New socket-and-spigot compression fittings

Abstract

This utility model discloses a novel socket-fitting pipe fitting, belonging to the technical field of pipe connection devices. It includes a core sleeve and a shell, one end of which is connected to the outer wall of the core sleeve. The core sleeve includes a main body and a socket portion. The shell protrudes outwards, and the socket portion is recessed inwards, forming a double-layered socket between the shell and the socket portion. The remaining portion of the core sleeve is the main body. The end of the socket portion of the core sleeve is longer than the end of the shell. At least one groove is formed in the shell, and a transition piece matching the shape of the groove is provided within the groove; alternatively, a strip-shaped sealing ring is provided between the socket portion and the pipe. This utility model significantly improves the sealing performance, pull-out resistance, and vibration resistance after connection with the pipe, further enhancing the reliability of the connection and improving compatibility.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection devices, in particular to a novel socket-and-spigot compression fitting. Background Art

[0002] Existing socket-and-spigot compression fitting connection structures are as follows: Figure 1 As shown, it includes a core sleeve and an outer shell 1, one end of the outer shell 1 is connected to the outer wall of the core sleeve, and the core sleeve includes a main body 21 and a socket 22, wherein a double-layer structure of a socket 3 is formed between the outer shell 1 and the socket 22, and the rest of the core sleeve is the main body 21; when in use, the pipe 4 is inserted into the socket 3, and then a crimping tool is used to crimp and connect the pipe fitting to the pipe.

[0003] The current socket-and-spigot compression fitting structure has at least the following defects: ① One end of the socket portion 22 of the core sleeve is flush with the end of the outer shell 1, and the end of the socket portion 22 of the core sleeve is prone to collapse after compression, affecting the sealing effect; ② The sealing performance, pull-out resistance and seismic resistance of this structure are limited and need to be further improved; ③ Since only the outer shell protrudes outward relative to the socket portion, the compatibility when connected with the pipe is limited. Summary of the invention

[0004] The purpose of the utility model is to provide a novel socket-and-spigot compression fitting to solve the above-mentioned problem.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a new type of socket-and-spigot compression pipe fitting, comprising a core sleeve and an outer shell, one end of the outer shell is connected to the outer wall of the core sleeve, the core sleeve comprises a main body and a socket part, wherein, after the outer shell convexes outward and the socket part is concave inward, a double-layer socket is formed between the outer shell and the socket part, and the rest of the core sleeve is the main body, the end of the core sleeve socket part is longer than the end of the outer shell, at least one groove is opened in the outer shell, and a transition piece matching the shape of the groove is arranged in the groove, the transition piece can be pre-installed in the groove, and can also be installed at the construction site; or a strip sealing ring is arranged between the socket part and the pipe, that is, no groove is arranged, but a strip sealing ring is arranged between the core sleeve layer and the pipe.

[0006] The core sleeve extends outwards a certain distance relative to the shell, which enhances the strength and structural stability of the core sleeve layer end, improves the stress state of the end of the socket of the pipe core sleeve during pressing, and the grooves have a similar effect to reinforcement, which enhances the structural strength of the core sleeve; it avoids the problem of the core sleeve end collapsing after pressing, and the pressing type adopts mechanical pressing, preferably ring pressing and clamping. By setting the outer convex and inner concave structure of the socket, the compatibility is improved, and it is compatible with the nominal outer diameter parts in the market.

[0007] Optionally, a bell-mouth structure is provided at the end of the shell for guiding when connecting pipes.

[0008] As a preferred technical solution, at least one groove is also provided in the socket of the core sleeve, and a transition piece is arranged in the groove. By embedding grooves both inside and outside and arranging transition pieces in the grooves, the sealing performance and anti-pulling performance are further improved.

[0009] As a preferred technical solution, there is one groove, and when the novel socket-and-spigot compression fitting is crimped with the pipe, the width of the cavity of the crimping tool is L, and the one groove is set at any position within the range of L, preferably the one groove is set at the middle position of the cavity. The longitudinal section of the transition piece is of any shape, preferably circular, that is, similar to a clamped O-ring.

[0010] As a preferred technical solution, there is one groove, the transition piece is annular, and the longitudinal section is rectangular, that is, similar to an annular compression band sealing ring. When the embedded socket-type compression fitting is crimped with the pipe, the effective total width of the crimping tool is L1, and the width of the transition piece is less than, greater than or equal to L1. When it is greater than L1, it has a positioning function.

[0011] As a preferred technical solution, there are two grooves, the new socket-and-spigot compression fitting and the pipe are respectively crimped at the two grooves, the effective total width of the crimping tool is L1, the cavity width of the crimping tool is L, the two grooves are set at any position within the range of L1, preferably one of the grooves is set at the middle position of the cavity. The longitudinal section of the transition piece is of any shape, preferably circular, that is, similar to a clamped O-ring.

[0012] As a preferred technical solution, there are at least three grooves, the new socket-and-spigot compression fitting and the pipe are crimped on the three grooves, the effective total width of the crimping tool is L1, and the three grooves are arranged at any position of the width of L1. The longitudinal section of the transition piece is of any shape, preferably circular, that is, similar to a clamped O-ring.

[0013] As a further preferred technical solution, there are three grooves; when the new socket-fitted pipe fitting is crimped with the pipe, the cavity width of the crimping tool is L, and the three grooves are respectively arranged at the two end compression grooves and 1 / 2L of the crimping tool.

[0014] As a preferred technical solution, the shape of the transition piece matches the groove, and the cross-sectional shape is preferably circular or rectangular, that is, similar to a pressed O-ring or a ring-pressed belt-shaped sealing ring.

[0015] As a preferred technical solution, the material of the transition piece is a non-brittle material, preferably rubber, plastic or metal.

[0016] As a preferred technical solution, the main body is an elbow pipe, a straight pipe, a three-way pipe or a four-way pipe.

[0017] As a preferred technical solution, the main body of the core sleeve and the socket part are connected to form an integral body, or the main body of the core sleeve and the socket part are integrally formed, and are preferably made of stainless steel.

[0018] The core sleeve and the shell are preferably integrally formed, and of course, can also be connected by welding. In addition, the main body and the socket part of the core sleeve can also be integrally formed, and then assembled with the shell welding mode.

[0019] Compared with the prior art, the advantages of the utility model are: the advantages of the new socket-and-spigot compression fittings provided by the utility model include: the end of the socket part of the core sleeve extends out of the outer shell by a certain distance, thereby avoiding the problem of collapse of the end of the core sleeve after compression, and the sealing performance is improved by 30%; the installation is carried out by applying sealant, and a double sealing connection between the sealant and the transition piece is achieved, the sealing performance is improved by 100%, the vibration resistance is improved by 50%, and the reliability of the overall connection is improved by more than 20%; the use of three or more grooves greatly improves the sealing performance. According to tests, each groove can improve the sealing performance by about 20%; the convex outer and concave inner structure makes the pipe fittings compatible with the nominal outer diameter parts on the market. After connection, the other parts of the pipe fittings except the socket part (i.e. the main body and the connecting part) and the wall thickness center of the pipe are in a straight line, and the stability and tensile strength are further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a pipe fitting structure diagram of the prior art of the utility model;

[0021] Figure 2 This is a structural diagram of Embodiment 1 of the present utility model;

[0022] Figure 3 This is a connection diagram of Embodiment 1 of the present utility model;

[0023] Figure 4 This is a connection diagram of Embodiment 2 of the present utility model;

[0024] Figure 5 This is a connection diagram of Embodiment 3 of the present utility model;

[0025] Figure 6 This is a connection diagram of Embodiment 4 of the present utility model;

[0026] Figure 7 This is a structural diagram of Embodiment 5 of the present utility model;

[0027] Figure 8 This is a structural diagram of Embodiment 6 of the present utility model;

[0028] Fig. 9 This is a structural diagram of Embodiment 7 of the present utility model;

[0029] Fig.10 This is a structural diagram of Embodiment 8 of the present utility model;

[0030] Fig.11 This is a structural diagram of Embodiment 9 of the present utility model;

[0031] Fig.12 This is a structural diagram of Embodiment 10 of the present utility model;

[0032] Fig.13 This is a structural diagram of Embodiment 11 of the present utility model;

[0033] Fig.14 This is a structural diagram of embodiment 12 of the utility model.

[0034] In the figure: 1, shell; 21, main body; 22, socket; 3, socket; 4, pipe; 5, groove; 6, transition piece; 7, inner gap; 8, outer gap; 9, crimping tool; 91, left crimping groove; 92, cavity; 93, right crimping groove; 10, strip sealing ring. DETAILED DESCRIPTION

[0035] The utility model will be further described below in conjunction with the accompanying drawings.

[0036] Embodiment 1:

[0037] See also Figure 2 A novel socket-and-spigot compression fitting comprises a core sleeve and a shell 1, one end of the shell 1 is connected to the outer wall of the core sleeve, the core sleeve comprises a main body 21 and a socket 22, wherein, when the shell 1 is convex outward and the socket 22 is concave inward, a double-layer socket is formed between the shell 1 and the socket 22, the rest of the core sleeve is the main body 21, the end of the core sleeve socket 22 is longer than the end of the shell 1, that is, the end face of the core sleeve socket 22 extends outwardly by a certain distance relative to the end face of the shell 1, and in this embodiment, a groove 5 is opened on the inner side of the shell 1, and a transition piece 6 is arranged in the groove 5, such as Figure 3 As shown, when the novel socket-type compression fitting is crimped with the pipe 4, the effective total width of the crimping tool 9 is L1, the two ends of the crimping tool 9 are respectively a left compression groove 91 and a right compression groove 93, the middle part is a cavity 92, a depression is arranged at the middle position of the cavity 92, and the width of the cavity is L, the groove 5 can be at any position within the range of L1 (including the cavity 92 and the compression groove), and in this embodiment, it is preferred that one groove 5 is arranged at the middle position of the cavity 92, that is, corresponding to the depression; after the pipe 4 is inserted into the socket 3, an inner gap 7 is formed between the pipe 4 and the socket part 22 of the core sleeve, and an outer gap 8 is formed between the pipe 4 and the shell 1;

[0038] When connecting, you can inject sealant into the inner side of the socket before inserting the pipe (the preferred injection position is the inner side of the transition piece close to the bottom of the socket), and then complete the connection by pressing. The sealant also plays a sealing role, forming a double sealing effect of sealant sealing and transition piece sealing, which greatly improves the sealing performance and connection performance. You can also apply sealant on the inner and outer surfaces of the pipe before inserting the pipe into the socket, then insert the pipe with sealant into the socket, and then complete the connection by pressing.

[0039] Example 2

[0040] See also Figure 4 Compared with Example 1, this embodiment has two grooves 5, and the new socket-fitted pipe fitting and the pipe 4 are crimped on the two grooves 5 respectively. The width of the cavity 92 of the crimping tool 9 is L, and the two grooves 5 are respectively arranged at the middle position of each cavity 92. The rest is the same as Example 1.

[0041] Example 3

[0042] See also Figure 5 Compared with Example 1, the present embodiment has three grooves 5. When the novel socket-type compression fitting is crimped with the pipe 4, the width of the cavity of the crimping tool is L. The three grooves 3 are respectively arranged at the two end grooves (i.e., the left groove 91 and the right groove 93) and 1 / 2L of the crimping tool 9. The rest is the same as Example 1, i.e., the transition piece 5 can be located at any position on the core sleeve layer relative to the crimping tool, at a position corresponding to the range of the cavity 92 of the crimping tool 9, or at a position corresponding to the two end grooves.

[0043] Example 4

[0044] See also Figure 6 Compared with Example 1, this embodiment is provided with a groove 3, and the groove 3 is arranged at a position corresponding to the right pressing groove 93 of the crimping tool 9, and the rest is the same as Example 1.

[0045] Example 5

[0046] See also Figure 7 Compared with Example 1, the main body 21 of this embodiment is a bent pipe, and a double-layer socket-and-spigot pressing structure is provided at both ends of the core sleeve. The two shells 1 are connected to each other as a whole. The pipe fitting is preferably integrally formed. Of course, it can also be connected by welding or the like.

[0047] Example 6

[0048] See also Figure 8Compared with Example 5, the main body 21 of this embodiment is a curved pipe of another shape, and a double-layer socket-and-spigot pressing structure is provided at both ends of the core sleeve. The pipe fitting is preferably integrally formed, and of course, it can also be connected by welding or the like.

[0049] Example 7

[0050] See also Fig. 9 Compared with Example 5, the present embodiment has two housings 1 which are not connected to each other, and the rest is the same as Example 5.

[0051] Example 8

[0052] See also Fig.10 Compared with Example 6, the present embodiment has two housings 1 which are not connected to each other, and the rest is the same as Example 5.

[0053] Example 9

[0054] See also Fig.11 Compared with Example 5, this embodiment has two core sleeves that are not connected to each other, and the rest is the same as Example 5.

[0055] Example 10

[0056] See also Fig.12 Compared with Example 6, this embodiment has two core sleeves that are not connected to each other, and the rest is the same as Example 6.

[0057] Embodiment 11

[0058] Compared with Example 1, this embodiment Fig.13 As shown, the transition piece 6 is annular and has a rectangular longitudinal section, similar to an annular compression band seal ring. When the embedded socket-type compression fitting is crimped with the pipe, the effective total width of the crimping tool is L1. The width of the transition piece 6 is less than, greater than or equal to L1. When it is greater than L1, it has a positioning function. The maximum width of the transition piece 6 can reach Fig.12 The width of L2 is the total length of the socket portion 22; and the cavity portion of the crimping tool 9 of this embodiment has no arc-shaped depression and is straight.

[0059] Example 12

[0060] Compared with Example 11, this embodiment Fig.14 As shown, no groove is provided, but a strip-shaped sealing ring 10 is provided between the socket 22 and the pipe 4, and the rest is the same as Example 11.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of socket-and-spigot compression fitting, characterized in that: It includes a core sleeve and an outer shell, one end of the outer shell is connected to the outer wall of the core sleeve, and the core sleeve includes a main body and a socket part, wherein when the outer shell is convex outward and the socket part is concave inward, a double-layer socket is formed between the outer shell and the socket part, and the rest of the core sleeve is the main body, the end of the core sleeve socket part is longer than the end of the outer shell, at least one groove is opened in the outer shell, and a transition piece matching the shape of the groove is arranged in the groove.

2. The new socket-and-spigot compression fitting according to claim 1 is characterized in that: At least one groove is also formed in the socket portion of the core sleeve, and a transition piece is arranged in the groove.

3. The new socket-and-spigot compression fitting according to claim 1 is characterized in that: There is one groove. When the socket-and-spigot compression fitting is crimped with the pipe, the cavity width of the crimping tool is L, and the one groove is set at any position within the range of L.

4. The new socket-and-spigot compression fitting according to claim 3 is characterized in that: The one groove is arranged at the middle position of the cavity.

5. The new socket-and-spigot compression fitting according to claim 1 is characterized in that: There is one groove, the transition piece is annular, and its longitudinal section is rectangular. When the novel socket-and-spigot compression fitting is crimped with the pipe, the effective total width of the crimping tool is L1, and the width of the transition piece is less than, greater than or equal to L1.

6. The new socket-and-spigot compression fitting according to claim 1 is characterized in that: There are two grooves, and the new socket-and-spigot compression fitting and the pipe are crimped on the two grooves respectively. The cavity width of the crimping tool is L, and the two grooves are set at any position within the range of L.

7. The new socket-and-spigot compression fitting according to claim 6 is characterized in that: One of the grooves is arranged at the middle position of the cavity.

8. The new socket-and-spigot compression fitting according to claim 1 is characterized in that: There are at least three grooves, and the novel socket-and-spigot compression fitting and the pipe are crimped on the three grooves. The effective total width of the crimping tool is L1, and the three grooves are arranged at any position of the width of L1.

9. The new socket-and-spigot compression fitting according to claim 8 is characterized in that: There are three grooves; when the novel socket-and-spigot compression fitting is crimped with a pipe, the cavity width of the crimping tool is L, and the three grooves are respectively arranged at the compression grooves at both ends of the crimping tool and at 1 / 2L.

10. The new socket-and-spigot compression fitting according to claim 1 or 2, characterized in that: The material of the transition piece is a non-brittle material.

11. The new socket-and-spigot compression fitting according to claim 10, characterized in that: The non-brittle material is rubber, plastic or metal.

12. The new socket-and-spigot compression fitting according to claim 1 or 2, characterized in that: The main body is an elbow pipe, a straight pipe, a three-way pipe or a four-way pipe.

13. The new socket-and-spigot compression fitting according to claim 1 or 2, characterized in that: The main body of the core sleeve and the socket part are connected to form a whole, or the main body of the core sleeve and the socket part are integrally formed.

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