JPH0462332A - Hot water supply system - Google Patents

Abstract

PURPOSE:To prevent the generation of noise resultant from the entrainment of air in a water supply pump or the damage of said pump by installing a lower limit float switch to a water supply tank and halting the operation of the water supply pump when a water level in the water supply tank falls below a predetermined water level. CONSTITUTION:In a hot water supply system S, a lower limit float switch 13a designed to turn on when the water level in a water supply tank 13 reaches the lower limit capacity to supply water is installed in order to perform control action 500, which restores operational troubles. When the output of a water level sensor falls below a pump suspension water level, a hot water supply pump 43 is adapted to halt its operation and hence prevents the entrainment of air in it. In the mean time, a water supply pump 32 for a hot water supply heater is running. When the water level in a hot water supply tank 14 is restored, hot water supply change over operation starts so that a change over switch may be transmitted to a shower device side. When a water level in the water supply tank 13 drops due to some troubles during the control operation and the lower limit float witch 13a is turned OFF, the water supply pumps 21, 43, and 32 for water supply, hot water supply, and hot water supply heater will be halted.

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 sometimes requires a large amount of hot water, 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 introduced as a form of multifunctional shower.

Such a shower device (B) has a shower device main body (10
(1) A large number of shower nozzles (100a
), and by ejecting water to the user from an arbitrary shower nozzle (100a), not only body washing but also a pine surge effect etc. can be obtained.

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 (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 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 (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 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 (B
) A large amount of shower water can be sprayed from the shower spout with plenty of time.

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

(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 water spout is connected to the inlet of the hot water tank by the primary hot water supply pipe, and the hot water outlet of the hot water tank is connected to the hot water mixing faucet by the secondary hot water pipe,
In a hot water supply system in which the water outlet of the water supply tank is connected to a hot water mixer faucet by a water supply pipe equipped with a water supply pump midway, and the hot water mixer faucet is connected to the hot water outlet, a lower limit float switch is provided in the water supply tank, and the same switch is installed. However, the present invention aims to provide a hot water supply system characterized by stopping the operation of the water supply pump when it is detected that the water level in the water supply tank has fallen below a preset water level.

(E) Functions and Effects According to the present invention, when the water level in the water supply tank falls below the lower limit that allows water supply, the lower limit float switch detects this and stops the operation of the water supply pump. Idling can be prevented.

In addition, if you set the lower limit float switch to output when the water level in the water tank drops to the limit water level that causes the water pump to entrain air, you can avoid noise caused by air entrainment and damage can be prevented.

(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 includes 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 hot water tank 13) via a water heater water supply pipe (30), and a hot water tank (14) connected to the hot water outlet (35) of the water heater (11). ) and each tank (IS) (1
4), 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) connected to the hot water outlet. 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) is connected to the water supply pump (2) from the water tank (13) side.
1), relief valve (22), check valve (23), flow switch (24), antifreeze heater 27) are installed in the above order, and the flow switch (24) and antifreeze heater (27) are installed in the above order. A pressure switch (25) and an accumulator (26) are attached via instrument piping connected between them.

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), 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).
) 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 (46) and 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),
It is determined whether or not the level at which the water supply pump (32) for the water heater should be driven is equal to or higher than the level at which it is necessary to switch the amount of hot water supplied to the hot water mixing faucet (19), and whether or not the water supply pump (43) for the water heater 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 rads (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 supply tank (13), which has a height of 870 mm and has a pump stop level (L2) 100 mm above the bottom to prevent air suction. ), and a lower limit float switch (13a) is provided, and 16g of water is stored at the same level (L2).

In addition, an upper limit level (Ll) is set 679 degrees above the bottom, and the water supply is stopped using the pole 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 191 mm in height.

Figure 2B shows the water levels of the hot water tank (14), which has a height of 870+n+s;
From the bottom, there is a pump stop level (L6) to prevent air suction towards the 100 fighter, a switching level (L5) above the 200 mTl, and a water supply pump for the water heater (32 above the 570 dragon).
), and each level (L4) (L5) (L6) 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).
When the upper limit level (L3) is 169 g at switching level (L5) and 901 j at upper limit level (L3), the upper space capacity above upper limit level (L, 3) is 191 dragons. It is.

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] (Figure 3) When the power supply is connected to the hot water supply system (S), the hot water supply system (S) starts up and initializes the opening degree of the flow rate adjustment valve (4B) (191).
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 by 1/3 of the above time from the fully open position in the closing direction, or by 2/3 of the time 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 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 (I6) via the water supply pipe (I6), 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) (201).

At this time, if the mixed hot water on-off valve (53) is closed, the water supply pump (21) is driven, and the pressure in the water supply pipe (18) rises to the set value, and the pressure switch (25) turns 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 (I3) is transferred to the water heater (11) by the water supply pump (32) for the water heater. )
The hot water becomes hot and begins to be stored in the hot water tank (I4) (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).
At the same time as 06), the flow rate adjustment valve (46) is operated to suppress the amount of hot water supplied to the hot water mixing faucet (19) (20[i').

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 (20g).

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 pump (32) for the water heater (213), a sufficient amount of water is added to the water tank (I3) and the hot water tank (14) to supply and release hot water. Since 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 (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 (2113>).

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

Close the hole tap (15) or valve (21+) to store water.
The hot water storage operation is completed (2+2).

[Brewing operation of mixed hot water] (Fig. 4) Open the mixed hot water on-off valve (53) and turn on the shower device (55).
) starts using (300), the pressure switches (25) (48) on the water side and hot water side are turned on (301).
, water supply, and hot water supply pumps (21) and (43) are driven (3[
12) 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 (I9) (303).

In this state, depending on the flow rate of mixed hot water, the pressure switches (25) (4g) on the water side and hot water side may be turned off (305), but each flow switch (24) (47) is turned off.
Since it is set to N (304), the water supply and hot water pump (2
1) 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).If the level falls below the water pump drive level for the water heater, the water supply starts. Machine water pump (32
) (307) to start storing hot water in the hot water tank (14) (3'08).

Next, when the use of the shower device (55) is temporarily stopped (809), the water side and hot water side pressure switches (25) (
48) and each flow switch (24) (47) is OF
F (310), water supply and hot water pump (21) (
43) is stopped (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 open 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) (48) may be turned off depending on the flow rate of mixed hot water (317), 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 level of the hot water tank (14) drops.

Then, 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 k amount 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 amount of hot water discharged from the hot water supply tank (14) is suppressed by rotating the flow rate regulating valve (46) in the closing direction for 02 seconds to reduce the flow rate, which is repeated every 2 seconds until the amount of hot water supplied exceeds the amount of hot water discharged.

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,
Rotate the flow rate adjustment valve (46) to the fully open position.

Such control operations can prevent the water level in the hot water tank (14) from falling below a predetermined 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), and the water supply and hot water supply pumps (21) and (43) are stopped (322), and the above (21)
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 that allows water supply, and also prevents water outage, water supply, and hot water supply as described below. Tank (13) (
A control operation (500) is provided to recover from troubles such as a drop in the level of +4).

[Control operation for trouble recovery] (Fig. 5) During the hot water dispensing operation j of the above-mentioned 1 mixed hot water, when 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 the second period, the water supply pump (32) for the water heater is driven, and when the level of the hot water tank (14) or the switching level is recovered (603), the hot water supply capacity switching operation is started.
0) Output the switching signal to the shower device side (5
20).

During the above control operation, due to an unexpected water outage, blockage or malfunction of the port tap (15), the water supply tank (+3)
If water is no longer supplied to
L (521), stops the water supply, hot water supply, and water supply pumps (21), (43), and (32) for the water heater (522), outputs a water cutoff/new hot water signal to the shower device (55) side, and cancels the switching signal mentioned above. (523), and the water/hot water supply is stopped (524).

Therefore, the level of the hot water tank 14) decreases,
If there is a risk of inhaling air from the hot water pump (43),
Since the hot water pump (43) is stopped, generation of noise and loss of durability due to the pump (43) being idle are prevented.

In addition, if the water level in the water tank (13) drops due to an unexpected water outage, blockage or malfunction of the pole tap (15), and water cannot be supplied from the tank (13) to the hot water mixing faucet (19), the hot water pump (43) stops, only the hot water from the hot water tank (14) will flow from the hot water mixer tap (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, which prevents 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 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. 2AID 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 diagrams for explaining the control operation. FIG. 5 is a flowchart of the control operation for trouble recovery, 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 (3B) Secondary side hot water supply pipe (42)/Secondary side hot water supply pipe (43): Hot water supply pump (413): Flow rate adjustment valve

Claims (1)

[Claims] 1) Connect the water supply outlet of the water supply tank to the water supply inlet of the water heater through a water supply pipe for the water heater equipped with a water supply pump for the water heater in the middle, and connect the water supply outlet of the water heater to the water supply inlet of the hot water supply tank through the primary water supply pipe. and connect the hot water outlet of the hot water tank to the hot water mixing faucet through a secondary hot water supply pipe, and connect the water outlet of the water supply tank to the hot water mixing faucet through a water supply pipe having a water supply pump in the middle, In a hot water system in which a hot water mixing faucet is connected to the hot water outlet, a lower limit float switch is installed in the water tank, and when the switch detects that the water level in the water tank has fallen below a preset water level, the water supply pump is activated. A hot water supply system characterized by stopping the operation of.