Fixing structure of anticorrosive core in snap tap

Abstract

To provide a snap tap which can fix an anticorrosive core to a predetermined position of a water flow hole of a water main pipe easily and securely.SOLUTION: A fixing structure of an anticorrosive core in a snap tap includes: a snap tap 1 having an inflow pipe 101 connected to a water flow hole h made in a water main pipe P1; an attachment member 2 which attaches the snap tap 1 to the water main pipe P1; and an anticorrosive core 3 inserted into the water flow hole h of the water main pipe P1. In the snap tap 1, a plurality of annular groove parts 106 are formed along an axial direction on an inner peripheral surface of the inflow pipe 101. In the anticorrosive core 3, an annular flange part 323 is formed on an outer peripheral surface. When the anticorrosive core 3 is inserted into the water flow hole h of the water main pipe P1 through the inflow pipe 101 of the snap tap 1, the flange part 323 of the anticorrosive core 3 is engaged with any of the groove parts 106 of the inflow pipe 101 in a fitting manner.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a fixing structure for a corrosion-resistant core in a water distribution valve that is attached to a water main and distributes water flowing through the water main to a water branch pipe. [Background technology]

[0002] Conventionally, a diverter valve has been used to distribute water flowing through a water main pipe to a water branch pipe. This diverter valve includes a diverter valve having an inlet pipe connected to a water passage hole formed in the water main pipe, a mounting member for mounting the diverter valve to the water main pipe, and a corrosion-resistant core inserted into the water passage hole of the water main pipe (see, for example, Patent Documents 1 to 3).

[0003] This corrosion-resistant core 3 is inserted by being pushed into a predetermined position where the step 313a on the peripheral surface abuts the peripheral edge of the water hole h of the water main pipe P1, for example as shown in Figure 6. However, in order to prevent any inadvertent movement in the axial direction thereafter, a flange 323 at the upper end is known to engage with a groove 106' on the inner peripheral surface of the inlet pipe 101 of the water distribution valve 1 and fixed in place.

[0004] When the water distribution tap 1 is attached to the water main P1 via the mounting member 2, the degree of shrinkage of the gasket 23 varies depending on whether the bolt 24a of the mounting member 2 is tightened or loosened, and as a result, the axial position of the groove 106' of the inlet pipe 101 also varies. Therefore, the groove 106' of the inlet pipe 101 is formed long in the axial direction so that the flange 323 of the corrosion-resistant core 3 fits securely into the groove 106' of the inlet pipe 101. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-46564 A [Patent Document 2] JP 2014-081003 A [Patent Document 3] JP 2008-144957 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the groove portion 106' of the inlet pipe 101 is formed long in the axial direction in this manner, play occurs between the flange portion 323 of the corrosion-resistant core 3 and the groove portion 106' of the inlet pipe 101, and as a result, after the corrosion-resistant core 3 is inserted into a predetermined position in the water passage h of the water main pipe P1, it may move in the opposite direction of the water passage h, causing it to not protrude sufficiently into the inside of the water main pipe P1, or it may move in the direction of the water passage h, causing it to protrude too much into the inside of the water main pipe P1, resulting in the problem that the corrosion-resistant core 3 may not be securely fixed in the predetermined position in the water passage h of the water main pipe P1.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a fixing structure for a corrosion-resistant core in a water distribution valve that can easily and reliably fix the corrosion-resistant core at a predetermined position in the water passage hole of a water main pipe. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a fixing structure for a corrosion-resistant core in a branch tap, comprising a branch tap having an inlet pipe connected to a water passage drilled in a water main pipe, and a corrosion-resistant core inserted into the water passage of the water main pipe, wherein the branch tap has a plurality of grooves formed along the axial direction on the inner surface of the inlet pipe, and the corrosion-resistant core has a flange formed on the outer surface, and when the corrosion-resistant core is inserted into the water passage of the water main pipe through the inlet pipe of the branch tap, the flange of the corrosion-resistant core engages with any of the grooves on the inner surface of the inlet pipe.

[0009] According to this, when the corrosion protection core is inserted into the water passage of the main water pipe, the flange of the corrosion protection core engages so as to fit into one of the grooves of the diverter valve, thereby preventing the corrosion protection core from moving axially relative to the water passage and enabling the corrosion protection core to be securely fixed in the appropriate position in the water passage.

[0010] The grooves may be formed in a row along the axial direction within a range of 2 to 30 mm from the tip surface of the inflow pipe of the distributor valve. With this, even if the axial position of the groove of the inflow pipe fluctuates as the degree of contraction of the gasket fluctuates in response to tightening or loosening of the bolts of the mounting member in a general distributor valve, the flange of the corrosion protection core can be engaged so as to fit more securely into any one of the grooves of the inflow pipe.

[0011] The groove may be formed in a ring shape extending in the circumferential direction, whereby the flange of the corrosion protection core can be securely engaged with the groove of the inlet pipe. Effect of the Invention

[0012] According to the present invention, when the corrosion protection core is inserted into the water passage of the main water pipe, the flange portion of the corrosion protection core engages so as to fit into one of the grooves of the diverter valve, thereby preventing the corrosion protection core from moving axially relative to the water passage and enabling the corrosion protection core to be securely fixed in the appropriate position in the water passage. [Brief description of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view showing the overall configuration of a water distributor unit according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a fixing structure of a corrosion protection core in the diverter valve of FIG. 1. [Diagram 3] FIG. 3 is a perspective view showing the corrosion protection core of FIG. 2. [Figure 4] 3 is an enlarged cross-sectional view showing a groove portion of an inlet pipe of the diverter valve of FIG. 2. [Diagram 5] A diagram showing the process of inserting a corrosion protection core into a water main pipe water passage hole. [Figure 6] FIG. 11 is a cross-sectional view showing a fixing structure of a corrosion-resistant core in a conventional water diverter valve. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Next, an embodiment of a water distribution valve unit according to the present invention will be described with reference to Figs. 1 to 6.

[0015] As shown in Figure 1, this water distribution tap unit comprises a water distribution tap 1 for distributing water flowing through a water main pipe P1 to a water branch pipe P2, a mounting member 2 for mounting the water distribution tap 1 to the water main pipe P1, and a corrosion-resistant core 3 to be inserted into a water hole h drilled in the water main pipe P1.

[0016] 1, the diverter valve 1 includes a diverter valve body 10 that is attached between a water main pipe P1 and a water branch pipe P2, a ball valve body 11 that is housed inside the diverter valve body 10, and a plug rod 12 for rotating the ball valve body 11 about a predetermined rotation axis. In this embodiment, the rotation axis K extends horizontally along the central axis of the plug rod 12.

[0017] The water distribution valve body 10 has an overall shape that is approximately cross-shaped, and is equipped with an inlet pipe 101 provided at the lower part in the vertical direction, an outlet pipe 102 provided at the front part in the horizontal direction, an insertion pipe 103 provided at the upper part in the vertical direction, and an operating pipe 104 provided at the rear part in the horizontal direction.

[0018] The inlet pipe 101 is formed in a cylindrical shape extending downward perpendicular to the rotation axis K, and its tip opening is connected to a water main pipe P1 so that water flowing through the water main pipe P1 flows into it.

[0019] Furthermore, the inflow pipe 101 has a plurality of (four in this embodiment) annular grooves 106 formed along the axial direction on the inner circumferential surface of the tip on the water main side. These grooves 106 are for fitting and engaging with a flange 323 of the corrosion protection core 3, which will be described later, when the corrosion protection core 3 is inserted into the water passage hole h of the water main pipe P1, as will be described later.

[0020] In this embodiment, the grooves 106 of the corrosion protection core 3 have an axial width A of 0.5 to 5 mm and a radial depth B of 0.1 to 3 mm of the inlet pipe 101 of the diverter tap 1, and are arranged in a line along the axial direction at intervals D of 0.5 to 8 mm (fixed intervals in this embodiment) within a range of 2 to 30 mm from the tip face 101a of the inlet pipe 101 of the diverter tap 1, as shown in Fig. 4. With this, in a general diverter tap 1, even if the axial position of the grooves 106 of the inlet pipe 101 fluctuates as the degree of contraction of the gasket 23 fluctuates in response to tightening or loosening of the bolts 24a of the mounting member 2, the flange 323 of the corrosion protection core 3 can be engaged so as to fit more securely into any of the grooves 106 of the inlet pipe 101.

[0021] The outflow pipe 102 is formed in a cylindrical shape extending forward along the rotation axis K, and its tip opening is connected to the water branch pipe P2, so that water flowing from the inflow pipe 101 through the ball valve body 11 is discharged into the water branch pipe P2.

[0022] The insertion tube 103 is formed in a cylindrical shape extending upward perpendicular to the rotation axis K, and under normal circumstances the tip opening is closed by a cap member 105, whereas when the water distribution valve 11 is installed, the cap member 105 is removed and a cutting tool or an insertion tool M is inserted.

[0023] The operating pipe 104 is formed in a cylindrical shape extending rearward along the rotation axis K, and the plug rod 12 is inserted therethrough. The plug rod 12 includes a shaft portion 121 inserted inside the operating pipe 104, an operating portion 122 exposed from the tip opening of the operating pipe 104, and a nut portion 123 provided in a manner that covers the tip opening of the operating pipe 104, and the tip portion of the shaft portion 121 is connected to the rear center of the ball valve body 11. As a result, when the plug rod 12 is rotated axially while holding the operating portion 122 with a predetermined tool, the ball valve body 11 rotates axially around the rotation axis K inside the water distribution valve body 10.

[0024] The ball valve body 11 is a metallic sphere that is rotatably supported inside the water distribution valve body 10 in a manner that it is sandwiched from above and below by upper and lower annular ball seats 114 .

[0025] As shown in FIG. 1, the ball valve body 11 has an inlet 111 formed at the lower part in the vertical direction, an outlet 112 formed at the front part in the horizontal direction, and an insertion port 113 formed at the upper part in the vertical direction, and the inside of the ball valve body 11 is penetrated in a manner that communicates with the inlet 111, the outlet 112, and the insertion port 113.

[0026] When the ball valve body 11 is accommodated in the diversion valve body 10, the ball valve body 11 is rotated about its axis by a predetermined angle (90 degrees in this embodiment) by the plug rod 12, so that the inlet 111 is positioned so that it opens toward the inlet pipe 101 when the valve is opened, and so that it opens toward the side of the diversion valve body 10 when the valve is closed.

[0027] When the ball valve body 11 is accommodated in the water distribution valve body 10, the outlet 112 is positioned so that it opens toward the outlet pipe 102 both when the valve is opened and when it is closed, by the ball valve body 11 being rotated axially at a predetermined angle (90 degrees in this embodiment) by the valve rod 12.

[0028] When the ball valve body 11 is accommodated in the diversion valve main body 10, the insertion port 113 is positioned so that it opens toward the insertion pipe 103 when the valve is opened, and so that it opens toward the side of the diversion valve main body 10 when the valve is closed.

[0029] When the water distribution valve 11 is opened, the ball valve body 11 is rotated about its axis by the tap rod 12, so that the outlet port 112 of the ball valve body 11 is positioned so as to open toward the outflow pipe 102, while the inflow port 111 and the insertion port 113 of the ball valve body 11 are positioned so as to open toward the inflow pipe 101 and the insertion pipe 103, respectively.This brings the insertion pipe 103 and the inflow pipe 101 into a linear communication state through the inside of the ball valve body 11, and the inflow pipe 101 and the outflow pipe 102 into a communication state while bending via the ball valve body 11.

[0030] On the other hand, when closing the water distribution valve 1, the ball valve body 11 is rotated around its axis by the plug rod 12, so that the outlet port 112 of the ball valve body 11 is positioned so as to open toward the outlet pipe 102, while the inlet port 111 and insertion port 113 of the ball valve body 11 are positioned so as to open toward the side of the ball valve body 11, and the inlet pipe 101 and outlet pipe 102 of the water distribution valve 1 are closed by the ball valve body 11.

[0031] The mounting member 2 comprises a saddle 21 to which the water distribution tap 1 is connected and which is fixed to the upper outer peripheral surface of the water main pipe P1, a band 22 which is arranged opposite the saddle 21 across the water main pipe P1 and which is fixed to the lower outer peripheral surface of the water main pipe P1, a gasket 23 which is provided between the saddle 21 and the water main pipe P1, and a fastener 24 consisting of a bolt 24a and a nut 24b which connects and fixes the saddle 21 and band 22 to the water main body.

[0032] Thus, the worker can attach the saddle 21 to which the distribution valve 1 is attached to the upper outer circumferential surface of the water main P1 and the band 22 to the lower outer circumferential surface of the water main P1, and then tighten the saddle 21 and band 22 with the fasteners 24 consisting of bolts 24a and nuts 24b on both sides of the saddle 21 and band 22, thereby attaching the distribution valve 1 to the water main P1. Note that since the degree of contraction of the gasket 23 varies depending on the tightening or loosening of the bolts 24a of the mounting member 2, the position of the inlet pipe 101 of the water main P1 relative to the water main P1 varies slightly in the axial direction.

[0033] As shown in Figures 2 and 3, the corrosion-resistant core 3 is a tubular member provided for corrosion protection of the water passage h of the water main P1, and comprises an outer core portion 31 that fits tightly into the water passage h, and an inner core portion 32 that fits tightly inside the outer core portion 31.

[0034] The outer core portion 31 is a cylindrical member made of metal or resin, and comprises an upper cylindrical portion 311 having a large outer diameter and inner diameter, and a lower cylindrical portion 312 having a small outer diameter and inner diameter, and the upper cylindrical portion 311 and the lower cylindrical portion 312 are integrally formed along the axial direction.

[0035] Further, the outer core portion 31 is provided with a rubber member 313 on the outer peripheral surfaces of the upper cylindrical portion 311 and the lower cylindrical portion 312. The rubber member 313 is formed in a shape corresponding to the upper cylindrical portion 311 and the lower cylindrical portion 312 of the outer core portion 31, and a step portion 313a is formed at the boundary portion between the upper cylindrical portion 311 and the lower cylindrical portion 312. As a result, when the corrosion protection core 3 is inserted into the water passage hole h of the water main pipe P1, the rubber member 313 expands by contacting with water, and the step portion 313a of the rubber member 313 abuts on the peripheral portion of the water passage hole h of the water main pipe P1, and the rubber member 313 is fitted into the water passage hole h in a manner that the rubber member 313 is pressed radially inward from the peripheral portion of the water passage hole h of the water main pipe P1.

[0036] The inner core portion 32 is a cylindrical member made of metal or resin, and comprises an upper cylindrical portion 321 having a large outer diameter and a lower cylindrical portion 322 having a small outer diameter, the upper cylindrical portion 321 and the lower cylindrical portion 322 being integrally formed along the axial direction, and the upper cylindrical portion 321 and the lower cylindrical portion 322 being formed on a continuous inner circumferential surface along the axial direction.

[0037] The inner core portion 32 has an annular flange 323 extending radially outwardly formed along the circumferential direction on the outer circumferential surface of the upper end portion of the upper cylindrical portion 321. This flange 323 protrudes radially outwardly from the outer core portion 31 (including the rubber member 313) so as to correspond to the width, depth and diameter of the groove 106 of the inlet pipe 101 of the diverter valve 1, and engages with one of the grooves 106 of the inlet pipe 101 of the diverter valve 1 when the corrosion-resistant core 3 is inserted into the water passage h of the water main pipe P1.

[0038] Moreover, the inner core portion 32 has a plurality of axially extending notches 323a formed along the circumferential direction in the flange portion 323 of the upper cylindrical portion 321. Therefore, when the corrosion protection core 3 is passed through the inlet pipe 101 of the diverter faucet 1, the flange portion 323 is easily bent radially inward as it is pressed against the inner circumferential surface of the inlet pipe 101, so that the corrosion protection core 3 can be smoothly moved to the water passage hole h of the water main pipe P1. Furthermore, when the corrosion protection core 3 is inserted into the water passage hole h of the water main pipe P1, the flange portion 323 of the corrosion protection core 3 is easily engaged so as to fit into the groove portion 106 of the inlet pipe 101 while returning radially outward, so that the corrosion protection core 3 can be reliably fixed to the water passage hole h of the water main pipe P1.

[0039] Furthermore, the inner core portion 32 has a plurality of axially extending notches 324a formed along the circumferential direction at the lower end of the lower cylindrical portion 322. Therefore, when the corrosion protection core 3 is inserted into the water passage h of the water main pipe P1, the protrusions 324 bend radially inward as they are pressed by the inner surface of the water passage h of the water main pipe P1, and then tend to return to their radially outward positions when passing through the water passage h of the water main pipe P1, so that the corrosion protection core 3 can be smoothly inserted into the water passage h of the water main pipe P1 and reliably fixed thereto.

[0040] Next, a method for inserting and fixing the corrosion protection core 3 into the water passage hole h of the water main pipe P1 through the inlet pipe 101 of the diverter tap 1 will be described with reference to Fig. 5. In Fig. 5, the diverter tap 1 is attached to the water main pipe P1 via the mounting member 2, and the water main pipe P1 has a water passage hole h drilled through the inlet pipe 101 of the diverter tap 1.

[0041] First, as shown in Fig. 5(a), the ball valve body 11 of the diverter tap 1 is placed in a closed state (the inlet 111 and the outlet 112 of the ball valve body 11 are facing the side of the diverter tap 1), and then an insertion tool M is attached to the insertion pipe 103 of the diverter tap 1. This insertion tool M comprises a fixture M1 fixed to the upper end of the inlet pipe 101 of the diverter tap 1, an insertion rod M2 that is provided so as to penetrate the fixture M1 and has a corrosion protection core 3 attached to its lower end, and a handle portion M3 provided at the upper end of the insertion rod M2, and the insertion rod M2 advances or retreats in the vertical direction when the operator pushes in or pulls out the handle portion M3.

[0042] Then, as shown in Figure 5 (b), the ball valve body 11 of the diversion valve 1 is set in the open state (the inlet 111 and outlet 112 of the ball valve body 11 are facing vertically), and the handle portion M3 is pushed in to insert the insertion rod M2 downward into the inside of the diversion valve 1. As a result, the corrosion protection core 3 at the tip of the insertion rod M2 also passes through the ball valve body 11 and moves downward through the inlet pipe 101 of the diversion valve 1, and is inserted into the water passage h of the main water pipe P1 until it is pushed into a predetermined position where the step portion 313a abuts the peripheral portion of the water passage h of the main water pipe P1. At this time, the corrosion-resistant core 3 expands when the rubber member 313 comes into contact with water, and is pressed radially inward from the peripheral edge of the water passage h of the water main pipe P1 of the outer core portion 31, and the flange portion 323 of the inner core portion 32 engages with one of the groove portions 106 of the inlet pipe 101 (in this embodiment, the second groove portion 106 from the top).Therefore, the corrosion-resistant core 3 can be prevented from moving axially relative to the water passage h, and the corrosion-resistant core 3 can be securely fixed in a predetermined position in the water passage h.

[0043] Then, as shown in FIG. 5(c), the handle portion M3 is pulled out to move the insertion rod M2 upward inside the faucet 1, and the tip of the insertion rod M2 is returned to its original position in the fixture M1.

[0044] All that remains to be done is to return the ball valve body 11 of the diverter tap 1 to the closed state again (with the inlet 111 and outlet 112 of the ball valve body 11 facing the side of the diverter tap 1), remove the insertion tool M from the insertion tube 103 of the diverter tap 1, and then close the upper end of the insertion tube 103 with the cap member 105, completing the installation of the corrosion protection core 3.

[0045] In this embodiment, each groove portion 106 of the inlet pipe 101 of the water distribution valve 1 and the flange portion 323 of the corrosion-resistant core 3 are each formed in a ring shape, but they may be formed in a shape other than a ring as long as they engage with each other to fit together.

[0046] In addition, although the flange portion 323 of the corrosion protection core 3 is formed on the outer peripheral surface of the upper end portion of the corrosion protection core 3, the flange portion 323 may be formed at another position on the outer peripheral surface of the corrosion protection core 3 as long as it is positioned outside the water main P1 when inserted into the water passage h of the water main P1.

[0047] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0048] 1...Diverter valve 10…Water distribution valve body 101...Inflow pipe 102...Outflow pipe 103...insertion tube 104...Operation tube 105...Cap member 106…Groove 11...Ball valve body 111...Inlet 112... Outlet 113…insertion slot 114...Ball seat 12...stopper rod 121...Shaft 122...Operation unit 123…Nut part 2...Mounting material 21…Saddle 22...Band 23…Gasket 24... Fastener 24a…Bolt 24b...Nut 3…Corrosion-resistant core 31…Outer core part 311...Upper cylindrical part 312…Lower cylindrical part 313...Rubber parts 313...Double part 32…Inner core part 321...Upper cylindrical part 322…Lower cylindrical part 323…Flange 323a…Notch 324…Protrusion 324a…Notch P1…Water main P2…Water branch pipe h…Water hole M…Insertion tool M1…Fixing tool M2…insertion rod M3…Handle section

Claims

1. A water distribution valve having an inlet pipe connected to a water passage hole drilled in a water main pipe, and a corrosion protection core inserted into the water passage hole of the water main pipe, The water distribution valve has a plurality of grooves formed on the inner peripheral surface of the inlet pipe along the axial direction, The corrosion protection core has a flange formed on its outer circumferential surface, A fixing structure for a corrosion-resistant core in a water distribution valve, characterized in that when the corrosion-resistant core is inserted into the water passage of the water main pipe through the inlet pipe of the water distribution valve, the flange portion of the corrosion-resistant core engages with any groove portion on the inner surface of the inlet pipe.

2. The fixing structure of a corrosion-resistant core in a water distribution valve as described in claim 1, wherein the grooves are formed in a row along the axial direction within a range of 2 to 30 mm from the tip surface of the inlet pipe of the water distribution valve.

3. The fixing structure of a corrosion-resistant core in a water distributor according to claim 1 or 2, wherein the groove portion is formed in an annular shape extending in a circumferential direction.

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