JP2019066111A - Shut-out valve and bath water heater - Google Patents

Abstract

To improve drain performance by preventing residual water in an opening/closing portion.SOLUTION: In a bath water heater, a shut-out valve 45 is provided in a branch path 83 formed between two check valves 44, 44 in a drop-in pipe 41, and it is seated in a valve seat 89 provided in the branch path 83 and operates in a valve closing position for closing the branch path 83 in the case where a water pressure on a water supply circuit side is higher than a water pressure on a bathtub side, and it is separated from the valve seat 89 and operates in a valve opening position for opening the branch path 83 in the case where the water pressure on the water supply circuit side is lower than the water pressure on the bathtub side. On the outside of a seating portion with the valve seat 89, a cutout 96 is formed for preventing hot water from staying between itself and the valve seat 89 in the valve opening position.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an edge cut valve used for a bath water heater capable of supplying hot and cold water from a hot water supply circuit to a bath and a bath water heater provided with the edge cut valve.

In the bath water heater, the water supply pipe and the hot water discharge pipe are connected to the heat exchanger heated by the burner, and the external hot water supply pipe is connected to open the external hot water supply tap and supplied from the water supply pipe via the external water pipe. It is known that a hot water supply circuit for heating the water to be discharged and a bath circuit in which a bath forward pipe connected to an external bath and a bath return pipe are connected to the same or another heat exchanger. ing. Here, a drop-in pipe is connected between the hot water supply circuit and the bath circuit, and the hot water discharged by the hot water supply circuit is dropped and supplied from the pipe to the bath through the bath circuit and can be filled.
In such a bath water heater, as disclosed in Patent Document 1, two check valves for preventing backflow of hot and cold water from the bath side are disposed in series in the drop-in pipe, and reversely. Connect a branch path that opens to the atmosphere between stop valves, and in that branch path, an edge cut valve that includes a partition that receives the pressure on the hot water supply circuit side and a valve element that operates integrally with the partition It is provided. When the water pressure on the hot water supply circuit side is higher than the water pressure on the bathtub side normally, the partition valve receives the water pressure on the hot water supply circuit side to close the valve body and the valve valve operates from the downstream side check valve When the backflow occurs and the water pressure on the bathtub side becomes high, the partition receives the water pressure on the bathtub side to open the valve body, and the hot and cold water flowing back between the check valves is discharged through the branch path. There is.

Unexamined-Japanese-Patent No. 2004-150662

  The valve body of the edge cut valve is provided at the front end of the holding member fixed to the partition wall with a ring-shaped seat portion to be seated on the valve seat of the branch path. It is structured to be separated from the valve seat. However, since the gap (opening degree) between the valve seat and the seat portion at the time of valve opening is small, the backflowing hot water remains in the gap by tension, and the hot water remains without being discharged from the branch path, There was a risk of freezing in winter.

  Then, an object of this invention is to provide the edge-cut valve and bath-water heater which can prevent the residual water in an opening-and-closing part and can improve drainage performance.

In order to achieve the above object, the invention according to claim 1 is characterized in that a hot water supply circuit having a burner and a heat exchanger, and the hot water supply circuit can be connected to an external bath to supply hot water from the hot water supply circuit to the bath And a dropping pipe including two check valves for preventing backflow of hot and cold water from the bathtub side, provided in a branch path formed between the two check valves in the dropping pipe in the bath water heater. If the water pressure on the hot water supply circuit side is higher than the water pressure on the bathtub side, the water pressure on the hot water supply circuit side operates on the valve closing position where the water pressure on the hot water supply circuit side In the case of lower than water pressure, it is an edge cut valve operating in an open valve position which opens the branch path away from the valve seat,
At least one notch is formed on the outside of the seating portion with the valve seat to prevent retention of hot and cold water with the valve seat at the valve opening position.
The invention according to claim 2 is characterized in that, in the configuration according to claim 1, a plurality of notches are provided at equal intervals in the circumferential direction.
In order to achieve the above object, the invention according to claim 3 is characterized in that a hot water supply circuit having a burner and a heat exchanger and a hot water supply circuit are connected to an external bath to supply hot water from the hot water supply circuit to the bath A bath water heater comprising: a drop pipe provided with two check valves for preventing backflow of hot and cold water from the bathtub side;
An edge cut valve according to claim 1 or 2 is provided in a branch path formed between the two check valves in the drop pipe.

According to the inventions of claims 1 and 3, notches are formed outside the seating portion of the edge cut valve with the valve seat to prevent retention of hot and cold water with the valve seat at the valve opening position. Thus, it is possible to improve the drainage performance by preventing the residual water at the opening / closing part by the edge cut valve.
According to the second aspect of the present invention, in addition to the above effects, since a plurality of notches are provided at equal intervals in the circumferential direction, the tension of the hot and cold water at the opening and closing part can be reliably broken, and the drainage performance is further enhanced. Can be expected to improve.

It is a schematic circuit diagram of a bath water heater. It is an external appearance explanatory view of a bath water heater, (A) shows a front, (B) shows a plane, (C) shows a side, respectively. It is a bottom view of a bath water heater. It is a front view of the inside of a case which omitted a front cover. It is the front view of the inside which abbreviate | omitted the housing | casing, the controller, and the wiring connected with this. It is a perspective view from the front of FIG. FIG. 6 is a perspective view from the rear of FIG. 5; It is the AA expanded sectional view of FIG. It is a perspective view of a sheet part and an outside attaching member.

Hereinafter, embodiments of the present invention will be described based on the drawings.
(Schematic configuration of bath water heater)
FIG. 1 is a schematic circuit diagram showing an example of a bath water heater. This bath water heater 1 supplies combustion air to each burner unit 3 and three burner units 3, 3... Provided with a plurality of burners 4, 4. In the upper part in the combustion chamber 2, a hot water supply heat exchanger 6 and a bath heat exchanger 7 through which the combustion exhausts of the burners 4, 4... Pass are juxtaposed. 8 is a spark plug, 9 is a flame rod, and an exhaust hood 10 for exhausting the combustion exhaust gas passing through both heat exchangers 6, 7 is provided at the upper part of the combustion chamber 2. A sheet-like overheat protection device 11 printed with a fuse circuit for detecting leakage of combustion exhaust gas from the chamber 2 is wound.

  A gas pipe 12 to which a gas pipe from the outside is connected is connected to a gas inlet of a device accommodating the combustion chamber 2 and the like, and each burner unit 3 is connected to branch pipes 13, 13 · · · branched from the gas pipe 12 Are connected to each other, and each branch pipe 13 is provided with a gas solenoid valve 14 for opening and closing a gas flow path. In addition, a source gas solenoid valve 15 and a gas proportional valve 16 are provided on the upstream side of the gas pipe 12 before branching.

The hot water supply heat exchanger 6 includes a hot water supply heat transfer pipe 18 penetrating the plurality of fins 17, 17 ··· arranged at a predetermined interval in a serpentine manner, and the inlet of the hot water supply heat transfer pipe 18 is a water inlet of an appliance. The water supply pipe 19 connected to is connected, and the outlet pipe 20 connected to the hot water outlet of the appliance is connected to the outlet of the hot water supply heat transfer pipe 18. A water pipe thermistor 21 for detecting the temperature of the hot water supply heat transfer pipe 18 is provided at a bent portion of the hot water supply heat transfer pipe 18 exposed to the outside of the hot water supply heat exchanger 6. Further, a bypass pipe 22 bypassing the hot water supply heat exchanger 6 is connected between the water supply pipe 19 and the hot water discharge pipe 20, and a connection portion between the water supply pipe 19 and the bypass pipe 22 is driven by a stepping motor. A distribution valve 23 for variably controlling the flow rate of the bypass pipe 22 is provided.
There is.

Further, on the upstream side of the connection portion of the water supply pipe 19 with the bypass pipe 22, a water inlet thermistor 24 for detecting the temperature of the incoming water and a hot water supply sensor 25 for detecting the amount of water flowing through the water supply pipe 19 are provided.
Then, at the outlet of the hot water supply heat exchanger 6 in the hot water discharge pipe 20, a hot water supply heat exchanger thermistor 26 for detecting the outlet temperature is provided, and the hot water discharge temperature is detected downstream of the connection portion with the bypass pipe 22 A hot water discharge hot water thermistor 27 and a water amount control valve 28 which is driven by a stepping motor to variably control the flow rate of the hot water discharge pipe 20 are provided.
Therefore, the hot water supply heat exchanger 6 heated by the burner unit 3 and the hot water supply circuit 19 including the water supply pipe 19 and the hot water discharge pipe 20 connected to the hot water supply heat exchanger 6 and the bypass pipe 22 are formed here.

On the other hand, the bath heat exchanger 7 includes a bath heat transfer pipe 30 penetrating the fins 17 17 in a meandering manner, and the bath adapter 32 of the external bath 31 at the inlet of the bath heat transfer pipe 30 via external piping. The bath return pipe 33 connected is connected to the outlet of the bath heat transfer pipe 30, and the bath return pipe 34 connected to the bath adapter 32 via an external pipe is connected. A pump 35 is provided in the bath return pipe 33, and a bath return thermistor 36 for detecting a bath return temperature is provided on the upstream side thereof, and a hot water in the bath return pipe 33 is provided on the downstream side of the pump 35. A bath water flow switch 37 which is turned ON / OFF by the flow and a water level sensor 38 which detects the water level in the bath 31 by water pressure are provided. Further, a bath-tripping thermistor 34 is provided in the bath-passing pipe 34 for detecting the bath-passing temperature.
Therefore, a bath circuit B including a bath heat exchanger 7 to be heated by the burner unit 3 and a bath return pipe 33 and a bath forward pipe 34 connected between the bath heat exchanger 7 and the bath 31 are provided here. Is formed.
As described above, in the bath water heater 1, the hot water supply heat exchanger 6 and the bath heat exchanger 7 having different paths are provided side by side in one combustion chamber 2 and heated by the common burner units 3, 3. It is a can 2 channel type.

Then, between the hot water supply circuit A and the bath circuit B, a drop pipe 41 is connected between the pump 35 and the bath return thermistor 36 in the bath return pipe 33 on the downstream side of the water quantity control valve 28 in the hot water pipe 20 There is. A bath water amount sensor 42 for detecting the amount of water flowing through the dropping pipe 41 is provided on the upstream side of the dropping pipe 41, and a dropping water solenoid valve 43 for opening and closing the dropping pipe 41 is provided on the downstream side. Furthermore, two check valves 44, 44 are provided on the downstream side of the dropping water solenoid valve 43, respectively, and between the check valves 44, 44, the hot and cold water flowing back from the bath return pipe 33 is A discharge valve 45 is connected. The margin cut valve 45 will be described later.
Reference numeral 50 denotes a controller that receives detection signals from the thermistors, sensors, etc., operates the valves, etc., and performs hot water temperature control, pouring control to the bathtub 31, etc. 51 is a hot water supply remote control, and 52 is a bath remote control.

(Normal operation of bath water heater)
In the bath water heater 1, normal hot water supply is performed as follows.
The hot water supply tap of the external piping connected to the hot water outlet is opened and water flows in the device, and when the water flow is detected by the hot water supply amount sensor 25, the controller 50 rotates the combustion fan 5 for a predetermined time to burn The combustion exhaust stored in the chamber 2 is discharged (prepurge). Thereafter, the source gas solenoid valve 15 of the gas pipe 12 and each gas solenoid valve 14 are opened, the gas proportional valve 16 is opened at a predetermined opening degree, gas is supplied to each burner unit 3, and the igniter is operated. The burner 4, 4,... Is ignited by the spark plug 8.
Thereby, in the hot water supply heat exchanger 6, the water flowing through the hot water supply heat transfer pipe 18 is heat-exchanged with the combustion exhaust of the burner 4, and the heated hot water is discharged from the hot water supply tap through the hot water discharge pipe 20 and the external piping.

The controller 50 monitors the outlet temperature by the hot water supply heat exchanger thermistor 26 of the hot water discharge pipe 20, and drives the stepping motor of the distribution valve 23, and the outlet temperature prevents the generation and overheating of the drain in the hot water supply heat exchanger 6. The flow rate (bypass rate) to the bypass pipe 22 is controlled so as to be maintained within the possible temperature range.
Also, the hot water discharge temperature is monitored by the hot water discharge hot water thermistor 27 and the open / close control of each gas solenoid valve 14 and the opening of the gas proportional valve 16 so that the hot water discharge temperature becomes the set temperature instructed by the hot water supply remote control 51 or the bath remote control 52. The air amount is continuously changed by controlling the rotational speed of the combustion fan 5 while performing the power adjustment.
When the hot water supply plug is closed, the controller 50 that has confirmed the stop of the signal from the hot water supply amount sensor 25 closes the original gas solenoid valve 15 and the gas solenoid valve 14 to extinguish the burner 4 and rotates the combustion fan 5 for a predetermined time (post purge).

On the other hand, when the automatic switch of the hot water supply remote control 51 or the bath remote control 52 is pressed, the controller 50 opens the drop water electromagnetic valve 43 of the drop pipe 41 to cause the hot water supply heat exchanger 6 to flow water to burn the burner 4. Hot water from the hot water discharge pipe 20 is supplied to the bath 31 through the drop-in pipe 41 and the bath return pipe 33. When the water amount detected by the bath water amount sensor 42 provided in the dropping pipe 41 reaches the set water amount, the dropping water solenoid valve 43 is closed to stop the water flow, and the burner 4 is extinguished.
Next, the pump 35 is operated to circulate hot water between the bath heat exchanger 7 and the bath 31. At this time, if the temperature of the hot water circulating is monitored by the bath return thermistor 36 and the bath going thermistor 36 and it is confirmed that the temperature from the set temperature is lowered, the burners 4, 4. Combustion air is supplied by the fan 5. Therefore, when the bath circulating water circulating between the bath heat exchanger 7 and the bath 31 flows through the bath heat transfer pipe 30, it is heat-exchanged with the combustion exhaust of the burner 4 and heated to the set temperature. When the set temperature is reached, the combustion of the burner 4 is stopped and the pump 35 is stopped.

(The appearance of bath water heater)
And FIG. 2 is explanatory drawing which shows the external appearance of the bath water heater 1, (A) is a front, (B) is a plane, (C) is each showing the side. The bath water heater 1 closes a front surface of a vertically elongated box-like case 60 which is opened by a top plate 61 and a bottom plate 62, left and right side plates 63A and 63B, and a back plate 54 to open the front surface. A front cover 65 is provided, and a horizontally long cylindrical exhaust port 66 provided on the front of the exhaust hood 10 is made to project above the front cover 65. Intake ports 67, 67,... Are provided at lower and side portions of the front cover 65.

  Further, FIG. 3 is a bottom view of the bath water heater 1. In the bottom plate 62, a water inlet 68 for connecting the water supply pipe 19 to an external water pipe is provided at the left rear. A hot water outlet 69 is provided for connecting the pipe 20 to an external hot water tap. In addition, a bath return port 70 for connecting the bath return pipe 33 to the bath 31 is provided on the front right side, and a bath port 71 for connecting the bath transfer pipe 34 to the bath 31 is provided on the central rear. It is done. A gas inlet 72 for connecting the gas pipe 12 to an external gas pipe is provided in the central portion, and an inlet 73 for a power supply line is provided in front of it. An overflow port 74 to which a drain pipe 86 of an edge cut valve unit 80 described later is connected is provided slightly forward between the hot water outlet 69 and the inlet port 73.

(Inside the case of a bath water heater)
4 is a front view of the inside of the case 60 with the front cover 65 removed, FIG. 5 is a front view of the inside with the case 60, the controller 50 and the wiring connected thereto omitted, and FIG. FIG. 7 is a perspective view from the rear side.
The combustion chamber 2 is disposed on the upper side in the housing 60, and includes a lower casing 75 accommodating the burner unit 3 and an upper casing 76 accommodating the hot water supply heat exchanger 6 and the bath heat exchanger 7. The exhaust hood 10 is assembled on the upper side of the upper casing 76. The combustion fan 5 is provided on the lower rear side of the combustion chamber 2, and when the housing 60 is opened at the lower portion of the combustion chamber 2, the controller 50 configured to accommodate the electrical component board in a square box in a front view It is installed sideways.
The water supply pipe 19 connected to the water inlet 68 is disposed upward through between the combustion chamber 2 and the side plate 63A on the left side of the housing 60, and the right side from the left side of the upper casing 76. Then, it moves forward between the upper casing 76 and the right side plate 63B, and is connected to the hot water heat transfer pipe 18 of the hot water supply heat exchanger 6 at the lower front of the right side of the upper casing 76.

The hot water supply side heat transfer pipe 18 is disposed on the rear side of the upper casing 76 from the right side front side of the upper casing 76 to which the water supply pipe 19 is connected while passing through the fins 17, 17 in a serpentine manner in the upper casing 76, It moves upward at the rear of the upper casing 76, and is disposed forward while passing through the fins 17, 17 in a meandering manner, and is connected to the outlet pipe 20 at the upper front right side of the upper casing 6 .
The hot water discharge pipe 20 is drawn forward from the upper right side front upper portion of the upper casing 76 to cross the front of the upper casing 76 obliquely downward, and then the combustion chamber 2 in front view of the feed pipe 19. And the left side plate 63A, and is connected to the hot water outlet 69 through the water amount control valve 28 by being bent downward. The bypass pipe 22 is also vertically disposed between the combustion chamber 2 and the side plate 63A.

On the other hand, the bath heat transfer pipe 30 is disposed in the back and forth direction while passing through the fins 17, 17 ··· in a meandering manner between the hot water supply heat transfer pipes 18 disposed above and below. The front end of the bath heat transfer pipe 30 is The left side front side central portion of the casing 76 is connected to the bath return pipe 33, and the rear end is connected to the bath passing pipe 34 at the right side rear side central portion of the upper casing 76.
The bath return pipe 33 is routed to the front of the upper casing 76 and crosses the front of the upper casing 76 diagonally downward behind the tapping pipe 20 and intersects the tapping pipe 20 in front view, and then the right side of the upper casing 76 , And bent downward between the combustion chamber 2 and the right side plate 63B, and is connected to the bath return port 70 via the bath water flow switch 37 and the pump 35.
After coming around from the rear of the upper casing 76 to the left, the bath feed pipe 34 is bent downward so as to be between the combustion chamber 2 and the left side plate 63A in a front view behind the water supply pipe 19 After being bent diagonally to the center side behind the combustion fan 5, it is connected to the bath opening 71.

  As described above, the pipes such as the water supply pipe 19, the hot water discharge pipe 20, the bath return pipe 33, and the bath return pipe 34 are disposed on the side or the rear of the lower casing 75 or the controller 50 in front view Since it is not located, if the front cover 65 is removed, maintenance of the burner unit 3 and the controller 50 etc. in the lower casing 75 can be performed as it is. In particular, in the one-can double-water type combustion chamber 2, the outlet pipe 20 and the bath return pipe 33 are connected to the outlet side from the combustion chamber 2 and the normal connection side to the bottom plate 62 for convenience of drawing in a narrow space. Although the right and left sides are reversed, they are arranged on the upper side of the lower casing 75 so as to cross each other, so the lower space can be secured even if the connection side to the bottom plate 62 is reversed. .

(Edge cut valve unit)
The drop-in pipe 41 is disposed upward from the water amount control valve 28 and is connected to the right bath return pipe 33 via an edge cut valve unit 80 disposed vertically below the combustion chamber 2 and vertically. .
As shown in FIG. 8, the rim cut valve unit 80 has a drop passage 82 in the unit case 81 in communication with the drop tube 41 and is a part thereof in the vertical direction, and in the drop passage 82 Two non-return valves 44, 44 are arranged in series. Further, a branch path 83 is branched backwardly between the check valves 44 and 44 in the drop path 82, and the downstream side of the branch path 83 is provided with a front drainage path 84 and a rear introduction path 85. Are branched. A drainage pipe 86 connected to the overflow port 74 is connected to the drainage path 84, and an introduction pipe 87 connected to the water supply pipe 19 is connected to the introduction path 85.

The cutoff valve 45 is provided on the upstream side of the drainage passage 84 in the branch passage 83. The edge cut valve 45 is integrally provided with the diaphragm 88 on the upstream side (front side in FIG. 8) of the diaphragm 88 and on the upstream side of the drainage passage 84. And a valve body 90 provided with a seat portion 91 capable of being seated on a valve seat 89 provided in the branch path 83. The seat portion 91 is an elastic ring such as an O-ring, and the valve body 90 is fitted on the front surface of the outer holding member 92 and the outer holding member 92 holding the seat portion 91 at the front and the rear end is coupled to the diaphragm 88 And a disk-shaped inner holding member 93 for pressing and fixing the seat portion 91 from the inside.
Among these, as shown in FIG. 9, the outer holding member 92 has a circular shape in a front view, and a ring-shaped concave groove 94 for holding the sheet portion 91 is formed on the front surface and the center of the front surface The projection 95 with which the inner side holding member 93 is fitted is protrudingly provided by this. In addition, rectangular notches 96, 96,... Are formed at equal intervals in the circumferential direction on the outer periphery of the front end, which allow the concave groove 94 to partially communicate with the outside.

In the bath water heater 1 configured as described above, in the edge cut valve unit 80, during normal times, the water pressure on the hot water supply circuit A side added to the introduction path 85 from the introduction pipe 87 is a bath added to the branch path 83 from the dropping path 82 Since it is higher than the water pressure on the 31 side, the partition wall 88 receives the water pressure on the introduction path 85 side to move the valve body 90 forward to seat the seat portion 91 on the valve seat 89 to elastically deform and block the branch path 83 To close the valve.
Then, when the backflow from the check valve 44 on the downstream side occurs and the water pressure applied to the branch path 83 from the dropping path 82 becomes higher than the water pressure on the introduction path 85 side, the partition 88 receives the water pressure on the bath 31 side and the valve 90 Is moved backward to separate the seat portion 91 from the valve seat 89. Therefore, the backflowing hot water flows from the branch passage 83 into the drainage channel 84 and is discharged from the drainage channel 84 through the drainage pipe 86 from the overflow port 74.
When the separation distance (opening degree) between the valve seat 89 and the seat portion 91 is small at this valve opening time, hot water tends to stay between the valve seat 89 and the front end of the seat portion 91 and the outer holding member 92 by tension. However, since the notches 96, 96 ··· are formed on the outer periphery of the front end of the outer holding member 92, the tension is broken and the water does not stay. Therefore, the hot and cold water flowing back to the branch path 83 is reliably discharged to the drainage path 84, and there is no risk of freezing in winter.

(Effect of the invention concerning the cut valve)
As described above, according to the on-off valve 45 and the bath water heater 1 of the above embodiment, the on-seat portion (seat portion 91) of the on-off valve 45 with the valve seat 89 is opened with the valve seat 89 at the valve opening position. By forming the notches 96 for preventing the retention of hot and cold water between the two, it is possible to prevent the residual water at the opening and closing part by the edge cut valve 45 and to improve the drainage performance.
Particularly in this case, since the plurality of notches 96 are provided at equal intervals in the circumferential direction, the tension of the hot and cold water at the opening and closing part can be reliably broken, and further improvement of the drainage performance can be expected.

The number and shape of the notches are not limited to those described above, and may be one or five or more. Further, the shape of the notch may be another shape such as a V shape or a semicircular shape, or may be formed long in the circumferential direction.
Further, the configuration of the edge cut valve itself is not limited to the above embodiment, and the shapes of the outer holding member and the inner holding member can be changed as appropriate, and the half divided into two in the axial direction instead of the outer and inner The valve body may be formed of a member. Furthermore, it is also possible to form a valve body not only with 2 members but with 3 or more members.

On the other hand, in the above embodiment, the one-can two-channel type bath water heater has been described, but the invention according to the cut valve is not limited to one-can two-channel type, and a hot water supply combustion chamber having a hot water supply heat exchanger and a bath It may be a bath water heater formed separately from a bath combustion chamber having a heat exchanger and the bath circuit is formed separately from the hot water supply circuit.
And in the invention which concerns on a margin cut valve, a bath return pipe and a bath passing pipe which connect between a bath heat exchanger and a bathtub are not essential, and a bath hot water supply only comprising a drop-in pipe which connects a hot water discharge pipe of a hot water supply circuit with a bath. Even if it is a container, it is applicable. The bypass pipe is not essential.

(Effect of the invention concerning the intersection of piping)
According to the bath water heater 1 of the above embodiment, the pipes (the hot water discharge pipe 20 and the bath return pipe 33) in which the draw-out side from the combustion chamber 2 and the connection side with the external pipe at the bottom plate 62 are reversed in the left-right direction After being drawn out from 2, the burner unit 3 is accommodated in the combustion chamber 2 by being drawn around to the connection side with the external piping by crossing each other in front of the hot water supply heat exchanger 6 and the bath heat exchanger 7. The piping can be disposed in front of the lower casing 75 or below the combustion chamber 2 so as not to pass through. Therefore, maintenance such as the burner unit 3 and the controller 50 can be performed without getting in the way of the piping, and even if it is a single can and two water channel type, the workability concerning maintenance can be improved.
In particular, here, since the two pipes of which the drawing side from the combustion chamber 2 and the connection side of the external pipe are reversed left and right are the hot water discharge pipe 20 and the bath return pipe 33, the connection side at the bottom plate 62 is left and right The two separate pipes can be disposed in a space-saving manner without being disturbed in the housing 2.

In addition, in the said form, although the hot water discharge pipe is made to cross on the front and a bath return pipe is made to cross behind, it does not interfere even if it crosses back and forth.
Moreover, the piping to cross is not limited to the said form, such as making a water supply pipe and a bath return pipe cross, etc. depending on the withdrawal side from a combustion pipe, not only a hot water discharge pipe and a bath return pipe.
Furthermore, it is possible to cross not only two pipes but also three or more pipes.

  Besides, in the above embodiment, one heat exchanger is used for hot water supply and the other heat exchanger is used for repressing the bath, but the invention relating to the intersection of the pipes is not limited thereto, for example, the other heat exchanger It is applicable even if connected to a floor heater or the like for heating. That is, the application of the one can and two water channels is not limited to the above-described water heater.

  1 · · Bath water heater, 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · combustion fan, 6 · · hot water heat exchanger, 7 · · bath heat exchanger, 12 · · · gas Tube 17 17 fin 18 Hot water supply heat pipe 19 Water supply pipe 20 Hot water discharge pipe 22 Bypass pipe 25 Hot water supply amount sensor 28 Water amount control valve 30 Bath Heat transfer pipe 31, bath 33, bath return pipe 34, bath forward pipe 35, pump 41, drop pipe 44, check valve 45, cut valve 50, 50 Controller · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · overflow port , 75 · · lower casing, 76 · · upper casing, 80 · · cut-off valve unit, 81 · · · Knitted case, 82, drop path, 83, branch path, 84, drainage path, 85, introduction path, 86, drainage pipe, 87, introduction pipe, 88, diaphragm, 89, valve seat, 90 · · · valve body, 91 · · · seat portion 92 · · · outer holding member 93 · · inner holding member 94 · · recessed groove, 96 · · notch.

Claims (3)

A hot water supply circuit having a burner and a heat exchanger, and two reversely connected from the hot water supply circuit to an external bath so that hot water from the hot water supply circuit can be supplied to the bath and preventing backflow of hot water from the bath side A bath water heater including a drop-in pipe provided with a stop valve, provided in a branch path formed between the two check valves in the drop-in pipe, wherein the water pressure on the hot water supply circuit side is the bath When the water pressure is higher than the water pressure on the side, the valve seat is provided on the valve seat provided in the branch path to operate at the valve closing position for closing the branch path, and the water pressure on the hot water supply circuit side is lower than the water pressure on the bathtub side Is an end valve operated at a valve opening position for opening the branch path away from the valve seat,
At least one notch is formed outside the seating portion with the valve seat to prevent retention of hot and cold water between the valve seat and the valve seat.   The edge cut valve according to claim 1, wherein a plurality of the notches are provided at equal intervals in a circumferential direction. A hot water supply circuit having a burner and a heat exchanger, and two reversely connected from the hot water supply circuit to an external bath so that hot water from the hot water supply circuit can be supplied to the bath and preventing backflow of hot water from the bath side It is a bath water heater including a drop-in pipe provided with a stop valve,
The edge cut-off valve according to claim 1 or 2 is provided in a branch path formed between the two check valves in the drop-in pipe.

Images