JPH0462330A - Hot water feeding system - Google Patents

Abstract

PURPOSE:To avoid any dangerous state for discharging hot water out of a shower or the like by a method wherein a lower limit float switch for outputting a signal when a water level in a water feeding tank is lowered than a lower limit capable of feeding water is installed in the water feeding tank and then an operation of a hot water feeding pump is stopped in response to an output of the float switch. CONSTITUTION:As an output of a water level sensor 14b is lower than a pump stopping level during feeding hot water of mixed hot water, a hot water feeding pump 43 is stopped so as to prevent this pump from sucking air. During this operation, a water supplying pump 32 for a hot water feeder is being operated. As a level of the hot water feeding tank 14 is recovered up to its changing-over level, a hot water feeding capability changing-over operation is started and then a changing-over signal is outputted to a shower device. In addition, during the aforesaid controlling operation, if water is not supplied to the water feeding tank 13 due to a closing or a trouble of a ball tap 15 as well as an accidental stop of feeding water, a water level in the water feeding tank 13 is lowered, a lower limit float switch 13a is turned OFF, water feeding, hot water feeding and hot water feeder pumps 21, 43 and 32 are stopped, a water shortage signal and a hot water shortage signal are outputted to a shower device 55 and then the aforesaid changing-over signal is released and then water feeding and hot water feeding are stopped.

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a multi-functional hot water supply system used for a hot water source that sometimes requires a large amount of hot water, such as a tower or simultaneous hot water supply to multiple locations. Regarding.

(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
A large number of shower nostle (100a) are installed at the bottom, side wall, and top of the shower nozzle (100a), each of which can be used for different purposes. Not only cleaning, but also 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 nostles (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) 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 (^).

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 the shower device (B), which is the hot water outlet, via the 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 enough room.

(c) Problem to be solved by the invention However, since the water supply pump and the hot water supply pump are driven independently, if the supply of water to the water tank stops due to an unexpected water outage or malfunction, etc. If the water level in the water tank drops, water cannot be supplied to the hot/cold water mixer faucet, and hot water is supplied to the hot/cold water mixer faucet, causing hot water to be discharged from the shower device, which is extremely dangerous.

In addition, there are hot and cold water mixing faucets that have a built-in thermostat that automatically adjusts the hot water mixing ratio and discharges water at an appropriate temperature. Although it is possible to stop the hot water from being discharged by using the hot water, there is a risk that hot water will be discharged from the tap due to the delay in the operation of the thermostat, even if it is only for a short time.

(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. In a hot water supply system in which a hot water outlet is connected to a hot water inlet of a hot water tank by a primary hot water supply pipe, and a hot water outlet of the same hot water tank is connected to a hot water outlet by a secondary hot water supply pipe having a hot water pump in the middle, the water supply tank To provide a hot water supply system characterized in that a lower limit float switch is provided that outputs an output when the water level in the tank falls below the lower limit that allows water supply, and the operation of the hot water pump is stopped by the switch output. It is something.

(e) Functions and Effects According to the present invention, if the set water level is set to the limit water level that can supply water to the water supply tank or the hot water mixing faucet, when the water level in the water supply tank falls to this water level, the lower limit float switch is activated. outputs a signal to stop the operation of the hot water pump,
By stopping the hot water supply to the hot water outlet, it is possible to prevent the risk of hot water being discharged from the shower device or the like.

(f) Examples Embodiments of the present invention will be described with reference to 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)
) and 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, water supply piping 1 connects the water outlet (17) of the water supply tank (13) and the water inlet (20> of the hot water mixing faucet (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), 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 (2B) are attached via instrument piping 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 the 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) falls 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 @ adjustment valve (4B) and the flow switch (47) are installed in the above order, and the pressure switch (48) is connected via the instrument piping connected between the flow switch (47) and the hot water mixing faucet (19). ), auxiliary tank (49), and 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 that can be stored in the hot water tank (14), and <14b) is the level of hot water in the hot water tank (13).
Whether or not the level is such that the water supply pump (32) for the water heater should be driven, 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 the hot water pump (43) should be stopped. The water level sensor (14c) is a temperature sensor that detects water levels in three stages.

The mixed hot water outlet (52) of the hot water mixer 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 of the water supply tank (13), which has a height of 870III11 and has a pump stop level (C2) 100 degrees 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 above the 679 gate from the bottom, and the water supply is stopped by the hole tap (15), and when the same level (C1) is reached, the effective capacity is 9.
It stores 2Ω water.

Note that the upper space capacity above the upper limit level L is 191 mm 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 (C6) 100 +nTI above the bottom to prevent air suction. , 200 mm above the switching level (C5), 570 mm above the water heater water pump (3
2) set the drive level (C4), and set the drive level (C4) of the water level sensor (
14b) to detect each level (C4) (C5) (C6).

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

In addition, the hot water tank (14) has a pump stop level (C
6) It stores an effective capacity of 16g of hot water at one time, 32g at the switching level (C5), and 90g at the upper limit level (C3), and the upper space capacity above the upper limit level (C3) is 191 dragons in height. be.

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) will not start (198), and the opening degree of the flow rate adjustment valve (46) will be initialized (198).
199) will be carried out.

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 from the fully open position to the closing direction for the above-mentioned time of 173, or from the fully closed position to the valve opening direction for the time 273.

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 shirt 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 (200), the water supply pump 21) and the water supply pump (32) for the water heater are activated. Drive (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).
0G), 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 (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 (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 pole 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).
) starts to be used (300), the water side and hot water side pressure switches (25)<48) are turned on (301),
Driving water supply and hot water pumps (21) and (43) (302
), water supply/hot water supply is started by discharging mixed hot water at a set temperature from the shower device (55) via the hot water mixer faucet (19) (30 g).

In this state, depending on the flow rate of mixed hot water, the water side and hot water side pressure switches (25) (48) may be turned off (305), but each flow switch (24) (47)
is ON (304), so the water supply and hot water supply pumps (21>(43)) continue to be driven.

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) 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 hot water is supplied. 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) is OF
F +: Nari (31 (1 n, water supply and hot water pump (2)
1) Stop (43) (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> (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 open 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) decreases.

When the same level falls below the hot water output switching level, the water level sensor (14b) detects this (318), and the flow rate adjustment valve (4th) throttles the flow rate (319), lowering 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
), and when the water level in the hot water tank (14) drops and crosses the set level, rotate the flow rate adjustment valve (46) in the closing direction for 0.2 seconds to adjust the flow rate. The amount of hot water discharged from the hot water supply tank (14) is suppressed by repeating the throttling operation every two seconds until the amount of hot water exceeds the amount of hot water supplied or 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, the flow rate regulating 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) , water side and hot water side flow switch (24) (4
7) is turned off (321), and 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 possible water supply, and the water supply system (S) is equipped with a lower limit float switch (13a) that outputs an output when the water level reaches the lower limit of water supply. (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 (fill), the hot water supply pump (4)
3) is stopped 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 level of the hot water tank (14) recovers to the switching level (603), the hot water supply capacity switching operation is started.
0), outputs a switching signal to the shower device side (520
).

In addition, during the above control operation, the water supply tank (13
), the water level in the water tank (I3) decreases and the lower limit float switch (13a) turns OFF.
F L (521), stop the water supply, hot water supply, and water supply pump (21) (43) (32) for the water heater (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 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 (I9).
) 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, which prevents the pump (32) from running idle.

After repairing the cause of the water outage, the water tank ([3)
(525), and returns to step (200) of "water storage and hot water storage operation".

[Brief explanation of drawings]

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) (13a) (14): (14b) <19): (21): (30): (32): (36): (4B): Hot water system Water 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 Primary side hot water supply pipe Secondary side hot water supply pipe Hot water supply pump 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. In a hot water system in which the hot water inlet of the hot water tank is connected to the hot water inlet of the hot water tank, and the hot water outlet of the hot water tank is connected to the hot water outlet by a secondary hot water supply pipe equipped with a hot water pump in the middle, the hot water in the tank is connected to the hot water tank. A hot water supply system characterized by providing a lower limit float switch that outputs an output when the water level falls below a lower limit that allows water supply, and stopping the operation of a hot water pump by the switch output.