JPS6116892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an instantaneous water heater such as an electric instantaneous water heater or a gas instantaneous water heater. '', and is turned ``off'' by the water pressure when the water is closed smaller than that. In order to prevent hot water from being supplied, the water shutoff/flow rate adjustment valve is turned on to start heating when it is opened above a certain level, and turned off to stop heating when it is closed less than that. The present invention relates to an operating hydraulic response device.

Note that the "on" operation in the present invention refers to an operation associated with the heating operation of the instantaneous water heater, and the "off" operation refers to an operation associated with the heating operation of the instantaneous water heater.

Conventional hydraulic response devices of this kind will be explained in detail later, but in a system that senses the water pressure in the first water area upstream of the valve body when the valve is opened, the high water pressure that is obtained at the moment the valve is opened is detected. On the other hand, it has the disadvantage that the valve is very small and turns on and starts heating even when the water volume is extremely small, supplying extremely heated water, and when the valve is fully opened, it is not detected. This has the disadvantage that it is easy to malfunction when the water pressure in the valve decreases and the heating stops, and the system that senses the water pressure in the second body of water downstream of the valve stopper when the valve is opened does not allow the valve to open. If the initial high water pressure cannot be utilized and the valve is not opened until a considerable amount of water has been reached, it will not exhibit stable "on" operation, and when the valve is throttled down to a relatively small amount and the water volume is low to medium, it will "off" and heat up. The problem was that it was easy to malfunction, causing the system to stop.

The present invention is an improvement of the method of sensing the water pressure of the first water area upstream of the valve stopper when the valve is opened, as described above, and the valve is reliably turned on when the valve is opened appropriately. This has been improved so that the water pressure sensed when the valve is fully opened does not drop and maintains "on" operation.

An embodiment of the present invention will be described below with reference to the drawings. Here, an example of use in an electric instantaneous water heater will be explained.

FIG. 1 shows the valve section for water shutoff and flow rate adjustment. In the figure, reference numeral 1 denotes a metal valve housing, inside which a valve chamber 2 having a substantially cylindrical shape is formed, and a water inlet 3 that opens at the center of the bottom of the valve chamber 2 is formed at the bottom, and the side peripheral wall is Some valve chambers 2
A water outlet 4 is formed which opens in the middle of the side surface, and a lid body 5 is screwed to the top so as to close the opening of the valve chamber 2. At the center of the lid body 5, there is a screw hole 6 that penetrates into the outside of the valve chamber. is forming. Furthermore, an annular seat 7 is formed on the periphery of the opening of the water inlet 3 to the valve chamber 2, which is raised toward the inside of the valve chamber. 8 is valve chamber 2
The plug body is inserted into the interior so that it can move up and down, and its lower part is a plug part 9 that has rubber packing for opening and closing the opening of the seat part 7. When the valve is closed, the plug part 9 closes the seat part 7. The middle part of the upper part is a relatively thin cylindrical shaft part 10, and the upper part is a water stop flange part 11. An O-ring 12 that is in contact with the peripheral wall of the valve chamber 2 is fitted and fixed thereon, and a shaft 13 that is led out from the screw hole 6 of the lid body 5 is connected to the upper side of the O-ring 12.
The shaft 13 is formed with a threaded portion 14 that is screwed into the screw hole 6, and the upper end of the shaft 13 has a knob (not shown) for the user to turn the shaft 13.
is formed. and the circumferential wall of the plug part 9 and the valve chamber 2
The dimensions of both are determined so that a gap 15 is created between them and the peripheral wall. Furthermore, when the plug part 9 closes the opening of the seat part 7, the plug part 9 is located at a lower position than the water outlet 4, the shaft part 10 is located at the same position as the water outlet 4, and the flange part 11 is located at the same position as the water outlet 4. It is now located at a higher position. Here, when the opening of the seat part 7 is opened, the water area below the plug part 9 of the valve chamber 2 is called a first water area, and the water area above the plug part 9 of the valve chamber 2 is called a second water area. A pressure receiving housing 16 is connected to a part of the side wall of the valve housing 1, and a circular pressure receiving chamber 18 adjacent to the valve chamber 2 is formed through a partition wall 17 inside the housing. It is divided into two chambers, one of which communicates with the valve chamber 2 through two water holes 20 and 21 provided in the partition wall 17. One water passage hole 20 is provided at the lower end of the side wall of the valve chamber near the seat 7 so as to communicate with the first water body when the valve is open, and the other water passage hole 21 communicates with the second water body when the valve is open. It is provided in the middle of the side wall of the valve chamber at the same position as the water outlet 4 so as to communicate with it. The opening area of the upper water passage hole 21 is set in a range of 1/6 to 1/2 of the opening area of the lower water passage hole 20. 22
is a circular pressure receiving plate disposed in the other chamber of the pressure receiver 18, and an operating shaft 23 connected to the center thereof is led out through a guide hole 24 of the pressure receiving housing 16. This operating shaft 23 has a coil spring 25.
A micro switch (not shown) is provided at the tip of the actuating shaft 23 to face it. When the water pressure in the pressure receiving chamber 18 increases, the operating shaft 23 moves in the direction A against the spring 25, turning on the micro switch, and when the water pressure in the pressure receiving chamber 18 decreases, the returning force of the spring 25 moves the operating shaft 23. Moving in direction B turns off the microswitch, which is connected in series to the heater that is the heat source of the electric instantaneous water heater. Further, the chamber in which the pressure receiving plate 22 is housed communicates with the outside air through a ventilation hole 26 provided in the pressure receiving housing 16.

In the above configuration, when the shaft 13 is turned using the knob at the upper end of the shaft 13, the plug body 8 moves up and down together with the shaft 13 due to the threaded relationship between the screw hole 6 and the threaded portion 14. When the plug part 9 comes into contact with the seat part 7, the valve is closed. When the plug part 9 separates from the seat part 7, the water inlet 3 opens, and tap water flows from the water inlet 3 to the gap 15 to the water outlet 4 as shown by the arrow, and then to the heat exchanger of the electric instant water heater. It flows. Plug body 8
As it moves upward, the gap between the stopper part 9 and the seat part 7 becomes larger, and the water flow rate also increases. In other words, the plug body 8
The flow rate can be adjusted by moving up and down.

At the beginning of the opening of the valve, some of the tap water flows into the tap part 9.
When the water hits the water, it flows into the pressure receiving chamber 18 through the lower water passage hole 20, and the water pressure in the pressure receiving chamber 18 increases. Therefore, the pressure receiving plate 22 and the operating shaft 23 are pushed by the diaphragm 19 and move in the direction A against the spring 25, turning on the micro switch. When the switch is turned on, electricity is supplied to the heater, and the heat generated by the heater heats the water passing through the heat exchanger. The water in the pressure receiving chamber 18 returns to the second water area of the valve chamber 2 through the upper water passage hole 21. When the valve is open, this state is maintained regardless of the degree of opening of the valve, and hot water is supplied.

When the valve is closed, no water flows into the pressure receiving chamber 18, and the water pressure in the pressure receiving chamber 18 decreases, so the operating shaft 23 and the pressure receiving plate 22 move in the direction B by the return force of the spring 25, and the micro switch is activated. Turn off the heater to stop generating heat. Therefore, when the valve closes, the heating by the heater also stops, and hot water supply stops.

By the way, FIG. 2 shows a typical example of a conventional device of this type. The device shown in FIG. 2 has one water passage hole 2 opened at the lower end of the side wall of the valve chamber 2 near the seat 7.
The pressure receiving chamber 18 communicates with the lower part of the valve chamber 2 through 0', and at the beginning of the opening of the valve, water from the water inlet 3 hits the plug part 9 and spreads laterally, and some of the water passes through. As the water enters the pressure receiving chamber 18 through the hole 20', the pressure in the pressure receiving chamber 18 is increased, and when the valve is subsequently opened, the water pressure in the lower part of the plug part 9 is increased due to fluid resistance due to the gap 15 between the plug part 9 and the peripheral wall of the valve chamber 2. The water pressure in the first water area is kept higher than the water pressure in the second water area above the plug part 9, and the water pressure in the pressure receiving chamber 18 is also kept high. The operation of this device is almost the same as the embodiment described above, so it will not be described here, but when the valve is opened, the water that enters the pressure receiving chamber 18 through the water passage hole 20 located upstream of the stopper 9 ends up there. This configuration is largely different from the embodiment. Therefore, when the valve is fully open and the gap 15 is at its maximum, the water pressure in the first water area drops to the same level as the water pressure in the second water area, and the return force of the spring 25 causes the operating shaft 23 and the pressure receiving plate to 22 moved in direction B, causing a malfunction in which the valve was detected as closed even though it was fully open.

Further, FIG. 3 shows another typical example of the conventional technology. Third
In the device shown in the figure, the pressure receiving chamber 18 communicates with the water flow path through one water passage hole 20'' opened at the water outlet 4, and as the degree of opening of the valve increases, the flow rate passing through the water outlet 4 increases. A portion of the water flowing through the water outlet 4 flows into the pressure receiving chamber 18 through the water inlet 20'', thereby increasing the water pressure in the pressure receiving chamber 18. The operation of this device is also almost the same as that of the above embodiment, so the explanation will be omitted. However, since the pressure receiving chamber 18 is configured to communicate with the water outlet 4 on the downstream side of the plug part 9, the high pressure of the water flow at the initial stage of opening the valve is controlled. If it is not available and a certain amount of water is not flowing,
The water pressure in the pressure receiving chamber 18 is applied to the operating shaft 23 and the pressure receiving plate 22.
was not able to move the valve in the A direction, and when the valve was throttled down to a relatively small amount and the flow rate was low to medium, a malfunction could occur in which the valve was detected as closed even though it was open. Particularly when the tap water pressure was low, the valve would not turn on unless it was close to fully open.

In contrast to these, the device of the present invention shown in FIG.
The pressure receiving chamber 18 communicates with the valve chamber 2 through two upper and lower water holes 20 and 21, and when the valve is open, pressure is received by the water flow flowing from the lower water hole 20 → the pressure receiving chamber 18 → the upper water flow hole 21. Since the chamber 18 acts as a bypass flow path for the water flow flowing through the gap 15 between the stopper part 9 and the valve chamber 2, the water flow from the water inlet 3 hits the stopper part 9 in the lateral direction when the valve is opened. A part of the expanded water flow rushes into the pressure receiving chamber 18 through the water passage hole 20, and it is possible to detect the opening of the valve by using the high water pressure of the water flow at the initial stage of opening the valve, and when the valve is opened thereafter, the valve is fully opened. Pressure receiving chamber 18 including time
Because of the bypass water flow flowing through the valve, the water pressure in the pressure receiving chamber 18 can be kept almost constant, and the valve remains detected as open. Therefore, opening and closing of the valve can be detected reliably, and there is no risk of malfunction as in the conventional example.

In the device of the present invention, the area ratio of the water passage holes 20 and 21 has a large effect on the water pressure in the pressure receiving chamber 18. Experimentally, the diameter of the lower water passage hole was 5 mm (area 19.6 mm ² ) and the diameter of the upper water passage hole was 30 mm for the diameter of the circular pressure receiving chamber.
27 mm (area 5.78 mm ² ) was the best.

The relationship between the degree of opening of the valve and the force exerted on the actuating shaft under these conditions is illustrated in Figure 4a. 4b is the case of the conventional example shown in FIG. 2, and FIG. 4c is the case of the conventional example shown in FIG. 3. When the area of the upper water passage hole 21 is made smaller than 5.73 mm ² , the characteristic curve approaches from a to b, and when the area of the upper water passage hole 21 is made larger than 5.73 mm ² , the characteristic curve approaches from a to c. Experimentally, upper water passage hole 21
The opening area of is relative to the opening area of the lower water passage hole 20.
Relatively good results were obtained in the range of 1/6 to 1/2.

As is clear from Fig. 4, in the device of the present invention, the force obtained on the actuating shaft is very stable with respect to the opening degree of the valve, and there is no phenomenon in which "off" operation occurs when the valve is fully opened. There is also no risk of boiling water when the amount of water is extremely low. Furthermore, compared to the conventional example shown in FIG. 3, the force applied to the operating shaft rises quickly at the initial stage of opening the valve, and the "on" operation can be started when an appropriate amount of water is reached.

As described above, according to the present invention, when the opening degree of the valve becomes large to a certain extent, the instantaneous water heater is turned on so as to start heating, and when the amount of water is extremely small, heating starts and the water becomes extremely hot. It is possible to prevent the danger of boiling water when hot water is supplied, and even if the first water pressure decreases when the valve is fully opened, it can prevent malfunctions such as when the water pressure of the instantaneous water heater is turned off. It has excellent performance as a response device.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a hydraulic response device for an instantaneous water heater according to an embodiment of the present invention, FIGS. 2 and 3 are longitudinal sectional views of conventional devices, and FIG. It is a diagram showing a comparison of characteristics with the device. 1...Valve housing, 2...Valve chamber, 3
...Water inlet, 4...Water outlet, 5...Lid, 7...
Seat part, 8... Plug body, 9... Plug part, 10... Shaft part,
11...flange part, 12...O ring, 13...
... Shaft, 15 ... Gap, 16 ... Pressure receiving housing, 18 ... Pressure receiving chamber, 20, 21 ... Water hole,
22...Pressure plate, 23...Operating shaft, 25...Coil spring.

Claims (1)

[Scope of Claims] 1. A valve chamber having a substantially cylindrical space, a water inlet opening in a part of one end face of the valve chamber, and a circumferential wall on the side of the valve chamber that moves in the axial direction within the valve chamber by external operation. A stopper that opens and closes the water inlet with a stopper at the tip that has a larger diameter than other parts so as to create a small gap in between, and a valve that is divided into two by the stopper when the water inlet is open. A water outlet opened in a part of the side wall of the valve chamber, which is the second water area on the opposite side of the first water area where the water inlet is located, of the two water areas of the chamber, and a first water area when the water inlet is open. A plug part communicates with the valve chamber through a first water hole opened in the side wall of the valve chamber near the water inlet, which becomes the water area, and a second water hole opened in the side wall of the valve chamber, near the water outlet, which becomes the second water area. A pressure receiving chamber that creates a bypass water flow for the water flowing through the gap between the valve chamber and the side wall of the valve chamber, and a pressure receiving chamber that senses the water pressure in this pressure receiving chamber, and when the water pressure exceeds a certain set value, it shifts in the direction of starting heating of the instant water heater. and a constant pressure displacement mechanism that returns to a direction in which heating of the instantaneous water heater is stopped when the water pressure becomes smaller than a set value. 2. The constant pressure displacement mechanism has a diaphragm or bellows phragm that senses the water pressure in the pressure receiving chamber, and a spring that biases the diaphragm or bellows phragm in a direction that resists the displacement of the diaphragm or bellows phragm when the water pressure increases, and A hydraulic response device for an instantaneous water heater according to claim 1, which is configured to open and close a switch. 3. The instant hot water according to claim 1 or 2, wherein the ratio of the opening area of the second water passage to the opening area of the first water passage is in the range of 1/6 to 1/2. Water pressure response device for boilers.