Anti-disengaging connector structure of nodular cast iron pipe

Abstract

The utility model discloses an anti-drop connector structure of a nodular cast iron pipe, which belongs to the technical field of nodular cast iron pipe connectors and comprises a bellmouth of the nodular cast iron pipe and an insertion opening of the nodular cast iron pipe. The periphery of the clamping and limiting cylindrical shaft is sleeved with a reset spring. A thrust structure is arranged at the position, corresponding to the movable cavity, of the end of the bellmouth. After the inserting opening is inserted into the bell mouth, the gap between the inserting opening and the bell mouth is sealed through the sealing ring, then the pressing screw is screwed, and after the arc end is in contact with the slope face of the wedge-shaped driven block, the wedge-shaped driven block can be tightly pressed under the action of the pressing screw which is continuously screwed in. The arc end continuously pushes the clamping and limiting cylindrical shaft towards the limiting ring groove through the slope face of the wedge-shaped driven block, and after the clamping and limiting cylindrical shaft is clamped into the limiting ring groove, an insertion opening inserted into the bell mouth is subjected to anti-falling treatment, so that even if the connector part between nodular cast iron pipelines is located at the bent part of the whole pipeline, the clamping and limiting cylindrical shaft can be prevented from falling off. And the situation that the spigot and the bellmouth are loosened or even disengaged can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of the joints of ductile iron pipes, and more specifically, to an anti-disengagement joint structure of a ductile iron pipe. Background Art

[0002] Ductile iron pipes are pipes cast by high-speed centrifugal casting of cast iron molten metal added with a spheroidizing agent, and are simply called spherical pipes, ductile iron pipes, ductile iron cast pipes, etc. They are mainly used for the transportation of tap water and are ideal materials for tap water pipelines.

[0003] During the design and construction of underground ductile iron pipelines, due to differences in geological conditions and the congestion of existing underground structures, etc., it is often necessary to change the route of the ductile iron pipeline, which will cause a part of the ductile iron pipeline to be curved. During the installation of ductile iron pipes, the socket at one end of a ductile iron pipe needs to be inserted into the socket of another ductile iron pipe end, and the gap between the socket and the socket is sealed by a sealing ring arranged in the socket.

[0004] Since the fluid transported in the ductile iron pipeline has a relatively high flow rate and a large impact force on the turning part of the ductile iron pipeline, the socket at the end of the ductile iron pipe at the turning part of the pipeline is likely to displace from the socket under the action of the fluid impact. Over time, the displacement between the socket and the socket gradually increases, resulting in a gradual increase in the gap between the socket and the socket. This not only reduces the sealing performance of the connection of the ductile iron pipe, easily causing fluid leakage, but also makes the socket easily disengage from the socket, thereby causing more serious fluid leakage. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-disengagement joint structure of a ductile iron pipe, to avoid the loosening or even disengagement between the socket and the socket, and to ensure the firmness of the installation of the joint part of the ductile iron pipe.

[0006] The utility model is realized by the following technical solutions:

[0007] An anti-disengagement joint structure of a ductile iron pipe includes the socket of a ductile iron pipe and the socket of a ductile iron pipe, and the socket is inserted into the socket;

[0008] An active cavity is arranged inside the wall thickness of the socket. A wedge-shaped passive block is arranged in the active cavity. A limiting cylindrical shaft is connected to the wedge-shaped passive block. A return spring is sleeved on the outer circumference of the limiting cylindrical shaft. The bottom end of the limiting cylindrical shaft penetrates through the side wall of the inner cavity of the socket and extends into the inner cavity of the socket. A limiting ring groove for the end of the limiting cylindrical shaft to be buckled into is arranged in a ring on the side wall of the socket; A thrust structure is arranged at the position corresponding to the end of the socket and the active cavity.

[0009] As an alternative solution to the technical solution of this utility model document, a sealing groove is provided on the inner wall of the socket end, and a sealing ring is provided in the sealing groove.

[0010] As an alternative solution to the technical solution of this utility model document, a marking line is also marked on the outer wall of the spigot.

[0011] As an alternative solution to the technical solution of this utility model document, one end of the return spring is connected to the end of the wedge-shaped passive block, and the other end is connected to the end of the movable cavity.

[0012] As an alternative solution to the technical solution of this utility model document, the thrust structure includes a pressing screw threadedly penetrating and connected to the end of the socket end, and an arc-shaped end is provided at the end of the pressing screw.

[0013] As an alternative solution to the technical solution of this utility model document, a flat washer and a spring washer are respectively sleeved on the outer circumference of the pressing screw.

[0014] As an alternative solution to the technical solution of this utility model document, one end of the pressing screw close to the arc-shaped end extends into the interior of the movable cavity.

[0015] Compared with the prior art, this utility model has the following technical effects or advantages:

[0016] 1. After the spigot is inserted into the socket end of this utility model, the gap between the spigot and the socket end is sealed by the sealing ring, and then the pressing screw is tightened. When the arc-shaped end contacts the inclined plane of the wedge-shaped passive block, under the action of the continuously screwed-in pressing screw, the arc-shaped end continuously pushes the clamping cylindrical shaft towards the direction of the limiting ring groove through the inclined plane of the wedge-shaped passive block. When the clamping cylindrical shaft is clamped into the interior of the limiting ring groove, the anti-loosening treatment of the spigot inserted into the socket end is realized. In this way, even if the interface part between the ductile iron pipes is at the bending part of the whole pipeline, the situation of loosening or even falling off between the spigot and the socket end can be effectively avoided, ensuring the firmness of the installation of the interface part of the ductile iron pipes.

[0017] 2. After the end of the clamping cylindrical shaft is clamped into the interior of the limiting ring groove, the spigot can still deflect inside the socket end, facilitating the deflection of the ductile iron pipe according to the design route during the laying and installation process. In this way, while this utility model realizes the anti-loosening treatment of the interface part of the ductile iron pipe, it does not affect the normal laying operation of the ductile iron pipeline.

[0018] 3. Through the marking line on the socket, it is not only convenient for construction workers to judge whether the distance that the socket extends into the inside of the socket is up to standard, but also when the end of the marking line is flush with the open end of the socket, the end of the clamping limit cylindrical shaft aligns with the limit ring groove, which is convenient for construction workers to use tools to tighten the pressure screw while clamping the end of the clamping limit cylindrical shaft into the inside of the limit ring groove, thus bringing convenience to the laying operation of the ductile iron pipeline.

[0019] 4. After tightening the pressure screw with tools such as a wrench, the pre-tightening force of the pressure screw is increased through the spring washer to achieve the anti-loosening treatment of the pressure screw, so that the pressure screw is difficult to loosen even under the impact vibration of the flowing fluid in the ductile iron pipe, further improving the connection firmness of the interface part of the ductile iron pipe. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0021] Figure 2 It is a schematic sectional view of the socket in the present utility model.

[0022] Figure 3 For the present utility model Figure 2 A partial enlarged schematic view of part A.

[0023] Explanation of the reference numerals in the drawings: 1, socket; 3, marking line; 4, socket; 5, pressure screw; 6, sealing ring; 7, limit ring groove; 8, wedge-shaped passive block; 9, clamping limit cylindrical shaft; 10, return spring; 11, flat washer; 12, spring washer; 13, arc end. Detailed Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. The following further describes the present utility model in detail in conjunction with the specification drawings.

[0025] Refer to Figures 1 to 3, an embodiment of the present utility model provides an anti - detachment interface structure for ductile iron pipes, which includes a socket 4 of the ductile iron pipe and a spigot 1 of the ductile iron pipe. The spigot 1 is inserted into the inside of the socket 4; there is an active cavity inside the wall thickness of the socket 4; a wedge - shaped passive block 8 is arranged in the active cavity. A limit cylinder shaft 9 is connected to the wedge - shaped passive block 8. A return spring 10 is sleeved on the outer periphery of the limit cylinder shaft 9. The bottom end of the limit cylinder shaft 9 penetrates through the side wall of the inner cavity of the socket 4 and extends into the inner cavity of the socket 4; a limit ring groove 7 for the end of the limit cylinder shaft 9 to snap into is provided in a ring shape on the side wall of the spigot 1. A thrust structure is provided at the position corresponding to the end of the socket 4 and the active cavity.

[0026] A sealing groove is provided in a ring shape on the side wall of the inner cavity of the socket 4, and a sealing ring 6 is arranged in the sealing groove. One end of the return spring 10 is connected to the end of the wedge - shaped passive block 8, and the other end is connected to the end of the active cavity.

[0027] Refer to Figure 2 and Figure 3 , an embodiment of the present utility model provides an anti - detachment interface structure for ductile iron pipes. The thrust structure includes a pressing screw 5 threadedly connected through the end of the socket 4, and an arc - shaped end 13 is provided at the end of the pressing screw 5.

[0028] One end of the pressing screw 5 close to the arc - shaped end 13 extends into the inside of the active cavity. After the spigot 1 is inserted into the socket 4, the gap between the spigot 1 and the socket 4 is sealed by the sealing ring 6, and then the pressing screw 5 is tightened;

[0029] When the arc - shaped end 13 contacts the inclined plane of the wedge - shaped passive block 8, under the action of the continuously screwed - in pressing screw 5, the arc - shaped end 13 continuously pushes the limit cylinder shaft 9 towards the direction of the limit ring groove 7 through the inclined plane of the wedge - shaped passive block 8. When the limit cylinder shaft 9 is snapped into the inside of the limit ring groove 7, the anti - detachment treatment of the spigot 1 inserted into the socket 4 is realized. In this way, even if the interface part between ductile iron pipes is at the bending part of the whole pipeline, the loosening or even falling off between the spigot and the socket can be effectively avoided.

[0030] When the end of the limit cylinder shaft 9 is snapped into the inside of the limit ring groove 7, the spigot 1 can still deflect inside the socket 4, which is convenient for the ductile iron pipe to deflect according to the design route during the laying and installation process. In this way, while the present utility model realizes the anti - detachment treatment of the interface part of the ductile iron pipe, it does not affect the normal laying operation of the ductile iron pipeline.

[0031] Refer to Figure 1 and Figure 2, a marking line 3 is also marked on the outer wall of the socket 1. Through the marking line 3 on the socket 1, it is not only convenient for construction workers to judge whether the distance that the socket 1 extends into the socket 4 is up to the standard, but when the end of the marking line 3 is flush with the open end of the socket 4, the end of the clamping limit cylindrical shaft 9 is aligned with the limit ring groove 7, which is convenient for construction workers to tighten the pressure screw 5 with tools and at the same time clamp the end of the clamping limit cylindrical shaft 9 into the limit ring groove 7.

[0032] Refer to Figure 3 , an anti-disconnection interface structure of a ductile iron pipe is provided in an embodiment of the present utility model. A flat washer 11 and a spring washer 12 are respectively sleeved on the outer periphery of the pressure screw 5. After the pressure screw 5 is tightened by tools such as a wrench, the pre-tightening force of the pressure screw 5 is increased through the spring washer 12 to realize the anti-loosening treatment of the pressure screw 5, so that the pressure screw 5 is difficult to loosen even under the impact vibration of the flowing fluid in the ductile iron pipe, further improving the connection firmness of the interface part of the ductile iron pipe.

Claims

1. An anti - detachment interface structure for a ductile iron pipe, characterized in that: It includes the socket (4) of the ductile iron pipe and the spigot (1) of the ductile iron pipe, and the spigot (1) is inserted into the socket (4). There is an active cavity inside the wall thickness of the socket (4). A wedge-shaped passive block (8) is arranged in the active cavity. A clamping limit cylindrical shaft (9) is connected to the wedge-shaped passive block (8). A return spring (10) is sleeved on the outer periphery of the clamping limit cylindrical shaft (9). The bottom end of the clamping limit cylindrical shaft (9) penetrates the side wall of the inner cavity of the socket (4) and extends into the inner cavity of the socket (4). A limit ring groove (7) is provided in a ring shape on the side wall of the spigot (1) for the end of the clamping limit cylindrical shaft (9) to be snapped into. A thrust structure is provided at the position corresponding to the end of the socket (4) and the active cavity.

2. The anti-disconnection interface structure of the ductile iron pipe according to claim 1, characterized in that: A sealing groove is provided in a ring shape on the side wall of the inner cavity of the socket (4), and a sealing ring (6) is arranged in the sealing groove.

3. The anti - detachment joint structure of the ductile iron pipe according to claim 1, characterized in that: A marking line (3) is also marked on the outer wall of the spigot (1).

4. The anti - detachment interface structure of the ductile iron pipe according to claim 1, characterized in that: One end of the return spring (10) is connected to the end of the wedge-shaped passive block (8), and the other end is connected to the end of the active cavity.

5. The anti - detachment interface structure of the ductile iron pipe according to claim 1, characterized in that: The thrust structure includes a pressing screw (5) threadedly connected through the end of the socket (4). An arc-shaped end (13) is provided at the end of the pressing screw (5).

6. The anti-disconnection interface structure of the ductile iron pipe according to claim 5, characterized in that: A flat washer (11) and a spring washer (12) are respectively sleeved on the outer periphery of the pressing screw (5).

7. The anti - detachment joint structure of the ductile iron pipe according to claim 5, characterized in that: One end of the pressing screw (5) close to the arc-shaped end (13) extends into the active cavity.

Images