JP6640064B2 - Hot air heater - Google Patents

Description

  The present invention relates to a hot air heater that mixes combustion exhaust gas generated by fuel combustion with room air and uses it for heating.

  2. Description of the Related Art Conventionally, a warm air heater generally includes a blower box that connects a warm air inlet and a warm air outlet in a main body of the warm air heater as disclosed in Patent Literature 1, and combustion exhaust gas discharged from a combustion cylinder. And a blast air from a convection fan to form a hot air passage for guiding the hot air to a hot air outlet.

JP 2006-84124 A

  In such a hot air heater, as the operation time elapses, an outer body that forms the main body of the hot air heater by radiant heat from a flame burning inside the combustion tube or heat transfer from the hot air passing through the blowing box. The temperature of the air stagnating inside increases. However, since the inside of this exterior body is partitioned into a hot air passage and other spaces by a blower box, air sent from the convection fan hardly flows into the space other than the hot air passage, and Because the structure has few places that can escape from the space to the outside, it was easy for hot air to accumulate in this space.

  If the space other than the hot air passage becomes high in temperature, electronic components and resin components disposed inside the hot air heater may be damaged by heat, which may impair the safety of the product. As a means for suppressing such thermal damage, it is conceivable to employ a component having a high heat-resistant temperature, but the component cost increases.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a hot-air heater having excellent safety by suppressing a rise in temperature inside a main body case.

The present invention provides a main body case, an air outlet provided on a front surface of the main body case, a blower for taking in outside air into the main body case, a burner for generating combustion exhaust gas by combustion, and a flame covering the burner flame. A combustion chamber provided to form a combustion chamber main body that discharges exhaust gas upward, and a hot air passage that mixes the combustion exhaust gas and air from the blower and guides the mixture to the outlet from the combustion chamber main body. In a warm air heater provided with a heat shield plate, an exhaust hole for discharging air between the main body case and the combustion chamber heat shield plate is provided on the front side of the main body case, and provided on the front side of the main body case. Has a blow-out opening to which the blow-out opening is attached, and the exhaust hole is provided on a contact surface between the blow-out opening and the blow-out opening. .

Further, the outlet and the outlet are substantially rectangular, and the outlet and the outlet are in contact with four sides, and the exhaust hole is provided only on the contact surface of the upper side. The hot air heater according to claim 1, characterized in that:

Further, the blower is attached to an intake opening provided on a back surface of the main body case, and the combustion chamber heat shield plate is arranged so as to cover the intake opening, and a side surface from the blower is provided. An outlet is provided to allow a part of the air to flow out of the combustion chamber heat shield, and the air flowing out of the outlet flows to the exhaust hole along the outside of the combustion chamber heat shield. The warm air heater according to claim 1 or 2.

Further, inside the main body case, a fuel container housing portion for housing a container for storing fuel is provided, and between the front surface of the main body case and the fuel container housing portion, operation of the hot air heater is performed. The hot air heater according to claim 3 , wherein a control unit for controlling is arranged, and a part of the air flowing out of the outlet flows around the control unit .

  With the above configuration, it is possible to suppress a rise in the temperature inside the main body case, and to provide a hot air heater with excellent safety.

It is a longitudinal section composition figure of a warm air heater of the present invention. It is a front view in the state where the main body case front of the warm air heater of the present invention was removed. It is an external appearance perspective view of the outlet of the present invention. It is an external appearance perspective view of the combustion chamber heat shield of the present invention.

  The best mode of the present invention which is considered to be preferable will be briefly described by showing the operation and effect of the present invention.

  In the hot air heater of the present invention, an exhaust hole for discharging air between the main body case and the combustion chamber heat shield plate is provided on the front side of the main body case. In other words, the air inside the main body case, which has been heated by the heat from the flame, is released from the front side of the main body case to the outside, so that the high-temperature air can be prevented from collecting inside the main body case. In addition, by providing the exhaust hole, the space other than the hot air passage communicates with the outside of the main body case to reduce the internal pressure, and it becomes easy for low-temperature outside air to flow. Thereby, it is possible to avoid thermal damage to electronic components and resin components arranged inside the main body case. In addition, since the exhaust hole is provided on the front side of the main body case, it is difficult for the liquid such as water to enter the exhaust hole even if the liquid falls over the main body case, and it is possible to prevent the liquid from flowing into the inside of the main body case.

  In addition, an outlet is provided on the side surface of the heat shield plate of the combustion chamber, and a part of the air taken in from the blower is caused to flow outward from the outlet, and to flow around the outside of the heat shield plate of the combustion chamber to the exhaust hole. Therefore, the high-temperature air staying between the main body case and the combustion chamber heat shield plate is pushed out, and is discharged from the exhaust hole to the outside of the main body case. Thereby, the temperature inside the main body case can be kept low.

  In addition, since a part of the air flowing from the outlet is also made to flow around the control unit, it is possible to prevent high-temperature air from collecting around the control unit, which dislikes being placed in a high-temperature atmosphere. Thereby, thermal damage to the control unit can be avoided.

  In addition, since the exhaust holes are provided on the contact surface between the air outlet and the blow-out opening located near the heat shield of the combustion chamber, the hot air around the heat shield of the combustion chamber is efficiently discharged. Therefore, a rise in temperature can be further suppressed.

  In addition, by providing an exhaust hole only on the upper side of the four sides where the outlet and the outlet abut, the air above the heat shield plate of the combustion chamber, which is likely to be the hottest, is efficiently exhausted at the shortest distance. be able to. Further, since the exhaust hole is opened upward, it is possible to prevent dust and the like from entering the main body case. Furthermore, since the exhaust hole is provided at a position where it is difficult for the user to visually recognize, foreign matter can be prevented from being inserted into the exhaust hole.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 and 2 are views showing the internal configuration of the hot air heater. Reference numeral 1 denotes a main body case, which is composed of main body case front surface 1a, main body case side surface 1b including left and right side surfaces and back surface, top surface 1c, and bottom surface 1d. Reference numeral 2 denotes a blower which is attached to an intake opening 3 provided on the back surface of the side surface 1b of the main body case and takes air into the main body case 1. A filter 4 for collecting dust and the like is detachably provided in the intake opening 3. Reference numeral 5 denotes an outlet which is attached to a blow-out opening 6 provided on the front surface 1a of the main body case 1 and blows warm air out of the main body case 1. In addition, what includes the front surface 1a of the main body case and the blowout opening 6 and the air outlet 5 provided in the front surface 1a of the main body case is referred to as the front side of the main body case.

  Reference numeral 7 denotes a vaporizer for heating and vaporizing the liquid fuel, 8 denotes a burner including a mixing pipe 9 and a flame hole 10, and 11 denotes a burner box containing the burner 8. Reference numeral 12 denotes a combustion chamber main body that covers the flame of the burner 8 and discharges combustion exhaust gas upward, 13 denotes a combustion chamber heat shield plate disposed so as to cover the combustion chamber main body 12 and the intake opening 3, and 14 denotes a combustion chamber main body. A hot air passage formed between the combustion chamber heat shield plate 12 and the combustion chamber heat shield plate 13 to mix the combustion exhaust gas with the air from the blower 2 and guide the mixture to the outlet 5 as hot air. An exhaust hole 15 is provided in the vicinity of the outlet of the hot air passage 14 for communicating the space between the main body case 1 and the heat shield plate 13 with the hot air passage 14.

  An operation unit 16 having a plurality of switches for performing operations such as operation / stop of the hot air heater and temperature setting is provided at a position above the front surface 1a of the main body case, and an operation board (not shown) is provided inside. I have.

  A temperature sensor 17 for detecting the temperature inside the main body case 1 is mounted on the upper surface of the combustion chamber heat shield plate 13. When the temperature sensor 17 detects that the temperature is equal to or higher than a predetermined temperature, it determines that the inside of the main body case 1 is in an abnormal state of overheating and stops the operation. Here, the predetermined temperature is a temperature that would not be reached if the filter 4 was not clogged and the blower 2 was operating normally (a temperature at which the temperature in the main body case 1 is determined to be abnormal).

  Further, on the side of the combustion chamber heat shield plate 13, there is provided a fuel container housing section 18 for partitioning the inside of the main body case 1 to house a cartridge tank (not shown) for storing kerosene. Since the space in which the fuel container housing portion 18 is arranged has a relatively low temperature even inside the main body case 1, it is suitable for arranging electronic components which are not desired to be placed at a high temperature. For this reason, a control board 19 as a control unit for controlling the operation of the warm air heater is mounted on the surface of the fuel container housing 18 facing the front surface 1a of the main body case.

  Next, a specific configuration of the exhaust hole 15 and its surroundings will be described with reference to FIGS. FIG. 3 is a view for explaining the outlet 5. The outlet 5 is a substantially square-shaped component, and includes a plurality of blades 20 that guide the direction of blowing hot air. Further, it has an outer peripheral surface 21 formed by bending four sides of the outer periphery of the outlet 5 in the direction of blowing hot air.

  On the other hand, the blow-out opening 6 to which the blow-out opening 5 is attached is opened in the front face 1a of the main body case 1a in a substantially square shape like the blow-out opening 5, and four sides of this opening are formed by bending four sides of the main body case 1 inward. The inner peripheral surface 22 is provided. Then, the outer peripheral surface 21 of the outlet 5 and the inner peripheral surface 22 of the outlet opening 6 are in contact with each other.

  The exhaust holes 15 are respectively provided on the outer peripheral surface 21 of the outlet 5 and the inner peripheral surface 22 of the outlet opening 6 which comes into contact therewith. 13 communicates with the outside of the main body case 1.

  The exhaust hole 15 is formed on the outer peripheral surface 21 so as to connect a plurality of long holes in the longitudinal direction. Although not shown, a plurality of long holes corresponding to the exhaust holes 15 provided on the outer peripheral surface 21 are also formed on the inner peripheral surface 22 of the blow-out opening 6 that contacts the outer peripheral surface 21. In the present embodiment, a plurality of long holes are provided as the exhaust holes 15. However, the present invention is not limited to this. For example, a single large long hole may be used. The blowout opening 6 may be provided with one large slot or notch which is opened to cover all of the plurality of slots.

  FIG. 4 is an external perspective view of the combustion chamber heat shield plate 13. A front wall 13a of a heat shield plate that is inclined from the upper surface of the heat shield plate 13 toward the outlet 5 is provided in the direction of the front surface 1a of the main body case of the heat shield plate 13 of the combustion chamber. An outlet 23 through which a part of the air taken in from the blower 2 flows out of the combustion chamber heat shield 13 is provided on a heat shield side 13 b of the combustion chamber heat shield 13 facing the fuel container housing 18. Is provided. The outlet 23 is formed by cutting and raising a part of the heat shield plate side surface 13b of the combustion chamber heat shield 13 inward. The air sent from the blower 2 is deflected by the cut and raised surface, flows into the outlet 23, and flows out of the combustion chamber heat shield plate 13. In the present embodiment, the cutout surface is provided at the outlet 23. However, the present invention is not limited to this. For example, a part that does not provide the cutout surface at the outlet 23 and turns the air flow to another place. May be provided so as to flow into the outlet 23, or a component for changing the direction may not be provided.

  Next, the operation of the hot air heater in the above configuration and the flow of air inside the main body case 1 will be described with reference to FIGS. The black arrows shown in the figure indicate the flow of warm air containing combustion exhaust gas or the flow of air heated to a high temperature due to radiation and heat transfer from the combustion chamber main body 12, and the white arrows indicate the low temperature taken from the blower 2. The flow of air.

  First, when the operation is started, the liquid fuel is heated and vaporized by the vaporizer 7 to become a vaporized gas, and is ejected from the nozzle into the mixing pipe 9. When the vaporized gas is ejected, the surrounding air is drawn into the mixing pipe 9 as primary air by the ejection power. Further, air introduced into the main body case 1 by driving the blower 2 is also pushed as primary air into the mixing pipe 9 from below the burner box 11 and mixed with the above-mentioned vaporized gas to form a mixed gas. Then, combustion is started in the flame hole 10. Further, the air from the blower 2 flows into the combustion chamber main body 12, and is supplied to the flame as secondary air for combustion.

  The combustion exhaust gas generated by the combustion is guided upward from an opening provided in the upper portion of the combustion chamber main body 12 as shown by a black arrow in FIG. The air is mixed with air from the blower 2 while passing through a hot air passage 14 formed between the air outlet and the hot air, and is discharged into the room through the outlet 5.

  As the operation time of the hot air heater elapses, air stagnating between the main body case 1 and the combustion chamber heat shield 13, particularly, air stagnating above the heat shield front wall 13 a, is generated by the combustion chamber main body 12. The temperature rises to a high temperature due to radiant heat of the burning flame and heat transfer from the hot air passing through the hot air passage 14. The high-temperature air passes through the outlet 5 so as to be pulled by the warm air flowing through the warm air passage 14 through the exhaust hole 15 and is discharged to the outside of the main body case 1.

  As described above, the high-temperature air staying between the main body case 1 and the combustion chamber heat shield plate 13 is discharged to the outside of the main body case 1 through the exhaust hole 15, so that the high-temperature air may be accumulated inside the main body case 1. Absent. In addition, since the inside and outside of the main body case 1 communicate with each other, the internal pressure of the main body case 1 decreases, and low-temperature outside air easily flows through gaps between components of the main body case 1, thereby suppressing an increase in temperature inside the main body case 1. be able to. Thereby, it is possible to avoid a risk that the electronic parts and the resin parts constituting the operation unit 16, the temperature sensor 17, the control board 19 and the like arranged inside the main body case 1 are damaged by heat. In addition, since the exhaust hole 15 is provided in the outlet 5 and the outlet 6 on the front side of the main body case, even if a liquid such as water spills and falls on the top surface 1c of the main body case 1, The liquid does not easily enter from the exhaust hole 15 and can be prevented from flowing into the main body case 1.

  Further, the air staying between the main body case 1 and the combustion chamber heat shield plate 13 tends to become high temperature due to the radiant heat of the flame burning in the combustion chamber main body 12 and the heat transfer from the hot air passing through the hot air passage 14. However, since the exhaust hole 15 is provided on the contact surface between the blowout opening 5 and the blowout opening 6 which are arranged continuously from the combustion chamber heat shield plate 13, air having a high temperature around the combustion chamber heat shield plate 13 is removed. Efficient discharge can be achieved, and temperature rise can be effectively suppressed.

  Further, it is more preferable that the exhaust hole 15 is provided only on the upper surface among the four sides of the outer peripheral surface 21 of the outlet 5 and the inner peripheral surface 22 of the outlet 6. With this structure, the air above the heat shield plate front wall 13a, which tends to be the hottest, can be discharged to the outside of the main body case 1 over the shortest distance. In addition, since the exhaust hole 15 is opened upward, dust and the like can be prevented from entering the main body case 1. In addition, since the position where the exhaust hole 15 is provided is hidden from the eyes of the user and is difficult to visually recognize, it is possible to prevent foreign matter from being inserted into the exhaust hole 15.

  As in the flow of the air 1 indicated by the white arrow in FIG. 2, part of the air from the blower 2 flows out of the combustion chamber heat shield 13 from the outlet 23 provided on the heat shield side 13 b. The outflowing air flows between the heat shield plate side surface 13b and the fuel container housing portion 18 and flows upward of the combustion chamber heat shield plate 13. Thereafter, when flowing between the front surface 1a of the main body case and the heat shield plate 13 of the combustion chamber, the hot air (hatched portion in FIG. 2) staying above the front wall 13a of the heat shield plate is pushed out and discharged from the exhaust hole 15. Let it.

  Thus, between the main body case 1 and the combustion chamber heat shield plate 13, a flow of low-temperature air flowing from the outlet 23 outside the combustion chamber heat shield plate 13 to the exhaust hole 15 is generated. Since the flow of the low-temperature air promotes the discharge of the high-temperature air that stays, the temperature inside the main body case 1 can be kept low. Further, even when the amount of air introduced from the blower 2 is reduced due to clogging of the filter 4 and the temperature inside the main body case 1 is rapidly increased and an abnormal state of overheating is caused, the flow of air flowing through the exhaust hole 15 is increased. Therefore, high-temperature air can be discharged to the outside of the main body case 1. Thus, thermal damage caused by clogging of the filter 4 can be avoided.

  Further, like the flow of the air 2 indicated by the white arrow in FIG. 2, a part of the air flowing out of the outlet 23 is generated by the control board 19 arranged between the front surface 1 a of the main body case and the fuel container housing 18. It flows into the surroundings. After flowing around the control board 19, it joins the flow of the air 1 indicated by the white arrow in FIG. 2 and flows above the heat shield plate front wall 13 a, and is discharged from the exhaust hole 15. When the amount of air introduced from the blower 2 is reduced due to clogging of the filter 4 or the like, the temperature of the space in which the control board 19 is disposed may increase. Since the air flows through the control board 19, high-temperature air can be discharged around the control board 19 without being accumulated and the temperature rise can be suppressed. Therefore, thermal damage to the control board 19 can be avoided.

DESCRIPTION OF SYMBOLS 1 Main body case 2 Blower 3 Inlet opening 5 Outlet 6 Outlet opening 8 Burner 12 Combustion chamber main body 13 Combustion chamber heat shield plate 14 Hot air passage 15 Exhaust hole 18 Fuel container accommodation part 19 Control part (control board)
21 Contact surface (outer peripheral surface)
22 Contact surface (inner surface)
23 Outlet

Claims (4)

A main body case, an air outlet provided on the front surface of the main body case, a blower for taking in outside air into the main body case, a burner for generating combustion exhaust gas by combustion, and a combustion exhaust gas covering the flame of the burner upward. A combustion chamber main body to be discharged, and a combustion chamber heat shield provided so as to form a hot air passage between the combustion chamber main body and a mixture of combustion exhaust gas and air from the blower and leading to the outlet. An exhaust hole for discharging air between the main body case and the combustion chamber heat shield plate is provided on the front side of the main body case, and the blower is provided on the front side of the main body case. A warm air heater having a blowout opening to which an outlet is attached, wherein the exhaust hole is provided on a contact surface between the blowout opening and the blowout opening . The air outlet and the air outlet have a substantially rectangular shape, and the air outlet and the air outlet have four sides in contact with each other, and the exhaust hole is provided only on a contact surface of an upper side thereof. The hot air heater according to claim 1, wherein The blower is attached to an intake opening provided on a back surface of the main body case, and the combustion chamber heat shield plate is arranged so as to cover the intake opening, and a side surface of air from the blower. An outlet for allowing a part to flow out of the combustion chamber heat shield is provided, and the air flowing out of the outlet flows to the exhaust hole along the outside of the combustion chamber heat shield. claim 1 or 2 warm-air heating apparatus according. Inside the main body case, a fuel container housing part for housing a fuel storage container is provided, and between the front surface of the main body case and the fuel container housing part, the operation of the hot air heater is controlled. The hot air heater according to claim 3 , wherein a control unit is arranged, and a part of the air flowing out of the outlet flows around the control unit.

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