JP2022104343A - Drain trap with heat exchange function - Google Patents

Abstract

To provide a novel heat exchanger structure that can be easily installed in a bathroom.SOLUTION: A drain trap 20 with a heat exchange function comprises: a trap body 34 capable of storing water inside to form sealing water; a washing area drain inflow port 43 formed on a top surface of the trap body 34; and an outflow port 42 for draining drainage from the trap body 34. A bottom surface of the trap body 34 is formed of a heat transfer member that transfers heat of the drainage inside the trap body 34 to the outside of the trap body 34. The drain trap 20 with a heat exchange function further comprises a water supply pipe 50 arranged so as to make thermal contact with the heat transfer member.SELECTED DRAWING: Figure 3

Description

The present invention relates to a drain trap capable of reusing the heat of drain.

Currently, under the initiative of the government, efforts are being made to popularize the Net Zero Energy House (ZEH). ZEH means "to significantly improve the heat insulation performance of the outer skin, and to introduce renewable energy after realizing significant energy saving while maintaining the quality of the indoor environment by introducing a highly efficient equipment system. This is a housing that aims to reduce the balance of annual primary energy consumption to zero. " The Ministry of Economy, Trade and Industry has set the goal of "realizing ZEH in the majority of custom-built detached houses built by house makers by 2020," and house makers and others have various technologies to realize ZEH. Is under development.

As a technique for realizing energy saving in a house, there is a technique for reusing wastewater heat (see, for example, Patent Document 1). The hot water supply device described in Patent Document 1 includes a hot water supply pipeline that supplies water from a water supply source such as a water supply via a water heater, and a water supply pipe that supplies water from a water supply source without passing through a water heater. A hot water supply device provided with a passage and configured to supply hot water from a hot water supply pipeline and water from a water supply pipeline through a hot water mixing tap or without mixing, and is a hot water supply pipeline or water supply. An exhaust heat recovery unit is provided in the pipeline to exchange and recover the heat of used hot wastewater, and the water that has passed through the exhaust heat recovery unit is supplied to the hot water mixing tap via the hot water supply pipeline or the water supply pipeline. It is composed.

Registered Utility Model No. 3149968

In the hot water supply device disclosed in Patent Document 1, the exhaust heat recovery unit is a heat exchanger having a double pipe structure in which the drain pipe forming the inner pipe is surrounded by the water supply pipe forming the outer pipe, and flows through the drain pipe. The heat of the hot drainage is conducted to the water supply flowing through the water supply pipe through the drainage pipe and the water supply pipe.

However, in the hot water supply device disclosed in Patent Document 1, since the heat exchanger is usually provided in the drain pipe arranged under the floor surface, it is not easy to retrofit the existing bathroom. There are challenges.

The present disclosure has been made in view of such problems, and an object thereof is to provide a new heat exchanger structure that can be easily attached to a bathroom.

The drain trap with heat exchange function according to the present disclosure consists of a trap body capable of storing water inside to form a sealed water, a washing place drainage inlet formed on the top surface of the trap body, and the trap body. It is equipped with an outlet for draining wastewater. At least a part of the trap body is formed of a heat transfer member that transfers the heat of the drainage inside the trap body to the outside of the trap body. The drain trap with heat exchange function further includes a water supply pipe arranged so as to make thermal contact with the heat transfer member.

It is a figure which shows typically an example of the hot water supply system to which a drain trap with a heat exchange function is applicable which concerns on embodiment. It is a schematic perspective view of the bathroom in which the drain trap with a heat exchange function is arranged which concerns on embodiment. It is a perspective view of the drain trap with a heat exchange function which concerns on embodiment. It is an exploded perspective view of the drain trap with a heat exchange function which concerns on embodiment. It is an exploded vertical sectional view of the drain trap with a heat exchange function which concerns on embodiment. It is a figure for showing the shape of a bathtub drainage inlet. It is a figure for showing the shape of a bathtub drainage inlet.

FIG. 1 schematically shows an example of a hot water supply system to which a drain trap with a heat exchange function according to an embodiment can be applied.

The hot water supply system 10 shown in FIG. 1 includes water supply pipes 12 and 14 for supplying water, a hot water supply pipe 13 for supplying hot water heated by the hot water supply device 11, and a drainage pipe 18 for discharging drainage. A drain trap 20 with a heat exchange function for heating the water supplied from the water supply pipe 14 by drainage, water heated by the drain trap 20 with a heat exchange function, and hot water heated by the hot water supply device 11. It is provided with a flow control mechanism 30 for controlling the flow rates of water and hot water so that the temperature of the hot water is maintained when the hot water mixed with and is supplied. The hot water supplied while being maintained at a constant temperature by the flow rate control mechanism 30 is discharged from, for example, a faucet 16 or a shower 17 installed in the bathroom 41 and used by the user.

Conventionally, in a bathroom, generally, when a user is using a faucet 16 or a shower 17, the temperature of the discharged hot water hardly drops, that is, the heat is hardly used in the bathroom. It was discharged from the washing place drain port 19 installed in. Further, when the hot water is drained from the bathtub 22, the heat is hardly used and is discharged from the bathtub drain port 21 of the bathtub 22. Therefore, in the hot water supply system 10 according to the present disclosure, the wastewater discharged while being warm is introduced into the drain trap 20 with a heat exchange function, and is used to heat the water supplied to the curan 16 and the shower 17 in use. .. As a result, the temperature of the water mixed with the hot water can be raised, and the amount of hot water required to maintain the temperature of the discharged hot water can be reduced, so that energy consumption can be reduced.

As described above, the temperature of the water heated by the heat of the drainage in the drain trap 20 with a heat exchange function and supplied from the water supply pipe 15 may fluctuate depending on the temperature and amount of the drainage, but the hot water supply system 10 Then, since the flow rate control mechanism 30 automatically controls the flow rates of water and hot water to maintain the temperature of the hot water constant, the hot water having a stable temperature is discharged from the curan 16 or the shower 17. This makes it possible to improve the convenience of the user and, by extension, promote the spread of the hot water supply system 10 capable of reducing energy consumption.

The flow rate control mechanism 30 may be any mechanism that can automatically control the flow rate of water or hot water, and may be a mechanism that controls the flow rate mechanically or electrically. As a mechanism for mechanically controlling the flow rate, for example, a thermostatic faucet may be used. Further, as a mechanism for electrically controlling the flow rate, for example, a valve capable of automatically controlling opening and closing, such as a solenoid valve or an electric valve, may be used.

FIG. 2 is a schematic perspective view of the bathroom 41 in which the drain trap 20 with a heat exchange function according to the embodiment is arranged.

As shown in FIG. 2, an apron 26 is erected between the washing place pan 24 forming the washing place and the bathtub 22, and the washing place drain port 19 is installed in the washing place pan 24 on the apron 26 side. In the washing place drainage port 19, a drainage basin 28 is formed in a concave shape integrally with the washing place pan 24, and a drainage trap 20 with a heat exchange function is connected to the lower part of the drainage basin 28. A drainage port cover 27 is laid on the upper part of the drainage basin 28.

A drainage pipe 29 is connected to the side surface of the drain trap 20 with a heat exchange function, and the drainage pipe 29 communicates with the tub drainage port 21 provided on the bottom surface of the tub 22 to allow the tub drainage in the tub 22 to flow. It flows into the drain trap 20 with a heat exchange function through the drain pipe 29.

Further, the drainage trap 20 with a heat exchange function is provided with an opening (washing place drainage inflow port) for washing place drainage inflow, in which drainage from the washing place pan 24 side passes through the drainage basin 28 and flows in from above. A drainage pipe 18 is connected to the peripheral side surface of the drainage trap 20 with a function so that drainage can be performed through the drainage pipe 18.

FIG. 3 is a perspective view of the drain trap 20 with a heat exchange function according to the embodiment. Further, FIG. 4 is an exploded perspective view of the drain trap 20 with a heat exchange function according to the embodiment. Further, FIG. 5 is an exploded vertical sectional view of the drain trap 20 with a heat exchange function according to the embodiment.

The drain trap with a heat exchange function includes a trap body 34 capable of storing water inside and forming a sealing water. A washroom drainage inlet 43 is formed on the top surface of the trap body 34. A flange member 32 is attached to the drainage basin 28, the upper end of the trap body 34 is attached to the flange member 32 with a screw, and a hair catcher 36 is detachably attached to the inside of the flange member 32 from above.

The hair catcher 36 has a substantially truncated cone shape whose diameter is reduced downward, and is attached so that the bottom surface of the lower end thereof is located directly above the sealing surface of the sealing water stored in the trap body 34. The hair catcher 36 is attached to the flange member 32 so that the hair catcher 36 does not rise even when the eddy current rises.

A bathtub drainage inlet 38 (see FIGS. 6 and 7) for allowing drainage from the bathtub 22 to flow into the trap body 34 is formed on the side surface of the trap body 34. 6 and 7 are diagrams for exemplifying the shape of the bathtub drainage inlet 38. The bathtub drainage inlet 38 is formed in a vertically elongated shape extending in the vertical direction (that is, the vertical width is larger than the horizontal width of the water flow port cross section), and the flow velocity of the inflowing bathtub drainage is increased from the bathtub side. It is formed so that the flow path width W becomes narrower toward the trap body 34 side. A connecting portion 40 is continuously connected to the bathtub drainage inlet 38 so as to project outward, and a drainage pipe 29 is connected to the connecting portion 40 from the bathtub 22 side. In the present embodiment, the connecting portion 40 is formed as a part of the trap main body, but the connecting portion 40 may be an independent member as long as the watertightness is maintained.

Further, on the side surface of the trap main body 34, an outlet 42 for draining drainage from the trap main body 34 is formed on the side substantially opposite to the bathtub drainage inlet 38, and the drain pipe 18 is formed at this outlet 42. Be connected.

On the upstream side of the outflow port 42, a water-sealing wall 44 is formed integrally rising from the bottom surface of the trap body 34, and the upper end of the water-sealing wall 44 serves as a water-sealing surface. On the upstream side of the water sealing wall 44, a shielding member 46 is vertically installed from the top surface 33 of the trap main body 34. The shielding member 46 is vertically installed so as to be inclined in an enlarged diameter from the lower end side to the upper side, and is continuous with the inner peripheral surface 34a of the trap main body 34 and has a substantially circular inner peripheral surface in a plan view. Is arranged in a curved shape with respect to the bathtub drainage inlet 38 so as to form the above. The shielding member 46 divides the inside of the trap body 34 into an inflow chamber R1 and an outflow chamber R2, and the inflow chamber R1 and the outflow chamber R2 communicate with each other between the lower end of the shielding member 46 and the bottom surface of the trap body. A communication portion P to be made is formed.

In such a configuration, when the drain plug of the bathtub 22 is opened and the bathtub water in the bathtub 22 passes through the drainage pipe 29 at once and flows into the trap body 34 from the bathtub drainage inlet 38, the bathtub drainage is collected in the trap body 34. The shield member 46 swirls along the inner peripheral surface 34a and the shielding member 46 to form a vortex, and the generated vortex is inclined in an enlarged diameter (the inclined surface faces diagonally upward) from the lower end side to the upper side. Therefore, it is guided by the shielding member 46 to form an ascending vortex and ascends. If the inclination angle of the shielding member 46 is set so that the rising vortex flow rises to the vicinity of the drain port cover 27 on the upper surface of the drainage basin 28, the rising vortex flow adheres to the inner peripheral surface of the drainage basin 28 and the hair catcher 36. The dust and hair are well removed, the dust and hair are collected in the center of the vortex and fall downward from the center of the vortex, and the dust and hair are well collected in the center of the bottom of the lower end of the hair catcher 36. Will be done. As a result, the hair catcher 36 is kept in a state where no hair is attached to other than the central portion thereof, and the water flow is improved. Further, the slime adhering to the inner peripheral surface 34a of the trap body 34 can be removed, and a part of the vortex flows through the communication portion P between the lower end of the shielding member 46 and the bottom surface, and the inner peripheral surface of the water sealing wall 44. You can also remove slime.

In the drain trap 20 with a heat exchange function according to the embodiment, since the bathtub drainage inlet 38 is formed in a vertically long shape (the vertical width is larger than the horizontal width of the water flow port cross section) as described above, the bathtub 22 The drainage from the trap body 34 can be stabilized by increasing the momentum of the drainage from the trap body 34.

In a general drain trap, almost all of the trap body is made of a resin member. On the other hand, in the drain trap 20 with a heat exchange function according to the embodiment, the bottom surface portion 34b of the trap main body 34 is formed of a heat transfer member, and the other portion of the trap main body 34 is formed of resin. The heat transfer member may be a metal member having high thermal conductivity such as copper or aluminum. For example, when copper is used, slime can be reduced. Hereinafter, the bottom surface portion formed of the heat transfer member is referred to as a “heat transfer bottom surface portion 34b”. The heat transfer bottom surface portion 34b transfers the heat of the drainage inside the trap body 34 to the outside of the trap body 34. Such a resin molded product partially formed of a metal member can be manufactured by performing insert molding.

As shown in FIG. 4, the heat transfer bottom surface portion 34b may be provided with a plurality of fins 48 inside the trap body. By providing the fins 48, the heat exchange efficiency can be improved. It should be noted that the shape, size, arrangement, etc. of the fins 48 do not adversely affect the generation of eddy currents in the trap body 34.

The drain trap 20 with a heat exchange function according to the embodiment further includes a water supply pipe 50 at the lower part of the trap main body 34. The water supply pipe 50 is arranged so as to be in thermal contact with the heat transfer bottom surface portion 34b of the trap main body 34. The water supply pipe 50 is formed in a meandering shape that is a combination of a curved portion and a straight portion so as to have as many portions as possible in thermal contact with the heat transfer bottom surface portion 34b.

One end 50a of the water supply pipe 50 is connected to the water supply pipe 14 (see FIG. 1), and the other end 50b is connected to the water supply pipe 15 (see FIG. 1). The water supplied from the water supply pipe 14 to one end 50a of the water supply pipe 50 is heated by the heat from the heat transfer bottom surface portion 34b while flowing through the water supply pipe 50, and is heated from the other end 50b of the water supply pipe 50. It is discharged. The hot water discharged from the other end 50b of the water supply pipe 50 is supplied to the flow rate control mechanism 30 via the water supply pipe 15.

The drain trap 20 with a heat exchange function according to the embodiment further includes a heat insulating member 52 that covers the water supply pipe 50. By covering the water supply pipe 50 with the heat insulating member 52, the efficiency of heat exchange from the drainage to the water supply can be improved.

The configuration of the drain trap 20 with a heat exchange function according to the embodiment has been described above. In the drain trap 20 with a heat exchange function, the bottom surface portion of the trap body 34 is a heat transfer bottom surface portion 34b, and a water supply pipe 50 is provided so as to be in thermal contact with the heat transfer bottom surface portion 34b. When the user uses the faucet 16 or the shower 17, the washing place drainage flows into the trap main body 34 from the place drainage inlet 43. The heat of the washing place drainage can be transferred to the water supply flowing through the water supply pipe 50 via the heat transfer bottom surface portion 34b. Further, when the user drains hot water from the bathtub 22, the bathtub drainage flows into the trap main body 34 from the bathtub drainage inlet 38. The heat of the bathtub drainage can be transferred to the water supply flowing through the water supply pipe 50 via the heat transfer bottom surface portion 34b. Energy consumption can be reduced by mixing the hot water heated by the water supply pipe 50 with the hot water heated by the hot water supply device 11 (see FIG. 1).

The drain trap 20 with a heat exchange function according to the embodiment has a structure in which the bottom surface portion of the trap main body 34 is a heat transfer bottom surface portion 34b and a water supply pipe 50 is provided so as to be in thermal contact with the heat transfer bottom surface portion 34b. Therefore, the change in shape and size from the conventional drain trap that does not have a heat exchange function is small. Therefore, no large-scale construction is required, and installation work at the place where the conventional drain trap was installed is easy.

Further, in the drain trap 20 with a heat exchange function according to the embodiment, since the washing place drainage and the tub drainage are heat-exchanged by the drain trap, the length of the flow path from the exhaust hot water source of the tub or the washing place to the heat exchanger. Can be shortened. As a result, the heat loss of the wastewater is reduced, so that the heat exchange efficiency can be improved as compared with the case where the heat exchanger is arranged downstream of the drain trap.

Further, in the drain trap 20 with a heat exchange function according to the embodiment, since the heat transfer bottom surface portion 34b is interposed between the drain flow path and the water supply flow path, the cross connection between the drainage and the water supply is ensured. Can be prevented.

Further, the drain trap 20 with a heat exchange function according to the embodiment is configured to generate a vortex in the trap main body 34 by the bathtub drainage from the bathtub drainage inlet 38. When such a vortex is generated, the heat exchange efficiency can be improved as compared with the case where no vortex is generated. This is because the flow velocity becomes faster due to the generation of the eddy current, so that the thickness of the temperature boundary layer near the heat transfer surface decreases and the amount of heat transfer increases.

In the above-described embodiment, the bottom surface of the trap body 34 is formed of a heat transfer member, but at least a part of the trap body 34 is formed of a heat transfer member, and the water supply pipe is in thermal contact with the part. It suffices to arrange 50. For example, in addition to the bottom surface portion of the trap main body 34, the side surface portion may be formed of a heat transfer member, and the water supply pipe 50 may be arranged so as to be in thermal contact with the side surface portion.

The present invention has been described above based on the embodiments. It will be appreciated by those skilled in the art that this embodiment is exemplary and that various modifications and modifications are possible within the claims of the invention and that such modifications and modifications are also within the claims of the present invention. Where is it? Therefore, the descriptions and drawings herein should be treated as exemplary rather than limiting.

10 Hot water supply system, 11 Hot water supply device, 12, 14, 15, 50 Water supply pipe, 16 curan, 17 Shower, 18 Drain pipe, 20 Drain trap, 21 Drainage outlet, 22 Drainage outlet, 27 Drainage outlet cover, 28 Drainage basin, 30 Flow control mechanism, 32 Flange member, 34 Trap body, 34b Heat transfer bottom part, 36 Hair catcher, 38 Bath drainage inlet, 41 Bathroom, 43 Washroom drainage inlet, 44 Water seal wall, 48 fins, 52 Insulation member.

Claims (5)

A trap body that can store water inside and form a seal,
The washing place drainage inlet formed on the top surface of the trap body and
An outlet for draining drainage from the trap body,
Equipped with
At least a part of the trap body is formed of a heat transfer member that transfers the heat of the drainage inside the trap body to the outside of the trap body.
A drain trap with a heat exchange function, further comprising a water supply pipe arranged so as to be in thermal contact with the heat transfer member. The drain trap with a heat exchange function according to claim 1, wherein the bottom surface of the trap body is formed of the heat transfer member. A bathtub drainage inlet for allowing drainage from the bathtub to flow into the trap body,
A vortex generating portion that generates a vortex in the trap body by drainage from the bathtub drainage inlet, and
The drain trap with a heat exchange function according to claim 1 or 2, further comprising. The drain trap with a heat exchange function according to any one of claims 1 to 3, further comprising a heat insulating member covering the water supply pipe. The drain trap with a heat exchange function according to any one of claims 1 to 4, wherein the heat transfer member includes fins inside the trap body.

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