JP6371890B2 - Branching device - Google Patents

Description

  The present invention relates to a branching device capable of controlling a fluid flowing out through a perforated portion.

  In recent years, in a branch operation of a fluid pipe, it is provided along a sealed case (case body) composed of first and second divided cases that are divided in the circumferential direction, and around a branch pipe part (branch part) of the first divided case. A rubber ring (sealing ring), and an arcuate valve body that moves between the existing pipe (fluid pipe) and the sealing case in the circumferential direction. A branching device that controls fluid flowing out from an opening (perforated part) of an existing pipe by opening and closing is widely used (for example, see Patent Document 1).

Japanese Patent No. 4631067 (page 11, FIG. 9)

  However, in the installation work of the branching device, a separate connecting pipe or the like is attached to the branching pipe part, and fluid is injected from the branching pipe part side into the closed valve body, and the connection pipe and the branching pipe part are connected. Since a pressure test, etc., is performed to confirm the connection state, not only the case where a higher fluid pressure than expected is applied to the valve body from the branch pipe part side, but also when the fluid flows backward from the branch pipe part side. The use of a valve body cannot be excluded. In such a case, in the branching device of Patent Document 1, the contact portion between the rubber ring and the valve body has high sealing performance against the fluid pressure from the existing pipe side. Although exerted, when the fluid pressure is received from the branch pipe side at the contact part between the rubber ring and the valve body by a pressure test or the like, the sealing performance deteriorates because the valve body and the rubber ring move away from each other. There is a problem.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide a branch device that can reliably maintain a sealed state against fluid pressure from the fluid pipe side and the branch portion side. To do.

In order to solve the above problems, the branching device of the present invention includes:
A case body provided on an outer peripheral surface of the fluid pipe in a state of sealingly surrounding a perforated portion of the fluid pipe, a branch portion extending from the case body and communicating with the perforated portion, and provided in the case body An annular shape comprising a substantially arc-shaped valve body movable along the outer peripheral surface of the fluid pipe, a seat portion attached to the case body so as to surround the branch port of the branch portion, and a seal portion positioned on the valve body side A branching device that controls, by the valve body, a fluid that enters and exits the case body through the branch port between the fluid pipe side and the branch part side,
The seal portion in the annular seal ring is formed with a groove portion along the annular direction, and the groove portion forms at least a sealed head portion that seals the fluid pipe side and a sealed head portion that seals the branch portion side. It is characterized in that it is formed so as to be bifurcated into contact with the valve body.
According to this feature, when the fluid pressure on the fluid pipe side is high, the valve body is pressed in the front direction of the seal portion of the seal ring, so that the fluid can be reliably sealed with the sealing head in the seal portion, When the fluid pressure on the branch portion side is high, the sealed head on the branch portion side is pressed against the valve body by the fluid pressure. Therefore, in the branch device, the sealed state can be reliably maintained against the fluid pressure from the fluid pipe side and the branch portion side.

The branching device of the present invention comprises:
The case body is provided with a support portion for movably supporting the valve body, and the valve body is provided with a stopper portion having a taper surface in the moving direction of the valve body. As the body is closed, the tapered surface is configured to gradually run on the support portion.

The branching device of the present invention comprises:
The case body is provided with a drive gear portion, and the valve body has a driven gear portion meshing with the drive gear portion formed at a position lower than an outer peripheral surface of the valve body in contact with the seal portion. It is characterized by being.

The branching device of the present invention comprises:
The annular sealing ring is configured so that, in the closed state of the valve body, the seal portion is in contact with the outer peripheral surface of the valve body in the circumferential direction, and the circumferential direction of the seal portion is in the open state of the valve body. The portion is configured to be in contact with the outer peripheral surface of the valve body.

The branching device of the present invention comprises:
A rust-proof core for rust-proofing the perforated part is attached to the perforated part of the fluid pipe, and the valve body is formed in the valve body by the rust-proof core in the closed state of the valve body. It is characterized in that the peripheral surface is pressed and pushed out to the branching portion side.

It is a top view which shows the branch apparatus in Example 1. FIG. It is a sectional side view which shows a branch device. It is a rear view which shows the inner surface of a 1st division | segmentation case. It is a principal part enlarged view of the side sectional view which shows the state by which the sealing ring was fitted by the latching groove of the 1st division | segmentation case. (A) is the front view of the partial cross section which shows a valve body, (b) is a side view similarly. It is a sectional side view which shows the state in which the valve body was accommodated in the 1st division | segmentation case. (A) is a side sectional view showing a closed state of the perforated part, (b) is a side sectional view showing an opened state of the perforated part. It is a principal part enlarged view of the sectional side view which shows the contact state of the valve body and sealing ring in the obstruction | occlusion state of a piercing | piercing part. It is front sectional drawing which shows the modification of a sealing ring.

  EMBODIMENT OF THE INVENTION The form for implementing the branch apparatus which concerns on this invention is demonstrated below based on an Example.

  The branching apparatus according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 1 and 2, the branching device 1 includes a valve body 4 formed on a substantially circular arc in a sectional view in a case body 3 that encloses a perforated portion 2 a of the fluid pipe 2 in a sealed manner. Rotate along the outer peripheral surface, open or close the branch port 3d of the branch part 3c extending from the case body 3, and control the communication state between the perforated part 2a and the branch pipe 5 connected to the branch part 3c It is a device to do.

  The fluid pipe 2 is made of, for example, ductile cast iron for waterworks buried in the ground, is formed in a substantially circular shape in cross section, and has an inner peripheral surface covered with powder coating or a mortar layer. The fluid pipe may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. Further, in this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water, for example, industrial water, agricultural water, sewage, etc., gas, gas and liquid The gas-liquid mixture may be used.

  As shown in FIG. 2, the case body 3 includes a first divided case 3 a and a second divided case 3 b, and the inner peripheral surface thereof is attached in a state of being spaced apart from the outer peripheral surface of the fluid pipe 2 by a predetermined distance. . Note that the case body 3 may have a divided structure composed of a plurality of divided case bodies of three or more, or does not have a divided structure, and is continuously formed by a mold or welding or machining. It does not matter. Furthermore, the material of the case body 3 is made of a metal material such as ductile cast iron. However, if the material is applied according to the material of the fluid pipe, it can be made of various materials like the fluid pipe described above. There may be.

  As shown in FIGS. 2 and 3, the first divided case 3a is provided with a branch portion 3c extending in a direction orthogonal to the tube axis of the fluid tube 2, and the branch tube 5 is inserted into the branch portion 3c. The seal member 9 and the detachment prevention tool 10 are connected in a sealed manner. An annular locking groove 3e provided along the outer edge of the branch port 3d of the branch portion 3c is formed on the inner peripheral surface of the first split case 3a. The locking groove 3e is formed along the curved surface shape of the inner peripheral surface of the branching portion 3c so that the opening faces the fluid pipe 2 side, and protrudes toward the opening on the bottom surface portion. The protruding ridges 3f are formed along the circumferential direction.

  Further, a through portion 3g that penetrates the tube wall of the first divided case 3a is provided between the locking groove 3e and the branch port 3d, and a drive gear unit 6 is provided in the through portion 3g. The drive gear unit 6 is provided at a lid member 61 that covers the penetrating portion 3g in a sealing manner, a rotary shaft 62 that is rotatably attached to the lid member 61, and an end of the rotary shaft 62 on the case body 3 side. And a worm wheel 64 (drive gear portion) that is rotatably mounted via a fixture fixed to the lid member 61 and meshes with the worm gear 63, and the worm gear on the rotating shaft 62. The worm wheel 64 can be rotated by operating the end on the side facing 63 from the outside of the first divided case 3a.

  As shown in FIG. 3, support portions 3 h that support the valve body 4 so as to be movable in the circumferential direction are provided at both ends in the tube axis direction of the fluid tube 2 in the first divided case 3 a. The support portion 3h has a shape along the circumferential direction of the fluid pipe 2, and protrudes in the radial direction of the branch port 3d. As shown in FIG. 6, the lower surface of the valve body 4 is the support portion. It can move in the circumferential direction while sliding for 3 h. In the present embodiment, the support part 3h is not formed in the second split case 3b, but the support part 3h is similarly formed in the second split case 3b, and the valve body 4 reaches the second split case 3b. It may be movable.

  As shown in FIG. 4, a sealing ring 7 made of an elastic body is fitted and installed in the locking groove 3e. A rubber adhesive may be interposed between the locking groove 3e and the sealing ring 7 for reinforcement. The seal ring 7 is provided at the boundary between the seat portion 7a attached to the locking groove 3e, the seal portion 7b capable of contacting the valve body 4, and the seat portion 7a and the seal portion 7b on both side surfaces of the seal ring 7. It is mainly comprised from the notch grooves 7c and 7c. Concave portions 7d that are continuous along the circumferential direction are formed on the bottom surface of the seat portion 7a, and the bottom surface portions 7j and 7k on both sides of the concave portion 7d can be deformed. Further, the sealing ring 7 is installed in the locking groove 3e in a state in which the concave portion 7d is closely fitted to the convex strip 3f.

  The seal portion 7b is a portion projecting into the case body 3 from the opening of the locking groove 3e. The seal portion 7b is formed with a groove portion 7e along the circumferential direction, and a fluid sandwiching the groove portion 7e. Sealed heads 7f and 7g are provided on the tube 2 side and the branching portion 3c side so as to be bifurcated. The sealed head portions 7f and 7g are formed in a shape having a curved tip portion, and can be independently deformed independently from the notch grooves 7c and 7c. As described above, the sealed heads 7f and 7g are easily deformed because their roots are thinned by the notched grooves 7c and 7c and the groove 7e.

  As shown in FIGS. 2 and 5, the valve body 4 is formed with a driven gear portion 4 a that meshes with the worm wheel 64 described above through the through portion 3 g along the outer peripheral surface. Along with the rotation, the fluid pipe 2 is rotated along the outer peripheral surface. Further, as shown in FIGS. 5 and 6, stopper portions 4 b having tapered surfaces 4 c in the direction of rotation of the valve body 4 are provided at both ends of the valve body 4 in the tube axis direction of the fluid pipe 2. The stopper portion 4b is provided so as to gradually run on the support portion 3h from the tapered surface 4c when the valve body 4 is closed (see FIGS. 2 and 7A). As a result, the valve body 4 is supported so as to be pushed out toward the branch portion 3c, and the outer peripheral surface of the valve body 4 gradually crushes the sealing heads 7f and 7g away from each other and flows out through the perforated portion 2a. The fluid is surely prevented from leaking into the branch pipe 5. The stopper portion 4b is not necessarily provided.

  As shown in FIG. 7A, in the closed state of the valve body 4, the inner peripheral surface of the valve body 4 is pressed by the rust-proof core 8 attached to rust the perforated portion 2a. It is supported so that the valve body 4 may be further pushed out to the branch part 3c side. Thereby, the outer peripheral surface of the valve body 4 further crushes the sealed heads 7f and 7g so as to be separated from each other. Further, as shown in FIG. 7B, in the opened state of the valve body 4, the perforated part 2a and the branch pipe 5 are in a communication state. For example, in a fluid pipe whose outer peripheral surface is subjected to zinc spraying, the effect of the sacrificial anode is great. Therefore, the rust prevention core 8 is unnecessary and may not be provided.

  Furthermore, since the sealing heads 7f and 7g are formed in a curved shape, the contact area with the valve body 4 is reduced, and the frictional force can be suppressed. Therefore, it is possible to prevent the sealing heads 7f and 7g from being deformed by sliding with the valve body 4, for example, and the valve body 4 can be easily operated.

  Further, the curved shapes of the sealing heads 7f and 7g can prevent the sealing heads 7f and 7g from interfering with the driven gear portion 4a of the valve body 4, and the sealing ring 7 from falling off the locking groove 3e.

  By the way, in the closed state of the valve body 4, it is higher than the fluid pressure on the fluid pipe 2 side with respect to the valve body 4 due to a pressure test for injecting fluid from the branch pipe 5 side, a back flow of the fluid flowing through the branch pipe 5, etc. It is assumed that pressure is applied. In that case, as shown by the arrow in FIG. 8, a force is applied to the valve body 4 by the fluid pressure from the branch portion 3 c side, and the sealing ring 7 on the branch pipe 5 side is applied. A force to move to the fluid pipe 2 side works. That is, the valve body 4 and the sealing ring 7 are separated from each other.

  In this case, as described above, the sealing ring 7 is sealed even when the valve body 4 is slightly pushed up by the sealing head 7g being pressed against the valve body 4 by the fluid pressure from the branch pipe 5 side. The head 7g follows the valve body 4 and can maintain a sealed state. Furthermore, since the sealing head 7g is easily deformed from its root, the sealing head 7g is easily pressed against the valve body by the fluid pressure from the branch pipe 5 side, and the sealing ability of the sealing head 7g is improved. high.

  Further, for example, even if a gap is formed between the sealing head 7g and the locking groove 3e due to the sealing head 7g following the valve body 4, the recesses 7d of the sealing ring 7 and the protrusions of the locking groove 3e are formed. Since the projections and recesses 3f are concavo-convexly fitted, it is possible to prevent the fluid on the branching portion 3c side from flowing out to the opposite side even if the fluid flows around through the gap.

  Further, when a force that moves the sealing ring 7 to the fluid pipe 2 side is exerted by the fluid pressure from the branch portion 3c side, the movement of the sealing ring 7 on the sealing head 7g side is stopped by the ridge 3f, and the fluid The sealed head 7f on the tube 2 side is not affected, and the sealed state on the fluid tube 2 side can be maintained. Thus, the fluid pipe 2 side and the branching part 3c side of the sealing ring 7 can be independently deformed independently from each other with the groove part 7e and the concave part 7d as the starting point, and the fluid pressure can be applied from either the fluid pipe 2 side or the branching part 3c side. Will not affect each other.

  There are the following modified examples of the sealing ring. As shown in FIG. 9, the sealing ring 71 includes a sealing head 71 f having a substantially rectangular shape in cross section in which the seal portion 71 b is disposed on the fluid pipe 2 side of the groove portion 71 e, and the sealing head 71 f side The side surface of this is a flat surface. Therefore, the sealed head 71f is not easily deformed. Further, a sealing head 7g is disposed on the branching part 3c side of the groove 71e. Thus, the fluid pipe 2 side of the sealing ring 71 may be formed in the shape of a conventional sealing ring so that the sealing head 7g can be sealed against the fluid pressure from the branching portion 3c side. Thus, the seal part 71b does not need to be formed symmetrically on both sides of the groove part 71e.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, after attaching the case body 3 to the fluid pipe 2, a predetermined punching device may be connected to the branching portion 3c to form the punching portion 2a in an uninterrupted state.

  Further, the recess 7d is provided on the bottom surface of the seat portion 7a with a plurality of two or more strips to form a region where the wraparound fluid can stay between the sealing ring 7 and the locking groove 3e so that the fluid does not flow out to the opposite side. It may be.

  Further, a plurality of groove portions 7e may be provided in the seal portion 7b to form three or more sealed head portions.

DESCRIPTION OF SYMBOLS 1 Branching device 2 Fluid pipe 2a Perforation part 3 Case body 3a 1st division | segmentation case 3b 2nd division | segmentation case 3c Branching part 3d Branching port 3e Locking groove 3f Projection 4 Valve body 4a Follower gear part 4b Stopper part 4c Tapered surface 5 Branching Tube 6 Drive gear unit 7 Seal ring 7a Seat portion 7b Seal portion 7c, 7c Notch groove 7d Recess 7e Groove portions 7f, 7g Sealed head portions 7j, 7k Bottom surface portion 64 Worm wheel (drive gear portion)
71 Seal ring 71b Seal portion 71e Groove portion

Claims (5)

A case body provided on an outer peripheral surface of the fluid pipe in a state of sealingly surrounding a perforated portion of the fluid pipe, a branch portion extending from the case body and communicating with the perforated portion, and provided in the case body An annular shape comprising a substantially arc-shaped valve body movable along the outer peripheral surface of the fluid pipe, a seat portion attached to the case body so as to surround the branch port of the branch portion, and a seal portion positioned on the valve body side A branching device that controls, by the valve body, a fluid that enters and exits the case body through the branch port between the fluid pipe side and the branch part side,
The seal portion in the annular seal ring is formed with a groove portion along the annular direction, and the groove portion forms at least a sealed head portion that seals the fluid pipe side and a sealed head portion that seals the branch portion side. The branching device is formed so as to be bifurcated into contact with the valve body.   The case body is provided with a support portion for movably supporting the valve body, and the valve body is provided with a stopper portion having a taper surface in the moving direction of the valve body. The branching device according to claim 1, wherein the tapered surface gradually climbs onto the support portion as the body is closed.   The case body is provided with a drive gear portion, and the valve body has a driven gear portion meshing with the drive gear portion formed at a position lower than an outer peripheral surface of the valve body in contact with the seal portion. The branching device according to claim 1, wherein the branching device is provided.   The annular sealing ring is configured so that, in the closed state of the valve body, the seal portion is in contact with the outer peripheral surface of the valve body in the circumferential direction, and the circumferential direction of the seal portion is in the open state of the valve body. The branching device according to claim 3, wherein the portion is configured to contact an outer peripheral surface of the valve body.   A rust-proof core for rust-proofing the perforated part is attached to the perforated part of the fluid pipe, and the valve body is formed in the valve body by the rust-proof core in the closed state of the valve body. The branching device according to any one of claims 1 to 4, wherein the branching device is configured such that a peripheral surface is pressed and pushed toward the branching portion side.

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