JPH041261B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a gas water boiler in which the temperature difference between the supply water temperature and the hot water outlet temperature (hereinafter simply referred to as the hot water outlet temperature) is maintained at a predetermined value even if the amount of water supply is increased or decreased. The present invention relates to a hot water temperature adjustment device in a vessel.

[Prior art]

A conventional hot water temperature control device of this type is shown in FIG. This is 1 of 10 diaphragm chambers
The negative pressure generating part of the bench lily 1 provided in the water supply channel 12 through which the next chamber 10a passes is connected to the secondary chamber 1 through the communication path 16.
0b, the diaphragm 11 is bent in accordance with the increase in the water supply amount, and the lift (hereinafter simply referred to as lift) of the valve body 15a of the gas valve 15 is continuously changed to control the gas supply amount and keep the hot water outlet temperature at a predetermined level. The temperature is maintained at . To adjust the hot water temperature, a throttle valve 2 installed in series with the bench lily 1 is used, and by setting the throttle valve 2 to a small opening, the negative pressure in the negative pressure generating section is increased, and the opening of the gas valve 15 is increased. This increases the hot water temperature. However, in the case shown in FIG. 6, it was not possible to obtain hot water at a stable temperature at both high and low temperatures, regardless of the increase or decrease in the amount of water supplied.

In order to obtain hot water at a stable temperature regardless of the increase or decrease in the amount of water supplied, a gas valve operating device (bench lily 1) is required.
and diaphragm 11), and the characteristics (operating characteristics) of "water supply amount - gas flow rate (this is proportional to lift)" necessary to keep the hot water temperature constant (required). It is necessary to make the characteristics (characteristics) almost the same for any tapping temperature. Figure 4 is a graph of the water supply amount and hot water temperature of a gas water heater, where C is the maximum capacity (maximum gas flow rate,
D is the minimum capacity (minimum gas flow rate,
This line shows the minimum lift. As understood from FIG. 4, the required characteristics of "water supply amount - lift" are as follows.

Tapping temperature High temperature T Low temperature t Minimum lift Q1 Q3 Maximum lift Q2 Q4 Q2−Q1<Q4−Q3 (Since curves C and D are hyperbolas) Figure 5 illustrates this required characteristic.
As is clear from Q2-Q1<Q4-Q3, the slope of the required characteristic B during low-temperature tapping is considerably gentler than that of the required characteristic A during high-temperature tapping.

On the other hand, in the prior art shown in FIG. 6, the characteristics of the pressure difference between the primary and secondary chambers 10a, 10b with respect to the water supply amount are quadratic curves as shown in FIG.
The overall gradient is gentle when the throttle valve 2 is set at a large opening (set at a low temperature t), and gradually becomes steeper as shown by the arrow X as the throttle valve 2 is throttled down (as the temperature is set at a high temperature T). In addition, in order to prevent gas leakage when the operation is stopped, it is necessary to increase the initial load of the valve body 15a against the valve seat 15b by the spring 15c. The gas valve 15 starts to open at the pressure difference P2, and the gas valve 15 is fully opened at the position of the pressure difference P2.

Therefore, the operating characteristics of the gas valve operating device are as follows:
As shown in Fig. 7, when the throttle valve 2 is set at a small opening (set at a high temperature T), it becomes a nearly straight line as shown by R, and when the throttle valve 2 is set at a large opening (set at a low temperature t), it becomes S. It has a nearly straight line characteristic with a slightly gentler slope than R as shown in . In other words, the amount of water supplied in each case is: Hot water temperature High temperature T Low temperature T Lift minimum R1 S1 Lift maximum R2 S2 Although R2-R1<S2-S1, the ratio (S2-S1)/(R2-R1) is The ratio (Q4−Q3)/(Q2−
It will be much smaller than Q1).

Therefore, when the high temperature T is set, the characteristics of the bench lily 1, the throttle valve 2, the spring 15c, etc. are adjusted so that the predetermined hot water temperature is maintained even if the water supply amount is changed, and the operating characteristics are set to R in Fig. 7. Settings (R1
set Q1 and R2 to match Q2), then
The flow rate characteristic when set at low temperature t is S,
If the water supply amount S1 at the minimum lift of the valve body 15a is made equal to Q3, the water supply amount S2 at the maximum lift becomes a value Q4' smaller than Q4. Therefore, when the temperature is set to low temperature t, the outlet temperature rises as the water supply increases, as shown by the two-dot chain line at the bottom of Figure 4, and the water supply increases.
At Q4′, the temperature of the hot water at the outlet rises to t′.

In addition, when the temperature is set to low temperature t, the characteristics of each part are adjusted so that the predetermined hot water temperature is maintained even if the water supply amount is changed, and the operating characteristics are set to s in Figure 7 (S1
is set to match Q3 and s2 to match Q4), then
The flow rate characteristic when set to high temperature T is r,
If the water supply amount R1 at the minimum lift of the valve body 15a is made equal to Q1, the water supply amount r2 at the maximum lift becomes a value Q2' larger than Q2. Therefore, as shown by the two-dot chain line in the upper part of FIG. 4, the outlet temperature decreases as the amount of water supply increases, and drops to the outlet temperature T' at the amount of water supply Q2'. As described above, in the conventional technique shown in FIG. 6, it was possible to obtain hot water at a stable temperature only in either high-temperature tap or low-temperature tap.

[Problem that the invention seeks to solve]

In this type of gas water heater, the present invention improves the device that generates negative pressure to be applied to the secondary chamber of the diaphragm chamber, thereby nearly matching the operating characteristics and required characteristics in both high-temperature and low-temperature tapping. The aim is to stabilize the hot water temperature over almost the entire range of water supply.

[Means for solving problems]

For this purpose, the hot water temperature control device for a gas water heater according to the present invention partitions the inside of a diaphragm chamber 10 with a diaphragm 11 to separate a primary chamber 10a and a secondary chamber 10b, as illustrated in FIGS. 1 to 5. The negative pressure generating part of the bench lily 20 provided on the downstream side of the primary chamber of the water supply channel 12 passing through the primary chamber 10a is communicated with the secondary chamber 10b through the communication passage 16 to increase the amount of water supplied. bend the diaphragm 11,
In a gas water heater that continuously increases the opening degree of the gas valve 15 by this bending, increasing the amount of gas supplied to the gas burner and maintaining the outlet temperature at a predetermined value,
A tapered throttle piece 26 coaxially fixed to the diaphragm 11 is inserted into the bypass passage 12b provided in parallel with the bench lily 20, so that the passage area of the bypass passage 12b is automatically increased as the amount of water supplied increases. automatic diaphragm device 25 and the water supply channel 12
second throttle valves 30 and 31 that are provided downstream of the primary chamber 10a and adjust the outlet temperature by changing the negative pressure generated in the negative pressure generating section according to the amount of water supplied;
The intermediate branch point 16b of the communicating path 16 is connected between the primary chamber 10a and the bench lily 20 or between the primary chamber 1
A branch passage 17 communicating with Oa and a part of this branch passage 17 are provided and are manually operated in conjunction with the second throttle valves 30 and 31 so that the opening degree increases as the tapping temperature is set to a low temperature. It is characterized in that it includes a first throttle valve 32.

[Effect]

By adjusting the second throttle valves 30 and 31, the negative pressure generated in the negative pressure generating portion of the bench lily 20 changes depending on the amount of water supplied, so the lift of the gas valve 15 changes, and thereby the outlet temperature changes. Second throttle valve 3
0 and 31 are constant, the lift of the gas valve 15 increases as the amount of water supplied increases, increasing the amount of gas supplied.

As the amount of water supplied through the water supply channel 12 increases, the tapered throttle piece 26 fixed to the diaphragm 11 moves back to increase the opening degree of the automatic throttle device 25, thereby increasing the opening of the bench lily 20 for the flow rate passing through the automatic throttle device 25. The characteristics of the lift of the gas valve 15 with respect to the amount of water supplied changes because the ratio of the flow rate passing therethrough decreases. By adjusting the shape of this throttle piece 26 with the first throttle valve 32 at the minimum or fully closed position,
Match high-temperature operating characteristics to high-temperature required characteristics.

Furthermore, if the opening degree of the first throttle valve 32 is increased, the pressure at the branch point 16b communicating with the secondary chamber 10b of the diaphragm chamber 10 will be increased accordingly.
Since the pressure in the negative pressure generating section approaches the pressure in the primary chamber 10a, the lift of the gas valve 15 decreases.

Since the first throttle valve 32 is operated in conjunction with the second throttle valves 30 and 31 so that the opening degree increases as the outlet temperature decreases, the opening degree of the first throttle valve 32 is at the minimum or fully closed. The operating characteristics during hot water tapping at a high temperature match the required high temperature characteristics, and the operating characteristics during hot water tapping at a low temperature where the opening degree of the first throttle valve 32 is the above-mentioned adjustment value match the required low temperature characteristics.

〔Effect of the invention〕

As described above, according to the present invention, the operating characteristics during high-temperature tapping and low-temperature tapping match the required high-temperature and low-temperature characteristics, respectively, so almost the entire range of water supply amount can be achieved in both high-temperature and low-temperature tapping. The hot water temperature can be stabilized.

〔Example〕

FIG. 1 shows a first embodiment of the present invention, in which a diaphragm chamber 10 is partitioned by a diaphragm 11 to form a primary chamber 10a and a secondary chamber 10b.
A bench lily 20 is provided on the downstream path 12a of the water supply channel 12 passing through the water supply channel 0a. Gas burner (not shown)
In the gas supply path 13 to
5 is provided, and the diaphragm 11 and the valve body 15a are connected by a rod 14 so that the valve body 15a lifts and opens the gas valve 15 in accordance with the deflection of the diaphragm 11. One end 16 is connected to the negative pressure generating part of the bench lily 20.
The bench lily 20 communicates with the secondary chamber 10b of the diaphragm chamber 10 through a communication passage 16 with opening a, and 1
Due to the pressure difference between the next chamber 10a and the secondary chamber 10b, the valve body 15a of the gas valve 15 is lifted against the biasing force of the spring 15c.

The middle branch point 16b of the communication path 16 is connected to the primary chamber 10.
A first throttle valve 32 is provided in the middle of the branch passage 17 that communicates with the opening 17a between the opening 17a and the bench lily 20. Branch point 16b communicating with the secondary chamber 10b
The pressure of is equal to the pressure of the negative pressure generating part of the bench lily 20 and 1
The pressure within the next chamber 10a is between. That is, when the first throttle valve 32 is fully closed, the pressure in the secondary chamber 10b becomes the pressure in the negative pressure generating section, and as the first throttle valve 32 is opened, the pressure in the opening 17a (substantially the pressure in the primary chamber 10a) increases. internal pressure). The opening 17a of the branch path 17 may be provided in the primary chamber 10a.

In this embodiment, an automatic throttle device 25 and a second throttle valve 31 are provided in the bypass passage 12b formed in parallel with the bench lily 20. The automatic throttle device 25 consists of a tapered throttle piece 26 fixed at the center of the diaphragm 11 and a throttle ring 27 provided in the bypass passage 12b, and the throttle piece 26 automatically retracts ( 1), and automatically increases the area of the passage formed between it and the aperture ring 27. The second throttle valve 31 is composed of common valve elements with the automatic throttle device 25, that is, a throttle piece 26 and a throttle ring 27.
7 is a bypass passage 12 via a seal ring 27a.
Longitudinal direction (vertical direction in Figure 1) on the inner surface of b
It is slidably fitted and supported and is slid by an adjustment rod 31a to increase or decrease the passage area between the throttle piece 26 and the throttle piece 26 independently of the operation of the throttle piece 26. The first throttle valve 32 and the second throttle valve 31 are manually controlled in conjunction with each other so as to simultaneously increase or decrease their passage areas, thereby adjusting the outlet temperature.

The second throttle valve 31 changes the "water supply amount-lift" characteristic by changing the flow rate ratio of the bench lily to the bench lily 20 (flow rate of the bench lily 20/flow rate of the automatic throttle device 25), thereby changing the outlet temperature. That is, the throttle tube 27 is connected to the upper side (the primary chamber 10 in FIG. 1) via the adjustment rod 31a.
If the passage area of the second throttle valve 31 is made smaller by moving it to the a side), the flow rate ratio of the bench lily 20 increases (the bench lily flow rate ratio increases), and the negative pressure generating part of the bench lily 20 increases in proportion to the water supply amount. As the negative pressure increases and the opening degree of the gas valve 15 increases, the hot water temperature becomes high temperature T. Conversely, if the throttle pipe 27 is moved downward to increase the passage area of the second throttle valve 31, the hot water tap temperature increases. The temperature becomes low temperature t.

Tapered aperture piece 2 fixed to diaphragm 11
6 moves backward as the amount of water supplied increases, and the passage area of the automatic throttle device 25 increases, reducing the vent lily flow rate ratio.However, when the temperature T is set, the cross-sectional area decreases at a smaller rate on the root side of the throttle piece 26. Since the passage area of the automatic throttle device 25 is controlled by the throttle pipe 27, the vent lily flow rate gradually decreases as the amount of water supplied increases, as shown at o in FIG. 3a. In addition, when the temperature is set to a low temperature t, the cross-sectional area decreases at a large rate on the tip side of the throttle piece 26 and the throttle tube 2.
Since the passage area of the automatic throttle device 25 is controlled by 7, the vent lily flow rate decreases overall as shown at p in FIG. 3a, and also decreases somewhat quickly. In this way, in this embodiment, the bench lily flow rate ratio decreases as the water supply amount increases, and the rate of decrease is greater when the temperature is set to low temperature t.
The operating characteristics of "water supply amount - lift" are bypass path 12
b and the second throttle valve 31 is not used in the prior art, and as shown in FIG.
The slope is gentler than that of . By adjusting the shape of the throttle piece 26 at the tip, the high temperature operating characteristic O can be made to match the high temperature required characteristic A shown in FIG. However, it is virtually impossible to make the low-temperature operating characteristic P match the required low-temperature characteristic B simply by adjusting the shape of the throttle piece 26.

The above description is based on the state in which the first throttle valve 32 is closed. However, when the first throttle valve 32 is opened, the pressure in the secondary chamber 10b increases as described above as the degree of opening increases. 10a, the lift of the valve body 15a decreases. That is, when the first throttle valve 32 is opened, the slopes of the characteristics O and P decrease as shown by the broken lines O' and P' in FIG. 3b, and the degree of this decrease is equal to the first
It increases as the opening degree of the throttle valve 32 increases. Therefore, by appropriately adjusting this opening degree, the low temperature operating characteristic P' can be made to match the low temperature required characteristic B in FIG.

The second throttle valve 31 and the first throttle valve 32 are configured such that the opening degree of the second throttle valve 31 is the minimum, that is, the outlet hot water temperature is set to a high temperature T.
In this state, the first throttle valve 32 is closed, and as the opening of the second throttle valve 31 increases, the opening of the first throttle valve 32 is also increased, so that the opening of the second throttle valve 31 is at the maximum, that is, the temperature of the tapped water is reached. When the temperature is at low temperature t, the first throttle valve 32 is operated in conjunction with each other so that the opening degree of the first throttle valve 32 is obtained such that the low temperature operating characteristic P' matches the low temperature required characteristic B. As a result, the high-temperature operating characteristic O becomes the high-temperature required characteristic A.
Since the low-temperature operating characteristic P' coincides with the low-temperature required characteristic B, the tapped water temperature is stable over almost the entire range of water supply amount, whether hot water is tapped at a high temperature or at a low temperature.

In the second embodiment shown in FIG.
0a side, one end of the branch path 17 is connected to the primary chamber 1.
0a and the second throttle valve 30, except that the automatic throttle device 25 is constituted by a tapered throttle piece 26 fixed to the diaphragm 11 and an opening of the bypass passage 12b to the primary chamber 10a. It has the same structure as the first embodiment.

In this second embodiment, when the second throttle valve 30 is throttled, the negative pressure in the negative pressure generating part of the bench lily 20 increases in comparison to the water supply amount, and the opening degree of the gas valve 15 increases, so that the high temperature T is set. Conversely, if the second throttle valve 30 is opened, the temperature is set to the low temperature t. Further, as in the first embodiment, the throttle piece 26 fixed to the diaphragm 11 retreats as the amount of water supplied increases, the passage area of the automatic throttle device 25 increases, and the vent lily flow rate decreases. As in the first embodiment, the tapered aperture piece 26
The shape of is adjusted so that the high temperature operating characteristic O matches the high temperature required characteristic A in FIG.

Also in this second embodiment, when the first throttle valve 32 is opened, the pressure in the secondary chamber 10b approaches the pressure in the primary chamber 10a as the opening degree increases. The slopes of O and P decrease, and the degree of this decrease increases as the opening degree of the first throttle valve 32 increases. By appropriately adjusting this opening degree, the low-temperature operating characteristic P' with a reduced slope can be made to match the low-temperature required characteristic B in FIG.

In this second embodiment as well, the second throttle valve 30 is
When the temperature is set to t, the first throttle valve 32 is closed and the opening degree of the second throttle valve 30 is also reduced. When the second throttle valve 30 is set to the low temperature t, the first throttle valve 3 is closed.
2 and the second throttle valve 30 to open both throttle valves 3.
By operating 0 and 32 in conjunction, it is possible to make the high-temperature operating characteristic O match the high-temperature required characteristic A, and the low-temperature operating characteristic P' to match the low-temperature operating characteristic B. This makes it possible to match the high-temperature operating characteristic O with the high-temperature required characteristic A, and the low-temperature operating characteristic P' with the low-temperature operating characteristic B. In either case, the hot water temperature remains stable over almost the entire range of water supply. For other operations, please refer to 1.
Since this is the same as the embodiment, detailed explanation will be omitted.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the hot water outlet temperature control device for a gas water heater according to the present invention, FIG. 2 is an explanatory diagram of the second embodiment, and FIGS. 3a and 3b are diagrams of a second throttle valve. Fig. 4 is a graph of the water supply amount and hot water temperature of the gas water heater, Fig. 5 is a graph of required characteristics, Fig. 6 is an explanatory diagram of the conventional technology, and Fig. 7 is the water supply amount of the conventional technology. Figure 8 is a graph of water supply amount and pressure difference applied to the diaphragm. Explanation of symbols 10...Diaphragm chamber, 10a...
Primary chamber, 10b...Secondary chamber, 11...Diaphragm,
DESCRIPTION OF SYMBOLS 12... Water supply channel, 12a... Downstream path, 12b... Bypass path, 15... Gas valve, 16... Communication path, 16b... Branch point, 17... Branch path, 20... Bench lily, 26...
Throttle piece, 30, 31...second throttle valve, 32...first throttle valve.

Claims (1)

[Claims] 1 The inside of the diaphragm chamber is partitioned by a diaphragm to form a primary chamber and a secondary chamber, and the negative pressure generating part of the bench lily installed downstream of the primary chamber of the water supply passage passing through the primary chamber is connected to the negative pressure generating part of the chamber through a communication passage. The diaphragm is deflected as the water supply channel increases as it communicates with the secondary chamber, and this deflection causes the opening of the gas valve to continuously increase, increasing the amount of gas supplied to the gas burner and keeping the hot water temperature at a predetermined value. In gas water heaters maintained at
an automatic throttling device that inserts a tapered throttle piece coaxially fixed to the diaphragm into a bypass passage provided in parallel with the bench lily, and automatically increases the passage area of the bypass passage as the amount of water supplied increases; , a second throttle valve that is provided on the downstream side of the primary chamber of the water supply channel and adjusts the outlet temperature by changing the negative pressure generated in the negative pressure generating section according to the water supply amount; and a branch in the middle of the communication channel. a branch passage connecting a point between the primary chamber and the bench lily or to the primary chamber, and a second throttle valve provided in a part of the branch passage so as to increase the opening degree as the tapping temperature is set to a low temperature. 1. A hot water outlet temperature control device for a gas water heater, comprising a first throttle valve that is manually operated in conjunction with the first throttle valve.