JPH041260B2 - - 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 waterway 12 passing through the next chamber 10a is connected to the secondary chamber 1 through the communication passage 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 value shall be maintained at the value of . Bench lily 1 to adjust the hot water temperature
By using a throttle valve 2 installed in series with the throttle valve 2, the negative pressure of the negative pressure generating part is increased by setting the throttle valve 2 to a small opening, and the opening of the gas valve 15 is increased to increase the temperature of the tapped water. be. However, in the case shown in FIG. 5, 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.

Hot water outlet 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) In the conventional technology shown in Fig. 5, the primary and secondary chambers 10a with respect to the water supply amount , 10b is the characteristic of the pressure difference between
As shown in Fig. 7, it becomes a quadratic curve, and its overall slope is gentle when the throttle valve 2 is set at a large opening (low temperature T), and as the throttle valve 2 is closed (as the high temperature T is set). It gradually becomes steeper as shown by arrow X. In addition, in order to prevent gas leakage when the operation is stopped, the valve seat 1 is provided with a spring 15c.
Since it is necessary to increase the initial load of the valve body 15a against the valve body 5b, the gas valve 15 begins to open at the position of a considerably large pressure difference P1 as shown in FIG.
The gas valve 15 is set to be fully open at position P2.

Therefore, the operating characteristics of the gas valve operating device are as follows:
As shown in Fig. 6, when the throttle valve 2 is set at a small opening (set at a high temperature T), a straight line as shown by R is obtained, for example, and when the throttle valve 2 is set at a large opening (set at a low temperature T), a straight line becomes S. It has a nearly straight line characteristic with a slightly gentler slope than R as shown in . That is, hot water temperature High temperature T Low temperature t Minimum lift R1 S1 Maximum lift R2 S2 Although R2-R1<S2-S1, the ratio (S2-S1)/(R2-R1) is as shown in Figure 4 above. The ratio of (Q4-Q3)/(Q2-Q1) is much smaller.

For this reason, 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. 6. Settings (R1 is
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 high temperature t is set, 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 Fig. 6 (S1
is set to match Q3 and s2 to match Q4), then
When the high temperature T is set, the flow rate characteristic 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 the outlet temperature decreases to T' at the amount of water supply Q2'. As described above, in the conventional technique shown in FIG. 5, 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 form a primary chamber 10a and a secondary chamber 10b, as shown in FIGS. 1 to 4. death,
Negative pressure generating parts of bench lilies 20 and 40 provided in the water supply channel 12 passing through the primary chamber 10a are communicated with the secondary chamber 10b, and as the amount of water supply increases, the diaphragm 11
In the gas water heater, the opening degree of the gas valve 15 is continuously increased by the bending, and the amount of gas supplied to the gas burner is increased to maintain the outlet temperature at a predetermined value. is water supply channel 1
A tube portion 2 provided on the inner circumferential surface of 2 and having a narrowed inner surface.
1, 41, a valve part 22, 42 having a tapered shape and an outwardly convex profile in a vertical cross section, and a valve part 22, 42 disposed on the downstream side of the pipe part 21, 41 with its tip facing upstream. The valve parts 22, 42 are connected to the pipe parts 21, 41.
Spring 2 that elastically biases toward the inner surface of
3 and 43, and manual adjustment devices 25 and 45 for changing the biasing force of the springs.

[Effect]

As the amount of water supplied through the water supply channel 12 increases, the pressure difference across the bench lily 20 increases, so the valve parts 22 and 42 move against the urging force of the springs 23 and 43, but the manual adjustment devices 25 and 45 When the biasing force of the springs 23, 43 is increased (set to a high temperature), the valve portions 22, 43 move in the first half of the full stroke, and when the biasing force of the springs 23, 43 is decreased (set to a low temperature), the valve portions 22, 43 move. Sections 22, 42 move during the latter half of the full stroke. On the other hand, since the valve portions 22 and 42 have a tapered shape and have an outwardly convex profile in the vertical cross section, the rate of increase in the passage area between them and the pipe portions 21 and 41 for a predetermined small stroke is as follows. It is small in the first half of the stroke and large in the second half of the stroke. Therefore, bench lilies 20, 40 depending on the increase in water supply amount
The rate of increase in the passage area of the valve portions 22 and 4 is greater when the temperature is set to a lower temperature.
2 longitudinal contour cross-sectional shape and springs 23, 43
Since it can be adjusted by changing the temperature, the operating characteristics of each "water supply amount-lift" when set to high temperature and when set to low temperature can be adjusted independently from each other.

〔Effect of the invention〕

As described above, according to the present invention, the operating characteristics of each "water supply amount - lift" when set to a high temperature and when set to a low temperature can be adjusted independently of each other, so that high temperature hot water and low temperature hot water tap can be adjusted independently. In both cases, the operating characteristics can be brought close to the required characteristics. Therefore, in both cases of high-temperature and low-temperature tapping, the hot water temperature can be stabilized over almost the entire range of water supply amounts.

〔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.

The bench lily 20 consists of a pipe section 21, a valve section 22, and a manual adjustment device 25. The pipe section 21, whose inner surface is smoothly constricted at the center, is slid longitudinally onto the inner surface of the downstream passage 12a of the water supply channel 12 via a seal ring 26. The adjusting rod 25a and the connecting member 25 are movably fitted and supported.
The longitudinal position can be adjusted by a manual adjustment device 25 consisting of b. The valve portion 22 is inserted into the pipe portion 21 from the downstream side with its tapered tip facing upstream, and is supported so as to be movable in the longitudinal direction by a support member 24 fixed to the downstream passage 12a. The valve portion 22 is biased against the inner surface of the tube portion 21, and as the amount of water supplied increases, the spring 23 is bent, causing the valve portion 22 to retreat, thereby increasing the passage area between the valve portion 22 and the tube portion 21. Since the valve part 22 has a tapered shape and the contour shape of the vertical cross section is outwardly convex, the rate of increase in the passage area between the valve part 22 and the pipe part 21 for a predetermined small stroke is small in the first half of the stroke. Yes, and becomes large in the latter half of the stroke. Note that a relief hole 22a is provided at the center of the valve portion 22.
Negative pressure generating part of bench lily 20 and diaphragm chamber 1
The secondary chambers 0 are communicated through a communication passage 16, and the pressure difference between the primary chamber 10a and the secondary chamber 10b causes the valve body 15a of the gas valve 15 to be lifted against the biasing force of the spring 15c.

To set the tapping temperature to the high temperature T, the manual adjustment device 25 moves the tube section 21 downward, increasing the initial load of the spring 23 to increase the urging force that presses the valve section 22 against the inner surface of the tube section 21. The water supply amount is determined by a hot water tap installed in a part of the water supply channel 12 (not shown)
However, while the amount of water supplied is small, the gap between the pipe section 21 and the valve section 22 remains closed and the water flows only through the relief hole 22a, and the amount of water supplied increases until it reaches A1 or more in Fig. 3. If this occurs, the spring 23 is bent and the valve portion 22 is moved back, opening a gap between the valve portion 22 and the pipe portion 21 to increase the passage area of the bench lily 20. At the same time, both chambers 10a and 1 of the diaphragm chamber 10 are opened.
A pressure difference of 0b reaches a value that starts to open the gas valve 15. Characteristics a1 to a5 shown in FIG. 3 show the relationship between the water supply amount and the lift of the valve body 15a of the gas valve 15 when the passage area is different. Each characteristic moves in the first half of the stroke and the increase in passage area is small.
The pitch between a1 and a5 is small. In this way, the passage area of the bench lily 20 automatically increases as the amount of water supplied increases, but since the pitch of the characteristics a1 to a5 is small, the relationship between the lift of the valve body 15a and the amount of water supplied is sloped as shown in A. is relatively large. When the water supply amount reaches A1, the gas valve 15 opens and starts supplying the minimum amount of gas to the burner, and when the water supply amount reaches A2, it starts to supply the maximum amount of gas to the burner.
In the graph showing the relationship between the water supply amount and the hot water outlet temperature shown in FIG. The water supply amount Q2 at the intersection of
By selecting the shape of the base side (spring 23 side) of the vertical cross-sectional profile of the valve part 22 so that A2 almost matches, the operating characteristics on the high temperature side can be made to almost match the required characteristics, and the entire range of water supply amount can be achieved. The outlet temperature is maintained at an almost constant high temperature T.

To set the tapping temperature to the low temperature t, the manual adjustment device 25 moves the pipe section 21 upward, and the initial load of the spring 23 is reduced to reduce the urging force that presses the valve section 22 against the inner surface of the pipe section 21. When the amount of water supplied increases to a predetermined value larger than A1 in FIG.
After the passage area of 0 is increased and the amount of water supplied is further increased, the pressure difference between the two chambers 10a and 10b of the diaphragm chamber 10 reaches a value B1 at which the gas valve 15 starts to open.
Characteristics b1 to b5 shown in FIG. 3 show the relationship between the water supply amount and the lift of the valve body 15a of the gas valve 15 when the passage area is different. It moves in the latter half of , and the increase in passage area is large, so each characteristic b1 to b5
The gap between them is large. Therefore, in this case, the relationship between the lift of the valve body 15a and the amount of water supplied has a relatively small slope as shown in B. When the water supply amount reaches B1, the gas valve 15 opens and starts supplying the minimum amount of gas to the burner, and when the water supply amount reaches B2, it starts to supply the maximum amount of gas to the burner. In Fig. 4, B1 almost coincides with the water supply amount Q3 at the intersection of the low temperature outlet temperature t and the minimum capacity curve D, and B2 almost coincides with the water supply amount Q4 at the intersection with the maximum capacity curve C. The shape of the tip side of the vertical cross-sectional profile of the valve part 22 is selected so that the operating characteristics on the low temperature side almost match the required characteristics, and the outlet temperature is kept at a nearly matching low temperature t over the entire range of water supply amount. Try to maintain it.

According to the first embodiment, the valve portion 22
By selecting the contour shapes of the root and tip, the operating characteristics at high and low temperatures can be adjusted independently of each other, making it possible to meet the operating characteristics required for both high-temperature and low-temperature tapping. The hot water temperature can be brought close to the characteristics, and the hot water temperature will be stable over almost the entire range of water supply amount, whether hot water is hot or cold.

The second embodiment shown in FIG. 2 differs from the first embodiment only in the structure of the bench lily 40. The pipe portion 41 of the bench lily 40 is integrally provided on the inner peripheral surface of the downstream passage 12a, and the valve portion 42 is supported so as to be movable in the longitudinal direction by a manual adjustment device 45 consisting of an adjustment rod 45a, a connecting member 45b, and a support member 45c. The tip thereof is urged against the tube portion 41 by a spring 43. To set the hot water temperature at a high temperature T, move the manual adjustment device 45 upward, and to set it at a low temperature T, move the manual adjustment device 45 downward.
By increasing or decreasing the initial load of the spring 43, respectively, the passage area between the pipe portion 41 and the valve portion 42 for a certain amount of water supply is decreased or increased. The other operations are the same as those in the first embodiment, so a detailed explanation will be omitted.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the first embodiment of the hot water temperature control device for a gas water heater according to the present invention, Fig. 2 is an explanatory diagram of the second embodiment, and Fig. 3 is an explanatory diagram of the water supply amount and lift of each embodiment. Figure 4 is a graph of the water supply amount and hot water temperature of the gas water heater, Figure 5 is an explanatory diagram of the conventional technology,
FIG. 6 is a graph of water supply amount and lift in the prior art, and FIG. 7 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, 12... Water supply channel, 15...Gas valve, 2
0,40... Bench lily, 21,41... tube part,
22, 42... Valve section, 25, 45... Manual adjustment device.

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 provided in the water supply channel passing through the primary chamber is communicated with the secondary chamber to increase the amount of water supplied. In the gas water heater, the diaphragm is deflected as the diaphragm is bent, and the opening degree of the gas valve is continuously increased by this deflection, and the amount of gas supplied to the gas burner is increased to maintain the outlet temperature at a predetermined value. a pipe portion provided on the inner circumferential surface of the water supply channel and having a narrowed inner surface; a valve portion having a tapered shape and a vertical cross-sectional profile convex outward;
A spring that elastically biases the valve portion disposed on the downstream side of the tube portion with its tip facing upstream toward the inner surface of the tube portion, and a manual adjustment device that changes the biasing force of this spring. A hot water temperature control device for a gas water heater characterized by: