JPH0236041Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a water control device (a device that combines flow rate control and water flow detection) for a proportional control type gas water heater, in particular a water pressure adjustment mechanism (also called a water governor mechanism) and a water flow rate setting device. The present invention relates to a water control device in which a mechanism and a water flow detection mechanism are integrated in a compact size.

As shown in Fig. 1, the proportional control type gas water heater has a water control device A installed in the water supply pipe, a gas opening/closing solenoid valve B and a gas proportional solenoid valve C interposed in the gas supply pipe, and further Operation by operating device D
ON, OFF commands and hot water temperature settings are provided, and the proportional solenoid valve C is opened by the ON operation of the water flow detection switch F based on the operation of the water control device A by opening the hot water tap E, and at the same time, the ignition means and the combustion monitoring means. A control device H is provided which electrically controls the proportional solenoid valve C by activating the water temperature and comparing the hot water temperature set in the operating device D with the temperature detected by the hot water temperature detector G. Note that the operating device D turns on and off the power and opens and closes the solenoid valve B.

The water control device A generally includes a water pressure actuator a that is divided into a high pressure chamber and a low pressure chamber by a diaphragm, and a water pressure regulator b that operates according to the water pressure actuator a. A water governor part c on the inlet side, a bench lily d provided on the water supply outlet side for creating a pressure difference between the high and low chambers of the water pressure actuator a, a water flow regulator e disposed downstream thereof, and the water flow sensor. It consists of an operating lever f for turning switch F on and off.

The water control device A described above utilizes a mechanism originally used to open a water pressure responsive gas valve in a normal instantaneous gas water heater, and is not only large in size but also Connection is complicated. As an alternative to this, it has been proposed to provide a flow regulator K (FIG. 2) with a governor function and a water flow detector L (FIG. 3) in the water supply pipe. (Jitsukai 1986
-See No. 74261. ) However, the above-mentioned flow rate regulator K is of a fixed water volume type, and unless a separate water volume setting mechanism is provided, the user cannot automatically obtain a desired water volume at a desired temperature. Otherwise, the user must manually adjust the hot water tap E to obtain the desired amount of water.

Therefore, the applicant first developed a water governor mechanism P, a water flow rate setting mechanism Q, and a water flow detection mechanism R as shown in FIG.
We proposed an integrated flow control device with (Japanese Patent Application No. 57-203740.) However, the flow regulators shown in Figs. 2 and 8 are both easy to use because the manufacturer has know-how regarding the material and shape of the annular ring and core part. I can't. The present invention attempts to solve the above-mentioned problems.
Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

Fig. 4 is a longitudinal sectional view showing an embodiment of the water control device according to the present invention, Fig. 5 is an exploded perspective view of the internal elements of the same, and Fig. 6 A and B are explanations of the operating state of the water governor mechanism. It is a diagram. In these figures, 1 is a main body, which has a large-diameter hollow part 1a, a small-diameter through hole 1b protruding from the lower part thereof, and an enlarged adjustment groove 1c in the middle of the through hole 1b, and a water supply inlet 1d leading to this.
, and a flange 1e is provided on the upper edge. 2
is a stepped cylindrical water pressure regulator that is slidably fitted into the through hole 1b, and includes an upper incisal edge 1 of the adjustment groove 1c.
A wedge-shaped adjustment port 2a is provided downward from the portion f, and a through hole 2b is provided just below the stepped portion, and the orifice 2c is expanded and caulked to a boss 3a at the center of the spring receiving ring 3. Reference numeral 4 denotes a water volume setting movable ring, and a plurality of flow holes 4b are provided on the end surface, leaving a central portion 4a. The spring receiving ring 3 and the water volume setting movable ring 4 are slidably fitted into the hollow portion 1a with their recesses facing each other, and an adjustment spring 5 is stretched across both recesses. Reference numeral 6 denotes a water volume adjustment rod that is inserted into the main body 1 above the water volume setting movable ring 4 in a watertight and rotatable manner perpendicular to its center line, and has a wedge connection with a drive shaft 10 described below at one external end. In addition to forming the groove 6a, a notch 6b for fixing the water amount adjusting cam 7 is provided at the center line portion of the main body 1. Reference numeral 8 designates an O-ring for sealing the insertion portion of the water volume adjustment rod 6, and reference numeral 9 designates a retaining pin. The water amount adjusting cam 7 is fixed to the water amount adjusting rod 6, and when the minor diameter circumferential surface S rests on the center portion 4a of the water amount setting movable ring 4, a stretching force is applied to the adjusting spring 5. The drive shaft 10 engages with the water volume adjustment rod 6 on the outside of the main body 1, and transmits the rotation of the motor 12 to the water volume adjustment rod via the gear box 11. 13 is a gear box fixture. The motor 12 may be a geared motor as shown in the figure or a stepping motor driven by a pulse signal, and the motor 12 receives a signal from a motor drive circuit according to the water volume setting in the operating device D and adjusts the diameter corresponding to the water volume setting value. Rotate the water amount adjustment cam 7 to the desired position. 14 is a sealing lid that closes the through hole 1b.

Reference numeral 15 denotes a ring seat, which has protruding circular parts 15b and 15c having grooves for sandwiching sealing O-rings 16 and 17 on the upper and lower sides of the flange 15a, and has a downwardly expanding communication hole 15d in the center. . Reference numeral 18 denotes a lightweight rotating piece, which is rotatably supported on the support piece 18b by a fulcrum pin 18a, and is connected to the communication hole 15.
A support piece 18b is fixedly attached to the protruding circular portion 15c so as to straddle d. 19 is a magnetic body screwed to the rotating piece 18, and 20 is a non-magnetic washer. 2
Reference numeral 1 denotes a water flow detection body, and the annular seat 15 is fastened together with the main body flange 1e using its flange, and the rotary piece 18 and the magnetic body 19 are housed in the cavity 21a with plenty of room. 22 is the rotating piece 1
8, a proximity switch 21b fixed to the water flow detector 21 on the outer slope in the rotation direction (dashed line arrow);
is the water supply outlet. With the above-mentioned configuration, the inside of the assembly includes the water supply inlet 1d, the adjustment groove 1c, the adjustment port 2a, the orifice 2c, the flow hole 4b, and the hollow part 1.
a, the water supply outlet 2 via the circulation hole 15d and the cavity 21a.
A water supply channel is formed leading to 1b.

Next, the operation of the water control device of the present invention will be explained. First, regarding the water governor function, when the water flow is stationary, the water pressure regulator 2 receives the tension of the adjustment spring 5 through the spring receiving ring 3, and the lower end surface closes to the sealing lid, as shown in Figure 6A. It is in a position where it is in contact with. Now, when a water flow is generated, water flows from the adjustment groove 1c, passes through the adjustment port 2a, passes through the orifice 2c, rises in the hollow part 1a, and at the same time passes through the through hole 2b as shown by the solid arrow in FIG. It flows out below the ring 3. The water flow passing through the orifice 2c creates a water pressure difference between the upper and lower parts of the spring receiving ring 3, which pushes the spring receiving ring 3 upward until it reaches a position where this differential pressure and the tension of the adjustment spring 5 are balanced. At the same time as it comes to rest, the adjustment port 2a is slightly constricted, causing a pressure loss in the water supply and correcting the differential pressure. In other words, the water pressure downstream of the spring receiving ring 3 (hereinafter referred to as operating pressure) is adjusted. Now, if the water supply pressure fluctuates and becomes even higher, the spring receiving ring 3
is raised, and at the same time, the adjustment port 2a is further narrowed to keep the operating pressure constant. The water governor function is achieved by the above, but at the same time, the adjustment port 2a
The passing flow rate also becomes constant due to changes in the water supply passing area.

Next, regarding the water volume adjustment function, the water volume adjustment cam 7 is rotated by the motor driven by the water volume setting operation, and the water volume adjustment cam 7 is adjusted when its long diameter circumferential surface, for example m or l, comes over the center part 4a of the water volume setting movable ring 4. The spring 5 is compressed and increases its tensile force, pushing down the spring receiving ring 3 even though the differential pressure does not change. As a result, the water supply passage area of the adjustment port 2a changes to increase, and the passage flow rate increases. To explain this effect using FIG. 7, if the curve S is the flow rate curve when the circumferential surface s of the water volume adjusting cam 7 is in contact with the water volume setting movable ring 4, then when the same circumferential surface m or l is in contact with the water volume setting movable ring 4, The flow rate curve becomes M or L.

Next, the operation of the water flow detection mechanism will be explained. In FIG. 4, when there is a water flow (solid arrow) and the dynamic pressure of the water flow exceeds a certain value (operating pressure), the rotating piece 18 pivots counterclockwise (dotted arrow) about the fulcrum pin 18a. And magnetic material 19 integrated with it
Proximity switch 22 is turned ON when
Then, the control device H starts functioning. When the water flow stops, the rotating piece 18 returns to the position shown in FIG. 4 due to its own weight.

In the water flow detection mechanism shown in Fig. 3, a magnet is fixed to the swinging valve body, so the valve body chattering (oscillates) when the water flow is around the operating pressure, making it unstable to turn on the proximity switch. In this regard, in the configuration according to the present invention, there is a gap between the circulation hole 15d and the rotating piece 18, so that the rotating piece does not rotate unless there is a water flow higher than the operating pressure. In addition, in the water flow detection mechanism in Fig. 8,
Since the actuator is always present in the water flow, the pressure loss of the water flow is large. For reference, FIG. 9 shows a comparison between the one shown in FIG. 8 and the one according to the present invention. Therefore, when using a gas water heater for circulating heating, if the present invention is used, a circulation pump with a small head can be used.

As mentioned above, the water control device according to the present invention integrates a water pressure adjustment mechanism with a precise water governor function, a water flow adjustment mechanism that enables automatic control, and a water flow detection mechanism with low passing pressure loss, all in a compact design. Because of this, it is particularly excellent as a water control device for proportional control type gas water heaters.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the structure and operation of a conventional proportional control type gas water heater, Fig. 2 is a sectional view of a known flow regulator, Fig. 3 is a sectional view of a known water flow detector, and Fig. 4. 5 is an exploded perspective view of the internal elements of the same, FIG. 6 is an explanatory diagram of the operation of the water governor mechanism of the same, and A is a diagram showing the water flow stoppage. Time and b are when water is flowing. 7th
The figure is a flow rate control characteristic diagram same as the above, FIG. 8 is a longitudinal sectional view of the flow rate control device of the prior application, and FIG. 9 is a comparison diagram of passing pressure loss between the water flow detection mechanism shown in FIG. 8 and the one according to the present application. A...Water control device, B...Gas on/off solenoid valve, C
... Gas proportional solenoid valve, D ... Operating device, E ... Hot water tap, F ... Water flow detection switch, G ... Hot water temperature detector, H ... Control device, a ... Water pressure actuator, b ...
Water pressure regulator, c...Water governor section, d...Bench lily, e...Water flow regulator, K...Flow rate regulator, L...
...Water flow detection body, 1...Main body, 1a...Hollow part, 1
b...Through hole, 1c...Adjustment groove, 1d...Water supply inlet, 1e, 15a...Flange, 2...Water pressure regulator, 2b...Through hole, 2c...Orifice, 3...
Spring receiving ring, 3a... Boss, 4... Water volume setting movable ring, 4a... Center, 4b, 15d... Distribution hole, 5... Adjustment spring, 6... Water volume adjustment rod, 6a... Engagement groove, 6b...notch, 7...water amount adjustment cam, s, m, l...cam circumferential surface, 8,1
6,17...O-ring, 9...stop pin, 10...
... Drive shaft, 11 ... Gear box, 12 ... Motor, 1
3... Mounting tool, 14... Sealing lid, 15... Ring seat,
15b, 15d...Protruding circular portion, 18...Rotating piece, 1
8a... fulcrum pin, 18b... support piece, 19...
Magnetic material, 20...Washer, 21...Water flow detector, 2
1a... Cavity, 21b... Water supply outlet, 22... Proximity switch.

Claims (1)

[Scope of utility model registration request] A water pressure adjustment mechanism includes a ring that moves up and down depending on the water pressure difference before and after the orifice, an adjuster that increases or decreases the number of water passages in cooperation with the ring, and an external motor that controls the load of the spring that urges the ring downward. A water volume adjustment mechanism that changes the amount of water by the rotation of an eccentric cam driven by the main body is housed in the main body, and a rotating part that spans the flow hole and is pivotally supported downstream of the main body is included. A water control device for a proportional control gas water heater, characterized in that a water flow detection mechanism consisting of a water flow detection body and a proximity switch fixed on the outer wall of the detection body is integrally combined.