JPH0462333A - Hot water feeding system having high temperature keeping heater - Google Patents

Abstract

PURPOSE:To enable a user to always enjoy a shower of adequate temperature by a method wherein a high temperature keeping heater is fixed to a connection part between a primary side hot water feeding pipe of a copper pipe and a hot water feeding tank and then electric power feed to the high temperature keeping heater is controlled by a control device only when a vacant heating preventive water level sensing signal is outputted by a lower limit water level sensor. CONSTITUTION:A hot water feeding system S keeps a temperature of hot water within a hot water feeding tank 14 by a hot temperature keeping heater 39 fixed to a hot water inlet port 36a of a primary hot water feeding pipe 36. The hot water temperature keeping heater 39 performs a hot water temperature keeping operation only when a vacant heating preventive water level sensing signal is outputted by a water level sensor 14b. As a detected value of temperature sensed by a temperature sensor 14c fixed to a lower part of the hot water feeding tank 14 becomes a predetermined lower limit value, electric power feed to a hot water temperature keeping heater 39 is started and then as the value becomes an upper limit value, the power feed is stopped. Due to this fact, it is possible to keep a temperature within the hot water feeding tank 14 always at its specified temperature range and then a hot water of low temperature is prevented from being jetted from a shower nozzle 53 or the like toward a user.

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. 6 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. 6.
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 hot water supply IIA is connected to the hot water inlet 106 of the hot water supply tank C by a first hot water supply pipe 105, and the hot water outlet 107 of the hot water supply tank C is connected to a second hot water supply pipe 108 which has a hot water supply pump P2 in the middle. By, hot water mixer faucet 109
It is connected to the shower device B, which is the hot water source, via the hot water source.

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 the low-temperature hot water is supplied to the shower device B when the shower device B is started to be used after that, and the hot water is supplied from the shower nozzle 100a. If it is squirted, it will cause discomfort to the user.

Therefore, conventionally, as shown in Part 6, a heating heater 110 is disposed inside the hot water tank C in a throw-in manner to maintain the temperature of the hot water in the hot water tank C.

However, such a heating method using the throwing method requires expensive safety devices such as bimetal 111 and other expensive overheating prevention devices and dry-boiling prevention devices, which increases the overall cost of the hot water supply system.

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 hot water 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 having a hot water pump in the middle, steel pipes are used. At the same time, an insulating heater is installed at the connection part of the primary hot water supply piping, which is made up of The present invention relates to a hot water supply system equipped with a heat retention heater, characterized in that it is equipped with a control device for controlling the temperature.

In addition, this hot water supply system has a bypass pipe installed in parallel with the hot water inlet bone of the primary hot water supply piping to form a heat retention circulation flow path, and a heat retention heater is installed at the hot water inlet part. Has characteristics.

Note that multifunctional shower equipment, bathtubs, etc. are mainly considered as sources of hot water that can be used with such hot water supply systems;
It goes without saying that it can 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 attached to the connection part of the primary hot water supply piping made of copper pipe or the like to the hot water tank, and the insulating heater The energization control is performed.

Therefore, the temperature of the hot water stored in the hot water supply tank can be maintained at a sufficient temperature at all times without using conventional expensive overtemperature rise prevention devices or dry boil prevention devices.

As a result, 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 from the shower nozzle, etc. to the user, and the user can always take a shower at an appropriate temperature. You can enjoy it.

In addition, in this hot water supply system, a bypass pipe is installed in parallel with the hot water inlet of the primary hot water supply piping to form a heat retention circulation flow path, and a heat retention heater is installed at the hot water inlet, so that the hot water tank is heated by natural convection. Since the hot water inside can be heated and kept warm, the hot water in the hot water tank can be maintained at a uniform temperature.

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

1 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 water heater system S includes a water supply hot water supply pressurizing device 10 and a gas combustion type hot water supply fa1 arranged in parallel.
1.

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 port tap 15 having a function of raising the upper limit water supply on its upper part, and the port 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. A relief valve 22, a check valve 23, and a flow switch 24 are attached, 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 made of a copper pipe or the like.

Further, a bypass pipe 38 is provided in parallel with the hot water inlet portion 36a of the primary 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 1
4 and the bypass piping 38 form a heat retention circulation flow path 40.

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 59 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 rate adjustment 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 water supply tank 13 via a circulation pipe 51.

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

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

[Explanatory diagram of water levels in the water supply tank and hot water tank] Figure 2A shows each water level in the water supply tank (13), which has a height of 87 bm and is 100 m1 above the bottom. Set the pump stop level (L2) to prevent air suction, and then set the lower limit float switch (
13a) is installed, and 161 at the same level (L2)
It stores water.

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 92N of water is stored.

Note that the upper space capacity above the upper limit level (Ll) is 191 m1 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) for preventing air suction at 100 mm above the bottom. ■Upward switching level (L
5), 570m+m above the water supply pump for the water heater (32
) and set the drive level (L4) of the previous water level sensor (1
4b) to detect each level (L4) (L5) (L6).

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

Note that the hot water tank (14) has a pump stop level (L).
6) It stores an effective capacity of 161 liters of hot water at the switching level (L5), 321 liters at the switching level (L5), and 9 ON at the upper limit level (L3), and the upper space capacity above the upper limit level (L3) is 191 mm in height. .

[How to operate a hot water supply system] Hereinafter, 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 will be described.
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 water flow valve (46) is initialized (199).

In this initialization, the valve (46) is rotated in the opening direction at the same time as the power is turned on, 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 to the closed direction for the above-mentioned time 173 or from the fully closed position to the open direction for the time 273.

In addition, in the initial state, since the water supply tank (13) and the hot water supply tank 14 are empty, 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 water supply pump 21 is driven, and the pressure in the water supply pipe 18 rises to the set value, turning off the pressure switch 25. Also, since the water does not flow, the water does not flow. 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 hot water is supplied to the water heater 11 by the water heater pump 32, becomes high temperature, and starts storing hot water in the hot water tank 14 (202
).

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 water flow 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.
(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 (20B).

Note that the above pressure is applied to the accumulator 50. 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 hot water in the hot water tank reaches a level that should drive the water supply pump for the water heater (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. Since the shower device 55 is in a state where hot water can be discharged from the shower device 55, the shower device 5 has already been installed.
The switching signal outputted to the 5 side is canceled (214).

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

When the water tank 13 is full, the ball tap 1
5 is closed (211), and the water storage/hot water storage operation is completed (212).

[Mixed hot water dispensing operation 1 (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/hot water supply is started by driving the water supply/hot water supply pump 2143 (302) and discharging mixed hot water at a set temperature from the shower device 55 via the hot/cold mixer faucet 19 (30).
3).

In this state, depending on the flow rate of mixed hot water, the pressure switches 25.48 on the water side and the hot water side may turn 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 (308
).

Next, when you temporarily stop using the shower equipment W55 (30
9) The water side and hot water side pressure switches 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 maintained in a fully closed state.

Then, when the use of the shower device 55 is resumed (3
12) The water side and hot water side pressure switches 25.48 are set to 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 addition, 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 (317), but the flow switch 2447 is turned on (
From 3f6), the water supply and hot water supply pump 2143 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.
When the amount of hot water discharged from the hot water supply tank 14 exceeds the amount of hot water supplied from the hot water supply ill, the amount of stored hot water decreases and the level of the hot water supply tank 14 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
), flow switches 24 and 47 on the water side and hot water side are OFF.
(321), the water supply and hot water supply pumps 21 and 43 are stopped (322), and the process returns to step (208').

(Thermal Insulation Operation of the Hot Water Tank) (Fig. 5) In the operation of the hot water supply system S described above, the hot water in the hot water tank 14 is is kept warm.

That is, the conditions for controlling the heat retention heater 39 are as follows:
Only when the water level detection signal for preventing dry boiling by the water level sensor L4b is output (only when the water level detected by the water level sensor L4b is higher than the pump stop level), the following heat retention operation is performed.

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

In this way, the power supply to the heat retention heater 39 is controlled by the temperature sensor 1.
4c, the temperature of the hot water in the hot water tank 14 can be maintained within a constant temperature range at all times.

As a result, it is possible to reliably prevent low-temperature hot water from being supplied from the hot water tank 14 to the shower device 53, etc., and then spouting out to the user from the shower nozzle 53, etc., and the user can always keep the hot water at an appropriate temperature. You can enjoy showers etc.

Furthermore, the temperature of the hot water stored in the hot water supply tank 14 can be maintained at a sufficient temperature at all times without using conventional expensive overtemperature rise prevention devices or dry boil prevention devices.

Further, in this hot water supply system, a bypass pipe 38 is provided in parallel with the hot water inlet port 36a of the primary hot water supply pipe 36 to form a heat retention circulation flow path 40, and a heat retention heater 39 is provided in the hot water inlet port 36a. Since the hot water in the hot water supply tank 14 can be heated and kept warm by natural convection, the hot water in the hot water supply tank 14 can be maintained at a uniform temperature.

Therefore, from this point of view, the low-temperature hot water is the shower device 11!
It is possible to reliably prevent water from being sprayed onto the user from the shower head 53, etc., and the user can always enjoy a shower or the like at an appropriate temperature.

Note that the energization of the heat-retaining heater 39 is not limited to the position of the subroutine SR in FIG. 3, but is always controlled as long as the hot water supply system S is powered on.

[Brief explanation of the drawing]

Fig. 1 is a conceptual configuration diagram of a hot water supply system according to the present invention, Figs. 2A and 2B are schematic diagrams of a water supply tank and the water level of the hot water tank, and Figs. 3 and 4 are illustrations of the operation of the hot water supply system. FIG. 5 is a flowchart for the heat retention operation, and FIG. 6 is a diagram illustrating the conceptual configuration of a conventional hot water supply system. In the figure, S: hot water system 10: water supply pressurizing device 11: water heater 12: casing 13: water tank 14; hot water tank 14b: water level sensor 14c: temperature sensor 19: hot water mixing faucet 21: water pump 30: water heater Water supply pipe 32: Water supply bomb 43 for water heater: Hot water pump

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 hot water tank of the primary hot water pipe In addition to attaching a heat retention heater to the connection part with the hot water supply tank, it is also equipped with a control device that controls power supply to the heat retention heater only when the water level sensor installed in the hot water tank detects that the water level is above the dry boil prevention water level. A hot water supply system equipped with a heat retention heater. 2. A hot water supply system equipped with a heat retention heater according to claim 1, wherein the primary hot water supply pipe is a copper pipe. 3. The heat retaining heater according to claim 1, characterized in that a bypass pipe is provided in parallel with the hot water inlet portion of the primary hot water supply piping to form a heat retention circulation flow path, and a heat retaining heater is provided in the hot water inlet portion of the primary hot water supply pipe. A hot water system equipped with