Pipe connection tube

Abstract

The present specification relates to a pipe connection tube and, more specifically, to a pipe connection tube including an air drain. According to an embodiment, the pipe connection tube may comprise: an upper body; and a lower body coupled to the upper body. According to an embodiment, the upper body may comprise: an upper connection unit connected to a first pipe or a first pipe connection tube; an inner pipe unit extending from one end of the upper connection unit; and an upper housing formed on an outer circumferential surface of the upper body. According to an embodiment, the lower body may comprise: a lower connection unit connected to a second pipe or a second pipe connection tube; and a lower housing formed on an outer circumferential surface of the lower body and coupled to the upper housing to form an air drain.

Description

pipe fittings

[0001] This specification relates to a pipe fitting, and more particularly to a pipe fitting including an air drain.

[0002]

[0003] Pipes used to discharge sewage or wastewater are connected vertically and horizontally by pipe joints. To ensure the smooth discharge of sewage or wastewater through the pipes, air must be introduced into the pipes during the drainage process. However, if any element in the drainage pipe obstructs the inflow of outside air, not only will the drainage function of the pipe be impaired, but the function of the surrounding drainage pipes may also be impaired.

[0004] For example, when sewage or wastewater is discharged through a vertical pipe placed vertically in a drainage system, if the air inside the pipe decreases and negative pressure is generated, the sealing water inside the trap connected to the horizontal pipe connected to the vertical pipe may be sucked through the horizontal pipe toward the vertical pipe. This may cause the trap's function to deteriorate.

[0005]

[0006] The purpose of this specification is to provide a pipe joint that can relieve negative pressure inside a pipe by introducing air into the pipe when sewage or wastewater is discharged through the pipe.

[0007] The purpose of this specification is not limited to the aforementioned purposes, and other purposes and advantages of this specification not mentioned herein will be more clearly understood by the embodiments of this specification described below. Furthermore, the purposes and advantages of this specification can be realized by the components and combinations thereof described in the claims.

[0008]

[0009] A pipe fitting according to one embodiment may include an upper body and a lower body coupled to the upper body.

[0010] In one embodiment, the upper body may include an upper connecting portion connected to the first pipe or the first pipe fitting, an inner tube extending from one end of the upper connecting portion, and an upper housing formed on an outer circumferential surface of the upper body.

[0011] In one embodiment, the lower body may include a lower connecting portion connected to a second pipe or a second pipe fitting and a lower housing formed on an outer surface of the lower body and coupled with the upper housing to form an air drain.

[0012] In one embodiment, a plurality of ventilation holes may be formed in the lower surface of the lower housing.

[0013] The pipe joint according to one embodiment may further include an air sheet arranged to cover the ventilation hole.

[0014] In one embodiment, when the upper housing and the lower housing are coupled, the inner tube may be positioned inside the lower connecting portion.

[0015] In one embodiment, the diameter of the inner tube may decrease toward the bottom.

[0016] In one embodiment, a plurality of upper supports extending downward may be formed inside the upper housing.

[0017] In one embodiment, the air sheet may be ring-shaped.

[0018] In one embodiment, the inner surface of the air sheet may be supported by the outer surface of the upper support.

[0019] In one embodiment, the lower body may further include an inner wall extending from one end of the lower connecting portion.

[0020] In one embodiment, a plurality of upper supports extending downward may be formed inside the upper housing.

[0021] In one embodiment, the inner wall may be disposed between the inner tube and the upper support.

[0022] In one embodiment, when negative pressure is generated inside the pipe joint, air may be introduced into the pipe joint through the ventilation hole as the air sheet moves upward.

[0023] In one embodiment, air introduced through the vent hole can be introduced into the pipe joint through the space between the inner tube portion and the lower connecting portion.

[0024]

[0025] The pipe joint according to the embodiments has the advantage of being able to relieve negative pressure inside the pipe by introducing air into the pipe when sewage or wastewater is discharged through the pipe.

[0026]

[0027] Figure 1 is a perspective view of a pipe joint according to one embodiment.

[0028] Figure 2 is an exploded perspective view of a pipe joint according to one embodiment.

[0029] FIG. 3 is a perspective view of an upper body included in a pipe fitting according to one embodiment.

[0030] FIG. 4 is a perspective view of a lower body included in a pipe fitting according to one embodiment.

[0031] Figures 5 and 6 are cross-sectional views of a pipe joint according to one embodiment.

[0032] Figures 7 to 10 illustrate other embodiments in which the method of joining the upper body and the lower body of the pipe joint is modified.

[0033] Fig. 11 is a perspective view of a pipe joint according to another embodiment.

[0034] Fig. 12 is a longitudinal cross-sectional view of a pipe joint according to another embodiment.

[0035] FIG. 13 is a drawing showing the lower surface of an upper housing included in a pipe fitting according to another embodiment.

[0036] Figures 14 to 16 illustrate further embodiments in which the shape of the air drain of the pipe joint is modified.

[0037] Figure 17 illustrates another embodiment in which the upper connecting portion of the upper body of the pipe fitting is deformed.

[0038] Figure 18 illustrates another embodiment in which the upper connecting portion of the upper body of the pipe joint is deformed.

[0039]

[0040] The above-described objects, features, and advantages are described in detail below with reference to the attached drawings, so that those skilled in the art to which the present disclosure pertains can easily practice the embodiments of the present disclosure. In describing the present disclosure, if a detailed description of a known technology related to the present disclosure is determined to unnecessarily obscure the gist of the present disclosure, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals indicate the same or similar components.

[0041] FIG. 1 is a perspective view of a pipe fitting according to one embodiment, and FIG. 2 is an exploded perspective view of the pipe fitting according to one embodiment. FIG. 3 is a perspective view of an upper body included in a pipe fitting according to one embodiment, and FIG. 4 is a perspective view of a lower body included in a pipe fitting according to one embodiment. FIG. 5 and FIG. 6 are longitudinal cross-sectional views of a pipe fitting according to one embodiment.

[0042] Referring to FIGS. 1 to 6, a pipe fitting (1) according to one embodiment may include an upper body (10) and a lower body (20). The upper body (10) and the lower body (20) may be coupled to or separated from each other.

[0043] The upper body (10) may include an upper connecting portion (101), an inner tube portion (102), and an upper housing (103).

[0044] The upper connecting portion (101) can be connected to a first pipe or a first pipe fitting. FIGS. 1 to 6 illustrate an embodiment in which a screw thread is formed on the other end of the upper connecting portion (101) so that the upper connecting portion (101) is connected to the first pipe.

[0045] In one embodiment, the screw threads formed on the other end of the upper connecting portion (101) can be engaged with the screw threads formed on the inner surface of the first fixing cap (301). A first elastic member (302) can be inserted into the other end of the upper connecting portion (101). With the first elastic member (302) inserted and the first fixing cap (301) hanging over the other end of the upper connecting portion (101), the first pipe can be inserted into the upper connecting portion (101) through the other end of the upper connecting portion (101). With the first pipe inserted into the upper connecting portion (101), the first pipe can be connected to the upper connecting portion (101) by rotating the first fixing cap (301) in a locking direction. It should be noted that this coupling structure and coupling method are merely one example, and the upper connecting portion (101) can be connected to the first pipe through other coupling structures and coupling methods. Depending on the embodiment, the first elastic member (302) may not be included in the pipe joint (1).

[0046] In another embodiment, the upper connecting portion (101) may be formed in the form of a pipe without threads. If the upper connecting portion (101) is formed in the form of a pipe, the upper connecting portion (101) may be connected to the first pipe joint.

[0047] In one embodiment, a first step portion (101a) may be formed inside the upper connecting portion (101). The first step portion (101a) may support a first pipe inserted into the upper connecting portion (101). However, if the upper connecting portion (101) is formed in the shape of a pipe, the first step portion (101a) may be omitted.

[0048] The inner pipe (102) can extend from one end of the upper connection (101). Accordingly, wastewater or sewage flowing into the upper connection (101) through the first pipe or the first pipe joint can flow into the inner pipe (102).

[0049] In one embodiment, the diameter of the inner tube (102) may decrease as it goes downward. In other words, the inner tube (102) may be formed in a tapered shape. In another embodiment, the diameter of the inner tube (102) may be formed to be constant.

[0050] An upper housing (103) may be formed on the outer surface of the upper body (10). The upper housing (103) may be combined with a lower housing (203) described later to form an air drain (AD). The upper housing (103) protrudes radially from the outer surface of the upper body (10) and then bends downward. Accordingly, an internal space may be formed between the upper body (10) and the upper housing (103).

[0051] A plurality of upper supports (133) may be formed inside the upper housing (103). The upper supports (133) may be formed to protrude or extend downward from the inner upper surface of the upper housing (103). The number and shape of the upper supports (133) may vary depending on the embodiment.

[0052] Meanwhile, in the embodiments illustrated in FIGS. 1 to 6, the upper housing (103) and the lower housing (203) have a snap-fit ​​coupling structure. Accordingly, a plurality of hook receiving portions (131) that are coupled with a plurality of hooks (231) formed in the lower housing (203) may be formed in the upper housing (103). However, the coupling structure and coupling method of the upper housing (103) and the lower housing (203) may vary depending on the embodiment, and when the upper housing (103) and the lower housing (203) do not have a snap-fit ​​coupling structure, the hook receiving portions (131) may not be formed in the upper housing (103).

[0053] Additionally, in the embodiments illustrated in FIGS. 1 to 6, the upper housing (103) may be formed with a plurality of coupling protrusion receiving portions (132) for receiving a plurality of coupling protrusions (232) formed on the lower housing (203). Depending on the embodiment, the upper housing (103) may not be formed with the coupling protrusion receiving portions (132).

[0054] The lower body (20) may include a lower connecting portion (201) and a lower housing (203).

[0055] A second pipe or a second pipe fitting may be connected to the lower connecting portion (201). FIGS. 1 to 6 illustrate an embodiment in which a screw thread is formed on the other end of the lower connecting portion (201) so that the lower connecting portion (201) is connected to the second pipe.

[0056] In one embodiment, the screw threads formed on the other end of the lower connecting portion (201) can be engaged with the screw threads formed on the inner surface of the second fixing cap (401). A second elastic member (402) can be inserted into the other end of the lower connecting portion (201). With the second elastic member (402) inserted and the second fixing cap (401) hanging over the other end of the lower connecting portion (201), a second pipe can be inserted into the lower connecting portion (201) through the other end of the lower connecting portion (201). With the second pipe inserted into the lower connecting portion (201), the second pipe can be connected to the lower connecting portion (201) by rotating the second fixing cap (401) in a locking direction. It should be noted that this coupling structure and coupling method are merely one example, and the lower connecting portion (201) can be connected to the second pipe through other coupling structures and coupling methods. Depending on the embodiment, the second elastic member (402) may not be included in the pipe joint (1).

[0057] In another embodiment, the lower connecting portion (201) may be formed in the form of a pipe without threads. If the lower connecting portion (201) is formed in the form of a pipe, the lower connecting portion (201) may be connected to a second pipe fitting.

[0058] In one embodiment, a second step portion (201a) may be formed inside the lower connecting portion (201). The second step portion (201a) may support a second pipe inserted into the lower connecting portion (201). However, if the lower connecting portion (201) is formed in the shape of a pipe, the second step portion (201a) may be omitted.

[0059] A lower housing (203) may be formed on the outer surface of the lower body (20). The lower housing (203) may be combined with the aforementioned upper housing (103) to form an air drain (AD). The lower housing (203) protrudes radially from the outer surface of the lower body (20) and then bends upward. Accordingly, an internal space may be formed between the lower body (20) and the lower housing (203).

[0060] A plurality of ventilation holes (230) may be formed on the lower surface of the lower housing (203). External air may flow into the air drain (AD) through the ventilation holes (230).

[0061] The pipe joint (1) according to one embodiment may further include an air seat (30). The air seat (30) may be a ring-shaped member having the same shape as the cross-section of the lower housing (203). For example, when the cross-section of the lower housing (203) is circular as illustrated in FIGS. 1 to 6, the cross-section of the air seat (30) may also be circular.

[0062] The air sheet (30) may be placed inside the lower housing (203). More specifically, the air sheet (30) may be placed so as to cover a plurality of ventilation holes (203) formed in the lower housing (203). That is, when the air sheet (30) is placed inside the lower housing (203), at least a portion of the ventilation holes (203) may be covered by the air sheet (30). Accordingly, when no sewage or wastewater flows inside the pipe joint (1), at least a portion of the ventilation holes are covered by the air sheet (30), so that external air may not flow into the internal space of the lower housing or only a very small amount of air may flow into the internal space of the lower housing.

[0063] The air sheet (30) may be made of an elastic material (e.g., rubber). As described below, the weight or mass of the air sheet (30) may be set very small so that it can be lifted by the difference in air pressure between the inside of the air drain (AD) and the outside when negative pressure is generated inside the pipe joint (1).

[0064] In one embodiment, the inner diameter of the air seat (30) may be greater than or equal to the maximum distance (D1) of the upper support (133) formed inside the upper housing (103). Accordingly, when the air seat (30) moves up and down, the inner circumferential surface of the air seat (30) may be supported by the outer surface of the upper support (133).

[0065] In one embodiment, the lower body (20) may further include an inner wall (202) extending from one end of the lower connecting portion (201). When the upper housing (103) and the lower housing (203) are coupled, the inner wall (202) may be positioned between the upper support (133) and the inner pipe (102). The inner pipe (102) may serve to prevent foul odors that may occur when sewage or wastewater flows into the pipe joint (1) or to prevent sewage or wastewater from escaping outside the air drain (AD).

[0066] Meanwhile, in the embodiments illustrated in FIGS. 1 to 6, the upper housing (103) and the lower housing (203) have a snap-fit ​​joint structure. Accordingly, a plurality of hooks (231) that are coupled with a plurality of hook receiving holes (131) formed in the upper housing (103) can be formed in the lower housing (203). Accordingly, the upper housing (103) and the lower housing (203) can be fitted together as the hooks (231) of the upper housing (103) are received in the hook receiving holes (131) of the lower housing (203).

[0067] However, the joint structure and joint method of the upper housing (103) and the lower housing (203) may vary depending on the embodiment, and if the upper housing (103) and the lower housing (203) do not have a snap-fit ​​joint structure, a hook (231) may not be formed in the lower housing (203).

[0068] Additionally, in the embodiments illustrated in FIGS. 1 to 6, a plurality of engaging protrusions (232) may be formed on the lower housing (203) to be accommodated in a plurality of engaging protrusion receiving portions (132) formed on the upper housing (103). Depending on the embodiment, the engaging protrusions (232) may not be formed on the lower housing (203).

[0069] In one embodiment, the pipe fitting (1) may further include a third elastic member (31). When the upper housing (103) and the lower housing (203) are coupled, the third elastic member (31) may be inserted between the upper housing (103) and the lower housing (203). Depending on the embodiment, the third elastic member (31) may not be included in the pipe fitting (1).

[0070] Figures 5 and 6 illustrate cross-sectional views of a pipe joint (1) when an upper housing (103) and a lower housing (203) are combined to form an air drain (AD). In Figures 5 and 6, a first pipe (P1) is connected to the upper connecting portion (101), and a second pipe (P2) is connected to the lower connecting portion (201).

[0071] As illustrated in FIG. 5, when no sewage or wastewater flows or a small amount of sewage or wastewater flows inside the first pipe (P1), the pipe joint (1), and the second pipe (P2), negative pressure does not occur inside the first pipe (P1), the pipe joint (1), and the second pipe (P2). In this case, the air sheet (30) does not move, so the ventilation hole (230) is covered by the air sheet (30). Therefore, air does not flow in from the outside of the air drain (AD) through the ventilation hole (230).

[0072] However, when a large amount of sewage or wastewater flows through the first pipe (P1), the pipe joint (1), and the second pipe (P2), the air pressure inside the first pipe (P1), the pipe joint (1), and the second pipe (P2) decreases, and negative pressure is generated inside the first pipe (P1), the pipe joint (1), and the second pipe (P2).

[0073] Accordingly, when negative pressure is generated inside the air drain (AD), the difference between the internal and external pressures of the air drain (AD) increases, causing the air sheet (30) to move upward.

[0074] When the air sheet (30) moves upward, air can be introduced into the air drain (AD) from the outside of the air drain (AD) through the ventilation hole (230) as illustrated in FIG. 6. The air introduced into the air drain (AD) can be introduced into the pipe joint (1) along the path (F) illustrated in FIG. 6. That is, the air introduced through the ventilation hole (230) can pass through the space between the inner wall (202) and the inner pipe (102) over the inner wall (202) and the space between the lower connecting portion (201) and the inner pipe (102) to be introduced into the pipe joint (1). In another embodiment, when the inner wall (202) is not formed, the air introduced through the ventilation hole (230) can pass through the space between the lower connecting portion (201) and the inner pipe (102) to be introduced into the pipe joint (1).

[0075] In this way, when air flowing in through the ventilation hole (230) flows into the inside of the pipe joint (1), the negative pressure inside the pipe joint (1) can be relieved. Accordingly, the difference between the internal and external pressures of the air drain (AD) decreases, causing the air sheet (30) to move downward. When the air sheet (30) moves downward and covers the ventilation hole (230), the inflow of air through the ventilation hole (230) can be stopped.

[0076] Figures 7 to 10 illustrate other embodiments in which the method of joining the upper body and the lower body of the pipe joint is modified.

[0077] In the embodiments illustrated in FIGS. 1 to 6, the upper housing (103) and the lower housing (203) are coupled to each other by a snap-fit ​​method. However, the coupling structure and coupling method of the upper housing (103) and the lower housing (203) may vary depending on the embodiment.

[0078] For example, referring to FIG. 7, a coupling protrusion (134) may be formed on the lower end of the upper housing (103) of a pipe joint (1) according to another embodiment, and a coupling protrusion receiving portion (234) may be formed on the lower surface of the lower housing (203). According to this structure, the upper housing (103) and the lower housing (203) may be fitted together as the coupling protrusion (134) of the upper housing (103) is received in the coupling protrusion receiving portion (234) of the lower housing (203).

[0079] As another example, as illustrated in FIG. 8, a screw thread (135) may be formed on the inner side of the upper housing (103), and a screw thread (235) may be formed on the outer side of the lower housing (203). According to this structure, the upper housing (103) and the lower housing (203) may be coupled to each other by rotating the upper housing (103) in a locking direction while the upper housing (103) and the lower housing (203) are in contact with each other.

[0080] As another example, as illustrated in FIG. 9, the diameter of the upper housing (103) may be formed to be the same as the diameter of the lower housing (203). According to this structure, the upper housing (103) and the lower housing (203) may be coupled to each other by bonding the end of the upper housing (103) and the end of the lower housing (203) with an adhesive means.

[0081] As another example, as illustrated in FIG. 10, a plurality of engaging projection receiving portions (136) may be formed on the inner side of the upper housing (103) and a plurality of engaging projections (236) may be formed on the outer side of the lower housing (203). According to this structure, the upper housing (103) and the lower housing (203) may be aligned so that the engaging projection receiving portions (136) and the engaging projections (236) are aligned, and pressure is applied so that the upper housing (103) or the lower housing (203) is engaged with each other, thereby engaging the upper housing (103) and the lower housing (203) with each other.

[0082] Fig. 11 is a perspective view of a pipe joint according to another embodiment.

[0083] Referring to Fig. 11, a plurality of internal protrusions (140) may be formed inside the upper connecting portion (101) of a pipe joint (1) according to another embodiment. The internal protrusions (140) may increase the flow rate of sewage or wastewater flowing into the inside of the pipe joint (1) or may maintain the flow direction of sewage or wastewater constant.

[0084] In Fig. 11, the internal protrusions (140) are formed in a direction from the top to the bottom of the upper connecting portion (101), and are formed to protrude more as they go from the top to the bottom. However, the number and shape of the internal protrusions (140) may vary depending on the embodiment.

[0085] Fig. 12 is a longitudinal cross-sectional view of a pipe joint according to another embodiment.

[0086] As illustrated in Fig. 12, the diameter of the inner pipe part (102) extending from one end of the upper connecting part (101) of the pipe joint (1) according to another embodiment may be formed to be constant. In this case, the outer surface of the inner pipe part (102) and the inner surface of the lower connecting part (201) may be arranged to be spaced apart from each other by a constant interval. Accordingly, air introduced through the ventilation hole (230) may be introduced into the inside of the pipe joint (1) through the space between the inner pipe part (102) and the lower connecting part (201).

[0087] FIG. 13 is a drawing showing the lower surface of an upper housing included in a pipe fitting according to another embodiment.

[0088] As illustrated in Fig. 13, a plurality of upper supports (133) formed on the inner surface of the upper housing (103) can be arranged to be inclined at a predetermined angle (θ) from the center (C) of the cross-section of the upper housing (103). According to this structure, when external air flows into the air drain (AD) through the ventilation hole (230), the introduced air flows in an inclined direction at a predetermined angle (θ) while passing through the upper support (133), so that the introduced air rotates inside the air drain (AD) and flows into the space between the inner tube (102) and the lower connecting portion (201). Accordingly, the negative pressure generated inside the pipe joint (1) can be quickly relieved.

[0089] Figures 14 to 16 illustrate further embodiments in which the shape of the air drain (AD) of the pipe joint is modified.

[0090] In the embodiments illustrated in FIGS. 1 to 6, the cross-section of the air drain (AD) formed by combining the upper housing (103) and the lower housing (203) is circular. However, the shape of the cross-section of the air drain (AD) may vary depending on the embodiment.

[0091] For example, the cross sections of the upper housing (103), the lower housing (203), and the air drain (AD) can be manufactured in various shapes such as a square (Fig. 14), a hexagon (Fig. 15), and an octagon (Fig. 16).

[0092] Figure 17 illustrates another embodiment in which the upper connecting portion of the upper body of the pipe fitting is deformed.

[0093] As illustrated in Fig. 17, the upper connecting portion (101) of a pipe fitting (1) according to another embodiment may be formed in the form of a pipe. Accordingly, the upper connecting portion (101) may be inserted into or connected to another pipe fitting. Although not illustrated, in another embodiment, the lower connecting portion (201) of the pipe fitting (1) may also be formed in the form of a pipe.

[0094] Figure 18 illustrates another embodiment in which the upper connecting portion of the upper body of the pipe joint is deformed.

[0095] As illustrated in FIG. 18, a pipe joint (1) according to another embodiment may include a first upper connecting portion (101a) and a second upper connecting portion (101b).

[0096] One end of the first upper connecting portion (101a) may be connected to an air drain (AD) having the structure described above. The other end of the first upper connecting portion (101a) may be formed with screw threads for connection to a fixed cap (not shown).

[0097] A protruding structure (108) including a plurality of ribs and protrusions may be formed on the outer surface of the first upper connecting portion (101a). Depending on the embodiment, the protruding structure (108) may not be formed on the outer surface of the first upper connecting portion (101a).

[0098] The second upper connecting portion (101b) may be connected to one side of the first upper connecting portion (101a). The interior of the second upper connecting portion (101b) may be in communication with the interior of the first upper connecting portion (101a). A screw thread may be formed at the other end of the second upper connecting portion (101b) for connection with a fixing cap (not shown).

[0099] The pipe fitting (1) according to the embodiment illustrated in Fig. 18 includes two upper connecting portions, i.e., a first upper connecting portion (101a) and a second upper connecting portion (101b), and one lower connecting portion (201). That is, the pipe fitting (1) according to another embodiment may include multiple upper connecting portions or multiple lower connecting portions.

[0100] In addition, in the embodiment illustrated in Fig. 18, the other ends of the first upper connecting portion (101a) and the second upper connecting portion (101b) are formed with screw threads for fixing a pipe inserted into the interior of the first upper connecting portion (101a) and the second upper connecting portion (101b) using a fixing cap (not illustrated). However, in another embodiment, the first upper connecting portion (101a) or the second upper connecting portion (101b) may be formed in the form of a pipe, as illustrated in Fig. 17.

[0101] Although the present specification has been described with reference to the drawings exemplified above, the present specification is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art. Furthermore, even if the effects resulting from the configuration of the present specification have not been explicitly described and explained while describing the embodiments of the present specification, the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. Upper body; and comprising a lower body coupled to the upper body, The above upper body An upper connection connected to the first pipe or the first pipe joint; an internal pipe extending from one end of the upper connecting portion; and Includes an upper housing formed on the outer surface of the upper body, The above lower body A lower connection connected to a second pipe or a second pipe joint; and It includes a lower housing formed on the outer surface of the lower body and combined with the upper housing to form an air drain, A number of ventilation holes are formed on the lower surface of the lower housing, Further comprising an air sheet arranged to cover the above ventilation hole. Pipe fittings.

2. In paragraph 1, In a state where the upper housing and the lower housing are combined, the inner tube is placed inside the lower connecting portion. Pipe fittings.

3. In paragraph 1, The diameter of the inner tube decreases as it goes downward. Pipe fittings.

4. In paragraph 1, Inside the upper housing, a number of upper supports extending downward are formed. Pipe fittings.

5. In paragraph 4, The above air sheet is ring-shaped, The inner surface of the above air sheet is supported by the outer surface of the upper support. Pipe fittings.

6. In paragraph 1, The above lower body Further comprising an inner wall extending from one end of the lower connecting portion; Pipe fittings.

7. In paragraph 6, Inside the upper housing, a plurality of upper supports extending downward are formed, The above inner wall Placed between the inner tube and the upper support Pipe fittings.

8. In paragraph 1, When negative pressure is generated inside the pipe joint, the air sheet moves upward and air flows into the pipe joint through the ventilation hole. Pipe fittings.

9. In paragraph 8, The air flowing in through the above ventilation hole flows into the inside of the pipe joint through the space between the inner pipe part and the lower connecting part. Pipe fittings.

Images