JPS6311463Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a slow ignition device for a mixing type water heater.In order to ensure slow ignition performance even in the high water pressure range in ordinary water heaters, the primary chamber and hot water outlet of the water pressure responsive gas valve device are It is known (for example, Utility Model Application Laid-Open No. 55-168778) to suppress the pressure in the primary chamber below a certain limit by communicating with the primary chamber through a bypass passage and incorporating a relief valve into this bypass passage. If this structure is applied to a mixing type water heater, the amount of water passing through the bypass path is throttled when high-temperature hot water is produced in the mixing type water heater, which increases the pressure in the primary chamber and degrades the slow ignition performance of the slow ignition device in the hydraulic response device. .
To correct this, the present invention aims to obtain the same slow ignition performance when hot water is tapped out at a high temperature as when hot water is tapped out at a low temperature, regardless of the high or low temperature control position of the temperature control pot.

One embodiment will be described below with reference to the drawings.

In the drawing, A is a water pressure response device that automatically opens and closes a gas valve that uses water supply pressure to supply and cut off gas to the main burner. When it passes through and enters the primary chamber E1 of the diaphragm chamber E, the gas valve shaft 13 is linked via the diaphragm 14 to open and close the gas valve (not shown) due to the action of the water supply pressure. Reference numeral 17 denotes a ventilate section provided on the downstream side of the temperature control chamber B, which is the secondary chamber E2 of the diaphragm chamber E.
The communication pipe 18 is connected to the main body through a communication pipe 18, and a slow valve 19 is provided in the middle of the communication pipe 18.
These are thus well-known configurations for slow ignition devices for hydraulic response devices. B is a temperature control pot provided at the base end of the water supply channel 1 to the heat exchanger C, in which the hot water tap hole 2 and the low temperature hot water tap hole 3 are located at different positions in the axial direction, facing the water supply inlet 16. These holes 2 and 3 are connected to the heat exchanger C by rotating the temperature control pot B.
The water supply channels 1 are connected to each other. In addition, the temperature control pot B has a bypass hole 5 that communicates with the bypass path 4 to the mixer D when hot water is not being tapped at a high temperature, and a relief hole 7 that communicates with the relief path 8 that communicates with the bypass path 4 to the mixer D. While wearing it,
A relief hole 6 is provided which communicates with the relief passage 8 only when hot water is tapped at a high temperature. The high temperature tapping hole 2 is connected to the low temperature tapping hole 3 in order to reduce the amount of water supplied to the heat exchanger C.
It has a smaller diameter and has a relief hole 6 when hot water is tapped out.
has a larger diameter than the relief hole 7 when hot water is tapped at a low temperature. The diameters of these through holes 2, 3 and 5, 6, 7 are preset according to the high and low hot water temperatures, etc. 10 is a relief valve equipped in the relief passage 8;
It is always biased in the closing direction by a spring 9 having a preset spring pressure. In other words, Hatsujo 9
The spring pressure does not open the relief valve 10 only by the water pressure from the through hole 6 or 7, but if the negative pressure generated in the bypass passage 4 is added to these spring pressures immediately after the tap 21 is opened, the relief valve 10 opens. It is set to In addition, the water supply inlet 16 is connected to each through hole 2, 3 and 5, 6, 7.
It goes without saying that the relief passage 8 may be a common passage through which both the through holes 6 and 7 communicate, or may be a separate passage for each. However, if each is separated, it is necessary to equip each with a relief valve 10.

In the above configuration, when the temperature control pot B is rotated and set to low temperature tap, the low temperature tap hole 3 communicates with the water supply channel 1 to the heat exchanger C, as shown in FIGS. 1 and 2. At the same time, the bypass passage 4 to the mixer D is communicated with the bypass hole 5, and further,
The relief passage 8 communicates with a relief hole 7 during low-temperature tapping. Therefore, when the water supply valve (not shown) is opened and the tap 21 is opened to start tapping hot water, the flowing water flows out from the hot water tapping pipe 20 from the low-temperature tapping hole 3 via the heat exchanger C at the initial stage of tapping. Since the flow velocity is considerably high, a large negative pressure is generated by the mixing water supplied from the bypass hole 5 to the mixer D via the bypass path 4, and this negative pressure is applied to the relief valve 10, and the pressure of the water flowing from the through hole 7 is also added. The relief valve 10 is opened by a certain opening degree (opening degree "small") by the through hole 7 against the spring 9, and the mixing water supply also flows out from the relief passage 8. Therefore, together with a large amount of water being supplied from the low-temperature tapping hole 3 to the heat exchanger C, the water supply pressure in the primary chamber E1 of the diaphragm chamber E is weakened, the vent lily effect is slightly weakened, and the gas valve shaft 13 caused by the diaphragm 14 is weakened. The pressing operation to the left is slow, the gas valve is opened slowly, and the main burner is slowly ignited. After the initial stage of hot water supply until the main burner is ignited, the negative pressure at the time of opening of the tap 21 in the bypass path 4 gradually disappears, and the relief valve 10 is closed by the repulsive force of the spring 9.
A normal low-temperature hot water tapping state is reached, and the water supply pressure in the primary chamber E1 of the diaphragm chamber E also increases, and the gas valve is fully opened.

Next, when the temperature control pot B is turned and set to high temperature hot water, the heat exchanger C is turned as shown in Figure 3.
A high-temperature tap hole 2 communicates with the water supply channel 1, and a relief hole 6 for high-temperature tap water connects with the relief passage 8. Therefore, when the tap 21 is opened to start tapping hot water, the flow rate of the water flowing out from the hot tap tap 20 from the hot tap tap hole 2 via the heat exchanger C is high in the early stage of hot tap tap, so there is a negative pressure in the bypass path 4. The relief valve 10 is opened by a predetermined opening degree (opening degree "large") through the passage hole 6 against the spring 9, and the diaphragm chamber E is opened in order to guide a part of the flowing water to the bypass path 4. The water supply pressure in the primary chamber E1 becomes weaker, the bench lily effect also weakens considerably, and the diaphragm 14
This causes the gas valve shaft 13 to be pushed slowly to the left, so that the gas valve is opened fairly slowly, and the main burner is slowly ignited. After the initial stage of hot water dispensing until the main burner is ignited, the differential pressure between the bypass passage 4 and the relief passage 8 gradually disappears, the relief valve 10 is closed by the repulsive force of the spring 9, and the normal high-temperature hot water dispensing state is established, and the diaphragm chamber E The water supply pressure in the primary chamber E1 also increases and the gas valve is fully opened. In addition, the opening degrees of the relief holes 6 and 7 during hot water dispensing at high temperature and low temperature at the initial stage of hot water dispensing are such that the opening area is large during high temperature dispensing, and the opening area is small during low temperature dispensing. The amount of water released to the bypass path 4 during hot water tapping is larger than that when hot water is tapped at a low temperature, and the bench lily effect is greatly reduced when hot water is tapped as compared to when hot water is tapped at a low temperature, and the bench lily effects of the two are almost the same. In this way, the same slow ignition performance can always be obtained regardless of the high or low hot water outlet position of the temperature control pot.

As explained above, this invention is based on the well-known slow ignition device in the water pressure response device of a mixing type water heater, in which a relief valve is provided in the relief passage communicating with the bypass passage, and the opening area of the relief passage is adjusted by the rotation of the temperature control knob. By increasing the opening area when hot water is tapped at a high temperature and decreasing it when hot water is tapped at a low temperature, the same slow ignition performance can always be obtained regardless of the high or low temperature control position of the temperature control pot.

[Brief explanation of the drawing]

Figure 1 is an overall sectional view of an embodiment of a slow ignition device for a mixing type water heater when hot water is tapped out at low temperatures, Figure 2 is an enlarged sectional view of only the main parts, and Figure 3 is the main parts when hot water is tapped out at high temperatures. FIG. A...Hydraulic response device, B...Temperature control, C...
...Heat exchanger, 1... Water supply channel, 2... Hole for high temperature tapping, 3... Hole for low temperature tapping, D... Mixer, 4
... Bypass passage, 5 ... Bypass hole, 6 ... Relief hole when hot water is discharged, 7 ... Relief hole when hot water is discharged at low temperature, 8 ... Relief passage, 9 ... Spring, 10 ... Relief valve .

Claims (1)

[Scope of utility model registration request] A temperature control pot B of a mixing type water heater equipped with a water pressure response device A that opens and closes a gas valve based on water supply pressure has a high-temperature tap hole 2 and a low-temperature tap hole that communicate with a water supply channel 1 to a heat exchanger C. 3, and a bypass hole 5 that communicates with the bypass path 4 to the mixer D when hot water is not being tapped at a high temperature, and a relief hole 6 that has a large opening area for high-temperature tapping and a relief hole 6 that has a small opening area for low-temperature tapping. The vent holes 7 are bored so that the vent holes 6 and 7 communicate with the vent passage 8 which communicates with the bypass passage 4 during high-temperature tapping and low-temperature tapping, and the relief passage 8 is provided with a preset spring pressure. A slow ignition device for a mixing type water heater, characterized in that it is equipped with a relief valve 10 which is always biased in the closing direction by a spring 9 having the following characteristics.