JPH11270902A - Warm water supply for bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the remaining water quantity in a bath tube to be calculated, irrespective of the existence of a warm water flowing from an warm water outlet in a two-can two-channel one-burner bath water supply. SOLUTION: In the bath water supply, the thermistors 14, 20 are disposed at the upstream and downstream of a heat exchanger 40 of circulation piping 12 for an external circulation of a bath water, thereby detecting the inlet and outlet temps. of the heat exchanger 40. Based on the temp. difference between them and circulation flow rate by a circulating pump 16, the heat quantity applied to the circulating water is calculated, and based on the calculated heat quantity, the remaining water quantity in the bath tub 10 is obtained, without stopping the circulating pump 16, even if warm water is being fed from a water outlet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system for a bath, and more particularly, to a method for calculating remaining water in a bathtub.

[0002]

2. Description of the Related Art
As a hot water supply facility with a hot water filling function, a parallel running pipe type (two cans, two water channels, one burner type) as shown in FIG. 9, that is, a circulation pipe for externally circulating bath water, and another hot water supply pipe Are partially run in parallel, and a common burner and a heat exchanger section are provided in the parallel running section.

In FIG. 1, reference numeral 200 denotes a bathtub, and reference numeral 202 denotes a circulation pipe for taking out bathwater in the bathtub 200, circulating the bathwater outside, and returning the bathwater to the bathtub 200. A bath thermistor 204, a circulation pump 206, and a bath water flow switch 208 are provided on the circulation pipe 202.

[0004] Reference numeral 210 denotes a hot water supply pipe which replaces the water flowing from the water supply port 212 with hot water and outputs the hot water from the hot water outlet 214 to supply the water to a discharge portion such as the faucet 215 of the faucet 213. Is provided. This hot water supply pipe 210
A flow sensor 216, a water supply thermistor 218, a hot water thermistor 220, a hot water supply confirmation switch 222, and the like are provided above.

The circulation pipe 202 and the hot water supply pipe 210 run parallel to each other in parallel running sections 224 and 226, and have a common heat exchanger section 228 and a common burner (here, In this example, an oil burner 230 is provided.

Heat exchanger 228 in hot water supply pipe 210
A supply pipe 232 extends from a downstream portion of the water supply port 212, and a distal end thereof is connected to the circulation pipe 202.
Water or hot water heated by the heat exchanger unit 228 is supplied to the bathtub 200 through the supply pipe 232 and the circulation pipe 202. Here, an electromagnetic valve 234 and a check valve 236 are provided on the supply pipe 232. In the drawing, reference numeral 238 denotes a control unit for controlling the operation of the apparatus.

In the case of this hot water supply facility, hot water can be filled in the bathtub 200 through the supply pipe 232 and the circulation pipe 202 on the bath side. That is, this hot water supply facility has a hot water filling function.

By the way, when this hot water is filled, the bathtub 20
If the bath water remains in 0, that is, if there is remaining water in the bathtub 200, if hot water is filled by an amount corresponding to the set full water amount, the amount of hot water in the bathtub 200 becomes too large, It may overflow from the bathtub 200 in some cases.

For this reason, in this hot water supply equipment, the control unit 238 calculates the residual water amount by calculation, and fills the hot water by an amount obtained by subtracting the residual water amount from the set full water amount. Then, thereafter, the bath water is circulated through the reheating pipe line, that is, through the circulation pipe 202, and the circulated water is heated by the burner 230 and the heat exchanger unit 228, and finally the bath water is heated to a preset boiling temperature. I was trying to boil the water.

Here, the calculation of the residual water amount has conventionally been performed as follows. That is, while circulating the residual water in the bathtub 200 by the circulation pump 206 through the circulation pipe 202, the circulating water is heated by the burner 230 and the heat exchanger unit 228, and the temperature rise of the residual water after a predetermined time is measured by the bath thermistor 204. The remaining water amount is calculated by calculation based on the detected temperature rise, the amount of heat applied in the burner 230 and the heat exchanger unit 228, and the heating time. The amount of residual water, the amount of residual water temperature rise, the amount of heat added, and the heating time are in the relationship of the following equation 1. Therefore, the amount of residual water is obtained by knowing the amount of residual water temperature rise, the amount of heat added, and the heating time. Can be. Q = (K × ΔT) / Δt (Equation 1) where Q: residual water amount, ΔT: heating time, Δt: temperature rise,
K: calorie applied by burner (kcal / h)

By the way, in the case of the above-mentioned two-can, two-water-path, one-burner type hot water supply system, no water flows inside the hot water supply pipe 210,
The amount of heat K added by the burner 230 is all
There is no problem if it is added to the 2 side,
When the hot water is supplied from 14 and the amount of heat from the burner 230 is also applied to the water in the hot water supply pipe 210, it is not known how much heat is applied to the circulating water in the circulation pipe 202. I will. Therefore, when tapping is being performed from tap hole 214, the remaining water amount cannot be obtained by the calculation based on Equation 1 above.

Therefore, in the conventional hot water supply equipment, when hot water is being supplied from the hot water outlet 214, the circulation pump 206 is stopped to enter a standby state. Had to do it. However, if tapping from tap hole 214 is performed frequently, it is difficult to calculate the remaining water, and it takes a long time to calculate the remaining water.

[0013]

The invention of the present application has been made to solve such a problem. According to the first aspect of the present invention, there is provided a bath water supply system comprising: (a) a circulating pipe for returning bath water to an upper tub taken out of the bath; (b) a circulating pump provided on the circulating pipe; A hot water supply pipe different from the circulation pipe, running partly in parallel with the pipe, changing the water flowing from the water supply port into hot water in the parallel running section and tapping out of the hot water outlet,
(D) a common burner and heat exchanger for the circulation pipe and the hot water supply pipe for heating the water in the circulation pipe and the water in the hot water supply pipe in the parallel running section; A supply pipe for communicating a downstream portion of the parallel running section and a circulation pipe on the bath side to supply hot water into the bathtub through the circulation pipe, and (f) a control section for controlling operation of the device. In the hot water supply equipment provided with, a first temperature sensor is provided in an upstream portion of the heat exchanger portion in the circulation pipe, and a second temperature sensor is provided in a downstream portion thereof, and the inlet temperature to the heat exchanger portion and the second temperature sensor are provided. The outlet temperature from the heat exchanger section is detected by the sensors, and the control section is controlled by the heat exchanger section based on the temperature difference between the inlet temperature and the outlet temperature and the circulating flow rate by the circulating pump. In the water on the circulation pipe side After calculating the amount of heat applied, the remaining amount of water in the bathtub is calculated based on the calculated amount of heat, the rising temperature of the bath water detected by the first temperature sensor or a separate bath water temperature sensor, and the heating time. The residual water calculation mode is executed.

According to a second aspect of the present invention, in the bath hot water supply system according to the first aspect, the control unit may include: (a) no hot water is supplied from the hot water outlet; When it is added to the water in the whole, the remaining amount of the bath water is calculated based on the heat amount and the heating time known in advance and the rising temperature of the bath water detected by the first temperature sensor or the separate bath water temperature sensor. On the other hand, (b) after the tapping of hot water from the tapping port is started, without stopping the circulation pump, based on the temperature difference between the inlet temperature and the outlet temperature of the circulation pipe and the circulation flow rate by the circulation pump. The amount of heat applied to the circulation pipe is calculated, and the calculation is switched so as to calculate the amount of residual water based on the calculated amount of heat, the rise temperature of the residual water, and the heating time.

[0015] The bath hot-water supply system according to claim 3 is characterized in that:
In any one of the above, the control unit may be controlled by the first temperature sensor and the second temperature sensor under a state in which the water flow in the hot water supply pipe is stopped and under a state in which the burner is set and burned with a known amount of heat. Calculating a temperature difference between the detected inlet temperature and the outlet temperature, obtaining a circulating flow rate by the circulating pump based on the temperature difference and the known set heat amount, and performing the calculation based on the obtained circulating flow rate; It is characterized by having done.

According to a fourth aspect of the present invention, in the third aspect, the control unit executes the operation mode of the circulating flow rate by operating an operation unit.

According to a fifth aspect of the present invention, there is provided a bath hot water supply system comprising: (a) a circulation pipe for returning bath water to an upper bath tub taken out; (b) a circulation pump provided on the circulation pipe; In a bath hot water supply system comprising: a burner and a heat exchanger section for heating water in the pipe; (d) a supply pipe for supplying hot water to the bathtub; and (e) a control section for controlling operation of the apparatus. After pouring the set amount of water or pouring the set temperature into the bathtub in the state of the above, the bath water is circulated by the circulating pump through the circulating pipe and circulated in the circulating pipe by the burner and the heat exchanger unit. The bath water is heated with a known amount of heat, the bath water having the known initial temperature and the amount of water is boiled by the set rise temperature, and the calculation is performed based on the rise temperature of the bath water, the added amount of heat, and the heating time. The amount of residual water determined by the above, and the bath water actually injected or poured After calculating a correction coefficient α that matches the actual bath water amount with the calculated residual water amount, the control unit sets a residual water calculation automatic correction mode in which the α is incorporated into the arithmetic expression of the residual water amount. The control unit executes a residual water calculation mode for executing the residual water calculation based on the corrected arithmetic expression.

The bath hot water supply system according to claim 6 is characterized in that, in claim 5, the control unit executes the residual water calculation automatic correction mode by operating an operation unit.

The bath hot water supply system according to claim 7 is characterized in that:
Wherein a manual input section for a correction coefficient for setting or changing and adjusting the correction coefficient of the residual water calculation formula is provided.

An eighth aspect of the present invention is directed to the bath hot water supply apparatus according to the seventh aspect, wherein the manual input unit is provided in a remote control device.

According to a ninth aspect of the present invention, in the bath hot-water supply equipment according to the seventh aspect, the manual input unit is provided on a control board.

[0022] The bath hot water supply equipment of claim 10 is claim 7-
9, wherein a display unit for displaying a correction coefficient is provided in addition to the manual input unit.

[0023] The bath hot water supply equipment of claim 11 is claim 10.
, Wherein the display unit is also used as a display unit in a remote control device.

[0024] The bath hot water supply equipment of claim 12 is claim 1
In any one of the eleventh and eleventh aspects, the control unit is configured to cause the bath to be filled with hot water at the set hot water temperature by subtracting the calculated remaining water amount from the set full water amount set as the appropriate bath water amount. Features.

[0025] The bath hot water supply equipment of claim 13 is claim 1
In any one of 12, the residual water in the bathtub is circulated by the circulation pump through the circulation pipe without performing the residual water calculation and pouring of the shortage of the bath water based on the residual water calculation. And a selection operation unit for selecting a mode in which heating is performed to a set boiling temperature by heating by the heating unit.

[0026]

As described above, in the bath hot water supply system of the first aspect, the first temperature sensor is provided upstream of the heat exchanger section and the second temperature sensor is provided downstream thereof in the circulation pipe for circulating bath water externally. A temperature sensor is provided to detect the inlet temperature to the heat exchanger section and the outlet temperature from the heat exchanger section, and based on the temperature difference between the inlet temperature and the outlet temperature and the circulation flow rate by the circulation pump. The amount of heat added to the circulating water (bath tub residual water) in the heat exchanger section, and the amount of residual water in the bath tub is determined based on the calculated amount of heat. In the case of the hot water supply equipment, even if the hot water is supplied from the hot water outlet, that is, even if the amount of heat from the burner is added to the water flowing in the hot water supply pipe, the remaining water amount can be calculated without any trouble. .

Therefore, while hot water is being supplied from the hot water outlet 214 as in the prior art, the circulation pump 206 is stopped to enter a standby state, and after the hot water is stopped from the hot water outlet 214, the remaining water amount is calculated. There is no need to perform the operation, and the amount of residual water can be calculated in a short time, and thus the time required for filling with water and boiling can be shortened.

In the bath hot water supply system according to the second aspect, when no hot water is supplied from the hot water outlet and the amount of heat for heating by the burner is added to the water in the circulation pipe as a whole,
While calculating the remaining water amount based on the previously known heat amount, the heating time and the rising temperature of the bathtub remaining water, tapping from the tap starts, and the heat amount for heating by the burner is reduced with respect to the water in the hot water supply pipe. Was added to the water on the circulation pipe side due to the temperature difference between the inlet and outlet temperatures of the water flowing through the circulation pipe and the outlet temperature without stopping the circulation pump, and the circulation flow rate. The calorific value is calculated, and the calculation is switched so as to calculate the remaining water amount based on the calculated calorific value.

The arithmetic method of detecting the temperature difference between the inlet temperature and the outlet temperature and calculating the amount of heat added to the water on the circulation pipe side, and calculating the amount of residual water based on this, includes the following methods. The calculation method is more complicated than the calculation method of calculating the residual water amount based on the heating time and the known heat amount of the burner.

Therefore, in the present invention, the amount of heat added is calculated based on the detected values of the inlet temperature and the outlet temperature only when necessary, that is, only when hot water is supplied from the hot water outlet.
While the remaining water amount is calculated based on the calculated value, if there is no need to do so, that is, if tapping from the tap is not performed, the conventional calculation method, that is, the temperature rise of the remaining water and The remaining water amount is calculated based on the heating time and the known calorific value of the burner. In the case of this bath hot-water supply system, it is possible to eliminate waste such as performing complicated calculations at all times.

In the bath hot water supply system according to claim 2,
The calculation can be switched based on the detection of water flow in the hot water supply pipe by the flow sensor provided on the hot water supply pipe side.

By the way, even if the same circulation pump is used, the circulation flow rate of the circulation pipe by the circulation pump may vary depending on the length of the circulation pipe and the installation condition of the bath hot water supply equipment on site.

Here, the bath hot water supply system of claim 3 is
By setting the burner and burning with a known amount of heat in a state where the water flow in the hot water supply pipe is stopped, the water is circulated by the temperature difference between the inlet temperature and the outlet temperature of the water in the circulation pipe and the known amount of heat. The circulation flow rate by the pump is first determined, and the above calculation is performed based on the determined circulation flow rate. According to the bath hot water supply system of the third aspect, the length of the circulation Regardless of the installation condition of the bath hot water supply equipment, the remaining water amount can be properly calculated.

According to the fourth aspect of the present invention, there is provided a bath hot water supply system in which the control unit executes the calculation mode of the circulating flow rate by an operation of the operation unit. The circulation flow rate is obtained by operating the operation unit, and thereafter, the calculation of the remaining water amount can be appropriately performed based on the obtained circulation flow rate.

The circulating flow rate obtained here can be stored in a nonvolatile memory. The stored circulation flow rate data can be recalled or written as needed.

By the way, the circulation flow rate is obtained as described above,
Even when the remaining water amount is calculated based on the obtained circulation flow value, the installation position and orientation of the circulation port in the bathtub are poor or the piping is long, and the bath water in the bathtub is If the stirring is not performed smoothly, it may occur that only the area around the circulation port is warmed up and the other parts remain tepid.

When the residual water amount is calculated in such a state,
It is not possible to properly detect the rise in the temperature of the bath water, and in some cases, the remaining water amount is judged to be small and the hot water is added excessively, causing the problem that the hot water overflows from the bathtub in the worst case. obtain.

Here, the bath hot water supply system of claim 5 is
After pouring the set amount of water or pouring the set temperature into the empty bathtub, while circulating this through the circulation pipe, heating with a burner to perform bath water (remaining water) with a known water amount and temperature. Boiling up by the set temperature rise, calculating the residual water amount by the temperature rise, the added amount of heat and the heating time,
Then, the calculated remaining water amount is compared with the above-mentioned known bath water amount (remaining water amount) to obtain a correction coefficient α that matches them, and the α is incorporated into an arithmetic expression to perform the remaining water operation. In such a case, the stirring position of the circulation port is poor, or the piping is long, and the installation conditions are poor. Even if it is not possible, it is possible to properly obtain the remaining water amount by adding the above correction, and thus it is possible to appropriately perform the subsequent filling.

The bath hot-water supply system according to the fifth aspect can be suitably applied to the above-described parallel-running-tube-type hot-water supply system, that is, a two-can, two-water-path, one-burner type hot-water supply system. It is also possible to apply to the type of hot water supply equipment.

In the case of a two-can, two-water-path, one-burner type bath water heater, when calculating the correction coefficient α by calculation, the burner is burned in a state where the water flow in the hot water supply pipe is stopped, and the amount of heat from the burner is calculated. Can be entirely added to the water on the circulation pipe side. However, even in other cases, it is possible to properly obtain the correction coefficient α by heating the water in the circulation pipe with a known amount of heat.

Next, the bath hot water supply system according to the sixth aspect is such that the control section executes the residual water calculation automatic correction mode by operating the operation section. The operation of the unit can cause the control unit to execute the residual water calculation automatic correction mode.

According to a seventh aspect of the present invention, a manual input unit for the correction coefficient of the residual water arithmetic expression is provided, so that the correction coefficient can be easily set or changed and adjusted.

Here, the manual input section can be provided in a remote control device. This remote control device is usually installed in an easy-to-operate place in the bathroom, so that manual input of a correction coefficient can be easily performed. In this case, the operation switch for another purpose provided in the remote controller can be used also as the manual input section for the correction coefficient.

Alternatively, the manual input section may be provided on a control board. This correction coefficient is a value specific to each bath hot water supply facility, and the correction coefficient is substantially determined in a state where the installation is completed, that is, the correction coefficient does not need to be frequently changed and set. The purpose can be sufficiently achieved simply by providing the control board on a simple control board.

Further, when such a manual input section of the correction coefficient is provided, it is desirable to provide a display section for displaying the set or changed correction coefficient in addition to the manual input section. By providing such a display unit, the following change setting of the correction coefficient can be accurately performed.

When such a display section is provided, the display section can also be used as a display section of the remote control device.

In the twelfth aspect of the present invention, the bath water supply system is configured such that hot water at a set temperature is poured into a bathtub by an amount obtained by subtracting the calculated remaining water amount from a set full water amount set as an appropriate amount of bath water. In the case of a bath hot water supply system, automatic hot water can always be filled to an appropriate set full water amount regardless of the amount of residual water.

On the other hand, the bath hot water supply equipment of claim 13 is provided with a selection operation section for selecting a mode in which the remaining water is directly heated to the set boiling temperature without performing the above-mentioned calculation of the remaining water and pouring in the shortage of the bath water. In this way, if it is not desired to fill the shortage, it is possible to use the bath by boiling the remaining water to the boiling temperature.

[0049]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a parallel running pipe type, that is, a two-can, two-water-path, one-burner type bath hot-water supply system of the present embodiment, in which 10 is a bathtub, and 12 is a bathtub from the bathtub 10. It is a circulation pipe that is taken out, circulated outside, and returned to the bathtub 10 again. A first thermistor 14 as a first temperature sensor and a bath thermistor, a circulation pump 16, a bath water flow switch 18, and a second thermistor 20 as a second temperature sensor are provided on the circulation pipe 12.

Reference numeral 22 designates a hot water supply pipe which converts the water flowing from the water supply port 24 into hot water, supplies the hot water from the hot water outlet 26, and supplies the hot water to a discharge portion such as the faucet 27 of the water faucet 25. It is provided. On the hot water supply pipe 22, a flow sensor 28, a water supply thermistor 30, a hot water supply thermistor 32, and a hot water supply confirmation switch 34 are provided.

The circulation pipe 12 and the hot water supply pipe 22 partially run in parallel in the parallel running sections 36 and 38, and in the parallel running sections, a common heat exchanger section 40 and a burner (in this example, an oil burner). 42 are provided. A supply pipe 44 branches off and extends from a downstream portion of the heat exchanger section 40 in the hot water supply pipe 22, and a distal end side thereof is connected to the circulation pipe 12, specifically, a portion between the circulation pump 16 and the bath water flow switch 18. The water flowing from the water supply port 24 or the hot water heated by the heat exchanger section 40 is poured or poured into the circulation pipe 12 through the supply pipe 44 and further into the bathtub 10 through the circulation pipe 12. It is supposed to be. An electromagnetic valve 46 and a check valve 48 are provided on the supply pipe 44. In FIG. 1, reference numeral 50 denotes a control unit for controlling the operation of the apparatus, and reference numeral 52 denotes a remote controller.

In the hot water supply system of this embodiment, the control unit 50
Calculates the amount of remaining water in the bathtub 10 and then controls each part so that the bathtub 10 is automatically filled with water by subtracting the remaining water amount from the set full water amount. Further, when calculating the remaining water amount, the control unit 50 executes a first remaining water calculation mode and a second remaining water calculation mode.

Here, the first residual water calculation mode is for the tap hole 26.
The second remaining water calculation mode is a remaining water calculation mode when the hot water is not supplied from the hot water outlet 26, and the second remaining water calculation mode is a remaining water calculation mode when the hot water is supplied from the hot water outlet 26. This control unit 5
0 normally executes the first residual water calculation mode, and switches the residual water calculation mode to the second residual water calculation mode when tapping from the tap hole 26 is performed.

FIG. 2 is a flowchart specifically showing the control contents including the residual water calculation mode by the control unit 50. Hereinafter, the control contents of the control unit 50 will be described in detail with reference to the flowchart of FIG. As shown in the figure, in this example, first, the circulation pump 16 is turned on and the bath water (residual water) is stirred for one minute, and then the water flow in the circulation pipe 12 is detected by the bath water flow switch 18 (step S10, step S10). S
12, S14, S16), and when the water flow is detected, the burner 42 is burned to start the heating of the water in the circulation pipe 12, that is, boiling (step S18).

Subsequently, step S20 is executed, and it is determined whether or not the residual water is boiling up to the set boiling temperature. If the residual water has not yet risen to the set boiling temperature, step S38 is executed to determine whether or not the flow sensor 28 of the hot water supply pipe 22 has been turned on. That is, tap hole 2
It is determined whether or not there is a hot water from 6. And tap 2
When the tapping from No. 6 is not performed, the flow returns to step S20 again, and the same operation is repeated thereafter.

Then, when the remaining water is heated up to the set boiling temperature without hot water being supplied from the hot water outlet 26,
Subsequently, step S22 is executed to calculate the remaining water amount.
At this time, the remaining water amount is calculated by calculating the temperature increase Δt of the remaining water detected by the first thermistor 14 and the known burner 4.
2 and the heating time ΔT based on the above equation (1). That is, here, the first residual water calculation mode is executed.

Thereafter, when it is determined that the remaining water amount is equal to or less than the set full water amount, the shortage is filled in the bathtub 10 (steps S24 and S26). This filling is performed as follows. That is, the electromagnetic valve 46 on the supply pipe 44 is opened to change the water flowing from the water supply port 24 into hot water, and then the hot water is poured into the bathtub 10 through the circulation pipe 12 through the supply pipe 44. In addition, this hot water is filled with, for example, hot water of about 30 ° C. in a bathtub 10.
Pour the water.

When the filling is completed, the boiling is started, and when the bath water in the bathtub 10 is heated up to the set boiling temperature, the boiling is completed. S32, S34).
When boiling, the circulating water is heated by the burner 42 while circulating bath water (residual water) in the bathtub 10 through the circulation pipe 12 with the electromagnetic valve 46 on the supply pipe 44 closed. Here, whether the residual water has boiled up to the set boiling temperature can be detected by the first thermistor 14.

On the other hand, when it is determined in step S16 that the bath water flow switch 18 has not been turned on, that is, when the inside of the bathtub 10 is empty, the remaining water calculation and the addition of insufficient water are performed without any change. Water filling is performed from the empty state to the set full water amount (step S36). After that, the process from step S28 is executed.

If it is determined in step S38 that the flow sensor 28 has been turned on,
That is, when the hot water is being supplied from the hot water outlet 26, the arithmetic expression is switched (step S40), and then step S2 is performed.
The remaining water calculation in 2 is performed. That is, in this case, the second residual water calculation mode is executed.

The calculation of the residual water at this time is performed, for example, as follows. That is, the circulation flow rate L (liter / min) by the circulation pump 16, the outlet temperature from the heat exchanger section 40 detected by the second thermistor 20 is t ₂ , and the heat is output to the heat exchanger section 40 detected by the first thermistor 14. Assuming that the inlet temperature of the fuel cell is t ₁ , K ₀ (kcal / h) = (t ₂ −t ₁ ) × L × 60 (Equation 2) The remaining heat amount K ₀ is calculated, and the remaining water amount is calculated using the calculated heat amount K ₀ based on the relational expression of the above equation 1.

The circulating flow rate L may vary depending on the length of the circulating pipe 12 and other conditions for installing the hot water supply system on site. Therefore, in the present embodiment, when the second residual water calculation mode is executed, first, an accurate circulation flow rate L ₀ is obtained, and the calorific value K ₀ is obtained by the above equation 2 using the L ₀ .

The calculation of the circulation flow rate L ₀ can be performed as follows. For example, the remote controller 52 or another operating device is provided with an operation section for selecting a circulating flow rate calculation mode for obtaining the circulating flow rate L _0, and by operating the operating section, the control section 50 controls the circulating flow rate calculation mode. Is executed.

At this time, the controller 50 causes the circulation of the bath water only on the circulation pipe 12 side in a state in which the tapping from the tap hole 26 is stopped, that is, in a state in which the water flow in the hot water supply pipe 22 is stopped. Under this condition, the burner 42 is burned at a set combustion amount (for example, 20,000 kcal / h), and the thermistor 2
At 0 and 14, the outlet temperature t ₂ and the inlet temperature t ₁ of the circulating water are detected.

Then, based on the difference (t ₂ −t ₁ ) between t ₂ and t ₁ and the added constant heat quantity, the circulation flow rate L ₀ is calculated based on the following equation (3). L ₀ (liter / min) = 20,000 (kcal / h) / ((t ₂ −t ₁ ) × 60) (Equation 3) The outlet temperature t ₂ by the second thermistor 20 is shown in FIG. As shown, in order to stabilize after a certain period of time has elapsed since the burner 42 was ignited, the values of t ₂ and t ₁ after the outlet temperature t ₂ is stabilized are adopted.

The circulating flow rate L ₀ obtained here can be stored in a nonvolatile memory. The data of the circulation flow rate L ₀ stored can be made as a call or written as required.

As described above, according to the bath hot water supply system of this embodiment, even when hot water is supplied from the hot water outlet 26, that is, the amount of heat from the burner 42 is added to the water flowing through the hot water supply pipe 22. However, the remaining water amount can be obtained by calculation without any problem.

Accordingly, while hot water is being supplied from the hot water outlet 214 as in the prior art, the circulation pump 206 is stopped and the apparatus enters a standby state. It is not necessary to perform the operation, so that the residual water can be calculated in a short time, and thus the time required for filling and boiling can be shortened.

According to the bath hot water supply system of the present embodiment, the outlet 26
Calculates the quantity of heat K ₀ applied based on the detected value of the inlet temperature t ₁ and outlet temperature t ₂ only when the tapping has been performed from, while calculating the residual water amount on the basis of the calculated value, out When hot water is not discharged from the gate 26, the remaining water is calculated based on the conventional calculation method, that is, based on the temperature rise Δt of the remaining water, the heating time ΔT, and the known calorific value K of the burner. In addition, it is possible to eliminate waste such as performing complicated calculations at all times.

Further, according to the bath hot water supply system of this embodiment, the burner 42 is set and burns with a known amount of heat while the water flow in the hot water supply pipe 22 is stopped, so that the known amount of heat and the inlet temperature t ₁ are reduced. The circulation flow rate L ₀ by the circulation pump 16 is first determined from the temperature difference from the outlet temperature t _2, and the above calculation is performed based on the determined circulation flow rate L _0. It is possible to properly calculate the residual water amount regardless of the installation conditions of the bath hot water supply equipment at the site.

Further, according to the bath hot water supply system of the present embodiment, the control unit 50 causes the control unit 50 to execute the circulating flow rate calculation mode of the circulating flow rate L ₀ by operating the operation unit. The circulating flow rate L ₀ can be obtained in advance by operating the operation unit, and thereafter, the calculation of the residual water can be performed based on the obtained circulating flow rate L ₀ .

Further, according to the bath hot water supply equipment of this embodiment, hot water at a set temperature is poured into the bathtub by an amount obtained by subtracting the calculated remaining water amount from the set full water amount set as the appropriate amount of bath water. Regardless of the amount of residual water, automatic hot water can always be filled to the appropriate set full water level.

As described above, the position or orientation of the circulation port in the bathtub 10 is not good,
The bath water in the bathtub 10 may be agitated poorly depending on the installation conditions of the bath hot water supply equipment on site, such as when the bath water is long. In this case, it can happen that only the area around the circulation port is warmed up and the other parts remain tepid. In such a case, the temperature rise of the bath water (residual water) cannot be accurately detected in the calculation of the residual water, so that the calculated residual water value differs from the actual residual water amount. Can occur. Then, when the hot water is later filled, the hot water is excessively filled, and the bath water may overflow from the bathtub 10.

Therefore, in this embodiment, the control unit 50 executes a residual water calculation automatic correction mode in which the correction of the residual water calculation is automatically performed based on the operation of the operation unit, and is based on an arithmetic expression incorporating the correction coefficient. To calculate the remaining water. FIG. 4 is a flowchart showing the contents of execution of the residual water calculation automatic correction mode by the control unit 50. Hereinafter, the contents of the execution will be specifically described with reference to FIG.

First, in step S42, it is determined whether or not an operation unit for executing the residual water calculation automatic correction mode has been operated. As a result, if the operation unit has been operated, the operation is subsequently started. Is determined (step S46), and as a result, if the start operation is performed, then in step S48, the calculation of the correction coefficient is executed to calculate the correction coefficient α.

FIG. 4B shows the specific execution contents of step S48. As shown in FIG. 7B, in this step S48, first, the solenoid valve 46 on the supply pipe 44 is opened (step S48-1), and then the set water amount ( In this case, only 200 liters of water is poured or the set temperature is poured (step S48-2).

FIG. 5A shows the state in which the electromagnetic valve 46 is opened and the bathtub 10 is opened.
2 shows a state when water or hot water is being supplied.
In addition, when pouring into the bathtub 10 in step S48-1, the pouring is performed, for example, at a set boiling temperature −10 ° C.

When such pouring and pouring are completed,
Subsequent to step S48-2, the electromagnetic valve 46 is closed, the circulation pump 16 is turned on, the bath water in the bathtub 10 is circulated through the circulation pipe 12, and the burner 4 is turned on.
The integration of the combustion time of 2 is started. That is, the measurement of the heating time of the circulating bath water in the circulating pipe 12 by the burner 42 is started (step S48-3). FIG. 5B shows the state at this time.

When the temperature of the bath water (residual water) detected by the first thermistor 14 rises by the set temperature rise, for example, when the temperature rises to 40 ° C. which is the set boiling temperature, the integration of the combustion time is terminated. . That is, the measurement of the heating time is completed. At the same time, the circulating pump 16 is turned off, and the correction coefficient α is calculated based on the following equation 3 (step S48-5). 200 = Q ₁ × α (Equation 3) Here, Q ₁ is obtained by using the temperature rise of the bath water until boiling, the integrated value of the combustion time (heating time), and the known calorie of the burner 42. The remaining water amount calculated on the basis of the above equation 1 and the numerical value 200 in the equation 3 is the actual remaining water amount accommodated in the bathtub 12 as a result of pouring or pouring water into the bathtub 12.

After calculating the correction coefficient α in this manner, the control unit 50 executes a residual water calculation automatic correction mode in which the correction coefficient α is incorporated into the residual water calculation formula. The remaining water amount is calculated by the calculation formula (steps S48-6, S50). Here, the normal operation refers to a general operation in the use of the bath hot water supply equipment, such as hot water retention, additional heating, or hot water supply from the outlet 26.

In this example, after the operation unit for executing the residual water calculation automatic correction mode is operated (step S4).
2) If an operation for turning off (stopping) the operation is performed (step S44), the operation is turned off and the operation returns to the normal operation (steps S52 and S50).

If the operation unit for executing the residual water calculation automatic correction mode is not operated (step S42), the normal operation is continued as it is (step S5).
4) is done.

The operation unit for executing the residual water calculation automatic correction mode and the operation unit for starting the calculation can be provided in the remote controller 52 or another operation device, for example.

The above is an example in which the residual water calculation correction mode for obtaining the correction coefficient α is automatically performed by the control section 50. However, a manual input section for the correction coefficient is provided in the remote control device or other places. Therefore, the correction coefficient can be set or changed and adjusted at the input section.

FIG. 6 shows an example in which such a manual input unit is provided in the remote controller 52. In this example, a switch 54A for increasing the hot water supply temperature and a switch 54B for decreasing the hot water supply temperature are used to manually input the correction coefficient for the residual water calculation.
And the display unit 56 of the remote control device 52 serves as a display unit for displaying the input correction coefficient.

When inputting the correction coefficient manually, the user manually operates the manual input unit 54 of the remote controller 52 to switch to the residual water calculation correction mode, input a desired correction coefficient, and correct the residual water calculation. Do.

This correction coefficient is a value specific to each bath hot water supply facility, and is substantially determined when the installation is completed, that is, the correction coefficient does not need to be frequently changed and set. Therefore, the operation unit may be provided on the control board.

FIGS. 7 and 8 show an example in which the manual input unit is provided on the control board 58 of the control unit 50. FIG. FIG.
Is provided with a plurality of (three in this example) DIP switches 60 as manual input units for correction coefficients.
The correction coefficient is selected and adjusted by the combination of ON / OFF of each switch 60.

In this example, when all of the three switches 60 are turned off, the control unit 50 does not perform the remaining water calculation and injects the shortage of the bath water based on the calculation. While circulating by the circulating pump 16 through the circulating pipe 12, a mode in which heating is performed by the burner 42 and the heat exchanger unit 40 to boil to the set boiling temperature is executed. That is, in this example, the three switches 60 do not perform the residual water calculation, and also serve as a selection operation unit for selecting a mode in which the residual water in the bathtub 10 is directly heated to the set boiling temperature.

Next, in the example shown in FIG. 8A, a pair of input switches 62A and 62B and a changeover switch 64 are provided as a manual input section of the correction coefficient. Incidentally, 66 in the figure
Is a display unit for displaying a correction coefficient. Here, the changeover switch 64 is for switching between the normal mode and the residual water calculation correction mode. By operating the input switch 62A or the input switch 62B while the changeover switch 64 is switched to the residual water calculation correction mode, The numerical value of the correction coefficient displayed on the display unit 66 can be increased or decreased.

FIG. 8B shows a configuration in which a dial-type input operation unit 68 composed of a variable resistor is provided instead of the pair of input switches 62A and 62B of the manual input unit, and this input operation unit 68 is operated. Thus, the value of the correction coefficient can be changed. The other points are the same as those in FIG.

As described above, according to the bath hot-water supply system of this embodiment, the installation position and orientation of the circulation port are poor, or the piping is long, or other installation conditions are poor, so that the bath Even when the stirring of the bath water is not sufficiently performed, it is possible to properly obtain the remaining water amount by adding the above correction, and thus it is possible to appropriately perform the subsequent filling.

According to the bath hot-water supply system of this example, the operation of the operation unit allows the control unit 50 to execute the residual water calculation automatic correction mode as required.

Although the embodiments of the present invention have been described in detail, these are merely examples, and the present invention can be implemented in variously modified forms without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a two-can, two-water-channel, one-burner type bath hot-water supply system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control content including a residual water calculation mode of the bath water heater in FIG.

3 is a diagram showing a time change of a circulating flow rate calculation mode of the bath hot water supply equipment in FIG. 1 and a time change of a detected temperature of a thermistor.

FIG. 4 is a flowchart showing execution contents of a residual water calculation automatic correction mode of the bath hot water supply equipment in FIG.

FIG. 5 is a diagram showing a state of hot water filling and boiling of the bath hot water supply equipment in FIG. 4;

FIG. 6 is a diagram showing an example in which a manual input unit for a correction coefficient of the bath hot water supply equipment in FIG. 1 is provided in a remote control device.

FIG. 7 is a diagram showing an example in which a manual input unit of the bath water heater in FIG. 1 is provided on a control board.

FIG. 8 is a diagram showing another example different from FIG. 7;

FIG. 9 is a diagram showing a schematic configuration of a conventional bath hot water supply facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Bathtub 12 Circulation pipe 14 First thermistor (first temperature sensor) 16 Circulation pump 20 Second thermistor (second temperature sensor) 22 Hot water supply pipe 24 Water supply port 26 Hot water outlet 36, 38 Parallel running part 40 Heat exchanger part 42 Burner 44 supply pipe 50 control unit 52 remote control device 54A, 54B switch (manual input unit) 56, 66 display unit 58 control board 60 switch (manual input unit) 62A, 62B input switch (manual input unit) 64 changeover switch (manual input unit) ) 68 input operation unit (manual input unit) t ₁ inlet temperature t ₂ outlet temperature K, K ₀ calorimetry L, L ₀ circulation flow rate α correction factor

Claims (13)

[Claims] 1. A circulation pipe for returning bath water to an upper bath tub taken out, (b) a circulation pump provided on the circulation pipe, and (c) a partial parallel running with the circulation pipe. A hot water supply pipe different from the circulation pipe, wherein the water flowing from the water supply port is converted into hot water in the parallel running section and the hot water is supplied from the hot water outlet; and (d) water in the circulation pipe and hot water supply in the parallel running section. A burner and a heat exchanger section common to the circulation pipe and the hot water supply pipe for heating water in the pipe in common; and (e) a downstream section of the parallel running section and the circulation pipe on the bath side in the hot water supply pipe. And a heat pipe unit for supplying hot water into the bathtub through the circulation pipe, and (f) a control unit for controlling the operation of the apparatus. The first temperature sensor is provided in the upstream part, and the second temperature sensor is provided in the downstream part. The sensor detects the inlet temperature to the heat exchanger section and the outlet temperature from the heat exchanger section, and controls the control section to determine the temperature difference between the inlet temperature and the outlet temperature and the circulation. After calculating the amount of heat added to the water on the circulation pipe side in the heat exchanger section based on the circulating flow rate by the pump, the calculated amount of heat and the bath detected by the first temperature sensor or a separate bath water temperature sensor are used. A bath hot-water supply system wherein a remaining water calculation mode for calculating a remaining water amount in the bathtub based on a rising temperature of water and a heating time is executed. 2. The control device according to claim 1, wherein
(B) When the hot water is not supplied from the hot water outlet and the amount of heat for heating by the burner is added to the water in the circulation pipe as a whole, the known amount of heat, the heating time, and the first The remaining amount of the bath water is calculated based on the rising temperature of the bath water detected by a temperature sensor or a separate bath water temperature sensor, and (b) the circulation pump is started after the tapping from the tap hole is started. Without stopping the operation, the amount of heat applied to the circulating pipe side is calculated based on the temperature difference between the inlet temperature and the outlet temperature of the circulating pipe and the circulating flow rate by the circulating pump. A bath hot-water supply system wherein the calculation is switched so as to calculate the residual water amount according to the temperature and the heating time. 3. The method according to claim 1, wherein the control unit is operated under a state in which the flow of water in the hot water supply pipe is stopped and under a state in which the burner is set and burned with a known amount of heat.
A temperature difference between the inlet temperature and the outlet temperature detected by the first temperature sensor and the second temperature sensor is obtained, and a circulating flow rate by the circulating pump is obtained from the temperature difference and the known set heat amount. Bath hot water supply equipment characterized in that the above calculation is performed based on the circulating flow rate. 4. The bath hot-water supply facility according to claim 3, wherein the control unit executes the calculation mode of the circulating flow rate by operating the operation unit. 5. A circulation pipe for returning bath water to an upper bath tub taken out, (b) a circulation pump provided on the circulation pipe, and (c) heating water in the circulation pipe. A burner and a heat exchanger section, and (d) a supply pipe for supplying hot water to the bathtub;
(E) in a bath water heater provided with a control unit for controlling the operation of the device, after injecting water into the empty bathtub with a set water amount or pouring at a set temperature, the circulation through the circulation pipe; The circulation of the bath water by the pump and the heating of the circulation bath water in the circulation pipe by the burner and the heat exchanger unit are performed with a known calorific value, and the bath water having the known initial temperature and the water amount is increased by a set temperature increase. Boiling, comparing the remaining water amount obtained by calculation with the known heat amount and the heating time added to the rising temperature of the bath water and the amount of bath water actually injected or poured, the actual amount of bath water and After obtaining a correction coefficient α that matches the calculated residual water amount, the control unit executes a residual water calculation automatic correction mode in which the α is incorporated into the arithmetic expression of the residual water amount, and thereafter, based on the corrected arithmetic expression. Control the residual water calculation mode to perform residual water calculation Bath hot water supply equipment characterized by what the department has to do. 6. The bath hot water supply equipment according to claim 5, wherein the control unit executes the residual water calculation automatic correction mode by operating the operation unit. 7. The bath hot-water supply system according to claim 1, further comprising a manual input unit for a correction coefficient for setting or changing and adjusting the correction coefficient of the residual water arithmetic expression. 8. The bath hot-water supply system according to claim 7, wherein the manual input unit is provided in a remote control device. 9. The hot water supply system according to claim 7, wherein the manual input unit is provided on a control board. 10. The bath hot-water supply facility according to claim 7, further comprising a display unit for displaying a correction coefficient in addition to the manual input unit. 11. The bath hot-water supply equipment according to claim 10, wherein the display unit is also used as a display unit in a remote control device. 12. The bath according to claim 1, wherein the control unit controls the bathtub to supply hot water at a set hot water temperature by an amount obtained by subtracting the calculated remaining water amount from a set full water amount set as an appropriate bath water amount. Bath hot-water supply facilities characterized by pouring water. 13. The method according to any one of claims 1 to 12, wherein the residual water is not calculated and the shortage of bath water is not poured based on the calculation.
While circulating the residual water in the bathtub by the circulation pump through the circulation pipe as it is, a selection operation unit is provided for selecting a mode in which the water is heated to a set boiling temperature by heating by the burner and the heat exchanger unit. Bath water heater.