JP5228806B2 - Water heater - Google Patents

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 recovery is performed 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. ing. On the other hand, the hot water device is also provided with two bath pipes for hot water supply to the bathtub and replenishment of the bath, and the drain pipe is arranged 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 outlet 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. The occupied space of piping increases. Further, in the case where the holes for drawing the three pipes are provided on the outer wall of the house, it is necessary to increase the size of the holes or to provide an extra hole for passing the drain pipe.

As a means for solving the above-mentioned problems, it is conceivable to insert a drain pipe into one of the two bath pipes and to make this part 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 from the drain pipe passes through the bath pipe. Concern about flowing into the bathtub. Since such a situation is not very favorable for the user, when an abnormality such as breakage occurs in the drain piping, it is possible to detect the fact at an early stage so that appropriate countermeasures can be taken. It is desirable. However, conventionally, no means has been proposed for appropriately dealing with such a situation.

JP 2006-112763 A

  The present invention has been conceived under the circumstances as described above, and when a double pipe structure in which a drain pipe is inserted into a bath pipe is employed, the drain pipe has an abnormality such as breakage. It is an object of the present invention to provide a hot water device that can quickly and appropriately detect that when it occurs.

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

  A hot water apparatus provided by the first aspect of the present invention includes a heat exchanger for performing hot water heating by performing heat recovery from a heating medium, and a drain generated along with the heat recovery at a predetermined drainage location. A hot water apparatus comprising: a drain pipe for leading to a water bath; and a bath pipe for performing at least one of a hot water supply to a bathtub and a bath reheating operation, wherein the drain pipe is the bath pipe A double-pipe structure part inserted into the double-pipe structure part, and the double-pipe structure part is configured such that the inside and the outside of the drain pipe are electrically insulated from each other. Monitoring whether the inner and outer electrical insulation states of the drain pipe in the section are maintained, and if the electrical insulation state is not maintained, the drain pipe is damaged or Determination means for determining that there is other abnormality, it is characterized in that it comprises further.

According to such a configuration, the following effects can be obtained.
That is, if the drain pipe in the double pipe structure is damaged, the drain flows out from the inside of the drain pipe, or hot water flowing in the bath pipe flows into the drain pipe. When the phenomenon occurs, the inside and outside of the drain pipe are electrically connected via the drain and hot water, and the insulation state is lost. According to the present invention, when such a phenomenon occurs, it is determined that damage or other abnormality has occurred in the drain piping. When an abnormality occurs, that fact is quickly and accurately determined. It is possible to detect. Therefore, it is possible to give a great sense of security to the user as compared with a case where the fact is not detected even though abnormality has occurred in the drain piping. If the user is notified that an abnormality has occurred using appropriate notification means, the user can take appropriate countermeasures at an early stage.

  In a preferred embodiment of the present invention, the drain pipe is configured using a non-conductive tube, and a first conductor portion extending in the longitudinal direction of the tube is provided inside the tube. The bath pipe is a second conductor portion because the material is a conductive member, or a longitudinal direction of the bath pipe in an area outside the drain pipe in the bath pipe. The determination means applies a voltage to the first and second conductor portions, and electrically connects between the first and second conductor portions. When conduction occurs, it is determined that there is an abnormality in the drain pipe.

  According to such a configuration, since the distance between the first and second conductor portions can be shortened, even if the conductivity of the drain or hot water is relatively low, the drain pipe is damaged. When this abnormality occurs, electrical conduction can be easily generated between the first and second conductor portions via the drain or hot water. Therefore, the abnormality detection accuracy can be further increased.

  The hot water device provided by the second aspect of the present invention comprises a heat exchanger for performing hot water heating by recovering heat from a heating medium, and a drain generated by the heat recovery with a predetermined drainage point. A hot water apparatus comprising: a drain pipe for leading to a water bath; and a bath pipe for performing at least one of a hot water supply to a bathtub and a bath reheating operation, wherein the drain pipe is the bath pipe A double-pipe structure inserted into the drain, a drain reservoir located upstream of the double-pipe structure and connected to the drain pipe, and a drain water level or a water level in the drain reservoir A water level detecting means capable of detecting a change, and determining whether or not the drain water level of the drain storage portion has changed along with the circulation of the hot water when the hot water is circulated in the bath pipe. And when it is determined that the drain water level with the hot water flow changes is characterized by further comprising a determining means for determining that there is damage or other anomalies in the drain pipe.

According to such a configuration, the following effects can be obtained.
That is, when the drain pipe in the double pipe structure is damaged, when hot water is circulated through the bath pipe, the hot water running through the bath pipe flows into the drain pipe and drain storage is performed. The drain water level of the drainage part rises, or the drain in the drain pipe actively flows out into the bath pipe and the drain water level of the drain storage part falls. According to the present invention, when such a phenomenon occurs, it is determined that damage or other abnormality has occurred in the drain pipe, and the hot water device provided by the first aspect of the present invention Similarly, when an abnormality occurs, it is possible to detect that fact quickly and accurately.

  In a preferred embodiment of the present invention, the apparatus further includes an opening / closing valve provided on the upstream side of the drain storage portion, and the drain pipe is connected to the determination means as hot water flows through the bath pipe. When it is determined whether or not the drain water level has changed, the open / close valve is closed so that the drain does not flow into the drain reservoir.

  According to such a configuration, when it is determined whether or not the drain water level of the drain pipe has changed as hot water flows through the bath pipe, the drain newly flows into the drain reservoir. Thus, since the drain water level does not rise, the above determination can be made more accurately.

  In a preferred embodiment of the present invention, the judgment means has a surge phenomenon in which the water level of the drain storage part temporarily rises or falls above a predetermined width at the initial stage when hot water circulation is started in the bath pipe. When it occurs, it is determined that there is an abnormality in the drain pipe.

  According to such a configuration, even if the drain flows into the drain reservoir (the drain water level rises slowly due to the drain flowing in), the drain is started in the initial stage of the hot water circulation in the bath pipe. It is possible to accurately detect a surge phenomenon in which the water level of the storage part temporarily rises or falls above a predetermined width, and to accurately detect that there is an abnormality in the drain piping. Therefore, it is possible to eliminate the need to provide an on-off valve for controlling the flow of the drain upstream of the drain reservoir.

  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 to 4 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 a drain use. A pipe 6, two bath pipes 7A and 7B, and a drain pipe 6 are provided with 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 is connected to the bathtub 9 to form a constant hot water circulation flow path, and the bath pump P1 is driven when the bath reheating operation is performed. The hot water in the bathtub 9 is pumped up from the bath pipe 7B to the bath pump P1, and then 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. Therefore, unlike the present embodiment, it is possible to eliminate the trouble of providing an overflow water discharge port in the outer case 5, for example, guiding the overflow water from the discharge port to a predetermined location and discarding it.

  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 configured to be integrated with the neutralizer 2. As shown well in FIG. 2, in addition to the drain inlet 30, the overflow water inlet 31 from the heating hot water tank 85 and the outlet 32 described above, the drain reservoir 3 includes 3 A water level detector 33 having two electrodes 33a to 33c is provided. A drain pipe 6 having a drain pump P3 is connected to the outlet 32.

  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 7 </ b> A outside the exterior case 5. 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 attachment to the adapter 90 of the bathtub 9 is provided at the end of the bath pipe 7A, and the end 6a of the drain pipe 6 is drawn out from a hole 71a provided in the joint 71. . The terminal end 6a of the drain pipe 6 is arranged so that the drain can be discharged, for example, to a bathtub hot water discharge port (not shown) provided on the floor of the bathroom.

  The control part 4 is comprised using the microcomputer etc., and performs operation control of each part of the hot water apparatus WH. In addition, in the present embodiment, as described below, the control unit 4 determines whether or not there is an abnormality such as breakage in the drain pipe 6.

  First, at least a portion of the drain pipe 6 closer to the terminal end 6a than the joint 60 for attachment to the exterior case 5 is configured using a non-conductive tube 61 such as a synthetic resin tube. Further, a first conductor portion 62 is provided in a substantially full length region inside the tube 61. The first conductor portion 62 is provided by inserting a metal wire into the tube 61 (see also FIG. 3), and one end of the first conductor portion 62 is for draining in the outer case 5. It is drawn out of the pipe 6 and connected to the terminal 63. On the other hand, the bath pipe 7A (including the mounting joint 70 and the like) is made of, for example, copper having conductivity. The bath pipe 7A itself is used as the second conductor portion, and the terminal 73 located in the outer case 5 is provided. It is set as the provided structure.

  The control unit 4 includes a power supply circuit (not shown) connected to the pair of terminals 63 and 73 via the electric wiring La, and applies a voltage to the first conductor unit 62 and the bath pipe 7A. Is possible. When the drain pipe 6 is in a normal attachment state without damage, no electrical continuity is generated between the first conductor portion 62 and the bath pipe 7A. On the other hand, as shown in FIG. 4, in the double pipe structure D, the drain pipe 6 is damaged and a hole 69 is opened, so that the drain region 6a and the outer region 68b of the drain tube 6 are drained or hot water. Is in a state where the first conductor 62 and the bath pipe 7A (second conductor) are electrically connected. The control unit 4 can detect such an electrical continuity state, and is configured to determine that the drain pipe 6 is damaged or otherwise abnormal when such a detection is made. Yes. The hot water device WH includes a remote controller (not shown) including a display screen and an alarm. When the control unit 4 determines that there is the abnormality, the control unit 4 displays the fact on the display screen. Alternatively, a process for notifying the user by generating an alarm sound or the like is performed. Further, when the abnormality occurs, the operation of the hot water device WH can be forcibly stopped by the control of the control unit 4.

  In the drawing, the terminal 73 is provided in the bath pipe 7A. However, instead of such a configuration, the following configuration may be employed. That is, the metal outer case 5 is set to the ground potential, and the bath pipe 7A is set to the ground potential electrically connected to the outer case 5. On the other hand, the first conductor portion 62 and its terminal 63 are electrically insulated from the outer case 5 by using the insulating member 50 or the like. According to such a configuration, it is not necessary to provide the terminal 73 directly on the bath pipe 7A, and it is only necessary to provide the terminal 73 at an appropriate position on the exterior case 5, and the electrical wiring distance for the ground can be shortened.

  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 reservoir 3 is sent to the terminal end 6a side of the drain pipe 6, and is discharged to the bathroom drain and discarded. Overflow water from the heating hot water tank 85 is also discharged to the bathroom drain together 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, without adopting such a double pipe structure, 2 Compared with the case where the drain pipes 6 are arranged outside the book 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 a bathroom so that above-mentioned piping may be drawn in into a bathroom from the outdoors can also be made small.

  As shown in FIGS. 2 and 3, when the drain pipe 6 is not damaged in the double pipe structure D, the first conductor 62 and the bath pipe 7A (second conductor) Part) is in an electrically insulated state. On the other hand, as shown in FIG. 4, the drain pipe 6 is damaged by some reason and a hole 69 is opened, so that drain or hot water flows between the inner region 68 a and the outer region 68 b of the drain pipe 6. If it will be in the state which distribute | circulates, it will be in the state which the 1st conductor part 62 and 7 A of bath piping were electrically connected. Then, the control unit 4 detects this and determines that an abnormality has occurred in the drain pipe 6. As a result of this determination, a predetermined notification operation or operation stop of the hot water device WH is performed. Therefore, when an abnormality occurs in the drain pipe 6, the user can accurately detect that fact and take appropriate countermeasures. If the drain pipe 6 is damaged, if it is left unattended, there is a concern that the drain in the drain pipe 6 flows into the bathtub 9 through the bath pipe 7A. According to the hot water device WH, it is possible to eliminate or reduce such a concern.

  5 to 10 show other embodiments of the present invention. In these drawings, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the configuration shown in FIG. 5 (a), a conductive material film (film by coating, plating, vapor deposition, etc.) is formed on the inner peripheral surface of the tube 61 constituting the drain pipe 6, and this portion is the first. 1 conductor portion 62a. Even if it is such a structure, the effect | action similar to the case where the 1st conductor part 62 of above-described embodiment is provided is acquired. Although it is not necessary to provide the first conductor portion 62a on the entire circumference of the inner surface of the tube 61, if the first conductor portion 62a is provided on the entire circumference, an effect of reinforcing the tube 61 and making it difficult to break can be obtained.

  In the configuration shown in FIG. 5B, a second conductor portion 72 using a metal wire is provided in the outer region 68b of the drain pipe 6, and the first and second conductor portions 62, A voltage is applied to each of 72. According to such a configuration, the bath pipe 7A can be made of a nonconductive material such as a synthetic resin. It goes without saying that each of the first and second conductor portions 62 and 72 can be formed of a conductive material film instead of using a metal wire.

  Although not shown in the drawings, in the present invention, the inner region 68a and the outer region 68b of the drain pipe 6 are not used without using the first and second conductor portions extending along the drain pipe 6. It is also possible to determine whether the electrical insulation state is maintained. That is, an electrode provided so as to be in contact with the drain flowing in the drain pipe 6 (this electrode may be provided in the drain storage portion) and hot water flowing in the bath pipe 7A. When the drain pipe 6 is broken and the drain in the drain pipe 6 and the hot water in the bath pipe 7A are in mixed contact with each other, the electrode between the pair of electrodes described above is provided. May be conducted and detected by the control unit 4.

  In the embodiment shown in FIG. 6, the abnormality of the drain pipe 6 can be detected based on the change in the water level of the drain reservoir 3. More specifically, in this embodiment, the water level detector 33 is provided with an electrode 33d for detecting a water level (intermediate water level) LM that is higher than the low water level LL by a predetermined amount in addition to the electrodes 33a to 33c. ing. Further, an on-off valve V2 is provided between the discharge port 22 of the neutralizer 2 and the inlet 30 of the drain reservoir 3 so that the inflow of drain from the neutralizer 2 to the drain reservoir 3 is appropriately performed. It is configured to prevent it. The control unit 4 is configured to determine whether or not there is an abnormality in the drain pipe 6 according to an operation procedure as shown in the flowchart of FIG. 7, and will be described below.

  First, when a hot water filling operation or bath reheating operation is performed on the bathtub 9 (S1: YES), the control unit 4 closes the on-off valve V2 and starts a drain in the drain storage unit 3 before starting this operation. Is prevented from flowing in (S2). Next, the control unit 4 determines whether or not the water level of the drain storage unit 3 is the low water level LL. If the water level is higher than that, the control unit 4 drives the drain pump P3 and sets the drain to the low water level LL. (S3: NO, S8). The control unit 4 starts a hot water filling operation or a bath chasing operation after the setting state as described above is completed (S4).

  In any of the above-described hot water filling operation or bath reheating operation, hot water flows into the bath pipe 7A at a predetermined pressure by driving the pump P1 shown in FIG. If the pipe 6 is damaged, the hot water in the bath pipe 7A flows into the drain pipe 6 and the water level of the drain reservoir 3 rises. When such a phenomenon occurs and the water level of the drain reservoir 3 reaches a predetermined intermediate water level LM, the controller 4 determines that there is an abnormality such as breakage in the drain pipe 6 at that time, and performs a notification operation. The process is executed (S5: YES, S6, S7).

  On the other hand, when the drain water level does not increase and the drain water level does not reach the intermediate water level LM during the hot water filling operation or the bath reheating operation, the control unit 4 may cause damage to the drain pipe 6. It is determined that there is no abnormality (S5: NO, S9). In this case, the on-off valve V2 is then opened, and the drain inflow from the neutralizer 2 to the drain reservoir 3 is allowed (S10).

  As described above, according to the present embodiment, whether there is an abnormality such as breakage in the drain pipe 6 based on whether or not the drain water level rises when the hot water filling operation or the bath reheating operation is performed. It is possible to accurately determine whether or not. In particular, when determining whether or not there is an abnormality, the on-off valve V2 is closed and the drain is prevented from newly flowing into the drain reservoir 3 from the neutralizer 2, so that the drain pipe 6 is damaged. It is possible to accurately detect the rise of the drain water level due to the occurrence of the abnormality, and to determine whether or not there is an abnormality. Preferably, when making the above determination, water supply to the heating / hot water tank 85 is not performed, and overflow water of the heating / hot water tank 85 is also prevented from flowing into the drain storage unit 3. Is done.

  In the embodiment shown in FIG. 8, a water level sensor Sa that can continuously detect a change in the water level based on the water pressure or the like is used as the water level detection means provided in the drain reservoir 3. Of course, separately from the water level sensor Sa, a water level detecting means of the type using the electrodes shown in FIGS. 1 and 2 may be provided. The control unit 4 in the present embodiment is based on whether or not there is an instantaneous rise in the water level of the drain storage unit 3 in the initial stage when a hot water filling operation or a bath reheating operation is performed on the bathtub 9. Thus, it is configured to determine whether or not there is an abnormality in the drain pipe 6, and the details thereof will be described below.

  First, when the drain pipe 6 is damaged in the double pipe structure D, when the hot water starts to flow through the bath pipe 7A, the pressure of the hot water acts instantaneously and greatly in the drain pipe 6. Phenomenon occurs. That is, a surge pressure affected by the pressure of hot water is generated in the drain pipe 6. Then, due to this surge pressure, the water level in the drain reservoir 3 rises instantaneously. In the curve L1 shown in FIG. 9, there is a portion n1 where the water level rises instantaneously, but this phenomenon occurs when the drain pipe 6 is damaged. In the curve L1, the water level rises with time, because the drain flows from the neutralizer 2 into the drain reservoir 3. On the other hand, when the drain pipe 6 is normal without breakage, for example, a curve L2 shown in FIG. 9 is obtained, and the phenomenon indicated by the symbol n1 of the curve L1 is not observed.

  Based on the principle as described above, the control unit 4 sets the drain pipe 6 to the drain pipe 6 when the water level of the drain storage unit 3 temporarily rises by a predetermined amount or more in the initial stage of the hot water filling operation or the bath reheating operation. It is configured to determine that there is an abnormality and to determine that there is no abnormality if not. Even with such a configuration, it is possible to accurately determine whether or not the drain pipe 6 is abnormal. According to the present embodiment, in order to detect instantaneous fluctuations in the water level of the drain reservoir 3, unlike the embodiments shown in FIGS. 6 and 7, the on / off valve V2 is used to remove the water level from the neutralizer 2. There is an advantage that it is not necessary to temporarily stop the inflow of the drain into the drain reservoir 3.

  In the embodiment shown in FIG. 10, the drain reservoir 3 and the neutralizer 2 are integrally formed. More specifically, 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 is a region that is filled with the neutralizing agent 21 ( The drain neutralized by passing through the portion of the neutralization tank is configured to flow into the drain reservoir 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.

  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.

  In the embodiment described above, the double pipe structure D is configured such that the drain pipe 6 is inserted into the bath pipe 7A (bath pipe), but unlike this, the bath pipe 7B (bath return pipe) ), The drain pipe 6 may be inserted. However, in the case of such a configuration, the suction pressure by the pump P2 reaches the drain pipe 6 when the bath is replenished in a state where the drain pipe 6 is damaged. For this reason, unlike the embodiments shown in FIGS. 6 to 9, the water level of the drain reservoir 3 is lowered, and the controller 4 detects that there is an abnormality when detecting such a drop in the water level. Judgment will be made.

  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. Of course, 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. FIG. 3 is a sectional view taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view showing a state where a drain pipe is damaged in the structure shown in FIG. 3. (A), (b) is principal part sectional drawing which shows the other example of this invention. It is principal part explanatory drawing which shows the other example of this invention. It is a flowchart which shows an example of the operation processing procedure of the control part shown in FIG. It is principal part explanatory drawing which shows the other example of this invention. It is a figure which shows the example of the change of the water level of the drain storage part in the structure shown in FIG. It is a principal part schematic diagram 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 9 Bathtub 7A, 7B Bath piping 13a, 13b Heat exchangers 14a, 14b Heat exchanger 33 Water level detector (water level detecting means)
61 Non-conductive tubes 62, 62a First conductor portion 68a Drain piping inner region 68b Drain piping outer region 72 Second conductor portion Sa Water level sensor (water level detecting means)

Claims (5)

A heat exchanger for performing hot water heating by recovering heat from the heating medium;
A drain pipe for guiding the drain generated by the heat recovery 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 has a double pipe structure part inserted into the bath pipe,
The double pipe structure is configured such that the inside and outside of the drain pipe are electrically insulated,
It is monitored whether or not the electrical insulation state inside and outside the drain pipe in the double pipe structure is maintained, and when the electrical insulation state is not maintained, the drain pipe The hot water apparatus is further provided with a judging means for judging that there is damage or other abnormality. The hot water device according to claim 1,
The drain pipe is configured using a non-conductive tube, and a first conductor portion extending in the longitudinal direction of the tube is provided inside the tube,
The bath pipe is made of a conductive member as a second conductor portion, or extends in the longitudinal direction of the bath pipe to the outside area of the drain pipe in the bath pipe. A second conductor portion is provided,
When the determination means applies a voltage to the first and second conductor portions and causes electrical continuity between the first and second conductor portions, the drain pipe has an abnormality. A hot water device configured to determine. A heat exchanger for performing hot water heating by recovering heat from the heating medium;
A drain pipe for guiding the drain generated by the heat recovery 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:
A double pipe structure in which the drain pipe is inserted into the bath pipe;
A drain reservoir located upstream from the double-pipe structure and connected to the drain pipe; and
A water level detection means capable of detecting a drain water level or a change in the water level in the drain reservoir,
When hot water was circulated in the bath pipe, it was determined whether or not the drain water level of the drain storage part was changed with the hot water flow, and the drain water level was changed with the hot water flow. Determining means for determining that there is damage or other abnormality in the drain piping,
A hot water apparatus, further comprising: The hot water device according to claim 3,
An opening / closing valve provided on the upstream side of the drain reservoir,
When the determination means determines whether the drain water level of the drain pipe has changed as hot water flows through the bath pipe, the open / close valve is closed and the drain storage section A water heater configured to prevent the drain from flowing in. The hot water device according to claim 3 or 4,
The determination means is configured to detect an abnormality in the drain pipe when a surge phenomenon occurs in which the water level in the drain storage section temporarily rises or falls above a predetermined width at an initial stage when hot water circulation is started in the bath pipe. A hot water device that is configured to determine that there is.

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