COMPRESSION-TYPE FITTING FOR CONNECTING PIPES TO HYDRAULIC OR PNEUMATIC COMPONENTS OR FOR CONNECTING PIPES TOGETHER, PARTICULARLY FOR REFRIGERATION SYSTEMS

Abstract

A compression-type fitting for connecting pipes to hydraulic or pneumatic components or for connecting pipes together, particularly for refrigeration systems, comprising a fitting body provided with a male thread adapted to be engaged by a female thread of a locking nut, an ogive being interposed between the locking nut and the fitting body, a sealing gasket being provided between the ogive and the fitting body, the ogive being adapted to adhere to the external surface of a pipe to be connected; the locking nut has an internal taper such as to deform, during the tightening action, the ogive and produce a constriction thereof on the pipe to be connected.

Claims

1. A compression-type fitting for connecting pipes to hydraulic or pneumatic components or for connecting pipes together, particularly for refrigeration systems, comprising a fitting body provided with a male thread adapted to be engaged by a female thread of a locking nut, an ogive being interposed between said locking nut and the fitting body, a sealing gasket being provided between said ogive and said fitting body, said ogive being adapted to adhere to the external surface of a pipe to be connected, wherein said locking nut has an internal taper such as to deform, during the tightening action, said ogive and produce a constriction thereof on the pipe to be connected.

2. The compression-type fitting according to claim 1, wherein said locking nut deforms, as a consequence of the screwing onto said body, the end of said ogive that adheres to said pipe to be connected, deforming it.

3. The compression-type fitting according to claim 1, wherein said locking nut, once tightening has occurred, locks against a mechanical abutment formed at the body of said fitting.

4. The compression-type fitting according to claim 1, wherein at the end of the tightening process the inside diameter of said ogive, when pressure of the locking nut is applied thereto, is always constant.

Description

[0056] Further characteristics and advantages of the invention will become better apparent from the description of a preferred but not exclusive embodiment of the compression-type fitting according to the invention, illustrated by way of non limiting example in the accompanying drawings, wherein:

[0057] FIG. 1 is an exploded view of a compression-type fitting of the known type;

[0058] FIG. 2 is a longitudinal sectional view of the compression-type fitting according to the present invention;

[0059] FIG. 3 is a longitudinal sectional view of the compression-type fitting according to the present invention in the condition for connecting two pipes;

[0060] FIG. 4 is a partial longitudinal sectional view of a detail of the compression-type fitting according to the present invention.

[0061] With reference to the figures, the compression-type fitting according to the invention, designated generally by the reference numeral 10, comprises a fitting body 1 which has a male threaded end la with which a locking nut 2 engages by means of a female thread thereof.

[0062] The fitting body 1 has, on the same side as the thread, a seat for the accommodation of a pipe 6 to be connected and a seat for a sealing gasket 4.

[0063] The male thread 1d of the fitting body 1 has a threaded portion that is shorter than fittings of the standard type. As mentioned, the nut screws onto the thread portion and, once tightening is complete, the nut stops against a mechanical abutment 15 formed on the body 1 of the fitting.

[0064] In the case of straight parts, the abutment is a hexagonal key that is present at the center of the fitting body.

[0065] Conveniently, the nut 2 is contoured internally with a taper 16 and the locking of the nut produces, as a consequence of this internal taper, the constriction of an ogive 3 that is accommodated in contact with the body 1 of the fitting, thus compressing the gasket 4, and is adjacent to the pipe 6 to be connected.

[0066] The constriction of the ogive 3 therefore occurs by means of the nut 2 against the pipe to be connected.

[0067] The constriction of the ogive, for each pipe reference, is always the same, i.e., the inside diameter of the ogive at the end of the tightening is always constant.

[0068] The controlled constriction of the ogive diameter allows to retain the pressurized pipe inside the fitting without however damaging the pipe itself, which is therefore assembled without a reinforcement bushing.

[0069] The pressure seal is assigned, as in the background art, to the O-ring gasket 4.

[0070] In practice it has been found that the compression-type fitting according to the invention achieves the intended aim and objects, since it allows to avoid the internal bushing, and this therefore does not cause a reduction of the flow rate of the fitting.

[0071] Furthermore, the operating pressures are lower than a fitting complete with a reinforcement bushing, since said fitting is applied to small-diameter pipes, and in any case higher levels than those usually provided for fittings of the known type are maintained.

[0072] Furthermore, it is to be noted the absence of a reinforcement bushing as well as the difficulty of inserting it inside the pipe. The difficulties that can occur in the case of pipes with an ovalized or nonstandard inside diameter are therefore overcome.

[0073] The fitting thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.

[0074] All the details may furthermore be replaced with other technically equivalent elements.

[0075] In practice, the materials used, as well as the contingent shapes and dimensions, may be any according to the requirements and the state of the art.