Novel glass fiber reinforced plastic elbow

Abstract

The utility model relates to a novel glass fiber reinforced plastic elbow which is characterized in that the novel glass fiber reinforced plastic elbow (100) is provided with a bent pipe section (7) and a straight pipe section (8) arranged at at least one end of the bent pipe section (7), the bent pipe section (7) is provided with a first lining layer (1) and a first outer reinforcing layer (2) surrounding the first lining layer (1), the first outer reinforcement layer (2) of the elbow section (7) extends continuously in the length direction and surrounds not only the first inner liner (1) of the elbow section (7) but also the straight section (8) in the length direction. According to the utility model, on one hand, the impermeability of the joint can be easily improved; and on the other hand, installation of the novel glass fiber reinforced plastic elbow can be simplified. In addition, the novel glass fiber reinforced plastic elbow disclosed by the utility model can be manufactured by utilizing an existing mold, so that the manufacturing cost can be saved.

Description

Technical Field

[0001] The utility model relates to a novel glass fiber reinforced plastic elbow. Background Art

[0002] When using a FRP elbow to connect a straight FRP pipe, sealant is typically applied to the ends of the FRP elbow and the straight FRP pipe at the construction site, and the two are aligned and sealed. FRP is typically made from a glass fiber fabric impregnated with a resin matrix, which is then hardened. FRP elbows are a type of FRP pipe. However, existing FRP elbows are curved throughout, resulting in poor alignment when connected end-to-end with the straight FRP pipe, creating the risk of misalignment. Furthermore, the curved FRP elbow is difficult to clamp during connection, making installation difficult.

[0003] CN201062700Y discloses a fiberglass reinforced plastic elbow. This fiberglass reinforced plastic elbow is constructed as a tube with internal threads at both ends of the curved inner wall. The tube wall of this fiberglass reinforced plastic elbow consists of an inner lining layer and a reinforcement layer. The inner lining layer is wrapped with four layers of polyester felt, where any raised polyester felt is tightly wrapped and flattened using a single fiberglass reinforced plastic yarn. Three layers of fiberglass reinforced plastic cloth are then wrapped around the inner lining layer, followed by twelve layers of hoop roving, with a layer of fiberglass reinforced plastic woven cloth sandwiched between every two layers of roving to create the reinforcement layer. However, the production of this fiberglass reinforced plastic elbow requires complex mold development.

[0004] CN213745449U discloses an environmentally friendly fiberglass reinforced plastic elbow. The elbow comprises an elbow body configured as a curved cylinder. The elbow body includes a curved cylindrical portion and end portions disposed at either end of the curved portion. Each end portion is fixedly provided with a connecting portion. Snap fasteners are symmetrically arranged on the inner walls of the end portions, and a filter collection bag is housed within the elbow body for use with the snap fasteners. However, the manufacture of this environmentally friendly fiberglass reinforced plastic elbow also requires the development of a costly mold. Utility Model Content

[0005] The purpose of the present invention is to provide a novel fiberglass elbow that can at least solve one of the above-mentioned problems.

[0006] In order to achieve the above-mentioned purpose, the present invention proposes a new type of fiberglass elbow, wherein the new type of fiberglass elbow has a bent pipe section and a straight pipe section arranged at at least one end of the bent pipe section, the bent pipe section has a first inner lining layer and a first outer reinforcement layer surrounding the first inner lining layer, wherein the first outer reinforcement layer of the bent pipe section extends continuously in the length direction and, in the length direction, not only completely surrounds the first inner lining layer of the bent pipe section but also partially surrounds the straight pipe section.

[0007] Thus, the novel glass fiber reinforced plastic elbow according to the present application can easily align the novel glass fiber reinforced plastic elbow with the straight pipe to be connected, and can reduce or avoid the gap between the layers of the material wrapped around the connection and between the layers of the material and the straight pipe section, thereby improving the impermeability of the connection. On the other hand, the straight pipe section can be easily clamped, thereby simplifying the installation of the novel glass fiber reinforced plastic elbow. In addition, the novel glass fiber reinforced plastic elbow according to the present application can be manufactured using existing molds, thereby saving manufacturing costs.

[0008] Advantageously, the straight pipe section has a second inner liner layer and a second outer reinforcement layer surrounding the second inner liner layer, and the first outer reinforcement layer of the elbow section partially surrounds the second outer reinforcement layer of the straight pipe section in the length direction.

[0009] Advantageously, the first inner liner layer of the elbow section and the second inner liner layer of the straight pipe section have the same cross-sectional size and are aligned with each other.

[0010] Advantageously, the first inner liner layer of the elbow section and the second inner liner layer of the straight pipe section are bonded to each other by an adhesive.

[0011] Advantageously, the straight pipe section has a longitudinal length of at least 50 mm.

[0012] Advantageously, the first outer reinforcement layer of the elbow section surrounds the straight pipe section over less than half the length of the straight pipe section.

[0013] Advantageously, the first inner liner layer of the elbow section and the second inner liner layer of the straight pipe section are made of the same material, and / or the first outer reinforcement layer of the elbow section and the second outer reinforcement layer of the straight pipe section are made of the same material.

[0014] Advantageously, the novel glass fiber reinforced plastic elbow has two straight pipe sections respectively provided at both ends of the elbow section. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be explained in more detail below by means of embodiments with reference to the accompanying drawings, but the present application is not limited to the embodiments described in the drawings and explained in detail below. The drawings are as follows:

[0016] Figure 1 A longitudinal sectional view of a glass fiber reinforced plastic elbow according to the prior art is schematically shown.

[0017] Figure 2 A longitudinal sectional view of a novel glass fiber reinforced plastic elbow according to an embodiment of the present application is schematically shown.

[0018] Figure 3 A longitudinal sectional view of a novel glass fiber reinforced plastic elbow according to an embodiment of the present application is schematically shown. Figure 2A longitudinal sectional view of a novel glass fiber reinforced plastic elbow is shown in FIG, wherein a curved pipe section and two straight pipe sections of the novel glass fiber reinforced plastic elbow are shown separately. DETAILED DESCRIPTION

[0019] An illustrative embodiment of the novel fiberglass elbow of the present invention is described below. In this specification, for the purpose of explanation only, various systems, structures and devices are schematically depicted in the accompanying drawings, but not all features of the actual systems, structures and devices are described. For example, well-known functions or structures are not described in detail to avoid unnecessary details that make the present invention unclear. It should be understood that in any actual application, many specific implementation decisions need to be made to achieve the specific goals of the developer or user, and system-related and industry-related restrictions need to be complied with. These specific goals may vary from one actual application to another. In addition, it should be understood that such specific implementation decisions, although complex and time-consuming, are routine tasks for ordinary technicians in the field who benefit from the present invention.

[0020] The terms and phrases used herein should be understood and interpreted as having a meaning consistent with the understanding of those terms and phrases by those skilled in the relevant art. No special definition of a term or phrase, i.e., a definition that is different from the ordinary and customary meaning as understood by those skilled in the art, is intended to be implied by consistent usage of a term or phrase herein. For terms or phrases that are intended to have a special meaning, i.e., a meaning that is different from that understood by those skilled in the art, such special definition will be explicitly set forth in the specification as a definition, directly and unambiguously giving the special definition of the term or phrase.

[0021] Unless the content requires otherwise, throughout the following description, the word "include" and variations such as "comprising" and "having" are to be interpreted in an open and inclusive sense, that is, as in "including but not limited to".

[0022] Figure 1A longitudinal sectional view of a glass steel elbow 100' according to the prior art is schematically shown. The glass steel elbow 100' has an inner liner 1' and an outer reinforcement layer 2' surrounding the inner liner 1'. The inner liner 1' can be made of a glass fiber knitted mat impregnated with a resin matrix, for example. The glass fiber knitted mat impregnated with a resin matrix has a tight structure which is impervious after hardening of the resin matrix and is corrosion resistant, so that it can be used as the inner liner 1' which directly contacts a medium flowing in the pipe. In manufacturing the inner liner 1', a mold (not shown) coated with a release agent is provided first. Then, the glass fiber knitted mat impregnated with a resin matrix is wound onto the mold, and finally, the manufactured inner liner 1' is taken off from the mold after the resin on the glass fiber knitted mat is cured. The mold is configured in a circular arc shape in the longitudinal direction and has a circular cross section, so that the manufactured inner liner 1' has a circular ring-shaped cross section. The outer reinforcement layer 2' can be made of a glass fiber cloth impregnated with a resin matrix or by a glass fiber chopped mat impregnated with a resin matrix, for example. In manufacturing the outer reinforcement layer 2', the glass fiber cloth or the glass fiber chopped mat impregnated with a resin matrix is wound around the already formed inner liner 1'. After the resin matrix on the glass fiber cloth or the glass fiber chopped mat is hardened, the glass fiber cloth or the glass fiber chopped mat forms the outer reinforcement layer 2' surrounding the inner liner 1'. The outer reinforcement layer 2' serves to reinforce the strength of the inner liner 1' and thus the entire glass steel elbow 100'. The inner liner 1' and the outer reinforcement layer 2' together form the glass steel elbow 100'.

[0023] Figure 1 The manufactured glass steel elbow 100' is configured in a circular arc shape in the longitudinal direction, more precisely has a quarter of the length of a full circle.

[0024] Referring to Figure 1The fiberglass reinforced plastic elbow 100' has two end surfaces 3' and 4': an upper left end surface 3' and a lower right end surface 4'. The inner lining layer 1' and the outer reinforcement layer 2' can terminate flush at both end surfaces 3' and 4'. The angle between the two end surfaces 3' and 4' can be 90°, as shown. The fiberglass reinforced plastic elbow 100' can have an upper left opening 5' and a lower right opening 6' that communicate with each other at its two end surfaces 3' and 4'. When using the FRP elbow 100' for connection, first apply adhesive to the two end surfaces 3' and 4'. Then, the two straight pipes to be connected (not shown here, "straight pipe" is defined as at least the joint section where it connects to the FRP elbow 100' is straight. Whether other parts of the pipes are strictly straight is not limited in this utility model) can be aligned and abutted with the two end surfaces 3' and 4' of the FRP elbow 100' respectively. In particular, the upper left opening 5' and lower right opening 6' of the FRP elbow 100' are aligned with the openings at the ends of the two pipes to be connected, thereby bonding the FRP elbow 100' and the two pipes to be connected using adhesive. Subsequently, the connection is wrapped with glass fiber cloth impregnated with a resin matrix or glass fiber chopped strand mat impregnated with a resin matrix. After the resin matrix solidifies, the FRP elbow 100' and the two pipes to be connected are fixedly connected.

[0025] However, because the FRP elbow 100' is completely curved, or in other words, the sections of the FRP elbow 100' adjacent to the upper left end face 3' and the lower right end face 4' are not straight, the upper left end face 3' and the lower right end face 4' of the FRP elbow 100' cannot be properly aligned with the two straight pipes to be connected, for example due to possible manufacturing tolerances. More specifically, the upper left opening 5' at the upper left end face 3' and the lower right opening 6' at the lower right end face 4' cannot be properly aligned with the openings of the two pipes to be connected, resulting in installation misalignment, which can cause the medium guided within the pipes to leak from the connection. In addition, when the connection is wrapped with glass fiber cloth or glass fiber chopped strand mat impregnated with a resin matrix at the construction site, gaps are easily generated between the curved FRP elbow 100' and the glass fiber cloth or glass fiber chopped strand mat, as well as between the layers of the glass fiber cloth or glass fiber chopped strand mat, resulting in unsatisfactory anti-seepage effect at the connection. In addition, due to the completely curved shape of the FRP elbow 100 ′, it is not easy to clamp the curved FRP elbow 100 ′ compared to clamping a straight section, which increases the difficulty of construction.

[0026] Figure 2 and Figure 3 A novel fiberglass elbow 100 according to one embodiment of the present invention is shown.

[0027] See also Figure 2 and Figure 3The novel glass steel elbow 100 has a bend section 7 and two straight sections 8. The bend section 7 of the novel glass steel elbow 100 has a left upper end face 3 and a right lower end face 4, and the two straight sections 8 can extend perpendicularly to the left upper end face 3 and the right lower end face 4 respectively and be connected with the bend section 7. However, it is conceivable that only one of the end faces of the novel glass steel elbow 100 is connected with a straight section 8, while the other end face is not connected with a straight section 8. The novel glass steel elbow 100 can have a left upper opening 5 and a right lower opening 6 at its two end faces 3, 4 which are in communication with each other, and the end openings 11, 12 of the two straight sections 8 which are directed towards the left upper opening 5 and the right lower opening 6 respectively can be aligned with the two openings 5, 6 respectively.

[0028] Referring to Figure 2 and Figure 3 , the bend section 7 has an inner lining layer 1 and an outer reinforcing layer 2. The two straight sections 8 likewise can have an inner lining layer 9 and an outer reinforcing layer 10 respectively. The thickness of the outer reinforcing layers 2, 10 is generally much greater than the thickness of the inner lining layers 1, 9. The inner lining layers 1, 9 likewise can be made of glass fiber knitted felt impregnated with a resin matrix, for example. The outer reinforcing layers 2, 10 likewise can be made of glass fiber cloth impregnated with a resin matrix or by glass fiber chopped felt impregnated with a resin matrix, for example. The manufacturing steps of the novel glass steel elbow 100 are described illustratively as follows:

[0029] Step one: manufacturing the inner lining layer 1 of the bend section 7. In manufacturing the inner lining layer 1, a mold (not shown) coated with a release agent is provided first. Then, the glass fiber knitted felt impregnated with a resin matrix is wound onto the mold. The mold of the glass steel elbow 100' in the prior art Figure 1 can be used here, thereby saving the cost of mold development. Finally, after the resin matrix on the glass fiber knitted felt is cured, the manufactured inner lining layer 1 is taken off the mold.

[0030] Step two: joining the inner lining layer 1 and the two straight sections 8. Here, the two straight sections 8 can be already manufactured and thus have the inner lining layer 9 and the outer reinforcing layer 10. First, the two end faces of the inner lining layer 1 of the bend section 7 are smeared with adhesive, and then the end openings 11, 12 of the two straight sections 8 are aligned with and abut against the left upper opening 5 and the right lower opening 6 of the inner lining layer 1 of the bend section 7 respectively. At this time, the outer diameter of the inner lining layer 1 of the bend section 7 is smaller than the outer diameter of the straight sections 8.

[0031] Step 3: Manufacturing the outer reinforcement layer 2 of the curved pipe section 7. When manufacturing the outer reinforcement layer 2, a glass fiber cloth impregnated with a resin matrix or a glass fiber chopped strand mat impregnated with a resin matrix is ​​used to wrap the entire length of the formed inner lining layer 1 and the partial length of the two straight pipe sections 8 close to the inner lining layer 1, so that the outer reinforcement layer 2 of the curved pipe section 7 overlaps a partial section of the outer reinforcement layer 10 of the straight pipe section 8 from the radial outside. After the resin matrix on the glass fiber cloth or the glass fiber chopped strand mat is hardened, the glass fiber cloth and the glass fiber chopped strand mat constitute the outer reinforcement layer 2 that surrounds the entire inner lining layer 1 and a portion of the straight pipe section 8. However, it is also conceivable that the outer reinforcement layer 2 is made by alternately winding the glass fiber cloth impregnated with a resin matrix and the glass fiber chopped strand mat impregnated with a resin matrix.

[0032] The above-mentioned manufacturing process of novel glass fiber reinforced plastic elbow 100 can be easily carried out in factory. The novel glass fiber reinforced plastic elbow 100 with straight pipe section 8 that has been manufactured can be conveniently connected to the straight pipeline to be connected at the construction site.

[0033] See also Figure 2 and Figure 3 The inner lining layer 1 of the curved pipe section 7 and the inner lining layer 9 of the straight pipe section 8 can have the same cross-sectional dimensions and be aligned with each other and, if necessary, bonded together with the aid of an adhesive. The outer reinforcement layer 2 of the finished curved pipe section 7 not only surrounds the inner lining layer 1 of the curved pipe section 7, but also partially surrounds the outer reinforcement layer 10 of the straight pipe section 8 adjacent to the curved pipe section 7.

[0034] See also Figure 2 As can be seen, the outer reinforcement layer 2 of the curved pipe section 7 covers a portion of the axial length of the straight pipe section 8, thereby ensuring a secure connection between the curved pipe section 7 and the straight pipe section 8. It can also be provided that the straight pipe section 8 has a longitudinal length or axial length of at least 50 mm to ensure sufficient clamping length when subsequently connected to a straight pipe.

[0035] See also Figure 2 It can be seen that the angle between the two end faces 3 , 4 of the curved pipe section 7 can be 90° as shown.

[0036] The main technical effects that can be achieved by the new fiberglass elbow 100 according to the present utility model include but are not limited to at least one of the following:

[0037] 1) When using the novel fiberglass reinforced plastic elbow 100 of the present invention to connect straight pipes, the connection is made between two straight sections (i.e., the straight pipe section 8 of the novel fiberglass reinforced plastic elbow 100 and the straight pipe to be connected). Therefore, alignment problems and installation misalignment are less likely to occur, thereby simplifying installation while ensuring anti-seepage.

[0038] 2) When the novel FRP elbow 100 of the present invention is used to connect straight pipes to be connected, when the glass fiber cloth or glass fiber chopped strands mat impregnated with a resin matrix is ​​used to wrap the connection (i.e., the connection between the straight pipe section 8 of the novel FRP elbow 100 and the straight pipe to be connected), since the glass fiber cloth or glass fiber chopped strands mat impregnated with a resin matrix is ​​wrapped around two straight sections, gaps are less likely to appear between the layers of the glass fiber cloth or glass fiber chopped strands mat and between the glass fiber cloth or glass fiber chopped strands mat and the straight pipe section 8, thereby improving the anti-permeability of the connection.

[0039] 3) When the novel FRP elbow 100 of the present invention is used to connect straight pipes to be connected, the straight pipe section of the novel FRP elbow 100 can be easily and securely clamped by a clamp, which simplifies installation compared to the FRP elbow 100' without a straight pipe section.

[0040] 4) The new fiberglass reinforced plastic elbow 100 having a straight pipe section 8 can be manufactured using the existing mold used to manufacture the elbow section 7 without developing a new mold, thereby saving manufacturing costs.

[0041] Finally, it should be pointed out that the above embodiments are only used to understand and explain the present invention and do not limit the scope of protection of the present invention. For those skilled in the art, modifications can be made based on the above embodiments, and all such modifications do not depart from the scope of protection of the present invention.

Claims

1. A new type of glass fiber reinforced plastic elbow, characterized in that: The novel fiberglass elbow (100) comprises a curved pipe section (7) and a straight pipe section (8) arranged at at least one end of the curved pipe section (7), wherein the curved pipe section (7) comprises a first inner lining layer (1) and a first outer reinforcement layer (2) surrounding the first inner lining layer (1), wherein the first outer reinforcement layer (2) of the curved pipe section (7) extends continuously in the length direction and not only completely surrounds the first inner lining layer (1) of the curved pipe section (7) in the length direction but also partially surrounds the straight pipe section (8).

2. The new fiberglass elbow according to claim 1 is characterized in that: The straight pipe section (8) has a second inner lining layer (9) and a second outer reinforcement layer (10) surrounding the second inner lining layer (9); the first outer reinforcement layer (2) of the curved pipe section (7) partially surrounds the second outer reinforcement layer (10) of the straight pipe section (8) in the length direction.

3. The new fiberglass elbow according to claim 2 is characterized in that: The first inner lining layer (1) of the curved pipe section (7) and the second inner lining layer (9) of the straight pipe section (8) have the same cross-sectional dimensions, and are aligned with each other.

4. The new fiberglass elbow according to claim 3 is characterized in that: The first inner lining layer (1) of the curved pipe section (7) and the second inner lining layer (9) of the straight pipe section (8) are bonded to each other by an adhesive.

5. The novel glass fiber reinforced plastic elbow according to any one of claims 1 to 3, characterized in that: The straight pipe section (8) has a longitudinal length of at least 50 mm.

6. The novel glass fiber reinforced plastic elbow according to any one of claims 1 to 3, characterized in that: The first outer reinforcement layer (2) of the curved pipe section (7) surrounds the straight pipe section (8) over less than half the length of the straight pipe section (8).

7. The novel glass fiber reinforced plastic elbow according to claim 2 is characterized in that: The first inner lining layer (1) of the curved pipe section (7) and the second inner lining layer (9) of the straight pipe section (8) are made of the same material, and / or the first outer reinforcement layer (2) of the curved pipe section (7) and the second outer reinforcement layer (10) of the straight pipe section (8) are made of the same material.

8. The novel fiberglass elbow according to any one of claims 1 to 3, characterized in that: The novel glass fiber reinforced plastic elbow (100) has two straight pipe sections (8) respectively arranged at both ends of the curved pipe section (7).

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