阅读说明：本技术 带有长度补偿的液压式连接装置和带有这种连接装置的双重作用的气缸 (Hydraulic connection with length compensation and double-acting cylinder with such a connection ) 是由 M.奥佩尔特 于 2020-01-09 设计创作，主要内容包括：公开了一种液压式连接装置,其具有例如针对热膨胀的长度补偿和针对所述连接装置的一个或两个连接块的减力。此外还公开了一种双重作用的气缸,在该气缸的外侧上设置带有两个连接块的这种连接装置,其中,通过每个连接块能对气缸的两个工作室的其中一个进行填充和排空。基于长度补偿并且基于减力,所述气缸通过所述连接装置没有经受沿着其纵轴线的压力。(A hydraulic connection device is disclosed having length compensation, for example for thermal expansion, and force reduction for one or two connection blocks of the connection device. Furthermore, a dual-acting cylinder is disclosed, on the outside of which a connection device of this type with two connecting pieces is provided, wherein one of the two working chambers of the cylinder can be filled and emptied via each connecting piece. Due to the length compensation and due to the force reduction, the cylinder is not subjected to a pressure force along its longitudinal axis by the connecting device.)

1. A hydraulic connection device having a tube (6) whose first end section (10) can be moved telescopically for length compensation relative to an inner cylindrical jacket (12) of a component, characterized in that the component is a first connecting piece (2), wherein a first radial nozzle (18) is provided on the first end section, the first radial nozzle opening is connected to the first main channel (1) of the first connecting block by means of a pressure medium, wherein the first main channel (1) has a first radial main channel mouth (20) into the first inner cylindrical jacket (12), and wherein the two radial mouths (18, 20) are sealed on both sides in the axial direction of the tube (6), and wherein the first end section (10) has a first axial closing structure (14), the outer side of which is provided with a pressure relief structure.

2. The hydraulic connection according to claim 1, wherein between the first end section (10) and the first inner cylindrical jacket (12) on both sides of the two mouths (18, 20) equally sized and/or identically configured sealing structures (22) are provided around the first end section (10).

3. The hydraulic connection according to any one of the preceding claims, wherein the relief structure is formed by a tank relief structure.

4. The hydraulic connection according to claim 1 or 2, wherein the relief structure is formed by an opening (16) in the first connecting block (2).

5. The hydraulic connection according to claim 4, wherein the opening (16) and the first inner cylindrical jacket (12) have the same diameter and are jointly formed as a through-going groove of the first connecting piece (2).

6. The hydraulic connection according to one of the preceding claims, wherein the second end section (26) of the tube (6) is connected with the second main channel (3) of the second connecting block (4; 104) by means of a pressure medium.

7. The hydraulic connecting device according to claim 6, wherein a second radial nozzle portion is provided on the second end section (26).

8. The hydraulic connection according to claim 7, wherein the second radial nozzle opening is in pressure medium connection with the second main channel, and wherein the second main channel has a second main channel nozzle opening into a second inner cylindrical jacket, and wherein the second end section has a second axial closing construction, and wherein a pressure relief construction is provided for a second outer side of the second axial closing construction.

9. The hydraulic connecting device according to claim 6, wherein the second end section (26) is fixed to the second connecting piece (4; 104) by means of a screw connection (28).

10. The hydraulic connection according to claim 9, wherein the second main channel (3) is curved or bent, and wherein the second main channel (3) opens into the second end section (26) of the pipe (6) along the longitudinal axis (8) of the pipe on the one hand, and has a main channel section (32) oriented transversely to the longitudinal axis (8) of the pipe (6) on the other hand.

11. The hydraulic connection according to claim 6 or 9, wherein the second connecting block (104) has a third main channel (150) with a main channel section (152) oriented transversely to the longitudinal axis (8) of the pipe (6).

12. Double-acting cylinder (34) on whose outer jacket the hydraulic connection device according to claim 11 is fixed, wherein a first radial working connection (40) of the cylinder (34) is directly fluidically connected to the first main channel (1) of the first connecting block (2), and wherein a second radial working connection (42) of the cylinder (34) is directly fluidically connected to the main channel section (152) of the third main channel (150).

13. The dual-acting cylinder (34) as claimed in claim 12, wherein the second connecting block (104) is designed to be expanded into a valve block having at least one control valve for controlling the cylinder (34).

Technical Field

The invention relates to a hydraulic connection with length compensation and to a dual-acting cylinder with such a connection according to the preamble of claim 1.

Background

The hydraulic connection is usually made from an axially open tube. These tubes are often connected to the connecting piece at the end and are welded there, for example. Such tubes must therefore be measured accurately. When a temperature rise of the pipe occurs during operation, the axial expansion of the pipe may exert a large force on the connecting block. Furthermore, the tube and therefore the welded connection must receive forces which are caused by the length extension of the cylinder (for example when a force is applied), which additionally loads the weld seam.

Hydraulic connecting devices are therefore known from the prior art, which are formed from two telescopic, axially displaceable tubes. Such a telescopic tube for automatic fire extinguishing systems, which is suitable for high pressures and which, after its installation, can compensate for temperature effects, is disclosed in document EP 0536740 a 1. For this purpose, an inner tube and a push tube (Ueberschubrohr) were provided.

It is also known to insert an end section of a pipe or hose in a sealing manner into a receiving bore, for example, in the form of a blind bore, of a connecting block. A correspondingly high pressure is then generated under high hydraulic pressure in the axial direction of the pipe or in the axial direction of the end section of the hose, since the pressure is also exerted on the bottom surface of the receiving bore, which corresponds to the cross section of the pipe or hose. This also applies to the above-described length-compensating hydraulic connection. This pressure must be supported by the connecting block in a disadvantageous manner, i.e. transmitted to the other component.

Disclosure of Invention

The object of the invention is therefore to create a length-compensating hydraulic connection with a pipe, wherein the connection does not generate a corresponding pressure in the axial direction of the pipe when the pressure is applied, which pressure is necessarily supported by the connecting piece, i.e. transmitted to the load-bearing component. The object of the invention is also to create a double-acting cylinder with a length-compensating hydraulic connection which, when subjected to pressure, does not generate a corresponding pressure in the axial direction of the pipe, which pressure is necessarily supported by the connecting piece and transmitted to the cylinder.

This object is achieved by a hydraulic connection having the features of claim 1 and by a double-acting cylinder having the features of claim 12.

Further advantageous embodiments of the invention are specified in the dependent claims.

The claimed hydraulic connection has a tube, the end section of which can be moved telescopically for length compensation relative to an inner cylindrical jacket of the other component, in particular a receiving bore which is simple to produce. According to the invention, the further component is a connecting piece, wherein a radial mouth is provided on the end section of the tube, which radial mouth is in direct fluid connection with the main channel of the connecting piece. The main channel has a radial mouth also into the inner cylindrical jacket. The end section of the tube has an axial closure. "radial" and "axial" are with reference to the longitudinal axis of the tube. The pressure relief structure is provided for the outside of the axial closing structure which is at the same time the closed end side of the tube. The two radial mouths are sealed jointly and on both sides, i.e. at two different points viewed along the longitudinal axis of the tube. A length-compensating hydraulic connection is thus created which, when subjected to pressure, does not generate a corresponding pressure along the longitudinal axis of the pipe, which pressure is necessarily supported by the connecting piece and transmitted to the load-bearing component.

The connection device according to the invention is simple to produce when a sealing structure of the same size and/or design is provided between the end section and the inner cylindrical jacket of the connection piece on both sides of the two mouths, which sealing structure surrounds the end section.

The pressure relief structure may be formed by a bin relief structure (Tankentlastung) through which the outer side can be relieved to the bin pressure, or by an opening in the first connection block through which the outer side can be relieved to the ambient pressure.

It is also possible to consider only a slight pressure level relief. This then results in a substantially reduced axial force compared to the prior art.

In the variant with an opening, it is simple in terms of production technology that this opening and the inner cylindrical jacket have the same diameter and are jointly formed as a through-opening of the through-recess, in particular of the connecting piece.

The other (second) end section of the tube may be in direct fluid connection with the second main channel of the second connection block.

A second radial mouth may also be provided on the second end section of the tube.

The second radial mouth of the second end section can be directly fluidically connected to a second main channel of the second connecting piece, wherein the second main channel has a second radial mouth into the second inner cylindrical jacket, in particular a second receiving bore of the second connecting piece. The second end section then also has an axial closing structure, for which a pressure relief structure is also provided. The connection device according to the invention is therefore designed and relieved equally at both end sections of the pipe. Only the tube itself is loaded with tensile load and not one of the two connecting pieces. None of the two connecting blocks thus receives the pressure along the longitudinal axis of the pipe and conducts it to the load-bearing member.

The second end section of the pipe may alternatively be fixed to the second connecting piece by a bolted connection. At least one bolt of the bolted connection is oriented parallel to the longitudinal axis of the pipe. The tensile-loaded pipe is held on the second connecting piece by at least one tensile-loaded bolt. The connection device according to the invention is therefore also relieved on both sides. None of the two connecting blocks must receive and conduct forces along the longitudinal axis of the pipe to the load-bearing member.

In this case, it is preferred that the second main channel is curved or bent, so that the second main channel opens into the second end section of the tube along the longitudinal axis of the tube and has a main channel section oriented transversely to the longitudinal axis of the tube. This main channel section is preferably oriented parallel to the main channel of the first-mentioned connecting piece.

The second connecting block alternatively has two main channels, namely a second main channel and a third main channel, with reference to the entire connecting device according to the invention, wherein the third main channel has a main channel section oriented transversely to the longitudinal axis of the pipe.

The claimed dual action cylinder has an outer jacket to which the attachment means is secured. In this case, one of the two connecting pieces of the connecting device is connected to two radial working connections of the cylinder. The first radial working connection of the cylinder is then in direct fluid connection with the main channel of the first-mentioned connecting block, and the second radial working connection of the cylinder is in direct fluid connection with a third main channel formed in the second connecting block. "radial" is with reference to the longitudinal axis of the cylinder.

The force-reducing structure according to the invention is particularly important and advantageous when the longitudinal axis of the tube is parallel to the longitudinal axis of the cylinder.

In a preferred embodiment, the cylinder is a differential cylinder, the first radial working port of which is in direct fluid connection with the annular space of the differential cylinder, and the second radial working port of which is in direct fluid connection with the piston bottom space of the differential cylinder.

The second connecting piece of the connecting device fixed to the cylinder can be used only for the passage of pressure medium, or it can be expanded to form a valve block. This valve block can then have at least one control valve for the control cylinder, which control valve can preferably be formed in the valve block. The control valve can connect the pump connection either (via the second main channel and the pipe and the first main channel) to the annular space or (via the third main channel) to the piston bottom space. Thus creating a compact, bi-directional linear actuator.

Drawings

There are shown in the drawings embodiments of the invention. In the figure:

fig. 1 shows a longitudinal section through a first exemplary embodiment of a pressure-loadable hydraulic connection according to the invention with length compensation and force compensation; and is

Fig. 2 shows a double-acting cylinder according to the invention with a pressure-loaded hydraulic connection with length compensation and force compensation in longitudinal section according to a second exemplary embodiment.

Detailed Description

Fig. 1 shows a first exemplary embodiment of a hydraulic connection according to the invention with length compensation and force compensation. The connecting means connects a first main channel 1 formed in a first connecting block 2 with a second main channel 3 formed in a second connecting block 4. The two main channels 1, 3 are arranged parallel to each other. The two main channels 1, 3 may be holes. The tube 6 extends along its longitudinal axis 8 perpendicularly to the two main channels 1, 3.

In order to transmit no forces (tensile or pressure) along the longitudinal axis 8 to the two connecting pieces 2, 4 when the connecting device is elongated in length, for example due to heating of the tube 6, or when the connecting device is subjected to pressure by means of a fluid to be conducted through, the first end section 10 of the tube 6 is telescopically received in a displaceable manner in an inner cylindrical jacket 12 of the first connecting piece 2. The inner cylindrical sheath 12 may be a receiving bore.

The first end section 10 of the tube 6 has an axial closure 14 on the end side, on the outside of which (in fig. 1, below) a pressure reduction structure is arranged. This relief structure has an opening 16 which connects the region formed between the axial closing structure 14 and the inner cylindrical jacket 12 to the surroundings of the first connecting piece 2.

The first end section 10 has a radial mouthpiece 18, which is arranged adjacent to a radial main channel mouth 20, which forms a transition region between the first main channel 1 and the cylindrical jacket 12.

The two mouths 18, 20 are sealed from the surroundings. More precisely, one sealing structure 22 is provided between the two mouths 18, 20 and the depressurized end face of the first end section 10, and a further sealing structure 24 is provided on the other side of the two mouths 18, 20.

A second end section 26 of the pipe 6 opposite the first end section 10 widens radially and is designed as a flange, so that the second end section 26 is braced on the end side by means of a screw connection 28 against the second connecting piece 4. An axial sealing structure 30 is provided between the end section 26 or flange and the second connecting piece 4.

The second main channel 3 of the connecting means formed in the second connecting piece 4 is bent. The second main channel 3 has a section extending along the longitudinal axis 8 of the pipe 6 and a main channel section 32 which runs parallel to the first main channel 1 of the first connecting piece 2 and here perpendicular to the longitudinal axis 8.

When the first exemplary embodiment of the connecting device according to the invention according to fig. 1 is fastened by means of fastening screws 44 (not shown in fig. 1) (according to fig. 2) which extend through the connecting pieces 2, 4 perpendicularly to the longitudinal axis 8, these fastening screws 44 do not have to carry transverse forces. These transverse forces can be generated in the case of the connecting devices known from the prior art, on the one hand, by the length change of the tube 6 as a result of temperature fluctuations of the fluid passed through it, or by the pressure F exerted by the pressure-loaded fluid on the connecting device according to the arrows.

In the connection according to the invention, the pressure force F only loads the tube 6 and the screw connection 28 with a tensile force. The first end section 10 can be moved substantially in the cylindrical jacket 12 along the longitudinal axis 8 in accordance with the change in length of the tube 6. The pressure medium connection from the pipe 6 via the two mouths 18, 20 to the first main channel 1 is in this case always sealed off from the surroundings by two sealing structures 22, 24.

Fig. 2 shows a double-acting cylinder according to the invention with a connecting device according to a second exemplary embodiment with length compensation and force compensation. The cylinder is configured as a differential cylinder 34 with an annular space 36 and a piston bottom space 38. The annular space 36 is connected via a first working connection 40 to the first main channel 1 of the first connecting piece 2, and the piston bottom space 38 is connected via a second working connection 42 to a main channel section 152 of a third main channel 150 of the second connecting piece 104. Two working connections 40, 42 are formed on the outer jacket of differential cylinder 34 and extend radially to the longitudinal axis 154 of the differential cylinder.

The second exemplary embodiment of fig. 2 is configured as described above for the first exemplary embodiment of fig. 1 with regard to the tube 6 interacting with the first connecting piece 2 and the first end section 10 of the tube and with regard to the fastening of the second end section 26 to the second connecting piece 104 by means of the screw connection 28.

The second connection block 104 of the second embodiment is designed differently from the first embodiment. More precisely, the second main channel 103 is not meandering. A (already mentioned) third main channel 150 is additionally provided, which is angled so that its main channel section 152 is flush with the second radial working connection 42 of the differential cylinder 34.

The second main channel 103 of the connecting device and the third main channel 150 of the connecting device are therefore arranged together in the second connecting piece 104 and there serve for the two spaces 36, 38 of the differential cylinder 34.

Fig. 2 shows the heads of the fastening screws 44 relieved according to the invention, two fastening screws each being provided for fastening the connecting piece 2, 104. The two fastening screws 44 of the first connecting piece 2 do not have to carry transverse forces in particular and therefore also transmit forces to the differential cylinder 34 along the longitudinal axis 154 of the differential cylinder, so that this differential cylinder is advantageously not subjected to bending forces caused by the heating and/or pressure-loaded connecting means.

A hydraulic connection device is disclosed having length compensation, for example for thermal expansion, and force reduction for one or two connection blocks of the connection device. Furthermore, a dual-acting cylinder is disclosed, on the outside of which a connection device of this type with two connecting pieces is provided, wherein one of the two working chambers of the cylinder can be filled and emptied via each connecting piece. Due to the length compensation and due to the force reduction, the cylinder is not subjected to a pressure force along its longitudinal axis by the connecting device.