JPS6131815A - Gas flow rate control device - Google Patents

Abstract

PURPOSE:To obtain a correct flow rate of gas corresponding to a temperature of a load liquid by providing a coil spring, comprising a shape memory alloy in a passage of the load liquid. CONSTITUTION:The coil spring 5, comprising the shape memory alloy, energizes a gas flow rate control valve 4 toward the left through a spindle 12, is provided in the passage of water which is a load fluid. A spring 13 is energized reversely with respect to the coil spring 5. Detecting by a flowing water detector, a water pressure response valve 9 is opened, consequently, gas reaches a burner 10 through the gas volume control valve 4 and is ignited. In summer-time, an incomming water temperature becomes high, which causes to change the shape of the memory alloy constituting the coil spring 5 due to the reason that the pressure of coil spring 5 overcomes that of spring 13 being energized, thereby the gas flow rate control valve 4 is moved to the left side and gas flow rate is reduced. On the other hand, in winter-time, the gas flow rate control valve is moved to the right side and gas flow rate is increased. Thus, regardless of the variable water temperature change in the four seasons, the constant hot water temperature in an exit may be always obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Utilization Minute Meter) The present invention relates to a gas amount control device, and more specifically, to a gas amount control device that controls the gas amount according to the temperature of the load fluid in order to maintain the load fluid at a set temperature. related to things.

(Prior art) Conventionally, as disclosed in Japanese Utility Model Application Publication No. 55-168155, this i-position has a temperature detecting section provided inside the load fluid flow path and a thermal response sensor provided outside the load fluid flow path. The gas flow control valve was operated by the body.

(Problems to be Solved by the Invention) For this reason, there is a problem in that the thermally responsive body is affected by the external temperature, and the gas flow rate control valve cannot necessarily operate accurately in accordance with the temperature of the load fluid.

(Means for Solving the Problems) The present invention aims to eliminate such inconveniences.
) via a thermally responsive body (3) that responds to the gas flow control valve (4).
), the temperature detection unit (2)
The thermally responsive body (
3), and the coil spring (5) is provided within the flow path (1) for the load fluid.

(Example) Fig. 1 shows the device of the present invention applied to a water heater, in which a flow path (1) of water, which is a load fluid, is equipped with a flowing water detector (6) and a temperature detector integrally formed with a water governor. Part (2)・Water flow regulator (7
) and a heat exchanger (8). On the other hand, gas passage (11)
A water pressure responsive valve (9) interlocked with the flowing water detector (6) and a gas amount control valve (4) responsive to the temperature detected by the temperature detecting section (2) were provided.

In FIG. 2, (5) is a coil spring made of a shape memory alloy, which biases the gas amount control valve (4) to the left (in the direction of restricting the gas amount) in the drawing via the spindle V (12).
It was provided in the flow path (1) for water, which is a negative fluid. (13) is a spring that is biased in the opposite direction to the coil spring (5). (4) is a needle-type gas volume control valve, which reduces the gas volume by moving to the left in the drawing. Although the gas amount control valve (5) is constructed as a needle type, it is not limited to this and may be a gas governor. Furthermore, spindle (12'), spring (13), fill spring (5)
) may be constructed as one unit and separated from the gas amount control valve (5).

(Function) When the water flow is detected by the water flow detector (6), the water pressure response valve (9) is activated.
is opened, gas reaches the burner (10) via the gas amount control valve (4), and is ignited by a well-known ignition method.

When the amount of water is increased by the water amount regulator (7), the hot water temperature decreases, and when the amount of water is decreased, the hot water temperature increases.

However, because the inlet water temperature changes with the changing seasons, the outlet temperature will change even with the same amount of water. In the summer, the temperature of the incoming water is high, so the coil spring (5) made of a shape memory alloy provided in the flow path (1) changes its shape against the biasing force of the spring, causing the gas flow control valve (4) to change its shape. By moving to the left in FIG. 2, the amount of gas decreases.

On the other hand, in winter, the inlet water temperature is low, so the shape of the coil spring (5) changes and the biasing force of the spring (13) moves the gas volume control valve (4) to the right in Figure 2, increasing the gas volume. vinegar. In this way, a constant hot water temperature can be obtained regardless of seasonal changes in water temperature.

(Effects of the Invention) As described above, according to the present invention, the gas amount control valve (4) ),
The detection part (2) is made of a shape memory alloy.
) is formed integrally with the thermally responsive body (3), which reduces the number of parts and simplifies the configuration.

Since the coil spring (5), in which the temperature detection part (2) and the thermally responsive body (3) are integrally formed, is provided in the flow path (1) of the load fluid, it is less expensive than the conventional type described above. This has the effect that the thermally responsive body is not affected by the temperature of anything other than the load fluid, allowing accurate operation of the gas amount control valve (4).

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a running water heater to which the device of the present invention is applied;
The figure is an enlarged sectional view of the main part of the device of the present invention. (1)...Flow path (2)...Temperature detection section (3
)...Thermal response body (4)...Gas amount control valve (5)
・・・Coil spring

Claims (1)

[Claims] In a type in which the gas flow control valve is actuated via a thermally responsive body that responds to a temperature detecting section provided in the flow path of the load fluid, the temperature detecting section is integrated with the thermally responsive body using a coil spring made of a shape memory alloy. 1. A gas amount control device characterized in that the coil spring is provided in a flow path of a load fluid.