Plug connector for connecting pipes with an oval cross-section

Abstract

A push-fit connection for connecting pipes with an oval cross-section, comprising at least one transition piece (12) for receiving the pipes to be connected, to which a shoulder (13) is attached, which terminates in a base (14), wherein a seal (2) is arranged in the base (14) and is held clamped in the base (14), wherein the clamping of the seal (2) in the base (14) is caused by a crimp (17), characterized in that the seal (2) consists of a base body (21) to which a first lip (22) is formed and adjacent to the first lip (22) a second lip (23) is formed on the base body (21), which is arranged at one end of the base body (21).

Description

[0001] The invention relates to a plug connection for connecting pipes with an oval cross-section, with at least one transition piece for receiving the pipes to be connected, to which a shoulder is attached that ends in a base.

[0002] The push-fit connection considered here forms a connecting element between pipes, particularly for air ducting. The connecting element is a fitting with a push-fit connection at each end. It is made of a dimensionally stable material, preferably sheet metal or steel grade ST 37; however, aluminum, stainless steel, or copper can also be used. The pipes have a wide variety of applications. For example, they are used to supply drawn-in air, such as contaminated air, to a filter or to discharge it from a room to the outside. They are also used to distribute heated or cooled fresh air for heating and ventilation of a building. The pipes have round or oval cross-sections.

[0003] Due to increased energy efficiency requirements, efforts are made to avoid pressure losses when water flows through pipes connected by push-fit fittings. The greatest losses occur at the points where the individual pipes that make up the entire pipeline are connected by push-fit fittings. The pipes are typically connected to the fittings by simply pushing them together. The advantage of this type of connection is that it requires minimal assembly time, resulting in cost-effective installation. However, a disadvantage of this type of connection is that tolerances in the inserted components can lead to pressure losses in the system.

[0004] To reduce these losses, it is therefore necessary to provide a seal at the connection points between the pipes and the fittings.

[0005] With round cross-sections, sealing is achieved using a lip seal, which, due to the rotationally symmetrical shape of the pipe and fitting, conforms evenly to the pipe. This type of seal does not exist with oval cross-sections due to the altered geometry. This is because the sealing effect is uneven in the connection areas of oval geometries. While it is comparable to that of completely round geometries in the highly rounded areas, it is minimal in the less rounded or even flatter areas. Particularly with relatively wide pipe cross-sections, deflection can even occur, making sealing with conventional seals difficult.

[0006] Up to now, sheet metal screws have been screwed through the pipe into the push-fit connection in the overlapping areas to increase the sealing effect. The overlapping areas are then additionally wrapped with adhesive tape to further improve the seal. While these measures do result in a suitable seal, they are very complex and time-consuming. Furthermore, this type of sealing is only possible after the pipe and push-fit connection or fitting have been joined, requiring rework of all connection points.

[0007] The invention aims to remedy this problem. The invention is based on the objective of creating a push-fit connection for joining pipes with an oval cross-section that enables a reliable seal in the less or not at all rounded insertion areas. According to the invention, this objective is achieved by arranging a seal in the base. The additional creation of a dimensionally stable, elongated contour in the straight area of ​​the fitting, in combination with the seal, ensures a tight seal between the pipe and the push-fit connector.

[0008] The invention provides a push-fit connection for joining pipes with oval cross-sections, enabling a reliable seal even in the less or not at all rounded insertion areas. This is achieved by the inclusion of a seal, which improves the sealing effect. The seal is applied immediately during the insertion process, conforming to the shape of the inserted pipe, thus ensuring a better seal. The additional creation of a dimensionally stable, elongated contour in the straight section of the push-fit connection, in combination with the seal, guarantees a tight seal between the pipe and the connector.

[0009] In one embodiment of the invention, the seal is clamped in the base, preferably by means of a crimp. The clamped arrangement provides a reliable fastening of the seal to the connector, and the crimp is simultaneously easy to produce and also protects the seal from damage when the pipes are inserted together.

[0010] In a further development of the invention, the seal consists of a base body to which a first lip is formed, and preferably a second lip is formed adjacent to the first lip. The lips improve the sealing effect because they are able to compensate for any unevenness in the interlocking parts. This applies in particular to the deflection that sometimes occurs in relatively wide channels. Consequently, the sealing effect is improved.

[0011] Preferably, the connector has two strongly rounded sections connected by non-rounded sections, with a rod positioned between these non-rounded sections. Particularly in very wide channels, the rod increases the connector's stability, thereby improving the connection of the pipes in the non-rounded sections by counteracting pipe deflection and potential vibrations caused by the large width.

[0012] Other embodiments and configurations of the invention are specified in the remaining dependent claims. Exemplary embodiments of the invention are illustrated in the drawings and are described in detail below. The drawings show:

[0013] Fig. 1. View of a plug connection with oval cross-section and seal for connecting two pipes;

[0014] Fig. 2 the side view from the left of the in Fig. 1 shown connector;

[0015] Fig. 3 the detail “X” from Fig. 1 on an enlarged scale and

[0016] Fig. 4 The view of a plug connection with oval cross-section and seal for connecting a pipe.

[0017] The embodiments shown in the drawing depict a molded part. 1 with an oval cross-section, at the ends of which a plug connection is formed. On the fitting 1 according to the exemplary embodiment according to the Fig. 1 and Fig. 2 are two seals 2 arranged near the end faces of the molded part 1 are arranged. On the mold 1 according to the exemplary embodiment Fig. 4 is simply a seal. 2 arranged.

[0018] With the molded part 1 according to the exemplary embodiment according to the Fig. 1 and Fig. 2. A connection can be made between two pipes (not shown) of a duct for air supply. The fitting 1 in the exemplary embodiment according to Fig. Fitting 4 is designed for connecting an oval pipe and serves to create a push-fit connection between the oval pipe and another component located in an air duct. This component could be, for example, a branch, a multi-junction box, an elbow, or the like. 1 has a groove 11 up. Adjacent to the groove 11 are transition pieces 12 trained to guide the ends of the pipes to be joined when assembled.

[0019] To the transition pieces 12 close paragraphs 13 on, which are stair-like in a ground 14 ends in which the seals 2 are arranged. The free ends of the reasons 14are crimped. This crimping creates a raised edge. 17 is the seal 2 on the mold 1 held clamped. The molded part 1 has two strongly rounded areas 15 open. The areas 15 are defined by unrounded – flat – areas 16 connected to each other. The fitting 1 It therefore has an oval cross-section. Due to the crimping. 17 is the stability of the molded part 1 especially in the unrounded areas 16 increased.

[0020] The seals 2 consist of a basic body 21 , which has a substantially rectangular cross-section. On the base body 21 is a first lip 22 shaped, perpendicular to the base body 21 is aligned. The Lippe 22 In the exemplary embodiment, it is located in the middle of the base body. 21arranged and is therefore located in the immediate vicinity of the crimped end of the fitting 1 Other positions are also possible.

[0021] Adjacent to the first lip 22 is a second lip 23 to the base body 21 molded onto one end of the base body 21 is arranged. In the exemplary embodiment, the lip 23 at the crimped end of the fitting 1 far side of the seal 2 planned. The second lip 23 is also perpendicular to the base body 21 aligned. The lips are clearly aligned. 22 , 23 different heights, with the second lip 23 has a greater height than the first lip 22 .

[0022] How the Fig. 1, Fig. 3 and Fig. As can be seen from point 4, the lip is already protruding. 22about the height of the crimped end of the fitting 1 This highlights the fact that the lip already provides a sealing function. 22 guaranteed. The provision of the second lip 23 This leads to a significant improvement in the sealing effect. Since the second lip 23 in addition, further over the crimped end of the fitting 1 In addition to its outstanding performance, the sealing function is further improved. This is due to the fact that the lip... 23 due to its height, it nestles against the inside of the pushed-on pipe.

[0023] Because of its greater height, the Lippe 23 Furthermore, it is able to compensate for unevenness in the pipe being pushed on, which occurs particularly in areas that are not rounded or only slightly rounded. This also applies if the pipe being pushed on has a relatively large width and therefore deflects in the areas that are not rounded or only slightly rounded.

[0024] The increased height of the second lip 23 It also has the advantage that the lip 23 In any case, the lip is folded over when the pipes to be joined are pushed together. This results in a flat, even contact surface. 23 to the inside of the pushed-on pipes, which further improves the seal.

[0025] The push-fit connection according to the invention provides a significantly improved seal for air ducts at the connection points between the pipe and the fitting used for air distribution. Due to the inventive design of the push-fit connection with seal, energy losses caused by the unintentional escape of air at the connection points between the pipe and the fitting are substantially reduced. This improves the energy efficiency of the respective ventilation or exhaust system. Furthermore, the sealing of the fittings to the pipes occurs immediately upon joining the parts, so no additional assembly time is required. The sealing according to the invention is therefore possible without increasing assembly time.

Claims

[1] Push-fit connection for connecting pipes with an oval cross-section, with at least one adapter ( 12 ) for receiving the pipes to be joined, to which a shoulder ( 13 ) connects, which is in a ground ( 14 ) ends, characterized by that in the reason ( 14 ) a seal ( 2 ) is arranged. [2] Plug connector according to claim 1, characterized by that the seal ( 2 ) in the reason ( 14 ) is held clamped. [3] Plug connector according to claim 2, characterized by that the clamping of the seal ( 2 ) in the reason ( 14 ) by a crimping ( 17 ) is caused. [4] Plug connector according to one or more of the preceding claims, characterized by that the seal ( 2 ) from a basic body ( 21 ) consists of which a first lip ( 22 ) is molded onto it. [5] Plug connector according to claim 4, characterized bythat adjacent to the first lip ( 22 ) a second lip ( 23 ) to the base body ( 21 ) is molded onto it. [6] Plug connector according to claim 5, characterized by that the second lip ( 23 ) at one end of the base body ( 21 ) is arranged. [7] Plug connector according to one or more of the preceding claims, characterized by that has two strongly rounded areas ( 15 ) are provided for, which are defined by unrounded areas ( 16 ) connected to each other, and between the unrounded areas ( 16 ) a rod is arranged.

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