DE102005042447A1 - Assembly fitting with armature actuating rod assembly and cylindrical coupling sleeve made of fiber-reinforced polyamide and with inner recesses, to couple armature to rod assembly - Google Patents

Abstract

Assembly fitting has actuating rod assembly and plastic coupling sleeve (30) consisting of fiber-reinforced polyamide which couples gas or water armature to the rod assembly. Coupling sleeve consists of glass-reinforced polyamide with long glass fibers in a ratio of 30% to 70%, or in a ratio of 40% to 60%. It has a cylindrical body with circular diameter and two connecting surfaces (32,33) vertical to the cylinder axis. Symmetrical to the cylinder axis of both connecting surfaces, polygonal recesses (35,36) are put into the interior of the sleeve.

Description

The The invention relates to a mounting kit with a Armaturenbetätigungsgestänge and a dome sleeve, which a gas and / or water fitting with the Valve actuation linkage couples.

water pipes for drinking water, other supply and waste water, gas pipelines and other domestic supply lines be regularly below the earth's surface laid. They have fittings, for example as domestic connection fittings, which occasionally operated Need to become and therefore placed in a shaft to be accessible. The fittings indicate actuation on its top a square on, by the rotation of the Faucet closed or opened can be used to measure the flow of the corresponding fluid in the To enable management.

At the square is a tap actuation rod with a key rod from a mostly square steel tube connectable, since the square itself at a distance of 1 to 2 m below the earth's surface in the usually quite narrow shaft and thus comparatively by the operator difficult to reach. At the bottom of the key bar is a common one Made of cast steel existing adapter provided on the square fits and is called a dome sleeve. The valve actuator linkage can then put on the square by the operator from the earth's surface become. By means of a rotary motion of one located above the earth's surface Point off, the valve actuator linkage is rotated and thus transmit the rotary motion on the square become. It is also known to make the valve actuation linkage telescopic.

Problematic It is because of the tap actuation linkage that may be located above the earth's surface Temperatures below freezing point by means of a cold bridge transfer the valve can be. Especially with water pipes thereby the risk is increased that it to freeze these already less protected pipe sections can come. Through the square steel tube and the cast steel existing dome sleeve, the cold is then directly over the Square introduced into the fitting, which is just at this vulnerability especially dangerous is.

In the DE 202 17 513 U1 Therefore, it is proposed to interrupt the cold bridge by the area of the Armaturenbetätigungsgestänges, which is placed on the square, consists of an unspecified fiber-reinforced plastic with a very low coefficient of thermal conductivity. This should not only interrupt the cold bridge, but also give the required strength to absorb and transmit the forces or torques of up to 300 Nm and more when turning the Armaturenbetätigungsgestänges.

The transition region from the valve actuation linkage to the square is, as mentioned, usually formed by a dome sleeve adapter made of cast steel. Coupling sleeves made of plastic, with which so cold bridges can be prevented, have long been known, for example from the DE 81 20 862 U1 , There, the use of thermosetting plastic is proposed. However, this has the disadvantage that the dome sleeves are no longer shock and space, especially if they are made of the preferred material polyurethane rigid foam.

From the DE 44 38 205 C2 is a Schnellspannkuppelmuffe known in which a steel tube in the form of a steel skeleton over the length seen a plurality of openings. The steel skeleton with its interruptions is then embedded in a plastic body. This solution can still lead to cold spots and is also quite expensive.

An improved solution to this suggests, inter alia, the DE 20 2004 009 931 U1 before, in which the connecting sleeve is formed at least two shells with an outer sleeve and an inner sleeve, wherein the inner sleeve is received in the outer sleeve substantially torsion-free. In the plastic, glass fibers or carbon fibers are proposed as the reinforcing material to further increase the strength.

Composite coupling sleeves made of several materials are also from the DE 202 19 370 U1 known. There is proposed as a cladding tube, a metallic material or a reinforced or non-reinforced plastic with high tensile strength for such a dome sleeve, ultimately so a steel sleeve with plastic core.

All proposed forms for However, not purely metallic coupling sleeves have in practice not yet enforced, either because of the strength and practicality Doubts existed or a rational production was not possible.

Nevertheless it still remains desirable Alternatives to the conventional ones and in practice exclusively used dome sleeves made of cast steel.

The object of the invention is therefore, one of to propose like coupling sleeve.

These Task is characterized by a generic installation set solved, that the coupling sleeve is made of a fiber-reinforced polyamide.

With such a choice of material leaves the problem is surprising to solve. A fiber reinforced Polyamide is on the one hand able to build up cold bridges Avoid and thus prevent temperatures below freezing in drinking water pipelines over Transfer built-in trims become.

It There is a thermal decoupling of the shut-off valve for Armaturenbetätigungsgestänge and vice versa. By the particular compared to cast iron essential lower thermal conductivity becomes the heat transfer especially in the range of temperatures below 0 ° C in time significantly delayed or prevented.

By the whole Avoidance of metal components in the coupling sleeve receives this very advantageous electrostatic properties. Through this will about that In addition, it also ensured that no live or live transmission options or sparking occur. Although this is less for water pipes, but for that a problem for gas suppliers. The danger of sparking during Attaching the dome sleeves to the square edge on the fittings of the gas lines is complete avoided; about that can out also no electrically conductive Connections arise more from the earth's surface to the pipelines, possibly getting dangerous can, if accidentally touched power lines or incorrect operation in the Area of the street cap be made.

It thus creates a complete electrical decoupling of the valve from the street cap; the risk of sparking and the risk of explosion in gas pipes is minimized.

One another big one Advantage of the material lies in its easy procurement and easier processing. Cast steel is both of the manufacture, as well as with regard to the environmental requirements and the material price problematic.

With the choice of material according to the invention, namely fiber-reinforced, preferred By means of long glass fibers fiber-reinforced polyamide plastic is but now also achieved a sufficient strength of the coupling sleeves. The material is broken and impact-resistant and also to a high degree temperature resistant, so it can also be used at temperatures well below freezing become.

Especially it is preferred if the coupling sleeve made of a glass fiber reinforced polyamide with Long glass fibers in a proportion between 30% and 70%, in particular between 40% and 60%.

Just the appropriate choice of material allows it about it In addition, an optimal design of the coupling sleeve of a built-in set to choose. This is characterized by the fact that the coupling sleeve a cylindrical body with circular Has cross-section and two perpendicular to the cylinder axis end surfaces, and that polygonal symmetrical to the cylinder axis of both end surfaces Recesses are guided in the interior of the dome sleeve.

It so creates a load-adapted design of the dome sleeve with a form-fitting Connection at the connection sides or end surfaces. Thereby can be guaranteed be that sufficient power transmission is possible.

Of the Cylinder consists primarily of solid material. This will be on rejected in the professional world, because solid material at a higher cost and to higher weight leads and in the case of cast steel, of course, beyond that also the transmission of temperatures.

at the choice of material according to the invention however, these factors do not matter; the solid material reinforces straight nor the stabilizing function of long glass fibers, the strength the dome sleeve gives special expression.

at the same time The result is a positive fit between the elements square, Coupling sleeve and key rod, which leads to, that the torque in the range up to 200 Nm and 300 Nm transferable becomes. It turned out that with the dome sleeve now even the key bar the more sensitive part in transmitting of the torque is.

In a preferred embodiment is further provided that perpendicular to the axis of the coupling sleeve Drilling from the outside are provided in the coupling sleeve. Through an integration of holes The sides of the dome sleeve can split pins and other fastening or securing elements are attached and so the linkage respectively secure the valve.

in the Below is an embodiment of the invention with reference to the drawing explained in more detail. It demonstrate:

1 a schematic section through a shaft with inserted therein inventive installation set;

2 an enlarged view of a coupling sleeve in partially translucent reproduction; and

3 a sight of the dome sleeve 2 from the outside.

In the 1 the overall situation is shown schematically, in which the installation kit according to the invention is in the position of use. You can see a shaft 11 within the soil 12 , The soil 12 reaches up to the earth's surface 13 , From the ground 12 from the side into the shaft 11 horizontally into and out of this again leads out a pipeline 14 , Inside the shaft 11 points the pipeline 14 a fitting 15 on, which is shown here only schematically. The valve can be used to stop the flow of fluid through the pipe 14 but it may also restrict or regulate the flow through a branch or serve for other purposes. For this purpose, has the fitting 15 a thread 16 , in an unillustrated mating thread of the fitting 15 can be screwed in and out. On the thread 16 is a square at the top 17 to recognize.

Outside the period of use of the installation kit, this is not in the shaft 11 ; in this case, only the square sticks out 17 upwards unused.

To operate the valve, for example, to stop or to allow the flow, the square must 17 and therefore the thread 16 to be turned around. As the user above the earth's surface 13 located and the shaft 11 usually too tight to get in, is a built-in equipment 20 used. This installation kit 20 has a sleeve tube 21 and an actuator 22 on, above the surface of the earth 13 is accessible. The actuator 22 is with a valve actuation rod with a key rod 23 connected within the sleeve tube 21 runs and consists essentially of a square steel tube. The square steel tube of the key bar 23 ends down with a square.

To work with the actuator 22 over the key bar 23 now actually the square 17 the fitting 15 capture and thread 16 turning it becomes an adapter 30 needed on the lower end of the key rod 23 plugged in and then by a user above the earth's surface 13 on the square 17 can be plugged.

In this case, the torque that the user has over the actuator 22 on the key bar 23 There, over the adapter or the coupling sleeve 30 on the square 17 can be transmitted, and reliably.

While the dome sleeve 30 conventionally made of cast steel, it is made according to the invention of a fiber-reinforced polyamide. How to get in the 1 can detect, consists of a metallic coupling sleeve from above the earth's surface 13 at cold temperatures below freezing a cold bridge coming from the actuator 22 over the key bar 23 , the dome sleeve 30 in the square 17 , the thread 16 and with it the fitting 15 as well as the pipeline 14 can get. Such a cold bridge is very dangerous, since they freeze for example, the drinking water in the pipeline 14 can lead.

There is inventively still another effect. The above-mentioned connection is in fact also electrically conductive in the case of a metallic coupling sleeve and can therefore result in accidental contact with power lines or erroneous operation of electrical units in the region of the actuating element 22 Electricity via the key rod's metallic connection 23 in the area of the coupling sleeve 30 arrives. If this is also metallic, these voltage or current peaks can be transmitted to the unit and / or sparking as a result of the contact of metal with metal. This is very dangerous, especially in the case of gas lines, which can lead to inflammations and possibly serious accidents in the worst case scenario.

However, both the cold bridge and the risk of this transmission of electric current are due to the choice of material of the fiber-reinforced polyamide for the coupling sleeve 30 completely eliminated.

In the 2 is the construction of the coupling sleeve 30 shown in detail, which is suitable for the installation kit according to the invention. Previous alternative proposals for coupling sleeves 30 cast steel either provided composite dome sleeves, which nevertheless had the risk of thermal bridges or electrical conductivity, or they simply did not have the required stability for the transmission of torques of the order of magnitude of about 200 Nm to 300 Nm.

By a completely new shape, the invention, however, with a coupling sleeve 30 equipped, which can transmit such torques and still causes neither cold bridges nor electrical conductivity.

The dome sleeve 30 is circular cylindrical and symmetrical to its longitudinal axis. This longitudinal axis is at the same time the axis of the key rod in the application 23 and the thread 16 ,

The circular cylindrical peripheral surface 31 or the jacket of the coupling sleeve 30 forms the outer boundary of the cylinder between two circular end faces 32 and 33 , which are accordingly perpendicular to the axis 34 stand.

From one end surface 32 protrudes symmetrically to the axis 34 a recess 35 with a constant square cross section inwards to about half of the distance between the two circular end faces 32 and 33 ,

This quadrangular recess 35 fits exactly on the square 16 the fitting 15 ,

From the other end surface 33 forth protrudes another recess 36 symmetrical to the axis 34 into the interior of the dome sleeve 30 , and also up to about half of the distance between the two end surfaces 32 and 33 , that is almost or completely up to the contact with the first recess 35 ,

This recess 36 fits exactly to the lower end of the key bar 23 ,

The recesses may also differ from the constant and / or square cross-section to certain types of square 16 or diameter of the key bar 23 to be adapted.

It is also possible to have small holes perpendicular to the axis 34 the dome sleeve 30 from the outer cylindrical circumference 31 to bring in, for example, an axial slipping of the adapter or the coupling sleeve 30 from the bottom of the key bar 23 during insertion into the shaft 11 to avoid.

In the 3 is the look of the dome sleeve 30 to see from the outside, ie without the transparent indicated lines of the recesses 35 and 36 in the 2 ,

As you can see, the diameter of the cylinder or the cylindrical circumference must be 31 not consistently be constant, but may lead to a taper of the cylinder in one direction or the other.

The high stability and the very good transmission of the torque is achieved among other things by the very stable configuration, which the solid material between the outer peripheral surface 31 and the two inner square recesses 35 and 36 causes, together with the form-fitting transmission surfaces of the torque. Since the material of the dome sleeve is a fiber-reinforced polyamide, both the high weights that otherwise occur in steel casting and the high costs for cast steel are not incurred. The solid material, which is otherwise rejected by the professional world, thus solves all problems occurring at this point.

The Fiber reinforced material Polyamide has about it also as extraordinary impact resistant and temperature resistant proved so that also in so far as all requirements are met. This is especially true for reinforced with long glass fibers Polyamide, especially with relatively high fiber contents of 30% to 70%, in particular from 40% to 60%. The long glass fibers can their stabilizing effect due to the shape of the dome sleeve with their also perpendicular to the axis comparatively large length dimensions unfold well.

Between the two recesses 35 and 36 Material is preferably allowed to stand. This is the thermal decoupling of key rod 23 and square 16 as well as the electrical decoupling causes particularly safe and additionally achieved a further stabilizing effect.

The Compact design of the coupling sleeve also allows their particular easy storage, as no special precautions must be taken. After all also the production is facilitated.

Testing have shown that even temperatures of less than -15 ° C hardly a Waste of achievable strength values of the coupling sleeves and thus the reliability the installation kit according to the invention had the consequence.

When fiber reinforcement in particular so-called long glass fibers are used, namely with proportions of 30 to 70% of the total plastic material, in particular from 40 to 60%.

Tests have also shown that the maximum strength values, contrary to the expectations of the skilled person, are now based on the limit strengths of the linkage used, ie the key rod 23 to be limited.

The dome sleeves 30 can be manufactured in particular by injection molding, wherein the provision of pinholes should be considered in the injection molding.

11

shaft

12

ground

13

earth's surface

14

pipe

15

fitting

16

thread

17

square

20

installation kit

21

sleeve pipe

22

actuator

23

key bar

30

coupling sleeve

31

cylindrical peripheral surface

32

end surface

33

end surface

34

axis the dome sleeve

35

first recess

36

second recess

Claims (11)

Installation kit with a valve actuation rod and with a coupling sleeve ( 30 ) made of a plastic, characterized in that the coupling sleeve ( 30 ) consists of a fiber-reinforced polyamide. Fitting kit according to claim 1, characterized in that the coupling sleeve ( 30 ) consists of a glass fiber reinforced polyamide with long glass fibers in a proportion between 30% and 70%. Fitting kit according to claim 2, characterized in that the coupling sleeve ( 30 ) consists of a glass fiber reinforced polyamide with long glass fibers in a proportion between 40% and 60%. Fitting kit according to one of the preceding claims, characterized in that the coupling sleeve ( 30 ) a cylindrical body with a circular cross-section and two perpendicular to the cylinder axis ( 34 ) standing surfaces ( 32 . 33 ) and that symmetrically to the cylinder axis ( 34 ) of both end surfaces ( 32 . 33 ) polygonal recesses ( 35 . 36 ) into the interior of the coupling sleeve ( 30 ) are guided. Fitting kit according to claim 4, characterized in that the polygonal cross sections of the two recesses ( 35 . 36 ) are each square, but with different dimensions. Fitting kit according to claim 4 or 5, characterized in that the two recesses ( 35 . 36 ) are separated by intermediate solid material. Fitting kit according to one of claims 4 to 6, characterized in that one of the recesses ( 36 ) on the lower end of a key bar ( 23 ) of the installation kit ( 20 ) is pluggable. Fitting kit according to one of claims 4 to 7, characterized in that the other recess ( 35 ) of the coupling sleeve ( 30 ) on a square ( 17 ) of a fitting ( 15 ) is pluggable. Fitting kit according to one of the preceding claims, characterized in that perpendicular to the axis of the coupling sleeve ( 30 ) Bores from the outside in the coupling sleeve ( 30 ) are provided. Fitting kit according to one of the preceding claims, characterized in that the coupling sleeve ( 30 ) has a thermoplastic matrix which is equipped with further reinforcing fibers. Installation set according to one of the preceding claims, characterized characterized in that the further reinforcing fibers contain carbon fibers.