JPH0646113U - Gas combustion hot air generator - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a gas-fired hot-air generator that has low unburned components in combustion exhaust gas and high heat utilization efficiency. [Structure] A gas combustion pipe (1), a blower (2), and a joint that can be connected to a desired gas supply pipe (13) are provided, and the blower (2) is connected to the exhaust side end of the gas combustion pipe (1). A gas nipple (12) for connecting to, and a fan (31) for blowing hot air, which is provided so as to face one side surface of the gas combustion pipe (1),
In a gas combustion type hot air generator comprising a device (4) for controlling the amount of combustion gas and an intake amount of combustion air for adjusting the temperature of hot air blown out, the exhaust gas of a gas combustion pipe (1) The above-mentioned gas combustion type hot air generator, wherein a gas recirculation pipe (11) for recirculating a part of the combustion exhaust gas blown out from the side end portion to the upstream part of the gas combustion pipe (1) is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas-fired hot-air generator used in operations requiring relatively high temperatures such as baking coating, food drying, and gloss printing.

[0002]

[Prior art]

 Currently used gas combustion type heating devices are those that use the combustion exhaust gas of the gas by directly discharging it into the device, and the combustion exhaust gas generated in the gas combustion pipe is discharged to the outside as well as the combustion pipe. There is also a so-called clean heater that blows air to obtain hot air, but the former has a problem that the odor is extremely harmful because the exhaust gas contains unburned components. The latter device has the disadvantage that heat is wasted because it is discharged into the outside air without using the heat of the combustion exhaust gas, and this device also emits unburned gas outdoors along with the combustion exhaust gas. There is a problem that it pollutes the atmosphere.

[0003]

[Problems to be solved by devising]

 The present invention has been made to solve the above problems, and the purpose thereof is to completely burn the combustion, so that even if the combustion exhaust gas is directly emitted into the room, odor and environmental pollution are generated. In other words, it is to supply a heating device that can effectively use the heat of combustion exhaust gas.

[0004]

[Means for Solving the Problems]

 The above problem is that in a device that blows air to a gas combustion pipe to obtain hot air, a part of the combustion exhaust gas discharged from the gas combustion pipe is recirculated to the upstream portion of the combustion pipe and recombusted. Will be solved.

[0005]

[The best mode for carrying out the invention]

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing the structure of a spirally wound gas combustion pipe used in the hot air generator according to the present invention and its related parts, and FIG. 2 shows the joint between the gas combustion pipe and the gas reflux pipe. Fig. 3 is a cross-sectional view showing the joint between the center end of the gas combustion pipe and the gas recirculation pipe, and Fig. 4 is the gas combustion pipe shown in Fig. 1 in a box shape together with a fan for blowing hot air. FIG. 5 is a perspective view of the hot air generator, which is housed in a case, viewed from the fan side. FIG. 5 is a view of the hot air generator using a funnel-shaped case different from that shown in FIG. 4, viewed from the gas combustion tube side. It is a partially broken perspective view.

Further, in the figure, 1 is a spirally wound gas combustion pipe, 11 is a gas recirculation pipe, 12 is a gas nipple, 13 is a gas supply pipe, 14 is a sensor cord, 15 is an igniter cord, and 2 is A blower, 21 is a blower control code, 22 is an earth cord, 3 is a box-shaped case, 30 is a funnel-shaped case, 31 is a fan, and 4 is a controller.

First, FIGS. 1, 2, and 3 will be described. The gas combustion pipe 1 is wound in a spiral shape, and a gas nipple 12 having a connection joint connected to a desired gas supply pipe 13 is provided at the outer peripheral side end portion thereof. A blower 2 that takes in outside air for combustion is connected. A pilot fire sensor is provided near the gas nipple 12 to prevent leakage of unburned gas when the pilot fire has not ignited. The control device 4 controls the combustion gas amount and the combustion air amount as well as the ignition operation and the automatic stop of the gas at the time of misfire. Further, a ground 22 is attached to the blower 2 for safety.

Further, in the device of the present invention, the gas recirculation pipe 11 connects the center side end of the gas combustion pipe 1 and the portion near the outer peripheral side end. It is recommended that the diameter of the gas recirculation pipe 11 be about half that of the gas combustion pipe 1. At the joint between the center side end of the gas combustion pipe 1 and the gas recirculation pipe 11, one end of the gas recirculation pipe 11 expands like a funnel and is inserted coaxially into the gas combustion pipe 1. An appropriate gap is maintained between the enlarged maximum diameter portion of the gas recirculation pipe 11 and the inner wall of the gas combustion pipe 1, and a considerable portion of the combustion exhaust gas passing therethrough is upstream of the gas combustion pipe 1. It is supposed to be returned to the side.

At the joint between the gas recirculation pipe 11 and the portion close to the outer peripheral side of the gas combustion pipe 1, the two are connected at an acute angle so that the gas can be smoothly merged. Although not shown here, it is desirable to reduce the inner diameter of the gas combustion pipe 1 in this portion, reduce the static pressure of the joint portion by the Venturi effect, and suck the combustion exhaust gas.

Next, FIG. 4 will be described. The case 3 is a flat box made of a non-combustible material, and has an air inlet on its rear surface and a hot air outlet on its front surface. Inside the case 3, the gas combustion pipe 1 shown in FIG. 1 is attached, and a fan 31 is provided toward the gas combustion pipe 1 on the air intake side thereof. In addition, a temperature sensor is installed around the hot air outlet to automatically adjust the air-fuel mixture to keep the hot air temperature constant.

When the ignition button of the control device 4 is pressed, the blower 2 first operates to blow air into the gas combustion pipe 1, and the gas combustion pipe is ventilated for a while. Then, the gas plug for the pilot fire opens, the spark plug ignites the pilot fire, and when the ignition is confirmed, the main gas valve opens and the mixture of combustion air and gas sent from the blower 2 is released. It is sent into the gas combustion pipe 1 and ignites and burns.

The combustion exhaust gas generated as a result of combustion flows toward the center side of the gas combustion pipe 1, but a considerable part of the combustion exhaust gas passes through the gas recirculation pipe 11 connected to the end portion of the gas combustion pipe 1. It returns to the upstream side of 1 and re-combusts. The remaining combustion exhaust gas is not recirculated by the gas recirculation pipe 11, passes through the gap between the inner wall of the gas combustion pipe 1 and the enlarged end portion of the inserted gas recirculation pipe 11, and is discharged to the outside. The reburning under reflux significantly reduces unburned components contained in the exhaust gas.

The air sent by the fan 31 comes into contact with the gas combustion tube 1 to become hot air, and is sent toward the target object together with the combustion exhaust gas discharged from the tip of the gas combustion tube 1. When using the devised device, there is no waste of heat and the heat can be used efficiently.

Next, FIG. 5 will be described. This is an embodiment using a case 30 having a shape different from that of the box-shaped case 3 shown in FIG. The front surface of the case 30 has a large-diameter cylindrical shape, but its back portion has a funnel-shaped diameter, and its end has a small-diameter cylindrical shape.

Thus, the gas combustion tube 1 is housed in the large-diameter cylindrical portion, and the fan 31 is attached to the small-diameter cylindrical portion. The structure, operation, and effect of the other parts of this device are the same as those in the case of using the above-mentioned box-shaped case, and therefore description thereof is omitted.

The configuration of the present invention is not limited to the above embodiment, and the shapes of, for example, the gas combustion pipe, the fan, and the case for housing them can be freely modified within the scope of the object of the present invention. The present invention includes all of them.

[0017]

[Effect of device]

 Since the present invention is constructed as described above, according to the present invention, the air pollution can be reduced by returning and reburning the unburned gas, and the heat of the combustion exhaust gas can be used without waste. Therefore, the combustion heat can be efficiently used.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a gas combustion tube wound in a flat spiral shape and its related portion used in a hot air generator according to the present invention.

2 is a cross-sectional view showing a connecting portion between a gas combustion pipe and a gas recirculation pipe shown in FIG.

3 is a cross-sectional view showing a connecting portion between a center side end portion of the gas combustion pipe shown in FIG. 1 and a gas recirculation pipe.

FIG. 4 is a perspective view of a hot air generating device in which the gas combustion tube shown in FIG. 1 is housed in a box-shaped case together with a fan for blowing hot air from the fan side.

5 is a partially cutaway perspective view of a hot air generator using a funnel-shaped case different from that shown in FIG. 4, as viewed from the gas combustion tube side.

[Explanation of symbols]

 1 --- gas combustion pipe 11 --- gas recirculation pipe 12 --- gas nipple 13 --- gas supply pipe 14 --- sensor cord 15 ・ ・ ・ ・ Ignition device code 2 ・ ・ ・ ・ ・ ・ Blower 21 ・ ・ ・ ・ ・ ・ Blower control code 22 ・ ・ ・ ・ Earth 3 ・ ・ ・ ・ ・ ・ Box case 30 ・ ・ ・ ・ Funnel case 31 ・ ・ ・ ・ ・ ・ ・ ・ Fan 4 ・ ・ ・ ・ ・ ・ Control device

Claims (2)

[Scope of utility model registration request] 1. A gas combustion pipe (1), a blower (2), and a joint for connecting to a desired gas supply pipe (13), wherein the blower (2) is connected to the exhaust side of the gas combustion pipe (1). A gas nipple (12) connecting to the end, a fan (31) for blowing hot air provided opposite one side of the gas combustion pipe (1), and a combustion gas for adjusting the temperature of the blown hot air. (4) for controlling the amount and the intake amount of combustion air, and a part of the combustion exhaust gas blown from the exhaust side end of the gas combustion pipe (1) in a gas combustion type hot air generator comprising: The above-mentioned gas combustion type hot air generator, characterized in that a gas recirculation pipe (11) for recirculation is provided in the upstream portion of the gas combustion pipe (1). 2. The end of a gas recirculation pipe (11) connected to the exhaust side end of the gas combustion pipe (1) is coaxial with the inside of the opening of the gas combustion pipe (1) on the exhaust side. Has been inserted,
The gas combustion type hot air generator according to claim 1, wherein the gas combustion pipe (1) is expanded in a funnel shape with an appropriate gap left between the gas combustion tube and the inner wall surface.