Heat gun having improved flow effects

Patent metadata

Field	Value
Publication number	US-10094590-B2
Application number	US-201715653627-A
Country	US
Kind code	B2
Filing date	Jul 19, 2017
Priority date	Nov 21, 2016
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A heat gun includes a head portion. The head portion defines a flow passage having an inlet end at one end and an outlet end at another opposite end, and includes an inlet portion, an outlet portion and a flow guiding portion disposed between the inlet and outlet ends. The outlet portion is formed with two long sides and two short sides. The flow guiding portion is disposed between the inlet and outlet portions. The flow passage includes two flow guiding protrusions disposed at the flow guiding portion. The two flow guiding protrusions are disposed oppositely and extend oppositely along the long sides.

First claim

What is claimed is:

1. A heat gun having improved flow effects, includes a head portion, comprising:
the head portion defining a flow passage, wherein the flow passage extends longitudinally along an axis, has an inlet end at one end and an outlet end at another opposite end, and includes an inlet portion, an outlet portion and a flow guiding portion disposed in the flow passage between the inlet and outlet ends, wherein the outlet portion is formed with two long sides and two short sides, with the two long sides opposite one another, with the two short sides opposite one another, wherein the flow guiding portion is disposed between the inlet and outlet portions, wherein the flow passage includes two flow guiding protrusions disposed at the flow guiding portion, wherein the two flow guiding protrusions are disposed oppositely, and wherein the two flow guiding protrusions extend oppositely in a direction transverse to the axis away from each other and from a position adjacent to the inlet portion to a position adjacent to the outlet portion along the two long sides.

2. The heat gun as claimed in claim 1 wherein the flow guiding portion is partitioned by the two flow guiding protrusions and defines a first flow region which extends along a first extension axis, a second flow region which extends along a second extension axis and a third flow region, wherein the third flow region is disposed between the two flow guiding protrusions, wherein the first and third flow region are disposed on opposite sides of one of the two flow guiding protrusions, wherein the second and third flow regions are disposed on opposite sides of another of the two flow guiding protrusions, wherein the third flow region includes a side connected to the first flow region and an opposite side connected to the second flow region, wherein the first flow region extends from a first end which is adjacent to the inlet portion to a second end which is adjacent to the outlet portion and has a gradually reduced cross-section from the first end to the second end, wherein the first flow region has a middle portion which is in the middle between the inlet portion and the outlet portion and which has a radial cross-section about the first extension axis greater than 0.25 times and smaller than 0.4 times of a radial cross-section of the inlet portion about the axis, wherein the second flow region extends from a first end which is adjacent to the inlet portion to a second end which is adjacent to the outlet portion and has a gradually reduced cross-section from the first end to the second end, and wherein the second flow region has a middle portion which is in the middle between the inlet portion and the outlet portion and which has a radial cross-section about the second extension axis greater than 0.25 times and smaller than 0.4 times of the radial cross-section of the inlet portion.

3. The heat gun as claimed in claim 2 , wherein the first flow region has a maximum radial cross-sectional area about the first extension axis which is ⅓ of a maximum radial cross-sectional area of the inlet portion about the axis, and wherein the second flow region has a maximum radial cross-sectional area about the second extension axis which is ⅓ of the maximum radial cross-sectional area of the inlet portion about the axis.

4. The heat gun as claimed in claim 2 , wherein the first flow region has a minimum radial width about the first extension axis greater than a minimum radial cross-section of the third flow region about the axis, and wherein the second flow region has a minimum radial width about the second extension axis greater than the minimum radial width of the third flow region about the axis.

5. The heat gun as claimed in claim 4 , wherein the two flow guiding protrusions include two outer peripheries facing oppositely and converging toward one another in a direction from the outlet portion to the inlet portion.

6. The heat gun as claimed in claim 5 , wherein the first and second extension axes are disposed symmetrically about the axis, and wherein the first extension axis intersects the second extension axis at an included angle greater than 60 degrees and smaller than 160 degrees.

7. The heat gun as claimed in claim 6 , wherein the head portion includes a windshield disposed at the outlet end of the flow passage, wherein the windshield includes first and second partitions and a shield, wherein the first and second partitions each extend parallel to the axis from an end adjacent to the outlet portion to another end, wherein the first and second partitions are disposed parallel to the two long sides, wherein the shield extends transversely to the axis and is disposed adjacent to other ends of the first and second partitions, and wherein the shield includes first, second, and third through holes, with the first through hole located between first and second phantom lines which align with inner sides of the first and second partitions which face oppositely, with the second through hole including a portion located on a right side of the first phantom line and a portion located on a left side of the first phantom line, and with the third through hole including a portion located on a right side of the second phantom line and a portion located on a left side of the second phantom line.

8. The heat gun as claimed in claim 7 , wherein the shield includes fourth and fifth through holes, with the fourth and fifth through holes located outside the first and second phantom lines, with the fourth through hole located on the left side of the first phantom line, and with the fifth through hole located on the right side of the second phantom line.

9. The heat gun as claimed in claim 7 , wherein each long side extends lengthwise of the outlet portion and in a direction transverse to the axis for a length, wherein each short side extends widthwise of the outlet portion and in the direction transverse to the axis for a width, wherein the length is greater than a maximum width of the inlet end, wherein the width is smaller than the maximum width of the inlet end, and wherein a distance between the first and second partitions is greater than the width.

10. The heat gun as claimed in claim 8 , wherein the head portion includes two surfaces disposed oppositely, wherein the two flow guiding protrusions protrude between the two surfaces, and wherein the two surfaces are spaced at a distance greater than or equal to the width.

11. The heat gun as claimed in claim 10 , wherein the two surfaces are disposed parallel to one another.

12. The heat gun as claimed in claim 10 , wherein the two surfaces are inclined from each other such that an included angle formed therebetween is greater than 0 degrees and less than 10 degrees, and wherein a distance between ends of the two surfaces which are adjacent to the inlet portion is greater than a distance between ends of the two surfaces which are adjacent to the outlet portion.

13. The heat gun as claimed in claim 12 , wherein the outlet portion has a first radial cross-sectional area about the axis and the inlet portion has a second radial cross-sectional area about the axis respectively, and wherein the first radial cross-sectional area is greater than 0.8 times and smaller than 1.2 times of the second radial cross-sectional area.

14. The heat gun as claimed in claim 13 , wherein the first radial cross-sectional area is equal to the second radial cross-sectional area.

15. The heat gun as claimed in claim 13 , wherein the first radial cross-sectional area is circular in shape, and wherein the second radial cross-sectional area is quadrilateral in shape.

16. A

Assignees

• Pro Iroda Ind Inc

Inventors

• Chen Wei-Long

Classifications

• F24H3/0423 Primary

  hand-held air guns · CPC title

• F23D14/70

  Baffles or like flow-disturbing devices · CPC title

• F23D14/38

  Torches, e.g. for brazing or heating (nozzles F23D14/48) · CPC title

• F23D14/56

  for spreading the flame over an area, e.g. for desurfacing of solid material, for surface hardening or for heating workpieces · CPC title

• F24H3/12

  with additional heating arrangements · CPC title