JPS59114613A - Water surface control device by one electrode - Google Patents

Abstract

PURPOSE:To simplify a sturcutre, to execute easily a maintenance, and to make a titled device inexpensive by combining and using one water surface detecting rod inserted into a water surface control box and a specified timer relay. CONSTITUTION:In a water surface control device for a boiler, one water surface detecting rod 2 is inserted into the inside of a water surface control box 1, and its water surface 4 is detected through an AC power source 3 and a water surface detecting relay X. A water supply pump timer T1 is a time limit operation and time limit reset type, drives a water supply pump switch WP by turning on and off after a time t11 passes and after t12 passes, and controls a water supply. Also, a burner motor timer T2 is a time limit operation instantaneous reset type, drives a burner motor switch BM by turning on after a time t2 and turning off instantaneously, and controls burning. When a boiler is started, water is supplied but burning is not executed, and when the water surface 4 rises and a relay X operates, burning of a burner is started immediately, and after a time t12, the water supply is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water level control device for a boiler, and more specifically, to a device for controlling the water level of a tank such as a boiler using a single water level detection rod.

Generally, when managing water supply in a boiler or the like, it is necessary to frequently operate or stop a water supply device attached to the boiler.

In the past, various methods have been proposed and adopted to solve this need. For example, typical water level detection methods include a flow set and an electrical conduction detection method.
Especially for small boilers, the electrical conduction detection type is the mainstream.

Regarding the electrical conduction detection method, specifically, the water surface detection electrode
Combinations such as detection electrical circuit-water pump are common. However, when this method is used, a water surface detection rod is required to activate the water pump, a water surface detection rod is used to stop the water pump, and at least two detection rods (one for activating the water pump, one for stopping the water pump, and at least two detection rods for the burner to burn in relation to fluctuations in the water level). However, the structure of the water surface control box containing these water surface detection rods becomes extremely complicated, making it difficult to manufacture and install such a water surface control device. is extremely uneconomical, and in addition, maintenance of the device after installation is also extremely complicated.

Furthermore, a liquid level control method using radiation is also known.
For example, this method is explained in detail in Japanese Utility Model Publication No. 36-2222. This method is revolutionary in that it omits the conventional detection rod and uses a radiation detector instead, but the essential point is how to combine this method with burner combustion. Thoughts are not disclosed. Furthermore, since this method uses radiation, it is uneconomical in terms of manufacturing cost and maintenance cost (including the cost of managing radioactive isotopes). In addition, this method has the disadvantage that the liquid supply does not occur in the desired manner. That is, in this system, once the water level detector is turned on, the water supply timer operates regardless of the ON-OFF switching, and therefore, the water supply operation always stops after a set time. for example,
Referring to Figure 2 of Utility Model Publication No. 36-2222 cited earlier, the liquid level in a tank varies depending on the amount of liquid flowing out from the tank, but the supply of liquid (replenishment) depends on the level of the liquid level. It can be seen that the process is simply performed for the set time T, regardless of the time.

The object of the present invention is to provide an improved water level control device for a boiler that eliminates the various drawbacks mentioned above. That is, the purpose of the present invention is to enable appropriate control of the boiler water level and appropriate combustion of the burner by using only one water level detection rod, and thereby enable the control of the water level control box. The purpose is to simplify the structure, make it easier to maintain, and lower the cost of the device.

The water level control device for a boiler according to the present invention has the following means: 1 water level control box to be placed in a water level control area in the boiler; 1 box inserted into the water level control box 1 while being insulated from the box; a water surface detection rod 2, a power source 3 connected to the water surface control box 1 and the non-water surface detection end of the water surface detection rod 2 for applying an alternating current voltage therebetween;
, installed in the middle of the wiring connecting the water surface detection rod 2 and the power source 3, operates when the water level of the boiler reaches the set bell 4, and returns when the water level falls below the set level 4. Water surface detection relay that operates x 1 is connected to the relay X, is energized (operated) with the operation of relay ),
Therefore, 1 relay that releases the self-circuit is connected to relay X, is energized as relay A water pump timer T1 of the time-limited instant return type or the time-limited action and time-return type that returns after the set time t12 has elapsed, is connected to relay X, is energized when relay X returns, and operates after the set time t2 has elapsed. , A timer for a burner motor with a time-limited operation and instant return type that becomes de-energized and instantaneously returns when relay Water supply circuit A that releases the water supply circuit by
A water supply circuit is formed by the operation of the timer T1, and the water supply circuit is canceled by the return of the timer T1.The water supply circuit B1 connected in parallel with the water supply circuit A is formed by the return of the timer T2 and the operation of relay x1. and timer T
The burner combustion circuit A1 is characterized in that it includes a burner combustion circuit A1 which releases the combustion circuit by the activation of relay x1 or the return of relay x1.

That is, the boiler water level control device according to the present invention has the following features:
When the boiler is started, water is supplied by the water supply pump, and when the water level of the boiler reaches the set level 4, the water level detection relay X switches its contacts and becomes activated,
The relay x1 is energized to form a self-holding circuit, the timer T1 is de-energized and the water supply is stopped immediately or after the set time t12, and on the other hand, the timer T2 is also de-energized and the burner immediately stops burning. If the water level in the boiler falls below the set level 4 again, the relay and, on the other hand, the water level in the boiler does not return to the set level 4 or higher by the time t2 set by timer T2, and therefore,
The burner is configured to stop combustion when the relay X is not energized.

In the water level control device for a boiler according to the present invention, a timer T1 for the water supply pump and a timer T1 for the burner motor.
2 operates only when the water surface detection relay X is restored and the relay X is de-energized. Therefore, when the water level detection relay - T2 starts operating again.

The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory circuit diagram of an embodiment in which the water pump timer T1 is of a time-limited operation and time-limited return type. 1 in the diagram
is the water surface control box. As shown in the figure, one water surface detection rod 2 is inserted into the water surface control box while being insulated from the box. Furthermore, an AC power source 3 for water surface detection and a water surface detection relay X are connected to the water surface control box 1, and the AC power source 3 is
It also has the function of preventing polarization of the water surface detection section.

T1 is a so-called time-limited operation time-limited return type water pump timer, and when it is energized, it closes its contacts after a certain amount of time t11 has elapsed, and when it is de-energized it also closes its contacts after a certain amount of time t12 has elapsed. It has an opening mechanism.

T2 is a burner motor timer of the so-called time-limited instantaneous return type, and has a mechanism that opens its contacts after a certain amount of time ℃ 2 has passed when it is energized, and instantly closes its contacts when it is de-energized. ing.

Relay x 1 is a relay for forming an initial circuit when starting the boiler, and is energized when relay As a result, it becomes de-energized, releases the self-holding circuit, and forms an initial circuit when starting the boiler.

WP is a water supply pump switch, which forms a water supply circuit by returning relays X and x1, releases the water supply circuit by operating relays X or xl, and forms a water supply circuit by operating water supply circuit A and timer T1 However, it is connected to the water supply circuit B, which is connected in parallel to the water supply circuit A, which releases the water supply circuit when the timer T1 returns.

BM is a burner motor switch, and timer T2
A combustion circuit is formed by the return of and the operation of relay x1,
It is connected to a burner combustion circuit which releases the combustion circuit by activation of timer T2 or return of relay x1.

The device of this invention is composed of the above-mentioned means, and first, when starting the boiler (that is, during a drought), as shown in the figure, the water supply circuit A is activated by the return of relay x-x1 at the same time as starting the boiler. Water supply begins. On the other hand, relay ×
Since No. 1 is de-energized, the combustion circuit A by timer T2 and relay x1 is deactivated, and no burner combustion is performed.

On the other hand, the timers T1 and T2 are energized because the relay The burner combustion circuit continues, and both relay x1 and timer T2 are released, and no combustion occurs.

By the way, when the water level in the boiler gradually rises and reaches the tip of the water surface detection rod 2 (set level 4), the water surface detection relay X is activated. Therefore, relay X1 is energized, a self-holding circuit of relay x1 is formed, and the contacts of relay X1 of water supply circuit A are opened. From then on, until the self-holding circuit of relay ) Water supply circuit A is released. On the other hand, the timer 1-2 is de-energized by the operation of the relay X, and the contact point of the timer T2 is instantaneously restored, the combustion circuit A is also formed, and combustion in the burner (not shown) is immediately started. In addition, due to the operation of relay
water supply (which has already been lifted) will be suspended.

Then, when the water level that has risen once again becomes below the tip of the water surface detection rod 2 (below the set level 4), the water surface detection relay X returns again. Then, timers T1 and T2 are excited. The timer-1 contact closes after the set time 11 has elapsed, forming water supply circuit B, and water supply starts again.Meanwhile,
If the water level does not reach the set water level 4 by the elapse of the set time t2, the contacts of the timer T2 open to release the burner combustion circuit and stop the burner combustion. However, if the water level reaches the set water level 4 again before the set time t2 of timer T2 elapses, relay continue. On the other hand, due to the operation of relay X, timer T1 is de-energized and the set time t12
Then stop the water supply.

By repeating the above steps, boiler water supply control and burner combustion control are performed.

Finally, when the boiler operation is stopped, the timers T1 and T2
is reset and the self-holding circuit of relay x1 is also released,
The circuit returns to the one shown in the figure.

FIG. 2 is an explanatory circuit diagram of an embodiment in which the water pump timer 1-1 is of a time-limited operation instantaneous return type. In this case, when the water level in the boiler reaches set level 4, the water level detection relay X switches its contacts and becomes activated, and the water supply pump timer 71 is de-energized and the water supply is instantly stopped.

In other words, when the water level in the boiler reaches the set water level 4, the water supply stops instantly, so the highest water level in the boiler remains constant and high-quality steam can always be obtained without being affected by changes in the capacity of the water supply pump due to changes in pressure inside the boiler. can. Note that the other parts are the same as those in FIG. 1, so the explanation will be omitted.

In connection with this invention, when controlling water supply to a boiler,
It is generally necessary to control the amount of water supplied and to shut down the burner to prevent overheating of the boiler if the water level drops below a specified water level. To achieve this, conventionally, the water supply control level and the burner stop level were set at different positions to prevent mutual interference.

By the way, according to the present invention, the water supply control level and the burner stop level are set at the same level and a time element is added (the timer for the water supply pump is set to a time-limited operation time-limited return type or a time-limited operation instantaneous return type, and the burner motor timer is set to a time-limited timed return type). Mutual interference can be prevented only by using an instantaneous return type.

As mentioned above, the device according to the present invention can control the water supply pump (ON-OFF control) using a single water surface detection rod inserted into the water surface control box, so it is possible to achieve water pump control (ON-OFF control) using the water surface control box. The number of water surface detection rods can be reduced to one (compared to other devices), and its maintenance can be made easier.In addition, the entire water surface control box can be made more compact, and the price can be lowered. You can also measure the location.

[Brief explanation of the drawing]

FIG. 1 is an explanatory circuit diagram of an embodiment in which the water pump timer T1 of the present invention is a time-limited operation time-limited return type, and FIG. 2 is a circuit diagram for explaining an embodiment of the water supply pump timer T1 of the present invention.
FIG. 2 is an explanatory circuit diagram of an embodiment when the circuit is of a time-limited operation instantaneous return type. In the figure, 1 is the water surface control box, 2 is the water surface detection rod, 3 is the AC power supply, 4 is the water level setting level, X is the water surface detection relay, T1 is the water pump timer, T2 is the burner motor timer, t is the water supply Start time, t 12
is the water supply stop time, t2 is the burner stop time, WP is the water supply pump switch, and BM is the burner motor switch. Patent applicant Miura Kogyo Co., Ltd. Representative Miura
Figure 1

Claims (1)

[Claims] 1. The following means: A water level control box 1 to be placed in a water level control area in the boiler, a water level control box 1 inserted into the water level control box 1 in a state insulated from the box. a water surface detection rod 2; a power source 3 connected to the water surface control box 1 and a non-water surface detection end of the water surface detection rod 2 for applying an alternating voltage therebetween; the water surface detection rod 2 and the power source 3; Water surface detection relay It is connected to the relay X, is energized (activated) as the relay
Therefore, a relay that releases its own circuit ×! , is connected to relay A water pump timer T1, which is a time-limited operation and time-limited return type that returns after 2 elapses, is connected to relay X, is energized when relay Timer T2 for the burner motor, which is energized and instantaneously returns, is a time-limited operation and instant return type; water supply circuit A, which forms a water supply circuit by the return of relays X and xl, and releases the water supply circuit by the activation of relays X or x1;
A water supply circuit B is connected in parallel with the water supply circuit A, which forms a water supply circuit by the operation of the timer Tt, and releases the water supply circuit by the return of the timer T1, and a combustion circuit by the return of the timer T2 and the operation of relay x1. Form and timer T
A water level control device for a boiler, characterized in that it includes a burner combustion circuit A1 which releases the combustion circuit by activation of relay 2 or return of relay 1. 2. Timer T1 for the water supply pump connected to relay X is energized when relay The water level control device for a boiler according to claim 1, characterized in that it is of a return type.