Socket and spigot joint type pipeline connector

Abstract

The utility model relates to the technical field of nodular cast iron pipes, in particular to a socket type pipeline connector which comprises a socket, a spigot and a sealing piece, the socket comprises an annular sealing groove, an annular limiting part and a deflection groove which are coaxial, the annular limiting part separates the annular sealing groove and a conical groove, an annular retaining groove is formed in the annular sealing groove, and the deflection groove is formed in the spigot. An annular containing groove is formed by the distance between the annular retaining groove and the annular limiting part. The maximum-diameter port of the conical groove is connected with the annular limiting part; the inner diameter of the annular limiting part is smaller than the maximum inner diameter of the conical groove; the sealing piece comprises a hard rubber ring and a soft rubber ring, the outer ring of the hard rubber ring is arranged in the annular retaining groove, the outer ring of the soft rubber ring is tightly attached to the annular containing groove, the inner diameter of the hard rubber ring and the inner diameter of the soft rubber ring are smaller than the inner diameter of the annular limiting part, and the outer wall of the inserting opening is attached to the inner ring of the soft rubber ring in a sealed mode. Under the condition that the insertion depth of an insertion opening of an existing socket and spigot type pipeline connector into a deflection groove is the same, the deflection angle of the insertion opening in the deflection groove can be effectively increased.

Description

Technical Field

[0001] The utility model relates to the technical field of ductile iron pipes, and particularly relates to a socket-and-spigot type pipeline joint for ductile iron pipes. Background Art

[0002] At present, the common joint of cast pipes is a socket-and-slide type T-shaped joint. During installation, the spigot of the cast pipe is inserted into the socket of another cast pipe, and a sealing rubber ring is used for sealing connection in the middle. Among them, the socket-and-slide type T-shaped joint has the characteristics of simple structure, convenient installation, good sealing performance, etc., and can adapt to a certain foundation deformation, has a certain seismic resistance, and at the same time uses its deflection angle to realize the long-distance turning of the pipeline.

[0003] For example, a socket-reinforced steel pipe and its manufacturing method disclosed in Patent Publication No. CN110005885A have a certain deflection angle when the socket is connected to the spigot, which can effectively resist the joint cracking and deformation caused by stress concentration at the socket part after pipeline installation, and improve the anti-geological settlement ability of the steel pipe.

[0004] However, in the socket-reinforced steel pipe and its manufacturing method disclosed above, the minimum inner diameter port of its deflection groove (referring to the groove at one end of the annular groove facing away from the annular protruding structure) is connected to the annular groove, and the maximum inner diameter port of the deflection groove is far from the annular groove. Therefore, the spigot inserted into the deflection groove can only deflect at a small angle in the socket, thereby reducing the anti-geological settlement ability of the steel pipe. Summary of the Utility Model

[0005] One of the main purposes of the present utility model is to provide a socket-and-spigot type pipeline joint. When the insertion depth of the spigot into the deflection groove is the same as that of the existing socket-and-spigot type pipeline joint, the deflection angle of the spigot in the deflection groove can be effectively increased, thereby increasing the deflection angle of the spigot in the socket, and at the same time, the sealing performance between the socket and the spigot is not affected.

[0006] To achieve the above object, the utility model provides a socket-and-spigot pipe joint, which includes a socket, a spigot and a seal. The socket includes an annular sealing groove, an annular limiting portion and a deflection groove. The annular sealing groove, the annular limiting portion and the deflection groove are coaxial. The annular sealing groove is separated from the deflection groove by the annular limiting portion. An annular anti-retreat groove coaxial with it is formed in the annular sealing groove. The distance between the annular anti-retreat groove and the annular limiting portion forms an annular accommodating groove. The deflection groove is a tapered groove, and the maximum-diameter port of the tapered groove is connected to the annular limiting portion. The inner diameter of the annular limiting portion is smaller than the maximum inner diameter of the tapered groove and larger than the minimum inner diameter of the tapered groove. The seal includes a hard rubber ring and a soft rubber ring which are integrally connected and coaxial. The outer ring of the hard rubber ring is embedded in the annular anti-retreat groove, and the outer ring of the soft rubber ring is closely attached to the inner wall of the annular accommodating groove. The inner diameters of the hard rubber ring and the soft rubber ring are smaller than the inner diameter of the annular limiting portion. The spigot passes through the inner rings of the hard rubber ring and the soft rubber ring and enters the deflection groove. The outer wall of the spigot is hermetically attached to the inner ring of the hard rubber ring, and the outer wall of the spigot is always hermetically attached to the inner ring of the soft rubber ring.

[0007] Further, the socket further includes an annular limiting wall. The annular anti-retreat groove is located between the annular limiting wall and the annular accommodating groove. The inner diameter of the annular limiting wall is larger than the inner diameters of the hard rubber ring and the soft rubber ring, and the inner diameter of the annular limiting wall is smaller than the inner diameter of the annular accommodating groove. The annular limiting wall is used to prevent the hard rubber ring from detaching from the socket.

[0008] Further, the distance between the end face of the end of the spigot located in the deflection groove and the end face of the minimum inner diameter port of the tapered groove is set as L1. A first annular groove coaxial with it is formed in the inner ring of the annular limiting wall. The distance between the first annular groove and the end face of the minimum inner diameter port of the tapered groove is set as L2, and L2 - L1 = L3. A second annular groove is formed on the outer wall of the spigot. The distance between the second annular groove and the end face of the end of the spigot located in the deflection groove is equal to L3. A first sealing ring is embedded in the second annular groove, and the first sealing ring is also embedded in the first annular groove.

[0009] Further, a third annular groove coaxial with it is formed on the spigot. The third annular groove is located between the second annular groove and the end of the spigot located in the deflection groove, and the third annular groove is located inside the annular limiting wall. A second sealing ring hermetically attached to the annular limiting wall is embedded in the third annular groove.

[0010] Further, the wall thicknesses of the annular accommodating groove, the annular anti-retreat groove and the tapered groove are equal.

[0011] Further, the end face of the soft rubber ring facing away from the hard rubber ring is configured as a lip-shaped structure.

[0012] Furthermore, the inner diameter of the hard rubber ring is greater than that of the soft rubber ring.

[0013] Furthermore, a first guiding angle is formed at one end of the annular limiting wall facing away from the annular anti-reverse groove, and a second guiding angle is provided at the end of the socket located in the deflection groove. The first guiding angle is used for sliding cooperation with the second guiding angle to guide the socket into the socket.

[0014] Furthermore, a plurality of anchoring members are embedded inside the hard rubber ring. Each anchoring member includes an anchoring member body integrally connected with a plurality of meshing teeth, and the plurality of meshing teeth on each anchoring member body are used to bite the outer wall of the socket.

[0015] Furthermore, the vertical distance between each meshing tooth on the anchoring member body and the center point of the hard rubber ring gradually increases along the axial direction in which the socket is inserted into the socket.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] When the socket and spigot type pipe joint of the present utility model is in use, the hard rubber ring mainly plays a role in support and anti-disconnection, and the soft rubber ring mainly plays a role in compression sealing. When the depth of insertion of the socket into the deflection groove is the same as that of the existing socket and spigot type pipe joint, since the deflection groove of the present utility model is a tapered groove and the maximum diameter port of the tapered groove is connected to the annular limiting portion, the deflection angle of the socket in the deflection groove can be effectively increased, and the deflection angle of the socket in the socket can be increased; in addition, since the inner diameter of the annular limiting portion is smaller than the maximum inner diameter of the tapered groove and larger than the minimum inner diameter of the tapered groove, and the inner diameters of the hard rubber ring and the soft rubber ring are smaller than the inner diameter of the annular limiting portion, the annular limiting portion can prevent the socket from deflecting excessively in the socket. At the same time, during the deflection process, the annular limiting portion restricts the deflection of the socket so that the compression amount generated by the soft rubber ring is smaller than the distance between the annular limiting portion and the outer wall of the socket, avoiding the sealing performance of the soft rubber ring from failing due to excessive deflection of the socket and causing water leakage at the pipe joint. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the socket and spigot type pipe joint of the present utility model;

[0019] Figure 2 is Figure 1 an enlarged structural diagram at A in

[0020] Figure 3 is a schematic structural diagram of the socket of the embodiment of the present utility model;

[0021] Figure 4 is Figure 3Schematic diagram of the enlarged structure at B in the [device / component name];

[0022] Figure 5 This is a schematic diagram of the structure of the socket involved in the embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the socket involved in the embodiment of the present utility model in a deflected state within the socket;

[0024] Figure 7 This is a schematic diagram of the structure of the seal involved in the embodiment of the present utility model.

[0025] Reference numerals in each drawing:

[0026] 1. Socket; 10. Annular seal groove; 101. Annular accommodating groove; 102. Annular anti - retreat groove; 11. Annular limiting part; 12. Deflection groove; 13. Annular limiting wall; 130. First annular groove; 131. First sealing ring; 132. First guiding angle; 2. Spigot; 20. Second annular groove; 201. Second sealing ring; 202. Second guiding angle; 203. Third annular groove; 3. Seal; 30. Hard rubber ring; 31. Soft rubber ring; 310. Lip - shaped structure; 4. Anchor; 40. Anchor body; 41. Meshing teeth. Detailed implementation manners

[0027] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "width", "upper", "lower", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0031] Please refer to Figure 1 - Figure 7 , the present utility model provides a socket-and-spigot pipe joint, including a socket 1, a spigot 2 and a seal 3; the socket 1 includes an annular sealing groove 10, an annular limiting portion 11, a deflection groove 12 and an annular limiting wall 13, the annular sealing groove 10, the annular limiting portion 11 and the deflection groove 12 are coaxial, the annular sealing groove 10 is partitioned from the deflection groove 12 by the annular limiting portion 11, an annular anti-retreat groove 102 coaxial therewith is provided in the annular sealing groove 10, and an annular accommodating groove 101 is formed by the spacing between the annular anti-retreat groove 102 and the annular limiting portion 11.

[0032] The deflection groove 12 is a tapered groove, and the maximum-diameter port of the tapered groove is connected to the annular limiting portion 11; the inner diameter of the annular limiting portion 11 is smaller than the maximum inner diameter of the tapered groove and larger than the minimum inner diameter of the tapered groove. The annular anti-retreat groove 102 is located between the annular limiting wall 13 and the annular accommodating groove 101, and the inner diameter of the annular limiting wall 13 is larger than the inner diameters of the hard rubber ring 30 and the soft rubber ring 31, so as to avoid affecting the deflection of the spigot 2.

[0033] Certainly, the inner diameter of the annular limiting wall 13 is smaller than the inner diameter of the annular accommodating groove 101, and the annular limiting wall 13 is used to prevent the hard rubber ring 30 from detaching from the socket 1. It can be seen therefrom that the annular limiting wall 13 can further prevent the seal 3 from detaching from the socket 1 and prevent the seal 3 from shifting. In addition, the wall thicknesses of the annular accommodating groove 101, the annular anti-retreat groove 102 and the tapered groove are equal, so that the wall thickness of the socket 1 can be made uniform, and the situation that the socket 1 is prone to fracture due to uneven stress is avoided. A first guiding angle 132 is provided at the end of the annular limiting wall 13 facing away from the annular anti-retreat groove 102, and a second guiding angle 202 is provided at the end of the spigot 2 located in the deflection groove 12, and the first guiding angle 132 is used for sliding cooperation with the second guiding angle 202 to guide the spigot 2 into the socket 1. That is to say, during the process of inserting the spigot 2 into the socket 1, the second guiding angle 202 and the first guiding angle 132 are beneficial to the insertion of the spigot 2 into the socket 1.

[0034] Refer to Figure 1 、 Figure 2and Figure 7 The seal 3 includes a hard rubber ring 30 and a soft rubber ring 31. The hard rubber ring 30 and the soft rubber ring 31 are integrally connected and coaxially arranged. The outer ring of the hard rubber ring 30 is embedded in the annular anti-retreat groove 102, and the outer ring of the soft rubber ring 31 is closely attached to the inner wall of the annular accommodating groove 101. The inner diameters of the hard rubber ring 30 and the soft rubber ring 31 are smaller than the inner diameter of the annular limiting portion 11. The socket 2 passes through the inner rings of the hard rubber ring 30 and the soft rubber ring 31 and enters the deflection groove 12. Among them, based on the state where the socket 2 is connected to the socket 1, the outer wall of the socket 2 is attached to the inner ring of the hard rubber ring 30, and the outer wall of the socket 2 is always hermetically attached to the inner ring of the soft rubber ring 31. Moreover, the inner diameter of the hard rubber ring 30 is larger than the inner diameter of the soft rubber ring 31, so that the sealing performance between the soft rubber ring 31 and the socket 2 can be increased.

[0035] In addition, referring to Figure 2 , the end face of the soft rubber ring 31 facing away from the hard rubber ring 30 is constructed as a lip structure 310. Since the lip structure 310 expands outward after being subjected to water pressure, the soft rubber ring 31 presses the socket 2, improving the sealing performance between the soft rubber ring 31 and the socket 2.

[0036] A plurality of anchor members 4 are embedded inside the hard rubber ring 30. Each anchor member 4 includes an anchor member body 40 and a plurality of meshing teeth 41 that are integrally connected. The anchor member body 40 is embedded inside the hard rubber ring 30, and the plurality of meshing teeth 41 are integrally connected to the anchor member body 40. The plurality of meshing teeth 41 on each anchor member body 40 are used to bite the outer wall of the socket 2, so as to prevent the socket 2 from detaching from the socket 1. Specifically, the tips of the plurality of meshing teeth 41 on each anchor member body 40 are inclined towards the inside of the socket 1. After the socket 2 is inserted into the socket 1, the meshing teeth 41 will bite the outer wall of the socket 2, preventing the socket 2 from being pulled out, thus achieving the purpose of self-anchoring. Since geological subsidence may cause the socket 2 to deflect, in order to prevent the meshing teeth 41 on the anchor member body 40 from being unable to bite the outer wall of the socket 2 after the socket 2 deflects, for this reason, the vertical distance between each meshing tooth 41 on the anchor member body 40 and the center point of the hard rubber ring 30 gradually increases along the axial direction in which the socket 2 is inserted into the socket 1. In this way, after the socket 2 deflects, referring to Figure 6 , at least one meshing tooth 41 on the anchor member body 40 can still bite the outer wall of the socket 2, preventing the anchor member 4 from losing its anchoring function.

[0037] It should be noted that since the anchor member 4 is embedded inside the hard rubber ring 30, and the hard rubber ring 30 also has a certain elasticity, but the elastic performance of the hard rubber ring 30 is not as good as that of the soft rubber ring 31. Therefore, during the process of inserting the socket 2 into the socket 1, the meshing teeth 41 on the anchor member body 40 will not affect the insertion of the socket 2 into the socket 1.

[0038] During the installation process of the socket 1 and spigot 2 of the pipeline, the annular anti-retreat groove 102 acts on the hard rubber ring to prevent the seal 3 from falling off; the hard rubber ring 30 mainly plays a supporting and anti-detachment role, and the soft rubber ring mainly plays a compression sealing role; among them, the inner ring of the soft rubber ring cooperates with the spigot 2 to be squeezed to form a sealing effect.

[0039] When the socket and spigot type pipeline joint of the present utility model is in use, the hard rubber ring mainly plays a supporting and anti-detachment role, and the soft rubber ring mainly plays a compression sealing role. When the depth of the spigot 2 inserted into the deflection groove 12 is the same as that of the spigot 2 of the existing socket and spigot type pipeline joint inserted into the deflection groove 12, since the deflection groove 12 of the present utility model is a tapered groove, and the maximum diameter port of the tapered groove is connected to the annular limiting part 11, the deflection angle of the spigot 2 in the deflection groove 12 can be effectively increased, and the deflection angle of the spigot 2 in the socket 1 can be increased. In addition, since the inner diameter of the annular limiting part 11 is smaller than the maximum inner diameter of the tapered groove and larger than the minimum inner diameter of the tapered groove, and the inner diameters of the hard rubber ring 30 and the soft rubber ring 31 are smaller than the inner diameter of the annular limiting part 11, the annular limiting part 11 can prevent the spigot 2 from deflecting excessively in the socket 1. At the same time, during the deflection process, the annular limiting part 11 restricts the deflection of the spigot 2 so that the compression amount generated by the soft rubber ring 31 is smaller than the distance between the annular limiting part 11 and the outer wall of the spigot 2, avoiding the sealing performance of the soft rubber ring 31 from failing due to the excessive deflection of the spigot 2 and causing water leakage at the pipeline joint.

[0040] It should be noted that the sealing performance failure of the soft rubber ring 31 caused by the excessive deflection of the spigot 2 is mainly reflected as follows: Since the spigot 2 is deflecting, referring to Figure 6 , if the spigot 2 deflects counterclockwise, the extrusion amount of the top of the outer wall of the spigot 2 on the soft rubber ring will be greater than the extrusion amount of the bottom of the outer wall of the spigot 2 on the soft rubber ring. If the counterclockwise deflection angle of the spigot 2 is too large, the extrusion amount of the bottom of the outer wall of the spigot 2 on the soft rubber ring will be too small. In this way, it is very easy to cause water leakage between the bottom of the outer wall of the spigot 2 and the soft rubber ring, resulting in water leakage at the pipeline joint. Therefore, during the deflection of the spigot 2, by restricting the deflection of the spigot 2 by the annular limiting part 11 so that the compression amount generated by the soft rubber ring 31 is smaller than the distance between the annular limiting part 11 and the outer wall of the spigot 2, the sealing performance failure of the soft rubber ring 31 caused by the excessive deflection of the spigot 2 can be effectively avoided.

[0041] Since during the process of inserting the spigot 2 into the socket 1, the operator cannot predict the depth of the spigot 2 inserted into the socket 1. In this regard, referring to Figure 1 and Figure 4, in this embodiment, the distance between the end face of the end of the socket 2 located in the deflection groove 12 and the end face of the minimum inner diameter port of the conical groove is defined as L1. A first annular groove 130 coaxial with the annular limiting wall 13 is provided in the inner ring of the annular limiting wall 13. The distance between the first annular groove 130 and the end face of the minimum inner diameter port of the conical groove is defined as L2, and L2 - L1 = L3. Refer to Figure 5 , a second annular groove 20 is provided on the outer wall of the socket 2, and the distance between the second annular groove 20 and the end face of the end of the socket 2 located in the deflection groove 12 is equal to L3.

[0042] A first sealing ring 131 is embedded in the second annular groove 20, and the first sealing ring 131 is also embedded in the first annular groove 130. In this way, during the process of inserting the socket 2 into the socket 1, when the first sealing ring in the second annular groove 20 moves and is embedded in the first annular groove 130, at this time, the distance between the end face of the end of the socket 2 located in the deflection groove 12 and the end face of the minimum inner diameter port of the conical groove is exactly equal to the length of L1. So that when the operator inserts the socket 2 into the socket 1, only by moving the first sealing ring in the second annular groove 20 and embedding it in the first annular groove 130, it can be automatically determined that the insertion depth of the socket 2 into the socket 1 reaches the preset position; at the same time, when the first sealing ring moves and is embedded in the first annular groove 130, it gives the operator a sense of jerk, improving the insertion feel between the socket 2 and the socket 1.

[0043] In order to further improve the sealing performance between the socket 2 and the socket 1, a third annular groove 203 coaxial with it is also provided on the socket 2. The third annular groove 203 is located between the second annular groove 20 and the end of the socket 2 located in the deflection groove 12. Based on the state where the socket 2 is inserted into the socket 1, the third annular groove 203 is located inside the annular limiting wall 13, and a second sealing ring 201 that is hermetically fitted with the annular limiting wall 13 is embedded in the third annular groove 203. It can be seen from this that when the socket 2 is inserted into the socket 1, due to geological subsidence causing the socket 2 to deflect, even if the sealing performance of the soft rubber ring 31 fails, the second sealing ring 201 can serve as a second line of sealing defense to prevent water leakage at the pipe joint.

[0044] In addition, the first sealing ring 131 can also serve as a third line of sealing defense to prevent water leakage at the pipe joint.

[0045] To sum up, there are three lines of sealing defense against water leakage for the pipe joint of the present utility model. The soft rubber ring 31 is the first line of sealing defense, the second sealing ring 201 is the second line of sealing defense, and the first sealing ring 131 is the third line of sealing defense, thus greatly improving the water leakage performance of the pipe joint.

[0046] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present utility model.

Claims

1. A spigot-and-socket pipe joint, comprising a socket, a spigot and a seal, characterized in that: The socket includes an annular sealing groove, an annular limiting portion and a deflection groove, wherein the annular sealing groove, the annular limiting portion and the deflection groove are coaxial, the annular sealing groove and the deflection groove are separated by the annular limiting portion, an annular stop groove coaxial therewith is provided in the annular sealing groove, and the distance between the annular stop groove and the annular limiting portion forms an annular receiving groove; the deflection groove is a conical groove, and the maximum diameter end of the conical groove is connected to the annular limiting portion; the inner diameter of the annular limiting portion is smaller than the maximum inner diameter of the conical groove , which is larger than the minimum inner diameter of the tapered groove; the sealing component comprises an integrally connected and coaxial hard rubber ring and a soft rubber ring, the outer ring of the hard rubber ring is embedded in the annular stop groove, the outer ring of the soft rubber ring is tightly fitted with the inner wall of the annular receiving groove, the inner diameters of the hard rubber ring and the soft rubber ring are smaller than the inner diameter of the annular limiting portion, the socket is passed through the inner rings of the hard rubber ring and the soft rubber ring and enters the deflection groove, the outer wall of the socket is sealed with the inner ring of the hard rubber ring, and the outer wall of the socket is always sealed with the inner ring of the soft rubber ring.

2. The spigot-and-socket pipe joint according to claim 1, characterized in that: The socket also includes an annular limiting wall, the annular stop groove is located between the annular limiting wall and the annular receiving groove, the inner diameter of the annular limiting wall is larger than the inner diameters of the hard rubber ring and the soft rubber ring, the inner diameter of the annular limiting wall is smaller than the inner diameter of the annular receiving groove, and the annular limiting wall is used to prevent the hard rubber ring from detaching from the socket.

3. The spigot-and-socket pipe joint according to claim 2, characterized in that: The distance between the end face of the end of the socket located in the deflection groove and the end face of the minimum inner diameter port of the tapered groove is set to L1, the inner circle of the annular limiting wall is provided with a first annular groove coaxial therewith, the distance between the first annular groove and the end face of the minimum inner diameter port of the tapered groove is set to L2, L2-L1=L3, a second annular groove is provided on the outer wall of the socket, the distance between the second annular groove and the end face of the end of the socket located in the deflection groove is equal to L3, a first sealing ring is embedded in the second annular groove, and the first sealing ring is also embedded in the first annular groove.

4. The spigot-and-socket pipe joint according to claim 3, characterized in that: The socket is also provided with a third annular groove coaxial therewith, the third annular groove is located between the second annular groove and the end of the socket located in the deflection groove, and the third annular groove is located in the annular limiting wall, and the third annular groove is embedded with a second sealing ring that is sealingly fitted with the annular limiting wall.

5. The spigot-and-bell type pipe joint according to claim 1, characterized in that: The wall thicknesses of the annular receiving groove, the annular stop groove and the tapered groove are equal.

6. The spigot-and-bell type pipe joint according to claim 1, characterized in that: The end surface of the soft rubber ring facing away from the hard rubber ring is configured as a lip-shaped structure.

7. The spigot-and-bell type pipe joint according to claim 1, characterized in that: The inner diameter of the hard rubber ring is greater than the inner diameter of the soft rubber ring.

8. The spigot-and-bell type pipe joint according to claim 2, characterized in that: A first guide angle is provided at the end of the annular limit wall facing away from the annular stop groove, and a second guide angle is provided at the end of the socket located in the deflection groove. The first guide angle is used to slide with the second guide angle to guide the socket into the socket.

9. The spigot-and-bell type pipe joint according to claim 1, characterized in that: A plurality of anchoring members are embedded in the hard rubber ring, and each of the anchoring members comprises an anchoring member body and a plurality of meshing teeth which are integrally connected, and the plurality of meshing teeth on each of the anchoring member bodies are used for biting the outer wall of the socket.

10. The spigot-and-bell type pipe joint according to claim 9, characterized in that: The vertical distance between each meshing tooth on the anchor body and the center point of the hard rubber ring gradually increases along the axial direction of the insertion of the plug into the socket.

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