Thermal self-anchoring nodular cast iron pipe

Abstract

A thermal self-anchored nodular cast iron pipe comprises a pipe socket and a pipe spigot, one end of the pipe spigot is inserted into one end of the pipe socket, a baffle ring is arranged on the outer ring of the end, located in the pipe socket, of the pipe spigot, and a plurality of arc-shaped baffle strips with the two sides abutting against the baffle ring and the check ring respectively are arranged on the outer ring, located between the check ring and the baffle ring, of the pipe spigot. The maximum outer diameter of the blocking strips is not smaller than the minimum inner diameter of the check ring, the blocking strips are made of steel or iron, the check ring is provided with a feeding notch capable of allowing the blocking strips to enter, and the designed arc-shaped blocking strips can form a plurality of contact points at the anchoring position of the pipe bell mouth and the pipe inserting mouth. More stable anchoring capacity is provided between the pipe bell mouth and the pipe spigot; compared with a traditional mode that a plurality of mounting grooves are formed for mounting barrier strips, the strength of the pipe bell mouth is enhanced, structural weakening caused by the fact that the mounting grooves are formed is avoided, and the overall service life of the pipeline is prolonged; and due to the selection of the material of the barrier strip, the wear resistance of the barrier strip is improved, and the overall anchoring effect and stability are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection design, in particular to a thermal self-anchored ductile iron pipe. Background Art

[0002] Ductile iron pipes are usually connected by plug-in connection, in which the socket of one pipe is connected to the spigot of another pipe. In order to prevent axial relative movement between the socket and the spigot in the opposite direction of the installation direction, an anchoring structure is installed between the two. For example, a socket-and-spigot pipe joint with an anchoring structure having application number CN201120284619.1 has a socket and a spigot connected by plug-in connection, and a number of blocks are used as anchoring structures.

[0003] Specifically, the inner wall of the socket is provided with block installation grooves corresponding to the plurality of blocks, and the block includes a rubber block located on the upper side thereof. During installation, the elastic properties of the rubber block are utilized to elastically squeeze and fix the plurality of blocks in the block installation grooves. Although this method can prevent axial relative movement between the socket and the plug to a certain extent, when the interface is deflected or fitted with a large gap, the rubber block will be subjected to repeated extrusion and wear. During long-term use, material loss of the rubber block may cause anchor failure. In addition, in order to install the block, a block installation groove is provided on the inner wall of the socket corresponding to each block, which may reduce the strength of the inner wall of the socket between two adjacent block installation grooves, thereby affecting the anchoring effect. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a thermal self-anchored ductile iron pipe.

[0005] The technical solution of this utility model is as follows:

[0006] A thermal self-anchoring ductile iron pipe comprises a pipe socket and a pipe spigot with one end inserted into one end of the pipe socket, and a retaining ring is provided on the outer ring of one end of the pipe spigot located inside the pipe socket. The above designs are all prior arts, and the pipe socket, the pipe spigot and the retaining ring are all made of ductile iron.

[0007] As the core technical concept of the utility model, a stop ring is provided on the inner ring at the end of the pipe socket, and a plurality of arc-shaped baffles are provided on the outer ring of the pipe insertion port located between the stop ring and the retaining ring, which are respectively pressed against the retaining ring and the stop ring on both sides, and the maximum outer diameter of the baffles is not less than the minimum inner diameter of the stop ring. The baffles are made of steel / iron, and the retaining ring is provided with a feeding notch for accommodating the baffles. It should be noted that, in order to facilitate processing and enhance the connection strength between the pipe socket and the stop ring, the material of the stop ring is usually set to the same ductile iron material as the pipe socket, so that the stop ring can be processed at one time when processing the pipe socket. During installation, the operator installs several retaining strips into the pipe through the feed notch in turn, and makes the inner and outer rings of the retaining strips press against the retaining ring and the stop ring respectively. Therefore, when axial relative movement occurs between the pipe socket and the pipe insert, or when the plug-in interface deflects or a large clearance is fitted, several arc-shaped retaining strips can form multiple contact points between the inner ring of the stop ring of the pipe socket and the outer ring of the pipe insert. When the structure is subjected to external forces, these contact points can disperse and absorb these forces, reduce the pressure at a single point, and thus provide a more stable anchoring capability between the pipe socket and the pipe insert. At the same time, compared with the traditional method of installing retaining strips by opening several installation grooves on the inner ring of the pipe socket, the above design enhances the strength of the pipe socket, avoids structural weakening caused by opening the installation grooves, and thus improves the overall service life of the pipeline. In addition, the selection of the material of the above retaining strips improves the wear resistance of the retaining strips, thereby enhancing the overall anchoring effect and the stability of the anchoring part.

[0008] As a further implementation:

[0009] Among the above-mentioned several baffles, there are two adjacent baffles, and their ends close to each other are located at the feed notch, which can prevent the soil or other impurities around the outside of the pipeline from entering the inside of the pipeline from the feed notch during installation. When the baffle specifications are selected to be relatively small, the above design can also prevent a single baffle from escaping from the feed notch when it is located at the feed notch.

[0010] Based on the above design, the sum of the center angles corresponding to several baffles is less than 360°, which is convenient for installing and adjusting the position of the baffle, and the absolute value of the difference between the sum of the center angles corresponding to several baffles and 360° is smaller than the center angle corresponding to the feed notch, so that there is an adjustment gap between the several baffles, which reduces the difficulty of adjusting the position of the baffles. At the same time, while ensuring that the baffles installed in sequence into the pipeline are tightly pressed against each other at one end, it can still meet the requirement that there are two adjacent baffles, whose ends close to each other are located at the position of the feed notch, so that a part of the feed notch is blocked by the baffle to prevent it from being completely exposed, thereby reducing the entry of soil or other impurities into the pipeline.

[0011] The abutting sides of the baffle strip and the stop ring are convex spherical surfaces, so that the contact point between the baffle strip and the stop ring can distribute the force more evenly when subjected to external force. This uniform force distribution helps to prevent excessive stress at specific points, thereby reducing the risk of fatigue or fracture of the baffle strip material. At the same time, the design of the spherical surface allows the baffle strip to have a certain degree of adaptability when in contact with the stop ring. This adaptive performance enables the connection part to adjust its position to a certain extent to adapt to the vibration caused by deflection or other external factors, thereby maintaining the stability of the anchoring. In addition, the baffle strip with a convex spherical surface can be more easily docked with the stop ring during installation because the spherical surface design provides better guidance and positioning, which simplifies the installation process.

[0012] As a further implementation:

[0013] A slag leakage notch is also provided on the retaining ring to facilitate fine-tuning of the position of the retaining bar during installation to ensure optimal fit between the retaining bar, the pipe socket and the retaining ring. During installation, dirt or other impurities may enter the pipe. The slag leakage notch provides a natural discharge channel so that these impurities can be removed during construction, thereby avoiding pipe blockage or wear caused by accumulation of impurities.

[0014] The center angle of the circle corresponding to the slag leakage gap is smaller than the center angle of the circle corresponding to a single baffle. This design ensures that there is sufficient contact area between several baffles and the inner circle of the pipe socket, ensuring its stability under normal use conditions, and preventing the baffle from escaping from the slag leakage gap when subjected to external force impact or other circumstances.

[0015] To facilitate the baffle to enter the pipeline, the maximum outer diameter of the baffle is not greater than the maximum inner diameter of the stop ring, to ensure that the baffle can be smoothly adjusted after being installed into the pipeline, that is, continue to adjust the baffle to slide to the predetermined position along the abutting side of the stop ring and the baffle.

[0016] To facilitate the installation of the baffle, one axial end of the baffle is tightly pressed against the baffle ring, and the other end is provided with an arc-shaped connecting strip that extends out of the pipe socket and fits with the outer ring of the pipe insertion port. The outer diameter of the arc-shaped connecting strip is smaller than the minimum inner diameter of the retaining ring. During installation, the baffle can be sent into the pipe by holding the connecting strip located outside the pipe socket.

[0017] Furthermore, an arc-shaped stop bar is provided on the outer ring of one end of the connecting bar away from the stop ring, and its outer diameter is larger than the minimum inner diameter of the stop ring. The stop bar is used to prevent further movement of the connecting bar, ensuring that the stop bar can stably stay in a predetermined position.

[0018] The difference between the minimum inner diameter of the stop ring and the outer diameter of the connecting strip is 4mm-8mm, so as to reserve deflection space between the pipe socket and the pipe spigot, so as not to squeeze the stop ring or the connecting strip, thereby ensuring the stability of the anchoring.

[0019] The beneficial effects of the utility model are:

[0020] 1. Several arc-shaped retaining strips are respectively pressed against the outer ring of the pipe socket and the inner ring of the retaining ring. This design allows the arc-shaped retaining strips to form multiple contact points at the anchoring point of the pipe socket and the pipe socket. When the structure is subjected to external forces or the pipe is deflected, these contact points can disperse and absorb these forces, reduce the pressure at a single point, and thus provide a more stable anchoring capability;

[0021] 2. Several baffles are installed into the pipe through an entry notch opened on the stop ring. Compared with opening several baffle installation grooves on the inner ring of the pipe socket, the damage to the pipe socket structure is reduced and the strength of the pipe socket is significantly enhanced. Combined with the design of the baffles made of steel or iron, the wear resistance of the pipe socket and the baffles against repeated extrusion and wear is further improved, thereby enhancing the overall service life and anchoring effect of the pipeline as a whole and enhancing the stability of the anchoring part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 This is a structural schematic diagram of a thermal self-anchored ductile iron pipe of the utility model (sectioned along the axial direction);

[0024] Figure 2 for Figure 1 A schematic diagram of the front view structure of the middle pipe socket;

[0025] Figure 3 for Figure 1 Top view of the middle anchor block;

[0026] Figure 4 for Figure 3 AA cross-section diagram of ;

[0027] The components represented by the reference numerals in the figure are:

[0028] 1. Pipe socket; 2. Pipe socket; 21. Stop ring; 22. Feeding gap; 23. Slag leakage gap; 3. Retaining ring; 4. Anchor block; 41. Retaining strip; 42. Connecting strip; 43. Blocking strip; 5. Avoidance chamber; 6. Sealing ring. DETAILED DESCRIPTION

[0029] Combination Figure 1The present embodiment provides a thermal self-anchoring ductile iron pipe, comprising a pipe socket 2 and a pipe spigot 1 with one end inserted inside one end of the pipe socket 2, a retaining ring 3 is provided on the outer ring of one end of the pipe spigot 1 located inside the pipe socket 2, the pipe socket 2, the pipe spigot 1 and the retaining ring 3 are all made of ductile iron, and a sealing ring 6 is also provided between the outer ring of the pipe spigot 1 located at its insertion end near the retaining ring 3 and the inner ring of the pipe socket 2. The above settings are all prior arts and will not be described in detail in the present embodiment. In order to improve the anchoring strength of the pipe spigot 1 inserted inside the pipe socket 2, a plurality of arc-shaped anchor blocks 4 are provided between the pipe spigot 1 and the pipe socket 2.

[0030] Combination Figure 3 and Figure 4 The anchor block 4 is made of steel / iron. The material design can improve the wear resistance of the anchor block 4, thereby enhancing the overall anchoring effect and the stability of the anchoring part. The anchor block 4 includes an arc-shaped baffle 41 and an arc-shaped connecting strip 42 arranged at one axial end thereof, and an arc-shaped blocking strip 43 arranged at the other axial end of the baffle 41.

[0031] In this embodiment, the anchor block 4 is preferably made of ductile iron, which is the same material as the pipeline, and ductile iron has high strength, good toughness and wear resistance.

[0032] Specifically, a stop ring 21 is provided on the inner ring of the end of the pipe socket 2, and a baffle 41 is provided on the outer ring of the pipe plug 1 between the stop ring 21 and the baffle ring 3, and the two sides of the baffle 41 are respectively pressed against the baffle ring 3 and the stop ring 21, and the maximum outer diameter of the baffle 41 is not less than the minimum inner diameter of the stop ring 21. When the pipe plug 1 and the pipe socket 2 are subjected to a pulling force opposite to the insertion direction, it is ensured that the baffle 41 can always remain in a state of being pressed against the stop ring 21 and the baffle ring 3 on both sides thereof, and will not fall out from between the pipe plug 1 and the pipe socket 2.

[0033] Combination Figure 2The stop ring 21 is provided with an inlet notch 22 capable of accommodating the entry of the retaining strips 41. During installation, the operator sequentially installs a plurality of retaining strips 41 into the pipe through the inlet notch 22, and makes the two sides of the retaining strips 41 respectively press against the stop ring 21 and the retaining ring 3, and the inner circle of the retaining strips 41 is in contact with the outer circle of the pipe socket 1. Therefore, when the pipe socket 2 and the pipe socket 1 produce axial relative movement, or when the plug interface is deflected or has a large clearance fit, a plurality of arc-shaped retaining strips 41 can form a plurality of contact points between the inner circle of the stop ring 21 and the outer circle of the pipe socket 1. These When the structure is subjected to external forces, the contact point can disperse and absorb these forces, reduce the pressure at a single point, and thus provide a more stable anchoring capability between the pipe socket 2 and the pipe plug 1; at the same time, compared with the traditional method of opening a plurality of installation grooves in the inner circle of the pipe socket 2 to install the retaining strip 41, the above design enhances the strength of the pipe socket 2, avoids structural weakening caused by the opening of the installation grooves, thereby improving the overall service life of the pipeline, and the selection of the material of the above retaining strip 41 improves the wear resistance of the retaining strip 41, thereby enhancing the overall anchoring effect and the stability of the anchoring part.

[0034] Among the above-mentioned several baffles 41, there are two adjacent baffles 41, and their ends close to each other are located at the position of the feed notch 22, which can prevent the soil or other impurities around the outside of the pipeline from entering the inside of the pipeline from the feed notch 22 during installation. When the specifications of the baffles 41 are selected to be relatively small, the above design can also prevent a single baffle 41 from escaping from the feed notch 22 when it is located at the feed notch 22.

[0035] Based on the above structure, the sum of the center angles corresponding to the plurality of baffles 41 is less than 360°, so as to facilitate the installation and adjustment of the position of the stopper, and the absolute value of the difference between the sum of the center angles corresponding to the plurality of baffles 41 and 360° is smaller than the center angle corresponding to the feed notch 22, so that there is an adjustment gap between the plurality of baffles 41, which reduces the difficulty of adjusting the position of the baffles 41. At the same time, while ensuring that the baffles 41 sequentially installed into the pipeline are pressed against each other at one end, it is still possible to satisfy the existence of two adjacent baffles 41, whose ends close to each other are located at the position of the feed notch 22, so that a part of the feed notch 22 is blocked by the stopper to prevent it from being completely exposed, thereby reducing the entry of soil or other impurities into the pipeline. For example, in actual application, eight identical anchor blocks 4 are designed, and the center angle corresponding to the baffle 41 in each anchor block 4 is 44°, and the feed notch 22 is 30°. Then the absolute value of the difference between the sum of the center angles corresponding to the eight baffles 41 and 360° is 8°, which is smaller than the center angle of 30° corresponding to the feed notch 22. For example, if the anchor blocks 4 are symmetrically installed along the middle of the feed notch 22, the center angle corresponding to the exposed part of the feed notch 22 is 8°, and the center angles corresponding to the parts of the two baffles on both sides located at the feed notch 22 are 11° respectively. When adjusting, the baffle 41 can be adjusted from the exposed part of the feed notch 22.

[0036] The abutting sides of the retaining strip 41 and the stop ring 21 are convex spherical surfaces. It can be understood that in order to make the two abut against each other, the inner ring surfaces of the stop ring 21 and the retaining strip 41 abutting against each other also need to be processed into concave spherical surfaces, so that the contact points between the retaining strip 41 and the stop ring 21 can distribute the force more evenly when subjected to external force. This uniform force distribution helps to prevent excessive stress at specific points, thereby reducing the risk of material fatigue or fracture of the retaining strip 41. At the same time, the design of the spherical surface allows the retaining strip 41 to have a certain degree of adaptability when in contact with the stop ring 21. This adaptive performance enables the connection part to adjust its own position to a certain extent to adapt to the vibration caused by deflection or other external factors, thereby maintaining the stability of the anchoring. In addition, the retaining strip 41 with a convex spherical surface can be more easily docked with the stop ring 21 during the installation process, because the spherical surface design provides better guidance and positioning, and also simplifies the installation process.

[0037] The maximum outer diameter of the retaining bar 41 is not greater than the maximum inner diameter of the retaining ring 21 to ensure that the retaining bar 41 can be smoothly adjusted in position after being installed into the pipe, that is, the retaining bar 41 is continuously adjusted to slide along the abutting side of the retaining ring 21 and the retaining bar 41 to a predetermined position.

[0038] One axial end of the baffle bar 41 is tightly pressed against the retaining ring 3, and the connecting strip 42 is arranged at the other end of the baffle bar 41, and the inner circle of the connecting strip 42 is fitted with the outer circle of the pipe socket 1, and the end of the connecting strip 42 away from the retaining ring 3 extends out of the pipe socket 2, and the blocking strip 43 is arranged on the outer circle of the connecting strip 42 outside the pipe socket 2. The outer diameter of the connecting strip 42 is smaller than the minimum inner diameter of the stop ring 21, and the outer diameter of the blocking strip 43 is larger than the minimum inner diameter of the stop ring 21. During installation, the baffle bar 41 is sent into the interior of the pipeline by holding the connecting strip 42 or the blocking strip 43 located outside the pipe socket 2, and during installation, the relationship between the outer diameter of the blocking strip 43 and the minimum inner diameter of the stop ring 21 is used to block the assembly outside the pipeline, thereby preventing the further movement of the connecting strip 42, so as to ensure that the baffle bar 41 can stay stably in the predetermined position, thereby facilitating the smooth installation of the baffle bar 41.

[0039] The outer diameter of the connecting strip 42 is 4mm-8mm smaller than the minimum inner diameter of the stop ring 21, so as to reserve a deflection space between the pipe socket 2 and the pipe insertion opening 1, so as not to squeeze the stop ring 21 or the connecting strip 42, thereby ensuring the stability of the anchoring.

[0040] The stop ring 21 and the pipe socket 2 are integrally formed, and the inner ring of the pipe socket 2 is also provided with an annular avoidance chamber 5, and the retaining ring 3 is located in the avoidance chamber 5. The axial cross-sectional shape of the avoidance chamber 5 is an arc shape with an opening toward the retaining bar 41, which is tangent to the axial cross-sectional line of the inner ring of the stop ring 21, so as to provide an avoidance space for the processing of the stop ring 21.

[0041] Combination Figure 2 A slag leakage notch 23 is also provided on the stop ring 21 to facilitate fine-tuning of the position of the retaining bar 41 during installation to ensure optimal fit between the retaining bar 41 and the pipe socket 1 and the stop ring 21. During installation, mud or other impurities may enter the interior of the pipeline. The slag leakage notch 23 provides a natural discharge channel so that these impurities can be removed during construction, thereby avoiding pipeline blockage or wear caused by accumulation of impurities.

[0042] The center angle corresponding to the slag leakage notch 23 is smaller than the center angle corresponding to a single baffle 41. This design ensures that there is sufficient contact area between the baffles 41 and the inner circle of the pipe socket 2, ensuring its stability under normal use conditions, and preventing the baffle 41 from escaping from the slag leakage notch 23 when subjected to external force impact or other circumstances.

Claims

1. A thermal self-anchoring ductile iron pipe, comprising a pipe socket (2) and a pipe spigot (1) with one end inserted into one end of the pipe socket (2), wherein a retaining ring (3) is provided on the outer ring of one end of the pipe spigot (1) located inside the pipe socket (2), characterized in that: The inner ring of the end of the pipe socket (2) is provided with a stop ring (21), and the outer ring of the pipe socket (1) located between the stop ring (21) and the retaining ring (3) is provided with a plurality of arc-shaped retaining strips (41) on both sides of which are respectively pressed against the retaining ring (3) and the stop ring (21), and the maximum outer diameter of the retaining strips (41) is not less than the minimum inner diameter of the stop ring (21); The retaining bar (41) is made of steel or iron, and the stop ring (21) is provided with an inlet notch (22) capable of accommodating the retaining bar (41) to enter.

2. A thermal self-anchored ductile iron pipe as claimed in claim 1, characterized in that: There are two adjacent blocking bars (41), and one end of the blocking bars (41) close to each other is located at the position of the feeding notch (22).

3. A thermal self-anchored ductile iron pipe as claimed in claim 2, characterized in that: The sum of the center angles corresponding to the plurality of baffles (41) is less than 360°, and the absolute value of the difference from 360° is less than the center angle corresponding to the feed notch (22).

4. A thermal self-anchored ductile iron pipe as claimed in claim 1, characterized in that: The abutting sides of the blocking strip (41) and the stop ring (21) are outwardly convex arc surfaces.

5. The thermal self-anchored ductile iron pipe according to claim 1, characterized in that: The stop ring (21) is also provided with a slag leakage notch (23), the corresponding center angle of which is smaller than the center angle of a single stop bar (41).

6. A thermal self-anchored ductile iron pipe as claimed in any one of claims 1 to 5, characterized in that: The maximum outer diameter of the blocking strip (41) is not greater than the maximum inner diameter of the stop ring (21).

7. A thermal self-anchored ductile iron pipe as claimed in claim 6, characterized in that: One axial end of the retaining strip (41) is tightly pressed against the retaining ring (3), and the other end is provided with an arc-shaped connecting strip (42) extending out of the pipe socket (2) and fitting against the outer ring of the pipe insertion opening (1), and the outer diameter of the arc-shaped connecting strip (42) is smaller than the minimum inner diameter of the stop ring (21).

8. A thermal self-anchored ductile iron pipe as claimed in claim 7, characterized in that: An arc-shaped blocking strip (43) is provided on the outer ring of one end of the connecting strip (42) away from the blocking ring (3), and the outer diameter of the arc-shaped blocking strip (43) is larger than the minimum inner diameter of the stop ring (21).

9. A thermal self-anchored ductile iron pipe as claimed in claim 7, characterized in that: The difference between the minimum inner diameter of the stop ring (21) and the outer diameter of the connecting strip (42) is 4 mm to 8 mm.

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