JPH0436541A - Heat keeping device for bath tub - Google Patents

Abstract

PURPOSE:To make a proper time interval of sensing hot water temperature and improve an accuracy of keeping temperature by a method wherein in the even that an output value of a hot water temperature setting device is high and that an output value of a temperature sensing means is low, a standby time is made short and in turn in the event that an output value of the hot water temperature setting device is low and that an output value of the temperature sensing means is high, the standby time is set long. CONSTITUTION:A heat keeping device is comprised of a temperature sensing means 4 for sensing a surrounding air temperature or a temperature at a temperature varying part approximating to the surrounding air temperature and a hot water temperature setting part 5 for setting a temperature of hot water stored in a bath tub B. A standby time T is calculated by an arithmetic circuit 6 in response to an output from the hot water setting device 5 and another output from the temperature sensing means 4. 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 the output value of the temperature sensing means 4 is low. In turn, when the output value of the hot water temperature setting device 5 is low and the output value of the temperature sensing means 4 is high, the arithmetic circuit 6 is operated to set the standby time T long. Then, a temperature sensing operation and a reheating operation are performed in response to the standby time T set in this way.

Description

[Detailed Description of the Invention] [Field of Application and Summary of the Invention] The present invention relates to a heat retention device in a bathtub, and particularly to a heat retention device in a bathtub device in which the interior of the bathtub is circulated and heated by a bath pot installed in parallel with the bathtub. , in a type of heating device that intermittently detects the temperature of water in the bathtub and reheats the inside of the bathtub according to the detection result, the temperature retention accuracy can be improved by optimizing the time interval of the water temperature detection. The aim is to improve

[Prior art and its! ! ! Ft] As a device to keep the inside of the bathtub warm, after heating the inside of the bathtub to a predetermined temperature, it detects the temperature of the water inside the bathtub at regular intervals, and reheats (reheats) the inside of the bathtub according to the detection results. It is known that the format is 2-9333.
It is proposed in the Publication No.

As shown in Fig. 5, this is a so-called forced circulation type in which a bathtub (B) and a bath heat exchanger (1) are connected by a circulation circuit (2) equipped with a pump (P). This is a bath kettle, and after a predetermined amount of hot water is stored in the bathtub and the temperature of the water in the bathtub is heated to a predetermined temperature, the circulating circuit (2) is A system is adopted in which the temperature of the water in the bathtub is measured by an inserted temperature sensor (S), and the inside of the bathtub is reheated to a set temperature according to the temperature measurement result.

In other words, after a certain period of time has elapsed after the heat is heated, the pump (P) is operated without operating (heating) the heat exchanger to guide the hot water in the bathtub to the circulation circuit (2), and thereby the temperature of the water in the bathtub is detected. do. If this detected temperature is a certain temperature lower than the set temperature (permissible temperature), the heat exchanger (1) is operated (heated) to reheat the inside of the bathtub (B) and reverse the temperature. Second, if the detected temperature is higher than the allowable temperature, forced circulation by the pump (P) is stopped without reheating. Thereafter, the above operation is repeated after a certain period of time has elapsed. As a result, the temperature of the water in the bathtub (B) is maintained within the range from the set temperature to the allowable temperature.

However, with this conventional method, after firing, the pump (
P) is operated and the operation stop time (
Since the standby time (standby time) and the standby time after the subsequent temperature measurement operation are set to a constant value, the standby time may be too long or too short depending on the season or the set temperature in the bathtub (B). There is an inconvenience that the temperature of the hot water in (B) is significantly lower than the above-mentioned allowable temperature.

This is because, although the above waiting time is set to a constant value, the degree of fall in the bathtub water temperature is affected by the season (outside air) and the set temperature, so even if the temperature drops to near the allowable temperature difference, the This is because if the temperature is not below the allowable temperature, reheating is not performed, and the temperature continues to drop until the next temperature measurement, and the state where the temperature is significantly lower than the allowable temperature continues for a certain period of time. In addition, in extremely cold weather, the temperature may already be significantly lower than the allowable temperature at the time of temperature measurement.

The present invention has been made in view of this point, and is a bathtub of the type in which the inside of the bathtub (B) is circulated and heated by a heat exchanger (1), and the inside of the bathtub (B) is set. After heating the water to the desired temperature or storing the set amount of hot water at the set temperature,
After the standby time (T) has elapsed, the hot water in the bathtub (B) is forcibly circulated through a circulation circuit (2) equipped with a pump (P), the temperature of the water in the bathtub (B) is measured, and the temperature is measured according to the measured temperature value. Bathtub (
B) In the bathtub heating device J, which reheats the inside of the bathtub and thereafter performs this temperature measurement operation and reheating according to the temperature measurement value at the above-mentioned standby time interval, The objective is to prevent a significant drop in the temperature of the hot water in the bathtub.

[Technical Means] The technical means of the present invention taken to solve the above problems include a temperature detecting means (4) for detecting the outside air temperature or a temperature of a temperature change part that approximates this, and a hot water temperature setting device (5) for setting the temperature of hot water stored in the water temperature setting device (5);
4) and an arithmetic circuit (6) for setting a standby time (T) from the output of the hot water temperature setting device (5). When the output value is high or when the output value of the temperature detection means (4) is low, the waiting time (T) is set short; conversely, when the output value of the hot water temperature setting device (5) is low and the output value of the temperature detection means (4) is low, the waiting time (T) is set short. When the output value of (4) is high, the standby time (T) is set to be long, and the temperature measurement operation and reheating operation are advanced according to the output from this calculation circuit (6). That's J. (See Figure 1) [Operation] The above 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) and the output from the temperature detection means (4). Moreover, this arithmetic circuit (6) sets the waiting 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 detection means (4) is low; , when the output value of the hot water temperature setting device (5) is low and when the output value of the temperature detection means (4) is high, it operates to set the waiting time (T) longer. Therefore, when the outside temperature is low, such as in winter, or when the bathing temperature is set on the high temperature side, the standby time (T) is set short. In other words, the bathtub (
If the degree of temperature drop in B) from the set temperature to the allowable temperature, which is a certain temperature lower than the set temperature, is significant, the waiting time (T) is set short. Conversely, when the outside temperature is high, such as in summer, or when the bathing temperature is set on the low temperature side, the waiting time (T) is set longer. In other words,
If the degree of temperature drop in the bathtub (B) is slow, the waiting time (T) will be set long.

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

Note that even if the bath temperature setting is changed or the outside temperature changes during the heat retention, the standby time (T) will be newly set as described above.

[effect] Since the present invention has the above configuration, it has the following unique effects.

The waiting time (T) is set to a predetermined value depending on whether the degree of temperature drop in the bathtub (B) is significant or slow.
The standby time (T) has been optimized, and the bathtub (B
) The inconvenience of a significant drop in the water temperature inside the tank is eliminated, and the accuracy of heat retention is improved.

Even if the outside temperature or the set temperature changes during heat retention, the corresponding standby time (T) is set, so the heat retention accuracy is improved in this respect as well.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 2 to 4.

The bathtub of the embodiment shown in FIGS. 2 and 3 is a forced circulation heating type bathtub, and a heat exchanger (1) is inserted in a circulation circuit (2) together with a pump (P). Also, bathtub (B)
It is a so-called automatic hot water filling type bath device that stores hot water at a predetermined temperature in the bath, and a heat exchanger (11) for supplying hot water is housed in the vessel separately from the heat exchanger (1). , When hot water heated to a set temperature by the heat exchanger (11) during the hot water filling operation is supplied to the bathtub (B) via the hot water filling circuit (12), and when the amount of hot water filled reaches a predetermined value, It is configured to automatically stop the filling operation.

Therefore, in this embodiment, a hot water filling valve (13) is inserted into the hot water filling circuit (12), and a water level detector (21) for detecting the water level in the bathtub (B) is installed in the circulation circuit (2). established,
An operation switch (31) for filling hot water is provided on the operation panel (3), and these parts are interconnected via a control device (C).

Therefore, the hot water filling valve (13) is opened by the operation output of the operation switch (31), and the gas circuit to the burner (10) provided in the heat exchanger (11) is opened and closed to start combustion according to the set temperature. The gas valve (15) that controls the gas amount is opened and this burner enters the combustion state, and the gas valve (15)
), the amount of combustion gas is set to a predetermined value. From then on, the output signal from the water level detector (21) is sent to the control device (C).
When this pressure value reaches the set value, the hot water filling valve (13) is activated by the output from this control device (C).
and the gas valve (15) is closed.

Next, a temperature sensor (S) for detecting the temperature of water in the bathtub (BJ) is inserted into the circulation circuit (2) as in the conventional example, and this is the temperature detection means (4) described above.

It is manually operated by a control device (C) containing a hot water temperature setting device (5) and an arithmetic circuit (6). Further, in this embodiment, the temperature detection means (4) is configured to detect the temperature of water entering the heat exchanger (11), which changes in temperature close to the outside temperature, and the water supply to the heat exchanger (11) is The circuit includes temperature detection means (4
) is provided, and the output from this temperature sensor (41) is manually input to the control device (C).

In addition, 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 this is performed by the output from the control device (C). (
During reheating in B), this gas valve (17) is opened and the burner (16) enters the combustion state. Also, hot water temperature setting device (
5) is arranged on the operation panel (3) as in the conventional example described above.

Next, a microcomputer is employed as the control device (C) of this embodiment, and performs control operations as shown in FIG. In particular, in this embodiment, the program portion corresponding to the calculation circuit (6) calculates the waiting time (T) based on the difference between the temperature set by the hot water temperature setting device (5) and the temperature detected by the temperature sensor (41). The composition is as follows.

The operation of each part will be explained below according to the flowchart shown in FIG.

Prior to filling with hot water, the bathing temperature, that is, the temperature of the 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 output from the control device (C) opens the hot water filling valve (13) and the gas valve (15) to open the heat exchanger (1).
1) is in operation and hot water at the set temperature (to) is in the bathtub (B).
). Water level detector (
21), and when the water level in the bathtub (B) reaches the set water level, the hot water filling operation is stopped by the output of the control device (C). At the time of filling the hot water, the temperature (tl) of the water entering the heat exchanger (11) is detected by a temperature sensor (4th step) at the same time as the filling starts.

In this embodiment, the following calculation is performed in the arithmetic circuit (6) based on this inlet water temperature (tl) and the set temperature (to), and the waiting time (T) is calculated based on the inlet water temperature (1+) and the set temperature (t
o) is set as a function of

T 38 minutes - ((to-tl) /3 ) minutes...■
Pump (P) after the time set by definition has passed
is driven to circulate hot water in the bathtub (B), and the temperature of the water in the bathtub (B) is detected by a temperature sensor (S). This detection requires a certain amount of time, so the circulation is performed during the temperature measurement time (
To) continues. Thereafter, the detected temperature (tc) is determined by a comparison circuit different from the calculation circuit (6) to the set temperature (t
It is determined from o) whether the temperature is lower than a certain temperature (1℃), and if the detected temperature (1c) is lower than the set temperature by, for example, 1℃, the pump (P) continues to operate. The gas valve (17) is then opened, the burner (16) is combusted, and the inside of the bathtub (B) is circulated and heated by the heat exchanger (1).
When the temperature (tc) reaches the set temperature (to), the reheating operation is stopped by the output of the control device (C), and the pump (P)
operation will also be suspended. After that, it enters the next standby state.

In addition, the detected temperature (1C) after the waiting time (T) has elapsed.
If is higher than (to-t), the operation of the pump (P) is also stopped and the pump enters the next standby state.

By repeating the above operations, the temperature inside the bathtub (B) will be (
to-1).

In addition, in the above example, the constant "38" and r of formula (■)
3 J is determined by experiment, and if this constant is used, when the temperature is measured after the waiting time (1 c) has elapsed, the detected temperature (1c) will drop slightly lower than (to-t). Most of the time there were.

In the above embodiment, a hot water filling method using a heat exchanger (11) was adopted to store hot water at a set temperature in the bathtub (B). The present invention can also be adopted in a bath device in which hot water in a bathtub (B) is heated to a set temperature by circulating heating by a heat exchanger (1) after storing water to a set water level.

Furthermore, in the above embodiment, when the hot water in the bathtub (B) becomes low during bathing, the hot water is filled up by the hot water filling valve (13), or after the necessary amount of water is increased, the hot water is refilled by the heat exchanger (1). In some cases, the item may be reheated by burning it, but in this case, a new waiting time (T) is set, and the previously set waiting time (T) is canceled. In addition, once the former hot water filling is resumed, the water temperature at this time (
tl) is also updated, and the waiting time (T) is set based on this updated inlet water temperature (tl).

! Look at my stomach! Next, it is also possible to change the control operations after the temperature measurement operation after the standby time (T) has elapsed (the program shown below with ■ in FIG. 3) as shown in FIG. 4.

In the control shown in the figure, the detected temperature (tc) is
If the detected temperature (tc) is lower than (tO-1>), reheating is started and the same operation as in the above embodiment proceeds, but if the detected temperature (tc) is higher than (tO-1), the pump (
While the operation of P) continues, the detected temperature (tc) is constantly monitored, and this detected temperature (tc) becomes (t.

-1) The reheating operation will proceed when the temperature becomes lower than -1). Therefore, in a device that adopts this configuration, the waiting time (T) is repeated multiple times and the bathtub (
B) The inconvenience of an excessive drop in temperature inside can be reliably eliminated.

In any of the above embodiments, a heat exchanger (
1) was inserted, but the pump (P) and temperature sensor (S)
The heat exchanger (1) may be inserted into a circulation circuit provided separately from the circulation circuit in which the heat exchanger (1) is inserted.

In other words, the circulation circuit (2) may be used only for detecting the temperature of hot water in the bathtub.

Furthermore, the constants of the equation (2) are not limited to those in the above embodiments, and may be other predetermined constants depending on the capabilities of the instrument. Furthermore, the waiting time (T) may be calculated based on the outside air temperature instead of the inlet water temperature (t,).

[Brief explanation of drawings]

yt diagram is an explanatory diagram of the principle of the present invention, FIG. 2 is an overall explanatory diagram of an embodiment of the present invention, FIG. 3 is a flowchart diagram of a control program used therein, and FIG. 4 is an explanatory diagram of main parts of another modification example. ,
FIG. 5 is an explanatory diagram of a conventional example. B ... Bathtub 1 ... Heat exchanger T ... Standby time P ... Pump 2 ... Circulation circuit 4 ... Temperature detection means 5 ... Hot water temperature setting device 6 ... Arithmetic circuit

Claims (1)

[Claims] A bathtub of the type in which the inside of the bathtub (B) is circulated and heated by a heat exchanger (1), and after the inside of the bathtub (B) is heated to a set temperature, or a set amount of hot water at the set temperature is stored. Then, after the waiting time (T) has elapsed, the hot water in the bathtub (B) is forcibly circulated through the circulation circuit (2) equipped with a pump (P), and the temperature of the water in the bathtub (B) is measured. In the bathtub heating device, the inside of the bathtub (B) is reheated according to the outside temperature or an approximate temperature thereof, and thereafter, this temperature measurement operation and reheating according to the measured temperature value are performed at the waiting time interval. a temperature detection means (4) for detecting the temperature of the temperature change section; a water temperature setting device (5) for setting the temperature of hot water stored in the bathtub (B); and an output of the temperature detection means (4). It is equipped with an arithmetic circuit (6) that sets a standby time (T) from the output of the hot water temperature setting device (5), and this arithmetic circuit (6) is configured to operate when the output value of the hot water temperature setting device (5) is high. When the output value of the temperature detection means (4) is low, the waiting time (T) is set short; conversely, when the output value of the hot water temperature setting device (5) is low and the output value of the temperature detection means (4) is set short. If the value is high, the bathtub heat retaining device operates to set a longer standby time (T), and progresses the temperature measurement operation and reheating operation according to the output from the arithmetic circuit (6).