JP3632199B2 - Bath water level detection method and apparatus, circulating flow rate control device, and bath water heater control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water level detection method and apparatus for a bathtub capable of, for example, dropping, chasing, and bubble operation, and a control device for a circulation flow rate control device and a bath water heater.
[0002]
[Prior art]
In recent years, various types of bath water heaters have been developed that can automatically perform air purge and bubble operation of bath piping after the completion of bath operations such as dropping, chasing and chasing.
In such a bath water heater, a hot water supply side heat exchanger and a bath side heat exchanger are housed in a can and heated by a combustion device, and a circulation circuit is configured between the bathtub side and the bath side heat exchanger. The circulation circuit is provided with a pump, a flow rate adjusting valve for adjusting the amount of circulating water, and a water level sensor for detecting the water level in the bathtub, and a signal of the water level sensor is input and the flow rate adjusting valve It is provided with a control means for controlling the opening degree. Moreover, the bypass circuit which has a valve is provided in the circulation circuit so that a bubble can be generated by bypassing the bath-side heat exchanger.
[0003]
For example, when the bath water heater performs dropping or chasing, for example, it first performs a circulation determination. The circulation determination is performed when a predetermined amount of water in the bathtub is circulated in the bathtub through a circulation circuit with a pump and the presence or absence of water in the bathtub is determined. Moreover, when adding the amount of hot water after circulation determination, it is necessary to detect the water level in the bathtub. Therefore, in order to automate the operation of the bath water heater, it is important to enable normal circulation determination and water level detection.
[0004]
[Problems to be solved by the invention]
The conditions for installing the bathtub and bath water heater are not necessarily the same. That is, there is an error in the accuracy of the opening of the flow control valve, there is a difference in pipe resistance caused by construction conditions and construction conditions such as the length and height difference of a series of pipes such as a circulation circuit, etc. There are effects due to various external factors (hereinafter referred to as construction conditions, etc.) such as accuracy errors. However, in the past, despite the influence of such construction conditions, the circulation flow rate at the time of circulation determination is only a single position of the flow rate adjustment valve, so only a predetermined amount of water is constantly circulated. there were.
[0005]
Therefore, for example, if the pipe resistance is increased because the pipe is long or the capacity of the pump is weak, a sufficient amount of water does not circulate at the time of the circulation judgment, and thus there is a possibility that a reliable judgment cannot be made. Conversely, if the amount of circulation is large, air may be sucked into the circulation pipe.
[0006]
In addition, when the inside of the bathtub is empty or when the water surface is below the circulation fitting and the pump cannot suck the water in the bathtub (below the draft position), the water remaining in the piping of the circulation circuit is Since the metal is vigorously discharged onto the peripheral wall surface of the bathtub, there is a problem that the water is reflected upward and wets the laundry that has been dried above the bathtub, for example.
[0007]
In addition, if air is sucked into the pipe at the time of circulation determination, the air remains in the vicinity of the water level sensor or in the pump. After the circulation is determined, the valve is closed and the water level in the bathtub is detected by a water level sensor (a sensor that detects water pressure). However, if air remains between the bathtub and the closed valve, a water level detection failure will occur. There was a drawback to invite.
[0008]
The present invention has been made in view of the above-mentioned conventional drawbacks, and when circulating water in the bathtub to the circulation pipe as in circulation determination, the water amount according to the construction conditions of each bath water heater is circulated. In addition, an object of the present invention is to prevent water level detection failure by removing air that affects water level detection.
[0009]
[Means for Solving the Problems]
The present invention has been made as a water level detection method in a bathtub and a device for the same, and a control device for a circulating flow rate control device and a bath water heater to solve the above-mentioned problems. The water is heated by the combustion device, constitutes a circulation circuit for circulating the water in the bathtub, and the air between the bathtub and the valve is provided via a valve provided downstream and above the water level sensor. Is that the water level in the bathtub is detected by a water level sensor.
[0010]
In this method, even if air may remain between the bathtub and the valve, the water level is detected after the air has escaped to the top through the valve. Detection is possible.
[0011]
The characteristic of the water level detection device in the bathtub is that the circulation circuit for circulating the water in the bathtub is provided with a pump, a water level sensor for detecting the water level in the bathtub, and a valve, and the valve is closed. In the water level detection device in the bathtub that detects the water level in the bathtub based on a signal from the water level sensor, the valve is provided in a pipe portion that is downstream of the water level sensor and in which the air in the pipe can move upward. And a control means for closing the valve so as to block the pipe line downstream of the water level sensor from the bathtub after a predetermined time has elapsed from the stop of the pump so that the air between the bathtub and the valve escapes above the valve. It is in having been established.
[0012]
Such an apparatus can easily carry out the above-described method, and can easily achieve automatic detection of the water level in the bathtub when there is no air remaining in the piping.
[0013]
The circulation flow control device is characterized in that a circulation circuit for circulating water in the bathtub is provided with a pump and a flow rate adjustment valve for adjusting the amount of circulating water, and in order to circulate a predetermined amount of circulating water, In the circulating flow control device provided with the control means for controlling the opening degree of the flow rate adjustment valve, the control means is prepared in advance so that a plurality of positions having different opening degrees of the flow rate adjustment valve can be selected, The flow control valve is controlled to the opening degree of the selected position.
[0014]
Therefore, since the position of the flow rate adjustment valve can be selected at the time of construction, the circulation flow rate can be adjusted in consideration of the influence of construction conditions, etc., and the circulation judgment that circulates the predetermined circulating water according to each construction condition can be performed reliably. The
[0015]
In addition, the circulation circuit for circulating the water in the bathtub is provided with a pump and a flow rate adjusting valve for adjusting the amount of circulating water, and the opening of the flow rate adjusting valve is adjusted to circulate a predetermined amount of circulating water. In the circulation flow rate control device provided with the control means for controlling, the control means performs circulation determination mode performed when the water level in the bathtub is above the draft position, and circulation performed when the water level is below the draft position. The position of the circulation determination preliminary circulation mode is set so that the circulation flow rate is smaller than the position of the circulation determination mode.
In addition, a draft position means the water surface position which judges whether a pump can attract | suck the water in a bathtub from the circulation metal fittings provided in the bathtub for circulation determination etc.
[0016]
By providing the circulation judgment mode and the circulation preliminary judgment mode, appropriate circulation judgment is possible according to the water level, and the water in the bathtub is below the draft and water remains in the piping of the circulation circuit Even so, the flow adjustment valve is set at a predetermined position, so that the water in the pipe is not discharged from the circulation fitting of the bathtub vigorously, and the discharged water comes into contact with the peripheral wall surface of the bathtub. Thus, it is possible to prevent reflection upward.
[0017]
In addition, a feature of the bath water heater as a control device is that the bath-side heat exchanger is heated by the combustion device to constitute a circulation circuit for circulating water in the bathtub, and the circulation circuit The bath-side water inlet pipe connected to the entrance side of the exchanger, the return pipe connected to the bathtub side, the bath-side hot water pipe connected to the outlet side of the bath-side heat exchanger, and the outlet connected to the bathtub side One of the pipes is branched from the connection point between the bath-side inlet pipe and the return pipe via a flow rate adjustment valve, and the other is connected to the bath-side outlet pipe and the outgoing pipe so as to bypass the bath-side heat exchanger. A bath-side bypass path connected so as to join, and a bypass path connected between the return pipe and the forward pipe, and at a position upstream of the connection portion with the bypass path in the return pipe, A water level sensor and a pump are provided to detect the water level in the bathtub. The bypass path is provided with a valve, and the valve and the flow rate adjustment valve are controlled by a control means. In the control apparatus for a bath water heater, the bypass path is provided between the bathtub and the valve. The air is configured to be movable above the valve, the valve is closed after the air has escaped above the valve, and the control means has a plurality of positions with different opening amounts of the flow rate adjusting valve in advance. The control means is configured to control the flow rate adjusting valve to the opening degree of the selected position.
[0018]
According to the control device for the bath water heater, automation of the water level detection in the bathtub in a state where there is no remaining air in the piping and the like, and the like, which easily circulates predetermined circulating water according to each construction condition, can be easily achieved. it can.
When the water level is detected, for example, when the hot water supply side performs a combustion operation, if the vibration is transmitted to the water level sensor using water in the pipe as a medium, it adversely affects the water level detection. The vibration can be cut off and the water level can be detected with high accuracy.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 and 2 show a bath water heater 1 according to an embodiment of the present invention. In FIG. 2, a hot water supply side heat exchanger 3 and a bath side heat exchanger 4 are integrally disposed in a can 2, and an oil burner as a combustion device is disposed below the heat exchangers 3 and 4. 6 and a blower fan 7 are provided, and a heat exhaust port 5 is opened on the upper surface of the can body 2.
[0020]
When the oil burner 6 opens the solenoid valve 9 provided in the oil supply path 8 and operates the electromagnetic pump 10, oil (petroleum) circulates through the oil supply path 8 and is discharged from the nozzle 11 in the form of a mist. The mist-like oil discharged from 11 is mixed with air and burned. The oil burner 6 has an ignition device 12 for igniting oil discharged from the nozzle 11 and a combustion detection sensor (frame rod) 13 for monitoring combustion. The blower fan 7 forcibly supplies air to the oil burner 6 and burns oil at an optimum air-fuel ratio.
[0021]
A hot water supply path 14 is connected to the inlet side of the hot water supply side heat exchanger 3 and a hot water supply path 15 is connected to the outlet side, thereby forming a hot water supply hot water supply. A filter 17 is connected to the inlet side of the water supply path 14, and a water amount sensor 18 and an incoming water temperature sensor 21 are respectively connected to the water supply path 14.
Reference numeral 16 denotes a hot water supply side bypass passage connected between the water supply passage 14 and the hot water supply passage 15 in order to bypass the hot water supply side heat exchanger 3. The amount of water in the hot water supply side bypass 16 is controlled by a water proportional valve 19.
[0022]
The hot water supply passage 15 is connected to a hot water mixing passage 25 through a water amount servo valve 20, and the hot water heated by the hot water supply side heat exchanger 3 and the water flowing through the hot water supply side bypass passage 16 are mixed, The hot water / water mixing path 25 is supplied while being controlled by the water amount servo valve 20.
[0023]
A hot water supply temperature sensor 22 is attached to the hot water supply passage 15, and a mixing temperature sensor 23 is attached to the hot water mixing passage 25. Accordingly, the output signals (measurement signals) of the water amount sensor 18, the incoming water temperature sensor 21, the can body hot water temperature sensor 22, and the mixing temperature sensor 23 are input to the controller 60 as the control means shown in FIG. The controller 60 controls the heating power and water of the oil burner 6 so that the temperature of the hot water discharged from the hot water supply side heat exchanger 3 to the hot water supply passage 15 and the hot water mixing temperature discharged to the hot water mixing passage 25 become equal to the set values. The proportional valve 19 and the like are controlled.
[0024]
The hot water supply side heat exchanger 3 is provided with a heat exchanger temperature sensor 46 so that the hot water in the hot water supply side heat exchanger 3 can be prevented from boiling. The temperature of water is detected, and the output signal is input to the controller 60.
[0025]
The bath-side heat exchanger 4 constitutes a part of the bath apparatus. That is, the bath apparatus is mainly composed of a bath-side heat exchanger 4 heated by an oil burner 6, a return pipe 61, an outgoing pipe 62, a bath-side bypass 36, and a bubble generating bypass 37. Has been.
[0026]
The return pipe 61 includes a bath-side water intake pipe 33 connected to the entrance of the bath-side heat exchanger 4 and a return pipe 32 connected to the circulation fitting 48 of the bathtub 47. The return pipe 32 is provided with a water level sensor 38, a circulation pump 39, a bath-side water flow switch 40, and a hot water temperature sensor 41 such as a thermistor from the upstream side (tub 47 side) where hot water flows.
[0027]
The forward pipe 62 includes a bath-side hot water discharge pipe 34 connected to the outlet side of the bath-side heat exchanger 4 and an outgoing pipe 35 connected to the circulation fitting 48 of the bathtub 47. An air pipe 45 is connected to the circulation fitting 48, and the air pipe 45 is opened to the atmosphere through an on-off valve (not shown).
[0028]
One of the bath side bypass passages 36 is branched from a connection point between the bath side inlet pipe 33 and the return pipe 32 via a three-way valve 42 as a flow rate adjusting valve, and the other bypasses the bath side heat exchanger 4. Therefore, it connects so that it may join to the connection point of the bath side hot-water supply pipe 34 and the going-out pipe 35.
[0029]
The structure of the three-way valve 42 is shown in the sectional views of FIGS. The three-way valve 42 has a cylindrical valve body 51 rotatably accommodated in a casing 49 that communicates with the return pipe 32, the bath-side bypass 36, and the bath-side water intake pipe 33. A water passage 52 bent in a substantially L shape is opened from the side to the side. The water passage 52 opened on the lower surface of the valve main body 51 is always in communication with the return pipe 32, and the water passage 52 opened on the side surface of the valve main body 51 is on the side of the bath-side water intake pipe 33 as the valve main body 51 rotates. It switches between the (can body side) and the bath side bypass path 36 side (bypass side).
[0030]
The valve main body 51 is attached to a rotating shaft 50 of a stepping motor (pulse step motor) 43 controlled by the controller 60, and the rotation angle is controlled by designating the number of steps of the stepping motor 43 so that it is within a predetermined range. It can be rotated at any angle. Therefore, it can be used not only in the fully opened state on the can body side and in the fully opened state on the bypass side, but also in any half-open state.
[0031]
The bubble generation bypass path 37 is connected between the return pipe 32 and the forward pipe 35 so as to further bypass the bath-side heat exchanger 4 and the bath-side bypass path 36. That is, the forward pipe 35 is arranged above the return pipe 32, the lower part of the bubble generating bypass passage 37 is connected to a position downstream of the circulation pump 39 in the return pipe 32, and the upper part is forward. Connected to the tube 35. In addition, a two-way valve 44 is connected in the middle of the bubble generation bypass path 37. Therefore, the air between the bathtub 47 and the two-way valve 44 opens the two-way valve 44, passes through the bubble generation bypass path 37, and moves to the forward pipe 35 side.
[0032]
Similarly to the three-way valve 42, the stepping motor 44a of the two-way valve 44 is controlled by the controller 60. The bath side bypass passage 36 is used when the three-way valve 42 is controlled to the bypass side to determine circulation or drop hot water, and the bubble generation bypass passage 37 is also used for bubble bath operation. is there.
[0033]
Here, a circulation circuit is constituted by the return pipe 32, the bath side bypass path 36, the forward pipe 35 and the bubble generation bypass path 37. The return pipe 32, the bath-side water inlet pipe 33, the bath-side heat exchanger 4, the bath-side hot water outlet pipe 34, and the forward pipe 35 constitute a follow-up circuit, and the branch pipe branched from the hot-water mixing path 25. 26 is connected to the forward pipe 35 through a vacuum breaker 27, a dropped water electromagnetic valve 28, a water amount sensor 29, a check valve 30 and a connecting pipe 31.
[0034]
Next, means for adjusting the opening of the three-way valve 42 will be described.
The controller 60 includes position tables for the circulation determination mode and the circulation determination preliminary circulation mode.
Here, the circulation determination preliminary circulation mode refers to a circulation determination mode performed when the draft position is equal to or less than the draft position, and the circulation determination mode refers to a circulation determination mode performed when the water level is higher than the draft position.
[0035]
The program selection in each determination mode is determined by the state of the input port of the microcomputer by switching the jumper SW of the controller 60. That is, the circulation determination mode includes three positions A1, A2, and A3 of UP / normal / DOWN, and the circulation determination preliminary circulation mode includes two positions B1 and B2 of UP / normal.
[0036]
The UP position A1 in the circulation determination mode is a position where the circulation flow rate is increased by a predetermined amount as compared with the normal position A2, as shown in FIG. 3, and the three-way valve 42 is slightly opened to the bypass side than the normal position A2. The DOWN position A3 is slightly closed from the normal position A2 so that the circulating flow rate is reduced by a predetermined amount.
[0037]
The UP / normal two positions B1 and B2 in the circulation determination preliminary circulation mode have the same relationship as the position of the circulation determination mode, but the circulation determination preliminary circulation mode is set to have a smaller circulation flow rate than the circulation determination mode. Has been. Then, the circulation determination preliminary circulation mode is initially set, and when the hot water in the bathtub is at or above the draft position, the mode is switched in conjunction with the circulation determination mode.
[0038]
The construction worker determines each position in consideration of the influence of construction conditions such as pipe resistance due to the length of the pipe, performance of the pump, and the like when the bath water heater 1 is constructed. Each position can be easily determined by circulating water in the bathtub 47 on a trial basis. For example, the UP position A1 is alternatively selected when a large circulating flow rate is required, and the DOWN position A2 is alternatively selected when the circulating flow rate may be small.
[0039]
Further, when the position of the circulation determination mode is set, the circulation determination preliminary circulation mode is automatically set in conjunction with it. For example, when the UP position A1 of the circulation determination mode is set, the circulation determination preliminary circulation mode is also set to the UP position B1. When the normal / DOWN positions A2 and A3 in the circulation determination mode are set, the normal position B2 is set in the circulation determination preliminary circulation mode.
In this way, by allowing the circulation determination mode and the circulation determination preliminary circulation mode to be set in conjunction with each other, it is possible to rationalize the mode adjustment work at the time of construction, and to prevent adjustment mismatch in both modes. it can.
[0040]
Next, for example, an operation for performing circulation determination will be described with reference to FIG.
When the water in the bathtub 47 is above the draft position, the bath-side water flow switch 40 is operated, so that the circulation determination preliminary circulation mode is automatically switched to the circulation mode.
[0041]
First, the jumper bit data of the controller 60 is determined (step 1). For example, the combinations of the jumper SWs (JP1 and JP2) in each determination position are as shown in FIG. Therefore, for example, when the UP position is set in advance, the RAM data “UP” is selected (Step 2 and Step 3). Further, the number of steps at the UP position A1 of the three-way valve is read based on the RAM data and set to the target UP position (Steps 4 and 5). The controller 60 controls the three-way valve until a predetermined pulse is counted so that the opening degree of the three-way valve 42 becomes the selected UP position A1 (step 6).
[0042]
As described above, since the opening degree of each of the three-way valves 42 is adjusted in advance to each position, the circulation flow circulating through the circulation circuit at the time of the circulation determination is too small, or on the contrary, the air is sucked in too much. And there is almost no needless millet.
[0043]
Also, if the water level in the bathtub 47 is less than or equal to the draft, water will not circulate even if the circulation pump 39 is operated, so the water flow switch 40 does not operate and it is determined that there is no water in the bathtub 47. Then, circulation determination preliminary circulation is performed. At this time, even if water remains in the piping of the circulation circuit, the position of the three-way valve 42 is set, so that the water in the piping is discharged from the circulation fitting 48 of the bathtub 47 vigorously. Therefore, the discharged water can be prevented from coming into contact with the peripheral wall surface of the bathtub 47 and reflecting upward.
[0044]
When it is determined by the circulation determination preliminary circulation mode that the water level is below the draft, a set amount of hot water (for example, 20 liters) is supplied from the circulation fitting 48 into the bathtub 47. This determination operation is repeated until the amount of hot water (or water) reaches or exceeds the draft position and the hot water circulates.
[0045]
Next, the case where the water level in the bathtub 47 is detected will be described.
When the circulation determination is completed, the circulation pump 39 is stopped as shown in FIG. 6 (step 7), and the three-way valve 42 is controlled to the air bleeding position (bypass side fully opened position) (step 8). When it is confirmed that the two-way valve 44 that has been fully closed or half-opened is fully opened (step 9), the timer starts counting for a predetermined time (for example, 5 seconds) and ends ( In step 10), the three-way valve 42 is controlled to a water level detection position (closed position), and the two-way valve 44 is also closed (steps 11 and 12).
[0046]
If air remains between the bathtub 47 and the two-way valve 44 while the two-way valve 44 is closed after the circulation pump 39 is stopped in this way (particularly in the vicinity of the water level sensor 38 or the circulation). The air remains in the pump 39), and the air moves upward through the return pipe 32 and the bubble generation bypass path 37, passes through the open two-way valve 44, and further moves to the upper forward pipe 35.
[0047]
A predetermined time (for example, 45 seconds) is counted from when the three-way valve 42 is closed (step 13), and when it is confirmed that the two-way valve 44 is closed and the timer is counted, the water level is detected (step 14). The reason why the predetermined time is counted in step 13 is that the water level is detected after a predetermined time elapses after the circulation pump 39 is stopped and the vibration of the piping is eliminated. Step 15 counts for 10 seconds in consideration of the case where the two-way valve 44 has failed.
[0048]
Thus, by closing the two-way valve 44 and the three-way valve 42 after a lapse of a predetermined time after the circulation pump 39 is stopped, air can be released to the upper part of the two-way valve 44 or the three-way valve 42, Air does not remain between the bathtub 47 and the two-way valve 44 and the three-way valve 42. Therefore, an accurate signal of the water level sensor 38 is input to the controller 60 without causing a poor pressure detection of the water level sensor due to the effects of expansion and contraction of residual air, vibration of the circulation pump 39, vibration of water from the can body side, and the like. Therefore, normal water level detection can be performed.
Then, after performing the water level detection in this way, the process proceeds to the next operation such as dropping a predetermined amount of hot water to the set water level.
[0049]
Note that the present invention is not limited to the above-described embodiment. For example, the circulation determination mode includes two positions other than three positions of UP / normal / DOWN. It can be set. In addition, the circulation determination preliminary circulation mode can be set to a plurality of three or more positions in addition to the UP / normal two positions.
[0050]
Further, the valve for releasing the air when the water level is detected is not limited to the two-way valve 44 provided in the bubble generation bypass passage 37, but may be any one provided in the piping portion where the air rises. It is also possible to let air escape through the valve 42. In such a case, the flow rate adjusting valve for adjusting the circulating water amount and the valve for releasing air are the same.
[0051]
【The invention's effect】
As described above, in the control apparatus for the bath water heater of the present invention, the bypass passage 37 is configured such that the air between the bathtub and the valve can move above the valve, and the air escapes above the valve. After that, the valve is closed, and the control means is prepared in advance so that a plurality of positions with different opening degrees of the flow rate adjusting valve can be selected, and the control means has the flow rate at the opening degree of the selected position. Since the regulating valve is controlled, there is an advantage that it is possible to easily achieve the circulation determination according to each construction condition and the automation of the water level detection in the bathtub without remaining air.
[0052]
Also, when the water level is detected, the downstream side of the water level sensor bathtub is shut off by closing the valve, so that the can body side where the bath-side heat exchanger and the combustion device are arranged is in a combustion operation, for example, the hot water supply side is in a combustion operation. Even if it carries out, it can prevent that the vibration is transmitted to a sensor by using the water in piping as a medium, and it becomes possible to detect an accurate water level, without having a bad influence.
[0053]
The bathtub water level detection method of the present invention is configured such that the bath-side heat exchanger is heated by the combustion device, constitutes a circulation circuit for circulating water in the bathtub, and is provided downstream and above the water level sensor. Since the water level in the bathtub is detected by the water level sensor after the air between the bathtub and the valve has escaped to the upper part via the other valve, it is possible to detect the water level reliably without being affected by the air. It becomes.
[0054]
The water level detection device for a bathtub according to the present invention is provided in a pipe portion where the valve is located downstream of the water level sensor and the air in the pipe can move upward, and the air between the bathtub and the valve is located above the valve. Since the control means for closing the valve to shut off the pipe line downstream of the water level sensor after the predetermined time has elapsed from the stop of the pump so as to escape, the above method can be easily implemented. When the water level is detected, the valve on the downstream side of the water level sensor bathtub is closed and shut off to shut off the vibration of water from the can side where the bath-side heat exchanger and combustion device are located. It becomes possible to detect the water level with high accuracy.
[0055]
In the circulating flow rate control device of the present invention, the control means is prepared in advance so that a plurality of positions having different opening degrees of the flow rate adjustment valve can be selected, and the control means sets the flow rate adjustment valve to the opening degree of the selected position. Therefore, the circulating water corresponding to each construction condition can be circulated in the circulation circuit, and the circulation judgment and the like can be performed reliably.
[0056]
In addition, the control means includes a circulation determination mode that is performed when the water level in the bathtub is above the draft position, and a circulation preliminary determination mode that is performed when the water level is lower than the draft position. This position is set so that the circulation flow rate is smaller than the position in the circulation judgment mode, so it is possible to make an appropriate circulation judgment according to the water level relative to the draft position, especially when the water in the bathtub is below the draft. Even if water remains in the piping of the circulation circuit, the flow rate adjustment valve is set at a predetermined position, so that the water in the piping is discharged from the circulation fitting of the bathtub vigorously. In other words, the discharged water can be prevented from coming into contact with the peripheral wall surface of the bathtub and reflecting upward.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a control device for a bath water heater according to an embodiment of the present invention.
FIG. 2 is an overall configuration diagram showing the bath water heater.
FIG. 3 is a diagram showing a relationship between an opening state of the three-way valve and a circulation flow rate.
FIG. 4 is a flowchart in the same circulation determination mode.
FIG. 5 is a diagram showing combinations of jumper SWs.
FIG. 6 is a flowchart showing an operation of water level detection.
7A and 7B are schematic cross-sectional views showing the structure of a three-way valve, respectively.
[Explanation of symbols]
3 Hot water supply side heat exchanger
4 Bath-side heat exchanger
6 Combustion device (oil burner)
32 Return pipe
33 Bath side inlet pipe
34 Bath side hot water pipe
35 Outward pipe
37 Bypass (Bubble-generating bypass)
38 Water level sensor
39 Pump (circulation pump)
42 Three-way valve (flow adjustment valve)
44 valves (two-way valves)
47 Bathtub
60 Control means (controller)

Claims (5)

The bath-side heat exchanger is heated by the combustion device, constitutes a circulation circuit for circulating the water in the bathtub, and is connected to the bathtub and the valve via a valve provided downstream and above the water level sensor. A method for detecting a water level in a bathtub, wherein the water level in the bathtub is detected by a water level sensor after the air between the air has escaped upward. In the circulation circuit for circulating water in the bathtub, a pump, a water level sensor for detecting the water level in the bathtub, and a valve are provided, and the water level in the bathtub is detected by the signal of the water level sensor with the valve closed. In the water level detection device in the bathtub, the valve is provided in a pipe portion that is downstream of the water level sensor and in which the air in the pipe can move upward, and controls the air between the bathtub and the valve. And a control means for closing the valve so as to shut off the pipe line downstream of the water level sensor after a predetermined time has elapsed from the stop of the pump. Water level detection device. A circulation circuit for circulating water in the bathtub is provided with a pump and a flow rate adjusting valve for adjusting the amount of circulating water, and the opening degree of the flow rate adjusting valve is controlled to circulate a predetermined amount of circulating water. In the circulating flow rate control device provided with the control means, the control means is prepared in advance so that a plurality of positions having different opening degrees of the flow rate adjusting valve can be selected, and the control means is set to the opening degree of the selected position. A circulation flow rate control device for controlling a flow rate adjustment valve. A circulation circuit for circulating water in the bathtub is provided with a pump and a flow rate adjusting valve for adjusting the amount of circulating water, and the opening degree of the flow rate adjusting valve is controlled to circulate a predetermined amount of circulating water. In the circulation flow rate control device provided with the control means, the control means includes a circulation determination mode performed when the water level in the bathtub is above the draft position, and a circulation preliminary determination performed when the water level is below the draft position. A circulation flow rate control device, wherein the circulation determination preliminary circulation mode position is set so that the circulation flow rate is smaller than that of the circulation determination mode position. The bath-side heat exchanger is heated by the combustion device, and constitutes a circulation circuit for circulating water in the bathtub, and the circulation circuit is connected to the entrance side of the bath-side heat exchanger. A return pipe connected to the bathtub side, a bath side hot water pipe connected to the outlet side of the bath side heat exchanger, an outward pipe connected to the bathtub side, and one of the bath side inlet pipe and the return pipe A bath-side bypass path that is branched from the connection point to the connection point between the bath-side hot water discharge pipe and the forward pipe so as to bypass the bath-side heat exchanger. A water level sensor and a pump for detecting a water level in the bathtub at a position upstream of a connection portion of the return pipe with the bypass path, the bypass path being connected between the return pipe and the forward pipe A valve is provided in the bypass passage, and the valve and In the control device of the bath water heater configured so that the flow rate adjusting valve is controlled by the control means, the bypass path is configured such that the air between the bathtub and the valve is movable above the valve, After the valve escapes above the valve, the valve is closed, and the control means is prepared in advance so that a plurality of positions with different opening amounts of the flow rate adjusting valve can be selected, and the control means is selected. A control device for a bath water heater, wherein the flow rate adjusting valve is controlled to an opening degree of a position.

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