JPS6239763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a water governor that is capable of changing a flow rate setting value using the water pressure of water flowing through piping.

Generally, a water governor has a diaphragm disposed to be displaced in response to pressure in an inlet passage or an outlet passage, and a valve body supported by the diaphragm. The inlet passage and the outlet passage communicate with each other,
It is configured to adjust the water pressure and supply water.

The diaphragm is generally biased by a spring in the direction of opening the valve body, and the biasing force of this spring can be adjusted with an adjustment screw, and the set value of the water governor is adjusted by this adjustment screw. It was

However, changing the set value requires adjusting the adjustment screw each time, and it is difficult to perform the adjustment accurately.

This invention solves the above-mentioned drawbacks and uses the water pressure of the water flowing in the pipes to change the set value and supply an appropriate amount of water.For example, it can be applied to a water heater, and hot water at the set temperature can always be obtained. The purpose is to provide water governor.

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

Inside the housing 1, there is an inlet passage 2 through which water flows in the direction of arrow A, as shown in the longitudinal sectional view of FIG.
and an outlet passage 3 are formed, both passages communicating with each other at a port 4.

A first diaphragm 5 is disposed within the outlet passage 3 so as to receive the pressure within the outlet passage 3, and the first diaphragm 5 slides in the vertical direction via a rod 6 to open the port 4. It supports a valve body 7 that adjusts opening and closing. A spring 8 is inserted between the valve body 7 and the housing 1 as required, and presses the valve body 7 in a direction to close the port 4.

On the other hand, a second diaphragm 10 is attached above the housing 1 by a cylindrical connecting member 9, and a rod 11 of this second diaphragm 10
A pressure setting spring 15 is inserted between the diaphragm 5 and the first diaphragm 5 via an adjustment screw (primary adjustment section) 12 and spring receivers 13 and 14. Further, the inside of the connecting member 9 communicates with the outside through a ventilation hole 16 formed in the peripheral wall thereof.

The second diaphragm 10 communicates with a pipe 18 for introducing water pressure, which has one end communicating with the inlet passage 2 and the other end communicating with the outlet passage 3 via a three-pronged valve (pressure introduction adjustment part) 17 for introducing water pressure. are doing.

The three-pronged valve 17 is operated by an input signal from a control device (not shown), so that when a normal input signal is ON, the inlet passage 2 and the second diaphragm 10 are in communication with each other. is subjected to a water pressure P ₁ in the inlet passage 2. Conversely, when the input signal is OFF, the second diaphragm 10 is cut off from the inlet passage 2 and communicated with the outlet passage 3.
It receives the water pressure P ₁ in the outlet passage 3.

Note that the three-pronged valve 17 is not limited to an on/off valve, and a control valve may also be used. In this case, the second
Since the diaphragm 10 can gradually change the water pressure from _P1 in the inlet passage 2 to _P2 in the outlet passage 3, the water governor according to the present invention can change the set value steplessly.

and the rod 1 of the second diaphragm 10.
1 is in contact with the vertically movable piece 19 of the adjustment screw 12.

The adjustment screw 12 moves vertically by rotation, and the set value of the first diaphragm 5 can be changed via the spring 15 for pressure setting. However, the pressure setting by this adjustment screw 12 is primary, and once the pressure is set, it is fixed without reselecting the set value, and after that, the above-mentioned three-pronged valve 17 using water pressure is used. The set value is then changed.

Next, the operation of the water governor according to the present invention will be explained.

First, the adjustment screw 12 is rotated and moved up and down to press the first diaphragm 5 via the spring 15 to determine a predetermined setting value.

On the other hand, when the three-pronged valve 17 is in a normal state, the input signal of the control device is ON, and the inlet passage 2 and the second diagram 10 are in communication, the water pressure P in the inlet passage 2 is applied to the second diaphragm 10. ₁ and is transmitted to the first diaphragm 5 via the spring 15.

Then, in order to change the set value and supply the required amount of water at the appropriate time, the control device supplies an output signal to the three-pronged valve 17, and when the three-pronged valve 17 is turned off, the second diaphragm 10 is exit passage 3
Since it communicates with the water pressure P2 and receives water pressure _P2 , the set value can be changed in two stages.

Furthermore, if a control valve is used as the three-pronged valve 17 instead of an on/off valve, it will gradually turn off from the ON state.
The second diaphragm 11, to which the water pressure _P1 in the inlet passage 2 is applied, is set to a state in which the pressure is sequentially reduced by simply switching the state to the state shown in FIG.

Since the first diaphragm 5 is arranged to receive the water pressure in the outlet passage 3, the water pressure _P2 in the outlet passage 3, the primary set value by the adjustment screw 12, and the second The valve body 7 is located at a position where the three pressures of the water pressure (P ₁ to _{P 2} ) transmitted from the diaphragm 10 via the movable piece 19 and the spring 15 are balanced.
It operates to maintain the water level, and an appropriate amount of water is supplied.

FIG. 3 shows another embodiment of the valve 17 and the pipe 18 for introducing water pressure into the second diaphragm 10, in which the pipe 18a communicating with the inlet passage 2 and the pipe 18b communicating with the outlet passage 3 are respectively connected to the second diaphragm 10. This is an embodiment in which the pipe 18b is connected directly to the diaphragm 10, and a forked valve 17a is arranged in the pipe 18b.

The two-way valve 17a is also operated by an input signal from a control device (not shown), and in the ON state, the inlet passage 2 and the second diaphragm 10 communicate with each other, and the second diaphragm 10 is controlled by the water pressure P in the inlet passage 2. Receive ₁ . Conversely, in the OFF state, the second diaphragm 10 communicates with the inlet passage 2 and the outlet passage 3. Therefore, the second diaphragm 10 can reduce the pressure in the inlet passage 2 from the water pressure P ₁ in the ON state to the water pressure P ₂ in the OFF state, and can change the set value.

Here again, the forked valve 17a is not limited to an on/off valve, and if a control valve is used, the set value can be varied steplessly.

FIG. 3 shows another embodiment of the adjustment screw 12, in which a movable piece 19 is movably housed in a hole 20 in the adjustment screw 12, and a locking piece 21 restricts the movement range of its front end. .

As described above, according to the water governor of the present invention, after the primary pressure setting is set using the adjustment screw, the set value is changed using the second diaphragm using the water pressure of the water flowing inside the casing. However, it can supply an appropriate amount of water, and when applied to a water heater, for example, it exhibits extremely useful effects such as always providing the set temperature.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a water governor according to one embodiment of the present invention, FIG. 2 shows another embodiment of a valve and pipe for introducing water pressure, and FIG. 3 shows another embodiment of an adjusting screw. DESCRIPTION OF SYMBOLS 1... Casing, 2... Inlet passage, 3... Outlet passage, 5... First diaphragm, 7... Valve body, 8... Spring, 10... Second diaphragm, 12... Adjustment screw (primary adjustment part), 15 ...Spring for pressure setting, 17...Valve (pressure introduction adjustment part), 18...
A pipe for introducing pressure.

Claims (1)

[Scope of Claims] 1. A housing provided with an inlet passage and an outlet passage, a valve body that opens and closes the passage between the inlet passage and the outlet passage and adjusts the flow rate, and a valve body that supports the valve body and controls the pressure in the outlet passage. a first diaphragm arranged to receive the diaphragm; a primary adjustment section that presses the first diaphragm toward the outlet passage via a spring; and a pipe connected to the inlet passage and the outlet passage. and a second diaphragm having a pressure introduction adjustment section and pressing the first adjustment section. 2. The water governor according to claim 1, further comprising a spring that presses the valve body in a direction to open the opening between the inlet passage and the outlet passage.