JPS5817381B2 - instant water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention solves the problem of large water flow noise caused by excessive flow when equipment is used in areas with high water pressure. It is an object of the present invention to provide an instantaneous water heater having a water controller that does not generate water hammer sound during flow rate.

For devices with a water passage such as a stop-start gas instantaneous water heater,
If the inlet water pressure is high and the stop valve or stop faucet is opened all at once, the high pressure flow will directly flow through the governor chamber, into the diaphragm chamber, and in the case of a bypass system, flow from there to the heat exchanger. The water passes through the main water passage and the bypass passage that flows directly to the outlet without passing through the heat exchanger, and then merges near the outlet and reaches the hot water outlet.

The flow through the main water passage creates a pressure difference before and after the diaphragm, which activates the diaphragm.The governor actuator, which is installed to follow the movement of the diaphragm, also works at the same time, stabilizing the flow rate through the water passage. However, during this period from when the stop valve is opened until the governor operates normally, a flow rate that exceeds the predetermined flow rate will flow depending on the magnitude of the inlet water pressure, albeit for a short period of time.

Therefore, excessive current flows in each of the main water passage and bypass water passage, and this causes cavitation to occur in parts with high water flow resistance, such as parts of the venturi or flow rate adjustment part, which causes resonance in the heat exchanger, etc. This was causing a loud water flow noise.

On the other hand, when the bypass passage is fully closed (minimum flow rate) or close to it, it becomes almost the main passage only, and the governor actuator rises and the governor acts suddenly, causing sudden pressure on the downstream side. It caused a drop and a water hammer sound.

In this way, two types of water flow noises with different characteristics are generated due to the sudden opening of a water shutoff valve or the like when the water pressure is high.

The phenomenon is also the same in a series type waterway configuration that does not have a bypass passage, but in this type, the resistance at the throttle part cannot be made as large, so the water flow noise is lower than that in the bypass type. .

In any case, when the appliance starts to be used in a high water pressure area, water flow noise occurs, and if the instantaneous water heater has a first-stop structure, the water flow becomes particularly large, which has led to complaints.

This is what a conventional product looks like, but there are some that use a slightly modified venturi structure to reduce the occurrence of cavitation, but this reduces the water flow noise somewhat, but the water hammer noise that occurs at the lowest flow rate had no effect.

The present invention solves these conventional problems, and one embodiment thereof will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a main body, and a cap 2 is provided with a diaphragm 3 in between.The vertical movement of the diaphragm 3 is transmitted to the outside by a shaft 4, and is used to open and close gas valves and the like.

Water enters from the inflow part 5, passes through the water stop part 7 formed by the water stop valve 6 and the body 1, and reaches the governor chamber 8.

It passes through the governor part 10 formed by the governor 9 and the body valve seat part, enters the diaphragm high pressure chamber 11, further passes through the flow rate adjustment part 13 formed by the flow rate regulator 12 and the body 1,
After passing through the venturi part 14 which generates a pressure difference that drives the diaphragm 3, the water pipe 15 is connected to the heat exchanger 16.
go into.

The low pressure generated in the venturi section 14 is led to a low pressure chamber 17 on the back side of the diaphragm.

The hot water heated by the heat exchanger 16 passes through the hot water pipe 18, enters the body 1 again, passes through the outlet part 19, and enters the hot water outlet pipe 20.
Go outside.

In addition, in FIG. 1, from the diaphragm chamber 11 to the heat exchanger 16
In addition to the water passage entering the outlet 1 without passing through the heat exchanger 16
9, which shows a bypass waterway configuration having a bypass adjustment section 22 midway.

Further, 21 is a water faucet.

A pressure buffer device A shown in FIG. 2 is provided between the water vibrator 15 and the hot water pipe 18 near the entrance.

It is partitioned into a high pressure chamber 25 and a low pressure chamber 26 by a diaphragm 24, and is enclosed by an outer case 23.

27 is a low pressure chamber 26 in order to balance the force of the high pressure chamber 25.
It is a spring installed inside.

The above is the overall configuration, and the functions of each part are the same as those of conventional products, so detailed explanations are omitted, but they are as follows.

The water stop section 7 opens and closes the water by human operation, and the governor section 10 performs a governor function in conjunction with the operation of the diaphragm 3 to maintain a constant flow rate even when water pressure fluctuates. When it flows, it functions to open the gas valve.

Further, the flow rate adjustment units 13 and 22 are operated by humans to change the opening area and adjust the flow rate to obtain a desired temperature rise.

Further, the drain plug 21 is used to drain water after use of the equipment to prevent damage to the equipment due to freezing and expansion of residual water in cold regions.

Next, the operation related to the above embodiment will be explained.

The bypass regulator 22 in the bypass passage now is the flow regulator 1
2, when it is fully closed, that is, when only the heat exchanger passage is open, when the water stop valve 6 is opened with the water pressure at the inlet 5 at the standard pressure, water will flow into the main water passage. water is passed through, and the lift of the governor 9 begins, but until it reaches the governor action area, a flow rate that exceeds the predetermined flow rate flows through the governor section 10, and the governor 9 acts rapidly, causing the governor section 10 to A sudden pressure drop occurs on the downstream side, but since the pressure is low, both phenomena appear as only slight phenomena and are not a problem.

However, when the inlet water pressure becomes high, a large amount of water flows until the governor 9 throttles the governor part 10 at the initial stage of water flow, and the pressure difference generated at the venturi 14 increases, so the diaphragm 3 generates a large force and throttles the governor 9. The speed at which you move in that direction also increases.

Particularly in the case of a small flow rate setting where the bypass adjustment section 22 is closed, a slight change in the opening degree of the governor section 10 will greatly change the pressure drop value in this section. The moment the pressure reaches the region where the flow rate is suppressed, a sudden pressure drop occurs and a water hammer sound is generated.

In the present invention, the pressure buffer device A includes a water pipe 15 and a hot water pipe 1.
8, and when water is not flowing, the pressure on both sides of the diaphragm 24 is equal, so the diaphragm 24 is displaced by the spring 27 toward the high pressure chamber 25 side on the water pipe side.

At the beginning of water flow, when a large amount of water flows for the reason mentioned above, the diaphragm 24 compresses the spring 27 due to the pressure difference equivalent to the pressure drop in the heat exchanger 16, and is displaced toward the low pressure chamber 26.

When the opening of the governor section 10 rapidly narrows and a sudden pressure drop occurs, the water pipe 15
The pressure on the side is lower than on the side of the intestinal pipe 18, and the water pressure difference causes water hammer, but since both pipes are connected by the diaphragm 24, the water pressure difference is alleviated by a momentary movement of the diaphragm.

As a result, the momentary pressure difference between both ends of the heat exchanger 16, which causes a loud noise due to a rolling impact on the water hammer, is alleviated, and the noise is also reduced.

As described above, since the present invention has a structure in which pressure is propagated through the diaphragms in the pipes at both ends of the heat exchanger, it has the effect of alleviating the momentary pressure difference within the pipes, thereby reducing noise. .

Furthermore, even when the water is stopped, if the water is stopped rapidly, a momentary change in water pressure within the pipe system will cause water hammer, but even in this case, the diaphragm 24 is designed to equalize pressure at both ends of the heat exchanger 16 It plays the role of pressure propagation and is effective in reducing noise.

Moreover, since the pressure buffer device A has a configuration in which water pressure is applied to both sides of the diaphragm 24, it can be applied to both the original 1L device and the stop device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of the same pressure buffer device. 5... Inflow section, 10... Governor section, 1
1...Diaphragm high pressure chamber, 13...
Flow rate adjustment section, A... Pressure buffer device.

Claims (1)

[Claims] 1. Provide a water passage configuration from the water inflow section through the governor section, through the water pipe, and from the hot water pipe of the heat exchanger to the outlet, and a pressure buffer device having a diaphragm, a casing, and a spring that counters the force of the diaphragm, The instant water heater is configured such that the high pressure chamber side of the pressure buffer device communicates with the water pipe, and the low pressure chamber side communicates with the hot water pipe.