JPH0462336A - Hot water feeding system capable of performing safe operation - Google Patents

Abstract

PURPOSE:To enable a user to always enjoy a shower of suitable temperature by a method wherein a temperature keeping heater is disposed at either a primary side hot water feeding pipe or a hot water feeding tank, a temperature sensor is provided, the temperature keeping heater is fed with electric power in response to a detected value of the temperature sensor and the temperature of hot water within the hot water feeding tank is kept at a suitable temperature. CONSTITUTION:A bypassing pipe 38 is arranged in parallel with a hot water inlet port 36a of a primary side hot water feeding pipe 36. The hot water inlet port 36a has a hot water temperature keeping heater 39 fixed, so that a hot water temperature circulation flow passage 40 is formed by a hot water inlet port 36a, a hot water feeding tank 14 and the bypassing pipe 38. A controlling condition for the hot water temperature keeping heater 39 fixed to the hot water inlet port 36a of the primary hot water feeding pipe 36 for the hot water feeding tank 14 is set such that as the water level sensor 14b is more than a pump stopping level and less than a set temperature with a temperature sensor 14c, an electrical energization for the hot water temperature keeping heater 39 is started and in turn as it is higher than the set temperature, the electric power feed is so controlled that the electric power is stopped and then the hot water feeding tank 14 is always kept within a specific temperature range.

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 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. 7 has been developed as a form of multifunctional shower. Such shower device B is
A large number of shower nozzles 100a are provided at the lower part, side wall, and upper part of the shower device main body 100, and each shower nozzle 100a can be used for different purposes.
By ejecting water from 00a to the user, it is possible to not only wash the body but also have a pine surge effect and the like.

However, in using such a shower device, if shower water at an appropriate temperature is spouted from all the shower nozzles 100a, a large amount of shower water is required.

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

The configuration of such a hot water supply system will be briefly explained with reference to FIG.
The water supply tank E, which receives water through the water heater P1, has its water outlet connected to the water inlet 103 of the water heater A through a water supply pipe 102 having a water supply pump P1 in the middle thereof.

The hot water outlet 104 of the water heater A is connected to the hot water inlet 106 of the hot water tank C by a first hot water pipe 105, and the hot water outlet 107 of the hot water tank C is connected to a second hot water pipe that has a hot water pump P2 in the middle. 108 is connected to 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 a large amount of shower water can be spouted from the shower spout of the shower device B with a margin.

(c) Problems to be Solved by the Invention However, such water heater systems still have the following problems to be solved.

That is, when the shower device B is not used for a long time, the temperature of the hot water in the hot water supply tank C decreases, and when the shower device B is subsequently started to be used, the low-temperature hot water is supplied to the shower device, and the hot water is supplied from the shower nozzle 100a. If it is squirted, it will cause discomfort to the user.

In addition, if the burner etc. in water heater A is defective and cannot be ignited, in the water heater system shown in Fig. 7,
Hot water supply I! Cold water is directly supplied into the hot water tank C from the hot water outlet 100 of A, lowering the temperature of the hot water stored in the hot water tank C, and this hot water is supplied to the shower device B and is then supplied from the shower spout. If it is squirted, it will similarly cause discomfort to the user.

An object of the present invention is to provide a hot water supply system that can be operated safely and that can solve the above problems.

(D) Means for Solving the Problems The present invention connects the water outlet of the water tank to the water inlet of the water heater through a water supply pipe for the water heater, which is equipped with a water supply pump for the water heater in the middle. In a hot water system in which the hot water outlet is connected to the inlet of a hot water tank by a primary hot water supply pipe, and the hot water outlet of the hot water tank is connected to the hot water source by a secondary hot water supply pipe that is equipped with a hot water pump in the middle, A heat retention heater is installed in the side hot water supply piping or the hot water tank, and a temperature sensor is also installed, and based on the detected value of the temperature sensor, it is possible to output an energization signal to the heat retention heater and a drive stop signal to the water supply pump for the water heater. The present invention relates to a hot water supply system that can be operated safely and is characterized by being equipped with a control device.

Shower devices, bathtubs, etc. are mainly considered as hot water sources that can utilize such a hot water supply system, but it goes without saying that it can also be used for other large quantities of hot water sources.

(E) Actions and Effects With the above-described configuration, the present invention provides the following actions and effects.

In the present invention, an insulating heater is provided in the primary hot water supply piping or a hot water tank, and a temperature sensor is also provided, and based on the detected value of the temperature sensor, the control device outputs an energization signal to the insulating heater. By supplying electricity, the temperature of the hot water stored in the hot water tank can be maintained at a sufficiently appropriate temperature.

Furthermore, based on the detected value of the temperature sensor, the control device outputs a drive stop signal to the water supply pump for the water heater, thereby reliably preventing cold water from being supplied from the water heater to the hot water tank. , make sure that the temperature of the hot water stored in the hot water tank is sufficient i! ! Can be kept warm.

Therefore, it is possible to reliably prevent low-temperature hot water from being supplied from the hot water tank to the shower device, etc., and then being sprayed out to the user from the shower nozzle, etc., and the user can always
You can enjoy a shower at a suitable temperature.

(F) Examples ・The present invention will be explained in detail based on the examples shown in the attached drawings.

[Description of Hot Water Supply System] FIG. 1 shows the configuration of a hot water supply system S to which the method for safely operating a water heater according to the present invention can be applied.

As shown in the figure, the hot water supply system S includes a water supply pressurizing device 10 and a gas combustion type water heater 11 that are arranged in parallel.

As shown in FIG. 1, inside the water supply hot water pressurizing device 10, a water supply tank 13 and a hot water supply tank 14 are disposed in parallel in a casing 12.

The water supply tank 13 is provided with a pole tap 15 having a function of raising the upper limit water supply on its upper part, and the pole tap 15 is connected to a water supply source (not shown) by a water supply pipe 16.

Moreover, the water supply tank 13 has a water supply tank 13 at its lower part.
A lower limit float switch 13a is installed which is activated when the water level in the tank falls below a certain level.

On the other hand, the hot water tank 14 has an upper limit float switch 14a attached to its upper part, and a water level sensor 14b and a temperature sensor 14c attached to its lower part.

Next, the piping configuration of the hot water supply system S having the above configuration will be explained.

First, one end of the water supply pipe 18 is connected to the water outlet 17 of the water supply tank 13, and the other end of the water supply pipe 18 is connected to the water inlet 20 of the hot water mixing faucet 19.

On the water supply pipe 18, water supply pumps 21. Relief valve 22 Check valve 23
．． A flow switch 24 is installed, and a pressure switch 25. An accumulator 26 and an antifreeze heater 27 are attached.

Note that the relief valve 22 is connected to the water supply tank 13 via a circulation pipe 28.

Further, one end of a water supply pipe 30 for a water heater is connected to another water outlet 29 of the water supply tank 13, and the other end of the water supply pipe 30 for a water heater is connected to a water inlet 31 of the water heater 11. ing.

On the water supply pipe 30 for the water heater, a water supply pump 32 for the water heater, a check valve 3, and a check valve 3 are sequentially arranged from the upstream side to the downstream side.
3 and an antifreeze heater 34 are installed. On the other hand, a hot water outlet 35 of the water heater 11 is connected to a hot water inlet 37 of the hot water tank 14 via a primary hot water supply pipe 36 .

Further, a bypass pipe 38 is provided in parallel with the hot water inlet portion 36a of the -next side hot water supply pipe 36, and a heat retaining heater 39 is attached to the hot water inlet portion 36a. Then, the hot water entry portion 36a and the hot water tank 14
A heat retention circulation flow path 40 is formed by the bypass pipe 38 and the bypass pipe 38 .

Next, to explain the connection between the hot water supply tank 14 and the hot water mixing faucet 19, one end of the secondary side hot water supply pipe 42 is connected to the water outlet 41 of the hot water supply tank 14, and the other end of the secondary side hot water supply pipe 42 is connected to the water outlet 41 of the hot water supply tank 14. The end is connected to the hot water inlet 43 of the hot water mixing faucet 19.

On the secondary side hot water supply pipe 42, hot water supply pumps 43. Relief valve 44. Check valve 45. Flow control valve 46. A flow switch 47 is attached, and a pressure switch 48. 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 circulation pipe 51.

Further, as shown in FIG. 1, the mixing outlet 51 of the mixing faucet 19 is connected via a mixing hot water supply pipe 52 to a heating device 55 having a large number of jetting nozzles 54.

The mixed hot water supply pipe 52 has a mixed hot water on/off valve 53.
is installed.

[Explanatory diagram 1 of water levels in water supply tank and hot water supply tank Figure 2A shows each water level level in the water supply tank (13), and the tank (13) has a height of 870 mm,
The pump stops and a bell (L2) is set 100mm above the bottom to prevent air suction, and a lower limit float switch (13a) is installed.
! of water is stored.

In addition, the upper limit level (Ll) is located 679 mm above the bottom.
is set, and the water supply is stopped by the ball tap (15), and at the same level (Ll), an effective capacity of 921 water is stored.

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

Figure 2B shows each water level of the hot water tank (14), which has a height of 870 mm, and a pump stop level (L6) 20 bm above the bottom to prevent air suction. Switching level (L5) upwards,
The drive level (L4) of the water supply pump (32) for the water heater is set at 5701 mm above, and each level (L4) (L5) (L6) is detected by the water level sensor (14b).

Further, an upper limit level (Ll) is set above 7701 from 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) 1642 at time, 32ff at switching level (L5)
i. At the upper limit level (L3), an effective capacity of hot water of 90j2 is stored, and the upper space capacity above the upper limit level (L3) is 191) in height.

[How to operate a hot water supply system 1 Hereinafter, regarding the operation of supplying shower water to the shower device 53 using the hot water supply system S and the control device 60 described above,
This will be explained with reference to the flowcharts shown in FIGS. 3 and 4.

(Initialization and water storage hot water storage operation) (Figure 3) Hot water supply system S
When the power is connected to 19B, the hot water system S will not start.
), the opening degree of the flow rate adjustment valve (46) is initialized (199).

In this initialization, when the power is turned on, the 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 regulating valve is rotated from the fully open position in the closing direction for the above-mentioned time 173 or from the fully closed position in the open 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 the lower limit float switch 13a is turned OFF, and a water cutoff/new hot water signal is output to the shower device 55 side (213), and the mixed hot water is Prohibit dispensing.

On the other hand, the water supply tank 13 is supplied with water from the water supply pipe 16 via the ball tap 15, and the water level rises.
When the lower limit float switch 13a is turned on (200)
, drives the water supply pump 21 and the water supply pump 32 for the water heater.

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 be turned OFF. Also, since the water does not flow, the float The switch 24 is also turned off (203), and the water supply pump 21 is stopped (204).
.

Note that the above pressure is applied to the accumulator 26 and the check valve 23.
This is maintained 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 part of the water that has flowed into the water supply tank 13 is
The water supply pump 32 for the water heater supplies hot water to the hot water w&11, and the hot water becomes high temperature and starts storing hot water in the hot water tank 14 (20
2).

Then, when the level of hot water in the hot water tank 14 rises and reaches a certain level, the output of the water level sensor 14b switches (
205), the hot water supply pump 43 is driven (206), and the flow rate adjustment valve 46 is operated to adjust the amount of hot water supplied to the hot water mixing faucet 19 (206).

At this time, if the mixed hot water on-off valve 53 is closed, the pressure in the secondary hot water pipe 42 will rise, and the pressure switch 48 will turn OFF.
Then, since there is no flow of hot water, the flow inch 47 is also turned off, and the hot water supply pump 43 is stopped (20B).

Note that the above pressure is applied to the accumulator 50 and the auxiliary tank 49.
and is held by the check valve 45 until the mixed hot water on-off valve 53 is opened.

When the level of the hot water tank reaches the level at which the water supply pump for the water heater should be driven (213), the water supply tank 13 and the hot water supply tank 14 contain enough water and high temperature hot water for hot water supply and hot water supply. , hot water from the shower device 55 is enabled, and the switching signal already output to the shower device 55 is canceled (214).

In addition, the level of hot water in the hot water tank 14 is
When the upper limit of the storage capacity is reached, the upper float switch 1
4a turns on (215), water supply pump 3 for water heater
2 is stopped (216).

Then, when the water supply tank 13 is filled with water (210), 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) When the mixed hot water on-off valve 53 is opened and the use of the shower device 55 is started (300), the pressure switches 25.48 on the water side and the hot water side are turned ON (301). ), the water supply and hot water supply pump 2143 is driven (302), and the mixed hot water and water at the set temperature are supplied to the shower device 155 via the hot water mixer faucet 19.
Start water supply/hot water supply by discharging water from (3)
03).

In this state, depending on the flow rate of the mixed hot water, the pressure switch 25.48 on the water side and the hot water side may be turned off (305
), but since each flow switch 24.47 is turned on (304), the water supply and hot water supply pumps 21.43 continue to be driven.

Furthermore, at the same time as the hot water pump 43 is started, the flow rate adjustment valve 46
Rotate 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 (306), and if the level falls below the water heater water pump drive level, the water heater water pump 32 is turned on. Drive (3
07) Start storing hot water in the hot water tank 14 (30B
).

Next, when the use of the shower device 55 is temporarily stopped (30
9) The water side and hot water side pressure switch 25.48 and each flow switch 24.47 are turned OFF (310)
, stop the water supply and hot water pump 21.43 (311
).

In this state, the water supply pump 43 is stopped, so the water flow valve 46 is kept fully open.

Then, when the use of the shower device 55 is resumed (3
12) Pressure switch 25.48 on water side and hot water side is O
N (313), the water supply or hot water supply pump 21.43 is driven (314) to discharge mixed hot water at the set temperature from the shower device 55 via the hot water mixing faucet 19, thereby supplying water or hot water. (315).

In this state, the pressure switches 25.48 on the water side and the hot water side may be turned OFF depending on the flow rate of the mixed hot water (317), but since the flow switch 24.47 is ON (316), the water supply, The hot water pumps 21 and 43 continue to be driven.

Further, as described above, the water flow valve 46 rotates from the fully closed position to the fully open position at the same time as the hot water supply pump 43 is started.

During the above hot water dispensing, the amount of hot water coming out from the hot water mixer faucet 19 was too large.
The output from the hot water tank 14 is hot water I! When the supply amount exceeds the island's supply from 11, the amount of hot water stored decreases and the hot water tank 14
level decreases.

Then, when the same level falls below the hot water supply amount switching level, the water level sensor 14b detects this (318), the flow rate adjustment valve (46) throttles the flow rate (319), and the hot water tank 14
At the same time, the shower equipment 5
A switching signal is output to the 5 side (319).

When the water level in the hot water tank 14 rises and reaches a level that drives the water supply pump for the water heater, the flow rate adjustment valve 46
Rotate it 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 (320
), the water side and hot water side flow switches 24.47 are turned OFF (321), the water supply and hot water supply pump 21.43 are stopped (322), and the process returns to step (208°).

(Thermal operation of the hot water tank) Kawane said that in the operation of the hot water system S where it is possible to always enjoy showers, etc. at an appropriate temperature, the hot water tank 14
The hot water in the hot water supply tank 14 is kept warm by the heat retention heater 39 attached to the hot water inlet portion 36a of the primary side hot water supply piping 36 to the hot water supply tank 14.

That is, the conditions for controlling the heat retention heater 39 are as follows:
4b indicates the pump stop level or higher.

Then, the subroutine SRI shown in FIGS. 3 and 5
, the temperature detected by the temperature sensor 14c fixed at the bottom of the hot water tank 14 is, for example, 56°C±2°C.
When the temperature falls below (400Y), the power supply to the heat retention heater 39 is started (401), and when the temperature reaches 59°C±2°C (402), the power supply is stopped (403).

In this way, the temperature sensor 14
By controlling the temperature according to c, the temperature of the hot water in the hot water tank 14 can be maintained within a constant temperature range at all times.

Therefore, it is possible to reliably prevent low-temperature hot water from being sprayed onto the user from the shower device, etc., and the shower device can be used.

(Water Heater Misfire Detection Operation) In addition, in the operation of the hot water supply system S described above, for some reason, the hot water supply I! When the burner No. 11 has misfired, this is detected by the misfire detection means, and based on the detection output, the control device 60 is caused to output a signal to stop the drive to the water supply pump 32 for the water heater, The water supply pump 32 can be controlled to stop driving.

That is, in the subroutine SR2 of the flowchart shown in FIG. 3 and the sixth time, at the same time as driving the water supply pump 32 for the water heater (501), the timer is turned on.

After that, for example, after 90 seconds, the temperature sensor 14c starts detecting the hot water temperature in the hot water tank 14 (502), and for example, when the detected temperature is 42±2°C or less, the water pump 32 for the water heater is stopped. (504).

Therefore, it is possible to reliably prevent cold water from being supplied from the water heater 11 to the hot water tank 14.
The temperature of the hot water stored in the hot water tank 4 can be maintained at a sufficiently high temperature. As a result, it is possible to reliably prevent low-temperature hot water from being sprayed onto the user from the shower device, etc., and the user can always enjoy a shower at an appropriate temperature.

Note that the stoppage of the water supply pump 32 for the water heater can be canceled by turning off the operation of the remote control panel (not verbally accepted) connected to the control device and then turning it on again.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the conceptual configuration of a hot water supply system that can be safely operated 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 tank, and Figs. 3 to 6 are illustrations of the hot water supply system. Flowchart for explaining system operation, No. 7
The figure is a conceptual configuration explanatory diagram of a conventional hot water supply system. In the figure, S: Hot water supply system 1O: Water supply pressurizing device 11; Water supply machine 12: Casing 13: Water supply tank 14: Hot water tank 14c: II degree sensor 19: Hot water mixer faucet 21: Water supply pump 30: Water supply pipe for water heater 32: Water supply pump for water heater 36: Primary side hot water supply pipe 39; Heat retention heater 42: Secondary side hot water supply pipe 43: Hot water supply pump diagram

Claims (1)

[Scope of Claims] 1. 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 that is equipped with a water supply pump for the water heater in the middle, and the water outlet of the water heater is connected to the primary side hot water supply. In a hot water system that is connected to the hot water inlet of a hot water tank by a pipe, and the hot water outlet of the hot water tank is connected to the hot water source by a secondary hot water pipe that is equipped with a hot water pump in the middle, the primary hot water pipe or the hot water tank A temperature sensor is provided along with a heat retention heater, and a control device capable of outputting an energization signal to the heat retention heater and a drive stop signal to the water supply pump for the water heater based on the detected value of the temperature sensor. A hot water supply system that can be operated safely.