JPH0792275B2 - 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 of a type in which the bathtub is circulated and heated by a bath kettle juxtaposed in the bathtub. , In a heat retention device of a type that intermittently detects the hot water temperature in the bathtub and reheats the bathtub according to the detection result, the heat retention accuracy is improved by optimizing the time interval of the 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). Of the bathtub, in which a predetermined amount of hot water is stored in the bathtub and the temperature of the hot water in the bathtub is raised to a predetermined temperature. The temperature sensor (S) inserted is used to detect the temperature of the hot water in the bathtub, and the system for reheating the bathtub to the set temperature according to the result of the temperature detection 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. Then, if the detected temperature is lower than a temperature (permissible temperature) lower than the set temperature by a constant temperature, the heat exchanger (1) is put into an operating (heating) state and the inside of the bath (B) is reheated. When the detected temperature is higher than the allowable temperature, the forced circulation by the pump (P) is stopped without reheating. After that, the above operation is repeated after a certain time has elapsed. As a result, the hot water temperature in the bathtub (B) is maintained in the range of the set temperature to the allowable temperature.

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 season or the set temperature 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 during the warming operation.

This is because the waiting time is set to a fixed value, but the degree of decrease in hot water in the bathtub is affected by the season (outside air temperature) and the set temperature, and even if the temperature falls near the allowable temperature difference, the allowable temperature This is because when the temperature is not below, reheating is not executed, and the temperature drop continues until the next temperature measurement and the state in which the temperature is significantly lower than the allowable temperature continues for a certain period of time.
Also, in severe cold, etc., a situation may occur in which the temperature is significantly lower than the allowable temperature during the temperature measuring operation.

The present invention has been made in view of the above point, and is a bathtub of the type in which the inside of the bathtub (B) is circulated and heated by the heat exchanger (1), and the inside of the bathtub (B) is set. After heating to the temperature or after storing the set amount of hot water at the set temperature,
After the lapse of the standby temperature (T), the hot water in the bathtub (B) is forcibly circulated in the circulation circuit (2) equipped with the pump (P) to measure the hot water temperature in the bathtub (B). In the bathtub (B) for reheating the bathtub (B), and thereafter performing reheat in accordance with the temperature measurement operation and the temperature measurement value at the waiting time interval. It is an object of the present invention to prevent a drastic decrease in hot water temperature in the bathtub due to changes in water temperature.

[Technical Means] The technical means of the present invention taken in order to solve the above-mentioned problem is "a temperature detecting means (4) for detecting the temperature of an outside air temperature or a temperature changing portion similar thereto, and a bathtub (B). A hot water temperature setting device (5) for setting the hot water temperature stored in the storage unit, and an arithmetic circuit (6) for setting the standby time (T) from the output of the temperature detecting means (4) and the output of the temperature setting device (5). ) And 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 when the output value of the temperature detecting means (4) is low. On the contrary, when the output value of the hot water temperature setting device (5) is low and the output value of the temperature detecting means (4) is high, the standby time (T) is set to be set longer, and this calculation is performed. The temperature detecting operation and the reheating operation are made to proceed according to the output from the circuit (6). "
(See FIG. 1) [Operation] The technical means of the present invention operates as follows.

The waiting time (T) is calculated by the arithmetic circuit (6) based on the output from the hot water temperature setting device (5) and the output from the temperature detecting means (4). Further, 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 when the output value of the temperature detecting means (4) is low, and vice versa. When the output value of the hot water temperature setting device (5) is low and the output value of the temperature detecting means (4) is high, the standby time (T) is set to be long. Therefore, the standby time (T) is set short when the outside air temperature is low, such as in winter, or when the bathing temperature is set to the high temperature side. That is, when the degree of temperature drop until the hot water temperature in the bathtub (B) drops from the set temperature to the allowable temperature lower than the set temperature by a certain temperature, the standby time (T) is set to be short. On the contrary, when the outside air temperature is high, such as in summer, or when the bathing temperature is set to the low temperature side, the standby time (T) is set to be long. That is, when the temperature drop rate of the temperature in the bathtub (B) 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.

It should be noted that the standby time (T) is newly set as described above even when the bathing set temperature is changed or the outside air temperature is changed during heat retention.

[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.

Even if the outside air temperature or the set temperature changes during the heat retention, the waiting time (T) corresponding to the change 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 the heat exchanger (1) is inserted in the circulation circuit (2) together with the pump (P). Also, bathtub (B)
There is a so-called automatic water filling type bath device for storing hot water of a predetermined temperature, and a heat exchanger (11) for refueling is housed in the body (K) separately from the heat exchanger (1). , Hot water heated to a set temperature by the heat exchanger (11) by the water filling operation is supplied to the bathtub (B) through the water filling circuit (12),
Moreover, when the amount of water filling reaches a predetermined value, the water 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 gas temperature is changed according to the set temperature. A gas valve (15) for controlling the amount of combustion gas is opened to bring the burner into a combustion state, and the gas valve (15) sets the amount of combustion gas to a predetermined value. After that, the output signal from the water level detector (21) is monitored by the control device (C), and when this output value reaches a set value, the output from the control device (C) causes the water filling valve (13) and The gas valve (15) is closed.

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 control device (C) that incorporates the hot water temperature setting device (5) and the arithmetic circuit (6). Further, in this embodiment, as the temperature detecting means (4), the temperature of water entering the heat exchanger (11) that changes in temperature close to the outside air temperature is detected, and the water supplied to the heat exchanger (11) is detected. The circuit is provided with a temperature sensor (41) as a temperature detecting means (4).
The output from 1) is input to the control device (C).

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. In particular, in this embodiment, in the program portion corresponding to the arithmetic circuit (6), the waiting time (T) is calculated by the difference between the temperature set by the hot water temperature setting device (5) and the temperature detected by the temperature sensor (41). It is as a configuration.

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 controller (C), the gas valve (15) is opened, the heat exchanger (11) is in an operating state, and the hot water of the set temperature (t ₀ ) is in the bathtub. (B). Water is detected in the bathtub (B) 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). When filling the water, the temperature sensor (41) detects the water temperature (t ₁ ) entering the heat exchanger (11) at the same time as the start of the water filling.

In this embodiment, the calculation circuit (6) performs the following calculation based on the input water temperature (t ₁ ) and the set temperature (t ₀ ) so that the standby time (T) is equal to the input water temperature (t ₁ ) and the set temperature (t). It is set as a function of t ₀ ).

T = 38 min _{- {(t 0 -t 1)} / 3} content ...... if before the time set by formula elapses pump (P)
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 measurement time (T ₀ ). After that, the detected temperature (t _C ) is changed to a set temperature (t ₀ ) by a comparison arithmetic circuit different from the arithmetic circuit (6).
It is determined whether the temperature is lower by a certain temperature (1 ° C) from the temperature. If the detected temperature (t _C ) is lower than the set temperature by 1 ° C, for example, the pump (P) continues to operate. The gas valve (17) is opened, the burner (16) burns, and the inside of the bath (B) is circulated and heated by the heat exchanger (1) to be reheated. When the detected temperature (t _C ) reaches the set temperature (t ₀ ) 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 ₀ -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 ₀ -1).

In the above embodiment, the constants of the expressions "38" and "3"
Is determined by experiment, and when adopting this constant, when the temperature is measured after the waiting time (T) has elapsed,
In most cases, the detected temperature (t _C ) was slightly lower than (t ₀ -1).

In the above-mentioned embodiment, the hot water filling method using the heat exchanger (11) is used to store the hot water at the set temperature in the bathtub (B). 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 by circulating water by the heat exchanger (1) after storing the water to the set water level.

Furthermore, in the above-mentioned embodiment, when the bath water (B) becomes less hot during bathing, it is filled with water by the water filling valve (13) or after the required amount of water has been added, it is reheated by the heat exchanger (1). There is a case of reheating by the above, but in this case, the waiting time (T) is newly set and the waiting time (T) set up to that point is canceled. When the former filling of water is restarted, the incoming water temperature (t ₁ ) at this time 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 temperature measurement temperature (t _C ) is lower than (t ₀ -1) at the time of temperature measurement, reheating is started and the same operation as in the above-described embodiment proceeds, but When the temperature (t _C ) is higher than (t ₀ -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 ₀ -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 ( 4) ... Temperature detecting means (5) ... Hot water temperature setting device (6) ... Calculation circuit

Claims (1)

[Claims] 1. A bath kettle of a type in which the inside of the bathtub (B) is circulated and heated by a heat exchanger (1), which is after heating the inside of the bathtub (B) to a set temperature or at a set temperature. After storing the set amount of water, the hot water in the bathtub (B) is forcibly circulated in the circulation circuit (2) equipped with the pump (P) after the lapse of the waiting time (T) to measure the hot water temperature in the bathtub (B). Then, the bathtub (B) is reheated according to the temperature measurement value, and thereafter, the temperature measurement operation and the reheating according to the temperature measurement value are performed at the standby time interval. A temperature detecting means (4) for detecting an air temperature or a temperature of a temperature changing portion similar thereto, a hot water temperature setting device (5) for setting a hot water temperature stored in the bathtub (B), and the temperature detecting means ( 4)
And an arithmetic circuit (6) for setting the standby time (T) from the output of the hot water temperature setting device (5), the arithmetic circuit (6) being the output value of the hot water temperature setting device (5). Is high and the output value of the temperature detection means (4) is low, the standby time (T) is set short, and conversely, when the output value of the hot water temperature setting device (5) is low and the temperature detection means (4). When the output value of) is high, the operation is performed to set the standby time (T) longer, and the temperature detecting operation and the reheating operation according to the output from the arithmetic circuit (6) are made to proceed. Insulation device.