Flexible interface structure of nodular cast iron pipe fitting

Abstract

The utility model discloses a flexible interface structure of a nodular cast iron pipe fitting, which is used for connecting a first pipe fitting and a second pipe fitting and comprises an outer pipe, a telescopic interlayer pipe and an inner pipe, the telescopic interlayer pipe is coaxially and fixedly attached to the outer peripheral surface of the inner pipe, and the outer pipe is coaxially and fixedly attached to the outer peripheral surface of the telescopic interlayer pipe; the two ends of the outer pipe and the inner pipe are longer than the telescopic interlayer pipe, so that socket ring grooves are formed in the two ends of the flexible connector structure. The end faces, inserted into the socket ring groove, of the first pipe fitting and the second pipe fitting abut against the telescopic interlayer pipe in an attached mode and are attached to the inner wall of the socket ring groove. A plurality of telescopic allowance holes are formed in the middle of the telescopic interlayer pipe; connecting discs are integrally formed at two ends of the outer pipe; the first pipe fitting and the second pipe fitting are connected with a pressing flange, and the pressing flange is fixedly connected with the connecting disc through a connecting bolt. Good flexibility and flexibility during flexible connection of the pipe fitting are guaranteed, sealing reliability and stability are effectively improved, and leakage is not prone to occurring.

Description

TECHNICAL FIELD

[0001] The utility model relates to cast iron pipe fitting technical field especially relates to a flexible interface structure of nodular cast iron pipe fitting. BACKGROUND

[0002] Flexible interface nodular cast iron pipe fitting is with nodular cast iron as raw material manufacturing, and the pipe fitting of flexible connection mode is used at the interface, and is widely applied in the field such as municipal water supply and drainage, industrial water supply and drainage. Compared with other pipe fitting connection modes, the nodular cast iron pipe fitting connected with flexible interface has excellent flexibility and elasticity, so that the pipeline can adapt to the slight settlement and vibration of the foundation, and the anti-seismic performance is superior.

[0003] The utility model discloses a kind of nodular cast iron pipe fittings flexible K-type interfaces, the spigot of a nodular cast iron pipe fitting is inserted into the socket of another nodular cast iron pipe fitting, sealing rubber ring is installed between the spigot and socket, compression land is provided on the spigot, and the boss of compression land is pressed on sealing rubber ring, socket is provided with connecting disc on end port, and the pressure plate of compression land is fixedly connected with the connecting disc of socket by bolt.

[0004] For the above prior art, the inventor considers that in the above flexible interface structure, in order to ensure the expansion performance of the flexible connection of the nodular cast iron pipe fitting, expansion gap exists between the socket and the spigot, and then the transmission medium in the pipe fitting is easy to flow into the gap between the socket and the spigot, and only a single sealing rubber ring between the socket and the spigot is used for sealing, so the sealing reliability is low, and the risk of medium leakage is large. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the utility model provides a flexible interface structure of nodular cast iron pipe fitting, which has good sealing effect and high sealing reliability while ensuring good flexibility and elasticity of the flexible connection of the pipe fitting, and is not easy to leak.

[0006] In order to achieve the above purpose, the utility model provides a flexible interface structure of nodular cast iron pipe fitting, which is used for connecting a first pipe fitting and a second pipe fitting, comprising an outer pipe, an expansion sandwich pipe and an inner pipe.

[0007] The flexible interface structure is characterized in that the telescopic sandwich pipe is coaxially and fixedly attached to the outer circumferential surface of the inner pipe, and the outer pipe is coaxially and fixedly attached to the outer circumferential surface of the telescopic sandwich pipe; the lengths of the two ends of the outer pipe and the inner pipe are greater than that of the telescopic sandwich pipe, so that the two ends of the flexible interface structure are formed with socket ring grooves for inserting the first pipe fitting and the second pipe fitting; the end surfaces of the first pipe fitting and the second pipe fitting inserted into the socket ring grooves are in abutting contact with the telescopic sandwich pipe and in abutting contact with the inner walls of the socket ring grooves; the telescopic sandwich pipe is made of rubber, and a plurality of telescopic allowance holes are formed in the middle part of the telescopic sandwich pipe; the two ends of the outer pipe are integrally formed with connecting discs; the outer circumferential surfaces of the one ends of the first pipe fitting and the second pipe fitting close to the outer pipe are fixedly connected with pressure lands, and the pressure lands are connected and fixed with the connecting discs through connecting bolts.

[0008] Further, a tapered ring groove is formed in the inner side of the end surface of the outer pipe, the inner diameter of the tapered ring groove increases in the direction away from the center of the outer pipe, a sealing tapered strip is arranged in the tapered ring groove, one side of the pressure land is fixedly connected with a boss, and the boss is in abutting contact with the sealing tapered strip.

[0009] Further, the inner circumferential surfaces of the one ends of the first pipe fitting and the second pipe fitting inserted into the socket ring grooves are provided with connecting grooves, the two ends of the inner pipe are inserted into the corresponding connecting grooves, and the inner diameter of the inner pipe is the same as the inner diameters of the first pipe fitting and the second pipe fitting.

[0010] Further, a plurality of sealing grooves are formed between the inner wall of the connecting groove and the outer wall of the inner pipe, and a sealing ring is arranged in the sealing groove.

[0011] Further, the end surfaces of the telescopic sandwich pipe are serrated sealing surfaces.

[0012] The utility model discloses a flexible interface structure of nodular cast iron pipe fitting has the advantages of the following:

[0013] The flexible interface structure of the nodular cast iron pipe fitting not only guarantees the good flexibility when connecting two pipe fittings, and the telescopic amount acts on the deformation of the telescopic sandwich pipe, and because the telescopic sandwich pipe adopts the rubber material and is in abutting contact with the end surfaces of the first pipe fitting and the second pipe fitting, also plays a sealing role, therefore guaranteeing the flexible connection flexibility of the pipe fitting, and having good sealing effect, and cooperating with the sealing tapered strip and the sealing ring, further improve the sealing performance of the flexible interface structure. DRAWINGS

[0014] Figure 1 It is the whole structure schematic diagram of the utility model.

[0015] Figure 2 It is the structure section view of the utility model.

[0016] Figure 3 It is Figure 2 The local enlarged view of A part in middle.

[0017] Figure 4It is the structural schematic view of the telescopic sandwich pipe in the utility model.

[0018] In the figure: 1, first pipe fitting; 11, connecting groove; 2, second pipe fitting; 3, outer pipe; 31, conical ring groove; 32, connecting disc; 33, connecting bolt; 34, sealing cone strip; 4, telescopic sandwich pipe; 41, telescopic allowance hole; 42, sawtooth sealing surface; 5, inner pipe; 51, sealing ring; 6, pressure land; 61, boss. DETAILED DESCRIPTION

[0019] The utility model will be further explained in detail in combination with the drawings. These drawings are all simplified schematic views, and only schematically show the basic structure of the utility model, so they only show the structure related to the utility model.

[0020] The utility model discloses a flexible interface structure of nodular cast iron pipe fitting.

[0021] Referring to Figures 1 to 3 A flexible interface structure of nodular cast iron pipe fitting is used for connecting first pipe fitting 1 and second pipe fitting 2, which comprises outer pipe 3, telescopic sandwich pipe 4 and inner pipe 5;Wherein, outer pipe 3 and inner pipe 5 are rigid pipes, and telescopic sandwich pipe 4 is made of rubber, so that telescopic sandwich pipe 4 can be telescopic.

[0022] Referring to Figures 1 to 3 Outer pipe 3, telescopic sandwich pipe 4 and inner pipe 5 are sequentially arranged from outside to inside, that is, telescopic sandwich pipe 4 is coaxially adhered and fixed to the outer circumferential surface of inner pipe 5, and outer pipe 3 is coaxially adhered and fixed to the outer circumferential surface of telescopic sandwich pipe 4;The length of both ends of outer pipe 3 and inner pipe 5 is greater than that of telescopic sandwich pipe 4, so that both ends of the flexible interface structure are formed with socket ring grooves for inserting first pipe fitting 1 and second pipe fitting 2;The end surface of first pipe fitting 1 and second pipe fitting 2 inserted into the socket ring groove is tightly adhered to telescopic sandwich pipe 4, and is adhered to the inner wall of the socket ring groove;The middle part of telescopic sandwich pipe 4 is provided with a plurality of telescopic allowance holes 41;A plurality of telescopic allowance holes 41 are uniformly distributed along the circumference of telescopic sandwich pipe 4. The inner circumferential surface of one end of first pipe fitting 1 and second pipe fitting 2 inserted into the socket ring groove is provided with connecting groove 11, and both ends of inner pipe 5 are inserted into corresponding connecting groove 11, and the inner diameter of inner pipe 5 is the same as that of first pipe fitting 1 and second pipe fitting 2, so as to ensure the smoothness of medium flow in the pipe fitting. The both ends of outer pipe 3 are integrally formed with connecting disc 32;The outer circumferential surface of one end of first pipe fitting 1 and second pipe fitting 2 close to outer pipe 3 is fixedly connected with pressure land 6, and pressure land 6 is connected and fixed with connecting disc 32 through connecting bolt 33.

[0023] Referring to Figures 2 to 4When the first pipe 1 and the second pipe 2 are connected through the flexible interface structure, the first pipe 1 and the second pipe 2 are inserted into the corresponding socket ring grooves, and the first pipe 1 and the second pipe 2 abut against the end surface of the stretchable sandwich pipe 4. The design not only guarantees good stretchability between the first pipe 1 and the second pipe 2, but also guarantees that the stretchability is applied to the deformation of the stretchable sandwich pipe 4. In addition, the stretchable sandwich pipe 4 is made of rubber and abuts against the end surface of the first pipe 1 and the second pipe 2, so as to play a sealing role. Therefore, while guaranteeing the stretchability of the flexible connection of the pipe, the flexible connection of the pipe has good sealing effect. Since the stretchable sandwich pipe 4 is located between the rigid outer pipe 3 and the rigid inner pipe 5, the stretchable allowance hole 41 is provided to provide a deformation space for the stretchable sandwich pipe 4.

[0024] With reference to Figure 2 and Figure 3 The inner side of the end surface of the outer pipe 3 is provided with a tapered ring groove 31, the inner diameter of the tapered ring groove 31 increases away from the center of the outer pipe 3, the tapered ring groove 31 is provided with a sealing tapered strip 34, the protrusion 61 of the compression spring 6 is fixed, and the protrusion 61 abuts against the sealing tapered strip 34. The protrusion 61 of the compression spring 6 abuts against the sealing tapered strip 34, so that the sealing tapered strip 34 is tightly inserted into the tapered ring groove 31, and the sealing property of the flexible interface structure is further improved.

[0025] In addition, a plurality of sealing grooves are provided between the inner wall of the connecting groove 11 and the outer wall of the inner pipe 5, and a sealing ring 51 is arranged in the sealing groove. The end surface of the stretchable sandwich pipe 4 is a zigzag sealing surface 42, that is, the outer contour of the end surface of the stretchable sandwich pipe 4 along the axial section is zigzag. When the first pipe 1 and the second pipe 2 abut against the end surface of the stretchable sandwich pipe 4, the design can effectively increase the sealing path, cooperate with the sealing ring 51, and further improve the sealing effect and sealing reliability of the flexible interface structure.

[0026] Based on the above ideal embodiments of the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A flexible joint structure for a ductile cast iron pipe fitting for connecting a first pipe fitting (1) and a second pipe fitting (2), characterized in that: The flexible interface structure comprises an outer tube (3), a telescopic sandwich tube (4) and an inner tube (5). The telescopic sandwich tube (4) is coaxially fixed to the outer circumferential surface of the inner tube (5), and the outer tube (3) is coaxially fixed to the outer circumferential surface of the telescopic sandwich tube (4). The lengths of the two ends of the outer tube (3) and the inner tube (5) are greater than that of the telescopic sandwich tube (4), so that the two ends of the flexible interface structure are formed with socket ring grooves for inserting the first pipe fitting (1) and the second pipe fitting (2). The end surfaces of the first pipe fitting (1) and the second pipe fitting (2) inserted into the socket ring grooves are abuttingly fixed to the telescopic sandwich tube (4) and abuttingly fixed to the inner wall of the socket ring groove. The telescopic sandwich tube (4) is made of rubber, and a plurality of telescopic allowance holes (41) are formed in the middle part of the telescopic sandwich tube (4). The outer tube (3) is integrally formed with a connecting disc (32) at the two ends. The first pipe fitting (1) and the second pipe fitting (2) are fixedly connected with a compression spring (6) on the outer circumferential surface of one end close to the outer tube (3), and the compression spring (6) is connected and fixed with the connecting disc (32) through a connecting bolt (33).

2. A flexible coupling for ductile iron pipe according to claim 1, wherein: A tapered ring groove (31) is formed in the inner side of the end surface of the outer tube (3), the inner diameter of the tapered ring groove (31) increases in the direction away from the center of the outer tube (3), a sealing tapered strip (34) is arranged in the tapered ring groove (31), one side of the compression spring (6) is fixedly connected with a boss (61), and the boss (61) abuts against the sealing tapered strip (34).

3. A flexible coupling for ductile iron pipe according to claim 2, wherein: The inner circumferential surface of one end of the socket ring groove into which the first pipe fitting (1) and the second pipe fitting (2) are inserted is provided with a connecting groove (11), the two ends of the inner tube (5) are inserted into the corresponding connecting grooves (11), and the inner diameter of the inner tube (5) is the same as that of the first pipe fitting (1) and the second pipe fitting (2).

4. A flexible coupling for ductile iron pipe according to claim 3, wherein: A plurality of sealing grooves are formed between the inner wall of the connecting groove (11) and the outer wall of the inner tube (5), and a sealing ring (51) is arranged in the sealing groove.

5. A flexible coupling for ductile iron pipe according to claim 4, wherein: The end surfaces of the telescopic sandwich tube (4) are sawtooth-shaped sealing surfaces (42).

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