Air conditioning apparatus

1. An air conditioning apparatus comprising:

a compression mechanism;

a heat source-side heat exchanger having a first vertical side facing a first lateral direction, a second vertical side spaced from the first vertical side and facing a second lateral direction, and a bottom surface extending between bottom ends of the first and second vertical sides;

an expansion mechanism;

a usage-side heat exchanger;

a blower arranged and configured to feed an air flow to said heat source-side heat exchanger, the blower being disposed adjacent to the first vertical side of the heat exchanger and spaced from the first vertical side of the heat exchanger in the first lateral direction;

housings including a bottom plate having an upper surface, said housings being arranged and configured to accommodate said heat source-side heat exchanger and said blower in a space above said bottom plate; and

a bypass circuit disposed so as to pass below said blower and below said heat source-side heat exchanger, said bypass circuit extending along said bottom surface of said heat source-side heat exchanger and extending along said upper surface of said bottom plate such that said bypass circuit is below said heat source-side heat exchanger, said bypass circuit including a first section and a second section, the first section passing below said blower from a third refrigerant tube, and the second section passing below said heat source-side heat exchanger from the first section and extending to the at least one of a first refrigerant tube and a second refrigerant tube, the first section spaced from the second section in the first lateral direction, and said bypass circuit being arranged and configured to bypass

said third refrigerant tube on a discharge side of said compression mechanism, and

at least one of

said first refrigerant tube extending from said usage-side heat exchanger to said expansion mechanism, and

said second refrigerant tube extending from said expansion mechanism to said heat source-side heat exchanger.

2. The air conditioning apparatus according to claim 1 , wherein

said bottom plate does not have an opening penetrating therethrough in a plate-thickness direction in a portion positioned on a side of said blower with respect to said heat source-side heat exchanger as seen in a planar view.

3. The air conditioning apparatus according to claim 1 , wherein

said bottom plate has drainage ports penetrating therethrough in a plate-thickness direction below said heat source-side heat exchanger.

4. The air conditioning apparatus according to claim 1 , rein

said heat source-side heat exchanger has

a compression mechanism-side refrigerant passage port on a side of said compression mechanism,

an expansion mechanism-side refrigerant passage port on a side of said expansion mechanism, and

heat exchange flow passages extending so as to exchange heat between an outside liquid and refrigerant that passes therethrough from said compression mechanism-side refrigerant passage port to said expansion mechanism-side refrigerant passage port, and said heat exchange flow passages include

a first branch point,

a second branch point provided closer to said expansion mechanism-side refrigerant passage port than said first branch point,

a first and second branch tubes arranged and configured to connect said first branch point and said second branch point by an independent path, and

a juncture tube connecting said second branch point and said expansion mechanism-side refrigerant passage port and passing below at least one of said first branch tube and said second branch tube.

5. The air conditioning apparatus according to claim 4 , wherein

said heat source-side heat exchanger further has a fin penetrated therethrough by said juncture tube and at least one of

said first branch tube and

said second branch tube, and

a penetrating portion of the at least one of said first branch tube and said second branch tube penetrating through said fin, and a penetrating portion of said juncture tube penetrating through said fin are connected.

6. The air conditioning apparatus according to claim 1 , wherein

at least a portion of said bottom plate adjacent to a portion through which said bypass circuit passes has bypass gutters formed so as to sink downward; and

at least a portion of said bypass circuit is disposed on a top side of said bypass gutters in a space lower than a periphery of said bypass gutters.

7. The air conditioning apparatus according to claim 6 , wherein

said bypass gutters have inclined portions; and

said bottom plate has gutter openings penetrating therethrough in a plate-thickness direction adjacent to a bottom end of the inclined portions of said bypass gutters.

8. The air conditioning apparatus according to claim 7 , wherein

said bypass circuit has a portion that is inclined so that a part of said bypass circuit passing above said gutter openings is a bottom end of said bypass circuit.

9. The air conditioning apparatus according to claim 7 , wherein

at least a part of a portion of said bypass circuit passing below said heat source-side heat exchanger is positioned above said gutter openings.

10. The air conditioning apparatus according to claim 1 , further comprising:

a connection switching valve connected to an end part of said third refrigerant tube on a side opposite from said compression mechanism; wherein

said connection switching valve is switchable between

a first connection state in which refrigerant discharged from said compression mechanism is directed toward said usage-side heat exchanger, and

a second connection state in which refrigerant discharged from said compression mechanism is directed toward said heat source-side heat exchanger.

11. The air conditioning apparatus according to claim 1 , wherein

said bypass circuit has a depressurizing mechanism arranged and configured to reduce pressure of refrigerant passing through the bypass circuit, and

said bypass circuit bypasses

the second refrigerant tube that extends from said expansion mechanism to said heat source-side heat exchanger, and

the third refrigerant tube on the discharge side of said compression mechanism.

12. The air conditioning apparatus according to claim 1 , wherein:

said bypass circuit extends along said upper surface of said bottom plate such that said bypass circuit is below said blower,

said bypass circuit is arranged and configured to connect the third refrigerant tube and at least one of the first refrigerant tube and the second refrigerant tube, and

the air conditioning apparatus further includes a bypass switching part switchable between

a state of allowing flow of refrigerant from the third refrigerant tube to at least one of the first refrigerant tube and the second refrigerant tube in said bypass circuit and

a state of not allowing the flow of refrigerant in said bypass circuit.

13. The air conditioning apparatus according to claim 12 , further comprising:

a switch controller arranged and configured to switch said bypass switching part to the state of allowing flow of refrigerant in said bypass circuit in a case in which a defrost operation is performed to remove frost that adheres to said heat source-side heat exchanger.

14. The air conditioning apparatus according to claim 1 , wherein

the bypass circuit passes through both

a position within a downward projection of the heat source-side heat exchanger and

a position within a downward projection of the blower.