JPS6141023Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flow rate adjustment device for an instantaneous water heater.

Conventionally, in this type of water heater, when adjusting the water temperature, it has been done using a temperature controller installed on the inlet pipe side that can change the amount of water, but since the inlet water temperature varies greatly depending on the season, the inlet water temperature In winter when the temperature is low,
Even if the maximum amount of hot water is burned, the hot water temperature decreases by the amount of water temperature that is low, making it impossible to obtain hot water at the high temperature set point.On the other hand, there are drawbacks such as the hot water becoming too hot in the summer when the hot water input is high. The amount of water input was changed depending on the season using a temperature controller, but the operation was cumbersome. In particular, in proportional control type water heaters that change the amount of gas in response to changes in the amount of hot water to always obtain a constant water temperature, the water supply flow rate is set to a constant value with a constant flow water governor, and within this set flow rate. The amount of governor can be varied according to changes in the amount of hot water used, but in the winter the hot water temperature will drop as described above, and in the summer the amount of combustion will be reduced by the amount of water that is higher than the set hot water temperature. Therefore, it had the disadvantage that it could not be used at full input, that is, it could not use an abundance of hot water that exceeded the flow rate set by the governor.

The present invention was developed with the aim of solving these conventional drawbacks, and is designed to automatically vary the set flow rate of the water governor according to the incoming water temperature. An example will be explained according to the drawings.

Reference numeral 1 denotes a burner for heating a heat exchanger 2 of a water heater, and its gas supply path 3 is provided with a proportional solenoid valve 4 for steplessly adjusting the amount of gas. The electromagnetic valve 4 compares and amplifies the difference between a heat-sensitive resistance element 6 provided in the hot water outlet path 5 for detecting hot water temperature and a resistance value set by a hot water temperature setting dial 7 provided on an operating remote control, etc., and generates a current flowing through an electromagnetic coil 8. This value is used to adjust the valve opening and change the gas amount. 9 is a constant flow water governor provided in the inlet channel 10;
a ring support 12 having a water passage hole 11 in the center fixed in a fixed position; an elastic ring 13 such as an O-ring fitted to the ring support 12 at the periphery of the water passage hole 11;
A flow rate regulator 14 disposed on the central axis of the water passage hole 11 and the elastic ring 13, a water temperature detection element 15 such as a wax thermometer facing the regulator 14, and the element 15.
It consists of a pressing spring 17, etc., which brings one end of the flow rate regulator 14 into constant contact with the tip of the movable shaft 16. The flow rate regulator 14 has a tapered shape that gradually becomes thinner toward the downstream side, and a water passage gap 19 is formed between the tapered surface 18 and the elastic ring 13 that deforms into a flat shape in response to water supply pressure to determine the flow rate. be done. Further, the adjusting body 14 is constantly in contact with a movable shaft 16 that protrudes and moves in and out in a balanced relationship with a pressing spring 17 as the fluid sealed inside the water temperature detection element 15 expands and contracts due to the temperature expansion and contraction of the fluid sealed inside the water temperature detection element 15. is adjusted.
Note that the water temperature detection element 15 may be replaced with a wax thermometer as in the embodiment, and a bellows or other element may be used.

In the above configuration, when the water supply pressure increases, the ring 13 is elastically deformed into a flat shape in response to the water pressure, and a part of the ring 13 largely protrudes inward to narrow the gap 19 with the flow rate regulator 14, thereby increasing the water supply pressure. Suppresses flow rate increase due to rise. When the water supply pressure decreases, the ring 13 approaches its original shape due to its elasticity, the gap 19 widens, and the area through which water passes increases. In this way, the ring 13 deforms depending on the water supply pressure, and when the water supply pressure is high, the gap 19 becomes small, and when the water supply pressure is low, the gap 19 becomes large, so that the passing flow rate is kept constant.

In the present invention, the position of the adjustment body 14 with respect to the elastic ring 13 is changed according to the water temperature by the water temperature detection element 15. Therefore, in the winter when the incoming water temperature is low, the movable shaft 16 is retracted, and the adjustment body 14
is pushed by the spring 17 so that the large diameter part of the tapered surface 18 faces the ring 13, so the gap 19 is narrowed and the amount of water flowing is suppressed, making it possible to dispense hot water at a high temperature. On the other hand, when the inlet water temperature is high in summer, the movable shaft 16 is extended, displacing the adjusting body 14 against the spring 17, and causing the small diameter part of the tapered surface 18 to face the ring 13, so the set flow rate increases and the water temperature decreases. You can lower it to prevent the water from getting too hot. Particularly in the case of the above-mentioned proportional control type water heater, the surplus combustion amount, which was previously limited, can be used to heat the increased flow rate, and a large amount of hot water can be supplied with full input.

Thus, according to the present invention, the elastic ring 13, the flow rate regulator 14, etc. constitute a simple constant flow water governor, and the water temperature detection element 15 is associated with the flow rate regulator 14, so the overall structure of the device is extremely simple. Therefore, there is an advantage that the excellent hot water temperature regulating effect as described above can be achieved with a small and inexpensive device.

[Brief explanation of drawings]

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 present invention, and Fig. 3 is a sectional view taken along line A-A in Fig. 2. . 9...Constant flow water governor, 11...Water hole, 12
...Ring support, 13...Elastic ring, 14...
...Flow rate regulator, 15...Water temperature detection element, 19...
Water passage gap.

Claims (1)

[Scope of utility model registration request] A water passage hole is provided in the center of the ring support, an elastic ring is fitted to the ring support around the periphery of the water passage hole, and a flow rate regulator is arranged on the central axis of the water passage hole and the elastic ring to supply water. A constant flow water governor is provided which adjusts the water passing gap between the ring and the flow rate regulating body by deforming an elastic ring according to water pressure to maintain a constant flow rate passing through the gap, and the flow rate regulating body is shaped into a tapered shape. What is claimed is: 1. A flow rate adjustment device for a water heater, characterized in that the flow rate is adjusted according to the water temperature by displacing an elastic ring using a water temperature detection element.