JP5313940B2 - Gas fan heater - Google Patents

Description

  The present invention relates to a gas fan heater, and more particularly, to a configuration that can reliably detect fuel gas leaked due to poor connection of a gas hose to a gas inlet.

  Conventionally, as a gas fan heater, in a machine body in which a blower outlet is formed in the lower part of the front surface, a ventilation case containing a combustion housing with a built-in burner, and a fan case containing a fan connecting the ventilation case and the blower outlet, For example, Patent Document 1 discloses a device provided with a control room in which a control device including a burner valve, which is located on the side of a ventilation case and a fan case, is arranged. In this gas fan heater, an air intake port communicating with the ventilation case is formed on the rear surface of the machine body, and air sucked into the ventilation case from the intake port by the operation of the fan is blown as warm air by mixing of combustion gas from the combustion housing. It comes to blow out from the exit.

  A vent is also formed in the control room side portion on the back of the machine. When fuel gas is injected from the ventilation case toward the end opening of the mixing tube portion of the burner that protrudes into the control chamber, air is also sucked in from the vent on the control chamber side due to the ejector effect, and enters the mixing tube portion of the burner. Primary air is supplied. Below the vent on the control room side, a gas inlet (gas hose connection port) connected to the burner valve is provided so as to protrude from the back surface of the machine body.

  The gas inlet has a stepped shape having a large-diameter portion that receives the end surface of the gas hose, and includes a hose connection pipe portion that is parallel to the rear surface of the machine body. And a user connects a gas hose to a hose connection part. Here, if there is a poor connection of the gas hose to the gas inlet, fuel gas leaks. In the above-mentioned Patent Document 1, a sensor for detecting fuel gas is provided in a region in the control chamber that generates a flow of primary air from the vent toward the mixing pipe portion of the burner, and leakage of the fuel gas at the gas inlet is detected. I am doing so.

  However, during the operation of the gas fan heater, the suction force at the ventilation port on the ventilation case side is very strong compared with the suction force at the ventilation port on the control room side. An air flow toward the mouth will occur. For this reason, most of the leaked fuel gas is sucked into the intake port on the ventilation case side. As a result, if the sensor is provided between the vent on the control room side and the mixing tube portion of the gas burner as described in Patent Document 1, the fuel gas due to poor gas hose connection to the gas inlet during operation of the gas fan heater May not be detected reliably.

JP 2008-309346 A

  In view of the above points, an object of the present invention is to provide a gas fan heater configured to reliably detect leakage of fuel gas due to poor connection of a gas hose to a gas inlet.

  In order to solve the above-mentioned problems, the present invention accommodates a ventilation case in which a combustion housing containing a burner is housed in a machine body in which a blower outlet is formed in the lower part of the front surface, and a fan that connects the ventilation case and the blower outlet. And a control room in which a control device including a valve for a burner located on the side of the ventilation case and the fan case is provided, and an intake port communicating with the ventilation case is formed on the rear surface of the fuselage. This is a gas fan heater in which the air sucked into the ventilation case from the intake port by the operation of the fan becomes warm air due to the mixing of combustion gas from the combustion housing and blows out from the outlet, The part is formed with a vent for supplying primary air from the ventilation case to the mixing pipe part of the burner projecting into the control chamber, and connected to the burner valve below the vent. The gas inlet is provided so as to protrude from the back surface of the fuselage, and the gas inlet has a stepped shape having a large diameter portion that receives the end face of the gas hose and includes a hose connection pipe portion parallel to the back surface of the fuselage. The gas inlet is equipped with a diffusion plate that extends radially outward from the large diameter part of the hose connection pipe part along the surface perpendicular to the axis of the hose connection pipe part. A through hole is formed near the gas inlet and in a range where the fuel gas leaked due to poor connection of the gas hose to the hose connection pipe part hits the diffusion plate, and the fuel gas is detected by facing the through hole. A sensor is provided.

  According to the present invention, the gas hose is connected to the hose connecting pipe portion because the gas inlet is provided with the diffusion plate even when a strong air flow from the gas inlet to the air inlet on the ventilation case side is generated during operation of the gas fan heater. The fuel gas leaked due to a defect does not directly flow into the airflow toward the intake port, but diffuses so as to strike the diffusion plate and expand outward in the radial direction. And since the sensor is provided near the gas inlet near the gas inlet and located in the range where the leaked fuel gas hits the diffusion plate and diffuses, the leaked fuel gas reaches the sensor In addition, it is possible to reliably detect fuel gas leakage. In the present invention, for example, when the operation of the gas fan heater is stopped, the leaked fuel is similarly generated when no airflow is generated toward the air intake on the ventilation case side or when the airflow is weak. By once diffusing the gas, leakage of the fuel gas can be reliably detected.

  By the way, when the specific gravity of the fuel gas is lighter than air, it is desirable to provide the through hole above the gas inlet, and when the specific gravity of the fuel gas is heavier than air, it is desirable to provide the through hole below the gas inlet. . And when providing a through-hole above a gas inlet, it is preferable to provide the cover which opens below so that a sensor may be enclosed in the back surface of a body. According to this, the fuel gas diffused by hitting the diffusion plate is efficiently collected in the cover, and the leakage of the fuel gas can be detected more reliably. Moreover, due to the presence of the cover, it is possible to prevent water spilled accidentally from being applied to the sensor or being subjected to an impact.

The perspective view which shows the gas fan heater of embodiment of this invention. The front view which shows the gas fan heater shown in FIG. 1 in the state which removed the front panel. Sectional drawing along the III-III line of FIG. The rear view which shows the gas fan heater shown in FIG. 1 in the state which removed the back panel. Sectional drawing along the VV line | wire of FIG. FIG. 3 is an exploded perspective view illustrating a configuration around a sensor unit.

  Hereinafter, a gas fan heater according to an embodiment of the present invention will be described with reference to the drawings, taking as an example the case where natural gas having a specific gravity lighter than air is used as fuel gas. 1 to 4, reference numeral 1 denotes a gas fan heater body. An air outlet 11 is formed in the lower front portion of the body 1. In the airframe 1, a ventilation case 2 containing a burner 21 and containing a combustion housing 22 having an open upper end, and a fan case 3 containing a convection fan 31 connecting the ventilation case 2 and the air outlet 11, Is provided.

  Further, a control room 4 is provided in the airframe 1 so as to be located on the side of the ventilation case 2 and the fan case 3 (right side portion in FIG. 2). The control chamber 4 houses control devices such as a valve 5 for the burner 21, a control unit 6 such as a microcomputer for controlling the operation of the gas fan heater, and a motor 7 for rotationally driving the fan 31. Further, the mixing tube portion 21 a of the burner 2 is provided so as to protrude into the control chamber 4, and the illustration is omitted provided at the end portion of the gas supply tube 51 from the valve 5 with respect to the end opening of the mixing tube portion 21 a. The fuel gas is injected from the gas nozzle.

  As shown in FIGS. 3 and 4, an air inlet 12 communicating with the ventilation case 2 is formed on the rear surface of the body 1. Then, the air sucked into the ventilation case 2 from the intake port 12 by the operation of the fan 31 is mixed with combustion gas from the combustion housing 22 and is blown out from the blowout port 11. A vent 13 is also formed in a portion of the rear surface of the machine body 1 on the control room 4 side. Then, due to the ejector effect when the fuel gas is injected from the gas nozzle toward the end opening of the mixing tube portion 21 a, air is also sucked from the vent 13 on the control chamber 4 side, and is primarily supplied to the mixing tube portion 21 a of the burner 21. Air is supplied.

  A gas inlet 8 piped to the valve 5 is provided on the back surface of the machine body 1 below the vent 13 on the control room 4 side so as to protrude from the back surface of the machine body 1. The gas inlet 8 has a main body 81 having a gas passage inside, a shaft tube portion 82 rotatably inserted into the back side opening of the main body 81, and is bent so as to be parallel to the rear surface of the body 1 from the shaft tube portion 82. The hose connecting pipe portion 83 is configured.

  The hose connecting pipe portion 83 has a stepped shape having a large diameter portion 84 that receives the end face of the gas hose H indicated by a two-dot chain line in FIG. 4. Then, the user connects the gas hose H to the hose connection pipe portion 83. At this time, the user rotates the hose connection pipe 83 with the shaft pipe 82 as the center of rotation, aligns the gas hose H in a direction in which excessive stress is not applied, and the end face of the gas hose H on the large diameter part 84. The gas hose H is connected by extrapolation until the abuts. The gas hose H is connected to the hose connecting pipe portion 83 over the floor surface from a gas stopper provided in a room where the gas fan heater is used. For this reason, it is set as the attitude | position which the front-end | tip of the hose connection pipe part 83 faces a horizontal direction (width direction of the body 1) normally.

  By the way, if there is a poor connection of the gas hose H to the hose connection pipe portion 83, the fuel gas leaks. For this reason, it is necessary to configure the gas fan heater so that fuel gas leakage can be reliably detected. In the present embodiment, as shown in FIGS. 4 to 6, the gas inlet 8 is radially outward from the large-diameter portion 83 of the hose connection pipe portion 83 along a surface orthogonal to the axis of the hose connection pipe portion 83. An extended diffusion plate 85 is provided. Further, the range in which the fuel gas leaked by the poor connection of the gas hose H to the hose connection pipe 83 hits the diffusion plate 85 in the portion on the control room 4 side on the back of the machine body 1 near the gas inlet 8. A through hole 14 is formed at the position of the sensor S, and a sensor S for detecting the fuel gas is provided facing the through hole 14. A cover 15 that opens downward is provided so as to surround the through hole 14.

  As the sensor S, a semiconductor sensor or the like that detects methane contained in the fuel gas is used. When the fuel gas is detected by the sensor S, the control unit 6 notifies the leakage of the fuel gas. In the present embodiment, a rectangular opening 16 is formed on the rear surface of the machine body, and a through hole 14 and a cover 15 are integrally formed on a cover plate 17 that closes the opening 16.

  According to the gas fan heater of the above embodiment, during the operation of the gas fan heater, a strong air flow is generated from the gas inlet 8 toward the air inlet 12 on the ventilation case side. However, the gas inlet 8 includes the diffusion plate 85. Therefore, the fuel gas leaked due to the poor connection of the gas hose H to the hose connection pipe portion 83 does not directly flow into the airflow toward the intake port 12 but diffuses so as to hit the diffusion plate 85 and expand outward in the radial direction ( (Refer to a flow indicated by an arrow in FIG. 4).

  And the sensor S is provided facing the through-hole 14 formed so as to be closer to the gas inlet 8 than the vent 13 on the control chamber 4 side and located in a range where the leaked fuel gas hits the diffusion plate 85 and diffuses. Therefore, the leaked fuel gas reaches the sensor S. Further, since the cover 15 that opens downward is provided so as to surround the through hole 14, the fuel gas that has diffused upward by hitting the diffusion plate 85 is efficiently collected in the cover 15. As a result, fuel gas leakage can be reliably detected. Moreover, due to the presence of the cover 15, it is possible to prevent water spilled accidentally from being applied to the sensor S or being subjected to an impact.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said thing. In the above embodiment, the case where natural gas having a lighter specific gravity than air is used as the fuel gas has been described as an example. However, the present invention can also be applied to a case where a fuel gas having a higher specific gravity than air, for example, propane gas. In such a case, a through hole may be provided below the gas inlet, and a sensor for detecting propane may be provided so as to face the through hole.

  DESCRIPTION OF SYMBOLS 1 ... Airframe, 11 ... Air outlet, 12 ... Ventilation case side inlet, 13 ... Control room side vent, 14 ... Through hole, 15 ... Cover, 2 ... Ventilation case, 21 ... Burner, 21a ... Mixing pipe part , 22 ... Fuel housing, 3 ... Fan case, 31 ... Convection fan (fan), 4 ... Control room, 5 ... Valve, 8 ... Gas inlet, 83 ... Hose connection pipe part, 84 ... Large diameter part, 85 ... Diffusion plate , S: Sensor.

Claims (2)

A ventilation case containing a combustion housing with a built-in burner, a fan case containing a fan connecting the ventilation case and the outlet, and a side of the ventilation case and the fan case. And a control room in which control devices including a burner valve are arranged are provided.
An air inlet communicating with the ventilation case is formed on the back of the fuselage, and the air sucked into the ventilation case from the air intake by the operation of the fan is blown out from the outlet as hot air due to the mixing of combustion gas from the combustion housing A gas fan heater,
A vent for supplying primary air to the mixing tube portion of the burner protruding from the ventilation case to the control chamber is formed in the control chamber side portion on the back of the machine body, and a burner valve is provided below the vent. A gas inlet connected to the pipe is provided so as to protrude from the rear surface of the fuselage, and the gas inlet has a stepped shape having a large-diameter portion that receives the end face of the gas hose and is parallel to the rear surface of the fuselage. In what comprises
The gas inlet includes a diffusion plate extending radially outward from the large diameter portion of the hose connection pipe portion along a surface orthogonal to the axis of the hose connection pipe portion,
A through hole is formed in the control room side part on the back of the fuselage so that it is closer to the gas inlet than the vent and in a range where the fuel gas leaked due to poor connection of the gas hose to the hose connection pipe part hits the diffusion plate and diffuses. A gas fan heater comprising a sensor for detecting fuel gas facing the through hole. The gas fan heater according to claim 1, wherein the through hole is provided above the gas inlet.
A gas fan heater, characterized in that a cover that opens downward is provided on the rear surface of the airframe so as to surround the through hole.

Images