JPH03244927A - Initial feeding method for circulating water in hot water heating device - Google Patents

Abstract

PURPOSE:To confirm that a radiator is in an operating condition and provide an easy and positive discrimination of a completion of initial feeding of heating circulation water by a method wherein an increased or decreased state of a water level in a cistern is monitored by a water level sensor, a water level in the cistern is kept at a high level and the high level continues to keep for a predetermined period of time (T). CONSTITUTION:A feeding pump 25 is operated to feed a heating circulating water in a cistern 9, resulting in that a water level sensor shows a high level H. When an operation of a circulating pump 10 is started while keeping an operation of the feeding pump 25, the heating circulation water in the cistern 9 is fed out to a heating circulation water circuit. The heating circulation water circuit is still filled with air, a water level of the heating circulation water in the cistern 9 is decreased to become a low level water level L. When the circulating pump 10 is stopped while continuing an operation of the feeding pump 25, the heating circulation water level in the cistern 9 is increased to become a high level water level H. After completion of initial feeding of the heating circulation water, an operation of the circulating pump 10 is started again and even after elapsing of a predetermined time T, a water level sensing signal is not decreased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for injecting initial circulating water into a closed system heating circulating water circuit provided in a hot water heating device, and particularly relates to a method for injecting initial circulating water into a closed heating circulating water circuit provided in a hot water heating device. The present invention relates to an improved initial injection method for circulating heating water so that it can be accurately determined that water injection has been completed.

[Conventional technology]

FIG. 3 is an explanatory diagram schematically depicting the piping of a hot water heating device equipped with a closed heating circulating water circuit.

Fuel gas is the original solenoid valve 1. Solenoid valve 2. It is supplied to the burner 4 via the proportional valve 3.

On the other hand, combustion air is sucked into the exhaust fan 5 and
It flows into the burner 4 and is burned.

The high-temperature combustion generated gas flows around the heat exchanger 7, is taken in by the exhaust fan 5, is discharged, and is discharged into the atmosphere from the exhaust port 8.

The heating circulating water is drawn into the circulation pump 10 from the cistern 9, sent out, and circulated through the heat exchanger 7.

The heating circulating water, which is heated and heated while flowing through the heat exchanger 7, is supplied to the radiator 14 through the outgoing pipe 12, and performs a heating function.

The heating circulating water that has passed through the radiator 14 returns to the cistern 9 via the return pipe 16.

A cross-sectional view schematically depicting the vicinity of the cistern is shown in FIG.

Reference numeral 18 denotes an expansion valve, which is provided to release expansion due to temperature rise of heating circulating water when the hot water heating system is operated. A portion of the heating circulating water that has expanded due to the temperature rise is transferred to the expansion valve 18.
is pushed open and flows out, and is stored in the reserve tank 19. 20 is a train port. When the heating circulating water in the closed circuit contracts due to a fall in temperature, the heating circulating water in the reserve tank 19 is sucked back from the expansion valve 18.

21 is a water level sensor that detects the water level within the cistern 9.

Reference numeral 22 shown in FIG. 3 is a control unit, which receives signal outputs from a water level sensor and other various sensors (not shown) provided in the hot water heating device, and is a remote controller attached to the radiator 14. 23 gives instructions for heating operation, and the original solenoid valve 1. Solenoid valve 2. Proportional valve 3. Automatically control other electrical equipment.

When a hot water heating device configured as described above is newly installed, or when heating circulating water is extracted after extensive maintenance or repair, initial injection of heating circulating water is performed.

The above-mentioned initial injection is performed by receiving an operation signal from the remote controller 23 that operates the radiator 14, opening a solenoid valve (not shown) provided in the radiator 14, and discharging the heating circulating water from the container 29 for transporting the heating circulating water. The heating circulation water is force-fed into the cistern 9 by the injection pump 25 through the initial injection pipe 17, and the circulation pump 10 is operated.

The air in the closed heating circulating water circuit is replaced with the injected heating circulating water, and together with a portion of the heating circulating water, it is pushed out from the expansion valve 18 and discharged into the atmosphere from the drain port 20.

After the air in the heating circulating water circuit is discharged and it is filled with heating circulating water, when further heating circulating water is injected into the cistern 9, the remaining heating circulating water passes through the expansion valve 18 and the reserve tank 19 to the drain port 20. overflow from.

When the worker who was performing the initial injection of heating circulating water using the injection pump 25 visually confirmed that the heating circulating water overflowed from the drain port, he judged that the initial injection was complete and proceeded into the cistern 9. Stop injection of circulating heating water.

[Problem to be solved by the invention]

When heating circulating water is injected into a closed system heating circulating water circuit using the above-mentioned conventional technique, since the heating circulating water circuit has a considerable length and is bent, there is a gap between the initial injection pipe 17 and the cistern 9. Even if heating circulating water is injected into the heating circulating water circuit, the heating circulating water does not immediately reach the end of the heating circulating water circuit.

In this way, even when air remains in a part of the heating circulating water circuit, the initial injection pipe 17 can be removed from the cistern 9.
When the heating circulating water injected into the cistern 9 is filled with the cistern 9 and continues to be injected, the heating circulating water pushes open the expansion valve 18, flows into the reserve tank 19, and overflows from the drain port 20.

Furthermore, when the radiator 14, which is an indoor unit, stops operating, the solenoid valve (not shown) provided in the radiator 14 is closed, so that the heating circulation water is not in the heating circulation water circuit. Water does not fill up. In other words, the heating circulating water overflows from the drain port with the heating circulating water entering only the portion closer to the heat source device than the solenoid valve in the radiator.

Generally, a radiator is equipped with a temperature sensor, and automatically operates when the temperature falls below a set temperature (for example, 20 degrees Celsius).
When the temperature exceeds the set temperature, the operation is automatically stopped.

Therefore, when the temperature is high, the radiator is stopped and must be operated manually. If this manual operation is forgotten, the heating circulating water will overflow from the drain port 20 even if the heating circulating water circuit is not full of water.

In such a case, if the heating circulation water injection is stopped because the initial injection is mistakenly assumed to have been completed by visual inspection of the overflow, air remains in the heating circulation water circuit.

If a hot water heating system is operated with air remaining in the heating circulating water circuit, not only will heating performance deteriorate, but also noise and vibration will be generated. When heating piping resonates, the noise and vibrations mentioned above are amplified, making quiet operation impossible.

Furthermore, if air bubbles are sucked into the circulation pump, cavitation may occur, which may cause wear and tear on the circulation pump.

Additionally, if air remains in the heating circulating water circuit, the remaining air will be replaced by the heating circulating water while the heating system is operating, lowering the water level in the cistern and making it impossible to operate. cause trouble.

Therefore, during the initial circulating water injection operation, it is important to determine whether the injection is complete.

Conventionally, an initial injection worker visually observes the state in which the heating circulating water overflows from the drain port 20, and estimates the state in the heating circulating water circuit based on this.

However, since the inside of the heating circulating water circuit cannot be directly observed, a high level of knowledge and skill is required to estimate the internal state.

If you make a mistake and end the injection operation prematurely, air bubbles will remain in the heating circulating water circuit, causing trouble.

Furthermore, if the radiator, which is an indoor unit, automatically stops operating due to the temperature, if this is overlooked and the initial injection of heating circulating water is completed, a similar problem will occur.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to accurately and easily determine the completion of the initial injection of heating circulating water (completion of exhaustion of air in the circuit) without requiring particularly advanced knowledge or skill. In particular, it is an object of the present invention to provide an initial injection method of heating circulating water without the risk of overlooking that an indoor unit is stopped.

[Means to solve the problem]

In order to achieve the above object, the method of the present invention detects an operation signal of a radiator, which is an indoor unit, when initially injecting circulating water into a hot water heating device equipped with a closed heating circulating water circuit, and .

A water level sensor is provided to detect the water level in the cistern, and a high level water level when a necessary amount of heating circulating water is stored in the cistern and a lower low level water level are set. Inject heating circulation water into the cistern while monitoring the output signal, and when the output signal of the water level sensor indicates a high level water level, operate the circulation pump of the heating circulation water circuit, and reduce the water level in the cistern by operating the circulation pump. When the water level decreases and the output signal of the water level sensor shows the low level water level, continue to inject heating circulating water, and the water level in the cistern rises due to the injection of heating circulating water, and the output signal of the water level sensor shows the high level water level. While the water level continues to display and the water level decreases due to operation of the circulation pump and displays a low level water level, the heating circulating water continues to be injected and the output signal of the water level sensor displays a high level water level. After that, the high level water level continues to be displayed even after a predetermined time (T) has elapsed,
Further, when it is confirmed that the radiator is in operation, it is determined that the injection of the initial circulating water is completed.

[Effect]

According to the above method, the water level sensor monitors the rise and fall of the water level in the cistern without using the overflow from the drain port as the basis for judgment, and water injection is complete when the water level in the cistern reaches a high level. We continue to monitor the trend of the water level in the cistern by operating the circulation pump without any sudden interruptions, and if the water level drops due to operation of the circulation pump and reaches a low level, we continue to inject heating circulation water and also turn off the radiator. Since it is not determined that the injection is complete unless it is in operation, there is no risk of prematurely erroneously determining that the injection is complete and causing air to remain in the circuit.

When the water level in the cistern remains at a high level for a predetermined period of time (T), it is confirmed that the radiator is in operation and it is determined that the initial injection of heating circulating water has been completed. There is no risk of performing a long initial injection operation.

As described above, completion of the initial injection can be easily and accurately determined without requiring particularly advanced knowledge or experience.

Furthermore, the method of the present invention does not involve visually observing the overflow of circulating heating water, but rather monitors the output of the water level sensor and the operating signal of the radiator. It is also possible to have the control unit automatically determine the completion of the initial injection according to a program given in advance. Further, it is also possible to easily display the above judgment result by optical means such as a lamp, sound means such as a buzzer, or audio means by applying known techniques.

〔Example〕

FIG. 2(A) is a schematic illustration or explanatory diagram of a piping system and a control system of a hot water heating apparatus configured to carry out the method of the present invention.

The control unit 22 provided in the hot water heating device of this example is as follows:
The method explained in the section of means for solving the above-mentioned problems is given as a program, and the display lamp 26 is turned on when it is determined that the initial injection is completed as described below.

In FIG. 2(A), the injection pump 25 is operated with the on-off valves provided in the radiator 14 connected to the heating circulating water circuit opened, and the closed cistern 9
FIGS. 2(B) to 2(E) show changes in the state inside the cistern 9 when circulating heating water is injected into the cistern 9.

As shown in FIG. 2(B), a high level water level H and a low level water level are set for the water level sensor 21.

The above-mentioned high level water level H is a water level at which the hot water heating device can operate normally, and the low level water level is set lower than that. In this example, if the heating circulating water is at a low level, the circulation pump 10
When you operate the system and inhale the heating circulating water in the cistern 9,
The low level water level was set to such a level that it was thought that there was a risk of air getting mixed into the circulation pump 10.

27 is a guide plate for promoting the separation of air bubbles in the heating circulating water that has returned from the circulation circuit into the cistern 9.

FIG. 1 shows the operating state of each component in an example in which the hot water heating device shown in FIG. 2 is used and the initial injection method of heating circulating water according to the present invention is implemented by detecting the operation signal of the radiator. This is a chart showing the

FIG. 1(A) shows ON and OFF states of the infusion pump 25, and the horizontal axis is the time axis.

FIG. 1(B) shows ON and OFF states of the circulation pump 10, and the horizontal axis is the time axis.

FIG. 1(C) shows the output signal of the water level sensor 21, where H indicates a high level water level and L indicates a low level water level. The horizontal axis is the time axis.

FIG. 1(D) shows ON and OFF states of the indicator lamp 26, and the horizontal axis is the time axis.

FIG. 1(E) shows the operating states of the radiator 14: ON and OFF.
It represents FF, and the horizontal axis is the time axis.

The time axes of FIGS. 1A to 1E are common to each other.

Next, with reference to FIGS. 1 and 2, an example of implementing the initial injection method of heating circulating water according to the present invention will be described in chronological order.

In this example, the initial conditions (time to
), when the operation of the radiator was stopped.

When the injection pump 25 is operated to inject heating circulating water into the cistern 9, the water level within the cistern rises and the water level sensor outputs a water level signal representing a high level H as shown in FIG. 2(B). This state is at time t1 shown in FIG.
corresponds to

At this point, the cistern 9 is filled with heating circulating water, but it is not guaranteed that the heating water circulating circuit is filled with heating circulating water, and in many cases, there is a large amount of heating circulating water in the heating water circulating circuit. Air remains. Therefore, while continuing the operation of the injection pump 25 as shown in FIG. 1(A), the operation of the circulation pump is started at time t1 as shown in FIG. 1(B).

Since heating circulating water is contained in the cistern 9, air will not be sucked in even when the circulation pump 10 is operated, and there is no risk of damage to the circulation pump 10 due to so-called dry operation.

By operating the circulation pump 10, the heating circulating water in the cistern 9 is sent out to the heating circulating water circuit. However, since the heating circulating water circuit is still mostly filled with air, the amount of heating circulating water flowing back into the cistern 9 from the heating water circulating circuit is smaller than the amount sent out. As a result, the water level of heating circulating water in the cistern 9 decreases, as shown in Figure 1 (
As shown in C), the water level signal becomes low level at time L2. The state inside the cistern 9 at this time t2 is as shown in FIG. 2(C).

When the water level in the cistern 9 drops to the low level water level, the circulation pump 10 is stopped at time t2, as shown in FIG. 1(B).

When implementing the initial injection method of the present invention, the above time t2
The initial injection may be performed while the circulation pump 10 is continuously operated without stopping the circulation pump 10.

In this embodiment, the control unit 22 automatically operates and stops the circulation pump 1o.

Note that at the above time jl+j2, the injection pump 25 continues to operate as shown in FIG.
As shown in Figure (D), the display lamp 26 is not yet lit.

In this embodiment, at time t2, the circulation pump 10 was stopped while the injection pump 25 continued to operate. Then, the heating circulating water level in the cistern 9 gradually rises, and as shown in Figure 1 (C
), the water level becomes high level H at time t3. The state inside the cistern 9 at time t3 is shown in Figure 2 (D
) In this embodiment, this state (FIG. 2(D).

At time t3), as shown in FIG. 1(C), the circulation pump 1
0 operation has resumed.

As the circulation pump 10 resumes operation, residual air in the heating water circulation circuit is discharged, and the water level of the heating circulation water in the cistern 9 decreases.

At time t4, the water level of the heating circulating water in the cistern 9 becomes low level L (see Fig. 1 (C)), so in this embodiment, the operation of the circulation pump 10 is stopped at this time L4 (see Fig. 1). (See (B)).

The state inside the cistern 9 at time t4 is the state at time t
This is almost the same as FIG. 2 (C) depicting the state No. 2.

In this way, the operation of removing residual air in the heating circulating water circuit and replacing it with heating circulating water progresses from time t1 to t4, but due to changes in the state inside the cistern 9 and the water level signal level, And if we look at the operation to stop operation of the circulation pump 10, the changes and operations from time t3 to t4 are different from time t1.
→Change during t2.

This is a repeated operation.

However, even during this time, the operation of the injection pump 25 continues and heating circulating water is injected into the closed heating circulating water circuit, so although the inside of the heating circulating water circuit cannot be seen, residual air is discharged. It is easy to infer that this is progressing.

In FIG. 1, the time between 5 and 4 and time t5 is omitted, but even during this period, time t, 1→j2+time t
Repeat the same operation as in 3→t4.

The injection pump 25 continues to operate during the above-described repeated operations, and the removal of residual air in the heating circulating water circuit (filling of the heating circulating water) further progresses.

As can be easily understood from the configuration of the heating circulating water circuit explained in Figure 3 and the injection operation explained in Figures 2 (B) to (E), the initial injection is completed and the heating circulating water circuit is filled with water. Then, even if the circulation pump 10 is operated, the water level in the cistern 9 will not drop (assuming that there is no water level change due to thermal expansion, contraction, or water leakage).

Further, as the residual air in the heating circulating water circuit decreases and water injection approaches completion, the water level in the cistern 9 becomes less likely to fall.

When water injection is completed and residual air disappears by repeating the above-mentioned operation between time t4 and time t5 shown in FIG. 1, the interior of the cistern 9 becomes as shown in FIG. As the operation continues, heating circulating water overflows into the cistern 9, pushes open the expansion valve 18, flows into the reserve tank 19, and overflows from the drain port 20.

Even when the circulation pump 10 is operated, the flow rate at which heating circulating water is sucked in from the cistern 9 and sent to the heating circulating water circuit is equal to the flow rate at which the heating circulating water is returned from the heating circulating water circuit into the cistern 9. The detection signal of the water level sensor 21 maintains the high level water level H.

Therefore, after the initial injection of heating circulating water is completed, the first
As shown in Figure (B), even if the operation of the circulation pump 10 is restarted at time t5, the water level signal continues to output the high level water level H as shown in Figure (C), and at time t6 when the predetermined time T has elapsed. The water level detection signal does not drop even after

When carrying out the method of the present invention, it is desirable to experimentally determine the value of the above-mentioned time T in advance.

In this example, the signal output of the water level sensor continues to be at the high level H even after the predetermined time T elapses, at a time t6.
Then, the display lamp 26 is turned on as shown in FIG. 1(D).

The above indicator lamp 26 indicates that the high level water level remains constant for a predetermined time T.
However, in addition, (i) it lights up continuously if the operation signal from the radiator 14 is input to the control unit 22, and (ii) the operation signal from the radiator 14 continues to turn on. If there is no input to the control unit 22, the light will blink.

At time t6 in this embodiment, the radiator 14 has stopped operating and the operation signal (see FIG. 1 (E)) is OFF, so the indicator lamp 26 does not light up continuously at time t6. , blinks as shown in FIG. 1(E).

Then, the operator noticed that the radiator 14 was stopped (the solenoid valve of the radiator was closed) due to the blinking of the indicator lamp, and at time t7 immediately after time t6, he manually operated the radiator 14. was driven. As a result, the solenoid valve of the radiator is opened, and the heating circulating water is also sent into the heating circulating water circuit beyond the solenoid valve, so the water level in the cistern 9 is lowered and the above time t7 (the radiator Immediately after the start of operation/opening of the solenoid valve, the water level signal becomes low level (
(See Figure 1(C)).

In this way, the initial injection of heating circulating water continues. During this time, the injection pump 25 continues to operate as shown in FIG. 1(A), so the initial injection of the heating circulating water progresses.

At time j+'+ t2', the same operation as at time tlt t2 described above is repeated, and similarly at time j 3' r j 4', the aforementioned time t
The same operation as at 3+t4 is repeated, and at time t5
' After the water level detection signal becomes the high level water level H, the high level water level H is maintained until time T elapses, and time t
At 6', the display lamp 26 was lit continuously (see FIG. 1(D)).

In this example, the operator noticed the lighting of the indicator lamp 26 at time t8, immediately after time t6', and stopped the infusion pump 25 at time t8, as shown in FIG. 1(A). Subsequently, the circulation pump 10 is also stopped, the 1 indicator lamp is turned off, the radiator is stopped, and the initial heating circulating water injection operation is completed.

When carrying out the present invention, at time t6' when the water level sensor detection signal continues to be at the high level H for a time T and the operation of the radiator is confirmed, the control unit 22 causes the indicator lamp 26 to be lit continuously, Infusion pump 25 and circulation pump 10 may be automatically stopped.

In this embodiment, as described above, the operation of the circulation pump is intermittent while monitoring the water level of the heating circulation water in the closed cistern using the water level sensor, without relying on visual inspection of the heating circulation water overflow.

In addition, when the high level water level H is maintained for a predetermined time T after the circulation pump restarts, it is confirmed that the radiator is operating and it is determined that the initial injection of heating circulating water is completed. This method does not require special experience, advanced knowledge, or skill in working tools, and it is possible to easily and accurately judge when to complete the initial injection of circulating heating water.

Therefore, there is no risk of air remaining in the heating circulating water circuit due to premature termination of the initial heating circulating water injection operation, and problems caused by residual air (noise, vibrations).

cavitation) can be prevented.

Especially when the temperature is high, there is no risk of forgetting that the radiator is not operating.

Furthermore, there is no risk of operating the injection pump 25 for a long time after the residual air in the heating circulating water circuit is exhausted and the initial injection of heating circulating water is completed.

Furthermore, there is no need to visually check the overflow, and the completion of the initial injection of heating circulating water is determined based on the output signal of the water level sensor and the operation signal of the radiator, so it is suitable for automating the initial injection of heating circulating water. be.

〔Effect of the invention〕

As explained above, according to the method for initial injection of heating circulating water in a hot water heating system according to the present invention, the worker does not need any special experience, advanced knowledge, or skill, and moreover, the initial injection of heating circulating water can be carried out in a hot water heating system. Completion can be easily and accurately determined.

Therefore, there is no risk of air remaining in the heating circulating water circuit due to premature termination of the initial heating circulating water injection operation, and noise and vibration caused by the residual air are generated.

In addition, it is possible to prevent wear and tear caused by cavitation.

In addition, there is no risk of increasing construction costs by continuing the initial injection operation of heating circulating water more than necessary.

Furthermore, the completion of the initial injection of heating circulating water is determined based on the output signal of the water level sensor and the operation signal of the radiator, without visually observing the overflow of heating circulating water.
It is easy to automate the initial injection operation of heating circulating water.

[Brief explanation of drawings]

FIG. 1 is a chart showing the operating states of equipment in an embodiment of the initial injection method of circulating water in a hot water heating system according to the present invention, in which (A) represents ON and OFF of the injection pump, and (B) is the circulation pump ON. (C) represents the level of the output signal of the water level sensor, and (D) represents the ON state of the indicator lamp. OFF, and (E) represents the operation signal of the radiator. FIG. 2 (A,) is an explanatory diagram schematically depicting a part of the piping system and control system of the hot water heating device used in the above embodiment, and FIG. FIG. 3 is an explanatory diagram of the state inside the closed cistern in FIG. Fig. 3 is an explanatory diagram of a hot water heating system equipped with a closed system heating circulating water circuit, and Fig. 4 is an explanatory diagram schematically depicting a cross section of a closed cistern used in the above hot water heating system. be. 4...Burner, 7...Heat exchanger, 9...Closed cistern, 10...Circulation pump, 14...Radiator,
18... Expansion valve, 19... Reserve tank, 20...
Train port, 21--Water level sensor, 22--Control unit, 2
5... Infusion pump, 26... Display lamp.

Claims (1)

[Claims] 1. In a method for initially injecting heating circulating water into a hot water heating apparatus equipped with a closed system heating circulating water circuit, an operation signal of a radiator, which is an indoor unit, is detected, and A water level sensor is provided to detect the water level, and a high level water level is set when the required amount of heating circulating water is stored in the cistern, and a lower low level water level is set, and the output signal of the water level sensor is set. Inject heating circulating water into the cistern while monitoring, and when the output signal of the water level sensor indicates a high level water level, operate the circulation pump of the heating circulating water circuit, and the operation of the circulation pump will lower the water level in the cistern. When the output signal of the water level sensor shows a low level water level, the injection of heating circulating water continues, and the water level in the cistern rises due to the injection of heating circulating water, and the output signal of the water level sensor shows a high level water level. While the water level is repeatedly lowering due to operation of the circulation pump and displaying a low level water level, the heating circulating water continues to be injected, and after the output signal of the water level sensor indicates a high level water level,
It is characterized in that it is determined that the initial circulating water injection is completed when the high level water level continues to be displayed even after a predetermined time (T) has elapsed and the radiator is in operation. , Initial injection method of circulating water in hot water heating equipment.