JP4272214B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater, and more particularly to a water heater provided with a latent heat recovery type heat exchanger.

The water heater shown in FIG. 3 is provided with a sensible heat recovery type sensible heat exchanger (11) and a latent heat recovery type latent heat exchanger (12) as a heat exchanger in the appliance body (1). This is a so-called condensing type water heater in which latent heat is also absorbed by the latent heat exchanger (12) after the sensible heat of the combustion exhaust is absorbed by the sensible heat exchanger (11) (see Patent Document 2). ).
In this, a sensible heat exchanger (11) is provided below the latent heat exchanger (12), and a gas supply pipe (33) is provided further below the sensible heat exchanger (11). A gas burner (19) for burning the gas to be burned is provided. The sensible heat exchanger (11), the latent heat exchanger (12), and the gas burner (19) are accommodated in the casing (13), and the sensible heat exchanger (11) and the latent heat exchanger ( 12) is divided vertically by a drain guide (34) disposed between them.

A blower fan (14) for supplying air sucked from the outside to the gas burner (19) as combustion air is provided below the casing (13).
The sensible heat exchanger (11) and the latent heat exchanger (12) communicate with each other via the exhaust inlet (10), and the combustion exhaust that has passed through the latent heat exchanger (12) From the exhaust outlet (18) of the exchanger (12), through the exhaust passage (17), and discharged from the exhaust port (3) of the casing (13) to the outside of the instrument.
The sensible heat exchanger (11) is provided with a first water pipe (11a) made of copper, and the latent heat exchanger (12) is provided with a second water pipe made of corrosion-resistant titanium or stainless steel ( 12a) is provided.

  The upstream end of the second water pipe (12a) is connected to the water pipe (31) for guiding cold water from a water supply source such as a water pipe, and the downstream end is connected to the upstream end of the first water pipe (11a). ing. Cold water from the water supply pipe (31) is heated by the latent heat exchanger (12) and the sensible heat exchanger (11) while passing through the second water pipe (12a) and the first water pipe (11a). It becomes hot water and is sent from the hot water outlet pipe (32) to which the downstream end of the first water pipe (11a) is connected to a carran or the like in a bathroom or kitchen.

  In this type of water heater, combustion exhaust is generated by combustion of the gas burner (19), and the sensible heat exchanger (11) and the latent heat exchanger (12) are heated by this combustion exhaust, and the sensible heat exchanger (11 ) Absorbs the sensible heat of the combustion exhaust gas, and the latent heat exchanger (12) absorbs the latent heat from the combustion exhaust gas after the sensible heat is absorbed. At this time, the water vapor in the combustion exhaust gas is condensed, so that drain is generated in the latent heat exchanger (12).

Drain (D) generated in the latent heat exchanger (12) is collected from the drain guide (34) to the drain receiver (16), and via the drain discharge pipe (15), the drain recovery device (30) And is neutralized in the drain recovery device (30) and then discharged to the outside.
JP 2002-267153 A JP 2004-198065 A

  In the conventional condensing type water heater as described above, the casing (13) and the like inside the appliance main body is made of stainless steel in order to prevent corrosion due to strongly acidic drain. For this reason, the driving sound of the motor of the blower fan (14), the combustion sound of the gas burner (19), and the sound associated with the Karman vortex formed in the exhaust flow reverberate in the instrument body, and the exhaust port ( It is emitted as noise from 3).

  In order to reduce noise, it is conceivable to install a sound absorbing material in the exhaust passage (17) leading to the exhaust port (3), but to install the sound absorbing material, the entire exhaust passage (17) must be enlarged. In addition, it becomes complicated and expensive. Furthermore, the sound absorbing material is easily corroded by the adhesion of the drain, resulting in problems such as durability problems and a decrease in sound absorption rate.

  As other means for reducing noise without providing a sound absorbing material, an exhaust passage (17) is provided obliquely so that exhaust from the latent heat exchanger (12) is smooth, or an exhaust passage (17 ) May be narrowed.

  However, if the exhaust passage (17) is inclined, the drain easily flows into the exhaust passage (17) together with the combustion exhaust, and if the width of the exhaust passage (17) is narrowed, the exhaust flow through the exhaust passage (17) becomes faster. Therefore, the drain in the latent heat exchanger (12) is wound up into the exhaust passage (17) by the exhaust flow. That is, in the structure in which the exhaust passage (17) is inclined or narrowed, there is a problem that strongly acidic drain before neutralization is scattered from the exhaust port (3) to the outside of the instrument.

  The present invention is “a heat exchange chamber having an exhaust inlet and an exhaust outlet and provided with a water pipe, and an exhaust that houses the heat exchange chamber and exhausts the combustion exhaust that has passed through the heat exchange chamber. In a water heater provided with a latent heat recovery type latent heat exchanger comprising a casing having an opening, and an exhaust passage connecting the exhaust outlet of the heat exchange chamber and the exhaust outlet of the casing in a communicating state. An object of the present invention is to make it possible to suppress noise leaking from the exhaust port to the outside without scattering the drain from the exhaust port.

(1) The water heater of the invention according to claim 1 is: "The exhaust port is positioned above the exhaust outlet;
The exhaust passage is formed between an upper guide plate that diagonally connects the upper side of the exhaust outlet and the upper side of the exhaust port, and a lower guide plate that diagonally connects the lower side of the exhaust outlet and the lower side of the exhaust port. And
Bending the upstream end of the upper guide plate upward to form a flange along the upper side of the exhaust outlet, and positioning the upper side of the exhaust outlet in a non-contact state in the flange;
A drain discharge opening is formed at the upstream end of the lower guide plate ”.
The technical means operates as follows.
The latent heat exchanger has a configuration in which a heat exchange chamber provided with a water pipe and an exhaust passage communicating with an exhaust outlet of the heat exchange chamber are accommodated in a casing, and the casing, a sensible heat exchanger, Along with the drain recovery device and the like, it is accommodated in the appliance main body of the water heater.

  Since the upper guide plate is disposed in a non-contact state with the constituent wall above the exhaust outlet of the heat exchange chamber, it is in a thermally insulated state. Therefore, there is no temperature difference between the upper guide plate and the exhaust gas flowing along the upper guide plate, so that no drain adheres to the upper guide plate. In addition, the upper guide plate has an upper end formed with a flange that opens upward, and the lower guide plate has an opening at the upstream end so that the drain generated in the heat exchange chamber Among these, the drain adhering to the constituent wall above the exhaust outlet accumulates on the flange from the upper side of the exhaust outlet, and the drain adhering to other parts falls to the bottom surface of the heat exchange chamber, and then the opening of the lower guide plate Is discharged to the outside. As described above, the drain generated in the heat exchange chamber is not introduced into the exhaust passage located between the upper and lower guide plates by being introduced into the combustion exhaust. Therefore, even when the exhaust passage is inclined by the vertical guide plate that connects the exhaust outlet and the exhaust port diagonally to achieve a smooth flow of combustion exhaust, the interval between the vertical guide plates is set to be relatively narrow. Even when the flow rate of the exhaust gas passing through the exhaust passage becomes faster by narrowing the passage width of the exhaust passage, the drain does not enter the exhaust passage, and therefore does not scatter to the outside from the exhaust port.

(2) The hot water heater of the invention according to claim 2 is the water heater according to claim 1, wherein an exhaust guide portion that descends obliquely toward the exhaust outlet is provided in an upper region of the exhaust outlet in the heat exchange chamber. The combustion exhaust in the heat exchange chamber descends obliquely downward toward the exhaust outlet along the exhaust guide plate, then rises obliquely upward from the exhaust outlet to the upper and lower guide plates, and from the exhaust port. Since it is discharged, the flow of exhaust gas becomes smoother.

(3) The water heater of the invention according to claim 3 is the above-described invention, wherein both ends in the width direction of the upper guide plate are in close contact with inner walls on both sides of the casing, In the case where notches penetrating upward and downward are formed, the drain accumulated in the flange portion of the upper guide plate is from the notches formed at both end portions of the upper guide plate that are in close contact with the inner walls on both sides of the casing. Since it falls along the inner walls on both sides of the casing, it does not enter the exhaust passage.

(4) The water heater of the invention according to claim 4 in the above inventions, wherein “the distance between the downstream end of the upper guide plate and the downstream end of the lower guide plate is set to 16 mm or less” Then, the upper guide plate and the lower guide plate can be disposed so as to become narrower toward the downstream end so that the distance between the downstream ends is 16 mm or less.

(5) The water heater of the invention according to claim 5 is the above-mentioned invention, wherein an exhaust top for exhausting combustion exhaust from the instrument body to the outside is provided on the outer surface of the casing corresponding to the exhaust port. In the exhaust top, an extension passage communicating with the exhaust passage and inclined obliquely upward toward the open end of the exhaust top is formed in the exhaust top. By adopting a configuration in which the extended passage to be provided is separable, it is possible to implement the exhaust passage by the upper and lower guide plates even for instruments having different exhaust top shapes. In addition, by adopting a configuration in which the extension passage is inclined obliquely upward toward the outside, the flow of the exhaust gas becomes smoother and the drain can be reliably prevented from scattering to the outside.

  As described above, according to the first aspect of the invention, since the drain generated in the heat exchange chamber does not enter the exhaust passage, the exhaust passage is inclined and set narrower than the conventional one. The structure to do is possible. By making the exhaust passage incline, the combustion exhaust flows smoothly, and by setting the exhaust passage narrow, the combustion sound of the gas burner, the driving sound of the blower fan, and the sound generated by the Karman vortex, etc. It is possible to suppress the combustion noise that echoes and leaks from the exhaust port to the outside of the instrument body. Further, since no sound absorbing material is used, it is possible to provide an inexpensive and durable low noise structure.

According to the invention which concerns on Claim 2, since the flow until combustion exhaust_gas | exhaustion in a heat exchange chamber is discharged | emitted becomes smoother, the noise which arises in an instrument main body can be suppressed further.
According to the third aspect of the present invention, the drain accumulated in the flange portion on the upper surface of the upper guide plate can be discharged along the inner walls on both sides of the casing. It can be discharged outside the heat exchange chamber.

  According to the invention which concerns on Claim 4, since a vertical guide plate can be arrange | positioned so that it may become narrow toward a downstream end, the silencing effect becomes certain. Further, by setting the distance between the downstream ends to 16 mm or less, it is possible to prevent small birds such as sparrows and small animals from entering the casing from the exhaust port.

  According to the invention which concerns on Claim 5, it becomes employable also to the casing from which the shape of an exhaust top differs. Further, by adopting a configuration in which the extension passage is inclined obliquely upward toward the outside, the flow of the exhaust gas becomes smoother and the distance from the sound source in the instrument body to the open end of the exhaust top is the length of the extension passage. Therefore, the noise reduction can be further promoted.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
The hot water heater according to the embodiment of the present invention is of a type provided with a so-called condensing boiler that absorbs sensible heat and latent heat of combustion exhaust gas as in the conventional example.

  As shown in FIG. 1, a sensible heat exchanger (11) and a latent heat exchanger (12) are accommodated in the instrument body (1), and a sensible heat exchanger (11) is disposed above the sensible heat exchanger (11). A gas burner (19) is provided below the gas burner, and a blower fan (14) for supplying combustion air to the gas burner (19) is provided below the gas burner. A drain recovery device (30) containing a neutralizing agent is provided via a drain discharge pipe (15).

The sensible heat exchanger (11) is provided with a first water pipe (11a) made of a copper pipe in a meandering manner, and the latent heat exchanger (12) is made of a titanium or stainless steel pipe. The second water pipe (12a) is arranged in a meandering manner. The upstream end of the second water pipe (12a) is connected to a water pipe (31) through which cold water from a water supply source such as a water supply pipe or a return pipe of a hot water heater is led, and the downstream end is the first water pipe. It is connected to the upstream end of (11a). The downstream end of the first water pipe (11a) guides the hot water heated by the sensible heat exchanger (11) and the latent heat exchanger (12) to the bathroom, kitchen currant, hot water heater, etc. Connected to the tap pipe (32).
The latent heat exchanger (12) is accommodated in the first casing (22), and a second casing (21) for accommodating the sensible heat exchanger (11) and the gas burner (19) is provided below the latent heat exchanger (12). It is arranged.
In this embodiment, the first casing (22) corresponds to the casing described as the invention specific matter.

The first casing (22) and the second casing (21) communicate with each other on the rear side (right side in the drawing) of the instrument body (1).
An exhaust guide plate (23) that descends obliquely toward the front (left side in the drawing) of the instrument body (1) is provided in the upper area on the front side in the first casing (22). A drain guide (24) made of an inclined plate descending toward the front is disposed along the bottom surface of the casing (22).

  That is, the latent heat exchanger (12) of the water heater according to the embodiment of the present invention includes an exhaust guide plate (23) provided in the first casing (22), and the subsequent first casing (22). A range surrounded by a part of the ceiling and the drain guide (24) is defined as a heat exchange chamber (2), and a second water pipe (12a) is disposed in the heat exchange chamber (2). An exhaust inlet (25) through which combustion exhaust from the second casing (21) is fed into the heat exchange chamber (2) is provided behind the drain guide (24), and an exhaust guide plate (23) An exhaust outlet (26) for exhausting the combustion exhaust from the heat exchange chamber (2) is provided between the lower end (23a) of the drain and the front end of the drain guide (24). The exhaust outlet (26) of the heat exchange chamber (2) and the exhaust outlet (20) of the first casing (22) communicate with each other via the exhaust passage (4). ) Is discharged from the exhaust outlet (26) to the outside of the first casing (22) through the exhaust passage (4) and from the exhaust port (20).

The exhaust port (20) opens in a horizontally long rectangular shape at a position higher than the exhaust outlet (26), and the exhaust passage (4) has a lower end ( 23a) to the upper side of the exhaust port (20) and the upper guide plate (41) that rises diagonally toward the exhaust port (20) and the lower end of the exhaust port (20) from the front end of the drain guide (24) And the lower guide plate (42) that rises obliquely toward the exhaust port (20). Both ends in the width direction of the upper and lower guide plates (41) and (42) are set to a length that is in close contact with both inner walls of the first casing (22), and although not shown, the upper guide plates (41) A cutout penetrating upward and downward is formed at both ends.
The downstream ends of the upper and lower guide plates (41) and (42) are fixed to the upper and lower sides of the exhaust port (20), respectively.

The horizontal length of the drain receiving portion (16) is also set to be approximately equal to the horizontal length of the first casing (22).
The upstream end of the upper guide plate (41) is bent upward to form a flange (40), and the lower end (23a) of the exhaust guide plate (23) is not in the flange (40). Housed in contact. As a result, the upper guide plate (41) is insulated from the exhaust guide plate (23), which is the constituent wall of the heat exchange chamber (2).

  In the central area of the lower guide plate (42), an opening (43) that opens downward (upstream end side) is formed, and an extension piece (44) extending on both sides of the opening (43) (44) is welded in the vicinity of the left and right front ends of the drain guide (24).

  On the outer surface of the first casing (22) corresponding to the exhaust port (20), an exhaust top (27) for exhausting combustion exhaust from the instrument body (1) to the outside is mounted, and the instrument body (1) The open end (28) of the exhaust top (27) is exposed at the front of the.

  In the exhaust top (27), inclined plates (51) (52) corresponding to the downstream ends of the upper and lower guide plates (41) (42) and rising toward the exhaust port (1a) of the instrument body (1), respectively. ) Is formed. The upper and lower inclined plates (51) and (52) and the upper and lower guide plates (41) and (42) are not connected to each other and can be separated.

The flow of combustion exhaust and the recovery of drain in the water heater of this embodiment will be described.
When a water flow is detected by a water amount sensor (not shown), the blower fan (14) is activated and combustion air is sent to the gas burner (19), which burns the gas burner (19) and generates combustion exhaust. Is done. The sensible heat exchanger (11) and the latent heat exchanger (12) are heated by the combustion exhaust.
The combustion exhaust is absorbed into the heat exchange chamber (2) of the latent heat exchanger (12) through the exhaust inlet (25) while sensible heat is absorbed by the sensible heat exchanger (11), and Latent heat is absorbed. At this time, drain (D) is generated in the heat exchange chamber (2) and adheres to the inner wall surface of the heat exchange chamber (2) and the second water pipe (12a). These drains (D) drop on the drain guide (24) and flow forward along the slope of the drain guide (24), and as shown by the two-dot chain line in FIG. ) Through the opening (43) and collected in the drain receiving part (16) and collected in the drain collecting device (30) through the drain discharge pipe (15). The drain (D) recovered in the drain recovery device (30) is neutralized and then discharged to the outside of the instrument body (1).

  That is, the drain (D) dripped on the drain guide (24) enters the exhaust passage (4) or rolls up in the exhaust passage (4) along with the combustion exhaust passing through the exhaust passage (4). Without being collected, it is surely collected in the drain receiving part (16) and discharged.

  Further, the drain (D) adhering to the inner surface of the exhaust guide plate (23) is dropped into the flange portion (40) from the lower end (23a) of the exhaust guide plate (23) and is accumulated in the flange portion (40). When the drain (D) accumulated in the collar part (40) reaches the left and right ends of the upper guide plate (41), the drains (D) pass through the inner walls on both sides of the first casing (22) from the notches provided at both ends. Then it flows down and is collected in the drain receiving part (16) below.

  As described above, the drain (D) generated in the heat exchange chamber (2) adheres to the exhaust guide plate (23) from the flange (40) of the upper guide plate (41) to the first casing. The material that has flowed through the both side walls of (22) to the drain receiving portion (16) and dropped onto the drain guide (24) is discharged from the opening (43) of the lower guide plate (42). Therefore, almost all of the drain (D) generated in the heat exchange chamber (2) does not enter the exhaust passage (4) and enters the drain receiving portion (16). ) And then recovered to the drain recovery device (30) via the drain discharge pipe (15).

  Combustion exhaust sent from the sensible heat exchanger (11) through the exhaust inlet (25) into the heat exchange chamber (2) of the latent heat exchanger (12) passes along the exhaust guide plate (23). After being lowered obliquely downward on the front side, the exhaust passage (4) and the extension passage (5) are obliquely raised through the exhaust outlet (26) and from the open end (28) of the exhaust top (27). It is discharged outside the instrument body (1). Thus, by arranging the exhaust guide plate (23), the exhaust passage (4), and the extension passage (5) obliquely, the flow of the combustion exhaust becomes smooth, and in the latent heat exchanger (12). Since the sound that reverberates and the noise generated by the Karman vortex and the like are suppressed, the sound leaking from the open end (28) of the exhaust top (27) to the outside of the instrument body (1) can be reduced.

  Further, in the exhaust passage (4) of this embodiment, the inclination degree of the upper and lower guide plates (41) and (42) is set to be predetermined so that the downstream end is narrower than the upstream end. The distance between the downstream ends of (41) and (42), that is, the distance between the exhaust ports (20) is set to 16 mm, which is a size in which small birds such as sparrows and small animals cannot enter. As described above, by setting the exhaust passage (4) to be narrower than that of the conventional one, it is possible to suppress leakage of noise that reverberates in the instrument body (1) to the outside.

  Normally, when the exhaust passage (4) is inclined, the internal drain easily enters the exhaust passage (4), and when the exhaust passage (4) is narrowed, the flow of the combustion exhaust gas passing through the exhaust passage (4) However, in the exhaust passage (4) of the above embodiment, as described above, the upper guide plate (41) has the flange portion (40) in the exhaust passage (4). And the opening (43) in the lower guide plate (42) makes it difficult for the drain to enter the exhaust passage (4). Therefore, as described above, the structure of the exhaust passage (4) can be made narrow and the combustion exhaust gas can flow smoothly, and the noise generated from the instrument body (1) can be kept low.

  Furthermore, in this embodiment, since the extension passage (5) provided in the exhaust top (27) and the exhaust passage (4) are configured to be separable, the instrument main body with a different shape of the exhaust top (27) ( Also in 1), the structure of the exhaust passage (4) of the embodiment of the present invention can be adopted. Also, by inclining the extension passage (5) following the exhaust passage (4), the flow of combustion exhaust to the open end (28) of the exhaust top (27) becomes smoother, and the instrument body (1) Noise that leaks to the outside is further suppressed. Even if drain may enter the exhaust passage (4), the extension passage (5) is further extended from the exhaust port (20), so that the drain is scattered outside the instrument body (1). This can be prevented more reliably.

The block diagram which shows the whole water heater of embodiment of this invention. The principal part expanded sectional view of the water heater of embodiment of this invention. Explanatory drawing of the conventional water heater.

Explanation of symbols

(12) ... Latent heat exchanger
(12a) ... Water pipe
(16) ... Drain receiving part
(2) ・ ・ ・ ・ Heat exchange room
(20) ... Exhaust port
(21) ... Second casing
(22) ... First casing
(25) ... Exhaust inlet
(26) ・ ・ ・ ・ Exhaust outlet
(4) ・ ・ ・ ・ Exhaust passage
(41) ... Upper guide plate
(42) ... Lower guide plate
(43) ・ ・ ・ ・ Opening

Claims (5)

A heat exchange chamber having an exhaust inlet and an exhaust outlet and having a water pipe disposed therein, and an exhaust port for accommodating the heat exchange chamber and exhausting the combustion exhaust that has passed through the heat exchange chamber to the outside are opened. A water heater comprising a latent heat recovery type latent heat exchanger comprising: a casing having an exhaust passage that connects the exhaust outlet of the heat exchange chamber and the exhaust outlet of the casing in a communicating state;
The exhaust port is positioned above the exhaust outlet;
The exhaust passage is formed between an upper guide plate that diagonally connects the upper side of the exhaust outlet and the upper side of the exhaust port, and a lower guide plate that diagonally connects the lower side of the exhaust outlet and the lower side of the exhaust port. And
Bending the upstream end of the upper guide plate upward to form a flange along the upper side of the exhaust outlet, and positioning the upper side of the exhaust outlet in a non-contact state in the flange;
A water heater, wherein an opening for draining is formed at an upstream end of the lower guide plate.   2. The water heater according to claim 1, wherein an exhaust guide portion that descends obliquely toward the exhaust outlet is provided in an upper area of the exhaust outlet in the heat exchange chamber.   3. The water heater according to claim 1, wherein both end portions in the width direction of the upper guide plate are in close contact with inner walls on both sides of the casing, and notches penetrating upward and downward are formed in the both end portions. Water heater characterized by being.   The water heater according to any one of claims 1 to 3, wherein a distance between a downstream end of the upper guide plate and a downstream end of the lower guide plate is set to 16 mm or less. .   In the water heater according to any one of claims 1 to 4, an exhaust top for exhausting combustion exhaust from the instrument body to the outside is mounted on the outer surface of the casing corresponding to the exhaust port, An extension passage that is communicated with the exhaust passage and inclined obliquely upward toward the open end of the exhaust top is formed in the exhaust top.

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