JPS6222705Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a water flow rate control device for an instantaneous water heater or water dispenser.

Configuration of conventional example and its problems As shown in Fig. 1, the conventional water flow control device has the following features:
A water flow control valve 6 is housed in a water passage case 1 and fixed to a water inlet body 5 via a gasket 2. A flow rate switch 3 is provided on the downstream side thereof.
4 is a drain plug. The water flow control valve 6 has a water passage hole 6a.
and a water flow control valve rubber 6b that is actuated (deformed) by water pressure to change the water flow area and control the flow rate. In such a water flow control device, the pressure loss (resistance) of the water flow control valve 6 is large, so a sufficient flow rate cannot be obtained at low water pressure, so the water flow control valve has to be large in order to obtain a predetermined flow rate. . In addition, the gap in the water flow area of the water flow control valve is narrow, so even if the water inside the device is drained, water will not drain sufficiently, resulting in damage to the device in the winter, or water remaining on the surface of the water flow control valve, causing the surface to freeze. As a result, there were drawbacks such as the fact that it took time for the water on the surface of the water flow control valve to thaw before the next use, making it unusable.

Purpose of the invention The present invention solves the above-mentioned drawbacks of the conventional method.It allows a large flow rate to be obtained even at low water pressure, allows sufficient water to drain from the device, and allows immediate reuse after draining the water. The purpose is to

Structure of the Invention In order to achieve the above object, the water flow control device of the present invention includes a water flow part case having a flow channel, a water flow control valve provided movably in the axial direction in the water flow channel, and the water flow control valve. a spring biased in a direction opposite to the water flow direction; a bypass passage formed between the water flow channel and the water flow control valve and always open below a predetermined water flow rate; In this case, the water flow control valve is moved against the spring and comes into contact with the closing portion to close the bypass passage.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 2 and Fig. 4, 1 is a water flow control valve 2;
This is a water passage case in which a flow rate switch 3, a drain plug 4, and a water inlet body 5 are housed and attached. When the water flow control valve 2 is not flowing, the protrusion 5a of the water inlet body 5
In order to create a certain space (gap), and when the flow rate exceeds a predetermined level, the outer case 2a of the water flow control valve 2 is attached to the spring 6 at the blockage part 1a formed by the step formed in the water flow channel 8 of the water flow part case 1. They move in the axial direction against each other and come into contact with each other, thereby closing a bypass path 7, which will be described later.
In addition, the water flow control valve 2 has an outer case 2a and an inner case 2.
b. Consisting of a water flow control valve rubber 2c, the water flow control valve rubber 2c operates (deforms) in response to changes in flow rate to change the water flow area of the water flow holes 6a of the outer case 2a and inner case 2b, thereby adjusting the flow rate. The structure is such that a predetermined flow rate can be obtained through control.

A bypass passage 7 is formed between the water flow control valve 2 and the water passage case 1 by moving the water flow control valve 2 against the pressure of the spring 6 due to a change in flow rate.

The operation of the above configuration will be explained below. When a water stop valve (not shown) of a water heater or the like is opened, water entering from the water inlet body 5 is applied to the water flow part case 1 through the water flow control valve 2 against the spring 6 by water pressure. the bypass passage 7 formed between the water flow control valve 2 and the water flow section case 1 and the water flow hole 6 of the water flow control valve 2.
a, passes through the flow rate switch 3, passes through the water heater's heat exchanger (not shown), and flows from the water stop valve. The flow rate switch 3 is activated when the flow rate exceeds a predetermined value, and sends an ignition signal to activate the ignition operation of the water heater. Further, the water flow control valve 2 moves in the axial direction between the closing portion 1a and the projection 5a of the water passage case 1 as shown by arrow A in response to changes in the flow rate. That is, when the flow rate is below a predetermined flow rate, a bypass circuit 7 is formed, and when the flow rate exceeds a predetermined flow rate, the water flow control valve 2 hits the blocking part 1a and closes the bypass circuit 7, thereby controlling the bypass flow rate, and at the same time, the predetermined flow rate is maintained. The water flow control valve rubber 2c operates to control the flow rate so that the water flow does not occur. Moreover, when the water stop valve is closed, the force of pushing down the water flow control valve 2 against the pushing force of the spring 6 is lost due to the flow of water, so the water flow control valve 2 is pressed against the protrusion 5a of the water inlet 5 and bypass A passage 7 is formed.

The bypass circuit 7 is similarly formed when water is drained from the equipment to prevent freezing, so the water inside the equipment drains smoothly, so there is almost no residual water and there is no fear of freezing. Furthermore, even if there is residual water on the surface of the water flow control valve 2 and it freezes, the water flows through the bypass circuit and is thawed in a short time due to the water temperature, forming the original normal water passage.

In this way, according to this embodiment, a bypass circuit is formed when the water pressure is low and when water is drained, so it is easy to obtain a large flow rate even at low water pressure, the water draining performance of the equipment is improved, and there is no fear of freezing. have

Effects of the invention As described above, according to the invention, the following effects can be obtained.

(1) Pressure loss (resistance) of water flow control valve even at low water pressure
Since the influence of water can be reduced, a large flow rate can be obtained.

(2) Since the bypass circuit can be configured to be closed when water pressure is high, the water flow rate characteristics (flow rate changes due to water pressure fluctuations) are good due to the operation of the water flow control valve.

(3) When the water pressure is low, the influence of pressure loss of the water flow control valve is small, so the water passage and the water flow control valve can be made smaller.

(4) It is effective as a countermeasure against freezing because less water remains when draining water from the equipment.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional water flow control device, Fig. 2 is a sectional view of a water flow control device which is an embodiment of the present invention, Fig. 3 is a water pressure-water flow characteristic diagram of the same device and a conventional example, and Fig. 4 is a sectional view of a conventional water flow control device. The figure is a cross-sectional view of the water flow control device when draining water. 1...Water passage part case, 1a...Closing part, 2...
...flow control valve, 6...spring, 7...bypass passage.

Claims (1)

[Scope of utility model registration request] a water passage case having a water passage; a water flow control valve disposed in the water flow passage so as to be movable in the axial direction; a spring that biases the water flow control valve in a direction opposite to the water flow direction; A bypass passage is formed between the water flow control valves and is always open when the water flow is below a predetermined flow rate, and the water flow control valve, which is provided in the water flow path and moves against the spring when the water flow exceeds the predetermined flow rate, comes into contact with the bypass passage. A water flow control device for a water heater, comprising: a closing portion that closes the bypass passage.