JP2000065425A - Method of detecting clogging of filter and filter clogging detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect the clogging condition of a filter by a simple method. SOLUTION: In a bath reheating device, which possesses a circuit 3a for reheating and circulation which circulates hot water between a bathtub 8 and a heater 33 for reheating and leads to the interior of the bathtub 8 through a discharge port 1a and a suction port 1b juxtaposed at the constituent wall of the bathtub 8 and a filter 1c which covers the suction port 1b so as to filtrate the return hot water flowing in the circuit 3a for reheating and circulation from the suction port by circulation, it is judged that the filter 1c is clogging when the rate of rise P per unit time of the temperature of the return hot water reaches a specified value P1 or over in the return path 32 from the suction port 1b of the circuit 3a for reheating and circulation to the heater 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting clogging of a filter, and more particularly to a method for detecting clogging of a filter provided on a suction port for additional heating provided in a bathtub. It is. The present invention also relates to a filter clogging detection device, and more particularly to a filter clogging detection device for detecting the clogging state.

[0002]

2. Description of the Related Art FIG. 8 is a diagram showing an outline of the configuration of a conventional bath reheating apparatus. The conventional bath reheating device shown in the figure is provided with a reheating circuit (9a) for circulating hot water between the bathtub (8) and the heat exchanger (90a). The firing circulation circuit (9a) communicates with the inside of the bathtub (8) through a discharge port (93) and a suction port (94) juxtaposed on the constituent walls of the bathtub (8).

The reheating circuit (9a) is provided with a pump (97) for forcibly circulating hot water, and the heat exchanger (90a) is heated by a gas burner (99). It has a configuration. Therefore, the hot water in the bathtub (8) is sucked into the return path (92) of the reheating circuit (9a) through the suction port (94), and is heated by the heat exchanger (90a). Circuit (9a)
Is discharged into the bathtub (8) from the outward path (91) through the discharge port (93).

At this time, the hot water discharged from the discharge port (93) flows in the bathtub (8) as indicated by an arrow (F ₁ ) in FIG.
(8) The hot water sucked into the suction port (94) from inside is indicated by the arrow (F
_{Since the} hot water flows as in ₂ ), the hot water circulates greatly in the bathtub (8) (hereinafter referred to as "normal circulation"). In this state, hot water discharged from the discharge port (93)
(8) The temperature of the hot water in the bathtub (8) is raised as a whole while being mixed with the hot water in the inner bath.

[0005] The bath reheating apparatus has a bathtub.
(8) The temperature of the return hot water flowing into the return path (92) from inside
The temperature sensor (96) detected by
And an automatic end function for terminating the additional heating operation when the temperature of the return hot water detected in 6) reaches the additional heating set temperature. The suction port (94) is covered with a filter (95) for filtering hot water returning from the inside of the bathtub (8) to the return path (92). Waste does not enter the return route (92).

[0006]

However, in this bath reheating apparatus, if the amount of waste collected in the filter (95) increases as the period of use increases, the suction port (94)
The amount of hot water suctioned from the reheating circuit to the reheating circuit (9a) decreases, and the amount of hot water circulated in the reheating circuit (9a) decreases. 8) The amount of hot water discharged into the interior is reduced. Therefore, the hot water discharged from the discharge port (93), the suction port in the bathtub (8) as in the arrow in FIG (F ₃₎
(94) is short-circuited (hereinafter, this is referred to as "short-circuit circulation").

In this short-circuit circulation state, the bathtub (8)
The temperature of the return hot water in the return path (92) sharply rises while the temperature of the hot water in the inside is hardly raised, and the reheating operation ends by the automatic end function. On the other hand, in those without the automatic end function, when the short-circuit circulation state occurs, the bathtub (8)
The internal water will not be heated sufficiently.

A first object of the present invention is to make it possible to reliably detect a clogged state of a filter by a simple method. A second object of the present invention is to make it possible to reliably detect a clogged state of a filter with a simple device. [1]

[0009]

Means for Solving the Problems The solution of the present invention, which has been made to solve the above-mentioned first problem, is as follows: "circulating hot water between a bathtub and a heating unit for additional heating; A circuit for additional heating circulation communicating with the inside of the bathtub at a discharge port and a suction port arranged side by side on the component wall, and the return water flowing into the circuit for additional heating circulation from the suction port by the circulation so as to be filtered. In a bath reheating device having a filter covered by a suction port, a rate of rise of the temperature of the return hot water per unit time in a return path from the suction port to the heating unit of the reheating circuit is predetermined. It is determined that the filter is in a clogged state when the value exceeds the value. "

[0010] In this case, when the amount of collected dirt by the filter increases, the hot water discharged from the discharge port flows into the suction port in a short-circuited state, and the return hot water in the return path is short-circuited. The rate of increase in temperature per unit time is greater than the rate of increase in the normal circulation state. And
As the trapping amount increases, the rate of increase gradually increases and reaches a predetermined value or more.

At this time, if the predetermined value is set to a value corresponding to the clogged state of the filter, it is determined that the filter is in the clogged state when the rising rate reaches the predetermined value or more. It was done. In addition, as long as the circuit for circulating hot water with the bathtub is used as the circuit for additional heating circulation, a circuit for forcibly circulating hot water and a circuit for circulating using the natural convection action of hot water are included. The heating unit includes a heat exchanger, a heater, and the like.

[0012]

According to the present invention, as described above, the clogged state of the filter can be detected when the rate of increase in the temperature of the return hot water per unit time has exceeded a predetermined value. It will be possible to reliably detect by a simple method. [2] The method according to [1], wherein the "predetermined value is a reheating heat amount per unit time in the heating unit, and the discharge port and the suction port are submerged in the bathtub. Is the value obtained by dividing by the minimum possible hot water storage amount ”.

[0013] In this case, the predetermined value means the rate of rise of the temperature of the hot water in the bathtub when all of the heating amount in the heating section is applied to the hot water having the minimum hot water storage amount in the bathtub. When the amount of hot water in the bathtub is equal to or more than the minimum hot water storage amount, the rate of increase in the temperature of the hot water in the bathtub, that is, the rate of increase in the temperature of the return hot water in the normal circulation, is smaller than the predetermined value. Therefore, the filter has a degree of clogging that is equal to or greater than a predetermined value in a state where the rate of increase in the temperature of the return hot water has reached the predetermined value.

[0014] In this apparatus, when corresponding to bathtubs of various specifications and circuits for reheating circulation, since the amount of heating for reheating and the minimum amount of hot water storage can be easily determined, the predetermined value can be easily obtained from these. it can. [Claim 3] The solution of the present invention taken to solve the second problem described above is as follows: "The hot water is circulated between the bathtub and the heating unit for reheating, and the juxtaposition is made on the constituent wall of the bathtub. A circuit for reheating and recirculation communicating with the bath at the discharge port and the suction port, and the suction port is covered by the recirculation so as to filter return hot water flowing from the suction port to the circuit for reheating and recirculation by the circulation. Temperature detection means for detecting the temperature of the return hot water on the return path from the suction port of the circuit for reheating the reheating circuit to the heating section, which is used in a bath reheating device having a filter and a reheating device. Detecting means for detecting a rate of increase in the temperature of the return hot water per unit time based on the temperature, and determining that the filter is in a clogged state when the detected rate of increase reaches a predetermined value or more. And means ”.

[0015] In this case, the temperature of the return hot water on the return path is detected by temperature detecting means, and based on the detected temperature, the rate of rise of the return hot water temperature per unit time is detected by the detecting means. Is done. Then, when the amount of collected dirt by the filter is increased and a short-circuit state is established, the rate of increase becomes larger than that in a normal circulation state. Then, as the trapping amount increases, the rate of increase gradually increases and reaches a predetermined value or more.

At this time, if the predetermined value is set to a value corresponding to the clogged state of the filter, when the rate of increase reaches the predetermined value or more, the judging means sets the filter in a clogged state. It is determined that there is. In this one,
Since the clogging state of the filter can be detected when the rate of rise of the temperature of the return hot water per unit time has reached a predetermined value or more, the clogging state can be reliably detected by a simple device.

[Item 4] In the above item 3, "the bath reheating device has a function of activating a means for coping with the clogging of the filter in response to the judgment output of the judgment means." In this case, means for coping with filter clogging is activated in response to the judgment output of the judgment means.

"Activating means for dealing with clogging" means, for example, activating a buzzer or an LED, thereby notifying a user of the necessity of cleaning the filter or catching the filter. Includes one that activates the removal device that removes collected dirt, and one that activates the function of changing the additional heating operation mode to increase the forced circulation flow rate of hot water in the additional heating circulation circuit.

In this case, as described above, when the filter is clogged, it is determined that the filter is clogged, and the means for dealing with the filter clogging is activated. When the firing operation falls into an incomplete state, the incomplete state can be prevented from continuing. [5] In the above-mentioned item 4, "the bath reheating device is
A function of terminating the reheating operation in the reheating circuit and the heating unit in response to the temperature of the return hot water detected by the temperature detecting means reaching the reheating set temperature ”. In the state where the temperature of the hot water in the entire bathtub does not reach the reheating setting temperature, the short-circuiting continues, and the incomplete state in which the temperature of the return hot water reaches the reheating setting temperature and the reheating operation ends is continued. You can prevent it.

[6] In the above item 4 or 5, "the means for coping with the clogging of the filter is an alarm."
In this case, when the determination means determines that the filter is in the clogged state, the alarm is activated in response to the determination output, so that the user can know that the filter is in the clogged state. Then, when the user cleans or replaces the filter, the clogged state of the filter is eliminated.

In this case, when it is necessary to clean or replace the filter, the fact is automatically notified, so that the user can easily understand the necessity.
In the above item 4 or 5, besides this item 6, a means for dealing with clogging of the filter is a washing device for washing the filter.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a configuration of a bath reheating device in an embodiment of the present invention, and FIG. 2 is an assembled perspective view of a circulation base (1) of the bath reheating device of FIG. . As shown in FIG. 1, this bath reheating device comprises a reheating circuit (3a) for recirculating hot water between the bathtub (8) and the heat exchanger (33) in the appliance body (100). The reheating circuit (3a) is provided on the side wall of the bathtub (8).
The circulation mouthpiece (1) mounted on the (81) communicates with the inside of the bathtub (8) through the discharge port (1a) and the suction port (1b) adjacent to each other.

In addition, the discharge port (1a) is a circuit for additional heating circulation (3a).
At the most downstream end of the outward path (31) from the heat exchanger (33) to the bathtub (8), and the suction port (1b) is a bathtub (8) in the circuit for reheating circulation (3a). It is at the most upstream end of the return path (32) from inside to the heat exchanger (33). [About the instrument body (100)] Return path described above
As shown in FIG. 1, a pump (37) for forcibly circulating hot water through the return path (32) and the outward path (31) is provided in a pipe downstream of the circulation base (1) in (32). Provided. The heat exchanger (33) is configured to be heated by the gas burner (34).

A water flow switch (36) for detecting the presence or absence of a circulating flow of hot water is provided in a pipe downstream of the circulation mouthpiece (1) in the return path (32). And a temperature sensor (4) for detecting the temperature of the return hot water flowing into the return path (32). Further, the appliance body (100) is provided with a hot water supply circuit (2a) for hot water supply, and the hot water supply circuit (2a) has a heat exchanger (23) for hot water supply heated by a gas burner (24). )
Is provided. By the hot water supply circuit (2a), hot water heated by the heat exchanger (23) is supplied to the curan in the bathroom.

Further, between the hot water supply circuit (2a) and the above-mentioned additional heating circulation circuit (3a), the hot water heated by the heat exchanger (23) is passed through the additional heating circulation circuit (3a). A hot water supply circuit (25) for supplying the hot water into the bathtub (8) is provided. [Circulation Base (1)] As shown in FIG. 2, the circulation base (1) includes a base body (10) having a discharge port (1a) and a suction port (1b), and the base body (10). The filter (1c) that can be put on the suction port (1b) of the
And a cover body (12) detachably attached to the base body (10) so as to be sandwiched between the base body (10) and the base body (10).

As shown in FIG. 2, the base body (10) has a hollow disk-shaped first portion (10a), and projects from one surface of the first portion (10a) and communicates with the first portion (10a). Cylindrical second
(10b) and the first part as shown in FIG.
(10a) comes into contact with the side wall (81) of the bathtub (8) from the inside, and the second portion (10b) penetrates the side wall (81) and projects outside.

Then, as shown in FIG. 2, the second portion (10
The pipe constituting the return path (32) is connected to the outer end of b), and a plurality of openings are formed in the front plate (101) of the first portion (10a). Therefore, the opening forms the above-mentioned suction port (1b), and the first part (10a) and the second part (10b) form part of the return path (32).
Further, inside the first portion (10a) and the second portion (10b), there is provided a supply pipe (11) which is inserted across the two and is connected to a pipe constituting the outward path (31). And the downstream end thereof opens downward through the peripheral wall (102) of the first portion (10a). Therefore, the downstream end of the supply pipe (11) forms the above-described discharge port (1a), and the supply pipe (11) forms a part of the outward path (31).

The above-mentioned filter (1c) is for filtering hot water returning from the bathtub (8) to the return path (32) and collecting hair and other dirt from the hot water. As shown,
It is formed in a disk shape large enough to cover all the suction ports (1b) group of the front plate (101). Further, the cover body (12) is provided with a first part.
(10a) is formed in a circular dish shape that covers from the front side, and the cover (12) communicates the discharge port (1a) into the bathtub (8) when attached to the first part (10a). Notch (12a)
And a plurality of openings (12b) for allowing the suction port (1b) to communicate with the inside of the bathtub (8) in the mounted state.

[Remote control unit (6)] As shown in FIG. 1, this bath reheating unit has a remote control unit installed in the bathroom and for operating the appliance body (100).
The remote control unit (6) includes a reheating switch (61), an automatic reheating switch (62), and a reset switch (62) for instructing a user to start a reheating operation and the like. 64) and so on. The remote control unit (6) is provided with a clogging lamp (63) composed of an LED.

[Reheating Control Circuit (5)] Further, the above-mentioned appliance body (100) is provided with a reheating control circuit (5) for controlling the reheating operation. The reheating control circuit (5) includes a microcomputer, and the reheating operation is performed in accordance with a reheating control program stored in the microcomputer.

[Reheating Operation] FIG. 3 is a flowchart showing a reheating control program of the reheating device of FIG. 1, FIG. 4 is a flowchart showing a temperature monitoring routine of FIG. 3, and FIG. 4 is a flowchart showing an auxiliary hot water filling routine of FIG. 3. Hereinafter, the reheating operation will be described with reference to these flowcharts.

In this case, as shown in the flowchart of FIG. 3, the additional heating switch (61) of the remote control unit (6) is used.
Is turned on, the gas burner is activated after the pump (37) is activated.
(34) is ignited to start gas combustion (step (S1
1) (S12) (S15)). In this state, as shown in FIG.
Bathtub hot water in the (8), the suction port as in the arrow in FIG (M ₂₎ (1b)
After being drawn into the return path (32) and heated by the heat exchanger (33), the bathtub (8) passes through the discharge port (1a) from the outward path (31).
It is assumed that flow as it is discharged within the arrow in FIG. (M _1), the hot water in the bathtub (8) is a state of normal circulation described above.

Accordingly, the high-temperature (for example, about 80 ° C.) hot water discharged from the discharge port (1a) is mixed with the hot water in the bathtub (8), and the hot water in the bathtub (8) is entirely heated. Will be.
As the temperature rises, the temperature of the return hot water from the bathtub (8) to the return path (32) also increases, and the temperature of the return hot water is detected by the temperature sensor (4). On the other hand, as shown in the flowchart of FIG. 3, in the gas combustion state, a temperature monitoring routine (step (S19)) for monitoring the temperature of the return hot water is executed.

Prior to this, the first timer for measuring the time from the start of combustion and the second timer for measuring the time every minute from the start of combustion are turned on (step (S16)). . The initial value of the rate of rise (P) per unit time of the temperature of the return hot water is set to “0”, and the first temperature data (T ₁ ) used for calculating the rate of rise (P) every minute from the start of combustion. Is set as the detected temperature (T) of the temperature sensor (4) at the start of combustion (steps (S17) and (S18)).

In the temperature monitoring routine, as shown in the flow chart of FIG.
(T) is the reheating setting temperature (T ₀ ) (for example, 38 ° C. to 42 ° C.)
It is repeatedly executed until it becomes (Step (S49)).
In this temperature monitoring routine, the rate of increase (P) is calculated every minute from the start of combustion based on the detected temperature (T). Specifically, when one minute has elapsed from the start of combustion, if that is determined in step (S42), the second temperature data (1) indicating the temperature of the return hot water one minute earlier than this point in time is determined. the first to T ₂₎ 1
Enter the value of the temperature data (T ₁ ) (step (S43)), and
At this point, the first temperature data (T
₁ ) Enter the value of the detected temperature (T) at this time (step
(S44)). Subsequently, the second temperature data (T ₂ ) is subtracted from the first temperature data (T ₁ ) to calculate a rise rate (P) at this time (step (S45)).

Then, these steps (S43) (S44) (S45)
After that, the second timer is reset, and the time measurement is restarted from "0", and the steps (S43), (S44), and (S45) are executed when one minute has elapsed. In this way, in steps (S42) to (S46), the rate of rise (P) of the temperature of the return hot water is detected every minute based on the detected temperature (T).

[0037] In this construction, when the use period of the filter placed over the above-mentioned suction port (1b) (1c) is longer, the filter eye (1c) clogging progresses the arrows in FIG. 1 (M ₃₎ The above-mentioned rate of rise (P)
Will be significantly larger. Then, the rate of increase (P) is
If (P ₁ ) or more is reached, this is determined in step (S47).

Therefore, by setting the predetermined value (P ₁ ) to a value corresponding to the clogged state of the filter (1c), it is determined in this step (S47) that the clogged state is present. Become. In this case, the predetermined value (P ₁ )
The amount of additional heating per unit time at (33) is the minimum amount of hot water that can be re-fired when the discharge port (1a) and the suction port (1b) are submerged in the bathtub (8) (two-dot chain line in Fig. 1). Divided by the amount of hot water stored in the table).

This predetermined value (P ₁ ) is determined by the amount of hot water in the bathtub (8) when the entire amount of heating in the heat exchanger (33) is applied to the minimum amount of hot water in the bathtub (8). Means the rate of temperature rise of the bathtub (8).
(8) The rate of rise of the temperature of the hot water in the inside, that is, the rate of rise of the temperature of the return hot water in the normal circulation becomes smaller than a predetermined value (P ₁ ).

Accordingly, the filter (1c) is in a clogged state when the rising rate (P) has reached the predetermined value (P ₁ ) or more. When it is determined in the flowchart of FIG. 4 that the rate of rise (P) has reached a predetermined value (P ₁ ) or more, the clogging lamp
(63) is turned on (step (S50)), whereby
The user knows that the device is in the clogged state. When the user cleans or replaces the filter (1c), clogging of the filter (1c) is eliminated.

In this embodiment, the temperature monitoring routine is performed as shown in FIG.
As shown in the flowchart, the detected temperature (T)
Set temperature (T₀) Is reached (step (S49)), and FIG.
Returning to the step (S21) shown in the flowchart of
The gas combustion in the furnace (34) ends. In addition, the clogged state
If the reheating operation is performed as it is,
Although the hot water in the bathtub (8) is not
Degree (T) is the reheating setting temperature (T ₀) And the temperature reheating operation
It will end. However, in this case, FIG.
Depending on the step (S48) in the flow chart,
Until 3 minutes have passed, regardless of the detected temperature (T)
Gas combustion is continued. Therefore,
Minimum reheating (3 minutes) even in clogged condition
It is.

In this embodiment, when the combustion is completed, the first timer and the second timer are turned off (step (S22)) as shown in the flowchart of FIG.
After waiting for seconds, the pump (37) is turned off (step (S2
3) (S24)). By the pump operation for 5 seconds, overheating (so-called post-boiling) of the hot water in the additional heating circulation circuit (3a) immediately after the end of combustion is prevented.

In this case, when the amount of hot water stored in the bathtub (8) is not enough for the minimum amount of hot water and the suction port (1b) is not submerged, the additional heating switch (61) is turned on. When the pump (37) is activated and hot water does not flow in the circuit for reheating circulation (3a), in this case, the step (S
13) As in (S14), it is determined that the water flow switch (36) is not turned on, and the auxiliary hot water filling routine is executed.

In this auxiliary filling routine, as shown in the flow chart of FIG. 5, once the pump (37) is turned off, the operation of 6-liter filling is executed (step (S)).
31) (S32)). In this operation, the hot water supply circuit shown in FIG.
The water valve (26) provided in (25) is opened and the hot water supply circuit
Until the flow counter (not shown) provided in (25) reaches 6 liters, the hot water in the hot water supply circuit (2a) is filled with hot water.
5), water is supplied into the bathtub (8) through the outbound route (31) and the return route (32).

Then, as shown in the flow chart of FIG. 5, the pump (37) is turned on again after this 6-liter filling (step (S33)). At this time, if the suction port (1b) is submerged, When the water flow switch (36) is turned on and the determination in step (S34) is completed, the auxiliary filling process is terminated, and the process proceeds to step (S15) in FIG. If the suction port (1b) has not yet submerged after the 6 liter hot water filling, the water flow switch (36) is not turned on and the step (S) is performed.
By the judgment in 34), the buzzer (not shown) provided in the remote control unit (6) is turned on to notify the user that reheating is impossible. The remote control unit
When the reset switch (64) of (6) is turned on, the buzzer is turned off and the process returns to the step (S11) (steps (S35) and (S36)).

In this case, as described above, when the filter (1c) becomes clogged, the bathtub is circulated by the short circuit.
(8) The temperature of the hot water in the tank falls into an incomplete state in which the reheating operation is completed without reaching the reheating setting temperature (T ₀ ), but at this time, the temperature is monitored in step (S47) of the temperature monitoring routine. Is determined. Then, a clogging signal is output from the functional unit that executes step (S47), and the clogging lamp (63) is turned on in response to this output. Therefore, the clogging lamp (63)
When the user cleans or replaces the filter (1c), the incomplete state can be resolved.

That is, when the supplementary heating operation falls into an incomplete state due to the clogging state, the incomplete state can be prevented from continuing. In this device, the discharge port (1a) and the suction port (1b) are formed in the circulation base (1) in a state in which they are close to each other, and the short-circuit is likely to occur. This is particularly noticeable.

In this apparatus, as described above, the clogged state of the filter (1c) is detected when the rate of rise (P) of the temperature of the return hot water per unit time has reached a predetermined value (P ₁ ) or more. Therefore, the clogging state can be reliably detected by a simple method and device. The clogging signal can be used as various control signals in addition to the control of the clogging lamp (63).

In this case, the predetermined value (P ₁ ) is equal to the value of the heat exchanger (3).
The value obtained by dividing the amount of additional heating per unit time in 3) by the minimum amount of hot water that can be refired when the discharge port (1a) and suction port (1b) are submerged in the bathtub (8). Therefore, when corresponding to the bathtub (8) of various specifications and the circuit for reheating circulation (3a), the amount of reheating and the minimum amount of stored hot water can be easily determined. Therefore, the above-mentioned predetermined value (P ₁ ) can be easily obtained.

In this case, when it is necessary to clean or replace the filter (1c), the fact is automatically notified, so that the user can easily understand the necessity. [Other embodiments]. FIG. 6 is a flowchart showing a reheating control program according to another embodiment of the present invention.

In the above embodiment, when the temperature of the hot water in the bathtub (8) is lowered, the user instructs the reheating operation each time, but the hot water in the bathtub (8) is constantly turned on. It is good also as composition which performs a reheating operation automatically so that it may be maintained at the reheating setting temperature. In this case, as shown in the flowchart of FIG. 6, when the user turns on the automatic reheating switch (62) of the remote control unit (6) and instructs automatic reheating (step (S61)), the bathtub (8). When the temperature of the hot water drops and the detected temperature (T) becomes equal to the additional heating set temperature (T ₀ ) −1.5 ° C., this is determined in step (S62), and the flow chart of FIG. Steps (S12) to (S24)
Is executed. This reheats the hot water in the bathtub (8). This automatic reheating operation is repeatedly performed every time the detected temperature (T) drops to the reheating setting temperature (T ₀ ) −1.5 ° C. until the user turns off the automatic reheating switch (62). (Steps (S63) and (S62)).

The automatic reheating operation may be terminated when a predetermined time (for example, 4 hours) has elapsed from the start. . FIG. 7 is an explanatory view of a bath reheating apparatus according to still another embodiment of the present invention. In the above embodiment, the discharge port (1a) and the suction port (1b)
Although formed in the circulation base (1) in a state of being close to each other, as long as they are juxtaposed in the bathtub (8), for example, as shown in FIG. It may be configured to be vertically separated. Further, as shown in the figure, the discharge port (1a) may be arranged above the suction port (1b).

[0053] In the above embodiment, the detected temperature (T)
Has an automatic end function for terminating the reheating operation when the reheating temperature reaches the reheating set temperature (T ₀ ).
(8) It is possible to prevent the incomplete state in which the temperature of the hot water inside is not sufficiently raised from continuing. . In the above embodiment, when it is determined that the filter (1c) is in a clogged state, the clogging lamp (63) made of an LED is configured to be turned on. In addition to (63), a character or the like may be displayed or a buzzer or a chime may sound.

[0054] In the above embodiment, the filter (1
c) was determined to be in a clogged state and the clogging lamp (63) as an alarm was turned on.However, in order to deal with this clogging, in addition to this alarm, for example, In response to the output of the determination, a removing device for removing dirt collected by the filter (1c) may be activated.

The removing device may be a cleaning device for cleaning the filter (1c). As the cleaning device, for example, as shown by a two-dot chain line in (100) of FIG.
A cleaning device (7) that is connected to the water and that sprays water from the back side to (1c) through the return path (32) may be employed. Further, as means for coping with the clogging, a function unit provided in the reheating control circuit (5) and changing the reheating operation mode in response to the determination output may be used. As a device for changing the additional heating operation mode, for example, a device for increasing the forced circulation flow rate of hot water in the additional heating circulation circuit may be employed.

[0056] In the above embodiment, the predetermined value (P ₁ )
Is a value calculated from the above-described amount of additional heating in the heat exchanger (33) per unit time and the minimum amount of hot water that can be additionally heated in the bathtub (8). ₁ ) may be a value empirically obtained by a test or the like. . In the above embodiment, the reheating circuit (3a)
Although the hot water is forcibly circulated to and from the bathtub (8), the hot water may be circulated using the natural convection of the hot water.

The heating unit for heating the hot water in the additional heating circulation circuit (3a) may be a heater or the like in addition to the heat exchanger (33). . In the above embodiment, the temperature sensor (4) is
Although provided in the pipeline downstream of the circulation base (1) in (2), as long as the temperature of the return hot water is detected in the return path (32), for example, the base body of the circulation base (1) It may be provided inside (10) and outside the supply pipe (11).

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a configuration of a bath reheating apparatus in an embodiment of the present invention.

FIG. 2 is an assembled perspective view of a circulation base (1) of the bath reheating apparatus of FIG. 1;

FIG. 3 is a flowchart showing a reheating control program of the reheating device of FIG. 1;

FIG. 4 is a flowchart showing a temperature monitoring routine of FIG. 3;

FIG. 5 is a flowchart showing an auxiliary hot water filling routine of FIG. 3;

FIG. 6 is a flowchart showing a reheating control program according to another embodiment of the present invention;

FIG. 7 is an explanatory view of a bath reheating apparatus according to still another embodiment of the present invention.

FIG. 8 is a diagram showing an outline of a configuration of a conventional bath reheating apparatus.

[Explanation of symbols]

 (100) ・ ・ ・ Main unit (1) ・ ・ ・ Circulation base (3a) ・ ・ ・ Circulation circuit for reheating (31) ・ ・ ・ Outbound (32) ・ ・ ・ Return (1a) ・ ・ ・ Discharge port ( 1b) ・ ・ ・ Suction port (1c) ・ ・ ・ Filter (4) ・ ・ ・ Temperature sensor (5) ・ ・ ・ Reheating control circuit

Claims (6)

[Claims] A circuit for circulating hot water between a bathtub and a heating unit for additional heating, and a circuit for additional heating circulation communicating with the inside of the bathtub at a discharge port and a suction port arranged side by side on a constituent wall of the bathtub; And a filter placed on the suction port so as to filter the return hot water flowing into the circuit for reheating circulation from the suction port by the circulation. A filter clogging detection method for determining that the filter is in a clogged state when a rate of rise of the temperature of the return hot water per unit time on a return path from a suction port to the heating unit reaches a predetermined value or more. 2. The predetermined value is a reheating amount of reheating in the heating unit per unit time, which is a minimum amount of hot water that can be refired when the discharge port and the suction port are submerged in the bathtub. The method for detecting filter clogging according to claim 1, which is a value obtained by dividing the value. 3. A circuit for recirculating hot water which circulates hot water between the bathtub and a heating unit for reheating and communicates with the inside of the bathtub at a discharge port and a suction port juxtaposed on a constituent wall of the bathtub. Used in a bath reheating device comprising a filter covered on the suction port so as to filter return hot water flowing from the suction port into the reheating circuit by the circulation, and the reheating circuit. Temperature detection means for detecting the temperature of the return hot water on the return path from the suction port to the heating section, and detection for detecting a rate of increase in the temperature of the return hot water per unit time based on the detected temperature. A filter clogging detection device comprising: means; and determination means for determining that the filter is in a clogged state when the detected rate of rise reaches or exceeds a predetermined value. 4. The filter clogging detection device according to claim 3, wherein the bath reheating device has a function of activating a unit for coping with the filter clogging in response to a judgment output of the judgment unit. . 5. The additional reheating circuit in the additional recirculation circuit and the heating unit in response to the temperature of the return hot water detected by the temperature detecting means reaching a reheating set temperature. The filter clogging detection device according to claim 4, which has a function of terminating the reheating operation. 6. The filter clogging detecting device according to claim 4, wherein the means for coping with the filter clogging is an alarm.