JPS6055736B2 - Automatic gas amount adjustment device for gas water heaters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an automatic gas amount adjustment device for a gas hot water boiler, and in particular is capable of supplying an amount of gas proportional to the amount of water.

[Conventional technology and its problems]

When using a gas water heater, it is desirable that the hot water temperature remains constant regardless of whether the amount of water is large or small. The hot water temperature is adjusted by changing the water flow rate with a water flow control device, so if the set water flow is high, the hot water temperature will be low, and if the water flow is low, the hot water temperature will be high, and the relationship between the water flow and the hot water temperature is fixed. Therefore, if you reduce the amount of water and use it, the fire will be extinguished or the temperature of the hot water will become high.
Unable to maintain hot water temperature.

For adjustment, separate operations such as manually adjusting the gas amount are required. Therefore, a device that adjusts the amount of gas according to the amount of water is disclosed, for example, in Japanese Patent Publication No. 3983/1983. This device detects the presence or absence of a flow by installing a ventilator pipe in the water supply pipe on the washbasin side, in order to change the amount of gas depending on whether, for example, hot water is being supplied to a bathtub or a washbasin. Based on the detection results, a diaphragm device (hydroblast switch) is activated, which opens and closes the throttle valve in the gas supply pipe. The above device switches the throttle valve from half open to fully open, and when switching, the diaphragm is displaced by the pressure difference generated by the square of the water volume, and in order to have this change directly affect the throttle valve, the gas volume is changed. The increase is rapid;
It is difficult to make the amount of gas proportional to the amount of water.

Therefore, there is a drawback that the water temperature cannot be maintained constant when the amount of water changes. In addition, in heating equipment, in order to maintain a uniform indoor temperature, when a change in indoor temperature is detected, the amount of gas is changed according to the detected value, and the device is equipped with a servo function to control the temperature to a predetermined set temperature. was a special public official in 1972.
It is shown in FIG. 4 of Publication No.-357m.

This device is functionally different from gas water heaters that do not require servo functions. In addition, in the above device, the gas pressure inside the gas governor changes linearly in proportion to the detected value of temperature change, but the amount of gas sent to the gas burner is physically proportional to the 11 sources of gas pressure. Therefore, temperature changes and gas amount changes do not have a linear proportional relationship. In view of the problems of the prior art as described above, the purpose of this invention is to create a linear proportional relationship between the amount of water and the amount of gas so that the hot water temperature remains constant regardless of changes in the amount of water. shall be. [Means for Solving the Problems] In order to solve the above problems, the present invention provides a water valve device 2, a maximum water flow setting valve 3, and the above-mentioned water valve device 2 in the water supply pipe 1 leading to the heat exchanger of the gas water heater. Water pressure from ventilate pipes etc. downstream of water valve device 2! A detector 4 is provided, which communicates with the water valve device 2 through a valve hole 5 to the inlet side of the water supply pipe 1;
In addition, a first pressure chamber 6 communicating with the outlet side of the water supply pipe 1 and a second pressure chamber 7 communicating with the water pressure detector 4 are provided, and both pressure chambers 6, 7 are provided.
A valve body 9 that opens and closes the valve hole 5 is attached to a diaphragm 8 that separates the
is fixed, and an interlocking device 10 is provided which causes a proportional displacement due to the pressure difference between the first and second pressure chambers 6 and 7. A gas governor 12 is provided in the gas supply pipe 11 leading to the gas burner, and the gas governor 12 is fixed. is provided with a pressure chamber 14 communicating with the inlet side of the gas supply pipe 11 through the valve hole 13 and communicating with the outlet side of the gas supply pipe 11, and a main valve body 15 for opening and closing the valve hole 13.
is fixed to the diaphragm 18 or 17'' pressed by the pressure adjustment section 16 of the gas governor 12, and the pressure adjustment section 16 is provided with a pressure adjustment spring 19 that applies a pressing force to the diaphragm 18ζ or 1V. At the same time, a slidable press rod 20 operated by the interlocking device 10 is engaged with one end of the spring 19,
The spring constant of the spring 19 is such that at the maximum water volume set by the maximum water volume setting valve 3, the pressure rod 20 protrudes to the maximum and the spring 19 causes the diaphragm 18 or 1
The configuration is such that the maximum load is applied to 7'', and when the water stops, the amount of protrusion is minimal and the load is zero.

[Effect]

The maximum water amount is set in advance by operating the maximum water amount setting valve 3.

When the faucet of the gas water heater is opened to the required opening degree, water flows into the water supply pipe 1, a pressure difference corresponding to the amount of water is generated in the detector 4, the second pressure chamber 7 of the water valve device 2 is depressurized, and the diaphragm Water pressure in the valve closing direction acts on 8. The diaphragm 8 and the valve element 9 integrated therewith stop at a position balanced with a required counterforce (in the embodiment, the force of the spring 25), and operate the valve element 9 in response to fluctuations in water pressure to maintain a constant water flow. The first pressure chamber 6 and the second pressure chamber of the water valve device 2
The pressure difference in the pressure chamber 7 is proportionally transmitted to the pressure rod 20 via the interlocking device 10.

The pressing rod 20 advances with a constant stroke proportional to the pressure difference and compresses the pressure adjusting spring 19. The above spring 19 is connected to the diaphragm 18 of the gas governor 12.
Alternatively, a pressing force is applied to 1r to change the gas pressure coming out of the pressure chamber 14 of the gas governor 12. Said detector 4
The pressure difference detected is physically proportional to the square of the amount of water, and the pressure difference passes through the interlocking device 10, the pressure rod 20, and the pressure adjustment spring 19, and maintains a linear proportional relationship to the diaphragm 18 or 17''. is transmitted to generate a gas pressure that is proportional to the pressure difference (proportional to the square of the water amount).The amount of gas sent from the gas governor 12 to the gas burner is proportional to the 112th power of the gas pressure. As a result, the amount of gas has a linear proportional relationship with the amount of water.

In addition, since the spring constant of the pressure adjustment spring 19 is set to a predetermined value, the relationship is such that when the water volume is maximum, the gas volume is also maximum, and when the water volume is minimum (when the water is stopped), the gas volume is zero. It is maintained.

〔Example〕

The apparatus shown in FIG. 1 includes a water valve device 2 connected in flow order to a water supply pipe 1 leading to a heat exchanger of a gas water heater, a maximum water flow setting valve 3, and a water pressure detector 4 such as a ventilate tube.

The water valve device 2 includes a valve chamber 21 communicating with the inlet side of the water supply pipe 1, a first pressure chamber 6 communicating with the valve chamber 21 through the valve hole 5 and communicating with the outlet side of the water supply pipe 1, and a water pressure detector 4. A second pressure chamber 7 communicating through a communication pipe 22, a diaphragm 8 that separates both pressure chambers 6 and 7, and a valve body 9 fixed to the diaphragm 8.
has.

The valve stem 23 of the valve body 9 slidably passes through the casing 24 and projects to the outside. A spring 25 interposed between the diaphragm 8 and the casing 24 is provided inside the second pressure chamber 7, and the spring 25 and the diaphragm 8
The valve body 9 stops at a position where the water pressure difference acting on the valve body 9 is balanced, and the opening degree of the valve hole 5 is kept constant. Further, the maximum water amount setting valve 3 is provided to set the maximum flow rate flowing into the water supply pipe 1, and sets an upper limit of the amount of water flowing out from the faucet, and is set in advance to a required opening degree.

An operating piece 26 is provided at the tip of the valve stem 23, and a microswitch 27 is brought into contact with the surface of the operating piece 26 on the casing 24 side.

This microswitch 27 is turned off when water is stopped and turned on when water is flowing. Communication pipes 28 and 29 are connected to the first pressure chamber 6 and the second pressure chamber 7, respectively, thereby communicating with the first pressure chamber 30 and the second pressure chamber 31 of the interlocking device 10.

These pressure chambers 30 and 31 are separated by a diaphragm 32, and a press rod 20 that slidably passes through a casing 33 is fixed to the diaphragm 32.
A return spring 34 is interposed between one end of the pressing rod 20 and the casing 33. Due to the interlocking device 10 described above, the press rod 20 slides while maintaining a linear proportional relationship with respect to the water pressure difference between the pressure chambers 30 and 31.

Note that the above communication pipes 28, 29, the first and second pressure chambers 30, 31, the diaphragm 32, and the spring 34 may all be omitted, and the valve rod 23 may be integrally connected to the press rod 20.

Next, the gas governor 12 will be explained.

The gas governor 12 of the embodiment is constructed integrally with the casing 33 of the interlocking device 10 described above. gas governor 1
The pressure adjustment section 16 of No. 2 consists of a pressure adjustment spring 19, a diaphragm 17, and a pressure chamber 35 separated from the atmosphere by the diaphragm 17, and presses one end of the pressing rod 20 against one end of the spring 19. Further, the other end of the spring 19 is pressed against the back surface of the diaphragm 17. The spring constant of the spring 19 is determined by the pressure rod 20 at the maximum water volume set by the maximum water volume setting valve 3.
diaphragm 17 due to the spring 19 protruding to the maximum.
It is set so that the maximum load is applied to the tube, and when the water stops, the amount of protrusion is the minimum and the load is zero. Above pressure chamber 3
5 is formed with a valve hole 36 whose degree of opening is set by a diaphragm 17. The gas governor 12 has a valve chamber 37 that communicates with the inlet side of the gas supply pipe 11, and a first pressure chamber that communicates with the valve chamber 37 through the valve hole 13 and communicates with the outlet side of the gas supply pipe 11. It has 14.

The first pressure chamber 14 communicates with the pressure adjustment chamber 35 through a communication passage 38, and further communicates with the valve chamber 41 of the electromagnetic valve device 40 through another communication passage 39. The above first pressure chamber 14
and a second pressure chamber 42 separated by a diaphragm 18
communicates with the pressure adjustment chamber 35 through a communication passage 43 and a valve hole 36.

Further, the valve stem 44 of the main valve body 15 is fixed to the diaphragm 18 that separates the first and second pressure chambers 14 and 42, and the main valve body 15 is moved by the spring force of a return snap ring 45 fitted around the valve stem 44. It is energized in the valve closing direction.

Further, the second pressure chamber 42 is connected to the solenoid valve device 4 through a communication path 46.
0, and the valve chamber 41 further communicates with a communication passage 47.
It communicates with the valve chamber 37 of the main valve body 15 through.

The open ends of the two communicating passages 47, 39 are opposite to each other, and a switching valve 48 is provided between them to selectively open and close the two.When the water is cut off, the switching valve 48 is operated by the spring force of the spring 49. Therefore, the communication path 47 is closed, and the other communication paths 39 and 46 are communicated with each other.

Further, an electromagnet 50 is attached to the switching valve 48, and when the electromagnet 50 is energized by turning on the micro switch 27, the switching valve 48 is actuated, and the communication path 3
9 is closed, and the other communication paths 46 and 47 are made to communicate with each other. The apparatus of the embodiment has the above-mentioned configuration, and its operation will be explained next.

Before using the gas water boiler, the water volume setting valve 3 is operated in advance to set a large water volume.

When the faucet is opened, water leaks into the water supply pipe 1, and the amount of water is 1
A pressure difference proportional to one meter is generated in the detector 4, the second pressure chamber 7 of the water valve device 2 is depressurized, and water pressure in the valve closing direction acts on the diaphragm 8.

The diaphragm 8 and the valve element 9 integrated therewith are stopped at a position balanced with the force of the spring 25, and the valve hole 5 is maintained at a constant opening degree. On the other hand, in the gas governor 12,
In the water-stop state, the first pressure chamber 14 and the second pressure chamber 42 communicate with each other via the pressure adjustment chamber 35, so no pressure difference occurs between them, and the main valve body 15 is closed by the spring force of the spring 45. The hole 13 is in a closed state.

When the microswitch 27 is turned on with the start of water flow, the electromagnet 50 is energized, switching the communication paths 39 and 47,
Gas supply pipe 11 and second pressure chamber 4 via communication passages 47 and 46
2 and push up the valve stem 44.

Moreover, the pressure difference in the water valve device 2 is linked. Device 1
The pressure is transmitted to the first and second pressure chambers 30 and 31 of No. 0, and the diaphragm 32 and the press rod 20 integrated therewith advance by a certain stroke, compressing the spring 19 and applying a press force to the diaphragm 17.

Thereby, the diaphragm 17 maintains the valve hole 36 at a predetermined opening degree. The spring 19 pushes the diaphragm 17 to the maximum extent to close the valve hole 36 when the amount of water is at its maximum, thereby maximizing the pressure difference between the first and second pressure chambers 14 and 42.

Also, when the water is cut off, the valve hole 36 is opened to the maximum, and the communication path 43,
Both pressure chambers 14,
42 and the pressure difference therebetween is made zero. The degree of opening of the valve hole 36 is set in proportion to the amount of water between the maximum amount of water and when the water is stopped, and as a result, the pressure difference between the pressure chambers 14 and 42 is set in accordance with the degree of opening. A pressure/force difference depending on the amount of water acts on the diaphragm 18 of the gas governor 12 due to the pressure in both pressure chambers 14 and 42, and the main valve body 15 stops when the pressure difference and the spring force of the spring 45 are balanced. Then, the valve hole 13 is constantly opened.

In this way, the main valve body 15 is opened, and the first pressure chamber 14
The amount of gas supplied to the gas governor via the gas supply pipe 47 is proportional to the gas pressure in the first pressure chamber 14.

As mentioned above, the pressure difference in the water valve device 2 is proportional to the square of the amount of water, and the interlocking device 10, the pressure rod 20, and the pressure adjustment spring 19 maintain the above relationship in a linear proportional relationship. Since the water is transmitted to the governor 12, the amount of gas supplied to the gas burner has a linear proportional relationship to the amount of water.

Note that when the water is stopped, the pressure difference in the water valve device 2 becomes zero, so the diaphragm 17 by the pressure adjustment spring 19
The pressing force becomes zero and the valve hole 36 is opened.

Further, the microswitch 27 is turned off, the electromagnet 50 is demagnetized, and the switching valve 48 is switched. Thus gas governor 1
When the pressure difference between the two becomes zero, the main valve body 15 closes the valve hole 13 and stops the gas. Gas governor 12 of the embodiment described above
is a so-called servo type in which the pressure of the first pressure chamber 14 is determined by the degree of communication with the second pressure chamber 42 (that is, the degree of opening of the valve hole 36). The gas governor 12 is not limited to any of these types. That is, a main valve body 15 is fixed to one side of a diaphragm 1r that is generally known as a general gas governor, for example, as shown in FIG. 2, and a pressure adjustment spring 19 is provided on the opposite side of the main valve body 15. A spring loaded constant pressure governor 12 may be used.

In the case shown in FIG. 2, when the adjusting spring 19 is pressed by the pressing rod 20 of the interlocking device 10, the diaphragm 17''
The main valve body 15 is pushed through the valve, and the valve hole 13 is opened.

The degree of opening of the valve hole 13 is determined by the position where the gas pressure in the pressure chamber 14 and the pressing force of the adjustment spring 19 are balanced. When the water is stopped, the valve hole 13 is closed by the spring force of the return spring 34.
is occluded. [Effects] This invention has the effect of always dispensing hot water at a constant temperature regardless of changes in the amount of water, since the amount of gas can be adjusted to have a linear proportional relationship with the amount of water. There is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment, and FIG. 2 is a sectional view of another embodiment. 1... Water supply pipe, 2... Water valve device,
3...Maximum water flow setting valve, 4...Water pressure detector, 5...Valve hole, 6...First pressure chamber, 7... ...Second pressure chamber, 8...Diaphragm, 9...Valve body, 10...Interlocking device, 11...Gas supply pipe, 12...・・・・・・
Gas governor, 13... Valve hole, 14...
・First pressure chamber, 15... Main valve body, 16...
...Pressure adjustment part, 17,175,18...Diaphragm, 19...Pressure adjustment spring, 20
・・・・・・Press rod.

Claims (1)

[Claims] 1. A water valve device 2, a maximum water flow setting valve 3, and a water pressure detector 4 such as a ventilate pipe are provided downstream of the water valve device 2 in the water supply pipe 1 leading to the heat exchanger of the gas water heater, and the water valve device 2 A first pressure chamber 6 communicating with the inlet side of the water supply pipe 1 through the valve hole 5 and communicating with the outlet side of the water supply pipe 1, and a second pressure chamber 7 communicating with the water pressure detector 4 are provided, and both of the pressures mentioned above are provided. A valve body 9 that opens and closes the valve hole 5 is fixed to a diaphragm 8 that separates the chambers 6 and 7, and the first and second pressure chambers 6 and 7 are connected to each other.
A gas governor 12 is provided on the gas supply pipe 11 leading to the gas burner, and a gas governor 12 is provided on the inlet side of the gas supply pipe 11 through a valve hole 13 to the gas governor 12. A diaphragm 18 or 17 that is pressed by a pressure regulator 16 of the gas governor 12 is provided with a pressure chamber 14 that communicates with the outlet side of the gas supply pipe 11, and a main valve body 15 that opens and closes the valve hole 13. A pressure adjusting spring 19 is fixed to the pressure adjusting section 16 and applies a pressing force to the diaphragm 18 or 17', and a slidable pressing rod 20 is operated by the interlocking device 10. is engaged with one end of the spring 19, and the spring constant of the spring 19 is set at the maximum water volume set by the maximum water volume setting valve 3.
0 protrudes to the maximum and the diaphragm 1 is moved by the spring 19.
This automatic gas amount adjustment device for a gas water heater is set so that the maximum load is applied to 8 or 17', and the amount of protrusion is minimized and the load is zero when the water is stopped.