JPH0144918Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a proportionally controlled forced intake/exhaust combustion device.

Generally, in this type of forced intake/exhaust type combustion equipment, the main body of the combustion equipment is communicated with the outdoors through an intake/exhaust device.If the exhaust temperature is low, dew condenses in the exhaust pipe, and the exhaust pipe corrodes after long-term use. Contamination with intake air may occur, which poses a safety problem.

However, in conventional devices of this kind, especially proportional control type water heaters, the combustion amount is controlled only to stabilize the temperature of the hot water, and the exhaust temperature is not monitored.

The present invention is intended to prevent the above-described drop in exhaust gas temperature, and the structure of the present invention will be specifically explained below based on an embodiment shown in the drawings.

1 is mainly a forced intake/exhaust type combustion device;
Inside is a heat exchanger 2, a gas burner 3 that heats the heat exchanger 2, and an exhaust pipe 4 connected to the top of the heat exchanger 2.
A fan 5 and a controller 6 are provided. 7
9 is a water control valve installed in the water inlet pipe 10 leading to the heat exchanger 2; 11 is a temperature for detecting the hot water temperature at the outlet of the heat exchanger 2; It is a detector.

Reference numeral 12 denotes an intake/exhaust device that includes an intake pipe 13 that communicates between the inside of the main body 1 and the outdoors, and an exhaust pipe 14 that is provided inside the intake pipe and allows communication between the outdoors and the exhaust pipe 4. Reference numeral 15 denotes an exhaust temperature detector provided in the exhaust pipe 4 constituting the exhaust path. The controller 6 is a temperature detector 11
If the detected hot water temperature is different from the temperature set by an operating device (not shown), the gas proportional valve is controlled to stabilize the hot water temperature at the set temperature (hot water temperature control). When the exhaust gas temperature falls below the set temperature, the gas proportional valve 7 is controlled to increase the combustion amount so that the exhaust temperature does not fall below the set temperature (exhaust temperature control). In addition, the controller 6 gives priority to the latter exhaust temperature control, and the set temperature during exhaust temperature control is determined by the length of the intake/exhaust device 12 if the exhaust temperature detector 15 is not installed at the outdoor end of the exhaust path. It can be changed accordingly.

In the above configuration, the exhaust temperature control takes priority during initial startup, and the heat exchanger 2 is rapidly heated. After the exhaust gas temperature reaches the set temperature, hot water temperature control is performed. In general, the exhaust gas temperature may be lowered if the combustion amount is small and the flow rate is large, or if the intake/exhaust device is long. In proportional control type combustion devices, the exhaust temperature often decreases due to the former factor, but according to the present invention, even if the hot water temperature is being controlled, if the exhaust temperature decreases, the controller 6 will control the exhaust temperature. Since the switching takes place with priority, the exhaust gas temperature will not drop. In addition, for the latter factor, even if the exhaust temperature detector 15 is installed in the exhaust pipe 4 in the main body 1, its set temperature should be set to a temperature corresponding to the length of the intake and exhaust device 12. By doing so, it is possible to prevent the exhaust gas temperature from decreasing due to such factors.

In addition, when the combustion amount is varied by the exhaust temperature control and the outlet hot water temperature control in this way, the capacity of the fan 5 may also be varied according to the combustion amount. Furthermore, if the exhaust temperature does not rise due to some reason even if exhaust temperature control is performed, combustion can be stopped, and in this case, it is safe if the fan 5 is allowed to continue operating for a certain period of time.

As explained above, according to the present invention, it is possible to reliably prevent a drop in exhaust gas temperature, solve various problems caused by a drop in exhaust temperature, and provide a safe forced intake/exhaust type combustion device. This is possible.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram of the same example. 2... Heat exchanger, 3... Burner, 5... Fan, 6... Controller, 7... Proportional valve, 8... Fuel passage, 15... Exhaust temperature detector.

Claims (1)

[Scope of utility model registration request] A heat exchanger, a burner that heats the heat exchanger, a proportional valve installed in the fuel passage leading to the burner, a fan installed in the intake path or exhaust path, an exhaust temperature detector installed in the exhaust path, and the exhaust gas 1. A forced intake/exhaust type combustion device characterized by comprising a controller that controls a proportional valve with priority to control the exhaust temperature to a temperature higher than the set temperature when the temperature detected by the air temperature detector becomes lower than the set temperature.