JPH03195832A - Apparatus for supplying and circulating hot water in central hot water supplying system - Google Patents

Abstract

PURPOSE:To save energy and decrease erosion by connecting a timer to a circulation pump, the timer being set so as it cannot lower the temperature of hot water at every branching point for a water supply plug down to an inconvenient value, and controlling the ON-OFF of the pump. CONSTITUTION:On the discharge side of a circulation pump 2 connected to the upper part of a hot water tank 1, a water sending pipe 4 is provided between the pump 4 and a cock 3 on each floor, and a water return pipe 5 between the cock 3 and the tank 1. A heat source 6 is housed in the tank 1. The pump 2 is connected with a timer 9, which is set at a precalculated time required for the temperature of hot water on the discharge side of the pump 2 to drop down from a favorable value to a value slightly above an inconvenient one, so that an intermittent operation of the pump 2 can be obtained within a preferable range of temperature. A thermostat 10 is arranged on the discharge side of the pump 2 for switching ON when the current water temperature drops under the preferable range to a prescribed degree, and switching OFF similarly when the current water temperature rises over the preferable range. As a result of the intermittent operation within the preferable range of temperature, energy saving and decrease in water leakage due to erosion can be expected.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a hot water circulation device in a central hot water supply system.

``Conventional technology'' A hot water circulation system in a conventional central water heating system consists of a hot water supply pipe and a return pipe arranged through a circulation pump between the hot water storage tank and the faucet on each floor to form a circulation path. , the hot water is constantly circulated to ensure the temperature of the hot water used at all times.

``Problem to be Solved by the Invention'' In the conventional technology, the above-mentioned circulation pump is constantly operated, which increases power consumption and is contrary to energy conservation. Furthermore, due to constant operation, water leakage occurs in the piping due to erosion.

The present invention has been made in view of the problems of the conventional technology, and its purpose is to provide a hot water circulation device that can save energy and reduce erosion. It is something.

``Means for Solving the Problems j'' In order to achieve the above object, the hot water circulation device of the present invention has a circulating pump set to a timer set at a time that will not cause the temperature of hot water on the discharge side of the pump to drop to an inconvenient level. It is assumed that the connection is made.

Alternatively, connect the thermostat set to the appropriate hot water temperature installed after the final hot water tap branch in the circulation system and turn it on.
, OFF control is performed. Alternatively, the circulation pump is connected to a thermostat installed on the discharge side of the pump that sets the ON operation to an appropriate hot water temperature and a timer set to a predetermined time, and the thermostat controls the ON operation and the timer controls the OFF operation.

In either case, operating the circulation pump only prevents the temperature of the hot water in the circulation pipes from decreasing, so once the temperature of the hot water in the pipes rises, there is no need to operate it until the temperature drops. Since there is no such system, intermittent operation will be performed.

``Effect'' The circulation pump is operated by a timer or thermostat.
N, OFF control allows intermittent operation within a range where the temperature of hot water in the circulation pipe does not drop undesirably. As a result, energy savings can be expected and the occurrence of water leakage due to erosion is reduced.

"Example" Examples will be described with reference to the drawings.

In Figure 1, a circulation pump 2 is connected to the top of a hot water storage tank 1.
On the discharge side of each floor, there is a hot water supply pipe 4 between the faucets 3, . A pipe 5 is arranged to constitute a circulation path.

Note that the hot water storage tank 1 in the illustrated example has a built-in heat source 6.

The piping 8 which connects the circulation pump 2 from the upper part of the hot water storage tank 1 mentioned above is branched and connected to the upper part of the expansion tank 7, and the lower part of the expansion tank 7 is connected to the lower part of the hot water storage tank 1 via a pipe 13. Connect and secure water head pressure respectively.

Water supply is ensured. Regarding this kind of equipment,
It is always kept.

A timer 9 is connected to the circulation pump 2, and the timer 9 determines in advance the time from when the hot water temperature on the discharge side of the circulation pump 2 reaches a suitable temperature until just before it drops to an undesirable temperature. Calculated and set to this time.

Accordingly, in the first aspect, intermittent operation is ensured within a suitable hot water temperature range.

The thermostuff) 10 is disposed at an appropriate position on the discharge side of the circulation pump 2, and turns off when the hot water temperature drops to a certain degree from the appropriate hot water temperature, that is, a suitable hot water temperature, and turns off when the hot water temperature rises to a certain degree.

Therefore, even in the second aspect of the invention, intermittent operation is ensured within a suitable hot water temperature range.

According to a third aspect of the present invention, the thermostat 10 is provided with a function that only turns on the thermostat when the hot water temperature drops to a certain degree below a suitable temperature. In this case, the thermostat 10 is turned ON and the timer 9 is turned OFF to ensure intermittent operation within a suitable hot water temperature range.

In addition, 11. . . . indicates a gate valve, and 12 indicates a check valve.

"Effects of the Invention j Since the present invention is configured as described above, it produces the following effects.

As a result of ensuring intermittent operation within a suitable hot water temperature range, it is possible to save energy and reduce water leakage due to erosion.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the apparatus of the present invention. 1...Hot water tank, 2 4...Hot water pipe, 7... Expansion tank, 10...Thermostough Stop valve, 13...pipe. ...circulation pump, 5... Hot water return pipe, 8... Piping, G, 11...game 3...faucet, 6...Heat source, 9...Timer, To valve, 12...reverse

Claims (3)

[Claims] (1) A hot water circulation system in a central hot water supply system in which the circulation pump is connected to a timer set at a time when there is no risk of the hot water temperature at all hot water faucet branches dropping to an inconvenient level, and the pump is controlled to turn on and off. . (2) A hot water circulation device in a central hot water supply system, in which a thermostat set at an appropriate hot water temperature is connected after the final hot water tap branch in the circulation system, and a circulation pump is turned on and off based on the output of the thermostat. (3) Connect the ON operation installed after the final hot water tap branch in the circulation system to a thermostat set to the appropriate hot water temperature and a timer set at a predetermined time, and turn the circulation pump ON with the thermostat and OFF with the timer. A hot water circulation device in a central hot water system that is controlled.