JP2009109176A - Hot air blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot air blower improving fuel economy, by enhancing a heat exchange ratio between a heat source and air passing through a casing. <P>SOLUTION: This hot air blower 1 icludes: a casing 14 having an intake port 10 and an exhaust port 12; a heat source 16 arranged in this casing 14; and an air blowing means 18 sucking the air in the casing 14 from the intake port 10 and exhausting the air in the casing 14 from the exhaust port 12. The blower 1 heats the air sucked in the casing 14 with the heat source 16, and exhausts it as hot air from the exhaust port 12. The heat source 16 includes a combustion chamber 20 radiating heat by heating the inside by a burner 24, and heat radiating fins 32 are arranged on an outer peripheral surface of a wall body 20a constituting this combustion chamber 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot air blower used to heat a facility horticultural house or factory.

  Conventionally, as a hot air blower used to heat a facility horticultural house or factory, as described in Patent Document 1, a casing having an intake port and an exhaust port, and a heat source provided in the casing There is known a hot air blower provided with air feeding means for sucking air into the casing from the air inlet and exhausting air within the casing from the air outlet.

In such a conventional hot air blower, the air sucked into the casing is heated by a heat source and exhausted as hot air from the exhaust port.
JP-A-5-133610

  However, in the above-described conventional hot air blower, the heat exchange rate between the air passing through the casing and the heat source is low, and the fuel consumption is deteriorated. That is, since the air sucked into the casing passes near the heat source at a predetermined flow rate, it is difficult to ensure a sufficient contact time with the heat source until it is exhausted from the exhaust port. There was a problem that the rate decreased and the fuel consumption was unnecessarily increased.

  Then, an object of this invention is to provide the hot air blower which can raise the heat exchange rate between the air which passes the inside of a casing, and a heat source, and can improve a fuel consumption.

  In order to achieve the above object, the invention according to claim 1 is a casing having an intake port and an exhaust port, a heat source provided in the casing, and suctioning air from the intake port into the casing. An air supply means for exhausting air in the casing from the exhaust port, wherein the air sucked into the casing is heated by the heat source and exhausted as hot air from the exhaust port. The heat source includes a combustion chamber that dissipates heat by heating the inside with a burner, and a plurality of heat dissipating fins are provided on the outer peripheral surface of the wall constituting the combustion chamber.

  The invention according to claim 2 is characterized in that the heat dissipating fins are joined to a substrate that can be detachably mounted on the outer peripheral surface of the wall body.

  The invention described in claim 3 is characterized in that the heat dissipating fin is formed of a flat plate having a substantially square cross section by being bent at a central portion in the left-right direction.

  According to a fourth aspect of the present invention, the radiating fin is formed by cutting and bending a band-shaped metal plate having a predetermined width dimension for each first predetermined length, and the substrate has a second predetermined It is characterized in that strips formed by cutting the metal plate for each length are arranged in the width direction and joined.

  The invention according to claim 5 is characterized in that the radiating fins are joined to the substrate at a joining portion for joining the strips.

  The invention described in claim 6 is characterized in that the radiating fins are arranged in a staggered manner in the length direction of the strip.

  According to the first aspect of the present invention, the casing having the air inlet and the air outlet, the heat source provided in the casing, and the air from the air inlet to the casing are sucked from the air outlet to the inside of the casing. An air supply means for exhausting air, and in a hot air blower that heats the air sucked into the casing with a heat source and exhausts it as warm air from an exhaust port, the heat source dissipates heat by heating the interior with a burner Since a plurality of radiating fins are provided on the outer peripheral surface of the wall body constituting the combustion chamber, including the combustion chamber, in addition to the outer peripheral surface of the wall body constituting the combustion chamber, the contact area with the air is increased by the surface integral of the radiating fin. In addition to increasing the heat exchange rate between the air in the casing and the heat source by ensuring sufficient contact time with the outer peripheral surface of the wall constituting the combustion chamber by applying the air in the casing to the radiating fins High , It is possible to improve the fuel economy.

  According to the second aspect of the present invention, since the heat dissipating fins are joined to the substrate that can be detachably mounted on the outer peripheral surface of the wall body, the existing combustion chamber can be used easily and simply. The contact area with the air corresponding to the surface area of the radiating fin can be increased.

  According to the third aspect of the present invention, since the radiating fin is formed of a flat plate having a substantially transverse cross section by being bent at the center in the left-right direction, the air in the casing is applied to the radiating fin. By promoting the retention of air in the vicinity of the outer peripheral surface of the wall body constituting the combustion chamber, and ensuring a longer contact time between the air and the outer peripheral surface of the wall body constituting the combustion chamber, The heat exchange rate between the air and the heat source can be increased, and fuel consumption can be improved.

  According to the fourth aspect of the present invention, the radiating fin is formed by cutting and bending a band-shaped metal plate having a predetermined width dimension for each first predetermined length, and the substrate has a second predetermined Since the strips formed by cutting the metal plate for each length are aligned and joined in the width direction, if one strip-shaped metal plate with a predetermined width is prepared, the heat radiation fin and the substrate Both can be formed, and the number of parts and the manufacturing cost can be reduced.

  According to the fifth aspect of the present invention, since the radiating fins are bonded to the substrates at the bonding portion where the strips are bonded to each other, the substrates are bonded to each other and the radiating fins are bonded to the substrate individually. There is no need to improve workability.

  According to the invention described in claim 6, since the radiating fins are arranged in a staggered manner in the length direction of the strip, the air flow is appropriately disturbed when the air in the casing is applied to the radiating fins. As a result, by promoting the retention of air in the vicinity of the outer peripheral surface of the wall body constituting the combustion chamber, and ensuring more contact time between the air and the outer peripheral surface of the wall body constituting the combustion chamber, The heat exchange rate between the air in the casing and the heat source can be increased, and fuel consumption can be improved.

  Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side sectional view of a hot air blower according to an embodiment of the present invention, and FIG. 2 is an AA sectional view of the hot air blower shown in FIG. Note that the hot air blower according to the present embodiment can be installed in any place where heating is necessary, such as a facility horticulture house or a factory.

  As shown in FIGS. 1 and 2, the hot air blower 1 according to the present embodiment includes a casing 14 having an intake port 10 and an exhaust port 12, a heat source 16 provided in the casing 14, and an intake port 10. While the air is sucked into the casing 14, a blower fan 18, which is an air supply means for exhausting the air in the casing 14 from the exhaust port 12, is provided. The heat source 16 includes a combustion chamber 20 and a smoke pipe 22.

  The casing 14 is formed in a substantially rectangular box shape. The substantially cylindrical combustion chamber 20 constituting the heat source 16 is housed and disposed on the front side in the casing 14, while the rear side in the casing 14 is also the same. A smoke pipe 22 constituting the heat source 16 is accommodated. An intake port 10 is provided on the upper surface of the casing 14 and above each of the combustion chamber 20 and the smoke pipe 22, and blower fans 18, 18 are provided in the intake port 10 along the longitudinal direction of the casing 14. Is provided. On the other hand, an exhaust port 12 is provided on the lower surface of the casing 14 and below the smoke pipe 22. In the figure, reference numeral 15 denotes a frame-like frame that supports the casing 14.

  A burner 24 is provided on the front side of the combustion chamber 20, that is, on the opposite side of the combustion chamber 20 from the smoke tube 22, with the burner 24 projecting to the outside of the front wall of the casing 14. Heat is dissipated by heating. A plurality of concentric circles having the same center as that of the combustion chamber 20 are arranged in parallel with each other at a predetermined interval, and one end of the smoke tube 22 communicates with the combustion chamber 20, and the other end is a casing. 14 communicates with a chimney 28 via a smoke chamber 26 provided at the rear end of the interior 14. The chimney 28 is attached to the rear end portion of the smoke chamber 26 and projects rearward through the rear surface of the casing 14. The high-temperature combustion gas generated by the combustion of the burner 24 inside the combustion chamber 20 passes through each smoke pipe 22 and the smoke chamber 26 and is finally exhausted from the chimney 28 to the outside.

  Between the combustion chamber 20 and the smoke pipe 22 and the inner peripheral surface 14a of the casing 14, a ventilation space 30 through which air sucked into the casing 14 from the intake port 10 passes is provided. While passing through the ventilation space 30, the air sucked into the casing 14 from the air inlet 10 is heated in contact with the heat source 16, that is, the combustion chamber 20 and the smoke pipe 22, and is exhausted as hot air from the air outlet 12. The

  And especially in this embodiment, the radiation fin 32 is provided with two or more by the outer peripheral surface of the wall 20a which comprises the combustion chamber 20. As shown in FIG. The radiating fin 32 is erected toward the ventilation space 30, and the heat of the combustion chamber 20 heated by the burner 24 is transmitted to the radiating fin 32. The air passing through the ventilation space 30 collides with the radiating fins 32 in the vicinity of the outer peripheral surface of the wall body 20 a constituting the combustion chamber 20, and heat is exchanged between the outer peripheral surface of the wall body 20 a and the radiating fins 32. Is heated and becomes warm air.

  As described above, since the plurality of radiating fins 32 are provided on the wall body 20a constituting the combustion chamber 20, the surface area of the radiating fin 32 in addition to the outer peripheral surface of the wall body 20a constituting the combustion chamber 20 is in contact with the air. Can be increased. Further, when air hits the heat radiating fins 32 in the ventilation space 30 in the casing 14, the air stays in the vicinity of the outer peripheral surface of the wall body 20a, and a sufficient contact time with the outer peripheral surface of the wall body 20a is secured. Therefore, the heat exchange rate between the air in the casing 14 and the heat source 16, in particular, the combustion chamber 20, can be increased, and fuel consumption can be improved.

  Here, a specific configuration of the radiation fin 32 will be described with reference to FIGS. 1 and 3. FIG. 3 is an enlarged perspective view of the radiating fin 32.

  As shown in FIGS. 1 and 3, the heat radiating fins 32 are joined to a substrate 34 that can be detachably attached to the outer peripheral surface of the wall 20 a constituting the combustion chamber 20.

  Specifically, the substrate 34 has a bent shape corresponding to the curvature of the outer peripheral surface of the wall body 20a constituting the substantially cylindrical combustion chamber 20, and is superimposed on the outer peripheral surface of the wall body 20a. Thus, the periphery of the wall 20a is fixed in a substantially intimate contact state by binding the periphery thereof with a separately provided heat-resistant band (not shown). A plurality of heat radiation fins 32 are joined to the substrate 34 in close contact by welding (see FIG. 4).

  The range in which the substrate 34 is superposed on the outer peripheral surface of the wall body 20a (hereinafter referred to as the overlapping range of the substrate 34) may be the entire range of the outer peripheral surface of the wall body 20a, but a part of the outer peripheral surface of the wall body 20a. It is good as a range. When the polymerization range of the substrate 34 is a partial range of the outer peripheral surface of the wall body 20a, for example, when the combustion chamber 20 is viewed from the side, at least the front side and the back side of the outer peripheral surface of the wall body 20a are included. It is preferable to be in the range. By setting this range as the polymerization range of the substrate 34, the heat radiation fins 32 can be prepared and easily attached to the combustion chamber 20 by sandwiching the combustion chamber 20 from the front side and the back side with the substrate 34.

  Thus, since the radiation fins 32 are joined to the substrate 34 that can be detachably attached to the outer peripheral surface of the wall body 20a, heat radiation can be easily and simply performed using the existing combustion chamber 20. The contact area with the air can be increased by the surface integral of the fin 32.

  Moreover, the radiation fin 32 is comprised with the flat plate body which made the cross section substantially letter-shaped by bending at the center part of the left-right direction. More specifically, the heat radiating fins 32 are bent in a substantially square cross section that opens toward the front side of the casing 14, that is, in a direction from the smoke pipe 22 toward the combustion chamber 20. As a result, the air that has flowed into the spaces between the heat radiating fins 32 is guided into the bent portions of the heat radiating fins 32 to be dammed, and the combustion chamber 20 when the air in the casing 14 is applied to the heat radiating fins 32. The stagnation of air in the vicinity of the outer peripheral surface of the wall body 20a constituting the wall is promoted. Therefore, more contact time between the air and the outer peripheral surface of the wall body 20a constituting the combustion chamber 20 can be secured, and as a result, the air between the casing 14 and the heat source 16, in particular, between the combustion chamber 20 is secured. The heat exchange rate can be increased and the fuel consumption can be further improved.

  The height of the radiation fin 32 is preferably about 35 mm. If the height of the radiating fins 32 is about 35 mm, the air that has flowed into the spaces between the radiating fins 32 is easily guided into the bent portions of the radiating fins 32, and the air in the casing 14 is transferred to the radiating fins 32. It is possible to further promote the stagnation of air in the vicinity of the outer peripheral surface of the wall body 20a constituting the combustion chamber 20 when it is applied to, and to further improve the heat exchange rate. If the height of the radiating fin 32 is lower than about 35 mm, the contact area with the air in the vicinity of the outer peripheral surface of the wall 20a is reduced. Conversely, if the height of the radiating fin 32 is higher than about 35 mm, Due to the collision with air, the radiating fins 32 are easily bent. For this reason, the air in the vicinity of the outer peripheral surface of the wall body 20a cannot be sufficiently dammed, which is unsuitable for improving the heat exchange rate.

  Here, the radiating fin 32 is formed by cutting and bending a band-shaped metal plate having a predetermined width dimension for each first predetermined length, and the substrate 34 is formed of the above metal for each second predetermined length. Three strips 36 formed by cutting a plate are aligned and joined in the width direction. Accordingly, if one strip-shaped metal plate having a predetermined width is prepared, both the radiation fins 32 and the substrate 34 can be formed from the strip-shaped metal plate, and different metal materials are used for the radiation fins 32 and the substrate 34. There is no need to prepare. Therefore, it is possible to reduce the number of parts and the manufacturing cost. The number of the strip-shaped strips 36 is not limited to three, but may be two or four or more.

  In addition, it is preferable that the width dimension of a strip | belt-shaped metal plate is about 35 mm which is the height dimension of the radiation fin 32. FIG. In addition, as the first predetermined length, a length capable of guiding air in the vicinity of the outer peripheral surface of the wall body 20a constituting the combustion chamber 20 can be appropriately employed. Further, as the second predetermined length, a length that can be bent according to the curvature of the outer peripheral surface of the wall body 20a constituting the substantially cylindrical combustion chamber 20 can be appropriately employed. This is to improve the assemblability and workability of the radiation fins 32 and the substrate 34.

  Next, the bonding state of the radiation fins 32 to the substrate 34 and the bonding state of the strips 36 of the substrate 34 will be specifically described with reference to FIG. FIG. 4 is a schematic explanatory view for explaining the joining state of the radiation fins 32 to the substrate 34 and the joining state of the strips 36 of the substrate 34.

  As shown in FIG. 4, the substrate 34 is formed by joining the strips 36 by spot welding with the three strips 36 arranged in the width direction. That is, each strip 36 is joined with spot welding welds 38 formed at predetermined intervals in the length direction of the strip 36 in a state where the side surfaces are in contact with each other.

  And the radiation fin 32 is welded with respect to the board | substrate 34 in the state straddling each strip 36 joined via the welding part 38. As shown in FIG. That is, both end portions of the radiating fin 32 bent in a substantially square shape are welded to any one of the strips constituting the substrate 34 via the welded portions 40 and 42, while the bent portion of the radiating fin 32 is provided. Are welded to the strip 36 adjacent to the strip 36 where the welds 40 and 42 are formed via the weld 44. Thus, since the radiation fins 32 are welded to the substrate 34 in a state of straddling the strips 36 joined via the welds 38, the joining of the strips 36 can be further strengthened. Even if the welded portion 38 deteriorates due to heating by the combustion chamber 20, the strips 36 are joined by the welded portions 40, 42, 44, thereby preventing the strips 36 from separating. be able to.

  The hot air blower 1 which concerns on this embodiment is comprised as mentioned above, and demonstrates the effect | action when this hot air blower 1 is actually used.

  First, when a power switch (not shown) is turned ON, the two blower fans 18 and 18 are rotated. By rotating the blower fans 18, 18, external air is sucked into the casing 14 from the air inlet 10, passes through the ventilation space 30, and is heated by being in contact with the combustion chamber 20 and the smoke pipe 22 during this time. The air is exhausted from the exhaust port 12.

  At this time, since a plurality of radiating fins 32 are provided on the outer peripheral surface of the wall body 20a constituting the combustion chamber 20, the air passing through the ventilation space 30 hits the radiating fins 32, whereby the outer peripheral surface of the wall body 20a. Stays in the vicinity. The heat of the combustion gas generated in the combustion chamber 20 by the combustion of the burner 24 is effectively transmitted to the radiating fins 32, and this heat is exchanged with the air staying in the vicinity of the outer peripheral surface of the wall body 20a via the radiating fins 32. Exchanged between them to raise the temperature of the air.

  Thus, in this embodiment, since the plurality of heat radiation fins 32 are provided on the outer peripheral surface of the wall body 20a constituting the combustion chamber 20, in addition to the outer peripheral surface of the wall body 20a constituting the combustion chamber 20, The contact area with air can be increased by the surface integration. Further, when air hits the heat radiating fins 32 in the ventilation space 30 in the casing 14, the air stays in the vicinity of the outer peripheral surface of the wall body 20a, and a sufficient contact time with the outer peripheral surface of the wall body 20a is secured. Therefore, the heat exchange rate between the air in the casing 14 and the heat source 16, in particular, the combustion chamber 20, can be increased, and fuel consumption can be improved.

  Next, other embodiment of the radiation fin 32 with which the hot air blower 1 of this invention was provided is described with reference to FIG. A portion different from the radiating fin 32 shown in FIG. 4 is a bonding state of the radiating fin 32 to the substrate 34. Other configurations are the same as those of the radiation fin 32 shown in FIG.

  FIG. 5 is a schematic explanatory diagram for explaining a bonding state of the radiation fins 32 to the substrate 34 according to the present embodiment. In addition, the same code | symbol is attached | subjected to the part which has the same part or the same function.

  In the hot air blower according to the present embodiment, as shown in FIG. 5, the radiation fins 32 are joined to the substrate 34 at the joint where the strips 36 are joined together.

  In other words, in a state where the three strips 36 are arranged in the width direction and the side surfaces thereof are in contact with each other, the both end portions of the radiating fins 32 bent in a substantially square shape are formed along the contact surfaces of the strips 36. The welds 50 and 52 are formed by spot welding. The strips 36 are joined to each other through the welded portions 50 and 52, and the radiation fins 32 are joined to the substrate 34 through the welded portions 50 and 52.

  Thereby, it is not necessary to individually bond the substrates 34 to each other and to bond the radiating fins 32 to the substrate 34, so that the workability can be improved. Instead of the both end portions of the radiating fins 32, the bent portions of the radiating fins 32 may be welded via the welded portions 54 by spot welding.

  Next, other embodiment of the radiation fin 32 with which the hot air blower 1 of this invention was provided is described with reference to FIG. A portion different from the radiation fins 32 shown in FIG. 5 is a bonding state of the radiation fins 32 to the substrate 34. Other configurations are the same as those of the radiation fin 32 shown in FIG.

  In the hot air blower according to the present embodiment, as shown in FIG. 6, the radiating fins 32 are arranged in a staggered manner in the length direction of the strip 36.

  That is, both ends of one radiating fin 32 bent in a substantially square shape along the contact surfaces of the strips 36 in a state where the three strips 36 are arranged in the width direction and the side surfaces thereof are in contact with each other. The welded portions 60 and 62 are formed by spot welding the portions, and then the welded portion 64 is formed by spot-welding the bent portions of other adjacent radiating fins 32, and the welded portions 60 and 62 are in this order. And the welding part 64 is formed repeatedly. The strips 36 are joined to each other through the welded portions 60, 62, and 64, and the heat radiation fins 32 are joined to the substrate 34 through the welded portions 60, 62, and 64.

  Thereby, it is not necessary to individually bond the substrates 34 to each other and to bond the radiating fins 32 to the substrate 34, so that the workability can be improved. Moreover, when the air in the casing 14 is applied to the radiating fins 32, the air flow can be appropriately disturbed, and as a result, the retention of air near the outer peripheral surface of the wall body 20a constituting the combustion chamber 20 is promoted. The heat exchange rate between the air in the casing 14 and the heat source 16, in particular, the combustion chamber 20, is ensured by ensuring a longer contact time between the air and the outer peripheral surface of the wall body 20 a constituting the combustion chamber 20. Can be improved and fuel consumption can be improved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

  For example, in the present embodiment, the substrate 34 is formed by arranging the strips 36 side by side in the width direction, but is not limited thereto, and may be formed by a single metal plate.

It is a sectional side view of the warm air blower concerning the embodiment of the present invention. It is a sectional side view of the warm air blower concerning the embodiment of the present invention. It is an expansion perspective view of a radiation fin. It is typical explanatory drawing for demonstrating the joining state to the board | substrate of a radiation fin, and the joining state of the strips of a board | substrate. It is typical explanatory drawing for demonstrating the joining state to the board | substrate of the radiation fin which concerns on other embodiment. It is typical explanatory drawing for demonstrating the joining state to the board | substrate of the radiation fin which concerns on other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot air blower 10 Intake port 12 Exhaust port 14 Casing 16 Heat source 18 Air supply means (blower fan)
20 Heat source (combustion chamber)
20a Wall body 22 Heat source (smoke pipe)
24 Burner 32 Radiating fin 34 Substrate 36 Strip

Claims (6)

A casing having an intake port and an exhaust port;
A heat source provided in the casing;
Air suction means for sucking air into the casing from the intake port, and exhausting air in the casing from the exhaust port, and heating the air sucked into the casing with the heat source In the hot air blower that exhausts as hot air from the exhaust port,
The heat source includes a combustion chamber that dissipates heat by heating the inside with a burner, and a plurality of heat dissipating fins are provided on an outer peripheral surface of a wall constituting the combustion chamber.   The hot air blower according to claim 1, wherein the heat radiating fin is joined to a substrate that is detachably attached to the outer peripheral surface of the wall body.   3. The hot air blower according to claim 2, wherein the heat dissipating fin is formed of a flat plate having a substantially square cross section by being bent at a central portion in a left-right direction. The radiating fin is formed by cutting and bending a band-shaped metal plate having a predetermined width dimension for each first predetermined length,
The hot air blower according to claim 3, wherein the substrate is formed by joining strips formed by cutting the metal plate for each second predetermined length in parallel in the width direction.   The hot air blower according to claim 4, wherein the heat radiating fins are bonded to the substrate at a bonding portion where the strips are bonded to each other.   The hot air blower according to claim 5, wherein the heat dissipating fins are arranged in a staggered manner in a length direction of the strip.

Images