DE102010045400A1 - Pipeline for use in refrigerant circuit of refrigerator, has adhesive and/or seal arrangement provided in connection region between two pipes, where end regions of both pipes are connected by press connection - Google Patents

Abstract

The pipeline has two pipes (10, 20) connected with each other in a connection region. An end region of one of the pipes is introduced into an end region of the other pipe at the connection region. An adhesive and/or seal arrangement (50) is provided in the connection region between the pipes, and the end regions of both the pipes are connected by press connection. A projection i.e. squeezing plate, and a recess i.e. groove, formed by the press connection are provided in the respective end regions of the pipes. The pipes are made of same or different material e.g. aluminum, copper and steel. An independent claim is also included for a method for manufacturing a pipeline.

Description

The present invention relates to a piping having a first and a second tube communicating with each other in a connection portion, wherein in the connection portion, an end portion of the first tube is inserted into an end portion of the second tube.

From the prior art, various ways of connecting two pipes are known. In addition to the possibility of welding or soldering or the like, the use of so-called Lokring connections is also known. These include a spigot into which the ends of the two pipes to be connected are inserted. Subsequently, press rings are pushed over the outside of the nozzle sections, in which the pipe ends are accommodated. Due to a special geometry of the inner sides of the press rings, the nozzle sections are firmly clamped on the tube outer sides, whereby a hermetically sealed connection between the two tubes is made.

The present invention has the object of developing a pipeline of the type mentioned in that the connection between two pipes in a simple manner can be produced.

This object is achieved by a pipeline having the features of claim 1.

Accordingly, it is provided that in the connection region between the first and the second tube, an adhesive and / or a sealant is located and that the end portions of both tubes are connected by a press connection. Such a connection of two tubes has the advantages that it is reliable, that it is easy to produce, wherein the tubes can be made of the same or different materials and that the assembly can be carried out easily and quickly.

It is preferably provided that only the named adhesive and / or the said sealant are used as additive or as an aid and that the pressing rings known from the prior art are dispensed with.

The piping or connection technology according to the invention can be used both in the new production of pipelines and in case of repair.

In a preferred embodiment of the invention, it is provided that one or both of the tubes are deformed by the press connection in such a way that they are rotationally fixed to one another in the connection region by positive engagement.

Alternatively or additionally, it may be provided that a frictional connection is generated by the pressing force.

This rotation can be performed differently, z. B. in the form of a polygonal, such as hexagonal design, flat, oval, etc.

The anti-rotation has the advantage that during the curing of the adhesive and / or the sealant relative rotation of the tubes is prevented from each other. Preferably, the positive and / or non-positive connection between the tubes is alternatively or additionally designed so that a relative movement of the tubes is prevented in the axial direction.

As stated above, it is preferably provided that the pipeline in the connection region has no further connection means, in particular no pressing ring and / or no welded or soldered connection. In a particularly preferred embodiment, it is provided that the adhesive and / or the sealing compound is used as the sole additive, resulting in a comparatively cost-effective production of the compound or the pipe as a whole.

The pipe or connection technology according to the invention makes it possible to connect two pipe ends made of the same or different materials. Considered, for example, aluminum, copper, steel, etc, or other metals or materials not explicitly mentioned here.

In the field of refrigeration equipment, for example, aluminum / aluminum or copper / aluminum pipe connections are conceivable, and this list is not exhaustive.

In the connection area, one or different embodiments of positive connections may be present.

Thus, it is conceivable, for example, that the tubes are connected to one another in such a positive and / or non-positive manner that they can not be rotated relative to one another.

It is also conceivable to design the positive and / or non-positive connection so that a relative movement of the tubes relative to one another in the axial direction of the tubes is not possible.

Also, several different anti-rotation serving positive and / or non-positive connections are conceivable. The same can apply for securing the pipes against relative movement in the axial direction.

Preferably, in the end region of the one tube in the connection region at least one projection, in particular a formed by the press connection Quetschlasche is provided which is received in a recess, preferably in a formed by the press connection groove, the end portion of the second tube, wherein the projection and the Recess are arranged so that they form an anti-rotation of the tubes and / or securing the tubes against axial relative movement.

In a further embodiment of the invention, it is provided that the adhesive and / or the sealing compound is arranged in a region between the outer circumference of the first tube and the inner side of the second tube and / or that the adhesive and / or the sealing compound is arranged in the region, in which the tubes are connected by the press connection.

As an adhesive or as a sealant, for example, the material Lokprep into consideration. This is an anaerobic fluid containing dimetacrylate ester. It is conceivable to wet one or both of the pipe ends with this adhesive or with another adhesive or sealant and then apply said pressing force to produce a preferably hermetically sealed or gas and / or liquid-tight connection region.

Preferably, the adhesive or the sealant is designed so fluid that it can penetrate into voids or cavities, resulting in a particularly dense connection.

Preferably, the adhesive or the sealing compound comprises or consists of an anaerobic liquid which comprises, for example, dimetacrylate esters. It flows in voids of the pipes, whereby an improved seal is achieved.

Preferably, it is further provided that the adhesive and / or the sealant solidify over time or cure after a certain period of time.

Preferably, the adhesive or the sealant is designed so that the solidification or curing is possible without solvents would have to volatilize.

The present invention further relates to a method for producing a pipeline having a first and a second tube, which communicate with one another in at least one connection region, the method comprising the following steps: inserting an end region of the first tube into an end region of the second tube, wherein in at least one region between the first and second tube an adhesive and / or a sealant is or is arranged and applying a pressing force, preferably by a pair of pliers, on the outside of the second tube, such that the end portions of both tubes by a press connection connected to each other.

Preferably, the method is carried out so that one or both of the tubes are deformed during application of the pressing force such that they are rotationally fixed in the connection region by positive engagement or by force fit and / or in the axial direction with each other.

The present invention further relates to a cooling device with at least one pipe according to one of claims 1 to 7 and / or with at least one pipe produced by a method according to claim 8 or 9. For example, it is conceivable that the pipeline according to the invention is a pipeline of the refrigerant circuit of a refrigerator and / or freezer. For example, connections between pipelines of the refrigerant circuit with components of the refrigerant circuit, such as the capillary tube, the compressor suction tube, etc. come with further tubes or connecting pieces.

The term "pipe" according to the present invention, a conventional pipe or a nozzle, fitting to understand the like, which is to be connected by means of the inventive technique.

Further details and advantages of the present invention will be explained with reference to an embodiment shown in the drawing. Show it:

1 FIG. 3 is a perspective view of a pipe joint according to the present invention, with a longitudinal section, FIG.

2 a side view of the pipe connection according to the invention with a cross-sectional view,

3 a cross section through the pipe joint in the connection area and

4 : A pair of pliers for making the press connection between both pipes in the closed and in the open state.

1 shows a perspective view of the pipe joint according to the present invention. The illustrated connection area shows a first tube 10 , with its end portion in the diameter-enlarged range 21 a second tube 20 is introduced. Both tubes can be made of the same material or of different materials. For example, aluminum, copper, steel, etc. come into consideration.

Before inserting the pipe end 10 in the enlarged recording area 21 of the second pipe end 20 is between the outer circumference of the pipe end 10 and the inner circumference of the area 21 applied an adhesive and / or a sealant, which is preferably designed such that it is flowable. This has the advantage that can be compensated by the adhesive or by the sealant cavities or roughness to the effect that a tightness of the pipe joint is guaranteed. The adhesive or the sealant may be a flowable or otherwise, for. B. act by spraying applied fluid.

Preferably, the adhesive or sealant is designed so that it / they cure after a certain period of a few minutes, for example in the period of 5 to 10 minutes.

By the in 4 illustrated pliers 60 is then, ie after the application or introduction of the adhesive or the sealant on the outside area 21 of the pipe 20 exerted a pressing force, which is both the first tube 10 as well as the second pipe 20 squeezes and deforms, like this 1 is apparent.

Through the pliers 60 be different grooves or folds in the pipes 10 . 20 introduced, wherein in the embodiment shown here one of the deformations 30 multi-surface and exemplary in the form of the outer surface of a nut is executed and two other deformations 40 are designed in the form of grooves extending in the circumferential direction of both tubes 10 . 20 extend, as in particular from the sectional view according to 1 evident.

From the sectional view according to 1 Furthermore, the arrangement of the adhesive or the sealant is recognizable, which there by the reference numeral 50 is marked. It extends into the connecting region of both tubes between the outer circumference of the inner first tube 10 and the inner periphery, the second, outer tube 20 respectively. 21 ,

Like this further 1 shows, is the positive connection of both tubes 10 . 20 designed so that a movement in the axial direction is excluded.

Furthermore, the deformation is also designed so that an anti-rotation is achieved. This also results in particular 2 , which shows a side view and a cross-sectional view in the region of the multi-surface folds according to section BB. It can be seen that both tubes 10 . 20 in this area 30 polygonal in cross-section, hexagonal shaped in the example, which is achieved by the externally applied pressing force. The section 30 thus provides an anti-rotation. This anti-rotation bring with it the advantage that the adhesive or the sealant can cure easily, without causing a relative movement of both tubes 10 . 20 comes.

3 shows a schematic representation of a cross-sectional view of both tubes in the region of the grooves 40 , Here it can be seen that by applying a pressing force both in the outer tube 20 as well as in the inner tube 10 each outwardly projecting squeezing tabs are generated, which extend obliquely in the longitudinal direction of the tubes or even to the longitudinal direction of the tubes, wherein the squeeze of the inner tube 10 in the inner groove of the squeeze of the outer tube 20 is included. This also an anti-rotation is achieved.

4 shows a possible embodiment of a pressing tongs for generating the deformations of the Rohrendbereiche shown.

After insertion of the first tube 10 in the second tube 20 and the introduction or application of the adhesive or the sealant is the arrangement in the connection region, ie in the region of the nozzle 21 in the pliers 60 introduced and the jaws of the pliers manually or mechanically merged, which in the 1 to 3 formed deformations arise.

Preferably, the compound according to the present invention is gas-tight and / or liquid-tight.

This preferably also applies to higher pressures and particularly preferably to pressures which occur in a refrigerant circuit of the refrigerator and / or freezer.

The invention is suitable, for example, for hermetically sealed pipe connections, such as those present in a refrigerant circuit of a refrigerator and / or freezer.

Claims (10)

Pipe having a first and a second tube, which communicate with each other in a connection region, wherein in the connection region, an end portion of the first tube is inserted into an end portion of the second tube, characterized in that in the connection region between the first and second tube an adhesive and / or a sealant is located and that the end portions of both tubes are connected by a press connection. Pipe according to claim 1, characterized in that one or both of the tubes are deformed in such a way that they are rotationally fixed to one another in the connecting region by positive locking and / or by frictional connection. Pipe according to claim 1 or 2, characterized in that the pipe in the connecting region no further connecting means, in particular no pressing ring and / or no cohesive connection, such as a welded or soldered connection. Pipe according to one of the preceding claims, characterized in that the first tube consists of a different or the same material, such as the second tube, and / or that in the connection region different versions of positive and / or non-positive connections are present. Pipe according to one of the preceding claims, characterized in that in the end region of the first tube at least one projection, in particular a squeeze formed by the press connection is provided in a recess, preferably in a formed by the press-fit groove, the end portion of the second tube is received, wherein the projection and the recess are arranged so that they form an anti-rotation of the tubes. Pipe according to one of the preceding claims, characterized in that the positive and / or non-positive connection between the two pipes achieved by the pressing force is designed such that a relative movement of the pipes in the axial direction is prevented. Pipe according to one of the preceding claims, characterized in that the adhesive and / or the sealant is disposed in a region between the outer periphery of the first tube and the inside of the second tube and / or that the adhesive and / or the sealant disposed in the region is, in which the tubes are connected by the press connection. A method of manufacturing a pipeline having first and second pipes communicating with each other in at least one joint region, characterized in that the process comprises the steps of: inserting an end region of the first pipe into an end region of the second pipe; at least one area between the first and second tube, an adhesive and / or a sealing compound is located or arranged, and applying a pressing force, preferably by a pair of pliers, on the outside of the second tube, such that the end portions of both tubes connected by a press connection become. A method according to claim 9, characterized in that one or both of the tubes are deformed during application of the pressing force such that they are rotationally fixed in the connection region by positive engagement and / or by frictional connection and / or in the axial direction with each other. Cooling appliance with at least one pipeline according to one of claims 1 to 7 and / or with at least one pipeline produced by a process according to claim 8 or 9.

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