JPS6235574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an instantaneous water heater, and to a flow rate regulating device thereof.

For example, in recent years, a number of proportional control instantaneous water heaters have been developed that change the amount of gas in response to changes in the amount of hot water so that a constant water temperature is always obtained. The gas amount is set to a constant value using the governor, and the amount of gas can be varied according to changes in the amount of hot water used within this set flow rate, but in winter when the water temperature is low, even if the combustion is at the maximum amount, the hot water will not come out as much as the water temperature is low. The temperature dropped, and even when I set the hot water temperature setting dial to a high temperature, I couldn't get that hot water. In addition, in the summer, the amount of combustion is reduced by the amount of water that is higher than the set water temperature, so there is a drawback that it is not possible to use hot water at a higher flow rate than the set flow rate, that is, it cannot be used at full input.

The present invention was developed with the aim of solving these difficulties, and is designed to automatically vary the set flow rate of the water governor according to the incoming water temperature. explain.

1 is a burner that heats a heat exchanger 2 of a water heater, and its gas supply path 3 is provided with a proportional solenoid valve 4 that adjusts the amount of gas steplessly;
is a heat-sensitive resistance element 6 for detecting hot water temperature provided with a hot water outlet path 5.
A device that compares and amplifies the difference between the resistance value and the resistance value set by the hot water temperature setting dial 7 provided with an operation remote control, etc., changes the current value flowing through the electromagnetic coil 8, and thereby adjusts the valve opening degree and changes the gas amount. It is. Reference numeral 9 denotes a constant flow water governor provided in the inlet channel 10, which includes a governor valve body 11, a pressure receiving plate 12, a spring spring 13, a spring receiving plate 14, a water temperature detection element 15 provided opposite to the governor valve body 11, and these. Case 16 that can accommodate
Consists of etc. The case 16 has a valve chamber 17 for accommodating the valve body 11 on the upstream side, a secondary pressure chamber 18 on the downstream side, and a valve hole 19 is formed at the boundary between the two chambers 17 and 18. The water temperature detection element 15 consists of a wax thermometer, which is fixed to the outlet side of the secondary pressure chamber 18 with a support plate 20, and a spring receiving plate 14 is attached to an operating shaft 21 that moves forward and backward as the wax sealed inside expands and contracts. It's in contact. The spring receiving plate 14 and the pressure receiving plate 12 are connected to the chamber 1.
8, and a governor spring 13 is interposed between the two to bias the two against each other. The governor valve body 11 has a main valve part 22 on the front end side and a sub valve body 23 on the rear end side, each having a conical shape, and the main valve part 22 is the main valve of the case 16 forming the valve hole 19 The auxiliary valve parts 23 are made to face the auxiliary valve seats 25 formed approximately in the center of the valve chamber 17 of the case 16 on the seats 24, and the tips of the auxiliary valve parts 23 are brought into constant contact with the pressure receiving plate 12 by the pressure springs 26. 27 is a communication hole in which the main valve part 22 is provided, and the auxiliary valve chamber 28 and the secondary pressure chamber 18 pass through the center of the valve body.
communicate with. The main valve part 22 and the sub-valve part 23 are provided in a positional relationship such that they simultaneously approach and separate from the respective valve seats 24 and 25. 29 is a water inlet hole opened between the main and sub valve seats 24 and 25, and 30, 31, and 32 are pressure receiving plates 1
2. Water holes formed in the spring receiving plate 14 and the supporting plate 20, respectively. 33 is a hot water tap provided at the end of the hot water tap path 5.

In such a configuration, when hot water is supplied, if the amount of hot water changes by adjusting the tap 33, the element 6 detects the change in hot water temperature, the difference from the temperature set by the dial 7 is amplified, and the current flowing through the coil 8 is increased. By increasing or decreasing the valve opening, the amount of combustion changes and the water temperature is maintained at the set temperature. Furthermore, when the water supply pressure changes, the pressure receiving plate 12 moves to a position where this water supply pressure and the pressure of the governor spring 13 are balanced, and the valve element 11 moves in conjunction with the pressure, and the main valve part 22 advances and retreats into the valve hole 19. As a result, the opening degree of the valve hole 19 is adjusted and the pressure in the secondary pressure chamber 18 is kept constant.

However, in the conventional case where a water temperature detection element is not provided, the set flow rate of the water governor 9 is constant, so when the inlet water temperature is low in winter, even if combustion is performed at the maximum opening of the proportional solenoid valve 4, the outlet water temperature is equal to the inlet water temperature. The lower the temperature, the lower the temperature will be, and you will not be able to obtain high-temperature water. Conversely, when the incoming water temperature is high in the summer, even if dial 7 is set to the maximum water temperature, the flow rate at water governor section 9 is already fixed, so no matter how many times the hot water tap 33 is opened, for example, Also, the amount of combustion to obtain this maximum water temperature does not have to be 100%. In other words, in that case, you are using it with a combustion margin left, which means that you can increase the amount of hot water by that margin, but you are not doing so.
This method is unsatisfactory when a large amount of hot water is obtained in a short period of time.

Therefore, in the present invention, since the water temperature detection element 15 is provided and its operation is converted into the spring force of the governor spring 13, in the winter when the incoming water temperature is low,
The actuation shaft 21 is retracted and the force of the spring 13 against the pressure receiving plate 12 is weakened, so that the pressure receiving plate 12 is oriented at a position slightly shifted to the left in the figure, and the main valve portion 22 of the valve body 11 is moved by that amount. The valve hole 19 will be narrowed. Therefore, by suppressing the amount of water flowing through, it is possible to dispense hot water at the highest temperature. On the other hand, when the inlet water temperature is high, such as in summer, the operating shaft 21 extends and compresses the spring 13 via the spring receiving plate 14, so the set flow rate increases and the conventional surplus combustion amount is effectively used to heat this increased amount. , hot water can be supplied at maximum capacity, and the amount of hot water will be abundant.

Further, the flow rate control structure of the governor valve body is arbitrary, and as an example, FIG. 3 shows one in which opening and closing of the water inlet hole 36 is controlled by the side surface of the valve body 35. Furthermore, the water temperature detection element 15 may use a bellows or others.

Furthermore, it goes without saying that the present invention is not limited to proportional control water heaters, but can also be applied to conventional water heaters with constant combustion rate. Not only can it prevent the water temperature from dropping, but it can also prevent the water from becoming too hot in the summer.

As mentioned above, the present invention provides a valve chamber on the upstream side of the waterway,
A secondary pressure chamber is provided on the downstream side, and the secondary pressure chamber slidably accommodates a pressure receiving plate with a water passage hole and a spring receiving plate, and a governor spring is interposed between the pressure receiving plate and the spring receiving plate. The valve chamber is equipped with a valve body that follows the pressure receiving plate and adjusts the opening degree of the valve hole, and the operating shaft, which moves forward and backward according to the water temperature of the water temperature detection element, is in contact with the spring receiving plate, so that it can be easily used during winter, etc. This eliminates problems such as a drop in water temperature when the water temperature is low, and inconveniences such as not being able to achieve full combustion or the water temperature becoming too hot when the incoming water temperature is high, such as in the summer.Moreover, the governor spring has a water temperature detection element that responds to the water temperature. Since the actuating shaft that moves forward and backward is directly applied, the entire device can be made very compact and simple.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a proportional control type water heater which is an application example of the present invention, Fig. 2 is a sectional view showing an embodiment of the main part of the present invention, and Fig. 3 is another structure of the governor valve body. It is a partial sectional view showing an example. 9... Water governor, 13... Governor spring, 15...
...Water temperature detection element.

Claims (1)

[Claims] 1 It has a valve chamber on the upstream side of the waterway and a secondary pressure chamber on the downstream side, and the secondary pressure chamber slidably accommodates a pressure receiving plate with a water passage hole and a spring receiving plate, and the pressure receiving plate A governor spring is interposed between the spring receiving plate and the valve body, and a valve body is provided in the valve chamber to adjust the opening degree of the valve hole by following the pressure receiving plate, and the operating shaft that moves forward and backward according to the water temperature of the water temperature detection element is connected to the spring receiving plate. An instantaneous water heater characterized by being in contact with a plate.