Apparatus for separating foreign matter from a gas with a heat exchanger

Claim 3

The apparatus of claim 1 including: a housing having a chamber, said housing having a top wall with a gas inlet opening; said tubular wall being located in the chamber, means mounting said tubular wall on said top wall, said tubular passage being longitudinally aligned with said gas inlet opening, said housing having a gas outlet opening, and means for drawing gas from said chamber through said gas outlet opening whereby gas flows through said tubular passage of the tubular wall into said chamber.

Claim 4

The apparatus of claim 1 including: means surrounding said jacket means providing a gas space around the jacket means.

Claim 5

The apparatus of claim 1 including: sleeve means surrounding said jacket means, said sleeve means having a side wall spaced from said jacket means providing a heat insulating gas chamber, and means mounting said tubular wall and sleeve means on a support.

Claim 6

The apparatus of claim 1 including: means for storing heated fluid; said means for carrying fluid being connected to said means for storing heated fluid.

Claim 7

The apparatus of claim 1 including: sleeve means surrounding said jacket means, said sleeve means having at least one end engageable with said tubular member and a side wall spaced from said jacket means.

Claim 8

The apparatus of claim 1 wherein: said means for supplying fluid to said chamber is connected to one end of said jacket means and said means for carrying fluid from said chamber is connected to the other end of said jacket means.

Claim 9

The apparatus of claim 1 wherein: said annular means has an inner annular flange located concentric with said gas outlet end of the tubular passage and axially aligned with said tubular passage, said flange having a lip located adjacent the outlet end of the tubular wall, said lip having a diameter smaller than the diameter of said tubular passage and forming with said tubular wall an annular throat whereby foreign matter collected on said wall moves along said wall to the annular means, and drain means to allow collected foreign matter to drain from said annular means to a desired location.

Claim 10

The apparatus of claim 1 wherein: said second means comprises a plurality of helical elements, each helical element having a diameter substantially the same as the diameter of said tubular passage, said helical elements being located in end-to-end relation and having the same twist direction.

Claim 11

The apparatus of claim 9 wherein: each helical element has about 180 degree twist, each helical element terminating in an edge located circumferentially about 90 degrees relative to the leading edge of the adjacent helical element whereby when gas and foreign matter flows through said tubular passage, the gas and foreign matter is divided into separate streams at each leading edge of a helical element and follows a generally helical path during the flow thereof to said tubular passage.

Claim 12

The apparatus of claim 1 wherein: said jacket means has a generally spiral rib means projected inwardly toward the tubular wall.

Claim 13

The apparatus of claim 11 wherein: said rib means is spaced from the tubular wall.

Claim 16

The apparatus of claim 13 including: means surrounding said jacket providing a space around said jacket.

Claim 17

The apparatus of claim 13 including: sleeve means surrounding said jacket, said sleeve means having a side wall spaced from said jacket to provide a heat insulating gas chamber.

Claim 18

The apparatus of claim 13 wherein: said wall of the first means is a tube having said passage, said tube having a circular open outlet end open to said passage.

Claim 19

The apparatus of claim 16 wherein: said second means comprises a plurality of helical elements, each helical element having a diameter substantially the same as the diameter of the tubular passage, said helical element being located in end-to-end relation and having the same twist direction.

Claim 20

The apparatus of claim 16 wherein: said jacket has a generally spiral rib projected inwardly toward the tube.

Claim 21

The apparatus of claim 18 wherein: said rib is spaced from said tube.

Claim 22

A hood assembly for use with cooking equipment for collecting gas and foreign matter and separating the foreign matter from the gas and transferring heat from the gas to a fluid comprising: housing means having generally horizontal wall structure defining a chamber having an open forward side for receiving gas and foreign matter from the cooking equipment, said wall structure having a plurality of openings, a plurality of gas cleaning units located in said chamber below said openings, each of said units having an uninterrupted fluid impervious heat conducting tubular wall forming a tubular passage, said tubular wall having an inlet end open to said passage and an opening in the wall structure, and an outlet end open to said passage, means mounting said cleaning unit on said wall structure, means for moving gas and foreign matter through said passage of each unit and exhausting said gas externally of the hood assembly, each gas cleaning unit having means located in said passage along the longitudinal length thereof to direct gas and foreign matter flowing through said passage in a generally helical path extended from the gas inlet end to the gas outlet end thereof, said foreign matter entrained in the gas being collected on said wall, said collected foreign matter moving along said wall toward the gas outlet end of the passage, annular means fixed with respect to said wall to collect foreign matter that moves from the outlet end of said passage and permits clean gas to pass centrally thereof, jacket means surrounding the tubular wall providing chamber means accommodating said fluid, said fluid being located in engagement with said tubular wall whereby heat from said wall is transferred to said fluid, said jacket means having opposite ends secured to the tubular wall adjacent the gas inlet and outlet ends thereof, said jacket means having a general spiral shape along the length thereof providing said chamber means with a spiral passage for carrying fluid and directing the flow of fluid around and along the length of the tubular wall whereby the tubular wall is cooled and the temperature of the gas in the passage adjacent the inside surface of the tubular wall is lowered to enhance condensation of gases into liquids which collect on said inside surface of the tubular wall, means for supplying fluid to said chamber means, and means for carrying fluid from said chamber means to a desired location.

Claim 23

A hood assembly for use with cooking equipment for collecting gas and foreign matter and separating the foreign matter from the gas and transferring heat from the gas to a fluid comprising: housing means having generally horizontal wall structure defining a chamber having an open forward side for receiving gas and foreign matter from the cooking equipment, said wall structure having a plurality of openings, a plurality of gas cleaning units located in said chamber below said openings, each of said units having an uninterrupted fluid impervious heat conducting tubular wall forming a tubular passage, said tubular wall having an inlet end open to said passage and an opening in the wall structure, and an outlet end open to said passage, means mounting said cleaning unit on said wall structure, means for moving gas and foreign matter through said passage of each unit and exhausting said gas externally of the hood assembly, each gas cleaning unit having means located in said passage along the longitudinal length thereof to direct gas and foreign matter flowing through said passage in a generally helical path extended from the gas inlet end to the gas outlet end thereof, said foreign matter entrained in the gas being collected on said wall, said collected foreign matter moving along said wall toward the gas outlet end of the passage, annular means fixed with respect to said wall to collect foreign matter that moves from the outlet end of said passage and permits clean gas to pass centrally thereof, jacket means surrounding the tubular wall providing chamber means accommodating said fluid, said fluid being located in engagement with said tubular wall whereby heat from said wall is transferred to said fluid, said jacket means having opposite ends secured to the tubular wall adjacent the gas inlet and outlet ends thereof, said jacket means having a general spiral shape along the length thereof providing said chamber means with a spiral passage for carrying fluid and directing the flow of fluid around and along the length of the tubular wall whereby the tubular wall is cooled and the temperature of the gas in the passage adjacent the inside surface of the tubular wall is lowered to enhance condensation of gases into liquids which collect on said inside surface of the tubular wall, means for supplying fluid to said chamber means, and means for carrying fluid from said chamber means to a desired location.

Claim 24

The apparatus of claim 20 wherein: said means located in the passage comprises a plurality of helical elements, each helical element having a diameter substantially the same as the diameter of the tubular passage, said helical element being located in end-to-end relation and having the same twist direction.

Claim 25

The apparatus of claim 20 including: means surrounding said jacket means providing a space around said jacket means.

Claim 26

The apparatus of claim 20 including: sleeve means surrounding said jacket means, said sleeve means having a side wall spaced from said jacket means to provide a heat insulating gas chamber.

Claim 27

The apparatus of claim 20 wherein: said jacket has a generally spiral rib projected inwardly toward the tubular wall.

Claim 28

The apparatus of claim 24 wherein: said rib is spaced from said tubular wall.