JPS5812947A - Water controller - Google Patents

Abstract

PURPOSE:To miniaturize a water quantity variable operating part and reduce the manipulation strength by providing an adjusting valve whose opening degree is changed by the pressure difference between both chambers, in a first communication path of the communication paths connecting a primary chamber and a secondary chamber to each other which are partitioned by a diaphragm. CONSTITUTION:The primary chamber 5 and the secondary chamber 14 which are partitioned by a diaphragm 6 are provided, and water passes from an inlet path 2 through a valve chest 3 and reaches the primary chamber 5 via a control hole 4 having a valve 7. Further, water passes from the primary chamber 5 through a differential pressure generating part 11 consisting of a differential pressure hole 8, a differential pressure valve 9 and a differential pressure spring 10 and reaches the secondary chamber 14 via an outlet path 12 and a secondary communication path 17 including an adjusting valve 18. On the other hand, the primary chamber 5 and the secondary chamber 14 are communicated with each other by means of the secondary communication path 17. By adjusting an adjusting valve 18 by means of an adjusting shaft 20, the quantity of water is set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water amount variable means for a water control device used for the purpose of detecting and controlling the amount of water in instantaneous water heaters that use gas or oil. Water governors are well known in which a pressure difference that has a certain relationship with the amount of water flowing is applied to a diaphragm, and a valve that operates in conjunction with the diaphragm stabilizes the amount of water even if the supplied water pressure changes. When changing the water amount value, the relationship between the water amount and the differential pressure is changed by changing the fineness of the throttle valve provided in the water passage, and the water amount value at which the water governor is stabilized is changed. When changing the water flow value using this method, it is difficult to make the diameter of the throttle valve installed in the water passageway too small due to water flow resistance, and there is a limit to overall miniaturization and reduction of operating force. . Further, when water flow is detected by detecting the operation of the diaphragm of the water governor, there is a problem in that the detectable minimum water amount value changes depending on the opening degree of the throttle valve.

In the present invention, the diaphragm differential pressure is indirectly changed as the water amount variable means, and the relationship between the water amount and the differential pressure is changed only in the region above a certain water amount value, which allows for miniaturization of the water class variable operation section and reduction in operating force. The purpose is to reduce the amount of water that can be detected and stabilize the amount of water that can be detected.

Hereinafter, a detailed explanation will be given based on the embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the present invention, in which 1 is a main water control device, and water enters a valve chamber 3 from an inflow path 2, passes through a control hole 4, and enters a fire chamber 6. Arrive. - In the upper part of the firebox 6 is a diaphragm 6, and the diaphragm 6 and the valve 7 are supported in an interlocking manner. The valve 7 plays a role of varying the water flow area of the control hole 40. Next, water passes from the first fire chamber 6 through a differential pressure generating section 11 composed of a differential pressure hole 8, a differential pressure valve 9, and a differential pressure spring 1o, and reaches a heat exchanger (not shown) through an outflow path 12. The differential pressure valve 9 is biased in the direction of closing the differential pressure hole 8 by the differential pressure spring 10, and when the force due to the pressure difference of the water passing through the hole 13 exceeds the force of the differential pressure spring 1o, the differential pressure at the differential pressure hole 8 closes. Operates to increase the passing area.

The back side of the diaphragm 6 is a secondary chamber 14 which houses a diaphragm spring 15 and is always pressed toward the bill 5 side. 16 is a first communication passage connecting the primary fire chamber 5 and the secondary chamber 14, while 17 is a second communication passage connecting the secondary chamber 14 and the differential pressure generating section 11. And the first series of passages 1
A control valve 18 is inserted in the middle of 6, and a spring 19 is acting to suppress and bias this control valve 18 from the second firebox 14 side to the first firebox 5 side, and the other end of the spring 19 is It is supported by an adjustment shaft 2o. Sunawa Chi--Firebox 6
The control valve 18 opens and the first communication passage 16 opens only when the pressure in the secondary chamber 14 exceeds the pressure in the secondary chamber 14 by an amount equivalent to the force of the spring 19.

The adjustment shaft 2o may be rotated by hand, but there is also a method in which it is rotated by a drive mechanism composed of a motor 21 and a reduction gear 22. Also, the vertical movement of the diaphragm 6 is taken out to the outside by the pin 23, and the detection switch 241''#36・``'65・
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When the value exceeds a certain value and the diamond 7 ram ring 16 has been overcome and the water has moved a set distance, the switch 24- is switched to detect that water has flowed.

Next, the present invention will be explained in detail with reference to the water amount-differential pressure curve shown in FIG. This figure shows the relationship between the water flow rate and the pressure difference between the primary fire chamber 5 and the secondary chamber 14 acting on the diaphragm 6. Here, the curve A shown by the broken line is the net pressure difference generated by the action of the differential pressure generating section 11. As mentioned above, when the amount of water is small, a pressure difference determined by hole 13 is generated,
Since the differential pressure acts in the direction of pushing the differential pressure valve 9 open, the increasing tendency of the differential pressure slows down above a certain amount of water. Next, when the adjustment shaft 2o is tightened to maximize the set load of the spring 19, the adjustment valve 18 will not open and will show an 8 curve along curve A, which is equivalent to the case without the first continuous passage 16. It turns out. By the way, the diaphragm 6 moves in the direction in which the valve 7 closes the control hole 4 in response to the differential pressure, so a stable state is reached at a certain differential pressure value determined by the diaphragm area and the load of the diaphragm spring 16. Even if the supply water pressure is increased, the amount of water will not increase. In curve B, water amount Q1. This point is the differential pressure ΔP1.

Next, when the adjustment shaft 2o is loosened, the load on the spring 19 is reduced. However, while the differential pressure is small, the force acting on the control valve 18 is weak, so the water amount-differential pressure characteristic matches curve B. When the water amount increases and the differential pressure reaches ΔP'2, the control valve 18
overcomes the force of spring 19 and begins to open little by little.

As a result, the pressure in the secondary chamber 14 is influenced by both the pressure in the firebox 6 and the pressure in the differential pressure generating section 11. The degree of influence is determined by the degree of opening of the control valve 18, and when the degree of opening is small, the pressure is close to the pressure of the differential pressure generating section 11, and when the degree of opening is large, the pressure is close to the pressure of the first fire chamber 6. This means that the pressure in the secondary chamber 14 is determined by dividing the differential pressure generated in the differential pressure generating section 11 depending on the ratio of the water flow resistances of the first communication passage 16 and the second communication passage 17. Therefore, when the control valve 18 starts to open, the secondary chamber 14 is influenced by the first fire chamber 6, and the tendency of the differential pressure to increase becomes slower. This is shown by curve C. In this case as well, there is a stable point at which the water volume does not increase above a value that produces a certain differential pressure. Since the water flow value is larger than in the case of curve B, the gap formed by the valve 6 and the control hole 4 is stabilized in a wide state, resulting in a value smaller than the differential pressure ΔP2IfiΔP1 at the stable point.

Similarly, when the adjustment shaft 20 is further loosened to lower the set load of the spring 19, a curved line is formed and a stable state is reached at the water amount Q3.

As described above, by changing the setting point of the control valve 18 in the first communication passage 16, the total amount of water flowing in and out can be completely varied.

Now, as the differential pressure increases, the diamond 7 ram 6 rises, but the distance it moves is determined by the diaphragm spring 15 and the differential pressure. Therefore, under a constant diaphragm spring, the moving distance is determined by the differential pressure value, and the minimum required differential pressure necessary to operate the detection switch 24 is also determined. In FIG. 2, the differential pressure is shown as ΔPs, and a switch signal is obtained above this differential pressure. If the setting is made so that the Fi control valve 18 will not open with a pressure difference of ΔP5 within the operating range of the control shaft 20, the pressure difference of ΔIl/2 will be maintained on both curve C and curve.
□, below ΔP'3, it matches curve B.

Therefore, set the water amount to 01. Q2. Even if you change it like Q3, the minimum detectable water amount will remain constant at 03.

Note that the same effect can be obtained even if the differential pressure generating section 11 is replaced with a normal venturi or orifice. However, the curve is not a saturation curve as shown in FIG. 2, but a square curve.

As described above, according to the present invention, since the main water flow rate can be controlled by a small closed control valve, it is possible to downsize the entire device and it is advantageous in reducing the operating torque. In particular, when driving with the power of a motor or the like as shown in the figure, it brings about ripple effects such as the ability to reduce the capacity of the motor and drive power supply circuit. Further, the fact that the detectable water amount does not change even if the water amount value is changed improves usability when applied to an instantaneous water heater.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the configuration of an embodiment of the present invention, and FIG. 2 is a water flow-differential pressure characteristic diagram in the embodiment of FIG. 6900. , ll-ya, sea urchin, 50. -1-fi mio, 4!゛...Secondary room, 4...
Control hole, 2...Inflow path, 7゛...Valve,
16...First communication passage, 11...Differential pressure generating section, 12...Outflow passage, 17...Second communication passage, 18...・Control valve, 19...Spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 β

Claims (3)

[Claims] (1) A diaphragm, a primary chamber and a secondary chamber divided by a diaphragm, an inflow path that reaches the primary chamber via a control hole, a valve that controls the opening degree of the control hole in conjunction with the diaphragm, and - It has an outflow path that flows out from the chamber via the differential pressure generating section, a first communicating path connecting the secondary chamber and the secondary chamber, and a second communicating path connecting the differential pressure generating section and the secondary chamber, and A water control device characterized in that the communication path is provided with a control valve whose opening degree changes depending on the pressure difference. (2) The control valve is characterized in that it remains closed when the pressure difference between the primary chamber and the secondary chamber is below a set value, and when the pressure difference exceeds the set value, the opening degree increases in accordance with the pressure difference. A water control device according to claim 1. (3) The control valve has a spring that opposes the force caused by the pressure difference, and the set load of the spring can be changed. Control device.