JPS58145842A - Controller of hot water feeder - Google Patents

Abstract

PURPOSE:To prevent the lowering of the temperature of service hot water in low temperature seasons by a method wherein the quantity of supply water is controlled in proportion to the temperature at the inlet port or the outlet port of a heat exchanger. CONSTITUTION:A valve seat port 13 is provided at the inlet port of a water circuit A equipped with the heat exchanger 2 heated by the burner 3 and a throttle valve 12 is arranged opposite the valve seat port 13. The throttle valve 12 is linked to a reversible disk-like bimetal 11 having an upper surface of a suitable radius of curvature and is provided with a throughhole 14 so that when the temperature of the supply water lowers below a predetermined value, the valve seat port 13 is closed to reduce the quantity of the supply water so that the temperature of the service hot water is prevented from lowering.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a flash heating type water heater such as a gas water heater, and particularly to a control device for obtaining a hot water outlet temperature corresponding to a set hot water temperature by exactly 711 gK.

As this type of control device, one shown in FIG. 1 is already known. This device includes a detector (1) for detecting the hot water temperature in the hot water circuit on the outlet side, and a proportional control valve (4) inserted into the gas circuit to the main burner (3) that heats the heat exchanger (2).
) and a hot water temperature setting circuit (5) for setting a predetermined hot water temperature.
The table shows a hot water temperature detection circuit (6) that converts the output from the detected heat (1) into an electrical signal, and compares the output of the hot water temperature detection circuit with the output of the temperature setting circuit (5) and takes measures to deal with the difference. The comparator circuit (8) inputs the output signal into the actuation circuit (7) of the proportional control valve.

In this device, a comparator circuit (8) compares the electrical signal values of the appropriately set hot water temperature and the outlet hot water temperature.
An output corresponding to the difference is inputted from the comparison circuit to the operating circuit (7), and the proportional control valve (4) inserted into the gas circuit is operated according to the input value from the operating circuit, and the heat exchanger ( 2)
The amount of gas changes in response to changes in the flow of the hot water circuit through the hot water circuit. Therefore, when there is a large amount of used fJJJII, the amount of combustion gas in the main burner (3) is suppressed, and a hot water outlet temperature matching the set hot water temperature can be obtained regardless of the amount of hot water used or fluctuations in water pressure.

However, the temperature of the tap water etc. introduced into the hot water circuit changes significantly throughout the year (approximately 0°C to 20°C), and on the other hand, the maximum amount of combustion gas in the main burner depends on the size of the combustion chamber, the combustibility , from the viewpoint of economic efficiency, is fixed to a certain level. Therefore, during the low-temperature period of winter, the amount of combustion gas in the main burner (3) may reach a level corresponding to the output value from the comparator circuit (8), and the outlet temperature may be extremely lower than the set hot water temperature. It may happen.

The present invention has been made in view of this point, and it is possible to control the amount of water supplied to the hot water circuit under the most severe conditions, that is, during low temperature periods, so that the temperature of hot water does not drop extremely. The purpose is to do so.

A technical means for solving the above problem is to insert a temperature-sensitive actuator into the inlet or outlet of a water circuit including a heat exchanger in an instantaneous heating type water heater, and to adjust the temperature according to the output of the actuator. A restriction device such as a throttle valve that restricts the amount of water flowing into the water circuit is inserted upstream of the main hot water faucet in the water circuit, and the temperature at the inlet or outlet side of the water circuit is below a certain value. The operating temperature of the temperature-sensitive actuator is appropriately set so that the throttle device operates in a temperature range.

According to the above technical means, when the temperature on the inlet side or the outlet side to the water circuit is extremely low, that is, in this case, the capacity of the main burner is at its limit, and the heat is exchanged at a predetermined set water temperature. In this case, the temperature-sensitive actuator detects this and operates, and the throttle valve that works in conjunction with the temperature-sensitive actuator throttles the flow rate of the water circuit through the heat exchanger to an appropriate amount. As a result, extremely low-temperature water will not come out of the hot water faucet. Therefore, even when the above-mentioned conventional proportional control valve is combined, the amount of gas combustion is controlled under the small flow rate condition in this water circuit, and the hot water temperature and the set hot water temperature match. That will happen.

Since the present invention has the above configuration, it has the following unique effects.

There is no connection with electric or manual hot water temperature setting devices, and it is inserted separately from these devices, so the hot water temperature can be adjusted from the slave side instead of using a water heater using an electric proportional control valve. It has the advantage that it can be used as is for all types of instantaneous hot water supply, such as candy tickets using the setting device (I-).

Hereinafter, embodiments of the present invention will be explained based on the drawings.

The first example shown in Fig. 2 has a temperature-sensitive actuator,
Disc) ζ imagecle dll (!- Adopt the disc) ゞImicle is suitably bent into a spherical surface with a square root, and this or this is set 5LMt
Insert the disc so that it is reversed below i, insert the disc into the inlet side of the water circuit (A+), and insert the throttle valve 0, which is linked to this, into the inlet side of the water circuit (5). In this device, the high expansion side of the Nomaimetal is located on the convex side of the disc bimetal (11) in the regular Ayu, and when the temperature drops below the set temperature, the disc is inserted. Invert the disk and connect the throttle valve (1
2I closes a valve seat opening t131 provided opposite the throttle valve to suppress the amount of water flowing into the water circuit (A) to a certain level or less.

The inflow water at this time'lf! : corresponds to the opening area of the through hole provided in the throttle valve IZ (141), and even if the hot water faucet is fully opened, only the amount of water throttled by the throttle valve ubK will reach the heat exchanger ( 2).

Therefore, even if the tap water temperature is extremely low, the main burner is prevented from running out of capacity, and low-temperature hot water is supplied to the hot water faucet 05.
) will eliminate the inconvenience of leakage.

Next, in the second example of loss shown in Fig. 3, a cantilever-type par-shaped bimetal Qυ is used as a temperature-sensitive actuator, and this is inserted into the outlet side of the water circuit (3). Connect the shaft of the throttle valve O2 to the free end of the bimetal, and as the bimetal (21+) bends as the temperature drops, the crest valve (Iz is the valve seat opening) inserted into the inlet side of the water circuit (A). When the temperature is lower than the set temperature, the throttle valve (2) is located within the tapered valve seat opening 031 and enters the flow throttling state. If the water temperature drops below, the bimetal 21
+ is further curved, and the throttle valve (12) is further bent into the valve seat opening (1
31 and proportionally increases the degree of aperture.

In this case, even if the temperature of the water flowing into the water circuit (8) further drops below the set temperature, the amount of throttling will be obtained in accordance with this water temperature.

In the illustrated embodiment, the bimetal (21+), that is, the temperature-sensitive actuator is connected to the hot water faucet α on the outlet side of the water circuit (5).
9, and on the other hand, the throttle valve 0zwo water circuit (5)
Although both are inserted into the inlet side as in the first embodiment, it is also possible to insert both into the inlet side as in the first embodiment, or vice versa. In addition, the first embodiment also has a disc bimetal (11) on the outlet side of the water circuit hole, similar to the second embodiment.
It goes without saying that it is possible to insert the valve α21 into the inlet side.

In other words, the temperature-sensitive operating heat and the throttle valve should be installed centrally at the inlet or outlet side of the water circuit, and if they are installed, the temperature sensor should be inserted at either the inlet or outlet side. ,
It is conceivable that a throttle valve interlocked with this may be inserted on the outlet side or inlet side opposite to the temperature-sensitive actuator.

Here, when inserting the temperature-sensitive actuator at the inlet side of the water circuit, the amount of hot water dispensed is 6.21°C at the temperature of approximately 45°C, which is normally usable, from the crotch during throttling operation or at the beginning of throttling operation. /
m was obtained. On the other hand, when inserting a temperature sensor on the outlet side, if the front left set temperature was set to 458CK, the same hot water temperature could be obtained with a similar device.

Next, the above 1. In the second embodiment, a bimetal is used as the temperature-sensitive actuator.
It is also possible to employ the temperature-sensitive actuator described in Publication No. 63.

Furthermore, as shown in FIG. 4, a bypass circuit 3]+ is provided in the water circuit with an appropriate throttling amount set in advance, and a solenoid valve C31+ is inserted into the main circuit parallel to this, and the solenoid valve C31+ is You may also try to shut down the .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is an explanatory diagram of the conventional example, and Fig. 2 is an explanatory diagram of the present invention.

Claims (1)

[Claims] In an instantaneous heating type water heater, a temperature-sensitive actuator is inserted at the inlet or outlet of a water circuit including a heat exchanger, and the amount of water flowing into the water circuit is throttled by the output KEf of the actuator. A throttling device such as a throttling valve is inserted into the water circuit upstream from the hot water faucet, and the throttling device operates in a temperature range where the temperature on the inlet side or the outlet side of the water circuit is below a certain value. A water heater control device that appropriately sets the operating temperature of the temperature-sensitive actuator.