CN108087873B - Hot air gun capable of improving flow guide effect - Google Patents
Hot air gun capable of improving flow guide effect Download PDFInfo
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- CN108087873B CN108087873B CN201611047030.3A CN201611047030A CN108087873B CN 108087873 B CN108087873 B CN 108087873B CN 201611047030 A CN201611047030 A CN 201611047030A CN 108087873 B CN108087873 B CN 108087873B
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- flow
- partition plate
- radial direction
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- virtual axis
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
Abstract
The invention provides a hot air gun for improving a flow guiding effect, which comprises a head part, wherein a flow guiding channel is arranged in the head part along the axial direction of a virtual axis, the flow guiding channel is provided with an inlet end and an outlet end different from the inlet end, an input part, an output part and a flow guiding part are arranged between the inlet end and the outlet end of the flow guiding channel, the output part is provided with two long sides and two short sides, the two long sides are not adjacent and are opposite to each other, the two short sides are not adjacent and are opposite to each other, the flow guiding part is arranged between the input part and the output part, the flow guiding channel is provided with two flow guiding flanges on the flow guiding part, the two flow guiding flanges are respectively adjacent to the two long sides and are opposite to each other, and the hot air gun enables the velocity distribution of outlet air to be uniform.
Description
Technical Field
The present invention relates to a hot air gun, and more particularly to a hot air gun with improved flow guiding effect.
Background
With reference to the european patent EP1795803a2, a "modular gas combustion hand tool" is disclosed, which comprises a body (3) provided longitudinally with a duct (7) for circulating gas through and supporting a handle (5), and said body (3) extending with a burner part (9), generally hollow, provided at its end with gas combustion means (11) and communicating with the duct (7). The burner part (9) has a connection part (13) opposite to said combustion device (11), the body (3) also having a connection part (15), the connection points of the connection parts (13,15) being detachably connected to one another.
The conventional gas hot air gun uses high pressure gas and mixes with a venturi tube. The gas nozzle sprays high-speed gas in the venturi under high pressure, so that the gas drives external air to achieve a proper gas mixing ratio in the venturi and the fire-jet cavity and improve the gas mixing flow. The other end of the venturi is provided with a hollow rectifying gas mixing cavity, and a rectifying shield is arranged outside the gas mixing cavity to control the flow rate and the uniformity of the mixed gas and prevent flame from backflowing. The flame speed of the outlet of the ideal high-power gas hot air gun is easy to aim at a heating target when the flame speed is high, and the width of the flame opening of the hot air gun is required to be wider and better so as to achieve the purposes of accurate operation and large-area heating in a short time.
However, the traditional high-power hot air gun has the following disadvantages due to the poor design of the flow channel and the fire-jet cavity, including:
1. the outlet of the flame fire hole is not uniform, so that the uniform heating cannot be realized.
2. The phenomenon of poor combustion due to uneven gas mixing and gas outlet not only reduces the combustion efficiency and wastes gas, but also generates excessive toxic carbon monoxide (CO) and nitrogen oxides (NOx) in the use process.
3. Because the temperature of the flame outlet is extremely high, large heat is concentrated, and the appearance temperature of the flame outlet cavity is extremely high and reaches over one hundred ℃ often under the action of radiant heat and conduction, so that the risk of scalding caused by mistaken touching is high.
4. The pressure loss is too large due to the fact that the outlet of the rectifying shield is too small, the overall flow is reduced, and the heat value power cannot be improved.
5. The high-pressure gas and the mixed gas generate excessive turbulence in the gas mixing cavity and the rectification shield, and generate excessive noise.
6. Excessive rectification makes the flame velocity of flame mouth flame flow low excessively, because the flame direction is the level to mostly when the hot-blast rifle is operated, can make heating flame upwards drift and can't aim at the target when receiving the influence of hot buoyancy if the flame velocity of flow is low excessively. Outdoor use is more susceptible to interference from ambient air flow, is not accurately aligned for operation in windy environments, and is more likely to produce dangerous conditions of reverse flame burning toward the operator due to low flame flow rate in non-directional winds or headwind.
7. The mixed gas and the discharged gas are unstable, the range of the pressure suitable for gas supply is small, and the ignition rate is greatly reduced if the pressure of the gas changes.
The reason is that the traditional mixed air cavity is in a fan shape, the section of the mixed air cavity along the axis of the venturi tube is regularly changed, and the instantaneous heating area needs to be enlarged and the heat value power of the hot air gun needs to be improved in order to accelerate the operation time in practical application, so the width of the outlet of the mixed air cavity cannot be too narrow. When the width of the outlet of the mixed flow cavity is increased, the design can not control the outlet flow velocity to be uniform at the outlet, which often causes that the flow velocity at two sides of the fire outlet is fast and the flow velocity at the middle is low (for example, an accessory I, which is a thermal image picture and a photo actually used by the traditional gas hand tool). If when reducing mixed flow chamber exit width, the heating area is less under the same operating distance, can make the heat concentrate the little region if increasing calorific value power, causes overheated, if lengthen the distance then because of the interference of hot buoyancy and air flow makes the operator be difficult to aim at the heating region. Therefore, the width of the flame opening of the high-power hot air gun must be wider and better, the flame speed of the outlet is high, and the uniformity is required to achieve the purposes of accurate operation and uniform heating.
In addition to the noise, the phenomenon of uneven heating of two high sides at two sides is caused, and the alignment direction and the heating position are not matched in practical application due to the fact that the flame is close to transparency and the heat flow direction cannot be judged, so that the condition that the two sides are overheated due to insufficient heating of the alignment area is caused. Meanwhile, because the flow velocity is uneven, when the heat is increased, the two ends are easy to leave the fire to cause incomplete combustion. However, attempts to control with baffles tend to increase the friction between the fluids, reducing overall flow and efficiency.
And because the large heat is concentrated, the temperature of the fire outlet flame port is extremely high, the fire outlet flame port is influenced by radiant heat and conduction, the appearance temperature of a common fire spraying port cavity is extremely high and is usually over one hundred ℃, and the risk of accidental scalding is high. Even if the burning is stopped, the burner still stands for a period of time to wait for cooling, so that the user cannot judge the high temperature, and the burn is easily touched by mistake.
Taking the conventional gas hand tool as an example, please refer to fig. 11, which is a schematic diagram illustrating a use state of the conventional gas hand tool. The gas hand tool adopting the structure has the advantages that the end part is provided with the gas combustion device 11 ', the gas combustion device 11 ' is net-shaped, the pipeline in the main body is in a circular pipe shape, the flow speed of the combustion gas is faster at the position closer to the center when the combustion gas flows in the pipeline, the flow speed distribution of the combustion gas can still maintain the trend when the combustion gas passes through the main body and flows to the combustor part 9 ', when the combustion gas contacts the gas combustion device 11 ', the combustion gas can not pass through the gas combustion device in all times and can be blocked to change the flow direction, the flow speed of the combustion gas in the center of the combustor part 9 ' is faster, the combustion gas can flow to the directions of the two sides in the combustor part 9 ' after being blocked, the two sides of the combustion gas in the combustor part 9 ' have more flow and the center is less, the temperature of hot air blown out by the gas hand tool is uneven, the temperature of the two sides is, moreover, the temperature of the burner part 9' is very high after the gas hand tool is used, and the user cannot judge the temperature by the appearance, so that the user is easy to scald by touching the burner by mistake.
Disclosure of Invention
The invention provides a hot air gun with improved flow guiding effect, which mainly aims to provide a hot air gun with improved flow guiding effect and solve the technical problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a promote hot-blast rifle of water conservancy diversion effect which characterized in that, including: a head, be provided with a water conservancy diversion passageway along the axial of a virtual axis in this head, this water conservancy diversion passageway has an entry end and an exit end that is different from this entry end, this water conservancy diversion passageway is provided with an input part between this entry end and this exit end, an output and a water conservancy diversion portion, this output is formed with two long limits and two minor faces, these two long limits are not adjacent and relative each other, these two minor faces are not adjacent and relative each other, this water conservancy diversion portion sets up between this input part and this output, this water conservancy diversion passageway is provided with two water conservancy diversion flanges in this water conservancy diversion portion, these two water conservancy diversion flanges are adjacent each other with these two long limits respectively, and these two water conservancy diversion flanges are relative each other.
The guide part is formed with a first flow area axially extending along a first virtual extension line, a second flow area axially extending along a second virtual extension line and a third flow area by taking the two guide flanges as a boundary, the first flow area and the second flow area are respectively arranged at two different sides of the guide flanges, the third flow area is arranged between the two guide flanges, one side of the third flow area is connected with the first flow area, the other different side of the third flow area is connected with the second flow area, the cross-sectional area of the first flow area along the radial direction of the first virtual extension line is gradually reduced from one end adjacent to the input part to one end adjacent to the output part, the cross-sectional area of the first flow area along the radial direction of the first virtual extension line from the input part to the middle point of the output part along the radial direction of the first virtual extension line is larger than 0.25 times and smaller than 0.4 times of the cross-sectional area of the input part along the radial direction of the virtual axis, and the cross-sectional area of the second flow area along the radial direction of the second virtual extension line from one end adjacent to the input part along the radial direction One end of the outlet part is tapered, and the cross-sectional area of the second flow area from the input part to the middle point of the output part along the radial direction of the second virtual extension line is more than 0.25 times and less than 0.4 times of the cross-sectional area of the input part along the radial direction of the virtual axis.
The maximum sectional area of the first flow area along the radial direction of the first virtual extension line is one third of the sectional area of the input part along the radial direction of the virtual axis, and the maximum sectional area of the second flow area along the radial direction of the second virtual extension line is one third of the sectional area of the input part along the radial direction of the virtual axis.
The minimum width of the first flow area along the radial direction of the first virtual extending line and the minimum width of the second flow area along the radial direction of the second virtual extending line are larger than the minimum width of the third flow area along the radial direction of the virtual axis.
The first virtual extension line and the second virtual extension line pass through the virtual axis and are symmetrical by taking the virtual axis as a reference, and an included angle between the first virtual extension line and the second virtual extension line forms a diffusion angle which is larger than 60 degrees and smaller than 160 degrees.
The hot air gun comprises a fan cover, the fan cover is arranged at the head and located at the outlet end of the flow guide channel, the fan cover comprises a first partition plate, a second partition plate and a cover body, the first partition plate and the second partition plate are arranged at the outlet end of the flow guide channel, the first partition plate and the second partition plate extend in the direction parallel to the axial direction of the virtual axis and the direction of the long edge, the cover body extends in the radial direction of the virtual axis and is arranged on one side, different from the output part, of the first partition plate and the second partition plate, a first through hole, a second through hole and a third through hole penetrate through the cover body, the first through hole is located between the first partition plate and the second partition plate, the second through hole corresponds to the first partition plate and is located on one side, different from the output part, of the first partition plate in the direction parallel to the axial direction of the virtual axis, and the third through hole corresponds to the second partition plate and is located on one side, different from the output part, different from the second partition plate in the direction parallel to the axial direction of the virtual axis.
The cover body is provided with a fourth through hole and a fifth through hole in a penetrating mode, the fourth through hole is located on one side, different from the second partition plate, of the first partition plate, and the fifth through hole is located on one side, different from the first partition plate, of the second partition plate.
The outer peripheries of the diversion flange adjacent to two different sides of the two short sides are close to each other from the output part to the input part and are tapered.
The outer peripheries of the diversion flanges adjacent to two different sides of the two short sides are provided with non-planar profiles.
The long edge is provided with a long edge length along the direction parallel to the radial direction of the virtual axis, the short edge is provided with a short edge width along the direction parallel to the radial direction of the virtual axis, the long edge length is greater than the maximum width of the inlet end of the flow guide channel, and the short edge width is less than the minimum width of the inlet end of the flow guide channel.
One side of each of the two diversion flanges adjacent to each other is provided with a top surface, and the distance between the two top surfaces is larger than or equal to the width of the short edge.
The distance between the two top surfaces is equal to the width of the short side.
The two top surfaces can be parallel to each other or form an included angle between the two top surfaces which is larger than 0 degree and smaller than 10 degrees, and the distance between the two top surfaces on the side adjacent to the input part is larger than the distance between the two top surfaces on the side adjacent to the output part.
The distance between the first clapboard and the second clapboard is larger than the width of the short edge.
The cross-sectional area of the output portion in the radial direction of the virtual axis is greater than 0.8 times and less than 1.2 times the cross-sectional area of the input portion in the radial direction of the virtual axis.
The cross-sectional area of the output portion in the radial direction of the virtual axis is equal to the cross-sectional area of the input portion in the radial direction of the virtual axis.
The input part is circular along the radial section of the virtual axis, and the output part is quadrilateral along the radial section of the virtual axis.
Compared with the prior art, the invention has the beneficial effects that: the flow guide channel of the hot air gun is combined with the design of three geometric characteristics, the pressure and the flow field in the gas mixing cavity are effectively controlled by means of the flow guide matching section change of the curved surface of the gas mixing cavity, the generation of backflow and turbulence can be greatly reduced, the combustion efficiency is promoted, the noise is effectively reduced, the pressure drop is reduced, the overall flow is promoted under the same condition of gas supply pressure, and meanwhile, the velocity distribution of the gas flow at the outlet is uniform, so that the combustion condition is easy to control, the pressure range adapting to gas supply is enlarged, and the ignition rate is not easily influenced even when the gas supply pressure is changed.
Drawings
Fig. 1 is a perspective view of a heat gun with improved airflow guiding effect.
Fig. 2 is an exploded perspective view of the heat gun head for improving the flow guiding effect according to the present invention.
FIG. 3 is a cross-sectional view of the heat gun head for improving the air-guiding effect according to the present invention.
FIG. 4 is a cross-sectional view of the heat gun head with improved air flow guiding effect.
Fig. 5 is a sectional structure view of the fan housing of the heat gun for improving the flow guiding effect according to the present invention.
FIG. 6 is a cross-sectional view of the heat gun output part along the radial direction of the virtual axis for improving the flow guiding effect.
FIG. 7 is a cross-sectional view of the air-guiding portion of the heat gun along the radial direction of the virtual axis for improving the air-guiding effect.
FIG. 8 is a view showing a state of the heat gun with improved airflow guiding effect.
FIG. 9 is a view showing a state of the heat gun with improved air flow guiding effect.
FIG. 10 is a view showing a state of the heat gun with improved airflow guiding effect.
Fig. 11 is a schematic view showing a state of use of a conventional gas-fired hand tool.
Description of reference numerals: 10 hot air gun; 20 a head portion; 21 a flow guide channel; 211 an inlet end; 212 an outlet end; 213 an input unit; 214 an output section; 215 a flow guide part; 216 long side; 217 short side; 22 a flow directing flange; a top surface 221; 23 a first flow zone; 24 a second flow zone; 25 a third flow zone; 30 wind shields; 31 a first separator; 32 a second separator plate; 33 a cover body; 331 a first through hole; 332 a second via hole; 333 third via holes; 334 a fourth through hole; 335 a fifth through hole; 9' a burner section; 11' a gas combustion device; an L virtual axis; d, length of a long side; w short side width; a diffusion angle; c1 first virtual extension line; c2 second virtual extension line.
Detailed Description
Fig. 1 and 2 are perspective views of a heat gun with improved flow guiding effect and an exploded perspective view of a head portion according to the present invention. The heat gun 10 of the present invention comprises a head 20 and a hood 30; wherein:
fig. 3 to 5 are schematic cross-sectional views of a heat gun head, a heat gun hood and a heat gun according to the present invention. A flow guide channel 21 is axially disposed along a virtual axis L in the head portion 20, the flow guide channel 21 has an inlet end 211 and an outlet end 212 different from the inlet end 211, an input portion 213, an output portion 214 and a flow guide portion 215 are disposed between the inlet end 211 and the outlet end 212 of the flow guide channel 21, a cross-sectional area of the output portion 214 along the virtual axis L is greater than 0.8 times and less than 1.2 times of a cross-sectional area of the input portion 213 along the virtual axis L, and the cross-sectional area of the output portion 214 along the virtual axis L is equal to the cross-sectional area of the input portion 213 along the virtual axis L.
Please refer to fig. 6 and 7, which are a cross-sectional structure diagram of the heat gun output part along the radial direction of the virtual axis and a cross-sectional structure diagram of the air guiding part along the radial direction of the virtual axis for improving the air guiding effect according to the present invention. The radial cross section of this input 213 along this virtual axis L is circular, this output 214 is the quadrangle along the radial cross section of this virtual axis L, this output 214 is formed with two long sides 216 and two short sides 217, these two long sides 216 are not adjacent and relative to each other, these two short sides 217 are not adjacent and relative to each other, this long side 216 has a long side length D along the radial direction of this virtual axis L that is parallel to, this short side 217 has a short side width W along the radial direction of this virtual axis L that is parallel to, this long side length D is greater than the maximum width of this water conservancy diversion passageway 21 entry end 211, this short side width W is less than the minimum width of this water conservancy diversion passageway 21 entry end 211.
The flow guiding portion 215 is disposed between the input portion 213 and the output portion 214, the flow guiding channel 21 is disposed with two flow guiding flanges 22 at the flow guiding portion 215, the two flow guiding flanges 22 are respectively adjacent to the two long sides 216, and the two flow guiding flanges 22 are opposite to each other, one sides of the two flow guiding flanges 22 adjacent to each other are respectively disposed with a top surface 221, a minimum distance between the two top surfaces 221 is greater than or equal to the short side width W, the minimum distance between the two top surfaces 221 is equal to the short side width W in the present embodiment, the two top surfaces 221 can be parallel to each other or form an included angle greater than 0 degree and less than 10 degrees therebetween, so that a distance between one sides of the two top surfaces 221 adjacent to the input portion 213 is greater than a distance between one sides of the two top surfaces 221 adjacent to the output portion 214.
The outer peripheries of the diversion flange 22 adjacent to the two different sides of the two short sides 217 are close to each other from the output portion 214 to the input portion 213 and taper, so that the diversion portion 215 has a shape with two slightly wider ends and a slightly narrower center along the radial section of the virtual axis L, and the outer peripheries of the diversion flange 22 adjacent to the two different sides of the two short sides 217 have a non-planar profile.
The flow guiding portion 215 is defined by the two flow guiding flanges 22 to form a first flow area 23 extending axially along a first virtual extension line C1, a second flow area 24 extending axially along a second virtual extension line C2, and a third flow area 25, the first virtual extension line C1 and the second virtual extension line C2 pass through the virtual axis L and are symmetrical with respect to the virtual axis L, an included angle between the first virtual extension line C1 and the second virtual extension line C2 forms a diffusion angle a, the diffusion angle a is greater than 60 degrees and less than 160 degrees, so that the spatial combination of the input portion 213, the first flow area 23, and the second flow area 24 is generally Y-shaped. The first flow area 23 and the second flow area 24 are respectively located at two different sides of the flow guiding flange 22, the third flow area 25 is located between the two flow guiding flanges 22, one side of the third flow area 25 is connected to the first flow area 23 and the other different side is connected to the second flow area 24.
The cross-sectional area of the first flow area 23 along the first virtual extension line C1 is gradually decreased from the end adjacent to the input portion 213 to the end adjacent to the output portion 214, the cross-sectional area of the first flow area 23 along the first virtual extension line C1 from the input portion 213 to the midpoint of the output portion 214 is greater than 0.25 times and less than 0.4 times the cross-sectional area of the input portion 213 along the virtual axis L, and the cross-sectional area of the first flow area 23 along the first virtual extension line C1 from the input portion 213 to the midpoint of the output portion 214 is one third of the cross-sectional area of the input portion 213 along the virtual axis L. The cross-sectional area of the second flow region 24 along the second imaginary extension line C2 is tapered from the end adjacent to the input portion 213 to the end adjacent to the output portion 214, the cross-sectional area of the second flow area 24 from the input 213 to the midpoint of the output 214 along the second virtual extension C2 is greater than 0.25 times and less than 0.4 times the cross-sectional area of the input 213 along the virtual axis L, the cross-sectional area of the second flow area 24 from the middle point of the input portion 213 to the output portion 214 along the second virtual extension line C2 is one third of the cross-sectional area of the input portion 213 along the virtual axis L, the minimum width of the first flow zone 23 along the radial direction of the first imaginary extension line C1 and the minimum width of the second flow zone 24 along the radial direction of the second imaginary extension line C2 are greater than the minimum width of the third flow zone 25 along the radial direction of the imaginary axis L, the size and angle of the first flow area 23 and the second flow area 24 can vary depending on the flow rate and mixing requirements.
The fan housing 30 is disposed on the head portion 20 and located at the outlet end 212 of the flow guide channel 21, the fan housing 30 includes a first partition plate 31, a second partition plate 32 and a cover body 33, the first partition plate 31 and the second partition plate 32 are disposed at the outlet end 212 of the flow guide channel 21, the first partition plate 31 and the second partition plate 32 extend in a direction parallel to the virtual axis L and the long side 216, and a distance between the first partition plate 31 and the second partition plate 32 is greater than the short side width W.
The cover 33 is disposed on a side of the first partition plate 31 and the second partition plate 32 different from the output portion 214 along the virtual axis L in a radially extending manner, the cover 33 is provided with a first through hole 331, a second through hole 332 and a third through hole 333 in a penetrating manner, the first through hole 331 is located between the first partition plate 31 and the second partition plate 32, the second through hole 332 corresponds to the first partition plate 31 and is located on a side of the first partition plate 31 different from the output portion 214 along a direction parallel to the virtual axis L, and the third through hole 333 corresponds to the second partition plate 32 and is located on a side of the second partition plate 32 different from the output portion 214 along a direction parallel to the virtual axis L. The cover 33 is provided with a fourth through hole 334 and a fifth through hole 335 in a penetrating manner, the fourth through hole 334 is located on a side of the first partition board 31 different from the second partition board 32, and the fifth through hole 335 is located on a side of the second partition board 32 different from the first partition board 31.
Fig. 8 to 10 are schematic views of a heat gun with improved airflow guiding effect according to the present invention. When the heat gun 10 is used, gas is ignited inside the gun body to heat air, and then hot air is blown out from the head 20.
By means of the design of the two guiding flanges 22 disposed in the guiding channel 21, the guiding portion 215 is designed to combine three geometric features, so as to slow down the flow velocity of the gas and the hot air in the central region of the guiding portion 215, to average the flow velocity of the central region and the edge region of the guiding portion 215, to ensure that the gas and the hot air in the guiding portion 215 can flow to the output portion 214 at a constant velocity, to enable the hot air gun 10 to blow out hot air with uniform temperature (as shown in fig. 8), and to avoid the problem of heat concentration at the center or both sides. The pressure and the flow field in the gas mixing cavity are effectively controlled by means of the flow guide matching section change of the curved surface of the gas mixing cavity, the generation of backflow and turbulence can be greatly reduced, the combustion efficiency is promoted, the noise is effectively reduced, the pressure drop is reduced, the overall flow is promoted under the same condition of gas supply pressure, and the gas flow speed at the outlet is uniformly distributed, so that the combustion condition is easy to control, the pressure range adapting to gas supply is enlarged, and the ignition rate is not easily influenced even when the gas supply pressure is changed.
In addition, since the fan housing 30 adopts a structure that the second through hole 332 corresponds to the first partition plate 31 and the third through hole 333 corresponds to the second partition plate 32, the interior of the fan housing 30 can be divided into three regions, the gas and the hot air blown out from the output portion 214 can be formed into three states by the regions, the first through hole 331, the second through hole 332 and the third through hole 333, the gas and the hot air mainly flow between the first partition plate 31 and the second partition plate 32 and mainly flow out from the first through hole 331, the gas and the hot air adjacent to the first partition plate 31 or the second partition plate 32 can flow out from the second through hole 332 or the third through hole 333, and one half of the second through hole 332 or the third through hole 333 corresponds to the region between the first partition plate 31 and the second partition plate 32 while the other half of the second through hole 332 or the third through hole 333 crosses over to the first partition plate 31 and the second partition plate 32 and the other half of the second through hole 333 is different from that of the first through hole 332 or the third through hole 333 In the area on the side, when the gas and the hot air of the first partition plate 31 or the second partition plate 32 pass through the second through hole 332 and the third through hole 333, only half holes corresponding to the region between the first barrier 31 and the second barrier 32 can pass through the second through hole 332 and the third through hole 333, and while the gas and the hot air pass through the second through-hole 332 and the third through-hole 333, will cause a strong negative pressure to be generated in the small area near the second through hole 332 and the third through hole 333, and this negative pressure can suck the gas in the area on the side different from each other of the first partition plate 31 and the second partition plate 32 through the other half of the second through hole 332 and the third through hole 333, the two sides of the chamber can generate negative pressure in a semi-closed air mode, and the left and right chambers can suck outside air from the front side opening hole by the negative pressure to form a backflow state. The semi-closed gas type on both sides can suck external air through the fourth through hole 334 and the fifth through hole 335 for cooling, so that even if the burner is used at normal temperature (25 ℃) for a long time, the appearance temperature of the cavity of the fire-jet can be lower than 40 ℃ (the temperature difference is less than 15 ℃). Greatly reducing the danger of accidental touch and scald. Due to the above design, the area of the first partition plate 31 and the second partition plate 32 separated by the same air hole promotes more complete combustion due to more air mixing, and the flow direction can be uniformly and slightly brought outwards due to the speed difference, so that the flame can be uniformly distributed and diffused.
In view of the above, it can be concluded that the present invention has the following advantages:
1. the invention relates to a hot air gun for improving the flow guiding effect, which comprises a head part, wherein a flow guiding channel is arranged in the head part along the axial direction of a virtual axis, the flow guiding channel is provided with an inlet end and an outlet end different from the inlet end, an input part, an output part and a flow guiding part are arranged between the inlet end and the outlet end of the flow guiding channel, the output part is provided with two long sides and two short sides, the two long sides are not adjacent and opposite to each other, the two short sides are not adjacent and opposite to each other, the flow guiding part is arranged between the input part and the output part, the flow guiding channel is provided with two flow guiding flanges on the flow guiding part, the two flow guiding flanges are respectively adjacent to the two long sides, the two flow guiding flanges are opposite to each other, and the flow guiding channel of the hot air gun is combined with the design of three geometric characteristics, the pressure and the flow field in the gas mixing cavity are effectively controlled by means of the flow guide matching section change of the curved surface of the gas mixing cavity, the generation of backflow and turbulence can be greatly reduced, the combustion efficiency is promoted, the noise is effectively reduced, the pressure drop is reduced, the overall flow is promoted under the same condition of gas supply pressure, and the gas flow speed at the outlet is uniformly distributed, so that the combustion condition is easy to control, the pressure range adapting to gas supply is enlarged, and the ignition rate is not easily influenced even when the gas supply pressure is changed.
Claims (15)
1. The utility model provides a promote hot-blast rifle of water conservancy diversion effect which characterized in that, including:
a head, a flow guiding channel is arranged in the head along the axial direction of a virtual axis, the flow guiding channel is provided with an inlet end and an outlet end different from the inlet end, an input part, an output part and a flow guiding part are arranged between the inlet end and the outlet end of the flow guiding channel, the output part is provided with two long sides and two short sides, the two long sides are not adjacent and opposite to each other, the two short sides are not adjacent and opposite to each other, the flow guiding part is arranged between the input part and the output part, the flow guiding channel is provided with two flow guiding flanges in the flow guiding part, the two flow guiding flanges are respectively adjacent to the two long sides and opposite to each other, the flow guiding part is provided with a first flow area axially extending along a first virtual extension line, a second flow area axially extending along a second virtual extension line and a third flow area by taking the two flow guiding flanges as a boundary, the first flow area and the second flow area are respectively located on two different sides of the flow guide flange, the third flow area is located between the two flow guide flanges, one side of the third flow area is connected with the first flow area, the other different side of the third flow area is connected with the second flow area, the cross-sectional area of the first flow area along the radial direction of the first virtual extension line is gradually reduced from one end adjacent to the input part to one end adjacent to the output part, the cross-sectional area of the first flow area along the radial direction of the first virtual extension line from the input part to the midpoint of the output part is larger than 0.25 times and smaller than 0.4 times of the cross-sectional area of the input part along the radial direction of the virtual axis, the cross-sectional area of the second flow area along the radial direction of the second virtual extension line is gradually reduced from one end adjacent to the input part to one end adjacent to the output part, and the cross-sectional area of the second flow area along the radial direction of the second virtual extension line from the input part to the midpoint of the output part is larger than 0.25 times of the cross-sectional area of the input part along the And less than 0.4 times.
2. The heat gun of claim 1, wherein: the maximum sectional area of the first flow area along the radial direction of the first virtual extension line is one third of the sectional area of the input part along the radial direction of the virtual axis, and the maximum sectional area of the second flow area along the radial direction of the second virtual extension line is one third of the sectional area of the input part along the radial direction of the virtual axis.
3. The heat gun of claim 1, wherein: the minimum width of the first flow area along the radial direction of the first virtual extending line and the minimum width of the second flow area along the radial direction of the second virtual extending line are larger than the minimum width of the third flow area along the radial direction of the virtual axis.
4. The heat gun of claim 3, wherein: the first virtual extension line and the second virtual extension line pass through the virtual axis and are symmetrical by taking the virtual axis as a reference, and an included angle between the first virtual extension line and the second virtual extension line forms a diffusion angle which is larger than 60 degrees and smaller than 160 degrees.
5. The heat gun with improved diversion effect as claimed in claim 4, wherein: the hot air gun comprises a fan cover, the fan cover is arranged at the head and located at the outlet end of the flow guide channel, the fan cover comprises a first partition plate, a second partition plate and a cover body, the first partition plate and the second partition plate are arranged at the outlet end of the flow guide channel, the first partition plate and the second partition plate extend in the direction parallel to the axial direction of the virtual axis and the direction of the long edge, the cover body extends in the radial direction of the virtual axis and is arranged on one side, different from the output part, of the first partition plate and the second partition plate, a first through hole, a second through hole and a third through hole penetrate through the cover body, the first through hole is located between the first partition plate and the second partition plate, the second through hole corresponds to the first partition plate and is located on one side, different from the output part, of the first partition plate in the direction parallel to the axial direction of the virtual axis, and the third through hole corresponds to the second partition plate and is located on one side, different from the output part, different from the second partition plate in the direction parallel to the axial direction of the virtual axis.
6. The heat gun with improved air guiding effect as claimed in claim 5, wherein: the cover body is provided with a fourth through hole and a fifth through hole in a penetrating mode, the fourth through hole is located on one side, different from the second partition plate, of the first partition plate, and the fifth through hole is located on one side, different from the first partition plate, of the second partition plate.
7. The heat gun with improved air guiding effect as claimed in claim 5, wherein: the outer peripheries of the diversion flange adjacent to two different sides of the two short sides are close to each other from the output part to the input part and are tapered.
8. The heat gun for improving air flow guiding effect as claimed in claim 7, wherein: the outer peripheries of the diversion flanges adjacent to two different sides of the two short sides are provided with non-planar profiles.
9. The heat gun for improving air flow guiding effect as claimed in claim 7, wherein: the long edge is provided with a long edge length along the direction parallel to the radial direction of the virtual axis, the short edge is provided with a short edge width along the direction parallel to the radial direction of the virtual axis, the long edge length is greater than the maximum width of the inlet end of the flow guide channel, and the short edge width is less than the minimum width of the inlet end of the flow guide channel.
10. The heat gun for improving air flow guiding effect as claimed in claim 9, wherein: one side of each of the two diversion flanges adjacent to each other is provided with a top surface, and the distance between the two top surfaces is larger than or equal to the width of the short edge.
11. The heat gun of claim 10, wherein: the two top surfaces can be parallel to each other or form an included angle between the two top surfaces which is larger than 0 degree and smaller than 10 degrees, and the distance between the two top surfaces on the side adjacent to the input part is larger than the distance between the two top surfaces on the side adjacent to the output part.
12. The heat gun for improving air flow guiding effect as claimed in claim 9, wherein: the distance between the first clapboard and the second clapboard is larger than the width of the short edge.
13. The heat gun for improving air flow guiding effect as claimed in claim 9, wherein: the cross-sectional area of the output portion in the radial direction of the virtual axis is greater than 0.8 times and less than 1.2 times the cross-sectional area of the input portion in the radial direction of the virtual axis.
14. The heat gun for improving air flow guiding effect as claimed in claim 13, wherein: the cross-sectional area of the output portion in the radial direction of the virtual axis is equal to the cross-sectional area of the input portion in the radial direction of the virtual axis.
15. The heat gun of claim 14, wherein: the input portion is circular in cross section along the radial direction of the virtual axis, and the output portion is quadrilateral in cross section along the radial direction of the virtual axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611047030.3A CN108087873B (en) | 2016-11-21 | 2016-11-21 | Hot air gun capable of improving flow guide effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611047030.3A CN108087873B (en) | 2016-11-21 | 2016-11-21 | Hot air gun capable of improving flow guide effect |
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| Publication Number | Publication Date |
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| CN108087873A CN108087873A (en) | 2018-05-29 |
| CN108087873B true CN108087873B (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611047030.3A Active CN108087873B (en) | 2016-11-21 | 2016-11-21 | Hot air gun capable of improving flow guide effect |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115013968B (en) * | 2022-06-07 | 2023-07-25 | 常州市武进辰光电器制造有限公司 | Air outlet pipe with spiral accelerating structure for hot air gun and adjustable gun head |
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| FR2520090A1 (en) * | 1982-01-15 | 1983-07-22 | Guilbert & Fils Leon | Gas blow lamp for shrinkage of wrapping material - has needle valve to control fuel flow from injector |
| US5810579A (en) * | 1996-09-24 | 1998-09-22 | Lin; Arlo H. T. | Hot gas spray pistol |
| JP2001241618A (en) * | 2000-02-28 | 2001-09-07 | Noritz Corp | Combustion equipment |
| DE10053877B4 (en) * | 2000-10-31 | 2004-10-07 | Robert Bosch Gmbh | Burner plate for a gas burner |
| CN2727561Y (en) * | 2004-09-10 | 2005-09-21 | 林槐泰 | Improved gas hot blast gun |
| CN2828572Y (en) * | 2005-09-29 | 2006-10-18 | 严隆基 | Gas spray gun for heating-up furnace |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9182144B2 (en) * | 2012-03-02 | 2015-11-10 | Pro-Iroda Industries, Inc. | Hot air blower |
| TW201541025A (en) * | 2014-04-22 | 2015-11-01 | Pro Iroda Ind Inc | Gas hot air gun head |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2520090A1 (en) * | 1982-01-15 | 1983-07-22 | Guilbert & Fils Leon | Gas blow lamp for shrinkage of wrapping material - has needle valve to control fuel flow from injector |
| US5810579A (en) * | 1996-09-24 | 1998-09-22 | Lin; Arlo H. T. | Hot gas spray pistol |
| JP2001241618A (en) * | 2000-02-28 | 2001-09-07 | Noritz Corp | Combustion equipment |
| DE10053877B4 (en) * | 2000-10-31 | 2004-10-07 | Robert Bosch Gmbh | Burner plate for a gas burner |
| CN2727561Y (en) * | 2004-09-10 | 2005-09-21 | 林槐泰 | Improved gas hot blast gun |
| CN2828572Y (en) * | 2005-09-29 | 2006-10-18 | 严隆基 | Gas spray gun for heating-up furnace |
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| Publication number | Publication date |
|---|---|
| CN108087873A (en) | 2018-05-29 |
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