Hydraulic connection with length compensation and double-acting cylinder with such connection

Abstract

A hydraulic connection device is disclosed, which has a length compensation, for example, for thermal expansion and a force reduction for one or both connection blocks of the connection device. Furthermore, a double-acting pneumatic cylinder is disclosed, on the outside of which such a connection device with two connection blocks is arranged, wherein, by each connection block, one of the two working chambers of the cylinder can be filled and emptied. On the basis of the length compensation and on the basis of the force reduction, the cylinder is not subjected to pressure along its longitudinal axis by the connection device.

Description

Technical Field

[0001] The present invention relates to a hydraulic connection device with length compensation and a cylinder with such a connection device for dual-function operation. Background Technology

[0002] Hydraulic couplings are typically made of axially open tubing. These tubings are often attached to the coupling block at the ends and, for example, welded there. Therefore, precise measurement of this tubing is essential. When the tubing heats up during operation, the axial expansion of the tubing can exert significant forces on the coupling block. Furthermore, the tubing, and therefore the welded connection, inevitably receives forces caused by the extension of the cylinder's length (e.g., when force is applied), which adds an additional load to the weld.

[0003] Therefore, hydraulic connection devices are known from the prior art, which consist of two telescopic tubes capable of axial movement. Such telescopic tubes for automatic fire extinguishing equipment are disclosed in document EP 0 536 740 A1. These telescopic tubes are suitable for high pressure and can compensate for temperature effects after installation. For this purpose, an inner tube and a push tube (Ueberschubrohr) are provided.

[0004] It is also known that the end section of the pipe or hose is sealed into a receiving hole, for example, a blind hole, in the connecting block. A correspondingly high pressure is then generated along the axial direction of the pipe or the end section of the hose under high hydraulic pressure, because the pressure is also applied to the bottom surface of the receiving hole, which corresponds to the cross-section of the pipe or hose. This also applies to the aforementioned hydraulically connected devices with compensated length. This pressure is necessarily supported unfavorably by the connecting block, i.e., transmitted to another component. Summary of the Invention

[0005] Therefore, the object of the present invention is to create a hydraulically connected device with a compensated length, having a tube, wherein the device does not generate a corresponding pressure along the axial direction of the tube when pressure is applied, the pressure being necessarily supported by the connecting block and transmitted to the load-bearing component. Furthermore, the object of the present invention is also to create a double-acting cylinder with a hydraulically connected device with a compensated length, wherein the device does not generate a corresponding pressure along the axial direction of the tube when pressure is applied, the pressure being necessarily supported by the connecting block and transmitted to the cylinder.

[0006] This task is solved by the hydraulic connection device according to the invention and by the dual-acting cylinder according to the invention.

[0007] Other advantageous designs of the invention include: between the first end section and the inner first cylindrical sheath, on both sides of the two nozzles, a sealing structure of the same size and / or identical construction is provided around the first end section; the pressure-reducing structure is formed by a hopper unloading structure; the pressure-reducing structure is formed by an opening in the first connecting block; the opening and the inner first cylindrical sheath have the same diameter and together form a through groove in the first connecting block; the second end section of the tube is connected to a second main channel of the second connecting block via a pressure medium; a radial second nozzle is provided on the second end section; the radial second nozzle is connected to the second main channel via a pressure medium, and wherein the second main channel has a connection to the interior... The second cylindrical sheath has a second main channel nozzle, wherein the second end section has an axial second closure structure, and wherein a pressure-reducing structure is provided on the second outer side of the axial second closure structure; the second end section is fixed to the second connecting block by a bolt connection structure; the second main channel is curved or bent, and wherein the second main channel extends into the second end section of the pipe along the longitudinal axis of the pipe on one hand, and has a main channel section oriented transversely to the longitudinal axis of the pipe on the other hand; the second connecting block has a third main channel, which has a main channel section oriented transversely to the longitudinal axis of the pipe; the second connecting block is extended to form a valve assembly having at least one control valve for controlling the cylinder.

[0008] The claimed hydraulic connection device has a tube, the end section of which is telescopically movable relative to an internal cylindrical sheath of another component, particularly a receiving hole that is technically simple to manufacture, for length compensation. According to the invention, the other component is a connecting block, wherein a radial nozzle is provided on the end section of the tube, the radial nozzle being directly fluidly connected to the main channel of the connecting block. The main channel has radial nozzles similarly connected to the internal cylindrical sheath. The end section of the tube has an axially closed structure. "Radial" and "axial" refer to the longitudinal axis of the tube. A pressure-reducing structure is provided on the outside of the axially closed structure, which is also the closed end side of the tube. The two radial nozzles are sealed together and on both sides, i.e., at two different locations viewed along the longitudinal axis of the tube. Thus, a length-compensating hydraulic connection device is created that, under pressure loading, does not generate a corresponding pressure along the longitudinal axis of the tube, which is necessarily supported by the connecting block and transmitted to the load-bearing component.

[0009] The connecting device according to the invention is simple to manufacture when a sealing structure of the same size and / or the same construction is provided on both sides of the two mouths between the cylindrical sheath inside the end section and the connecting block.

[0010] The pressure relief structure can be formed by a tank unloading structure (Tankentlastung), through which the outer side can be unloaded to the tank pressure, or the pressure relief structure can be formed by an opening in the first connecting block, through which the outer side can be unloaded to the ambient pressure.

[0011] Alternatively, the load could be reduced to a very small pressure level. This would result in a significantly reduced axial force compared to existing technologies.

[0012] In the variant with an opening, what is technically simple is that the opening and the inner cylindrical sheath have the same diameter and together form a through groove, particularly a through hole for the connecting block.

[0013] The other (second) end section of the pipe can be directly fluidly connected to the second main channel of the second connecting block.

[0014] A second radial nozzle can also be provided on the second end section of the tube.

[0015] The second radial nozzle of the second end section can be directly fluidly connected to the second main channel of the second connecting block, wherein the second main channel has a second radial nozzle leading to the second inner cylindrical sheath, specifically the second receiving hole of the second connecting block. The second end section then also has an axially closed structure, for which a pressure-reducing structure is also provided. Thus, the connecting device according to the invention is similarly designed and stress-reducing at both end sections of the pipe. Only the pipe itself is loaded with tensile load and no load is applied to either of the two connecting blocks. Therefore, neither of the two connecting blocks receives pressure along the longitudinal axis of the pipe and dissipates this pressure to the load-bearing member.

[0016] Alternatively, the second end section of the pipe can be fixed to the second connecting block by a bolted connection structure. At least one bolt of the bolted connection structure is oriented parallel to the longitudinal axis of the pipe. The pipe under tensile load is held to the second connecting block by at least one bolt under tensile load. The connection device according to the invention is thus also de-stressed on both sides. Neither of the two connecting blocks must receive the force along the longitudinal axis of the pipe and transmit that force to the load-bearing member.

[0017] Preferably, the second main channel is curved or bent, so that it extends into the second end section of the pipe along the longitudinal axis of the pipe and also has a main channel section oriented transversely to the longitudinal axis of the pipe. This main channel section is preferably parallel to the main channel orientation of the connecting block mentioned first.

[0018] The second connecting block alternative has two main channels, namely, a second main channel and a third main channel when referring 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 tube.

[0019] The claimed dual-acting cylinder has an outer sheath on which the aforementioned connecting device is fixed. Here, one of each of the two connecting blocks of the aforementioned connecting device is connected to two radial working joints of the cylinder. The first radial working joint of the cylinder is then in direct fluid connection to the main channel of the first-mentioned connecting block, and the second radial working joint of the cylinder is in direct fluid connection to a third main channel formed in the second connecting block. "Radial" is relative to the longitudinal axis of the cylinder.

[0020] 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.

[0021] In a preferred application, the cylinder is a differential cylinder, wherein a first radial working joint of the differential cylinder is directly fluidly connected to the annular space of the differential cylinder, and a second radial working joint is directly fluidly connected to the piston bottom space of the differential cylinder.

[0022] The second connecting block of the connecting device fixed to the cylinder can be used only for the passage of a pressure medium, or the second connecting block can be extended into a valve assembly. This valve assembly can then have at least one control valve for controlling the cylinder, which is preferably formed within the valve assembly. The control valve can connect the pump connector either (via the second main channel and pipe, and the first main channel) to the annular space, or (via the third main channel) to the piston bottom space. This creates a compact, bidirectional linear actuator. Attached Figure Description

[0023] Several embodiments of the present invention are illustrated in the accompanying drawings. In the figures: Figure 1 The longitudinal sectional view shows, according to the first embodiment, a pressure-loadable hydraulic connection device of the present invention with length compensation and force compensation; and Figure 2 The longitudinal section view shows a dual-acting cylinder according to the invention with a hydraulic coupling device capable of pressure loading, the hydraulic coupling device having length compensation and force compensation, according to a second embodiment. Detailed Implementation

[0024] Figure 1 A first embodiment of the hydraulic connection device according to the invention, with length and force compensation, is shown. The connection device 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 and 3 are arranged parallel to each other. The two main channels 1 and 3 may be holes. A pipe 6 extends perpendicularly to the two main channels 1 and 3 along its longitudinal axis 8.

[0025] In order to prevent any force (tension or pressure) from being transmitted along the longitudinal axis 8 to the two connecting blocks 2, 4 when, for example, the length of the tube 6 is extended due to heating or when pressure is applied to the connecting device by the fluid to be guided through, the first end section 10 of the tube 6 is telescopically and movably received in a cylindrical sheath 12 inside the first connecting block 2. The inner cylindrical sheath 12 may be a receiving hole.

[0026] The first end section 10 of the pipe 6 has an axially closed structure 14 on the end side, on the outside of the closed structure (in Figure 1 A pressure-reducing structure is provided at the lower center. This pressure-reducing structure has an opening 16 that connects the area formed between the axially closed structure 14 and the inner cylindrical sheath 12 to the surrounding environment of the first connecting block 2.

[0027] The first end section 10 has a radial nozzle portion 18, which is arranged adjacent to the radial main channel nozzle portion 20, forming a transition area between the first main channel 1 and the cylindrical sheath 12.

[0028] The two nozzles 18 and 20 are sealed relative to the surrounding environment. More precisely, a sealing structure 22 is provided between the two nozzles 18 and 20 and the pressure-reducing end face of the first end section 10, and another sealing structure 24 is provided on the other side of the two nozzles 18 and 20.

[0029] The second end section 26 of pipe 6, opposite the first end section 10, is radially widened and constructed as a flange, so that the second end section 26 is tensioned toward the second connecting block 4 at the end side by a bolted connection structure 28. An axial sealing structure 30 is provided between the end section 26 or the flange and the second connecting block 4.

[0030] The second main channel 3 formed in the second connecting block 4 of the connecting device 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 that is parallel to the first main channel 1 of the first connecting block 2 and extends perpendicular to the longitudinal axis 8.

[0031] In through ( Figure 1 (not shown in the text) (according to Figure 2 The fixing bolts 44, which extend perpendicularly to the longitudinal axis 8 and pass through the connecting blocks 2 and 4, are used to fix the connection. Figure 1 In the first embodiment of the connecting device according to the invention, these fixing bolts 44 do not need to bear lateral forces. These lateral forces in connecting devices known in the prior art can be generated, on the one hand, by the change in length of the pipe 6 based on the temperature fluctuation of the fluid passing through it, or by the pressure F applied to the connecting device by the pressure-loaded fluid as indicated by the arrow.

[0032] In the connection device according to the invention, pressure F applies a tensile load only to the pipe 6 and the bolted connection structure 28. The first end section 10 can move approximately along the longitudinal axis 8 within the cylindrical sheath 12, corresponding to variations in the length of the pipe 6. Here, the pressure medium connection from the pipe 6 via the two nozzles 18, 20 to the first main channel 1 is always sealed relative to the surrounding environment by two sealing structures 22, 24.

[0033] Figure 2 A dual-acting cylinder according to the invention is shown, with a connecting device according to a second embodiment that includes length compensation and force compensation. The cylinder is configured as a differential cylinder 34 having an annular space 36 and a piston bottom space 38. The annular space 36 is connected to the first main channel 1 of the first connecting block 2 via a first working joint 40, and the piston bottom space 38 is connected to the main channel section 152 of the third main channel 150 of the second connecting block 104 via a second working joint 42. The two working joints 40, 42 are formed on the outer sheath of the differential cylinder 34 and extend radially along the longitudinal axis 154 of the differential cylinder.

[0034] Figure 2 The second embodiment relates to the pipe 6 that cooperates with the first connecting block 2 and the first end section 10 of the pipe, and to the fixation of the second end section 26 to the second connecting block 104 by means of the bolt connection structure 28, as follows: Figure 1 It was designed as in the first embodiment.

[0035] The interior of the second connecting block 104 in the second embodiment differs from that in the first embodiment. More precisely, the second main channel 103 is not bent. A third main channel 150 (already mentioned) is provided, which is bent, so that the main channel section 152 of the third main channel is flush with the second radial working joint 42 of the differential cylinder 34.

[0036] Therefore, the second main channel 103 and the third main channel 150 of the connecting device are jointly disposed in the second connecting block 104 and there are two spaces 36 and 38 for supplying the differential cylinder 34.

[0037] exist Figure 2 The image shows the head of the fixing bolt 44 according to the invention for load reduction, wherein two fixing bolts are provided for fixing the connecting blocks 2, 104. The two fixing bolts 44 of the first connecting block 2 do not need to bear lateral forces and therefore do not transmit forces to the differential cylinder 34 along the longitudinal axis 154 of the differential cylinder, so that the differential cylinder is advantageously not subjected to bending forces caused by the heating connection device and / or pressure loading connection device.

[0038] A hydraulic connection device is disclosed, which has, for example, length compensation for thermal expansion and force reduction for one or both connecting blocks of the connection device. A double-acting cylinder is also disclosed, wherein such a connection device with two connecting blocks is provided on the outer side of the cylinder, wherein one of the two working chambers of the cylinder can be filled and emptied via each connecting block. Based on length compensation and force reduction, the cylinder is not subjected to pressure along its longitudinal axis via the connection device.

Claims

1. Hydraulic connection device, with a tube (6), whose first end section (10) is telescopically movable relative to a first cylindrical jacket (12) inside a component for length compensation, characterized in that The component is a first connecting block (2), wherein a radial first nozzle (18) is provided on the first end section, the radial first nozzle being connected to the first main channel (1) of the first connecting block via a pressure medium, wherein the first main channel (1) has a radial first main channel nozzle (20) extending into the first cylindrical sheath (12) inside, and wherein two radial nozzles (18, 20) are sealed on both sides along the axial direction of the tube (6), and wherein the first end section (10) has an axial first sealing structure (14), and a pressure-reducing structure is provided on the outside of the sealing structure.

2. The hydraulic connection device according to claim 1, wherein, Between the first end section (10) and the first cylindrical sheath (12) inside, a sealing structure (22) of the same size and / or the same construction is provided on both sides of the two mouths (18, 20) surrounding the first end section (10).

3. The hydraulic connection device according to claim 1 or 2, wherein, The pressure-reducing structure is formed by the hopper load-reducing structure.

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

5. The hydraulic connection device according to claim 4, wherein, The opening (16) and the inner first cylindrical sheath (12) have the same diameter and together form a through groove of the first connecting block (2).

6. The hydraulic connection device according to claim 1 or 2, wherein, The second end section (26) of the pipe (6) is connected to the second main channel (3) of the second connecting block (4; 104) for pressure medium connection.

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

8. The hydraulic connection device according to claim 7, wherein, The radial second nozzle is connected to the second main channel via a pressure medium, and the second main channel has a second main channel nozzle extending into a second cylindrical sheath, and the second end section has an axial second closure structure, and a pressure-reducing structure is provided on the second outer side of the axial second closure structure.

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

10. The hydraulic connection device according to claim 9, wherein, The second main channel (3) is curved or bent, and wherein the second main channel (3) extends into the second end section (26) of the pipe (6) along the longitudinal axis (8) on 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 device according to claim 6, wherein, The second connecting block (104) has a third main channel (150) having a main channel section (152) oriented transversely to the longitudinal axis (8) of the pipe (6).

12. A double-acting cylinder (34), on the outer sleeve of which is fixed a hydraulic connection device according to claim 11, wherein, The first radial working joint (40) of the cylinder (34) is directly fluidly connected to the first main channel (1) of the first connecting block (2), and wherein the second radial working joint (42) of the cylinder (34) is directly fluidly connected to the main channel section (152) of the third main channel (150).

13. The dual-acting cylinder (34) according to claim 12, wherein, The second connecting block (104) is extended to a valve assembly having at least one control valve for controlling the cylinder (34).

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