JPH0436542A - Hot temperature keeping device in bath tub - Google Patents

Abstract

PURPOSE:To provide a proper time interval for a sensing of hot water temperature and improve an accuracy in keeping hot water temperature by a method wherein a standby time is set short when an output value of a hot water temperature setting device is high and in turn when the output value of the hot water temperature setting device is low, the standby time is set long. CONSTITUTION:A standby time T is calculated by a calculation circuit 6 in response to an output from a hot water temperature setting device 5. The arithmetic circuit 6 sets the standby time T short when the output value of the hot water temperature setting device 5 is high and in turn when the output value of the hot water temperature setting device 5 is low, it sets the standby time T long. Accordingly, in the event that a degree of decreasing temperature in a bath tub B is gradually decreased, it sets the standby time T long. In addition, a temperature sensing operation and the 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 heat retention device that intermittently detects the four temperatures in the bathtub and reheats the interior of the bathtub according to the detection results, 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 problems] As a device for keeping the inside of a bathtub warm, after the inside of the bathtub is heated to a predetermined temperature, the f% temperature inside the bathtub is detected at fixed time intervals, and the inside of the bathtub is reheated according to the detection result. A type of heating (reheating) is known;
This is proposed in Publication No. 3.

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). It is a bath kettle, and after a predetermined amount of hot water is stored in the bathtub and the water temperature in the bathtub is heated to the temperature set by the hot water temperature setting device (5), which is the so-called boiling state, for a certain period of time. A system is adopted in which the temperature of the water in the bathtub is measured at intervals by a temperature sensor (S) inserted into the circulation circuit (2), and the inside of the bathtub is reheated to a set temperature according to the temperature measurement results.

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. Then, this detected temperature becomes the set temperature (to
), the heat exchanger (1) is operated (heated) and the inside of the bathtub (B) is reheated, and conversely, the detected temperature ( te)
is higher than the permissible temperature (tL, ), the 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) to the allowable temperature (11,).

However, with this conventional method, after firing, the pump (
P) is operated and the operation stop time (
Since the waiting time (waiting time) and the waiting time after the subsequent temperature measurement operation are set constant, the waiting time may be too long or too short depending on the season or the set temperature (to) in the bathtub (B). There is an inconvenience that the temperature of the water in the bathtub (B) drops significantly below the above-mentioned allowable temperature (1 L) during the heat-retaining operation.

This is because the waiting time is set constant, but the allowable temperature (11,) is the temperature set by the hot water temperature setting device (11,).
Since the temperature is determined to be a constant temperature drop from (to), the degree of fall in the hot water temperature in the bathtub varies depending on the set temperature (to), and the higher the set temperature, the more significant the degree of fall in the temperature in the bathtub (B) is. Therefore, when the set temperature (to) is low, even if the temperature has dropped to the vicinity of the allowable temperature (tL) difference, the temperature often does not fall below the allowable temperature (tL), and reheating is not performed at this time. First, the temperature drop continues until the next temperature measurement, and the state where the temperature is significantly lower than the allowable temperature (tL) continues for a certain period of time.

The present invention has been made in view of this point, and is a bathtub in which the inside of the bathtub (B) is circulated and heated by a heat exchanger (1), and the inside of the bathtub (CB) is heated with hot water. After heating the water to the temperature set by the temperature setting device (5) or storing a set amount of hot water at the set temperature, the bathtub is connected to the circulation circuit (2) equipped with the pump (P) after the waiting time (T) has elapsed. The temperature of the water in the bathtub (B) is measured by forced circulation of the hot water in the bathtub (B), and the inside of the bathtub (B) is reheated according to this temperature measurement value. An object of the present invention is to prevent a large drop in the temperature of hot water in a bathtub due to a change in the set temperature (TO) in a bathtub heat retention device that performs reheating at the standby time interval.

[Technical Means] The technical means of the present invention sought 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 arithmetic circuit (6) sets the waiting 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. One advantage is that the standby time (T) is set long so that the temperature measurement operation and the reheating operation proceed according to the output from the arithmetic circuit (6).

- (See Figure 1) [Effect] 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). 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 conversely, when the output value of the hot water temperature setting device (5) is low. In this case, the waiting time (T) is set longer.

By the way, the set temperature (to) changes depending on your preference or depending on the season, but if the set temperature (to) is set high, the temperature difference with the outside temperature will increase, and the degree of drop in the temperature inside the bathtub (B) will increase. becomes significant. Conversely, the set temperature (to
) is low, the temperature difference between the outside temperature and the outside temperature is small, so the temperature of the water in the bathtub (B) decreases slowly.

Since the arithmetic circuit (6) operates as described above, the waiting time (T) is set short when the temperature of the water in the bathtub (B) drops significantly; If the degree of temperature drop is slow, the standby time (T) will be set long.

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

Note that even if the bathing temperature setting (to) is changed during heat retention, the waiting 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, slow, or slow, so the waiting time (T) is properly proportioned and Bathtub (
B) The inconvenience of a significant drop in the water temperature inside is eliminated, and the accuracy of heat retention is improved.

Even if the set temperature (to) 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 hot water supply is housed in the vessel (K) separately from the heat exchanger (1). , hot water heated to the set temperature (to) by the heat exchanger (11) by the hot water filling operation is transferred to the bathtub (B) via the hot water filling circuit (12).
When the amount of hot water filled reaches a predetermined value, the hot water filling operation is automatically stopped.

Therefore, in this embodiment, a water filling circuit (12) is provided with a water filling valve (13), and a water level detector (21) for detecting the water level in the bathtub (8) is inserted into 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 (14) provided in the heat exchanger (11) is opened and closed to maintain the set temperature (to). A gas valve (1
5) is opened to put this burner into a combustion state, and the amount of combustion gas is set to a predetermined value by the gas valve (15). Thereafter, the output signal from the water level detector (21) is monitored by the control device (C), and when this output value reaches the set value, the water filling valve (13) is activated based on the output from the control device (C). and the gas valve (15) is closed.

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

It is input to a control device (C) that includes a hot water temperature setting device (5) and an arithmetic circuit (6).

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.

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 CB) 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 depletion 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).

In this embodiment, the following calculation is performed in the arithmetic circuit (6) using this inlet water temperature (tl) and the set temperature (to), and the standby time (T) is set as a function of the set temperature (to).

T = 75 minutes - (t0/N) minutes... ■However, N = 1 When the time set by definition has elapsed, the pump (P)
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 (1c) is determined by a comparison calculation circuit different from the calculation circuit (6) to the set temperature (t
From o), it is determined whether the temperature is lower by a certain degree (1°C) (higher or lower than the allowable temperature TL), and the detected temperature <
If tc> is 1°C lower than the set temperature (to), the gas valve (17) is opened while the pump (P) continues to operate, the burner (1δ) burns, and the bathtub ( B
) is circulated and heated by the heat exchanger (1) for reheating. When the detected temperature (1c) reaches the set temperature (to) due to 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, it enters the next standby state.

In addition, after the waiting time (T) has elapsed, the detected temperature (tc)
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-t).

In addition, in the above example, the constant "75" and rN of formula (■)
: IJ is determined by experiment, and when this constant is adopted, when the temperature is measured after the waiting time (T) has elapsed, the detected temperature (tc) will be (t.

In most cases, the drop was slightly lower than -1).

In the above embodiment, the set temperature (to
) A hot water filling method using a heat exchanger (11) is adopted to store hot water in the bathtub (Ill). The hot water in the bathtub (B) is heated to the set temperature (t) by circulating heating according to (1).
The present invention can also be applied to a bath device that heats the bath to the extent of o).

Roughly speaking, 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 in the bathtub (B) is refilled by the heat exchanger (1). Sometimes it is reheated by firing, but in this case, a new waiting time (T) is set, and the previously set waiting time (T) is canceled. Note that when the former filling of hot water is resumed, the current incoming water temperature (l) is also updated, and the waiting time (T) is set based on this updated incoming water temperature (tl).

◎Other control methods 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 in ■ in FIG. 3) as shown in FIG. 4.

In the control shown in the figure, the detected temperature (1c
) is lower than (to-1), reheating is started and the same operation as in the above embodiment proceeds, but when the detected temperature (tc) is higher than (tO-1), The detected temperature (1c) is constantly monitored while the pump (P) continues to operate, and this detected temperature (1C) reaches (t.

-1) The reheating operation will proceed as soon as the temperature becomes lower than -1). Therefore, in a device that adopts this configuration, the waiting time (T) is repeated multiple times to cause i! (
a) The inconvenience of an excessive drop in internal temperature 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 other constants may be used depending on the capabilities of the instrument. Furthermore, the standby time (T) may be calculated based on the outside air temperature instead of the inlet water temperature (tI).

[Brief explanation of drawings]

341 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 of a control program used therein, and FIG. 4 is an explanatory diagram of main parts of another modification. , FIG. 5 is an explanatory diagram of a conventional example. B)... 1)... T)... P)... 2)... 5)... 6)... Bathtub heat exchanger standby time Pump circulation circuit Hot water temperature setting device calculation circuit

Claims (1)

[Claims] This is a type of bathtub 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 the temperature set by the hot water temperature setting device (5) or After storing a set amount of hot water at the set temperature, after the waiting time (T) has elapsed, the hot water in the bathtub (B) is forced to circulate through the circulation circuit (2) equipped with a pump (P), and the hot water in the bathtub (B) is heated. The temperature of the water in the bathtub (B) is measured, and the inside of the bathtub (B) is reheated according to this temperature measurement value, and thereafter, this temperature measurement operation and reheating according to the temperature measurement value are performed at the waiting time interval. In the heat retention device, the standby time (T
) is provided, and this arithmetic circuit (6) is provided.
) sets the waiting 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 waiting time (T) is set short. ) is set to a longer time, and the temperature measurement operation and the reheating operation are advanced according to the output from the arithmetic circuit (6).