JPH0285617A - Warm water type floor heater - Google Patents

Abstract

PURPOSE:To open a bypass pipe line only at the time of interruption of passing water, by a method wherein a bypass pipe having a shut-off valve, which becomes open only when a passing water control valve is closed, connects between a feed path pipe and return path pipe at an upstream side of the passing water control valve. CONSTITUTION:A bypass pipe line 10 connecting a feed path pipe 3 and return path pipe 4 at an upstream side of a thermal valve 5 is provided and the bypass pipe line 10 is provided with a shut-off valve 11 which becomes open when the thermal valve 5 is closed. In other words, when the thermal valve 5 is pen, a valve body is held under a closed state and warm water flowing back to a warm water boiler 2 through the bypass pipe line 10 is not generated. When the thermal valve 5 is made close in this connection, the valve body is made open through differential pressure of that time and the warm water is returned to the return path pipe 4 from the feed path pipe 3 through the bypass pipe line 10. With such constitution, local boiling within a boiler heat exchanger is not generated. Then even if the bypass pipe line 10 is provided, it does not happen that a heat loss is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot water type floor heating system, and more specifically, to its water flow control means.

[Conventional technology]

As shown in FIG. 3, in a hot water floor heating system, a radiator 1 is placed on the floor, and a hot water boiler 2 is placed on the floor.
are installed outdoors, and are connected by a pair of outbound pipes 3 and return pipes 4 to circulate and supply hot water to the radiator 1.

The outgoing pipe 3 is provided with a water flow control valve (thermal valve) 5, and on the other hand, a water temperature sensor 6 is installed on the returning pipe 4 side. By detecting the water temperature and controlling the amount of water flowing to the radiator 1 by opening and closing the thermal valve 5 based on the detected water temperature, the interior of the room is maintained at a predetermined temperature atmosphere. -Also, when the radiator 1 is not in use, the thermal valve 5 is closed.

[Problem to be solved by the invention]

According to the above temperature control, when the room temperature reaches a predetermined temperature,
Thermal valve 5 is closed and hot water supply to radiator 1 is cut off, but if the boiler is burning, local boiling will occur inside the boiler's heat exchanger, and the safety device will be activated. For example, overheating prevention devices may be activated.

In order to prevent this, there is a system in which a bypass pipe 7 is connected between the outgoing pipe 3 and the returning pipe 4, as shown by the chain line in FIG. Therefore, heat loss is large and it is uneconomical.

This invention was made in view of the above-mentioned conventional circumstances, and its purpose is to provide a hot water floor heating system in which a bypass pipe from an outgoing pipe to a returning pipe is opened only when one water flow is cut off. .

[Means to solve the problem]

In order to achieve the above object, in this invention.

It includes a radiator placed on the floor, and a hot water boiler that circulates hot water to the radiator through a pair of outbound pipes and a return pipe, and based on a detection signal from a water temperature sensor provided on the return pipe side. In the hot water type floor heating system, which maintains a heating atmosphere at a predetermined temperature by opening and closing a water flow control valve provided in the outgoing pipe.

The present invention is characterized in that a bypass pipe having an on-off valve that opens when the water flow control valve is closed is connected between the outgoing pipe and the return pipe at a predetermined portion upstream of the water flow control valve.

The above-mentioned on-off valve is preferably a check valve having a spring-loaded valve body solely from the viewpoint of cost, but may be a solenoid valve in some cases.

[For production]

As described above, since the on-off valve of the bypass pipe is opened when water flow is cut off, there is no risk of local boiling occurring inside the heat exchanger of the boiler. In addition, at times other than when water flow is cut off,
Since the bypass pipe is closed, there is almost no heat loss.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2. Note that although only the main parts are shown in these figures, please refer to the conventional example (FIG. 3) described earlier for the hot water boiler and the like.

According to this hot water floor heating system, a bypass pipe IQ is provided on the upstream side of the thermal valve 5 (hot water boiler side) to connect the outgoing pipe 3 and the returning pipe 4. This bypass conduit 10 is provided with an on-off valve 11 that opens when the thermal valve 5 is closed.

In this embodiment, the on-off valve 11 is a check valve having a valve body i1b that is biased and held in a closed state by a spring lla. In this example, when the thermal valve 5 is open, the differential pressure between the outgoing pipe 3 and the incoming pipe 4 is 0.07 kg/aJ, whereas when the thermal valve 5 is closed, the differential pressure is 0.6 kg/aJ. /d, so
Taking this into consideration, the spring pressure of the spring lla is determined.

That is, when the thermal valve 5 is open, the valve body 11a is in the second position.
The bypass pipe 1 is maintained in a closed state as shown by the solid line in the figure.
There is no hot water flowing back to the hot water boiler 2 via the hot water boiler 2. On the other hand, when the thermal valve 5 is closed, the differential pressure at that time causes the valve body 11a to open as shown by the chain line in FIG. It will be returned to the return pipe 4 via the pipe.

In the above embodiment, a mechanical check valve is used as the on-off valve 11, but in some cases, a solenoid valve may be used to open and close the valve alternately with the thermal valve 5.
good.

〔Effect of the invention〕

As explained above, according to the present invention, by opening the bypass pipe from the outgoing pipe to the returning pipe only when water flow is cut off, local boiling does not occur inside the boiler heat exchanger. Furthermore, even if a bypass pipe line is provided,
No heat loss occurs.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is a sectional view showing an on-off valve applied to the same embodiment, and FIG. 3 is a schematic diagram showing a conventional example. In the figure, 1 is a radiator, 2 is a hot water boiler, 3 is an outgoing pipe, 4 is a return pipe, 5 is a water flow control valve (thermal valve), 6 is a water temperature sensor, 10 is a bypass pipe, and 11 is an on-off valve. It is. Patent applicant: Fujitsu General Co., Ltd. Agent: Patent attorney: Takuya Ohara Figure 1 Figure 2

Claims (3)

[Claims] (1) Includes a radiator placed on the floor and a hot water boiler that circulates hot water to the radiator through a pair of outgoing pipes and a returning pipe, and detects a detection signal from a water temperature sensor installed on the returning pipe side. In a hot water floor heating system that maintains a heating atmosphere at a predetermined temperature by opening and closing a water flow control valve provided in the outgoing pipe based on A hot water floor heating system, characterized in that a bypass pipe having an on-off valve that opens when the water flow control valve is closed is connected between an outgoing pipe and a returning pipe. (2) The hot water floor heating system according to claim 1, wherein the on-off valve is a check valve that has a spring-loaded valve body and opens and closes depending on the pressure difference between the outgoing pipe and the incoming pipe. (3) The hot water floor heating system according to claim 1, wherein the on-off valve is a solenoid valve that opens and closes alternately with the water flow control valve.