JPS6131237Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a valve stem driven by a pressure difference caused by a change in flow velocity to cause an opening/closing valve displacement in each of the valve bodies provided in a passage leading from one inlet to two discharge ports. The present invention relates to a valve device having a first inlet and two outlets, of the type having a first inlet and two outlets.

In an instantaneous water heater, as shown in Fig. 1, a flowing water sensor 2 is installed in the water supply pipe 1, and its operation closes a micro switch 3, igniting a burner 4 and discharging the high-temperature combustion gas. Heat is exchanged between the water and the water passed through the water supply pipe 1 to the heat exchanger 5 to obtain heated water. That water is from faucet 6
Hot water is supplied to etc.

When the amount of water supplied for hot water supply is large and the water temperature is low, steam contained in the combustion gas from the burner 4 vented to the heat exchanger 5 condenses and the heat exchanger 5 4, it adheres to the other components in the combustion gas and corrodes it, resulting in a significant decrease in its durability.

In order to avoid this drawback, as shown in Figure 1,
A bypass circuit 7 is provided in parallel with the heat exchanger 5, and a flow control valve 8 is interposed in this circuit to reduce the opening degree of this valve, thereby reducing the amount of water flowing to the heat exchanger 5. Prevents defects from occurring. When this means is used, the amount of bypass and the amount of water flowing to the heat exchanger 5 flow at the ratio of the amount of bypass b to the amount of water flowing a, as shown in FIG. This has the disadvantage that more water is passed through the heat exchanger 5 than the amount of water that can avoid the disadvantages, and the above-mentioned disadvantages occur. Furthermore, when it is desired to obtain high-temperature water, it is necessary to reduce the amount of bypass using the flow rate control valve 8 (the shaded area in FIG. 2 indicates its control range), which is troublesome. This inconvenience is especially noticeable when the water heater is not near the place where it is used, especially when it is installed outdoors.

The present invention was devised by focusing on these shortcomings, and its main purpose is to drive the valve bodies that communicate with different discharge ports in response to the pressure difference that occurs with changes in the amount of water flowing. The object of the present invention is to provide a valve having a first inlet and two outlet ports, the secondary purpose of which is to displace one of the two valve bodies after a predetermined displacement of the other to open the valve. It is an object of the present invention to provide a valve device having a first-stream inlet and two discharge ports that can maintain substantially constant the flow rate flowing to the discharge port via the valve body.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a partial sectional view of the valve device 10 with a first inlet and two outlet ports according to the present invention. 11 is a valve box, which includes an inlet 12 and first and second
outlet ports 13 and 14 are provided, and an inlet port 12
First, the first passage 15 passes from the inlet 12 to the first outlet 13 and the second passage 1 passes from the inlet 12 to the second outlet 14.
6 is formed. A portion of the first passage 15 is partitioned by a displaceable diaphragm 17, and a first valve seat 18 and a valve body 19 are provided in the unpartitioned first passage portion 15a. A valve rod 20 is fixed to the valve body 19 and the diaphragm 17.

A pressure regulating coil spring 40 is provided between the partitioned side 17a of the diaphragm 17 and the valve box 11, surrounding the valve stem 20. The first discharge port is formed in the ventilate structure 21, and its constricted portion 21a communicates with the partitioned side 17a of the diaphragm 17 via a through hole 21b. This allows the diaphragm 17 to respond to pressure differences on its sides and to control the discharge pressure in the event of excessive supply pressure.

Further, a second valve seat 2 is provided in the second passage 16 described above.
2 and a valve body 23 are provided, and the valve body 23 is configured to be driven by the valve stem 20. The coupling structure between the second valve body 23 and the valve stem 20 is preferably such that the second valve body 23 is driven by the valve stem 20 after a predetermined drive displacement of the first valve body 19 by the valve stem 20. It is preferable that it be configured as follows. Specifically speaking, the valve stem 20 is attached to the second valve body 23.
The valve rod that has been slidably inserted through the valve body 23 and passed through the valve body 23 is placed at a downstream position by a distance l corresponding to the predetermined drive displacement from the downstream side of the valve body 23 seated on the valve seat 22. An engaging protrusion 24 is provided. The position of the valve stem 20 where the engaging protrusion 24 starts to engage and drive the second valve body 23 is determined when the amount of water passing through the heat exchanger (25 in FIG. 7) is determined as shown in FIG. Amount of hot water dispensed
It is determined by the amount of displacement when P' is reached. When the amount of water flowing at this time is exceeded, the above-mentioned condensation will start. In the figure, the curve L1 shows the amount of hot water supplied, the curve L2 shows the amount of water flowing through the heat exchanger, and the amount between the curve L1 and the curve L2 shows the amount of bypass.

The above-mentioned valve stem 20 is sealed at key points of the valve housing 11 with sealing materials 26 and 27, and is extended to the outside of the valve housing 11. An actuating member 28 is fixed to the tip thereof, and a micro switch 29 installed close to the actuating member is actuated by this member.

An example in which the valve device 10 of the present invention is used in an instantaneous water heater 30 is shown in FIG. An inlet of the valve device 10 is connected to a water supply pipe 31 , a first outlet 13 is connected to a heat exchanger 25 , and a second outlet 14 is connected to a bypass pipe 32 . The outlet of the heat exchanger 25 and the bypass pipe 32 are connected to a hot water supply pipe 33. 34 is a faucet installed in the hot water supply pipe 33. 35 is a burner.

Next, a case will be described in which the operation of the valve device 10 of the present invention configured as described above is applied to an instantaneous water heater.

When the faucet 34 is opened, the pressure generated by the flowing water passing through the constriction portion 21a of the ventilate structure 21 changes. Therefore, a pressure difference is created on both sides of the diaphragm 17, causing the diaphragm 17 to be displaced. The displacement causes a displacement in the valve stem 20 and the micro switch 2
9 is closed and the burner 35 is ignited. The sensible heat of the combustion gas is transferred to the water flowing through the heat exchanger 25 to turn it into hot water, which is then discharged from the faucet 34.

When the flow rate flowing through the hot water supply system just described is small, the above-mentioned pressure difference is also relatively small, and therefore the displacement of the diaphragm 17 is also small, which only causes an increase in the valve opening of the first valve body 19. Valve stem 20
The engagement protrusion 24 does not come into engagement with the second valve body 23, and the second valve body 23 is closed because a pressure difference due to the pressure loss of the heat exchanger is applied to the second valve body 23. It's still there. Such an operation occurs when the opening degree of the faucet 34 reaches θ', that is, the amount of water flowing through the heat exchanger 25 increases, and the amount of water flowing starts to condense the moisture in the combustion gas (this in turn becomes the amount of hot water supplied). As the opening degree of the faucet 34 increases, the amount of water flowing = the amount of hot water supplied also increases according to the curve L1 in FIG. 6 until it becomes . ).

When the faucet opening reaches θ' as shown in Figure 6,
The engagement protrusion 24 of the valve stem 20 engages the second valve body 23 (see FIG. 4) and begins to separate the valve body from the second valve seat 22 (see FIG. 5), and the water supply pipe A portion of the water supplied to the water heater 30 via the bypass pipe 32 begins to be bypassed.

Such a bypass amount is increased as the opening degree of the faucet 34 increases so as to keep the amount of water flowing to the heat exchanger 25 substantially constant. This amount of bypass is shown by the value between curve L1 and curve L2 in FIG.
The amount of water flowing into the heat exchanger 25 is shown by curve L2 in FIG.

As mentioned above, even if the opening degree of the faucet 34 exceeds θ' and the amount of water supplied increases, the amount of water supplied is automatically bypassed via the bypass pipe 32 to keep the amount of water flowing approximately constant. Bypass performance is further improved compared to conventional bypass circuits, and therefore the durability of the heat exchanger 25 is also greatly increased. Further, since there is no need to manually adjust the bypass control valve, which was necessary in the past, even if the water heater is installed outdoors, the instantaneous water heater can be used without having to bother with the above-mentioned adjustments. Furthermore, at a predetermined faucet opening degree, for example, θ' or less, the second valve body (bypass valve body) 23
Because the water heater is seated on the valve seat and closed, it can easily supply hot water at a higher temperature than conventional water heaters.

In the above embodiment, the valve device of the present invention was explained using an instantaneous water heater as an example, but the present invention can be used in applications where it is desired to obtain a substantially constant flow rate from the first discharge port regardless of the supply flow rate. .

As is clear from the above description, the present invention provides the following effects.

The second outlet can be bypassed so that the flow rate from the first outlet does not exceed a predetermined flow rate.

Due to these effects, when the present invention is used in an instantaneous water heater, condensation of moisture in the combustion gas can be prevented and the durability of the heat exchanger can be improved.

Bypassing from the second outlet is performed automatically and does not require any human intervention.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional instantaneous water heater, Fig. 2 is a hot water supply amount-faucet opening curve diagram, Fig. 3 is a partially sectional side view of the valve device of the present invention, and Fig. 4 is a diagram of the valve stem. Fig. 5 shows a state in which the engagement protrusion is engaged with the second valve body, Fig. 5 shows a state in which the second valve body is separated from the second valve seat, and Fig. 6 shows a state in which the valve device of the present invention is used for instant hot water supply. FIG. 7 is a schematic diagram of an instantaneous water heater using the valve device of the present invention. In the figure, 12 is an inlet, 15 is a first passage, 17
is the diaphragm, 18 is the first valve seat, and 19 is the first valve seat.
, 13 is a first discharge port, 21 is a ventilate structure, 21a is a throttle portion, 21b is a through hole, 14 is a second discharge port, 16 is a second passage, 22 is a second valve seat, 23 is a second valve body.

Claims (1)

[Claims for Utility Model Registration] (1) A first pipe that guides fluid from an inlet to a first discharge port.
a second passage that guides the fluid from the inlet to the second outlet bypassing the first passage;
A first valve seat and a first valve body are provided in the first passage for adjusting the flow rate of the first passage, and a second valve seat and a first valve body are provided in the second passage for adjusting the flow rate of the second passage. a valve seat, a second valve body, a diaphragm formed in the first passage portion and displaced in accordance with the amount of fluid flowing through the first passage; and a diaphragm fixed to the diaphragm, while the first valve body and a valve stem connected to a second valve body, and the second valve body is configured to conduct the second passage when the amount of fluid flowing into the first passage exceeds a predetermined value. A valve device having a first-stream inlet and two discharge ports. (2) The claim for utility model registration is characterized in that the driving of the second valve body by the valve stem occurs after a predetermined driving displacement of the first valve body by the valve stem. A valve device having a first inlet and two outlet ports according to claim 1.