JP2014037846A - Removal preventing structure of seal member from connection pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removal preventing structure of an O ring from a connection pipe, which prevents the O ring attached to the connection pipe from being removed with an easy structure and eliminates the need for performing groove processing etc. for preventing the removal of the O ring to the connection pipe, at low cost.SOLUTION: A removal preventing member 104 including a press-fit part 106 which is press-fitted into a connection pipe 52 and a wall part 108 erected to the radially outward side relative to an outer peripheral surface of the press-fit part 106 is attached to the connection part 52 by press-fitting the press-fit part 106 into the connection pipe 52 from one axial end. The wall part 108 is protruded to the radially outward side relative to an outer peripheral surface of the connection pipe 52 at the axial outer side of the connection pipe 52 to cause the wall part 108 to face the O ring 112 in an axial direction. Stopper action of the wall part 108 prevents the O ring 112 from being removed from the connection pipe 52.

Description

  The present invention relates to a structure for preventing a sealing member from being removed from a connecting pipe, and more specifically, to prevent a sealing member that seals between the connecting pipes from the connecting pipe in a state where the end of the connecting pipe is inserted and connected to the connecting hole of the mating member. Concerning structure.

Conventionally, when connecting the end of the connection pipe through which the fluid flows inside the pipe into the connection hole of the mating member, a ring-shaped sealing member such as an O-ring is attached in advance to the outer peripheral surface of the end of the connection pipe. Therefore, it is widely performed to seal between the end of the connecting pipe and the mating member by the seal member.
As a structure for preventing the sealing member from being removed by the connecting pipe at that time, a holding groove having a shape recessed radially inward from the outer peripheral surface is provided on the outer peripheral surface of the end portion of the connecting pipe over the entire circumference, and the sealing member is provided there. In general, a structure is used in which the sealing member is prevented from being pulled out by fitting and holding.
For example, the following Patent Document 1 discloses a structure for preventing a seal member of this type.

However, if the holding pipe is directly provided in the connecting pipe and the sealing member is fitted and held in the connecting pipe to prevent it from being removed, for example, when the connecting pipe is a metal pipe, the holding groove is processed. In general, there is a problem that it is difficult or the cost for processing becomes high.
Furthermore, in order to process and form such a holding groove in the metal tube, it is necessary to increase the thickness of the metal tube, which increases the weight of the connection tube.
On the other hand, when the connecting pipe is formed of a resin pipe, it is possible to mold the holding groove at the same time as the resin pipe is molded, but in this case, the mold structure becomes complicated due to the molding of the holding groove. , Mold cost will be high.

As another means, the following Patent Document 2 discloses a device for a “guide movable pipe seal structure”, in which guide rings (2) and (3) are provided on the outer peripheral surface of the end of the pipe (1). An annular concave space is formed between them, an O-ring (seal member) (4) is attached thereto, the tip of the pipe (1) is expanded, and the guide ring (3) is removed. It is disclosed that the O-ring (4) is prevented from coming off through the guide ring (3) by being stopped.
In the one disclosed in Patent Document 2, although it is not necessary to directly form the holding groove for the seal member in the connecting pipe, the end portion of the connecting pipe must be expanded and processed on the connecting pipe. Is still necessary.

JP 2011-89289 A No. 1-444877

  The present invention is based on the above circumstances, the sealing member attached to the connecting pipe can be secured with a simple structure, and the connecting pipe itself does not require groove processing for retaining the sealing member. The object of the present invention is to provide a structure for preventing a sealing member from being removed from a pipe at a low cost.

  Thus, according to the first aspect of the present invention, the connection pipe in which the fluid flows inside the pipe is attached to the outer peripheral surface of the end portion inserted and connected to the connection hole of the mating member, and between the end portion and the mating member. A ring-shaped sealing member that seals from the connecting pipe, and a sealing member retaining structure from the connecting pipe, the press-fitting part that is press-fitted into the connecting pipe, and an outer peripheral surface of the press-fitting part A retaining member having a wall portion rising radially outward is press-fitted into the connecting pipe from one end in the axial direction and attached to the connecting pipe, and the wall portion is connected to the shaft of the connecting pipe. The wall portion is protruded radially outward from the outer peripheral surface of the connection pipe on the outer peripheral surface of the connecting pipe, and the wall portion is opposed to the seal member in the axial direction. The seal member is prevented from being pulled out by the stopper action of the above.

  According to a second aspect of the present invention, in the first aspect, the retaining member protrudes outward in the radial direction at a position spaced apart from the wall portion in the axial direction on the outer surface in the radial direction of the press-fitting portion. A plurality of portions are provided at intervals in the circumferential direction, and the protrusions are press-fitted into the connecting pipe, and the wall portions are inserted into the wall portions at the circumferential positions where the protrusions are located. A plurality of through-holes penetrating in the direction are provided corresponding to the protrusions.

Effects and effects of the invention

  As described above, according to the present invention, the ring-shaped seal member attached to the outer peripheral surface of the end portion of the connection pipe by the stopper action by the wall portion of the stoppage member is press-fitted and attached to the end portion of the connection pipe. It is designed to prevent it from being removed.

According to the present invention, the sealing member can be secured from the connecting pipe simply by press-fitting and attaching the retaining member to the connecting pipe. Therefore, according to the present invention, no matter whether the connecting pipe is a metal pipe, Even if it is a pipe, it is possible to easily realize a structure for preventing the sealing member from being removed from the connecting pipe.
In addition, since it is not necessary to directly process the sealing member on the connecting pipe itself (because it can be omitted), the retaining structure can be constructed at low cost.

In the present invention, a plurality of protrusions protruding outward in the radial direction are provided on the outer surface in the radial direction of the press-fitting portion at positions spaced apart from the wall portion in the axial direction at intervals in the circumferential direction. Can be press-fitted into the connecting pipe at the protrusions (claim 2).
By doing so, it is possible to easily press-fit the press-fitting portion into the connecting pipe, that is, to attach the retaining member by press-fitting.
Here, the press-fit portion can be configured in a cylindrical shape.

In the present invention, a plurality of through holes penetrating the wall portion in the axial direction at the circumferential position where the protrusion is located can be provided in the wall portion corresponding to the protrusion.
For example, when the retaining member is composed of a low-strength member that is softer than the connecting tube, typically, the connecting tube is composed of a metal tube, and when the retaining member is composed of a resin material, the press-fit portion is formed at a plurality of protrusions. When press-fitting into the connection pipe, the protrusion may be scraped off at the edge of the end face of the connection pipe, that is, the metal pipe.
If the protrusion is cut in this way, the shavings may come into contact with or be bitten by a sealing member such as an O-ring. In this case, the sealing member may be damaged by the shavings. There is a risk that the sealing performance may be insufficient.

Here, the second aspect is provided with a through-hole penetrating the wall portion in the axial direction at the circumferential position where the protrusion is located, and thus the protrusion is partially cut away. The shavings can be discharged to the outside of the wall part through the through hole, and the shavings can be prevented from remaining inside the wall part and damaging the seal member.
If the protrusion is formed continuously on the wall, the shavings remain attached to the wall without being well separated from the protrusion when the protrusion is shaved by the connecting pipe. There is a risk that

  Therefore, in the second aspect, the protrusion is provided at a position away from the wall in the axial direction. By doing so, when the projecting portion is shaved, the shavings can be well separated from the projecting portion, and by the separation, the shavings are smoothly discharged to the outside through the through hole of the wall portion. It becomes possible.

In this case, the protrusion is preferably a rib having a shape extending in the axial direction of the connecting pipe.
By making the protrusion into such a rib, it is possible to smoothly press-fit, and to increase the frictional force between the protrusion and the connecting pipe after press-fitting, more specifically to effectively increase the pull-out force. It becomes possible to do.
In particular, when the shape of the radially outward projecting end of the rib is reduced in diameter toward the tip in the press-fitting direction, more specifically, it is inclined so that the projecting height decreases toward the tip Thus, it is possible to obtain an advantage of easily obtaining a required pressure input, that is, a removal force while performing the press-fitting operation more smoothly.

1 is an external perspective view of a faucet device provided with a structure for preventing a sealing member from being removed from a connecting pipe according to an embodiment of the present invention. It is the top view which showed the case inside of FIG. It is the perspective view which showed the case inside of FIG. It is a perspective view of the bracket of FIG. It is the figure which showed the fixing | fixed part of the bracket and valve body of FIG. It is the figure which showed the connection part of the connection pipe and valve body of FIG. It is the figure which expanded and showed the connection part of FIG. FIG. 8 is an exploded perspective view of FIG. 7. It is the figure which showed the structure of the securing member of FIG. It is operation | movement explanatory drawing of the embodiment.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a faucet device, which has a case 12 attached to the wall W of FIG.
The case 12 has a plate-shaped upper surface portion 14, a front surface portion 15, a pair of left and right side surface portions 16, and a bottom surface portion 18. The case 12 on the side of the currant that discharges a direct water flow from the bottom surface portion 18. The water discharge port 20 and the shower-side connecting portion 22 are projected. A shower hose 24 connected to the shower head is connected to the connecting portion 22.
The rear surface of the case 12 has an open shape, and the rear surface is attached to the wall W so as to be closed by the wall W in FIG.

  Inside the case 12, as shown in FIG. 3, the shower-side valve unit 26 that performs water discharge, water stop and flow rate adjustment from the shower head side, and water discharge, water stop and flow rate adjustment from the water discharge port 20 are performed. Three valve units are arranged: a curan side valve unit 28 and a temperature control valve unit 30 that mixes water and hot water and sends mixed water to the valve units 26 and 28.

Here, the shower-side valve unit 26 is provided with a rotary flow adjustment operation unit 32 for adjusting the flow rate and a push-type water discharge operation unit 34 for water discharge and water stop.
Further, the valve unit 28 on the currant side is also provided with a rotary flow adjustment operation part 36 for adjusting the flow rate and a push-type water discharge operation part 38 for water discharge and water stop.
Further, the temperature control valve unit 30 is provided with a rotary temperature control operation unit 40 for adjusting the mixing ratio of water and hot water.

  The shower side valve unit 26, the currant side valve unit 28, and the temperature control valve unit 30 have respective operation units, specifically, a flow adjustment operation unit 32 and a discharge water operation unit 34, a flow adjustment operation unit 36 and discharge water. The operation unit 38 and the temperature adjustment operation unit 40 are accommodated inside the case 12 in a state where the operation unit 38 and the temperature adjustment operation unit 40 are exposed forward from the front surface part 15 of the case 12.

The shower-side valve unit 26, the currant-side valve unit 28, and the temperature control valve unit 30 have valve bodies 42, 44, and 46, respectively, in which valve function units are incorporated.
A water supply pipe 48 and a hot water supply pipe 50 are respectively connected to the valve body 46 of the temperature control valve unit 30.
The temperature control valve unit 30 mixes water and hot water supplied through the pipes 48 and 50 at a ratio corresponding to the operation position of the temperature control operation unit 40.

The valve body 46 in the temperature control valve unit 30, the valve body 44 of the curran side valve unit 28, and the valve body 44 and the valve body 42 of the shower side valve unit 26 are respectively connected to a connecting pipe 52 having a circular cross section. 52, the mixed water from the temperature control valve unit 30 is supplied to the valve body 44 of the valve unit 28 on the curran side through these connection pipes 52, or through the valve body 44 to the valve unit on the shower side. 26 valve bodies 42 are sent.
Here, the connecting pipe 52 is constituted by a metal pipe, specifically, a copper pipe.

As shown in FIG. 3, a pipe 54 extends from the valve body 44 of the valve unit 28 on the currant side, and a water discharge port 20 is provided at the end of the pipe 54.
A shower side pipe 56 extends from the valve body 42 of the shower side valve unit 26, and the shower hose 24 is connected to the connecting portion 22 at the tip thereof as described above.

As shown in FIG. 2, the valve bodies 42, 44, 46 are positioned by a pair of rigid brackets 58, 60, respectively, and the rigid positions protruding forward from the wall W by the bracket 60 in the determined state. It is fixed to a pair of support tools 62, 62, and is attached to the wall W via the pair of support tools 62, 62 and held.
Specifically, each of the valve bodies 42, 44, and 46 includes circular fitting portions 64, 64, and 66, and these fitting portions 64, 64, and 66 correspond to the circular shape in FIG. Are fitted in the fitting holes 68, 68, 70 respectively.

The valve body 42 in the shower side valve unit 26 is also inserted into the horizontally long rectangular opening 72 of the other bracket 58 shown in FIG. 4A, and the fixing hole 74 of the bracket 58 and FIG. Are fixed to the bracket 58 by bolts 78 and nuts 80 in a fixing hole 76 of the valve body 42 shown in FIG.
Similarly, the valve body 44 in the valve unit 28 on the curran side is also inserted into the opening 72, and in addition to the bolt 78 in the fixing hole 74 of the bracket 58 and the fixing hole 76 of the valve body 44 shown in FIG. It is fastened and fixed to the bracket 58 by a nut 80.

On the other hand, the valve body 46 in the temperature control valve unit 30 is provided with tongue-like flange portions 82 as shown in FIG. 3, and the flange portions 82 are provided with fixing holes 84. 2 and 5B, the fixing hole 84 and the fixing hole 74 of the bracket 58 are fastened and fixed to the bracket 58 by bolts 78.
The fixing hole 84 of the bowl-shaped portion 82 is a female screw hole, and a bolt 78 is screwed into the female screw hole.

The valve body 46 is also provided with a hook-like portion 93 having a triangular shape in plan view at a position away from the fixing hole 84 (a lower position in FIG. 2), and the fixing hole 92 is formed in the hook-like portion 93. (See FIG. 5C), and the fixing hole 92 and the fixing hole 94 of the bracket 60 are fastened and fixed to the bracket 60 by bolts 78.
The fixing hole 92 is also a female screw hole, and a bolt 78 is screwed into the female screw hole.

The bracket 60 shown in FIG. 4B is provided with fixing holes 88 at both left and right ends, and the bracket 60 is supported by the bolts 90 with bolts 90 in the fixing holes 88 as shown in FIG. It is fastened and fixed to the tool 62.
In this way, the bracket 60 in a state in which the valve bodies 42, 44, 46 in the shower side valve unit 26, the currant side valve unit 28, and the temperature control valve unit 30 are held in relative positions. Is attached to the wall W via the support 62 described above.

  As shown in FIG. 6, the valve bodies 42, 44, 46 are provided with cylindrical connection ports 96 for connecting the connection pipes 52 to them, and the circular connection holes 98 of these connection ports 96 are provided. The end of the connecting pipe 52 is inserted into and connected.

  In this embodiment, each valve body 42, 44, 46 is fixed in a fixed state with respect to the brackets 58, 60. Therefore, here, the connection pipe 52 from the valve body 42, 44, 46 is prevented from coming off. There is no particular structure for the connecting pipe 52, and the connecting pipe 52 is simply inserted into the valve bodies 42, 44, 46.

FIGS. 7 to 9 specifically show the structure of the connecting portion of the connecting pipe 52 to the valve bodies 42, 44, and 46 together with a structure for preventing an O-ring (seal member) 112 (described later) from the connecting pipe 52.
In the figure, reference numeral 100 denotes a flange-like portion having a circular shape when viewed in the axial direction, formed in a state of projecting radially outward at a position in the vicinity of the axial end of the connecting pipe 52 made of a metal copper pipe.
This hook-shaped portion 100 is formed by plastically deforming a part of the copper tube in the radial direction over the entire circumference with a deformation force applied to the copper tube in the axial direction. It is difficult to form the surface 100A as a surface that is perpendicular to and flat with respect to the outer peripheral surface of the connecting pipe 52. Here, a back-up ring 102 having a circular ring shape is provided at the outer side in the axial direction of the hook-shaped portion 100. It is fitted in the fitted state.
The backup ring 102 is a separate member from the connection pipe 52, and the surface 102 </ b> A on the O-ring 112 side can be easily formed on a plane that is perpendicular to the outer peripheral surface of the connection pipe 52.
Here, the backup ring 102 is made of resin.

  104 is a retaining member separately attached to the end of the connection pipe 52, which is separate from the connection pipe 52, and rises radially outward from the cylindrical press-fit portion 106 and the outer peripheral surface of the press-fit portion 106. The wall portion 108 has a circular shape when viewed in the axial direction, and the press-fitting portion 106 is attached to the end of the connection pipe 52 by press-fitting the press-fit portion 106 into the connection pipe 52 in the axial direction.

The wall portion 108 of the retaining member 104 protrudes radially outward from the outer peripheral surface of the connecting pipe 52 to which the O-ring 112 is attached (the outer peripheral surface fitted into the O-ring 112). A circular annular concave space 110 is formed between the backup ring 102 and an O-ring 112 as a sealing member made of an elastic body such as rubber is fitted in the annular concave space 110. .
The surface 108A on the O-ring 112 side of the wall portion 108 is formed as a flat surface that rises perpendicularly from the outer peripheral surface of the connection pipe 52 in the radial direction.

  If the O-ring 112 is fitted in the connecting pipe 52 in the axial direction before the retaining member 104 is attached to the connecting pipe 52, the edge of the end face of the connecting pipe 52 made of a copper pipe or the cutting of the copper pipe is performed. Since the O-ring 112 may be damaged by burrs or the like that sometimes occur, the O-ring 112 is fitted to the connection pipe 52 after the retaining member 104 is attached here.

FIG. 9 specifically shows the configuration of the retaining member 104.
As shown in the figure, a plurality of ribs 114 extending in the axial direction as protrusions are provided at regular intervals in the circumferential direction on the outer peripheral surface of the press-fitting portion 106 having a cylindrical shape. The plurality of ribs 114 are press-fitted into the connection pipe 52 up to a position where the wall 108 is brought into contact with the axial end of the connection pipe 52.
Each rib 114 has the same protruding height from the outer peripheral surface of the press-fit portion 106.

These ribs 114 have a partially circular outer shape in a cross section, here, a substantially semicircular or arcuate curved shape.
Further, each rib 114 has a radially outward projecting end (outer peripheral end) shape toward the distal end side in the press-fitting direction of the retaining member 104 as shown in FIG. It is made into the inclination shape inclined by angle (alpha) so that protrusion height may become small gradually as it leaves | separates.

In this embodiment, each rib 114 is provided at a position spaced apart from the wall portion 108 in the axial direction.
The wall portion 108 is provided with a plurality of through-holes 116 that pass through the wall portion 108 in the axial direction at the circumferential position where the rib 114 is located and have a circular shape in the axial direction, corresponding to the rib 114. .

  Further, the press-fit portion 106 has a partial circular shape with a cross-sectional shape that is recessed from the outer peripheral surface of the press-fit portion 106 from the rib 114 to the wall portion 108 between the rib 114 and the wall portion 108. A plurality of grooves 118 having an arc shape are provided at circumferential positions where the ribs 114 are located.

These grooves 118 continue to the through holes 116 of the wall 108 as they are. That is, the cross-sectional shape of the groove 118 and the cross-sectional shape of the through hole 116 corresponding to the groove 118 are the same (see FIG. 9E).
As shown in FIG. 9C, a flat portion 120 is partially formed in the wall portion 108 in the circumferential direction. The flat portion 120 is provided so that the resin solidified at the gate portion at the time of molding does not protrude beyond the outer diameter of the wall portion 108. By leaving the resin of the gate part, it is possible to prevent the resin of the gate part from protruding beyond the outer diameter of the wall part 108.

  In the present embodiment, when the resin retaining member 104 is press-fitted and attached to the connecting pipe 52, a part of the outer peripheral end side of the rib 114 is made of a copper pipe as shown in FIGS. 10 (A) and 10 (B). It is shaved at the end of the connecting pipe 52 and shavings K are generated as shown in FIG.

  In this embodiment, the shavings K are provided at a position where the rib 114 is separated from the wall portion 108 in the axial direction. Therefore, the rear end of the rib 114 in the press-fitting direction, that is, the rear end on the wall portion 108 side is connected pipe. It is well separated from the rib 114 when it passes through 52 axial ends.

  The separated swarf K is discharged to the outside through the through-hole 116 of the wall portion 108 provided at the same circumferential position as the rib 114. At this time, the rib 114 and the wall portion 108 are press-fitted. Since the groove 118 having a shape recessed from the outer peripheral surface of the portion 106 is provided, the shavings K enter the inside of the groove 118 as shown in FIGS. 52 is smoothly pushed out of the through hole 116 through the through hole 116 and discharged.

By providing the groove 118 in this way, the shavings K can be guided well into the through hole 116, and therefore the shavings K can be smoothly discharged to the outside in the axial direction of the wall portion 108 through the through hole 116. Can do.
Further, since the groove 118 is provided in a form recessed from the outer peripheral surface of the press-fit portion 106, the outer diameter of the wall portion 108 can be effectively reduced while ensuring a large hole diameter of the through hole 116.

As described above, according to the present embodiment, the O-ring 112 can be prevented from being removed from the connection pipe 52 simply by press-fitting and attaching the retaining member 104 to the connection pipe 52. Therefore, according to the present embodiment, the O-ring 112 can be easily removed. A structure for preventing the O-ring 112 from being removed from the connecting pipe 52 can be realized.
Further, since it is not necessary to directly process the O-ring 112 on the connecting pipe 52 itself, such a retaining structure can be configured at low cost.

  Further, according to the present embodiment, the shavings K generated when the ribs 114 are partially shaved can be discharged to the outside of the wall portion 108 through the through holes 116, so that the shavings K can be removed from the wall. This prevents the O-ring 112 from being damaged by remaining inside the portion 108.

Furthermore, in the present embodiment, since the protrusion for press-fitting is formed with the rib 114, the press-fitting can be performed smoothly, and the frictional force between the protrusion and the connecting pipe 52 is increased after the press-fitting. In particular, the removal force can be effectively increased.
Further, the shape of the radially outward projecting end of the rib 114 is an inclined shape that gradually decreases in diameter toward the distal end side in the press-fitting direction. There is an advantage that it is easy to obtain power.

Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied to various connection pipes other than the connection pipe connected to the valve body of the faucet.
Further, in some cases, it is possible to form a protrusion having another shape in place of the rib 114 so as to protrude from the outer peripheral surface of the press-fitting portion 106, and further to the connection pipe through which a fluid other than water flows. The present invention can be applied in various forms without departing from the spirit of the present invention, such as application of the present invention.

42, 44, 46 Valve body (mating member)
52 Connection pipe 98 Connection hole 104 Retaining member 106 Press-fit part 108 Wall part 112 O-ring (seal member)
114 ribs
116 Through hole

Claims (2)

A ring-shaped sealing member that is attached to the outer peripheral surface of the end of the connecting pipe through which the fluid flows and is connected to the connecting hole of the mating member to seal between the end and the mating member A structure for preventing the seal member from being removed from the connection pipe,
A retaining member having a press-fit portion that is press-fitted into the connecting pipe and a wall portion that rises radially outward from the outer peripheral surface of the press-fit portion, and the press-fit portion is connected to the end of the connecting pipe in the axial direction. From the outer peripheral surface of the connection pipe, and projecting radially outward from the outer peripheral surface of the connection pipe to which the seal member is mounted. The sealing member from the connecting pipe is configured to prevent the sealing member from being pulled out by a stopper action by the wall portion with the wall portion facing the sealing member in the axial direction. Preventing structure. 2. The protrusion according to claim 1, wherein the retaining member has a circumferentially spaced projecting portion projecting outward in the radial direction at a position spaced apart from the wall portion in the axial direction on the radially outer surface of the press-fitting portion. A plurality of them are provided apart, and are press-fitted into the connecting pipe at the protrusions,
The wall portion is provided with a plurality of through-holes penetrating the wall portion in the axial direction at the circumferential position where the protrusion is located, corresponding to the protrusion. Material retaining structure.

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