JP5639767B2 - Seal groove - Google Patents

Description

The present invention relates to a seal groove for fitting a sealing material, in particular, curved and when the plane to form a seal groove in member surface of the smooth connected surface configuration, resulting seal grooves of the same cross-sectional shape curved in the plane In this way, the sealing performance can be improved.

  For example, the gate valve of Patent Document 1 uses a sealing material (4) made of an O-ring, and the sealing material (4) is used on the sealing surface (1) of the closing member (3) using a groove (not shown). (Refer to FIG. 1 (b) of the same document, page 4, upper left column, lines 17-18).

  The dovetail groove is well known as a groove (hereinafter referred to as “seal groove”) used for mounting the sealing material (4) made of an O-ring (see, for example, Patent Document 2).

  By the way, the attachment surface of the sealing material (4) of Patent Document 1, that is, the sealing surface (1) has a surface configuration in which the curved surface S2 and the flat surface S1 are smoothly connected as shown in FIG. When forming a known dovetail groove as a continuous seal groove across the flat surface S1 and the curved surface S2, an end mill (hereinafter referred to as a “dove groove cutter 30”) provided with a blade portion having the same cross-sectional shape as the cross-sectional shape of the dovetail groove. In the plane S1, the dovetail cutter 30 is translated along the plane S1, and when the curved surface S2 is reached, the dovetail cutter 30 is turned around a point P that is a predetermined distance away from the curved surface S2. Like that.

  However, the blade portion 30A at the tip of the swiveling dovetail cutter 30 moves with the rear portion protruding slightly outward rather than the front portion in the turning direction as shown in FIG. Therefore, compared to the bottom surface of the dovetail groove formed on the plane S1 as shown in FIG. 4B, the bottom surface of the dovetail groove formed on the curved surface S2 becomes a circular arc surface as shown in FIG. Dovetail grooves (seal grooves) having the same cross-sectional shape cannot be obtained by S1 and curved surface S2.

  When the sealing material (4) is attached using the dovetail groove (seal groove) continuously formed over the flat surface S1 and the curved surface S2 as described above, the sealing material (4) is attached to the flat surface S1 and the curved surface S2. It is fitted into the groove (seal groove) by press fitting, and the fitted sealing material (4) is installed so that the tip of the seal material protrudes from the flat surface S1 and the curved surface S2. However, as described above, if the dovetail groove (seal groove) is deep in the curved surface S2, In addition, the sealing material (4) protruding from the curved surface S2 is lower than the other portions, and the protruding height of the sealing material varies, resulting in problems such as a decrease in sealing performance.

  In addition, the code | symbol in the said parenthesis is a code | symbol used by patent document 1. FIG.

JP-A-2-113178

JP 2003-240123 A

The present invention has been made in order to solve the above-mentioned problems, and the object thereof is, for example, when a seal groove is formed on a member surface having a surface configuration in which a curved surface and a flat surface are smoothly connected to each other. It is to provide a seal groove having the same cross-sectional shape.

To achieve the above object, the present invention provides a plane which curved and seal groove formed for the that led to smooth as a groove for fitting a sealing material, said sealing groove, the reverse Ω shape The vicinity of the entrance is constricted, and the back has a circular cross-sectional shape wider than the constriction near the entrance , and the groove cutter for forming the seal groove of the cross-sectional shape is translated along the plane in the plane, and In the curved surface, the groove groove cutter is turned around a point separated from the curved surface by a predetermined distance so that the cross-sectional shape of the seal groove is the same between the flat surface and the curved surface. .

  In the present invention, “as in the reverse Ω shape” means that the reverse Ω shape is included as an example of the cross-sectional shape of the seal groove, and the cross-sectional shape of the seal groove is limited to the reverse Ω shape only. is not. If the vicinity of the entrance to the seal groove is constricted and the back of the seal groove has a circular cross-sectional shape wider than the constriction near the entrance, the seal groove is included in the “seal groove” of the present invention.

  According to the present invention, as a specific cross-sectional shape of the seal groove, a “circular cross-sectional shape in which the vicinity of the entrance is constricted and the back is wider than the constriction in the vicinity of the entrance as in an inverted Ω shape” is adopted. For this reason, when a seal groove is formed on a member surface having a surface configuration in which a curved surface and a flat surface are smoothly connected to each other, a seal groove having the same cross-sectional shape can be obtained on both a flat surface and a curved surface, like a conventional seal groove (ant groove). There is no difference in depth between the flat surface and the curved surface. Therefore, the protruding height of the sealing material protruding from the seal groove becomes uniform, and the sealing performance can be improved.

(A) is sectional drawing of the seal groove which concerns on this invention, (b) is a front view of the groove cutter for forming the seal groove of (a), (c) is the sealing material inserted in the seal groove which concerns on this invention (D) is sectional drawing of the state which fitted the sealing material of (c) in the sealing groove | channel of (a). The groove cutter operation explanatory view at the time of forming the seal groove of Drawing 1 (a) on the member surface where the plane and the curved surface were connected smoothly using the groove cutter of Drawing 1 (b). The perspective view of the gate valve (open state) to which the sealing groove | channel of Fig.1 (a) and the sealing material of FIG.1 (c) are applied. The dovetail cutter operation explanatory view when forming a seal groove using a dovetail cutter on the member surface where the plane and the curved surface are smoothly connected.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1A is a cross-sectional view of a seal groove according to the present invention. The seal groove 1 shown in the figure has a circular cross-sectional shape in which the vicinity of the inlet 1A is constricted and the back 1B is wider than the constriction of the inlet 1A, as in an inverted Ω shape.

  FIG.1 (b) is explanatory drawing of the groove cutter for forming the seal groove of Fig.1 (a). The groove portion 3A of the groove cutter 3 has a shape in which a sphere is coupled to the tip of the truncated cone, and a portion of the truncated cone and the sphere is sharply cut out so as to become a blade. The cross-sectional shape near the boundary between the truncated cone and the sphere corresponds to the constricted cross-sectional shape near the entrance 1A of the seal groove 1, and the cross-sectional shape of the sphere is the cross-sectional shape (circular) at the back 1B of the seal groove 1. It corresponds. Accordingly, by cutting the member surface with the blade near the boundary between the truncated cone and the sphere, the constriction near the inlet 1A of the seal groove 1 is formed, while the member surface is cut with the blade at the sphere portion, The cross-sectional shape (circular shape) of the back 1B of 1 is formed.

  FIG. 2 is an explanatory diagram of the groove cutter operation when the seal groove 1 of FIG. 1A is formed on the member surface in which the flat surface S1 and the curved surface S2 are smoothly connected by using the groove cutter 3 of FIG. It is. In the example of FIG. 2, the groove cutter 3 of FIG. 1B is moved in the order of the curved surface S2, the flat surface S1, the curved surface S2, and the flat surface S1 from the plane S1 positioned at the top in the figure to form the seal groove 1. In the plane S1, the groove cutter 3 is translated along the plane S1, and in the curved surface S2, the groove cutter 3 is turned around a point P that is a predetermined distance away from the curved surface S2.

  As described above, the seal groove 1 of FIG. 1A has a circular cross-sectional shape at the back 1B, and the cross-sectional shape of the cutting edge 3A (spherical body) of the groove cutter 3 is also corresponding to this. It is circular (see FIG. 1B). For this reason, the cross-sectional shape of the back 1B of the seal groove 1 is circular regardless of the flat surface S1 or the curved surface S2. Further, as shown in FIG. 2, the front end and the rear portion in the turning direction of the blade 3A tip of the groove cutter 3 turning on the curved surface S2 move along the same locus. At this time, unlike the conventional dovetail cutter 30 of FIG. 4, the rear part does not protrude outward than the front part in the turning direction, so that the cross-sectional shape of the seal groove 1 formed on the flat surface S1 and the curved surface S2 Is the same as A and B in FIG.

FIG. 1 (c) is a cross-sectional view of a sealing material fitted into the seal groove according to the present invention, and FIG. 1 (d) shows the sealing material of FIG. 1 (c) fitted into the seal groove of FIG. FIG.

  A seal material 2 in FIG. 2C is a seal material made of an elastic body such as rubber fitted in the seal groove 1 in FIG. 1A, and has a circular portion corresponding to the cross-sectional shape of the back 1B of the seal groove 1. 2B and a protruding portion 2A protruding from the circular portion 2B. Then, by a press-fitting method in which the circular portion 2B of the seal material 2 is pushed into the back 1B from the inlet 1A of the seal groove 1, the seal material 2 is fitted into the seal groove 1 as shown in FIG. Only the tip of the protruding portion 2A is arranged so as to protrude outward from the seal groove inlet 1A.

  FIG. 3 is a perspective view of a gate valve (open state) to which the seal groove of FIG. 1A and the seal material of FIG. 1C are applied.

  The gate valve GV in FIG. 1 includes a receiving member 5 having a receiving surface 4, a pressing member 7 having a pressing surface 6 facing the receiving surface 4, a gate 8 having one end opened on the receiving surface 4, and the receiving surface 4 And a sealing material 2 interposed between the pressing surface 6 and sealing a gap around the opening end of the gate 8 on the receiving surface 4 side.

  The sealing material 2 is composed of the sealing material 2 of FIG. 1C and is attached to the pressing surface 6 of the pressing member 7. Further, the pressing surface 6 and the receiving surface 4 are both flat surfaces 4A, 6A parallel to the member surface of the sheet-like member W passed through the gate 8, and a plane inclined with respect to the member surface of the sheet-like member W. 4B and 6B, and the parallel planes 4A and 6A are opposed to each other, and the inclined planes 4B and 6B are opposed to each other. Further, the boundaries between the inclined planes 4B and 6B and the planes 4A and 6A parallel to each other are curved surfaces 4C and 6C that smoothly continue to the respective planes.

  In the gate valve GV having the above-described configuration, the seal groove 1 of FIG. 1A (the seal groove is omitted in FIG. 3) is continuously formed on the flat surfaces 6A and 6B and the curved surface 6C of the pressing surface 6 described above. The sealing material 2 of the pressing surface 6 is attached to the pressing surface 6 by being fitted into the sealing groove 1 as shown in FIG. The sealing material 2 may be attached to the receiving surface 4. In this case, the sealing grooves 1 for attaching the sealing material shown in FIG. 1A are formed on the flat surfaces 4A and 4B and the curved surface 4C of the receiving surface 4.

  3, when the pressing surface 6 is pressed against the receiving surface 4 with the sheet-like member W being passed through the gate 8, the opening end of the gate 8 on the receiving surface 4 side is blocked by the pressing surface 6. At the same time, the sealing material 2 seals the gap around the receiving surface 4 side opening end of the gate 8.

  As described above, according to the seal groove 1 having the cross-sectional shape as shown in FIG. 1A, the flat cross-sectional shape is the same on the flat surfaces 4A, 4B, 6A, 6B (S1) and the curved surfaces 4C, 6C (S2). The depth is not different between a flat surface and a curved surface as in the case of a conventional seal groove (ant groove). Therefore, the projecting height of the seal material 2 projecting from the seal groove 1 becomes uniform, and the sealing performance of the gate valve GV is improved. Improvements can be made.

DESCRIPTION OF SYMBOLS 1 Seal groove 1A Seal groove entrance 1B Seal groove depth 2 Seal material 2A Seal material protrusion 2B Seal material circular part 3 Groove cutter 3A Groove cutter blade part 4 Receiving surface 5 Receiving member 6 Pressing surface 7 Pressing member 8 Gate 30 Dovetail cutter W Sheet-like member

Claims (1)

A plane sealing groove formed for on the curved surface smoothly connected to thereto as a groove for fitting a sealing member,
The seal groove has a circular cross-sectional shape in which the vicinity of the entrance is constricted like an inverted Ω shape, and the back is wider than the constriction near the entrance ,
In the plane, the groove cutter for forming the cross-sectional shape seal groove is translated along the plane, and in the curved surface, the groove cutter is turned around a point separated from the curved surface by a predetermined distance. Thus, the sealing groove is characterized in that the cross-sectional shape of the sealing groove is the same between the flat surface and the curved surface .

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