JPH0612328Y2 - Blow device erroneous operation detection device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention detects the presence or absence of erroneous operation of a blower by detecting a change in the water level in the boiler at the time of start-up, especially at the first start after blowing. It relates to the device.

[Conventional technology]

When evaporation continues for a long time in a boiler, impurities contained in the water in the boiler water in the boiler gradually concentrate due to a distillation action, which causes harmful effects such as forming, priming, and overheating of a heat transfer surface due to adhesion of scale.

In order to prevent such a harmful effect, the concentrated impurities are discharged by performing evaporation for a time suitable for the water quality and periodically performing all blows by a blower equipped in the boiler.

Further, at the time of manufacturing the boiler, after the boiler is assembled, a test operation is performed to confirm the performance, but after the test operation is completed, the blower discharges the can water to perform a can-canning process.

As described above, the boiler is provided with a blower device for discharging canned water for various purposes, but in the conventional boiler, the operation of the blower device and the combustion device of the boiler are considered from the purpose of use. The actuations are configured to operate separately and independently.

Therefore, when starting the boiler, due to an unexpected situation (for example, blower failure or human error),
If the boiler starts operating while the blower is still operating, the water supply capacity of the water supply pump will exceed the discharge from the blower, and the water level in the boiler will exceed the specified water level (the water level detection position of the upper water level detector). ), The combustion operation is started, and then the blow amount balances with the water supply amount by the pressurization or becomes larger than the water supply amount, and the combustion operation is performed without sufficiently increasing the pressure, and the space portion that does not have can water is There was a danger of overheating the can body part.

[Problems to be solved by the device]

The present invention has been made in view of the above problems, and detects an erroneous operation of a blower device by detecting a change in the water level in the boiler at the time of starting the boiler, and prevents the occurrence of an empty heating phenomenon at the time of starting the boiler. An object is to provide an erroneous operation detection device for a blower device.

[Means for Solving the Problems]

The present invention has been made to solve the above-mentioned problems, and is provided with a blowing device, an upper limit water level detector for detecting an upper limit water level and a lower limit water level detector for detecting a lower limit water level, and the water level is at the upper limit water level. In a boiler that sometimes starts combustion, when the first water level detection signal is received from the upper limit water level detector at the time of starting the boiler, the integration of the water level decrease time in the boiler is started, and the decrease time is set time. When a water level undetectable signal is received from the lower limit water level detector before reaching, the function determines that the blower device is abnormal and outputs a malfunction signal of the blower device, and also sets the drop time. When there is no water level undetectable signal from the lower water level detector before the time is reached,
It is characterized in that a discriminator having a function of resetting the integration of the lowering time when the blower is judged to be normal is provided.

〔Example〕

Hereinafter, a specific embodiment of the present invention will be described in detail with reference to the drawings. The drawing is an illustration of an embodiment of the present invention.

In the drawing, the boiler 3 includes a blower 5, a water supply pump 6, and a combustion device 7. Further, the boiler 3 is provided with a water level gauge box 8 communicating with the inside of the boiler 3 and configured to display the water level of the canned water in the boiler 3. In this water level gauge box 8, an upper limit water level detector 1 for detecting an upper limit water level A and a lower limit water level detector 2 for detecting a lower limit water level B during normal operation of the boiler 3 are inserted, and each detector 1, 2 outputs a water level detection signal to the discriminator 4, respectively.

The water supply pump 6 is configured to operate on / off in response to a signal from the discriminator 4, and the combustion device 7 enters an operation standby state in response to an operation signal from the discriminator 4. It is configured to be turned on / off by a signal from a load detection means (not shown).

Now, if there is a start signal from a boiler starting device (not shown), the discriminator 4 turns on and off the water supply pump 6 by the detection signals from the upper and lower limit water level detectors 1 and 2, and the inside of the boiler 3 is operated. While maintaining the water level between the upper water level A and the lower water level B, and after receiving the start signal from the boiler starting device,
When the first water level detection signal S is received from the upper limit water level detector 1, an operation signal is output to the combustion device 7, and when the first water level detection signal S is received, integration of the water level lowering time T is started. . Further, when there is a water level detection impossible signal from the lower limit water level detector 2 within the set time T ₀ , it is configured to output an erroneous operation signal of the blower 5. Further, until the water level lowering time T reaches the set time T ₀ , if there is no water level undetectable signal from the lower limit water level detector 2, the blower device 5 determines that it is normal and resets the integration of the water level lowering time T. Has been done.

Here, the set time T ₀ is a time determined by the structure peculiar to the boiler 3, and when the blower device 5 is operated when the pressure inside the boiler 3 is _zero , the water level in the boiler 3 is higher than the upper limit water level A. It is determined in consideration of the time required to decrease to the lower limit water level B and the time required for the combustion device 7 to operate to heat the boiler water in the boiler 3 and start evaporation.

Next, the operation of the above configuration will be described.

When the boiler water is concentrated due to the long-time operation of the boiler 3,
The combustion device 7 and the water supply pump 6 are stopped by a signal from a boiler starting device (not shown), the blower device 5 is opened, and the can water is discharged. When the blowing is completed, the blowing device 5 is closed,
A start signal is input by the boiler starter.

The discriminator 4 that receives the activation signal outputs an operation signal to the water supply pump 6 until the water level detection signal is received from the upper limit water level detector 1, and causes the water supply pump 6 to perform the water supply operation. When there is the water level detection signal S, the water feed pump 6 is stopped and an operation signal is output to the combustion device 7 to put the combustion device 7 into an operation standby state. The combustion device 7 in the operation standby state starts combustion if there is a load signal from the load detection means (not shown) (normally immediately after blow,
Since the inside of the boiler 3 is in a non-pressurized state, a load signal is output from the load detection means, and the combustion shifts to combustion at the same time when the feed water pump 6 is stopped. ). As a result, the boiler water in the boiler 3 is heated, and evaporation starts gradually. Then, when the water level in the boiler 3 decreases and becomes lower than or equal to the lower limit water level B, the discriminator 4 receives the water level detection inability signal from the lower limit water level detector 2 and the water supply pump 6
To start water supply again. In the following, the water level in the boiler 3 is maintained between the upper limit water level A and the lower limit water level B and steam is generated as described above.

Here, when the boiler 3 is started, for example, the first start after the blow, the discriminator 4 receives the start signal from the boiler starter and then receives the first water level detection signal S from the upper limit water level detector 1 to lower the water level. If there is a water level undetectable signal from the lower limit water level detector 2 before the water level lowering time T reaches the set time T ₀ after the integration of the time T is started, it is judged that the blower 5 is abnormal and the blower 5 Output an erroneous operation signal.
Further, until the water level lowering time T reaches the set time T ₀ , if there is no water level detection inability signal from the lower limit water level detector 2, the blower device 5 determines that it is normal and resets the integration of the water level lowering time T. That is, when the blower 5 is in a blown state due to an erroneous operation, the water level in the boiler 3 reaches the upper limit water level A, which is the detection position of the upper limit water level detector 1, and the combustion device 7 operates at the first start after the blower. However, the water level is detected by the lower limit water level detector 2 before the inside of the boiler 3 is pressurized by evaporation.
Since the water level is lowered to the lower limit water level B which is the detection position of, the lower limit water level detector 2 outputs a water level detection impossible signal to the discriminator 4.
The discriminator 4 that detects this output signal outputs an erroneous operation signal of the blower 5 (preferably, by using the erroneous operation signal to stop the combustion device 7), the erroneous operation of the blower 5 is repaired. Therefore, an appropriate signal is issued to take appropriate measures for the combustion device 7 to prevent the boiler 3 from overheating.

Further, if the blower device 5 is normal and the blower is stopped, even if the water level in the boiler 3 reaches the upper limit water level A and the combustion device 7 operates at the first startup after the blower operation, the water level remains the lower limit water level B. Since the steam holding portion is sufficiently filled with the generated steam by the time the temperature drops to 0, there is no danger that the can body is overheated.

[Effect of device]

As described above, according to the present invention, at the time of start-up, especially at the first start-up after blowing, the judgment is made by detecting the actual drop in the water level before the pressure inside the boiler is increased.
It is possible to reliably detect an erroneous operation of the blow device. Moreover, since a water level detector for water level control that is usually used in boilers can be used as a water level detection method, it is possible to provide an erroneous operation detection device for a blowing device that is simple in structure, inexpensive, and reliable. .

[Brief description of drawings]

 The drawing is an illustration of an embodiment of the present invention. 1 …… Upper limit water level detector 2 …… Lower limit water level detector 3 …… Boiler 4 …… Discriminator 5 …… Blowing device 6 …… Water supply pump 7 …… Combustion device 8 …… Water level gauge box A …… Upper limit water level B ...... Lower water level

Claims (1)

[Scope of utility model registration request] 1. A blower 5 is provided, and an upper limit water level detector 1 for detecting an upper limit water level A and a lower limit water level detector 2 for detecting a lower limit water level B are provided, and combustion is started when the water level is at the upper limit water level A. In the boiler 3, when the first water level detection signal S is received from the upper limit water level detector 1 at the time of starting the boiler 3, integration of the water level decrease time T in the boiler 3 is started, and the decrease time T is When it receives a water level undetectable signal from the lower limit water level detector 2 before reaching the set time T ₀ , it has a function of judging that the blower device 5 is abnormal and outputting an erroneous operation signal of the blower device 5. At the same time, when there is no water level undetectable signal from the lower limit water level detector 2 until the decrease time T reaches the set time T ₀ , it is judged that the blower device 5 is normal, and the integration of the decrease time T is performed. Re Operation error detection device of the blow device characterized by providing the classifier 4 having the function of Tsu and.