JPS6172923A - Hot water temperature adjusting device for gas water heater - Google Patents

Abstract

PURPOSE:To provide a stable hot water temperature over a substantial entire range of water volume to be supplied in a hot temperature and a low temperature hot water by a method wherein a passage area between the pipe of a venturi and a valve is automatically increased or manually varied. CONSTITUTION:In order to set water temperature to a high temperature T, a pipe 21 is positioned at a lower part by a manual adjusting device 25 and the initial load of a spring 23 is high. During a time in which a less amount of water is used. The fed water is flowed only through the through-pass hole 22a. As the amount of water fed is increased, the spring 23 is flexed and a valve 22 is retracted and the passage area of a venturi 20 is increased. When the amount of water fed is reached to A1, a gas valve 15 is opened and a minimum amount of gas is supplied to a burner and if the amount of water fed is reached to A2, the maximum amount of gas is supplied to the burner. The temperature of the hot water is kept at a substantial constant high temperature T within a substantial entire range A1-A2 of the amount of water fed. A setting of the low temperature (t) is performed by positioning the pipe 21 at the upper position. When the amount of water fed is reached to B1, the gas valve 15 is opened, the minimum volume of gas is supplied to the burner and if it is reached to a value B2. the maximum volume of gas is supplied. It is possible to keep the temperature of hot water at a substantial constant low temperature (t) in a substantial entire range of B1-B2 of the amount of water fed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a gas in which the temperature difference between the supply water temperature and the outlet/A temperature (hereinafter simply referred to as outlet hot water 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 water heater.

[Prior art]

A conventional hot water temperature control device of this type is shown in FIG. This allows the negative pressure generating part of the venturi 1 provided in the water supply channel 12 that passes through the first firebox 10a of the diaphragm chamber 10 to be communicated with the second firebox 10b through a communication passage 16 to deflect the diaphragm 11 in accordance with the increase in the amount of water supplied. The lift of the valve body 15a of the gas valve 15 (hereinafter simply referred to as lift) is continuously changed to control the gas supply amount and maintain the tapping temperature at a predetermined value. A throttle valve 2 installed in series with the venturi 1 is used to adjust the tapping temperature, 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. As a result, the temperature increases. However, the one shown in FIG. 6 was unable to provide 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 despite increases and decreases in the amount of water supplied, the characteristic of "water supply amount - lift" given by the gas valve actuation device (Venturi 1 and diaphragm 11) (
operating characteristics) and the characteristics of "water supply amount - gas flow M (this is proportional to lift)" necessary to keep the hot water temperature constant (
(required characteristics) must be made to almost match regardless of the tapping temperature. Figure 5 is a graph of the water supply amount and outlet temperature of a gas water heater, where C is the maximum capacity (maximum gas flow rate, maximum lift) and D is the minimum capacity (minimum gas flow rate, minimum lift).
This is the line that shows. As understood from FIG. 5, the required characteristics of "water supply amount - lift" are as follows.

Tapping temperature High temperature T Low temperature t Minimum lift QI Q3 Maximum lift Q2 Q4 Q2-Ql<Q4-Q3 (Since curves C and D are hyperbolas) However, in the conventional technology shown in Fig. 6, the operating characteristic is the seventh
As shown in the figure, when the throttle valve 2 is set to a small opening (cent at high temperature T), it becomes R (or r), and the throttle valve 2 is set to a large opening (
cent) at low temperature t), S (or S) is almost parallel to R (or r), and is as follows.

Hot water outlet temperature High temperature T Low temperature t Minimum lift RI Sl Maximum lift R252 R2-R1-S2-3l Therefore, in the conventional technology shown in Fig. 6, when the hot water temperature is set to high temperature T, the predetermined outlet temperature is maintained even if the water supply amount is changed. If the flow characteristics (operating characteristics) of venturi 1 and throttle valve 2 are set to R in Figure 7 (set R1 to Ql and R2 to Q2) so that The characteristic is S, and Sl is Q3, but S2 is a smaller value than Q4, so as the water supply increases, the hot water temperature rises, and when the low temperature t is set, the predetermined hot water temperature is maintained. Set the flow rate characteristic to S in Figure 7 (S
(setting l to Q3 and s2 to Q4), the flow rate characteristic when set to high temperature T becomes r, and R1 becomes Q
1, but R2 has a larger value than Q4, so as the amount of water supplied increases, the hot water temperature decreases, making it impossible to obtain hot water at a stable temperature at both high and low temperatures.

[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]

As shown in FIGS. 1 to 3, the present invention provides a venturi 20, 30, 40 provided in a water supply channel 12 passing through one firebox 10a.
The negative pressure generating part of the is communicated with the second firebox 10b, the diaphragm 11 is bent as the amount of water supplied increases, and the opening degree of the gas valve 15 is continuously changed to control the amount of gas supplied, and the hot water temperature is maintained at a predetermined level. It is intended for use with gas 4 boilers that maintain the value of
The venturi 20, 30.40 is inserted into the pipe section 21, 31.41 whose intermediate inner surface is smoothly constricted, and automatically moves along the water supply channel 12 as the amount of water supplied increases. 21.31.41 and a tapered valve section 22.32.42 which increases the passage area between the tube section 2 along the longitudinal direction.
1, 31.41 and the valve portion 22.32.42 and moves along the longitudinal direction to change the passage area between the two at a constant water supply amount 25. 35.45.

[Effect]

As the amount of water supply increases, the valve parts 22, 32, 42 automatically move 8, the negative pressure generated in the negative pressure generating part of the venturi 20, 30, 40 gradually increases, the diaphragm 11 gradually bends, and the gas valve 15 The valve body 15a is gradually lifted and opened (so that an amount of gas corresponding to the increase in the amount of water supplied is supplied to the burner. To set the hot water temperature to a high temperature, turn the manual adjustment device 25° 35.45 in one direction. (The one in Fig. 1 is moved downward, and the one in Figs. 2 and 3 is moved upward) and the pipe part 21
．． 31.41. To reduce the passage area between the valve section 22, 32.42 and set the outlet temperature to a low temperature, move the manual adjustment device 25, 35.45 in the opposite direction.
．． The passage area between 31.41 and the valve portions 22, 32.42 is increased. The relationship between water supply amount and lift is as shown in Fig. 4. When the manual adjustment devices 25 and 35.45 are set to high temperature, the characteristic is A, and the water supply amount corresponding to the minimum and maximum lift is A1 and A2, respectively. The characteristic when the temperature is set to low temperature is B, and the water supply amounts corresponding to the minimum and maximum lift are Bl and B2, respectively. The width of change A2-Al in the amount of water supplied in the case of high-temperature setting is smaller than the width of change B2-B1 in the amount of water supplied in the case of low-temperature setting.

〔Effect of the invention〕

In the present invention, the valve part of the venturi is automatically moved as the supply amount increases to increase the passage area with the pipe part, so it is easy to obtain a venturi with desired flow characteristics. In addition to the above-mentioned automatic increase, the outlet temperature is adjusted by manually changing the passage area between the venturi tube and the valve using a manual adjustment device that moves along the longitudinal direction. The range of increase/decrease in the amount of water supplied when set to high temperature is smaller than when set to low temperature. Therefore, the operating characteristics can be brought close to the required characteristics in both high temperature and low temperature hot water supply, and the amount of water supplied can be adjusted according to changes in the amount of water supplied. An appropriate amount of gas is supplied, and the hot water temperature can be stabilized over almost the entire range of water supply.

〔Example〕

FIG. 1 shows a first embodiment of the present invention, in which a diaphragm chamber 10' is partitioned by a diaphragm 11, and one firebox 10a is divided into two.
and two fire chambers 10b are formed, and a venturi 20 is provided in the downstream passage 12a of the water supply channel 12 that passes through the first fire chamber IQa. A valve body 15 is provided in the gas supply path 13 to the gas burner (not shown).
A is provided with a gas valve 15 in which the valve yi15b is biased by a spring 15c, 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. Link.

The venturi 20 includes a pipe section 21, a valve section 22, and a manual adjustment device 2.
5, the pipe portion 21 with a smoothly constricted inner surface at the center is fitted and supported on the inner surface of the downstream channel 12a of the water supply channel 12 so as to be slidable in the longitudinal direction via a seal ring 26, and the adjusting rod 2
The longitudinal position can be adjusted by a manual adjustment device 25 consisting of a connecting member 5a and a connecting member 25b. The valve part 22 is inserted into the pipe part 21 with the tapered tip facing upstream, and the downstream passage 1
The distal end of the valve part 22 is urged against the inner surface of the pipe part 21 by a spring 23, and as the amount of water supplied increases, the spring 23 springs and closes the valve. The portion 22 is retracted to increase the passage area between the tube portion 21 and the tube portion 21. Note that a relief hole 22a is provided at the center of the valve portion 22. The negative pressure generating part of the venturi 20 and the secondary chamber of the diaphragm chamber 10 communicate with each other through a communication passage 16, and the pressure difference between the first fire chamber 10a and the second fire chamber 10b causes gas to flow against the biasing force of the spring 15C. The valve body 15a of the valve 15 is lifted.

In order to set the output temperature to the high temperature T, the manual adjustment device 25 is used to position the tube portion 21 on the lower side, and the initial load of the spring 23 is increased. While the water supply amount of the water supply channel 12 is small, the gap between the pipe section 21 and the valve section 22 is closed, and the water supply is carried out through the escape hole 22.
Only spring a flows, but as the water supply increases, spring 2
3 is bent, the valve part 22 retreats, and a gap between the valve part 22 and the pipe part 21 is opened, thereby increasing the passage area of the ventu 'J 20. A1 to a5 shown in FIG. 4 respectively 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. As the water supply amount increases, the spring 23 gradually bends. Since the passage area of the venturi 20 automatically increases, the relationship between the water supply amount and the lift of the valve body 15a becomes as shown in A. That is, 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, the maximum amount of gas is supplied to the burner. In the graph showing the relationship between the water supply amount and the hot water outlet temperature shown in FIG. The characteristics of the venturi 20 are selected so that A2 almost matches the water supply iQ2 at the intersection, and the operating characteristics almost match the required characteristics, and almost the entire range of water supply amount A1 ~
A2 maintains the hot water temperature at a constant high temperature T.

In order to set the tapping temperature to the low temperature t, the manual adjustment device 25 is used to position the pipe portion 21 on the upper side, and the initial load of the spring 23 is reduced. The pipe section 2 for the flow rate formed by this
1 and the valve portion 22, that is, the passage area of the venturi 20 becomes larger than in the case of the high temperature T, and the amount of water supply required to give a predetermined lift to the valve body 15a increases. Therefore, the relationship between the water supply amount and the lift is as shown in B in Figure 4. When the water supply amount reaches 31, the gas valve 15 opens and starts supplying the minimum amount of gas to the burner, and when the water supply amount reaches 82, the maximum amount gas will be supplied to the burner. As mentioned above, the passage area of the venturi 20 for each flow rate is larger than that in the case of high temperature T, so the amount of water supplied in each passage area and the valve body IS
The relationship bl-b5 with the lift of a has a smaller slope than the above-mentioned a1 to a5, so B has a smaller slope than A, and A2-At<82-Bl. Therefore, the high temperature T
Even if the characteristics of the venturi 20 are selected so that A1'', Ql, A2 = Q2 at low temperatures, the characteristics of the manual adjustment device 25 are selected so that B1 = Q3.B2 = Q4 at low temperatures to adjust the operating characteristics. It can almost match the required characteristics, and almost the entire range of water supply amount B1-B
2, the output mA degree can be maintained at a constant low temperature.

The second embodiment shown in FIG. 2 differs from the first embodiment only in the structure of the venturi 30. The pipe portion 31 of the Hentsch IJ 30 has a smoothly constricted inner surface at the center, is fitted and supported on the inner surface of the downstream channel 12a of the water supply channel 12 so as to be slidable in the longitudinal direction via a seal ring 36, and is connected to the adjustment rod 35a and the connecting member. The longitudinal position can be adjusted by a manual adjustment device 35 consisting of 35b. The valve part 32 is inserted into the pipe part 31 with the tapered tip facing upstream, and is fixed to the diaphragm 11, and as the diaphragm 11 bends as the amount of water supplied increases, the valve part 32 is retracted and the valve part 32 is inserted between the pipe part 31 and the valve part 32. The area of the passageway has been increased. The negative pressure generating portion of the venturi 30 and the two fire chambers 10b of the diaphragm chamber 10 communicate with each other through a communication hole 31a, an annular groove 31b, and a communication passage 16. To set the hot water temperature at a high temperature T, the pipe section 31 is placed on the upper side using the manual adjustment device 35, and to set it at a low temperature T, the pipe section 31 is placed on the lower side. Decrease or increase the passage area between. The other operations are the same as those in the first embodiment, so a detailed explanation will be omitted.

In the third embodiment shown in FIG. 3, the structure of the venturi 40 is the same.
This embodiment is only different from the second embodiment. The pipe portion 41 of the venturi 40 is integrally provided in the downstream portion 12a of the water supply channel 12, 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 tapping temperature to a high temperature T, the manual adjustment device 45 is placed on the upper side, and to set it to a low temperature T, the manual adjustment device 45 is placed on the bottom side, and the initial load of the spring 43 is increased or decreased, respectively. , the passage area between the pipe section 41 and the valve section 42 is reduced or increased for the amount of water supplied. The other operations are the same as those in the first embodiment, so a detailed explanation will be omitted.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of the first to third embodiments of the present invention, respectively, and FIG. 4 is a graph of water supply amount and lift of each embodiment,
Figure 5 is a graph of the water supply amount and hot water temperature for a gas water heater.
The figure is an explanatory diagram of the prior art, and FIG. 7 is a graph of the water supply amount and lift of the prior art. Explanation of symbols 10...Diaplum chamber, 10a...Primary chamber, 10
b...Secondary chamber, 11...Diaphragm, 12...
Water supply channel, 15...Gas valve, 20°30.40...Henturi, 21.31.41...Pipe portion, 22,32.
42...Valve section, 25°35.45...Manual adjustment device.

Claims (1)

[Claims] The inside of the diaphragm chamber is partitioned by a diaphragm.
A negative pressure generating part of a bench lily installed in a water supply channel that forms a next chamber and a secondary chamber and passes through the primary chamber is communicated with the secondary chamber, and as the amount of water supplied increases, the diaphragm is deflected. In a gas water heater that continuously changes the opening degree of the gas valve to control the amount of gas supplied to the gas burner to maintain the outlet temperature at a predetermined value, the bench lily is a pipe with a smoothly constricted inner surface in the middle part. a tapered valve part that is inserted into the pipe part and automatically moves along the water supply channel as the amount of water supplied increases to increase the passage area between the pipe part and the valve part; A hot water outlet temperature regulating device comprising a manual adjusting device connected to at least one of the pipes and moving along the longitudinal direction to change the passage area between the pipe portion and the valve portion at a constant water supply amount.