Air-conditioning outdoor machine

1. An air-conditioning outdoor machine, comprising:

a bottom housing;

a wall housing enclosed by the bottom housing;

a top sub-plate provided at a top of the wall housing;

a top cover removably mounted on the top sub-plate; and

at least one flow guiding groove configured to drain rainwater and provided at an edge of the top sub-plate,

wherein the bottom housing, the wall housing, and the top sub-plate define an accommodating space of an internal structure of the air-conditioning outdoor machine,

wherein the top sub-plate comprises an observation window that is different from the at least one flow guiding groove and that is configured to provide a view of the accommodating space,

wherein at least part of the observation window is opposite to a fan inside the air-conditioning outdoor machine,

wherein the top sub-plate comprises a cable-control-arrangement-structure configured to accommodate connecting wires, the cable-control-arrangement-structure being an accommodating recess depressed toward the bottom housing, and

wherein the observation window and the cable-control-arrangement-structure are located on opposite ends of the top sub-plate, respectively.

2. The air-conditioning outdoor machine according to claim 1 , wherein the top sub-plate further comprises a fan-support-assembling-region for assembling a fan support structure, and

wherein the fan-support-assembling-region is located between the observation window and the cable-control-arrangement-structure.

3. The air-conditioning outdoor machine according to claim 2 , wherein the fan-support-assembling-region comprises a cooperating portion and a position-limited guiding portion close to the cooperating portion.

4. The air-conditioning outdoor machine according to claim 1 , wherein the at least one flow guiding groove comprises a plurality of flow guiding grooves that are respectively provided at a corner and a side edge of the top sub-plate.

5. The air-conditioning outdoor machine according to claim 1 , wherein the air-conditioning outdoor machine further comprises a support structure connected between the bottom housing and the top sub-plate.

6. The air-conditioning outdoor machine according to claim 5 , wherein the support structure is a sheet metal plate.

7. The air-conditioning outdoor machine according to claim 5 , wherein the support structure, the bottom housing, the wall housing, and the top sub-plate define a space for accommodating a compressor.

8. The air-conditioning outdoor machine according to claim 1 , wherein a position that is at the top cover and corresponds to the observation window is made with a transparent material.