JP2013155767A - Vane seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vane seal that reduces internal leakage of a rotary actuator.SOLUTION: A vane seal for a rotary actuator includes: a slide-contact ring 11 formed in the shape of an elongated rectangular closed ring and made of low-friction resin; and an elastic rubber material 12 with an outer circumferential surface covered with a slide-contact ring 11 and having a pressure-receiving recessed groove. The vane seal for the rotary actuator is mounted on a sealing recessed groove 8 which is straight in an axial direction and formed in a vane 6 on the side of a rotary main shaft 7 or a shoe on the side of a casing, and is formed in a belt-like shape as a whole.

Description

  The present invention relates to a vane seal for a rotary actuator.

  Conventional rotary actuators have been equipped with a portal vane seal on the rotary vane that oscillates a predetermined angle in response to fluid pressure, and a (fixed) vane seal on the casing-side sole. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No. 2-81903

By the way, the conventional vane seal is generally formed of a resin such as PTFE and has a rectangular cross section and an overall portal shape.
In such a vane seal having an overall portal shape, it is extremely difficult to reduce internal leakage (internal leakage) because there are particularly two corners and the ends of both legs. It has been conventionally thought.

  However, recently, there has been a growing demand for higher pressures in rotary actuators, and if there are many internal leaks, problems such as abnormal oil temperature rise, energy loss, inaccuracy and reliability of operation. However, it is getting closer recently.

  Therefore, the present invention solves such a conventional problem, reduces internal leakage of the rotary actuator, and accordingly, suppresses the temperature rise of the hydraulic oil, reduces energy loss, and operates. An object of the present invention is to provide a vane seal that improves the accuracy and reliability of the seal and exhibits a sealing property that can withstand high pressure.

  Accordingly, the present invention provides an elastic rubber material having a pressure-receiving concave groove portion which is provided with a sliding contact ring made of a low-friction resin, which is an elongated rectangular closed ring, and whose outer peripheral surface is covered with the sliding contact ring. And is formed in a whole strip plate type that is attached to a vane on the rotary main shaft side or a shoe on the casing side in a groove formed for straight sealing in the formed axial direction.

  In addition, a reinforcing core material having a cross-shaped cross section in which the corner portion is cut out in a small rectangular shape from a band plate material having a corner portion along the periphery, and the elastic rubber material is a closed rectangular ring shape, The elastic rubber material and the sliding contact ring are fitted in the fitting recess cut out in the small rectangular shape while closely fitting inside the sliding contact ring.

  Further, the reinforcing core material is provided with a square bar-like reinforcing core material, and the reinforcing core material is integrated in a surrounding shape with a closed annular elastic rubber material having a thickness dimension equal to the thickness dimension of the reinforcing core material. The outer peripheral surface of the elastic rubber material is covered with a sliding contact ring.

  Further, the elastic rubber material is composed of only the sliding contact ring, and the sliding contact ring has a single character in cross section, and the thickness dimension thereof and the thickness dimension of the elastic rubber material are set to be the same. On the pressure receiving surface side of the material, a pressure receiving concave groove portion is disposed in a closed ring shape along the inside of the sliding contact ring.

  In addition, regarding the depth dimension of the pressure receiving groove provided in the elastic rubber material, the corner corresponding depth dimension corresponding to the four vane seal corners of the whole band plate type excludes the vane seal corners. It is set larger than the side corresponding depth dimension.

Further, At a closed circular said sliding ring elongated rectangle, to form a small bend radius of a predetermined radius R ₁₁ at the four corners of the inner circumferential surface, moreover, the thickness of the sliding ring W ₁₁ is set as 1/3 · W ₁₁ ≦ R ₁₁ ≦ W ₁₁ .

According to the present invention, the conventional portal vane seal is inevitable in the conventional portal vane seal. It can be significantly reduced by the rubber material.
Moreover, since the groove for sealing on the vane or shoe side has a simple straight shape, machining becomes easy. Furthermore, the elastic rubber material receives fluid pressure and presses it against the mating surface via the sliding contact ring, so that it is in close contact with the contact surface pressure corresponding to the level of the fluid pressure, and the sealing performance (sealing performance) is significantly improved. it can. Further, the protrusion of the rubber material is prevented by the sliding contact ring, and the life is long.
In addition, the vane seal of the present invention is entirely a band plate type (that is, a rectangular cassette type), is easy to be attached to a vane or a shoe, and has extremely high reliability regarding sealing performance (sealing performance) over a long period of use.

It is a simplified sectional view for explaining a schematic structure of the present invention. It is a simplified perspective explanatory view for explaining a schematic configuration of the present invention. FIG. 3 is a cross-sectional view of a main part showing an intermediate state of the embodiment of the present invention. It is principal part sectional drawing of one Embodiment of this invention. It is principal part sectional drawing of one Embodiment of this invention. It is a front view which shows one Embodiment of the vane seal of this invention. It is the (VII-VII) cross-sectional enlarged view of FIG. It is the (VIII-VIII) cross-sectional enlarged view of FIG. It is the figure which illustrated the sliding contact ring of 1st Embodiment. It is the figure which illustrated the elastic rubber material of a 1st embodiment. It is the figure which illustrated the reinforcement core material of 1st Embodiment. FIG. 7 is an enlarged view showing the second embodiment and corresponding to the (VII-VII) cross section of FIG. 6. It is an enlarged view corresponding to the (VIII-VIII) section of Drawing 6 while showing a 2nd embodiment. It is an expanded sectional view showing a 3rd embodiment. It is an expanded sectional view showing a 4th embodiment.

Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
As shown in the simplified diagram of FIG. 1, the rotary actuator R includes a casing 1 and a rotary main body 2. The casing 1 has a cylindrical wall portion 1A and left and right side wall portions 1B and 1B (closing both ends). In addition, shoes 4, 4 and 4 are projected from the inner peripheral surface 10 of the cylindrical wall portion 1A in a radially inward direction with a central angle of 120 °.
The rotary main body 2 includes a rotating main shaft 7 having vanes 6, 6 and 6 projecting radially outward at a central angle of 120 °.

As shown in FIGS. 1 to 5, each of the shoe 4 on the casing 1 side and the vane 6 on the rotary spindle 7 side has a straight groove 3 for sealing in the axial direction L ₇ . 8 is formed. L _O indicates the axis of the rotation main shaft 7, and the axial direction L ₇ is a direction parallel to the axis L _O.

  The movable-side vane seal 9 is mounted in the straight concave groove 8 of the vane 6 of the rotary main shaft 7 (the vane seal 9 is simply illustrated with a two-dot chain line in FIGS. 1 and 2). The stationary-side vane seal 5 is mounted in the straight concave groove 3 of the shoe 4 on the casing 1 side (in FIG. 1 and FIG. 2, the vane seal 5 is simply illustrated with a two-dot chain line).

  In the first embodiment shown in FIGS. 3 to 11, the vane seals 9 and 5 include an elongated rectangular closed ring sliding contact ring 11 made of PTFE, polyamide resin, or the like. A low friction and wear resistant resin such as polyethylene resin is preferred.

  Reference numeral 12 denotes an elastic rubber material whose outer peripheral surface 13 is covered with the sliding contact ring 11, and has a substantially U-shaped cross-sectional shape having a pressure receiving groove portion 15. As the material, a conventionally known sealing rubber is used according to the fluid used.

  Next, 16 shows a cross-sectional reinforcing core material, and its cross-sectional shape will be described with reference to FIG. 11 (C). The corner portion 17 is cut into a small rectangle (the small rectangular shape 19 indicated by a two-dot chain line in FIG. 11C is cut out) to form a cross-shaped cross section (see FIG. 11B).

  That is, as shown in FIGS. 11 (A), 11 (B), and 11 (C), the corner portion 17 is cut out in the small rectangular shape 19 (over the entire circumference) to form the fitting recess 20. The reinforcing core 16 is made of a material having sufficient strength and rigidity, for example, metal or hard resin.

The cross section of the cross section shown in FIG. 11 is provided with elongated rectangular closed annular elastic rubber members 12 and 12 (FIG. 10) in elongated rectangular fitting recesses 20 and 20 formed over the entire circumference of both front and back surfaces. (Refer to FIG. 7 and FIG. 8), and the concave groove portion 15 of each elastic rubber material 12 faces outward in the left-right direction so that pressure can be received. Further, as shown in FIG. 9, the sliding ring 11 has a single character in cross section, and the whole is in the form of an elongated rectangular closed ring that is tightly fitted to the outside of the elastic rubber material 12, so that the entire vane seals 5 and 9 are formed. Is assembled into a fixed strip type (cartridge type) as shown in FIGS.
The elongated rectangular whole strip type vane seals 9 and 5 assembled in this way are mounted in the sealing grooves 8 and 3 as shown in FIGS. 4, 5 and 1 to 3.

  By the way, in 1st Embodiment shown in FIGS. 7-11, the elastic rubber material 12 of U-shaped cross section has the gradient 21 on the outer peripheral surface side (in a free state and a state as a cartridge). The formed sliding contact ring 11 is simply in a pressure contact state and is not bonded.

  On the other hand, in the second embodiment shown in FIGS. 12 and 13, the inner surface of the slanted single-character sliding contact ring 11 that matches the gradient 21 of the elastic rubber material 12, and the elastic rubber material 12 The outer surface with the gradient 21 is integrated by adhesion or fusion. In FIGS. 12 and 13, the sliding contact ring 11 has a parallelogram shape in the cross-sectional shape, the outer corner portion 22 has an acute angle, and the sliding contact surface in the usage state attached to the vane 6 and the shoe 4. There is an advantage that the sealing performance is improved by contacting with high contact pressure.

  Next, in the first and second embodiments (shown in FIGS. 1 to 13), regarding the depth dimension of the pressure receiving concave groove portion 15 of the elastic rubber material 12, four of the whole strip plate type are used. The corner-corresponding depth dimension Ez corresponding to the vane seal corners Z, Z, Z, Z is set larger than the side-corresponding depth dimension Ey excluding the vane seal corners Z, Z, Z, Z.

  That is, it is obvious by referring to FIG. 8 or FIG. 13 showing an enlarged sectional view of (VIII-O-VIII) in FIG. 6 and FIG. 7 or FIG. 12 showing an enlarged sectional view of (VII-VII) in FIG. As described above, the depth dimension Ez of the recessed groove portion 15 of the vane seal corner portion Z is set to be larger than the depth dimension Ey of the remaining portion (corresponding to the side), and under a pressure receiving state in which pressure from the fluid is received ( The concave groove portion 15 of the elastic rubber material 12 (as a U-shaped packing) generates a large external force in the direction of the opening leg, and strongly presses the sliding contact ring 11, so that the elasticity of the rubber material 12 itself can be seen as shown in FIG. In the corner portion Z where the urging force is slightly weakened, the sealing performance (sealing performance) in the corner portion Z can be enhanced in a pressure receiving state where the fluid pressure is received.

Further, as shown in FIG. 9, in the elongated rectangular closed ring sliding contact ring 11, small curved round portions having a predetermined radius R ₁₁ are formed at the four corners 11 C, 11 C, 11 C, 11 C of the inner peripheral surface. In addition, when the thickness dimension of the sliding contact ring 11 is W ₁₁ , it is desirable to set 1/3 · W ₁₁ ≦ R ₁₁ ≦ W ₁₁ . The reason is that the rigidity of the four vane seal corners Z, Z, Z, Z is increased, and the elastic force from the inner elastic rubber material 12 is sufficiently transmitted to the mating surface (corner), so that the sealing performance is somewhat It is possible to improve the sealing performance at the corner portion Z, which tends to become unstable. (Configuration of forming a small curved rounded portion of such predetermined radius R ₁₁ at the corner 11C also with respect to FIGS. 12-15, Applied free.)

Next, the third embodiment shown in FIG. 14 will be described. The shape of the reinforcing core material 16 is a square bar shape (quadron shape), and this reinforcing core is formed by a closed annular elastic rubber material 12 having a thickness dimension W ₁₂ equal to the thickness dimension W ₁₆ of the reinforcing core material 16. In this configuration, the material 16 is integrated as a surrounding shape, and the outer peripheral surface 23 of the elastic rubber material 12 is covered with a sliding contact ring 11 having a single cross section. The entire front shape of the sliding contact ring 11 looks the same as in FIG. Further, the inner peripheral surface of the sliding contact ring 11 and the outer peripheral surface 23 of the elastic rubber material 12 can be integrated by adhesion, fusion, or the like, or simply assembled in a pressure contact manner. Can be selected.

Incidentally, At a 14, for the thickness dimension _{W 11} of the sliding ring 11, preferably the same as the thickness dimension _{W 16} and _{W 12.} In addition, in FIG. 14, as indicated by a two-dot chain line (as already described in FIGS. 6, 8, and 13), the depth dimension of the concave groove portion 15 of the corner portion Z (angle corresponding depth). The height dimension Ez is set larger than the side corresponding depth dimension Ey (shown by a solid line).

  Further, in FIG. 14, as shown by a two-dot chain line, both ends of the outer surface of the slidable ring 11 are slightly protruded from the triangular mountain shapes 24, 24 to increase the contact surface pressure to the mating surface. It is also desirable to improve sealing performance.

  Next, the fourth embodiment shown in FIG. 15 will be described. The vane seals 5 and 9 have a configuration in which the reinforcing core member 16 of the first to third embodiments described above is omitted. That is, it is composed only of the elastic rubber material 12 and the sliding contact ring 11.

Sliding ring 11, as cross section character shape, the thickness dimension W ₁₂ of the thickness dimension W ₁₁ and the elastic rubber member 12 in the same (equal) to set. In addition, a pressure receiving groove 15 is disposed on the pressure receiving surfaces 25 and 25 of the elastic rubber material 12 in a closed ring shape along the inside of the sliding contact ring 11. More specifically, it is a configuration in which the outer circumferential surface 23 of the elastic rubber material 12 of a sizing band plate type is covered with an elongated rectangular sliding contact ring 11 that looks the same as in FIG. They may be integrated by fusion or the like, or simply assembled in a close fitting state (pressure contact).

  Further, in FIG. 15, as indicated by a two-dot chain line (as described in FIGS. 6, 8, 13, and 14), the depth dimension of the concave groove 15 of the corner Z (corresponding to the corner) The depth dimension Ez is set larger than the side corresponding depth dimension Ey (shown by a solid line). Further, as shown by a two-dot chain line in FIG. 15, it is desirable that both ends of the outer surface of the slidable contact ring 11 protrude slightly into the triangular mountain shapes 24, 24 to increase the contact surface pressure on the mating surface.

  The present invention is not limited to the illustrated embodiment, and the design can be freely changed. The number of vanes 6 and shoes 4 can be single or two, and can be four or more. Is possible. Also, each of the vanes 6 and the shoes 4 is provided with two sealing grooves 8 and 3, and the two vane seals 9 and 5 are attached to one vane 6 and one shoe 4. You may do it.

As described above, the present invention is provided with the sliding contact ring 11 which is an elongated rectangular closed ring made of a low friction resin, and the outer circumferential surface 13 is covered with the sliding contact ring 11. It is provided with an elastic rubber material 12 having a groove portion 15, and is formed in a straight sealing groove 3, 8 in the axial direction L ₇ formed on the vane 6 on the rotating spindle 7 side or the shoe 4 on the casing 1 side. Since it is a structure formed in the entire band plate type to be mounted, the processing of the groove for sealing 3 and 8 becomes easy, and in particular, compared with the conventional gate type vane seal, the corners of the gate type and both legs The problem of internal leakage from the end of the section is solved, and a significant reduction in internal leakage (internal leakage) can be achieved. Therefore, a vane seal excellent in sealing performance (sealing performance) can be realized for a rotary actuator.
Further, since the elastic rubber material 12 receives fluid pressure and presses the sliding contact ring 11 against the mating surface, the elastic rubber material 12 is in close contact with the contact surface pressure corresponding to the change in the fluid pressure and has excellent sealing performance (sealing performance). Especially, it is a vane seal that can cope with high pressure.
In addition, since it is a whole strip plate type (that is, a rectangular cassette type), it is easy to attach to the groove 8 and 3 for sealing, and the reliability (in terms of sealing performance) is extremely high and durable over a long period of use. Also excellent.

  In addition, the present invention includes a reinforcing core member 16 having a cross-shaped cross section obtained by cutting a corner portion 17 into a small rectangular shape 19 from a band plate member 18 having a corner portion 17 along a peripheral edge, and the elastic rubber material 12 includes: As an elongated rectangular closed ring, the elastic rubber material 12 and the sliding contact ring 11 are fitted in the fitting recess 20 cut out in the small rectangular shape 19 while being closely fitted inside the sliding contact ring 11. Due to the configuration, the elastic rubber material 12 and the sliding contact ring 11 are always kept in a stable posture by the reinforcing core material 16, and the reliability with respect to the sealing performance is higher, and problems such as the biting of the elastic rubber material 12 are prevented. Durability is also improved.

In addition, the present invention includes a square-bar-shaped reinforcing core material 16 and surrounds the reinforcing core material 16 with a closed annular elastic rubber material 12 having a thickness dimension W ₁₂ equal to the thickness dimension W _{16 of the} reinforcing core material 16. And the outer peripheral surface 23 of the elastic rubber material 12 is covered with the sliding contact ring 11 having a single cross-sectional shape, which is suitable for a small rotary actuator and is easy to manufacture.

Further, formed only elastic rubber member 12 and the sliding contact ring 11, as sliding ring 11 cross-section character shape, and sets the thickness dimension W ₁₂ of the thickness dimension W ₁₁ and the elastic rubber member 12 in the same Since the pressure-receiving concave groove 15 is disposed on the pressure-receiving surface side 25 of the elastic rubber material 12 in a closed ring shape along the inner side of the sliding contact ring 11, it is easy to reduce the size of the elastic rubber material 12. It is suitable and easy to manufacture.

  In addition, regarding the depth dimension of the pressure receiving recessed groove portion 15 provided in the elastic rubber material 12, the corner corresponding depth dimension Ez corresponding to the four vane seal corner portions Z, Z, Z, Z of the entire band plate type is obtained. The vane seal corners Z, Z, Z, and Z are configured to be larger than the side-corresponding depth dimension Ey, so that they can stably slide and exhibit good sealing performance. In comparison, the sealing performance of the corner portion Z, which tends to be somewhat unstable, can be improved, and it can be brought into pressure contact with a corner portion of the mating surface with sufficient contact surface pressure to exhibit excellent sealing performance.

Further, in the elongated rectangular closed ring sliding contact ring 11, small curved round portions having a predetermined radius R ₁₁ are formed at the four corners 11 C, 11 C, 11 C, 11 C of the inner peripheral surface, and the sliding contact ring Assuming that the thickness dimension of ₁₁ is W ₁₁ , if the configuration is set as 1/3 · W ₁₁ ≦ R ₁₁ ≦ W ₁₁ , the sealing performance of the corner Z, which tends to be slightly unstable, can be improved, and sufficient Pressing against the corner of the mating surface with contact surface pressure, it exhibits excellent sealing performance.

DESCRIPTION OF SYMBOLS 1 Casing 3, 8 Sealing groove 4 Shoe 5, 9 Vane seal 6 Vane 7 Rotating spindle 11 Sliding contact ring 11C Corner 12 Elastic rubber material 13 Outer peripheral surface 15 Pressure receiving groove 16 Reinforcement core 17 Corner 18 Band plate 19 small rectangular 20 loading cavity 23 outer peripheral surface 25 pressure-receiving surface side Z vane seal corner L ₇ axially Ey sides corresponding depth Ez angle corresponding depth W _11, W _12, W ₁₆ thickness dimension R ₁₁ radius

Claims (6)

An elongated rectangular closed ring having a sliding contact ring (11) made of a low-friction resin, and a pressure receiving groove (15) having an outer peripheral surface (13) covered with the sliding contact ring (11). ) In the axial direction (L ₇ ) formed on the vane (6) on the rotating main shaft (7) side or the shoe (4) on the casing (1) side. A vane seal for a rotary actuator, characterized in that it is formed in an entire strip plate type that is mounted in a straight groove (3) (8) for sealing. A reinforcing core material (16) having a cross-shaped cross section in which the corner portion (17) is cut into a small rectangular shape (19) from a strip plate material (18) having a corner portion (17) along the periphery,
The elastic rubber material (12) is in the form of an elongated rectangular closed ring and is closely fitted inside the sliding contact ring (11), and the elastic rubber material (12) and the sliding contact ring (11). The vane seal for a rotary actuator according to claim 1, which is fitted in a fitting recess (20) cut out in the small rectangular shape (19). A square-bar-shaped reinforcing core member (16) is provided, and the reinforcing core member (16) is reinforced by a closed annular elastic rubber member (12) having a thickness dimension (W ₁₂ ) equal to the thickness dimension (W ₁₆ ) of the reinforcing core member (16). The rotary actuator according to claim 1, wherein the core material (16) is integrated into a surrounding shape and the outer peripheral surface (23) of the elastic rubber material (12) is covered with a sliding contact ring (11) having a single cross section. Vane seal. Said elastic rubber member (12) is composed of the sliding contact ring only (11), as the sliding ring (11) is cross-sectional character shape, a thickness dimension _{(W 11)} and the elastic rubber member (12) Are set to the same thickness dimension (W ₁₂ ), and the pressure-receiving concave portion is formed in a closed ring along the inner side of the sliding contact ring (11) on the pressure-receiving surface side (25) of the elastic rubber material (12). The vane seal for a rotary actuator according to claim 1, wherein the groove (15) is disposed.   Regarding the depth dimension of the pressure receiving groove (15) provided in the elastic rubber material (12), the four vane seal corners (Z) (Z) (Z) (Z) of the whole band plate type are used. The corresponding corner-corresponding depth dimension (Ez) is set larger than the side-corresponding depth dimension (Ey) excluding the vane seal corners (Z) (Z) (Z) (Z). , 2, 3 or 4 vane seal for rotary actuator. In the elongate rectangular closed ring-shaped sliding contact ring (11), small curvilinear round portions having a predetermined radius (R ₁₁ ) are provided at the four corners (11C) (11C) (11C) (11C) of the inner peripheral surface. Further, if the thickness dimension of the sliding contact ring (11) is (W ₁₁ ), it is set as 1/3 · W ₁₁ ≦ R ₁₁ ≦ W _11. Or the vane seal for rotary actuators of 5.

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