JP2016223695A - Piping structure for electric water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping structure for an electric water heater in which a back-flow discharge water is prevented from reaching a check valve and a branch pipe part is not required to make an inclined part, in particular.SOLUTION: A piping structure of an electric water heater comprises: an electric water heater; a discharge water pipe part for discharging discharge water of the electric water heater; a water discharging device; a discharge water pipe for discharging discharge water of the water discharging device; a joint member comprising a vertical pipe part connected by pipe on the water discharging pipe of the water discharging device, a branch pipe part installed at a side surface of the vertical pipe part in a substantial horizontal direction and connected to the water discharging pipe part, and a storing wall provided along the whole circumference of the inner surface of the vertical pipe part, of which upper end is connected at the inner surface of the vertical pipe part above an upper end of an opening of the branch pipe and of which lower end is released at a lower part than the lower end of the opening of the branch pipe part; and a check valve installed in a pipe ranging from the discharge water pipe part at the electric water heater to a location above the branch pipe part of the joint member, normally closed and opened only when the discharge water is generated from the electric water heater toward the branch pipe to allow the discharge water to pass.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pipe structure of an electric water heater for discharging waste water generated by using an electric water heater to a drain pipe of a drainage device, and more particularly, the sanitary operation of the pipe on the electric water heater side in the drain pipe. It is related with the piping structure for maintaining.

2. Description of the Related Art Conventionally, there is known an electric water heater that heats water by using electricity to make hot water and uses it for water discharge such as a wash basin or a sink. Since equipment such as a wash basin and a sink normally needs to be able to discharge hot water as soon as necessary under normal circumstances, an electric water heater provided in these devices is provided with a water storage tank inside the water storage tank. After supplying water at a natural temperature that has not been heated once, the water in the water storage tank is heated in advance until it reaches an appropriate temperature so that hot water can be discharged immediately if necessary. It is composed.
In such an electric water heater, drainage occurs for various reasons.
For example, as described above, when heated to the water supply in the water storage tank, the water temperature in the water storage tank expands due to an increase in the water temperature, and the amount of water supply in the water storage tank may exceed the allowable amount of the water storage tank. Yes, the water supply that exceeds the allowable amount needs to be discharged as waste water.
Further, if the water supply in the water supply tank is not used for a long time and left unattended, there is a possibility of breeding of germs and the like, and it cannot be said that it is very hygienic. For this reason, there is an electric water heater or the like configured to discharge all of the water supply in the water storage tank after a certain period of time and to store the water supply again.
In this way, drainage may occur from the electric water heater. However, since the faucet is a device for the user to discharge the water as needed, the water discharged by the user (the above-mentioned drainage) is not intended. It cannot be discharged from the stopper. In addition, there is always pressurization from the main side of the water supply, and it is unsanitary and other problems to reverse the water in the water storage tank to the main side. The waste water cannot be discharged to the mains of the water supply.
For this reason, in an electric water heater that generates drainage by use, a drainage pipe for treating the drainage is separately provided, and drainage is discharged from the drainage pipe to the sewage side.
The invention described in Patent Literature 1 relates to a piping structure of an electric water heater that processes the drainage of the electric water heater, and is described below, a drain trap of the electric water heater, a drain trap of the drainage device, and a drainage pipe of the drainage device. , A joint member, and a backflow prevention valve. Here, the drainage device means a device that generates drainage by use, such as a wash basin or a sink.
The drain trap of the electric water heater is provided with an inflow port through which the waste water from the electric water heater flows in at the upper end and an outflow port for discharging the waste water from the inflow port on the side surface, and the drainage pool is stored in the inside. A portion is provided, and a portion that is always full of water is formed on the drainage flow path using this reservoir portion, and this reservoir portion prevents backflow of odors and pests upstream (electric water heater side). Consists of.
The drain trap of the drainage device is a member that is attached to the drainage device tank body (sink, wash bowl, etc.) at the upper end and has a drainage port through which drainage in the tank flows, and drainage from the drainage port at the lower end. In addition, a drainage reservoir is provided in the interior, and a portion that is always full of water is formed on the drainage flow path using the reservoir, and the odor is generated by the reservoir. And is configured to prevent backflow of pests to the upstream side (indoor side).
The drainage pipe of the drainage equipment is a pipe for treating the drainage of equipment such as wash basins and sinks equipped with electric water heaters, and connects the drainage trap outlet to the upper end of the joint member described later A first tubular body that is a straight tubular body, and a second tubular body that is a linear tubular body that connects between the lower end of the joint member and a pipe on the sewage side disposed below the floor. Composed.
The drainage joint includes a vertical pipe portion that extends in the vertical direction, and a branch pipe portion that has an inclination that extends obliquely upward as it goes outward from the side surface of the vertical pipe portion.
The upper end of the vertical pipe portion is connected to the drainage outlet of the drainage trap on the drainage device side via the first pipe body, and the lower end is connected to the pipe connected to the underfloor pipe via the second pipe body.
The branch pipe part is connected to the outlet of the drain trap of the electric water heater.
The branch pipe part is configured such that a part of the branch pipe part protrudes into the vertical pipe part, and the upper end of the vertical pipe part side end of the branch pipe part is positioned below the lower end of the outer end part of the branch pipe part. Become.
The backflow prevention valve is a member that is placed at the outlet of the drain trap on the electric water heater side, is normally closed, and opens and drains only when drainage occurs from the electric water heater side to the branch pipe side. It is comprised so that passage of may be permitted.
The reason why the backflow prevention valve is employed in the piping will be described below. An electric water heater is a device on the water supply side, and if it is directly connected to a drainage pipe that discharges wastewater, if a backflow occurs from the sewage side, the water supply side pipe may be contaminated by drainage that flows back from the sewage side. There is. For this reason, by arranging a backflow prevention valve between the drainage trap of the electric potential water heater that is the water supply pipe and the joint member that is the drainage pipe, the drainage that flows back from the sewage side is prevented from flowing directly into the pipe on the water supply side. In addition, the water supply pipe is prevented from being contaminated by the waste water.

Each member comprised as mentioned above is constructed as follows.
First, the drainage trap of the drainage device is connected to the drain trap opening provided in the drainage device. In this case, the drain outlet of the drain trap of the drainage device is opened on the drainage device through the opening of the drainage device.
Next, the first tube is connected to the outlet of the drain trap of the drainage device, and the upper end of the joint member is connected to the lower end of the first tube.
Next, the lower end of the joint member and the underfloor pipe are connected via the second pipe body.
Next, the inlet of the drain trap of the electric water heater is connected to the drain pipe of the electric water heater.
Next, after arranging a backflow prevention valve at the outlet of the drain trap of the electric water heater, the branch pipe part of the joint member is connected to the outlet of the drain trap of the electric water heater, and the drainage device and the electric water heater Construction of drainage pipe is completed.

When the drainage device and the electric water heater provided with the drainage pipe configured as described above generate drainage by use, the generated drainage is discharged to the sewage side as follows.
When drainage occurs in a drainage device such as a wash basin or sink, drainage is drained from the drain opening that opens in the sink or wash bowl to the drainage trap of the drainage device, the first pipe, and the vertical pipe part of the joint member. , The second pipe body, and finally discharged from the underfloor piping to the sewage side.
In addition, when drainage occurs from the electric water heater, the drainage from the electric water heater passes through the drain trap of the electric water heater from the drain pipe, the backflow prevention valve, the branch pipe portion of the joint member, the vertical pipe portion of the joint member, It passes through in the order of the second pipe, and is finally discharged from the underfloor piping to the sewage side.

In addition, when drainage flows backward from the underfloor pipe on the sewage side, or when a large amount of drainage from the drainage equipment occurs and the drainage of the drainage to the underfloor pipe via the drain pipe cannot catch up, the branch pipe side In some cases, drainage tends to flow backward (or inflow). However, in the joint member described in Patent Document 1, the branch pipe portion is provided with an inclination that is inclined obliquely upward as it goes outward, and a part of the branch pipe portion protrudes into the vertical pipe portion, thereby The upper end of the pipe side end is configured to be positioned below the lower end of the outer end of the branch pipe. Further, a backflow prevention valve configured to be normally closed is provided on the open end side of the branch pipe (on the side connected to the outlet of the drain trap of the electric water heater).
With such a configuration, the air in the branch pipe portion cannot be vented to the drain trap side of the electric water heater by the backflow prevention valve, and remains in the branch pipe portion to form an air pocket.
This air pool prevents the drainage from entering the position of the check valve.
For this reason, the backflow drainage does not reach the water supply side piping such as the drain trap and drain pipe of the electric water heater and the water storage tank of the electric water heater. No longer touches the drainage from the drainage pipe, making it possible to use the equipment on the electric water heater side more hygienically than the backflow prevention valve.

JP 2011-158113 A

In the case of the piping structure of the electric water heater described in Patent Document 1 as described above, there are problems as described below.
In the piping structure of the electric water heater, the branch pipe part of the joint member partially protrudes into the vertical pipe part, and the upper end of the branch pipe part side end of the branch pipe part is utilized by utilizing the inclination of the branch pipe part. Is configured so as to be positioned below the lower end of the outer end portion of the branch pipe portion, so that an air pocket is generated in the branch pipe portion when backflow occurs.
Problems 1. In the joint member described in Patent Document 1, the branch pipe part is provided with an inclination such that the upper end of the vertical pipe part side of the branch pipe part is positioned below the lower end of the outer end part of the branch pipe part. , Configured to form an air pocket. As described above, the branch pipe portion needs to have a height difference sufficient to form a necessary air reservoir, so that the branch pipe portion needs a certain height and width. In addition, when the required height is formed by inclination, the lateral width of the branch pipe portion needs to be increased in proportion to the height width of the branch pipe portion. In the case of using the joint member described in Patent Document 1, it is necessary to perform design and connection adjustment in consideration of the influence on the height and width. That is, there is a problem in that the degree of freedom in design is lost by providing the branch pipe portion with an inclination.
Problem 2. When the joint member is industrially produced from a resin material, a molding method called a blow molding method or an injection molding method is used. Among these, in the blow molding method, it is possible to mold only the shape that simply provides the thickness to the external shape, and it is not possible to provide irregularities that are not in the external shape inside the molded product, Like the joint member of the cited document 1, a molded product having a configuration in which a part of the branch pipe part of the joint member protrudes into the vertical pipe part cannot be formed. In addition, after molding, a post-processing work called deburring is also required, and the cost for post-processing increases, which is disadvantageous in terms of cost compared to the injection molding method.
The injection molding method prepares molds for each of the outer shape and the inner shape, combines them, presses the molten resin into the gap between the two molds, pours it in, and removes the mold after cooling to mold the resin In the method of manufacturing the product, it is possible to provide the inner shape and the outer shape with high accuracy, and to provide the inside of the molded product with irregularities that are not in the external shape. However, in the invention described in Patent Document 1, it is not impossible to adopt this injection molding method, but it is difficult.
To explain, the branch pipe part itself needs to have a slope to form an air pocket, but the outer end part of the branch pipe part is connected to other pipes such as the outlet of the drain trap of the electric water heater. Therefore, it is necessary to open in the horizontal direction. In this way, the branch pipe part itself faces in an oblique direction, whereas the opening at the end part faces in the horizontal direction, and the direction of the opening at the end part does not match the direction of the branch pipe part. In this mold movement, the mold for molding the inside of the branch pipe part during molding cannot be taken out from the opening at the outer end of the branch pipe part. In addition, a mold for forming the inner surface of the vertical pipe part is arranged near the opening provided in the vertical pipe part of the branch pipe part, and the structure is complicated, so the opening provided in the vertical pipe part of the branch pipe part It is difficult to take out the mold for molding the inside of the branch pipe part.
Actually, the opening of the outer end of the branch pipe part is achieved by adopting a mold with a special operation and structure, which is different from a simple operation that at least the mold reciprocates linearly. It is possible to take out the mold that molds the inside of the branch pipe part from the mold, but it is not impossible to make the outer end of the branch pipe part substantially horizontal, but the mold with special operation and structure However, the operation of the mold at the time of molding becomes complicated, the cost of the mold itself is increased, the failure is likely to occur, and the time required for molding increases.
The present invention has been invented in view of the above problems, and in the piping structure of an electric water heater, even when a backflow occurs, an air pool is generated in the branch pipe part, and the pipe is arranged on the side of the branch pipe part. While preventing the backflow from reaching the backflow prevention valve, the branch pipes do not need to be particularly inclined, ensuring the freedom of design of joint members, etc. The present invention proposes a piping structure for an electric water heater using a joint member that can be easily formed even by injection molding that is not employed.

The present invention according to claim 1 is a pipe structure of an electric water heater for discharging drainage from an electric water heater to a drain pipe to a drainage device,
An electric water heater, a drain pipe for discharging the drain of the electric water heater, a drain device, a drain pipe for draining the drain of the drain device, and a vertical pipe connected to the drain pipe of the drain device, Provided in a substantially horizontal direction on the side surface of the vertical pipe part and provided along the entire inner surface of the branch pipe part connected to the drain pipe part, the upper end is higher than the upper end of the opening of the branch pipe part A joint member consisting of a storage wall, which is connected to the inner surface of the vertical pipe portion at the upper part and whose lower end is opened below the lower end of the opening of the branch pipe part, and a drain pipe part on the electric water heater side. A backflow prevention valve provided in the pipe up to the branch pipe portion of the member, which is normally closed and opens only when drainage from the electric water heater side to the branch pipe side occurs and allows passage of drainage; It is the piping structure of the electric water heater which consists of.

  According to a second aspect of the present invention, in the paragraph 0018, a drain trap is provided between a drain pipe portion for discharging the drain of the electric water heater and a branch pipe portion of the drain joint. It is the piping structure of an electric water heater.

  According to a third aspect of the present invention, the storage wall protrudes toward the center of the vertical pipe portion at a position below the connection portion with the vertical pipe portion, and is between the storage wall and the opening of the branch pipe portion. The piping structure of the electric water heater according to paragraph 0008 or paragraph 0009, wherein a gap space is formed in the electric water heater.

  According to the fourth aspect of the present invention, the storage wall has substantially the same shape in plan view from the connection portion with the vertical tube portion to the lower end, and is lower than the connection portion of the vertical tube portion with the storage wall. The pipe of the electric water heater according to paragraph 0008 or paragraph 0009, characterized in that the vertical pipe portion protrudes outward at the position and a gap space is formed between the storage wall and the opening of the branch pipe portion. Structure.

  According to a fifth aspect of the present invention, in any one of the paragraphs 0008 to 0011, the storage wall is configured separately from the other portion including the vertical pipe portion and the branch pipe portion of the joint member. It is the piping structure of the electric water heater as described in any one.

In this invention of Claim 1, by forming the storage wall for storing air in the inside of a coupling member, from the upper end (connection part with a vertical pipe part) of a storage wall to a lower end at the time of generation | occurrence | production of a backflow The air pool is generated in the gap space between the branch pipe part and the inner side surface of the vertical pipe part and the storage wall. Because of this air pool, the backflowed drainage does not reach the backflow prevention valve provided in the branch pipe section, etc., so that the device on the electric water heater side can touch the drainage rather than the backflow prevention valve and the backflow prevention valve. It disappeared and it became possible to use it very hygienically.
Further, in the present invention, it is no longer necessary to provide an inclination for forming an air pocket in the branch pipe portion of the joint member. Further, it is not necessary to adopt a complicated mechanism such as a rotating mold structure for molding the storage wall portion. For this reason, unlike a conventional drainage joint, a joint member or the like can be easily formed even by injection molding that ensures a degree of freedom in design and does not employ particularly high technology.
In this invention of Claim 2 thru | or 4, the specific structure was able to be clarified about the piping structure of an electric water heater.
In the present invention according to claim 5, a joint member / formation that forms an air pocket according to the implementation of the present invention by selecting whether or not to use a storage wall as necessary for the piping structure of the electric water heater. It is now possible to select joint members that do not.

It is a reference figure which shows the construction state of the Example of this invention. It is sectional drawing which shows the construction state of the main member of the Example of this invention. It is sectional drawing which shows the construction state of a coupling member periphery of the Example of this invention. It is sectional drawing which shows the state in which the backflow generate | occur | produced of the Example of FIG. It is sectional drawing which shows the molding state by the metal mold | die of the coupling member of this invention. It is sectional drawing which shows the molding state by the metal mold | die of the coupling member of this invention. It is sectional drawing which shows the construction state of a coupling member periphery of another Example. It is sectional drawing which shows the Example which used the storage wall as another member from the other structure of a coupling member.

Below, the 1st example of the present invention is described, referring to drawings.
The piping structure provided with the backflow prevention valve 2 of the first embodiment of the present invention shown in FIGS. 1 to 4 relates to the piping structure of the electric water heater D for treating the drainage of the electric water heater D. The drainage trap 3 of the electric water heater, the drainage trap 6 of the drainage device, the drainage pipe of the drainage device, the joint member 1, and the backflow prevention valve 2 are described. Here, the drainage device is a device that generates drainage by use, such as a washstand or a sink. In this embodiment, the sink N described below is adopted as the drainage device.
The sink N includes a sink S as a tank body provided with an opening for attaching a drain trap 6 of a drainage device to be described later on the bottom surface, a top plate portion K provided in the horizontal direction from the upper edge of the sink S, and the top plate And a cabinet part C disposed below the part K.
Further, in the cabinet part C, an electric water heater D is disposed which heats the water supply by electricity to make it hot water and uses it for water discharge such as a wash basin or a sink N. The electric water heater D discharges a part of the water supply from a drain pipe D1 provided as drainage when used by the configuration and operation described in paragraph 0002.
The drainage trap 3 of the electric water heater is composed of a casing body 4 having a substantially cylindrical shape described below, and a deodorizing cylinder 5 disposed inside the casing body 4.
The casing body 4 has a drain pipe part D1 of the electric water heater D connected to the upper end, an inlet 4a into which waste water from the electric water heater D flows, and a flow for discharging the waste water from the inlet 4a to the side surface. And an outlet 4b.
The deodorizing cylinder 5 is a member having a substantially funnel shape provided inside the casing body 4, and an upper end thereof is watertightly connected to an inner surface above the outflow port 4 b of the casing body 4, and a lower end is substantially the same. It has a cylindrical shape and extends downward from the lower end of the outlet 4b.
When drainage flows from the inflow port 4 a, the drainage flows from the inflow port 4 a between the inside of the casing body 4, the inside of the deodorizing cylinder 5, the lower end of the deodorizing cylinder 5, and between the outer surface of the deodorizing cylinder 5 and the casing body 4. It passes in order, and is finally discharged | emitted from the outflow port 4b. At this time, drainage is stored in the casing body 4 from the bottom surface of the casing body 4 to the lower end position of the outlet 4b. Due to the stored drainage, a portion that is always full of water is formed in the flow path portion from the inside of the deodorizing cylinder 5 to the outer surface of the deodorizing cylinder 5 and the casing body 4. Even if odors and pests flow backward from the drain pipe side to the electric water heater D side, the full water portion can prevent further intrusion to the electric water heater D side.
Such a function to prevent odors and pests from entering the upstream side is called a “trap function”. Further, the drainage within the trap body 7 for filling the drainage channel with water is referred to as “sealed water”. That is, the drain trap 3 of the electric water heater is a sealed drain trap.
The drainage trap 6 of the drainage device is a drainage trap attached to a sink N that is a drainage device, and includes a trap body 7 and a bowl-like member 8 described below.
The trap body 7 has a substantially cylindrical shape with a bottom, and includes a drain port 7a on the upper side and a discharge port 7b on the bottom surface, and further communicates with the discharge port 7b. It is equipped with.
The bowl-shaped member 8 is a member having a substantially bowl-like shape with a bottomed cylinder, and is disposed so as to cover the cylinder portion 7 c of the trap body 7. Moreover, the lower end of the bowl-shaped member 8 is arrange | positioned below the upper end of the cylinder part 7c at the time of completion of construction.
In the drain trap 6 of the drainage device as described above, when drainage flows from the drain port 7a when the construction is completed, the drainage is between the trap port 7 inner surface and the bowl-shaped member 8 outer surface from the drain port 7a. 7 passes between the bottom surface of the flange 7 and the lower end of the flange-shaped member 8, and between the inner surface of the flange-shaped member 8 and the outer surface of the cylindrical portion 7 c, flows into the cylindrical portion 7 c from the upper end of the cylindrical portion 7 c, and from the discharge port 7 b. Discharged. At this time, drainage as sealed water is stored in the trap body 7 and between the upper end of the cylindrical portion 7 c and the bottom surface of the trap body 7.
This sealed water forms a part that is always full on the flow path in the drain trap, and can prevent odors and pests from entering the upstream side (drain port 7a side) of the sealed part. That is, the drainage trap 6 of the drainage device is a sealed drainage trap, similar to the drainage trap 3 of the electric water heater, although the configuration is different.
The drainage pipe of the drainage equipment is a pipe for treating drainage of drainage equipment such as a wash basin and a sink N, and in this embodiment, a joint member 1 described later from an outlet 7b of the drainage trap 6 of the drainage equipment. A straight line connecting the first pipe P1 which is a straight pipe connecting the upper end of the pipe, the joint member 1, and the pipe from the lower end of the joint member 1 to the sewage-side pipe disposed under the floor. And a second tubular body P2 that is a tubular body.
The joint member 1 includes a vertical tube portion 1a having a substantially cylindrical shape disposed in the vertical direction, and a branch pipe portion 1b having a substantially cylindrical shape in a substantially horizontal direction from the side surface of the vertical tube portion 1a. Consists of.
The “substantially horizontal direction” of the above-mentioned branch pipe portion 1b is not less than a horizontal direction without a gradient, and more than 0 degree and about 3 degrees or less with respect to a horizontal plane for die removal or natural drainage. Including a gentle slope. Since the length in the horizontal direction of the branch pipe portion 1b is usually 100 millimeters or less, an air reservoir A due to the gradient of the branch pipe portion 1b as described in the cited document 1 is obtained at a gentle slope of about 3 degrees or less. Almost no generation occurs, and the operation of the mold in the injection molding method and connection with other pipes can be performed in the same manner as the horizontal pipes without gradients.
Further, in this embodiment, the upper end of the vertical pipe portion 1a is located above the upper end of the opening of the branch pipe portion 1b provided in the vertical pipe portion 1a along the entire inner surface of the vertical pipe portion 1a. Connected to the side surface, the lower end includes a storage wall 1c that opens below the lower end of the opening of the branch pipe portion 1b provided in the vertical pipe portion 1a and stores air when the drainage flows backward.
The storage wall 1c will be described in detail. The storage wall 1c is provided with an inclined portion facing downward from the connecting portion with the vertical tube portion 1a toward the center side of the vertical tube portion 1a. It is configured to be bent. The storage wall 1c protrudes toward the center side of the vertical pipe portion 1b by this inclined portion, so that the openings on the inner side surfaces of the vertical pipe portion 1a of the storage wall 1c and the branch pipe portion 1b, the inside of the storage wall 1c and the vertical pipe portion 1a A gap space 1d is formed between the side surfaces.
Further, the joint member 1 in this embodiment is formed by injection molding so that the vertical pipe portion 1a, the branch pipe portion 1b, and the storage wall 1c become an integral member.
More specifically, the mold M1 that forms the outer surface of the joint member easily uses the injection molding method by setting a plane including the central axis of the vertical pipe portion 1a and the central axis of the branch pipe portion 1b as a divided surface. it can.
Of the molds that form the inner part of the joint member 1, the mold M2 that forms the internal shape of the vertical pipe part has an opening above or below the vertical pipe part 1a from the state shown in FIG. Therefore, by performing a simple linear operation, it can be taken out as shown in FIG.
Of the molds forming the inner part of the joint member 1, the mold M3 forming the internal shape of the branch pipe part is a simple straight line from the state shown in FIG. 5 through the opening outside the branch pipe part 1b. By performing the target operation, it can be taken out as shown in FIG.
As described above, unlike the joint member 1 of the cited document 1, it is no longer necessary to take out the inner mold of the branch pipe portion 1b by a complicated or special structure / operation. The cost of the machine itself is low, it is difficult for malfunctions to occur, and the time required for molding can be shortened.
The backflow prevention valve 2 is a member disposed at the outlet 4b of the drain trap on the electric water heater D side, and is normally closed, and drainage from the electric water heater D side to the branch pipe portion 1b side occurs. It is configured to only open and allow the passage of drainage.
The reason why the backflow prevention valve 2 is used for the piping is the same as that used in the piping structure of the conventional electric water heater D described in paragraph 0002.

Each member comprised as mentioned above is constructed as follows. Although not specifically described in detail, the connecting portions of the respective members are connected in a watertight manner by a fitting connection using packing or a bonding method, if necessary.
First, the drain trap 6 of the drain device is connected to the opening of the sink S bottom of the sink N, which is a drain device, and the drain port 7a of the drain trap 6 of the drain device is opened to the bottom of the sink S of the sink N.
Next, the first pipe P1 is connected to the discharge port 7b of the drain trap 6 of the drainage device, and the upper end of the joint member 1 is connected to the lower end of the first pipe P1.
Next, the lower end of the joint member 1 and the underfloor piping are connected via the second tubular body P2.
Next, the inlet 4a of the drain trap 3 of the electric water heater is connected to the drain trap 3 of the electric water heater.
Next, after arranging the backflow prevention valve 2 at the outlet 4b of the drain trap 3 of the electric water heater, the branch pipe portion 1b of the joint member 1 is connected to the outlet 4b of the drain trap 3 of the electric water heater. Thereby, the drain pipe part D1 of the electric water heater D is connected to the branch pipe part 1b of the joint member 1 through the drain trap 3 of the electric water heater.
Furthermore, the trapezoidal member 8 is disposed inside the trap body 7 of the drainage trap 6 of the drainage device, and the construction of the drainage device and the drainage pipe of the electric water heater D is completed.

When the drainage device and the electric water heater D provided with the drainage pipe configured as described above generate drainage by use, the generated drainage is discharged to the sewage side as follows.
When drainage is generated in the sink N, which is a drainage device, drainage is performed from the drainage port 7a provided on the bottom surface of the sink S, the drainage trap 6 of the drainage device, the first tubular body P1, and the vertical pipe of the joint member 1 It passes through the part 1a and the second tubular body P2 in this order, and is finally discharged from the underfloor piping to the sewage side.
Further, when drainage occurs from the electric water heater D, the drainage from the electric water heater D passes through the drain trap 3 of the electric water heater from the drain pipe portion D1 to the longitudinal portion of the branch pipe portion 1b of the joint member 1 and the joint member 1. It passes through the pipe portion 1a and the second pipe body P2 in this order, and is finally discharged from the underfloor piping to the sewage side.

In addition, when drainage flows backward from the underfloor pipe on the sewage side, or when a large amount of drainage occurs from the sink N, which is a drainage device, and the drainage of the drainage to the underfloor pipe via the drainage pipe does not catch up, There is a case where drainage tends to flow backward (or inflow) toward the branch pipe portion 1b.
However, in the joint member 1 of the present embodiment, the upper end of the joint member 1 is on the inner surface of the vertical pipe portion 1a above the upper end of the opening of the branch pipe portion 1b provided in the vertical pipe portion 1a. The lower end is provided with a storage wall 1c opened below the lower end of the opening of the branch pipe part 1b provided in the vertical pipe part 1a, and further, the drain trap 3 of the electric water heater of the branch pipe part 1b. The outflow port 4b is provided with a backflow prevention valve 2 configured to be normally closed.
With this configuration, as shown in FIG. 4, the air in the branch pipe portion 1 b and the air between the outer side surface of the storage wall 1 c and the inner side surface of the vertical pipe portion 1 a are caused by the backflow prevention valve 2. It cannot be ventilated to the drain trap 3 side of the electric water heater, and continues to stay between the outer side surface of the branch pipe portion 1b and the storage wall 1c and the inner side surface of the vertical pipe portion 1a, thereby forming an air pocket A.
Due to the air reservoir A, the water surface W of the backflow water does not rise from the vicinity of the lower end of the storage wall 1c, and the backflowed wastewater does not enter the position of the backflow prevention valve 2.
For this reason, the drained water flowing back does not reach the water supply side piping such as the drain trap 3 of the electric water heater, the drain pipe portion D1, and the water storage tank of the electric water heater D. The backflow prevention valve 2 does not come into contact with the drainage from the drainage pipe due to air accumulation, and the device on the electric water heater D side than the backflow prevention valve 2 can be used in a very sanitary manner.

The embodiments of the present invention are as described above. However, the present invention is not limited to the above-described embodiments, and can be freely changed without departing from the scope of the present invention.
For example, in the above embodiment, the sink N is used as the drainage device, but the present invention is not limited to the above embodiment, and can be used for any drainage device as needed, such as a washstand. I do not care.

  Moreover, in the joint member 1 of the said Example, the said storage wall 1c is equipped with the inclination part so that it may face the downward direction toward the center side of the vertical pipe part 1a in the position below a connection location with the vertical pipe part 1a. The gaps 1d are formed between the storage wall 1c and the opening of the branch pipe part 1b and the inner side surface of the vertical pipe part 1a by this inclined part. However, the present invention is limited to the above embodiment. However, as in the embodiment of the joint member 1 shown in FIG. 7, the shape (opening diameter) is substantially the same in plan view from the connecting portion to the lower end of the vertical tube portion 1a. The vertical pipe portion 1a protrudes outward at a position below the connection location with the storage wall 1c, and a gap space 1d is formed between the storage wall 1c and the opening of the branch pipe portion 1b or the inner side surface of the vertical pipe portion 1a. You may comprise so that it may form. The storage wall 1c of the joint member 1 of the embodiment of FIG. 3 is provided between the storage wall 1c and the opening of the branch pipe part 1b or the vertical pipe part 1a by providing an inclined portion toward the center side of the vertical pipe part 1a. In contrast to the formation of the gap space 1d, the inner diameter of the storage wall 1c of the joint member 1 of the embodiment of FIG. 7 is substantially the same as the inner diameter of the upper end portion designed in accordance with the inner diameter of the first tubular body P1 to be connected. The vertical pipe portion 1a that reaches the lower end with the same height and projects in the outward direction from the portion of the vertical pipe portion 1a that is at the same height as the storage wall 1c, and the opening of the storage wall 1c and the branch pipe portion 1b A space in which an air pocket A is generated by forming a gap space 1d therebetween is prepared. By comprising in this way, the opening area of the flow path of the waste_water | drain side can be ensured widely.

  Moreover, in the joint member 1 of the said Example, although the storage wall 1c is shape | molded integrally with the vertical pipe part 1a and the branch pipe part 1b of the joint member 1, this invention is not limited to the said Example. Instead, as in the embodiment of the joint member 1 shown in FIG. 8, the storage wall 1c may be configured as a separate member with respect to the joint member 1 composed of the vertical pipe portion 1a and the branch pipe portion 1b. In the embodiment of the joint member 1 shown in FIG. 8, the first pipe P1 lower end fixed to the joint member 1 by the nut member and the step in the vertical pipe portion 1a are stored as separate members. The wall 1c is clamped and detachably fixed inside the joint member 1. With such a configuration, it is possible to select whether or not the storage wall 1c is used / not used as necessary, and the joint member 1 that forms the air reservoir A according to the implementation of the present invention 1 / the joint member 1 that does not form the storage member 1c. Now available for selection.

DESCRIPTION OF SYMBOLS 1 Joint member 1a Longitudinal pipe part 1b Branch pipe part 1c Reservoir wall 1d Clearance space 2 Backflow prevention valve 3 Drain trap of electric water heater 4 Casing body 4a Inlet 4b Outlet 5 Deodorant cylinder 6 Drainage trap 7 of drainage equipment 7 Trap body 7a Drainage port 7b Drainage port 7c Cylindrical part 8 Saddle-shaped member A Air reservoir C Cabinet part D Electric water heater D1 Drainage pipe part K Top plate part P1 First pipe body P2 Second pipe body M1 Forms the outer surface of the joint member Mold M2 Mold that forms the internal shape of the vertical pipe part M3 Mold that forms the internal shape of the branch pipe part N Sink S Sink W Water surface of the backflow water

Claims (5)

It is a piping structure of an electric water heater for discharging waste water from an electric water heater to a drain pipe for drainage equipment,
An electric water heater,
A drain pipe section for discharging the drainage of the electric water heater,
Drainage equipment,
Drainage pipes for draining drainage equipment,
A vertical pipe connected to the drainage pipe of the drainage device;
A branch pipe part provided in a substantially horizontal direction on a side surface of the vertical pipe part and connected to the drain pipe part,
Provided along the entire circumference of the inner surface of the vertical pipe part, the upper end is connected to the inner side surface of the vertical pipe part above the upper end of the opening of the branch pipe part, and the lower end is connected to the lower end of the opening of the branch pipe part A storage wall that is also open below
A joint member comprising:
Equipped in the pipe from the drain pipe part on the electric water heater side to the branch pipe part of the joint member, it is normally closed and only opens and drains when drainage from the electric water heater side to the branch pipe side occurs. A backflow prevention valve that allows the passage of
An electric water heater piping structure consisting of   The piping structure of the electric water heater according to claim 1, further comprising a drain trap between a drain pipe portion for discharging the drain of the electric water heater and a branch pipe portion of the drain joint.   The storage wall protrudes toward the center side of the vertical pipe portion at a position lower than the connection portion with the vertical pipe portion, and a gap space is formed between the storage wall and the opening of the branch pipe portion. The piping structure of the electric water heater according to claim 1 or 2. The storage wall has substantially the same shape in plan view, from the connection portion with the vertical pipe portion to the lower end,
The vertical tube portion protrudes outwardly at a position below the connecting portion with the storage wall of the vertical tube portion, and a gap space is formed between the storage wall and the opening of the branch pipe portion. The piping structure of the electric water heater according to claim 1 or 2.   The electric hot water according to any one of claims 1 to 4, wherein the storage wall is configured separately from other parts including the vertical pipe portion and the branch pipe portion of the joint member. Piping structure.

Images