Building drainage vertical pipe, forming die and forming method thereof
阅读说明：本技术 建筑排水立管、其成型模具及其成型方法 (Building drainage vertical pipe, forming die and forming method thereof ) 是由 徐鑫 于 2020-07-01 设计创作，主要内容包括：本发明公开了一种建筑排水立管、其成型模具及成型方法,该立管包括立管本体和至少一条螺旋叶片,螺旋叶片在立管本体的内壁轴向整体上呈螺旋走向,螺旋叶片通过其底侧固定连接于立管本体的内壁；螺旋叶片的径向截面内侧呈第一正态分布曲线,第一正态分布曲线的横坐标轴处于立管本体的内壁的一条弦上,弦到立管本体圆心的距离大于立管本体内径的一半而小于立管本体的内径。其通过在建筑排水立管的内壁设置径向截面内侧呈第一正态分布曲线的螺旋内筋,完全消除了顶端尖锐及其与建筑排水立管内壁之间连接处的尖锐,降低排水时管内压力波动,降低下落水流速度。除此之外,该成型模具及成型方法,结构简单,成本低廉。(The invention discloses a building drainage vertical pipe, a forming die and a forming method thereof, wherein the vertical pipe comprises a vertical pipe body and at least one helical blade, the helical blade is in a helical trend on the whole axial direction of the inner wall of the vertical pipe body, and the helical blade is fixedly connected to the inner wall of the vertical pipe body through the bottom side of the helical blade; the inner side of the radial section of the helical blade is a first normal distribution curve, the abscissa axis of the first normal distribution curve is positioned on a chord of the inner wall of the stand pipe body, and the distance from the chord to the circle center of the stand pipe body is larger than half of the inner diameter of the stand pipe body and smaller than the inner diameter of the stand pipe body. The spiral inner rib with the radial section being the first normal distribution curve is arranged on the inner wall of the building drainage vertical pipe, so that the sharp top end and the sharp connecting part between the top end and the inner wall of the building drainage vertical pipe are completely eliminated, pressure fluctuation in the pipe during drainage is reduced, and the falling water flow speed is reduced. In addition, the forming die and the forming method have the advantages of simple structure and low cost.)
1. A building drainage vertical pipe is characterized by comprising a vertical pipe body (1) and at least one helical blade (2),
the helical blade (2) is in a helical trend on the whole axial direction of the inner wall of the vertical pipe body (1),
the helical blade (2) is fixedly connected to the inner wall of the vertical pipe body (1) through the bottom side of the helical blade;
the inner side of the radial section of the helical blade (2) is a first normal distribution curve, the abscissa axis of the first normal distribution curve is positioned on a chord of the inner wall of the vertical pipe body (1), and the distance from the chord to the circle center of the vertical pipe body (1) is greater than half of the inner diameter of the vertical pipe body (1) and less than the inner diameter of the vertical pipe body (1).
2. The building drainage riser of claim 1 wherein the functional expression of the first normal distribution curve isWherein a is the distance from the intersection point of the first normal distribution curve obtained by the function expression and the circle where the inner wall of the riser body (1) is located to the symmetry axis of the first normal distribution curve, the unit is mm, mu is the midpoint of the chord between the intersection point of the first normal distribution curve obtained by the function expression and the circle where the inner wall of the riser body (1) is located, and the value range of sigma is 0.02mm-2 mm.
3. The building drainage riser according to claim 1 or 2, wherein the normal distribution curve comprises at least three curves, wherein the transition between the left bottom edge of the helical blade (2) and the inner wall of the riser body (1) is a first curve (4), and the transition between the right bottom edge of the helical blade (2) and the inner wall of the riser body (1) is a second curve (3); the top point of the inner side of the spiral blade (2) is a third curve (5).
4. The forming mold for the construction drainage riser pipe as claimed in any one of claims 1 to 3, which comprises a riser pipe inner wall forming mold (A) and a riser pipe outer wall forming mold (B),
the vertical pipe inner wall forming die (A) is used for forming the inner wall of the building drainage vertical pipe through extrusion molding or cutting;
and the riser outer wall forming die (B) is used for extruding or cutting to form the outer wall of the building drainage riser.
5. The building drainage riser forming die according to claim 4, wherein the riser inner wall forming die (A) comprises a shaft sleeve (8), a plurality of first supporting spokes (7) and an inner wall shaping template body (6),
one end of the plurality of first supporting spokes (7) is fixedly connected to the outer wall of the shaft sleeve (8), and the inner wall shaping template body (6) is fixedly connected to the other end of the plurality of first supporting spokes (8), so that the inner wall shaping template body (6) is circular as a whole;
the inner wall shaping template body (6) is provided with at least one inner bulge (11), the inner bulge (11) is in a second normal distribution curve, the abscissa axis of the second normal distribution curve is positioned on a chord of the inner wall shaping template body (6), the distance from the chord to the circle center of the inner wall shaping template body (6) is greater than half of the inner diameter of the inner wall shaping template body (6) and smaller than the inner diameter of the inner wall shaping template body (6), and the shape of the first normal distribution curve is the same as that of the second normal distribution curve;
the shaft sleeve (8) is used for fixedly connecting an output shaft of the rotating motor.
6. The building drainage riser forming die according to claim 5, wherein the central angle between two adjacent first support spokes (7) in the plurality of first support spokes (7) is the same.
7. The building drainage riser forming die according to claim 5, wherein the riser outer wall forming die (B) comprises an outer wall shaping template (14), a plurality of second supporting spokes (15) and a circular clamp (13),
one end of the second supporting spokes (15) is fixedly connected to the outer wall of the outer wall shaping template (14) along the radial direction, and the other end of the second supporting spokes (15) is fixedly connected to the inner wall of the circular clamp (13) along the radial direction.
8. The building drainage riser forming die of claim 7, wherein the central angles between the plurality of second support spokes (15) in the plurality of second support spokes (15) are the same.
9. The building drainage riser forming die of claim 5, wherein the functional expression of the second normal distribution curve is
10. A method of forming a building drainage riser as claimed in any one of claims 1 to 3, including the steps of:
applying the outer wall forming die (B) of any one of claims 4 to 9 to first cut or extrude the material to be formed into a cylinder having a diameter equal to the outer diameter of the riser body (1);
fixing the cylinder;
processing a through hole at the axial center of the cylinder to obtain an intermediate product, wherein the diameter of the through hole is larger than or equal to the outer diameter of a shaft sleeve (8) of the inner wall forming die as claimed in any one of claims 4 to 9, and the diameter of the through hole is smaller than twice of the distance between the vertex of the inner bulge (11) and the axial center of the cylinder;
enabling an output shaft of the rotating motor to penetrate through the through hole from one end of the through hole and then penetrate out from the other end of the through hole;
fixedly connecting the inner wall forming die (A) to an output shaft of the rotating motor through the shaft sleeve (8);
fixing the rotating motor on a trolley which linearly moves along the axial direction of the building vertical pipe;
and starting the trolley while starting the rotating motor, so that the inner wall forming die (A) moves along the axial direction of the vertical pipe body (1), and the inner wall forming die (A) rotates along with an output shaft of the rotating motor to perform secondary cutting or extrusion molding on the intermediate product to obtain the building drainage vertical pipe.
Technical Field
The invention relates to the technical field of civil engineering, in particular to a building drainage vertical pipe, a forming die and a forming method thereof.
Background
The plastic pipe is a common pipe for building drainage, but because the inner wall of the plastic pipe is smooth and the friction resistance is small, when the plastic pipe is used for a building drainage vertical pipe, the water flow speed is high, when the flow is slightly large, water plug flow is easily formed, wherein the water plug flow means that when the building drainage vertical pipe is used for gravity drainage, when the flow is overlarge, the thickness of a water film attached to the pipe wall is overlarge or the water plug flow is influenced by the structure, water flow forms a central water mass to fall in the pipe, and the mass-shaped water flow falling in the pipe is formed. Under the water flow state, the water flow is slightly influenced by the friction resistance of the pipe wall, the descending speed is reduced quickly, and the accelerated flow is formed under the action of gravity. The pressure fluctuation is severe, the water flow noise is large, the water seal of the toilet floor drain is easy to damage, and the odor return phenomenon is easy to occur. Causing large pressure fluctuation in the pipe and bad smell in the toilet. This drawback limits the increase of the drainage capacity of the plastic pipe.
Disclosure of Invention
In view of the above, the invention provides a building drainage vertical pipe, a forming mold thereof and a forming method thereof, wherein a spiral inner rib is arranged on the inner wall of the building drainage vertical pipe, so that pressure fluctuation in the pipe during drainage is reduced, and the falling water flow speed is reduced. Thereby being more practical.
In order to achieve the first purpose, the technical scheme of the building drainage riser provided by the invention is as follows:
the invention provides a building drainage vertical pipe which comprises a vertical pipe body (1) and at least one helical blade (2), wherein the helical blade (2) is in a helical trend on the whole axial direction of the inner wall of the vertical pipe body (1), and the helical blade (2) is fixedly connected to the inner wall of the vertical pipe body (1) through the bottom side of the helical blade;
the inner side of the radial section of the helical blade (2) is a first normal distribution curve, the abscissa axis of the first normal distribution curve is positioned on a chord of the inner wall of the vertical pipe body (1), and the distance from the chord to the circle center of the vertical pipe body (1) is greater than half of the inner diameter of the vertical pipe body (1) and less than the inner diameter of the vertical pipe body (1).
The building drainage vertical pipe provided by the invention can be further realized by adopting the following technical measures.
Preferably, the functional expression of the first normal distribution curve is Wherein a is the distance from the intersection point of the first normal distribution curve obtained by the function expression and the circle where the inner wall of the riser body (1) is located to the symmetry axis of the first normal distribution curve, the unit is mm, mu is the midpoint of the chord between the intersection point of the first normal distribution curve obtained by the function expression and the circle where the inner wall of the riser body (1) is located, and the value range of sigma is 0.02mm-2 mm.
Preferably, the normal distribution curve at least comprises three sections of curves, wherein the transition between the left bottom edge of the helical blade (2) and the inner wall of the riser body (1) is a first curve (4), and the transition between the right bottom edge of the helical blade (2) and the inner wall of the riser body (1) is a second curve (3); the top point of the inner side of the spiral blade (2) is a third curve (5).
In order to achieve the second object, the invention provides a technical scheme of a forming die of a building drainage stand pipe, which comprises the following steps:
the invention provides a building drainage vertical pipe forming die which comprises a vertical pipe inner wall forming die (A) and a vertical pipe outer wall forming die (B),
the vertical pipe inner wall forming die (A) is used for forming the inner wall of the building drainage vertical pipe through extrusion molding or cutting;
and the riser outer wall forming die (B) is used for extruding or cutting to form the outer wall of the building drainage riser.
The forming die of the building drainage vertical pipe provided by the invention can be further realized by adopting the following technical measures.
Preferably, the riser inner wall forming die (A) comprises a shaft sleeve (8), a plurality of first supporting spokes (7) and an inner wall shaping die plate body (6),
one end of the plurality of first supporting spokes (7) is fixedly connected to the outer wall of the shaft sleeve (8), and the inner wall shaping template body (6) is fixedly connected to the other end of the plurality of first supporting spokes (8), so that the inner wall shaping template body (6) is circular as a whole;
the inner wall shaping template body (6) is provided with at least one inner bulge (11), the inner bulge (11) is in a second normal distribution curve, the abscissa axis of the second normal distribution curve is positioned on a chord of the inner wall shaping template body (6), the distance from the chord to the circle center of the inner wall shaping template body (6) is greater than half of the inner diameter of the inner wall shaping template body (6) and smaller than the inner diameter of the inner wall shaping template body (6), and the shape of the first normal distribution curve is the same as that of the second normal distribution curve;
the shaft sleeve (8) is used for fixedly connecting an output shaft of the rotating motor.
Preferably, the central angles between two adjacent first supporting spokes (7) in the plurality of first supporting spokes (7) are the same.
Preferably, the riser outer wall forming die (B) comprises an outer wall shaping template (14), a plurality of second supporting spokes (15) and a circular clamp (13),
one end of the second supporting spokes (15) is fixedly connected to the outer wall of the outer wall shaping template (14) along the radial direction, and the other end of the second supporting spokes (15) is fixedly connected to the inner wall of the circular clamp (13) along the radial direction.
Preferably, the central angles between the plurality of second supporting spokes (15) are the same among the plurality of second supporting spokes (15).
Preferably, the functional expression of the second normal distribution curve is
In order to achieve the third object, the invention provides a method for forming a building drainage stand pipe, which comprises the following steps:
the invention provides a building drainage riser forming method which comprises the following steps:
firstly, performing primary cutting or extrusion molding on a material to be molded by using the outer wall molding die (B) provided by the invention to obtain a cylinder, wherein the diameter of the cylinder is equal to the outer diameter of the stand pipe body (1);
fixing the cylinder;
processing a through hole at the axial center of the cylinder to obtain an intermediate product, wherein the diameter of the through hole is larger than or equal to the outer diameter of a shaft sleeve (8) of the inner wall forming die provided by the invention, and the diameter of the through hole is smaller than twice of the distance between the vertex of the inner bulge (11) and the axial center of the cylinder;
enabling an output shaft of the rotating motor to penetrate through the through hole from one end of the through hole and then penetrate out from the other end of the through hole;
fixedly connecting the inner wall forming die (A) to an output shaft of the rotating motor through the shaft sleeve (8);
fixing the rotating motor on a trolley which linearly moves along the axial direction of the building vertical pipe;
and starting the trolley while starting the rotating motor, so that the inner wall forming die (A) moves along the axial direction of the vertical pipe body (1), and the inner wall forming die (A) rotates along with an output shaft of the rotating motor to perform secondary cutting or extrusion molding on the intermediate product to obtain the building drainage vertical pipe.
According to the building drainage vertical pipe provided by the invention, the spiral inner ribs with radial sections in a first normal distribution curve are arranged on the inner wall of the building drainage vertical pipe, so that the pressure fluctuation in the pipe during drainage is reduced, and the falling water flow speed is reduced. Wherein, because the transition between helical blade 2's left side bottom edge and the inner wall of riser body 1 is first curve 4, the transition between helical blade 2's right side bottom edge and the inner wall of riser body 1 is second curve 3, consequently, can avoid the stress concentration between helical blade 2 and the junction of riser body 1 inner wall to reduce helical blade 2 and take place cracked possibility between riser body 1 inner wall, thereby improve the in service life. In addition, because the inner vertex of the helical blade 2 is the third curve 5, namely, the inner vertex of the helical blade 2 completely eliminates the sharp point, the problem of strong tendency that the water flow leaves the curvature and moves towards the center of the vertical pipe greatly can be avoided, the wall attaching effect of the water flow can be improved to the maximum extent, in addition, when the water flow is impacted, the abrasion loss can be reduced, and the noise during the water flow is reduced.
The building drainage vertical pipe forming die provided by the invention has the advantages of simple structure, easiness in realization, low processing cost, small required factory building area and low investment.
The method for forming the building drainage vertical pipe provided by the embodiment of the invention is simple and convenient to process and low in cost.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings.
In the drawings:
FIG. 1 is a schematic radial cross-sectional view of a building drainage riser provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an inner wall forming mold of a building drainage riser according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an outer wall forming die of a building drainage riser according to an embodiment of the invention;
fig. 4 is a schematic diagram illustrating a matching relationship between an inner wall forming mold and an outer wall forming mold provided by an embodiment of the present invention and a building drainage riser provided by the present invention;
FIG. 5 is a schematic radial cross-sectional view of an inner wall of a drainage riser of a building provided in an embodiment of the present invention;
FIG. 6 is an enlarged view of a portion C of FIG. 5;
fig. 7 is a flow chart illustrating steps of a method for forming a building drainage riser according to an embodiment of the present invention.
Detailed Description
In view of the above, the invention provides a building drainage vertical pipe, a forming die and a forming method thereof, wherein a spiral inner rib with a radial section of which the inner side is in a normal distribution curve is arranged on the inner wall of the building drainage vertical pipe, so that the sharp top end and the sharp connecting part between the spiral inner rib and the inner wall of the building drainage vertical pipe are completely eliminated, pressure fluctuation in the pipe during drainage is reduced, and the falling water flow speed is reduced. Thereby being more practical.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the building drainage stand pipe, the forming mold thereof and the forming method thereof according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.