JPH0138461Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a constant flow water governor used in gas water heaters and the like. Conventional constant flow water governors of this type have a valve chamber on the upstream side and a secondary pressure chamber on the downstream side, which communicate with each other, and the secondary pressure chamber has a slidable pressure receiving plate with water passage holes. It is known that a governor spring is inserted into the valve chamber, and a valve body for adjusting the opening degree of the valve hole is disposed in the valve chamber so as to follow the pressure receiving plate. (Utility Model Publication No. 58-138110) In this device, when a sudden amount of water flows due to the click-opening operation of a stop-start type water heater, etc., the governor valve instantly responds to the sudden change in water pressure. Due to this, a phenomenon in which the amount of water undulates (water hammer) occurs, and a separate water hammer prevention device must be installed in addition to the constant flow water governor.

The purpose of the present invention is to eliminate the above-mentioned inconveniences, and will be explained in detail with reference to the drawings. Fig. 1 is a structural diagram of a water heater incorporating an embodiment of the present invention, and 7 is a water heater. With a constant flow water governor installed on the inlet side,
Hot water is supplied to the outlet via a water flow switch 8 and a heat exchanger 9. Reference numeral 10 denotes a gas burner, which is a general water heater that opens a solenoid valve 12, a proportional valve 11, etc. in response to a signal from a control unit 13 to perform combustion. Second
The figure is a cross-sectional view showing one embodiment of the present invention used in FIG. The valve chamber 3 is a space between the valve hole 14 and the governor valve body 2. Reference numeral 15 denotes a water passage hole opened on the upstream side of the governor body 4, which communicates with the water passage 16 of the governor valve body 2 and communicates with the secondary pressure chamber 17. 18 is a diaphragm, the governor valve body 2 and the governor body 4 are stretched, and the periphery is clamped by a spring plate 19. 20 is a sliding surface on which the inner surface of the cylindrical case 1 and the governor body 4 slide. 21 is a spring that acts in the direction of closing the governor valve 2. 6 is a spring that acts in the direction in which the governor valve 2 is opened. 5 is spring plate 1
9 is a spring that returns the movement of the governor body 4 sliding in the cylindrical case 1 against water pressure.
Reference numeral 22 is a temperature sensing member that detects the temperature of incoming water, and depending on the detected temperature, the advancing/retracting rod 23 comes into contact with the locking piece 24 and slides with the slider 25. FIG. 3 is an operational cross-sectional view, and the cross-sectional view above the center line shows the case where the inlet water temperature is high, and the governor valve body 2 is retracted by the elongation force of the retractable rod 23 as detected by the temperature detection member 22. The gap between the valve hole 14 and the governor valve body 2 is increased to increase the amount of water flowing. On the other hand, the cross-sectional view below the center line shows that when the inlet water temperature is low, the advancing/retracting rod 23 shrinks and the valve hole 14
The governor valve body 2 is adjusted back and forth so as to reduce the amount of water flowing by narrowing the gap between the governor valve body 2 and the governor valve body 2. FIG. 4 is an operational diagram when absorbing water hammer that occurs when a bell (not shown) is opened and closed. The sectional view above the center line shows the state when water is flowing, and the sectional view below the center line shows the state when it is stopped (at rest), and the water inflow pressure has stopped, so the governor body 4 is moved by the spring. Cylindrical case 1
is returned to the upstream side.

To explain the operation here, when the stopper (not shown) is changed from the closed state to the open state as shown in the cross-sectional view below the center line as shown in FIG. The governor valve body acts in the pressure direction against the plate 19 and absorbs the instantaneous pressure by sliding the governor body 4 inside the cylindrical case 1 without the governor valve body coming into contact with the valve hole 14 (no valve closing action). If the pressure is even stronger, the spring plate 19 is engaged with the cylindrical case and moved forward until the spring plate 19 is deformed, thereby absorbing the occurrence of water hammer. In particular, water hammer often occurs when the bell is opened, and in order to prevent this occurrence, the present invention is designed to prevent the governor body itself, which houses the governor valve body within the cylindrical case 1, from opening or closing the bell. It is designed to be able to slide when the cap is closed.

As described above, according to the present invention, it is possible to eliminate the inconvenience of having to separately install an absorption device to prevent water hammer in addition to the conventional constant flow water governor, and it is also possible to have a simple configuration and furthermore detect temperature. It has the advantage that the member 22 can also be used and can be linked to the inlet water temperature.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of the water heater used in this invention.
FIG. 2 is an operational sectional view showing an example of an embodiment of the present invention;
Figure 3 is a sectional view of the operation due to changes in inlet water temperature, Figure 4
The figure is an operational cross-sectional view. 1...Cylinder case, 2...Governor valve body, 3...
Valve chamber, 4... Governor body, 5... Spring, 6... Spring, 7... Constant flow water governor, 8... Water flow switch, 9... Heat exchanger, 10... Gas burner, 11
...proportional valve, 12 ... solenoid valve, 13 ... control section,
14...Valve hole, 15...Water hole, 16...Water passage, 17...Secondary pressure chamber, 18...Diaphragm,
19...Spring plate, 20...Sliding surface, 21...Spring, 22...Temperature detection section, 23...Advancing/retracting rod, 24
...Latching piece, 25...Slider.

Claims (1)

[Scope of utility model registration request] In a constant flow water governor 7 in which a governor valve body 2 is disposed within a cylindrical case 1, a valve chamber 3 and a secondary pressure chamber 17 are configured, and a diaphragm 18 connects the governor valve body 2.
The governor body 4 is configured to be housed so as to be moved back and forth, and a spring plate 19 is sandwiched on the outside of the rear end of the governor body 4, and the governor body 4 is slidably housed in the cylindrical case 1 and is always supported by a spring 5. A constant flow water governor characterized in that the governor body 4 is biased toward the water inlet side via the spring plate 19.