JP4038802B2 - Check valve mounting structure - Google Patents

Description

The present invention relates to a check valve mounting structure for mounting a check valve unit having a check valve therein in a replaceable manner in an existing water supply pipe.

  Since it has become important to prevent the backflow of water in the water supply pipe, for example, a check valve is newly attached to an existing water supply pipe that does not have a backflow prevention function.

  In addition, even in a water supply pipe to which a check valve is attached in advance, the check flow prevention function is deteriorated due to secular change or the like, and therefore it is necessary to perform check valve maintenance and replacement work at regular intervals.

  Conventionally, a stop cock provided in an existing pipe is provided with an expansion / contraction union, and the structure is relatively easy to attach / detach to / from the pipe. Therefore, the stop cock is replaced with a stop cock with a check valve. Therefore, a backflow prevention function is provided.

  By the way, it is desirable to make the check valve as easy as possible when installing or replacing the check valve with respect to the existing water supply pipe, and when replacing the check valve, it is possible to reduce the number of parts to be replaced as much as possible. desired.

  However, the conventional check valve mounting structure is a structure that seals the check valve using a metal stopper inside the stop cock or expansion / contraction union, so take out only the check valve. There was a problem that was difficult. Therefore, when the check valve is replaced, the stop cock is replaced with a check valve built-in type, and the part cost at the time of replacement becomes higher than the part cost of the check valve itself. Conventionally, when performing maintenance and replacement work with only the check valve taken out, it is necessary to remove the dedicated stop using a dedicated tool, but even in that case, take it out without damaging the check valve. This is extremely difficult, and there is a problem that work efficiency is remarkably lowered. Furthermore, when a special tool was not brought, it was not possible to take out only the check valve.

The present invention has been made for the purpose of solving the above-mentioned conventional problems, and it is possible to attach a check valve to the middle of an existing water supply pipe with a simple operation, and for maintenance and replacement work. Provided is a check valve mounting structure in which a check valve can be easily taken out without using a tool.

In order to achieve the above object, the present invention adopts a check valve mounting structure in which a check valve unit provided with a check valve inside is replaceably mounted in the middle of an existing water supply pipe. In addition , one side of the check valve unit is housed in a housing tube that is detachable from the pipe, and a stationary tube is attached to the other side of the check valve unit to accommodate the stationary tube. A first groove of the accommodating tube formed on the outer peripheral side surface of the joint portion with the fixed tube, and a second groove of the stationary tube formed on the outer peripheral side surface of the joint portion with the accommodating tube A C-shaped ring member is mounted on a double annular groove formed by fixing the fixed pipe and the receiving pipe in a joined state, and the check valve unit is placed inside the receiving pipe and the fixed pipe. It is in the point of having a structure that can be accommodated and fixed in a replaceable manner .

Furthermore, the check valve mounting structure is preferably provided in an expansion / contraction union of a stop cock installed in the middle of an existing water supply pipe.

The check valve mounting structure is preferably provided in a pipe joint installed in the middle of the existing water supply pipe.

According to the check valve mounting structure adopted by the present invention as a solution , the C-shaped ring member is mounted on the double annular groove by manually expanding the end of the C-shaped ring member, Alternatively, the ringed state can be released, whereby the fixed tube and the receiving tube can be fixed in a joined state, or the fixed state can be released, so that the check valve can be easily placed inside the receiving tube and the fixed tube. The unit can be attached, and the check valve unit can be easily taken out from the inside of the receiving tube and the fixed tube. And since the containment pipe can be attached to and detached from the pipe, a check valve can be attached to the middle of the pipe with a simple operation, and it can be easily checked without using a dedicated tool during maintenance or replacement work. The valve can be removed.

  Then, by providing the check valve mounting structure as described above in the expansion / contraction union of the stop cock installed in the middle of the piping, the check valve can be mounted in the middle of the piping by an extremely simple operation. Therefore, the backflow prevention function can be efficiently provided only by performing a simple construction on the existing water supply pipe that does not have the backflow prevention function.

  Further, by providing the above-described check valve mounting structure in a pipe joint installed in the middle of the piping, the check valve can be mounted in the middle of the piping by an extremely simple operation. Further, in this case, a check valve can be attached to any pipe portion regardless of the position of the stop cock or the like. Therefore, also in this case, the backflow prevention function can be efficiently attached only by performing a simple construction on the existing water supply pipe that does not have the backflow prevention function.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, as an example, a structure in which a check valve is provided for a stop cock provided in the middle of a water supply pipe, more specifically, in order to make the stop cock detachable from the pipe, The structure which attached the check valve (check valve unit) to the inside of the expansion / contraction union (expansion pipe) provided in connection is illustrated.

FIG. 1 is a view showing a configuration aspect of a check valve mounting structure according to the present invention. In this aspect, a telescopic union (expandable tube) 1 is detachably connected to one side of the water stop cock 100, and a cylindrical check valve unit 3 is accommodated inside the telescopic union 1. It is fixed with. The check valve unit 3 includes a check valve inside. For example, when the check valve unit 3 flows in the right direction in the figure, the check valve moves to the right and the check valve unit 3 The left end opening is opened to guide the water flow downstream. On the other hand, when the water flow flows from the downstream side to the left direction (upstream side), the check valve moves leftward to close the left end opening, thereby preventing the reverse flow upstream.

  2 and 3 are views showing the telescopic union 1, FIG. 2 shows a state in which the check valve unit is housed and assembled inside the telescopic union 1, and FIG. 3 shows a state in which the telescopic union 1 is disassembled. Is shown. As shown in FIGS. 2 and 3, the telescopic union 1 includes a receiving tube 2 that houses one end of a check valve unit 3 that includes a check valve therein, and an other end of the check valve unit 3. A fixed pipe 4 which is attached to the portion and fixes the check valve unit 3, a resin ring member 5 which fixes the receiving pipe 2 and the fixed pipe 4 in a state where the check valve unit 3 is received, A coupling fitting 13 for coupling to the stopper 100, a sliding pipe 16 provided so as to be slidable with respect to the receiving pipe 2, and a coupling fitting 18 for coupling the sliding pipe 16 to a downstream pipe. It is configured with.

  When assembling the telescopic union 1, for example, as shown in FIG. 3A, the end of the check valve unit 3 is fitted inside the fixed pipe 4 so that the end 3 a of the check valve unit 3 is fixed. The state is in contact with the inner wall 4 b of the tube 4. As a result, the fixed pipe 4 is attached to the check valve unit 3. As shown in FIG. 3B, the portion where the check valve unit 3 is exposed from the fixed tube 4 is accommodated inside the accommodating tube 2, and the end of the fixed tube 4 and the end of the accommodating tube 2 are mutually connected. It shall be in the state of contact. As a result, the check valve unit 3 is housed inside the housing tube 2 and the fixed tube 4. The procedure for housing the check valve unit 3 inside the housing tube 2 and the fixed tube 4 may be the reverse of the above procedure. For example, the check valve unit 3 is placed inside the housing tube 2 first. The fixed pipe 4 may be attached to the portion that is accommodated and exposed from the accommodating pipe 2 of the check valve unit 3.

  As shown in FIG. 3, an introduction opening of the check valve unit 3 is formed in the storage pipe 2, and a first annular groove 2 a is formed on the outer peripheral side surface of the opening end joined to the fixed pipe 4. Further, a second opening having a depth and a width similar to those of the first annular groove 2a is formed on the outer peripheral side surface of the opening end portion which forms the introduction opening of the check valve unit 3 in the fixed tube 4 and is joined to the receiving tube 2. An annular groove 4a is formed. When the check valve unit 3 is housed inside the housing tube 2 and the fixed tube 4 and the ends of the housing tube 2 and the fixed tube 4 are in contact with each other, the first annular groove 2a and the second annular groove 2a The groove 4a forms a double annular groove adjacent to each other.

  As shown in FIG. 5, the ring member 5 is a C-shaped ring member having a U-shaped cross section in which a groove 51 is formed on the inner surface. The groove 51 formed on the inner surface of the ring member 5 is formed to have substantially the same depth as the first and second annular grooves 2a and 4a, and the groove width is formed by the housing tube 2 and the fixed tube 4 contacting each other. It is formed so as to substantially match the width of the first groove 2a and the second groove 4a in the double annular groove. Further, the ring member 5 is formed of a resin material, and if the operator operates with a finger, the ring end portions 52 and 53 are easily expanded in a direction away from each other, and the ring diameter can be slightly increased. . When the operator removes his / her finger from the ring member 5, the ring member 5 returns to the original C-shaped ring shape.

  As described above, the ring member 5 may be formed of a material that can easily widen the interval between the ring end portions 52 and 53 by an operator's finger operation. It may be formed using an elastic metal material or other material instead of a material.

  Then, the ring member 5 is mounted on the double annular groove formed at the joint portion between the housing tube 2 and the fixed tube 4. Before the accommodation tube 2 and the fixed tube 4 are joined, the ring member 5 is previously wrapped around one of the first groove 2a and the second groove 4a. When joining, the ring end portions 52 and 53 of the ring member 5 mounted on one side are expanded as described above to increase the ring diameter. When the assembling work is performed according to the procedure of mounting the groove, the ring member 5 can be mounted on the double annular groove by an extremely simple operation.

  When the ring member 5 is mounted in the double annular groove formed at the joint portion between the storage tube 2 and the fixed tube 4, the fixed tube 4 is fixed in a state of being connected to the storage tube 2. As a result, the telescopic union 1 shown in FIG. 2 is configured, and the check valve unit 3 is housed and fixed inside the housing tube 2 and the stationary tube 4.

  Then, as shown in FIG. 4, until the fixed tube 4 of the telescopic union 1 is directed into the connecting pipe of the stop cock 100, and the tip of the fixed pipe 4 comes into contact with the peripheral wall 101 provided in the connecting pipe of the stop cock 100. The expansion / contraction union 1 is attached to the water stop cock 100 by pushing in and screwing the connection metal fitting 13 into the threaded portion 102 provided on the outer peripheral side surface of the connection pipe. At this time, as shown in FIG. 1, an O-ring 11 is provided on the side surface of the fixed tube 4, and an O-ring 12 is provided on the side surface of the housing tube 2. The inside of the pipe is sealed by contacting the inner wall surface of the stopper 100.

  Then, by sliding the sliding tube 16 with respect to the housing tube 2, the expansion / contraction union 1 is expanded / contracted to have an appropriate length for connection with the downstream side pipe, and a threaded portion provided on the outer peripheral side surface of the downstream side pipe The telescopic union 1 is connected to the downstream pipe by screwing the connecting metal fitting 18 into the pipe. Note that an O-ring 17 in contact with the inner surface of the sliding tube 16 is provided at the end of the housing tube 2, and the O-ring 17 is configured to seal the inside of the tube. Further, the sliding tube 16 is provided with a screw 14 and a ring 15. The screw 14 has a function of fixing the sliding tube 16 and preventing the sliding tube 16 from coming out of the housing tube 2. The ring 15 has a function of preventing the sliding tube 16 from rattling and preventing foreign matter from entering the tube. However, the screw 14 and the ring 15 are not necessarily provided with both, and may be provided with only one of them. Further, the connection structure between the sliding tube 16 and the housing tube 2 is not limited to that shown here, and other structures may be adopted.

  The check valve unit 3 attached in the existing pipe as described above can be easily taken out by proceeding with the procedure reverse to the above. That is, first, after loosening the connection fittings 13 and 18, the telescopic union 1 is removed from the pipe. At this time, since the fixed tube 4 is connected to the storage tube 2 by the ring member 5, if the storage tube 2 is pulled out from the water stop cock 100, the fixed tube 4 and the storage tube 2 enter the check valve unit 3. It is taken out integrally in the state which accommodated. Then, by expanding the end portions 52 and 53 of the ring member 5 with fingers to increase the ring diameter, the locking state of the fixed tube 4 and the storage tube 2 by the ring member 5 is released, and the fixed tube 4 is stored in the storage tube 2. Pull away from. Then, the check valve unit 3 is pulled out from the receiving tube 2 integrally with the fixed tube 4. If the fixed pipe 4 and the check valve unit 3 are separated, the check valve unit 3 can be taken out without being damaged.

  As described above, this embodiment does not require any tools when attaching the check valve unit 3 to the expansion / contraction union 1 or when removing the check valve unit 3 from the expansion / contraction union 1. It can be installed and removed at work. Further, when removing the check valve unit 3, it can be removed without damaging the check valve unit 3. Therefore, after the check valve unit 3 is maintained, it is returned to the telescopic union 1 again and used. It is also possible.

  Therefore, in the present embodiment, one side of the check valve unit 3 is housed in the housing pipe 2 that can be attached to and detached from the pipe, and the fixed pipe 4 is attached to the other side of the check valve unit 3. The fixed tube 4 is brought into contact with the housing tube 2 and formed on the outer peripheral side surface of the joint portion between the first groove 2 a of the housing tube 2 formed on the outer peripheral surface of the joint portion with the fixed tube 4 and the housing tube 2. The fixed tube 4 and the housing tube 2 are configured to be fixed in a joined state by mounting the resin-made C-shaped ring member 5 on the double annular groove formed of the second groove 4a of the fixed tube 4. As a result, the check valve can be attached to the middle of the piping with a simple operation, and the check valve can be easily removed without using a dedicated tool during maintenance or replacement work. Yes.

(Modification)
Although embodiments have been described about the present invention, the present invention is not intended to be limited to the above.

  For example, in the above description, the structure in which the check valve unit is provided with respect to the expansion / contraction union of the stop cock provided in the middle of the water supply pipe is described, but it is not limited thereto. That is, if the accommodation pipe which accommodates the check valve unit is detachable from the pipe, the above-described configuration can be applied thereto. For example, what is called a single check valve is a type of piping joint that houses a check valve unit inside the tubular body of the joint body, and is installed in the middle of the pipe independently of the water stopcock and telescopic union. However, the above-described configuration can also be applied as a check valve mounting structure in such a pipe joint. Even in this case, the check valve can be attached to the middle of the pipe by a simple operation, and the check valve can be easily taken out without using a dedicated tool during maintenance or replacement work. . Moreover, there exists an advantage that a non-return valve can be attached irrespective of the installation position of a stop cock by providing the above-mentioned non-return valve attachment structure with respect to a coupling.

It is a figure which shows the structure aspect of the non-return valve attachment structure which concerns on this invention. It is a figure which shows the state assembled by accommodating the non-return valve unit in the expansion / contraction union. It is a figure which shows the state which decomposed | disassembled the expansion-contraction union. It is a figure which shows the state just before attaching an expansion / contraction union to a water faucet, or the state immediately after removing an expansion / contraction union from a water faucet. It is a figure which shows a C-type ring member.

Explanation of symbols

1 Telescopic union (expandable tube)
2 receiving tube 2a groove (first groove)
3 Check valve unit 4 Fixed pipe 4a Groove (second groove)
5 Ring member 100

Claims (3)

A check valve mounting structure for mounting a check valve unit provided with a check valve inside the existing water supply pipe in a replaceable manner,
Accommodates one side of the check valve unit in the interior of the removable reservoir tube with respect to the pipe, in the housing tube by fitting the fixed tube the fixing tube to the other side of the check valve unit A first groove of the storage tube formed on the outer peripheral side surface of the joint portion with the fixed tube, and a second groove of the fixed tube formed on the outer peripheral side surface of the joint portion with the storage tube A C-shaped ring member is mounted on a double annular groove, and the fixed pipe and the receiving pipe are fixed in a joined state, and the check valve unit can be exchanged inside the receiving pipe and the fixed pipe. Non-return valve mounting structure characterized by being housed and fixed to . A check valve mounting structure, wherein the check valve mounting structure according to claim 1 is provided in a telescopic union of a stop cock installed in the middle of an existing water supply pipe . A check valve mounting structure, wherein the check valve mounting structure according to claim 1 is provided in a pipe joint installed in the middle of an existing water supply pipe .

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