WO2016137408A1

WO2016137408A1 - Connection device for flared pipe and method for same

Info

Publication number: WO2016137408A1
Application number: PCT/TR2015/000063
Authority: WO
Inventors: Orhan Tosun; Ozan Koyuncu
Original assignee: Orhan Tosun
Priority date: 2015-02-23
Filing date: 2015-02-23
Publication date: 2016-09-01
Also published as: DE112015006206T5

Abstract

Connecting device comprising a first pipe (2) having a flared end; a sleeve nut having an opening at each opposite ends thereof, a cavity, and a threaded portion at an inner circular wall thereof; a second pipe (3) having a flared end; a connector (4) having a frustoconical form at each opposite ends thereof, the frustoconical ends communicating with the flared ends of the first pipe (2) and the second pipe (3); and a sleeve screw (5) having a cavity for receiving the second pipe (3) and having threads (17) compatible with threads (16) of the sleeve nut at the outer surface thereof, the sleeve screw (5) providing pressure for the securing the connection, wherein the connector (4) is communicated with the first pipe (2) by means of a form-fitting pressure apart from the pressure of the sleeve screw (5).

Description

CONNECTION DEVICE FOR FLARED PIPE AND METHOD FOR SAME

TECHNICAL FIELD The present invention relates to a connecting device receiving therein a flared side of a flared pipe, the device having a sleeve; and the invention further relates to a method regarding the connection.

BACKGROUND OF THE INVENTION

Leakproof fluid transfer from a pipe, through which fluid passes, to other is provided generally by flared pipes. While end of one of the connected pipes is flared outward (male), end of the other is flared inward (female) and connection is provided by pressing pipes toward each other. The flared pipe connection is required to be excellent in some particular applications, in which especially if a high-pressure fluid transfer is in question. However, when pipes are pressed toward each other flared ends may be damaged in milimetric scale and this excellence expectation cannot be met all the time.

For a safer flared pipe connection, a connecting device, in which a circular connector having both cone-shaped ends is provided between two pipes, is used. Apart from flared pipes and connector, sleeve nut and sleeve screw so as to fix the connection are used in a such connection. Basically, this connection provides a leak-proof connection by means of inserting the first pipe to sleeve such that flared end will remain in the sleeve nut, inserting the connector within the sleeve nut and then compressing the second pipe being passed through the sleeve screw by virtue of a screw.

In a facility churning out, e.g. a facility where flared brake pipes are assembled for the automobiles, assembly of the abovementioned mechanism may increase the production cost. That is to say, that the first pipe is inserted to sleeve nut and then the connector is produced by means of a separate assembly step cause loss of time and labor power. To overcome such disadvantage, US 2014/0125056 suggest a solution where threads which are compatible with the threads opening to the inner surface of the sleeve nut are formed on the outer side of the connector. Thus, after the first pipe is passed through sleeve nut, the connector is inserted in the nut by being transferred over the threads of the sleeve nut and, in turn, it is not possible that the connector displaces from the sleeve nut (due to threads of the sleeve nut). With this configuration, the structure containing the first pipe, the sleeve nut and the connector is transferred to the next assembly phase and there, it is possible that second pipe is inserted together with the sleeve screw. However, US 2014/0125056 has a disadvantage in that it comprises an additional assembly phase such as forming a thread to the outer side of the connector.

On the other hand, based upon the aforementioned disadvantage of the US 2014/0125056, the Document No. DE 20 2014 101 748 offers a structure containing several bows which extend inward on the inner circular surface of the nut radially. Here, the connector has also a circular protrusion extending partially along the width thereof. According to the Document No. DE 20 2014 101 748, after the first pipe is inserted to the sleeve nut, the connector is released in the sleeve nut by being turned from the curved sections. In this case, the connector cannot displace from the sleeve nut since the circular protrusion of the connector cannot pass over the backward curved sections and the structure containing the first pipe, the sleeve nut and the connector is transferred to the next assembly phase and there, it is possible that second pipe is inserted together with the sleeve screw.

The disadvantage of DE 20 2014 101 748 arises from the fact that the first pipe, the connector and the sleeve nut cannot be fixed together during the sub-assembly. The fact that these parts and the second pipe are fixed together at the final phase shows that the assembly must be conducted in more suitable conditions. That is because at the final stage during the fixing of all parts together the first pipe, the connector and the second pipe must be uniformly coaxial and flared ends of the first pipe and second pipe are required to undertake angular elastic deformation (for instance, while before the assembly they had 115^° cone angle, after the connector was compressed it is desired that they have a value e.g. 120 ), otherwise sealing safety will be damaged. In fact, this disadvantage regarding DE 20 2014 101 748 is also valid for US 2014/0125056, thus in this solution the connector, to the external outer side of which a thread is formed, the first pipe and the sleeve nut are also not fixed together at the sub-assembly phase.

BRIEF DESCRIPTION OF THE INVENTION

The object of the present invention is to provide an efficient flared pipe connection. Another object of the present invention is to provide a low-cost flared pipe connection. The present invention relates to a connecting device comprising a first pipe having a flared end; a sleeve nut having an opening at each opposite ends thereof, a cavity, and a threaded portion at an inner circular wall thereof; a second pipe having a flared end; a connector having a frustoconical form at each opposite ends thereof, the frustoconical ends communicating with the flared ends of the first pipe and the second pipe; and a sleeve screw having a cavity for receiving the second pipe and having threads compatible with threads of the sleeve nut at the outer surface thereof, the sleeve screw providing pressure for the securing the connection, wherein the connector is communicated with the first pipe by means of a form-fitting pressure apart from the pressure of the sleeve screw.

According to an embodiment of the invention, the form-fitting pressure is obtained by means of pounding the connector in the sleeve nut.

BRIEF DESCRIPTION OF THE FIGURES

The present invention should be evaluated with the figures described below to ensure the best understanding of the embodiment and advantages together with the additional elements of the invention. Figure 1 illustrates the cross-sectional view showing that the connector advances towards flared first pipe within the sleeve nut in pipe connecting device according to the invention.

Figure 2 illustrates the cross-sectional view after the connector is pounded in flared first pipe within the sleeve nut in connecting device according to the invention.

Figure 3 is the cross-sectional view of the pipe connecting device according to the invention after the assembly of the second pipe is completed.

DETAILED DESCRIPTION OF THE INVENTION

As seen in Figure 1 , the pipe connecting device according to the invention comprises a first pipe (2) and a second pipe (3), whose end sections to be connected are flared; a connector (4) arranged between the flared pipe ends has at least a partially circular form; a sleeve nut (1) encapsulating the connector (4) and the flared pipe ends; and a sleeve screw (5) securing the device. The sleeve nut (1) has preferably a cylindrical form and an opening at each opposite end section in the axial direction for the entry of the flared pipes (2,3) therein. At the inner section of the sleeve nut (1) there is a circular cavity (10) extending in the axial direction. Sleeve cavity (10) comprises a threaded cavity section (11), in which threads (16) are formed at the inner circular wall thereof; and an unthreaded cavity section ( 2) which is coaxial therewith and has a smaller diameter than thereof.

The first pipe (2) is inserted from the non-flared end thereof into the sleeve nut (1 ) through the threaded cavity section (11 ) and it extends through the outside of the sleeve nut (1) through the unthreaded cavity section (12). The opening at the unthreaded section (12) is dimensioned such that back surface (6) of the flared first pipe (2) cannot displace from this opening and sleeve nut (1) of this opening leans on the flange defined at inner surface. Thus, flared end of the first pipe (2) settles in the unthreaded cavity section (12). The connector (4) is communicated with the cone-shaped front surface (7) of the flared end of the first pipe by means of applying form-fitting pressure. For achieving this, the connector (4) is advanced first through the threaded cavity section (11) of the sleeve nut and then through the unthreaded cavity section (12).

The diameter of the connector (4) is smaller than inner diameter of the threaded cavity section (11) and slightly bigger than the diameter of the unthreaded cavity section (12). Thus, the connector (4) advances through the threaded cavity section (11 ) axially without contacting the sleeve nut threads (16) and when coming to unthreaded cavity section (12), it is advanced axially by force, preferably by being pounded. Thus, the connector (4) is communicated with the sleeve nut (1) by means of form-fitting pressure in the unthreaded cavity section (12). Within the scope of this description, it should be understood by the term "form-fitting" that the connector (4) does not make relative motion when a force is not applied onto the connector (4).

The connector (4) is pounded through the axial direction of the sleeve nut and advanced to the front surface (7) of the flared end of the first pipe in the unthreaded cavity section (12) and since both opposite ends of the connector (4) have cone-shaped reclining surfaces (13,14), the first reclining surface (13) applies pressure such that preferably it increases the cone angle of the flared slightly (for instance, while it has a cone angle by 115^° before the assembly, this cone angle reaches a value such as 120^' with the pressure of the connector), in this case, back surfaces (6) of the first pipe flared end also lean on the flange defined at inner surface of the sleeve nut (1) in the opening of the unthreaded cavity section (12). Optionally, the connector (4) can be located in a way that it does not change the cone angle of the first pipe flared, e.g. such that it will contact with the flared slightly.

Preferably a pin (15) is used to pound the connector (4) through the unthreaded cavity 5 section (12). For achieving this, after being passed through the cavity Iocated at the center of the connector (4), the pin end (19) is driven through the unthreaded cavity section (12) along the axis of the sleeve nut (1). Cone-shaped reclining surface (14) on the other side of the connector (4) is fitted coherently with the cone-shaped surface (20) behind the pin end (19).

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The distance required for the pin (15) to advance axially can be controlled variously. For instance, the pin (15) can be advanced by means of a servo control unit that moves axially. As it is, in case the connector (4) is available on the pin (15), when the same meets an opposite force (i.e. force occurring by contacting the first pipe flared) this force ] 5 can be referenced by the servo system and then advanced at a certain distance from this point. Alternatively, only position-based processing can be made and in this case the distance to which extent that the pin (15) will advance according to the size of the parts is calculated and then the pin (15) can be advanced at designated amount in accordance with this calculation.

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The connector (4) diameter is slightly bigger than the unthreaded cavity section (12) in a manner to be suitable for being pounded and advanced in the unthreaded cavity section, for example, the size difference can be a value from 0.02 to 0.5 mm. 5 In a preferred embodiment of the invention, the connector (4) is made of a softer material than the sleeve nut (1). This would be required for preventing harming the threads (16), when the connector (4) enters into the sleeve nut (1) through the threaded cavity section (11) and hit the threads (16).

30 When the connector (4) is connected to the front surface (7) of the first pipe flared end, the sleeve nut (1), the first pipe (2) and the connector (4) together exhibit a form-fitting configuration. This configuration is moved to another operation step where the connection of the second pipe (3) is conducted. At this step, the second pipe passes through an opening (21 ) along the axis of a sleeve screw (5) in a way that flared front surface (9) 5 thereof leans on the cone-shaped second reclining surface (14) of the connector (4), and extends to the sleeve nut opening (10). The second pipe (3) is passed through the sleeve screw (5) in a way that the flared back surface (8) thereof leans on the sleeve screw end (18).

The sleeve screw (5) comprises threads (17) that open along the body thereof and run in accordance with the sleeve nut threads (16). After the sleeve screw body and the second pipe flared ends are together inserted into the sleeve nut cavity section with thread (11 ), the sleeve screw threads (17) are screwed over the sleeve nut threads (16) and thereby the connection is provided. The torque value for which the sleeve screw will be compressed may change according to the field where the connection is applied and it is possible that this value is suited to a previously known standard value. The specified torque value of the sleeve screw (5) is at a grade such that the second reclining surface (14) of the connector slightly increases the cone angle of the second pipe flared end (for instance, while it has a cone angle by 115^° before the assembly, this cone angle reaches a value such as 120^° with the pressure of the connector).

Claims

A connecting device comprising a first pipe (2) having a flared end; a sleeve nut (1) having an opening at each opposite ends thereof, a cavity (10), and a thread portion (16) at an inner circular wall thereof; a second pipe (3) having a flared end; a connector (4) having a frustoconical form (12,13), the frustoconical ends communicating with the flared ends of the first pipe (2) and the second pipe (3), the connector (4) further having at least a partially circular form; and a sleeve screw (5) having a cavity (21) for receiving the second pipe (3) and having threads (17) compatible with the sleeve nut threads (16) at the outer surface thereof, the sleeve screw (5) providing pressure for securing the connection, wherein the connector (4) is communicated with the first pipe (2) by means of a form-fitting pressure apart from the pressure of the sleeve screw (5).

The connecting device according to the Claim 1 , characterized in that said form- fitting pressure is obtained by pounding the connector (4) through the sleeve nut (1).

The connecting device according to the Claim 1 , characterized in that the sleeve cavity (10) comprises a threaded cavity section (1 1 ) having threads (16) on the inner circular wall thereof; and an unthreaded cavity section (12) being coaxial therewith and having a smaller diameter than thereof.

The connecting device according to the Claim 3, characterized in that the diameter of the connector (4) is smaller than the inner diameter of the threaded cavity section (11) and slightly bigger than diameter of the unthreaded cavity section (12).

The connecting device according to the Claim 4, characterized in that the diameter of the connector (4) is 0.02 to 0.5 mm bigger than the diameter of the unthreaded cavity section (12).

The connecting device according to the Claim 1 , characterized in that the connector (4) is made of a softer material than the sleeve nut (1).

The connecting device according to the Claim 2, characterized in that the connector (4) is pounded such that the cone angle of the connector slightly increases the cone angle of the flared end of the first pipe. A method for connecting a first pipe (2) and a second pipe (3), wherein the first pipe (2) and the second pipe (3) each having a flared end communicating with a connector (4) for the connection in a sleeve nut (1) comprising a cavity (10) by means of sleeve screw (5), characterized by comprising the step of communicating the connector (4) with the first pipe (2) by means of a form-fitting pressure apart from the pressure of the sleeve screw (5).

The method according to the Claim 8, characterized in that said form-fitting pressure is obtained by pounding the connector (4) through the sleeve nut (1).

The method according to the Claim 9, characterized in that the connector (4) is pounded to the relevant pipe such that the same slightly increases the cone angle of the flared end.