JP5111407B2 - Hot air heater - Google Patents

Description

  The present invention relates to a warm air heater having a means for discharging a drain in which water vapor in a combustion gas is condensed.

  2. Description of the Related Art Conventionally, as a drain discharge unit in the above-described hot air heater, one formed so as to reduce the leakage of combustion gas burned by the combustion unit into the room as follows is known. The first means is to seal the lower end of a drain pipe provided in the middle of the exhaust passage and to provide a small-diameter hole on the side surface of the upper drain pipe (see Patent Document 1). The second means is provided with an orifice in the drain pipe (see Patent Document 2). In the third means, the inner diameter of the drain discharge pipe is made small so that the exhaust gas does not leak due to the surface tension of the drain (see Patent Document 3).

Japanese Utility Model Publication No. 57-010658 Japanese Utility Model Publication No. 54-169937 Japanese Utility Model Publication No. 53-145752

  In the drain discharge means of the hot air heater, in the case of the first means, the drain stays in the drain pipe up to the height from the lower end of the drain pipe to the hole on the side face of the drain pipe. In the case of the second and third means, since a film is generated with the surface tension of the drain at the orifice of the drain pipe or the lower end of the drain discharge pipe, the drain pipe or the drain discharge pipe is generated until a water head that overcomes the surface tension of the drain is generated. Drainage is retained on the surface.

  That is, in the above prior art, since the drain stays in the drain pipe anyway, there is a problem that the drain pipe or the drain discharge pipe is corroded by the influence of the drain.

  An object of this invention is to provide the warm air heater which prevents that a drain pipe retains in a drain pipe in addition to reducing that the combustion gas combusted by the combustion means leaks indoors.

The present invention includes an intake means for taking in outdoor air, a combustion means to which air sucked by the intake means is supplied and fuel gas is supplied and combusted, and a combustion gas burned by the combustion means is exhausted outside the room. Exhaust means for conducting, heat exchange means provided in the exhaust means for conducting heat of the combustion gas to room air, and air blowing means for blowing the room air so that heat is conducted by the heat exchange means In the warm air heater comprising a drain discharge means for discharging the drain in which the water vapor in the combustion gas is condensed by the exhaust means, the drain discharge means has one end connected to the exhaust means and the other end connected to the exhaust means. is configured in a pipe shape which is open on board below the exhaust means, the other end portion is formed as a cylindrical portion of a small passage area enough to film by the surface tension of the drain in a plane perpendicular to the axis is generated, The tip of the serial tube portion, the film is formed on the inclined surfaces so as not to be generated by the surface tension of the drain to the axis of the cylindrical portion, the cylindrical portion, the oblique sides of the second end relative to the axis The inner diameter is crimped so as to be reduced toward the lower end .

According to the present invention, the other end portion constituting the drain discharge means is formed as a cylindrical portion having a small passage area so that a film is generated by the surface tension of the drain on the surface orthogonal to the axis. The area of the other end of the cylindrical portion is small enough to prevent the combustion gas burned by the combustion means from leaking into the chamber, and the surface tension of the drain formed at the tip of the cylindrical portion is inclined with respect to the axis. Since the area is so large that a film is not generated by this, the drain that has flowed into the cylindrical portion is discharged into the machine without generating a film due to surface tension. This prevents the drain from staying in the drain pipe.
Further, since the cylindrical portion is formed by caulking the side surface of the other end portion, the passage is small at the other end portion of the drain discharging means so that a film is generated by the surface tension of the drain on the surface orthogonal to the axis. A cylindrical portion having an area can be easily formed.

It is a front view which shows an example of a warm air heater. It is a side view which shows an example of a warm air heater. It is a back perspective view showing an example of a warm air heater. It is a figure which shows the reference example of the drain pipe used for a warm air heater. It is the figure which looked at the surface of the drain pipe from the direction of A shown by the arrow in FIG. It is a figure which shows the drain pipe used for the warm air heater of this invention . It is the figure which looked at the surface of the drain pipe from the direction of B shown by the arrow in FIG.

  As shown in FIG. 1, the hot air heater 10 has a combustion blower 14 mounted on the right side of a flat and horizontally long sheet metal casing 12, and a horizontally mounted cylindrical combustion cylinder 16 is installed at the bottom. A gas burner 18 as combustion means is provided at the right end of the combustion cylinder 16. Combustion air is supplied from the blowout port of the combustion blower 14, and fuel gas is supplied from the fuel gas supply mechanism 20 and burned. The

  As shown in FIGS. 2 and 3, on the back surface of the casing 12, the combustion gas burned by the outdoor air intake pipe 28, the air duct 26 and the gas burner 18 for introducing outdoor air to the combustion blower 14 is discharged to the outside. In order to secure the space for the exhaust outer pipe 40 and the exhaust duct 44 to be connected, the frame 22 is connected. The intake port 24 of the combustion blower 14 is an intake cylinder whose tip is closed, and protrudes rearwardly through the back surface. An air duct 26 is connected to the side surface of the intake port 24 and is connected to an outdoor air intake pipe 28 that is inserted into a hole (not shown) formed in the room wall so as to communicate the room and the outside in the frame 22. ing. In the present embodiment, the combustion blower 14, the outdoor air intake pipe 28, the air duct 26, the intake port 24, and the combustion blower 14 constitute the intake means of the present invention.

  Above the combustion cylinder 16 in the casing 12, a heat exchanger 30, which is a heat exchange means for conducting the heat of the combustion gas to room air, is installed horizontally. The left end of the combustion cylinder 16 and the left end of the heat exchanger 30 are connected by a connecting cylinder 32 having a rectangular cross section. An exhaust cylinder 34 is attached between the heat exchanger 30 and the combustion cylinder 16 in parallel with them. The right end of the heat exchanger 30 and the right end of the exhaust tube 34 are connected by a connecting tube 36 having a rectangular cross section. A front end portion 38 of the exhaust cylinder 34 is bent 90 degrees rearward, penetrates the back plate 12a and protrudes rearward to serve as an exhaust port of the gas burner 18, and within the frame 22 and into the outdoor air intake pipe 28. It is connected to an exhaust outer pipe 40 installed coaxially via an exhaust duct 44. In the present embodiment, the connecting cylinder 32, the connecting cylinder 36, the exhaust outer pipe 40, and the exhaust duct 44 constitute the exhaust means of the present invention.

  On the upper part of the casing 12, an elongated cylindrical heating air blowing fan 46 as a blowing means is installed horizontally. The heating air blowing fan 46 is a temperature formed in the lower part of the front plate 12b of the casing 12 by the indoor air sucked from the indoor air inlet 48 (see FIG. 3) formed in the upper part of the back plate 12a of the casing 12. It blows forward from the wind outlet 50 (refer FIG. 2). The room air flows around the heat exchanger 30, the exhaust cylinder 34, and the combustion cylinder 16, is heat-exchanged and heated, and is blown forward from the hot air outlet 50 at a high temperature. A humidifying water tray 52 that can be pulled out on the casing bottom plate 12c below the combustion cylinder 16 in the casing 12 is installed so that it can be pulled out forward.

  A concave portion 38 a that bulges downward is provided on the lower surface of the distal end portion 38 of the exhaust tube 34 to form a drain reservoir. An upper end 54 a of the drain pipe 54 is vertically connected to the recess 38 a, and the lower end 54 b of the drain pipe 54 is open and directed downward so that the drain is dropped into the humidifying water tray 52. .

As shown in FIG. 4, the drain pipe 54 given as a reference example includes an upper end portion 54 a that extends downward from the upper end by a predetermined distance, and an arc portion 54 c that extends downward from the upper end portion 54 a along the combustion cylinder 16 in an arc shape. And a lower end portion 54b extending a predetermined distance along the tangent line of the arc portion 54c.

  The lower end portion 54b of the drain pipe 54 is formed as a cylindrical portion where a film is generated by the surface tension of the drain on a plane orthogonal to the axis 54d, and the lower end 54e of the cylindrical portion is formed so that no film is generated by the surface tension of the drain. It is formed in an inclined shape with respect to the axial line 54d of the cylinder portion.

  As shown in FIG. 5, the drain pipe 54 has a cylindrical portion formed by caulking the side surface of the lower end portion 54b parallel to the axis 54d to form a caulking line 54g. An opening 54f is formed at the lower end 54e of the cylindrical portion.

The lower end 54b of the reference example of the drain pipe 54 is an inner diameter which is constant in the straight pipe, in the embodiment of the present invention, as shown in FIGS. 6 and 7, the side surface of the lower end portion 56 b of the drain pipe 56 the crimped to form a caulking line 56g so as to be oblique to the axis 56 d, the inner diameter of the cylindrical portion is formed so as to decreases in diameter toward the lower end. The opening 56f at the lower end 56e has a smaller area than the opening 54f in FIG. 5 and can further prevent the combustion gas from leaking into the room.

Lower end 54b constituting a de Renpaipu 54, since the film by the surface tension of the drain in a plane perpendicular to the axis 54d is formed as a cylindrical portion of a small passage area enough to be produced, the lower end of such cylindrical portion The area of the portion 54b is small enough to prevent the combustion gas burned by the gas burner 18 from leaking into the chamber, and the tip 54e of the cylindrical portion is formed in an inclined shape with respect to the axis 54d, and the membrane is formed by the surface tension of the drain. Since the area is so large that it is not generated, the drain that has flowed into the cylindrical portion is discharged into the machine without generating a film due to surface tension. This prevents the drain from staying in the drain pipe 54.

Further, since the cylindrical portion is formed by caulking the side surface of the lower end portion 54b, the lower end portion 54b of the drain pipe 54 has a passage area that is so small that a film is generated by the surface tension of the drain on the surface orthogonal to the axis 54d. It can be easily formed as a cylindrical portion.

DESCRIPTION OF SYMBOLS 10 ... Warm air heater, 12 ... Casing, 12a ... Back plate, 12b ... Front plate, 12c ... Bottom plate, 14 ... Combustion blower, 16 ... Combustion cylinder, 18 ... Gas burner, 20 ... Fuel gas supply mechanism, 22 ... Frame , 24 ... Intake port, 26 ... Air duct, 28 ... Outdoor air intake pipe, 30 ... Heat exchanger, 32 ... Connection cylinder, 34 ... Exhaust cylinder, 36 ... Connection cylinder, 38 ... Tip, 38a ... Recess, 40 ... Exhaust Outer pipe, 44 ... exhaust duct, 46 ... heating air blowing fan, 48 ... indoor air inlet, 48 combustion chamber, 50 ... warm air outlet, 52 ... humidifying water dish , 56 ... drain pipe , 56a ... upper end 5 6b ... lower end part , 5 6c ... circular arc part , 5 6d ... lower end , 5 6e ... lower end , 5 6f ... opening , 5 6g ... caulking line.

Claims (1)

Intake means for taking in outdoor air, combustion means for supplying and burning fuel gas supplied by the intake means, and exhaust means for exhausting combustion gas burned by the combustion means to the outside A heat exchanging means provided in the exhaust means for conducting the heat of the combustion gas to room air, a blower means for blowing the indoor air so that heat is conducted by the heat exchange means, and the exhaust means In the hot air heater comprising a drain discharge means for discharging drain condensed water vapor in the combustion gas,
The drain discharge means is configured in a pipe shape having one end connected to the exhaust means and the other end opened to the inside of the machine below the exhaust means.
The other end portion is formed as a cylindrical portion having a small passage area such that a film is generated by the surface tension of the drain on a surface orthogonal to the axis line,
The tip of the cylindrical part is formed in a slope shape so that a film is not generated by the surface tension of the drain with respect to the axis of the cylindrical part ,
The hot air heater according to claim 1, wherein the cylindrical portion has a shape in which an inner diameter is reduced toward a lower end by caulking a side surface of the other end portion to be inclined with respect to an axis .

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