JP6470197B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply device, which is suitable for vaporizing drain while suppressing reduction in energy efficiency.

  In a hot water supply apparatus, a latent heat heat exchanger that performs heat exchange using latent heat of exhaust gas obtained by heating water may be provided. In this case, acidic drainage is generated in the latent heat exchanger. For this reason, generally, the drain is neutralized by a neutralizer, and the drain after neutralization is drained from the drainage facility.

  In order to eliminate this drainage facility, a vaporizer is attached to the hot water supply device so that the combustion gas from the combustion gas exhaust port of the hot water supply device can be introduced, and the drain generated by the latent heat exchanger in the hot water supply device is removed. A vaporization processing system that is guided to a vaporizer has been proposed (see, for example, Patent Document 1).

  In this vaporization processing system, the humidity is estimated from the water level change of the drain per unit time obtained from the water level sensor in the vaporizer, and the total amount of drain generation is vaporized within the unit period based on the humidity. The amount of air blown to the vaporization filter in the vaporizer is adjusted.

JP 2010-197010 A

  However, in the vaporization processing system of Patent Document 1, one of the air supply / exhaust ports is provided on one side of the body side surface of the vaporizer, and the other of the air supply / exhaust ports is provided on the other side of the body side surface of the vaporizer. The wind blowing across the vaporizer flows through the vaporizer. For this reason, the amount of air flowing in the vaporizer fluctuates regardless of the control of the blower fan due to the wind blowing toward the vaporizer, and is used to estimate the humidity using the difference in increase or decrease of the drain water level in the vaporizer. Affect. As a result, there is a tendency that accurate humidity cannot be obtained based on the water level sensor.

  Then, an object of this invention is to provide the hot water supply apparatus which can acquire exact humidity based on a water level sensor.

  In order to solve this problem, a hot water supply apparatus of the present invention includes a case main body having an accommodation space, a cover panel attached to the case main body and covering the accommodation space, a sensible heat exchanger accommodated in the accommodation space, and A vaporizing cloth for vaporizing moisture in the drain generated in the latent heat exchanger, the vaporizing cloth supplied to the vaporizing cloth in the cover panel. A drain vaporizing air supply port for supplying air from the outside of the accommodating space, and a drain vaporizing exhaust port for discharging the drain vaporizing air and moisture in the vaporized drain to the outside of the accommodating space Both are provided.

As described above, in the hot water supply apparatus of the present invention, both the drain vaporization inlet and the drain vaporization outlet are provided to the cover panel covering the accommodation space in which the sensible heat exchanger and the latent heat exchanger are accommodated. Is provided.
For this reason, compared with the case where one of the drain vapor supply port and the drain vapor exhaust port is provided in the cover panel and the other is provided other than the cover panel as in the vaporization device of Patent Document 1, the hot water supply device The wind pressure received at the drain vaporization inlet from the outside approximates the wind pressure received at the drain vaporization outlet from the outside of the hot water supply apparatus.
Therefore, the wind blown toward the hot water supply device enters and cancels out both of the drain vaporization supply port and the drain vaporization exhaust port, and the flow of the drain vaporization air due to the wind is not generated. As a result, the vaporization of the drain due to the wind blowing toward the hot water supply apparatus is greatly reduced, and the humidity change width estimated from the drain vaporization amount is substantially equal.
Thus, a hot water supply apparatus that can acquire accurate humidity based on the water level sensor is provided.

It is a figure which shows the mode of the external appearance of the hot water supply apparatus in this embodiment. It is a figure which shows the mode of the cross section of a hot-water supply apparatus. It is a figure which shows the structure of a drain vaporization process part. It is a figure which shows the flow path in a storage case. It is a flowchart which shows the procedure of a flow-path switching process. It is a flowchart which shows the procedure of a drain vaporization process. It is a figure which shows the example of installation of the air inlet for drain vaporization in other embodiment. It is a figure which shows the structural example of the combustion gas flow path in other embodiment. It is a figure where it uses for description of a wind pressure zone. It is a figure where it uses for description of a wind pressure zone. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure where it uses for description of a pressure receiving piece. It is a figure which shows a mode when a wind blows from the front with respect to the hot water supply apparatus installed in PS. It is a figure which shows a mode when a wind blows from the front with respect to the hot-water supply apparatus installed in a wall.

First, the considerations made by the inventor of the present application that led to the optimal embodiment of the present invention will be briefly described.
1. Since the drain contains nitric acid (HNO ₃ ), if the drain is sprayed without being neutralized (eg, released in a liquid state such as ultrasonic vaporization), the nitric acid will also scatter and the surroundings of the hot water supply device will rust. The inventor has found a problem that the Furthermore, when spraying after neutralizing the drain, the present inventors found that the neutralizing agent splatters this time, and a powdery material adheres around the hot water supply device and becomes dirty.
Therefore, the present inventor did not spray the drain but experimented by creating a vaporizer that vaporizes the moisture in the drain. As a result, the vaporized drain does not contain nitric acid and the surroundings of the vaporizer rust. There was no. Further, when vaporizing after neutralizing the drain, the moisture in the drain did not contain a neutralizing agent component, and the surroundings of the vaporizer were not soiled.
2. However, after a good experimental result was obtained, the experimental device was left for a while, and the surrounding area where the vaporizer that vaporized drain (without vaporizing) was used without using a neutralizing agent was rusted. The inventor has found that this is the case.
3. The inventor of the present application does not substantially contain a nitric acid component in the gas emitted from the vaporizer during the experiment of combustion → drain generation → vaporization → combustion → drain generation → vaporization, and the experiment is completed. It was hypothesized that the nitric acid component was contained in the gas leaked from the vaporizer when it was left unattended, which caused the surrounding area to rust.
4). Therefore, when drain was put into a beaker and heated to remove the moisture, white crystals temporarily disappeared after the white crystals temporarily remained at the bottom of the beaker when the beaker ran out of water. This white crystal disappeared in the same way even if it was left alone in the window without heating. The inventor of the present application sublimates after the nitric acid (HNO ₃ ) component in the drain is changed to dinitrogen pentoxide (N ₂ O ₅ : commonly known anhydrous nitric acid having hygroscopicity), which is a white crystal at the time when water is lost, It was estimated that this sublimated corrosive component drifted around the vaporizer at high concentration due to the light wind (light air or less) blown around the vaporizer, which caused rust.
5. The inventor of the present application stops the air flow by stopping the blowing if the water level in which the vaporizing filter in the vaporizing device falls below the predetermined water level, and if the water level drops due to non-use for a long period of time, add the tap water to adjust the appropriate water level. If you control it, you can prevent the above-mentioned corrosion, but for example, when you are not using it for a long time in a villa in a resort area, you may stop electricity and water, and you will not be able to control the water level by adding tap water. Abandoned adoption.
6). Therefore, in the environment where the wind is blowing (especially in the case of a light wind), focusing on the point that the surroundings can be prevented from rusting by making the structure in which the air does not easily pass through the vaporizer (mechanical structure), the present invention has been achieved. .
7). In addition, paying attention to the fact that the hot water usage time is from the evening to the night, bathing hot water usage time from the evening to the night, the vaporizer drive time zone may be a bedtime from late night to the next morning early morning Since it is high, it has been found that a method of sucking out air containing drained vapor from the vaporizing cloth, that is, using the suction pressure results in lower noise, and is incorporated into the vaporizer of the present invention.
If the vaporizing cloth is formed in a substantially cylindrical shape, drain is immersed in the lower end, and air is sucked out from the inside of the vaporizing cloth 53 at the upper end, the air is sucked in from the entire circumference of the vaporizing cloth. Even if it adheres to the surface, air flows while avoiding the foreign matter, so that wind noise generated by the foreign matter is reduced. That is, it is no longer necessary to reduce the ability to prevent wind noise from occurring at night. Furthermore, even if the capacity is maintained for a long period of time (diameter), the pressure loss amount is kept small (a situation in which foreign matter enters the vaporizing cloth can be avoided), so a decrease in the humidification amount can be avoided. .

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating an appearance of a hot water supply apparatus according to the present embodiment. As shown in FIG. 1, the hot water supply device 1 of the present embodiment has a housing case 10. The housing case 10 includes a case body 11 and a cover panel 12.

  The case main body 11 has a rear wall 11A that is the rear side of the case main body 11 and a frame wall 11B that is connected to an end of the rear wall 11A. The rear wall 11A and the frame wall 11B provide a storage space. It is formed. 11 A of back walls are the bottom parts which comprise accommodation space, and are opposed to walls, such as the outer wall of the house in which a case main body should be installed in the case of the attachment form called a wall hanging installation (at the time of the attachment form called PS installation, a flange It faces the wall such as the PS installation frame of the apartment where the FR is to be installed (see Fig. 4 for details).

  The cover panel 12 is a front panel that is disposed on the front side opposite to the rear wall 11 </ b> A of the case body 11, covers the accommodation space of the case body 11, and is detachably attached to the case body 11. In the present embodiment, the cover panel 12 is a double of a box-shaped outer panel 12A composed of a frame wall and a front wall, and a plate-shaped inner panel 12B connected to an end on the back side of the frame wall. (See FIG. 11A for details). The cover panel 12 is formed with a space surrounded by the frame wall of the outer panel and the inner surface of the front wall and the front surface of the inner panel 12B, and the inner panel 12B projects outward from the outer surface of the frame wall of the outer panel. A flange FR is formed.

  The cover panel 12 has a combustion air inlet 13 for supplying combustion air for obtaining heat recovered in the heat exchanger accommodated in the accommodation space of the case body 11 from the outside of the accommodation space. Provided. In the present embodiment, the combustion air inlets 13 are respectively provided in the left and right frame walls facing each other among the frame walls of the box-shaped outer panel 12A, and the left and right combustion air inlets 13 are the front surfaces of the inner panel 12B. And a space surrounded by the inner surface of the box-shaped outer panel. The outer shape of the combustion air inlet 13 is elliptical, and the number of the combustion air inlets 13 is plural.

  The cover panel 12 also has a drain vaporization for supplying drain vaporization air for vaporizing drain generated in the latent heat exchanger 26 accommodated in the accommodating space of the case body 11 from the outside of the accommodating space. An air supply port 14 is provided. In the present embodiment, a drain vaporizing air supply port 14 is provided at the lower end portion of the front wall of the outer panel 12 </ b> A of the cover panel 12. The inner side panel 12 </ b> B facing the drain vaporization inlet 14 is also provided with a drain vaporization inlet 14. Of the space surrounded by the frame wall and the inner surface of the front wall of the outer panel 12A and the front surface of the inner panel 12B, the drain vaporization inlet 14 of the outer panel 12A and the drain vaporization inlet 14 of the inner panel 12B Is separated by a partition plate PP1 provided between the outer panel 12A and the inner panel 12B (see FIG. 11A for details). The external shape of the drain vaporization inlet 14 is circular, and the number of the drain vaporization inlets 14 is plural.

  Further, the cover panel 12 has drain vaporization for discharging the drain vaporization air supplied from the drain vaporization inlet 14 and the drain vaporized by the drain vaporization air to the outside of the housing space of the case body 11. An exhaust port 15 is provided. In the present embodiment, the drain vaporization exhaust port 15 is provided at the upper end portion of the front wall of the outer panel 12 </ b> A of the cover panel 12. There is no inner panel 12B facing the drain vaporizing exhaust port 15. That is, the upper end portion of the cover panel 12 is not doubled, but only the configuration of the outer panel 12A and the flange FR (see FIG. 11A for details). The external shape of the drain vaporization exhaust port 15 is elliptical, and the number of the drain vaporization exhaust ports 15 is one.

  The drain vaporization exhaust port 15 is also a combustion exhaust port for discharging the combustion air supplied from the combustion air supply port 13 to the outside of the housing space of the case body 11, and the combustion exhaust port From the outlet (exhaust from the outlet 22 described later) and the gas drain from the outlet 32 are merged and discharged. The exhaust flow from the combustion exhaust port is narrowed just before this merging, the exhaust flow velocity is accelerated, and the accelerated exhaust and the gas drain are crossed loosely without killing the accelerated speed. Mixed. Gaseous drain is at room temperature (although it has a lower heat of vaporization) and is heavier than exhaust. When this heavy gas drain is discharged along the lower part of the exhaust (substantially in parallel), it is separated by a specific gravity difference, and even if the exhaust proceeds far, the gas drain is separated and dropped in the middle. Therefore, in the present application, the exhaust flow velocity is accelerated and the exhaust and the gas drain are intersected loosely so that the two flows are not separated in the middle (the two flows are integrated and diffused far away). (Far diffusion)). In addition, when such a structure is used, the gas drain is sucked (incorporated suction) with the force of exhaust, and more gas drain than the amount of flow created by the vaporizing fan 56 is discharged during non-combustion. .

  Drawing 2 is a figure showing the situation of the section of a hot-water supply device. As shown in FIG. 2, a combustion case 20 and a drain vaporization case 30 are provided in the housing space of the case body 11. In the present embodiment, the combustion case 20 is provided on the rear wall 11A side that is the rear side of the case main body 11 in the housing space of the case main body 11, and the drain vaporizing case 30 is on the front side opposite to the rear wall 11A. Is provided. Of the accommodation space of the case body 11, the combustion case 20 may be provided on the right side, and the drain vaporization case 30 on the left side.

  An inflow port 21 is provided at the bottom of the combustion case 20, and an exhaust port for exhausting the combustion gas exiting the latent heat exchanger 26 in the front direction of the cover panel 12 is provided on the upper side of the combustion case 20. An outlet 22 is provided. The inflow port 21 communicates with the combustion air inlet 13 of the housing case 10, and is an opening for allowing the combustion air supplied from the combustion air inlet 13 into the housing case 10 to flow into the combustion case 20. It is. The outlet 22 is an opening through which the combustion air that has flowed into the combustion case 20 flows out of the combustion case 20, and communicates with the drain vaporization exhaust port 15 of the storage case 10.

  The combustion fan 23 is disposed directly below the inlet 21 outside the combustion case 20 and is attached to the outer wall of the combustion case 20. The combustion fan 23 takes combustion air into the housing case 10 from the outside of the housing case 10 through the combustion air supply port 13, and burns the taken combustion air from the inlet 21 of the combustion case 20. Send to the inside of the case 20. The combustion fan 23 is a high-performance fan that can be combusted even when strong winds (Strong Breeze or higher) such as typhoon are blowing. For example, a high-pressure type low-pressure fan such as a sirocco fan or a turbo fan. An efficiency fan is applied. A strong wind such as a typhoon blows in a wavy state when a strong wind (strong breeze or higher) blows or weakens instantaneously. The combustion fan 23 is a high-pressure fan so as not to misfire when the strong wind blows instantaneously. As a result, a high pressure other than when a strong wind is blown instantaneously can be used to suck the gas drain. When a strong wind is blown instantaneously, a part of the exhaust gas exiting from the outlet 22 and the wind flowing in from the drain vaporizing exhaust port 15 may be mixed and may flow backward through the outlet 32. The backflow air passes through the vaporizing cloth 53 and is discharged from the drain vaporizing air supply port 14 to the outside of the housing case 10. At the time of this reverse flow, the exhaust (for example, humidity 100%) is mixed with the wind flowing from the drain vaporization exhaust port 15 (the humidity is lowered), so that drain vaporization (backflow vaporization) is performed when passing through the vaporization cloth 53. That is, the combustion fan 23 and the vaporizing fan 56 are separated (one is a high-pressure type and the other is a low-pressure type), and even when the vaporizing fan 56 is blown with the same air volume, the low-pressure type is less expensive than the high-pressure type. In addition, the outlet 22 and the outlet 32 are joined to form the drain vaporization exhaust port 15, so that normal vaporization is normally performed, and reverse flow vaporization is performed when a strong wind blows instantaneously. Thus, drain vaporization can be performed efficiently at low cost. It should be noted that the combustion fan 23 and the vaporizing fan 56 are separately provided, and the air supply side is individually provided in the cover panel 12 as the combustion air supply port 13 and the drain vaporization air supply port 14, so that the combustion fan 23 is provided. And the vaporizing fan 56 are prevented from interfering with each other.

  Inside the combustion case 20, a burner 24, a sensible heat exchanger 25, a latent heat exchanger 26, and a drain receiver 27 are provided. The burner 24 is provided in the lower part in the combustion case 20 and burns the gas supplied from the gas pipe 41. The gas pipe 41 is provided in a state of penetrating predetermined portions of the case body 11 and the combustion case 20, and a gas on / off valve 42 and a gas proportional valve 43 are provided at the predetermined portion of the gas pipe 41. Note that the hole portions of the case body 11 and the combustion case 20 through which the gas pipe 41 passes are sealed.

  The sensible heat exchanger 25 is provided on the downstream side of the burner 24 on the flow path of the combustion air sent from the combustion fan 23 into the combustion case 20, and includes a heat transfer tube 25A and its heat transfer tube 25A. In order to improve the heat transfer property of the heat transfer tube 25A, fins 25B are provided on the outer surface of the heat transfer tube 25A. The sensible heat exchanger 25 mainly recovers sensible heat from the combustion air heated by the combustion in the burner 24 and heats the water in the heat transfer tube 25A.

  An output end of a heat transfer tube 26A described later is connected to the input end of the heat transfer tube 25A. A water supply pipe 44 described later is provided in a state of penetrating predetermined portions of the case body 11 and the combustion case 20, and a water supply flow rate sensor 45 is provided at the predetermined portion of the water supply pipe 44. Note that the hole portions of the case body 11 and the combustion case 20 through which the water supply pipe 44 passes are sealed.

  The latent heat exchanger 26 is provided on the downstream side of the sensible heat exchanger 25 on the flow path of the combustion air sent from the combustion fan 23 into the combustion case 20, and includes a heat transfer tube 26A, And fins 26B provided on the outer surface of the heat transfer tube 26A. The latent heat exchanger 26 mainly collects the latent heat of the exhaust generated by the heating in the sensible heat exchanger 25 and heats the water in the heat transfer tube 26A. Note that the fins 26B are not necessarily required. The combustion exhaust gas of 180 to 250 ° C. flows into the latent heat exchanger 26, and the combustion exhaust gas of 50 to 70 ° C. and humidity 100% flows out.

  The output end of the heat transfer tube 26A is connected to the input end of the heat transfer tube 25A in the sensible heat exchanger 25 via a connection pipe (not shown), and the hot water supply pipe 46 is connected to the output end of the heat transfer tube 25A. The hot water supply pipe 46 is provided in a state of penetrating through predetermined portions of the case body 11 and the combustion case 20, and a hot water supply thermistor 47 is provided at the predetermined portion of the hot water supply pipe 46. Note that the hole portions of the case main body 11 and the combustion case 20 through which the hot water supply pipe 46 passes are sealed.

  The water supply pipe 44 of this embodiment is branched at a portion upstream of the latent heat exchanger 26, and one water supply pipe 44A branched at the branch portion is an input end of the heat transfer tube 26A in the latent heat exchanger 26. Connected to. Further, the other water supply pipe 44B branched at the branch portion of the water supply pipe 44 is connected to the output end of the heat transfer pipe 26A in the latent heat exchanger 26 with respect to the input end of the heat transfer pipe 25A in the sensible heat exchanger 25. It is connected with a connecting pipe (not shown).

  At the branch portion of the water supply pipe 44, a first water channel for flowing water supplied through the water supply pipe 44 to the sensible heat exchanger 25 through the latent heat exchanger 26, and the latent heat exchanger 26. Is provided with a switching valve 49 for switching to the second water channel that flows to the sensible heat exchanger 25 without passing through the sensible heat exchanger 25. That is, when the switching valve 49 is switched to the first water channel, the water supplied from the water supply pipe 44 is supplied from the branch portion of the water supply pipe 44 to the latent heat exchanger 26 via the water supply pipe 44A. Water is supplied. On the other hand, when the switching valve 49 is switched to the second water channel, most of the water supplied from the water supply pipe 44 exchanges sensible heat from the branch portion of the water supply pipe 44 via the water supply pipe 44B. Water is supplied to the vessel 25. As described above, the switching valve 49 has a structure in which only a part of the switching valve 49 passes through the first water channel even when switched to the second water channel.

Here, the switching valve 49 will be described in detail. The controller 60 stores the distribution ratio between the first water channel and the second water channel according to the amount of water (measured value of the feed water flow rate sensor 45) and the thermal efficiency according to the water temperature. The feed water temperature is determined by the thermal efficiency (for example, 96 [%]) and the combustion amount (opening of the gas proportional valve 43) when passing through the first water channel that flows to the sensible heat exchanger 25 through the latent heat exchanger 26 in a stable manner last time. Degree (for example, OUTPUT 25000 [kal / h]), water supply flow rate sensor 45 (for example, 16 [liter / min]), and hot water supply thermistor 47 (for example, 40 [° C.]) (for example, water supply temperature 15 [° C.] = 40 [ [° C.] − (25000 [kal / h] × 96 [%] ÷ 60 [min] ÷ 16 [liter / min])), or store the previous water supply temperature for use as the current water supply temperature, or Measured with a water thermistor that is not used. The total amount of water supplied through the water supply pipe 44 when the water supply temperature is 15 [° C.] flows to the sensible heat exchanger 25 via the latent heat exchanger 26, and the thermal efficiency when the first water channel passes through ( Compared to 96 [%], for example, the thermal efficiency (for example, 81 [%]) when passing through the second water channel is low, and the thermal efficiency when passing most of the water through the second water channel is also low. (For example, 91 [%]).
The switching valve 49 is controlled by the controller 60 so as to avoid boiling (vibration noise, etc.) in the latent heat exchanger 26 by performing the following calculation based on the combustion amount, water amount, feed water temperature, and stored thermal efficiency.
Distribution ratio between the first water channel and the second water channel (for example, when the total amount is ratio “32”, the second water channel is ratio “31”, and the first water channel is ratio “1”, 1: 31), the feed water temperature (for example, 15 [° C.]), the amount of water (for example, 16 [liter / min]), the stored thermal efficiency (for example, the thermal efficiency of 81 [%] when the entire amount passes through the second water channel, The temperature of the first water channel can be obtained from the heat efficiency (91 [%] when most of the water amount is passed through the water channel) and the combustion amount (for example, 25000 [kal / h]) (for example, 98.3 [° C.]). = 32 × (15 [° C.] + (25000 [kal / h] × (91 [%] − 81 [%]) ÷ 60 [min] ÷ 16 [liter / min])) − 31 × 15 [° C.] = 32 × 17.6 [° C.] − 31 × 15 [° C.]), the first water channel so that the water flowing through the first water channel does not boil (for example, 102 ° C. or less) 2 is obtained, and the switching valve 49 is controlled by the controller 60 (in the feed control, the first water channel is set to 0.5 [liter / min]). One of the two stored thermal efficiencies may be obtained by calculation using the tapping temperature (measured value of the hot water supply thermistor 47. For example, 38.7 [° C.]) (for example, 91 [%] = (38.7 [ [° C.] − 15 [° C.]) × 16 [liter / min]) × 60 [min] ÷ 25000 [kal / h]). In other words, the distribution ratio may be feedback-controlled while controlling the switching valve 49 so that the water flowing through the first water channel does not boil from the combustion amount, water amount, feed water temperature, and tapping temperature.
Even if it switches to a 2nd water channel, as a structure where a part passes a 1st water channel, you may use the switching valve 49 which performs calculation as mentioned above and performs opening degree control, for example, For example, when the water channel is switched to 2, a fixed bypass structure in which, for example, a water amount of about 6% (a level that does not boil) passes through the first water channel, as in a distribution ratio of 1:15, for example.

  The drain receiver 27 receives the drain generated by the latent heat exchanger 26 and guides the drain to the drain vaporizing case 30. Drain is a liquid obtained as a result of a phase change of gas such as water vapor contained in the combustion gas, and in the combustion gas such as NOx and SOx (for example, SOx generated by combustion of odorant tertiary butyl mercaptan: C4H10S) It is acidic because the ingredients contained in it dissolve. The drain receiving portion 27 in the present embodiment is inclined so as to guide the drain received from the latent heat exchanger 26 downward, and is provided in a state of penetrating predetermined portions of the combustion case 20 and the drain vaporizing case 30. In addition, the hole part of the combustion case 20 and the drain vaporization case 30 which the drain receiving part 27 penetrates is sealed.

  An inflow port 31 is provided at the side of the drain vaporization case 30, and an outflow port 32 is provided at the upper end of the drain vaporization case 30. The inflow port 31 is an opening through which the drain vaporization air supplied from the drain vaporization supply port 14 to the inside of the housing case 10 flows into the drain vaporization case 30, and is opposed to the drain vaporization supply port 14. Communicated. The outlet 32 is an opening through which the drain vaporizing air that has flowed into the drain vaporization case 30 flows out of the drain vaporization case 30 and communicates with the drain vaporization exhaust port 15. A side portion of the drain vaporization case 30 where the inflow port 31 is opened is in contact with the cover panel 12, and both are sealed by a packing (not shown) and pass through the drain vaporization air supply port 14 and the inside of the housing case 10. It is structured not to communicate with combustion air.

  Inside the drain vaporization case 30, a drain pipe 33, a water seal 34, a neutralizer 35, a drain tank 36, a drain supply pipe 37, a drain supply valve 38, a tank water level sensor 39 and a drain vaporization processing unit 50 are provided. The drain pipe 33 is a pipe that connects the lower end portion of the drain receiving portion 27 in an inclined state and the drain tank 36.

  The water sealing part 34 is provided in the middle part of the drain pipe 33, and the drain pipe 33 is blocked by the drain flowing in the drain pipe 33. The neutralizer 35 is provided at a drain piping portion between the water sealing portion 34 and the drain tank 36, and neutralizes the drain flowing from the water sealing portion 34 through the drain piping 33.

  The drain tank 36 accommodates the end portion of the drain pipe 33 penetrating the tank upper end wall in the tank, and stores the drain supplied from the neutralizer 35 via the drain pipe 33. The hole portion of the drain tank 36 through which the drain pipe 33 passes is not sealed. The drain supply pipe 37 is a pipe that connects the lower portion of the drain tank 36 and the drain vaporization processing unit 50. The drain supply valve 38 is an open / close electromagnetic valve that switches between when drain is supplied from the drain tank 36 via the drain supply pipe 37 to the drain vaporization processing unit 50 and when the drain is not supplied. The drain tank 36 may be provided in the vaporizing cloth 53 or the internal space of the gas flow path portion 55. Thereby, the internal volume of the drain vaporization case 30 can be made small.

  The tank water level sensor 39 is provided at a predetermined part of the drain tank 36 and detects the water level of the drain stored in the drain tank 36. The water level sensor includes a float type, an electrode type, a pressure type, and an optical type. In this embodiment, for example, an electrode type water level sensor is used as the tank water level sensor 39.

  The drain vaporization processing unit 50 vaporizes the drain supplied from the drain tank 36. FIG. 3 is a diagram illustrating the structure of the drain vaporization processing unit. As shown in FIG. 3, the drain vaporization processing unit 50 includes a drain tray 51, a tray water level sensor 52, a vaporization cloth 53, a vaporization cloth holding part 54, a gas flow path part 55, and a vaporization fan 56 as main components. Prepare.

  The drain tray 51 accommodates the end portion of the drain supply pipe 37 penetrating the tray side wall in the tray, and is supplied from the drain tank 36 through the drain supply pipe 37 when the drain supply valve 38 is in an open state. Save the drain. The hole portion of the drain tray 51 through which the drain supply pipe 37 passes is sealed.

  The tray water level sensor 52 is provided at a predetermined portion of the drain tray 51 and detects the water level of the drain stored in the drain tray 51. In the present embodiment, for example, a photoelectric water level sensor that measures the height of the water surface by applying ultrasonic waves or light is used as the tray water level sensor 52.

  When a photoelectric water level sensor is used as the tray water level sensor 52, it is caused by dust that reaches the drain tray 51 in the drain vaporizing case 30 from the drain vaporizing air supply port 14 through the inlet 31 of the drain vaporizing case 30. Thus, the malfunction of the water level detection in the tray water level sensor 52 can be prevented, and the accurate water level can be detected. In addition, as dust, there are oils and fats caused by two-cycle engine exhaust, soil particles caused by soil, sand, pebbles, etc. in schoolyards and fields, carbon black and fallen leaves caused by diesel oil vehicle exhaust .

  The vaporizing cloth 53 is a woven or non-woven cloth having a plurality of fine pores having a three-dimensional network shape, and enters the drain vaporizing case 30 from the drain vaporizing air supply port 14 through the inlet 31 of the drain vaporizing case 30. It arrange | positions on the flow path of the air for drain vapor | steam sent. It is preferable that the vaporizing cloth 53 has a large effective vaporization area. For example, there is a structure in which a pair of base fabric sheets that are three-dimensional are formed by connecting a plurality of fibers that are thinner than the fibers used in the base fabric sheet between a pair of base fabric sheets having a mesh shape. . When the vaporizing cloth 53 having such a structure is used for negative pressure suction vaporization, even if part of the plurality of pores formed in the vaporizing cloth 53 is clogged with dust, it bypasses the periphery of the part. Thus, since the flow of the atmosphere passing through the vaporizing cloth 53 and the liquid penetrating the vaporizing cloth 53 is ensured, the effective vaporization area of the vaporizing cloth 53 is improved. If a pair of base fabric sheets is entangled with thin fibers to form a three-dimensional structure, the base fabric sheet becomes relatively hard and is not suitable for positive pressure jet vaporization. However, in the negative pressure suction vaporization, since the hardness of the base fabric sheet is superior to the negative pressure pressure in the negative pressure suction vaporization, the deformation of the vaporization cloth 53 (the pores become smaller and the effective vaporization area becomes smaller). ) And the effective vaporization area is improved. Note that the mesh of the vaporizing cloth 53 shown in FIG. 3 is shown large for convenience.

  The vaporizing cloth holding unit 54 holds the vaporizing cloth 53 in a state where the lower end portion of the vaporizing cloth 53 is immersed in the drain stored in the drain tray 51. Since the lower end portion of the vaporizing cloth 53 is immersed in the drain, the drain penetrates into the vaporizing cloth 53 by capillary action. In particular, since it has a three-dimensional network shape, penetration by capillary action is rapid. In the present embodiment, the vaporized cloth holding part 54 includes, for example, four struts 54B and a cloth fixing frame part 54A. The support posts 54B are arranged so as to be positioned at the respective vertices of the quadrangle, and the lower ends of the support posts 54B are fixed to the bottom wall in the drain tray 51. The cloth fixing frame portion 54A is attached to the upper end portion of each column 54B, and four vaporizing cloths 53 positioned between the columns are fixed to the cloth fixing frame portion 54A by screws or the like. At least one vaporizing cloth 53 of the four vaporizing cloths 53 is opposed to the inlet 31 of the drain vaporizing case 30, but suction is performed from the entire circumference. The vaporizing cloth 53 may have a single cylindrical configuration instead of the four-layer configuration, and the vaporized cloth holding portion 54 is not limited to a quadrangular shape but may be a cylindrical shape.

  In addition, when water is supplied to the vaporizing cloth 53 using a pump, a member for separating and sorting the dust is necessary to prevent a lock phenomenon that occurs when the dust is sucked into the pump. . On the other hand, in this embodiment, since the drain penetrates the vaporizing cloth 53 by capillary action, it is not necessary to separate and sort the dust.

  The gas flow path portion 55 is disposed above the vaporizing cloth 53 and drains vaporized drain vapor sent to the vaporizing cloth 53 and gas drained by the vaporizing cloth 53 by the drain vaporizing air. This is one of the elements that constitute the partition member that is partitioned so as to be guided to the exhaust port 15 side. In the present embodiment, the lower end portion of the gas flow path portion 55 is fixed to the cloth fixing frame portion 54 </ b> A of the vaporized cloth holding portion 54. The vaporizing cloth 53 may need to be replaced when the installation environment of the hot water supply device 1 is extremely incompatible (environment in which a plurality of pores formed in the vaporizing cloth 53 are easily clogged with dust). Assuming such a case, in the present application, at the lower end portion 6 of the gas flow passage portion 55 (two front locations and four lateral locations. The side four locations use decorative screws. Some are not shown). The cloth fixing frame portion 54A is fixed and brought into close contact, and the back is brought into close contact with a packing member (not shown). When the gas flow path portion 55 is removed from the front and bottom 2 locations (not shown) and the gas flow passage portion 55 is removed from the side of the gas flow passage 55, the front plate of the gas flow passage 55 is removed and vaporized. The vaporized cloth holding part 54 holding the cloth 53 can be removed from the front. When the vaporizing cloth holding portion 54 is removed in this manner, the vaporizing cloth 53 can be removed at the same time, so that the vaporizing cloth 53 can be replaced by removing the cover panel 12. In other words, since the vaporizing cloth 53 is composed of four sheets or is a cylindrical solid structure constituted by a cylindrical shape, maintenance can be easily performed together with the vaporizing cloth holding portion 54 having a cylindrical solid structure to be held. It is arranged on the cover panel 12 side so that it can be removed integrally.

The vaporizing fan 56 is provided above the gas flow path portion 55. In this embodiment, it attaches to the upper end part of the gas flow-path part 55, and is provided just before the outflow port 32 of the drain vaporization case 30 (FIG. 2). Due to the negative pressure generated by the operation of the vaporizing fan 56, the drain vaporizing air flows from the drain vaporizing air supply port 14 of the housing case 10 through the inlet 31 of the drain vaporizing case 30 to the entire circumference of the vaporizing cloth 53. It is captured. Further, the vaporizing fan 56 sends the gas drain vaporized by the vaporizing cloth 53 by the drain vaporizing air and the drain vaporizing air taken into the vaporizing cloth 53 to the drain vaporizing exhaust port 15 via the gas flow path portion 55. send. For example, when a high-pressure low-efficiency fan such as a sirocco fan or a turbofan is applied as the vaporizing fan 56, the cost generated by latent heat (from a water heater without a latent heat exchanger to a latent heat recovery type water heater). The cost of equipment for the latent heat exchanger 26, drain tank, etc. generated by the change, and the cost of the drain treatment work were increased by reducing the gas cost, but more than the cost generated by the latent heat due to the increased electricity cost However, the cost of vaporization will increase, and the gas price will not even be reduced. Therefore, low-pressure high-efficiency fans such as axial fans and cross-flow fans that do not have a large electricity bill are applied. When the vaporizing fan 56 is driven, the inside of the drain vaporizing case 30 becomes negative pressure. This negative pressure ensures detouring when dust is clogged in some of the plurality of pores formed in the vaporizing cloth 53, and can prevent generation of sound. That is, when positive pressure air with unevenness (which tends to cause drift) generated by the vaporizing fan 56 is blown onto the vaporizing cloth 53 (positive pressure vaporization), the vaporizing cloth 53 has rigidity (positive pressure). Wind noise is generated when it is securely held so that it does not move even when it is exposed to air, and when the vaporizing cloth 53 is not rigid (when it is not securely held), the vaporizing cloth 53 is blown by the wind, and a flickering sound is generated. In this application, the generation of sound is generated by using negative pressure suction vaporization (suction) that uses a negative pressure with a low absolute value for vaporization because it is almost equal pressure (no unevenness) without using uneven positive pressure. In addition to preventing, the sealing property of the drain vaporizing case 30 with the cover panel 12 and the housing case 10 is easy and reliable, and dust is clogged in some of the plurality of pores formed in the vaporizing cloth 53. The detour is also sure.
In particular, when uneven positive pressure air generated by the vaporizing fan 56 is blown onto the vaporizing cloth 53 and the vaporizing cloth 53 is disposed opposite to the outflow port 32, a flapping sound of the vaporizing cloth 53 is generated. Exit directly from the outlet 32. Furthermore, if even the blades of the vaporizing fan 56 are arranged opposite to the outflow port 32, even the wind noise of the blades comes out directly from the outflow port 32. In the present application, the vaporizing cloth 53 and the vaporizing fan 56 are not disposed opposite to the outflow port 32 so that no direct sound is emitted from the outflow port 32.

  FIG. 4 is a diagram illustrating a flow path in the housing case. As shown in FIG. 4, in the housing case 10, from the combustion flow path FP <b> 1 for the combustion air flowing from the combustion air supply port 13 to the outlet 22 of the combustion case 20, and the drain vaporization air supply port 14. The drain vaporization air flowing to the outlet 32 of the drain vaporization case 30 is isolated from the drain flow path FP2 without crossing each other. For this reason, even if there is a fluctuation in the amount of air flowing through the drain flow path FP2, the influence of the fluctuation on the combustion air flowing through the combustion flow path FP1 is reduced. As a result, the combustibility in the combustion case 20 is reduced. Becomes stable. In addition, corrosion of the combustion case 20 due to drain is reduced.

  The flow path from each of the outlets 22 and 32 to the drain vaporization exhaust port 15 is a shared flow path for the combustion flow path FP1 and the drain flow path FP2. The combustion channel FP <b> 1 is narrowed in the vicinity of the outlet 22. The combustion air flowing in the combustion flow path FP1 increases in flow rate by narrowing the flow path, and loosely intersects with the gas drain flowing in the drain flow path FP2 to reach the drain vaporization exhaust port 15. As a result, the combustion flow path FP1 assists the flow of the drain flow path FP2, in other words, the gas drain of the drain flow path FP2 is sucked (involved) by the force that the combustion flow path FP1 exits. More gas drain than the amount of flow created by the vaporizing fan 56 during non-combustion.

  The combustion fan 23 that creates a flow in the combustion flow path FP1 is counteracted by an instantaneously strong wind during a typhoon or the like (for example, by Strong breeze, instantaneously countering a high wind pressure at the hot water supply device 1), etc. A high-pressure fan is applied to avoid this. As a result, a high pressure other than when a strong wind is blown instantaneously can be used to suck the gas drain. When a strong wind is blown instantaneously, a part of the exhaust gas exiting from the outlet 22 and the wind flowing in from the drain vaporizing exhaust port 15 may be mixed and may flow backward through the outlet 32. The backflow air passes through the vaporizing cloth 53 and is discharged from the drain vaporizing air supply port 14 to the outside of the housing case 10. At the time of this reverse flow, the wind flowing from the drain vaporization exhaust port 15 is mixed with the exhaust gas (for example, 100% humidity) (the humidity is lowered), so that drain vaporization (backflow vaporization) is performed when passing through the vaporization cloth 53. That is, the combustion fan 23 and the vaporizing fan 56 are separated (one is a high-pressure type and the other is a low-pressure type), and even when the vaporizing fan 56 is blown with the same air volume, the low-pressure type is less expensive than the high-pressure type. In addition, the outlet 22 and the outlet 32 are joined to form the drain vaporization exhaust port 15, so that normal vaporization is normally performed, and reverse flow vaporization is performed when a strong wind blows instantaneously. Thus, drain vaporization can be performed efficiently at low cost.

  In the case of the present application in which a low-pressure fan is used as the vaporizing fan 56, the kinetic energy itself given to the gas drain is low. Since the gas drain is heavier than the exhaust flowing through the combustion flow path FP1 at about room temperature, the gas drain in the drain flow path FP2 is substantially omitted so as to follow the combustion air flowing through the combustion flow path FP1. Even if it flows in parallel and comes out from the exhaust port 15 for vaporizing the drain, the gas drain is separated and dropped in the middle. In this application, gas drain with low kinetic energy is pushed from behind with combustion air with high kinetic energy (the kinetic energy of combustion air is high because a high-pressure fan is used) and transported far away. It is possible to diffuse the combustion air far away. For this reason, the flow paths from the respective outlets 22 and 32 to the drain evaporation exhaust port 15 are shared flow paths.

  Further, the drain portion 27 through which the drain receiving portion 27 that guides the drain generated in the combustion case 20 to the drain vaporizing case 30 passes is sealed, and the drain vaporizing case on the downstream side of the drain receiving portion 27 is sealed. Within 30, a water seal 34 is formed. For this reason, when the combustion fan 23 is driven, the drain in the drain vaporization case 30 is prevented from flowing back to the combustion case 20.

  As shown in FIG. 2, the combustion fan 23 and the vaporizing fan 56 described above are connected to a controller 60. The drain replenishing valve 38, the gas on-off valve 42, the gas proportional valve 43, and the switching valve 49 are also connected to the controller 60. Further, the tank water level sensor 39, the feed water flow rate sensor 45, the hot water supply thermistor 47 and the tray water level sensor 52 are also connected to the controller 60.

  The controller 60 appropriately controls the combustion fan 23, the gas on-off valve 42 and the gas proportional valve 43 based on the water supply flow rate sensor 45, the hot water supply thermistor 47, etc., and the hot water having a predetermined temperature is connected to the water tap connected to the hot water supply pipe 46. The hot water supply process which supplies is performed.

That is, the controller 60 detects the water flow value based on the water supply flow rate sensor 45 at predetermined intervals. Further, the controller 60 acquires the previous water supply temperature information based on the opening information of the gas proportional valve 43 at the time of the last hot water discharge, the hot water temperature information of the hot water supply thermistor 47, and the hot water amount information of the water supply flow rate sensor 45, Hold.
When the controller 60 detects the water flow value from the water supply flow rate sensor 45, the controller 60 opens the gas on-off valve 42. At this time, the controller 60 sets the temperature of the gas proportional valve 43 to be set to the remote controller and to be the hot water set to the hot water set temperature from the previous water supply temperature information, the hot water set temperature information set in the remote controller, and the water flow value information from the water supply flow rate sensor 45. Calculate and control the opening (feed forward control). Then, the controller 60 opens the gas proportional valve 43 (feedback control) at an opening degree at which the hot water temperature information of the hot water supply thermistor 47 and the hot water set temperature information set in the remote control coincide with each other, and updates the hot water temperature information.
Further, the controller 60 per unit time of the combustion fan 23 so that the gas amount supplied to the burner 24 and the air amount (combustion air amount) supplied into the combustion case 20 are maintained in a predetermined relationship. Control the number of revolutions.
In this way, the controller 60 performs the hot water supply process, and supplies hot water at a hot water supply set temperature to the hot water supply pipe 46 when the faucet is used.

  When the controller 60 is executing the above-described hot water supply process, the controller 60 appropriately controls the switching valve 49 based on the tank water level sensor 39, and executes the flow path switching process for switching the flow path of the water supplied from the water supply pipe 44. To do. This flow path switching process is executed according to the flowchart shown in FIG.

  That is, as shown in FIG. 5, the controller 60 proceeds to step SP1 at predetermined intervals to recognize whether or not the burner 24 is in a burning state. Here, when the burner 24 is not burned, the controller 60 returns to step SP1 and repeats the above processing.

  On the other hand, when the burner 24 is in a state of burning, the controller 60 proceeds to the next step SP2, and based on the tank water level sensor 39, whether or not the drain tank water level is equal to or higher than the tank allowable water level. Recognize. The drain tank water level is the water level of the drain stored in the drain tank 36, and the tank allowable water level is a threshold set as a water level corresponding to the storage amount allowed in the drain tank 36.

Here, when the drain tank water level is lower than the tank allowable water level, this means that even if the drain is continuously stored in the drain tank 36, there is a low possibility of the drain overflowing from the drain tank 36. In this case, the controller 60 proceeds to step SP3.
In step SP3, the controller 60 passes the sensible heat exchanger 25 via the latent heat exchanger 26 from the second water channel that supplies the sensible heat exchanger 25 without passing through the latent heat exchanger 26. After switching the switching valve 49 to the first water channel that supplies water, the process returns to step SP1. If the switching valve 49 is already switched to the first water channel, the controller 60 maintains the switching state of the switching valve 49 and returns to step SP1.
In this state, the water supplied from the water supply pipe 44 flows through the water supply pipe 44 </ b> A from the branched portion of the water supply pipe 44 and flows into the sensible heat exchanger 25 through the latent heat exchanger 26. Accordingly, drain is generated in the latent heat exchanger 26, and the drain is supplied and stored in the drain tank 36 through the drain receiver 27, the drain pipe 33, the water seal 34 and the neutralizer 35 in this order.

On the other hand, when the drain tank water level is equal to or higher than the tank allowable water level, this means that there is a high possibility that the drain tank 36 will overflow if the drain tank 36 continues to store the drain. In this case, the controller 60 proceeds to step SP4.
In step SP4, the controller 60 starts from the first water channel supplying water to the sensible heat exchanger 25 via the latent heat exchanger 26, and passes through the sensible heat exchanger 25 without passing through the latent heat exchanger 26. After the switching valve 49 is switched to the second water channel for supplying water, the process returns to step SP1. If the switching valve 49 is already switched to the second water channel, the controller 60 maintains the switching state of the switching valve 49 and returns to step SP1.
In this state, most of the water supplied from the water supply pipe 44 flows mainly from the branch part of the water supply pipe 44 through the water supply pipe 44B and passes through the latent heat exchanger 26 to the sensible heat exchanger 25. Inflow. Therefore, no drain is generated in the latent heat exchanger 26, and an increase in the amount of drain stored in the drain tank 36 is suppressed. Furthermore, when all the water flows into the sensible heat exchanger 25 without passing through the latent heat exchanger 26, the temperature of the latent heat exchanger 26 increases, the water in the heat transfer tube 26A boils, and the heat transfer tube 26A. This can prevent clogging and corrosion.

  In this way, the controller 60 executes the flow path switching process, and supplies most of the water supplied from the water supply pipe 44 to the latent heat exchanger 26 when there is a high possibility that the drain will overflow from the drain tank 36. Without being supplied to the sensible heat exchanger 25.

  The controller 60 appropriately controls the vaporizing fan 56 and the drain replenishing valve 38 based on the tray water level sensor 52, and executes a drain vaporizing process for vaporizing the drain. This drain vaporization process is executed according to the flowchart shown in FIG.

That is, as shown in FIG. 6, the controller 60 proceeds to step SP <b> 11 at predetermined intervals, and recognizes based on the tray water level sensor 52 whether or not the water level of the drain tray 51 is below the tray allowable water level. The drain tray water level is the water level of the drain stored in the drain tray 51, and the tray allowable water level is a threshold set as a water level corresponding to the storage amount allowed in the drain tray 51.
Here, when the water level of the drain tray 51 is not below the allowable water level, the controller 60 proceeds to step SP16, drives the vaporizing fan 56, and returns to step SP11.
When the vaporizing fan 56 is driven, the drain vaporizing air is sent from the drain vaporizing air supply port 14 of the housing case 10 to the vaporizing cloth 53 through the inlet 31 of the drain vaporizing case 30, and the drain vaporizing The drain that permeates the vaporizing cloth 53 is vaporized by the air. For this reason, the drain again permeates from the drain tray 51 into the vaporizing cloth 53 by the vaporized drain amount, and the drain amount stored in the drain tray 51 decreases.

On the other hand, when the water level of the drain tray 51 is less than or equal to the allowable water level, the controller 60 proceeds to step SP12 and recognizes whether or not the burner 24 has been burned since the drain replenishing valve 38 opened last time is closed. When the burner 24 is not burned, the process returns to step SP11.
When the burner 24 is burned, the controller 60 proceeds to step SP13 and opens the drain supply valve 38 for a predetermined period (for example, 30 seconds), and a predetermined amount of drain from the drain tank 36 to the drain tray 51. After the transition, the controller 60 proceeds to step SP14.
When the drain tank 36 is empty, a predetermined amount of drain is not transferred from the drain tank 36 to the drain tray 51. If the drain tray 51 is below the allowable water level in step SP14, that is, if the drain tank 36 is almost empty, the controller 60 proceeds to step SP15, stops the vaporizing fan 56, and returns to step SP11.
On the other hand, if the drain tray 51 is not below the allowable water level in step SP14, that is, if the drain tank 36 is not nearly empty, the controller 40 proceeds to step SP16, drives the vaporizing fan 56, and returns to step SP11.

  In this manner, the controller 60 performs the drain vaporization process, and vaporizes the drain while adjusting so that the drain stored in the drain tray 51 does not become excessive or insufficient. Such adjustment is left to the signal of the tray water level sensor 52 using a structure that does not erroneously detect the water level by carbon black or the like. The pressure in the vicinity of the drain vaporization inlet 14 and the drain vaporization outlet 15 and the pressure in the vicinity of the drain vaporization inlet 14 and the drain vaporization outlet 15 are positive pressures and one of them is positive. If there is a large difference as in the case of negative pressure, the air flows as if the vaporizing fan 56 is operating, even though the vaporizing fan 56 is not operating, and is included in the drain. The nitric acid (HNO3) component may be changed to dinitrogen pentoxide (N2O5: commonly known as anhydrous nitric acid with hygroscopicity).

  In the first embodiment of the vaporization processing system of Patent Document 1 (for example, FIG. 3 of Patent Document 1), one of the air supply / exhaust ports is provided on one end side of the housing side surface of the vaporizer, and the other of the air supply / exhaust ports is provided on the other end side. Therefore, when the wind blown toward the vaporizer hits the housing side surface (blower inlet or outlet) of the vaporizer, one of the air supply / exhaust ports has a positive pressure and the other of the air supply / exhaust ports has a negative pressure. Thus, air (wind) flows through the vaporizer even when the vaporizing fan is not driven. For this reason, the vaporization of the drain in the vaporizer proceeds even when the vaporizing fan is not driven. Similarly, also in the second embodiment (for example, FIG. 9 of Patent Document 1), when the wind blows up substantially obliquely from below, the supply side of the storage case in which the blower fan and the heater are stored becomes positive pressure, and the storage case Since the vicinity of the air outlet that hits the leeward (the central part of the air outlet) is negative, air (wind) flows through the vaporizer even when the vaporizing fan is not driven (because there is no pressure receiving piece RP equivalent in this application) A negative pressure zone is created (which occupies a large area because the area near the air outlet that hits the lee of the storage case occupies as much as 40%), and air (wind) flows even when the vaporizing fan is not driven. Air flows because the effective area necessary for the same pressure using RP is not taken).

  In the case of using a vaporizing device in which the vaporizing cloth 53 has a ventilation resistance (in the case of negative pressure suction vaporization. Even if the negative pressure suction is performed, the vaporizing cloth 53 has a ventilation resistance. Focusing on the point that the pressure in the vicinity of the vaporization inlet 14 and the drain vaporization outlet 15 does not flow through the vaporizer unless an extreme differential pressure occurs such that one is positive and the other is negative. In the present application, the pressure near the drain vaporization inlet 14 and the drain vaporization outlet 15 are both positive pressure or both negative pressure (the drain vaporization inlet 14 and the drain vaporization outlet). The pressure receiving piece RP is provided so that the pressure of 15 is balanced), and countermeasures for light winds are taken (when light wind (light air or less)), the flange FR having a depth of about 1 cm can serve as the pressure receiving piece RP. Depth is about 1cm = open from the edge of the cover panel Distance to). In other words, in the vaporizer when there is an extreme differential pressure, such as a positive pressure in one side and a negative pressure in the other, the air does not flow in the vaporizer when both are positive, or both are negative. In order for air to flow through, the vaporizing cloth 53 needs to have a ventilation resistance (bidirectional resistance in both directions), and a structure in which air can be bypassed from around the vaporizing cloth 53 (a structure that does not have a ventilation resistance in both directions). ), The air does not flow through the vaporizer only when an extreme pressure difference occurs such that one is a positive pressure and the other is a negative pressure. Therefore, the pressure receiving piece RP is particularly effective in a structure in which the drainage flow path FP2 is entirely covered with the vaporizing cloth 53 to provide a ventilation resistance.

  In order for the vaporizing cloth 53 to have a ventilation resistance, it is necessary that all of the ventilation (ventilation) passages are partitioned by the vaporizing cloth 53 and the like. There should be no air passage around the fabric 53. Even if there is an air passage that bypasses the vaporizing cloth 53, it is possible to vaporize by a positive pressure injection vaporizing system (a vaporizing system in which air from a fan or the like is pressed against the vaporizing cloth 53).

  In the present embodiment, measures are taken assuming that air flows in the vaporizer other than when the wind is blowing. For example, in the present embodiment, the drain vaporization case 30 and the combustion case 20 are kept almost airtight with each other, there is no movement of air between them, and the combustion fan 23 and the vaporization fan 56 are individually provided. As a result, even if a corrosive component such as nitrous oxide is attached to the vaporizing cloth 53, the corrosive gas leaks from the drain vaporizing case 30 due to the intake pressure of the combustion fan 23 that starts to move at the start of combustion. It is possible to reliably avoid a situation in which a gas leaks due to intrusion into the combustion case 20 and corrodes the metal constituting the gas passage or the like. For example, as a countermeasure described above, the combustion case 20 of corrosive gas is obtained by using positive pressure injection vaporization without using a dedicated case, using two dedicated fans, and linking the combustion fan 23 and the vaporizing fan 56. Although entry into the inside can be prevented, corrosive gas will enter the combustion case 20 if the vaporizing fan 56 is not controlled even in accordance with dust (venting resistance) adhering to the vaporizing cloth 53. Therefore, the structure of the present embodiment is reached because it is substantially impossible to control unless a wind speed sensor or the like is used.

  Further, in the present embodiment, the pressure in the vicinity of the drain vaporization inlet 14 and the drain vaporization outlet 15 is interlocked as if both are positive pressure or both negative pressure in the case of a breeze. The air supply port 13 is also interlocked. Specifically, since the operation of the vaporizing fan is likely to be a bedtime, it is preferable to operate with a light breeze. At this time, even if the air is discharged from the drain gas supply port 14, if the combustion gas supply port 13 has a negative pressure, a corrosive gas (for example, SOx) enters the combustion case 20.

  Furthermore, in this embodiment, the drainage permeates the vaporizing cloth 53 by a capillary phenomenon (non-water film forming capillary permeation method). This is because in the dripping method, depending on the amount of dripping, a part of the plurality of pores formed in the vaporizing cloth 53 becomes clogged with drainage, and the ventilation resistance changes. For example, when the air is blown by the positive pressure injection vaporization method even though the airflow resistance is changed, in some cases, recirculation (clogged in the pores of the vaporizing cloth 53 (which becomes a water film)) drain = nitric acid is wind pressure (A phenomenon in which the air is scattered into the vaporizing fan 56 again), and in some cases, the fine air of the drain may enter the combustion case 20 due to the intake pressure of the combustion fan 23 (vaporization to the outlet 32). If the cloth 53 is arranged oppositely, the scattered nitric acid falls on the person walking in front of the hot water supply device 1. If the drain is neutralized, the nitric acid can be prevented from splashing, but white powder is used instead. Scatter around). In this case, the combustion case 20 may be corroded. In addition to the change in ventilation resistance, when the resistance changes and recirculates, for example, there is a case where a strong wind blows instantaneously (it can be said that the ventilation resistance changes due to the wind and recirculates). In order to prevent air loss due to EGR (recirculation), the present embodiment partitions the combustion case 20 and the drain vaporization case 30 with high sealing properties.

  By the way, although the hot water supply apparatus 1 like this embodiment is often installed in the north side of a building in the case of a detached house, on the contrary, it will face the garden of the south side of a neighbor. When foreign matter such as fallen leaves is sucked from the drain vaporization air supply port 14 and adheres to the surface of the vaporization cloth 53, one end of the foreign matter such as fallen leaves adheres to the surface of the vaporization cloth 53 and the other end is the drain vaporization air supply port. 14 may still be caught on the open end of 14. If the dripping method is used, fine dirt such as carbon black adhering to the vaporizing cloth 53 can be washed away. However, when the foreign matter such as the fallen leaves adheres to the vaporizing cloth 53, the dripped drain removes the foreign matter such as the fallen leaves. When the sheet metal is painted during manufacture of the hot water supply device, which may reach the drain vaporization air supply port 14, the coating of the end portion is difficult due to the surface tension, and the coating thickness is thin and rusted easily. Drain vaporization inlet 14 and other inlets are open ends that have been cut and raised or burred for rain return, so that dripped drain is continuously attached and rust is noticeable. However, the problem of rust can be solved if drainage penetrates by capillary action.

Next, the pressure receiving piece RP will be described in detail. When the wind hits a building or the like, the wind is dammed on the side where the wind hits, so the air pressure increases, and on the other side, air is sucked back, so the air pressure decreases. This is called a wind pressure zone (see FIGS. 9A and 9B). The side that is brightened by shining light is the positive wind pressure zone, and the shadow is the negative pressure zone. While the light travels straight, the wind wraps around the building or the like. Therefore, at the corner of the building, an error of θ occurs between the surface that becomes bright when the light is applied and the positive pressure wind pressure zone of the wind. In other words, a positive wind pressure zone does not occur unless it is slightly inside the corner of the structure. In other words, a positive wind pressure zone is created by providing a portion that receives pressure over the front, rear, left, and right, that is, the entire circumference. In the present embodiment, a pressure receiving piece for creating a positive pressure wind pressure zone around the circumference of the combustion air inlet 13, drain vaporization air inlet 14, and drain vaporization exhaust port 15 that is desired to be a positive wind pressure zone. RP is provided.
Next, the pressure receiving piece RP related to the combustion air supply port 13, the drain vaporization air supply port 14, and the drain vaporization exhaust port 15 will be described in detail. A combustion air supply port 13, a drain gas supply port 14, and a drain gas exhaust port 15 are opened in front of the cover panel 12. The periphery of the opening is the front of the cover panel 12, and the front is a pressure receiving piece. Plays the role of RP. FIG. 10A shows a wind pressure zone of positive pressure produced by the pressure receiving piece RP surrounded by a one-dot chain line. If the surroundings of the drain gas supply port 14 and the drain gas exhaust port 15 are approximately the same positive pressure due to the front wind, the pressures around the drain gas supply port 14 and the drain gas exhaust port 15 are balanced. As a result, air does not flow into the drain vaporization case 30. If pressure is applied to one end of a sealed container just by Pascal's principle, the pressure is transmitted to the other end while maintaining the same pressure, so it is the same as balancing if pressure is also applied to the other end ( Refer to Fig. 10B, where the wavy lines in the figure indicate the water surface indicated by the Pascal principle). By the way, in this embodiment, the drain vaporization exhaust port 15 is located slightly behind the drain vaporization air supply port 14 (more precisely, the outflow port 32 and the outflow port 22 communicate with each other. See FIG. 10C. ). In such a case, if the pressure at the outlet 22 is low (if the pressure at the other-end combustion inlet 13 is low), there is no balance. Even if pressure is applied to one end of the container, water leaks if there is a hole in the other end (a hole where the pressure at the outflow port 22 is low). That is, although it is influenced by the combustion air supply port 13 on the other end side having the drain vaporization exhaust port 15 (outflow port 22) as one end, the combustion air supply port 13 is also positively pressurized by the front wind as described later. The pressure receiving piece RP is provided and balanced so as to indicate the wind pressure zone (see FIG. 10D). In addition, if a pressure receiving piece is provided around the combustion air supply port 13, the drain gas supply air port 14, and the drain gas exhaust port 15 so as to show a positive wind pressure zone in the front wind, The pressure in the vicinity of the air supply port 13, the drain gas supply port 14, and the drain gas exhaust port 15 is balanced without generating an extreme differential pressure such that one is a positive pressure and the other is a negative pressure. The low-pressure air produced by the fan 56 can discharge the drain vaporized by the drain vaporizing air.

  Next, the pressure receiving piece RP related to the combustion air inlet 13 will be described in detail. The combustion air inlet 13 is provided around the cover panel 12 in the left-right direction (see FIG. 11A), and a flange FR is provided outside the cover panel 12 to serve as a pressure receiving piece RP. (See FIG. 11B). The flange body FR is fixed to a predetermined portion of the case body 11 using bolts at a total of four locations, ie, the upper two locations and the lower two locations. FIG. 11B and FIG. 11C show a cross section at the combustion air supply port 13 and a cross section at the drain gasification exhaust port 15. As shown in the figure, it can be seen that the pressure around the air supply / exhaust port is positively balanced against the front wind.

  Next, the effect of crosswind will be described in detail. As shown in FIG. 11A, the cover panel 12 is doubled, and the combustion air supply passes through the combustion flow path FP1 from the combustion air supply port 13. As shown in FIG. 11D, when the cross air is applied to the combustion air inlet 13, one of the combustion air inlets 13 becomes positive pressure and the other becomes negative pressure, so that the wind blows from high pressure to low pressure. Air flows in the double panel of the cover panel 12 from the pressurized wind pressure zone to the negative wind pressure zone. This flow creates a negative pressure at the combustion channel outlet 17. Similarly, the drain vaporization exhaust port 15 also has a negative pressure (see FIG. 11E). As a result, in the case of the configuration of the present embodiment, the pressure around the air supply / exhaust port is balanced in the same manner as the frontal wind even in the case of cross wind, and no flow occurs in the combustion case 20 or the drain vaporization case 30, and the combustion fan 23, the flow is generated only by driving the vaporizing fan 56. In FIG. 11, a portion surrounded by a one-dot chain line is shown as a positive pressure wind pressure zone, and a portion surrounded by a two-dot chain line is shown as a negative pressure wind pressure zone.

  In addition, the hot water supply is turned off due to the absence of long-term supply, and hot water supply is started with the nitric acid (HNO3) component contained in the drain changed to dinitrogen pentoxide (N2O5: commonly known as anhydrous nitric acid with hygroscopicity). In some cases, dinitrogen pentoxide is sucked out from the outlet 32 by exhaust suction of the outlet 22 until drain is generated and nitrous pentoxide in the drain vaporization case 30 is changed to a nitric acid aqueous solution. In the present embodiment, the exhaust gas (humidity 100%) exiting from the outlet 22 and the gas containing dinitrogen pentoxide exiting from the outlet 32 are gently crossed, thereby reacting the nitrous oxide with sufficient moisture in the exhaust gas. (Dinitrogen pentoxide + moisture → nitric acid) and return to the same component as the exhaust gas containing the nitric acid component that has come out of the sensible heat exchanger 25 (the concentration of the nitric acid component is diluted with the air volume of the combustion fan 23) Is low concentration) and can be diffused far away, so that problems such as ambient corrosion can be avoided (by using substantially the same exhaust components and the same concentration as the conventional water heater without the latent heat exchanger 26). No problem). As described above, another example in which dinitrogen pentoxide in the drain vaporization case 30 flows out will be described in detail. As described above, the hot water supply device 1 may be installed on the PS, or may be installed on a wall of a veranda or a detached house, for example. There is an installation in which the flange does not play the role of the pressure receiving piece RP when subjected to strong winds such as typhoons when not in use for a long time (when nitrous oxide is generated). When the hot water supply device 1 is installed in the PS, a drain vaporization inlet 14, a drain vaporization outlet 15, a combustion vapor inlet 13, a flange FR of the cover panel 12, which are opened in front of the cover panel 12, Since the wall surface is substantially the same plane (in other words, the wall surface is a huge pressure receiving piece RP), when wind blows from the front to the front of the cover panel 12, as shown in FIG. 12A. All openings have positive pressure. On the other hand, when the wind blows from the side, all the openings have a negative pressure, so there is no risk of nitrous oxide escaping (in the first place, there is no problem because it is diluted even if it leaks because it is under strong wind). However, when the hot water supply device 1 is installed on the wall and wind is blown from the front, the drain vaporization supply port 14 and the drain vaporization exhaust port 15 become positive as shown in FIG. 12B. On the other hand, the combustion air supply port 13 having an opening in the flange FR of the cover panel 12 may have a negative pressure (in other words, the depth of the pressure receiving piece RP is too small). In such a case, dinitrogen pentoxide may leak, but since it is under strong wind, it will be diluted even if it leaks, so there will be no problem.

  By the way, when the drain which permeate | transmits the vaporization cloth 53 is vaporized by the drain vaporization air sent through the inflow port 31 of the drain vaporization case 30, the vaporization amount differs according to the level of humidity. For this reason, in this embodiment, the rotation speed per unit time of the vaporizing fan is varied based on the amount of change in the water level per unit time.

That is, the water level / humidity relationship data indicating the relationship between the amount of change in the water level per unit time and the humidity is stored in the internal memory of the controller 60. The controller 60 acquires the amount of change in the water level per unit time based on the tray water level sensor 52, and estimates the humidity based on the acquired amount of change and the water level / humidity related data stored in the internal memory. When driving the vaporizing fan 56 in step SP12 described above, the controller 60 controls the vaporizing fan 56 such that the higher the humidity is, the larger the number of revolutions per unit time of the vaporizing fan 56 is. For example, when the average humidity at the location where the hot water supply apparatus 1 is installed, a reference rotation speed set as a reference is selected, and the reference rotation speed is increased or decreased according to the degree of elevation from the average humidity.
Therefore, the higher the humidity is, the higher the air volume and the wind speed of the drain vaporizing air fed into the vaporizing cloth 53, and the increase / decrease in the evaporation volume due to the humidity is reduced.

By the way, in the hot water supply device 1 of the present embodiment, the drain vaporization air supply port 14 and the drain vaporization exhaust port 15 serving as the entrance and exit of the drain flow path FP2 are on the front side opposite to the rear wall 11A of the case body 11. Opened in front of the cover panel 12 of the front panel to be arranged.
For this reason, the drain vapor supply port 14 and the drain vapor exhaust port 15 receive the wind coming toward the front surface of the cover panel 12 without generally receiving the wind toward the side surface of the cover panel 12.
Accordingly, the wind coming toward the front surface of the cover panel 12 enters from both the drain vaporization supply port 14 and the drain vaporization exhaust port 15 and is canceled, and the flow of the drain vaporization air caused by the wind is drained. This does not occur in the use flow path FP2.
As a result, the vaporization of the drain due to the wind is greatly reduced, and the humidity change width caused by the wind is substantially equal. In this way, the hot water supply apparatus 1 that can acquire accurate humidity based on the tray water level sensor 52 is provided.

  In the case where there is no breeze even though the pressure receiving piece RP is present, the flow of air caused by the wind is different depending on the wind pressure received at the drain vaporization supply port 14 and the drain vaporization exhaust port 15. There are cases where the humidity changes due to the FP2. Even in this case, since the controller 60 varies the number of revolutions per unit time of the vaporizing fan, it is possible to reduce the change in the amount of vaporization caused by the wind.

(2) Modification Although the said embodiment was demonstrated as an example, this invention is not limited to the said embodiment, It can change suitably.

In the above embodiment, the outer shape of the drain vaporization inlet 14 is circular, the number of the drain vaporization inlets 14 is plural, and the outer shape of the drain vaporization outlet 15 is elliptical. The number of the drain vaporization exhaust ports 15 is plural. However, the drain vapor supply port 14 and the drain vapor exhaust port 15 are not limited to the above-described embodiment, and can have various shapes and numbers.
Even in this case, since both the drain vapor supply port 14 and the drain vapor exhaust port 15 are provided in the cover panel 12, one of the supply and exhaust ports is provided in the cover panel 12 and the other is the cover panel 12. The wind pressure received by the drain vaporization supply port 14 and the drain vaporization exhaust port 15 can be approximated as compared to the case where the other components are provided. As a result, the correct humidity can be acquired based on the tray water level sensor 52 as in the above embodiment.
Further, the drain vapor supply port 14 is provided at the lower ends of the outer panel 12A and the inner panel 12B, and the drain vapor exhaust port 15 is provided at the upper ends of the outer panel 12A and the inner panel 12B. However, the drain vapor supply port 14 and the drain vapor exhaust port 15 are not limited to the above embodiment, and can be provided at various positions.
For example, as shown in FIG. 7, a drain vaporizing air supply port 14 may be provided at the lower end portion of the frame wall of the outer panel 12 </ b> A in the cover panel 12. When the drain vapor supply port 14 is provided at the lower end portion of the frame wall of the outer panel 12A, the opening directions of the drain vapor supply port 14 and the drain vapor exhaust port 15 are different. The wind coming from the front directly enters the drain vaporization exhaust port 15 but does not enter the drain vaporization supply port 14 directly. However, since the wind coming from the front of the housing case 10 is guided to the drain vaporization inlet 14 at the flange FR and the flange FR plays a role of the pressure receiving piece RP, the drain vaporization inlet 14 from the outside. The wind pressure received by the drain and the wind pressure received by the drain vaporization exhaust port 15 are approximately the same.
In this way, one of the drain vaporization inlet 14 and the drain vaporization outlet 15 is opened to the front side of the cover panel 12, and the other of the drain vaporization inlet 14 and the drain vaporization outlet 15 is provided. However, it may be a case where it opens to a cover panel part different from the front side of the cover panel 12. In this case, if it has pressure receiving piece RP so that the wind pressure of the wind coming from the front side of cover panel 12 can receive the same wind pressure as the opening opened to the cover panel part (same plane, or pressure receiving piece RP If it can be made to be the same plane using, substantially the same wind pressure zone can be obtained), and accurate humidity can be acquired based on the tray water level sensor 52 as in the above embodiment.
In short, it is only necessary that both the drain vaporization exhaust port 15 and the drain vaporization air supply port 14 be provided in the cover panel 12. The reason for this is that, as described above, compared to the case where one of the air supply / exhaust ports is provided in the cover panel 12 and the other is provided outside the cover panel 12, the drain vaporization air supply port 14 and the drain vaporization exhaust gas. This is because the wind pressure received at the mouth 15 can be approximated.
The drain vaporization inlet 14 is the upper part of the cover panel 12, and the combustion inlet 13 is the part having the flange FR of the cover panel 12 (the part provided with the pressure receiving piece RP). It does not matter either, and both may be the upper part or the flange part.

In the above embodiment, the number of revolutions per unit time of the vaporizing fan 56 is varied based on the amount of change in the water level per unit time (estimating the humidity). Instead of changing the rotation speed per unit time, or in addition to changing the rotation speed per unit time, the amount of drain to be transferred from the drain tank 36 to the drain tray 51 may be changed. .
Specifically, the controller 60 controls the drain supply valve 38 so that the open time of the drain supply valve 38 becomes shorter as the humidity is higher, for example. In this way, since the amount of drain supplied to the drain tray 51 is suppressed as the humidity becomes high and the situation becomes difficult to vaporize, it is possible to prevent the drain stored in the drain tray 51 from overflowing from the drain tray 51. it can.

In the above embodiment, the number of revolutions per unit time of the vaporizing fan 56 is varied based on the amount of change in the water level per unit time (estimating the humidity). However, the water heater 1 is provided with a temperature sensor, and the number of revolutions per unit time of the vaporizing fan 56 is based on the temperature obtained from the temperature sensor and the amount of change in the water level per unit time (estimating the humidity). May be varied.
Alternatively, when the combustion fan 23 is driven, compared to the case where the combustion fan 23 is not driven, the per unit time of the vaporizing fan 56 to be varied based on the amount of change in the water level per unit time. The vaporizing fan 56 may be controlled so that the number of rotations becomes smaller. Since the combustion heat generated in the combustion case 20 when the combustion fan 23 is driven is conducted to the drain vaporization case 30 in a considerable amount, the vaporization cloth 53 is compared with a case where the combustion fan 23 is not driven. There is a tendency for the amount of vaporized drainage to be increased in Therefore, when the combustion fan 23 is driven, drain vaporization is smoothly performed without increasing the blowing power of the vaporizing fan 56.
In the present embodiment, the flow path of the exhaust from the combustion exhaust port is narrowed, the exhaust flow velocity is accelerated, and the accelerated exhaust and the gas drain are intersected loosely. Since the gas drain is sucked by the force of exhausting, the drain vaporization is performed smoothly even if the rotation speed per unit time of the vaporizing fan 56 is small. The crossing at this time was performed while the gas drain was substantially horizontal while the exhaust was directed slightly downward.For example, the exhaust was directed slightly upward and the gas drain was directed more upward than the angle. You may cross. The outflow port 22 and the outflow port 32 are not arranged in the vertical direction, but the outflow port 22 and the outflow port 32 are arranged at the same height on the left and right sides, and one of them is allowed to flow slightly to the right and the other to the left. Alternatively, it may be allowed to cross loosely in front of the outlet 32. As described above, since the angle of the air flow from the exhaust port created by the vaporizing fan 56 and the combustion fan 23 is different, the combustion gas sent out by the combustion fan diffuses without staying in, for example, a common hallway or a veranda. It becomes easy to do.

Further, in the above embodiment, when the drain tank water level is equal to or higher than the tank allowable water level, the first heat channel supplying water to the sensible heat exchanger 25 via the latent heat exchanger 26 passes through the latent heat exchanger 26. The switching valve 49 was switched to the second water channel that supplies the sensible heat exchanger 25 without water. In addition, when the drain tank water level is lower than the tank allowable water level, the sensible heat is passed through the latent heat exchanger 26 from the second water channel that supplies the sensible heat exchanger 25 without passing through the latent heat exchanger 26. The switching valve 49 was switched to the first water channel that supplies water to the heat heat exchanger 25.
However, the switching valve 49 may be switched so that the opening amount of the switching valve 49 becomes an opening amount corresponding to the drain tank water level.
That is, the controller 60 gradually increases the opening amount on the second water channel side of the switching valve 49 so that the amount of water flowing to the second water channel increases as the drain tank water level increases, and the latent heat exchanger The amount of drain generation is reduced by increasing the amount of water that bypasses 26. Further, when the drain tank water level reaches the tank allowable water level, the controller 60 maximizes the opening amount of the switching valve 49 on the second water channel side so that the latent heat exchanger 26 does not generate drain. When the controller 60 switches the switching valve 49 in this way, a photoelectric water level sensor that measures the height of the water surface by applying ultrasonic waves or light is preferably used as the tank water level sensor 39. If a photoelectric water level sensor is used, the height of the water surface is detected steplessly. Based on the detected value, switching is performed so that the opening amount of the switching valve 49 becomes an opening amount corresponding to the drain tank water level. This is because it becomes easier for the controller 60 to switch the valve 49.

Further, in the above-described embodiment, the flow path of the combustion air that flows from the outlet 22 of the combustion case 20 to the drain vaporization exhaust port 15, and the drain that flows from the outlet 32 of the drain vaporization case 30 to the drain vaporization exhaust port 15. The flow path for the vaporizing air was a shared flow path for the combustion flow path FP1 and the drain flow path FP2. However, the combustion flow path FP1 and the drain flow path FP2 may be isolated from each other without crossing each other from the inlet to the outlet.
For example, this can be realized by providing a partition plate that partitions the flow path from the outlet 22 to the drain vaporization exhaust port 15 and the flow path from the outlet 32 to the drain vaporization exhaust port 15 (exhaust and gas It is preferable that the exhaust and the gas drain intersect with each other loosely after exiting the drain vaporization exhaust port 15 instead of discharging the drain substantially in parallel. As another example, instead of the above embodiment in which the drain vaporization exhaust port 15 and the combustion exhaust port are shared, the drain vaporization exhaust port 15 and the combustion exhaust port can be separated. . That is, for example, as shown in FIG. 8, an outflow port 22 is provided at a predetermined portion of the combustion case 20 in the case main body 11, and a combustion exhaust port 16 is provided outside the case main body 11. This can be realized by connecting with the chimney CY so as to communicate with the mouth 16. As a result, the structure is not shown in FIG. 10C but in the state shown in FIG. 10B (because the pressure of the combustion air inlet 13 is irrelevant). At times, the pressures near the drain gas supply port 14 and the drain gas exhaust port 15 are balanced so that an extreme differential pressure does not occur such that one is a positive pressure and the other is a negative pressure.

  Further, in the above embodiment, the vaporizing cloth holding portion 54 constituted by the cloth fixing frame portion 54A and the column 54B is in a state where the lower end portion of the vaporizing cloth 53 is immersed in the drain stored in the drain tray 51. 53 was retained. However, the holding structure for holding the vaporizing cloth 53 with the lower end immersed in the drain can be applied to other than the above embodiment. For example, a suspension support body such as a hook for suspending the vaporizing cloth 53 can be provided on the inner wall of the housing case 10, and the vaporization cloth 53 can be suspended and held on the suspension support body. Of course, a holding structure other than the above examples may be applied.

Moreover, in the said embodiment, the combustion case 20 is provided in the back wall 11A side made into the back of the said case main body 11 among the accommodation space of the case main body 11, and the drain vaporization case is on the front side opposite to the back wall 11A. 30 was provided. However, the combustion case 20 is provided on the right side (or left side) of the accommodation space of the case body 11 when the opening surface of the accommodation space is front, and the drain vaporization case 30 is provided on the left side (or right side). May be. In short, at least a part of the drain vaporization case 30 is opposed to the back surface of the cover panel 12, and the drain vaporization supply port 14 and the drain vaporization exhaust port 15 are provided in the opposed cover panel 12 portion. .
Further, a plurality of partitions may be provided in the drain tank 36, and the drain tank 36 may be filled with a neutralizing agent so that a neutralizing agent (calcium carbonate, magnesium oxide, etc.) does not leak into the drain tray 51. . As a result, it is possible to reliably prevent the surrounding corrosion until the neutralizing agent is used up, and even when the neutralizing agent is used up, the surrounding corrosion can be prevented, so that the management of the neutralizing agent becomes unnecessary.
Furthermore, a plurality of rooms are provided in the drain tank 36, and the drain from the first drain pipe 33 is introduced into the first room. If the first room is full of drain, the drain is placed in the second room. You may make it enter. A partition is provided in the second chamber as described above, and a neutralizer (magnesium oxide or the like) is filled in the second chamber so that the drain tray 51 does not leak. It is also possible to store untreated (strongly acidic) drains in the rooms and provide drain supply valves 38 in both the rooms so that the drains can flow from both the rooms toward the drain tray 51. For example, when vaporization proceeds during automatic pouring, etc., untreated drain is sent from the first room to sterilize the vaporizing cloth 53 with strong acidity, and people around the water heater are installed, such as at midnight. In a time zone where there is little traffic such as, it is also possible to send the treated drain from the second room and vaporize it. As a result, the vaporization system can be periodically sterilized with a strong acid drain, and the amount of the neutralizing agent mounted can be reduced.

  In addition, each component of the hot water supply device 1 is not limited to the contents other than those shown in the above-described embodiment or modification, and may be appropriately omitted, modified, or added with a well-known technique within the scope of achieving the object of the present invention. it can.

  The present invention can be used in the field of handling household or commercial water heaters.

  DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus, 10 ... Housing case, 11 ... Case main body, 12 ... Cover panel, 13 ... Combustion air inlet, 14 ... Drain vaporization inlet, 15 ... Drain vaporization exhaust 16 ... Combustion exhaust port, 20 ... Combustion case, 23 ... Combustion fan, 24 ... Burner, 25 ... Sensible heat exchanger, 26 ... Latent heat exchanger, 27 ... Drain receiver 30 ... Drain vaporizing case, 33 ... Drain piping, 34 ... Water seal, 35 ... Neutralizer, 36 ... Drain tank, 37 ... Drain supply pipe, 38 ... Drain supply valve, 39 …… Tank water level sensor, 50 …… Drain vaporization processing unit, 51 …… Drain tray, 52 …… Tray water level sensor, 53 …… Vaporization cloth, 54 …… Vaporization cloth holding part, 55 …… Gas flow path part, 56: Fan for vaporization, 60: Controller, RP: Pressure receiving piece

Claims (8)

A case body having a housing space;
A cover panel mounted on the case body and covering the accommodation space;
A sensible heat exchanger and a latent heat exchanger housed in the housing space; a vaporizing cloth housed in the housing space for vaporizing moisture in the drain generated in the latent heat exchanger;
With
The cover panel has a drain vaporization air supply port for supplying drain vaporization air to be supplied to the vaporization cloth from the outside of the accommodation space, and the drain vaporization air and moisture in the vaporized drain And both a drain vaporizing exhaust port for discharging the outside of the housing space ,
An inflow port communicating with the drain vaporization air supply port and an outflow port communicating with the drain vaporization exhaust port are accommodated, and the vaporization cloth into which the drain generated in the latent heat exchanger is permeated is accommodated. A drain vaporization case is provided in the housing space,
The flow path of the drain vaporization air flowing from the drain vaporization inlet to the outlet is a flow of combustion air for obtaining heat recovered by the sensible heat exchanger and the latent heat exchanger A hot water supply device characterized by being isolated without crossing a road . The hot water supply apparatus according to claim 1, wherein the drain vaporization air supply port and the drain vaporization exhaust port are provided so as to receive the same wind pressure from the outside. The cover panel is disposed on the front side opposite to the wall on which the case body is to be installed,
The hot water supply apparatus according to claim 1 or 2, wherein the drain vaporization air supply port and the drain vaporization exhaust port are opened on a front side of the cover panel. The cover panel is disposed on the front side opposite to the rear wall of the case body facing the installation site where the case body is to be installed,
One of the drain gas supply port and the drain gas exhaust port is opened on the front side of the cover panel,
The other of the drain vaporization air supply port and the drain vaporization exhaust port is opened to a cover panel portion different from the front side of the cover panel,
The cover panel end so that the cover panel part also has a positive pressure when the front side is a positive pressure, and the cover panel part also has a negative pressure when the front side is a negative pressure. The hot water supply device according to any one of claims 1 to 3, further comprising a pressure receiving piece having a predetermined distance from the portion to the opening. The said drain vaporization case given negative pressure, from claim 1 drain to penetrate into the vaporizing cloth by sucking the air in the drain vaporizing case from the drain vaporizing exhaust port, characterized in that it is vaporized The hot water supply apparatus according to any one of 4 . A pressure receiving piece is provided on the cover panel so that both the pressure near the drain vaporization inlet and the pressure near the drain vaporization outlet become positive pressure or negative pressure. Item 2. A hot water supply apparatus according to item 1. The vaporizing cloth is cylindrical,
Cylindrical the vaporizing fabric in the cylinder is claimed in claim 6, characterized in that it is a part from the drain vaporization supply port of the flow path of the drain vaporization air flowing up the outlet Water heater. A case body having a housing space;
A cover panel mounted on the case body and covering the accommodation space;
A sensible heat exchanger and a latent heat exchanger housed in the housing space; a vaporizing cloth housed in the housing space for vaporizing moisture in the drain generated in the latent heat exchanger;
With
The cover panel has a drain vaporization air supply port for supplying drain vaporization air to be supplied to the vaporization cloth from the outside of the accommodation space, and the drain vaporization air and moisture in the vaporized drain And both a drain vaporizing exhaust port for discharging the outside of the housing space ,
The cover panel is provided with pressure receiving pieces so that both the pressure near the drain vaporization inlet and the pressure near the drain vaporization outlet become positive pressure or negative pressure,
The cylindrical cloth for vaporization which has the inflow port connected with the above-mentioned drain vaporization supply port, and the outflow port which communicates with the above-mentioned drain vaporization exhaust port, and is penetrated with the drain generated by the above-mentioned latent heat exchanger A drain vaporizing case for accommodating the gas is provided in the accommodating space;
The hot water supply, characterized in that the inside of the cylindrical vaporizing cloth is part of a flow path of the drain vaporizing air flowing from the drain vaporizing air supply port to the outlet port. apparatus.

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