CA3111404A1

CA3111404A1 - Exchanger for vertical drainpipe and washbasin employing same

Info

Publication number: CA3111404A1
Application number: CA3111404A
Authority: CA
Inventors: Woo-Seung Shin; Hong-Suk Lee
Original assignee: ISOOIN CO Ltd
Current assignee: ISOOIN CO Ltd
Priority date: 2018-07-20
Filing date: 2019-07-08
Publication date: 2020-01-23
Also published as: WO2020017803A1; KR101935281B1

Abstract

Disclosed are a heat exchanger for a vertical drainpipe and a washbasin employing same. The heat exchanger for a vertical drainpipe according to the invention comprises: an upper cover having a tube shape and having a diffusion portion provided on the bottom surface thereof so as to slope outwards; a front cover and a rear cover having semi-cylindrical shapes, the front cover and the rear cover being coupled to the upper cover and coupled to each other so as to form a cylinder-type exterior having a cavity at the center thereof, coupling racks being formed on outer ends of the front cover and the rear cover, respectively; a lower cover having a tube shape, the lower cover being coupled to the lower portion of the cylinder formed by coupling of the front cover and the rear cover; and a coil tube contained in a housing formed by coupling of the upper cover, the front cover, the rear cover, and the lower cover. Both ends of the coil tube contained in the housing are fitted to cylindrical through-holes formed through outer peripheral surfaces of the upper and lower portions of the front cover or the rear cover in the horizontal direction such that the two ends protrude outwards. A high-temperature fluid widely flows down along the diffusion portion of the upper cover, and flows down along the surface of the coil tube, thereby exchanging heat therewith.

Description

EXCHANGER FOR VERTICAL DRAINPIPE AND WASHBASIN EMPLOYING
SAME
Field of the Invention The present invention relates to a heat exchanger for a vertical drainage pipe and a wash basin using the same, and more particularly, relates to a heat exchanger for a vertical drain pipe and a wash basin using the same to reduce the energy cost required to make hot water by easily recovering and utilizing heat from household sewage generated in daily life in winter.
Background Technology The use of heat from sewage is a very old and common technical field.
However, when looking for practical examples, it is mostly used in large commercial facilities such as factories with high temperature of the generated sewage or public saunas where a large amount of sewage is generated, and it is rarely utilized in each home or small commercial building.
When looking at heat exchangers for household sewage that have been known at domestic and abroad so far, it is divided into two types: installed outside the building and installed inside the building.
(Prior Art 1) To install the heat exchanger outside the building, it is a method of using a horizontal pipe, which is a sewage pipe discharged from the building to the outside, and a water supply pipe supplied to the building is embedded inside the horizontal pipe. Various types are used depending on the material of the pipe or the arrangement and shape of the water supply pipe.
International Publication No. WO 2011/132156 discloses a method of extracting heat from wastewater flowing in a horizontal pipe.
Fig 1 is a view showing a heat exchanger for household sewage that extracts heat from wastewater flowing in a horizontal pipe installed outside a building according to the prior art.
Referring to FIG. 1, in order to extract heat from the wastewater 1 flowing in the horizontal pipe 2, a heat exchanger E immersed in the wastewater 1 is installed at the bottom of the horizontal pipe. The estimated maximum level la of wastewater is indicated by a dotted line.

Date Recue/Date Received 2021-03-02 The heat exchanger E is composed of tubes 3 and is coated with sufficient thermally conductive material 4 around the tubes. The top surface 5 of the thermally conductive material 4 comes into direct contact with the wastewater 1 flowing in the thorizontal pipe.
(Prior Art 2) The most representative method of installing a heat exchanger in a drainage path adjacent to an individual water supply device inside a building is for a shower booth.
The method widely known in Europe is to form a space under the floor plate and a copper pipe for water supply is arranged in a coil shape under the plate. The drained sewage is uniformly spread and drained to the center over a wide plate with good heat conduction under the floor.
UK Patent Application Publication No. 2376517 discloses a system for recovering heat energy from a shower tray.
Fig 2 is a diagram showing an apparatus for recovering heat from a shower tray according to the prior art.
Referring to FIG. 2, hot water heated by the heater 6 and supplied from the shower head 7 directly falls to the shower tray 8, and the water supply pipe 9 is coiled in the shower tray 8. The water supply pipe 9 is arranged to recover heat.
Heat recovered water is supplied back to the heater 6 through the water supply pipe.
Although it is not known whether it is actually used in Korea, Korean Patent Registration No. 10-1418072 discloses a bathroom waste heat recovery system that heats cold water supplied to a bathroom by using heat from wastewater used and discharged from the bathroom.
Fig 3 is a block diagram of a bathroom waste heat recovery system according to the prior art.
Referring to Fig 3, the bathroom waste heat system 10 includes a mixing part 11, a cold water supply pipe 12, a hot water supply pipe 13, a first heat exchange part 15a, a second heat exchange part 15b, and a third heat exchange part 15c.
The first heat exchange part 15a is provided for heat exchange between cold water and waste water discharged through the bathroom floor drain 16 and includes a first circulation pipe 17 and a first heat exchanger 18. The first heat exchanger 18 is installed on the bathroom floor drain 16. A flow path through which cold water supplied from the first circulation pipe 17 is provided inside the bathroom floor drain

2 Date Recue/Date Received 2021-03-02 16. The cold water and wastewater discharged through the bathroom floor drain are heat-exchanged.
The second heat exchanger 15b is provided for heat exchange of hot water stored in the bathtub 19, and the third heat exchanger 15c is provided for heat exchange of cold water and wastewater discharged to the bathtub drain.
(Prior Art 3) Another method of heat exchanger using a shower booth is to raise the floor of the shower booth to a certain height, collect sewage at one end, and send it to a rectangular space. Inside this space, a winding drainage path and a water supply pipe are formed.
Korea Patent Registration No. 10-1406437 discloses a waste heat recovery device configured directly under the drain of the bathroom or kitchen for each household to recover heat from household waste hot water and supply lukewarm water to the cold water supply pipe.
Fig 4 is a view showing a state of use of the waste heat recovery device according to the prior art.
Referring to Figure 4, the lukewarm water supply device using a waste heat recovery device consists of a mixed faucet (a) for supplying cold and hot water alone or mixed, a hot water pipe (al) connected to the mixed faucet (a) and receiving hot water through the main hot water pipe (33) connected to the boiler, a cold water pipe (a2) connected to the mixed faucet (a) and receiving cold water from the main cold water pipe (35), and drainage trap (a3) of each household that drains wastewater discharged from the mixed faucet (a). A waste heat recovery device 30 is provided directly under the drain trap a3 so that the wastewater from the drain trap a3 is collected and then drained. The cold water pipe (a2) is divided and the segmented cold water pipe (a2) is connected to a heat exchange pipe (37) installed in the waste heat recovery device (30).
The waste hot water used for showering, washing dishes, etc. in the bathroom or kitchen is drained into the drain trap a3. The waste heat recovery device receives the waste hot water directly from the drain trap and converts cold water into lukewarm water of a certain temperature and supplies to the heat exchange pipe installed therein.
(Prior Art 4) As another example, it is not confirmed whether it is used in the actual market,

3 Date Recue/Date Received 2021-03-02 there is an example of configuring a heat exchanger adjacent to the kitchen sink.
For example, the bowl of the kitchen sink is made of thin metal, and it is made double so that water flows inside. In other words, it is a structure that transfers the heat of sewage contained in the bowl to the internal water supply.
German Patent Application Publication No. 3045116 discloses a sink having at least one sink bowl in a kitchen.
Fig 5 is a view showing a sink having a double jacket for kitchen according to the prior art.
Referring to FIG. 5, the sink 40 has a bowl 41 composed of a double jacket composed of an inner jacket 42 and an outer jacket 43, and the inner jacket 42 constitutes a wall of the sink. A cavity is formed between the inner jacket 42 and the outer jacket 43, and a heat exchange fluid flows inside it.
(Prior Art 5) As an example of the sink heat exchanger, there is a structure in which a drain pipe in the shape of a P-type trap is formed just below the drain of the sink, the water supply pipe going inside is wound in a coil shape, and the inlet and outlet are pulled out of the drain pipe.
UK Patent Application Publication No. 2376517 cited in the above-described prior art 2 discloses a system for recovering thermal energy from waste hot water.
Fig 6 is a view showing a heat exchanger coupled to the outlet of the sink according to the prior art.
Referring to FIG. 6, a cylindrical container 58 is mounted under the sink 54 by a conventional nut 50, and a heat exchanger is provided inside the container.
The lower part of the cylindrical container 58 is blocked by the end wall 52, and there is a hole in the center of the wall 52, through which the outlet pipe 55 is connected. The outlet pipe 55 forms a curve 56 to form a P-type trap to achieve normal drainage.
The inside of the container is provided with a heat exchanger passing through the wall 52 to form a coiled heat exchange tube 51 inside the container and passing through the outlet 57 of the upper part of the container. Cold water is provided at the inlet of the heat exchange tube 51 (It enters through 53) and goes out to the outlet 57 and is connected to a heater (boiler). The extension of the outlet pipe 55 is bent 59 having a trap shape so as to be at the same level as the upper portion of the container 58, so that the waste hot water from the sink is maintained in the container 56.

4 Date Recue/Date Received 2021-03-02 (Prior Art 6) There is a product under the brand called "Power-Pipe", that is a heat exchanger actually commercialized in the US market.
This product uses a vertical pipe that collects sewage from each floor of the building and sends it down. A large diameter copper pipe with good heat conduction is used as a vertical pipe, and a small diameter copper pipe for water supply is wound on the outside.
Fig 7 is a view showing a power pipe type heat exchanger according to the prior art.
Referring to FIG. 7, waste hot water is discharged through the drain pipe 61, and a power pipe 60 in the form of a coil tube is installed outside the drain pipe 61 to form a heat exchanger. The water supply 62 is preheated with lukewarm water after heat exchange through the power pipe 60 and is introduced into the heater 65 through the heater inlet 63, and additionally heated hot water is discharged to the heater outlet 67. It supplies hot water to the house.
(Prior Art 7) In addition, relatively recently, Dyson Technology Limited of the UK applied for a patent for heat exchange technology for hand washing. The bowl of the sink is made of a thin material and convex in a double structure, and the water outlet of the faucet is located above the center. The water supply flows inside the double-structured bowl. Hot water drops from the faucet, wash your hands, and the water that flows down falls to the center of the bowl, spreads radially, and flows down to the outside of the bowl. At this time, the water flows inside the double structure to exchange heat.
UK Patent Publication No. 2497530 discloses a wash basin.
Fig 8 is a view showing a sink for heat exchange according to the prior art.
Referring to FIG. 8, the sink 70 includes a bowl 72 and a water jet 74. The bowl 72 has a circular boundary and is divided into a bottom surface 73 and a side wall 75, and includes a drain 76 for discharging used water. The bowl 72 has a central protrusion 79, and water from the faucet flows along the central protrusion 79.
The bowl 72 includes a heat exchange part, which forms a bottom surface 73 and a side wall 74, is formed of a plurality of layers, and water flows into the plurality of layers.
Although there are various types of heat exchanger products and

5 Date Recue/Date Received 2021-03-02 technologies as in the prior art 1 to 7 described above, they are still hardly used in homes or small commercial buildings around our lives. The reason is that the temperature of sewage generated in homes or small commercial buildings is not as high as 20-35V, and the amount is small and irregular, so it is less economical by existing heat exchangers. In addition, the existing heat exchanger has many difficulties in maintenance such as removing contaminants such as biofilm.
Therefore, in order to easily realize the use of heat from household sewage in a home or small business building, an economical structure must be presented that can optimize the shape and size according to the characteristics of each water supply device and facilitate the removal of pollutants must be presented.
Detailed description of the invention Technical purpose The present invention was conceived in consideration of the above-described problems, and its purpose is to reduce the energy cost required to make hot water by easily recovering and utilizing heat from household sewage generated in homes or small commercial buildings in daily life in winter. It is to provide a heat exchanger for a vertical drain pipe and a heat exchanger for a wash basin using the same.
Technical Solution The heat exchanger for a vertical drainage pipe according to the present invention for solving the above problems comprise an upper cover, as a tubular shape, having a diffuser inclined to the outside to the bottom surface; a front cover and a rear cover coupled to the upper cover and having a semi-cylindrical shape, which are coupled to each other to form a cylindrical appearance with a central hole, and have a coupling rod formed at an outer end thereof; a tubular lower cover coupled to a lower portion of the cylinder to which the front cover and the rear cover are coupled; and a coil pipe accommodated in a housing formed by combining the upper cover, the front cover, the rear cover, and the lower cover; both ends of the coil pipe accommodated in the housing are inserted into the upper and lower portions of the front cover or the rear cover with cylindrical through holes formed in a horizontal direction on each outer circumferential surface and protrude to the outside, the high-temperature fluid flows widely along the diffusion part of the upper cover, characterized in that heat exchange is performed while the high-temperature fluid

6 Date Recue/Date Received 2021-03-02 flows in the form of a thin film in contact with the surface of the coil pipe and the opposite surface of fluid in contact with air.
Preferably, the heat exchanger comprises an outer support jaw is protruding from the outer circumferential surface of the upper cover, an outer support jaw is protruding from the outer circumferential surface of the lower cover, characterized in that the outer support jaw on the outer circumferential surfaces of the upper cover and the lower cover are fitted into fixing grooves on the inner side of the upper and lower ends of the front cover and the rear cover, respectively, so that their positions are restricted to form a housing.
Preferably, the upper cover, further comprises a groove-shaped washing water conduit formed in the outer central portion of the upper cover; a washing water inlet formed in the front cover or the rear cover communicating with the washing water conduit; and a plurality of nozzles penetrating from the lower portion of the washing water conduit to the diffusion part.
Preferably, the heat exchanger characterized in that each of the coupling rod is coupled with the left and right plate packings interposed therebetween, the upper cover and the lower cover have an 0-ring type packing fitted into the grooves on the upper and lower ends of the upper and lower covers to prevent leakage of sewage.
Preferably, the heat exchanger characterized in that the left and right plate packing has a concave portion formed to correspond to the outer supporting jaw protruding to the outside, and at the same time, a protrusion protruding in the direction of the 0-ring type packing.
The wash basin using the heat exchanger for a vertical drain pipe according to the present invention for solving the above other problems comprise a wash basin;
a drain port under the wash basin; a washbasin drain valve installed at the drain port;
a heat exchanger for vertical piping installed below the wash basin drain valve; and a trap connected to the lower portion of the heat exchanger, wherein the heat exchanger is composed of an upper cover, as a tubular shape, having a diffuser inclined to the outside to the bottom surface; a front cover and a rear cover coupled to the upper cover and having a semi-cylindrical shape, which are coupled to each other to form a cylindrical appearance with a central hole, and have a coupling rod formed at an outer end thereof; a lower cover coupled to a lower portion of the cylinder to which the front cover and the rear cover are coupled, and comprising a tubular upper pipe and a water sealing pipe extending below the upper pipe; a coil

7 Date Recue/Date Received 2021-03-02 pipe accommodated in a housing formed by combining the upper cover, the front cover, the rear cover, and the lower cover; both ends of the coil pipe accommodated in the housing are inserted into the upper and lower portions of the front cover or the rear cover with cylindrical through holes formed in a horizontal direction on each outer circumferential surface and protrude to the outside, the high-temperature fluid flows widely along the diffusion part of the upper cover, characterized in that heat exchange is performed while the high-temperature fluid flows in the form of a thin film in contact with the surface of the coil pipe and the opposite surface of fluid in contact with air.
Preferably, the wash basin using a heat exchanger, wherein the wash basin drain valve is composed of a stopper and a drain pipe coupled to the stopper, characterized in that the stopper has a circular fixing stand connected to a plurality of support legs obliquely descending from the center to the outside.
Preferably, the wash basin using a heat exchanger, wherein the upper cover, further comprise a groove-shaped washing water conduit formed in the outer central portion of the upper cover; a washing water inlet formed in the front cover or the rear cover communicating with the washing water conduit; and a plurality of nozzles penetrating from the lower portion of the washing water conduit to the diffusion part.
Preferably, the wash basin using a heat exchanger characterized in that an outer support jaw is protruding from the outer circumferential surface of the upper cover, an outer support jaw is protruding from the outer circumferential surface of the lower cover, characterized in that the outer support jaw on the outer circumferential surfaces of the upper cover and the lower cover are fitted into fixing grooves on the inner side of the upper and lower ends of the front cover and the rear cover, respectively, so that their positions are restricted to form a housing.
Preferably, the wash basin using a heat exchanger, wherein the trap is composed of trap body; and a water sealing cup connected to the lower portion of the trap body, characterized in that the trap body comprises a circular inlet that is tightly coupled with an 0-ring type packing connected to the sealing pipe of the lower cover; and an outlet through which the wastewater introduced into the inlet port flows out through the water sealing cup.
Preferably, the wash basin using a heat exchanger, characterized in that each of the coupling rod is coupled with the left and right plate packings interposed therebetween, the upper cover and the lower cover have an 0-ring type packing

8 Date Recue/Date Received 2021-03-02 fitted into the grooves on the upper and lower ends of the upper and lower covers to prevent leakage of sewage.
Preferably, the wash basin using a heat exchanger characterized in that the left and right plate packing has a concave portion formed to correspond to the outer supporting jaw protruding to the outside, and at the same time, a protrusion protruding in the direction of the 0-ring type packing.
Advantageous Effects According to the present invention having the configuration as described above, it is possible to reduce the energy cost required to make hot water by easily recovering and utilizing heat from domestic sewage generated in homes or small commercial buildings in everyday life in winter.
In addition, it is possible to provide a heat exchanger for vertical drainage pipes that can be installed in a general wash basin without any special restrictions on material or shape, is economical with a structure that is easy to produce, and is very simple to maintain and manage such as high temperature part cleaning.
Description of Drawings The above object and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
Fig. 1 is a view showing a heat exchanger for domestic sewage that extracts heat from wastewater flowing in a horizontal pipe installed outside a building according to the prior art.
Fig. 2 is a diagram showing an apparatus for recovering heat from a shower tray according to the prior art.
Fig. 3 is a block diagram of a bathroom waste heat recovery system according to the prior art.
Fig. 4 is a view showing a state of use of the waste heat recovery device according to the prior art.
Fig. 5 is a view showing a sink having a double jacket for kitchen according to the prior art.
Fig. 6 is a view showing a heat exchanger coupled to the outlet of the sink according to the prior art.

9 Date Recue/Date Received 2021-03-02 Fig. 7 is a view showing a power pipe type heat exchanger according to the prior art.
Fig. 8 is a view showing a sink for heat exchange according to the prior art.
Fig. 9 is a view showing an installation state of a general wash basin before implementing the heat exchanger of the present invention.
Fig. 10 is a view showing the installation of the heat exchanger for a vertical drain pipe according to an embodiment of the present invention in a wash basin.
Fig. 11 is an exploded perspective view of a heat exchanger for a vertical drain pipe for a wash basin according to an embodiment of the present invention.
Fig. 12 is an enlarged view showing an upper cover of a heat exchanger fora vertical drain pipe for a wash basin according to an embodiment of the present invention.
Fig. 13 is a cross-sectional view taken along line A-A' of FIG. 10.
Fig. 14 is a perspective view showing a tightly coupled structure of a heat exchanger housing according to an embodiment of the present invention.
Fig. 15 is a cross-sectional view showing a tightly coupled structure in a horizontal direction and a vertical direction using a conventional technique.
Fig. 16 is a cross-sectional view showing before and after screwing the tightly coupled structure of the heat exchanger housing as a part [A] of Fig. 14.
Fig. 17 is a cross-sectional view illustrating a heat exchange action according to an embodiment of the present invention.
Fig. 18 is a cross-sectional view of a method for cleaning high temperature part contaminants in a heat exchanger according to an embodiment of the present invention.
Fig. 19 is a cross-sectional view showing a method of washing a high-temperature part of a heat exchanger by spraying a high-speed fluid according to an embodiment of the present invention.
Fig. 20 is a bottom view of an upper cover of a heat exchanger according to an embodiment of the present invention.
Fig. 21 is a cross-sectional view showing a heat exchanger for a vertical drain pipe according to another embodiment of the present invention.
Fig. 22 is an exploded perspective view of Fig. 21.
Fig. 23 is a cross-sectional view showing a heat exchanger for a vertical drain pipe according to another embodiment of the present invention.
Date Recue/Date Received 2021-03-02 Fig. 24 is an exploded perspective view of Fig. 23.
Best Mode Hereinafter, a heat exchanger for a vertical drain pipe and a heat exchanger for a wash basin using the same according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Specifically, before describing the present invention, the above-described conventional techniques are limited to heat exchangers and sinks for vertical drainage pipes, and the reason why they are not widely commercialized will be described in more detail.
In the present invention, the portion where sewage, which is a high-temperature fluid flows, is referred to as a 'high-temperature portion'.
The portion where the water supply, which is a low-temperature fluid flows is referred to as a low-temperature portion'. The pipe forming the boundary between them is called a wall'. Heat is transferred by convection between the hot fluid and the wall surface, conduction inside the wall, and again by convection between the wall surface and the cold fluid. The heat transfer rate for a unit temperature difference per unit surface area between a fluid and a solid surface is called the 'heat transfer coefficient'.
Therefore, in a heat exchanger, the high-temperature 'heat transfer coefficient' and the low-temperature 'heat transfer coefficient' are very important factors.
The effect of reducing the heat transfer rate due to the accumulation of contaminants adhering to the surface of the wall is called the 'polluting coefficient'. In the high temperature portion, contaminants such as biofilms accumulate because water contaminated with people and detergents such as soap flows.
The heat exchanger of the prior art 1 to 3 is a separate technology from the heat exchanger for vertical drainage pipe and the wash basin of the present invention, and thus a description thereof will be omitted.
Prior Art 4 is practical only when the bowl material is a metal type having excellent thermal conductivity, but most washbasins are made of porcelain, so it is difficult to be widely used.
Conventional technology 5 is a technology to utilize the heat of sewage generated from the sink. It is a structure in which the thin water supply pipe inside the P-type trap-shaped drain pipe is wound in a coil type. Therefore, the flow velocity near the high-temperature portion surface is very slow, and the convective heat Date Recue/Date Received 2021-03-02 transfer coefficient becomes very small. In addition, the slow flow rate on the high-temperature portion increases the adhesion of contaminants such as biofilms, so that the contamination coefficient quickly increases and the heat transmission rate decreases. Furthermore, in the prior art 5, there is no specific method of how to insert and seal the coil-type water supply pipe into the drain pipe. Actually, such a basic shape appears in a number of patent documents, like the third heat exchange part denoted by reference numeral 15c in FIG. 3 of the prior art 2, but most of them lack specificity. It is very difficult in actual production to put the coiled pipe in close contact with the inner wall of the straight pipe, which is a cylindrical container, and to pull the inlet and outlet pipe out of the straight pipe in the right angle direction.
Usually, the straight pipe, which is a metal, is partially cut and divided, the coil pipe is placed inside and welded again.
For this reason, the structure of winding a coil tube outside the straight tube as in the prior art 6 is considered to be practical. However, in this case, the thickness of the wall is doubled and thermal resistance of the joint between the two pipes is generated. It is economically very disadvantageous because it is necessary to use a material such as copper having excellent thermal conductivity for the sewage pipe, which is a straight pipe. In addition, since the straight pipe with a smooth surface has a small convective heat transfer coefficient, there is a problem that the length must be lengthened for effectiveness.
Prior art 7 is a modified case of prior art 4, premised on a wash basin for washing hands, discarding the shape of a bowl containing water, and applying a hemispherical inverse shape. The scope of use of this type is extremely limited as the function of containing water is inherently impossible. Nevertheless, presenting such a structure has the advantage that the convection heat transfer coefficient of the high temperature portion is large because the flow of sewage has a free surface and flows thin and fast like a thin film. In addition, there is an advantage in that there is no need to consider the contamination coefficient because the high-temperature portion is completely exposed to the outside to facilitate cleaning.
However, this structure has a small convective heat transfer coefficient on the low-temperature portion that must flow between the thin wall surfaces. In addition, in general, since the space where the washbasin is installed is insufficiently heated and there are many places that only prevent freeze, if used in such a place, in the fully exposed high-temperature portion, the actual amount of heat used may not be large Date Recue/Date Received 2021-03-02 because the wall surface and the water supply inside the low-temperature portion are cooled by heat transfer with the surrounding cold air. In other words, in a place where there are not many users due to the characteristics of the wash basin with a short usage time and the surrounding space is cold, the heat transferred from the sewage is stored by the heat capacity of the wall of the heat exchanger itself and then is lost again by the outside air, resulting in very poor use of heat. It is desirable that the heat exchanger to use the heat of sewage is insulated as much as possible.
The present invention is to overcome the disadvantages of the prior art, and in particular, it can be easily applied and installed without major changes to the shape of the conventional washbasin.
Fig. 9 is a view showing an installation state of a general wash basin before implementing the heat exchanger of the present invention.
Referring to Fig. 9, the top of the washbasin 80 is standardized and installed at a height (h1) of about 760 mm from the floor of the building. There is a counter 81 outside the wash basin, a faucet 83 at the top, and a stopper 85 at the side.
There is a drain port under the wash basin 80, and a wash basin trap 90 is connected to the drain port, and the wash basin trap 90 is connected to a sewage pipe of a building through a floor drain pipe 98 or a wall drain pipe 99.
When describing the components of the washbasin trap 90 in terms of the KS
standard (KS B 1534 sanitary ware fittings), a closure 91 and a drain body 92 capable of opening and closing operation in the drain of the washbasin are tightly connected parts such as packing. The key box 95, which is a connection part that operates the stopper 91, and the tail piece 96 that is connected to the trap, and a trap 97 that blocks the inflow of odor from the sewage pipe into the interior is connected to and fastened to the drain pipe 98 or 99 connected to the building sewer pipe. A lock nut 93 and a slip nut 94 are provided between the drain body 92 and the key box 95 and are connected to each other.
Referring to the installation state of such a general washbasin, the space under the washbasin is relatively large and accessibility for maintenance is good.
Therefore, it is also very suitable as an installation place for a heat exchanger that uses the heat of sewage generated when hot water is used in the wash basin.
However, in a building where the connection of the sewage pipe is directed to the wall, the 'component height (h2)' from the end of the basin drain to the wall drain pipe 99 is limited to a very low level of 140 - 200 mm due to the construction height Date Recue/Date Received 2021-03-02 of the drain pipe (h3). It becomes impossible to lengthen the heat exchanger.
Since the heat transfer rate of the heat exchanger is governed by the area of the heat exchange area, a shorter length becomes very disadvantageous.
The present invention proposes a heat exchanger for a vertical drain pipe that can be mounted on a general wash basin without any special restrictions on material or shape, is economical with a structure that is easy to produce, and is very simple to maintain and manage such as high temperature portion cleaning.
Fig. 10 is a view showing that the heat exchanger for a vertical drain pipe according to an embodiment of the present invention is installed in a wash basin.
Referring to Fig. 10, a washbasin equipped with a heat exchanger for a vertical drain pipe of the present invention has a drain hole under the wash basin 80, and a 'wash basin drain valve 100' installed at the drain port, a 'heat exchanger 200' for a vertical drain pipe installed below the wash basin drain valve 100, and a 'trap 300' connected to the lower portion of the heat exchanger 200.
The wash basin drain valve 100 may have a structure in which the stopper is easily removed together with the support member and the opening and closing operation is alternately performed by pressing the stopper itself. A detailed description of the closure structure will be described later.
In the heat exchanger 200, a coil tube in which a metal tube having excellent thermal conductivity such as copper is rolled into a coil shape is disposed therein.
On the outside, it is wrapped with a plastic-like cover to prevent heat insulation and leakage.
The trap 300 is eccentrically in close contact with the lower portion of the heat exchanger to form an appropriate water seal height with a minimum space, and is connected to the drain pipes 98 and 99 on the wall side.
Fig. 11 is an exploded perspective view of a heat exchanger for a vertical drain pipe for a wash basin according to an embodiment of the present invention.
Referring to Fig. 11, it is a heat exchanger for a vertical drain pipe for a wash basin installed in the wash basin, and is largely divided into a wash basin drain valve 100, a heat exchanger 200, and a trap 300.
The wash basin drain valve 100 includes a stopper 110 and a drain pipe 120 coupled to the stopper 110.
The stopper 110 is composed of a stopper body part 111 having a spring therein so that the opening and closing operation is alternately performed, and a Date Recue/Date Received 2021-03-02 support 113 that is coupled into the body part 111 with a spring interposed therebetween. The supporter 113 has a locking bar 1131 inserted or discharged into the body part 111 with a spring interposed therebetween, and a circular fixing stand 1133 connected to the support leg 1132 under the locking bar 1131. The fixing stand 1133 is a circular shape and is fixedly supported in the wash basin drain pipe 120, and a groove 1134 is formed on the outer circumferential surface so that the 0-ring 1135 is coupled to perform a fixing function.
The wash basin drain pipe 120 has a top and bottom through-hole tube shape, and has a lower hook 123 (see FIG. 18) formed inside the pipe so that the fixing stand 1133 may be positioned. A threaded portion 121 is formed outside the wash basin drain pipe 120.
The heat exchanger 200 includes an upper cover 210, a front cover 220, a rear cover 230, and a lower cover 240 to form a housing by being combined with each other to be sealed from the outside.
Fig. 12 is an enlarged view showing an upper cover of a heat exchanger for a vertical drain pipe for a wash basin according to an embodiment of the present invention.
Referring to Fig. 11 and 12, the upper cover 210 has a tubular shape and has a thread 211 formed therein, so that it is screwed with the threaded portion 121 of the lower outer circumferential surface of the drain pipe 120. To the outside of the upper cover 210, a washing water conduit 213 is formed in a groove shape at the center portion. A nozzle 215 is formed under the washing water conduit 213, which is a through channel passing through the diffusion part 216 (see FIGS. 17 and 19).
0-ring grooves 212 and 214 are formed above and below the washing water conduit 213, and 0-ring 217 and 219 are fitted in the 0-ring grooves 212 and 214, so that the washing water conduit 213 is water sealed. In addition, an outer support jaw 218a protruding outward is formed on an outer upper portion of the upper cover 210.
Referring back to Fig. 11, the front cover 220 and the rear cover 230 have a semi-cylindrical shape, and are combined with each other to form a cylindrical appearance with a central hole, and the upper cover 210 and the lower cover are combined to form a housing, and a coil pipe 250 in which a metal tube such as copper having excellent conductivity is wound in a coil shape is positioned inside the housing. 0-ring type packings 251 and 252 are fitted at both ends of the coil pipe 250.
Date Recue/Date Received 2021-03-02 The outer side of the semi-cylindrical shape of the front cover 220 and the rear cover 230 are respectively formed with coupling rods 221 and 231 to screw through the screw holes 222 and 232 formed in the coupling rods 221 and 231, and at this time, the front cover 220 and the rear cover 230 are coupled to each other in a state through each of the left and right plate packings 263, 265, thereby preventing sewage from leaking to the outside.
The lower cover 240 includes an upper pipe 241 having a tubular shape and a water sealing pipe 243 extending eccentrically below the upper pipe 241. 0-ring grooves 242 and 244 are formed on the outer circumferential surface of the upper pipe 241 and the water sealing pipe 243 of the lower cover 240, respectively, so that 0-ring packings 246 and 248 are formed in each of the 0-ring grooves 242 and to prevent leakage of sewage. In addition, the upper pipe 241 of the lower cover 240 is formed with an outer support jaw 245a protruding outward.
The outer support jaws 218a and 245a on the outer circumferential surfaces of the upper cover 210 and the lower cover 240 are fixing grooves 223 and 225 inside the upper and lower ends of the front cover 220 and the rear cover 230 so that the position is constrained. 0-ring type packings 217, 219, and 246 inserted into 0-ring grooves 212, 214, and 242, which are grooves on the outer peripheral surfaces of the upper cover 210 and the lower cover 240, are in close contact with the inner peripheral surfaces of the front and rear covers 220, 230 to prevent sewage leakage.
Both ends of the coil pipe 250 accommodated in the housing are inserted into the upper and lower portions of the front cover 220 and the rear cover 230 through cylindrical through-holes 227 and 229 horizontally formed on the outer circumferential surface and protrude to the outside. 0-ring type packings 251, are located between the coil pipe 250 and the front cover 220 and the rear cover 230 to prevent leakage of sewage.
The upper cover 210, the lower cover 240, the front cover 220, and the rear cover 230 of the present invention are made of plastic because they do not participate in heat transfer, so 'O-ring type packing' as shown in the drawing may not be used, alternatively may be combined by making each part abut and welding (heat plate, ultrasonic, vibration, laser, etc.).
The trap 300 is composed of a trap body 310 and a water sealing cup 330.
The trap body 310 has two circular tubes, and the inner circular tube is Date Recue/Date Received 2021-03-02 eccentric on one side of the outer circular tube. The wastewater introduced into the inlet 311, which is an inner circular tube, passes through the water sealing cup 330, passes through the outer circular tube to the side of the inlet, and is discharged to an outlet 315 having a height similar to that of the inlet 311. A thread 312 is formed on the outer circumferential surface of the inlet 311 and is coupled with the threaded portion 331 inside the upper end of the water sealing cup 330 by the thread 312, and is tightly coupled by the 0-ring packing 314.
The water sealing pipe 243 of the lower cover 240 is inserted into the inlet of the trap body 310, and an 0-ring type packing 248 prevents leakage of sewage.
The outer upper portion of the outlet 315 is provided with an upper fixing 316, which abuts against the fixing hole 236 formed in the lower portion of the rear cover 230 and is fastened with a screw 317.
The outlet 315 of the trap body 310 is formed in the direction of the wall of the building at a position higher than the water sealing pipe 243 of the lower cover 240.
From the end of the water sealing pipe 243 to a point below the inner circumferential surface of the outlet 315, sewage is constantly collected by the water sealing cup 330 to form a height of water sealing (see FIG. 17) that prevents odor backflow in the sewage system. It is 30-50 mm. This structure increases the possibility of construction by reducing the height (h2, see FIG. 10) than using a general trap when the drain pipe of the building is on the wall.
Fig. 13 is a cross-sectional view taken along line A-A' of FIG. 10.
Referring to Fig. 13, as a cross-sectional view in the horizontal direction at the low temperature side outlet 255 of the heat exchanger 200, the sealing structure for preventing external leakage of sewage is shown in more detail.
The coil pipe 250 is in close contact with the semi-cylindrical front cover and the rear cover 230, and both ends of the low temperature side inlet 253 and the low temperature side outlet 255 come out to the outside of the front cover 220 through the cylindrical through-holes 227 and 229 (or Depending on the design change, it comes out to the outside of the rear cover 230], and the 0-ring type packings 251 and 252 are tightly closed therebetween.
The semi-cylindrical front cover 220 and the rear cover 230 are coupled with the low temperature inlet 253 and the low temperature outlet 255 out of the housing.
Left and right coupling rods 221 and 231 having a predetermined width are formed outside the surface where the front cover 220 and the rear cover 230 abut. The Date Recue/Date Received 2021-03-02 screw 261 is fastened through the screw holes 222 and 232 formed in the coupling rods 221 and 231. The front cover 220 and the rear cover 230 are coupled to each other with the left and right plate packings 263 and 265 interposed therebetween, thereby preventing sewage from leaking to the outside.
Since the front cover 220 and the rear cover 230 of the present invention do not participate in heat transfer, plastic material may be used, and thus 'plate packing' may not be used. Instead, it may be bonded by contacting the coupling rods and welding (hot plate, ultrasonic wave, vibration, laser, etc.).
Fig. 14 is a perspective view showing a sealing structure of a heat exchanger housing according to an embodiment of the present invention.
Referring to Fig. 14, the housing is made of a front cover 220, a rear cover 230, an upper cover 210, and a lower cover 240, a sewage sealing structure between them is required.
In particular, the 0-ring type packing 217, 219, 246 fitted in the outer 0-ring grooves 212, 214, 242 of the upper cover 210 and the lower cover 240 and the plate packings 263 and 265 between the surfaces where the front cover 220 and the rear cover 230 abuts cross horizontally and vertically. The sealing structure of the crossing area is important.
In general, the sealing part is a structure in which the hard member and the soft packing are in contact with each other, and the sealing packing is achieved by the resilience of the deformed soft packing. By the way, in the area where the horizontal and vertical packings of the present invention intersect, the soft packings come into contact with each other. Failure to properly manage the amount of deformation of the two-part soft packing can lead to a sudden discharge of large-flow sewage or sewage leakage due to internal pressure generated when a sewer pipe is blocked. Typically, the drainage system must have a fault-free performance at 0.1 Mpa pressure.
Fig. 15 is a cross-sectional view showing a sealing structure in a horizontal direction and a vertical direction without having a concave portion and a protruding portion.
Referring to Fig. 15, a case in which the front cover 220 and the rear cover 230 are coupled with screws using a general plate packing 86 and an 0-ring packing 87. When the plate packing 86 is compressed by the tightening of the screw 261 and stretched in the thickness direction and the 0-ring packing 87 is pushed in, a gap 88 Date Recue/Date Received 2021-03-02 may be generated and sewage water may leak.
For this reason, referring to Fig. 14 again in the present invention, the outer supporting jaws 218a and 245a are formed outside of the portions that abut the outer circumferential 0-ring grooves 212, 214 and 242 of the upper cover 210 and the lower cover 240. Inwardly, the inner supporting jaws 218b and 245b are formed to protrude further toward the outer peripheral surface. Correspondingly, the left and right plate packings 263 and 265 are formed with concave portions 2631, 2632, 2633, and 2634 to correspond to the outer support jaws 218a and 245a and the inner support jaws 218b and 245b. At the same time, protrusions 2635, 2636, 2637 are formed protruding with a width smaller than the gap between the outer supporting jaws 218a, 245a and the inner supporting jaws 218b, 245b in the direction of the 0-ring type packing 217, 219, 246. The protrusion 2635, 2636 and 2637 comes into contact with the 0-ring type packings 217, 219, and 246.
Fig. 16 is a cross-sectional view showing before and after screwing the heat exchanger housing as a part [A] of Fig. 14.
Referring to Fig. 16, the front cover 220 and the rear cover 230 show before and after the screw 261 is coupled to the screw hole 222 with the lower cover and the plate packing 263 interposed therebetween. When the front cover 220 and the rear cover 230 are assembled by tightening the screws 261, the plate packing 263 receives a certain amount of compressive force to reduce the thickness and increase the area in the thickness direction. At this time, the protrusion 2637 of the plate packing 263 in contact with the 0-ring packing 246 is deformed into a shape that fills the gap space with the peripheral part and is tightly constrained.
In this case, when pressure is applied from the inside and outside of the housing, the protrusion 2637 of the plate packing 263 is not pushed in and out, and the tight state can be maintained. If only the internal pressure is considered, the inner support jaw 245b may be omitted.
The reason for having such a structure is as described in Fig. 13. When the plate packing 86 is excessively stretched in the thickness direction during screwing, a deformation of pushing the 0-ring packing 87 occurs. Due to this, a fine gap may be caused in the sealing part where the 0-ring packing 87 and the inner circumferential surfaces of the front and rear covers 220 and 230 contact each other.
The sealing structure of the present invention is as described in Fig. 15. It is possible to achieve a safe sealing structure by providing an appropriate gap around Date Recue/Date Received 2021-03-02 the protrusion 2637 of the plate packing 263 and an appropriate difference in hardness between the plate packing 263 and the 0-ring packing 246.
Hereinafter, a heat exchange action using the heat exchanger of the present invention will be described.
Fig. 17 is a cross-sectional view illustrating a heat exchange action according to an embodiment of the present invention.
Referring to Fig. 17, the high-temperature fluid 400 discharged from the faucet is used for hand washing of the user, falls on the bottom of the stopper 110 or the washbasin 80, and rides on the inner circumferential surface of the drain pipe installed in the washbasin drain 82. It flows down, gradually spreads and flows down along the diffusion part 216 of the upper cover 210, and then flows down along the surface of the coil pipe 250. At this time, heat is dissipated by the temperature difference with the low-temperature water supply flowing inside the coil pipe 250, and heat exchange is performed. The high-temperature fluid flowing down to the lower cover 240 along the coil pipe 250 gathers again narrowly along the reduction portion 245 and flows into the water sealing pipe 243. Sewerage is accumulated in the water sealing pipe 243 by the height of the water sealing due to the difference in height from the outlet 315 of the trap 300. Accordingly, the inside of the trap 300 is full and the high-temperature fluid is discharged to the outlet 315 at a slow flow rate.
The lower support leg 1132 of the stopper 110 is connected to the fixing part 1133 while being inclined downward from the center to the outside. The slope of the support leg 1132 induces some high-temperature fluid flowing down along the structure of the stopper 110 back to the normal flow path toward the inner circumferential surface of the drain pipe 120. These irregular flows have a large difference in the amount of occurrence depending on the angle and speed of water discharge from the faucet, and the direction of contact when washing hands.
In the experiment, if a support leg structure without slope is applied, such as in general products, this irregular flow becomes drooping water, not being used for heat exchange, but immediately falling into the trap, thereby reducing the heat transfer rate by about 10%.
Looking at the heat exchange mechanism in detail with reference to the detailed heat exchange diagram [6], the high-temperature fluid flows in the form of a thin film having a free surface in contact with only the surface of the coil pipe 250 and the opposite surface in contact with air. Whenever the layer of the curved coil Date Recue/Date Received 2021-03-02 pipe 250 passes, turbulence occurs in the flow layer, thereby promoting heat exchange.
The high-temperature fluid and the low-temperature fluid flow microscopically at 90 degrees. Macroscopically, it is a flow in which the low-temperature fluid rises in a spiral from bottom to top. The present invention has the characteristic of a counter flow heat exchanger in which the flows of the high temperature fluid and the low temperature fluid are opposite to each other. The low temperature part of the heat exchanger of the present invention can be easily estimated by the formula of the heat transfer coefficient in the turbulent flow in the tube according to generalized heat transfer. However, there is no formula that can be properly applied in the high temperature part.
The thickness of the high-temperature fluid flow layer is determined by the coil diameter of the coil pipe 250, and the larger the coil diameter, the larger the surface area and the thinner flow thickness, and the smaller the coil diameter, the smaller the surface area and the thicker the flow thickness.
In terms of the flow rate of the high-temperature fluid, the thicker the flow layer, the faster the flow rate, and the thinner the flow layer, the slower the flow rate. No data were found on how the velocity of fluid flowing down the wall by gravity in the form of a thin film along the wall has a relationship with the thickness of the flow layer. However, it is estimated that the high-temperature part fluid of the present invention has a flow velocity in the range of about 0.2 to 0.4 m/s, assuming that a picture is taken by periodically flowing dye while flowing water on the surface of a long vertical coil pipe. The heat transfer coefficient can be applied as an equation of the heat transfer coefficient for the external forced flow of a circular tube, but the difference is large compared to the actual test value.
The model of the present invention is tested in the range of 2 to 5 LPM for high and low temperature fluids at the same flow rate, 30 to 65 mm in diameter of coil pipe, 140-250 mm for coil height, 25 C for high temperature fluid, 5 C
for low temperature fluid. It appeared the heat transmission rate was 1,900-2,500 W/m2K, the heat transfer rate was 1,000-2,000 W, and the heat transfer usability was 0.36-0.56. Although it is a heat exchanger composed of a simple structure as possible in a limited space, it has been confirmed to have a sufficient degree of practicality.
In order to increase the heat transfer rate at the same coil pipe winding height, Date Recue/Date Received 2021-03-02 the winding diameter of the coil pipe needs to be larger than the pipe normally used in the wash basin drainage system. This is the reason that the diffusion part 216 is present in the upper cover 210.
Fig. 18 is a cross-sectional view of a method for cleaning contaminants of high temperature part in a heat exchanger according to an embodiment of the present invention.
Referring to Fig. 18, the lower circular fixing stand 1133 of the stopper 110 has a groove 1134 formed on the outer circumferential surface thereof, and an 0-ring packing 1135 is fitted thereto. The 0-ring type packing 1135 is fitted with an elastic deformation at the lower end of the inner circumferential surface of the wash basin drain pipe 120, and the wash basin drain pipe 120 has a groove 126 and a lower hook 123 at the lower end so as to have a certain fixing force. The basin drain valve 110 of this configuration can easily pull out the stopper 110 from the basin drain pipe 120. The inside of the wash basin drain pipe 120 from which the stopper 110 is separated is in a state where the inside of the washbasin drain pipe 120 has a cross-sectional area of about 30 mm in diameter and has a vertical hole without a special structure. Therefore, if a tool such as a cleaning brush 500 is used in the state where the stopper 110 is removed from the wash basin drain pipe 120, the surface of the coil pipe 250, which is a high temperature part, can be easily cleaned.
In the model experiment of the present invention, performance degradation due to contamination of the heat exchanger in the use of about 1 month in winter was such that the heat transfer rate decreased by about 3 to 5%. Furthermore, it was confirmed that the original performance was restored when washing by the above-described method.
The contamination of the heat exchanger 200 varies greatly depending on the temperature, type and flow rate of the fluid. In the case of the wash basin, the temperature of the high-temperature fluid itself is as low as 40 C or less, and the main purpose is to wash hands and wash hair with soap or shampoo, so the occurrence of contamination is not as great as concerns. Still, if such cleaning can reduce the inconvenience of management by extending the period, it will be much more advantageous for the actual use of heat exchangers.
Fig. 19 is a cross-sectional view showing a method of washing a high-temperature part of a heat exchanger according to an embodiment of the present invention by spraying high-speed fluid, and Fig. 20 is a bottom view of an Date Recue/Date Received 2021-03-02 upper cover of the heat exchanger according to an embodiment of the present invention.
Referring to Fig. 19, a washing water conduit 213 is formed by placing a groove having a predetermined width and depth on the outer peripheral surface of the upper cover 210.
0-rings 217 and 219 are located in the upper and lower portions of the washing water conduit 213 of the upper cover 210, and the washing water drawn into the washing water conduit 213 is tightly closed to the outside by the front cover 220 and the rear cover 230. And, washing water conduit 213 communicates with the outside of the housing through the washing water inlet 233 formed on the front cover 220 or the rear cover 230.
In addition, in the washing water conduit 213, a plurality of washing water nozzles 215 for spraying washing water to the surface of the diffusion part 216 under the upper cover 210 are disposed at predetermined intervals. (See Fig. 20).
The washing water nozzle 215 is preferably formed to be inclined along the circumferential surface so as to be sprayed while rotating the surface of the diffusion part 216.
During washing, when high-pressure washing water is applied to the washing water inlet 233, the washing water having a high flow rate flows into the washing water conduit 213 of the upper cover 210. Subsequently, the washing water is sprayed from the washing water nozzle 215 to the diffusion part 216 to drop and remove contaminants on the surface of the coil pipe 250.
In addition, the washing water can be automatically washed by setting a washing operation cycle by using an electromagnetic valve and a simple electronic circuit.
(Example 1: Instantaneous water heater) Until now, the instantaneous water heater used in the washbasin had a lot of difficulty in supplying it because the power was so great that it had to perform separate electric work for the dedicated line. By applying the heat exchanger of the present invention, connecting the outlet of the low temperature side of the heat exchanger to the water inlet of the direct-water type instantaneous water heater, and connecting the outlet of the instantaneous water heater to the hot water side of the faucet, it is possible to reduce the power consumption (VV) by 40-50%. The instantaneous water heater can use an electrical outlet on the wall of an existing Date Recue/Date Received 2021-03-02 building. Therefore, it is possible to reduce the amount of power and reduce the construction cost.
(Example 2: Storage water heater) In a wash basin that uses an already installed storage-type electric water heater, it is possible to reduce the power consumption (Wh) by 30 to 40% by connecting the cold water side of the faucet to the outlet on the low temperature side of the heat exchanger and connecting the water supply to the inlet on the low temperature side. At this time, the temperature of the water heater is about enough to be used by the user in a state of mixing cold and hot water. When the temperature of the cold water rises due to the action of the heat exchanger, the flow rate of the hot water decreases and the flow rate of the cold water increases.
The flow rate of hot water use decreases, resulting in reduced power consumption.
Of course, it is also possible to apply the same method as instantaneous water heater as in Example 1.
Mode for Invention For convenience of understanding, the above-described heat exchanger for vertical drain pipe has been described limited to a sink. However, the spirit and scope of the present invention can be applied to all type heat exchangers for vertical drain pipe.
Hereinafter, a heat exchanger for a vertical drain pipe applied to a normal vertical pipe that lowers the heated wastewater will be described.
Fig. 21 is a cross-sectional view showing a heat exchanger for a vertical drain pipe according to another embodiment of the present invention, and Fig. 22 is an exploded perspective view of Fig. 21. The same reference numerals denote the same elements, and detailed descriptions are omitted.
Referring to Fig. 21 and 22, a heat exchanger for a vertical drain pipe applied to a typical vertical drain pipe includes an upper cover 610, a front cover 210, a rear cover 230, and a lower cover 640, which combined to form a housing, sealed from the outside. Their coupling relationship is the same as the heat exchanger for a vertical drain pipe applied to the above-described wash basin.
The vertical drainage pipe 600 is usually made of a plastic material such as PVC, and the vertical drainage pipe 600 is mainly used for coupling by force fitting or a coupling method through packing sealing. Accordingly, the ends of the upper cover 610 and the lower cover 640 at the portion connected to the vertical drain pipe have Date Recue/Date Received 2021-03-02 the shape of the extension pipes 611 and 641, respectively.
Fig. 23 is a cross-sectional view showing a heat exchanger for a vertical drain pipe according to another embodiment of the present invention, and Fig. 24 is an exploded perspective view of Fig. 23. The same reference numerals denote the same elements, and detailed descriptions are omitted.
Referring to Fig. 23 and 24, a heat exchanger for a vertical drain pipe applied to a typical vertical drain pipe includes an upper cover 710, a front cover 210, a rear cover 230, and a lower cover 740. They are combined with each other to form a housing and are sealed from the outside. Their coupling relationship is the same as the heat exchanger for a vertical drain pipe applied to the above-described wash basin. Their coupling relationship is the same as the heat exchanger for a vertical drain pipe applied to the above-described wash basin.
The vertical drainage pipe 700 is sometimes used as a metal tube, and the vertical drainage pipe 700 is mainly used in a screw connection method.
Accordingly, the upper cover 710 and the lower cover 740 of the portion connected to the vertical drainage pipe are provided with threaded portions 711 and 741, respectively, and the vertical drainage pipe 700 also includes threaded portions 701 and 702 corresponding thereto.
While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Industrial Applicability According to the present invention having the configuration as described above, it is possible to reduce the energy cost required to make hot water by easily recovering and utilizing heat from household sewage generated in households or small commercial buildings in daily life in winter.
Date Recue/Date Received 2021-03-02

Claims

CA 03111404 2021-03-02What is claimed is:

1. Heat exchanger for vertical drainage pipe, comprising:
an upper cover, as a tubular shape, having a diffuser inclined to the outside to the bottom surface;
a front cover and a rear cover coupled to the upper cover and having a semi-cylindrical shape, which are coupled to each other to form a cylindrical appearance with a central hole, and have a coupling rod formed at an outer end thereof;
a tubular lower cover coupled to a lower portion of the cylinder to which the front cover and the rear cover are coupled; and a coil pipe accommodated in a housing formed by combining the upper cover, the front cover, the rear cover, and the lower cover, both ends of the coil pipe accommodated in the housing are inserted into the upper and lower portions of the front cover or the rear cover with cylindrical through holes formed in a horizontal direction on each outer circumferential surface and protrude to the outside, the high-temperature fluid flows widely along the diffusion part of the upper cover, characterized in that heat exchange is performed while the high-temperature fluid flows in the form of a thin film in contact with the surface of the coil pipe and the opposite surface of fluid in contact with air.

2. The heat exchanger of claim 1, wherein an outer support jaw is protruding from the outer circumferential surface of the upper cover, an outer support jaw is protruding from the outer circumferential surface of the lower cover, characterized in that the outer support jaw on the outer circumferential surfaces of the upper cover and the lower cover are fitted into fixing grooves on the inner side of the upper and lower ends of the front cover and the rear cover, respectively, so that their positions are restricted to form a housing.

3. The heat exchanger of claim 1, wherein the upper cover, further comprising, Date Recue/Date Received 2021-03-02 a groove-shaped washing water conduit formed in the outer central portion of the upper cover;
a washing water inlet formed in the front cover or the rear cover communicating with the washing water conduit; and a plurality of nozzles penetrating from the lower portion of the washing water conduit to the diffusion part.

4. The heat exchanger of claim 1, characterized in that each of the coupling rod is coupled with the left and right plate packings interposed therebetween, the upper cover and the lower cover have an 0-ring type packing fitted into the grooves on the upper and lower ends of the upper and lower covers to prevent leakage of sewage.

5. The heat exchanger of claim 4, characterized in that the left and right plate packing has a concave portion formed to correspond to the outer supporting jaw protruding to the outside, and at the same time, a protrusion protruding in the direction of the 0-ring type packing.

6. A wash basin using a heat exchanger for a vertical drainage pipe, comprising:
washbasin;
a drain port under the wash basin;
a washbasin drain valve installed at the drain port;
a heat exchanger for vertical piping installed below the wash basin drain valve; and a trap connected to the lower portion of the heat exchanger, wherein the heat exchanger, an upper cover, as a tubular shape, having a diffuser inclined to the outside to the bottom surface;
a front cover and a rear cover coupled to the upper cover and having a semi-cylindrical shape, which are coupled to each other to form a cylindrical appearance with a central hole, and have a coupling rod formed at an outer end thereof;
a lower cover coupled to a lower portion of the cylinder to which the front cover and the rear cover are coupled, and comprising a tubular upper pipe and a water sealing pipe extending below the upper pipe;

Date Recue/Date Received 2021-03-02 a coil pipe accommodated in a housing formed by combining the upper cover, the front cover, the rear cover, and the lower cover, both ends of the coil pipe accommodated in the housing are inserted into the upper and lower portions of the front cover or the rear cover with cylindrical through holes formed in a horizontal direction on each outer circumferential surface and protrude to the outside, the high-temperature fluid flows widely along the diffusion part of the upper cover, characterized in that heat exchange is performed while the high-temperature fluid flows in the form of a thin film in contact with the surface of the coil pipe and the opposite surface of fluid in contact with air.

7. The wash basin using a heat exchanger of claim 6, wherein The wash basin drain valve is composed of a stopper and a drain pipe coupled to the stopper, characterized in that the stopper has a circular fixing stand connected to a plurality of support legs obliquely descending from the center to the outside.

8. The wash basin using a heat exchanger of claim 6, the upper cover, further comprising, a groove-shaped washing water conduit formed in the outer central portion of the upper cover;
a washing water inlet formed in the front cover or the rear cover communicating with the washing water conduit; and a plurality of nozzles penetrating from the lower portion of the washing water conduit to the diffusion part.

9. The wash basin using a heat exchanger of claim 6, characterized in that an outer support jaw is protruding from the outer circumferential surface of the upper cover, an outer support jaw is protruding from the outer circumferential surface of the lower cover, characterized in that the outer support jaw on the outer circumferential surfaces of the upper cover and the lower cover are fitted into fixing grooves on the inner side of the upper and lower ends of the front cover and the rear cover, respectively, so that their positions are restricted to form a housing.

Date Recue/Date Received 2021-03-02

10. The wash basin using a heat exchanger of claim 6, wherein the trap is composed of trap body; and a water sealing cup connected to the lower portion of the trap body, characterized in that the trap body comprises a circular inlet that is tightly coupled with an 0-ring type packing connected to the sealing pipe of the lower cover; and an outlet through which the wastewater introduced into the inlet port flows out through the water sealing cup.

11. The wash basin using a heat exchanger of claim 6, characterized in that Eeach of the coupling rod is coupled with the left and right plate packings interposed therebetween, the upper cover and the lower cover have an 0-ring type packing fitted into the grooves on the upper and lower ends of the upper and lower covers to prevent leakage of sewage.

12. The wash basin using a heat exchanger of claim 11, characterized in that the left and right plate packing has a concave portion formed to correspond to the outer supporting jaw protruding to the outside, and at the same time, a protrusion protruding in the direction of the 0-ring type packing.

Date Recue/Date Received 2021-03-02