JP2010117042A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater capable of suitably preventing or suppressing drain in a drain pipe from flowing into a bathtub even if the drain pipe is damaged, when a double pipe structure in which the drain pipe is inserted to a bath pipe is adopted. <P>SOLUTION: The water heater WH includes a drain storage part 3 for storing the drain generated according to heat recovery using a heat exchanger and a drain pump P3 for making the drain stored in the drain storage part 3 flow into the drain pipe 6 and for guiding the drain to a predetermined drainage place. The water heater includes a double pipe structure part D in which the drain pipe 6 is inserted into the bath pipe 7A and the termination side part 6a of the drain pipe 6 is drawn out from the bath pipe 7A. The drain pump P3 is provided for the termination side part 6a of the drain pipe 6, and the inside of the drain pipe 6 becomes a negative pressure status when the drain pump P3 is driven. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention makes it possible to perform hot water heating by performing heat recovery from a heating medium such as combustion gas by using a heat exchanger, and to appropriately perform drainage treatment of drains generated by heat recovery. Relates to a heated water apparatus.

  As an example of a conventional hot water apparatus, there is one described in Patent Document 1. The hot water apparatus described in the document is configured to recover sensible heat and latent heat from combustion gas generated by the combustor using a heat exchanger, and perform hot water heating. When latent heat is recovered from combustion gas, an acidic drain is generated. This drain is neutralized using a neutralizer and then led to the outside of the hot water device using a drain pipe. Yes. On the other hand, the hot water apparatus is also provided with two bath pipes for hot water supply to the bathtub and replenishment of the bath, and the drain pipe described above is along the outer surface of the two bath pipes. It extends to the vicinity of the bathtub and is provided so that the drain can be discharged to the drain of the bathroom.

  However, as described above, when the drain pipes are arranged along the outer surfaces of the two bath pipes, the three pipes extend from the hot water device to the bathroom in a large and bulky state. Occupies more space. Moreover, when providing the hole for drawing in three said piping in the outer wall of a house, the necessity of enlarging the size of this hole or providing the extra hole for letting drain piping pass through arises.

As a means for solving the above-described problems, it is conceivable to insert a drain pipe into one of the two bath pipes and to make the drain pipe and the bath pipe into a double pipe structure.
However, when such a means is adopted, if the drain pipe is damaged for some reason such as deterioration of the drain pipe, the drain that has flowed out of the drain pipe to the outside passes through the bath pipe to the bathtub. There is concern about the flow. As described above, the drain is a condensation of water vapor contained in the combustion gas, and may contain components in the combustion gas. For this reason, even if the neutralization process of the drain is performed, it is not preferable that the drain flows into the bathtub, which causes anxiety to the user. Therefore, it is desired that such a situation is appropriately prevented or suppressed.

JP 2006-112763 A

  The present invention has been conceived under the circumstances as described above, and when the double pipe structure in which the drain pipe is inserted into the bath pipe is adopted, even if the drain pipe is damaged, It is an object of the present invention to provide a hot water device that can appropriately prevent or suppress the drain in the drain pipe from flowing into the bathtub and can give the user a sense of security.

  In order to solve the above problems, the present invention takes the following technical means.

  A hot water device provided by the present invention includes a heat exchanger for performing hot water heating by performing heat recovery from a heating medium, a drain storage section for storing a drain generated in association with the heat recovery, A drain pump for flowing the drain stored in the drain storage portion into the drain pipe and guiding it to a predetermined drainage point, and a bath pipe for performing at least one of hot water supply to the bathtub and bath reheating operation A double pipe in which the drain pipe is inserted into the bath pipe, and a portion close to the end of the drain pipe on the downstream side in the drain flow direction is drawn out from the bath pipe. The drain pump is provided near the end of the drain pipe, and the drain pump is driven to drive the drain. When the drain of the cut portion flows into the drain pipe, in the drain pipe is characterized in that it is configured such that a negative pressure state.

  According to such a configuration, when the drain pump is driven and the drain in the drain reservoir passes through the drain pipe, the inside of the drain pipe is in a negative pressure state. For this reason, even if the drain pipe is damaged, it is unlikely that the drain will flow out of the negative pressure drain pipe into the bath pipe inside the double pipe structure. Therefore, the drain is preferably prevented or suppressed from flowing into the bathtub through the bath pipe, and a sense of security can be given to the user.

  In a preferred embodiment of the present invention, the bath pipe is a bath that connects the suction side of a bath pump and the bathtub, and guides hot water from the bath to the bath pump when the bath pump is driven. A return pipe, and a bath outlet pipe that connects the discharge side of the bath pump and the bathtub and returns hot water drawn into the bath pump through the bath return pipe to the bathtub. The heavy pipe structure is configured such that when the drain pipe is inserted into the bath outlet pipe and the bath pump is driven, the pressure in the bath outlet pipe is higher than that in the drain pipe.

  According to such a configuration, when the drain pipe is broken, the drain is less likely to flow out from the drain pipe into the bath pipe. Therefore, it is more preferable in preventing the drain from flowing into the bathtub.

  In a preferred embodiment of the present invention, it is possible to detect a change in flowing water pressure or flowing water pressure in the drain pipe, and when the bath pump is driven, the drain pipe is driven along with the driving of the bath pump. When the amount of flowing water increases or when the flowing water pressure rises, there is provided judging means for judging that the drain pipe is damaged or has other abnormalities.

According to such a configuration, the following effects can be obtained.
In other words, when the drain pipe in the double pipe structure is damaged, when the bath pump is driven and hot water is circulated through the bath pipe at a predetermined pressure, the hot water enters the drain pipe. Inflow, the amount of flowing water in the drain pipe increases, or the flowing pressure rises. According to the above configuration, when such a phenomenon occurs, it is determined that damage or other abnormality has occurred in the drain pipe, and it is possible to accurately detect that the abnormality has occurred. . In particular, in the above-described configuration, since the bath pump is driven and the discharge pressure of the bath pump is acting on the drain pipe, that is, it is possible to detect damage under conditions where the drain pipe is easily damaged. Therefore, early abnormality detection becomes possible, which is more preferable. According to the said structure, compared with the case where that is not detected although abnormality has generate | occur | produced in drain piping, the effect that a greater sense of security can be given to a user is also acquired. In addition, if the user is notified that an abnormality has occurred using appropriate notification means, the user can quickly take appropriate countermeasures.

  In a preferred embodiment of the present invention, the determination means detects a change in the amount of flowing water or the flowing water pressure in the drain pipe based on the driving current, driving power, or data corresponding thereto of the drain pump. When it is possible and the value of the driving current, driving power, or data corresponding to the drain pump is out of a predetermined range, it is determined that the drain pipe is damaged or has other abnormality. It is configured.

  According to such a configuration, it is possible to accurately detect a change in the flow rate or flow pressure in the drain pipe based on the drain pump drive current or other data, and when the drain pipe is damaged. It is possible to accurately detect an increase in the amount of flowing water or an increase in the flowing water pressure in the drain pipe by simple data processing.

  In a preferred embodiment of the present invention, when the drain pump driving current, the driving power, or the data value corresponding thereto deviates beyond a predetermined range due to a drain outflow driving load increase due to clogging, The drain pipe is determined to be clogged or other abnormalities.

  According to such a configuration, when the drain pipe is clogged, and the water flow pressure in the drain pipe rises abnormally due to this clogging, or the amount of water flow decreases, this is accurately detected. be able to. Therefore, it becomes possible to cope with such an abnormality appropriately. When a double pipe structure is provided, the drain pipe needs to have a relatively small diameter because it is necessary to insert the drain pipe into the bath pipe. However, if the drain pipe has a small diameter, clogging is likely to occur. It is preferable that clogging can be detected as described above.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 and 2 show an example of a hot water apparatus to which the present invention is applied and a configuration related thereto. As shown in FIG. 1, the hot water apparatus WH of the present embodiment includes hot water supply and heating hot water apparatus main body parts 1A and 1B, a neutralizer 2, a drain storage part 3, a control part 4, an exterior case 5, and drain piping. 6, a drain pump P3, two bath pipes 7A and 7B, and a double pipe structure D in which a part of the drain pipe 6 is inserted into the bath pipe 7A. The outer case 5 surrounds and protects the hot water device main body portions 1A and 1B, the neutralizer 2, the drain storage portion 3, the control portion 4, and the like. The control unit 4 corresponds to an example of a determination unit referred to in the present invention.

  The hot water supply main body 1A for hot water supply is a part for generating hot water to be supplied to, for example, a kitchen, a washroom, and a bathroom. The heating hot water device main body 1B is a portion for heating hot water (including antifreeze liquid) as a heating medium of a heating device such as a hot water floor heating device. These hot water supply and heating hot water apparatus main body portions 1A and 1B are composed of combustors 12a and 12b disposed in casings 11a and 11b into which combustion air is sent by fans 10a and 10b, and the combustors 12a and 12b. Primary heat exchangers 13a and 13b and secondary heat exchangers 14a and 14b capable of recovering sensible heat and latent heat from the generated combustion gas are provided.

  The hot water heat exchangers 13a and 14a are connected to the water inlet 80a and the hot water outlet 81a via the piping portions 80 and 81, respectively. The water supplied from the outside to the water inlet 80a is led to the heat exchangers 14a and 13a and heated, and the hot water generated by this heating is led to the hot water outlet 81a. It is supplied to a desired position. The hot water is also used for filling the bathtub 9. That is, the pipe part 81 and the bath pipe 7B are connected via the auxiliary pipe part 82. When the on-off valve V1 provided in the auxiliary pipe part 82 is opened, the hot water in the pipe part 81 is supplied to the bath pipe 7B. Supplied. However, the bath pump P1 is driven when the bath 9 is filled with hot water. Thus, hot water that has reached the bath pipe (bath return pipe) 7B from the auxiliary pipe section 82 is supplied to the bathtub 9 through the bath pipe (bath pipe) 7A after passing through the bath pump P1. Each of the two bath pipes 7A and 7B has one end connected to the bathtub 9 to form a hot water circulation path. When performing a bath reheating operation, the bath pump P1 is driven and the bath 9 After being pumped up from the bath pipe 7B to the bath pump P1, it is heated by the heat exchanger 89 and then returned to the bathtub 9 through the bath pipe 7A. In the heat exchanger 89, as a medium for heating the hot water pumped up from the bathtub 9, hot water heated in the hot water main body 1B for heating is used, for example.

  The heat exchangers 13b and 14b for heating are connected to the water inlet 83a and the hot water outlet 84a via the piping parts 83 and 84, and the hot water returned from the heating device to the water inlet 83a is the heat exchangers 14b and 13b. After being heated, the hot water is supplied again from the hot water outlet 84a toward the heating device. In addition, between the heat exchangers 13b and 14b for heating, the piping part 86 which has the heating hot-water tank 85 and the pump P2 is provided. These are for circulating hot water while replenishing hot water in the piping parts 83 and 84 and the piping for the heating device connected thereto. The heating / hot water tank 85 includes a liquid level sensor (not shown) and can supply water from the water supply pipe section 80b branched and connected to the pipe section 80, so that the tank 85 is always constant. It is controlled so that there is more hot water than the amount. A piping part 87 for guiding overflow water to the drain storage part 3 is connected to the heating hot water tank 85. According to such a configuration, the overflow water from the heating / hot water tank 85 can be allowed to flow into the drain storage part 3 and then discarded together with the drain that separately flows into the drain storage part 3.

  The neutralizer 2 is for neutralizing an acidic drain generated when latent heat is recovered from the combustion gas by the heat exchangers 14a and 14b. In the container 20 made of synthetic resin, granular calcium carbonate is provided. It is the structure in which neutralizing agents 21 such as these are accommodated. The drains generated on the surfaces of the heat exchangers 14a and 14b are received by the drain receiving part 15 provided below the heat exchangers 14a and 14b, and then introduced into the neutralizer 2 through the pipe part 88. After being neutralized by contact, the gas is discharged from the discharge port 22.

  The drain storage part 3 is a part for temporarily storing the drain discharged from the discharge port 22 of the neutralizer 2. As will be described later, the drain reservoir 3 can be integrated with the neutralizer 2. As clearly shown in FIG. 2, the drain reservoir 3 is connected to the drain inlet 30, the overflow water inlet 31 from the heating hot water tank 85 described above, and the drain pipe 6. In addition to the outflow port 32, a water level detector 33 having three electrodes 33a to 33c is provided.

  The water level detector 33 has a ground electrode 33a, a low water level detection electrode 33b, and a high water level detection electrode 33c. It is possible to detect the water level of the drain based on the difference from the state in which it is not electrically conducted without being immersed in. When the drain water level reaches the high water level LH reaching the lower end of the electrode 33c, the drain pump P3 starts to be driven, and the drain is discharged from the drain reservoir 3. Thereafter, when the drain water level becomes a low water level LL lower than the lower ends of the electrodes 33a and 33b, the driving of the drain pump P3 is stopped. Such control is executed by the control unit 4.

  The double-pipe structure D is a portion where the drain pipe 6 is inserted into the bath pipe 7A outside the exterior case 5 (see also FIG. 3A). The drain pipe 6 is inserted into the bath pipe 7A using, for example, a hole 70a provided in the joint 70 for attaching the bath pipe 7A to the exterior case 5. A joint 71 for attaching the bathtub 9 to the adapter 90 is provided at the end of the bath pipe 7A, and a portion 6a near the end of the drain pipe 6 is drawn out from a hole 71a provided in the joint 71. Yes.

  The drain pump P3 is provided at the end portion 6a of the drain pipe 6. The drain discharged from the drain pump P3 is, for example, a bath hot water discharge port (not shown) provided on the bathroom floor. It can be discharged. In the bathroom, a data communication with the control unit 4 is possible, and a remote control 40 is provided for the bather to operate. The remote control 40 is connected to the drain pump P3 via a communication line. Yes. The drive control of the drain pump P3 by the control unit 4 is performed via the remote controller 40. Further, the driving power is supplied to the drain pump P3 from the remote controller 40 using the communication line.

  The control part 4 is comprised using the microcomputer etc., and performs operation control of each part of the hot water apparatus WH. As will be described later, the control unit 4 determines whether there is an abnormality such as breakage or clogging in the drain pipe 6 based on the drive current of the drain pump P3, and details thereof will be described later. The drive current data of the drain pump P3 is detected by the remote controller 40 and transmitted to the control unit 4. However, the transmission of such data may be omitted, and the data processing means provided in the remote controller 40 may be used to determine whether or not there is an abnormality in the drain pipe 6.

  Next, the operation of the hot water device WH will be described.

  First, in the hot water heating operation for hot water supply and heating, as described above, heat recovery is performed by the heat exchangers 13a, 13b, 14a, 14b from the combustion gas generated by driving the combustors 12a, 12b. It is done by. The acidic drain that is generated along with the latent heat recovery using the heat exchangers 14a and 14b is introduced from the drain receiving portion 15 into the neutralizer 2 and neutralized, and then flows into the drain storage portion 3. The drain pump P3 starts driving when the drain water level in the drain reservoir 3 reaches a predetermined high water level LH, and repeats the operation of stopping when the drain water level reaches a predetermined low water level LL. By such driving of the drain pump P3, the drain of the drain storage part 3 passes through the drain pipe 6 and is sucked into the drain pump P3 and then drained into the bathroom drain. Overflow water from the heating hot water tank 85 is also drained to the bathroom outlet along with the drain. Since the double pipe structure D in which the drain pipe 6 is inserted into the bath pipe 7A is provided outside the exterior case 5, for example, two pipes can be used without adopting such a double pipe structure. Compared with the case where the drain pipes 6 are arranged outside the bath pipes 7A and 7B, it is possible to suppress the plurality of pipes from becoming large and bulky, and to reduce their occupied space. Moreover, the opening area of the hole provided in the outer wall of the bathroom for drawing said piping into the bathroom from the outdoors can also be made small.

  As shown in FIG. 3 (b), there is a possibility that the hole 69 is broken in the drain pipe 6 due to some cause. On the other hand, the drain pump P3 is provided at the end portion 6a of the drain pipe 6, and when the drain pump P3 is driven, the inside of the drain pipe 6 is in a negative pressure state. Therefore, in the double-pipe structure D, the drain in the drain pipe 6 is appropriately prevented from passing through the hole 69 and flowing out into the bath pipe 7A. Since the bath pipe 7A is connected to the discharge side of the bath pump P1, the pressure P2 in the bath pipe 7A is higher than the pressure P1 in the drain pipe 6 when the bath pump P1 is driven. . Therefore, it is possible to more thoroughly prevent the drain from flowing out of the drain pipe 6 into the bath pipe 7A. As a result, many drains are also prevented from flowing into the bathtub 9 through the bath pipe 7A.

  FIG. 4 shows an example of a basic operation procedure of abnormality detection executed by the control unit 4. This will be described below.

  In addition, the control part 4 can detect the change of the flowing water quantity or flowing water pressure in the drain piping 6 as a premise structure for performing the operation | movement procedure shown in FIG. As will be described later, this can be preferably realized by causing the control unit 4 to monitor the drive current of the drain pump 6, for example. When the bath pump P1 is driven (S20: YES), the controller 4 determines whether the flowing water amount in the drain pipe 6 has increased or the flowing water pressure has increased with the driving of the bath pump P1. Judgment is made (S21). In this case, if the flow rate has increased by a minute amount, or if the flow pressure has increased by a minute value, this is ignored and whether the flow rate has increased beyond a predetermined value or the flow pressure has increased. It may be determined whether or not it has risen above a predetermined value.

  When the controller 4 determines that the amount of flowing water in the drain pipe 6 has increased or the flowing water pressure has increased as the bath pump P1 is driven, the drain pipe 6 has been damaged or other abnormality has occurred. Judgment is made (S21: YES, S22). In the event that the drain pipe 6 in the double pipe structure D is damaged and the hole 69 is opened in the drain pipe 6 as shown in FIG. 3 (b), the bath pump P3 is driven and the bath pipe is driven. When hot water flows through 7A at a predetermined pressure, as described above, since this hot water flows into the drain pipe 7A, the amount of flowing water in the drain pipe 6 increases or the flowing water pressure rises. Since the control unit 4 accurately detects such a phenomenon and determines that damage or other abnormality has occurred in the drain pipe 6, it is possible to accurately detect the abnormality. When the bath pump P3 is driven, the discharge pressure of the bath pump P3 acts on the peripheral wall portion of the drain pipe 6. Therefore, when the drain pipe 6 is deteriorated, the bath pump P3 is driven. The drain pipe 6 is the most easily damaged condition. In the above determination process, damage can be detected at a timing that matches such a condition, which is more preferable in quickly detecting damage.

  More specifically, the control unit 4 can execute an operation process as shown in FIG. 5 and will be described below.

First, the control unit 4 obtains a reference current value I ₀ of the drain pump P3 (S1). The reference current value I ₀ is a current value when the drain pump P3 rotates at a predetermined rotational speed under normal conditions in which the drain pipe 6 is not clogged or damaged. When determining this reference current value I ₀ , the average value when the drain pump P3 is driven a plurality of times is adopted in consideration of the influence of air entrainment into the drain pump P3. It is preferable to use a technique. However, when the drain pump P3 has already finished the air bleeding operation, such learning operation may be omitted.

The controller 4 monitors the drive current when the drain pump P3 is driven in the state where the hot water device WH is actually operating. In this monitoring, when the drive current value I is lower than the reference current value I ₀ than the predetermined value αI, that is, when I <I ₀ + α1 (S4: YES), the drain pipe 6 is clogged. There is a risk. More specifically, when the drain pipe 6 is clogged, the drain flow rate is reduced and the work amount of the drain pump P3 is reduced, so that the drive current value I is also reduced. α1, for example, is a value corresponding to the case where the amount of drain inflow into the drain reservoir 3 is larger than the amount of drain discharged when the combustors 12a and 12b are driven to burn with the most popular thermal power. It can be obtained by experiment. The controller 4 then increases the rotational speed of the drain pump P3 (S3), but this rotational speed increase is for accurate determination and can be omitted. Further, this rotation speed increase may be either constant current control or constant voltage control. This also applies to the case where the rotational speed is reduced in step S9 described later. When the relationship of I <I ₀ + α2 (where α2 is a preset value and α2> α1) is established in a state where the rotational speed of the drain pump P3 is increased (S4: YES), control is performed. The unit 4 determines that the drain pipe 6 is clogged or has an abnormality similar to this (S5). Next, the control unit 4 performs a notification operation to that effect and stops the operation of the hot water device WH (S6, S7). The notification operation is performed, for example, by causing the remote controller 40 to display a screen to that effect or by generating an alarm sound on the remote controller 40.

Unlike the above, when the drive current value I of the drain pump P3 exceeds the reference current value I ₀ by a predetermined value β1, that is, when I> I ₀ + β1 (S8: YES), There is a possibility that the drain pipe 6 is damaged. That is, when the drain pipe 6 is damaged and hot water in the bath pipe 7A is also sucked by the drain pump P3, the work amount of the drain pump P3 increases and the drive current value I also increases. The values of β1 and β2 described later can be determined as appropriate. Thereafter, the control unit 4 determines whether or not the relationship of I> I ₀ + β1 is satisfied after the rotational speed of the drain pump P3 is lowered (S9) for the purpose of accurately performing the determination. This step S9 can also be omitted similarly to step 3. When the above relationship is established, the control unit 4 determines that the drain pipe 6 is broken or has an abnormality similar to this (S10: YES, S11), and notifies the fact using the remote controller 40 or the like. Then, the operation of the hot water device WH is stopped (S12, S7).

  According to the series of operation procedures described above, abnormalities such as clogging or breakage of the drain pipe 6 can be accurately detected by simple data processing for monitoring the drive current of the drain pump P3. If an abnormality is detected and a notification to that effect is given, the user can detect this and take appropriate countermeasures. As described above, in the hot water apparatus WH of the present embodiment, when the drain pipe 6 is damaged, the drain can be prevented or suppressed from flowing into the bathtub 9, but such a damaged state is still overlooked. This is not preferable, and since the user can take an appropriate response by detecting the abnormality, there is an advantage that a greater sense of security can be given to the user.

  The abnormality detection described above is performed based on the drive current of the drain pump P3. Instead, the drive power and other parameters (parameters that vary according to the work amount of the drain pump P3) are used. It is also possible to perform abnormality detection based on the above. In the present invention, it is also possible to detect a change in the amount of flowing water or the flowing water pressure in the drain pipe 6 without being based on the current value of the drain pump P3. For example, a flow meter or a pressure gauge may be provided in the drain pipe 6 to detect a change in the amount of flowing water or the flowing water pressure in the drain pipe 6.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the hot water device according to the present invention can be varied in design in various ways.

  For example, as shown in FIG. 6, the drain reservoir 3 can be formed integrally with the neutralizer 2. In the configuration shown in the figure, a part of the container 20 constituting the neutralizer 2 is formed as the drain reservoir 3 that is not filled with the neutralizing agent 21, and the region that is filled with the neutralizing agent 21. The drain neutralized by passing through (the part of the neutralization treatment tank) is configured to flow into the drain storage unit 3 and be stored as it is. According to such a configuration, it is possible to reduce the overall size as compared with the case where the drain storage portion 3 and the neutralizer 2 are formed separately and these are connected by piping. The drain storage part as used in the present invention is only required to temporarily store a certain amount of drain, and may be provided attached to other devices.

  As the heating medium in the present invention, for example, high-temperature exhaust gas other than the combustion gas can be used. Unlike the above-described embodiment, the hot water device according to the present invention may not have a configuration in which two hot water device main bodies for hot water supply and heating are combined, for example, for hot water supply that does not have a heating function. It may be configured as a hot water device. The drainage location of the drain can be selected as appropriate, and can be a location different from the drainage port of the bathtub hot water.

It is a schematic explanatory drawing which shows an example of the hot water apparatus which concerns on this invention. It is principal part explanatory drawing of the hot water apparatus shown in FIG. 3A is a cross-sectional view taken along the line III-III in FIG. 2, and FIG. 3B is a cross-sectional view illustrating a state where the drain pipe shown in FIG. It is a flowchart which shows an example of the basic operation processing procedure of the abnormality detection by the control part of the hot water apparatus shown in FIG. It is a flowchart which shows an example of the specific operation processing procedure of the control part of the hot water apparatus shown in FIG. It is a principal part schematic sectional drawing which shows the other example of this invention.

Explanation of symbols

WH Hot water apparatus D Double pipe structure part P3 Drain pump 3 Drain storage part 4 Control part (determination means)
6 Drain piping 6a Near end portion (of drain piping)
9 Bathtub 7A, 7B Bath piping 13a, 13b Heat exchanger 14a, 14b Heat exchanger

Claims (5)

A heat exchanger for performing hot water heating by recovering heat from the heating medium;
A drain storage part for storing a drain generated along with the heat recovery;
A drain pump for flowing the drain stored in the drain storage part into the drain pipe and leading it to a predetermined drainage point;
Bath piping for performing at least one of hot water supply to the bathtub and bathing operation,
A hot water device comprising:
The drain pipe is inserted into the bath pipe, and a portion near the end of the drain pipe on the downstream side in the drain flow direction is provided with a double pipe structure part drawn out from the bath pipe,
The drain pump is provided near the end of the drain pipe, and when the drain pump is driven and the drain in the drain reservoir flows into the drain pipe, the drain pipe is in a negative pressure state. It is comprised so that it may become. The hot water apparatus characterized by the above-mentioned. The hot water device according to claim 1,
The bath piping includes a bath return pipe that connects the suction side of the bath pump and the bathtub, and guides hot water from the bathtub to the bath pump when the bath pump is driven, and discharge of the bath pump There is a bath outlet pipe connecting the side and the bathtub and returning hot water sucked into the bath pump through the bath return pipe to the bathtub,
The double pipe structure is configured such that when the drain pipe is inserted into the bath outlet pipe and the bath pump is driven, the pressure in the bath outlet pipe is higher than that in the drain pipe. apparatus. The hot water device according to claim 2,
A change in the amount of flowing water or the flowing water pressure in the drain pipe can be detected, and when the bath pump is driven, the amount of flowing water in the drain pipe increases with the driving of the bath pump, or the flowing water A hot water apparatus comprising a judging means for judging that the drain pipe is damaged or has other abnormality when the pressure rises. The hot water device according to claim 3,
The determination means can detect a change in the amount of flowing water or flowing water pressure in the drain pipe based on the driving current, driving power, or data corresponding to the drain pump, and the drain pump A hot water apparatus configured to determine that the drain pipe is damaged or has other abnormality when a value of driving current, driving power, or data corresponding thereto deviates from a predetermined range. The hot water device according to claim 4,
When the drain pump driving current, driving power, or data corresponding thereto deviates beyond a predetermined range due to an increase in drain outflow driving load due to clogging, the judging means is clogged in the drain piping or other abnormalities. A hot water device that is configured to determine that there is.

Images