JPH06147510A - Hot water heating system - Google Patents

Abstract

PURPOSE:To effectively detect improper supply of heating circulation water by connecting an end of a return tube of a circulation passage for circulating hot water to a top of a tank, providing circulation detecting means such as electrodes, etc., for detecting a water flow in the tank, and connecting an end of a bypass passage to a bottom of the tank. CONSTITUTION:A hot water heating system has a heat exchanger 6 to be heated by a burner 17, supplies water obtained from the exchanger 6 to a heat radiator 21 via a circulation passage 2 to heat, and then circulates the water to the exchanger 6 through a tank 4. In this case, in the case of an initial use, water feed means 11 is opened, water is fed to the tank 4, then a pump 5 is energized, and a heating medium supply valve 8 is opened to circulate the hot water. In this case, a timer 22 is set under the condition that high water level detecting means 14 is ON, and when a predetermined time is elapsed, whether circulation detecting means 15 is ON or not is decided. When it is not ON, the hot water is not circulated, and hence the means 11, heating medium supply means 11 are closed. Then, the pump 5 is deenergized to be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an object to provide a hot water heating system for surely injecting water into the hot water heating system.

[0002]

2. Description of the Related Art Conventionally, as an example of an initial method of injecting circulating water in a hot water heater, there is JP-A-3-233231. In this example, it was judged that the injection of the circulating water was completed when the water level in the tank storing the circulating water continued at a predetermined high water level for a predetermined time (T).

[0003]

However, in the above-mentioned conventional example, when the heat medium supply valve for supplying the hot water to the heating terminal is provided, the heat medium supply valve is closed due to a failure. If the water level in the tank continues to reach a predetermined high water level for a predetermined time (T), it is considered that the water injection in the hot water heating device is completed and the water injection is ended. Therefore, although water was not reliably injected in the circulation path downstream of the heat medium supply valve, it was erroneously determined that water injection was completed.

Further, in the above-mentioned conventional example, since the heating terminal is constituted by a thin tube such as a panel heater, the thin tube has a large piping resistance and dust is likely to occur. Therefore, even if the heat medium supply valve is normally opened and the water level in the tank continues to be a predetermined high water level for a predetermined time (T), water filling in the heating terminal and the return pipe is not reliably performed. Despite this, it was erroneously determined that water injection was completed.

Therefore, an object of the present invention is to solve the above problems, that is, to provide a hot water heating system capable of reliably detecting poor water injection.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a circulation path consisting of an outflow pipe and a return pipe for supplying hot water, and the outflow pipe has a starting end at a lower portion of a tank for storing hot water. A pump that circulates hot water from the upstream side of the outgoing pipe and a heat exchanger that heats the hot water are arranged in order, the end of the outgoing pipe is connected to a heating terminal such as a radiator, and the return pipe is a heating terminal. The end of the bypass is connected to the upper part of the tank, the end of the bypass is connected to the lower part of the heat exchanger in the outflow pipe, and the end of the bypass is connected to the lower part of the tank. A low water level detecting means for detecting, a high water level detecting means for detecting a predetermined high water level or higher, a circulation detecting means such as an electrode for detecting a water flow, and a water supply means for supplying hot water into the tank are provided. 1 features, While the hot water is supplied to the tank by the water means, the pump is turned on to fill the tank, the circulation path, the bypass path and the heating terminal, and the output signal of the high water level detection means has a predetermined high water level or higher for a predetermined time. A second feature is that a determining means is provided for determining that the injection of the circulating water is completed when the water flow is detected by the output signal of the circulation detecting means.

[0007]

In the present invention, the end of the return pipe of the circulation path through which hot water circulates is connected to the upper part of the tank, and the circulation detection means such as an electrode for detecting the water flow is provided in the tank, and the end of the bypass path is connected to the lower part of the tank. Since it is connected, it is possible to reliably detect defective injection of heating circulating water.

Further, while supplying hot water into the tank by the water supply means, the pump is turned on to fill the tank, the circulation path, the bypass path, and the heating terminal with water, and the output signal of the high water level detecting means is set to a predetermined high water level or more in advance. Since the determination means for determining the completion of the injection of the circulating water is provided if the output signal of the circulation detecting means detects the water flow for the predetermined time, it is possible to further reliably detect the defective pouring of the heating circulating water.

[0009]

1 is a diagram showing the construction of a hot water heating system according to the present invention. A hot water heater 1 has a forward pipe 2 and a return pipe 3 for circulating circulating water for heating.

The forward pipe 2 originates from a lower portion of a tank 4 for storing hot water, and a pump 5 for circulating hot water from the upstream side of the forward pipe 2, a heat exchanger 6 for heating the hot water, and a heat exchanger. A temperature sensor 7 for detecting the temperature of hot water heated by 6 and an opening / closing type heat medium supply valve 8 for supplying hot water to a heating terminal 9 to be described later are arranged in order, and the end of the outflow pipe 2 is a heating terminal. Connected to machine 9.

Reference numeral 9 is a heating terminal, which is composed of a radiator composed of a thin tube such as a panel heater.

The return pipe 3 emits its starting end to the heating terminal 9,
A temperature sensor 10 for detecting the temperature of hot water after the heat is dissipated by the heating terminal 9 is arranged, and the end of the return pipe 3 is connected to the upper part of the tank 4.

The tank 4 is provided with a water supply means 11 capable of supplying city water into the tank 4 by opening the tank 4, and an ON-OFF type low water level detection means for detecting a predetermined low water level or higher in the tank 4. 12 and an ON-OFF type medium water level detecting means 13 for detecting a predetermined medium water level or higher higher than the low water level.
And O for detecting a predetermined high water level higher than the middle water level.
An N-OFF type high water level detecting means 14 is arranged.

Reference numeral 15 is a circulation detecting means constituted by an electrode rod or the like, and the circulation detecting means 15 is arranged at a vertically lower portion of the end of the return pipe 3, that is, a position where the dropped circulating heating hot water hits the return pipe 3. It turns ON when the water flow of the heating circulation hot water is detected. Reference numeral 16 denotes an overflow port that allows drainage to the outside of the tank 4. The circulation detecting means 15 is installed above the water level detecting means 12, 13, and 14.

Reference numeral 17 denotes a burner for heating the heat exchanger 6, which opens the on-off valve 18 and changes the opening degree of the proportional valve 19 to obtain the required gas amount.

Reference numeral 20 denotes a bypass passage which is branched at the downstream side of the temperature sensor 7 in the outflow pipe 2 and whose end is branched to the lower end of the tank 4. The end of the bypass passage is not connected to the return pipe 3, but when the heat medium supply valve 8 fails and is closed, the circulation detecting means 15 malfunctions due to the circulating water flow in the bypass passage 20 and is turned on. This is to prevent

Reference numeral 21 denotes a controller for controlling the controlled device such as the proportional valve, which is provided with a timer 22 having a timing function and a judging means 23 for judging whether or not the water filling is completed.

Reference numeral 24 is a remote controller connected to the controller 21, and a trial run switch 25 for performing water filling,
A display unit 26 for displaying a failure location is provided.

Although three kinds of water level detecting means for detecting the water level in the tank are provided in the tank of the present invention, a low water level detecting means for detecting a predetermined low water level or more and a predetermined water level higher than the low water level. It is also possible to use only two types of high water level detecting means for detecting the high water level or higher.

FIG. 2 is a sequence diagram showing the contents of control of the present invention. When the trial run switch 25 is turned on (S
1), the water supply means 11 is opened to inject city water into the tank 4, the pump 5 is turned on, and the heat medium supply valve 8 is opened to circulate the heating circulating hot water (S2).

In step 3, it is judged whether or not the high water level detecting means 14 in the tank 4 is ON. If the high water level detecting means 14 is ON, the timer 22 is set,
That is, the timing operation of the timer 22 is started (S4), and it is determined whether or not the time T after setting the timer has exceeded a certain time T0 (S5).

The constant time T0 in step 5 means, for example, that the heating system designer decides in advance the sufficient time required for the initial pouring of the heating circulating water by an experiment or the initial time interval at which the initial pouring is considered to be completed. Each time the water injection operation is carried out, it may be stored in the controller, and the fixed time T0 may be set based on the stored time interval data.

If the predetermined time T0 has not elapsed in step 5, the process returns to step 3 again, and the high water level detecting means 14
If is not ON, the timer 22 is reset (S
8).

When a certain time T0 has passed in step 5, it is judged whether or not the circulation detecting means 15 is ON (S6). If the circulation detecting means 15 is ON, the water supply means 11 is closed and the pump 5 is turned off, the heat medium supply valve 8 is closed, and the pouring of the heating circulating hot water is completed (S7).

At step 6, the circulation detecting means 15 is turned off.
If it is not N, the heating circulating hot water is not circulating,
The water supply means 11 is closed, the pump 5 is turned off, the heat medium supply valve 8 is closed, and the display unit 26 is caused to perform a safe operation of displaying the circulation failure of the heating circulating hot water (S9).

In short, according to the present invention, the end of the bypass passage 20 branched from the forward end of the outflow pipe 2 is provided in the lower portion of the tank 4,
Since the end of the return pipe 3 is connected to the upper part of the tank 4, and the circulation detecting means 15 for detecting the water flow of the heating circulating water is arranged in the tank 4 below the end of the return pipe 3, a failure of the heat medium supply valve 8 occurs. Alternatively, it is possible to reliably detect the water filling failure of the heating circulating water due to the clogging of the thin tubes forming the heating terminal 9. Further, if the output signal of the high water level detection means continues to be higher than a predetermined high water level for a predetermined time, and the output signal of the circulation detection means detects a water flow, it is determined that the injection of the circulating water is completed. Since it is provided, the water filling failure of the heating circulating water can be detected more reliably.

[0027]

In the hot water heating system of the present invention, the end of the bypass passage is connected not to the return pipe but to the lower portion of the tank.
The circulation detecting means provided in the tank is not turned on by the water flow in the bypass passage, and the malfunction of the circulation detecting means can be prevented.

Further, since the circulation detecting means is provided in the tank below the end of the return pipe, it is ensured that the heating circulating water is not filled with water due to the failure of the heat medium supply valve or the clogging of the narrow pipes constituting the heating terminal. Can be detected.

Further, in addition to the above configuration, if the output signal of the high water level detecting means detects a predetermined high water level or more for a predetermined time and the output signal of the circulation detecting means detects a water flow, circulating water is injected. Since the determination means for determining that the heating has been completed is provided, it is possible to detect the water filling failure of the heating circulating water more reliably.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a hot water heating system of the present invention.

FIG. 2 is a sequence diagram showing the contents of control of the present invention.

[Explanation of symbols]

 2 Forward pipe (circulation path) 3 Return pipe (circulation path) 4 Tank 5 Pump 6 Heat exchanger 9 Heating terminal 12 Low water level detection means 13 Medium water level detection means 14 High water level detection means 15 Circulation detection means 20 Bypass path

Claims (2)

[Claims] 1. A circulation path composed of an outflow pipe and a return pipe for supplying hot water, and a pump for starting the hot water from a lower part of a tank for storing the hot water and circulating the hot water from the upstream side of the outflow pipe. A heat exchanger for heating hot water is arranged in order,
The end of the outflow pipe is connected to a heating terminal such as a radiator, the return pipe originates from the heating terminal, the end is connected to the upper part of the tank, and the start end of the bypass passage is located downstream of the heat exchanger in the outflow pipe. At the same time, the end of the bypass passage is connected to the lower part of the tank, and in the tank, a low water level detecting means for detecting a predetermined low water level or higher, a high water level detecting means for detecting a predetermined high water level or higher, an electrode for detecting a water flow, etc. A hot water heating system comprising: a circulation detecting means and a water supply means for supplying hot water into the tank. 2. The water is supplied to the tank by the water supply means while the pump is turned on to fill the tank, the circulation path, the bypass path, and the heating terminal with water, and the output signal of the high water level detection means keeps a predetermined high water level or higher. The judging means for judging that the injection of the circulating water is completed when the water signal is detected by the output signal of the circulation detecting means for a predetermined time is provided. Hot water heating system.