The Swans were beaten 2-1 at West Brom last weekend and will be looking to return to winning ways when they host Arsenal - fresh from their Champions League exit - at the Liberty Stadium on Saturday.
Rangel said: "After losing at West Brom last week this is must win for us.
"We want to win as many games as possible even though we are safe.
"We know it won't be easy, even though we beat them at the Emirates. This is different and we need to get something.
"There is more pressure on them as they are fighting for a Champions League place, but we want to keep picking up points and at home we have done well and won plenty of games.
"The Liberty has always been a fortress for us and it needs to be until the end of the season.
"We have five home games left this season and we want to get as much out of them as we can."
Arsenal will be without Jack Wilshere but Rangel believes the 2-0 win at Bayern Munich in midweek shows the depth of quality in their squad.
He said: "Arsenal are a team with a lot of very good players.
"Santi Cazorla has been a top player for them all season, and Theo Walcott has so much pace and he is scoring plenty of goals.
"Wilshere is out but they have other players doing well like Mikel Arteta.
"They are not just about one player, they are all very comfortable on the ball and it will be a game with a lot chances I think.
"I am sure it will be a great game for the fans but hopefully being at home can make the difference for us."