sealing device

Abstract

To provide a sealing device that allows for easy and hassle-free assembly of sealing components. [Solution] The sealing device of the present invention comprises a frame 3 through which a rotating shaft 2 is inserted, and a sealing member 10 that is incorporated into the frame 3 and slides against the rotating shaft 2. The frame 3 has an annular groove 9 coaxial with the rotating shaft 2 and an insertion hole 6 communicating with the groove 9. The sealing member 10 is an end-shaped member with a length greater than one full rotation of the rotating shaft 2, and is inserted from the insertion hole 6 so as to rotate in an annular manner along the outer circumference 2a of the rotating shaft 2, and is incorporated so as to fit into the groove 9. In this assembled state, the tapered surface 11 of the tip of the sealing member 10 makes surface contact with the inner circumference of the same sealing member 10, ensuring tight contact.

Description

Technical Field

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[0006]

[0001] The present invention relates to a sealing device for preventing leakage of a sealed fluid.

Background Art

[0002] Conventionally, as a sealing device for preventing leakage of a sealed fluid, in order to prevent leakage of the sealed fluid due to rotation of a rotating body, a combination of a non-contact labyrinth seal and a contact lip seal is known. For example, as shown in FIG. 5, a metal labyrinth seal 52 arranged in a non-contact state in sliding contact with the circumference of a rotating shaft 51, and a synthetic resin lip seal 53 arranged adjacent to the labyrinth seal 52 and in sliding contact with the circumference of the rotating shaft 51 in a contact state. A sealing device 50 is disclosed in which even if the sealed fluid leaks from the seal portion of the labyrinth seal 52, it can be sealed by the synthetic resin lip seal 53 (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, such a seal member of the lip seal is generally formed in an endless ring shape, and when incorporating this into the sealing device, it is necessary to deform the seal member during incorporation, so there is a problem that the incorporation work is troublesome.

[0005] ​​​​​The present invention has been made in view of this point, and aims to provide a sealing device that allows for easy and hassle-free assembly of a sealing member by inserting the ended sealing member through an insertion hole. [Means for solving the problem]

[0007] To achieve this objective, the first sealing device of the present invention is A frame through which the rotating shaft is inserted, The frame is equipped with a sealing member that is incorporated into the frame and slides against the rotating shaft, The aforementioned frame includes: An annular groove coaxial with the aforementioned rotation axis, An insertion hole communicating with the aforementioned groove is formed, The sealing member is The end-shaped member has a length that is greater than or equal to one rotation of the aforementioned axis. The device is characterized by being inserted through the insertion hole so as to rotate in an annular manner along the outer circumference of the rotating shaft, and then being assembled so as to fit into the groove. The second aspect of the present invention is characterized in that, in the first aspect of the present invention, the sealing member, when assembled into the frame, has a tip contact surface that makes surface contact with the inner circumference side of the same sealing member and is in close contact with it. The third aspect of the present invention is characterized in that, in the second aspect of the present invention, the contact surface at the tip of the sealing member has a tapered surface. The fourth aspect of the present invention is characterized in that, in the first aspect of the present invention, the sealing member is incorporated into the frame body, with its end exposed to the outside through the insertion hole. The fifth aspect of the present invention is characterized in that, in the fourth aspect of the present invention, the end of the sealing member is cut to form a tapered surface opposite to the tapered surface at the tip. The sixth aspect of the present invention is characterized in that, in the first aspect of the present invention, the frame is provided with a labyrinth seal portion adjacent to the sealing member that does not contact the rotating shaft. [Effects of the Invention]

[0008] According to the present invention, since the end-shaped sealing member is inserted and assembled through the insertion hole, a sealing device can be provided that allows for easy and hassle-free assembly of the sealing member. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing the schematic configuration of a sealing device, which is one embodiment of the present invention, before the sealing member is assembled. [Figure 2] (a) is a side cross-sectional view of the main part showing the schematic configuration of a sealing device according to one embodiment of the present invention, and (b) is an enlarged cross-sectional view of the main part with the sealing member assembled. [Figure 3] (a) is a perspective view showing the tip of the sealing member, and (b) is a schematic diagram showing the assembly portion of the sealing member. [Figure 4A] (a) is a schematic side cross-sectional view showing a state in which a sealing member is inserted into the frame of a sealing device, which is one embodiment of the present invention, and (b) is a schematic view of its main part. [Figure 4B] This is a schematic diagram showing the state in which the sealing member is being inserted. [Figure 4C] This is a schematic diagram showing the state in which the sealing member is inserted. [Figure 4D] This is a schematic diagram showing the end of the sealing member cut off. [Figure 5] This is a schematic longitudinal cross-sectional side view of the main part of a conventional sealing device. [Modes for carrying out the invention]

[0010] One embodiment of the present invention will be described below with reference to the drawings. This embodiment is merely one example of the present invention and is not intended to limit the scope of the invention; design modifications are possible within the scope of the present invention.

[0011] As shown in Figures 1 and 2, the sealing device 1 of this embodiment includes a frame 3 through which a rotating shaft 2 is inserted. Here, the rotating shaft 2 is assumed to rotate in only one direction (the L-direction). The frame body 3 has a labyrinth seal portion 5 that is non-contact with the rotating shaft 2 on the inner peripheral side facing the rotating shaft 2, and further, a seal member 10 that is in sliding contact with the rotating shaft 2 is incorporated adjacent to this labyrinth seal portion 5.

[0012] In this sealing device 1, the frame body 3 is made of metal (for example, aluminum) and is attached and fixed to the case 7 by fixing means 8 such as bolting at the flange portion 4. Then, the oil (lubricating oil) inside the case 7 is sealed so that it does not leak to the atmosphere side from the gap between the frame body 3 and the rotating shaft 2. In this embodiment, in FIGS. 1 and 2, toward the drawing, the left side of the sealing device 1 is the atmosphere side, and the right side of the sealing device 1 is the oil sealing side.

[0013] As shown in FIG. 2, the labyrinth seal portion 5 in the frame body 3 is configured by arranging in parallel a convex portion 5a facing the rotating shaft 2 with a minute gap d5 and a concave portion 5b having a spreading space. The convex and concave portions 5a and 5b have an effect of suppressing oil leakage due to the pressure loss when the fluid passes through.

[0014] Furthermore, a seal member 10 that is in sliding contact with the outer periphery 2a of the rotating shaft 2 without a gap is incorporated in the frame body 3 adjacent to the atmosphere side of this labyrinth seal portion 5. By incorporating such a seal member 10, the oil leakage that cannot be suppressed by the labyrinth seal 5 can be surely stopped by the seal member 10, and a high degree of sealing performance is ensured.

[0015] The seal member 10 is an end-shaped member having a length that goes around the rotating shaft 2 once or more, and this is inserted into the frame body 3 from the insertion hole 6 and incorporated. As the material of this seal member 10, PTFE, which is one of the fluororesins and is excellent in heat resistance and sliding characteristics, is preferably used.

[0016] As shown in Figure 4A, the frame 3 has an annular groove 9 and an insertion hole 6 that communicates with the groove 9. The groove 9 is formed on the inner surface of the frame 3 in an annular shape with the same axis Ax as the axis of the rotation shaft 2, and the sealing member 10 is inserted through the insertion hole 6 so that it fits into the groove 9. In this embodiment, the location of the insertion opening 6a, which is the entrance to the insertion hole 6 into which the sealing member 10 is inserted, is set on the frame 3 at a position on the atmospheric side of the flange portion 4.

[0017] The sealing member 10 is a terminal member having a length greater than one full rotation of the rotation axis 2, as shown in Figure 4D, and its cross-section is formed as a horizontally elongated rectangular cross-section with a width d1 and a thickness d2, as shown in Figure 2. This sealing member 10 is then fitted into the groove 9 formed circumferentially on the inner circumference of the frame 3 so as to fit without any gaps.

[0018] Here, the width d1 of the sealing member 10 is approximately the same as the inner width d3 of the groove 9, and therefore the sealing member 10 is incorporated into the frame 3 so as to fit snugly into the groove 9 without any gaps. Furthermore, the thickness d2 of the sealing member 10 is greater than the depth d4 of the groove 9, and therefore the sealing member 10 protrudes from the inner circumference of the frame 3 by a small gap d5, sliding in gapless contact with the outer circumference 2a of the rotating shaft 2, thereby performing a sealing function.

[0019] In this sealing device 1, the insertion hole 6 is formed such that the insertion direction of the sealing member 10 coincides with the rotation direction L of the rotating shaft 2. That is, in this embodiment, as shown in Figure 4A, the rotation direction L of the rotating shaft 2 is counterclockwise, and the insertion hole 6 is formed in the tangential direction on the upper right side of the figure so that the insertion direction of the sealing member 10 coincides with the rotation direction L of the rotating shaft 2. Furthermore, the insertion hole 6 is formed to have a cross-section that is approximately the same size as, or slightly larger than, the cross-section of the sealing member 10, in order to allow the sealing member 10 to be inserted.

[0020] As shown in Figure 4A(b), the insertion hole 6 and groove 9 of the frame 3 intersect with the outer circumference 2a of the rotation shaft 2 in the radial direction (vertically upward in the drawing) from the axis Ax of the rotation shaft 2, with the bottom surface of the insertion hole 6 being tangent (straight line) at an angle θ2 (90 degrees). This position of the insertion hole 6 allows for the insertion of the sealing member 10 without difficulty. Note that the position of the insertion hole 6 is not limited and can be changed as appropriate depending on how the sealing device 1 is fixed, and any position is within the scope of the present invention.

[0021] As shown in Figure 3(a), the sealing member 10 has a tapered surface 11 at the tip of its outer circumference 10a. When assembled into the outer frame 3, as shown in Figure 3(b), this tapered surface 11 acts as a contact surface 11a, making surface contact with the inner circumference 10b of the same sealing member 10 and ensuring tight contact. The taper angle θ1 of this tapered surface 11 is appropriately set according to the diameter of the rotation shaft 2.

[0022] Next, the assembly process of the sealing member 10 in the sealing device 1 of this embodiment will be described in detail with reference to Figures 4A to 4D. The sealing member 10 used in this embodiment, although not specifically shown in the illustration, is formed in a long length that allows for multiple installations and is wound into a roll.

[0023] First, as shown in Figure 4A(a), with the rotating shaft 2 inserted through the frame 3, the sealing member 10 is inserted into the insertion hole 6 through the insertion opening 6a with the tapered surface 11 at its tip facing upwards.

[0024] The sealing member 10, inserted through the insertion opening 6a of the insertion hole 6, is inserted in a ring-like manner along the outer circumference 2a of the rotating shaft 2, as shown in Figure 4B, and is assembled to fit into the groove 9 (the figure shows the sealing member 10 inserted approximately halfway). In this case, inserting the sealing member 10 while rotating the rotating shaft 2 in the L direction makes the insertion of the sealing member 10 smoother.

[0025] Furthermore, when inserting the sealing member 10, a lubricant may be applied to the sealing member 10. This allows for smoother insertion of the sealing member 10 and reduces frictional resistance against the rotating shaft 2 after the sealing member 10 has been installed.

[0026] The sealing member 10, inserted through the insertion hole 6, eventually travels around the rotation axis 2 as shown in Figure 4C, until its tip abuts against the inner circumference 10b of the same sealing member 10. When it can no longer be inserted further, it becomes fully integrated into the groove 9 of the frame 3.

[0027] In this state, where the sealing member 10 is fully incorporated into the frame 3, as shown in Figure 3(b), the tapered surface 11 at the tip of the sealing member 10 makes full surface contact with the inner circumference 10b of the same sealing member 10 as the contact surface 11a, creating a tight, gap-free seal, making the sealing member 10 appear as if it were an endless ring.

[0028] Finally, as shown in Figure 4D, the sealing member 10 is cut so that its end is exposed to the outside through the insertion opening 6a. In other words, the seal member 10 is cut so that a predetermined length of the end of the seal member 10 is exposed to the outside. In this case, the end of the seal member 10 is cut diagonally so that a downward tapered surface 12 is formed, opposite to the tip. This is because a tapered surface 11 will be formed at the tip of the seal member 10 to be used next. With this type of cut, it is not necessary to recut the tip when inserting the seal member 10 next time, thus eliminating one step in the work process.

[0029] As described above, in this sealing device 1, the ended sealing member 10 is inserted through the insertion hole 6 and assembled, so the assembly of the sealing member 10 can be done easily and without hassle. Here, the sealing member 10 can be incorporated to accommodate rotating shafts 2 of any diameter, thus offering high versatility.

[0030] Furthermore, in this sealing device 1, with the sealing member 10 assembled, the insertion direction of the sealing member 10 coincides with the rotation direction L of the rotating shaft 2. As a result, the sealing member 10 does not come out of the insertion opening 6a even when the rotating shaft 2 rotates, and the assembled state is reliably maintained. Moreover, as the rotating shaft 2 rotates, the tapered surface 11 at the tip of the sealing member 10 comes into strong contact with the inner circumference 10b of the sealing member 10, thus providing an effect of further enhancing the sealing performance.

[0031] Furthermore, in this sealing device 1, if the sealing member 10 becomes worn, it can be easily replaced by pinching the end portion of the sealing member 10 that is exposed outside the frame 3 and pulling the sealing member 10 out of the frame 3.

[0032] Furthermore, this sealing device 1 has a labyrinth seal section 5 adjacent to the sealing member 10 that does not contact the rotating shaft 2. By inserting and assembling the sealing member 10, the minute gap d5 between the rotating shaft 2 and the labyrinth seal section 5 is automatically defined, thus eliminating the need for a centering means between the rotating shaft 2 and the frame 3. [Explanation of Symbols]

[0033] 1 Sealing device 2 rotation axes 3 Frame 5 Labyrinth seal section 6 Insertion holes 6a Insertion port 9. Grooves 10 sealing member 10a Outer periphery 10b Inner side 11 Tapered surface at the tip 11a Contact surface 12 Tapered surface at the end

Claims

1. A frame through which the rotating shaft is inserted, The frame is equipped with a sealing member that is incorporated into the frame and slides against the rotating shaft, The aforementioned frame includes: An annular groove coaxial with the aforementioned rotation axis, An insertion hole communicating with the aforementioned groove is formed, The sealing member is The end-shaped member has a length that is greater than or equal to one rotation of the aforementioned axis. A sealing device characterized by being inserted through the insertion hole so as to rotate in an annular manner along the outer circumference of the rotating shaft, and then being assembled so as to fit into the groove.

2. The sealing device according to claim 1, characterized in that when the sealing member is assembled into the frame, the contact surface of the tip of the sealing member makes surface contact with the inner circumference side of the same sealing member and is in close contact with it.

3. The sealing device according to claim 2, characterized in that the contact surface at the tip of the sealing member has a tapered surface.

4. The sealing device according to claim 1, characterized in that the sealing member is incorporated into the frame and its end is exposed to the outside through the insertion hole.

5. The sealing device according to claim 4, characterized in that the end of the sealing member is cut to form a tapered surface opposite to the tapered surface at the tip.

6. The sealing device according to claim 1, characterized in that the frame is provided with a labyrinth seal portion adjacent to the sealing member that does not contact the rotating shaft.

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