JP2016118351A - Bath circulation flow channel switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bath circulation flow channel switching device capable of being installed regardless of installation environment.SOLUTION: A bath circulation flow channel switching device 1 is connected to an outer case projecting from a bathtub outer wall, and a bath circulation tool having a going-side connection pipe and a returning-side connection pipe extended along a substantial surface direction of the bathtub outer wall connected to the outer case, and disposed in a manner of penetrating through a bathtub wall surface. The switching device 1 includes a going flow channel having an outlet-side connection port 82c connected to the going-side connection pipe, a returning flow channel having an inlet-side connection port 84b connected to a returning-side connection pipe, a bypass flow channel connecting the going flow channel to the returning flow channel, and a flow channel switching mechanism portion 70 closing the bypass flow channel when a temperature of the circulated hot water is a prescribed temperature or higher, and opening the bypass flow channel and closing the going flow channel when the temperature of hot water is lower than the prescribed temperature. In a case of being connected to the bath circulation tool, a distance between the flow channel switching mechanism portion 70 and the bathtub outer wall is shorter than a distance between the outlet-side connection port 82c or the inlet-side connection port 84b, and the bathtub outer wall.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bath circulation channel switching device used in a bath hot water system having a reheating function.

  Conventionally, when residual water in the channel flows into the bath circulation channel switching device, the temperature-sensing switching valve blocks water from the forward channel to the bathtub, and flows to the return channel via the bypass channel. The technique to make is known (for example, refer patent document 1).

JP 2012-189232 A

  The bath circulation channel switching device is usually installed in a limited narrow space between the outer wall of the bathtub and the bathroom wall (for example, 200 mm). In some cases, obstacles are arranged around the bathtub or in the bathroom wall.

Here, when a valve that has many parts and a complicated structure is used for the valve opening / closing mechanism such as a temperature-sensitive switching valve, the opening / closing mechanism becomes large and the entire bath circulation flow path switching device It was difficult to downsize. For this reason, when the bath circulation channel switching device is actually installed in the above-described space, it may interfere with the bathroom walls and obstacles, making installation difficult. Moreover, even if it is going to install a bath circulation flow-path switching apparatus, it can install only in the thing where the outer wall of a bathtub, the wall of a bathroom, and space are ensured widely.
The present invention has been made in view of such circumstances, and an object thereof is to provide a bath circulation flow path switching device that can be installed regardless of the installation environment.

  In order to solve the above-described problem, a bath circulation channel switching device according to the present invention extends along a substantially surface direction of an outer case protruding from an outer wall of a bathtub and an outer wall of the bathtub connected to the outer case. A bath circulation channel switching device having a forward connection pipe and a return connection pipe and connected to a bath circulation device provided through the wall surface of the bathtub, and connected to the forward connection pipe A forward flow path having an outlet-side connection port, a return flow path having an inlet-side connection port connected to the return-side connection pipe, a bypass flow path connecting the forward flow path to the return flow path, and circulation A flow path switching mechanism that closes the bypass flow path when the temperature of hot water to be performed is equal to or higher than a predetermined temperature, and opens the bypass flow path and closes the forward flow path when the temperature of the circulating hot water is lower than the predetermined temperature And connected to the bath circulator Was the case, the distance between the outer wall of the tub and the flow path switching mechanism portion is less the distance between the outer wall of the said outlet connection port or the inlet-side connecting port tub.

  The bath circulation channel switching device according to the present invention can be installed regardless of the installation environment.

The schematic system block diagram of the bath hot-water supply system to which the bath circulation channel switching apparatus in this embodiment is applied. The external appearance perspective view of the bath circulation channel switching device in this embodiment. (A) is a block diagram of the bath circulation channel switching device connected to the bath circulator, (B) is a block diagram of FIG. 3 (A) viewed from the direction orthogonal to the bathtub outer wall. Sectional drawing of the bath circulation flow-path switching apparatus when the bypass flow path in alignment with the AA of FIG. 3 (B) is closed. Sectional drawing of the bath circulation flow-path switching apparatus when the bypass flow path in alignment with the AA of FIG. 3 (B) opens. It is a figure for demonstrating the effect of the switching apparatus in this embodiment, (A) is a block diagram of the bath circulation flow-path switching apparatus connected with the bath circulation tool, (B) is FIG. 6 (A). The block diagram seen from the direction orthogonal to.

An embodiment of a bath circulation channel switching device according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic system configuration diagram of a bath hot water supply system 2 to which a bath circulation channel switching device 1 according to the present embodiment is applied.

  The bath hot water system 2 includes a bathtub 4 provided in the bathroom 3, a bath water heater 5 (water heater 5) provided outside the bathroom 3, and a bath circulation channel 6 that connects the water heater 5 and the bathtub 4. And mainly.

  The bathtub 4 has a bath circulator 7 connected to the bath circulation channel 6. The bath circulator 7 is provided through the wall surface of the bathtub 4, and has a discharge port 7 a that discharges hot water (hot water or water) into the bathtub 4 and a suction port 7 b that sucks hot water in the bathtub 4. In the bathroom 3, a remote controller 8 for operating the water heater 5 and a currant 9 are provided.

  The water heater 5 has a hot water storage tank 11 for storing hot water. The hot water storage tank 11 includes a heater 12 that heats the hot water in the hot water storage tank 11, and a hot water storage temperature sensor 13 that detects the hot water storage temperature in the hot water storage tank 11. A water supply pipe 15 for supplying city water to the hot water storage tank 11 is connected to the bottom of the hot water storage tank 11. A hot water discharge pipe 16 for discharging hot water from the hot water storage tank 11 is connected to the top of the hot water storage tank 11. The hot water discharge pipe 16 is connected to a water supply bypass pipe 18 branched from the water supply pipe 15 via a hot water supply mixing valve 17.

  The hot water supply mixing valve 17 mixes the hot water from the water supply bypass pipe 18 and the hot water from the outlet pipe 16 so as to reach a hot water supply set temperature. A hot water supply pipe 19 is further connected to the hot water supply mixing valve 17, and the hot water mixed by the hot water supply mixing valve 17 is guided to the currant 9. The hot water supply pipe 19 is provided with a hot water supply temperature sensor 21 that detects the temperature of hot water and a hot water supply flow rate counter 22 that detects the amount of hot water supply. Further, the water supply pipe 15 is provided with a water supply temperature sensor 23 for detecting the water supply temperature.

  The bath circulation channel 6 mainly includes a return pipe 31, a bath heat exchanger 33, and an outgoing pipe 32. The return pipe 31 returns the hot water (tub water) of the bathtub 4 sucked from the suction port 7 b of the bath circulator 7 to the bath heat exchanger 33. The bath heat exchanger 33 is provided in the upper part of the hot water storage tank 11 and heats hot water. The forward pipe 32 supplies hot water heated by the bath heat exchanger 33 to the bathtub 4 side. The return pipe 31 is provided with a bath circulation pump 35 for sending hot water, a running water sensor 36 for detecting whether hot water is circulating, and a bath temperature sensor 37 for detecting the temperature of the circulating hot water. Further, the bath circulation channel 6 has a bath bypass pipe 40 that bypasses the return pipe 31 and the forward pipe 32 through the bath three-way valve 39. The bath three-way valve 39 switches whether hot water from the return pipe 31 is circulated to the bath heat exchanger 33 or bypassed to the forward pipe 32.

  The return pipe 31 is connected to a hot water filling pipe 41 branched from the hot water supply pipe 19 in order to supply hot water from the hot water supply pipe 19 to the bath circulation channel 6. The hot water filling pipe 41 prevents the hot water from flowing back from the return pipe 31, the hot water filling valve 42 that opens and closes the hot water filling pipe 41, the bath flow rate counter 43 that counts the amount of hot water supplied from the hot water filling pipe 41. And a check valve 44.

  The bath hot water supply system 2 includes a control unit 50 that electrically controls the bath hot water supply system 2. The control unit 50 has a calculation, a comparison, a storage function, and a clock function, and stores a program for controlling the water heater 5 in advance.

  The control unit 50 acquires detection values of the hot water storage temperature sensor 13, the hot water supply temperature sensor 21, the hot water supply flow rate counter 22, the hot water supply temperature sensor 23, the flowing water sensor 36, the bath temperature sensor 37, and the bath flow rate counter 43, and uses these detection values. Based on this, the heater 12, the hot water supply mixing valve 17, the bath circulation pump 35, the bath three-way valve 39, and the hot water filling valve 42 are controlled. Further, the control unit 50 receives a user instruction via the remote controller 8 and controls each unit to execute the instruction. In other words, the control unit 50 performs a hot water supply operation, a hot water filling operation, a bath reheating operation, and the like based on the hot water supply set temperature, the bath set temperature, the set hot water amount, etc., instructed by the remote controller 8.

  The bath circulation channel 6 includes a bath circulation channel switching device 1 disposed in the vicinity of the bath circulation tool 7 in the space behind the bathtub 4 in the bathroom 3.

FIG. 2 is an external perspective view of the bath circulation channel switching device 1 in the present embodiment.
FIG. 3A is a configuration diagram of the bath circulation channel switching device 1 connected to the bath circulation device 7, and FIG. 3B is a configuration diagram of FIG. 3A viewed from a direction orthogonal to the bathtub outer wall 4a. It is.
FIG. 4 is a cross-sectional view of the bath circulation flow path switching device 1 when the bypass flow path 63 along the line AA in FIG. 3B is closed.
FIG. 5 is a cross-sectional view of the bath circulation flow path switching device 1 when the bypass flow path 63 along the line AA in FIG.

  The bath circulation channel switching device 1 (switching device 1) is provided to prevent discharge of cold water from the bath circulation channel 6 to the bathtub 4. As illustrated in FIG. 3A, the switching device 1 mainly includes an outgoing flow path 61, a return flow path 62, a bypass flow path 63, and a flow path switching mechanism unit 70.

  The forward flow path 61 supplies hot water from the hot water heater 5 (heat source machine) side to the bathtub 4 side. The return flow path 62 supplies hot water from the bathtub 4 side to the hot water heater 5 side. The return flow path 62 extends in a substantially horizontal direction from the first horizontal flow path 65 extending substantially horizontally, the rising flow path 66 rising from the end of the first horizontal flow path 65, and the rising flow path 66 end. The second horizontal flow path 67 is provided in order from the bathtub 4 side.

  The bypass flow path 63 connects the forward flow path 61 to the return flow path 62 (rising flow path 66).

  As shown in FIGS. 4 and 5, the flow path switching mechanism unit 70 mainly includes a temperature-sensitive switching valve 71 and a valve box 72. The temperature-sensitive switching valve 71 includes a shape memory alloy compression coil spring 74 (SMA (Shape Memory Alloy) spring 74) that expands and contracts according to the temperature of flowing hot water, a valve body 75 that is moved by the SMA spring 74, and the valve body. And a bias spring 76 that biases 75 in a direction opposite to the biasing force of the SMA spring 74. The temperature-sensitive switching valve 71 has a preset load adjusting screw 77 that adjusts the biasing force of the bias spring 76. The temperature sensitive switching valve 71 is configured such that the moving direction of the valve body 75 (the urging direction of the SMA spring 74 and the bias spring 76) is substantially horizontal.

  The SMA spring 74 extends when the temperature is equal to or higher than a predetermined temperature and closes the bypass flow path 63, and contracts when the temperature is lower than the predetermined temperature and opens the bypass flow path 63. The valve body 75 moves due to the force relationship between the SMA spring 74 and the bias spring 76. When the bypass flow path 63 is closed, a later-described bypass pipe 95 and a switching device return pipe 84 (a portion serving as a partition wall 84e between the return flow path 62 and the bypass flow path 63) serve as valve seats. When the bypass channel 63 is opened, a connecting member 81 described later serves as a valve seat. Further, the valve box 72 is a tubular member whose tube axis extends in the substantially horizontal direction along the bathtub outer wall 4a when the switching device 1 is connected to the bath circulator 7. In the present embodiment, the connection member 81, the portion forming the inlet side connection port 82 b of the switching device forward pipe 82, and the bypass pipe 95 function as the valve box 72 of the temperature sensitive switching valve 71.

  The SMA spring 74 has a low temperature feeling for the user even if it flows into the bathtub 4 and is lower than the temperature of the hot water supplied to the bathtub 4 that can be arbitrarily set by the user (bath set temperature). (For example, 30 ° C.) is designed as the shape recovery temperature as the predetermined temperature. Under an atmosphere lower than the shape recovery temperature, the biasing force of the SMA spring 74 is weaker than the biasing force of the bias spring 76, and the SMA spring 74 is pushed by the bias spring 76 and contracts. Under an atmosphere at or above the shape recovery temperature, the urging force of the SMA spring 74 is stronger than the urging force of the bias spring 76, and the SMA spring 74 extends against the bias spring 76.

Next, the configuration of the switching device 1 will be described in more detail.
The forward flow path 61 includes a connection member 81 and a switching device forward pipe 82. The connection member 81 is a member that connects the forward tube 32 and the switching device forward tube 82. The switching device outgoing pipe 82 includes an outlet side connection port 82 c and includes a horizontal pipe 82 a having a tube axis substantially the same as the pipe axis of the outgoing side connection pipe 7 c of the bath circulator 7. That is, when the switching device 1 is connected to the bath circulator 7, the horizontal pipe 82 a has a substantially horizontal pipe axis extending along the bathtub outer wall 4 a.

  The connection member 81 is connected to the forward pipe 32 of the bath circulation channel 6 through the inlet side connection port 81a. The connection member 81 is connected to the inlet side connection port 82b of the switching device forward pipe 82 at the outlet side connection port 81b. The switching device outgoing pipe 82 (horizontal pipe 82a) is connected to the outgoing side connection pipe 7c at the outlet side connection port 82c. Further, the connection member 81 has a forward flow path port 81 c at a connection portion with the switching device forward pipe 82. As shown in FIG. 3, since the tube axis of the connection member 81 and the tube axis of the horizontal tube 82a are formed in different vertical planes, the forward flow path port 81c has hot water flowing from the connection member 81 to the horizontal tube 82a. It is formed so as to flow in the direction of about 45 ° in the radial cross section (the direction of 45 ° diagonally to the left in FIG. 3B).

  Here, the forward flow path 61 is formed when the bypass flow path 63 is closed as shown in FIG. That is, when the temperature of the hot water flowing through the flow path switching mechanism unit 70 is equal to or higher than a predetermined temperature (when the SMA spring 74 extends above the predetermined temperature), the valve body 75 is connected to the bypass pipe 95 serving as a valve seat and the switching device. It abuts on the return pipe 84 and closes the bypass flow path 63. Note that the “outward flow path” of the switching device 1 is not limited to the above-described configuration, and may include a part of the forward pipe 32 or a downstream flow path from the switching apparatus forward pipe 82.

  The return flow path 62 includes a switching device return pipe 84 that partially includes an elbow portion. The switching device return pipe 84 forms a first horizontal flow path 65, a rising flow path 66, and a second horizontal flow path 67. The switching device return pipe 84 includes an inlet side connection port 84b, and includes a horizontal pipe 84a having a pipe axis substantially the same as the pipe axis of the return side connection pipe 7d of the bath circulator 7. That is, the horizontal pipe 84a has a substantially horizontal pipe axis extending along the bathtub outer wall 4a. The switching device return pipe 84 includes an elbow pipe (elbow portion) 90 that forms a part of the rising flow path 66 and the second horizontal flow path 67.

  The switching device return pipe 84 (horizontal pipe 84a) is connected to the return side connection pipe 7d and the inlet side connection port 84b. The switching device return pipe 84 is connected to the elbow inlet side connection port 90a (one end of the elbow pipe 90) at the outlet side connection port 84c, and at the elbow outlet side connection port 90b (the other end of the elbow pipe 90). Connected to the return pipe 31 of the path 6. Further, the switching device return pipe 84 has a bypass channel port 84 d at a connection portion between the first horizontal channel 65 and the rising channel 66. The “return flow path” of the switching device 1 is not limited to the above configuration, and may include a flow path upstream of the switching device return pipe 84 or a part of the return pipe 31.

  The bypass flow path 63 includes a valve body 75, a bypass pipe 95 (including a portion that becomes a partition wall 84e between the return flow path 62 and the bypass flow path 63), a flow path side surface 77a of the preset load adjusting screw 77, and a bypass. It is comprised with the flow-path opening 84d. As shown in FIG. 3, since the pipe axis of the bypass pipe 95 and the pipe axis of the horizontal pipe 84a are formed in different vertical planes, the bypass flow passage port 84d receives hot water flowing from the bypass pipe 95 to the horizontal pipe 84a. It is formed so as to flow in the direction of about 45 ° in the radial cross section (upwardly 45 ° in the leftward direction in FIG. 3B). Here, the bypass flow path 63 is formed when the bypass flow path 63 is opened and the forward flow path 61 is closed as shown in FIG. That is, when the temperature of the hot water flowing through the flow path switching mechanism 70 is lower than a predetermined temperature (when the SMA spring 74 contracts lower than the predetermined temperature), the valve body 75 contacts the connection member 81 as a valve seat. The bypass channel 63 is opened, and the forward channel 61 is closed.

  Such a switching device 1 prevents discharge of cold water from the bath circulation flow path 6 to the bathtub 4 by the return flow path 62 that functions as a steam-water separator. That is, by providing the rising flow channel 66 between the first horizontal flow channel 65 and the second horizontal flow channel 67 and forming a height difference between the first horizontal flow channel 65 and the second horizontal flow channel 67, The air in the bathtub 4 can be mainly sucked without circulating a small amount of residual water in the first horizontal flow path 65 in the return pipe 31 when the bath circulation pump 35 is driven. Such a steam / water separation unit can prevent circulation only with residual water in the bath circulation channel 6 when the bathtub 4 is in an empty state, for example.

  In addition, the one where the internal diameter of the 1st horizontal flow path 65 and the internal diameter of the standing flow path 66 are larger exhibits the function of a steam-water separation part. Further, the first horizontal flow path 65 and the second horizontal flow path 67 are not completely horizontal, and may be accompanied by a slight inclination. Further, the rising channel 66 preferably rises substantially perpendicular to the first horizontal channel 65 and the second horizontal channel 67, but the first horizontal channel 65 and the second horizontal channel 67 have a height difference. If possible, it may stand up at an angle other than vertical.

  The switching device 1 in this embodiment is excellent in that it can be installed without depending on the space between the bathtub outer wall 4a and the bathroom wall 3a. This point will be specifically described below.

  As shown in FIG. 3, the bath circulator 7 includes a forward connection pipe 7 c, a return connection pipe 7 d, and an outer case 7 e on the bathtub outer wall 4 a side. The forward side connection pipe 7c and the return side connection pipe 7d extend along a substantially surface direction of the bathtub outer wall 4a (the horizontal direction shown in FIG. 3A), and each pipe axis is substantially horizontal along the bathtub outer wall 4a. Is a tube. The forward connection pipe 7c and the return connection pipe 7d are connected to the outer case 7e. The outer case 7e is a member that protrudes from the bathtub outer wall 4a with a certain width.

  The locations connected to the forward connection pipe 7c and the return connection pipe 7d are the outlet side connection port 82c of the switching device forward pipe 82 of the switching device 1 and the inlet side connection port 84b of the switching device return pipe 84, respectively. In the connection relationship between the bath circulator 7 and the switching device 1, these connected portions are the portions with the largest overhang.

  On the other hand, in the switching device 1, as shown in FIG. 2, the flow path switching mechanism portion 70 including a plurality of parts is the portion with the largest outer diameter. Between the bathtub outer wall 4a and the bathroom wall 3a where the switching apparatus 1 is installed is a limited narrow space of about 200 mm, for example. For this reason, the connection location of the bath circulator 7 and the switching device 1 and the arrangement of the flow path switching mechanism 70 in the switching device 1 have a great influence when the switching device 1 is installed.

  Here, when the switching device 1 in the present embodiment is connected to the bath circulator 7, the distance d between the flow path switching mechanism 70 and the bathtub outer wall 4a is connected to the outlet side as shown in FIG. It comprised so that it might become below the distance D of the opening 82c or the inlet side connection port 84b, and the bathtub outer wall 4a. The distance d is defined by the outer end 70f of the flow path switching mechanism 70. The distance D is defined by the outer end portions 82f and 84f of the outlet side connection port 82c and the inlet side connection port 84b. Further, the tube axis of the valve box 72 is located closer to the bathtub outer wall 4a side than the tube axis of each horizontal pipe 82a, 84a in which the outlet side connection port 82c and the inlet side connection port 84b are formed. That is, the tube axis of the valve box 72 is substantially parallel to the tube axis of each horizontal tube 82a, 84a in which the outlet side connection port 82c and the inlet side connection port 84b are formed, and the tube axis of each horizontal tube 82a, 84a. It is outside the vertical plane including Thereby, the flow path switching mechanism unit 70 can at least partially overlap the outer case 7e, and the switching device 1 can be efficiently arranged in a narrow space even if the outer shape of the flow path switching mechanism unit 70 is large. it can.

  For example, FIG. 6 is a figure for demonstrating the effect of the switching apparatus 1 in this embodiment, (A) is a block diagram of the bath circulation flow-path switching apparatus 100 connected with the bath circulation tool 7, FIG. 6B is a configuration diagram of FIG. 6A viewed from a direction orthogonal to the bathtub outer wall 4a. In addition, about the structure and part corresponding to the switching apparatus 1, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  When the tube axis of the switching device forward pipe 82 and the switching device return pipe 84 and the tube axis of the valve box 72 are substantially parallel and arranged on the same vertical plane, the flow path switching mechanism 70 is connected to the bathroom wall 3a. Will interfere. Or, in order to install the switching device 100 without interference, a wider space is required as an installation environment. However, the switching device 1 in the present embodiment is configured to be shifted to the bathtub outer wall 4a side when the flow path switching mechanism unit 70 is installed, so that the outer end portion 70f does not interfere with the bathroom wall 3a. Thereby, since the installation environment should just be determined in consideration of the dimension of the connection location of the bath circulator 7 and the switching device 1, it can be installed in a more limited space, thereby regardless of the installation space. Can be installed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, if the tube axis of the valve box 72 is displaced with respect to the tube axes of the horizontal tubes 82a and 84a, and the maximum diameter portion of the valve box 72 is slightly displaced toward the bathtub outer wall 4a, it is shown in FIG. The distance d may be larger than the distance D. That is, the outer end 70f of the flow path switching mechanism 70 (valve box 72) that defines the distance d is more than the outer ends 82f and 84f of the outlet side connection port 82c and the inlet side connection port 84b that define the distance D. It may be on the bathroom wall 3a side. Even if the distance d is larger than the distance D, if the tube axis of the valve box 72 is shifted to the bathtub outer wall 4a side with respect to the tube axes of the horizontal tubes 82a and 84a, This is to contribute to the reduction of installation dimensions.

  Further, in the present embodiment, the example in which the tube axes of the horizontal tubes 82a and 84a are in the same plane in the vertical direction has been described. However, when they are not in the same plane, the distance D is the outer end portions 82f and 84f. Are defined by outer end portions 82f and 84f that increase the distance from the bathtub outer wall 4a during installation.

  In this embodiment, instead of the SMA spring 74, the temperature-sensitive switching valve 71 expands when the temperature is higher than the temperature corresponding to the shape recovery temperature, and when the temperature is lower than the temperature corresponding to the shape recovery temperature. A shrinking wax thermoelement may be used.

  Moreover, although the return flow path 62 demonstrated the example which has the 1st horizontal flow path 65, the rising flow path 66, and the 2nd horizontal flow path 67, the switching apparatus whose pipe axis is a substantially horizontal direction along the bathtub outer wall 4a. If the return pipe 84 is included, the rising channel 66 is not essential. In addition, the direction of the second horizontal flow path 67 is set to be a direction parallel to the forward flow path 61 (forward pipe 32) and the first horizontal flow path 65. It may be stretched.

  In addition, the water heater 5 as a heat source device is provided with a heat pump type heating device outside the hot water storage tank 11 to circulate and heat the hot water in the hot water storage tank 11, or the bath heat exchanger 33 is arranged outside the hot water storage tank 11. In addition, the hot water in the hot water storage tank 11 is configured to circulate to the primary side of the bath heat exchanger, or the instantaneous heat exchanger (bath heat exchanger) for heating the water supply or bath water with a gas burner or an oil burner is provided. It may be configured.

1 Bath circulation channel switching device (switching device)
2 Bath hot water system 3 Bathroom 3a Bathroom wall 4 Bathtub 4a Bathtub outer wall 5 Bath water heater (water heater)
6 Bath Circulation Channel 7 Bath Circulation Tool 7c Outward Connection Pipe 7d Return Side Connection Pipe 7e Outer Case 31 Return Pipe 32 Outbound Pipe 61 Outbound Channel 62 Return Channel 63 Bypass Channel 70 Channel Switching Mechanism Unit 71 Temperature Switching Valve 72 Valve box 81 Connection member 82 Switching device forward pipe 84 Switching device return pipe 95 Bypass pipe

Claims (5)

An outer case protruding from the outer wall of the bathtub, and a forward connection pipe and a return connection pipe extending along a substantially surface direction of the outer wall of the bathtub connected to the outer case and penetrating the wall surface of the bathtub A bath circulation channel switching device connected to a bath circulator provided,
A forward flow path having an outlet side connection port connected to the forward connection pipe;
A return flow path having an inlet side connection port connected to the return side connection pipe;
A bypass flow path connecting the forward flow path to the return flow path;
A flow path switching mechanism that closes the bypass flow path when the temperature of the flowing hot water is equal to or higher than a predetermined temperature and opens the bypass flow path and closes the forward flow path when the temperature of the flowing hot water is lower than the predetermined temperature With
When connected to the bath circulator, the distance between the flow path switching mechanism and the outer wall of the bathtub is not more than the distance between the outlet side connection port or the inlet side connection port and the outer wall of the bathtub. Channel switching device. The distance between the flow path switching mechanism and the outer wall of the bathtub is defined by the outer end of the flow path switching mechanism,
The bath circulation channel switching according to claim 1, wherein a distance between the outlet side connection port or the inlet side connection port and the outer wall of the bathtub is defined by an outer end of the outlet side connection port or the inlet side connection port. apparatus. Each tube in which the outlet side connection port and the inlet side connection port are formed has substantially the same tube axis as the forward side connection tube and the return side connection tube,
The flow path switching mechanism includes a temperature-sensitive switching valve that opens and closes the bypass flow path, and a tubular valve having a tube axis that is substantially parallel to the tubes in which the outlet side connection port and the inlet side connection port are formed. With a box,
When connected to the bath circulator, the tube shaft of the valve box is located on the outer wall side of the bathtub with respect to the tube shaft of each tube in which the outlet side connection port and the inlet side connection port are formed. The bath circulation channel switching device according to claim 1.   4. The bath circulation channel switching device according to claim 2, wherein the temperature-sensitive switching valve is a valve having a shape memory alloy compression coil spring or a wax thermo element. An outer case protruding from the outer wall of the bathtub, and a forward connection pipe and a return connection pipe extending along a substantially surface direction of the outer wall of the bathtub connected to the outer case and penetrating the wall surface of the bathtub A bath circulation channel switching device connected to a bath circulator provided,
A forward flow path including a pipe having an outlet-side connection port connected to the forward-side connection pipe and having a tube axis substantially the same as the pipe axis of the forward-side connection pipe;
It has the inlet side connection port connected to the return side connection pipe, is substantially the same as the pipe axis of the return side connection pipe, and is flush with the pipe axis of the pipe in which the outlet side connection port is formed. A return flow path including a tube having a tube axis therein;
A bypass flow path connecting the forward flow path to the return flow path;
A temperature-sensitive switching valve that closes the bypass flow path when the temperature of the flowing hot water is equal to or higher than a predetermined temperature, and opens the bypass flow path and closes the forward flow path when the temperature of the flowing hot water is lower than the predetermined temperature And a tubular valve box having a tube axis that is substantially parallel to a tube axis of each of the tubes in which the outlet side connection port and the inlet side connection port are formed and in a plane different from the plane including the tube axis A bath circulation channel switching device.

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