Water heater

Abstract

To provide a technique regarding a water heater which facilitates an operator mounting a wiring introducing member on a bottom surface part of the water heater, and in which work for introducing wiring via the wiring introducing member is easy to perform.SOLUTION: A water heater includes: a hot water supply circuit 2; and a housing 100 which has a housing body 102 and a front side cover 101 for opening / closing the housing body 102 from the front side. A guide member 80 is fixed in a constitution of being inserted from the outside of the housing 100 into a hole part 112 of a bottom surface part 110 of the housing body 102. In the guide member 80, a lead-out port 82B is provided for leading out a wiring part L from the inside of an insertion passage 82 further on the front side than the hole part 112. In the inside of the insertion passage 82, an insertion space 83 continues which allows the wiring part L to pass through from an introducing port 82A provided further on the lower position than a bottom surface part 110 to the lead-out port 82B. In the insertion passage 82, an upper side inner wall part 84 is provided further on the upper position than the bottom surface part 110. The upper side inner wall part 84 has a constitution of covering the insertion space 83 from above, and continuing to further front side than the hole part 112.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a water heater.

Background Art

[0002] Patent Document 1 discloses an example of an attachment structure for attaching a terminal inside a water heater. The water heater of Patent Document 1 includes a bottom plate provided with an opening and a connection unit attached to the bottom plate. The connection unit has an opening / closing member attached to the bottom plate so as to open and close the opening, and a terminal block assembled to the opening / closing member. Then, the connection unit switches between a first posture in which the main body portion closes the opening and the elastic deformation portion is caught by the acting portion, and a second posture in which the main body portion opens the opening and the catching of the elastic deformation portion by the acting portion is released. And, in the second posture, the terminal block is in an exposed state exposed below the bottom plate, and in the first posture, the terminal block is configured to be in a non-exposed state where it is not in the exposed state. The water heater of Patent Document 1 has such a configuration that it is possible to open and close the opening of the bottom plate, and the operation of switching the terminal block to the exposed state can be easily performed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, if the configuration of Patent Document 1 is made essential or used frequently, there is a problem that the size or complexity of the device process is likely to increase. On the other hand, other than the configuration of Patent Document 1, for example, a pipe for communicating the space inside and outside the housing is provided on the bottom surface portion of the housing, and wiring introduced through this pipe is fixed to a predetermined position inside the housing by a screw or the like. However, in a structure in which such a pipe is attached from the inside of the housing, it is difficult for an operator to attach the pipe to the bottom surface portion of the housing, and there is a problem that it is difficult to guide the wiring introduced into the housing to an appropriate position (a position fixed by a screw or the like).

[0005] One of the objects of the present disclosure is to provide a technology related to a water heater that enables an operator to easily attach a member for introducing wiring to the bottom surface portion of the water heater and also easily perform an operation of introducing the wiring through the member for introducing wiring.

Means for Solving the Problems

[0006] A water heater according to one aspect of the present disclosure is a water heating circuit that burns gas to perform a water heating operation, a housing main body with an open front end side, and a front cover that opens and closes the housing main body from the front side, and a housing that houses the water heating circuit, a wiring portion attached so as to straddle the inside and outside of the housing main body, a guide member fixed to the housing main body and having an insertion passage through which the wiring portion is inserted, and is provided with a through hole is provided in the bottom surface portion of the housing main body, the guide member is fixed in a configuration inserted through the hole from the outside of the housing, a lead-out port for leading out the wiring portion from the inside of the insertion passage is provided in the guide member on the front side of the hole portion, inside the insertion passage, an insertion space for passing the wiring portion from an inlet provided at a position lower than the bottom surface portion to the lead-out port continues, the insertion passage is provided with an upper inner wall portion at a position higher than the bottom surface portion, The upper inner wall portion covers the insertion space from above and continues in front of the hole portion.

Advantages of the Invention

[0007] When the technology according to the present disclosure is adopted, it is easy for an operator to easily attach a member for introducing wiring to the bottom surface portion of the water heater, and it is also easy to perform the operation of introducing wiring through the member for introducing wiring.

Brief Description of the Drawings

[0008]

Figure 1

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Figure 18

Mode for Carrying Out the Invention

[0009] Each of the following [1] to [7] is an example of a water heater included in the present disclosure.

[0010] 〔1〕 A hot water supply circuit that burns gas to perform a hot water supply operation, A housing body with an open front end, and a front cover that opens and closes the housing body from the front side, and a housing that houses the hot water supply circuit, A wiring portion attached so as to straddle the inside and outside of the housing body, A guide member fixed to the housing body, having an insertion passage through which the wiring portion is inserted, Comprising, A through-hole is provided in the bottom surface portion of the housing body, The guide member is fixed in a configuration inserted through the hole from the outside of the housing, A lead-out port for leading out the wiring portion from the inside of the insertion passage is provided on the front side of the hole portion in the guide member, Inside the insertion passage, an insertion space through which the wiring portion passes from an inlet provided at a position lower than the bottom surface portion to the lead-out port continues, The insertion passage has an upper inner wall portion provided at a position higher than the bottom surface portion, The upper inner wall portion covers the insertion space from above and continues in front of the hole portion. Water heater.

[0011] The water heater according to [1] above can achieve a configuration in which a guiding member is attached to the bottom surface portion of the housing from the outside. Further, in this water heater, the insertion passage provided in the guiding member has an insertion space continuing from the inlet provided below the bottom surface portion to the outlet provided in front of the hole portion. Therefore, the operator can insert the wiring portion from the outside below the housing into the housing and guide it to the front of the hole portion by performing an operation of inserting the wiring portion from the inlet. Also, an upper inner wall portion is provided at a position above the bottom surface portion of the housing in the guiding member so as to cover the insertion space from above, and the upper inner wall portion continues in front of the hole portion. Therefore, when the operator inserts the wiring portion from the inlet, this wiring portion is likely to move forward without moving upward after reaching the upper inner wall portion and is likely to be guided to the outlet.

[0012] (2) The inner wall surface of the upper inner wall portion is inclined so as to be in a front position as it goes upward. The water heater according to (1).

[0013] In the water heater according to [2] above, since the inner wall surface of the upper inner wall portion is inclined so as to be in a front position as it goes upward, when the operator inserts the wiring portion from the inlet, this wiring portion is guided by the inner wall surface (inclined surface) of the upper inner wall portion after reaching the upper inner wall portion and is likely to move forward, and is more likely to be guided to the outlet.

[0014] (3) The front cover has a main body portion having an opening and being detachable from the housing main body, and a closing portion attached so as to close the opening of the main body portion. The opening is provided at a position near the lower end portion of the main body portion. In a state where the closing portion is removed from the main body portion, an external space in front of the front cover and an internal space in the housing main body communicate with each other through the opening. The guiding member is attached at a position near the front end of the bottom surface portion on the rear side of the opening. The water heater according to any one of [1] or [2].

[0015] In the front cover that constitutes the front part of the housing of the water heater of [3] above, an opening is provided at a position near the lower end of the main body part of the front cover, and the guide member is configured to be attached at a position near the front end of the bottom surface part on the rear side of the opening. Due to such a configuration, when the closing part is removed and the external space on the front side of the front cover and the internal space inside the housing body communicate with each other through the opening, it is easy for the operator to access the guide member through the opening. In particular, since the guide member has a lead-out port on the front side of the hole part, the wiring part guided to the front side from the hole part is likely to be located near the opening, and it is easy for the operator to perform work on the wiring part.

[0016] A fixing member is fixed to the bottom surface part. An attachment part for attaching the wiring part is provided in the fixing member at a position in front of the hole part. The attachment part is arranged such that the attachment surface for attaching the screw member faces the front side and the upper side. The wiring part is attached to the attachment part by the screw member while the wiring part is in contact with the attachment surface. The water heater according to [3].

[0017] In the water heater of [4] above, since the attachment part is arranged in front of the hole part and the attachment surface faces the front side and the upper side, the operator can more easily perform the work of attaching the screw member to the attachment surface for fixing the wiring part.

[0018] The size of the outer shape of the projection figure obtained by projecting the upper part of the guide member above the hole part onto the virtual plane is larger than the size of the outer shape of the projection figure obtained by projecting the inner peripheral surface of the hole part onto the virtual plane that is perpendicular to the vertical direction. The water heater according to any one of [1] to [4].

[0019] The water heater described in [5] can relatively enlarge the "portion located above the hole portion" mainly on the upper inner wall portion, so that the portion for guiding the wiring portion becomes larger, and the workability can be further improved.

[0020] 〔6〕 The guide member has an opposing portion facing the peripheral edge portion of the hole portion on the lower surface of the bottom surface portion, and a pair of side wall portions extending upward from the opposing portion. The upper inner wall portion is connected to the upper end portion side of each of the pair of side wall portions. Each of the side wall portions has an upper extending portion extending upward, and a front extending portion extending forward by bending from the upper end side of the upper extending portion. A concave portion is formed by the front edge portion of the upper extending portion and the lower edge portion of the front extending portion continuing from the front edge portion. The water heater according to any one of [1] to [5].

[0021] The water heater described in [6] above can configure the pair of side wall portions to be thinner due to the presence of the concave portion, and it is easy to reduce the size of the hole portion.

[0022] 〔7〕 The guide member has an opposing portion facing the peripheral edge portion of the hole portion on the lower surface of the bottom surface portion, and a pair of side wall portions extending upward from the opposing portion. The upper inner wall portion is connected to the upper end portion side of each of the pair of side wall portions. In at least any one of the pair of side wall portions and the opposing portion, a notch portion into which the front edge portion of the hole portion fits is provided. A fixed portion fixed by a connecting member is provided at a first portion on the rear side of the hole portion in the opposing portion with respect to a second portion on the rear side of the hole portion in the bottom surface portion. The water heater according to any one of [1] to [6].

[0023] The water heater described in [7] above can simply and stably fix the guide member to the bottom surface portion by the front fitting structure by the notch portion and the rear fixing structure by the connecting member.

[0024] <First Embodiment> The following description relates to the water heater 1 according to the first embodiment. The water heater 1 corresponds to an example of a water heater.

[0025] 1. Overall Configuration of the Water Heater 1 FIG. 1 is a schematic circuit diagram of the water heater 1. The water heater 1 mainly includes a hot water supply circuit 2, a heating circuit 3, a bath circuit 4, etc., and is a device capable of performing hot water supply operations, automatic water filling operations, post - heating operations, heating operations, etc.

[0026] The water heater 1 has a housing (not shown), and in this housing, a container 1A configured as a metal casing is provided. Inside this container 1A, a first combustion system unit 5 and a second combustion system unit 6 are configured. The container 1A is configured as, for example, a metal can body or a metal box body, and is configured to accommodate a hot water supply burner 8A (first burner), a heating burner 33A (second burner), a hot water supply side heat exchanger 7 (first heat exchanger), a heating side heat exchanger 32 (second heat exchanger), etc. described later. The first combustion system unit 5 is a combustion system that performs gas combustion and water heating when the hot water supply circuit 2 performs a hot water supply operation. The second combustion system unit 6 is a combustion system that performs gas combustion and water heating during heating operations or post - heating operations.

[0027] The hot water supply circuit 2 is a circuit that performs a hot water supply operation by burning gas. Specifically, it is a circuit that heats water supplied from outside the water heater 1 by the hot water supply side heat exchanger 7 and supplies hot water. The hot water supply circuit 2 includes the first combustion system unit 5, and specifically includes a plurality of hot water supply burners 8A and a hot water supply side heat exchanger 7. The first combustion system unit 5 is provided with a hot water supply combustion chamber 5A, and a hot water supply side burner unit 8 and a hot water supply side heat exchanger 7 are provided in the hot water supply combustion chamber 5A.

[0028] The hot water supply side burner unit 8 includes burner blocks 9A, 9B, and 9C, and each of the burner blocks 9A, 9B, and 9C includes a plurality of hot water supply burners 8A. Each of the plurality of hot water supply burners 8A corresponds to an example of a first burner and is configured as a gas burner that burns gas. In the hot water supply combustion chamber 5A, the entire area where the hot water supply burners 8A (first burners) are arranged is divided into a plurality of burner blocks 9A, 9B, and 9C.

[0029] The hot water supply side heat exchanger 7 corresponds to an example of a first heat exchanger and is a heat exchanger heated by the exhaust gas generated by the hot water supply burner 8A (first burner). The hot water supply side heat exchanger 7 includes a hot water supply side first heat exchanger 7A and a hot water supply side second heat exchanger 7B. In the first combustion system section 5, the hot water supply side first heat exchanger 7A is provided above the plurality of hot water supply burners 8A, and the hot water supply side second heat exchanger 7B is provided above the hot water supply side first heat exchanger 7A. A pipeline 7C is connected between the downstream end of the hot water supply side second heat exchanger 7B and the upstream end of the hot water supply side first heat exchanger 7A, and the hot water flowing through the hot water supply side second heat exchanger 7B flows through the pipeline 7C to the hot water supply side first heat exchanger 7A. The hot water supply side heat exchanger 7 heats the water passing through its interior by the exhaust gas (combustion exhaust gas) generated by burning gas with the plurality of hot water supply burners 8A. The hot water supply side first heat exchanger 7A recovers sensible heat from the combustion exhaust gas discharged from the hot water supply side burner unit 8, and the hot water supply side second heat exchanger 7B recovers latent heat from the combustion exhaust gas discharged from the hot water supply side burner unit 8.

[0030] The hot water supply circuit 2 further includes a water supply pipe 11, a control valve 13A, a water volume sensor 14, a hot water outlet pipe 10, a bypass pipe 12, a control valve 13B, a thermistor 15A (hot water supply inner cylinder thermistor), a thermistor 15B (hot water supply outlet thermistor), and the like. A water supply pipe 11 is connected to the inlet of the hot water supply side heat exchanger 7. The water supply pipe 11 is connected to an external pipe, and is configured as a pipe that introduces tap water from, for example, a water supply and flows this tap water toward the upstream end (inlet) of the hot water supply side heat exchanger 7. The water volume sensor 14 is a sensor that detects the flow rate of water flowing through the water supply pipe 11. The control valve 13A is a valve for controlling the flow rate of water flowing through the water supply pipe 11, and is a valve that changes the opening degree of the water supply pipe 11 in response to control from the outside (specifically, control by the control device 70). A hot water outlet pipe 10 is connected to the downstream end (outlet) of the hot water supply side heat exchanger 7. The hot water outlet pipe 10 is a pipe through which the hot water heated by the hot water supply side heat exchanger 7 flows. The hot water outlet pipe 10 forms a path for discharging the hot water heated by the hot water supply side heat exchanger 7 outside the appliance.

[0031] A bypass pipe 12 is connected between the water supply pipe 11 and the hot water outlet pipe 10 so as to bypass the hot water supply side heat exchanger 7. A control valve 13B (bypass control valve) is provided in the bypass pipe 12. The control valve 13B is a valve for controlling the flow rate of water flowing through the bypass pipe 12, and is specifically configured as a valve that changes the opening degree of the bypass pipe 12 in response to control from the outside (specifically, control by the control device 70).

[0032] A thermistor 15A is provided on the upstream side of the connection portion of the bypass pipe 12 in the hot water outlet pipe 10. The thermistor 15A detects the temperature of the hot water discharged from the hot water supply side heat exchanger 7, and specifically detects the hot water temperature near the outlet of the first heat exchanger 7A on the hot water supply side. A thermistor 15B is provided on the downstream side of the connection portion of the bypass pipe 12 in the hot water outlet pipe 10. The thermistor 15B detects the hot water temperature after mixing of the water from the bypass pipe 12, and specifically detects the temperature of the hot water supplied on the downstream side of the confluence point of the bypass pipe 12 in the hot water outlet pipe 10. The temperatures of the hot water detected by these thermistors 15A and 15B are input to the control device 70 described later.

[0033] The hot water supply circuit 2 further includes a gas pipe 16, a main gas solenoid valve 17, a gas proportional valve 18, and a switching valve 19. The gas pipe 16 is a pipe through which gas supplied from outside the hot water supply and heating apparatus 1 via a gas inlet passes, and forms a path for supplying gas to the hot water supply burner 8A. The main gas solenoid valve 17 is provided on the upstream side of the gas pipe 16, and the gas proportional valve 18 is provided on the downstream side of the main gas solenoid valve 17. In the gas pipe 16, the downstream side of the gas proportional valve 18 (hot water supply gas proportional valve) branches, and branch pipes 16A to each of the burner blocks 9A, 9B, 9C and branch pipes 16B to each of the burner blocks 34A, 34B are provided. Each branch pipe 16A is provided with a switching valve 19 configured as a solenoid valve. The switching valve 19 (hot water supply switching solenoid valve) switches the branch pipe 16A between an open state (supply possible state) and a closed state (shut-off state), and the supply and shut-off of fuel gas to each of the burner blocks 9A, 9B, 9C are individually switched by each switching valve 19. By switching the switching valve 19, the combustion range of the hot water supply side burner unit 8 is switched, and each combustion range is associated as a stage number.

[0034] The hot water supply circuit 2 further includes a fan 20. The fan 20 is provided below the hot water supply combustion chamber 5A. By the operation of the fan 20, combustion air is supplied to each hot water supply burner 8A and the heating burner 33A, and combustion exhaust gas discharged from the hot water supply side burner unit 8 and the heating side burner unit 33 is discharged from the exhaust port. The hot water supply circuit 2 is also provided with an igniter for ignition, an ignition electrode, a hot water supply flame rod, and the like.

[0035] The bath circuit 4 includes a bath circulation path 63 and a bath heat exchanger 50. The bath circulation path 63 forms a flow path configured to circulate hot water derived from an external bathtub 52 and introduce it into the bathtub 52. The bath heat exchanger 50 is configured as a liquid-liquid heat exchanger that performs heat exchange between a heat medium flowing through the bath heating pipe 51 and hot water flowing through the bath circulation path 63.

[0036] The bathtub heat exchanger 50 is provided with a pipe 50A that forms part of the bathtub circulation path 63, and is configured such that the bathtub heating pipe 51 is disposed within the pipe 50A. The bathtub circulation path 63 is configured to include the pipe 50A, the bathtub supply pipe 53, and the bathtub return pipe 54. When the bathtub circulation pump 55 operates, the bathtub circulation path 63 functions as a flow path for drawing out hot water from the bathtub 52 provided outside the hot water supply and heating device 1, and also functions as a flow path for circulating the drawn-out hot water and introducing it into the bathtub 52. The bathtub return pipe 54 is provided with a bathtub circulation pump 55 for flowing the hot water within the bathtub return pipe 54 in a predetermined direction, and a water flow switch 57 for detecting that hot water having a predetermined flow rate or more is flowing through the bathtub return pipe 54. The bathtub return pipe 54 is provided between the bathtub 52 outside the appliance and the pipe 50A, and forms a flow path for flowing hot water from the bathtub 52 to the pipe 50A when the bathtub circulation pump 55 operates. The bathtub supply pipe 53 is provided between the pipe 50A and the bathtub 52, and forms a flow path for flowing hot water from the pipe 50A to the bathtub 52 when the bathtub circulation pump 55 operates. A bathtub supply thermistor 64 for detecting the temperature of the hot water flowing out from the bathtub heat exchanger 50 to the bathtub 52 is provided in the bathtub supply pipe 53. A bathtub return thermistor 65 for detecting the temperature of the hot water flowing into the bathtub return pipe 54 from the bathtub 52 is provided in the bathtub return pipe 54.

[0037] A drop pipe 59 is connected to the bathtub return pipe 54 in a configuration branched from the hot water discharge pipe 10. The drop pipe 59 communicates with the bathtub return pipe 54. The drop pipe 59 is provided with a hot water supply solenoid valve 60, a drop water volume sensor 61, a plurality of check valves 62, and the like. When the hot water supply solenoid valve 60 provided in the drop pipe 59 is opened during the operation of the hot water supply circuit 2, the hot water heated by the hot water supply circuit 2 is supplied to the bathtub 52 through the drop pipe 59.

[0038] The heating circuit 3 is a circuit that can heat a heat medium by the heating-side heat exchanger 32 and supply the heat medium to the heating terminal through the heat medium circulation path 48. In the present embodiment, the heat medium is hot water. The heating circuit 3 includes a second combustion system unit 6 and a heat medium circulation path 48. The second combustion system unit 6 is provided with a heating combustion chamber 6A, and a heating-side burner unit 33 and a heating-side heat exchanger 32 are provided within the heating combustion chamber 6A.

[0039] The heating-side burner unit 33 includes burner blocks 34A and 34B, and each of the burner blocks 34A and 34B includes a plurality of heating burners 33A. Each of the plurality of heating burners 33A corresponds to an example of a second burner and is configured as a gas burner that burns gas. The entire area where the heating burners 33A (second burners) are arranged in the heating combustion chamber 6A is divided into a plurality of burner blocks 34A and 34B.

[0040] The heating-side heat exchanger 32 corresponds to an example of a second heat exchanger and is a heat exchanger heated by the exhaust gas generated by the heating burner 33A (second burner). Specifically, it is a device that acts to heat the heat medium passing through its interior by the combustion exhaust gas of the heating burner 33A. The heating-side heat exchanger 32 includes a heating-side first heat exchanger 32A and a heating-side second heat exchanger 32B. In the second combustion system part 6, the heating-side first heat exchanger 32A is provided above the plurality of heating burners 33A, and the heating-side second heat exchanger 32B is provided above the heating-side first heat exchanger 32A. The heating-side heat exchanger 32 heats the heat medium passing through its interior by the exhaust gas (combustion exhaust gas) generated by burning gas with the plurality of heating burners 33A. The heating-side first heat exchanger 32A recovers sensible heat from the combustion exhaust gas discharged from the heating-side burner unit 33, and the heating-side second heat exchanger 32B recovers latent heat from the combustion exhaust gas discharged from the heating-side burner unit 33.

[0041] The heat medium circulation path 48 is a path for circulating the heat medium so as to pass through the heating-side heat exchanger 32, and forms a flow path for the heat medium. The heat medium circulation path 48 includes a heating high-temperature forward pipe 38A, a heating low-temperature forward pipe 38B, and a heating return pipe 38C. When the heating terminal 39A is connected as shown in FIG. 1, the heat medium circulation path 48 is configured such that the heat medium circulates through the heating high-temperature forward pipe 38A, the heating terminal 39A, and the heating return pipe 38C. When the heating terminal 39Z is connected as shown in FIG. 1, the heat medium circulation path 48 is configured such that the heat medium circulates through the heating low-temperature forward pipe 38B, the heating terminal 39Z, and the heating return pipe 38C.

[0042] The heating circuit 3 further includes an expansion tank 36, a heating circulation pump 37, a heating high-temperature thermistor 40, and a heating low-temperature thermistor 41. A heating high-temperature forward pipe 38A is connected to the outlet of the heating-side heat exchanger 32 (specifically, the outlet of the first heating-side heat exchanger 32A). The heating high-temperature forward pipe 38A is a pipe that allows the heat medium to flow from the heating-side heat exchanger 32 toward the heating terminal 39A. The heating high-temperature forward pipe 38A is configured to communicate with the heating terminal 39A and is connected so as to allow the heat medium to flow through the heating terminal 39A.

[0043] A heating return pipe 38C is connected to the inlet of the heating-side heat exchanger 32 (specifically, the inlet of the second heating-side heat exchanger 32B). The heating return pipe 38C is a pipe that allows the heat medium flowing out from the heating terminal 39A, the heating terminal 39Z, etc. to flow toward the heating-side heat exchanger 32. The heating return pipe 38C is configured to communicate with the heating terminal 39A and the heating terminal 39Z and is connected so as to introduce the heat medium from the heating terminal 39A and the heating terminal 39Z.

[0044] Intermediate pipes 38D and 38E are provided between the outlet of the second heating-side heat exchanger 32B and the inlet of the first heating-side heat exchanger 32A, and the expansion tank 36 and the heating circulation pump 37 are provided in the path of the intermediate pipes 38D and 38E. The intermediate pipe 38D is provided between the outlet of the second heating-side heat exchanger 32B and the expansion tank 36, and the intermediate pipe 38E is provided between the expansion tank 36 and the inlet of the first heating-side heat exchanger 32A. A heating circulation pump 37 is provided in the middle of the intermediate pipe 38E.

[0045] The low-temperature heating pipe 38B for return flow branches from a position downstream of the heating circulation pump 37 in the intermediate pipe 38E, and a plurality of internal branch paths 38F are provided in a configuration branched from the low-temperature heating pipe 38B for return flow. A thermostatic valve 39G is provided in each internal branch path 38F as a valve for opening and closing each branch path 39F. In the example of FIG. 1, one internal branch path 38F communicates with the heating terminal 39Z, and is connected so as to supply a heat medium from this internal branch path 38F to the heating terminal 39Z. The downstream side of the heating terminal 39Z communicates with the heating return pipe 38C on the downstream side of the heating terminal 39A. The heating terminal 39A is, for example, a high-temperature heating terminal such as a heating blower that blows warm air into a bathroom or a dressing room. The heating terminal 39Z is, for example, a low-temperature heating terminal such as floor heating in a dressing room.

[0046] The high-temperature heating thermostat 40 is provided in the high-temperature heating pipe 38A on the outlet side of the heating-side heat exchanger 32, and detects the temperature of the heat medium flowing out from the heating-side heat exchanger 32 (specifically, the heat medium flowing out from the first heating-side heat exchanger 32A). The temperature detected by the high-temperature heating thermostat 40 corresponds to the temperature of the heat medium flowing into the heating terminal 39A during the circulation of the heat medium passing through the heating terminal 39A. The low-temperature heating thermostat 41 is provided in the expansion tank 36. The temperature detected by the low-temperature heating thermostat 41 corresponds to the temperature of the heat medium flowing into the heating terminal 39Z during the circulation of the heat medium passing through the heating terminal 39Z.

[0047] The heating circuit 3 includes a plurality of branch pipes 16B and a plurality of heating switching solenoid valves 44. As described above, the branch pipe 16B is provided in a configuration branched from the gas pipe 16 to the heating circuit 3 side. Each heating switching solenoid valve 44 is provided in each branch pipe 16B. The heating switching solenoid valve 44 is configured to switch the branch pipe 16B in which it is provided between an open state (supply possible state) and a closed state (blocked state). The supply and cutoff of the fuel gas to each of the burner blocks 34A and 34B are individually switched by each heating switching solenoid valve 44. By switching the heating switching solenoid valve 44, the combustion range of the heating-side burner unit 33 is switched, and each combustion range is associated as a stage number. Note that the heating circuit 3 is also provided with an ignition electrode, a heating frame rod, and the like.

[0048] In the example of FIG. 1, the heating terminal 39A is configured as a high-temperature heating terminal, and hot water is supplied to the heating terminal 39A by the operation of the built-in thermostatic valve. The heating terminal 39Z is configured as a low-temperature heating terminal, and hot water is supplied to the heating terminal 39Z by the operation of the thermostatic valve in the appliance. In the heating circuit 3, the hot water heated by the heating-side heat exchanger 32 circulates through the heat medium circulation path 48 due to the operation of the heating circulation pump 37. Specifically, in the heating circuit 3, when the heating circulation pump 37 operates, the hot water flowing through the heating return pipe 38C is heated by the combustion exhaust gas discharged from the heating-side burner unit 33 in the heating-side second heat exchanger 32B and the heating-side first heat exchanger 32A, and when the hot water heated by the heating-side heat exchanger 32 is in a state where it can be supplied to the heating terminal 39A (when the built-in thermostatic valve of the heating terminal 39A is in the open state), it circulates through the heating high-temperature forward pipe 38A, the heating terminal 39A, and the heating return pipe 38C, and when it is in a state where it can be supplied to the heating terminal 39Z (when the built-in thermostatic valve in the corresponding appliance is in the open state), it circulates through the heating low-temperature forward pipe 38B, the heating terminal 39Z, and the heating return pipe 38C.

[0049] As shown in FIG. 1, the bath heating pipe 51 is provided in a configuration branched from the heating high-temperature forward pipe 38A. The bath heating pipe 51 branches from a position downstream of the heating-side heat exchanger 32 in the heat medium circulation path 48 (specifically, downstream of the heating-side first heat exchanger 32A) and forms a flow path for guiding the heat medium flowing through the heat medium circulation path 48 to the bath heat exchanger 50 side. The bath heating pipe 51 is connected between the heating high-temperature forward pipe 38A and the heating return pipe 38C so as to communicate with each other.

[0050] The control valve 58 is a valve provided upstream of the bath heat exchanger 50 in the bath heating pipe 51. The control valve 58 is configured to open and close the bath heating pipe 51, and is configured to switch between a closed state that blocks the water flow passing through itself in the bath heating pipe 51 and an open state that allows the water flow passing through itself in the bath heating pipe 51. The control valve 58 has a switch. This switch is configured as a limit switch, and enters a first state in which a predetermined first signal (for example, an on signal) is output when the control valve 58 reaches the fully open state where it is most open, and enters a second state in which a second signal (for example, an off signal) different from the first signal is output when the control valve 58 reaches the fully closed state where it is blocked.

[0051] The hot water supply and heating machine 1 further includes a control device 70, a hot water supply remote controller 71, a bath remote controller 72, and a room temperature thermistor (not shown). The control device 70 is an electronic control device including an information processing device such as a CPU, a memory such as a semiconductor memory device, an interface circuit, etc., and functions as a controller that performs various controls. Various programs, data tables, set values, etc. are stored in the memory. The control device 70 is configured to be able to acquire signals from various sensors and switches (thermistors, water volume sensors, switches, etc.), and controls the hot water supply circuit 2, the heating circuit 3, the bath circuit 4, etc. The room temperature thermistor is provided, for example, in the changing room as a means for detecting the temperature in the changing room.

[0052] 2. Basic operation of the hot water supply and heating machine 1 (Normal hot water supply operation) For example, when the operations of the heating circuit 3 and the bath circuit 4 are stopped, if a hot water faucet provided outside the apparatus to communicate with the hot water supply pipe 10 is opened and water is passed into the appliance, and when the water volume sensor 14 outputs a signal indicating the passage of water, the control device 70 rotates the fan 20 for a predetermined time to discharge the combustion exhaust gas stored in the hot water supply combustion chamber 5A (purging). Thereafter, the control device 70 opens the main gas solenoid valve 17 and each switching valve 19 of the gas pipe 16, opens the gas proportional valve 18 at a predetermined opening degree, controls to supply gas to each hot water burner 8A, and operates the igniter to ignite the hot water burner 8A. When gas is burned by the hot water burner 8A by such control, the water passing through the hot water supply side heat exchanger 7 is heated by the combustion exhaust gas generated by the combustion and flows to the hot water supply pipe 10, and a hot water supply operation is performed so that the heated hot water is discharged from the above hot water faucet.

[0053] During the above hot water supply operation, the control device 70 monitors the hot water supply temperature detected by the thermistor 15B provided in the hot water supply pipe 10, and performs opening / closing control of the switching valve 19 and adjustment of the opening degree of the gas proportional valve 18 so that the hot water supply temperature becomes the set temperature indicated by the hot water supply remote controller 71 or the bath remote controller 72, and continuously changes the air volume by controlling the rotation speed of the fan 20. When the above hot water faucet is closed during the above hot water supply operation and the signal output by the water volume sensor 14 becomes a signal indicating a water passage stop state, and when the operations of the heating circuit 3 and the bath circuit 4 are stopped, the control device 70 closes the main gas solenoid valve 17 and the switching valve 19 to extinguish the hot water burner 8A, and rotates the fan 20 for a predetermined time to perform post-purging.

[0054] (Automatic hot water filling operation) The control device 70 can perform control to automatically fill the bathtub 52 with hot water. For example, when the hot water filling switch provided on the hot water supply remote control 71 or the bathtub remote control 72 is pressed, the control device 70 sets the hot water outlet temperature to the hot water filling temperature set by the hot water supply remote control 71 or the bathtub remote control 72 as the target temperature (e.g., 40 °C) and starts hot water filling. Specifically, the control device 70 opens the hot water supply solenoid valve 60 of the drop pipe 59 to put the hot water supply circuit 2 into a water flow state, and burns the hot water supply burner 8A so that the heated hot water flows into the hot water outlet pipe 10. The hot water flowing through the hot water outlet pipe 10 in this way is supplied to the bathtub 52 through the drop pipe 59 and the bathtub return pipe 54.

[0055] After the control device 70 starts supplying hot water to the bathtub 52 in this way, it monitors whether the water volume detected by the drop water volume sensor 61 provided in the drop pipe 59 (total water volume since the start of automatic hot water filling) has reached the set water volume. When it is confirmed that the water volume has reached, the control device closes the hot water supply solenoid valve 60 to stop the water flow, extinguishes the hot water supply burner 8A, and ends the hot water filling. After that, the control device 70 operates the bathtub circulation pump 55 to circulate the hot water in the bathtub 52 in the bathtub circuit 4. During this circulation, the heating circuit 3 is operated and the control valve 58 is kept open. After the control device 70 starts the circulation operation after such hot water filling, it monitors whether the hot water temperature detected by the bathtub return thermistor 65 has reached the target temperature. When it is confirmed that the hot water temperature has reached, the control device stops the bathtub circulation pump 55 and ends the automatic hot water filling. When the control device 70 ends the automatic hot water filling, it notifies the end of the automatic hot water filling with the hot water supply remote control 71 or the bathtub remote control 72.

[0056] (Automatic reheating operation) The control device 70 can perform control to automatically reheat (boil up) the water stored in the bathtub 52. For example, when the reheat switch provided on the hot water supply remote controller 71 or the bath remote controller 72 is pressed, the control device 70 sets the reheat temperature to the target temperature (e.g., 40°C) set on the hot water supply remote controller 71 or the bath remote controller 72 and starts the reheat. Specifically, the control device 70 ignites the heating burner 33A, opens the control valve 58, operates the bath circulation pump 55, and performs reheat by heating with the bath heat exchanger 50 while circulating the hot water in the bathtub 52. After starting such reheat, the control device 70 monitors whether the hot water temperature detected by the bath return thermistor 65 has reached the target temperature, and when it is confirmed that the target temperature has been reached, the control device 70 stops the bath circulation pump 55 and ends the reheat. When the control device 70 ends the reheat, it notifies the hot water supply remote controller 71 or the bath remote controller 72 of the end of the reheat.

[0057] (Heating operation) The control device 70 can perform a heating operation to supply a heat medium (e.g., hot water) to the heating terminal 39A or the heating terminal 39Z that functions as a heat dissipation terminal. For example, when the condition for supplying the heat medium to the heating terminal 39A is satisfied (e.g., when a heating instruction is received from the remote controller corresponding to the heating terminal 39A), the control device 70 ignites the heating burner 33A, operates the pump 37, and operates to supply the heat medium heated by the heating side heat exchanger 32 to the heating terminal 39A. Also, when the condition for supplying the heat medium to the heating terminal 39Z is satisfied (e.g., when a heating instruction is received from the remote controller corresponding to the heating terminal 39Z), the control device 70 ignites the heating burner 33A, operates the pump 37, opens the thermostatic valve 39G corresponding to the heating terminal 39Z, and operates to supply the heat medium heated by the heating side heat exchanger 32 to the heating terminal 39Z.

[0058] 3. Configuration of the housing 100 The water supply and heating unit 1 has an appearance as shown in FIG. 2 and includes a housing 100. The housing 100 constitutes the outer shell of the water supply and heating unit 1. Specifically, the housing 100 constitutes the front surface portion, upper surface portion, both side surface portions, rear surface portion, and bottom surface portion of the water supply and heating unit 1. The housing 100 is composed of, for example, mostly or entirely of a metal material. As shown in FIG. 2, the housing 100 has a housing body 102 (see FIG. 3) with an open front end side and a front cover 101 that opens and closes the housing body 102 from the front side. The housing 100 houses various components such as the water supply circuit 2, the bath circuit 4, and the heating circuit 3 shown in FIG. 1.

[0059] The housing 100 is box-shaped as a whole. As shown in FIG. 3, the housing body 102 includes an upper surface portion 102A, a pair of side surface portions 102B and 102C, a rear surface portion 102D, and a bottom surface portion 110. Each of the upper surface portion 102A, the pair of side surface portions 102B and 102C, the rear surface portion 102D, and the bottom surface portion 110 is configured in a plate shape and is formed as a metal plate by, for example, a metal material. The front end portions of the upper surface portion 102A, the pair of side surface portions 102B and 102C, and the bottom surface portion 110 form a front opening 104. As shown in FIGS. 2 and 3, the front cover 101 is attached to the housing body 102 so as to close the front opening 104 formed in the housing body 102 from the front side. The pair of side surface portions 102B and 102C extend from one side in the vertical direction to the other side and are arranged with the vertical direction as their respective longitudinal directions. The upper surface portion 102A and the bottom surface portion 110 extend from one side in the horizontal direction to the other side and are arranged with the horizontal direction as their respective longitudinal directions. The rear surface portion 102D is arranged so as to close the rear end side of the annular body constituted by the pair of side surface portions 102B and 102C, the upper surface portion 102A, and the bottom surface portion 110. The front opening 104 is the opening at the front end portion of the annular body.

[0060] As shown in FIGS. 3 and 4, the front cover 101 includes a main body portion 101A and a closing portion 103, and is configured as a plate as a whole. The front cover 101 is mounted so as to close the front opening 104, and is configured to be detached so as to open the front opening 104, and is detachably attached to the housing main body 102. The main body portion 101A is configured as a plate and is a portion that is detachably attached to the housing main body 102. The main body portion 101A is a portion obtained by removing the closing portion 103 from the front cover 101. The main body portion 101A has an opening 180. The opening 180 is provided in the main body portion 101A below the center position in the vertical direction of the main body portion 101A, specifically, at a position closer to the lower end portion of the main body portion 101A.

[0061] In this specification, the direction in which the pair of side surface portions 102B and 102C extend is the vertical direction. Specifically, when the hot water supply and heating device 1 is installed, the vertical direction is arranged so as to be the vertical direction. The plate thickness direction of the flat plate portion 142 in the fixing member 140 described later is the vertical direction, and the direction orthogonal to the upper plate surface of the flat plate portion 142 is the vertical direction. In this specification, the predetermined direction orthogonal to the above vertical direction is the front-rear direction. In the example shown in FIG. 2 and the like, the direction orthogonal to the flat surface constituting a part of the front surface of the main body portion 101A is the front-rear direction. The direction orthogonal to the above vertical direction and orthogonal to the above front-rear direction is the left-right direction. In the example shown in FIG. 3 and the like, the direction in which the pair of side surface portions 102B and 102C face each other is the left-right direction, and the longitudinal direction of the bottom surface portion 110 (the direction in which the bottom surface portion 110 extends) is the left-right direction.

[0062] The closing portion 103 is configured as a plate and is attached so as to close the opening 180 of the main body portion 101A. The closing portion 103 is constituted by, for example, a metal plate. A sealing material for enhancing waterproofness may be arranged between the back surface of the closing portion 103 and the front surface of the main body portion 101A (specifically, the front surface around the opening 180).

[0063] As shown in FIG. 3, a plurality (six in the example of FIG. 3) of thermostatic valves 39G are provided at predetermined positions of the housing 100. Each thermostatic valve 39G is configured to switch each internal branch passage 38F shown in FIG. 5 between a blocked state (a state in which the heat medium cannot be released to the outside through the internal branch passage 38F) and an open state (a state in which the heat medium can be released to the outside through the internal branch passage 38F).

[0064] 4. Configuration for Connecting the Wiring Portion L As shown in FIG. 6, a plate-shaped fixing member 140 is fixed to the upper surface of the bottom surface portion 110 in a configuration sandwiched between the plurality of thermostatic valves 39G and the bottom surface portion 110 below the plurality of thermostatic valves 39G. As shown in FIGS. 7 and 8, the fixing member 140 includes a flat plate portion 142 configured in a flat plate shape, a mounting portion 148 provided so as to bend from the flat plate portion 142, and a fixing portion 149 fixed while contacting the bottom surface portion 110. The fixing member 140 is, for example, a metal plate made of a metal material, and a part thereof is bent.

[0065] As shown in FIGS. 6 and 7, the flat plate portion 142 is arranged to be overlapped on the upper side of the bottom plate portion 110. In the present embodiment, the bottom plate portion 110 is configured in a plate shape, specifically, it is configured as a longitudinally extending metal plate in the left - right direction. One plate surface of the bottom plate portion 110 is an upper surface facing upward, which is the bottom surface of the inner wall surface of the housing 100. The other plate surface of the bottom plate portion 110 is a lower surface facing downward, which is the lower surface of the outer wall surface of the housing 100. On the other hand, the flat plate portion 142 is configured as a metal plate. In the configuration of FIGS. 6 and 7, the flat plate portion 142 and the bottom plate portion 110 are overlapped in a configuration where the lower plate surface of the flat plate portion 142 is in contact with the upper surface of the bottom plate portion 110. And a thermostatic valve - related component including a plurality of thermostatic valves 39G and components around them is arranged in contact with the upper surface of the flat plate portion 142. The flat plate portion 142 is provided with a plurality of through - holes 146 for inserting the internal branch passage 38F and a through - hole 147 for inserting a drain passage. On the other hand, the bottom plate portion 110 is provided with a through - hole 116 that constitutes an opening region overlapping the opening region of the plurality of through - holes 146, and a through - hole 117 that constitutes an opening region overlapping the opening region of the through - hole 147. The lower end portion of each internal branch passage 38F is configured in a shaft shape and is arranged to project downward through the through - hole 116 while being inserted into each through - hole 146. The drain passage is arranged to project downward through the through - hole 117 while being inserted into the through - hole 147.

[0066] As shown in FIGS. 6 to 8, the fixing portion 149 is configured as a bent piece of metal bent from the flat plate portion 142, and is overlapped while being in contact with the bent piece 119 provided on the bottom plate portion 110 as shown in FIGS. 6 and 7, and is fixed to the bent piece 119 by a connecting member such as a screw. By the fixing portion 149 contacting the bent piece 119, the bottom plate portion 110 and the fixing member 140 are electrically connected and kept at the same potential. Specifically, the housing 100 and the fixing member 140 are in an electrically connected state and are kept at about the same ground potential (for example, 0V).

[0067] As shown in FIG. 6, the attachment portion 148 is a portion for attaching the wiring portion L. As shown in FIGS. 6 to 8, the attachment portion 148 is configured as a metal bent piece bent from the flat plate portion 142, and is provided at a position in front of the hole portion 112 in the fixing member 140 as shown in FIG. 6. The wiring portion L is, for example, a ground wire, and is a wiring electrically connected in a configuration short-circuited to a grounding portion (a portion maintained at a ground potential) provided outside the water heater 1. The wiring portion L is configured to pass through a guide member 80 to be described later, and is attached so as to straddle the inside and outside of the housing main body 102. Since the attachment portion 148 is electrically connected to the housing 100 in a short-circuited configuration, when the wiring portion L is attached to the attachment portion 148 and the attachment portion 148 is grounded, the entire housing 100 is grounded.

[0068] As shown in FIG. 6, the guide member 80 is a member attached to the bottom surface portion 110 and is a member that forms a path for the wiring portion L to pass through. The guide member 80 is also a member that guides the wiring portion L to the front side when the wiring portion L is attached.

[0069] As shown in FIG. 9, a through hole portion 112 is provided in the bottom surface portion 110 of the housing main body 102. The hole portion 112 is configured to penetrate in the plate thickness direction of the bottom surface portion 110 configured in a plate shape, and communicates the space below the bottom surface portion 110 and the space above.

[0070] As shown in FIGS. 10 to 13, the guide member 80 is fixed to the housing main body 102 (specifically, the bottom surface portion 110) in a configuration inserted through the hole portion 112 from the outside (specifically, the lower side) of the housing 100. As shown in FIG. 12, the guide member 80 includes an upper guide portion 87 which is a portion inserted into the hole portion 112 at the time of attachment, an opposing portion 88 which is a portion facing the lower surface of the bottom surface portion 110, and a lower guide portion 89 provided below the opposing portion 88. The opposing portion 88 is configured as a flange portion configured to project outward from the lower end portion of the upper guide portion 87 and project outward from the upper end portion of the lower guide portion 89, and the upper surface of the opposing portion 88 is arranged to be in close contact with the lower surface of the bottom surface portion 110.

[0071] As shown in Fig. 14, the guide member 80 has an insertion passage 82 through which the wiring portion L is inserted, and further, an inlet 82A for introducing the wiring portion L into the insertion passage 82 and an outlet 82B for leading out the wiring portion L from the insertion passage 82 are provided. The insertion passage 82 is provided in each of the lower guide portion 89, the opposing portion 88, and the upper guide portion 87 and constitutes a communicating space passing through each of them. The inlet 82A is an opening that forms the inlet at the lower end of the insertion passage 82 and is configured as an opening at the lower end of the lower guide portion 89. The outlet 82B is an opening that forms the upper and front outlet of the insertion passage 82 and is configured as an opening on the upper and front sides of the upper guide portion 87.

[0072] As shown in Fig. 14, from the state of being detached from the bottom surface portion 110, the guide member 80 is inserted into the front end side and upper end side of the upper guide portion 87 as shown in Fig. 15. After hooking the front end portion of the hole portion 112 on the notch portion 90 described later as shown in Fig. 16, the opposing portion 88 is arranged so as to be in close contact with the lower surface of the bottom surface portion 110 as shown in Fig. 17, whereby it can be arranged in the normal position.

[0073] As shown in Fig. 17, inside the insertion passage 82 provided in the guide member 80, an insertion space 83 through which the wiring portion L passes from the inlet 82A provided at a position lower than the bottom surface portion 110 to the outlet 82B continues. The guide member 80 has an overall hollow cylindrical form. The outlet 82B is provided in the guide member 80 on the front side of the hole portion 112 and functions as an outlet for leading out the wiring portion L from the insertion passage 82. As shown in Fig. 17, the wiring portion L continues from below the inlet 82A, passes through the inlet 82A, and passes through the outlet 82B, and continues to the mounting portion 148 on the front side of the outlet 82B in a configuration where it is inserted through the insertion passage 82.

[0074] As shown in Fig. 17, the insertion passage 82 is provided with an upper inner wall portion 84 at a position above the bottom surface portion 110. The upper inner wall portion 84 covers the insertion space 83 from above and is configured to continue in front of the hole portion 112. The inner wall surface of the upper inner wall portion 84 is inclined so as to be in a front position as it goes upward. Specifically, the inner wall surface (lower surface) of the upper inner wall portion 84 is a forwardly rising inclined surface.

[0075] As shown in FIG. 4, in a state where the closing portion 103 (FIG. 2) is removed from the main body portion 101A of the front cover 101, the external space on the front side of the front cover 101 and the internal space in the housing main body 102 communicate with each other through the opening 180. And, as shown in FIG. 4, the guide member 80 is attached at a position near the front end of the bottom surface portion 110 on the rear side of the opening 180 (see also FIGS. 6 and 10). Specifically, the entire guide member 80 is disposed on the front side of the center position in the front-rear direction of the bottom surface portion 110. And, the entire opening 180 is disposed below the center position in the vertical direction of the front cover 101.

[0076] As shown in FIGS. 4 and 17, the mounting portion 148 has a mounting surface 148A for mounting the screw member 190 (FIG. 4) disposed facing the front side and the upper side. The mounting surface 148A is the front surface of the mounting portion 148 and is an inclined surface inclined with respect to the vertical direction. The mounting surface 148A is disposed facing the opening region side of the opening 180. As shown in FIG. 17, while the wiring portion L is in contact with the mounting surface 148A, the wiring portion L is attached to the mounting portion 148 by the screw member 190 (see FIG. 4, omitted in FIG. 17). The wiring portion L has, for example, a conductor exposed near the mounting portion 148, and this conductor extends from one end side to the other end side of the wiring portion L, and portions such as near the guide member 80 and the lower side thereof are covered with an insulating material (for example, a resin material). The conductor portion of the wiring portion L near the mounting surface 148A is fixed while being sandwiched between the screw head of the screw member 190 and the mounting surface 148A, and is electrically connected in a configuration that is short-circuited with respect to the screw member 190 or the mounting surface 148A. In the present embodiment, the screw portion of the screw member 190 (the portion where the screw groove is formed) and the screw hole in the mounting portion 148 (the portion into which the screw member 190 is inserted) are electrically connected in a configuration that is short-circuited.

[0077] FIG. 10 is a drawing showing the bottom surface portion and the guide member in plan view. The "outer shape of the hole portion 112" in FIG. 10 corresponds to the outer shape of the projected figure (virtual figure) obtained by projecting the inner peripheral surface of the hole portion 112 onto a virtual plane orthogonal to the vertical direction. And the "outer shape of the portion above the hole portion 112 in the guide member 80" in FIG. 10 corresponds to the outer shape of the projected figure (virtual figure) obtained by projecting the "portion above the hole portion 112 in the guide member 80" onto the above virtual plane. As shown in FIG. 10, the size of the outer shape (second outer shape) of the projected figure obtained by projecting the portion above the hole portion 112 in the guide member 80 onto the above virtual plane is larger than the size of the outer shape (first outer shape) of the projected figure obtained by projecting the inner peripheral surface of the hole portion 112 onto the above virtual plane. Specifically, the area of the inner region of the second outer shape is larger than the area of the inner region of the first outer shape, and the maximum length in the front-rear direction of the second outer shape is larger than the maximum length in the front-rear direction of the first outer shape. Further, the second outer shape is longer in the front-rear direction than the first outer shape.

[0078] As shown in FIGS. 12 and 17, the guide member 80 has an opposing portion 88 that faces the peripheral edge of the hole portion 112 on the lower surface of the bottom surface portion 110, and a pair of side wall portions 85 and 86 that extend upward from the opposing portion 88 (see also FIG. 3). An upper inner wall portion 84 is connected to the upper end side of each of the pair of side wall portions 85 and 86. The side wall portions 85 and 86 have upper extending portions 85X and 86X that extend upward, and front extending portions 85Y and 86Y that bend from the upper end sides of the upper extending portions 85X and 86X and extend forward. As shown in FIG. 12, the side wall portion 85 is provided with the upper extending portion 85X so as to extend upward from the opposing portion 88, and the front extending portion 85Y is provided so as to bend from the upper end side of the upper extending portion 85X and extend forward. The front extending portion 85Y extends and is arranged in front of the front end of the hole portion 112. Then, a recess 85A is formed by the front edge portion of the upper extending portion 85X and the lower edge portion of the front extending portion 85Y continuing from the front edge portion. As shown in FIG. 17, the side wall portion 86 is provided with the upper extending portion 86X so as to extend upward from the opposing portion 88, and the front extending portion 86Y is provided so as to bend from the upper end side of the upper extending portion 86X and extend forward. The front extending portion 86Y extends and is arranged in front of the front end of the hole portion 112. Then, a recess 86A is formed by the front edge portion of the upper extending portion 86X and the lower edge portion of the front extending portion 86Y continuing from the front edge portion.

[0079] And, near each boundary portion between each of the pair of side wall portions 85, 86 and the opposing portion 88, a notch portion 90 into which the front edge portion of the hole portion 112 fits is provided. As shown in FIG. 12, near each boundary portion between the side wall portion 85 and the opposing portion 88, a notch portion 90 into which the front edge portion of the hole portion 112 fits is provided. As shown in FIG. 17, near each boundary portion between the side wall portion 86 and the opposing portion 88, a notch portion 90 into which the front edge portion of the hole portion 112 fits is also provided (see also FIG. 14). Each notch portion 90 is configured as a recess that is recessed toward the rear side. On the other hand, as shown in FIGS. 17 and 18, in a first portion on the rear side of the hole portion 112 in the opposing portion 88, a fixed portion 88Z that is fixed by a connecting member to a second portion on the rear side of the hole portion 112 in the bottom surface portion 110 is provided. Specifically, the fixed portion 88Z is configured as a hole portion or a notch portion into which a connecting member such as a screw is inserted, and in the second portion of the bottom surface portion 110, a hole 118 (for example, a screw hole) for fixing while inserting a connecting member such as a screw is provided. As shown in FIGS. 17 and 18, in a state where the guide member 80 is arranged at the normal position, the front edge portion of the hole portion 112 fits into each notch portion 90, thereby restricting the vertical movement and the forward movement near the front end portion of the opposing portion 88. And, in the above normal position, the hole 118 and the fixed portion 88Z are vertically overlapped, and in this state, by inserting a connecting member 192 (see FIG. 5) such as a screw into the fixed portion 88Z and fixing it to the hole 118, the vertical movement and the rearward movement of the opposing portion 88 are restricted and fixed.

[0080] 5. Examples of Effects A hot water supply and heating unit 1, which is an example of a hot water supply device, can achieve a configuration in which a guide member 80 is attached to the bottom surface portion 110 of the housing 100 from the outside. Further, in the hot water supply and heating unit 1, an insertion passage 82 provided in the guide member 80 continues to an insertion space 83 from an inlet 82A located below the bottom surface portion 110 to an outlet 82B provided in front of the hole portion 112. Therefore, an operator can insert the wiring portion L from the outside of the lower side of the housing 100 into the housing 100 and guide it to the front side of the hole portion 112 by performing an operation of inserting the wiring portion L from the inlet 82A. Also, on the guide member 80, an upper inner wall portion 84 is provided above the bottom surface portion 110 so as to cover the insertion space 83 from above, and the upper inner wall portion 84 continues in front of the hole portion 112. Therefore, when the operator inserts the wiring portion L from the inlet 82A, after reaching the upper inner wall portion 84, this wiring portion L is likely to move forward without moving upward and is likely to be guided to the outlet 82B.

[0081] In the hot water supply and heating unit 1, since the inner wall surface of the upper inner wall portion 84 is inclined so as to be in a front position as it goes upward, when the operator inserts the wiring portion L from the inlet 82A, after reaching the upper inner wall portion 84, this wiring portion L is guided by the inner wall surface (inclined surface) of the upper inner wall portion 84 and is likely to move forward, and is even more likely to be guided to the outlet 82B.

[0082] In the hot water supply and heating unit 1, an opening 180 is provided at a position near the lower end of the main body portion 101A in the front cover 101 that constitutes the front surface portion of the housing 100, and the guide member 80 is configured to be attached at a position near the front end of the bottom surface portion 110 on the rear side of the opening 180. Due to such a configuration, when the closing portion 103 is removed and the external space in front of the front cover 101 and the internal space in the housing main body 102 communicate with each other through the opening 180, it is easy for the operator to access the guide member 80 through the opening 180. In particular, since the guide member 80 has an outlet 82B in front of the hole portion 112, the wiring portion L guided from the hole portion 112 to the front side is likely to be located near the opening 180, and it is easy for the operator to perform an operation on the wiring portion L.

[0083] In the water heater 1, since the mounting portion 148 is disposed on the front side of the hole portion 112 and the mounting surface 148A faces the front side and the upper side, an operator can more easily perform the operation of attaching a screw member to the mounting surface 148A for fixing the wiring portion L.

[0084] In the water heater 1, the size of the outer shape of the projection figure obtained by projecting the inner peripheral surface of the hole portion 112 onto a virtual plane orthogonal to the vertical direction is smaller than the size of the outer shape of the projection figure obtained by projecting the portion of the guide member 80 located above the hole portion 112 onto the virtual plane. Thus, in the water heater 1, the portion "located above the hole portion 112" mainly composed of the upper inner wall portion 84 can be made relatively larger, so that the portion for guiding the wiring portion L becomes larger, and the workability can be further improved.

[0085] In the water heater 1, due to the presence of the recesses 85A and 86A formed in each of the pair of side wall portions 85 and 86, the pair of side wall portions 85 and 86 can be made thinner, and it is easy to reduce the size of the hole portion 112.

[0086] In the water heater 1, a notch portion 90 into which the front edge portion of the hole portion 112 fits is provided in at least one of the pair of side wall portions 85 and 86 and the opposing portion 88. In a first portion on the rear side of the hole portion 112 in the opposing portion 88, a fixed portion 88Z fixed by a connecting member to a second portion on the rear side of the hole portion 112 in the bottom surface portion 110 is provided. Thus, in the water heater 1, the guide member 80 can be easily and stably fixed to the bottom surface portion 110 by the front fitting structure by the notch portion 90 and the rear fixing structure by the connecting member.

[0087] <Other Embodiments> The present invention is not limited to the embodiments described by the above description and drawings. For example, the features of the above-described or below-described embodiments can be combined in any combination within a non-contradictory range. Also, any feature of the above-described or below-described embodiments can be omitted if it is not explicitly specified as essential. Further, the above-described embodiments may be modified as follows.

[0088] In the above-described embodiment, the hot water heater 1 having the heating circuit 3 is exemplified as an example of the hot water supply device, but a hot water supply device without a heating circuit may also be used.

[0089] In the above-described embodiment, the hot water heater 1 provided with the bath circuit 4 is exemplified, but a hot water supply device without a bath circuit may also be used.

[0090] It should be noted that the embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed this time, and it is intended that all modifications within the scope shown by the claims or within the scope equivalent to the claims are included.

Explanation of Reference Numerals

[0091] 1: Hot water heater 2: Hot water supply circuit 80: Guide member 82: Insertion passage 82A: Inlet 82B: Outlet 83: Insertion space 84: Upper inner wall portion 85: Side wall portion 85A: Recess 85X: Upper extension portion 85Y: Front extension portion 86: Side wall portion 86A: Recess 86X: Upper extension portion 86Y: Front extension portion 87: Upper guide 88: Opposing portion 88Z: Fixed portion 89: Lower guide 90: Notch portion 100: Housing 101: Front cover 101A: Main body portion 102: Housing main body 102A: Upper surface portion 102B: Side surface part 102C: Side surface part 102D: Back surface part 103: Closing part 104: Front opening 110: Bottom surface part 112: Hole part 116: Through hole 117: Through hole 118: Hole 119: Bending piece 140: Fixing member 142: Flat plate part 146: Through hole 147: Through hole 148: Mounting part 148A: Mounting surface 149: Fixing part 180: Opening part 190: Screw member 192: Connecting member L: Wiring part

Claims

1. A water heating circuit that performs a water heating operation by burning gas, a housing body with an open front end, and a front cover that opens and closes the housing body from the front, and a housing that houses the water heating circuit, a wiring part attached so as to straddle the inside and outside of the housing body, a guide member fixed to the housing body and having an insertion passage through which the wiring part is inserted, and comprising: a through-hole is provided in the bottom surface portion of the housing body, the guide member is fixed in a configuration inserted through the hole from the outside of the housing, a lead-out port for leading out the wiring part from within the insertion passage is provided on the front side of the guide member relative to the hole, inside the insertion passage, an insertion space through which the wiring part passes extends from an inlet provided at a position lower than the bottom surface portion to the lead-out port, the insertion passage is provided with an upper inner wall portion at a position above the bottom surface portion, the upper inner wall portion covers the insertion space from above and continues on the front side of the hole, a water heater.

2. The inner wall surface of the upper inner wall portion is inclined so as to be in a front position as it goes upward. The water heater according to Claim 1.

3. The front cover has a main body portion having an opening and detachable from the housing body, and a closing portion attached to close the opening of the main body portion, the opening is provided at a position closer to the lower end of the main body portion, in a state where the closing portion is removed from the main body portion, the external space in front of the front cover and the internal space inside the housing body communicate with each other through the opening, the guide member is attached at a position near the front end of the bottom surface portion on the rear side of the opening, The water heater according to Claim 1 or Claim 2.

4. A fixing member is fixed to the bottom surface portion, an attachment portion for attaching the wiring part is provided in the fixing member at a position in front of the hole, the attachment portion is arranged such that the attachment surface for attaching the screw member faces forward and upward, the wiring part is attached to the attachment portion by the screw member while the wiring part is in contact with the attachment surface. The water heater according to Claim 3.

5. The size of the outer shape of the projection figure obtained by projecting the inner peripheral surface of the hole onto a virtual plane orthogonal to the vertical direction is smaller than the size of the outer shape of the projection figure obtained by projecting the portion of the guide member above the hole onto the virtual plane. The water heater according to Claim 1 or Claim 2.

6. The guiding member has an opposing portion that opposes the peripheral edge of the hole portion on the lower surface of the bottom surface portion, and a pair of side wall portions that extend upward from the opposing portion. The upper inner wall portion is connected to the upper end side of each of the pair of side wall portions. Each of the side wall portions has an upper extending portion that extends upward, and a front extending portion that bends from the upper end side of the upper extending portion and extends forward. A recess is formed by the front edge portion of the upper extending portion and the lower edge portion of the front extending portion that continues from the front edge portion. The water heater according to claim 1 or claim 2.

7. The guiding member has an opposing portion that opposes the peripheral edge of the hole portion on the lower surface of the bottom surface portion, and a pair of side wall portions that extend upward from the opposing portion. The upper inner wall portion is connected to the upper end side of each of the pair of side wall portions. In at least one of the pair of side wall portions and the opposing portion, a notch portion into which the front edge portion of the hole portion fits is provided. A fixed portion that is fixed by a connecting member to a second portion on the rear side of the hole portion in the bottom surface portion is provided at a first portion on the rear side of the hole portion in the opposing portion. The water heater according to claim 1 or claim 2.

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