JPH05272765A - Hot-water heater - Google Patents

Abstract

PURPOSE:To carry out silent and stabilized heating operation by a method wherein air, stagnated in a circulating passage, is purged by impacts generated by the repetition of starting and stopping of a circulating pump. CONSTITUTION:When a circulating pump 3 is being operated continuously for a specified period of time, it is considered that a circulating passage 1 is filled with water and the power supply of the circulating pump 3 is put ON-OFF forcibly a plurality of times repeatedly. Air (which can not be bled easily by only operating the circulating pump 3 continuously), stagnated in the circulating passage 1, is bled by impacts generated by the repetition of the starting and stopping of the circulating pump 3. Thereafter, when water feeding is continued and the level of water in a water replenishing tank has arrived at a specified level, a water replenishing solenoid valve 5 is closed to stop water feeding. Subsequently, water feeding mode is switched into automatic water feeding mode whereby the operating condition is switched into a condition capable of effecting heating operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heating apparatus, and more particularly to a hot water heating apparatus capable of reliably expelling (withdrawing) air accumulated in a circulation path of water, which is a heat medium.

[0002]

2. Description of the Related Art A conventional hot water heating apparatus usually supplies water, which is a heat medium, from a makeup water tank to a heat exchanger for heating water by a circulation pump to heat the water to a predetermined temperature, and heats the water to a predetermined temperature. The heat radiating means that is circulated through the path (circulation path) and is disposed at a place to be heated is configured to perform heating by radiating the heat of water (hot water).

In such a hot water heating apparatus, for example, when water is filled (filled with water) in the circulation path at the time of trial operation, water is supplied from the water supply pipe to the makeup water tank, and the makeup water tank is supplied by the water level sensor. The water level in the circulation path is detected by detecting the water level in the water and operating the circulation pump when the water level reaches a predetermined amount (L point) and stopping the circulation pump when the water level falls below the predetermined amount (L point). Is full.

[0004]

However, in the above-mentioned conventional hot water heater, it is not possible to completely prevent the accumulation of air in the water circulation path, and the circulation pump is continuously operated. The air accumulated in the circulation path cannot be completely expelled (extracted) only by circulating the water through the circulation path.

When the hot water heating device is operated in a state where air is accumulated in the circulation path, the flow rate of the circulation pump varies and the heating capacity fluctuates, or water boils in the water heating heat exchanger. In addition, there is a problem that the noise of the circulation pump becomes large.

The present invention solves the above problems and provides a hot water heating apparatus capable of easily and surely expelling water accumulated in a circulation path and performing quiet and stable heating operation. With the goal.

[0007]

In order to achieve the above object, a hot water heating apparatus of the present invention has a makeup water tank and a circulation for circulating water in a circulation passage of water which is a heat medium. A hot water heating device formed by arranging a pump, a water heating heat exchanger for heating water, and a heat radiating means for radiating hot water heated in the water heating heat exchanger, the control means comprising: Thus, the power of the circulation pump is forcibly turned on and off a plurality of times, and the air accumulated in the circulation path is expelled by the impact generated by repeating the start and stop of the circulation pump.

[0008]

[Operation] Due to the impact when the circulation pump repeatedly starts and stops, it is possible to expel air from the circulation path that cannot be expelled by simply operating the circulation pump to circulate water through the circulation path. Therefore, it becomes possible to perform a quiet and stable heating operation.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of a hot water heating apparatus according to an embodiment of the present invention.

In the hot water heating apparatus of this embodiment, a makeup water tank 2 is provided in a circulation path 1 for circulating water as a heat medium, a circulation pump 3 for circulating water in the circulation path 1, and a heat exchange for water heating. It is formed by arranging the container 4 and a heat radiating heat exchanger (heat radiating means) 1c for radiating water (warm water).

A forward water pipe 1a and a return water pipe 1b forming the circulation passage 1 are connected to the makeup water tank 2.
Further, a water supply pipe 6 having a makeup water solenoid valve 5 is connected. Further, in the makeup water tank 2, a water level sensor 12 (for L point detection) and 13 (for H point detection) for detecting the water level.
Is attached.

The water heating heat exchanger 4 heats water by exchanging heat with the combustion gas burned by the burner 10 for the fuel gas supplied from the gas supply pipe 9 having the heating valve 7 and the proportional valve 8. The water heating heat exchanger 4 is connected to the circulation passage 1 by a bypass passage 11 branched from the circulation passage 1.

The circulation pump 3 is connected to the control means 14. When the water level in the makeup water tank 2 reaches a predetermined water level (point L) during the initial water injection into the circulation path 1, the control means 14 turns on the power of the circulation pump 3 under a predetermined condition. Repeated multiple times to force ON-OF
The circulation pump 3 is repeatedly turned on and off, and the circulation pump 3 is repeatedly started and stopped. Further, the control means 14 is connected to the makeup water solenoid valve 5, the heating valve 7, the proportional valve 8 and the like,
By controlling these, the entire hot water heating device is controlled.

Next, the operation in the process of injecting water into the circulation path of the hot water heating apparatus of the above embodiment (for example, the water injecting process during the trial run) will be described with reference to the flowchart of FIG. First, the control means 14 is operated to set the operation mode (water supply mode) to initial water injection, and then the power is turned on (step 1), the makeup water solenoid valve 5 is turned on (step 2),
Water is supplied to the makeup water tank 2, the water level sensor 12 detects the water level of the makeup water tank 2 (step 3), and if the water level does not reach point L, the water supply to the makeup water tank 2 is continued, When the water level reaches point L, the circulation pump 3
Is turned on (step 4), and water is supplied (circulated) to the circulation path 1. Then, while operating the circulation pump 3 to supply (circulate) water to the circulation path 1, the water level of the makeup water tank 2 is detected (step 5), and when the water level becomes below the L point, the circulation pump 3 is stopped ( In step 6), when the water level reaches point L again, the circulation pump 3 is operated to supply (circulate) water to the circulation path 1.

Then, it is judged whether or not the circulation pump 3 is continuously ON for a predetermined time (step 7), and when the circulation pump 3 is continuously ON for the predetermined time,
It is considered that the circulation path 1 is filled with water, and the circulation pump 3 is forcibly turned on and off by repeating the power supply a plurality of times, and the circulation pump 1 is repeatedly started and stopped. The accumulated air (air that cannot be easily extracted only by continuously operating the circulation pump 3) is extracted (step 8). After that, the water supply is continued and it is determined whether or not the water level of the makeup water tank 2 reaches the H point (step 9). When the water level reaches the H point, the makeup water solenoid valve 5 is closed and the water supply is stopped ( Step 10). After that, the heating operation is enabled by setting the water supply mode to automatic water supply.

In the above embodiment, it is determined in step 7 whether the circulation pump 3 is continuously ON for a predetermined time, and when it is continuously ON for the predetermined time, the power of the circulation pump 3 is turned on a plurality of times. Repeatedly forced ON-OFF
The reason why the circulation pump 3 is repeatedly started and stopped is that when the piping path (circulation path 1) is long, the circulation pump 3 is frequently turned on and off (a short pitch when the large amount of air is discharged). (Steps 4 to 6), the circulation pump 3 is forced to O in such a transient state.
This is because it is considered that the intended effect (the effect of expelling air that is difficult to expel by simply circulating water in the circulation path 1) cannot be obtained even when the N-OFF is performed.

However, in the case where it is necessary to expel the air accumulated in the circulation path 1 (for example, when it is found that the air is entrained in the circulation path 1 during the heating operation, and the heating operation is stopped to remove air). Etc.), the power of the circulation pump 3 is repeated a plurality of times to forcibly turn on the power without turning on the circulation pump 3 for a predetermined time.
It is also possible to extinguish the air by repeating N-OFF and repeatedly starting and stopping the circulation pump 3.

As described above, in the hot water heating system of this embodiment, air is expelled from the circulation path 1 by the impact when the circulation pump 3 is repeatedly started and stopped.
The air that cannot be expelled only by continuously operating the circulation pump 3 is expelled from the circulation path 1 to prevent noise generated when circulating water (warm water) entrained with air. It is possible to prevent variations in heating capacity, and it is possible to perform quiet and stable heating operation.

In the hot water heating apparatus of the present invention, not only the case where the air is expelled from the circulation path in the water injection process at the time of trial operation, but the case where the air accumulated in the circulation path needs to be expelled under other circumstances, By the procedure similar to the procedure of the above-mentioned embodiment, the air accumulated in the circulation path can be easily expelled.

Further, the present invention can be applied not only to the apparatus dedicated to hot water heating as in the above embodiment, but also to a combined hot water supply / room heating apparatus in which hot water heating and hot water supply for bath are combined.

[0021]

As described above, in the hot water heating system according to the present invention, the control means repeatedly turns on and off the power of the circulating pump a plurality of times to forcibly turn it on and off, and the shock is generated by repeatedly starting and stopping the circulating pump. Since the air accumulated in the circulation path is expelled, the air that cannot be expelled by simply operating the circulation pump continuously, can be expelled from the circulation path easily, reliably, and quickly. This makes it possible to prevent noise that would occur when circulating water (warm water) entrained with air, prevent variations in heating capacity, and perform quiet and stable heating operation.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a hot water heating apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation in a water injection process of the hot water heating device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Circulation Path 1c Heat Dissipation Means 2 Makeup Water Tank 3 Circulation Pump 4 Water Heating Heat Exchanger 14 Control Means

Claims (1)

[Claims] 1. A makeup water tank, a circulation pump for circulating water in the circulation path, a water heating heat exchanger for heating water, and a water heating heat exchange in a circulation path of water as a heat medium. A hot water heating device formed by arranging a heat radiating means for radiating heated hot water in a container, wherein the control means repeatedly turns on the power of the circulation pump a plurality of times to forcibly turn on the power.
A hot water heating device characterized in that the air accumulated in the circulation path is expelled by an impact generated by repeatedly turning it off and starting and stopping the circulation pump.