Nodular cast iron pipe fitting with high sealing performance

Abstract

The utility model discloses a nodular cast iron pipe fitting with high sealing performance, which comprises two pipe fittings which are connected with each other, and a spigot end and a socket end are respectively formed at the connected ends of the two pipe fittings; a K-shaped connector structure is arranged between the spigot end and the socket end and comprises a pressing flange, a first rubber ring, a second rubber ring and a connecting bolt, the pressing flange is fixedly connected with the connecting disc through the connecting bolt, and one side of the pressing flange abuts against the side wall of the first rubber ring. The inner circumferential surface of the socket end protrudes outwards to form a convex ring part, and the convex ring part is located on one side of the connecting disc; the second rubber ring is positioned in a groove in the inner side of the convex ring part; the second rubber ring is sleeved on the peripheral surface of the socket end; a guide cone is integrally formed on the peripheral face of the inserting opening end, and the outer wall of the guide cone abuts against the inner side wall of the second rubber ring. Internal and external dual sealing is adopted, the sealing performance is good, the flexible connection is more stable, and pipe fittings are not prone to disengagement.

Description

TECHNICAL FIELD

[0001] The utility model relates to nodular cast iron pipe fitting technical field especially relates to a high sealing nodular cast iron pipe fitting. BACKGROUND

[0002] Nodular cast iron pipe fitting refers to the pipe formed by centrifugal nodular cast iron machine high speed centrifugal casting after using cast iron water adding spheroidizing agent.

[0003] Nodular cast iron pipe fitting is often needed to connect multiple pipes during use, and K type flexible interface is a commonly used pipe interface mode, which is simple in installation process, easy to operate and high in construction efficiency, such as the K type interface disclosed in the utility model with announcement number CN205118516U, mainly comprising pipe socket outer end flange, pressure land, spigot, bolt and special shaped rubber ring, the bolt is used to fasten the pressure land, the pressure land is in close contact with the rubber ring, so that the rubber ring is expanded to generate contact pressure and form a seal.

[0004] In view of the above prior art, the inventor considers that the existing K type flexible interface structure is simple, easy to operate and install, but its sealing function is only realized by extruding the rubber ring with the pressure land, and the sealing performance is relatively poor, and the sealing stability is also low during long-term conveying operation. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the utility model provides a high sealing nodular cast iron pipe fitting, which has good sealing performance and is more stable during flexible connection, and the pipe fittings are not easy to separate.

[0006] In order to achieve the above purpose, the utility model provides a high sealing nodular cast iron pipe fitting, which comprises two pipe fittings connected with each other, and the end connected with each other of the two pipe fittings forms a spigot end and a socket end respectively.

[0007] The inner peripheral surface of the socket end is outwardly convexly formed with a convex ring part, which is located on one side of the connecting disc; the second rubber ring is located in the groove on the inner side of the convex ring part; when the spigot end is inserted into the socket end, the second rubber ring is sleeved on the outer peripheral surface of the spigot end; the outer peripheral surface of the spigot end is integrally formed with a guide cone, the outer diameter of the guide cone decreases in the direction towards the socket end until the outer diameter of the guide cone is the same as the outer diameter of the spigot end; the outer wall of the guide cone abuts against the inner wall of the second rubber ring.

[0008] Further, the pipe body between the convex ring part and the connecting disc on the socket end is provided as a transition section, the inner diameter of the transition section is greater than the outer diameter of the spigot end, so that a connecting gap for the guide cone to pass through is left between the transition section and the spigot end.

[0009] Further, a retaining ring is arranged in the connecting gap, the retaining ring is sleeved on the outer side of the spigot end, one end of the retaining ring is fixedly connected with the first rubber ring, and the other end abuts against the end face of the guide cone.

[0010] Further, a connecting piece is fixed to the side of the retaining ring close to the first rubber ring, the connecting piece is inserted into the first rubber ring and fixedly connected with the first rubber ring.

[0011] Further, the cross section of the second rubber ring is in the shape of a trapezoid.

[0012] The utility model discloses a ball pipe fitting of high sealing performance, utilizes the pressure land and first rubber ring to realize outer layer sealing, utilizes guide cone and second rubber ring to realize inner layer sealing, and the sealing performance is good, and the long -term work sealing reliability is high.

[0013] The utility model discloses a ball pipe fitting of high sealing performance, utilizes the pressure land and first rubber ring to realize outer layer sealing, utilizes guide cone and second rubber ring to realize inner layer sealing, and the sealing performance is good, and the long -term work sealing reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the sectional view of the utility model.

[0015] Figure 2 It is Figure 1 The local enlarged view of A part in figure.

[0016] In the drawing: 1, spigot end;11, guide cone;2, socket end;21, connecting disc;211, sealing cone groove;22, convex ring part;23, transition section;231, connecting gap;3, K-shaped interface structure;31, pressure land;32, first rubber ring;33, second rubber ring;34, connecting bolt;35, retaining ring;36, connecting piece. DETAILED DESCRIPTION

[0017] The utility model will be described in further detail below with reference to the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, and thus only show the components related to the utility model.

[0018] The utility model discloses a high sealing nodular cast iron pipe fitting.

[0019] With reference to Figure 1 and Figure 2 A high sealing nodular cast iron pipe fitting, comprising two pipe fittings connected with each other, and a socket end 1 and a socket end 2 are formed at one end of the two pipe fittings connected with each other respectively; a K-shaped interface structure 3 is arranged between the socket end 1 and the socket end 2, the K-shaped interface structure 3 comprises a pressure ring 31, a first rubber ring 32, a second rubber ring 33 and a connecting bolt 34, and a connecting disc 21 is integrally formed at one end of the socket end 2 close to the socket end 1; a sealing taper groove 211 is formed on the inner circle of the connecting disc 21, and the first rubber ring 32 is located in the sealing taper groove 211; the pressure ring 31 is sleeved on the socket end 1, and the pressure ring 31 is connected and fixed with the connecting disc 21 through the connecting bolt 34, one side of the pressure ring 31 abuts against the side wall of the first rubber ring 32, so that the first rubber ring 32 is pressed and deformed to tightly adhere to the outer wall, and outer layer sealing is realized.

[0020] With reference to Figure 1 and Figure 2 The inner peripheral surface of the socket end 2 protrudes outward to form a convex ring part 22, and the convex ring part 22 is located on one side of the connecting disc 21; the second rubber ring 33 is located in the recess on the inner side of the convex ring part 22, and the cross-sectional shape of the second rubber ring 33 is trapezoidal; when the socket end 1 is inserted into the socket end 2, the second rubber ring 33 is sleeved on the outer peripheral surface of the socket end 1; a guide cone 11 is integrally formed on the outer peripheral surface of the socket end 1, and the outer diameter of the guide cone 11 decreases in the direction towards the socket end 2 until the outer diameter of the guide cone 11 is the same as the outer diameter of the socket end 1; the outer wall of the guide cone 11 abuts against the inner side wall of the second rubber ring 33. When the socket end 1 is inserted into the socket end 2, the guide cone 11 gradually penetrates into the inner side of the second rubber ring 33 to tightly abut against the second rubber ring 33, so that the second rubber ring 33 is pressed and deformed to tightly adhere to the outer wall, and inner layer sealing is realized.

[0021] With reference to Figure 1 and Figure 2 The pipe body between the convex ring part 22 and the connecting disc 21 on the socket end 2 is a transition section 23, and the inner diameter of the transition section 23 is greater than the outer diameter of the socket end 1, so that a connecting gap 231 is left between the transition section 23 and the socket end 1 for the guide cone 11 to pass through. The connecting gap 231 provides a space for the insertion of the guide cone 11 on the socket end 1, and facilitates the connection of the socket end 2 and the socket end 1.

[0022] With reference to Figure 1 and Figure 2, the connecting gap 231 is filled with a retaining ring 35 made of stainless steel, one end of the retaining ring 35 is fixedly connected with the first rubber ring 32, and the other end is abutted against the end face of the guide cone 11. When the connecting bolt 34 is used to connect the compression ring 31 and the connecting disc 21, the compression ring 31 extrudes and drives the first rubber ring 32 to move forward, and then the first rubber ring 32 can push the guide cone 11 to move forward through the retaining ring 35, and then the guide cone 11 can be fully inserted into the bottom surface of the second rubber ring 33, thereby guaranteeing the sealing effect of the second rubber ring 33 and improving the connection effect between the socket end 2 and the spigot end 1. In addition, the retaining ring 35 plays a limiting role on the guide cone 11, that is, the spigot end 1, thereby improving the connection stability between the spigot end 1 and the socket end 2. Compared with the existing method of relying only on the friction force between the rubber ring and the pipe wall to maintain the axial position of the two pipe fittings, the spigot end 1 is not easy to be pulled out of the socket part.

[0023] With reference to Figure 1 and Figure 2 , the side of the retaining ring 35 close to the first rubber ring 32 is fixedly connected with a connecting piece 36, the connecting piece 36 is inserted into the first rubber ring 32 and is adhesively fixed with the first rubber ring 32, and one end of the retaining ring 35 is embedded in the first rubber ring 32 through the connecting piece 36, thereby improving the connection and sealing property of the retaining ring 35 and the first rubber ring 32 and reducing additional gaps.

[0024] 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 must be determined according to the scope of the claims.

Claims

1. A high sealing ductile iron pipe fitting comprising two pipe fittings connected to each other, each of the two pipe fittings having a spigot end (1) and a socket end (2) formed at the end connected to each other; characterized in that: The K-shaped interface structure (3) is arranged between the socket end (1) and the bell end (2), and comprises a pressing bar (31), a first rubber ring (32), a second rubber ring (33) and a connecting bolt (34). The inner circumferential surface of the bell end (2) is outwardly protruded to form a convex ring part (22), and the convex ring part (22) is located on one side of the connecting disc (21); the second rubber ring (33) is located in the groove on the inner side of the convex ring part (22); when the socket end (1) is inserted into the bell end (2), the second rubber ring (33) is sleeved on the outer circumferential surface of the socket end (1); the outer circumferential surface of the socket end (1) is integrally formed with a guide cone (11), the outer diameter of the guide cone (11) decreases in the direction towards the bell end (2) until the same as the outer diameter of the socket end (1); the outer wall of the guide cone (11) abuts against the inner wall of the second rubber ring (33).

2. A high tightness ductile iron pipe fitting according to claim 1, characterized in that: The pipe body between the convex ring part (22) and the connecting disc (21) on the bell end (2) is a transition section (23), the inner diameter of the transition section (23) is greater than the outer diameter of the socket end (1), so that a connecting gap (231) is left between the transition section (23) and the socket end (1) for the guide cone (11) to pass through.

3. A high tightness ductile iron pipe fitting according to claim 2, characterized in that: A stop ring (35) is arranged in the connecting gap (231), the stop ring (35) is sleeved on the outside of the socket end (1), one end of the stop ring (35) is fixedly connected with the first rubber ring (32), and the other end abuts against the end face of the guide cone (11).

4. A high tightness ductile iron pipe fitting according to claim 3, characterized in that: The stop ring (35) is fixedly connected with a connecting piece (36) on the side close to the first rubber ring (32), the connecting piece (36) is inserted into the first rubber ring (32) and fixedly connected with the first rubber ring (32).

5. A high tightness ductile iron pipe fitting according to claim 4, characterized in that: The cross-sectional shape of the second rubber ring (33) is trapezoidal.

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