JPS599290Y2 - Constant pressure water governor - Google Patents

Description

[Detailed description of the invention] This invention relates to a constant pressure water governor device that absorbs fluctuations in primary water pressure and adjusts the secondary water pressure to a constant level in gas instantaneous water heaters, etc., and enables use of the diaphragm at high water pressure. , and the durability is improved.

Conventionally, in water heaters, constant pressure water governors were often found in stop-start water heaters, and were rarely used in stop-start water heaters.

This is thought to be because water pressure acts only on one side of the governor diaphragm when water is shut off using the first stopcock, which poses problems in the durability of the diaphragm and its water sealing properties at high water pressures.

Constant-pressure water governors have the advantage of being able to operate even when the flow rate is restricted on the hot water supply side, so they have high water pressure resistance and durability that can be used in stop-start water heaters. A constant pressure water governor is desired.

The present invention solves the above-mentioned drawbacks and provides a constant pressure water governor that can be effectively applied to both stop-start water heaters and stop-start water heaters.An example of the present invention will be described below with reference to drawings. do.

In Figure 1, 1 is the main body of the water controller, and casing 2
, 3 constitute a water controller.

4 is a water inlet, and 5 is a water outlet leading to the heat exchanger 6.

The water controller has a diaphragm chamber divided by a governor diaphragm 7 and a hydraulically responsive diaphragm chamber divided by a hydraulically responsive diaphragm 8.

On the governor diaphragm side, there are a high pressure chamber 9, a low pressure chamber 10 open to the atmosphere, and a governor actuator 11 that follows the diaphragm 7. There are a valve seat 12, a cylindrical plate 13 that receives the force of the diaphragm 7, a spring 14 that opposes the force of the diaphragm 7, a spring 15 that always biases the governor actuator 11 toward the diaphragm, and the governor actuator. It is well-formed.

Note that 16 is a part of the cylinder provided in the casing 2 on which the plate 13 slides, and a stopper is provided so that the plate 13 slides and reaches its stroke limit at a position where the bottom surface on the diaphragm side coincides with the inner surface 17 of the casing. Part 18
is provided, and the contact surface of the diaphragm on the low pressure chamber 10 side becomes an inverted dish shape with the inner surface of the casing and the bottom surface of the plate at the time of this limit operation, and the diaphragm 7 is constructed in such a shape that it hardly stretches. There is.

In addition, the diaphragm is made of a cloth-filled rubber sheet, and if the elongation exceeds 30%, there is a risk of tearing, so the plate 13 will hit the stopper part 18 before the elongation reaches 25%, and it will not elongate any further. The critical operating point is determined accordingly.

At the time of this limit operation, the governor actuator 11 and the valve seat 12 first come into contact with each other, and the diaphragm 7 separates from the head of the governor actuator 11.

This is because it is necessary for control purposes that the governor actuator 11 and the valve seat 12 come into contact with each other so that they can be closed, and the diaphragm 7 also comes into contact with the casing inner surface 17, so when the diaphragm 7 is at its limit, the governor actuator 11 Head and diaphragm 7
will be separated.

A high pressure chamber 19 is located on the water pressure responsive diaphragm side, and a low pressure chamber 21 is connected to the low pressure generating section of the venturi 20 through an introduction hole.
There is a hydraulic response part formed together with the operation stick 22.

Reference numeral 23 denotes a bypass passage that goes directly from the high pressure chamber 19 to the hot water supply circuit that exits the heat exchanger, passes through a flow rate adjustment section 24 on the way, merges with hot water at a hot water mixing section 25, and is supplied to the hot water outlet.

In the above configuration, the operation during normal use of the water heater (during water flow) is the same as the conventional one, and a detailed explanation will be omitted. However, the water pressure in the high pressure chamber 9 is kept constant, and as water passes through the high pressure chamber 19 of the hydraulic response section and flows through the venturi 20, a pressure difference is created between the high pressure chamber 19 and the low pressure chamber 21 of the hydraulic response section, and the diaphragm 8 is displaced to open a hydraulic valve in a gas circuit (not shown) via the operating rod 22, and the pilot flame that has been ignited in advance ignites and combustion begins.

Therefore, the water exiting the water controller becomes hot water in the heat exchanger 6, mixes with water from the bypass passage 23 in the mixing section 25, and is supplied from the hot water outlet via the hot water supply circuit.

Note that the hot water temperature is adjusted by varying the bypass flow rate in the flow rate adjustment section 24 to change the hot water supply flow rate.

In the governor operating section, the water pressure in the high pressure chamber 9 becomes a force generated on the diaphragm 7 and the plate 13, and the water pressure in the low pressure chamber 1
Since 0 is atmospheric pressure, it is balanced only by the opposing force of the spring 14.

The pressure fluctuation in the high pressure chamber 9 results in a change in the position of the diaphragm 7, and the governor actuator 11 that follows the diaphragm operates simultaneously due to the action of the spring 15, and the gap with the valve seat 12 changes, thereby increasing the flow rate and the water pressure in the high pressure chamber 9. changes, but
As a result, the pressure in the high pressure chamber 9 is kept constant in a state balanced with the spring 14.

This is maintained not only when the inlet water pressure fluctuates, but also when the resistance downstream of the governor changes, the flow level remains constant at different locations.

Therefore, with a constant pressure governor, the governor will work even when the flow rate is throttled with the hot water tap.

FIG. 2 shows the operating state of the governor operating section at this time when water is flowing.

Next, when the hot water supply tap (stop faucet) is turned off, the source water pressure acts on the high pressure chamber 9 of the governor diaphragm chamber, and the low pressure chamber 10 is opened to the atmosphere, so if the water pressure exceeds a certain level, it will resist the force of the spring 14. The diaphragm 7 separates from the head of the governor actuator 11 and moves to the low pressure side to its maximum extent together with the plate 13. The diaphragm itself will not receive water pressure, and even if the pressure in the high pressure chamber 9 increases, no problem will occur.

This state is shown in FIG. Furthermore, this state has no steps and is a smooth inverted dish shape, so there is no worry about cracks in the diaphragm 7, especially at the boundary between the inner surface of the casing and the plate, and there is no need to worry about water passing and shutting off repeatedly (see Figure 2 and Figure 2). The diaphragm 7 can be used without any problem in its operation and durability under the condition shown in Fig. 3).

Figure 4 shows the structure of a conventional constant flow type governor, where 1' is the main body of the water controller, 2' is the casing, 7' is the governor diaphragm, and 11' is the actuator with a lower valve seat (not shown). Indicates the position where they are in contact and do not move upward any further.

If this is a constant pressure type with the low pressure side open to the atmosphere, the diaphragm may be damaged due to force acting on the diaphragm itself during high water pressure, seal leakage due to detachment of the seal part, governor malfunction, or the difference between the inner surface of the casing and the plate. Therefore, there were problems such as tearing due to the diaphragm being pinched and poor durability, making it difficult to use a constant pressure type.

In this invention, the force that acts on the diaphragm during high water pressure is provided by the casing and plate, so there is no need to pay particular attention to the strength of the diaphragm, and there are no problems such as seal leakage due to attachment and detachment, and water sealing performance at high pressure. do not have.

In other words, by taking advantage of the constant-pressure governor, which works effectively even when the tip (hot water tap) is closed, the extremely simple structure makes it possible to apply it to stop-start water heaters, which is a problem with conventional casing configurations. Become.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a gas instantaneous water heater using a constant pressure water governor according to an embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of the operation of the governor diaphragm section, and Fig. 4 is a conventional example. FIG. 1... Main body, 2, 3... Casing,
4...Water inlet, 5...Water outlet, 7...
...Governor diaphragm, 9...High pressure chamber,
10...Low pressure chamber, 11...Governor actuator, 12...Valve seat, 13...Plate, 14...Spring, 15 ... Spring, 16 ... Part of cylinder, 17 ...
...Inner surface of casing 2, 18...part of the stopper.

Claims (2)

[Scope of utility model registration request] (1) A diaphragm whose peripheral edge is supported and fixed between the main body and the casing, a high-pressure chamber and a low-pressure chamber formed by partitioning the internal space created by the combination of the main body and the casing with the diaphragm, a water inlet, and a valve. A water passage that enters the high pressure chamber through the seat and goes from the high pressure chamber to the water outlet, a plate and spring located on the low pressure chamber side that receive the force of the diaphragm, and a plate and spring located on the high pressure chamber side that move with the diaphragm to adjust the opening degree of the valve seat. The inner surface of the casing on the low pressure chamber side is shaped like an inverted dish with a curved side circumferential surface, and when the diaphragm is at its limit of operation, the governor operator contacts the valve seat and the diaphragm A constant pressure water governor that is separated from the head of the governor actuator and configured so that the contact surface of the plate on the low pressure chamber side with the diaphragm is flush with the inner surface of the casing. (2) Utility model registration claim No. 1 in which an inverted plate-shaped casing inner surface and a part of a stopper for regulating the movement of the diaphragm and plate are provided at a position where the extension of the diaphragm toward the low-pressure chamber is kept within 25%. Constant pressure type water governor as described in Section 1.