As Rosanne Rosannadana would say, you ask a lot of questions.

I boiled this down to

1a) Was there an earlier DC version of the ISS' DC vacuum cleaner ...

1b) ... if so why was it replaced with an AC version?

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

2b) ... if so, what are they like?

I can answer some of these.

1a) Yes, there was an earlier DC version of the ISS vacuum cleaner.

It looked like this...

And ran off of 120 VDC. It was a wet/dry vacuum, and included a hair clipper attachment.

The very best thing about this information source is that it tells us the contact person for the vacuum is named "Bum Jacinto".

Source: JSC-28533 INTERNATIONAL SPACE STATION CATALOGUE OF INTRAVEHICULAR ACTIVITY (IVA) GOVERNMENT FURNISHED EQUIPMENT (GFE) FLIGHT CREW EQUIPMENT (FCE) .

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

Yes.

2b) ... if so, what are they like?

The AC power outlets in the US side of the ISS are < start rant> overly complicated like everything in the ISS and are < end rant> called Utility Outlet Panels, they look like this. The actual "sockets" receive cannon plugs and are behind the two gray threaded caps secured by wires.

Source

A former colleague of mine answered a question about this on quora and provided a picture of the 120 VDC outlets - the blue box on the right.

However, all that being said, there is one of your questions I cannot answer, and that is why the vacuum cleaner was upgraded.

Unless that is, as I said in a comment, because it rides well.

Link to video.

Boiling this down to

1a) Was there an earlier DC version of the ISS' DC vacuum cleaner ...

1b) ... if so why was it replaced with an AC version?

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

2b) ... if so, what are they like?

I can answer some of these.

1a) Yes, there was an earlier DC version of the ISS vacuum cleaner.

It looked like this...

And ran off of 120 VDC. It was a wet/dry vacuum, and included a hair clipper attachment.

The very best thing about this information source is that it tells us the contact person for the vacuum is named "Bum Jacinto".

Source: JSC-28533 INTERNATIONAL SPACE STATION CATALOGUE OF INTRAVEHICULAR ACTIVITY (IVA) GOVERNMENT FURNISHED EQUIPMENT (GFE) FLIGHT CREW EQUIPMENT (FCE) .

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

Yes.

2b) ... if so, what are they like?

The DC power outlets in the US side of the ISS are < start rant> overly complicated like everything in the ISS and are < end rant> called Utility Outlet Panels, they look like this. The actual "sockets" receive cannon plugs and are behind the two gray threaded caps secured by wires.

Source

AC is provided by inverter boxes made by Exeltech.

However, all that being said, there is one of your questions I cannot answer, and that is why the vacuum cleaner was upgraded.

Unless that is, as I said in a comment, because it rides well.

Link to video.

As Rosanne Rosannadana would say, you ask a lot of questions.

I boiled this down to

1a) Was there an earlier DC version of the ISS' DC vacuum cleaner ...

1b) ... if so why was it replaced with an AC version?

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

2b) ... if so, what are they like?

I can answer some of these.

1a) Yes, there was an earlier DC version of the ISS vacuum cleaner.

It looked like this...

And ran off of 120 VDC. It was a wet/dry vacuum, and included a hair clipper attachment.

The very best thing about this information source is that it tells us the contact person for the vacuum is named "Bum Jacinto".

Source: JSC-28533 INTERNATIONAL SPACE STATION CATALOGUE OF INTRAVEHICULAR ACTIVITY (IVA) GOVERNMENT FURNISHED EQUIPMENT (GFE) FLIGHT CREW EQUIPMENT (FCE) .

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

Yes.

2b) ... if so, what are they like?

The AC power outlets in the US side of the ISS are < start rant> overly complicated like everything in the ISS and are < end rant> called Utility Outlet Panels, they look like this. The actual "sockets" receive cannon plugs and are behind the two gray threaded caps secured by wires.

Source

A former colleague of mine answered a question about this on quora and provided a picture of the 120 VDC outlets - the blue box on the right.

However, all that being said, there is one of your questions I cannot answer, and that is why the vacuum cleaner was upgraded.

As Rosanne Rosannadana would say, you ask a lot of questions.

I boiled this down to

1a) Was there an earlier DC version of the ISS' DC vacuum cleaner ...

1b) ... if so why was it replaced with an AC version?

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

2b) ... if so, what are they like?

I can answer some of these.

1a) Yes, there was an earlier DC version of the ISS vacuum cleaner.

It looked like this...

And ran off of 120 VDC. It was a wet/dry vacuum, and included a hair clipper attachment.

The very best thing about this information source is that it tells us the contact person for the vacuum is named "Bum Jacinto".

Source: JSC-28533 INTERNATIONAL SPACE STATION CATALOGUE OF INTRAVEHICULAR ACTIVITY (IVA) GOVERNMENT FURNISHED EQUIPMENT (GFE) FLIGHT CREW EQUIPMENT (FCE) .

2a) Are there “wall sockets” throughout the ISS where it's plugged in...

Yes.

2b) ... if so, what are they like?

The AC power outlets in the US side of the ISS are < start rant> overly complicated like everything in the ISS and are < end rant> called Utility Outlet Panels, they look like this. The actual "sockets" receive cannon plugs and are behind the two gray threaded caps secured by wires.

Source

A former colleague of mine answered a question about this on quora and provided a picture of the 120 VDC outlets - the blue box on the right.

However, all that being said, there is one of your questions I cannot answer, and that is why the vacuum cleaner was upgraded.

Unless that is, as I said in a comment, because it rides well.

Link to video.