JPH0784941B2 - Bath warmer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat retention device in a bathtub, and more particularly to a heat retention device in a bath device in which the bathtub is circulated and heated by a bath kettle in which the bathtubs are arranged in parallel. , In a heat retention device of a type that intermittently detects the temperature of hot water in the bathtub and reheats the bathtub according to the detection result, by optimizing the time interval of hot water temperature detection It is intended to improve.

[Prior art and its problem] As a device for keeping the temperature inside the bathtub, after heating the temperature inside the bathtub to a predetermined temperature, the temperature of hot water in the bathtub is detected at regular intervals, and the bathtub is reheated according to the detection result ( It is known to use a reheating method, and is proposed in Japanese Utility Model Publication No. 2-9333.

As shown in FIG. 5, this is a so-called forced circulation type in which a bath (B) and a heat exchanger (1) for a bath are connected by a circulation circuit (2) equipped with a pump (P). This is a bath kettle, and a certain amount of hot water is stored in the bathtub and the hot water temperature in the bathtub is heated to the temperature set by the hot water temperature setting device (5). A temperature sensor (S) inserted into the circulation circuit (2) detects the hot water temperature in the bathtub at intervals, and a method of reheating the bath temperature to a set temperature according to the temperature detection result is adopted.

In other words, after a certain time has elapsed after heating, the pump (P) is operated without operating (heating) the heat exchanger to guide the hot water in the bathtub to the circulation circuit (2), which detects the hot water temperature in the bathtub. To do. And this detected temperature is the set temperature (t _O ).
If the temperature is lower than the constant temperature (allowable temperature (t _L )) by a certain temperature, the heat exchanger (1) is put into an operating (heating) state to reheat the bath (B), and conversely, the detected temperature ( t _C) stops the forced circulation by a pump (P) without reheating is higher than the allowable temperature (t _L). After that, the above operation is repeated after a certain time has elapsed. As a result, the temperature of the hot water in the bathtub (B) is maintained in the range from the set temperature (t _O ) to the allowable temperature (t _L ).

However, in this conventional device, the operation stop time (waiting time) until the pump (P) is operated and the temperature detecting operation is started after the heating, and the waiting time after the subsequent temperature detecting operation are set to be constant. Therefore, depending on the set temperature (t _O ) in the bathtub (B), the waiting time becomes too long or too short,
There is an inconvenience that the hot water temperature in the bathtub (B) drops significantly below the allowable temperature (t _L ) during the warming operation.

This is because the waiting time is set to be constant, but the allowable temperature (t _L ) is the set temperature (t _O ) set by the hot water temperature setting device.
Since it is decided to be a temperature that has dropped by a certain temperature from
The degree of decrease in the hot water temperature in the bathtub changes depending on the set temperature (t _O ), and the higher the set temperature, the more remarkable the decrease in the temperature in the bathtub (B). On the contrary, when the set temperature is low, the degree of decrease is relatively small. Therefore, when the set temperature (t _O ) is high, a situation may occur in which the temperature is already significantly lower than the allowable temperature (t _L ) when the waiting time (T) elapses. Also, when the set temperature (t _O) is low, even if dropped to the vicinity of the allowable temperature (t _L), reheating performed when much this can not in the allowable temperature (t _L) or less not,
Since the temperature drop continues until the next temperature measurement and the temperature is significantly lower than the allowable temperature (t _L ) for a certain period of time, the temperature is also significantly lower than the allowable temperature in this case.

The present invention has been made in view of the above point, and it is a bath cooker configured to circulate and heat the inside of the bathtub (B) by heat exchange (1), and set the bath temperature in the bathtub (B). After heating to the set temperature set by the vessel (5) or after storing the set amount of hot water at the set temperature, after a lapse of the waiting time (T), the circulation circuit (2) equipped with the pump (P) has a bathtub ( The hot water in B) is forcedly circulated to detect the hot water temperature in the bathtub (B), and if the difference between the set temperature and the detected temperature value is larger than a certain temperature, the hot water temperature in the bathtub (B) is detected. While reheating to the set temperature in the state, when the difference between the set temperature and the temperature detection value is smaller than the constant temperature, the reheating is not executed, and thereafter, the temperature detection operation and the temperature detection value are changed. In the bathtub adapted to perform the reheating according to the waiting time interval In raising device ", as its object to make it possible to prevent a change in significant reduction in tub indoor bath temperature according to the set temperature (t _O).

[Technical Means] The technical means of the present invention taken to solve the above problem is to provide an arithmetic circuit (6) for setting the standby time (T) from the output of the hot water temperature setting device (5) The circuit (6) sets the standby time (T) short when the output value of the hot water temperature setting device (5) is high, and conversely stands by when the output value of the hot water temperature setting device (5) is low. The operation is performed to set the time (T) to be long, and the temperature detecting operation and the reheating operation are advanced according to the output from the arithmetic circuit (6). "
(See FIG. 1) [Operation] The technical means of the present invention operates as follows.

The waiting time (T) is calculated by the calculation circuit (6) based on the output from the hot water temperature setting device (5). Further, the arithmetic circuit (6) sets the standby time (T) to be short when the output value of the hot water temperature setting device (5) is high, and conversely, the output value of the hot water temperature setting device (5) is low. In this case, it operates to set the waiting time (T) longer.

By the way, the set temperature (t _O ) changes depending on the taste or the season, but when the set temperature (t _O ) is set high, the temperature difference from the outside air temperature becomes large, and the temperature in the bathtub (B) becomes larger. The degree of descent becomes remarkable. On the contrary, when the set temperature (t _O ) is low, the temperature difference from the outside air temperature is small, so the temperature drop of the hot water in the bathtub (B) becomes slow.

Since the arithmetic circuit (6) operates as described above, the standby time (T) is set short when the temperature of the hot water in the bathtub (B) is significantly decreased, and conversely, in the bathtub (B). When the degree of temperature drop of the temperature is slow, the standby time (T) is set to be long.

Then, the temperature detecting operation and the reheating operation are advanced according to the standby time (T) set as described above.

Therefore, when the set temperature (t _O ) is high and the temperature drop is significant, the standby time (T) is set short, so when the standby time (T) elapses, the hot water temperature is lower than the allowable temperature (t _L ). On the contrary, when the set temperature (t _O ) is low and the temperature drop is slow, the waiting time (T) is set long, so when the waiting time (T) elapses. Since the temperature of the hot water in the tank has fallen to the allowable temperature (t _L ) without fail, reheating for heat retention is surely executed at this point and there is a large decrease in temperature due to the fact that reheating is not executed as in the past. It can be prevented.

In addition, even when the bathing set temperature (t _O ) is changed during the heat retention, the standby time (T) is newly set as described above.

[Effects] The present invention having the above-described configuration has the following unique effects.

Since the waiting time (T) is set to a predetermined value depending on whether the temperature drop in the bathtub (B) is remarkable or slow,
The waiting time (T) is optimized, the inconvenience that the hot water temperature in the bathtub (B) is significantly lowered during the warming is solved, and the warming accuracy is improved. Especially, under the condition that the room temperature in the bathtub is kept constant or the outside temperature change is small, the appropriate waiting time (T) changes sensitively depending on the set temperature change. It will be possible to respond.

Even if the set temperature (t _O ) changes during the heat retention, the waiting time (T) corresponding thereto is set, so that the heat retention accuracy is also improved in this respect.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

The bath tub of the embodiment shown in FIGS. 2 and 3 is a forced circulatory heating bath tub, and is inserted into the heat exchanger (1) together with the pump (P) in the circulation circuit (2). Also, bathtub (B)
There is a so-called automatic hot water filling type bath device for storing hot water of a predetermined temperature, and a heat exchanger (11) for hot water supply is housed in the body (K) separately from the heat exchanger (1). The hot water heated to the set temperature (t _O ) by the heat exchanger (11) by the hot water filling operation is supplied to the bathtub (B) through the hot water filling circuit (12), and the hot water filling amount is a predetermined amount. When the value is reached, the filling operation is automatically stopped.

Therefore, in this embodiment, the water filling valve (13) is inserted in the water filling circuit (12), and the water level detector (21) for detecting the water level in the bathtub (B) is installed in the circulation circuit (2). The operation panel (3) is provided with an operation switch (31) for filling water, and these units are mutually linked via the control device (C).

Therefore, the water filling valve (13) is opened by the operation output of the operation switch (31), the gas circuit to the burner (14) provided in the heat exchanger (11) is opened and closed, and the set temperature (t _{O 2} ), The gas valve (15) for controlling the amount of combustion gas is opened, and the burner enters a combustion state, and the gas valve (1
The amount of combustion gas is set to a predetermined value by 5). After that, the output signal from the water level detector (21) is changed to the control device (C).
When the output value reaches a set value, the water filling valve (13) and the gas valve (15) are closed based on the output from the control device (C).

Next, the temperature sensor (S) for detecting the temperature of the hot water in the bathtub (B) is inserted in the circulation circuit (2) as in the conventional example, and this is the temperature detecting means (4) described above. It is input to the controller (C) having the hot water temperature setting device (5) and the arithmetic circuit (6).

A gas valve (17) is inserted in the gas circuit to the burner (16) provided in the heat exchanger (1), and the opening and closing of the gas valve (17) is performed by the output from the control device (C). (B)
At the time of reheating the inside, the gas valve (17) is opened and the burner (16) is in a combustion state. Also, the hot water temperature setting device (5)
It is arranged on the operation panel (3) as in the above-mentioned conventional example.

Next, a microcomputer is adopted as the control device (C) of this embodiment, and the control operation as shown in FIG. 3 is performed.

The operation of each unit will be described below with reference to the flowchart shown in FIG.

Prior to filling water, the bathing temperature, that is, the temperature of hot water in the bathtub (B) is set by the hot water temperature setting device (5). After that, when you operate the operation switch (31) on the operation panel (3),
The water filling valve (13) is opened by the output from the control device (C), the gas valve (15) is opened, the heat exchanger (11) is in the operating state, and the hot water of the set temperature (t _O ) is in the bathtub. (B). The water in the bathtub (B) is detected by the water level detector (21), and when the water level in the bathtub (B) reaches the set water level, the filling operation is stopped by the output of the control device (C).

According to this input water temperature (t ₁ ) and the set temperature (t _O ), the following calculation is performed in the calculation circuit (6) in this embodiment, and the standby time (T) is set as a function of the set temperature (t _O ). To be done.

T = 75 min- (t _O / N) min ····· N = 1 Pump (P) when the time set by the previous equation has elapsed
Is driven to circulate the hot water in the bathtub (B), and the temperature sensor (S) detects the hot water temperature in the bathtub (B). Since this detection requires a certain time, the circulation continues for the temperature measuring time (T _O ). After that, the detected temperature (t _C ) is set to the set temperature (t _O ) by a comparison arithmetic circuit other than the arithmetic circuit (6).
Whether the temperature is lower than the constant temperature (1 ° C) from the
higher or lower than t _L ), and the detected temperature (t _C ).
If the temperature is 1 ° C lower than the set temperature (t _O ), the gas valve (17) is opened and the burner (16) burns while the pump (P) continues operating and the bath (B The inside of () is circulated and heated by the heat exchanger (1) and reheated. When the detected temperature (t _C ) reaches the set temperature (t _O ) by this reheating, the reheating operation is stopped by the output of the control device (C) and the operation of the pump (P) is also stopped. Then, the next waiting state is entered.

Even when the detected temperature (t _C ) is higher than (t _O −1) after the waiting time (T) has elapsed, the operation of the pump (P) is stopped and the next waiting state is entered.

By repeating the above operation, the temperature in the bathtub (B) is maintained at (t _O −1) or more and t _O or less.

In the above embodiment, the constants "75" and "N:
1 ”is determined by experiment. When this constant is adopted, when the temperature is measured after the waiting time (T) has elapsed, the detected temperature (t _C ) drops slightly below (t _O -1). I was doing most of the work.

In the above embodiment, the set temperature (t _O ) is set in the bath (B).
A hot water filling method using a heat exchanger (11) was used to store the hot water, but after the hot water or water was stored in the bathtub (B) up to the set water level, the heat exchanger (1 The present invention can also be applied to a bath device in which the hot water in the bathtub (B) is heated to a set temperature (t _O ) by circulation heating by (1).

Further, in the above embodiment, when the bath water (B) is running out of water during bathing, it is filled with water by the water filling valve (13), or after the necessary amount of water has been added, it is reheated by the heat exchanger (1). Reheating may be performed, but in this case, the waiting time (T) is newly set and the waiting time (T) set up to that point is canceled. Note that when the former water filling is restarted, the water temperature at this time (t ₁ )
Is also updated, and the waiting time (T) is set based on the updated incoming water temperature (t ₁ ).

Other Control Methods Next, it is possible to change the control operation (the following program in FIG. 3) after the temperature measurement operation after the lapse of the waiting time (T) as shown in FIG.

In the control shown in the figure, when the detected temperature (t _C ) is lower than (t _O -1) at the time of temperature detection, reheating is started and the same operation as in the above-mentioned embodiment proceeds, but When the temperature (t _C ) is higher than (t _O -1), the detected temperature (t _C ) is constantly monitored while the pump (P) continues to operate,
When the detected temperature (t _C ) becomes lower than (t _O −1), the reheating operation proceeds. Therefore, with this configuration, it is possible to reliably eliminate the inconvenience that the temperature in the bathtub (B) is excessively lowered by repeating the waiting time (T) a plurality of times.

In any of the above embodiments, the heat exchanger (1) is inserted in the circulation circuit (2), but heat exchange is performed in a circulation circuit provided separately from the circulation circuit in which the pump (P) and the temperature sensor (S) are inserted. The device (1) may be inserted. That is, the circulation circuit (2) may be a circulation circuit only for detecting the hot water temperature in the bathtub.

Further, the constants of the equations are not limited to those in the above embodiment, and may be other predetermined constants depending on the capability of the device. Furthermore, the waiting time (T) may be calculated based on the outside air temperature instead of the incoming water temperature (t ₁ ).

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention, FIG. 2 is an overall explanatory view of an embodiment of the present invention, FIG. 3 is a flow chart of a control program used for this, and FIG. Figure,
FIG. 5 is an explanatory view of a conventional example, in which (B) ... tub (1) ... heat exchanger (T) ... standby time (P) ... pump (2) ... circulation circuit ( 5) …… Hot water temperature setting device (6) …… Calculation circuit

Claims (1)

[Claims] 1. A bath kettle of a type in which the inside of a bath (B) is circulated and heated by a heat exchanger (1), and the set temperature inside the bath (B) is set by a hot water temperature setter (5). After the hot water of the preset temperature is stored or after the preset amount of hot water is stored, the hot water in the bathtub (B) is forced to circulate in the circulation circuit (2) equipped with the pump (P) after the lapse of the standby time (T). Temperature of the bathtub (B) is measured, and if the difference between the set temperature and the temperature detection value is larger than a certain temperature, the bathtub (B)
The inside is reheated to the set temperature in the hot water temperature detection state, and when the difference between the set temperature and the temperature detection value is smaller than the constant temperature, the reheating is not executed, and thereafter, the temperature detection is performed. In an in-tub warming device configured to perform the reheating according to the operation and the temperature detection value at the waiting time interval, an arithmetic circuit (6) for setting the waiting time (T) from the output of the hot water temperature setting device (5) is provided. Provided, this arithmetic circuit (6)
Sets the standby time (T) short when the output value of the hot water temperature setting device (5) is high, and conversely, when the output value of the hot water temperature setting device (5) is low, the standby time (T) Is operated so as to be set to be longer, and the temperature measuring operation and the reheating operation are advanced in accordance with the output from the arithmetic circuit (6).