JP5119199B2 - Gas fan heater with electric heater - Google Patents

Description

  The present invention relates to a gas fan heater with an electric heater.

  Conventionally, a gas fan heater has a ventilation case that communicates with an air intake port, a lower end portion of the air flow case, and an air outlet in an airframe having an air outlet formed in a lower portion of the front surface and an air intake port on a rear surface. Are mixed in the fan case, the combustion case that is disposed in the ventilation case and contains the burner, and the combustion gas discharged from the upper end of the combustion case and the air sucked in from the intake port. A main ventilation path in the ventilation case for guiding and a bypass ventilation path in the lower part of the ventilation case for directly guiding the air sucked from the lower part of the intake port to the fan case are provided.

  A so-called gas fan heater with an electric heater provided with an electric heater in order to accelerate the rise of the room temperature at the beginning of operation is known from Patent Document 1, for example. In this device, an electric heater is attached to the intake port, and this electric heater is operated for a certain period of time at the beginning of operation, for example.

  By the way, in the gas fan heater, a filter that covers the air intake port is attached to the air intake port on the rear surface of the airframe. However, when an electric heater is attached to the air intake port as described in Patent Document 1, a filter is installed behind the electric heater. It becomes necessary to mount the filter, the mounting position of the filter shifts backward, and the entire gas fan heater becomes large.

  In addition, when the rotation of the fan stops for some reason during operation of the electric heater (so-called fan lock), the electric heater is controlled so that energization is immediately stopped. However, since it is lighter than the cooler ambient air, it may rise from the upper part of the air intake and overheat the upper part of the fuselage. In this case, if the upper part of the airframe is made of resin for reasons such as improvement in design, the upper part of the airframe may be melted and deformed or damaged by hot air.

JP-A-5-34010

  In view of the above points, it is an object of the present invention to provide a gas fan heater with an electric heater that does not cause an increase in size and that does not overheat the upper part of the airframe when a fan lock occurs. It is.

In order to solve the above problems, a gas fan heater with an electric heater according to the present invention has an airframe having an air outlet formed at the lower part of the front surface and an air inlet that is covered with a filter at the rear surface. A ventilation case that communicates with the intake port, a fan case that communicates the lower end of the ventilation case and the air outlet, a fan is built in, a combustion housing that is disposed in the ventilation case and incorporates a burner, and the fan The main ventilation path in the ventilation case that mixes the combustion gas discharged from the upper end of the combustion housing with the air sucked from the intake port and leads it to the fan case, and the operation of the fan , comprising a bypass air passage of the lower in a ventilated casing for guiding the air drawn from the bottom directly into the fan case through the lower combustion housing, and that the electric heater is provided in the bypass air passage And butterflies.

  According to the present invention, since the electric heater is provided in the bypass ventilation passage, unlike the conventional example in which the electric heater is provided in the vent hole, it is not necessary to shift the filter mounting position backward, and the enlargement of the gas fan heater can be avoided. .

  In addition, when fan lock occurs, the hot air due to the residual heat of the electric heater rises from the lower part of the intake port, but before it reaches the upper part of the fuselage, it is absorbed by the filter or cooled by the surrounding air Thus, overheating of the upper part of the fuselage is suppressed. As a result, even if the upper part of the fuselage is made of resin for reasons such as improving design, the upper part of the fuselage is not melted and deformed or damaged by hot air.

  By the way, it is conceivable to provide an electric heater in the main ventilation path in order to suppress overheating of the upper part of the airframe when a fan lock occurs. However, in this case, during the simultaneous operation of the electric heater and the gas burner, a high-temperature mixed gas of combustion gas and air from the combustion housing flows through the electric heater. For this reason, the heating efficiency by an electric heater worsens. On the other hand, in the present invention, since only room temperature air sucked from the air inlet flows to the electric heater, the heating efficiency is improved.

Sectional drawing explaining the structure of the gas fan heater with an electric heater of embodiment of this invention.

  Hereinafter, a gas fan heater with an electric heater according to an embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 1, reference numeral 1 denotes a gas fan heater body with an electric heater. The airframe 1 is made of sheet metal except for the upper part 1a, and the upper part 1a is made of resin for improving design. An air outlet 11 is formed in the lower front portion of the body 1. A plurality of upper and lower intake ports 12 are formed on the rear surface of the airframe 1 over a range from a position slightly below the upper portion 1 a to a position slightly above the air outlet 11. A filter 2 made of, for example, a metal wire assembled in a lattice shape is detachably attached to the rear surface of the airframe 1 so as to cover the air inlet 12.

  A ventilation case 3 that communicates with the air inlet 12 and a fan case 4 that communicates the lower end of the ventilation case 3 and the air outlet 11 are provided in the airframe 1. In the ventilation case 3, a combustion housing 5 containing a gas burner B having a known structure is provided. The combustion housing 5 is provided with an air intake port 5 a that is open at the upper end and communicates with the intake port 12 at the lower back. Then, the fan case is passed through the main ventilation path 31 formed in the upper part and the front part of the ventilation case 3 while the combustion gas discharged from the upper end of the combustion housing 5 and the air sucked from the intake port 12 are mixed. Led to 4.

  The fan case 4 is provided with a convection fan 6 driven by a motor (not shown). Further, a bypass ventilation path 32 is formed in the lower part of the ventilation case 3 so that the air sucked from the lower part of the intake port 12 is directly guided to the fan case 4. In the present embodiment, the electric heater 7 is provided in the bypass ventilation path 32.

  As the electric heater 7, a known one such as a red heat heater is used. The electric heater 7 is operated together with the gas burner B for a certain period at the beginning of heating to accelerate the rise of the room temperature. When the room temperature is higher than the set temperature, the temperature is raised to a predetermined upper limit temperature to be set and the combustion of the gas burner B is stopped, and after-purging is performed by continuously operating the convection fan 6, The electric heater 7 is operated so as not to give a cold wind feeling.

  Here, in this embodiment, since the electric heater 7 is provided in the bypass ventilation path 32, unlike the conventional example in which the electric heater is provided at the vent, it is not necessary to shift the mounting position of the filter 2 backward. For this reason, the enlargement of the gas fan heater with an electric heater can be avoided. Moreover, the electric heater 7 can be attached in the bypass ventilation path 32 and can be configured as a gas fan heater with an electric heater without changing the configuration of the existing gas fan heater.

  In addition, when a fan lock occurs during operation of the electric heater 7, the electric heater 7 is controlled so that energization is immediately stopped, but the intake air through which the hot air due to the residual heat of the electric heater 7 leads to the bypass passage 32 is controlled. 12 Ascend from the bottom. However, overheating of the upper part 1a of the airframe 1 is suppressed by being absorbed by the filter 2 or being cooled by ambient air before reaching the upper part 1a of the airframe 1. As a result, even if the upper part 1a of the machine body 1 is made of resin, the upper part 1a of the machine body 1 is not melted and deformed or damaged by hot air.

  By the way, it is conceivable to provide the electric heater 7 in the main ventilation path 31 in order to suppress overheating of the upper part 1a of the airframe 1 when the fan lock occurs. However, during the simultaneous operation of the electric heater 7 and the gas burner B, the electric heater 7 has a mixed gas having a temperature of about 200 to 300 ° C. in which the combustion gas from the combustion housing 5 and the air from the intake port 12 are mixed. It will flow, and the heating efficiency by the electric heater 7 will worsen. On the other hand, in the above embodiment, only room temperature air sucked from the air inlet 12 flows into the electric heater 7, so that the heating efficiency is improved.

  The gas fan heater with electric heater of the present embodiment has been described above, but the present invention is not limited to the above. For example, the type or the like of the electric heater 7 disposed in the bypass passage 32 can be appropriately selected, and the ventilation case 3 and the fan case 4 may be integrally formed.

  DESCRIPTION OF SYMBOLS 1 ... Airframe, 11 ... Air outlet, 12 ... Air inlet, 3 ... Ventilation case, 31 ... Main ventilation passage, 32 ... Bypass ventilation passage, 4 ... Fan case, 5 ... Combustion housing, 6 ... Fan (convection fan), 7 ... Electric heater, B ... Gas burner (burner),

Claims (1)

It has a fuselage with an air outlet formed in the lower part of the front and an air inlet that is covered with a filter on the back.
In this fuselage, a ventilation case communicating with the intake port,
A fan case in which the lower end of the ventilation case and the air outlet are communicated with each other,
A combustion housing which is arranged in a ventilation case and contains a burner;
By operating the fan, the main ventilation path in the ventilation case that mixes the combustion gas discharged from the upper end of the combustion housing and the air sucked from the intake port and leads to the fan case,
By the operation of the fan, a bypass ventilation path in the lower part of the ventilation case that directly guides the air sucked from the lower part of the intake port to the fan case through the lower part of the combustion housing ,
An electric heater with an electric heater, wherein an electric heater is provided in the bypass ventilation path.

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