JPH033797Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hydraulic response device mainly used in an instantaneous gas water heater.

(Prior Art) Conventionally, one side of a diaphragm is a high pressure chamber intervening in a water supply channel, and the other side is a low pressure chamber that communicates with a differential pressure forming part provided in a water supply channel downstream of the high pressure chamber via a conduction path. A hydraulic response device having a flow control valve connected to the diaphragm at the inlet of the high pressure chamber is known, for example, from Japanese Utility Model Publication No. 11325/1983.

(Problem that the invention seeks to solve) However, with this device, when the stop valve of an instantaneous water heater is suddenly closed, the stop valve provided on the upstream side of the high pressure chamber is suddenly closed. The water tries to continue flowing due to inertia, creating instantaneous negative pressure in the downstream water supply channel near the stop valve, or the water that was flowing earlier tries to return due to the negative pressure, creating high pressure. When a pressure fluctuation occurs in the water supply channel and the stop valve installed on the downstream side of the high pressure chamber is suddenly opened, the flow control valve connected to the diaphragm at the inlet of the high pressure chamber is suddenly closed and the Instantaneous negative pressure is generated in the water supply channel downstream of the valve, which also causes pressure fluctuations within the water supply channel. Along with these, so-called water hammer occurs.

Furthermore, when the stop valve of an instantaneous water heater that is equipped with a stop valve on the downstream side of the high pressure chamber is suddenly closed, the pressure rises rapidly on the upstream side of the stop valve, and as a result, pressure increases in the water supply channel. cause fluctuations. Further, when the stop valve provided upstream of the high pressure chamber is suddenly opened, a similar phenomenon occurs because when the stop valve is suddenly opened, the flow control valve linked to the diaphragm is suddenly closed. Pressure rises rapidly on the downstream side of the stop valve, and the resulting pressure fluctuations cause so-called water hammer.

The object of the present invention is to obtain a hydraulic response device free of such disadvantages.

(Means for Solving the Problems) In order to achieve the above object, the present invention has one side of the diaphragm 1 as a high pressure chamber 3 that intervenes in the water supply channel 2, and the other side of the diaphragm 1 on the downstream side of the high pressure chamber 3. water supply channel 2
A low pressure chamber 6 is configured to communicate with a differential pressure forming section 4 provided in the
In this case, the low pressure chamber 6 is provided with an air intake port 8 equipped with a check valve 7.

(Function) The operation will be explained for a type in which a stop valve 9 is provided in the water supply channel 2 on the upstream side of the high pressure chamber 3.

Now open the stop valve 9 and let water flow through the diaphragm 1.
moves to the left in response to the pressure difference acting on both sides, and this movement causes the flow control valve 10 to adjust the water pressure and also actuates the gas valve and other actuating members (not shown). Next, when the stop valve 9 is suddenly closed, a negative pressure is generated in the water supply channel on the downstream side of the stop valve 9 due to a sudden pressure drop, and the water that has flowed earlier tries to return due to the negative pressure. In the conventional type, water hammer occurs due to the pressure fluctuations that occur at this time.

However, according to the present invention, the check valve 7 opens due to the pressure drop in the low pressure chamber 6 due to the negative pressure, and air enters the low pressure chamber 6, causing air to be generated in the water supply waterway downstream of the stop valve 9. It is possible to prevent the sudden stoppage of water by slowing down the sudden pressure drop as much as possible, and also to prevent the above-mentioned increase in pressure in the water supply channel 2 due to the water trying to return. The increased air can absorb the increase in pressure in the water supply channel 2, thereby reducing pressure fluctuations occurring in the water supply channel downstream of the stop valve 9 and preventing water hammer as much as possible. I can do it. Further, when the stop valve 9 is suddenly opened and the flow control valve 10 is instantaneously closed, a negative pressure is generated on the downstream side, the same reaction occurs.

The air in the low pressure chamber 6 is gradually replaced by water supply, but each time the low pressure chamber 6 becomes negative pressure, the check valve 7 opens and the low pressure chamber 6 can be replenished with air. Air is therefore stored in the low pressure chamber 6.

(Example) The present invention will be explained with reference to a stop valve type instantaneous water heater shown in the drawings. In the drawing, 1 is a diaphragm, 3 is a high pressure chamber that intervenes in the water supply channel 2 formed on one side of the diaphragm 1, and 4 is provided in the water supply channel 2 on the downstream side of the high pressure chamber 3 formed on the other side of the diaphragm 1. 8 is an air intake port provided with a check valve 7 provided in the low pressure chamber 6; 10 is an inlet of the high pressure chamber 3; A flow control valve for adjusting the water supply pressure according to the operation of the diaphragm 1 provided in the diaphragm 1 is shown.
further includes an operating rod 11 protruding outside the low pressure chamber 6,
A gas valve (not shown) was connected to this and opened and closed according to the operation of the diaphragm 1.

In the drawing, 12 is a water heat exchanger provided downstream of the differential pressure forming part 4 of the water supply channel 2, and 13 is a gas burner that heats this, and the gas supply channel of the gas burner 13 is controlled by the gas valve (not shown). Control opening and closing.

Next, the operation of this device will be explained.

Now open the stop valve 9 and let water flow through the diaphragm 1.
moves to the left in response to the pressure difference acting on both sides, and this movement causes the flow control valve 10 to adjust the water pressure and also actuates the gas valve and other actuating members (not shown). Next, when the stop valve 9 is suddenly closed, a negative pressure is generated in the water supply channel on the downstream side of the stop valve 9 due to a sudden pressure drop, and the pressure inside the low pressure chamber 6 is reduced due to the negative pressure. When the check valve 7 opens and air enters the low pressure chamber 6, the rapid pressure drop occurring in the water supply channel downstream of the stop valve 9 is slowed down as much as possible to prevent sudden stoppage of the flow. At the same time, due to the increase in the pressure in the water supply channel 2 due to the above-mentioned water returning, the check valve 7
is closed, and air is sealed in the low pressure chamber 6, and at this time, the trapped air can absorb the increase in pressure in the water supply channel 2, thereby causing a rise in the pressure in the water supply channel downstream of the stop valve 9. Water hammer can be prevented as much as possible by reducing the pressure fluctuations that occur.

The air in the low pressure chamber 6 is gradually replaced by water supply, but each time the low pressure chamber 6 becomes negative pressure, the check valve 7 opens and the low pressure chamber 6 can be replenished with air. Air is therefore stored in the low pressure chamber 6.

In the above embodiment, an instantaneous water heater with a stop valve was explained, but it is not limited to this, and it goes without saying that it can also be applied to a stop valve. As the pressure suddenly decreases in the low pressure chamber, the check valve opens to let air into the low pressure chamber.

(Effect of the invention) As described above, according to the invention, one side of the diaphragm is used as a high pressure chamber intervening in the water supply waterway, and the other side is connected to the bench lily part provided in the water supply waterway downstream of the high pressure chamber and the conduction part. A low-pressure chamber communicating with the high-pressure chamber is provided with a flow control valve interlocked with the diaphragm at the inlet of the high-pressure chamber,
Since an air intake port equipped with a check valve is provided in the low pressure chamber, when a pressure drop occurs in the high pressure chamber, air flows in from the air intake port to reduce the pressure drop in the high pressure chamber side. It is possible to gradually reduce the flow and prevent sudden stoppage of the flow, and when an abnormal pressure rise occurs in the water supply waterway, the abnormal pressure rise that occurs in the water supply waterway can be absorbed by the accumulation of air in the low pressure chamber, and this can be prevented. Therefore, the occurrence of water hammer can be eliminated as much as possible, and the air in the low pressure chamber is gradually replaced by water when water is supplied. However, in the case of a stop valve, the stop valve must be closed or opened. When the stop valve is used, when the stop valve is opened, air is drawn into the low pressure chamber from the air intake port by the negative pressure generated in the low pressure chamber, and air is generated in the water supply channel. This has the effect of being able to always be prepared for abnormal pressure rises.

[Brief explanation of drawings]

The drawing is a partially cutaway side view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Diaphragm, 2... Water supply channel, 3... High pressure chamber, 4... Differential pressure formation part, 5... Conduction path, 6...
Low pressure chamber, 7... check valve, 8... air intake port.

Claims (1)

[Scope of utility model registration request] One side of the diaphragm is a high pressure chamber that intervenes in the water supply channel, and the other side is configured as a low pressure chamber that communicates with a differential pressure forming part provided in the water supply channel on the downstream side of the high pressure chamber via a conduction path. A hydraulic response device comprising a flow control valve interlocked with the diaphragm at the inlet of the high pressure chamber, and an air intake port equipped with a check valve in the low pressure chamber.