A drain fitting

Abstract

The utility model relates to the technical field of pipe fitting, more particularly, relate to a drainage pipe fitting, including the adjusting pipe and be used for connecting the connecting pipe of drainage pipeline, the inner wall of adjusting pipe is pasted with the outer wall of connecting pipe, and with connecting pipe sliding connection, be equipped with the overflow groove of the through adjusting pipe side wall on adjusting pipe, the bottom height of overflow groove is greater than or equal to the height of connecting pipe top opening, by making adjusting pipe and connecting pipe relative sliding, make the relative height change between overflow groove and connecting pipe, adjust the farmland liquid level height when water flow through overflow groove and flow into adjusting pipe and connecting pipe, better adapt the growth needs of crops, improve the flexibility of use.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings technology, and more specifically, to a drainage pipe fitting. Background Technology

[0002] In recent years, the country has continuously promoted rural revitalization and agricultural modernization. Modernized planting techniques for traditional crops like rice have received increasing attention and promotion, with growing emphasis on the renovation of water supply and drainage infrastructure in paddy fields and the construction of high-standard farmland demonstration bases. By replacing the ditches and cement open channels used for farmland water supply with plastic pipes, pipeline transportation has significantly reduced the risk of ditch blockage and water evaporation, decreased leakage, and improved water conveyance efficiency. However, existing drainage pipe fittings cannot adjust the overflow level, failing to flexibly meet the different water level requirements of various crops. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies that cannot adjust the overflow liquid level, and to provide a drainage pipe fitting that can adjust the overflow liquid level according to the liquid level required for crop growth, thereby improving the flexibility of use.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A drainage pipe fitting is provided, including an adjusting pipe and a connecting pipe for connecting to a drainage pipeline. The inner wall of the adjusting pipe is fitted to the outer wall of the connecting pipe and is slidably connected to the connecting pipe. An overflow groove is provided on the adjusting pipe through the side wall of the adjusting pipe, and the bottom height of the overflow groove is greater than or equal to the height of the top opening of the connecting pipe.

[0005] This utility model discloses a drainage pipe fitting in which a connecting pipe is installed in a drainage ditch slightly below the field surface. One end of the connecting pipe is connected to the drainage pipe, and the other end is slidably connected to a regulating pipe. The regulating pipe and connecting pipe slide relative to each other according to the required liquid level for crop growth, adjusting the relative height between the overflow trough and the connecting pipe. When the liquid level in the farmland is higher than the bottom of the overflow trough, the liquid flows through the overflow trough into the regulating pipe, then into the connecting pipe, and finally into the drainage pipe, ultimately draining into the ditch on the side of the field ridge. By allowing the regulating pipe and connecting pipe to slide relative to each other, the relative height between the overflow trough and the connecting pipe changes, adjusting the liquid level in the farmland when water flows through the overflow trough into the regulating pipe and connecting pipe, thus better adapting to the needs of crop growth and improving the flexibility of use.

[0006] Furthermore, the outer wall of the connecting pipe is provided with at least one set of positioning posts of increasing length, the positioning posts being arranged vertically, and the bottom of the inner wall of the adjusting pipe is provided with at least one set of adjusting grooves that cooperate with the positioning posts, the positioning posts being inserted into the adjusting grooves. When it is necessary to increase the overflow liquid level, the longer positioning post is inserted into the adjusting groove, increasing the distance between the bottom of the overflow groove and the opening of the connecting pipe, thus raising the overflow groove height and the overflow liquid level; when it is necessary to decrease the overflow liquid level, the shorter positioning post is inserted into the adjusting groove, shortening the distance between the bottom of the overflow groove and the opening of the connecting pipe, thus lowering the overflow groove height and the overflow liquid level.

[0007] Furthermore, the adjusting groove includes a positioning groove and a clearance groove for avoiding the positioning post. The depth of the positioning groove is less than that of the clearance groove. The length of the positioning post is less than or equal to the depth of the clearance groove. The length of the positioning post is greater than or equal to the depth of the positioning groove. The positioning post is inserted into the positioning groove or the clearance groove. The top of the positioning post inserted into the positioning groove abuts against the bottom of the positioning groove. There is a gap between the positioning post inserted into the clearance groove and the inner wall of the clearance groove. When it is necessary to increase the overflow level, align the longer positioning column in a set of positioning columns with the positioning groove of the regulating pipe, and align the other positioning columns with the anti-cavity groove. Insert the positioning column into the positioning groove so that the top of the positioning column abuts against the bottom of the positioning groove. Insert the other positioning columns into the anti-cavity groove to prevent interference between the other positioning columns and the regulating pipe. The height of the bottom of the overflow groove relative to the opening of the connecting pipe increases, and the overflow level rises. When it is necessary to decrease the overflow level, insert the shorter positioning column in a set of positioning columns into the positioning groove, and insert the other positioning columns into the anti-cavity groove. The height of the overflow groove decreases, and the overflow level decreases.

[0008] Furthermore, the positioning groove is a trapezoidal groove, and the bottom width of the positioning groove is smaller than the opening width. The trapezoidal shape of the positioning groove allows for easy and quick insertion of the positioning post, while the narrower bottom of the groove enhances the lateral constraint on the positioning post.

[0009] Furthermore, the top of the regulating pipe is provided with a cap, and an upward-opening outer shell is connected to the outer periphery of the connecting pipe. Multiple water-permeable holes are provided on the sidewalls of the outer shell, and a positioning cap is installed on the top of the outer shell. The positioning cap is an annular cap, and the inner diameter of the positioning cap is equal to the outer diameter of the regulating pipe. The connecting pipe communicates with the outside only through the water-permeable holes, which can block larger debris and reduce the risk of blockage.

[0010] Furthermore, the outer shell includes a permeable section and a sedimentation section. The sedimentation section is connected to the bottom of the permeable section. The permeable holes are located on the sidewall of the permeable section. A sedimentation tank is provided inside the sedimentation section, and the top of the sedimentation tank is higher than the top of the connecting pipe. Sediment in the water enters the outer shell with the water flow. When the water flows through the sedimentation section, some of the sediment carried in the water settles in the sedimentation tank due to gravity, reducing the amount of sediment entering the connecting pipe and lowering the risk of blockage.

[0011] Furthermore, the cap is provided with multiple vent holes. These vent holes can balance the air pressure inside the regulating pipe and the outside environment. When the water flow is fast in heavy drainage scenarios such as rainstorms, the vent holes can replenish air, preventing negative pressure from forming inside the regulating pipe and hindering drainage. This solves the water-air balance problem during high-flow-rate drainage, improves drainage efficiency, and prevents drainage problems caused by air pressure imbalance.

[0012] Furthermore, an indicator is provided on the outer wall of the connecting pipe, and multiple scales are provided on the upper surface of the positioning cover. When the indicator is aligned with one of the scales, one of the positioning pins is inserted into the adjustment groove. The indicator on the outer wall of the connecting pipe cooperates with the scales on the surface of the positioning cover. When the indicator is aligned with a certain scale, the corresponding positioning pin is precisely inserted into the adjustment groove. The user can intuitively judge the current height of the adjusting pipe by observing the alignment relationship between the indicator and the scale, which facilitates the adjustment of the overflow liquid level.

[0013] Furthermore, the top of the outer casing is provided with multiple slots, and the outer periphery of the positioning cover is provided with locking blocks that mate with the multiple slots. The locking blocks engage with the slots. The engagement of the locking blocks with the slots prevents the positioning cover from rotating relative to the outer casing, thus fixing the scale position on the upper surface of the positioning cover and improving the accuracy of adjusting the overflow height.

[0014] Furthermore, the overflow channel is an elongated channel, and the overflow channels are evenly distributed along the circumference of the regulating pipe. Water can enter the regulating pipe from multiple directions through the overflow channels, improving drainage efficiency; the evenly distributed structure balances the forces on the regulating pipe, reducing wear caused by local water flow impact.

[0015] Compared with the prior art, the beneficial effects of this utility model are: The drainage pipe fitting of this utility model has the following advantages: 1. By allowing the regulating pipe and the connecting pipe to slide relative to each other, the relative height between the overflow trough and the connecting pipe can be changed, thereby adjusting the water level in the farmland when the water flows into the regulating pipe and the connecting pipe through the overflow trough, better adapting to the growth needs of crops and improving the flexibility of use; 2. A sedimentation trough is set up, and some of the silt carried in the water flow settles in the sedimentation trough due to gravity, reducing the amount of silt entering the connecting pipe and reducing the risk of blockage; 3. A vent is set on the cover, which can replenish air and prevent the formation of negative pressure in the regulating pipe that hinders drainage, solving the water-air balance problem when draining large flow rates, improving drainage efficiency, and preventing drainage problems caused by air pressure imbalance. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the drainage pipe fitting of this utility model; Figure 2 This is a schematic diagram of the first structure of the regulating pipe of the drainage pipe fitting of this utility model; Figure 3 This is a schematic diagram of the second structure of the regulating pipe of the drainage pipe fitting of this utility model; Figure 4 This is a schematic diagram of the positioning cover of the drainage pipe fitting of this utility model; Figure 5 This is a first structural schematic diagram of the outer shell of the drainage pipe fitting of this utility model; Figure 6 This is a second structural schematic diagram of the outer shell of the drainage pipe fitting of this utility model; Figure 7 This is a schematic diagram of the installation of the drainage pipe fitting of this utility model.

[0017] In the attached diagram: 1. Connecting pipe; 11. Positioning post; 2. Adjusting pipe; 21. Socket section; 211. Positioning groove; 212. Void relief groove; 22. Overflow section; 221. Overflow groove; 222. Indicator; 3. Outer shell; 31. Water-permeable section; 311. Water-permeable hole; 312. Slot; 32. Sedimentation section; 4. Positioning cover; 41. Scale; 42. Locking block; 5. Sealing cover; 51. Vent hole; 6. Field surface; 7. Irrigation ditch; 8. Drainage pipeline. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0019] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Example 1 like Figures 1 to 7 The first embodiment of the drainage pipe fitting of this utility model is shown, including an adjusting pipe 2 and a connecting pipe 1 for connecting to a drainage pipe 8. The inner wall of the adjusting pipe 2 is fitted with the outer wall of the connecting pipe 1 and is slidably connected to the connecting pipe 1. An overflow groove 221 is provided on the adjusting pipe 2 through the side wall of the adjusting pipe 2. The bottom height of the overflow groove 221 is greater than or equal to the height of the top opening of the connecting pipe 1.

[0021] The drainage pipe fitting of this utility model involves installing a connecting pipe 1 in a drainage ditch slightly lower than the field surface 6. One end of the connecting pipe 1 is connected to the drainage pipe 8, and the other end is slidably connected to the regulating pipe 2. Based on the required liquid level for crop growth, the regulating pipe 2 and the connecting pipe 1 are slid relative to each other, adjusting the relative height between the overflow trough 221 and the connecting pipe 1. When the liquid level in the farmland is higher than the bottom of the overflow trough 221, the liquid flows through the overflow trough 221 into the regulating pipe 2, then into the connecting pipe 1, and finally into the drainage pipe 8, ultimately draining into the ditch on the side of the field ridge. Figure 7 As shown, by sliding the regulating pipe 2 relative to the connecting pipe 1, the relative height between the overflow trough 221 and the connecting pipe 1 changes, thereby adjusting the water level in the farmland when the water flows through the overflow trough 221 into the regulating pipe 2 and the connecting pipe 1, better adapting to the growth needs of crops and improving the flexibility of use.

[0022] like Figure 3 and Figure 6 As shown, the outer wall of the connecting pipe 1 is provided with at least one set of positioning posts 11 of increasing length. The positioning posts 11 are arranged vertically. The bottom of the inner wall of the adjusting pipe 2 is provided with at least one set of adjusting grooves that cooperate with the positioning posts 11. The positioning posts 11 are inserted into the adjusting grooves. When it is necessary to increase the overflow liquid level, the longer positioning post 11 is inserted into the adjusting groove, the distance between the bottom of the overflow groove 221 and the opening of the connecting pipe 1 increases, the height of the overflow groove 221 rises, and the overflow liquid level rises. When it is necessary to decrease the overflow liquid level, the shorter positioning post 11 is inserted into the adjusting groove, the distance between the bottom of the overflow groove 221 and the opening of the connecting pipe 1 shortens, the height of the overflow groove 221 decreases, and the overflow liquid level decreases.

[0023] In this embodiment, the regulating pipe 2 includes a socket section 21 and an overflow section 22 that are connected to each other. The connecting pipe 1 is inserted into the socket section 21. The regulating groove is provided on the inner wall of the socket section 21, and the overflow groove 221 is provided on the overflow section 22.

[0024] like Figure 3 and Figure 6 As shown, the adjustment groove includes a positioning groove 211 and a clearance groove 212 for avoiding the positioning post 11. The depth of the positioning groove 211 is less than that of the clearance groove 212. The length of the positioning post 11 is less than or equal to the depth of the clearance groove 212. The length of the positioning post 11 is greater than or equal to the depth of the positioning groove 211. The positioning post 11 is inserted into the positioning groove 211 or the clearance groove 212. The top of the positioning post 11 inserted into the positioning groove 211 abuts against the bottom of the positioning groove 211. There is a gap between the positioning post 11 inserted into the clearance groove 212 and the inner wall of the clearance groove 212. When it is necessary to increase the overflow level, align the longer positioning column 11 in a set of positioning columns 11 with the positioning groove 211 of the regulating pipe 2, and align the other positioning columns 11 with the anti-cavity groove 212. Insert the positioning column 11 into the positioning groove 211 so that the top of the positioning column 11 abuts against the bottom of the positioning groove 211, and insert the other positioning columns 11 into the anti-cavity groove 212 to prevent the other positioning columns 11 from interfering with the regulating pipe 2. The height of the bottom of the overflow groove 221 relative to the opening of the connecting pipe 1 increases, and the overflow level rises. When it is necessary to decrease the overflow level, insert the shorter positioning column 11 in a set of positioning columns 11 into the positioning groove 211, and insert the other positioning columns 11 into the anti-cavity groove 212. The height of the overflow groove 221 decreases, and the overflow level decreases.

[0025] In this embodiment, each group of positioning posts 11 includes three positioning posts 11 with increasing lengths, referred to as the first positioning post, the second positioning post, and the third positioning post, respectively. Each positioning groove 211 has two clearance grooves 212 on both sides. When the first positioning post is inserted into the positioning groove 211, the second and third positioning posts are inserted into the two clearance grooves 212 on the same side of the positioning groove 211. When the third positioning post is inserted into the positioning groove 211, the first and second positioning posts are inserted into the two clearance grooves 212 on the other side of the positioning groove 211. When the second positioning post is inserted into the positioning groove 211, the first and second positioning posts are inserted into the two clearance grooves 212 adjacent to the positioning groove 211, respectively. The first, second, and third positioning posts of the same group are arranged sequentially along the circumferential direction of the adjusting tube 2. There are two groups of positioning posts 11, two positioning grooves 211, and four clearance grooves 212.

[0026] The positioning groove 211 and the clearance groove 212 are trapezoidal grooves, and the bottom width of the positioning groove 211 and the clearance groove 212 is smaller than the opening width. The trapezoidal grooves 211 and 212 have inclined sidewalls that can guide the positioning post 11 to be inserted, which is convenient and quick. At the same time, the narrower bottom of the positioning groove 211 can enhance the lateral constraint on the positioning post 11.

[0027] Overflow trough 221 is a long strip-shaped trough, and overflow trough 221 is evenly distributed along the circumference of regulating pipe 2, such as Figure 2 and Figure 3 As shown, water can flow into the regulating pipe 2 from multiple directions through the overflow trough 221, improving drainage efficiency; the uniformly distributed structure balances the forces on the regulating pipe 2, reducing wear caused by local water flow impact.

[0028] The working principle of the drainage pipe fitting in this embodiment is as follows: The connecting pipe 1 is installed in a drainage ditch slightly lower than the field surface 6. The regulating pipe 2 is fitted onto the connecting pipe 1, so that one end of the connecting pipe 1 is connected to the drainage pipe 8, and the other end is slidably connected to the regulating pipe 2. Based on the required liquid level for crop growth, the regulating pipe 2 and the connecting pipe 1 slide relative to each other, and a positioning post 11 of appropriate length is inserted into the positioning groove 211. When the minimum overflow liquid level is required, the first positioning post is inserted into the positioning groove 211, so that the first positioning post abuts against the bottom of the positioning groove 211. The second and third positioning posts are then inserted into the clearance groove 212, without interfering with the regulating pipe 2 and the connecting pipe. The relative movement between 1; when a higher overflow liquid level is required, the second positioning post is inserted into the positioning groove 211, and the first and third positioning posts are respectively inserted into the clearance grooves 212 located on both sides of the positioning groove 211; when the highest overflow liquid level is required, the third positioning post is inserted into the positioning groove 211, and the first and second positioning posts are inserted into the clearance grooves 212; when the liquid level in the farmland is higher than the bottom of the overflow trough 221, the liquid flows simultaneously into the regulating pipe 2 from multiple directions around the circumference of the regulating pipe 2 through the elongated overflow trough 221, then flows into the connecting pipe 1, and then into the drainage pipe 8 through the connecting pipe 1, and finally into the ditch on the side of the field ridge, such as Figure 7 As shown.

[0029] Example 2 This embodiment is the second embodiment of the drainage pipe fitting of this utility model. This embodiment is similar to the first embodiment, except that the top of the regulating pipe 2 is provided with a cap 5, and an upward-opening outer shell 3 is connected to the outer periphery of the connecting pipe 1. The side wall of the outer shell 3 is provided with multiple water-permeable holes 311, and a positioning cap 4 is installed on the top of the outer shell 3. The positioning cap 4 is an annular cap, and the inner diameter of the positioning cap 4 is equal to the outer diameter of the regulating pipe 2. The connecting pipe 1 communicates with the outside only through the water-permeable holes 311. The water-permeable holes 311 can block larger debris, reducing the risk of blockage. In this embodiment, the outer shell 3 and the connecting pipe 1 are integrally formed.

[0030] like Figure 5 and Figure 6 As shown, the outer shell 3 includes a permeable section 31 and a sedimentation section 32. The sedimentation section 32 is connected to the bottom of the permeable section 31. A permeable hole 311 is provided on the side wall of the permeable section 31. A sedimentation tank is provided inside the sedimentation section 32, and the top of the sedimentation tank is higher than the top of the connecting pipe 1. The silt in the water enters the outer shell 3 with the water flow. When the water flows through the sedimentation section 32, some of the silt carried in the water settles in the sedimentation tank due to gravity, reducing the amount of silt entering the connecting pipe 1 and reducing the risk of blockage.

[0031] like Figures 1 to 3 As shown, the cover 5 is provided with multiple vent holes 51. The multiple vent holes 51 on the cover 5 can balance the air pressure inside the regulating pipe 2 and the outside. When the water flow is fast in strong drainage scenarios such as heavy rain, the vent holes 51 can replenish air, avoid the formation of negative pressure inside the regulating pipe 2 to hinder drainage, solve the water-air balance problem during high-flow drainage, improve drainage efficiency, and prevent drainage problems caused by air pressure imbalance.

[0032] The working principle of the drainage pipe fitting in this embodiment is as follows: The connecting pipe 1 is installed in the drainage ditch at a height slightly lower than the field surface 6. One end of the connecting pipe 1 is connected to the drainage pipe 8, and the other end is slidably connected to the regulating pipe 2. According to the liquid level required for crop growth, the positioning column 11 inserted into the positioning groove 211 is switched to adjust the relative height between the overflow groove 221 and the connecting pipe 1 to a suitable value. The water flows into the sedimentation tank of the outer shell 3 through the permeable hole 311. Excessively large debris is blocked outside the outer shell 3 by the permeable hole 311. Some of the mud and sand carried in the water settles in the sedimentation tank due to gravity. When the liquid level is higher than the bottom of the overflow groove 221, the water that has removed some of the mud and sand flows into the regulating pipe 2 through the overflow groove 221, and then into the connecting pipe 1. It then flows into the drainage pipe 8 through the connecting pipe 1. Air enters the regulating pipe 2 through the vent hole 51 to replenish the air and maintain the air pressure in the regulating pipe 2, preventing the formation of negative pressure in the regulating pipe 2 and hindering drainage.

[0033] Example 3 This embodiment is the third embodiment of the drainage pipe fitting of this utility model. This embodiment is similar to embodiment two, except that, as Figures 2 to 4 As shown, an indicator 222 is provided on the outer wall of the connecting pipe 1, and multiple scales 41 are provided on the upper surface of the positioning cover 4. When the indicator 222 is aligned with a scale 41, a positioning pin 11 is inserted into the positioning groove 211. The indicator 222 on the outer wall of the connecting pipe 1 cooperates with the scales 41 on the surface of the positioning cover 4. When the indicator 222 is aligned with a certain scale 41, the corresponding positioning pin 11 is inserted into the positioning groove 211. The user can intuitively judge the current height of the adjusting pipe 2 by observing the alignment relationship between the indicator 222 and the scale 41, which facilitates the adjustment of the overflow liquid level.

[0034] In this embodiment, the indicator 222 is a groove extending along the axis of the connecting pipe 1. The upper surface of the positioning cover 4 is provided with three scales 41, which are marked as low scale, medium scale and high scale respectively. When the indicator 222 is aligned with the low scale, the first positioning post is inserted into the positioning groove 211, and the overflow height is the lowest. When the indicator 222 is aligned with the medium scale, the second positioning post is inserted into the positioning groove 211. To facilitate the identification of the scales 41, the lengths of the low scale, medium scale and high scale increase sequentially. When the indicator 222 is aligned with the high scale, the third positioning post is inserted into the positioning groove 211, and the overflow height is the highest.

[0035] like Figures 4 to 6 As shown, the top of the outer casing 3 is provided with multiple slots 312, and the outer periphery of the positioning cover 4 is provided with locking blocks 42 that cooperate with the multiple slots 312. The locking blocks 42 engage with the slots 312. The engagement of the locking blocks 42 with the slots 312 can prevent the positioning cover 4 from rotating relative to the outer casing 3, thus fixing the position of the scale 41 on the upper surface of the positioning cover 4 and improving the accuracy of adjusting the overflow height. In this embodiment, the multiple locking blocks 42 are asymmetrically distributed on the outer periphery of the positioning cover 4, so that the position of the scale 41 of the positioning cover 4 is determined during installation, avoiding installation errors.

[0036] The working principle of the drainage pipe fitting in this embodiment is as follows: When adjusting the overflow liquid level, the adjusting pipe 2 is slidably connected to the connecting pipe 1, and the positioning pin 11 of appropriate length is inserted into the positioning groove 211. The locking block 42 of the positioning cover 4 is locked into the locking groove 312 on the top of the outer shell 3, so that the position of the scale 41 of the positioning cover 4 is fixed. When the lowest overflow liquid level is required, the adjusting pipe 2 is rotated so that the indicator 222 is aligned with the low scale. At this time, the first positioning pin is aligned with the positioning groove 211. The first positioning pin is inserted into the positioning groove 211, and the second positioning pin is inserted into the positioning groove 211. The positioning pin and the third positioning pin are inserted into the cavitation groove 212. When a medium overflow liquid level is required, rotate the adjusting pipe 2 to align the indicator 222 with the middle scale, insert the second positioning pin into the positioning groove 211, and insert the first positioning pin and the third positioning pin into the cavitation groove 212 located on both sides of the positioning groove 211. When the highest overflow liquid level is required, rotate the adjusting pipe 2 to align the indicator 222 with the high scale, insert the third positioning pin into the positioning groove 211, and insert the first positioning pin and the second positioning pin into the cavitation groove 212.

[0037] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0038] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A drainage pipe fitting, characterized in that, It includes an adjusting pipe (2) and a connecting pipe (1) for connecting to a drainage pipe (8). The inner wall of the adjusting pipe (2) is attached to the outer wall of the connecting pipe (1) and is slidably connected to the connecting pipe (1). The adjusting pipe (2) is provided with an overflow groove (221) that penetrates the side wall of the adjusting pipe (2). The bottom height of the overflow groove (221) is greater than or equal to the height of the top opening of the connecting pipe (1).

2. The drainage pipe fitting according to claim 1, characterized in that, The outer wall of the connecting pipe (1) is provided with at least one set of positioning posts (11) with increasing length. The positioning posts (11) are arranged in a vertical direction. The bottom of the inner wall of the adjusting pipe (2) is provided with at least one set of adjusting grooves that cooperate with the positioning posts (11). The positioning posts (11) are inserted into the adjusting grooves.

3. The drainage pipe fitting according to claim 2, characterized in that, The adjustment groove includes a positioning groove (211) and a clearance groove (212) for avoiding the positioning post (11). The depth of the positioning groove (211) is less than that of the clearance groove (212). The length of the positioning post (11) is less than or equal to the depth of the clearance groove (212). The length of the positioning post (11) is greater than or equal to the depth of the positioning groove (211). The positioning post (11) is inserted into the positioning groove (211) or the clearance groove (212). The top of the positioning post (11) inserted into the positioning groove (211) abuts against the bottom of the positioning groove (211). There is a gap between the positioning post (11) inserted into the clearance groove (212) and the inner wall of the clearance groove (212).

4. The drainage pipe fitting according to claim 3, characterized in that, The positioning groove (211) is a trapezoidal groove, and the bottom width of the positioning groove (211) is smaller than the opening width.

5. The drainage pipe fitting according to any one of claims 2 to 4, characterized in that, The top of the regulating pipe (2) is provided with a cap (5), and the outer periphery of the connecting pipe (1) is connected to an outer shell (3) with an upward opening. The side wall of the outer shell (3) is provided with multiple water-permeable holes (311). The top of the outer shell (3) is equipped with a positioning cap (4). The positioning cap (4) is an annular cap, and the inner diameter of the positioning cap (4) is equal to the outer diameter of the regulating pipe (2).

6. The drainage pipe fitting according to claim 5, characterized in that, The outer shell (3) includes a water-permeable section (31) and a sedimentation section (32). The sedimentation section (32) is connected to the bottom of the water-permeable section (31). The water-permeable hole (311) is provided on the side wall of the water-permeable section (31). The sedimentation section (32) is provided with a sedimentation tank. The top of the sedimentation tank is higher than the top of the connecting pipe (1).

7. The drainage pipe fitting according to claim 5, characterized in that, The cover (5) is provided with multiple vent holes (51).

8. The drainage pipe fitting according to claim 5, characterized in that, The side wall of the connecting pipe (1) is provided with an indicator (222), and the upper surface of the positioning cover (4) is provided with multiple scales (41). When the indicator (222) is aligned with one of the scales (41), a positioning post (11) is inserted into the adjustment groove.

9. The drainage pipe fitting according to claim 8, characterized in that, The top of the outer shell (3) is provided with multiple slots (312), and the outer periphery of the positioning cover (4) is provided with a locking block (42) that cooperates with the multiple slots (312). The locking block (42) engages with the slots (312).

10. The drainage pipe fitting according to claim 1, characterized in that, The overflow groove (221) is a long strip groove, and the overflow groove (221) is evenly distributed along the circumference of the regulating pipe (2).

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