Ultrahigh pressure plane flange sealing device for hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinder sealing, in particular to an ultrahigh pressure plane flange sealing device for a hydraulic oil cylinder. Comprising a plane flange, a mounting groove is formed in the bottom of the plane flange, a sealing assembly is arranged in the mounting groove, and the sealing assembly comprises an O-shaped sealing piece and a self-made annular sealing piece. The sealing assembly is tightly attached to the oil cylinder installation plane and the plane flange, so that a good sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinder sealing, in particular to an ultra-high pressure plane flange sealing device for a hydraulic cylinder. Background Art

[0002] Hydraulic cylinders are an essential part of many hydraulic equipment. When we use hydraulic cylinders, we need to provide them with enough "force" to make them move. The force they get is generated by hydraulic oil based on "Pascal's law", that is, solids transmit pressure, and liquids transmit pressure. When we need the hydraulic cylinder to generate a very large force, we need to pressurize the liquid in the hydraulic cylinder, and the liquid in the hydraulic cylinder is provided by the hydraulic station. The hydraulic station and the hydraulic cylinder are connected by a flat flange, fixed by bolts, and the hydraulic oil is transported through a flange-welded oil pipe in the middle.

[0003] At present, the common cylinder flat connection flanges on the market are mostly sealed with O-rings or annular seals with a rectangular cross-section. The flange is connected to the cylinder plane with bolts, and a certain pre-tightening force is applied to compress the seal for sealing. When the cylinder is pressurized, this type of sealing will cause the cylinder barrel to expand and the flange to be stressed, and a gap will be created between the flange and the mounting plane of the cylinder. The hydraulic oil in the cylinder barrel will leak out through this small gap. When the gap is too large, the seal will be squeezed, causing part of the seal to enter the gap between the cylinder flange mounting plane and the flange. When the cylinder is depressurized, the cylinder barrel will shrink, and the gap between the flange and the cylinder mounting surface will close, causing the seal to be clamped, thereby causing serious oil leakage at the flange connection. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art, and to propose an ultra-high pressure flat flange sealing device for a hydraulic cylinder, which can effectively solve the problem of hydraulic oil leakage at the connection between the flat flange and the cylinder and protect the seal. At the same time, this method has a simple principle, is easy to maintain, and has good practicality and wide applicability.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An ultra-high pressure flat flange sealing device for a hydraulic cylinder comprises a flat flange and a sealing device. A mounting groove is arranged at the bottom of the flat flange, an O-type seal and a self-made ring seal are arranged in the mounting groove, and the flat flange is fixed to the oil port by bolts.

[0007] Preferably, the cross section of the mounting groove is in the shape of a right-angled trapezoid.

[0008] Preferably, the cross section of the self-made ring seal is in the shape of a trapezoid at right angles.

[0009] Preferably, the two sides of the right-angled trapezoid shape 1 are equal to the two sides of the right-angled trapezoid shape 2, and the two bases of the right-angled trapezoid shape 1 are not equal to the two bases of the right-angled trapezoid shape 2.

[0010] Preferably, the O-shaped seal is close to the right-angled side of the installation groove, and the self-made annular seal is far away from the right-angled side of the installation groove.

[0011] Preferably, a spring washer is provided between the bolt and the plane flange.

[0012] An ultra-high pressure flat flange sealing device for a hydraulic cylinder comprises the following steps when in use:

[0013] Step 1: Install the sealing assembly into the installation groove with a right-angle trapezoidal cross-section processed at the bottom of the flat flange.

[0014] Step 2: Install the O-ring seal on the right-angle side of the installation groove, and install the acute angle of the self-made annular seal with a processed right-angle trapezoidal cross-section corresponding to the acute angle of the installation groove.

[0015] Step 3: Install the flat flange on the oil port of the cylinder that needs to be sealed and secure it with bolts.

[0016] Compared with the existing technology, the utility model provides an ultra-high pressure flat flange sealing device for a hydraulic cylinder, which has the following advantages:

[0017] 1. Simple structure and low cost;

[0018] 2. Good sealing effect, through the close fit between the sealing component and the cylinder mounting plane and the plane flange, a good sealing effect is achieved;

[0019] 3. Wide applicability, can be installed on different equipment that needs to be sealed, suitable for a variety of sealing structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of an ultra-high pressure flat flange sealing device for a hydraulic cylinder in the utility model;

[0021] Figure 2 It is a cross-sectional structural diagram of an ultra-high pressure flat flange sealing device for a hydraulic cylinder in the utility model;

[0022] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0023] Figure 4 for Figure 3 Enlarged view of middle part B;

[0024] Figure 5The utility model is a schematic diagram of a flat flange of an ultra-high pressure flat flange sealing device for a hydraulic cylinder.

[0025] In the figure: 1. flat flange, 11. mounting groove, 2. bolt, 3. spring washer, 4. O-ring seal, 5. homemade annular seal, 6. oil cylinder, 7. mounting plane, 8. oil port. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be understood that the terms "right angle", "acute angle", "two sides", "bottom edge" are descriptions based on the figures shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation structure and operation, and therefore cannot be understood as a limitation on the utility model.

[0028] Embodiment 1, as Figure 1 , Figure 2 and Figure 3 As shown, an ultra-high pressure flat flange sealing device for a hydraulic cylinder includes a flat flange 1, a mounting groove 11 is provided at the bottom of the flat flange 1, an O-ring seal 4 and a self-made annular seal 5 are provided in the mounting groove 11, and the flat flange 1 is fixed to the oil port 8 by bolts 2.

[0029] Example 2, please continue to refer to Figure 2 and Figure 3 The cross-section of the mounting groove 11 is a right-angled trapezoidal shape 1, and the cross-section of the homemade annular seal 5 is a right-angled trapezoidal shape 2. The two waists of the right-angled trapezoidal shape 1 are equal to the two waists of the right-angled trapezoidal shape 2, and the two bottom sides of the right-angled trapezoidal shape 1 are not equal to the two bottom sides of the right-angled trapezoidal shape 2. Through the setting of this technical solution, during installation, the mounting groove 11 has enough space to place the O-ring seal 4 and the homemade annular seal 5.

[0030] When the utility model is used, the following steps are included:

[0031] Step 1: Install the O-ring seal 4 and the self-made annular seal 5 in the installation groove 11 with a right-angle trapezoidal cross section processed at the bottom of the plane flange 1;

[0032] Step 2: Install the O-ring seal 4 on the right angle side of the installation groove 11, and install the acute angle of the self-made annular seal 5 with a processed right-angle trapezoidal cross section corresponding to the acute angle of the installation groove 11;

[0033] Step 3: Install the flat flange 1 on the oil port 8 of the oil cylinder 6 that needs to be sealed, and fix it with bolts 2.

[0034] During installation, please refer to Figure 4 and Figure 5 The O-type seal 4 is close to the right angle side of the installation groove 11, and the self-made annular seal 5 is far away from the right angle side of the installation groove 11. The acute angle of the right-angled trapezoidal shape 1 is installed corresponding to the acute angle of the right-angled trapezoidal shape 2, and the O-type seal 4 is installed on the inner side of the self-made annular seal 5 and the two are tightly fitted.

[0035] When in use, install the O-ring seal 4 and the homemade annular seal 5 in the installation groove processed at the bottom of the plane flange 1. Grease can be applied to make the sealing component adhere to the installation groove to prevent the sealing component from falling off when installing the plane flange 1. After installing the O-ring seal 4 and the homemade annular seal 5, install the plane flange 1 on the installation plane 7 processed at the bottom of the cylinder 6, and fix the plane flange 1 with bolts 2. A spring washer 3 is arranged between the bolts 2 and the plane flange 1 to prevent the bolts 2 from loosening.

[0036] When the oil cylinder 6 moves, it is necessary to inject hydraulic oil into the oil cylinder 6 through the oil port 8 at the connection between the oil cylinder 6 and the plane flange 1. When the pressure of the injected hydraulic oil is increased, a gap will be generated between the plane flange 1 and the oil cylinder 6, and the hydraulic oil will flow out from this gap, squeezing the O-ring seal 4, thereby allowing the O-ring seal 4 to squeeze the homemade annular seal 5. The cross-section of the homemade annular seal 5 is a right-angled trapezoid. A mounting groove 11 with a right-angled trapezoidal cross-section is also opened at the bottom of the plane flange 1, and the homemade annular seal 5 and the mounting groove 11 are installed correspondingly. When the homemade annular seal 5 is squeezed, the inclined surface of the homemade annular seal 5 is in close contact with the inclined surface of the mounting groove 11 opened by the plane flange 1 and the mounting plane 7, thereby forming a good seal. Even if the pressure is increased, the homemade annular seal 5 can ensure a close fit between the plane flange 1 and the oil cylinder 6, thereby achieving a good sealing effect.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An ultra-high pressure flat flange sealing device for a hydraulic cylinder, characterized in that: The invention comprises a plane flange (1) and a sealing component. The bottom ring of the plane flange (1) is provided with a mounting groove (11). The cross section of the mounting groove (11) is in the shape of a right-angled trapezoid. A sealing component is arranged in the mounting groove (11). The sealing component comprises an O-type sealing member (4) and a self-made annular sealing member (5). The cross section of the self-made annular sealing member (5) is in the shape of a right-angled trapezoid. The plane flange (1) is fixed to the oil port (8) of the oil cylinder by bolts (2).

2. The ultra-high pressure flat flange sealing device for a hydraulic cylinder according to claim 1, characterized in that: The two sides of the right-angled trapezoidal shape 1 are equal to the two sides of the right-angled trapezoidal shape 2, and the two bases of the right-angled trapezoidal shape 1 are not equal to the two bases of the right-angled trapezoidal shape 2.

3. The ultra-high pressure flat flange sealing device for a hydraulic cylinder according to claim 1, characterized in that: The O-type sealing member (4) is close to the right-angled side of the installation groove (11), and the self-made annular sealing member (5) is far away from the right-angled side of the installation groove (11).

4. The ultra-high pressure flat flange sealing device for a hydraulic cylinder according to claim 3, characterized in that: The contact surfaces of the O-type seal (4) and the self-made annular seal (5) are tightly fitted.

5. The ultra-high pressure flat flange sealing device for a hydraulic cylinder according to claim 1, characterized in that: A spring washer (3) is provided between the bolt (2) and the plane flange (1).

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