JPH0462334A - Hot water supply system - Google Patents

Abstract

PURPOSE:To prevent a drop in a water level in a hot water supply tank by installing a flow rate control valve to the downstream side of a hot water supply pump, a water level sensor to said hot water supply tank, and inhibiting the amount of hot water supply when a detected water level falls below a predetermined hot water supply amount change over level. CONSTITUTION:When the amount of hot water supply from a water supply tank 14 exceeds the amount of hot water supplied from a hot water supply heater 19, and the water level in the hot water supply tank 14 drops, the drop is detected by a water level sensor 14b, which changes over the supply amount of hot water where hot water supply change over operation rotates a flow rate control valve 46 from full opening position to reference position, throttles the flow rate per two seconds and detects the water level in the hot water supply tank 14. When the water level drops, the flow rate control valve 46 is rotated in a direction to close the valve for 0.2 second. When the water level fails to drop, the flow rate control valve 46 is maintained to keep its reference position. The amount of hot water thus supplied can be inhibited by repeating such operation. When the water level arrives at the level which allows a water supply pump 32 for the hot water supply heater to drive, the flow rate control valve 46 is full opened. This construction makes it possible to fix a water level in the hot water tank 14 under the control action stated above.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hot water supply system used for a hot water source that requires a large amount of hot water at once, such as a shower device or simultaneous hot water supply to multiple locations.

(B) Prior Art In recent years, a shower device (B) as shown in FIG. 6 has been developed as a form of multifunctional shower.

Such a shower device (B) includes a shower device main body (10
0), a large number of shower nozzles (100a) on the lower part, side wall, and upper part, each of which can be used for different purposes.
is provided, and by spraying water onto the user from an arbitrary shower nozzle (100a), the user can not only wash the body but also
You can get the pine surge effect, etc.

However, in using such a shower device (B), a large amount of shower water is required if appropriate temperature shower water is to be spouted from all shower nozzles (100a).

Therefore, in recent years, a hot water supply system in which a hot water tank (C) is interposed between a water heater (A) and a shower device (B) as shown in FIG. 6 has been developed.

The configuration of such a hot water supply system will be briefly explained with reference to FIG.
The water supply tank (E) that receives water via the water supply tank (E) connects its water outlet to the water inlet (103) of the water heater (A) through a water supply pipe (102) having a water supply pump (PI) in the middle.
is connected to.

(110) is an electric valve that controls the amount of water supplied to the water heater (A).

The hot water outlet (104) of the water heater (A) is connected to the first hot water pipe (105).
) is connected to the hot water inlet (10B>) of the hot water tank (C), and the hot water outlet (107) of the hot water tank (C) is connected to the second hot water pipe (10B) which has a hot water pump (p2) in the middle.
8) is connected to a shower device (B) which is a hot water source via a hot water mixing faucet (109).

With this configuration, a sufficient amount of high-temperature hot water can be stored in the hot water tank (C) at all times, and the shower device (B
) A large amount of shower water can be spouted from the shower spout with plenty of time.

(c) Problems to be solved by the invention However, if the amount of hot water dispensed from the hot water mixing faucet is large, the amount of hot water consumed in the hot water tank also increases, and if the amount consumed is greater than the amount of hot water supplied from the water heater. The amount of hot water stored in the hot water tank gradually decreases, and it may eventually become impossible to supply hot water.

(d) Means for Solving the Problems In the present invention, the water outlet of the water tank is connected to the water inlet of the water heater by a water supply pipe for the water heater, which is equipped with a water supply pump for the water heater in the middle, and the outlet of the water heater is connected to the water inlet of the water heater. The hot water outlet is connected to the inlet of the hot water tank by a primary hot water supply pipe, and the hot water outlet of the hot water tank is connected to a hot water mixer faucet by a secondary hot water pipe that is equipped with a hot water pump in the middle. In a hot water supply system in which the water inlet is connected to a hot water mixing faucet by a water supply pipe equipped with a water supply pump in the middle, and the hot water mixing faucet is connected to the hot water output, a flow rate adjustment valve is provided downstream of the hot water pump, and a water supply tank is connected to the hot water supply tank. A water level sensor is installed to detect the water level in the tank, and when the water level sensor detects that the water level in the hot water tank has fallen below a preset hot water output switching level, the flow rate adjustment valve switches the flow rate to increase the hot water output. It is an object of the present invention to provide a hot water supply system that is characterized by suppressing.

In addition, when the flow rate adjustment valve switches the flow rate to suppress the amount of hot water dispensed, the water level sensor detects the water level in the hot water tank at regular intervals, and only when the water level continues to drop, the flow rate adjustment valve is switched on. It is also characterized by performing a flow rate reduction operation.

(E) Functions and Effects According to the present invention, when the water level in the hot water tank falls to the hot water output switching level, the flow rate is controlled by the flow rate adjustment valve to suppress the hot water output from the hot water tank, thereby preventing hot water from flowing out. As the amount of hot water decreases, the amount of hot water supplied from the water heater increases, and the amount of hot water stored in the hot water tank that had previously decreased can be recovered. Prevented.

In addition, if the water level in the hot water tank decreases despite the hot water output amount switching described above, the water level sensor detects the water level in the hot water tank at regular intervals after switching the hot water output amount, and the water level continues to decrease. In this case, by operating the flow rate regulating valve in the direction of decreasing the flow rate for a predetermined period of time, the amount of hot water dispensed becomes smaller than the amount of hot water supplied, and a drop in the water level of the hot water tank can be prevented.

Note that when the water level stops decreasing, the operation of the flow rate regulating valve stops.

(f) Examples Embodiments of the present invention will be described based on the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a hot water supply system (S) according to the present invention, and the system (S) mainly consists of a water supply tank (13) connected to a water supply pipe (16) via a ball tap (15). , a gas combustion type water heater (11) connected to the water supply tank (13) via a water supply pipe (30) for the water heater, and a hot water tank connected to the hot water outlet (35) of the water heater (11). (14) and each tank (13) (1
4), a hot water mixer tap (19) connected to the hot water outlet light, a water supply pump (32) for the water heater that supplies water from the water tank (13) to the water heater (11), and a hot water mixer tap (19) connected to the hot water tap (13). 19), and a hot water pump (43) that supplies hot water from the hot water tank (14) to the hot water mixing faucet (19).

In addition, the water supply pipe (1) connects the water outlet (17) of the water supply tank (13) and the water inlet (20) of the hot water mixer tap (19).
8), connect the water supply pump (2) from the water tank ([3) side].
1), relief valve (22), check valve (23), flow switch (24), and antifreeze heater (27) are installed in the above order, and the flow switch (24) and antifreeze heater (27) A pressure switch (25) and an accumulator (26) are attached via instrument piping connected between the two.

Note that the relief valve (22>) is connected to the water supply tank (3) via a reflux pipe.

In addition, the water supply pipe (30) for the water heater that connects the other water outlet (29) of the water supply tank (13) and the water inlet (31) of the water heater (11) is connected to a water supply pipe (30) for supplying hot water from the water supply tank (13) side. Machine water supply pump (32), check valve (33), antifreeze heater (
34) is installed.

In the figure, (13a) is a lower limit float switch that outputs a signal when the water in the water tank (13) drops below the water supply level.

In addition, the above-mentioned entry is made on the primary hot water supply pipe (36) made of steel pipe etc. that connects the hot water outlet (35) of the water heater (11) and the hot water inlet (37) opened at the bottom of the hot water tank (14). A heat insulating heater (39) is installed close to the sprue (37), and a bypass pipe (38) is installed upstream of the heater (39).
By branching off the piping (38) and connecting the pipe (38) to the bottom surface, a circulation path (40) for thermal convection when the insulating heater (39) is operated is formed.

Next, a secondary hot water pipe (42) connecting the hot water outlet (41) of the hot water tank (14) and the hot water inlet (59) of the hot water mixing faucet (19) is connected from the hot water tank (14) side. , hot water pump (43), relief valve (44), check valve (45),
The flow rate adjustment valve (46L flow switch (47) is installed in the above order, and the pressure switch (48) and auxiliary valve are connected through the instrument piping connected between the flow switch (47) and the hot water mixing faucet (19). A tank (49) and an accumulator (50) are installed.

Note that the relief valve (44) is connected to the hot water tank (14) via a reflux pipe (51).

In the figure, (14a) is an upper limit float switch that outputs a signal at the upper limit of the level of hot water stored in the hot water tank (14), (L4b) is the level of hot water in the hot water tank (13),
Whether or not the water supply pump (32) for the water heater is at a level that requires driving, whether or not the level is higher than the level that requires switching the amount of hot water to the hot water mixing faucet (19), and whether or not the water supply pump (43) should be stopped. The water level sensor (14c) is a temperature sensor that detects in three stages whether it is at the desired level or not.

The mixed hot water outlet (52>) of the hot water mixing faucet 19) is connected to a shower device (55) having a large number of shower heads 54) via a mixed hot water on/off valve (53).

In the figure, (60) is a control device, (61) is a remote control operation panel, and (63) is an AC power source.

Note that since the shower device (55) has a large number of shower heads (54), it consumes a large amount of mixed hot water.

Figure 2A shows each water level in the water tank (13), which has a height of 870 mm and has a pump stop level (L2) 100III+1 above the bottom to prevent air suction. ) is set and a lower limit float switch (13a) is installed, and the same level (L
2) It stores 16g of water at a time.

In addition, an upper limit level (Ll) is set just above 679 from the bottom, and the water supply is stopped by the ball tap (15), and when the same level (Ll) is reached, the effective capacity is 9.
It stores 2g of water.

Note that the upper space capacity above the upper limit level (Ll) is in the order of 191 in height.

Figure 2B shows each water level in the hot water tank (14), which has a height of 870 m and has a pump stop level (L6) 100 m above the bottom to prevent air suction. , the hot water output switching level (L
5>, the drive level (L4) of the water supply pump (32) for the water heater is set above 570, and the water level sensor (14b)
Each level (L4) (L5) (L6) is detected.

Further, an upper limit level (Ll) is set 770 degrees above the bottom surface, and an upper limit float switch (14a) is provided.

Note that the hot water tank (14) has a pump stop level (L).
6) 16g at time, 32 at hot water output switching level (L5)
47. At the upper limit level (L3), an effective capacity of 90 g of hot water is stored, and the upper space capacity above the upper limit level (L3) is 191 +nn+ in height.

Next, the operation of the hot water supply system (S) will be explained with reference to a flowchart.

[Initialization and water storage hot water storage operation] (Fig. 3) When the power supply is connected to the hot water supply system (S), the hot water supply system (S) starts up (198), and initializes the opening degree of the flow rate adjustment valve (46) (198).
99) will be carried out.

In this initialization, when the power is turned on, the opening valve (46) is rotated in the opening direction, and when the open detection switch is operated, it is then rotated in the closing direction until the close detection switch is operated, and then stopped.

Memorize the time required for this fully open-fully closed rotation,
The reference position in the hot water supply capacity switching operation is defined as the position where the flow rate adjustment valve is rotated from the fully open position to the closing direction by 1/3 of the above time, or from the fully closed position to the valve opening direction by 2/3 of the time.

In addition, in the initial state, the water supply tank (13) and the hot water supply tank (14) are empty, so the lower limit float switch (1
3a) is turned OFF, a water cutoff/new hot water signal is output to the shower device (55) (213>), and the discharge of mixed hot water is prohibited.

On the other hand, the water tank (13) has a ball tap (15).
Water is being supplied from the water supply pipe (16) via the water supply pipe (16), and when the water level rises and the lower limit float switch (13a) is turned on, the water supply pump (21) and the water supply pump (32) for the water heater are connected. (201).

At this time, if the mixed hot water on-off valve (53) is closed, the pressure in the water supply pipe (18) will rise to the set value due to the drive of the water supply pump (21), and the pressure switch (25) will turn OFF.
Also, since the water does not flow, the flow switch (2
4) is also turned off (203) and the water supply pump (21)
<204).

In addition, the above pressure is applied to the accumulator (26) and the check valve (
23), it is held until the mixed hot water on-off valve (53) is opened.

In the above state, only the water supply pump (32) for the water heater is operating, and some of the water that has flowed into the water supply tank (13) is transferred to the water heater (11) by the water supply pump (32) for the water heater. )
is supplied, the hot water becomes high temperature, and storage of hot water in the hot water tank (14) is started (202).

Then, the level of hot water in the hot water tank (14) rises,
When the water level reaches a certain level, the output of the water level sensor (14b) is switched (205) and the hot water pump (43) is driven (2).
0B), the flow rate adjustment valve (46) is operated to suppress the amount of hot water supplied to the hot water mixing faucet (19) (206°).

At the same time, a switching signal is output to the shower device (55) side, and the already output water cutoff/new hot water signal is canceled (20B'').

At this time, if the mixed hot water on-off valve (53) is closed, the pressure in the secondary hot water pipe (42) increases, and the pressure switch (42) increases.
8) is turned off (207), and since there is no flow of hot water, the flow switch (47) is also turned off and the hot water supply pump (43) is stopped (208).

The above pressure is controlled by the mixed hot water on/off valve (
53) is held until released.

When the level of hot water in the hot water tank (14) reaches a level that should drive the water supply pump (32) for the water heater (213), the water supply tank (13) and the hot water tank (14) are filled with a sufficient amount of water for supplying and discharging hot water. Since hot water and high temperature hot water are stored, hot water can be discharged from the shower device (55), and the switching signal already output to the shower device (55) is canceled (2+4). .

Also, if the level of hot water in the hot water tank (14) is
14), the upper limit float switch (lta) is turned on (215>) and the water supply pump (32) for the water heater is stopped (21B).

Then, when the water tank (13) is full, (210) Y
, the ball tap (15) closes (211), and the water storage/hot water storage operation is completed (212>).

[Brewing operation of mixed hot water] (Fig. 4) Open the mixed hot water on-off valve (53) and turn on the shower device (55).
) When you start using (300), the pressure switches (25) and (48) on the water side and hot water side are turned on (301),
Driving water supply and hot water pumps (21) and (43) (302
), by discharging mixed hot water and water at a set temperature from the shower device (55) through the hot water mixing faucet (19),
Start water supply/hot water supply (303).

In this state, depending on the flow rate of mixed hot water, the water side and hot water side pressure switches (25) (4g) may be turned off (305), but each flow switch (24) (47) is turned on. (304), so the water supply and hot water pump (
21) Continue driving (43).

Simultaneously with starting the hot water pump (43), the flow rate regulating valve (46) is rotated from the fully open position to the fully open position.

After the upper limit float switch (14a) is turned off, the water level sensor (14b) is connected to the hot water tank (14).
Monitor the level of hot water in the water heater (306), and if it falls below the water heater pump drive level, turn on the water heater water pump (306).
2) (307), and starts storing hot water in the hot water tank (14) (308).

Next, when the use of the shower device (55) is temporarily stopped (309), the water side and hot water side pressure switches (25) (
48) and each flow switch (24) (47) is OF
FI: Pickpocket (310), water supply and hot water pump (
21) Stop (43) (311).

In this state, the hot water pump (43) is stopped, so the flow rate regulating valve (46) is rotated from the fully open position to the fully closed position.

Then, if you listen to the use of the shower device (55) again (312), the water side and hot water side pressure switches (25) (
48) turns ON (313), and the water supply and hot water pump (
21) (43) is driven (314), and the hot water mixer tap (
19), water supply or hot water supply is restarted by discharging mixed hot water at the set temperature from the shower device (55) (315).

In addition, in this state, the water side and hot water side pressure switches (2
5) (48) may be turned off depending on the flow rate of mixed hot water (317), but the flow switch (24)
Since (47) is ON (31B), the water supply and hot water supply pumps (21) and (43) continue to be driven.

Further, the flow rate adjustment valve (46) is connected to the hot water pump (
43), it rotates from the fully closed position to the fully open position.

During the hot water dispensing process, the amount of hot water coming from the hot water mixer tap (19) was too large, and the amount of hot water coming from the hot water tank (14) was too large.
), the amount of stored hot water decreases and the water level in the hot water tank (14) drops.

When the water level falls below the hot water output switching level (L5), the water level sensor (14b) detects this (31g).
, performs the hot water output switching operation, that is, the flow rate adjustment valve (46
) throttles the flow rate (319>) to suppress the drop in water level in the hot water tank (14), and at the same time, the shower device (5
5) Outputs a switching signal to the side (319°).

[Hot water output amount switching operation] (Fig. 4A) When the hot water output amount switching operation starts (700), the flow rate adjustment valve (46) is rotated in the valve closing direction from the fully open position to the reference position for the hot water output amount switching (701). ), performs an operation to throttle the flow rate, then detects the water level in the hot water tank (14) in 2 seconds (702), and if the water level is lower than the previous detected value (702) Y, Rotate the flow rate adjustment valve (46) in the valve closing direction for 0.2 seconds (703), and if the water level has not lowered than the previous detected value (702), N.
Hold the flow rate adjustment valve (46) at the reference position (704)
) By repeating this operation at 2 second intervals, the flow of hot water from the hot water tank (14) and the amount of hot water are suppressed.

Then, when the water level in the hot water tank (14) rises and reaches a level (L4) that drives the water supply pump (32) for the water heater, the flow rate adjustment valve (46) is rotated to the fully open position.

Such control operations can prevent the water level in the hot water tank 14) from falling below a certain level.

Then, when the use of the shower device (55) is stopped (3
20), Flowsui Sochi (24) on the water side and hot water side (
47) The wall is turned off (321), and the water supply and hot water pumps (21) and (43) are stopped (322>), and the above (
213) Return to Ste Tsubu.

In addition, the water level sensor (14b) performs the above-mentioned hot water output amount switching operation.
This is performed whenever it is detected that the amount of hot water is less than the switching level (L5).

In addition, when the water level of the water tank (13) reaches the lower limit level (L2) by the lower limit float switch (13a) provided in the water tank (13), the following water outage, water supply, hot water tank (13) ( 14) is provided with a control operation (500) for recovering from troubles such as the level drop.

[Control operation for trouble recovery (Fig. 5) During the above-mentioned "mixed hot water dispensing operation", if the output of the water level sensor (14b) falls below the pump stop level (601), the hot water supply pump (43)
) to prevent the pump (43) from sucking in air (602).

During this time, the water supply pump (32) for the water heater is being driven, and when the water supply tank (14) level recovers to the switching level (603), the hot water supply capacity switching operation is started.51
0) Output a switching signal to the shower device side (52
0).

During the above control operation, the water supply tank (18
), the water level in the water supply tank (13) decreases, and the lower limit float switch (13a) or 0FF
L (521), water supply, hot water supply and water supply pump for water heater (2
1N43) (32) is stopped (522), a water cutoff/new hot water signal is output to the shower device (55) side, the switching signal is canceled (523), and water supply/hot water supply is stopped (524).

Therefore, the level of the hot water tank (■4) decreases,
If there is a risk of inhaling air from the hot water pump (43),
Since the hot water supply pump (43) is stopped, generation of noise and loss of durability due to idle running of the pump (43) are prevented.

In addition, if the water level in the water tank (13) drops due to an unexpected water outage, blockage or failure of the ball tap (15), and water cannot be supplied from the tank (8) to the hot water mixing faucet (19), the hot water pump (43〉) or it will stop, so either the hot water from the hot water tank (14) or the hot water mixer tap (19) will stop.
) and the risk of this being discharged from the shower device (55) is prevented.

Additionally, the water supply pump (21) is also stopped, which prevents cold water from being discharged from the shower device (55) and also prevents the generation of noise and the pump (43) from idling and impairing its durability. , Furthermore, water supply pump for water heater (32
) is also stopped, thereby preventing the pump (32) from running idle.

After repairing the cause of the water outage, the water tank (13)
(525), and returns to step (200) of "water storage and hot water storage operation".

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of the hot water supply system according to the present invention, FIGS. 2A and 2B are explanatory diagrams of the water supply tank and the water level of the hot water supply tank, and FIGS. 3 and 4 are flowcharts of the control operation. FIG. 4A is a flowchart of the hot water supply amount switching operation, FIG. 5 is a flowchart of the trouble recovery control operation, and FIG. 6 is a conceptual diagram illustrating the configuration of a conventional hot water supply system. (S) = (13): (13a) (14): (14b) (21): (30): (32): (3B): Hot water supply system Water supply tank: Lower limit float switch Hot water tank: Water level sensor Hot water mixing faucet Water supply pump Water intake pipe for water heater Water supply pump for water heater - Next side hot water supply pipe (42): Secondary side hot water supply pipe (43): Hot water supply pump (4B): Flow rate adjustment valve

Claims (1)

[Scope of Claims] 1) Connect the water outlet of the water tank to the water inlet of the water heater by a water supply pipe for the water heater that is equipped with a water supply pump for the water heater in the middle, and connect the water outlet of the water heater to the primary water supply pipe. The hot water supply tank is connected to the inlet of the hot water tank, and the hot water outlet of the same hot water tank is connected to the hot water mixer faucet by a secondary hot water supply pipe that has a hot water pump in the middle, and the water supply pump is connected to the outlet of the water tank in the middle. In a hot water supply system that is connected to a hot water mixing faucet by a water supply pipe equipped with A water level sensor is provided to detect, and when the water level sensor detects that the water level in the hot water tank has fallen below a preset hot water output switching level,
A hot water supply system characterized by a flow rate regulating valve that controls the amount of hot water output by switching the flow rate. 2) When the flow rate adjustment valve switches the flow rate to suppress the amount of hot water dispensed, the water level sensor detects the water level in the hot water tank at regular intervals, and only when the water level continues to drop, the flow rate adjustment valve is switched on. The hot water supply system according to claim 1, characterized in that the water supply system performs a flow rate reduction operation.