JP7461681B1 - Water Seal Trap - Google Patents

Abstract

[Problem] To obtain a water seal trap that can be installed even in a narrow space. [Solution] A water storage section 11 of the water seal trap is disposed between a drain inlet pipe 12 and a drain outlet pipe 13. The drain inlet pipe 12 and the drain outlet pipe 13 are coaxial with their central axes oriented horizontally. The communicating pipes 14a, 14b connected to the inside of the drain inlet pipe 12 and the drain outlet pipe 13 are bent downward, respectively, and the water storage section 11 is formed by joining the tips of the communicating pipes 14a, 14b below the drain inlet pipe 12 and the drain outlet pipe 13. When the water storage section 11 cannot be made deep due to the installation space, the depth of the water storage section 11 is made shallow and the water storage section 11 is expanded horizontally to form an expanded section 16, so that the water storage section 11 can store approximately the same amount of wastewater as when the communicating pipes 14a, 14b are joined together. [Selected Figure] Figure 1

Description

The present invention relates to a water seal trap that is installed in a discharge pipe connected to, for example, a refrigerator.

Commercial freezers have an exhaust pipe that discharges the wastewater that is the melted frost that forms inside the machine to the outside. The water droplets that are generated become wastewater and flow from top to bottom inside the exhaust pipe, and are discharged into an external sewer pipe, etc.

In such exhaust pipes connected to external sewer pipes, etc., there is a risk that foul odors and warm air from the sewer pipe may backflow and enter the connected equipment due to factors such as the air pressure difference, so a water seal trap is generally installed in the exhaust pipe to prevent this. This type of drainage structure is also installed appropriately in equipment that generates wastewater, such as commercial heating and cooling equipment.

A typical water seal trap has a U-shaped or S-shaped section in the discharge pipe, which stores wastewater from above in a water storage section and drains any overflowing water downward, partially blocking the air flow through the drain pipe at the water storage section and preventing the backflow of foul odors, etc. This type of water seal trap is also often used in the drain pipes of household appliances such as kitchen sinks and wash basins.

Japanese Utility Model Application Publication No. 62-21182

However, while it is relatively easy to place a water seal trap directly below the device and drain water from top to bottom, in commercial equipment and the like, structural and installation issues may mean that the wastewater must be discharged horizontally. In this case, it is necessary to use a water seal trap with the central axes of the drainage inlet 2 to the water storage section 1 that stores the stored water W and the drainage outlet 3 from the water storage section 1 oriented horizontally, as shown in Figure 12 of Patent Document 1.

Even in this case, there needs to be enough vertical space to set up the water storage section 1 capable of storing a sufficient amount of water W, that is, enough vertical distance to accommodate the water storage section 1, the drainage inlet section 2, and the drainage outlet section 3. However, if this distance cannot be obtained, the depth dimension of the water storage section 1 must be shortened, and a sufficient amount of water W cannot be stored in the water storage section 1.

Therefore, if the air pressure difference between the drain inlet 2 and the drain outlet 3 becomes large, the water W in the water storage section 1 is pushed out, and the water storage section 1 is unable to block the backflow, resulting in a problem of malfunction of the backflow prevention function, etc.

The object of the present invention is to provide a water seal trap that can solve the above problems and provide sufficient water sealing function even when the water storage section is not deep enough.

In order to achieve the above-mentioned object, the water seal trap of the present invention is a water seal trap comprising a drain inlet pipe and a drain outlet pipe connected to a drain pipe, a pair of circular communicating pipes having one end connected to the inner ends of the drain inlet pipe and the drain outlet pipe, respectively , and a water storage section in which the other ends of the communicating pipes are bent downward and joined together at a lower portion, thereby enabling drainage to be stored, wherein the central axes of the drain inlet pipe and the drain outlet pipe are oriented horizontally and are coaxial, the upper edge of the joint between the communicating pipes in the water storage section is located lower than the lower edge of the drain outlet pipe, a cross section of the central part of the water storage section cut in a direction perpendicular to the longitudinal direction and including the upper edge has a wide flat shape, and the area of the cross section is approximately equal to or larger than the cross-sectional area of each of the cross-sectional areas of the pair of communicating pipes cut in a direction perpendicular to the longitudinal direction at one end of the pair of communicating pipes .
In order to achieve the above object, the water seal trap of the present invention is a water seal trap comprising a drain inlet pipe and a drain outlet pipe connected to a drain pipe, a pair of circular communicating pipes each having one end connected to the inner ends of the drain inlet pipe and the drain outlet pipe, respectively, and a water storage section in which the other ends of these communicating pipes are joined together below, and which can store drainage water, wherein the central axis of the open drain inlet pipe faces upward, the central axis of the open drain outlet pipe faces horizontally, the upper edge of the joint between the communicating pipes in the water storage section is located below the lower edge of the drain outlet pipe, and the central axis of the drain outlet pipe faces horizontally, A cross-section of the central part of the water storage section, cut in a direction perpendicular to the direction along the drainage inlet pipe and including the upper edge, has a wide flat shape, and the area of the cross-section is approximately equal to the cross-sectional area cut in a direction perpendicular to the direction along the central axis of the drainage inlet pipe at one end of the communicating pipe connected to the drainage inlet pipe and the cross-sectional area cut in a direction perpendicular to the direction along the central axis of the drainage outlet pipe at one end of the communicating pipe connected to the drainage outlet pipe, or is larger than the cross-sectional area of the communicating pipe connected to the drainage inlet pipe or connected to the drainage outlet pipe .

The water seal trap of the present invention expands the water storage section horizontally to ensure its capacity, providing a water seal effect that prevents foul odors and backflow of warm air without reducing the amount of water stored in the water storage section.

FIG. 2 is a perspective view of the water seal trap of the first embodiment. FIG. FIG. FIG. FIG. 2 is a side view of the water seal trap. FIG. FIG. 2 is a cross-sectional view taken along the short side direction. 3 is a cross-sectional view taken along line AA in FIG. 2. 3 is a cross-sectional view taken along line BB in FIG. 2. FIG. 11 is a vertical cross-sectional view of a modified example of the first embodiment. FIG. 11 is a vertical cross-sectional view of a water seal trap according to a second embodiment. FIG. 1 is a vertical cross-sectional view of a conventional water seal trap.

The present invention will be described in detail based on the embodiment shown in Figures 1 to 11.

Figure 1 is a perspective view of the water seal trap of the first embodiment, Figure 2 is a front view, Figure 3 is a plan view, Figure 4 is a bottom view, Figure 5 is a side view, Figure 6 is a vertical cross-sectional view, and Figure 7 is a horizontal cross-sectional view. The water seal trap is placed at the midpoint of a discharge pipe connected to, for example, a refrigerator where wastewater is generated, and has a water storage section 11 inside that stores water W to prevent backflow, etc.

The water seal trap is molded, for example, from a hard synthetic resin material, and the water storage section 11 is disposed between the drain inlet pipe 12 and the drain outlet pipe 13. The drain inlet pipe 12 and the drain outlet pipe 13 are made into tubular bodies with a circular cross section so as to be connected to the drain pipe, and each has a reduced diameter section 12', 13' attached to the inside.

The central axis H of the drainage inlet pipe 12 and the drainage outlet pipe 13 is horizontal and coaxial. One end of the circular connecting pipes 14a and 14b is connected to the reduced diameter section 12' of the drainage inlet pipe 12 and the reduced diameter section 13' of the drainage outlet pipe 13, respectively.

The other ends of these communicating pipes 14a, 14b are bent downward, and the tips of the other ends of the communicating pipes 14a, 14b are joined together in a tubular shape at a position lower than the drainage inlet pipe 12 and the drainage outlet pipe 13 to form the water storage section 11.

A wall-shaped reinforcing section 15 is formed between the outer sides of the left and right communicating pipes 14a, 14b for reinforcement. This reinforcing section 15 is formed above the joint between the communicating pipes 14a, 14b, which is the center of the water storage section 11.

Ideally, the water storage section 11 should be formed by extending the communicating pipes 14a, 14b to the position of the dashed line X shown in Figure 2. However, if the water storage section 11 cannot be formed this deep due to the installation space of the water seal trap, the water storage section 11 consisting of the communicating pipes 14a, 14b as in this embodiment 1 has a short vertical distance and an enlarged section 16 that expands horizontally, i.e., in the longitudinal and lateral directions, giving it a flattened cross-sectional shape.

That is, the cross-sectional area S of the water storage section 11 when the central portion shown in the cross-sectional view of FIG. 7 is cut vertically is approximately equal to the cross-sectional area S' shown in the cross-sectional view of FIG. 8 at one end of the communicating pipe 14a along line A-A in FIG. 2. Note that one end of the communicating pipe 14b also has a similar cross-sectional area S'.

By making the cross section of the expansion section 16 wider and flatter, the horizontal capacity of the water storage section 11 is increased even if the depth of the water storage section 11 is shallower, and the water storage section 11 stores approximately the same amount of water W as the water storage section 11 when the connecting pipes 14a and 14b shown by the dashed line X in Figure 2 are directly connected to each other. Note that if the cross-sectional area S is made larger than each cross-sectional area S', the amount of water W stored can be further increased.

In addition, if the cross-sectional area S and the cross-sectional area S' are approximately equal, the flow rate of the wastewater within the water seal trap is constant, and there is no problem with the discharge of the wastewater.

The upper edge of the water reservoir W shown in FIG. 6, i.e., the upper water level L of the water reservoir 11, is set to the lower edge Y of the joint between the ends of the communicating pipes 14a and 14b. In order to completely block air communication between the drainage inlet pipe 12 and the drainage outlet pipe 13, the upper edge Z of the joint between the communicating pipes 14a and 14b is set sufficiently lower than the lower edge Y, which is the upper limit of the water level L.

For this reason, even if the water level L drops slightly due to evaporation of the water W in the water storage section 11, the air flow between the drain inlet pipe 12 and the drain outlet pipe 13 is blocked as long as the water level L does not fall below the upper edge Z.

Furthermore, even if the above-mentioned expansion section 16 is provided in the water storage section 11, the surface area of the water W exposed to the air above the water storage section 11, which is connected to the drainage inlet pipe 12 and the drainage outlet pipe 13 via the connecting pipes 14a and 14b, at water level L is approximately equivalent to the cross-sectional area of the connecting pipes 14a and 14b, as shown in Figure 9 along line B-B in Figure 2. Therefore, the amount of evaporation of the water W is approximately the same as when the water storage section 11 is shown by the dashed line X in Figure 2, and the change in the amount of the water W due to evaporation of the water W in the water seal trap is also approximately the same.

To give an example of the dimensions of the water seal trap in Example 1, the pipe diameter of the drain inlet pipe 12 and drain outlet pipe 13 is 48 mm, the pipe diameter of the connecting pipes 14a and 14b is 38 mm, the vertical distance from the center position of the drain inlet pipe 12 and drain outlet pipe 13 to the bottom of the water storage section 11 is 58 mm, the distance from the upper edge Z of the joint between the connecting pipes 14a and 14b to the bottom of the water storage section 11 is 18 mm, the longitudinal size of the water storage section 11 is 81 mm, and the lateral size is 64 mm.

When using the water seal trap, a drain inlet pipe 12 and a drain outlet pipe 13 are connected between drain pipes arranged in a nearly horizontal direction, and wastewater is introduced from the drain pipes through the drain inlet pipe 12 into the water seal trap. A portion of the wastewater is stored in the water storage section 11 as stored water W. Any wastewater that overflows from the water storage section 11 is released into the sewer pipe through the drain outlet pipe 13, thereby functioning as a water seal trap.

Figure 10 is a vertical cross-sectional view of a modified version of Example 1, in which a tubular cleaning tube 17 extends from the enlarged portion 16 of the water storage portion 11 along the longitudinal direction of the water seal trap, and a screw cap 18 incorporating a sealing rubber ring is screwed onto the tip of the cleaning tube 17.

The cleaning pipe 17 is always sealed by a screw cap 18. If sludge or the like accumulates at the bottom of the water storage section 11 during use and causes the water seal trap to become clogged, the cleaning pipe 17 can be used to remove the deposits in the water storage section 11 without removing the water seal trap from the drain pipe.

The cleaning pipe 17 can be molded simultaneously with the water storage section 11 etc. by blow molding, and the screw cap 18 can be a ready-made part.

Figure 11 is a vertical cross-sectional view of the water seal trap of Example 2, where the same reference numerals as in Example 1 indicate the same parts.

This water seal trap can be installed in narrow places with vertical restrictions by orienting the discharge outlet pipe 13 horizontally like the water seal trap in Example 1, and still function properly, but the drain inlet pipe 12 does not necessarily have to be horizontal.

The water seal trap of Example 2 has a shape similar to that of Example 1, but the drain inlet pipe 12 opens upward. It is necessary to orient the discharge outlet pipe 13 horizontally because of its layout, but the orientation of the drain inlet pipe 12 is not limited depending on the conditions of the installation space, and it is sufficient that the drain inlet pipe 12 faces upward rather than horizontally.

Therefore, the water seal trap of Example 2 can be suitably applied when the drain pipe of a freezer or the like is arranged from top to bottom. Also, as in Example 1, it is possible to attach a cleaning pipe 17 to the water storage section 11.

REFERENCE SIGNS LIST 11 Water storage section 12 Drain inlet pipe 13 Drain outlet pipe 14a, 14b Connecting pipe 15 Reinforcement section 16 Enlarged section 17 Cleaning pipe W Water storage L Water level S, S' Cross-sectional area

Claims (3)

A drain inlet pipe and a drain outlet pipe connected to the drain pipe;
A pair of circular pipes each having one end connected to the inner end of the drain inlet pipe and the drain outlet pipe,
The other ends of the communicating pipes are bent downward and joined together at the bottom, and the water seal trap is provided with a water storage section capable of storing wastewater,
The central axes of the drain inlet pipe and the drain outlet pipe are horizontal and coaxial,
An upper edge of the joint between the communication pipes in the water storage section is located below a lower edge of the drain outlet pipe,
A cross section of the central part of the water storage section cut in a direction perpendicular to the longitudinal direction and including the upper edge has a horizontally wide flat shape,
A water seal trap characterized in that the cross-sectional area is approximately equal to or larger than each cross-sectional area of the pair of communicating pipes cut in a direction perpendicular to the longitudinal direction at one end of the pair of communicating pipes. A drain inlet pipe and a drain outlet pipe connected to the drain pipe;
A pair of circular pipes each having one end connected to the inner end of the drain inlet pipe and the drain outlet pipe,
The other ends of the communicating pipes are connected to each other at a lower portion, and the water seal trap is provided with a water storage section capable of storing wastewater,
The central axis of the drainage inlet pipe that opens faces upward, and the central axis of the drainage outlet pipe that opens faces horizontally,
An upper edge of the joint between the communicating pipes in the water storage section is located below a lower edge of the drain outlet pipe,
A cross section of the central part of the water storage section cut in a direction perpendicular to the direction along the central axis of the drain outlet pipe and including the upper edge has a horizontally wide flat shape,
A water seal trap characterized in that the cross-sectional area is approximately equal to the cross-sectional area cut in a direction perpendicular to the direction along the central axis of the drain inlet pipe at one end of the communicating pipe connected to the drain inlet pipe, and the cross-sectional area cut in a direction perpendicular to the direction along the central axis of the drain outlet pipe at one end of the communicating pipe connected to the drain outlet pipe, or is larger than the cross-sectional area of the communicating pipe connected to the drain inlet pipe or connected to the drain outlet pipe . The water seal trap according to claim 1 or 2, characterized in that the water storage section is provided with a cleaning pipe for cleaning the inside of the water storage section.

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