JP6803059B2 - Water heater - Google Patents

Description

The present invention relates to a water heater that heats water passing through a heat exchanger with a burner to discharge hot water.

The water heater has a burner and a heat exchanger that exchanges heat with the combustion exhaust of the burner in the housing, and the water inlet pipe and the hot water outlet pipe are connected to the heat exchanger, respectively, and the heat exchanger is connected from the water inlet pipe. The passing water is heated by the combustion exhaust of the burner and discharged from the hot water outlet pipe. In addition, a bypass pipe that bypasses the heat exchanger is connected between the water inlet pipe and the hot water outlet pipe, and the amount of water supplied from the water inlet pipe is detected on the upstream side of the connection portion of the water inlet pipe with the bypass pipe. A water amount sensor and a water throttle motor for controlling the amount of water are provided, and the bypass pipe is provided with a mixing motor for controlling the amount of water flowing through the bypass pipe.

In the bypass mixing type water heater, the connecting portion between the water inlet pipe and the bypass pipe may be configured as a water side component separate from the water inlet pipe and the bypass pipe and incorporated in the housing. That is, an upstream path portion having a total amount throttle portion connected to a water inlet on the housing side and equipped with an actuator such as a water amount sensor and a stepping motor for adjusting the amount of water, and a branch from the upstream path portion thereof, upstream of the water inlet pipe. Water containing a first path portion connected to the end and a second path section connected to the upstream end of the bypass pipe and having a bypass throttle portion also provided with an actuator such as a stepping motor to adjust the amount of water to the bypass pipe. In a water heater equipped with this water side component, which is a side component, the total amount of water supplied to the water heater is limited by controlling the total amount throttle, and the amount of water that exceeds the combustion capacity of the water heater is supplied. Can be prevented. In addition, by controlling the bypass throttle, the amount of water flowing to the heat exchanger side is adjusted, and if the outlet temperature of the heat exchanger fluctuates, the amount of water to the bypass pipe is adjusted to keep the inner body temperature constant. Can be kept.

Japanese Patent No. 5872963

By the way, in addition to piping such as a water pipe, components such as a burner device, a gas supply device, an electrical board, and a pump are densely arranged inside the housing. On the other hand, according to the custom of the gas appliance industry, the water inlet is often arranged near the center of the housing, so that the water side parts are also often arranged near the center of the lower part of the housing.
Therefore, when arranging the water side parts at the time of manufacturing the water heater, the upstream side path portion is first connected to the water inlet to position the water side parts, and then the water inlet pipe is the first path portion and the bypass pipe is the first. It is the work of connecting to each of the two bypass sections. However, as described above, since the components are densely packed inside the housing, the workability is poor and the productivity is lowered. In addition, since the water inlet pipe and the bypass pipe are lifted and inserted so as to face each path portion, the water inlet pipe and the bypass pipe may be stressed.
Furthermore, since the water-side parts have actuators such as stepping motors, maintenance is relatively frequent, and at that time, it is troublesome to insert and remove the water inlet pipe and bypass pipe from the narrow space inside the housing. It has become. This deterioration in maintainability is becoming more and more apparent as the housing becomes more compact in recent years.

Therefore, an object of the present invention is to provide a water heater capable of facilitating the work of assembling and removing the water-side component to the housing and improving the productivity and maintainability.

In order to achieve the above object, the invention according to claim 1 has a housing in which a water inlet and a hot water outlet are provided at the bottom and the front opening is closed by a removable cover, and the housing is housed inside the housing. A water inlet pipe whose downstream end is connected to the upstream end of the heat exchanger, a hot water pipe connected between the downstream end of the heat exchanger and the hot water outlet, and a hot water pipe. Including a bypass pipe to which the downstream end is connected to, and a water side component connecting the upstream end of the water inlet pipe and the upstream end of the bypass pipe , the water side component is connected to the water inlet and a water volume sensor. and an upstream path portion having a total amount throttle portion for adjusting the amount of water, is connected to the upstream end of the water inlet pipe, a first path portion capable of supplying water having passed through the upstream path portion to the water inlet pipe, a bypass pipe It is connected to an upstream end provided with a bypass throttle portion for adjusting the amount of water to the bypass pipe, a water heater of water passing through the upstream path portion formed by perforated and a second path portion can be supplied to the bypass pipe ,
The water inlet pipe is divided into a first water inlet pipe on the upstream side connected to the first path portion of the water side component and a second water inlet pipe on the downstream side connected to the heat exchanger. The downstream end and the upstream end of the second water pipe are separably connected by a first clip member that elastically engages with both.
The bypass pipe is divided into a first bypass pipe on the upstream side connected to the second path portion of the water side component and a second bypass pipe on the downstream side connected to the hot water discharge pipe, and is downstream of the first bypass pipe. The end and the upstream end of the second bypass pipe are separably connected by a second clip member that elastically engages with both ends.
In the invention according to claim 2, in the configuration of claim 1, the upstream path portion is connected to the water inlet via a tubular joint member connected to the water inlet, and is connected to the downstream end of the joint member. The upstream path portion is separably connected by a third clip member that elastically engages with both.
According to the third aspect of the present invention, in the configuration of the first or second aspect, the second water inlet pipe and the second bypass pipe are located in the front and rear of the housing in the depth direction and are arranged downward, respectively, and are water side components. The first path portion and the second path portion of the above are formed toward the opening side of the housing, respectively, the actuator of the bypass throttle portion is arranged on the upper side of the second path portion, and the first water pipe is directed to the opening side. After extending, it is bent upward and connected to the second water inlet pipe by the first clip member, and the first bypass pipe is bent upward on the opening side of the actuator and the second bypass is performed by the second clip member. It is characterized by being connected to a pipe.

According to the first aspect of the present invention, by attaching / detaching the first and second clip members, the work of assembling and removing the water side component to the housing can be easily performed. Therefore, it leads to improvement of productivity and maintainability. In particular, since the water inlet pipe and the bypass pipe are separated and one of them is integrated with the water side component, it is possible to smoothly connect and disconnect the water inlet pipe and the bypass pipe, and unnecessary stress is applied to each pipe. There will be no such thing.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the third clip in which the downstream end and the upstream path portion of the joint member connected to the water inlet elastically engage with each other. Since the members are separably connected, the water-side parts can be removed more smoothly.
According to the invention of claim 3, in addition to the effect of claim 1 or 2, a first water pipe and a first bypass pipe are piped on the front side of the actuator to form a second water pipe and a second bypass pipe, respectively. Since they are connected, the water side component can be formed in a space-saving manner, and the water side component can be easily removed without interfering with other components.

It is a perspective view from the bottom of the bath water heater. It is a front view with the front cover removed. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 2 is a front view showing a state in which the lower cover and the surface sensor are removed. It is a perspective view of a water side component. It is a perspective view from the lower part of the inner body. It is explanatory drawing which shows the state which took out the water side part. It is a perspective view of a cradle. (A) is an enlarged view of the pedestal portion in FIG. 2, and (B) is an enlarged view of the pedestal portion in FIG. It is a perspective view from the bottom of the exhaust hood. It is a central vertical sectional view of the exhaust hood part. It is an exploded perspective view of the exhaust hood (excluding the reinforcing flange plate). It is the bottom view of the exhaust hood which omitted the reinforcing flange plate. It is an exploded perspective view of the exhaust hood which shows the reinforcing flange plate separated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a bath water heater which is an example of a water heater, FIG. 2 is a front view with the front cover removed, and FIG. 3 is a sectional view taken along line AA of FIG. The bath water heater 1 has a housing 2 having five surfaces excluding the front surface surrounded by a top plate 3, a bottom plate 4, left and right side plates 5, 5, and a back plate 6, and an opening 7 on the front surface of the housing 2. A detachable front cover 8 for closing is provided. An exhaust stack 9 extending in the left-right direction projects from the upper portion of the front cover 8, and intake ports 10, 10, ... Are formed at the lower portion. The bottom plate 4 has a hot water outlet 11 connected to an external hot water tap, a water inlet 12 to which a water pipe is connected from the outside, a gas inlet 13 to which a gas pipe is connected from the outside, an outlet 14 connected to a bathtub, and a return port 15. Each is provided. Reference numerals 16 and 16 are wall-mounting metal fittings provided above and below the back plate 6.

Inside the housing 2, an inner body 17 is provided at the upper part. The inner body 17 is installed in the order of the burner unit 18, the heat exchanger 19, and the exhaust hood 20 from the bottom.
First, the burner unit 18 has a lower casing 21 that communicates with the heat exchanger 19, and a first burner group for hot water supply and a second burner group for reheating a bath (not shown) are located below the lower casing 21. The first burner group is arranged side by side in the left-right direction (here, the first burner group is on the right side in FIG. 2 and the second burner group is on the left side). On the front side of the lower casing 21, a nozzle base 22 that is installed toward the rear end of the mixing pipe provided in each burner and supports a nozzle (not shown) connected to the gas inlet 13 via the gas pipe is provided. There is. Reference numeral 23 denotes an upper cover that covers the front side of the nozzle base 22, and 24 is a lower cover that covers the piping side and partitions the wiring below it. Below the burner unit 18, combustion air is supplied to each burner group. An air supply fan 25 (FIG. 4) is provided.

Next, the heat exchanger 19 has a square tubular inner casing 26 that communicates with the lower casing 21, and in the inner casing 26, a hot water supply side heat exchanger located above the first burner group and a second hot water supply side heat exchanger. The bath side heat exchangers located above the burners are arranged side by side in the left-right direction. Inside the lower casing 21 and the middle casing 26, a partition member (not shown) for partitioning between the first burner group and the second burner group and between the hot water supply side heat exchanger and the bath side heat exchanger is used. It is divided into a first combustion chamber on the right side where the 1 burner group and the hot water supply side heat exchanger are arranged, and a second combustion chamber on the left side where the 2nd burner group and the bath side heat exchanger are arranged.

As shown in FIG. 11, the hot water supply side heat exchanger and the bath side heat exchanger penetrate the fins 28, 28, which are laminated in the front-rear direction at predetermined intervals, in the front-rear direction, and inside the inner casing 26. It has a plurality of heat transfer tubes 27, 27 ... Arranged in parallel. Adjacent heat transfer tubes 27, 27 are connected to each other in a meandering manner for each heat exchanger by being alternately connected to each other in the front and rear by U-shaped connecting tubes 29, 29 ... Outside the inner casing 26. It is a tube. A bimetal switch 30 for detecting empty heating is provided on the connecting pipe 29 of each heat exchanger. Reference numeral 31 denotes a surface sensor that detects damage to the inner casing 26.

Further, the downstream end of the water inlet pipe 32 connected to the water inlet 12 via the water side component 40 described later is connected to the upstream end of the pipe body of the hot water supply side heat exchanger, and is connected to the downstream end of the pipe body. , The hot water pipe 33 connected to the hot water outlet 11 is connected. Further, a bypass pipe 34 that bypasses the hot water supply side heat exchanger is connected between the water side component 40 and the hot water outlet pipe 33.
On the other hand, an outgoing pipe 35 connected to the outgoing port 14 is connected to the downstream end of the tube body of the bath side heat exchanger, and a return tube 36 connected to the return port 15 is connected to the upstream end of the tubular body. It is connected. Reference numeral 37 denotes a pump for circulating a bath, and a drop pipe 38 connected to the outgoing pipe 35 and for filling the bathtub with the hot water of the hot water pipe 33 is branched and connected to the hot water discharge pipe 33.

(Explanation of water side parts)
The water inlet 12, the upstream end of the water pipe 32, and the upstream end of the bypass pipe 34 are branched and connected via the water side component 40.
As shown in FIG. 5, the water side component 40 is connected to the upstream side path portion 41 connected to the water inlet 12, and the first path connected to the downstream side of the upstream side route portion 41 and connected to the water inlet pipe 32. It has a three-pronged structure having a section 42 and a second path section 43 that is branched and connected to the upstream path section 41 and connected to the bypass pipe 34.
First, the upstream side path portion 41 includes a downward cylinder 45 provided with a water amount sensor 46 in a total amount throttle portion 44 provided with a water amount control valve in the internal flow path, and a forward cylinder 47 connected to the first path portion 42. The first stepping motor 48 is provided in the total amount throttle portion 44, and the opening degree of the water amount control valve (the flow path area of the total amount throttle portion 44) is continuously increased. It can be changed.

The first path portion 42 is a forward-facing pipe body connected to the forward-facing cylinder 47 of the upstream route portion 41, and the water inlet pipe 32 is connected thereto. The water inlet pipe 32 here is the first route portion 42. It is divided into a first water pipe 32A on the upstream side connected to the hot water supply side and a second water pipe 32B on the downstream side connected to the hot water supply side heat exchanger as shown in FIG.
The lower end of the first water inlet pipe 32A has an L-shape that is bent upward after being connected to the first path portion 42 and extending forward, and the lower end is screwed to the first path portion 42. It is fixed to the first path portion 42 by the fixing metal fitting 49 in a retaining state. First locking flanges 50, 50 are provided around the outer periphery of the upper end.
On the other hand, at the lower end of the second water inlet pipe 32B, a large diameter portion 51 into which the first locking flanges 50 and 50 and the upper end of the first water inlet pipe 32A can be fitted is formed, and at the lower end of the large diameter portion 51, a second A locking flange 52 is provided around the circumference.

The upper end of the first water pipe 32A is inserted into the large diameter portion 51 of the second water pipe 32B together with the first locking flanges 50 and 50 via a seal member (not shown), and in this state, the first water pipe 32A is engaged across both pipes. The first and second water inlet pipes 32A and 32B are connected by using the clip member 53 to stop (hereinafter, referred to as "first clip member 53A" when distinguishing from other clip members). The clip member 53 has the same structure as that used for the bypass pipe 34 and the upstream path portion 41 side, and as shown in the lower side of FIG. 5, the metal strip is bent to the center in the longitudinal direction. A knob portion 54 bent in a U shape, a pair of clamp portions 55 and 55 curved to match the outer shape of the water inlet pipe 32 on both sides of the knob portion 54, and each other at the tips of the clamp portions 55 and 55. The folded portions 56 and 56 that are bent in the opposite directions are formed so that the clamp portions 55 and 55 can be elastically deformed in the expanding direction. Then, a locking slit 57 extending in the longitudinal direction is formed over each clamp portion 55 and the folded portion 56.

The locking slit 57 is in a state where the upper end of the first water pipe 32A is inserted into the large diameter portion 51 of the second water pipe 32B and elastically sandwiched by the clamp portions 55 and 55 of the clip member 53 in the width direction. By locking one inner edge to the first locking flange 50 and the other inner edge to the second locking flange 52, both locking flanges 50 and 52 are locked in the locking slit 57, and the pipes are connected to each other. It is intended to prevent the Here, since the outer diameter of the first water pipe 32A and the outer diameter of the large diameter portion 51 of the second water pipe 32B are different, in the clamp portion 55, the radius of curvature is changed on both sides of the locking slit 57. It corresponds to both pipes respectively.

Next, the second path portion 43 includes a bypass throttle portion 58 provided with a bypass amount control valve in the internal L-shaped flow path, and a second stepping motor capable of continuously changing the opening degree of the bypass amount control valve. 59, the upstream end of the flow path is connected to the first path portion 42 from above, and the bypass pipe 34 is connected to the downstream end of the flow path from the front. However, the bypass pipe 34 here is also the first bypass pipe 34A on the upstream side connected to the second path portion 43 and the downstream connected to the hot water discharge pipe 33 as shown in FIG. 6, similarly to the water inlet pipe 32. It is divided into a second bypass pipe 34B on the side.
The lower end of the first bypass pipe 34A is fixed to the downstream end of the second path portion 43 in a retaining state by a fixing metal fitting 60 screwed to the second path portion 43, extends forward from there, and then upwards. It has a bent shape that is bent and the upper end curves backward, and the first locking flanges 61, 61 are provided around the outer periphery of the upper end.

On the other hand, a large diameter portion 62 into which the upper end of the first bypass pipe 34A can be fitted together with the first locking flange 61 is formed at the lower end of the second bypass pipe 34B, and the second locking is performed at the lower end of the large diameter portion 62. A flange 63 is provided around the circumference.
The upper end of the first bypass pipe 34A is inserted into the large diameter portion 62 of the second bypass pipe 34B together with the first locking flange 61 via a seal member (not shown), and in this state, the first bypass pipe 34A is locked across both pipes. By using the clip member 53 (hereinafter, referred to as "second clip member 53B" when distinguishing from other clip members), the first and second water inlet pipes 32A and 32B are used in the same manner as the first and second water inlet pipes 32A and 32B. Bypass pipes 34A and 34B are connected. That is, the clip member 53 is elastically sandwiched across each other's pipes, and the locking slits 57 are locked with the locking flanges 61 and 63 formed at the ends of each other to prevent them from coming off. Is.

A vertical joint cylinder 64 (FIGS. 4 and 5) is interposed to connect the upstream route portion 41 and the water inlet 12, and the lower end of the downward cylinder 45 of the upstream route portion 41 and the joint cylinder 64. A clip member 53 (hereinafter, referred to as "third clip member 53C" when distinguishing from other clip members) is also used for connection with the upper end, and a connection between the water inlet 12 and the lower end of the joint cylinder 64. Also, the clip member 53 is used. That is, the clip member 53 is elastically sandwiched across each other's cylinders, and the locking slits 57 are locked with the locking flanges formed at the ends of the cylinders to prevent them from coming off. It is a thing.

In the water-side component 40 assembled in this way, the first stepping motor 48 is located at the rearmost side (innermost position) in the housing 2, and the forward-facing cylinder 47 and the first path portion 42 of the upstream side path portion 41 are located in front of the first stepping motor 48. Is linearly extended forward, and the second path portion 43 and the second stepping motor 59 are located above the first path portion 42. Then, the first water inlet pipe 32A crosses the front of the first and second path portions 42 and 43 upward, and the first bypass pipe 34A crosses upward behind the first water pipe 32A. That is, the water-side component 40 is housed in the space in the front-rear direction near the lower center of the inner body 17 in the housing 2, and on the upper side of the joint cylinder 64, there are almost no other components in front. There is.
Therefore, when the water side component 40 is taken out for maintenance or the like, the first clip member 53A connecting the first water inlet pipe 32A and the second water inlet pipe 32B, the first bypass pipe 34A, and the second bypass pipe 34B are connected. If the second clip member 53B that connects the second clip member 53B and the third clip member 53C that connects the downward cylinder 45 of the upstream path portion 41 and the joint cylinder 64 are removed, the water side component 40 can be moved forward as it is as shown in FIG. Can be easily pulled out to.

On the contrary, when assembling the water side component 40, if the first stepping motor 48 is pushed into the housing 2 from the front first, it can be positioned at the assembling position as it is. At this assembly position, the upper end of the first water pipe 32A faces the connection direction near the lower end of the second water pipe 32B, and the upper end of the first bypass pipe 34A also faces the connection direction near the lower end of the second bypass pipe 34B and faces downward. Since the cylinder 45 is placed on the joint cylinder 64, it can be smoothly sandwiched and fixed by the clip members 53, respectively.
Here, the upstream side path portion 41 is also locked between the forward-facing cylinder 47 and the first path portion 42 by the clip member 53 with the pipes between them inserted. The 41 and the first path portion 42 can be easily separated and connected.

(Explanation of electrical box)
The electrical box 65 is housed on the right side of the water side component 40 and inside the side plate 5. The electrical box 65 has a square box shape having a small left-right width and a slightly smaller front-rear width than the side plate 5, and a controller 66 made of an electrical board is vertically housed on the inner right side. The controller 66 is provided on the water amount sensor 46 provided on the water side component 40, the first and second stepping motors 48 and 50, the bimetal switch 30, the igniter for burning the burner, the upstream side path portion 41, the hot water pipe, and the like. It is electrically connected to electrical components such as a thermistor 67 for temperature detection, an air supply fan 25, and a pump 37 via wiring.

The lower surface of the electrical box 65 is supported by a pedestal 68 provided on the bottom plate 4, and the upper portion of the electrical box 65 is supported by a connecting plate 69 erected between the cradle 68 and the front surface of the nozzle base 22 of the burner unit 18. Further, a protrusion 70 is formed downward on the lower surface of the electrical box 65, and a retaining pin 71 having a length larger than the left-right width of the protrusion 70 is orthogonally fixed to the protrusion 70. ing.
As shown in FIG. 8, the cradle 68 is bent forward by bending a metal strip to support the upper plate portion 72 in the front-rear direction and the front end of the upper plate portion 72. A front side view U-shaped member having an L-shaped front plate portion 73 and an L-shaped rear plate portion 74 that supports the rear end of the upper plate portion 72 and is bent backward at the lower end. The lower end of the plate portion 73 and the lower end of the rear plate portion 74 are screwed to the bottom plate 4, so that the upper plate portion 72 is fixed in parallel with the bottom plate 4.

Further, the upper plate portion 72 is formed with a slit 75 from the front end to the rear. The slit 75 is formed to have a width larger than the left-right width of the protruding portion 70 of the electrical box 65 and smaller than the length of the retaining pin 71. However, the front end of the slit 75 is formed in a tapered shape that becomes wider toward the front, and the protruding portion 70 including the retaining pin 71 passes through the upper portion of the front plate portion 73 so as to communicate with the front end of the slit 75. A doorway 76 having a possible width is formed.
Therefore, the protruding portion 70 can enter and exit the lower side of the upper plate portion 72 in the front-rear direction by passing through the entrance / exit 76, and the protruding portion 70 is guided by the slit 75 and is located below the upper plate portion 72. Then, the protruding portion 70 is prevented from coming off by the retaining pin 71 that protrudes to the left and right. The electrical box 65 is placed on the cradle 68 in this retaining state.

On the other hand, between the lower casing 21 of the burner unit 18 and the electrical box 65, a pipe through which the water inlet pipe 32, the hot water outlet pipe 33, and the bypass pipe 34 arranged between the inner body 17 and the right side plate 5 pass. The space is 77.
The connecting plate 69 has a V-shaped front view, is shaped to cross the piping space 77 between the water inlet pipe 32 and the hot water outlet pipe 33, and is erected between the nozzle base 22 and the electrical box 65. Specifically, the left end portion is fixed to the front surface of the nozzle base 22 by the screw 78A, and the right end portion is fixed to the back surface of the fixing piece 79 projecting upward from the front plate of the electrical box 65 by the screw 78B. Nozzle. In this state, no other components cross between the electrical box 65 and the front cover 8, and the front of the electrical box 65 is open.

Therefore, when assembling the electrical box 65, if it is inserted from the rear surface so as to be placed on the upper plate portion 72 of the cradle 68 and slid to the back side, the protruding portion 70 becomes the upper plate portion 72 as shown in FIG. It enters the slit 75 of the above and is placed on the cradle 68 in a state where it is prevented from coming off by the retaining pin 71. At this time, on the upper side, the fixing piece 79 comes into contact with the right end portion of the connecting plate 69. Therefore, if the fixing piece 79 is fixed to the right end portion with the screw 78B, the assembling work is completed.
On the contrary, when taking out the electrical box 65, if the screw 78B at the right end of the connecting plate 69 is removed and the fixing with the fixing piece 79 is released, the electrical box 65 is directly placed on the upper plate 72 of the cradle 68. The protrusion 70 can be pulled out by sliding it forward while guiding it to the slit 75. At this time, since the retaining pin 71 can pass through the entrance / exit 76, it does not interfere with the front plate portion 73. When the nozzle base 22 is to be maintained, only the screw 78A at the left end of the connecting plate 69 is removed, and the connecting plate 69 is rotated around the screw 78B toward the electrical box 65 to retract from the front of the nozzle base 22. If this is done, the nozzle base 22 can be taken out without removing the connecting plate 69.

(Explanation of exhaust hood)
Then, as shown in FIGS. 10 and 11, the exhaust hood 20 is fixed to the upper side of the inner casing 26 of the heat exchanger 19, and has a cover-shaped exhaust casing 80 whose front surface opens to cover the left and right sides and the rear portion, and the exhaust casing. A rectifying plate 81 provided inside the 80, a caulking plate 82 fixed to the lower surface of the rectifying plate 81, a reinforcing flange plate 83 caulked and fixed to the lower surface of the exhaust casing 80 together with the middle casing 26, and a rectifying plate 81 and reinforcement. It includes a packing 84 arranged between the flange plate 83 and the flange plate 83.
The exhaust casing 80 is formed by raising a mounting plate 85 for mounting the exhaust stack 9 on the outer periphery of the opening, and becomes higher toward the rear from the opening, and the rear is the highest bulging portion 86. As shown in FIG. 12, the upper flange portion 87 is formed on the left and right and the rear three sides along the outer circumference, and the downward outer folded portion 88 is formed along the entire circumference of the upper flange portion 87. ing. A plurality of caulking pieces 89, 89, ... Are projected downward at predetermined intervals in the outer folded portion 88.

The straightening vane 81 has a rectangular plate shape in a plan view having a width of fitting to the lower surface of the exhaust casing 80, and has a horizontal portion 90 formed on the front side and an inclined portion 91 formed behind the horizontal portion 90 which rises toward the rear. The rear end of the inclined portion 91 is formed in a U-shape folded upward in the bulging portion 86. At the front end of the horizontal portion 90, mounting pieces 92, 92, ... That project downward on the same vertical surface as the mounting plate 85 of the exhaust casing 80 are formed. Raising pieces 93, 93 that abut on the left and right inner surfaces of the exhaust casing 80 are formed at the left and right side edges of the straightening vane 81 and the folded ends of the inclined portion 91, and the rising pieces 93, 93 exhaust the exhaust. It is screwed to the left and right inner surfaces of the casing 80.

Therefore, in the exhaust casing 80, after moving backward along the inclined portion 91 below the straightening vane 81, it wraps upward along the folded end portion of the straightening vane 81 and makes a U-turn forward, and the straightening vane An exhaust passage is formed above the 81 that moves forward to reach the opening.
The caulking plate 82 is a strip plate welded to a concave portion 94 in the left-right direction recessed in the horizontal portion 90 of the straightening vane 81, and the front edge of the caulking plate 82 has an inverted convex front caulking piece 95, 95.・ However, it is formed by cutting it downward at a predetermined interval.

The reinforcing flange plate 83 has a quadrangular outer shape in which the left and right ends and the rear end are formed along the inside of the outer folded portion 88 of the exhaust casing 80, and the front end is formed along the inside of the mounting piece 92 of the straightening vane 81. On the outer periphery of the metal plate, an outer folded portion 88 and an inner folded portion 96 overlapping the inside of the mounting piece 92 are provided around the outer circumference downward. A quadrangular opening 97 into which the upper end of the inner casing 26 fits is formed at the rear side of the reinforcing flange plate 83, and a downward hanging portion 98 is provided around the inner circumference of the opening 97. .. On the front side of the opening 97, a plurality of long left and right through holes 99, 99 through which each front caulking piece 95 of the caulking plate 82 penetrates along the trailing edge are formed. A downward squeezing portion 100 is provided around the inner circumference of each through hole 99.

Similar to the reinforcing flange plate 83, the packing 84 has left and right ends and rear ends formed along the inside of the outer folded portion 88 of the exhaust casing 80, and the front end is located behind the front caulking piece 95 of the caulking plate 82. It has a quadrangular frame-shaped portion 101 that orbits along the outer circumference of the opening 97, and is made of an elastic material. On the front side of the frame-shaped portion 101, at both left and right ends, extending portions 102 are extended until they come into contact with the mounting pieces 92, and are wider than the frame-shaped portion 101. As shown in FIG. 13, the extended portion 102 straddles the upper flange portion 87 of the exhaust casing 80 and the horizontal portion 90 of the straightening vane 81 and comes into contact with each other.

The exhaust hood 20 is screwed by assembling a rectifying plate 81 to which a caulking plate 82 is fixed inside the exhaust casing 80. On the other hand, in the reinforcing flange plate 83, the upper end of the middle casing 26 is fitted into the opening 97, and the lower flange portion 103 (FIG. 11) provided on the upper peripheral edge of the middle casing 26 is attached to the peripheral edge of the opening 97 from above. Lock.
Next, as shown in FIG. 14, the exhaust casing 80 is assembled to the upper surface of the reinforcing flange plate 83 with the packing 84 positioned inside the outer folded portion 88 of the exhaust casing 80 and inside the front crimping piece 95. , The front caulking pieces 95, 95 ... Are penetrated through the through holes 99, 99 ... Then, each crimped piece 89 of the exhaust casing 80 is folded back inward, and as shown in FIG. 11, the lower flange portion 103 on the upper side is crimped and fixed together with the inner folded portion 96 of the reinforcing flange plate 83. On the other hand, if each front caulking piece 95 is folded back and the lower flange portion 103 together with the reinforcing flange plate 83 is caulked and fixed together with the throttle portion 100, the fixing of the exhaust hood 20 is completed. Finally, the exhaust stack 9 may be screwed to the mounting plate 85 of the exhaust casing 80 and the mounting piece 92 of the straightening vane 81.

(Explanation of water heater operation)
In the bath water heater 1 configured as described above, when the hot water tap of the pipe connected to the hot water outlet 11 is opened and water is passed through the appliance, the water from the water inlet 12 passes through the water side component 40. It passes through the water inlet pipe 32 and the heat transfer pipe 27 of the hot water supply side heat exchanger. On the other hand, the controller 66, which detects water flow by the water amount sensor 46 of the water side component 40, ignites the first burner group and rotates the air supply fan 25 to supply combustion air to the first burner group. The combustion exhaust of the first burner group is heat-exchanged with the heat transfer tube 27 by passing through the hot water supply side heat exchanger in the first combustion chamber, hot water of a predetermined temperature is discharged from the hot water outlet pipe 33, and the piping is connected from the hot water outlet 11. It is supplied from the hot water tap via.

On the other hand, when the hot water filling switch provided on the remote controller (not shown) is turned on, the controller 66 ignites the first burner group to discharge hot water of a predetermined temperature from the hot water discharge pipe 33, and the hot water discharge pipe 33 and the outgoing pipe 35 are connected. A control valve (not shown) provided between the drop pipes 38 is opened to supply hot water from the hot water outlet pipe 33 to the bathtub via the drop pipe 38 and the outbound pipe 35. When a predetermined amount of hot water is supplied, the hot water filling is stopped.
When the additional cooking switch of the remote controller is turned on, the controller 66 drives the pump 37 to ignite the second burner group, and the air supply fan 25 is rotated to supply combustion air to the second burner group. The hot water from the bathtub passes through the heat transfer tube 27 of the bath side heat exchanger, and the combustion exhaust of the second burner group passes through the bath side heat exchanger in the second combustion chamber to exchange heat with the heat transfer tube 27. To. Therefore, the hot water in the bathtub is reheated while circulating.

Then, the combustion exhaust that has passed through the heat exchanger 19 enters the exhaust casing 80 through the opening 97 of the reinforcing flange plate 83 of the exhaust hood 20, wraps around from below the rectifying plate 81 to the upper side through the exhaust passage, and is exhausted. It is discharged from the cylinder 9 to the outside of the appliance. At this time, even if the exhaust hood 20 projects forward from the inner casing 26 of the heat exchanger 19, the reinforcing flange plate 83 and the inner casing 26 are brought together by the front caulking piece 95 of the caulking plate 82 immediately in front of the opening 97. Since it is caulked and fixed, the sealing property can be maintained. In particular, since the packing 84 orbits along the opening 97, more reliable sealing is possible.

(Effect of the invention relating to the electrical box)
According to the bath water heater 1 of the above-described embodiment, a projecting portion 70 projecting downward and a retaining pin 71 projecting to the left and right from the projecting portion 70 are provided on the lower surface of the electrical box 65, while being housed in the housing 2. A pedestal 68 having an upper plate portion 72 on which the electrical box 65 in the state is placed is provided, and the upper plate portion 72 of the pedestal 68 is larger than the left and right width of the protruding portion 70 and is larger than the left and right length of the retaining pin 71. A slit 75 having a small width is provided in the front-rear direction, and the protruding portion 70 can enter and exit the lower side of the upper plate portion 72 through the slit 75, and when it enters the lower side of the upper plate portion 72, it is prevented from coming off. By being guided in the front-rear direction by the slit 75 in a state where the pin 71 is prevented from coming off, the electrical box 65 can be taken in and out of the mounting position on the cradle 68. Therefore, the electrical box 65 can be smoothly taken in and out, and can be easily fixed without interfering with other components such as piping. Further, since it is temporarily fixed on the cradle 68 in the housing 2, the fixing work can be easily performed.

In particular, here, the pedestal 68 has a front plate portion 73 and a rear plate portion 74 that support the upper plate portion 72, and is provided upward on the bottom surface of the housing 2, and the front end of the slit 75 is provided in the front plate portion 73. By forming an entrance / exit 76 through which the protrusion 70 including the retaining pin 71 can pass, the protrusion 70 can enter the slit 75 through the entrance / exit 76, so that the upper plate portion 72 can be moved back and forth. It can be supported and made into a compact cradle 68 having a small left-right width. Further, even if the front plate portion 73 is provided, it does not interfere with the entry and exit of the protrusion 70.

Further, a combustion chamber is arranged above the electrical box 65 in the housing 2, and a plurality of pipes are arranged side by side in the front-rear direction between the lower casing 21 of the combustion chamber and the electrical box 65. Since the connecting plate 69 in which the 77 is formed and passes through the gap between the pipes in the pipe space 77 is erected between the nozzle base 22 on the lower casing 21 side and the electrical box 65, the electrical box is installed in the housing 2. The electrical box 65 can be fixed in the housing 2 by using the nozzle base 22 on the lower casing 21 side without providing the fixing portion of the 65.
Further, the fixing piece 79 of the electrical box 65 with the connecting plate 69 is formed so as to project upward from the electrical box 65, and the connecting plate 69 is screwed to the fixing piece 79 at one end and to the nozzle base 22 at the other end. As a result, the upper part of the electrical box 65 can be easily fixed and released. Further, if the screw 78A on the nozzle base 22 side of the connecting plate 69 is removed and the connecting plate 69 is rotated toward the electrical box 65 side around the screw 78B on the fixing piece 79 side, the connecting plate 69 is attached to the electrical box 65. It can be retracted from the piping space 77 as it is. Therefore, the nozzle base 22 can be easily removed.

The shape of the electrical box is not limited to the above-mentioned form, and may be a box body in which six surfaces are completely closed, or conversely, a front view U-shape composed of a top plate, a bottom plate, and a side plate connecting both plates. And so on. As for the protruding portion, the protrusion can be integrally projected on the side surface of the protruding portion as a retaining portion.
The shape of the cradle can also be changed as appropriate, such as extending the side plate portions to the left and right of the upper plate portion and forming the front plate portion with a pair of left and right leg plates. In addition, the structure is such that the front plate portion and the rear plate portion are eliminated and the upper plate portion is supported by the left and right side plate portions of the upper plate portion, and a rising portion that is bent upward from the side edge of the upper plate portion is provided. The front view may be L-shaped, and the rising portion may be fixed to the side plate of the housing to support the upper plate portion.
The position of the fixing piece may be provided on the upper plate instead of the front plate, or may have a forward-facing screw boss shape.

(Effect of the invention relating to water side parts)
According to the bath water heater 1 of the above-described embodiment, the water inlet pipe 32 is connected to the first path portion 42 of the water side component 40 on the upstream side first water pipe 32A and the downstream side connected to the heat exchanger 19. The downstream end of the first water pipe 32A and the upstream end of the second water pipe 32B are separably connected by a first clip member 53A that elastically engages with the second water pipe 32B. The bypass pipe 34 is divided into an upstream first bypass pipe 34A connected to the second path portion 43 of the water side component 40 and a downstream second bypass pipe 34B connected to the hot water discharge pipe 33. The downstream end of the first bypass pipe 34A and the upstream end of the second bypass pipe 34B are separably connected by the second clip member 53B that elastically engages with both of them. By attaching and detaching the two clip members 53A and 53B, the work of assembling and removing the water side component 40 to the housing 2 can be easily performed. Therefore, it leads to improvement of productivity and maintainability. In particular, since the water inlet pipe 32 and the bypass pipe 34 are divided and one of them is integrated with the water side component 40, it is possible to smoothly connect and disconnect the water inlet pipe 32 and the bypass pipe 34, and each pipe can be connected. No needless stress is applied.

In particular, here, the upstream path portion 41 is connected to the water inlet 12 via the joint cylinder 64 connected to the water inlet 12, and the downstream end of the joint cylinder 64 and the upstream route portion 41 are connected to both. Since the third clip member 53C that is elastically engaged is connected so as to be separable, the water side component 40 can be removed more smoothly.
Further, the second water inlet pipe 32B and the second bypass pipe 34B are located in the front and back in the depth direction in the housing 2 and are arranged downward, respectively, and the first path portion 42 and the second path portion of the water side component 40 are provided. Each of the 43 is formed toward the opening 7 side of the housing 2, the second stepping motor 59 of the bypass throttle portion 58 is arranged above the second path portion 43, and the first water pipe 32A is on the opening 7 side. After extending to, it is bent upward and connected to the second water inlet pipe 32B by the first clip member 53A, and the first bypass pipe 34A is bent upward on the opening 7 side of the second stepping motor 59. Since it is connected to the second bypass pipe 34B by the second clip member 53B, the first water pipe 32A and the first bypass pipe 34A are piped on the front side of the second stepping motor 59, respectively, and the second water pipe 32B and the first 2 Connected to the bypass pipe 34B. Therefore, the water-side component 40 can be formed in a space-saving manner, and the water-side component 40 can be easily removed without interfering with other components.

The division position of the water inlet pipe and the bypass pipe is not limited to the above-mentioned form, and may be set further downstream if there is no problem in taking in and out the water side parts, or the division position of the water inlet pipe and the bypass pipe may be set to each other. May be released. The first path portion and the second path portion may be arranged upside down, or may be arranged side by side depending on the space in the housing.
Further, in the above embodiment, the upstream path portion is connected to the water inlet via the joint cylinder, but the upstream route portion may be directly connected to the water inlet by a clip member without the joint cylinder.
Further, the form of the clip member can be changed as appropriate, for example, the folded portion is formed in a curl shape, the wire is bent instead of the strip-shaped plate to form the left and right clamp portions, or the two strip-shaped plates are combined to form the clip member. A structure that can be used is also conceivable.

(Effect of the invention relating to the exhaust hood)
According to the bath water heater 1 of the above-described embodiment, the exhaust hood 20 is arranged on the left and right sides of the middle casing 26 and on the upper side of the rear portion by opening the exhaust hood 20 so as to project forward from the heat exchanger 19 and closing the left and right and rear portions. The exhaust casing 80 is provided with a plurality of caulking pieces 89 for caulking and connecting the lower flange portions 103 to the left and right end edges and the rear end edge, and the left and right sides of the lower surface of the exhaust casing 80. The lower flange portion 103 is fitted with the upper end of the middle casing 26 and the crimp plate 82 which is erected in the direction and is provided with a plurality of front crimp pieces 95 which are erected in the direction and project downward from above the front end of the lower flange portion 103. It has an opening 97 to be locked, and is arranged below the upper flange portion 87 and the caulking plate 82 via a frame-shaped packing 84 that circulates around the opening 97, and penetrates through the front caulking piece 95. The lower flange portion 103 includes a reinforcing flange plate 83 provided with a hole 99, and the left and right end edges and the rear end edge of the lower flange portion 103 are crimped and fixed via the reinforcing flange plate 83 by a caulking piece 89 of the upper flange portion 87. At the same time, the front end edge is caulked and fixed by the front caulking piece 95 penetrating the through hole 99 of the reinforcing flange plate 83. Therefore, even in the exhaust hood 20 projecting to the front side of the heat exchanger 19, the front end edge of the lower flange portion 103 can be satisfactorily caulked and fixed, and the sealing property can be ensured.

In particular, here, the exhaust casing 80 is provided with a straightening vane 81 for forming an exhaust passage in the exhaust hood 20, and the caulking plate 82 is integrally provided on the lower surface of the straightening vane 81. The crimping plate 82 can be assembled at an appropriate position by the straightening vane 81, and the number of parts does not increase. Therefore, manufacturing cost and management cost can be suppressed.
Further, the packing 84 has a frame-shaped portion 101 that overlaps the upper flange portion 87 and the rear end of the caulking plate 82 and circulates around the opening 97, and the upper flange portions are provided on both sides of the front end of the frame-shaped portion 101. Since the extending portions 102 and 102 that overlap the mating portion between the 87 and the straightening vane 81 are projected, the seam between the upper flange portion 87 and the straightening vane 81 can be reliably sealed. Therefore, higher sealing performance can be ensured.

The number and shape of the crimped pieces and the front crimped pieces are not limited to the above-mentioned form, and can be changed as appropriate. The caulking plate may not be provided integrally with the straightening vane, but may be erected on the lower surface of the exhaust casing as a separate member in the left-right direction.
As for the shape of the packing, if further sealing properties are required, the width of the left and right extension parts can be increased, or the entire part except the opening in the frame-shaped part can be covered with packing by connecting the left and right extension parts. Good.

And, in common with each invention, the piping form of the water inlet pipe, the hot water outlet pipe, the bypass pipe and the like is not limited to the above form, and the arrangement of the water side parts and the electrical box is not limited to the above form. Therefore, the water-side component may be further arranged on the right side in the housing, or the electrical box may be arranged along the left side plate.
Further, in the above-described embodiment, the bath water heater capable of filling and reheating the bathtub is described, but each invention can be applied even to a water heater having no bath function.
On the other hand, the inventions relating to the electrical box and the water side component can be applied not only to the sensible heat recovery type water heater but also to the latent heat recovery type water heater. Further, the inventions relating to the exhaust hood and the electrical box can also be applied to a water heater that is not a bypass mixing type.

1 ... Bath water heater, 2 ... Housing, 7 ... Opening, 8 ... Front cover (cover), 11 ... Hot water outlet, 12 ... Water inlet, 13 ... Gas inlet, 14 ... Outlet , 15 ... Return port, 17 ... Inner body, 18 ... Burner unit, 19 ... Heat exchanger, 20 ... Exhaust hood, 21 ... Lower flange, 22 ... Nozzle stand, 26 ... Middle casing ( Casing), 32 ... Water inlet pipe, 32A ... 1st water inlet pipe, 32B ... 2nd water inlet pipe, 33 ... Hot water outlet pipe, 34 ... Bypass pipe, 34A ... 1st bypass pipe, 34B ... 2nd Bypass pipe, 35 ... Outward pipe, 36 ... Return pipe, 40 ... Water side parts, 41 ... Upstream side route part, 42 ... 1st route part, 43 ... 2nd route part, 44 ... Total amount Drawer, 45 ... Downward cylinder, 47 ... Forward cylinder, 48 ... 1st stepping motor, 50,61 ... 1st locking flange, 52,63 ... 2nd locking flange, 53 ... Clip member (53A: 1st clip member, 53B: 2nd clip member, 53C: 3rd clip member), 55 ... Clamp part, 57 ... Locking slit, 58 ... Bypass throttle part, 59 ... 2nd stepping motor (Actor), 64 ... Joint cylinder (joint member), 65 ... Electrical box, 66 ... Controller, 68 ... Cradle, 69 ... Connecting plate, 70 ... Protruding part, 71 ... Retaining pin ( Retaining part), 72 ... Upper plate part, 73 ... Front plate part, 74 ... Rear plate part, 75 ... Slit, 76 ... Doorway, 77 ... Piping space, 79 ... Fixed piece (Fixed part) ), 80 ... Exhaust casing, 81 ... Straightening plate, 82 ... Crimping plate, 83 ... Reinforcing flange plate, 84 ... Packing, 87 ... Upper flange part (second flange part), 89 ... Crimping piece , 95 ... Front caulking piece, 97 ... Opening, 99 ... Through hole, 101 ... Frame-shaped part, 102 ... Extension part, 103 ... Lower flange part (first flange part).

Claims (3)

A housing that has a water inlet and a hot water outlet at the bottom and the front opening is closed by a removable cover.
The heat exchanger housed inside the housing and
A water pipe whose downstream end is connected to the upstream end of the heat exchanger,
A hot water outlet pipe connected between the downstream end of the heat exchanger and the hot water outlet,
A bypass pipe whose downstream end is connected to the hot water discharge pipe and
Includes a water-side component that connects the upstream end of the water inlet pipe to the upstream end of the bypass pipe .
The water side part is connected with the entering-Mizuguchi, an upstream path portion having a total amount throttle portion for adjusting the amount of water sensors and water, is connected to the upstream end of the entering water tubes, passing through the upstream path portion a first path portion of water that can be supplied to the water inlet pipe, which is connected to the upstream end of the bypass pipe includes a bypass throttle portion for adjusting the amount of water to the bypass pipe, the water passing through the upstream path portion a water heater comprising possess a second path portion can be supplied to the bypass pipe,
The water pipe is divided into a first water pipe on the upstream side connected to the first path portion of the water side component and a second water pipe on the downstream side connected to the heat exchanger. The downstream end of the first water pipe and the upstream end of the second water pipe are separably connected by a first clip member that elastically engages with both.
The bypass pipe is divided into a first bypass pipe on the upstream side connected to the second path portion of the water side component and a second bypass pipe on the downstream side connected to the hot water discharge pipe. 1 A water heater characterized in that the downstream end of the bypass pipe and the upstream end of the second bypass pipe are separably connected by a second clip member that elastically engages with both. The upstream path portion is connected to the water inlet via a tubular joint member connected to the water inlet, and the downstream end of the joint member and the upstream path portion are elastic to both. The water heater according to claim 1, wherein the water heater is separably connected by a third clip member engaged with the water heater. The second water inlet pipe and the second bypass pipe are located in the front and rear in the depth direction in the housing and are arranged downward, respectively.
The first path portion and the second path portion of the water side component are each formed toward the opening side of the housing, and the actuator of the bypass throttle portion is arranged on the upper side of the second path portion.
After extending to the opening side, the first water pipe is bent upward and connected to the second water pipe by the first clip member.
The hot water supply according to claim 1 or 2, wherein the first bypass pipe is bent upward on the opening side of the actuator and is connected to the second bypass pipe by the second clip member. vessel.

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