C is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7C. 9C, 6A, and 7C, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. The high-pressure refrigerant discharged from the compressor 5 is sent to the outdoor heat exchanger 46 through the four-way switching valve 2. The high-pressure refrigerant sent to the outdoor heat exchanger 46 radiates heat by exchanging heat with outdoor air. The high-pressure refrigerant that has dissipated heat in the outdoor heat exchanger 46 is sent to the expansion valve 7, depressurized to a low pressure, and sent to the indoor heat exchanger 40. The refrigerant branches in two directions before the entrance of the indoor heat exchanger 40, one being sent to the bypass 61 and the other being sent to the second indoor heat exchanger 40b.
During the energy-saving cooling operation, the flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the first pipe connection part 11 and the third pipe connection part 13 as shown in FIG. 7C. Therefore, only the refrigerant that has passed through the bypass passage 61 reaches the third pipe connection portion 13 from the first pipe connection portion 11 through the third passage 23. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c.

That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air only in the third indoor heat exchange section 40c. The low-pressure refrigerant evaporated in the indoor heat exchanger 40 is again sucked into the compressor 5 through the four-way switching valve 2.
(6) Refrigerant Flow During Reheat Dehumidification Operation Here, the refrigerant flow during the reheat dehumidification operation will be described with reference to FIGS. 6A, 7F, and 9F. In FIG. 6A, the refrigerant is sucked into the compressor 5 and discharged after being compressed to a high pressure. Since the expansion valve 7 is fully opened during the reheat dehumidification operation, the high-pressure refrigerant discharged from the compressor 5 passes through the four-way switching valve 2 and the first heat exchange of the outdoor heat exchanger 46 and the indoor heat exchanger 40. It extends to the instrument group 41. The high-pressure refrigerant sent from the outdoor heat exchanger 46 branches in two directions before the first heat exchange unit group 41, one is sent to the bypass passage 61, and the other is the second indoor heat exchange unit. Sent to 40b. However, since the first pipe connection portion 11 connected to the bypass path 61 is closed by the flow path switching valve 51, the refrigerant does not flow through the bypass path 61. Then, the high-pressure refrigerant is condensed by heat exchange with outdoor air in the indoor heat exchanger 46 and heat exchange with indoor air in the second heat exchange unit 40b.

FIG. 9F is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7F. 9F, FIG. 6A, and FIG. 7F, during the reheat dehumidifying operation, the flow path switching valve 51 has a first configuration in which the second passage 22 having a small passage cross-sectional area faces the second pipe connection portion 12. . Therefore, the refrigerant that has exited the second indoor heat exchange section 40b is squeezed between the second pipe connection section 12 and the third pipe connection section 13 and the fourth pipe connection section 14 through the second passage 22. Depressurized. The refrigerant that has exited the third pipe connection section 13 enters the third indoor heat exchange section 40c, and the refrigerant that exits the fourth pipe connection section 14 enters the fourth indoor heat exchange section 40d to exchange heat with room air. Evaporate.
That is, in the indoor heat exchanger 40, the refrigerant exchanges heat with the indoor air in the second indoor heat exchange unit 40b and condenses, and the indoor air and heat are condensed in the third indoor heat exchange unit 40c and the fourth indoor heat exchange unit 40d. Evaporate on exchanger. The low-pressure refrigerant evaporated in the third indoor heat exchange unit 40c and the fourth indoor heat exchange unit 40d is again sucked into the compressor 5 through the four-way switching valve 2.

(7) Features of the second embodiment (7-1)
In the air conditioner including the flow path switching valve 51 according to the second embodiment, the refrigerant that has entered the first pipe connection portion 11 from the bypass passage 61 is caused to flow from the third pipe connection portion 13 to the third heat exchange portion 40c. The use capacity of the indoor heat exchanger 40 can be reduced. As a result, when the refrigerant circulation amount is small, the refrigerant is prevented from immediately evaporating by reducing the use capacity of the indoor heat exchanger 40.
Further, since the evaporation pressure is lowered and the evaporation temperature is lowered due to the reduction of the use capacity of the indoor heat exchanger 40, the volume of the indoor heat exchanger 40 through which the refrigerant flows without changing the amount of air blown to the entire indoor heat exchanger 40. The suction air is dehumidified without taking much sensible heat away.

(8) The second air conditioner including the flow path switching valve 51 according to the second embodiment In the air conditioner including the flow path switching valve 51 according to the second embodiment, the first pipe connection portion 11 is bypassed. Although the path 61 is connected and the second indoor heat exchange part 40b is connected to the second pipe connection part 12, it is not limited to this.
FIG. 6B is a configuration diagram of a second air conditioner including a flow path switching valve according to the second embodiment. In FIG. 6B, the first heat exchange part 40 a is connected to the first pipe connection part 11, and the bypass path 61 is connected to the second pipe connection part 12.
In the heating operation, the cooling operation, the energy-saving cooling operation, and the reheat dehumidifying operation, the flow of the refrigerant before and after the flow path switching valve 51 is the same as that of the air conditioner. Only the flow of the refrigerant in the flow path switching valve 51 in the reheat dehumidification operation will be described.

(8-1) Flow of refrigerant during heating operation (8-1-1) Normal heating A
FIG. 9A is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7A. 9A, 6B, and 7A, the flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the first pipe connection portion 11. The refrigerant exiting the third indoor heat exchange section 40c joins at the second switching section 102 through the third pipe connection section 13, the refrigerant exiting the fourth indoor heat exchange section 40d passes through the fourth pipe connection section 14, and the second switching section 102 joins. The first pipe connection portion 11 is reached through the one passage 21. And the refrigerant | coolant which came out of the 1st piping connection part 11 enters into the 1st indoor heat exchange part 40a.
That is, in the indoor heat exchanger 40, the refrigerant condenses as a heat exchanger with room air while flowing through the third indoor heat exchange unit 40c, the fourth indoor heat exchange unit 40d, and the second indoor heat exchange unit 40b. .

(8-1-2) Normal heating B
FIG. 9B is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7B. 9B, 6B, and 7B, the flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12. The refrigerant exiting the third indoor heat exchange section 40c joins in the second valve chamber 102 through the third pipe connection section 13, the refrigerant exiting the fourth indoor heat exchange section 40d passes through the fourth pipe connection section 14, and the second It reaches the second pipe connection part 12 through the one passage 21. Then, the refrigerant that has exited the second pipe connection portion 12 enters the bypass 61.
That is, in the indoor heat exchanger 40, the refrigerant condenses as a heat exchanger with indoor air while flowing through the third indoor heat exchanger 40c and the fourth indoor heat exchanger 40d.
(8-1-3) Normal heating C
FIG. 9C is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7C. 9C, FIG. 6B, and FIG. 7C, at the time of heating operation, the flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the first pipe connection portion 11 and the third pipe connection portion 13. . Therefore, the refrigerant that has passed through the third indoor heat exchange section 40 c reaches the first pipe connection section 11 from the third pipe connection section 13 through the third passage 23. And the refrigerant | coolant which came out of the 1st piping connection part 11 enters into the 1st indoor heat exchange part 40a.

That is, in the indoor heat exchanger 40, the refrigerant condenses by exchanging heat with indoor air in the third indoor heat exchange unit 40c and the first indoor heat exchange unit 40a.
(8-2) Refrigerant flow during cooling operation (8-2-1) Normal cooling A
9A, 6B, and 7A, the flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the first pipe connection portion 11 during normal cooling operation. Since the second pipe connection portion 12 is closed, the refrigerant cannot flow through the bypass passage 61.
In addition, the refrigerant that has exited the first indoor heat exchange section 40 a reaches the third pipe connection section 13 and the fourth pipe connection section 14 from the first pipe connection section 11 through the first passage 21. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c. The refrigerant that has exited the fourth pipe connection portion 14 enters the fourth indoor heat exchange portion 40d.

That is, in the indoor heat exchanger 40, the refrigerant evaporates by exchanging with the indoor air while flowing through the first indoor heat exchange unit 40a, the third indoor heat exchange unit 40c, and the fourth indoor heat exchange unit 40d. To do.
(8-2-2) Normal cooling B
9B, 6B, and 7B, during the cooling operation, the flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12. Since the first pipe connection portion 11 is closed, the refrigerant flows through the bypass passage 61.
Further, the refrigerant that has exited the bypass 61 reaches the third pipe connection part 13 and the fourth pipe connection part 14 through the first passage 21 from the second pipe connection part 12. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c. The refrigerant that has exited the fourth pipe connection portion 14 enters the fourth indoor heat exchange portion 40d.

That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air while flowing through the third indoor heat exchange unit 40c and the fourth indoor heat exchange unit 40d.
(8-2-3) Normal cooling C
FIG. 9C is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7C. 9C, FIG. 6B, and FIG. 7C, at the time of air_conditionaing | cooling operation, the flow-path switching valve 51 is switched to the 2nd form in which the 3rd channel | path 23 opposes the 1st piping connection part 11 and the 3rd piping connection part 13. . Therefore, the refrigerant that has passed through the first indoor heat exchange section 40 a reaches the third pipe connection section 13 from the first pipe connection section 11 through the third passage 23. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 3rd indoor heat exchange part 40c.
That is, in the indoor heat exchanger 40, the refrigerant evaporates by exchanging heat with indoor air in the first indoor heat exchanger 40a and the third indoor heat exchanger 40c.

(8-3) Refrigerant Flow During Energy Saving Cooling Operation FIG. 9D is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7D. 9D, 6B, and 7D, during the energy saving cooling operation, the flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the second pipe connection part 12 and the fourth pipe connection part 14. Yes. Therefore, the refrigerant that has passed through the bypass passage 61 reaches the fourth pipe connection portion 14 through the third passage 23 from the second pipe connection portion 12. And the refrigerant | coolant which came out of the 4th piping connection part 14 enters into the 4th indoor heat exchange part 40d.
That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air only in the fourth indoor heat exchange section 40d.
(8-4) Refrigerant Flow During Reheat Dehumidification Operation FIG. 9E is a refrigerant path diagram of the flow path switching valve corresponding to FIG. 7E. 9E, 6B, and 7E, during the reheat dehumidifying operation, the flow path switching valve 51 has a first configuration in which the second passage 22 having a small passage cross-sectional area faces the first pipe connection portion 11. . Therefore, the refrigerant that has exited the first indoor heat exchange section 40a is squeezed between the first pipe connection section 11 and the third pipe connection section 13 and the fourth pipe connection section 14 through the second passage 22. Depressurized. The refrigerant that has exited the third pipe connection section 13 enters the third indoor heat exchange section 40c, and the refrigerant that exits the fourth pipe connection section 14 enters the fourth indoor heat exchange section 40d to exchange heat with room air. Evaporate.

That is, in the indoor heat exchanger 40, the refrigerant exchanges heat with the indoor air in the first indoor heat exchanger 40a and condenses, and the indoor air and heat are condensed in the third indoor heat exchanger 40c and the fourth indoor heat exchanger 40d. Evaporate on exchanger.
(9) Third air conditioner including the flow path switching valve 51 according to the second embodiment In the air conditioner and the second air conditioner including the flow path switching valve 51 according to the second embodiment, Although the bypass path is connected to one of the first pipe connection part 11 and the second pipe connection part 12 and the heat exchange part is connected to the other, it is not limited to this.
FIG. 10A is a configuration diagram of a third air conditioner including a flow path switching valve 51 according to the second embodiment. In FIG. 10A, the 1st heat exchange part 40a is connected to the 3rd piping connection part 13, the 2nd indoor heat exchange part 40b is connected to the 4th piping connection part 14, the bypass path 71 is connected to the 1st piping connection part 11, and 2nd piping. The fourth indoor heat exchange unit 40d is connected to the connection unit 12.

In the heating operation, the cooling operation, the energy saving cooling operation, and the reheat dehumidifying operation, the refrigerant flow before and after the flow path switching valve 51 is the same as that in the second air conditioner. Only the flow of the refrigerant in the flow path switching valve 51 in the cooling operation and the reheat dehumidification operation will be described.
(9-1) Flow of refrigerant during heating operation (9-1-1) Normal heating A
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12 (see FIGS. 7B and 9B). The refrigerant that has exited the fourth indoor heat exchange unit 40d enters the first switching unit 101 through the second pipe connection unit 12, and reaches the second switching unit 102 through the first passage 21. The refrigerant is divided into the third pipe connection part 13 and the fourth pipe connection part 14 in the second switching part 102. The refrigerant that has exited the third pipe connection section 13 enters the first indoor heat exchange section 40a, and the refrigerant that has exited the fourth pipe connection section 14 enters the second indoor heat exchange section 40b.

That is, in the indoor heat exchanger 40, the refrigerant condenses as a heat exchanger with room air while flowing through the fourth indoor heat exchange unit 40d, the first indoor heat exchange unit 40a, and the second indoor heat exchange unit 40b. .
(9-1-2) Normal heating B
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the first pipe connection portion 11 (see FIGS. 7A and 9A). The refrigerant that has exited the bypass 71 enters the first valve chamber 101 through the first pipe connection portion 11, reaches the second valve chamber 102 through the first passage 21. The refrigerant is divided into the third pipe connection portion 13 and the fourth pipe connection portion 14 in the second valve chamber 102. The refrigerant that has exited the third pipe connection section 13 enters the first indoor heat exchange section 40a, and the refrigerant that has exited the fourth pipe connection section 14 enters the second indoor heat exchange section 40b.
That is, in the indoor heat exchanger 40, the refrigerant condenses by exchanging with the indoor air while flowing through the first indoor heat exchange unit 40a and the second indoor heat exchange unit 40b.

(9-1-3) Normal heating C
The flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the second pipe connection part 12 and the fourth pipe connection part 14 (see FIGS. 7D and 9D). Therefore, the refrigerant that has passed through the fourth indoor heat exchange part 40d reaches the fourth pipe connection part 14 through the third passage 23 from the second pipe connection part 12. And the refrigerant | coolant which came out of the 4th piping connection part 14 enters into the 2nd indoor heat exchange part 40b.
That is, in the indoor heat exchanger 40, the refrigerant condenses by exchanging heat with indoor air in the fourth indoor heat exchange unit 40d and the second indoor heat exchange unit 40b.
(9-2) Flow of refrigerant during cooling operation (9-2-1) Normal cooling A
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12 (see FIGS. 7B and 9B). Since the first pipe connection portion 11 is closed, the refrigerant cannot flow through the bypass path 71.

The refrigerant that has exited the first indoor heat exchange section 40 a and entered the third pipe connection section 13 and the refrigerant that has exited the second indoor heat exchange section 40 b and entered the fourth pipe connection section joins at the second switching section 102. The first pipe 21 passes through the second pipe connection portion 12. And the refrigerant | coolant which came out of the 2nd piping connection part 12 enters into the 4th indoor heat exchange part 40d.
That is, in the indoor heat exchanger 40, the refrigerant evaporates by exchanging with the indoor air while flowing through the first indoor heat exchange unit 40a, the second indoor heat exchange unit 40b, and the fourth indoor heat exchange unit 40d. To do.
(9-2-2) Normal cooling B
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the first pipe connection portion 11 (see FIGS. 7A and 9A). Since the second pipe connection portion 12 is closed, the refrigerant flows through the bypass passage 71.

The refrigerant that has exited the first indoor heat exchange section 40a and entered the third pipe connection section 13 and the refrigerant that has exited the second indoor heat exchange section 40b and entered the fourth pipe connection section 14 are in the second valve chamber 102. It merges and passes through the first passage 21 to the first pipe connection portion 11. Then, the refrigerant that has exited the first pipe connection portion 11 enters the bypass 71.
That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air while flowing through the first indoor heat exchange unit 40a and the second indoor heat exchange unit 40b.
(9-2-3) Normal cooling C
During the cooling operation, the flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the second pipe connection part 12 and the fourth pipe connection part 14 (see FIGS. 7D and 9D). Therefore, the refrigerant that has passed through the second indoor heat exchange section 40 b reaches the second pipe connection section 12 from the fourth pipe connection section 14 through the third passage 23. And the refrigerant | coolant which came out of the 2nd piping connection part 12 enters into the 4th indoor heat exchange part 40d.

That is, in the indoor heat exchanger 40, the refrigerant evaporates by exchanging heat with indoor air in the second indoor heat exchange unit 40b and the fourth indoor heat exchange unit 40d.
(9-3) Flow of Refrigerant During Energy Saving Cooling Operation During energy saving cooling operation, the flow path switching valve 51 is changed to the second configuration in which the third passage 23 faces the first pipe connecting portion 11 and the third pipe connecting portion 13. They are switched (see FIGS. 7C and 9C). Therefore, the refrigerant that has passed through the first indoor heat exchange section 40 a reaches the first pipe connection section 11 from the third pipe connection section 13 through the third passage 23. Then, the refrigerant that has exited the first pipe connection portion 11 enters the bypass passage 71.
That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air only in the first indoor heat exchange section 40a.

(9-4) Refrigerant Flow During Reheat Dehumidification Operation During the reheat dehumidification operation, the flow path switching valve 51 has a first configuration in which the second passage 22 having a small passage cross-sectional area faces the second pipe connection portion 12. (See FIGS. 7F and 9F). Therefore, the refrigerant that has exited the first indoor heat exchange section 40a and entered the third pipe connection section 13 and the refrigerant that has exited the second indoor heat exchange section 40b and entered the fourth pipe connection section 14 are second switched. In the portion 102, the pressure is reduced by being squeezed while reaching the second pipe connection portion 12 through the second passage 22. And the refrigerant | coolant which came out of the 2nd piping connection part 12 enters into the 4th indoor heat exchange part 40d, and heat-exchanges with indoor air, and evaporates.
That is, in the indoor heat exchanger 40, the refrigerant is condensed by exchanging heat with room air in the first indoor heat exchange unit 40a and the second indoor heat exchange unit 40b, and condensed in the fourth indoor heat exchange unit 40d. Evaporate on exchanger.

(10) Fourth air conditioner including the flow path switching valve 51 according to the second embodiment In the third air conditioner including the flow path switching valve 51 according to the second embodiment, the first pipe connection Although the bypass path 71 is connected to the part 11 and the fourth indoor heat exchanging part 40d is connected to the second pipe connection part 12, it is not limited to this.
FIG. 10B is a configuration diagram of a fourth air conditioner including the flow path switching valve 51 according to the second embodiment. In FIG. 10B, the third indoor heat exchange part 40 c is connected to the first pipe connection part 11, and the bypass path 71 is connected to the second pipe connection part 12.
In the heating operation, the cooling operation, the energy-saving cooling operation, and the reheat dehumidifying operation, the flow of the refrigerant before and after the flow path switching valve 51 is the same as that of the air conditioner. Only the flow of the refrigerant in the flow path switching valve 51 in the reheat dehumidification operation will be described.

(10-1) Refrigerant flow during heating operation (10-1-1) Normal heating A
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the first pipe connection portion 11 (see FIGS. 7A and 9A). The refrigerant that has exited the third indoor heat exchange section 40 c enters the first switching section 101 through the first pipe connection section 11, and reaches the second switching section 102 through the first passage 21. The refrigerant is divided into the third pipe connection part 13 and the fourth pipe connection part 14 in the second switching part 102. The refrigerant that has exited the third pipe connection section 13 enters the first indoor heat exchange section 40a, and the refrigerant that has exited the fourth pipe connection section 14 enters the second indoor heat exchange section 40b.
That is, in the indoor heat exchanger 40, the refrigerant condenses as a heat exchanger with room air while flowing through the third indoor heat exchange unit 40c, the first indoor heat exchange unit 40a, and the second indoor heat exchange unit 40b. .

(10-1-2) Normal heating B
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12 (see FIGS. 7B and 9B). The refrigerant that has exited the bypass 71 enters the first valve chamber 101 through the second pipe connection portion 12, and reaches the second valve chamber 102 through the first passage 21. The refrigerant is divided into the third pipe connection portion 13 and the fourth pipe connection portion 14 in the second valve chamber 102. The refrigerant that has exited the third pipe connection section 13 enters the first indoor heat exchange section 40a, and the refrigerant that has exited the fourth pipe connection section 14 enters the second indoor heat exchange section 40b.
That is, in the indoor heat exchanger 40, the refrigerant condenses by exchanging with the indoor air while flowing through the first indoor heat exchange unit 40a and the second indoor heat exchange unit 40b.
(10-1-3) Normal heating C
The flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the first pipe connection portion 11 and the third pipe connection portion 13 (see FIGS. 7C and 9C). Therefore, the refrigerant that has passed through the third indoor heat exchange section 40 c reaches the third pipe connection section 13 from the first pipe connection section 11 through the third passage 23. And the refrigerant | coolant which came out of the 3rd piping connection part 13 enters into the 1st indoor heat exchange part 40a.

That is, in the indoor heat exchanger 40, the refrigerant condenses by exchanging heat with indoor air in the third indoor heat exchange unit 40c and the first indoor heat exchange unit 40a.
(10-2) Flow of refrigerant during cooling operation (10-2-1) Normal cooling A
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the first pipe connection portion 11 (see FIGS. 7A and 9A). Since the second pipe connection portion 12 is closed, the refrigerant cannot flow through the bypass path 71.
The refrigerant that has exited the first indoor heat exchange section 40a and entered the third pipe connection section 13 and the refrigerant that has exited the second indoor heat exchange section 40b and entered the fourth pipe connection section 14 are received by the second switching section 102. It merges and passes through the first passage 21 to the first pipe connection portion 11. And the refrigerant | coolant which came out of the 1st piping connection part 11 enters into the 3rd indoor heat exchange part 40c.

That is, in the indoor heat exchanger 40, it evaporates as a heat exchanger with room air while flowing through the first indoor heat exchange part 40a, the second indoor heat exchange part 40b, and the third indoor heat exchange part 40c.
(10-2-2) Normal cooling B
The flow path switching valve 51 is switched to the first configuration in which the first passage 21 faces the second pipe connection portion 12 (see FIGS. 7B and 9B). Since the first pipe connection portion 11 is closed, the refrigerant flows through the bypass passage 71.
The refrigerant that has exited the first indoor heat exchange section 40a and entered the third pipe connection section 13 and the refrigerant that has exited the second indoor heat exchange section 40b and entered the fourth pipe connection section 14 are in the second valve chamber 102. It merges and passes through the first passage 21 to reach the second pipe connecting portion 12. Then, the refrigerant that has exited the second pipe connection portion 12 enters the bypass 71.

That is, in the indoor heat exchanger 40, it evaporates as a heat exchanger with room air while flowing through the first indoor heat exchange part 40a and the second indoor heat exchange part 40b.
(10-2-3) Normal cooling C
The flow path switching valve 51 is switched to the second configuration in which the third passage 23 faces the first pipe connection portion 11 and the third pipe connection portion 13 (see FIGS. 7C and 9C). Therefore, the refrigerant that has passed through the first indoor heat exchange section 40 a reaches the first pipe connection section 11 from the third pipe connection section 13 through the third passage 23. And the refrigerant | coolant which came out of the 1st piping connection part 11 enters into the 3rd indoor heat exchange part 40c.
That is, in the indoor heat exchanger 40, the refrigerant evaporates by exchanging heat with indoor air in the first indoor heat exchanger 40a and the third indoor heat exchanger 40c.

(10-3) Flow of Refrigerant During Energy Saving Cooling Operation During energy saving cooling operation, the flow path switching valve 51 is changed to the second configuration in which the third passage 23 faces the second pipe connecting portion 12 and the fourth pipe connecting portion 14. It has been switched (see FIGS. 7D and 9D). Therefore, the refrigerant that has passed through the second indoor heat exchange section 40 b reaches the second pipe connection section 12 from the fourth pipe connection section 14 through the third passage 23. Then, the refrigerant that has exited the second pipe connection portion 12 enters the bypass passage 71.
That is, in the indoor heat exchanger 40, the refrigerant evaporates as a heat exchanger with room air only in the second indoor heat exchange section 40b.
(10-4) Refrigerant Flow During Reheat Dehumidification Operation During the reheat dehumidification operation, the flow path switching valve 51 has a first configuration in which the second passage 22 having a small passage cross-sectional area faces the first pipe connection portion 11. (See FIGS. 7E and 9E). Therefore, the refrigerant that has exited the first indoor heat exchange section 40a and entered the third pipe connection section 13 and the refrigerant that has exited the second indoor heat exchange section 40b and entered the fourth pipe connection section 14 are second switched. In the portion 102, the pressure is reduced by being squeezed while reaching the first pipe connection portion 11 through the second passage 22. And the refrigerant | coolant which came out of the 1st piping connection part 11 enters into the 3rd indoor heat exchange part 40c, heats with indoor air, and evaporates.

That is, in the indoor heat exchanger 40, the refrigerant is condensed by exchanging heat with room air in the first indoor heat exchange unit 40a and the second indoor heat exchange unit 40b, and is condensed in the third indoor heat exchange unit 40c. Evaporate on exchanger.
(11) Features of the third and fourth air conditioners provided with the flow path switching valve according to the second embodiment (11-1)
In the third and fourth air conditioners including the flow path switching valve 51 according to the second embodiment, the amount of air blown to the entire indoor heat exchanger 40 is reduced by reducing the use capacity of the indoor heat exchanger 40. Since the capacity of the indoor heat exchanger 40 through which the refrigerant flows is reduced, the sucked air is dehumidified without taking much sensible heat.
(11-2)
In addition, by using the third pipe connection part 13 and the fourth pipe connection part 14 as an inlet and using the first pipe connection part 11 or the second pipe connection part 12 as an outlet, two recirculation dehumidification operations can be performed. A configuration in which the refrigerant from the condenser is depressurized and sent to the evaporator in one is possible.

As described above, according to the present invention, switching of the number of fluid paths and switching to a bypass circuit or the like are performed by a single flow path switching valve, which is useful for an air conditioner.

5 Compressor 7 Expansion valve (pressure reducer)
8 Control part 10 Main body 11 1st piping connection part (1st inflow port)
12 Second piping connection (second inlet)
13 Third piping connection (first outlet)
14 Fourth piping connection (second outlet)
20 Valve body (movable body)
21, 21a,

21b 1st passage

22, 22a, 22b 2nd passage 23 3rd passage 40 indoor heat exchanger 40a 1st indoor heat exchange part 40b 2nd indoor heat exchange part 40c 3rd indoor heat exchange part 40d 4th room Heat Exchanger 41 First Indoor Heat Exchanger Group 42 Second Indoor Heat Exchanger Group 46 Outdoor Heat Exchanger 51 Channel Switch Valve 61 Bypass Channel 71 Bypass Channel 101 First Switch Unit (First Valve Mechanism Unit)
102 2nd switching part (2nd valve mechanism part)

JP 2003-148830 A

Claims

A flow path switching valve for switching a flow path of fluid,
A body (10) having a plurality of inlets and outlets;
A movable body (20) for communicating the inlet and the outlet;
With
The plurality of inlets include at least a first inlet (11) and a second inlet (12);
The plurality of outlets include at least a first outlet (13) and a second outlet (14);
The movable body (20) is inside the main body (10),
A first valve mechanism (101) for opening and closing the first inlet (11) and / or the second inlet (12);
A second valve mechanism (102) for opening and closing the first outlet (13) and / or the second outlet (14);
Form the
Furthermore, the movable body (20)
The fluid is allowed to flow from the first inlet (11) and the second inlet (12) into the first valve mechanism (101) and then from the second valve mechanism (102). A first configuration leading to an outlet (13) and the second outlet (14); and
The fluid is introduced only from the first inlet (11) into the first valve mechanism (101) and then introduced from the second valve mechanism (102) only to the first outlet (13). Two forms,
Switch to one of the
A flow path switching valve (51).
The movable body (20)
A first passage (21, 21a, 21b) for communicating the first valve mechanism (101) and the second valve mechanism (102);
The first valve mechanism (101) and the second valve mechanism (102) communicate with each other, and a second passage (22, 22a, 22b)
Have
When the switching to the first form is performed, one of the first passage (21, 21a, 21b) or the second passage (22, 22a, 22b) is selected.
The flow path switching valve (51) according to claim 1.
In the first mode in which the first passage (21) is selected, fluids that have entered from the first inlet (11) and the second inlet (12) merge in the first passage (21).
The flow path switching valve (51) according to claim 2.
In the first mode in which the second passage (22) is selected, fluids that have entered from the first inlet (11) and the second inlet (12) merge in the second passage (22).
The flow path switching valve (51) according to claim 2.
A flow path switching valve for switching a flow path of fluid,
A body (10) having a plurality of inlets and outlets;
A movable body (20) for communicating the inlet and the outlet;
With
The plurality of inlets include at least a first inlet (11) and a second inlet (12);
The plurality of outlets include at least a first outlet (13) and a second outlet (14);
The movable body (20) is inside the main body (10),
A first valve mechanism (101) for opening and closing the first inlet (11);
A second valve mechanism (102) for opening and closing the first outlet (13) and / or the second outlet (14);
Form the
Furthermore, the movable body (20)
After allowing the fluid to flow into the first valve mechanism (101) only from the first inlet (11), the first outlet (13) and the second from the second valve mechanism (102). A first configuration leading to the outlet (14), and
The fluid is introduced only from the first inlet (11) into the first valve mechanism (101) and then introduced from the second valve mechanism (102) only to the first outlet (13). Two forms,
Switch to one of the
A flow path switching valve (51).
The movable body (20)
A first passage (21) communicating the first valve mechanism (101) and the second valve mechanism (102);
A second passage (22) in which the first valve mechanism (101) and the second valve mechanism (102) communicate with each other, and a passage sectional area is smaller than that of the first passage (21a);
Have
When switching to the first form is performed, either the first passage (21) or the second passage (22) is selected.
The flow path switching valve (51) according to claim 5.
The movable body (20)
A common space for guiding the fluid flowing into the second valve mechanism (102) to both the first outlet (13) and the second outlet (14);
A third passage (23) for guiding the fluid flowing into the first valve mechanism (101) only to the first outlet (13);
Further comprising
When switching to the first form is performed, either the first passage (21) or the second passage (21b) and the common space are selected,
When switching to the second form is performed, the third passage (23) is selected,
The flow path switching valve (51) according to claim 6.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a first indoor heat exchange section (40a) and a second indoor heat exchange section (40b) connected in parallel with the first indoor heat exchange section (40a);
A second indoor heat exchange section group (42) including a third indoor heat exchange section (40c) and a fourth indoor heat exchange section (40d) connected in parallel with the third indoor heat exchange section (40c);
The flow path switching valve according to any one of claims 1 to 5, wherein the flow path switching valve is disposed between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42). (51),
Have
The first indoor heat exchange part (40a) is connected to the first inlet (11), the second indoor heat exchange part (40b) is connected to the second inlet (12), and the third indoor heat exchange part ( 40c) is connected to the first outlet (13), and the fourth indoor heat exchange section (40d) is connected to the second outlet (14),
The control unit (8) switches the flow path switching valve (51) to the second mode when performing cooling operation while suppressing capacity.
Air conditioner.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a second indoor heat exchange section (40b);
A second indoor heat exchange section group (42) including a third indoor heat exchange section (40c) and a fourth indoor heat exchange section (40d) connected in parallel with the third indoor heat exchange section (40c);
The flow path switching valve according to any one of claims 1 to 7, wherein the flow path switching valve is disposed between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42). (51),
Have
The pipe connecting the decompressor (7) and the indoor heat exchanger (40) and the flow path switching valve (51) are connected by a bypass path (61),
The bypass passage (61) is at the first inlet (11), the second indoor heat exchanger (40b) is at the second inlet (12), and the third indoor heat exchanger (40c) is at the first. The fourth indoor heat exchange section (40d) is connected to the second outlet (14) at the first outlet (13),
The control unit (8) switches the flow path switching valve (51) to the second mode when performing cooling operation while suppressing capacity.
Air conditioner.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a four-way selector valve (2), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a first indoor heat exchange section (40a) and a second indoor heat exchange section (40b) connected in parallel with the first indoor heat exchange section (40a);
A second indoor heat exchange section group (42) including a fourth indoor heat exchange section (40d);
The flow path switching valve according to any one of claims 1 to 7, wherein the flow path switching valve is disposed between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42). (51),
Have
The pipe connecting the four-way switching valve (2) and the indoor heat exchanger (40) and the flow path switching valve (51) are connected by a bypass path (71),
The first indoor heat exchanger (40a) is at the first outlet (13), the second indoor heat exchanger (40b) is at the second outlet (14), and the bypass (71) is at the The fourth indoor heat exchange section (40d) is connected to the second inlet (12) at the first inlet (11),
The control unit (8) switches the flow path switching valve (51) to the second mode when performing cooling operation while suppressing capacity.
Air conditioner.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a first indoor heat exchange section (40a) and a second indoor heat exchange section (40b) connected in parallel with the first indoor heat exchange section (40a);
A second indoor heat exchange section group (42) including a third indoor heat exchange section (40c) and a fourth indoor heat exchange section (40d) connected in parallel with the third indoor heat exchange section (40c);
The flow path switching valve according to any one of claims 2 to 4, wherein the flow path switching valve is disposed between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42). (51),
Have
The first indoor heat exchange part (40a) is connected to the first inlet (11), the second indoor heat exchange part (40b) is connected to the second inlet (12), and the third indoor heat exchange part ( 40c) is connected to the first outlet (13), and the fourth indoor heat exchange section (40d) is connected to the second outlet (14),
The control unit (8) switches the flow path switching valve (51) to the first form using the second passage when performing the reheat dehumidification operation.
Air conditioner.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a first indoor heat exchange section (40a);
A second indoor heat exchange section group (42) including a third indoor heat exchange section (40c) and a fourth indoor heat exchange section (40d) connected in parallel with the third indoor heat exchange section (40c);
The flow path switching valve (51) according to claim 6 or 7, arranged between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42),
Have
The pipe connecting the decompressor (7) and the indoor heat exchanger (40) and the flow path switching valve (51) are connected by a bypass path (61),
The first indoor heat exchanger (40a) is at the first inlet (11), the bypass passage (61) is at the second inlet (12), and the third indoor heat exchanger (40c) is at the The fourth indoor heat exchange section (40d) is connected to the second outlet (14) at the first outlet (13),
The control unit (8) switches the flow path switching valve (51) to the first form using the second passage when performing the reheat dehumidification operation.
Air conditioner.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a four-way selector valve (2), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a first indoor heat exchange section (40a) and a second indoor heat exchange section (40b) connected in parallel with the first indoor heat exchange section (40a);
A second indoor heat exchange section group (42) including a third indoor heat exchange section (40c);
The flow path switching valve (51) according to claim 6 or 7, arranged between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42),
Have
The pipe connecting the four-way switching valve (2) and the indoor heat exchanger (40) and the flow path switching valve (51) are connected by a bypass path (71),
The first indoor heat exchanger (40a) is connected to the first outlet (13), the second indoor heat exchanger (40b) is connected to the second outlet (14), and the third indoor heat exchanger ( 40c) is connected to the first inlet (11), and the bypass (71) is connected to the second inlet (12),
The control unit (8) switches the flow path switching valve (51) to the first form using the second passage when performing the reheat dehumidification operation.
Air conditioner.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a first indoor heat exchange section (40a);
A second indoor heat exchange section group (42) including a third indoor heat exchange section (40c) and a fourth indoor heat exchange section (40d) connected in parallel with the third indoor heat exchange section (40c);
The flow path switching valve according to any one of claims 1 to 7, wherein the flow path switching valve is disposed between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42). (51),
Have
The pipe connecting the decompressor (7) and the indoor heat exchanger (40) and the flow path switching valve (51) are connected by a bypass path (61),
The first indoor heat exchanger (40a) is at the first inlet (11), the bypass passage (61) is at the second inlet (12), and the third indoor heat exchanger (40c) is at the The fourth indoor heat exchange section (40d) is connected to the second outlet (14) at the first outlet (13),
The control unit (8) switches the flow path switching valve (51) to the second mode when performing cooling operation while suppressing capacity.
Air conditioner.
An air conditioner using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor (5), a four-way selector valve (2), a condenser, a decompressor (7), and an evaporator,
A control unit (8);
An indoor heat exchanger (40) that becomes the condenser during heating operation and the evaporator during cooling operation;
An outdoor heat exchanger (46) that serves as the evaporator during heating operation and serves as the condenser during cooling operation;
With
The indoor heat exchanger (40)
A first indoor heat exchange section group (41) including a first indoor heat exchange section (40a) and a second indoor heat exchange section (40b) connected in parallel with the first indoor heat exchange section (40a);
A second indoor heat exchange section group (42) including a third indoor heat exchange section (40c);
The flow path switching valve according to any one of claims 1 to 7, wherein the flow path switching valve is disposed between the first indoor heat exchange section group (41) and the second indoor heat exchange section group (42). (51),
Have
The pipe connecting the four-way switching valve (2) and the indoor heat exchanger (40) and the flow path switching valve (51) are connected by a bypass path (71),
The first indoor heat exchanger (40a) is connected to the first outlet (13), the second indoor heat exchanger (40b) is connected to the second outlet (14), and the third indoor heat exchanger ( 40c) is connected to the first inlet (11), and the bypass (71) is connected to the second inlet (12),
The control unit (8) switches the flow path switching valve (51) to the second mode when performing cooling operation while suppressing capacity.
Air conditioner.