Lorentz scored his first goal with the Sharks to put them ahead 2-0 at 18:29 of the second, skating through the slot to tip a point shot from Jaycob Megna.
Sturm shot into an empty net to make it 3-0 at 16:06 of the third. It was the Sharks' first third-period goal this season.
Reimer made 16 saves in the third period to seal the win and his 26th NHL shutout.
"He's got a great perspective," Quinn said. "He's been around a long time, he gives us leadership. When you get that from your goalie, it's a special bonus. And he's an impactful guy in the locker room. Obviously, you see what he did tonight, made some big saves there in the third period. They were pushing, and obviously we're still a little bit fragile. I think it's human nature, you're up 2-0, you tend to back off a little bit. But like I said before the game, all we want to do is find a way to win a hockey game."
NOTES: Sharks forward Nick Bonino missed the game and is day to day because of an upper-body injury. ... San Jose forward Oskar Lindblom received a standing ovation when a video was played to honor his return to Philadelphia. Lindblom played five seasons for the Flyers and returned from Ewing's sarcoma, a form of bone cancer, during the 2020 Stanley Cup Playoffs. The Flyers bought out the final season of Lindblom's contract on July 12, and he signed a two-year contract with the Sharks the next day. ... Flyers forward James van Riemsdyk left the game after blocking a shot by Sharks forward Kevin Labanc with 6:26 remaining in the first. There was no update after the game. ... Konecny and Kevin Hayes were benched in the third period.