Pipe fitting connecting piece

Abstract

The invention discloses a pipe fitting connecting piece, and belongs to the technical field of pipe fitting connection. The square pipe six-direction connecting piece comprises a connector, a cavity is formed in the connector, at least one side face of the connector is provided with a mortise communicated with the cavity, an expansion tenon comprises a horizontal part, a tail part and tenons, the tenons are arranged to be a pair, the tenons are fixed to the two sides of the end of the horizontal part, and arc-shaped guide slopes are arranged at the connecting positions of the tenons and the horizontal part. The inner side of the mortise is provided with a guide arc matched with the arc-shaped guide slope, the expansion block set comprises a first expansion block and a second expansion block which are spliced with each other, the splicing face of the first expansion block and the splicing face of the second expansion block are each provided with an expansion mortise, and the connector and the pipe fitting are preliminarily connected by connecting the expansion tenons into the mortise formed in the connector; and then the expansion tenon is rotated to enable the first expansion block and the second expansion block to move in opposite directions so as to be tightly attached to the pipe wall of the pipe fitting, and stable connection of the connector and the pipe fitting is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting connection, and particularly to a pipe fitting connector. Background Art

[0002] The connection between pipe fittings is generally achieved through pipe fitting connectors. Existing products on the market that are connected by pipe fitting connectors to square pipes or round pipes, such as storage racks, shelves, guardrails, etc., have acceptable stability under static conditions, but may become loose or deformed after long-term use. Under dynamic loads (such as vibration, impact), the connection is more likely to become loose, resulting in structural instability. For example, if a storage rack or shelf becomes loose or collapses, it may cause items to fall, resulting in property damage or personal injury. If a guardrail becomes loose or unstable, it may cause the guardrail to fail and lose its protective function, increasing potential safety hazards. Therefore, it is necessary to improve the connection stability between the pipe fitting connector and the pipe fitting.

[0003] Existing pipe fitting connectors, such as right-angle connectors, T-shaped connectors, cross connectors, L-shaped connectors, etc., usually adopt a plug-in connection method. Reinforcing ribs are provided at the socket of the pipe fitting connector, and fastening is achieved through the friction between the reinforcing ribs and the inner wall of the pipe fitting. The connection stability depends on the friction force between the reinforcing ribs and the inner wall of the pipe. It is easy to become loose after long-term use or under external forces (such as vibration, impact), affecting the structural stability. At the same time, the cooperation between the reinforcing ribs and the inner wall of the pipe fitting requires high precision. If there are dimensional deviations in the pipe or manufacturing errors in the pipe fitting connector, it is also easy to cause insecure connections. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and provide a pipe fitting connector to improve the connection stability between the connector and the pipe fitting.

[0005] The present invention provides a pipe fitting connector, including a connector with a cavity inside. The connector has multiple sides, and at least one side is provided with a mortise communicating with the cavity. The expansion tenon includes a horizontal part, a tail part and a tenon head. The tenon head is provided as a pair, and both of the pair of tenon heads are fixed on both sides of the end of the horizontal part. The tail part is a frustum of a cone with an outer diameter gradually increasing from the end connected to the horizontal part. An arc-shaped guiding slope is provided at the connection between the pair of tenon heads and the horizontal part. A guiding arc adapted to the arc-shaped guiding slope is provided inside the mortise. The mortise has through holes corresponding to the end of the horizontal part and the two tenon heads. The expansion block group includes a first expansion block and a second expansion block that are fitted together. Expansion tenon grooves are provided on the fitting surfaces of the first expansion block and the second expansion block. The expansion tenon groove on the first expansion block and the expansion tenon groove on the second expansion block form a receiving cavity for accommodating the horizontal part and the tail part after the first expansion block and the second expansion block are fitted together. The outer surface after the first expansion block and the second expansion block are spliced is adapted to the inner surface of the pipe fitting. When the expansion tenon is inserted into the mortise and the expansion block group contacts the outer surface of the connector, there is an overlapping area between the pair of tenon heads and the inner side wall of the mortise along the axis direction of the horizontal part. When the connector rotates by a certain angle, the tenon head advances along the arc-shaped guiding slope so that the overlapping area enters the cavity.

[0006] Preferably, the expansion tenon groove includes a semi-circular groove and an inclined groove. The horizontal part is located in the semi-circular groove, and the tail part is located in the inclined groove.

[0007] Preferably, a convex connecting block is provided at the bottom of the first expansion block, a concave connecting groove is provided at the top of the second expansion block, and the fitting surface between the concave connecting groove and the convex connecting block is connected by a wedge-shaped surface. And the outer surface after the first expansion block and the second expansion block are spliced is fitted to the inner side wall of the pipe fitting to be connected.

[0008] Preferably, the mortise includes a cylindrical through hole and rectangular through holes on both sides of the cylindrical through hole. The cylindrical through hole is adapted to the horizontal part, and the rectangular through holes on both sides of the cylindrical through hole are respectively adapted to the pair of tenon heads.

[0009] Preferably, an inclined cutting surface is provided at the end of the horizontal part.

[0010] Preferably, the outer surface contour of the expansion block group after the first expansion block and the second expansion block are spliced is circular, square or oval.

[0011] Preferably, the length of the overlapping area along the axis direction of the horizontal part is 1 mm. When the expansion tenon rotates 90°, the angles of the tails of the first expansion block and the second expansion block rising along the axis direction of the horizontal part are both 3°.

[0012] Preferably, the connector is set as a cube, and mortises are arranged on six faces of the connector.

[0013] Preferably, the mortises are arranged at the centers of the side faces of the connector.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: For a pipe fitting connector of the present invention, first, an expansion tenon is inserted into an expansion block group, and then the expansion block group is inserted into a pipe fitting to be connected. At this time, the horizontal part and the tenon head are inserted into the mortises for preliminary connection. There is an overlapping area between the tenon head and the inner side wall of the mortise along the axis direction of the horizontal part, and the arc-shaped guiding slope formed on the tenon head fits with the guiding arc. Then, the expansion block group is rotated clockwise. Under the action of the arc-shaped guiding slope and the guiding arc, the tenon head will further move into the inner cavity of the connector, generating a pulling effect. The first expansion block and the second expansion block completely wrap the horizontal part and the tail. Since the tail is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part, when the tail generates a forward displacement, the first expansion block and the second expansion block will be squeezed to both sides, so that the first expansion block and the second expansion block are closely attached to the inner side wall of the pipe fitting to be connected. Through the surface friction generated between the first expansion block and the second expansion block and the inner side wall of the pipe fitting, the friction surface is larger and firmer, thereby realizing the tight connection between the connector and the pipe fitting, further improving the connection stability between the connector and the pipe fitting, and avoiding accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure when the expansion tenon of the present invention is initially inserted into the connector.

[0016] Figure 2 It is a schematic diagram of the overall structure after the pipe fitting is rotated by 90° and the first expansion block and the second expansion block are expanded.

[0017] Figure 3 It is a schematic diagram of the expansion tenon structure of the present invention.

[0018] Figure 4 It is a schematic diagram of the first expansion block structure of the present invention.

[0019] Figure 5 It is a schematic diagram of the second expansion block structure of the present invention.

[0020] Figure 6 It is a schematic diagram of the connector structure of the present invention.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. Connector; 2. Expansion tenon; 21. Horizontal portion; 22. Tail portion; 3. Expansion block group; 31. First expansion block; 32. Second expansion block; 4. Mortise; 5. Tenon; 6. Guide arc; 7. Arc-shaped guide slope; 8. Cylindrical through hole; 9. Expansion tenon groove; 901. Semi-annular groove; 902. Inclined groove; 10. Concave connecting groove; 11. Convex connecting block. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1 to 6 In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the usual meanings understood by people with general skills in the field to which the present invention belongs.

[0023] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. "Inside", "outside", "upper", "lower", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The drawings in the present invention are not drawn strictly according to the actual scale. The specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structure.

[0024] The present invention provides a pipe connector, such as Figures 1 to 6As shown in the figure, it includes a connector 1 with a cavity inside. The connector 1 has multiple sides, and mortises 4 communicating with the cavity are provided on at least one side. The expansion tenon 2 includes a horizontal part 21, a tail part 22 and a tenon head 5. The tenon head 5 is provided as a pair, and both of the pair of tenon heads 5 are fixed to both sides of the end of the horizontal part 21. The tail part 22 is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part 21. An arc-shaped guiding slope 7 is provided at the connection between the pair of tenon heads 5 and the horizontal part 21. A guiding arc 6 adapted to the arc-shaped guiding slope 7 is provided inside the mortise 4. The mortise 4 has through holes corresponding to the end of the horizontal part 21 and the two tenon heads 5. The expansion block group 3 includes a first expansion block 31 and a second expansion block 32 that are joined together. Expansion tenon grooves 9 are provided on the joining surfaces of the first expansion block 31 and the second expansion block 32. The expansion tenon groove 9 on the first expansion block 31 and the expansion tenon groove 9 on the second expansion block 32 form a receiving cavity for receiving the horizontal part 21 and the tail part 22 after the first expansion block 31 and the second expansion block 32 are joined together. The outer surface after the first expansion block 31 and the second expansion block 32 are joined is adapted to the inner surface of the pipe fitting. When the expansion tenon 2 is inserted into the mortise 4 and the expansion block group 3 contacts the outer surface of the connector 1, there is an overlapping area between the pair of tenon heads 5 and the inner side wall of the mortise 4 along the axis direction of the horizontal part 21. When the connector 1 rotates by a certain angle, the tenon head 5 advances along the arc-shaped guiding slope 7 so that the overlapping area enters the cavity.

[0025] First, the expansion tenon 2 is installed in the expansion block group 3, and then the expansion block group 3 is inserted into the pipe fitting to be connected. At this time, the horizontal part 21 and the tenon head 5 are inserted into the mortise 4 for preliminary connection. There is an overlapping area between the tenon head 5 and the inner side wall of the mortise 4 along the axis direction of the horizontal part 21, and the arc-shaped guiding slope 7 provided on the tenon head 5 fits with the guiding arc 6. At this time, the expansion block group 3 is rotated clockwise. Under the action of the arc-shaped guiding slope 7 and the guiding arc 6, the tenon head 5 will further move into the inner cavity of the connector 1, and a pulling effect will be generated. The first expansion block 31 and the second expansion block 32 completely wrap the horizontal part 21 and the tail part 22. Since the tail part 22 is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part 21, when the tail part 22 generates a forward displacement, the first expansion block 31 and the second expansion block 32 will be squeezed to both sides, so that the first expansion block 31 and the second expansion block 32 are closely attached to the inner side wall of the pipe fitting to be connected. By generating surface friction between the first expansion block 31 and the second expansion block 32 and the inner side wall of the pipe fitting, the friction surface is larger and firmer, so as to realize the tight connection between the connector 1 and the pipe fitting, further improve the connection stability between the connector 1 and the pipe fitting, and avoid accidents.

[0026] Preferably, as Figures 1 to 4 shown, the expansion tenon groove 9 includes a semi-circular groove 901 and an inclined groove 902. The horizontal part 21 is located in the semi-circular groove 901, and the tail part 22 is located in the inclined groove 902.

[0027] The expansion tenon groove 9 includes a semi-circular groove 901 and an inclined groove 902. Since the tail part 22 is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part 21, when the horizontal part 21 and the tail part 22 of the expansion tenon 2 move, the first expansion block 31 and the second expansion block 32 will be squeezed to both sides, so that the first expansion block 31 and the second expansion block 32 are closely attached to the inner side wall of the pipe fitting and squeeze the side wall of the pipe fitting. The friction surface generated between the first expansion block 31 and the second expansion block 32 and the inner side wall of the pipe fitting is larger and firmer, thereby improving the connection stability between the connector 1 and the pipe fitting.

[0028] Preferably, as Figures 1 to 6 shown, a convex connecting block 11 is provided at the bottom of the first expansion block 31, a concave connecting groove 10 is provided at the top of the second expansion block 32, and the joint surface of the concave connecting groove 10 and the convex connecting block 11 is connected by a wedge-shaped surface. And the outer surface of the first expansion block 31 and the second expansion block 32 after splicing fits the inner side wall of the pipe fitting to be connected. The mortise 4 includes a cylindrical through hole 8 and rectangular through holes on both sides of the cylindrical through hole 8. The cylindrical through hole 8 is adapted to the horizontal part 21, and the rectangular through holes on both sides of the cylindrical through hole 8 are respectively adapted to a pair of tenons 5.

[0029] In the present invention, a convex connecting block 11 is provided at the bottom of the first expansion block 31, a concave connecting groove 10 is provided at the top of the second expansion block 32, and the joint surface of the concave connecting groove 10 and the convex connecting block 11 is connected by a wedge-shaped surface, so that the first expansion block 31 and the second expansion block 32 can stably move to both sides. The cylindrical through hole 8 is adapted to the horizontal part 21, and the rectangular through holes on both sides of the cylindrical through hole 8 are respectively adapted to a pair of tenons 5, so as to make the connection between the connector 1 and the pipe fitting more stable.

[0030] Preferably, as Figure 6 shown, an inclined cutting surface is provided at the end of the horizontal part 21. The outer surface contour of the expansion block group 3 formed by splicing the first expansion block 31 and the second expansion block 32 is circular, square or elliptical. The length of the overlapping area along the axis direction of the horizontal part 21 is 1 mm. When the expansion tenon 2 rotates 90°, the angles of the tails 22 of the first expansion block 31 and the second expansion block 32 expanding and lifting along the axis direction of the horizontal part 21 are both 3°.

[0031] In the present invention, the longitudinal section of the expansion block group 3 formed by splicing the first expansion block 31 and the second expansion block 32 is circular, square or oval, and can be used to connect square pipes, circular pipes or oval pipes, making the device provided by the present invention diverse. There is an overlapping area between the inner side walls of the tenon 5 and the mortise 4 along the axis direction of the horizontal part 21, and the length of the overlapping area along the axis direction of the horizontal part 21 is 1 mm. When the expansion tenon 2 rotates 90°, the angles of the tails 22 of the first expansion block 31 and the second expansion block 32 expanding and lifting along the axis direction of the horizontal part 21 are both 3°, avoiding insufficient friction due to too small a lifting angle and also avoiding damage to the pipe fittings due to too large a lifting angle.

[0032] Preferably, the connector 1 is set as a cube, and mortises 4 are arranged on all six faces of the connector 1, and the mortises 4 are arranged at the centers of the side faces of the connector 1.

[0033] In the present invention, the connector 1 is set as a cube, and mortises 4 are arranged on all six faces, so that pipe fittings in different directions can be connected according to actual use conditions, which is convenient and fast. Moreover, in the present invention, the mortises 4 are arranged at the centers of the side faces of the connector 1, making the connection between the connector 1 and the pipe fittings closer and improving the aesthetics of the connection between the connector 1 and the pipe fittings.

[0034] The usage method of the pipe fitting connector of the present invention is as follows: First, insert the expansion tenon 2 into the expansion block group 3, and then insert the expansion block group 3 into the pipe fittings to be connected first. At this time, insert the expansion tenon 2 into the mortise 4 for preliminary connection. At this time, there is a 1-mm overlapping area between a pair of tenons 5 and the inner side walls of the mortise 4 along the axis direction of the horizontal part 21, and the arc-shaped guiding slope 7 opened on the tenon 5 fits with the guiding arc 6; Then rotate the connector 1 clockwise by 90°. Under the action of the arc-shaped guiding slope 7 and the guiding arc 6, the tenon 5 will further move into the inner cavity of the connector 1, generating a pulling effect. During the pulling process, the expansion tenon 2 will expand the first expansion block 31 and the second expansion block 32, making the first expansion block 31 and the second expansion block 32 closely adhere to the inner side walls of the pipe fittings to be connected, thereby generating expansion friction with the pipe fitting ports to realize the firm connection between the connector 1 and the pipe fittings.

[0035] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe connector, characterized in that: include: A connector (1) having a cavity therein, the connector (1) having a plurality of side surfaces, and at least one side surface having a mortise (4) in communication with the cavity; An expansion tenon (2) comprises a horizontal portion (21), a tail portion (22) and a tenon (5), wherein the tenon (5) is arranged in a pair, and the pair of tenons (5) are fixed at both sides of the end of the horizontal portion (21), the tail portion (22) is a truncated cone whose diameter gradually increases from one end connected to the horizontal portion (21) to the outside, an arc-shaped guide slope (7) is provided at the connection between the pair of tenons (5) and the horizontal portion (21), a guide arc (6) matching the arc-shaped guide slope (7) is opened inside the mortise (4), and the mortise (4) has a through hole corresponding to the end of the horizontal portion (21) and the two tenons (5); The expansion block group (3) comprises a first expansion block (31) and a second expansion block (32) which are assembled with each other. The assembled surfaces of the first expansion block (31) and the second expansion block (32) are both provided with an expansion tenon groove (9). After the first expansion block (31) and the second expansion block (32) are assembled, the expansion tenon groove (9) on the first expansion block (31) and the expansion tenon groove (9) on the second expansion block (32) form a receiving cavity for receiving the horizontal portion (21) and the tail portion (22). The outer surface of the first expansion block (31) and the second expansion block (32) after being assembled is matched with the inner surface of the pipe fitting. When the expansion tenon (2) is inserted into the mortise (4) and the expansion block group (3) contacts the outer surface of the connector (1), a pair of the tenons (5) and the inner side wall of the mortise (4) have an overlapping area along the axial direction of the horizontal portion (21). When the connector (1) is rotated at a certain angle, the tenons (5) are pushed along the arc-shaped guide slope (7) so that the overlapping area enters the cavity.

2. A pipe connector according to claim 1, characterized in that: The expansion tenon groove (9) comprises a semi-annular groove (901) and an inclined groove (902), the horizontal portion (21) is located in the semi-annular groove (901), and the tail portion (22) is located in the inclined groove (902).

3. A pipe connector according to claim 1, characterized in that: A convex connection block (11) is provided at the bottom of the first expansion block (31), a concave connection groove (10) is provided at the top of the second expansion block (32), and the mating surfaces of the concave connection groove (10) and the convex connection block (11) are connected by wedge-shaped surfaces, and the outer surfaces of the first expansion block (31) and the second expansion block (32) after being spliced ​​fit with the inner side wall of the pipe fitting to be connected.

4. A pipe connector according to claim 1, characterized in that: The mortise (4) comprises a cylindrical through hole (8) and rectangular through holes located on both sides of the cylindrical through hole (8), the cylindrical through hole (8) is matched with the horizontal portion (21), and the rectangular through holes located on both sides of the cylindrical through hole (8) are respectively matched with a pair of tenons (5).

5. A pipe connector according to claim 1, characterized in that: An inclined cut surface is provided at the end of the horizontal portion (21).

6. A pipe connector according to claim 1, characterized in that: The outer surface contour of the expansion block group (3) after the first expansion block (31) and the second expansion block (32) are spliced ​​together is circular, square or elliptical.

7. A pipe connector according to claim 1, characterized in that: The length of the overlapping area along the axial direction of the horizontal portion (21) is 1 mm, and when the expansion tenon (2) is rotated 90°, the angles of expansion and lifting of the tails of the first expansion block (31) and the second expansion block (32) along the axial direction of the horizontal portion (21) are both 3°.

8. A pipe connector according to claim 1, characterized in that: The connector (1) is configured as a cube, and mortises (4) are provided on six faces of the connector (1).

9. A pipe connector according to claim 1, characterized in that: The mortise (4) is arranged at the center of the side surface of the connector (1).

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