JPH0462331A - Hot water supply system - Google Patents

Abstract

PURPOSE:To prevent air entrainment or idle running and extend service life by installing a water level sensor, which detects a water level, to a hot water supply tank, and halting the operation of a hot water supply pump when the detected water falls below a predetermined water level. CONSTITUTION:After having started a hot water supply pump 43 and rotated a control flow rate control valve from full closing up to full opening simultaneously and turned off an upper limit float switch 14a, the hot water level in a hot water supply tank 14 is monitored by a water level sensor 14b. When the detected hot water level falls below a drive level of a water supply pump for hot water supply heater, a water supply pump 32 for hot water supply heater is adapted to drive, thereby starting the storage of hot water in the hot water supply tank 14. Therefore, when danger is produced that the hot water level in the hot water supply tank 14 drops and results in the entrainment of air, the hot water supply pump 43 comes to a halt, which makes it possible to prevent the generation of noise and deterioration in the durability of the pump 43 resultant from idle running.

Description

[Detailed description of the invention] (a) Industrial application field 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 multifunctional 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 introduced as a form of multifunctional shower.

Such a shower device (B) includes a shower device main body (10
0) on the bottom, side wall, and top of the unit, there are a number of Nyawanosuru (100a) that can be used for different purposes.
The system is equipped with a shower nozzle (100a) that sprays water onto the user to not only wash the body but also wash the user's body.
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 the shower nozzles (LOOA).

Therefore, in recent years, a hot water supply system in which a hot water tank (C) is interposed between a water heater (^) 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 through the water supply tank (E) connects its water outlet to the water inlet (103) of the water heater (A) by means of a water supply pipe (102) equipped with a water supply pump (PL) 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 (106) 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 (10), which is equipped with 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 [(
A large amount of shower water can be spouted from the shower spout B) with ample margin.

(c) Problems to be solved by the invention However, since the hot water pump is controlled in conjunction with the opening and closing of the hot water mixing faucet, it continues to be driven even when the water level in the hot water tank drops, so the hot water pump pumps air. Problems arise in that entrainment noise is generated and the pump runs idly, impairing its durability.

(d) Means for Solving the Problems The present invention includes a water supply pump connected to a water supply tank and a hot water supply pump connected to a hot water supply tank, and mixes water from each pump with hot water using a hot water mixing faucet. In a hot water system configured to discharge water at an appropriate temperature, the hot water tank is equipped with a water level sensor that detects the water level in the tank, and the water level sensor detects when the water level in the hot water tank has fallen below a preset water level. It is an object of the present invention to provide a hot water supply system characterized by stopping the operation of a hot water supply pump when a hot water supply system is detected.

(E) Functions and Effects According to the present invention, if the set water level is set to the limit water level at which the water supply pump causes air to be entrained, when the water level in the hot water supply tank falls to this water level, the water level sensor outputs a signal to stop the operation of the hot water pump, thereby preventing air entrainment and idling, thereby extending the life of the hot water pump.

(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) (14)
), a hot water mixer tap (19) connected to the hot water outlet, 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) from the water tank (13). ), 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, a water supply pipe (j
8) is connected to the water supply pump (2) from the water tank (13) 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 a syringe pipe connected between the two.

Note that the relief valve (22) is connected to the water supply tank (13) 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), reverse 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).
) is branched and the pipe (38) is connected to the bottom surface to form a circulation flow path (40) for heat convection when the heat retention heater (39) is operated.

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 (4B) and the flow switch (47) are installed in the above order, and the pressure switch (48) is connected through the instrument piping connected between the flow switch (47) and the hot water mixing faucet (19). , an auxiliary tank (49), and an accumulator (50) are attached.

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), (14b) 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 the water level in three stages: the desired level and the negative level.

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 the water levels of the water supply tank (No. 3), which has a height of 870 meters and has a pump stop level 100 meters above the bottom to prevent air suction. (L2) is set and a lower limit float switch (13a) is provided, and 16g of water is stored at the same level (L2).

In addition, the upper limit level (L
l) is set, and the water supply is stopped by the pole tap ([5), and at the same level (Ll), the effective capacity is 92. It stores Q's water.

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

Figure 2B shows each water level in the hot water tank (14), which has a height of 870 degrees and has a pump stop level (LB) 100 degrees above the bottom to prevent air suction. , 200m above switching level (LB), 5
The driving level (L4) of the water supply pump (32) for the water heater is set above the 7011TI, and each level (L4) (LB) (LB) is detected by the water level sensor (14b).

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).
B): 16g1 switching level (LB): 3211
At the upper limit level (C3), an effective capacity of 90 g of hot water is stored, and the upper space capacity above the upper limit level (LB) is 191 mn 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 the opening degree of the flow rate adjustment valve (46) is initialized (198).
99) is performed.

In this initialization, when the power is turned on, the valve opening (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 for 1/3 of the above time from the fully open position in the closing direction, or by 273 times from the fully closed position in the valve opening direction.

In addition, in the initial state, the water supply tank (13) and the hot water supply tank (14) are empty, so when the hot water supply system (S) starts operating (199), the lower limit float water supply tank (14) is empty.
13a) 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 piping 16) via the water supply pipe 16), and when the water level rises and the lower limit float switch (13a) is turned on (200), the water supply pump (21) and the water supply pump for the water heater (32) are activated. (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 pumped into the water heater (11) by the water supply pump (32). )
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) switches (205) and drives the hot water pump 43) (205).
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 (206'').

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 (
48) 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 that has already been output to the shower device (55) is canceled (214). .

Also, if the level of hot water in the hot water tank (14) is
14), the upper limit float switch (14a) is turned on (215) and the water supply pump (32) for the water heater is stopped (216).

Then, when the water tank (13) is full, (210) Y
.

The ball tap (15) closes (211) and the water is stored.
The 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).
) (300), the water side and hot water side pressure switches (25) (48) are turned ON (301).
, water supply, driving the hot water pumps (21) (43) (30
2) Water supply and hot water supply are started by discharging mixed hot water at a set temperature from the Java device (55) via the hot water mixing faucet (19) (303).

In this state, depending on the flow rate of the mixed hot water, the water side and hot water side pressure switches (25) and (48) may be turned off (305), but each flow switch (24) and (47) are 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 closed position to the fully open position.

After the upper limit float switch (14a) is turned OFF, the water level sensor (14b) monitors the hot water level in the hot water tank (14) (30B). Machine water pump (32
) (307) to start 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) or OF
F (310), water supply and hot water pump (21) (
43) is stopped +h (311).

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

Then, when the shower device (55) is used 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) (4g) may be turned off depending on the flow rate of mixed hot water (317), but the flow switch (24) (
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 hot water dispensing, 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 level of the hot water tank (14) decreases.

When the water level falls below the same level or the hot water output switching level, the water level sensor (14b) detects this (318), and the flow rate adjustment valve (46) throttles the flow rate (319) to lower the water level in the hot water tank (14). At the same time, a switching signal is output to the shower device (55) side (319').

Note that the hot water output switching level can be set to, for example, the hot water tank (14
) to a level of approximately 1 ha of the effective capacity of the hot water tank (
14) When the water level drops and crosses the set level,
The flow control valve (46) is rotated in the closing direction for 0.2 seconds to reduce the flow rate, which is repeated every 2 seconds until the amount of hot water exceeds the amount of hot water output, thereby suppressing the amount of hot water coming out of the hot water tank (14). do.

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

Through such control operations, it is possible to 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) , water side and hot water side flow switch (24) (4
7) is turned off (321), the water supply and hot water pumps (21) and (43) are stopped (322), and the above (21) is turned off (321).
Return to step 3).

In such a hot water supply system (S), in the present invention, the water supply tank (13) is provided with a lower limit float switch (13a) that outputs an output when the water level reaches the lower limit of water supply possible, and the following water cutoff, water supply, and hot water tank (13) (1
A control operation (500) is provided to recover from troubles such as level drop in step 4).

[Control operation for trouble recovery] (Fig. 5) During the above-mentioned "mixed hot water dispensing operation", when the output of the water level sensor (14b) falls below the pump stop level (801), the hot water supply pump (43
) to prevent the pump (43) from sucking air (802).

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 (510).
), outputs a switching signal to the shower device side (520)
.

In addition, during the above control operation, due to an unexpected water outage, blockage or malfunction of the port tap (15), the water supply tank (13)
When water is no longer supplied to the tank, the water level in the water tank (13) decreases, and the lower limit float switch (18a) is turned off.
L (521), stop water supply, hot water supply, and water supply pump for water heater (21) (-43> (32) (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 (14) decreases,
If there is a risk that the hot water pump (43) will suck in air,
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 (13) to the hot water mixing faucet (19), the hot water pump ( 43) will stop, only the hot water from the hot water tank (14) will flow to the mixer faucet (19).
) and the risk of this being discharged from the shower device (55) is prevented.

In addition, since the water supply pump (21) is also stopped, cold water is prevented from being discharged from the shower device (55), and the generation of noise and the pump (43) are prevented 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 (2 (10) of water storage and hot water storage operation j).

[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 for explaining the control operation. FIG. 5 is a flowchart of trouble recovery control operation, and FIG. 6 is a conceptual diagram illustrating the configuration of a conventional hot water supply system. (S): Hot water supply system (13): Water supply tank (13a): Lower limit float switch (14): Hot water tank (14b): Water level sensor (19): Hot water mixer tap (21): Water supply pump (30): Water heater Water intake pipe (32): Water supply pump for water heater (38) Secondary 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 tank is connected to the hot water inlet of the hot water tank, and the hot water outlet of the same hot water tank is connected to the hot water mixing faucet by a secondary hot water supply pipe equipped with a hot water pump in the middle, and the hot water mixing faucet is connected to the hot water outlet. In a hot water supply system, a water level sensor that detects the water level in the hot water tank is installed in the hot water tank, and when the water level sensor detects that the water level in the hot water tank has fallen below a preset water level, the operation of the hot water pump is stopped. A hot water supply system characterized by: