JPS6226455A - Hot air type heater - Google Patents

Abstract

PURPOSE:To facilitate maintenance and inspection by storing a time, whereat a safety mechanism is operated, with a memory means and indicating the time with an indicating means as required. CONSTITUTION:When it is identified in step 101 that the safety mechanism is opertaed, the operation of the heater is stopped in step 102, the number, name or the like of the operated safety mechanism is stored and the number, name or place thereof is indicated in step 103. The time, whereat the safety mechanism is operated, is stored in step 104.The time, whereat the safety mechanism is operated, is indicated in step 106 by inputting the requesting signal of the time, whereat the safety mechanism is operated into a micro-computer at the time of the maintenance and/or inspection of the warm-air heater in step 105. Thus, time elapsed after the operation of the safety mechanism and operation time may be estimated easily and the maintenance and/or inspection of the warm-air heater may be facilitated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention of B relates to a hot air heater whose operation is controlled by a microcomputer.

[Conventional technology]

Typically, hot air heaters have a flame detection mechanism that monitors the combustion state, an anti-seismic automatic fire extinguishing system that extinguishes fires due to earthquakes, etc., a fire extinguishing system that extinguishes the fire before abnormal combustion occurs when fuel is low, and equipment failure. It has a built-in safety mechanism such as a device self-diagnosis function that detects abnormalities including fire and extinguishes the fire.

Furthermore, in recent years, microcomputers have been used to control hot-air heaters, and these microcomputers have been equipped with timekeeping means and storage means for counting the time of a clock, and have been used to digitally display time and temperature.

On the other hand, when performing maintenance and inspection of a hot air heater, if the location, time, and cause of the activation of the safety mechanism are known, the hot air heater can be easily repaired. In particular, people tend to neglect the time, but if you know the time since the safety mechanism activated, you can estimate the time the safety mechanism activated and the driving time, and understand the situation when the safety mechanism activated. It becomes more clear.

FIG. 2 is a control block diagram of a Mitsubishi Electric kerosene fan heater model KD-27GTB, which is an example of a conventional warm air heater.

Reference numeral 11 denotes a microcomputer, which is supplied with power from the power supply circuit 2. 3 is an oscillation element, and microcomputer 1
It oscillates together with the internal circuit of the microcomputer 1 to generate a clock signal for the microcomputer 1.

(No. i A is a signal from the humidity sensor, signal B is a signal indicating that water has mixed into the fuel, No. 4 m C is a signal indicating that the fuel has decreased, and signal No. 1 is a signal indicating that combustion for heating continues. Flame detection sensor No. 48, 4 indicates that the flame has disappeared.
No. a E is a switch signal for setting the heating temperature and setting the time during timer operation.

These signals are converted into microcomputer input signals by the receiver circuit 4 and input to the microcomputer 1.

The microcomputer 1 connects the relay wAI as necessary.
No. 4a is output to the jllJ circuit 5, the relay 6 is opened and closed, and the heater of the load 7, the electromagnetic pump for discharging liquid fuel, the fuel on/off valve, the motor for discharging hot air, etc. are operated, and the display signal is output. Display drive port! s8 and display the time and temperature on the display.

Here, if the combustion is extinguished in the middle, there are many possible causes, such as insufficient pumping amount of the electromagnetic pump, a malfunctioning signal of the flame detection sensor signal, and a malfunction of a combustor such as a burner.

Also, the burning time until extinguishing will vary depending on the cause. For example, in the case of a malfunction signal of the flame detection sensor signal, the combustion time is about 20 seconds, and the insufficient pumping amount of the electromagnetic pump is about 5 to 10 minutes.In the case of a malfunction of the combustor such as a combustor, the combustion time is about 30 minutes. There are many cases.

Therefore, if the combustion time before extinguishing is known, it is effective in finding the cause of extinguishment in the middle of the fire.

In addition, if the automatic seismic fire extinguishing system activates and extinguishes a fire, knowing the time at which the fire was extinguished can help determine whether the automatic seismic fire extinguishing system operated normally and extinguished the fire, or whether it was a malfunction of the automatic seismic fire extinguishing system. It is valid.

Furthermore, if the hot air heater malfunctions and is left in that condition for a long time or moved, the malfunction may not occur again. For example, if the filter that filters liquid fuel becomes dirty and the liquid fuel does not permeate through the fire, and the fire is extinguished before fuel can be supplied in time, if you leave the fire unattended for a long time, the fuel will gradually filter through the filter. It will pass through and you will be able to use the hot air warmer again for a while.

Therefore, determining the elapsed time since the safety mechanism was activated is effective in finding the cause of equipment failure.

Figure 3 shows Mitsubishi Electric oil fan heater K shown in Figure 2.
In the control flowchart of the D-27GTS type, step 1
If the safety mechanism operates at step 11, the operation is stopped at step 11, and the number or name of the operated safety mechanism is memorized at step 12.
Alternatively, the display may be performed by position or the like.

[Problem that the invention seeks to solve]

Conventional hot air heaters are configured as described above.
Although it has a timing mechanism, the timing mechanism is ineffective unless the time is set, and the time when the safety mechanism was activated, the combustion time, and the elapsed time since the safety mechanism was activated are completely unknown, making it impossible to determine the cause of the failure. This is difficult and requires a lot of time and effort in maintenance and inspection.

In particular, the control circuits of hot-air heaters have become increasingly complex in recent years, making it extremely difficult to determine whether the device is malfunctioning or there is a problem with how it is being used when a safety mechanism activates and extinguishes the fire.

The invention of B was made in order to solve the above-mentioned problems, and its purpose is to obtain a hot air heater that can be more easily maintained and inspected.

[Means for solving problems]

The hot air DI device according to the present invention has a safety mechanism for stopping operation in the event of an abnormality, a display means, a clock means for counting time, and a storage means, and the storage means stores the time when the safety mechanism operates. This time can be stored on a display device as needed.

[Effect]

In this invention, the storage means stores the time when the safety mechanism was activated, and displays this time on the display means by key operation or by short-circuiting a check terminal provided on the control board as necessary. You can know the time when the safety mechanism was activated.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a control flowchart programmed into a microcomputer according to an embodiment of the present invention.

That is, in this embodiment, when it is determined in step 101 that the safety mechanism has operated, the operation is stopped in step 102, and the number or name of the operated safety mechanism is memorized in step 103, and the number or name or the Display the hotspot.

Further, in step 104, the time when the safety mechanism was activated is stored.

The time stored in step 104 is determined by inputting a request signal indicating the time when the safety mechanism was activated to the microcomputer 1 in step 105 during maintenance or inspection of the hot air heater, and the safety mechanism is activated in step 106. The time when the

In this way, you can know the time when the safety mechanism was activated, so
The time elapsed since the safety mechanism was activated and the time of operation can be easily estimated, and the hot air heater can be easily maintained and inspected.

〔Effect of the invention〕

As described above, according to the present invention, the time at which the safety mechanism was activated is stored in the storage means, and the time can be displayed on the display means as needed. This has the effect of allowing you to know the elapsed time, etc., and to easily perform maintenance and inspection of the hot air heater.

[Brief explanation of the drawing]

FIG. 1 is a control flowchart showing an embodiment of the invention of B, FIG. 1 is a control block diagram of a conventional hot air heater, and FIG. 3 is a control flowchart of a conventional hot air heater. In the figure, 1 is a microcomputer and S is a display. Agent: Masuo Oiwa (2 others) Figure 1 - Figure 3 Procedure amendment group (method)

Claims (1)

[Claims] It has a safety mechanism that stops operation in the event of an abnormality, a display means, a timer means that counts time, and a memory means, and the time at which the safety mechanism operates is stored in the memory means, and the safety mechanism is activated as necessary. A hot air heater characterized in that the time at which the mechanism operates can be displayed on a display means.