JPH0249479Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention provides a diaphragm operating device in the water supply passage that automatically opens and closes the gas supply valve in response to water flow, and also provides a diaphragm actuating device upstream of the diaphragm operating device. This invention relates to a stop-off water heater equipped with a faucet for opening and closing water.

[Prior art]

This type of stop-start water heater is equipped with a diaphragm operating device 3 that is separated into a low pressure chamber 3a and a high pressure chamber 3b by a control diaphragm 3c, and the low pressure chamber 3a has a communication passage 4, as shown in FIG. The high-pressure chamber 3b communicates with the negative pressure generating part of the bench lily 2 provided in the water supply passage 1 through the vent lily 2, and the high pressure chamber 3b communicates with the upstream side of the bench lily 2 of the water supply passage 1, and changes the opening degree of the gas valve 5 according to the amount of water flow. The amount of gas supplied to the burner 7 that heats the heat exchanger 6 is controlled to keep the temperature of the hot water almost constant.

[Problem that the invention attempts to solve]

In this type of stop-start type water heater, when the faucet 8 that opens and closes the water flow is suddenly operated, the differential pressure between the low pressure chamber 3a and the high pressure chamber 3b transiently fluctuates due to the inertia of the water flow, etc. However, the gas valve 5 may open and close suddenly and widely, causing explosive combustion in the burner 7, which may cause the pilot burner to go out. The present invention attempts to solve such problems.

[Means for solving problems]

For this reason, in the stop-start type water heater according to the present invention, as shown in FIGS. 1 to 6, the heat exchanger 1
5 and a water supply passage 13 provided with a bench lily 14, and the inside of the housing H are separated into a low pressure chamber 22 and a high pressure chamber 23 by a control diaphragm 21.
2 is communicated with the negative pressure generating section of the bench lily 14 via the communicating passage 19, and the high pressure chamber 23 is communicated with the water supply passage 13 at a portion other than the negative pressure generating section to heat the heat exchanger 15. Burner 1
A diaphragm operating device 20 that opens and closes a gas valve 50 provided in a gas passage 17 to the water supply passage 17; In a stop-start type gas water heater comprising taps 30, 30A, 30B, and 30C, the tap 3
0, 30A, 30B, 30C are the housing H
A cylindrical inner diameter portion 32, 32B provided integrally with the
and a valve seat member 31, 31B having valve seat portions 33, 33B at the end thereof, and an abutment that is supported by the housing H so as to be movable coaxially with respect to the valve seat member and that comes into contact with and separates from the valve seat portions 33, 33B. A faucet valve body 35 having a surface 39, substantially cylindrical fitting portions 40, 40B, 40C protruding from the center of this contact surface, and tapered portions 41, 41A, 41B, 41C continuing beyond the fitting portions; Consists of 35A, 35B, 35C,
The fitting portions 40, 40B, 40C are connected to the contact surface 3.
9 is in contact with the valve seat parts 33, 33B, the valve seat member 3 is separated from the valve seat member 3 with a slight gap.
1, 31B, and the abutment surface 39 is fitted into the inner diameter portion 32, 32B of the valve seat portion 33, 33.
In the state away from B, the inner diameter portions 32, 3
It is characterized by being configured to be located outside 2B.

[Effect]

When the water faucet 30 is opened, a pressure difference is generated between the low pressure chamber 22 and the high pressure chamber 23 of the diaphragm actuating device 20 in accordance with the amount of water flowing through the water supply passage 13, and the opening degree of the gas valve 50 is controlled to control the heat exchanger. Gas is supplied to the burner 18 that heats the burner 15 in an amount corresponding to the amount of water flowing through the burner 15 . Even if the faucet 30 is suddenly opened during this operation, first the inner diameter portions 32, 32B of the valve seat members 31, 31B and the fitting portion 4
A small amount of water flows through the gaps of 0, 40B, and 40C, and then reaches the set water flow rate, so the rate of increase in the water flow rate is gradual, and therefore the differential pressure between the low pressure chamber 22 and the high pressure chamber 23 changes. The speed becomes slow. When the faucet 30 is closed, the low pressure chamber 22 and the high pressure chamber 2
3 disappears, the gas valve 50 is closed and the burner 18 is extinguished. If the faucet 30 is suddenly closed during this operation, a large negative pressure is instantaneously generated downstream of the faucet 30, particularly downstream of the bench lily 14, due to the inertia of water flow. However, in the present invention, after the amount of water flowing is restricted by the gap between the inner diameter portions 32, 32B and the fitting portions 40, 40B, 40C, the contact surface 39 is connected to the valve seat portions 33, 33.
3B, the rate of change in water flow rate is gradual, and the instantaneous increase in negative pressure is small. Therefore, the instantaneous increase in the differential pressure between the low pressure chamber 22 and the high pressure chamber 23 is small.

[Effect of idea]

As mentioned above, according to the present invention, even if the faucet of a stop-off type water heater is suddenly opened and closed, the rate of change in the differential pressure that occurs between the low pressure chamber and the high pressure chamber of the diaphragm operating device becomes gradual, and Since the increase in fuel consumption is also small, the gas valve will not open suddenly, and the amount of gas supplied to the burner will not suddenly increase, causing explosive combustion, which will prevent the pilot burner from extinguishing. .

〔Example〕

Embodiments will be described below with reference to the accompanying drawings. In the first embodiment shown in FIGS. 1 to 3, a water faucet 30, a diaphragm operating device 20, a bench lily 14, a heat exchanger 15, and a hot water supply amount are sequentially installed in the water supply passage 13 from the water supply inlet 13a to the hot water supply pipe 16. A manually adjusted hot water pipe 16 is provided. As shown in FIGS. 1 and 2, a control diaphragm 21 sandwiched between the main housing 10, a valve housing 11, and a cover 12 has a low pressure chamber 22 and a high pressure chamber inside the housing H, which consists of a main housing 10, a valve housing 11, and a cover 12. Diaphragm actuating device 2 separated into 23
0 is formed, the low pressure chamber 22 is communicated with the negative pressure generating portion of the bench lily 14 via the communication passage 19, and the water supply passage 13 passes through the high pressure chamber 23. A stopper 25 whose tip expands in a tapered shape is attached to the center of the control diaphragm 21 so as to protrude toward the valve housing 11 side, and the water supply pressure fluctuates together with the inlet opening 26 that introduces the water supply from the water supply inlet 13a into the high pressure chamber 23. It constitutes a water governor that alleviates fluctuations in water flow when A spring 27 is interposed between the periphery of the opening 26 and the control diaphragm 21 .

Gas passage 17 formed within main housing 10
is provided with a gas valve 50 that controls the amount of gas supplied to the burner 18 that heats the heat exchanger 15. The gas valve 50 consists of a gas valve seat 52 formed in the gas passage 17 coaxially with the control diaphragm 21, a gas valve body 51, and a spring 53 that biases the gas valve body 51 toward the gas valve seat 52. Valve body 5
1 is connected to the control diaphragm 21 via a rod 54. The gas valve body 51 is connected to the water supply passage 13
When water is not flowing through the water supply passage 13, the springs 53 and 27 contact the gas valve seat 52 to close the gas valve 50, and when water flows through the water supply passage 13, a low pressure chamber 22 and a high pressure chamber are formed depending on the amount of water flowing through the water supply passage 13. 23 moves against the spring 53 and the gas valve 5
It is designed to open 0.

As shown in FIG. 1, a diaphragm actuator 20
The inlet opening 26 to the high pressure chamber 23 and the water supply inlet 13a
A faucet 30 consisting of a cylindrical valve seat member 31 integrally formed with the valve housing 11 and a faucet valve body 35 is provided between the valve housing 11 and the faucet valve body 35 . The valve seat member 31 has a cylindrical inner diameter part 32 and a valve seat part 33 at the end,
The interior of the valve housing 11 is formed coaxially with the inlet opening 26, and includes an inlet valve chamber 43 in which the water supply inlet 13a is opened, and an outlet valve chamber 44 in which the outlet opening 26 is provided.
It is divided into In addition, the valve housing 11 includes
Both valve chambers 43, 44 are located on the opposite side of the main housing 10.
A cover 12 is provided to cover the valve housing 1 .
1 and the cover 12 is a faucet diaphragm 46 made of an elastic body such as rubber that supports the faucet valve body 35.
are sandwiched between the faucet diaphragm 46 and the cover 12.
A control room 45 is formed between them. Faucet valve body 3
Reference numeral 5 denotes a thick wall portion 36 integrally formed at the center of the faucet diaphragm 46, a boss member 37 elastically fitted into the center hole of the thick wall portion 36, and a reinforcing washer 38 integrally formed with the boss member 37. It is made up of The valve seat portion 33 of the valve seat member 31 is located around the thick portion 36.
An annular contact surface 39 that can be brought into contact with the contact surface 39 is formed, and a cylindrical fitting portion 40 is formed protruding from the center of the contact surface 39, and a tapered portion 41 is formed following the fitting portion 40. In the state where the contact surface 39 is in contact with the valve seat part 33 as shown in FIGS. 1 and 2, the fitting part 40 is attached to the valve seat member 31 with a certain gap.
The dimensional relationship of each part is determined so that the valve fits inside the inner diameter part 32 of the valve, and moves outside the inner diameter part 32 when the contact surface 39 is separated from the valve seat part 33 as shown in FIG. . To give an example of the dimensions of each part, the diameter of the inner diameter part 32 is 10 mm, the outer diameter of the fitting part 40 is 9.9 mm and the height is 0.5 mm, and the height of the tapered part 41 is 2 mm.
mm and the angle to the central axis is 45 degrees. In addition,
The fitting portion 40 may be slightly tapered. A control hole 37a is provided in the center of the boss member 37, and a small hole 47 is provided in the reinforcing washer 38 and faucet diaphragm 46 to communicate the inlet valve chamber 43 and the control chamber 45.

A pilot valve 48 is slidably supported on the cover 12 coaxially with the faucet valve body 35 via a rod 48b, and a sealing material 48a at the tip thereof is connected to the control hole 3.
The control hole 37 is connected to and separated from the annular projection 37b at the outer end of 7a.
Open and close a. Pilot valve 48 is cover 1
2, the sealing material 48a is biased toward the boss member 37 by a weak spring 49 provided between the
When the control hole 37a is closed, once the contact surface 39 of the faucet valve body 35 comes into contact with the valve seat portion 33 at the tip of the valve seat member 31 by the spring 49, the pressure in the control chamber 45 is reduced to the small hole. 47, the pressure in the inlet valve chamber 43 becomes equal to the water supply pressure, and on the other hand, the pressure in the outlet valve chamber 44 becomes atmospheric pressure, so the abutting surface 39 is forced to press against the valve seat portion 3 due to this pressure difference.
3 to ensure that the water flow is stopped and the faucet 30
is in the closed state shown in FIGS. 1 and 2. If the pilot valve 48 is manually pulled to the right against the weak spring 49 using a knob or lever, the control hole 37a opens and the pressure in the control chamber 45 becomes equal to the pressure in the outlet valve chamber 44 (atmospheric pressure). Therefore, the faucet diaphragm 46 moves toward the control chamber 45 due to the water supply pressure in the inlet valve chamber 43, and as a result, the faucet valve body 35 separates from the valve seat portion 33, and the fitting portion 40 moves outside the inner diameter portion 32. 3, the faucet 30 is in the open state shown in FIG. Faucet 30 as mentioned above
If a diaphragm valve is used, the operating force of the faucet 30 will be reduced and the operation will be easier, but the faucet 30 of the present invention
The valve is not limited to a diaphragm valve, and a regular water faucet may also be used.

When the faucet 30 is open, the water supply passage 1
The amount of water flowing in step 3 changes by changing the opening degree of the hot water tap (not shown). When the amount of water passing increases, the opening degree of the gas valve 50 is also increased by the diaphragm operating device 20, and an amount of gas corresponding to the amount of water passing is supplied to the burner 18 and heating the heat exchanger 15, so the amount of water passing changes. However, the hot water temperature is maintained at a predetermined value.
In addition, although the adjustment device for the tapping temperature is omitted in this embodiment, a known temperature adjustment device may be provided if necessary.

When the hot water tap is open, the water tap 40
Even if the valve seat part 33 is suddenly opened, the contact surface 39
Immediately after being separated from the fitting part 40, the fitting part 40 is located within the inner diameter part 32, as shown by the two-dot chain line in FIG.
First, a small amount of water flows through the gap between the two parts 32 and 40, and then the faucet valve body 35 becomes fully open as shown by the solid line in FIG. The ratio will be gradual. Therefore, the amount of gas supplied to the burner 18 increases slowly, and explosive combustion does not occur.

When the water faucet 40 is closed to stop the flow of water through the water supply passage 13, the action of the springs 53 and 27 causes the gas valve 5 to
0 is closed and burner 18 is extinguished. In this case, if the faucet 30 is suddenly closed, a negative pressure is instantaneously generated on the downstream side of the faucet 30 due to the inertia of water flow. However, the contact surface 39 is
The fitting part 40 enters into the inner diameter part 32 immediately before it comes into contact with 3 and blocks the water flow, and the gap between the two parts 40 and 32 restricts the water flow, so the rate of change in the amount of water flow becomes gradual. , the instantaneous increase in negative pressure is also small. Therefore, the instantaneous increase in the opening degree of the gas valve 50 is small, and explosive combustion does not occur.

In the second embodiment shown in FIG. 4, a tapered portion 41A following the fitting portion 40 has a small angle (the angle with respect to the central axis is 30 degrees), and a second tapered portion 42B with a larger angle is formed beyond it. ing. According to this, the guiding performance when the fitting part 40 is fitted into the inner diameter part 32 is improved, so that the durability of the faucet valve body 35 is improved.

In the third embodiment shown in FIG. 5, an annular recess 34B is formed at the boundary between the inner diameter portion 32B of the valve seat member 31B and the valve seat portion 33B. If foreign matter is contained in the water, this foreign matter may get caught between the valve seat member and the faucet valve body, especially at the corner between the contact surface 39 and the fitting part 40, causing abnormal operation of the faucet. However, according to the third embodiment, such foreign matter is removed from the recess 3.
4 and then flows away when the faucet 30B is opened, so that abnormalities in the operation of the faucet 30B due to foreign objects being caught can be reduced. In the third embodiment, the recess 34B is formed in a stepped shape, but it may be formed in a tapered shape as shown by the two-dot chain line.

In the fourth embodiment shown in FIG. 6, a fitting portion 40C and a tapered portion 41C are formed in a boss portion 37C of a faucet valve body 35C, and a recess 3 is formed between the boss portion 37C and the contact surface 39.
4C to prevent foreign matter from getting caught. In the fourth embodiment, the boss part 37C and the reinforcing washer 38C are separate parts, and the thick part 36C integrated with the control diaphragm 46 is connected to the boss part 37C and the reinforcing washer 3.
8C and is held in place by a retaining ring 37c.

[Brief explanation of the drawing]

Figures 1 to 6 show embodiments of the present invention;
The figure is an overall structural diagram of the first embodiment with main parts cut away.
Fig. 2 is a partially enlarged sectional view of the valve seat member and faucet valve body in a state where they are in contact with each other, Fig. 3 is a partially enlarged sectional view of the valve seat member and faucet valve body in a state where they are separated, and Figs. FIG. 7 is a diagram corresponding to FIG. 2 of the fourth embodiment, and FIG. 7 is a diagram corresponding to FIG. 1 of the conventional example. Explanation of symbols, 13... Water supply passage, 14... Bench lily, 15... Heat exchanger, 17... Gas passage,
18...Burner, 19...Communication path, 20...Diaphragm actuator, 21...Control diaphragm,
22...Low pressure chamber, 23...High pressure chamber, 30,30
A, 30B, 30C... Faucet, 31, 31B...
Valve seat member, 32, 32B...inner diameter part, 33, 33
B... Valve seat portion, 35... Faucet valve body, 39...
Contact surface, 40, 40B, 40C...fitting portion, 4
1, 41A, 41B, 41C... Taper part, H...
…housing.

Claims (1)

[Scope of utility model registration request] A water supply passage provided with a heat exchanger and a bench lily, and the inside of the housing are separated into a low pressure chamber and a high pressure chamber by a control diaphragm. The chamber includes a diaphragm actuator for opening and closing a gas valve provided in a gas passage to a burner that communicates with the water supply passage and heats the heat exchanger in a portion other than the negative pressure generating part, and a diaphragm actuator upstream of the diaphragm actuator. In the stop type gas water heater, the faucet is provided in the water supply passage on the side and opens and closes the flow of water to the water supply passage, and the faucet is provided integrally with the housing and has a cylindrical inner diameter. a valve seat member having a valve seat portion at a portion and an end portion; a contact surface that is supported by the housing so as to be movable coaxially with respect to the valve seat member and that contacts and separates from the valve seat portion; and a contact surface that extends from the center of the contact surface. It consists of a faucet valve body having a protruding approximately cylindrical fitting part and a tapered part continuing beyond the fitting part, and the fitting part is in a state where the contact surface is in contact with the valve seat part. A stop that fits into the inner diameter of the valve seat member with a slight gap, and is configured such that the contact surface is positioned outside the inner diameter when the contact surface is separated from the valve seat. Type gas water heater.