JP2831098B2 - UV frame scanner module failure detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a failure of a module of an ultraviolet frame scanner applied to detection of a flame, light, or the like of a burner, a sterilizing device, an ultraviolet effect device, an ozone generator, and the like. It relates to a detection device.

[Conventional technology]

The radiant energy emitted from a flame such as a boiler burner includes ultraviolet light to infrared light, and the luminous energy showing the highest level in the flame is in the ultraviolet region.
Accordingly, detection of ultraviolet rays to confirm the presence of a flame is often performed in boiler control and the like.

A third flame scanner that checks for the presence of a conventional flame
Shown in the figure.

The conventional device shown in FIG.
4, a flame detection unit 11 comprising an output circuit 15 and a power supply circuit 16 for outputting a flame detection output signal 23, a flame detection check circuit 12 for outputting signals to the transmission circuit 13 and the output circuit 15 of the unit 11, and a burner 19. An ultraviolet ray detecting discharge tube 10 for detecting a flame 20 and inputting a flame detecting signal 21 to the transmitting circuit 13 of the unit 11, and a shutter excitation signal from the transmitting circuit 13 disposed on the front surface of the ultraviolet detecting discharge tube 10 The electromagnetic shutter 12 was opened and closed by a shutter driving coil 18 operated by 22.

In the above description, the failure of the device is checked by opening and closing the electromagnetic shutter 17. When the burner frame (flame) 20 is present, the shutter 17 is closed and the flame is not detected. When the flame scanner detected the flame, it was determined to be faulty.

[Problems to be solved by the invention]

The following problems have been encountered in failure detection by a conventional electromagnetic shutter.

(1) Since an electromagnetic shutter (coil) is used (excitation / non-excitation of the coil is repeated for the check), it is limited to check once per day from the viewpoint of life. (Approximately 5 to 7 years of life once a day) (2) Since the shutter was closed mechanically by coil excitation, it took a long time to check the operation. (Because one frame scanner takes about 20 seconds, it takes 4 to 13 minutes for all burner frames.) (3) Failure detection by electromagnetic sitter is only possible when there is a frame in the corresponding burner If it was not valid and there was no frame, failure detection could not be performed.

 The present invention seeks to solve the above problems.

[Means for solving the problem]

The ultraviolet frame scanner module failure detection device of the present invention is provided in an amplifier circuit of a conversion circuit of the ultraviolet frame scanner, is connected to a full-wave rectified power supply, cuts a bias voltage of an output of the power supply, and reduces a low voltage. An output signal is created, and the output signal is used as a simulation signal simulating the output signal of the flame detection discharge tube, and a switching relay circuit is provided which enables the simulation signal and the output signal of the flame detection discharge tube to be switched and input to the amplification circuit. It is characterized by that.

[Action]

In the above, during the normal operation of the ultraviolet frame scanner, the flame is checked by inputting the output signal of the flame detection discharge tube to the amplifier circuit of the conversion circuit.

When checking the module failure of the ultraviolet frame scanner, a simulation signal is input from the full-wave rectification power supply to the amplification circuit by a switching relay circuit provided in the amplification circuit in place of the output signal of the discharge tube, and the simulation signal Yes "
If the output of the scanner is "flame present", it is determined to be normal, if "flame is absent", it is determined to be abnormal.If the simulation signal is "no flame", the output of the scanner is "no flame". If normal, “flame present”, it is determined to be abnormal.

As described above, the failure inspection of the module can be performed by the electric operation, so that the inspection time can be shortened, the life of the device can be extended, and the failure inspection can be performed without the burner frame.

Embodiment An embodiment of the present invention will be described with reference to FIGS.

In this embodiment, a discharge tube for detecting ultraviolet rays is provided in a flame detecting unit 11 of the conventional ultraviolet frame scanner shown in FIG.
FIG. 1 shows a modification of a conversion circuit 14 built in together with a transmitting circuit 13 for inputting a flame detection signal 21 from FIG. 10, an output circuit 15 for outputting a flame detection output signal 23, and a power supply circuit 16, as shown in FIG.

In this embodiment shown in FIG. 1, an input gate 4a is connected to a positive side of a full-wave rectified power supply 6 via a diode 7, an operation signal input gate 4b is supplied with a + side output voltage of a transmitting circuit 13, and a cathode 4c is connected to the input side. In the conversion circuit 14 including the thyristor 4 which outputs an output signal and forms an amplification circuit, the conversion circuit 14 is provided in the circuit 8 to which the operation signal input gate 4b is connected, and when the contacts a ₁ and c ₁ are connected, + The switching relay 1 for inputting the side output voltage to the input gate 4b of the operation signal, the resistor 3 connected to the positive side of the full-wave rectified power supply 6, and the contacts a ₂ and c ₂ connected to the resistor 3 the same resistor 3 and a switch relay 2 to be connected to the contact b ₁ of the switching relay 1.

In the above, during the normal operation of the ultraviolet frame scanner, when the ultraviolet ray detection discharge tube 10 detects the flame 20 of the burner 19, the discharge tube 10 generates a discharge voltage, and the transmission circuit 13
2 (b) is output, which becomes an input of the operation signal input gate 4b of the thyristor 4, and the output voltage as shown in FIG. 2 (c) is applied to the cathode 4c of the thyristor 4. As a result, an output voltage proportional to the stability of the flame (the amount of ultraviolet rays in the flame) can be obtained.

Next, inspection for module failure of the ultraviolet frame scanner according to the present embodiment will be described.

First, regarding the operation confirmation of the state of “flame present”, the contacts b ₁ and c ₁ of the switching relay ₁ are connected, and the contacts a ₂ and c ₂ of the switching relay ₂ are connected and the full-wave rectified power supply 6 2. The simulation signal shown in FIG. 2D is input to the operation signal input gate 4b of the thyristor 4.

The simulation signal input from the full-wave rectified power supply 6 is obtained by cutting the bias voltage by the resistor 3 from the voltage output from the power supply 6, and is similar to the output signal of the transmission circuit shown in FIG. Therefore, it can be used as a simulation signal.

In the above state, the flame detection output signal 23 is output from the output circuit 15.
Is determined as normal, and otherwise is determined as abnormal.

Then, when performing the operation confirmation of the status of the "flame Mu", switch relay 1 is in a state where the same contact b _1, c ₁ is connected, the contacts b ₂ contacts C ₂ switches the switch relay 2 Connect to

In the above case, the operation signal input gate of the thyristor 4
Since the simulation signal is not input to 4b, if the flame detection output signal 23 is not output from the output circuit 15, it is determined that the signal is normal, and if it is output, it is abnormal.

As described above, the mechanical operation is eliminated, and the confirmation is made only by the electric operation. Therefore, the operation confirmation time per one frame scanner can be shortened (about 2 seconds by one frame scanner, and therefore, all the burner frames can be used). Even if you check it, it can be confirmed within about 1 minute), and a long life of 10 years or more can be secured.

Further, even when there is no frame in the burner, a signal can be simulated and the failure of the module can be detected.

This embodiment can be used in combination with the conventional failure detection by an electromagnetic shutter, and can greatly improve the reliability of the entire frame scanner device.

〔The invention's effect〕

A module failure detection device according to the present invention is a switching relay circuit that generates a simulation signal of an output signal of a flame detection discharge tube from an output voltage of a full-wave rectified power supply, and enables a switching input between the simulation signal and the output signal of the discharge tube. Is provided in the amplifier circuit of the conversion circuit, so that the module can be inspected for faults by electrical operation.
The life of the device can be extended, and failure inspection can be performed when there is no burner frame.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of signal waveforms in the above-described embodiment, and FIG. 3 is an explanatory diagram of a conventional device. 1,2 switching relay, 3 resistor, 4 thyristor, 4a input gate, 4b operating signal input gate, 4c cathode, 6 full-wave rectified power supply, 7 diode 8 ………………………………………………………………………………………………………………………………………………………………… Circuit, 16: Power circuit, 19: Burner, 20: Flame.

Claims (1)

(57) [Claims] 1. A low-voltage output signal which is provided in an amplifying circuit of a conversion circuit of an ultraviolet frame scanner, is connected to a full-wave rectifying power supply, cuts a bias voltage of an output of the power supply, and generates a low-voltage output signal. An ultraviolet type frame comprising: a simulation signal simulating an output signal of a flame detection discharge tube; and a switching relay circuit that can switch and input the simulation signal and the output signal of the flame detection discharge tube to the amplification circuit. Scanner module failure detector.