Adapter for converting corrugated pipe into PPR pipe

Abstract

The utility model discloses a corrugated pipe to PPR pipe conversion adapter which comprises a PPR pipe and a corrugated pipe, a locking nut is arranged at the end of the corrugated pipe, a clamping ring is arranged in the locking nut, the locking nut and the corrugated pipe are axially limited through the clamping ring, an adapter body is arranged at the end of the PPR pipe, the adapter body comprises a locking sleeve and a locking head, and the locking sleeve is sleeved with the locking head. The front end of the locking sleeve is fixedly connected with the PPR pipe, the rear end of the locking sleeve tightly wraps the outer wall of the front end of the locking head, an external thread section is arranged at the rear end of the locking head, and an internal thread section correspondingly matched with the external thread section is arranged on the inner wall of the locking nut. A PPR pipe joint and a corrugated pipe joint in the prior art are integrally designed into the adapter, and threaded connection is realized through the adapter and the locking nut at the front end of the corrugated pipe, so that only one threaded connection point is arranged at the joint of the PPR pipe and the corrugated pipe, the leakage risk at the joint is reduced, meanwhile, the number of used parts is small, and the cost is low. And the production cost is reduced, and the installation is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of bellows joints, and particularly relates to a bellows to PPR pipe adapter joint. Background Art

[0002] Stainless steel bellows has the characteristics of strong corrosion resistance, anti-settlement, anti-rat and insect bite, non-blocking pipe, etc. These characteristics make stainless steel bellows widely used in conveying fluid media. When in use, according to the installation requirements, stainless steel bellows often needs to be connected to PPR pipe, and the stainless steel bellows is connected to the PPR pipe through a joint. As shown in the attached Figure 1 figure, which is a sectional view of the mating connection between the PPR pipe 1' and the bellows 2' in the prior art. The PPR pipe joint 11' is fixedly connected to the PPR pipe 1'; a lock nut 21' is axially limited at the end of the bellows 2', the lock nut 21' is threadedly connected with a bellows joint 22', and the PPR pipe joint 11' is threadedly connected with the bellows joint 22'. In this way, there are two threaded connection points at the connection between the bellows 2' and the PPR pipe 1', increasing the risk of leakage at the connection. At the same time, the number of parts used is relatively large, the production cost is relatively high, and the installation is also inconvenient.

[0003] Therefore, it is necessary to improve the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a bellows to PPR pipe adapter joint aiming at the defects and deficiencies of the prior art. The PPR pipe joint and the bellows joint in the prior art are integrally designed as an adapter joint, so that there is only one threaded connection point at the connection between the PPR pipe and the bellows, reducing the leakage risk at the connection. At the same time, the number of parts used is also reduced, the production cost is reduced, and the installation is convenient.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A bellows to PPR pipe adapter joint includes a PPR pipe and a bellows. A lock nut is arranged at the end of the bellows. A snap ring is arranged inside the lock nut. The lock nut realizes axial limit with the bellows through the snap ring. A conversion joint is arranged at the end of the PPR pipe. The conversion joint includes a locking sleeve and a locking head. The front end of the locking sleeve is fixedly connected to the PPR pipe. The rear end of the locking sleeve tightly wraps the outer wall of the front end of the locking head. An external thread section is arranged at the rear end of the locking head. An internal thread section corresponding to and mating with the external thread section is arranged on the inner wall of the lock nut.

[0007] Furthermore, the locking sleeve is fixedly connected to the locking head by injection molding.

[0008] Further, a plurality of annular grooves are provided at the front end of the locking head, and annular protrusions adapted to the annular grooves one by one are formed on the inner wall of the locking sleeve.

[0009] Further, a limiting step for limiting the front end of the corrugated pipe is provided on the inner circumference of the locking head.

[0010] Further, the front end of the locking sleeve is fixedly connected to the PPR pipe by hot melt welding.

[0011] Further, a stepped portion is provided inside the locking nut, the snap ring abuts against the stepped portion, and the snap ring is clamped on the wave crest of the corrugated pipe.

[0012] Further, a sealing ring is also provided inside the locking nut, and the sealing ring abuts against the front end of the snap ring.

[0013] Further, the sealing ring is provided with a first inclined surface, and the locking head is provided with a second inclined surface adapted to the first inclined surface.

[0014] Further, a coating layer is provided on the outer circumference of the corrugated pipe, and an E-shaped sealing ring is provided between the locking nut and the coating layer.

[0015] Further, a positioning groove for installing the E-shaped sealing ring is provided on the inner wall of the locking nut.

[0016] After adopting the above structure, the beneficial effects of the present utility model are as follows: A corrugated pipe to PPR pipe conversion joint of the present utility model includes a PPR pipe and a corrugated pipe. A locking nut is provided at the end of the corrugated pipe, and a snap ring is provided inside the locking nut. The locking nut realizes axial limit with the corrugated pipe through the snap ring. A conversion joint is provided at the end of the PPR pipe. The conversion joint includes a locking sleeve and a locking head. The front end of the locking sleeve is fixedly connected to the PPR pipe, the rear end of the locking sleeve tightly wraps the outer wall of the front end of the locking head, an external thread section is provided at the rear end of the locking head, and an internal thread section corresponding to and cooperating with the external thread section is provided on the inner wall of the locking nut. It combines the PPR pipe joint and the corrugated pipe joint in the prior art into a conversion joint, and realizes threaded connection through the conversion joint and the locking nut at the front end of the corrugated pipe. In this way, there is only one threaded connection point at the connection between the PPR pipe and the corrugated pipe, reducing the leakage risk at the connection. At the same time, it reduces the number of parts used, reduces the production cost, and makes the installation more convenient. Description of the Drawings

[0017] To more clearly illustrate the specific embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a sectional view of the mating connection between a PPR pipe and a corrugated pipe in the prior art;

[0019] Figure 2 is a sectional view of the overall structure of the present utility model;

[0020] Figure 3 is of the present utility model Figure 2 enlarged schematic view at position A;

[0021] Figure 4 is an exploded sectional view of the adapter of the present utility model;

[0022] Figure 5 is a sectional view of the lock nut of the present utility model;

[0023] Figure 6 is a sectional view of the sealing ring of the present utility model.

[0024] Figures 1 to 6 The reference numerals in the figure are:

[0025] 1, PPR pipe; 2, corrugated pipe; 21, wave crest; 22, coating layer; 3, lock nut; 31, internal thread section; 32, step portion; 33, positioning groove; 4, snap ring; 5, adapter; 51, locking sleeve; 511, annular protrusion; 52, locking head; 521, external thread section; 522, annular groove; 523, limiting step; 524, second inclined surface; 6, sealing ring; 61, first inclined surface; 7, E-shaped sealing ring; 1’, PPR pipe; 11’, PPR pipe joint; 2’, corrugated pipe; 21’, lock nut; 22’, corrugated pipe joint. Specific Embodiments

[0026] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will give a detailed description of the specific embodiments of the present utility model in conjunction with the drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0027] In the description of the present utility model, it should be understood that if such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are 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, and thus should not be construed as a limitation to the present utility model.

[0028] In addition, if such terms as "first" and "second" appear, these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present utility model, unless otherwise clearly specified and limited, if such terms as "installation", "connection", "connection", "fixation", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. 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 limited, if there is a description such as a first feature being "above" or "below" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0031] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the present invention are only for the purpose of illustration and do not represent the only implementation.

[0032] It should be noted that without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0033] As Figures 1 to 6 shown, a bellows-to-PPR pipe adapter includes a PPR pipe 1 and a bellows 2. A locking nut 3 is provided at the end of the bellows 2. A snap ring 4 is provided inside the locking nut 3. The locking nut 3 realizes axial limit with the bellows 2 through the snap ring 4. A conversion joint 5 is provided at the end of the PPR pipe 1. The conversion joint 5 includes a locking sleeve 51 and a locking head 52. The front end of the locking sleeve 51 is fixedly connected to the PPR pipe 1. The rear end of the locking sleeve 51 tightly wraps around the outer wall of the front end of the locking head 52. An external thread section 521 is provided at the rear end of the locking head 52. An internal thread section 31 corresponding to and cooperating with the external thread section 521 is provided on the inner wall of the locking nut 3.

[0034] Based on the above embodiments, the present invention aims to provide a bellows-to-PPR pipe adapter, which includes a PPR pipe 1 and a bellows 2. A locking nut 3 is provided at the end of the bellows 2. A snap ring 4 is provided inside the locking nut 3. The locking nut 3 realizes axial limit with the bellows 2 through the snap ring 4. A conversion joint 5 is provided at the end of the PPR pipe 1. The conversion joint 5 includes a locking sleeve 51 and a locking head 52. The front end of the locking sleeve 51 is fixedly connected to the PPR pipe 1. The rear end of the locking sleeve 51 tightly wraps around the outer wall of the front end of the locking head 52. An external thread section 521 is provided at the rear end of the locking head 52. An internal thread section 31 corresponding to and cooperating with the external thread section 521 is provided on the inner wall of the locking nut 3. It combines the PPR pipe joint 11' and the bellows joint 22' in the prior art into a conversion joint 5, and realizes screw connection through the conversion joint 5 and the locking nut 3 at the front end of the bellows 2. In this way, there is only one threaded connection point at the connection between the PPR pipe 1 and the bellows 2, reducing the leakage risk at the connection. At the same time, it reduces the number of parts used, reduces the production cost, and makes the installation more convenient.

[0035] As another preferred solution of the present utility model, the locking sleeve 51 is fixedly connected to the locking head 52 by injection molding. A plurality of annular grooves 522 are provided at the front end of the locking head 52, and annular protrusions 511 adapted to the annular grooves 522 one by one are formed on the inner wall of the locking sleeve 51. In this embodiment, as Figure 4 shown, the fixed connection between the locking sleeve 51 and the locking head 52 is realized by injection molding, which can more conveniently and firmly connect the locking sleeve 51 and the locking head 52. A plurality of annular grooves 522 are provided at the front end of the locking head 52. In this way, when the locking sleeve 51 and the locking head 52 are injection-molded and connected, annular protrusions 511 corresponding to the annular grooves 522 will be formed on the inner wall of the locking sleeve 51. The annular grooves 522 and the annular protrusions 511 are engaged with each other, making it more difficult for the locking sleeve 51 and the locking head 52 to axially loosen.

[0036] As another preferred solution of the present utility model, a limiting step 523 for limiting the front end of the corrugated pipe 2 is provided on the inner circumference of the locking head 52. In this embodiment, as Figure 5 shown, under the action of the limiting step 523, it is possible to prevent the front end of the corrugated pipe 2 from passing through the front end of the locking head 52 due to excessive installation, thereby improving the stability of installing the corrugated pipe 2. At the same time, a hard sealing effect is formed between the inner peripheral side of the locking head 52 and the wave crest 21 of the corrugated pipe 2, further improving the sealing performance at the connection between the PPR pipe 1 and the corrugated pipe 2.

[0037] As another preferred solution of the present utility model, the front end of the locking sleeve 51 is fixedly connected to the PPR pipe 1 by hot melt welding. In this embodiment, the locking sleeve 51 and the PPR pipe 1 are connected by hot melt welding. By using the connection method of hot melt welding, the locking sleeve 51 and the PPR pipe 1 are melted into one body, there is no connection seam between the two and they cannot be disassembled, and the leak-proof sealing effect is good.

[0038] As another preferred solution of the present utility model, a stepped portion 32 is provided inside the locking nut 3, the snap ring 4 abuts against the stepped portion 32, and the snap ring 4 is clamped on the wave crest 21 of the corrugated pipe 2. In this embodiment, as Figure 3 shown, during installation, the snap ring 4 is clamped on the wave crest 21 of the corrugated pipe 2, and the rear end of the snap ring 4 abuts against the stepped portion 32, thereby realizing the axial limit of the corrugated pipe 2 relative to the locking nut 3 through the snap ring 4.

[0039] As another preferred solution of the present utility model, a sealing ring 6 is further provided inside the locking nut 3, and the sealing ring 6 abuts against the front end of the snap ring 4. The sealing ring 6 is provided with a first inclined surface 61, and the locking head 52 is provided with a second inclined surface 524 adapted to the first inclined surface 61. In this embodiment, as Figure 3 and Figure 6As shown, the setting of the sealing ring 6 increases the sealing performance between the locking head 52 and the corrugated pipe 2. Specifically, during assembly, under the extrusion of the locking head 52, the inner peripheral side of the sealing ring 6 fits against the outer peripheral side of the corrugated pipe 2, and the outer peripheral side of the sealing ring 6 fits against the inner peripheral side of the locking head 52, thereby increasing the sealing performance between the locking head 52 and the corrugated pipe 2. In this embodiment, during the process of screwing the locking head 52 and the locking nut 3 tightly, under the interaction of the first inclined surface 61 and the second inclined surface 524, the inner peripheral side of the sealing ring 6 fits more closely against the outer peripheral side of the corrugated pipe 2, and the contact area between the sealing ring 6 and the locking head 52 is increased, further improving the sealing performance among the locking head 52, the locking nut 3 and the corrugated pipe 2.

[0040] As another preferred solution of the present utility model, a coating layer 22 is provided on the outer periphery of the corrugated pipe 2, and an E-shaped sealing ring 7 is provided between the locking nut 3 and the coating layer 22. A positioning groove 33 for installing the E-shaped sealing ring 7 is provided on the inner wall of the locking nut 3. In this embodiment, as Figure 3 and Figure 5 shown, the E-shaped sealing ring 7 is in sealing cooperation with the outer peripheral side of the coating layer 22 of the corrugated pipe 2, so the sealing performance of the adapter 5 is greatly improved; at the same time, the setting of the E-shaped sealing ring 7 can also block foreign objects from entering the locking nut 3 through the assembly gap, thereby playing a role in preventing pollution. When installing the E-shaped sealing ring 7, the E-shaped sealing ring 7 is clamped in the positioning groove 33, so that the E-shaped sealing ring 7 is not easily detached from the locking nut 3 during use, improving the stability of the E-shaped sealing ring 7.

[0041] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A bellows-to-PPR pipe adapter, comprising a PPR pipe (1) and a bellows (2). A locknut (3) is provided at the end of the bellows (2), and a snap ring (4) is provided inside the locknut (3). The locknut (3) realizes axial limitation with the bellows (2) through the snap ring (4), characterized in that: A conversion joint (5) is provided at the end of the PPR pipe (1). The conversion joint (5) includes a locking sleeve (51) and a locking head (52). The front end of the locking sleeve (51) is fixedly connected to the PPR pipe (1). The rear end of the locking sleeve (51) tightly wraps around the outer wall of the front end of the locking head (52). An external thread section (521) is provided at the rear end of the locking head (52). An internal thread section (31) corresponding to and mating with the external thread section (521) is provided on the inner wall of the locking nut (3).

2. The bellows-to-PPR pipe adapter according to claim 1, characterized in that: The locking sleeve (51) is fixedly connected to the locking head (52) by injection molding.

3. The bellows-to-PPR pipe adapter according to claim 2, wherein: A number of annular grooves (522) are provided at the front end of the locking head (52). Annular protrusions (511) corresponding to and mating with the annular grooves (522) are formed on the inner wall of the locking sleeve (51).

4. A bellows-to-PPR pipe adapter according to claim 1, characterized in that: A limiting step (523) for limiting the front end of the corrugated pipe (2) is provided on the inner circumference of the locking head (52).

5. A bellows-to-PPR pipe adapter according to claim 1, characterized in that: The front end of the locking sleeve (51) is fixedly connected to the PPR pipe (1) by hot melt welding.

6. The bellows-to-PPR pipe adapter according to claim 1, wherein: A stepped portion (32) is provided inside the locking nut (3). The snap ring (4) abuts against the stepped portion (32), and the snap ring (4) is clamped on the wave crest (21) of the corrugated pipe (2).

7. A bellows-to-PPR pipe adapter according to claim 1 or 6, characterized in that: A sealing ring (6) is further provided inside the locking nut (3). The sealing ring (6) abuts against the front end of the snap ring (4).

8. A bellows-to-PPR pipe adapter according to claim 7, characterized in that: The sealing ring (6) is provided with a first inclined surface (61). The locking head (52) is provided with a second inclined surface (524) adapted to the first inclined surface (61).

9. A bellows-to-PPR pipe adapter according to claim 1, characterized in that: A coating layer (22) is provided on the outer circumference of the corrugated pipe (2). An E-shaped sealing ring (7) is provided between the locking nut (3) and the coating layer (22).

10. A bellows-to-PPR pipe adapter according to claim 9, characterized in that: A positioning groove (33) for installing the E-shaped sealing ring (7) is provided on the inner wall of the locking nut (3).

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