JP4359342B2 - Water heater and its piping connection system and water supply joint - Google Patents

Description

  The present invention relates to a water heater that heats water to be introduced and supplies hot water to a desired hot water supply destination, a pipe connection system thereof, and a water supply joint.

  FIG. 9 shows a general conventional example of a bath apparatus installed in a bathroom. In this conventional bath apparatus, a bathtub 3 and a balance bath 4 are juxtaposed in a bath installation space 2, and a supply / exhaust cylinder 5 of the balance bath 4 is installed in a wall hole 6 of the bathroom wall 1. However, when the balance bath 4 and the bathtub 3 are juxtaposed in the relatively small bath installation space 2 as described above, the bathtub 3 must be made small in size, so the bath 3 should be bathed in a cramped posture. I had to relax and enjoy the bathing.

  Therefore, when replacing the balance bath 4, the user purchases a water heater with an automatic hot water filling function instead of the balance bath 4 and supplies the water heater 7 until now as shown in FIG. 8. The exhaust pipe 5 is fitted in the wall hole 6 and installed, and the bathtub 3 larger than the balance bath 4 space is installed in the bath installation space 2 to improve the living environment. Yes. In addition, 8 in FIG. 8 shows the mixing faucet attached to the apron of the bathtub 3. FIG.

  FIG. 5 shows a model example of the water heater 7 equipped with an automatic hot water filling function. Since a water heater having such a hot water filling function is well known, its configuration will be briefly described here. The mechanism of the hot water heater 7 is configured in an appliance case 9, and burners 11a and 11b are arranged in a combustion chamber 10, and a combustion fan 13 for supplying and exhausting combustion of the burners 11a and 11b is provided below the burner 11a. Has been placed. The burners 11a and 11b are supplied with fuel gas from the corresponding nozzle headers 12a and 12b, and the gas passages connected to the nozzle headers 12a and 12b are respectively connected upstream by gas solenoid valves 14a and 14b. The gas line 15 is integrated with a proportional valve 16 and an original solenoid valve 17. Reference numeral 27 denotes a spark plug that performs burner ignition, and 28 denotes a frame rod 28 that detects ignition of the burner.

  In the combustion chamber 10, a hot water supply heat exchanger 22 and a bath heat exchanger 39 are arranged above the burners 11 a and 11 b, and a water supply pipe 18 is connected to the water inlet side of the hot water supply heat exchanger 22, and its water supply The pipe 18 is provided with a water amount sensor 19 for detecting a water supply amount (hot water supply amount) and an incoming water temperature sensor 29 for detecting the incoming water temperature to the hot water supply heat exchanger 22. A hot water supply pipe 31 is connected to the outlet side of the hot water supply heat exchanger 22, and the hot water supply pipe 31 is provided with a can body temperature sensor 23 for detecting the temperature of the can body and a hot water supply temperature sensor 24 for detecting the hot water supply temperature. It has been. The hot water supply pipe 31 and the water supply pipe 18 are communicated with each other by a bypass passage 21, and a servo valve 20 that adjusts the mixing ratio of hot water and water is provided at a connection portion between the bypass passage 21 and the water supply pipe 18. Reference numeral 30 denotes a water pipe temperature sensor for detecting the temperature of the water pipe, and 26 denotes a drain plug.

  The bathtub 3 and the bath heat exchanger 39 are communicated with each other through a recirculation circuit 54. This recirculation circulation path 54 is a pipeline that returns from the bathtub 3 to the external return pipe 33, the internal return pipe 34, the pipe 38, the bath heat exchanger 39, the internal forward pipe 40, and the external forward pipe 41 in this order. The internal return pipe 34 is provided with a water flow switch 48 for detecting a water flow, a bath temperature sensor 47 for detecting the temperature of hot water in the bathtub 3, and a circulation pump 35 for circulating the bathtub hot water. The pipe 33 and the external forward pipe 41 are connected and fixed to the bathtub 3 using a circulation fitting 42.

  The hot water supply pipe 31 and the pipe line 38 are communicated with each other by a pouring pipe 32, and the pouring pipe 32 is provided with a vacuum breaker 46, a pouring electromagnetic valve 44, a check valve 43, and a hot water amount sensor 36. The hot water produced by the exchanger 22 is passed through the hot water supply pipe 31, the pouring pipe 32, and the recirculation circuit 54 in this order by water pressure, and dropped into the bathtub 3 to fill the hot water. A hot water servo 25 provided at the connection between the hot water pipe 32 and the hot water pipe 31 adjusts the hot water supply amount (hot water amount), 45 indicates an overpressure relief valve, and 37 indicates the water level in the bathtub 3. The water level sensor which detects is shown.

  The operation of the water heater 7 is controlled by a control device 51, to which a bathroom remote controller 52 installed in the bathroom and a kitchen remote controller 53 installed in the kitchen are connected. These remote controllers designate hot water supply set temperature, pouring set temperature, hot water level, bath temperature, etc., and instruct automatic hot water operation, reheating operation, and the like.

  The water heater 7 performs operations of various functions such as a hot water supply function, a hot water filling function, and a heat retention function. Since the operation of each of these functions is known, the operation of these functions will be briefly described below. The operation of the hot water supply function is to turn on the operation switch (not shown) of the bathroom remote control 52 or the kitchen remote control 53, and in this state, the hot water supply destination of the external hot water supply pipe (not shown in FIG. 5) connected to the hot water supply pipe 31 It starts by opening a hot-water tap (not shown) provided in. When the hot water tap is opened, the control device 51 combusts one or both of the burners 11a and 11b and passes through the hot water supply heat exchanger 22 when the flow rate sensor 19 detects a flow rate that is equal to or higher than the minimum operating flow rate that passes the water supply pipe 18. Water is heated to create hot water, and the hot water is supplied to a hot water supply destination through a hot water supply pipe 31.

  In the operation of the hot water supply function, the control device 51 determines whether the hot water temperature is based on detection information of the incoming water temperature by the incoming water temperature sensor 29, the hot water supply amount by the water amount sensor 19, and the hot water temperature (outlet temperature) by the hot water temperature sensor 24. The amount of gas supplied from the gas line 15 is controlled by the valve opening amount of the proportional valve 16 so that the hot water supply set temperature set by the kitchen remote controller 53 (or the bathroom remote controller 52) is reached. The hot water supply operation is terminated when the hot water tap at the hot water supply destination is closed. That is, when the water amount sensor 19 detects the stop of water flow by closing the hot water tap, the control device 51 shuts off the gas supply to the burners 11a and 11b and stops the combustion of the burners 11a and 11b.

  The operation of the hot water filling function (the operation of automatic hot water filling operation) is started by turning on an automatic switch (not shown) of the bathroom remote controller 52 (or the kitchen remote controller 53) in a state where the operation switch is turned on. . Then, the hot water solenoid valve 44 is opened, and the water passing through the hot water heat exchanger 22 becomes hot water by the combustion heating of the burners 11a and 11b in the same manner as the operation of the hot water function. 32 enters the bathtub 3 through the recirculation circuit 54. The water level of the bathtub 3 is detected by the water level sensor 37, and when the detected water level reaches the set water level of the bathtub set by the bathroom remote controller 52, the hot water solenoid valve 44 is closed, and the hot water filling operation is finished. In this hot water filling operation, the control device 51 controls the hot water temperature of the hot water heat exchanger 22 by the combustion amount (gas supply amount) so that the hot water filling temperature set by the bathroom remote controller 52 is reached.

  In the operation of automatic hot water filling operation by automatic switch-on, the operation of the heat retaining function is performed following the operation of the hot water filling function. The operation of this heat retention function is to activate the circulation pump 35 for a short time at a predetermined time interval, replenish the hot water in the bathtub 3 and circulate it through the circulation path 54, and the hot water temperature in the bathtub 3 (bath Temperature). When the detection temperature of the bath falls outside the allowable range set by the remote controller and falls below the allowable range, the circulation pump 35 is driven to replenish the hot water in the bathtub 3 and circulate through the circulation path 54, thereby burning the burner 11 a. , 11b is heated by the bath heat exchanger 39 to reheat. Then, when the temperature detected by the bath temperature sensor 47 reaches the set temperature of the bath, the circulation pump 35 is stopped and the combustion of the burners 11a and 11b is stopped. As described above, the operation of the heat retaining function (the heat retaining operation) is performed for a predetermined time (for example, 4 hours) after the hot water filling is completed. In the water heater 7 that performs the water retaining function together with the heat retaining function, the water level of the bathtub is monitored by the water level sensor 37, and the hot water solenoid valve 44 is opened when the water level of the bathtub drops beyond the allowable range from the set water level. Then, the insufficient amount of hot water reaching the set water level from the hot water supply heat exchanger 22 side is replenished, and a water retention operation for maintaining the bathtub water level at the set water level is performed.

  Further, turning on a reheating switch (not shown) of the bathroom remote control 52 or the kitchen remote control 53 performs reheating, and turning off the switching operation stops. In the reheating operation, when the reheating switch is turned on, the circulation pump 35 is driven, and the hot water in the bathtub 3 is recirculated through the recirculation circuit 54. When detected, the burners 11a and 11b are driven to burn, and when passing through the bath heat exchanger 39, the circulating hot water is heated to raise the temperature of the hot water in the bathtub. This reheating operation ends when the bath temperature sensor 47 detects the bath temperature, and when the detected temperature reaches the bath set temperature, the combustion of the burners 11a and 11b and the circulation pump 35 are stopped.

  FIG. 7 shows the appearance of the water heater 7. The body portion 56 is inserted into the wall hole 6 of the bathroom wall 1 so that the back wall 55 of the water heater 7 faces the inside of the bathroom and is installed in the wall hole 6. . At this time, the surface of the water heater 7 on which the exhaust port 49 is formed protrudes out of the bathroom, and combustion exhaust gas is discharged from the exhaust port 49 to the outside. The water heater 7 is provided with a water supply joint 57, a hot water joint 58, a gas joint 59, a bath-out joint 60, and a bath return joint 61, which protrude outside the appliance case 9. Inside the appliance case 9, the water supply end of the water supply pipe 18 is connected to one end side of the water supply joint 57, the water supply end of the hot water supply pipe 31 is connected to one end side of the hot water supply joint 58, and one end side of the gas joint 59 is connected. The gas inlet end of the gas pipeline 15 is connected, the outlet end of the internal forward pipe 40 is connected to one end side of the bath return joint 60, and the water inlet end of the internal return pipe 34 is connected to one end side of the bath return joint 61. Is connected.

  3 and 4 show an example of a connection mode between the water heater 7 and an external water pipe and electrical wiring. As shown in these drawings, an external water supply pipe 63 is connected to the other end side of the water supply joint 57 (an end side protruding from the instrument case 9), and the external water supply pipe 63 is connected to a T-shaped water supply branch joint 75. The branch end of the external water supply pipe 63a is connected to the water supply pipe connection portion of the water supply source plug 74, and the branch front end of the external water supply pipe 63b is mixed with the mixing water tap 73. It is connected to the water supply connection port. In the example of FIG. 3, the mixing faucet 73 is installed on the upper surface of the apron 80 of the bathtub 3 on the bathroom wall 1 side so as not to get in the way.

  An external hot water supply pipe 64 is connected to the other end side of the hot water supply joint 58 (the protruding end side from the appliance case 9). The external hot water supply pipe 64 is connected to the external hot water supply pipe 64a and the outside via a T-shaped water supply branch joint 76. The hot water supply pipe 64b is branched, and a branch hot end of the external hot water supply pipe 64a is connected to a hot water tap 72. In addition, an external hot water supply pipe 64c is connected to a branching tip of the external hot water supply pipe 64b via a joint 78, and a hot water supply / water supply end of the external hot water supply pipe 64c is connected to a hot water supply pipe connection port of the mixing faucet 73.

  Further, an external gas pipe 65 is connected to the other end side of the gas joint 59 (a protruding end side from the instrument case 9), and a gas introduction end of the external gas pipe 65 is connected to a gas plug 77. Further, the external forward pipe 41 is connected to the other end side (the protruding end side from the instrument case 9) of the bath return joint 60, and the other end side (the protruding end side from the instrument case 9) of the bath return joint 61 is connected. An external return pipe 33 is connected.

  In addition, the remote control line 66 connected to the control device 51 inside the instrument case 9, the power cable 67, and the electrical wiring material of the remote control line 68 are led out through the electrical wiring port 62. Is connected to the bathroom remote control 52, and the remote control line 68 is connected to the kitchen remote control 53. And the plug of the power cable 67 provided with the earth leakage breaker 69 is inserted into the outlet of the outlet 71 and the ground wire 70 is connected to the ground terminal 79 of the outlet 71, so that the hot water heater 7 ( Power is supplied to the control device 51).

  FIG. 6 shows a configuration of a conventional water supply joint 57. As shown in the figure, the water supply joint 57 is formed by forming a joint water supply path (cylinder hole) 85 inside a joint body 81 having a cylindrical shape, and one end side of the water supply joint 57 uses a connection portion 82. It is connected to the water supply pipe 18 inside the case 9. A flange 83 is formed on the outer periphery of the joint body 81, and the joint body 81 is screwed and fixed to the instrument case 9 through a screw insertion hole (not shown) provided in the flange 83. A step portion 86 is provided in a lower portion of the joint water supply channel 85, and a filter 87 is attached using the step portion 86. A screw portion 84 is formed on the other end side of the joint body 81, and the external water supply pipe 63 is screwed and fastened using the screw portion 84.

  In the water heater pipe connection system shown in FIGS. 3 and 4, water from a water source such as tap water is supplied from the water supply main plug 74 to the water supply pipe 18 in the water heater 7 through the external water supply pipe 63 a and the external water supply pipe 63. Is supplied. A part of the water supply is supplied to the mixing faucet 73 via the external water supply pipe 63b. The hot water produced by the hot water heater 7 (hot water heat exchanger 22) is fed from the hot water pipe 31 in the appliance case 9 to the external hot water pipe 64 connected to the hot water joint 58, and some of the hot water is external hot water. Hot water is used through the pipe 64a to the hot water tap 72. A part of the hot water is led to the mixing tap 73 through the external hot water supply pipes 64b and 64c. In the mixing faucet 73, as shown in FIG. 3, hot water mixed with the hot water supplied from the external hot water supply pipe 64c and the water supplied from the external water supply pipe 63b is produced. Is dropped into the bathtub 3 from the currant 88 or led to the shower 90 through the hose 89 and used as hot water for the shower.

  With the long-term use of the water heater 7, there is a problem that dust or the like adheres to the filter 87 in the water supply joint 57 and clogging (clogging of the filter) progresses, so that hot water does not come out or dust is mixed in the hot water. appear. In order to eliminate the problems associated with such filter clogging, it is necessary to periodically clean the filter 87. However, since the water heater 7 is disposed in the wall hole 6 of the bathroom wall 1 in which the supply / exhaust cylinder 5 of the balance bath 4 is inserted and disposed, as shown in FIG. 3 and FIG. When the bathtub 3 having a size expanded by the installation space of the pot 4 is installed in the bath installation space 2, the back wall 55 side of the water heater 7 to which the water supply joint 57 is attached is covered with the bathtub 3. Therefore, unless the bathtub 3 is moved and retracted, the work of removing the filter 87 from the water supply joint 57 cannot be performed, and when the filter 87 is washed, the bathtub 3 must be moved each time. It was forced.

  The present invention has been made to solve the above-mentioned problems, and its purpose is large and difficult in that the bathtub must be moved each time when the filter mounted in the water supply joint of the water heater is cleaned. It is an object of the present invention to provide a water heater, its piping connection system, and a water supply joint that can be easily cleaned without removing the filter from the water supply joint.

In order to achieve the above object, the present invention is a means for solving the problems with the following configuration. That is, the water heater of the present invention includes a means for heating the water of the feed water inside the instrument case, and a tool for guiding the water of the feed water to the heating means in the water heater that supplies the hot water produced by the heating means to the outside. The water supply pipe in the case is configured to be connected to an external water supply pipe via a water supply joint at a terminal portion thereof, and the water supply joint has an internal joint water supply path through which the water is supplied. One end of the water supply channel is an external pipe connection that connects to an external water supply pipe, and the other end of the joint water supply channel is a device-side connection that connects to an in-appliance water supply pipe. A water supply branch portion having a branch water passage branched from the joint water supply passage is formed between the pipe connection portion and the appliance side connection portion, and an external pipe is connected to the branch end of the water supply branch portion. Shita A pipe connection portion is formed, and the joint water supply passage is located at a position upstream of the branch portion of the branch water passage between the branch portion of the branch water passage and the end portion on the external pipe connection portion side. The filter is configured to be installed in such a manner as to block the entire cross section of the joint water supply channel .

In addition, the pipe connection system of the water heater of the present invention includes means for heating the water of the water supply inside the appliance case , and an external water pipe is connected to the water heater that supplies the hot water produced by the heating means to the outside. In the water heater pipe connection system, the water heater is “the water supply pipe in the appliance case for guiding the water to be supplied to the heating means is connected to an external water supply pipe via a water supply joint at a terminal portion thereof. The water supply joint has an internal joint water supply passage through which the water supply water flows, and one end side of the joint water supply passage forms an external pipe connection portion connected to an external water supply pipe, and the joint water supply passage The other end side of the water supply pipe is connected to an appliance water supply pipe, and a branch water channel branched from the joint water supply channel is formed between the external pipe connection portion of the water supply joint and the appliance side connection portion. Yes A water supply branching portion is formed, and a pipe connection portion for connecting to an external pipe is formed on the water channel end side of the water supply branching portion, and the branch waterway branch is formed in the joint waterway A filter is mounted at a position upstream of the branch portion of the branch water channel between the outer pipe and the end of the external pipe connection portion side, and the external pipe connection of the water supply joint of the water heater The water supply front end side of the external water supply pipe is connected to the section, the water supply source end side of the external water supply pipe is detachably connected to the water supply pipe connection part of the water supply main plug, and the water channel at the branch destination of the water supply branch part of the water supply joint The end side is connected to the water supply source end side of the external water pipe for mixing faucet, and the front end side of the water faucet water pipe is detachably connected to the water pipe connecting portion of the water faucet. The water supply pipe for stoppers is a flexible pipe that can be expanded and contracted freely. The connecting portion on the tip side of the water supply pipe for the mixed water faucet has a common connection structure that can be selectively connected to the water supply pipe connection portion of the mixed water faucet and the water supply pipe connection portion of the water supply main plug. It is a means to solve the problem with the structure.

Furthermore, the water supply joint of the present invention is a water supply joint provided in the water heater of the present invention, and the water supply joint has an internal joint water supply path through which the water is supplied. One end side is formed as an external pipe connection portion connected to an external water supply pipe, the other end side of the joint water supply path is formed as an appliance side connection portion connected to an in-appliance water supply pipe, and the external pipe connection portion of the water supply joint A water supply branch portion having a branch water passage branched from the joint water supply passage is formed between the water supply branch portion and the appliance side connection portion, and a branch destination water passage end side of the water supply branch portion is connected to an external pipe. are pipe connecting portion forming, said joint water supply channel the said position on the upstream side of the branch portion of the branch water passage between the branch portion and the outer pipe connecting portion side of the end portion of the branch water passage All sections of joint water supply channel Forms have a structure where the mounting portion of the filter for attaching the filter is formed with means for solving the problems in a manner to close.

  In the present invention, an external water supply pipe is connected to the external pipe connection part on one end side of the joint water supply path of the water supply joint, and an in-appliance water supply pipe is connected to the instrument side connection part on the other end side of the joint water supply path, Further, an external pipe is connected to the pipe connection part on the side of the water channel at the branch destination of the water supply branch part of the water supply joint, and further, a branch part of the branch water channel is connected to the joint water supply path. The filter is mounted at a position upstream of the branch portion of the branch water channel between the end portion on the side of the external pipe connection portion.

  Therefore, when using a normal water heater, the water supplied from the external water supply pipe is supplied from the water inlet end of the joint water supply path of the water supply joint to the water supply pipe inside the water heater through the joint water supply path. As hot water is produced, a part of the water supplied through the joint water supply channel is led to an external pipe through the branch water channel. When a foreign substance such as dust adheres to the filter in the water supply joint and cleans it with long-term use of the water heater, connect the water supply inlet (connection on the water supply end) of the external water supply pipe to the water supply plug, etc. Remove water from the water supply source and connect the outlet of the external pipe connected to the branch end of the water supply branch to the water supply source such as the water supply plug, so that the water in the water supply source can be supplied from the external pipe to the water supply joint. It enters the joint water supply passage through the branch water passage, and enters the external water supply pipe through the filter from the joint water supply passage in the reverse direction of the flow of the water supply when using a normal water heater, and the water supply of the external water supply pipe Drained from the inlet (backwater outlet) to the outside.

  Therefore, since the water supply water flows in the direction opposite to the flow direction during normal use, foreign matter such as dust adhering to the filter is easily removed from the filter and drained, and the filter Cleaning by back flow is performed effectively.

  Thus, in the present invention, without removing the filter from the water supply joint, the connection to the water supply source side is connected from the external water supply pipe to the external pipe (external pipe connected to the water channel end side of the branch destination of the water supply branch portion). By simply changing the connection to the tube, the filter can be easily cleaned. Therefore, as shown in FIG. 3 and FIG. 8, it is necessary to move the bathtub 3 when cleaning the filter even when the surface of the water heater 7 exposed in the bathroom is covered with the bathtub 3. In addition, connection change (connection switching) from the external water supply pipe to the external pipe (external pipe connected to the end of the water supply branch) Can be performed on the side of the water supply source where the work is easy to perform, so the connection switching work of the pipe line can be performed very easily.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a water supply joint 57 according to an embodiment of the present invention used in a water heater. The feature of the configuration of the embodiment of the water heater according to the present invention is that the water supply joint 57 of the water heater 7 shown in FIG. 7 is improved to the one shown in FIG. 1, and other configurations are as follows. It is the same as the water heater shown in FIG. 7, and a duplicate description of the components common to the water heater 7 shown in FIG. 7 is omitted.

  The water supply joint 57 of this embodiment is formed by forming a joint water supply path 85 inside a joint body 81 having a cylindrical shape, like the conventional water supply joint 57 shown in FIG. A threaded portion 84 as an external pipe connecting portion is formed on one end side of the joint, and a connecting portion 82 as an instrument side connecting portion is formed on the other end side of the joint water supply channel 85. A stepped portion 86 is formed on the lower side (incoming water side) of the joint water supply channel 85, and a filter 87 is attached using the stepped portion 86. A flange 83 is formed on the outer periphery of the joint body 81 (in the drawing, the outer periphery on the upper side of the joint body 81), and a screw is inserted into a screw insertion hole (not shown) formed in the flange 83. Thus, the water supply joint 57 (joint body 81) is configured to be screwed to the appliance case 9 of the water heater 7.

  The first characteristic point of the water supply joint 57 of this embodiment is that a water supply branch portion 93 is formed between the end portion on the connection portion 82 side and the end portion on the screw portion 84 side of the water supply joint 57. It is. The water supply branch portion 93 has a cylindrical shape protruding in the lateral direction from the joint body 81, and the branch water channel 94 inside the water supply branch portion 93 formed by the cylindrical hole is a water channel structure branched from the joint water supply channel 85. It is made. A threaded portion 95 is formed as a conduit connecting portion for connecting to an external pipe on the end of the water supply branch portion 93 that is a branch destination.

  The second characteristic point of the water supply joint 57 of the present embodiment is that the mounting portion (step portion 86) of the filter 87 attached to the joint water supply passage 85 is the branch portion of the water supply branch portion 93 and the screw portion 84 (external piping connection). Portion), that is, a position that is upstream of the flow of the feed water from the branch part of the branch water channel 94 (branch part of the branch water channel 94) (joint water supply from the branch part of the branch water channel 94) A filter mounting portion (stepped portion 86 in the example in the figure) is formed on the side of the water supply end of the water supply path 85. A filter 87 is attached to the step portion 86 of the filter attachment portion. The water supply joint 57 is connected to the connecting portion 82 side of the water supply end of the water supply pipe 18 (see FIG. 5) inside the water heater 7.

  FIG. 2 shows the configuration of an embodiment of a pipe connection system for a water heater according to the present invention. In this embodiment of the pipe connection system, the difference from the pipe connection system shown in FIG. 4 is that the connection part on the water supply source end side of the external water supply pipe 63 is detachably connected to the water supply pipe connection part of the water supply source plug 74. The water supply tip side connection portion of the external water supply pipe 63 is connected to the screw portion 84 (external pipe connection portion) of the water supply joint 57 (the water supply branch joint 75 of FIG. 4 is unnecessary); A connecting portion on the water supply end side of the water supply pipe 91 for the mixed water tap, which is an external pipe, is connected to a threaded portion (pipeline connecting portion) 95 on the water channel end side of the water supply branch portion 93 of the water supply joint 57, and the mixed water tap The connecting portion on the distal end side of the water supply pipe 91 is detachably connected to the water supply pipe connecting portion of the mixing faucet 73, and the mixing water faucet water supply pipe 91 can be freely expanded and contracted, for example, in a bellows shape. Composed of flexible tube In addition, the connecting portion of the mixing faucet water supply pipe 91 to the water supply pipe connecting portion of the mixing faucet 73 is the same as the connecting portion to the water supply main tap 74, The connecting portion on the distal end side is configured to be selectively connectable to both the water supply pipe connecting portion of the mixing faucet 73 and the water supply pipe connecting portion of the water supply main plug 74. The rest of the configuration is the same as the configuration of the system shown in FIG. 4, and a duplicate description of the configuration that is common to the system of FIG. 4 is omitted.

  In FIG. 2, when using the normal hot water supply of the water heater 7, for example, by opening the hot water tap 72 or the mixed water tap 73, water is supplied from the water supply source side of the water supply source plug 74 through the external water supply pipe 63 to the water supply joint 57. The joint water supply path 85 is entered from the water inlet end side (formation side end portion of the screw portion 84). The incoming water passes through the filter 87 and is introduced into the water supply pipe 18 in the water heater 7 from the end on the connection portion 82 side, and hot water is produced by the combustion of the burners 11a and 11b in the hot water supply heat exchanger 22 (FIG. 5). The hot water is introduced from the hot water supply pipe 31 in the water heater 7 through the hot water supply joint 58 to the external hot water supply pipes 64 and 64a when the hot water supply pipe 72 is opened, and the hot water is discharged from the hot water supply pipe 72. On the other hand, when the mixing faucet 73 is opened, hot water is supplied to the mixing faucet 73 through the external hot water supply pipes 64, 64b, 64c. In the mixing faucet 73, the hot water and the water supplied from the mixing faucet water supply pipe 91 are mixed to produce hot water of a predetermined temperature, and the hot water of the mixture is discharged from the mixing faucet 73, as shown in FIG. Hot water is used in the currant 88 and the shower 90 shown.

  When cleaning the filter 87 in the water supply joint 57, the front end side of the water supply pipe 91 for the mixed water faucet is removed from the water faucet 73, and the water supply source end side of the external water supply pipe 63 connected to the water supply water supply plug 74. Is disconnected and removed, and instead, the front end side connection portion of the water supply pipe 91 for the mixed water faucet is connected to the water supply pipe connection portion of the water supply main plug 74. In this state, water is supplied to the mixed tap water supply pipe 91 from the water supply source plug 74 side. Then, the feed water enters the branch water channel 94 of the water supply joint 57 from the mixed water faucet water supply pipe 91, further passes through the joint water supply path 85, passes through the filter 87, and is discharged to the outside through the external water supply pipe 63. The

  The flow of water through the joint water supply path 85 at the time of washing is a reverse flow opposite to the direction of the flow of water when the normal water heater 7 is used. For this reason, foreign matters such as dust adhering to the filter 87 are easily separated and discharged to the outside from the external water supply pipe 63 along the reverse flow, thereby achieving cleaning of the filter 87 (back flow cleaning). After the cleaning of the filter 87 is completed, the front end side of the water supply pipe 91 for the mixed water faucet is removed from the water supply main plug 74 and is replaced with the water supply pipe connection part of the mixed water faucet 73, and the water supply source end side of the external water supply pipe 63 is supplied with water. By connecting to the main plug 74, it returns to the piping state in the normal use state, and the hot water heater 7 becomes usable.

  In the present embodiment, when cleaning (cleaning) the filter 87 in the water supply joint 57, it is not necessary to remove the filter 87 from the water supply joint 57. Therefore, as shown in FIGS. Even if 3 is arranged so as to cover the water heater 7, the operation of retreating the bathtub 3 is not necessary. Further, since the filter 87 can be cleaned only by changing the connection between the distal end side of the water faucet water supply pipe 91 and the water supply source end side of the external water supply pipe 63, the cleaning operation is very difficult. It becomes easy. In addition, since the mixing faucet water supply pipe 91 is formed of a flexible pipe that can be expanded and contracted and bent, even if the mixing faucet 73 and the water supply main tap 74 are separated, the mixing faucet water supply pipe 91 is provided. It is easy to selectively connect the connecting portion on the front end side to the mixing faucet 73 and the water supply main tap 74.

  Further, in the system of FIG. 2 of the present embodiment example, the water supply branch joint 75 used in the system of FIG. 4 is omitted. Therefore, the external water supply pipe 63 and the external water supply by using the water supply branch joint 75 are omitted. Connection points with the pipe 63a can be reduced, and the piping work can be simplified correspondingly, and the construction time can be shortened.

  Further, in the present embodiment, the hot water introduced into the shower 90 (see FIG. 3) is produced by the mixing faucet 73, and the hot water and water guided to the mixing faucet 73 are provided inside the water supply joint 57. Therefore, the filter 87 in the water supply joint 57 is also used as a filter for the shower 90. Therefore, since it is possible to omit attaching the filter to the shower 90 itself, the apparatus configuration of the shower 90 can be simplified, reduced in size, reduced in weight, and reduced in cost.

  Note that the present invention is not limited to the above-described exemplary embodiments, and various embodiments can be adopted. For example, in the above embodiment, the configuration of the internal mechanism of the water heater 7 has been described with the model example shown in FIG. 5, but the mechanism of the water heater includes a water supply pipe inside the water heater and an external water supply pipe. As long as it is connected using the water supply joint of this invention, what kind of structure may be sufficient, what uses petroleum other than gas as fuel, and the electric heater type hot water heater which does not use fuel may be sufficient.

  Moreover, although the said embodiment demonstrated as an object the example which installs a water heater in the wall hole 6 in which the supply / exhaust pipe | tube 5 of the balance bath 4 was inserted and installed, the installation place of a water heater is not limited to this. . In particular, when a water heater is installed in a place where it is difficult to remove the water supply joint, the filter can be cleaned without removing the water supply joint, which is effective.

  Further, in the above embodiment, as shown in FIG. 1, the branch water channel 94 (water supply branch portion 93) of the water supply joint 57 is orthogonal to the joint water channel 85, but the joint water channel 85 and the branch water channel The intersection angle with 94 may be an angle other than 90 degrees.

  Further, in the above embodiment, the water faucet 91 for mixing faucets is constituted by a flexible pipe, but other pipes (external hot water pipes 64, 64a, 64b, 64c, external water pipe 63, external return pipe 33, external pipe) The tube 41 and the like may also be constituted by a flexible tube as necessary.

  Furthermore, in the above embodiment, the external pipe connected to the threaded portion 95 of the water supply joint 57 is the water supply pipe 91 for the mixed water faucet connected to the mixed water faucet 73. It may be a tube connected to

  Further, in the above embodiment, as shown in FIG. 3, the mixing faucet 73 is installed on the apron 80 of the bathtub 3, and the mixing faucet is directly connected to the water supply pipe connection portion of the mixing faucet 73. Although the connection part of the front end side of the water supply pipe 91 is connected, as shown in FIG. 3, when the mixing faucet 73 is installed at a part of the apron 80 along the bathroom wall 1, Reaching below the apron 80, the leading end of the mixing faucet water supply pipe 91 must be connected to the water supply pipe connecting portion of the mixing faucet 73, and the gap between the bathroom wall 1 and the bathtub 3 is narrow. In some cases, the connection work becomes difficult. When such a situation arises, as shown by an imaginary line in FIG. 2, a relay connection portion 96 may be provided on the side surface of the bathtub 3 that is easy to work, or in a place such as the bathroom wall 1.

  In this case, a pipe line (relay pipe) is connected in advance between the outlet end of the water path of the relay connection part 96 and the water supply pipe connection part of the mixing faucet 73. By doing so, the connecting portion on the distal end side of the mixing faucet water supply pipe 91 has only to be connected to the connecting portion at the inlet end of the water channel of the relay connecting portion 96 at a position where the work is easy to perform. The connection of the distal end side of 91 and the operation of releasing the connection are facilitated, and accordingly, the cleaning operation of the filter 87 in the water supply joint 57 can be easily performed.

It is a figure which shows the structure of the water supply joint which concerns on this invention, (a) is a front view of a water supply joint, (b) is AA sectional drawing of (a). It is a figure which shows the piping connection of the piping system of the water heater based on this invention. It is a reference perspective view of a piping system of a water heater related to the present invention. It is a piping connection reference diagram of the piping system of the water heater related to the present invention. It is a figure which shows the general model example of a water heater in the piping connection state with the bathtub 3. FIG. It is composition explanatory drawing of the conventional water supply joint. It is external appearance explanatory drawing of a water heater. It is explanatory drawing of the state which removed the balance bath and installed the large bathtub 3 in the bath installation space 2 by the installation space of this balance bath. It is explanatory drawing of the bath apparatus using the general balance bath pot 4 which juxtaposed the balance bath pot 4 and the bathtub 3 in the bath installation space 2. FIG.

Explanation of symbols

3 Bathtub 6 Wall Hole 7 Water Heater 57 Water Supply Joint 63 External Water Supply Pipe 64, 64a, 64c External Water Supply Pipe 73 Mixed Water Tap 74 Water Supply Main Tap 85 Joint Water Supply Channel 87 Filter 91 Water Supply Pipe for Mixing Tap 93 Supply Water Branch 94 Branch Water Channel

Claims (3)

In the water heater for supplying hot water produced by the heating means to the outside, the water supply pipe in the equipment case for guiding the water to be supplied to the heating means is provided at its terminal portion. The water supply joint has an internal joint water supply passage through which the water supply water passes, and one end side of the joint water supply passage is an external water supply pipe. And the other end side of the joint water supply path is formed with an instrument side connection part connected to the in-appliance water supply pipe, and the external pipe connection part and the instrument side connection part of the water supply joint A water supply branch portion having a branch water passage branched from the joint water supply passage is formed between, and a pipe connection portion for connecting to an external pipe is formed on the water channel end side of the water supply branch portion. Have been The entire cross-section of the branch water passage filter the joint water supply passage on the upstream side of a position of the branch portion between the branch portion of the branch water passage in the joint water supply channel and the external pipe connecting portion side of the end portion A water heater, which is mounted in a closing manner . In the pipe connection system of a water heater , comprising a means for heating the water of the water supply inside the appliance case, and connecting an external water supply pipe to a water heater for supplying hot water produced by the heating means to the outside, the water heater "The water supply pipe in the appliance case that guides the water to be supplied to the heating means is connected to an external water supply pipe through a water supply joint at the end thereof, and the water supply joint allows the water to pass through the water supply joint. An internal joint water supply channel for water supply, one end side of the joint water supply channel forming an external pipe connection part connected to an external water supply pipe, and the other end side of the joint water supply line connected to an internal water supply pipe A water supply branch portion having a branch water passage branched from the joint water supply passage is formed between the external pipe connection portion and the appliance side connection portion of the water supply joint. A pipe connection part for connecting to an external pipe is formed on the water channel end side of the tip, and the joint water supply channel is provided between the branch part of the branch water channel and the end part on the external pipe connection part side. The filter is mounted at a position upstream of the branch portion of the branch water channel ' ', and the water supply leading end side of the external water supply pipe is connected to the external pipe connection portion of the water supply joint of the water heater, The water supply source end side of the external water supply pipe is detachably connected to the water supply pipe connection part of the water supply source plug, and the water supply pipe end part of the water supply joint of the water supply joint is connected to the water supply end part of the water supply joint. The water supply source end side is connected, and the front end side of the mixed water tap water pipe is detachably connected to the water supply pipe connection part of the mixed water faucet, and the water supply pipe for the mixed water faucet is flexible and can be expanded and contracted freely. Consists of pipes, connection on the tip side of the water supply pipe for mixed faucet The water heater pipe connection system, characterized in that a selectively common connection configuration which is connectable to a water supply pipe connection portion of the water supply main valve and the water supply pipe connection part of the mixing faucet. The water supply joint equipped in the water heater according to claim 1, wherein the water supply joint has an internal joint water supply path through which water is supplied, and one end side of the joint water supply path is connected to an external water supply pipe. The other end side of the joint water supply passage is formed with an appliance side connection portion connected to the in-appliance water supply pipe, and between the external pipe connection portion and the appliance side connection portion of the water supply joint. A water supply branch portion having a branch water passage branched from the joint water supply passage is formed, and a pipe connection portion for connecting to an external pipe is formed on the water channel end side of the water supply branch portion. In addition, the joint water supply channel covers the entire cross section of the joint water supply channel at a position upstream of the branch part of the branch water channel between the branch part of the branch water channel and the end on the external pipe connection part side. off to mount the filter in a manner Water joint water heater, wherein a mounting portion of the filter is formed.

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