JPS59153057A - Hot water feeder - Google Patents

Abstract

PURPOSE:To prevent the generation of dead water (standing water) and to control an energy loss by a method wherein an auxiliary instantaneous water heater is arranged near a water cock at a position midway in an outlet pipe of a main instantaneous water heater and the supply of electric current to the auxiliary instantaneous water heater is controlled. CONSTITUTION:The auxiliary instantaneous water heater 3 is arranged near the supply water cock 4 of the outlet hot water supply pipe 2 of the main instantaneous water heater 1, the temperature of the hot water in the inlet pipe of the auxiliary instantaneous water heater 3 is detected by a detecting means 5 and the signal from the detecting means is inputted to a control circuit 6. Then the input signal from the detecting means 5 is compared to a variable hot water temperature setting signal 5a which is inputted separately to the control circuit and when the former is lower than the latter, the auxiliary instantaneous electrical water heater 3 is energized so that the low temperature hot water in the outlet pipe 2 is heated to a predetermined temperature and supplied from the supply water cock 4.

Description

[Detailed description of the invention] 2 pages Industrial applications The present invention relates to an instantaneous water heater.

Conventional configuration and its problems Conventional instantaneous hot water heaters open the faucet and allow low-temperature water to flow for a while because there is water stagnant in the piping connecting the hot water supply part and the faucet (hereinafter referred to as dead water). After flowing out, hot water at a predetermined temperature is supplied. Therefore, the user has to continue running water for a certain period of time after opening the faucet until the hot water flows out. Especially when using a water tap, the water that flows out when the faucet is opened causes discomfort and wastes dead water. there were.

As one means for solving these drawbacks, a configuration as shown in FIG. 1 has been conventionally adopted.

In FIG. 1, 1 is an instant water heater, 2 is a hot water supply pipe, and 3 is an electric water heater, which are arranged near a faucet 4. In this system configuration, the electric water heater 3 is connected to the faucet 40.
There is a nearby tank, and when the tap is opened, the hot water in the electric water heater 3 flows out. As a result, compared to a hot water system without an electric water heater 3, the discomfort caused by the outflow of dead water in the hot water supply pipe 2 is reduced by 3/3, but on the other hand, the electric water heater must be kept energized at all times. However, the power consumption increases, which is uneconomical.

Purpose of the Invention The present invention solves these conventional problems.
The purpose is to solve the discomfort caused by conventional dead water, minimize energy loss, and improve usability.

Arrangement of the Invention To achieve this objective, the present invention comprises a main instantaneous water heater;
A side water heater is connected to the outlet piping of this main instantaneous hot water heater and placed near the faucet, and the energization of the side water heater is controlled by the temperature of the water in the inlet piping of this side water heater. It consists of a circuit.

Figure 2 is a diagram of the principle of the present invention, where 1 is the main instantaneous water heater, 3
5 is a side water heater; 5 is a hot water temperature detection means for detecting the hot water temperature in the inlet piping of the side water heater 30; 5a is a variable hot water temperature setting signal;
and 6 are control circuits that control the water heater 3 in the side room.

In FIG. 2, the control circuit 6 constantly monitors the hot water temperature in the inlet piping by means of a hot water temperature detection means 5, and operates the side water heater 3 only when the hot water temperature in the hot water supply piping 2 is below the hot water temperature set value. control so that

Description of examples An embodiment of the present invention will be described below based on the drawings.

In FIG. 3, 11 is a gas instantaneous water heater as a main instantaneous water heater, 9 is a burner, 10 is an ignition detection sensor that detects the ignition of burner 9, 13 is an electric instantaneous water heater as a side water heater, 15 is a hot water temperature sensor in the inlet piping, 1sa is a variable hot water temperature setting means, 17 is a hot water temperature sensor in the outlet piping, 8 is a heater as an instantaneous heating means of the electric instant water heater 13,
16 is a control circuit for the side water heater 13.

2o is a hot water temperature control circuit of the main instantaneous hot water heater 11;
1 is a gas flow rate control valve, and 22 is a gas flow rate control signal.

23 is a hot water temperature sensor installed in the outlet piping section of the main instantaneous hot water heater 11.

FIG. 4 is an operation timing chart of the hot water supply system shown in FIG. 3.

Figure 4a shows the ignition detection signal of the gas instantaneous hot water heater 11, d' shows the change in hot water temperature at the outlet piping of the gas instantaneous hot water heater 11, b shows the change in hot water temperature in the inlet piping of the electric instantaneous hot water heater, and C shows the change in hot water temperature in the inlet piping of the electric instantaneous water heater. The change in hot water temperature in the outlet piping of the electric instantaneous hot water heater, d indicates the change in the power supplied to the heater 8.

In the above configuration, when the faucet 4 is opened, the gas instantaneous water heater 11
When the burner 9 is activated, the burner 9 is ignited and the signal from the ignition detection sensor 10 changes as shown in FIG. 4a.

Here, to indicates the ignition point.

In FIG. 4, To is the dead water temperature, T1 is the hot water temperature value set by the variable hot water temperature setting means 15a, and if heat loss in the piping is ignored, the hot water temperature change at each piping point is a', )), and C.

tl is the time when the hot water temperature in the inlet pipe of the electric instant water heater reaches T1', and the time (tl-10) depends on the length 2 of the hot water supply pipe.

When the control circuit 16 receives the signal from the ignition detection sensor 10,
The heater 8 is energized to start instantaneous heating operation. On the other hand, the water temperature in the outlet pipe of the water heater 13 is monitored by the water temperature sensor 17, and the control circuit 6/-ji path 16 turns on the heater power P using the set value T1 as a threshold value. , control off. Dead water in the hot water supply pipe 2 flows out, and the temperature of the hot water in the inlet pipe of the electric instantaneous water heater 13 rises, and at time t4, when the water temperature exceeds T1,
The control circuit 16 cuts off the heater power P, and the electric instant water heater 13 stops its heating operation. Figure 4C and d are
This situation is shown.

On the other hand, the outlet hot water temperature control circuit 20 inputs the detection signal of the hot water temperature sensor 23 installed at the outlet piping of the gas instantaneous water heater 11 and the set value by the variable hot water temperature setting means 15a, and outputs a gas flow rate control signal. By this, the gas flow control valve 21
control. As a result, the combustion amount of the gas instantaneous hot water heater is controlled, and the hot water temperature at the outlet piping section changes as shown in FIG. 4a'.

Effects of the Invention As described above, according to the present invention, by arranging a side water heater such as an electric instantaneous water heater near the faucet, the temperature of the water increases rapidly when the faucet is opened, thereby reducing the discomfort caused by dead water. but,
Minimized.

71-- When the temperature of the water in the inlet piping of the side room water heater exceeds the arbitrary set value, the heating operation of the side room water heater will be stopped and only the main instantaneous water heater will start operating automatically. As a result, the energy consumption of the instant hot water heater can be reduced.

Furthermore, the variable hot water temperature setting means allows any desired hot water setting of 1A to be set simultaneously for both the main instant hot water heater and the side water heater, so it can be expected to improve the comfort and ease of use when using hot water.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional water heater, and FIG. 2 is a diagram of the present hot water supply system. 1.11... Main instantaneous water heater, 3, 13... Side water heater, 5, 7, 15, 17.23... Hot water temperature sensor, 10... Ignition detection sensor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A side water heater connected to the outlet piping of the main instant water heater and equipped with variable hot water temperature setting means near the faucet,
A water heater that operates to stop the heating operation of the side room water heater when the temperature of hot water in the inlet piping of the side room water heater exceeds a set value. (2) The inlet piping section and the outlet piping section of the side room water heater are each equipped with a hot water temperature detection means and an instantaneous heating means for rapidly heating water, and the outlet piping is installed at the same time as the main instantaneous water heater is activated. a main instantaneous water heater; 2. The hot water supply apparatus according to claim 1, further comprising an outlet hot water temperature control circuit that controls the hot water temperature of the outlet piping portion to the set value.