JP4755465B2 - Check valve holding device - Google Patents

Description

  The present invention relates to a check valve holding device that holds a check valve in the middle of piping, and more particularly to a structure for mounting the check valve in a replaceable manner.

  Since it has become important to prevent the backflow of water in the water supply piping, for example, a new check valve unit is attached to an existing water supply piping that does not have a backflow prevention function. . In addition, even if the water supply pipe has a check valve unit attached in advance, the check valve unit's backflow prevention function deteriorates due to aging, etc., so the check valve unit is maintained and replaced at regular intervals. It is necessary.

  However, the conventional check valve unit mounting structure for piping is fixed in such a manner that the primary side fixed pipe fixed to the primary side of the pipe and the secondary side fixed pipe fixed to the secondary side are joined together. It is the structure sealed in the state which accommodated the non-return valve unit inside the junction part. Therefore, in order to take out the check valve unit from this pipe, it is necessary to separate the joint between the primary side fixed pipe and the secondary side fixed pipe, and the peripheral pipe to which the fixed pipe is connected must be disassembled. There was a problem.

  In order to avoid such problems, conventionally, an internal space is formed between the primary side and the secondary side of the pipe so that an operator's hand can enter, and the outlet from this internal space to the secondary side flow path is formed. There is a structure with a check valve unit attached. In this case, the internal space is sealed by a cover member fixed by a plurality of bolts in a normal use state, and the cover member is removed during maintenance of the check valve unit, and an operator inserts a hand into the internal space. Since the check valve unit can be removed, it is possible to work without disassembling the surrounding piping.

  However, even in this case, when removing the check valve unit, it is necessary to remove a plurality of bolts and remove the cover member, so the workability is poor and the check valve unit mounting structure is significantly larger than the piping. Therefore, if sufficient space cannot be secured, there is a problem that the above-described structure cannot be provided in the middle of the piping.

  Conventionally, a meter unit provided in a water pipe has been connected to a primary or secondary side of a water meter with a check valve unit incorporating a check valve unit. There was a problem that the check valve unit could not be removed from the backflow prevention device without removing the water device.

  The present invention has been made for the purpose of solving the above-described conventional problems, and it is possible to easily attach and remove the check valve unit to and from the piping without disassembling the surrounding piping. It is possible to provide a check valve holding device which does not require a large space for installation and does not require removal of a water meter during maintenance of the check valve unit even when attached to a meter unit. .

  In order to achieve the above object, the check valve holding device according to the present invention employs as a solving means a diameter-enlarged portion in which the diameter of the pipeline is increased in a part of the pipeline formed along the axial direction. A tube formed by forming an opening in which at least a semicircular portion around the axis is opened on the peripheral wall of the enlarged diameter portion, and a check valve unit accommodated in the enlarged diameter portion via the opening, And a slide tube that is attached to the tube and can slide the side surface of the tube along the axial direction to close the opening. Thus, if the slide tube is slid while the pipes are connected to both ends of the tubular body, the check valve unit held in the enlarged diameter portion can be taken out with the opening being opened. The same applies to the case where the meter unit is connected to the tube, and if the slide tube is slid without removing the water meter, the opening is opened and held in the enlarged diameter portion. The check valve unit can be taken out.

  Further, a pair of O-rings are disposed on the side surface of the tube body in the axial direction across the opening, and the inner surface of the slide tube is in contact with the pair of O-rings to seal the enlarged-diameter portion. As a result, liquid leakage from the gap between the tube body and the slide tube can be prevented.

  An annular wall is formed at the end of the enlarged diameter portion, into which the end of the check valve unit is fitted, and an annular spacer is arranged in the gap of the enlarged diameter portion that is generated when the check valve unit is fitted into the annular wall. With this configuration, the check valve unit accommodated in the enlarged diameter portion can be prevented from moving in the axial direction, and the check valve unit can be fixed.

  Further, a through hole is formed in the side surface of the slide tube, and a plug is provided so as to be detachable from the through hole, so that the inside of the tube can be decompressed if the plug is removed from the through hole. . In particular, when taking out the check valve unit provided in the enlarged diameter portion, the secondary side pressure can be made equal to the atmospheric pressure in advance.

  According to the check valve holding device according to the present invention, since the check valve unit can be attached to and detached from the inside of the pipe body while both ends of the pipe body are fixed to the pipe, the peripheral pipe is disassembled. Therefore, the check valve unit can be easily attached and removed. Since such a check valve holding device does not require a large space when installed in the middle of the piping, there is an advantage that it can be installed even in a relatively narrow space. Furthermore, when this device is applied to a meter unit, the check valve unit can be taken out without removing the water meter, and the working efficiency is improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG.1 and FIG.2 is a figure which shows one structural example of the non-return valve holding | maintenance apparatus 1 in this embodiment, and has shown the partial cross section. FIG. 1 shows a state in which the check valve unit 5 is accommodated in the check valve holding device 1, and FIG. 2 shows a state in which the check valve unit 5 is taken out from the check valve holding device 1. . The check valve unit 5 mounted on the check valve holding device 1 allows the liquid flow from the left to the right in FIG. 1 while passing the reverse flow is prohibited.

  The check valve holding device 1 has a pipe body 2 arranged along the axial direction of a pipe, and a pipe line 3 is formed along the axial direction inside the pipe body 2 and the pipe body. A diameter-enlarged portion 4 is formed on the inner side of the body portion 2a. The enlarged diameter portion 4 is formed so as to conform to the outer shape of the check valve unit 5 and serves as an accommodation space for accommodating the check valve unit 5. The check valve unit 5 is a cylindrical body with a built-in check valve 51, and the check valve 51 is supported by an annular frame 52 as shown in FIG. 53 is provided.

  An opening 6 is formed on the side surface of the body 2 a of the tube body 2 so that the enlarged diameter portion 4 is opened and the check valve unit 5 can be attached and detached. The opening 6 is formed by opening a peripheral wall surrounding the enlarged diameter portion 4 in the body portion 2a of the tubular body 2 by opening at least a half-circumferential portion around the axis, and the length in the axial direction is a check valve unit. 5 is slightly longer than the axial dimension. Therefore, the check valve unit 5 can be attached to the enlarged diameter portion 4 through the opening 6, and the check valve unit 5 attached to the enlarged diameter portion 4 can be taken out from the opening 6.

  On the other hand, the length of the enlarged diameter portion 4 in the axial direction is longer than that of the opening 6, and at least one end in the axial direction of the enlarged diameter portion 4 has substantially the same diameter as the frame 52 of the check valve unit 5. An annular wall 41 is formed. The frame body 52 of the check valve unit 5 is fitted and attached to the inside of the annular wall 41. At this time, the O-ring 53 provided on the outer peripheral side surface of the frame body 52 comes into contact with the annular wall 41 to prevent the fluid from passing outside the check valve unit 5.

  Here, when the check valve unit 5 is mounted on the annular wall 41 provided at one end of the enlarged diameter portion 4, a gap is generated at the other end of the enlarged diameter portion 4. Therefore, in this embodiment, the annular spacer 20 is used to fill this gap, and is arranged in this gap. The annular spacer 20 prohibits the check valve unit 5 from moving in the axial direction, and fixes the check valve unit 5 in a state of being fitted to the annular wall 41 of the enlarged diameter portion 4. This annular spacer 20 is also inserted into the gap of the enlarged diameter portion 4 through the opening 6. As described above, in this embodiment, the check valve unit 5 and the annular spacer 20 are accommodated in the enlarged diameter portion 4, and the tubular body is in contact with the end face of the enlarged diameter portion 4 and is prohibited from moving in the axial direction. 2 is fixed inside the body.

  The tube body 2 is provided with a pair of O-rings 7 and 8 on the side surface of the body portion 2a with the opening 6 interposed therebetween. A slide tube 10 that slides along the axial direction is provided on the outer peripheral side surface of the body portion of the tube body 2. When the slide tube 10 covers the body portion 2a of the tube body 2, the slide tube 10 is opened. 6 is closed, and the inner wall of the slide tube 10 comes into contact with the O-rings 7 and 8 to seal the enlarged diameter portion 4. Therefore, liquid leakage from the gap between the tube body 2 and the slide tube 10 can be prevented. On the other hand, when the slide tube 10 is slid in the axial direction and retracted from the body portion 2a of the tube body 2, the opening 6 is opened, and the check valve unit 5 is attached to the enlarged diameter portion 4 or the enlarged diameter portion. 4 can be taken out.

  A female screw portion 11 is provided on the inner peripheral surface of the end portion of the slide tube 10, and a male screw portion 9 coupled to the female screw portion 11 is provided on the outer peripheral side surface of the body portion of the tube body 2. When the slide tube 10 covers the body portion 2a, the slide tube 10 can be fixed to the tube body 2 in a state where the expanded diameter portion 4 is sealed by coupling the male screw portion 9 and the female screw portion 11 to each other and fastening them. It is a structure. In addition, a through hole 12 is formed on the side surface of the slide tube 10 to release internal pressure, particularly the secondary side pressure of the check valve unit 5 provided in the enlarged diameter portion 4. A removable plug 13 is provided.

  In addition, connecting mechanisms 31 and 32 for connecting pipes or meter units are provided at both ends in the axial direction of the tube body 2, and the check valve holding device 1 is in the middle of piping by the connecting mechanisms 31 and 32. It is fixed at an arbitrary position.

  Next, a procedure for attaching / detaching the check valve unit 5 to / from the check valve holding device 1 having the above structure will be described. First, when the check valve unit 5 is attached to the check valve holding device 1, the slide tube 10 is slid along the axial direction as shown in FIG. 6 is released. A plug 13 may be attached to the through hole 12 of the slide tube 10 in advance. Then, the check valve unit 5 is inserted into the enlarged diameter portion 4 from the opened opening 6, and the check valve unit 5 is pushed into the annular wall 41. Thereby, the check valve unit 5 is fitted. Then, after inserting the annular spacer 20 into the gap of the enlarged diameter portion 4, the slide tube 10 is slid to cover the body portion 2 a of the tube body 2, and the male screw portion 9 and the female screw portion 11 are coupled to each other to connect the slide tube 10. Fasten and fix. As a result, the check valve holding device 1 is in the state shown in FIG. 1 and is attached with the check valve unit 5 fixed to the enlarged diameter portion 4.

  Next, when removing the check valve unit 5 from the check valve holding device 1, first, the plug 13 provided in the through hole 12 of the slide tube 10 is removed, and the secondary pressure of the check valve unit 5 is reduced. To the same pressure as the atmospheric pressure. This facilitates the subsequent work. Then, the fastening state of the tube body 2 and the slide tube 10 is loosened, the slide tube 10 is slid along the axial direction to be retracted from the body portion 2a, and the opening 6 is opened. Then, the annular spacer 20 is taken out from the opened opening 6 first. Subsequently, the check valve unit 5 is pulled out into the gap portion of the enlarged diameter portion 4 from which the annular spacer 20 has been removed, and the state of being fitted into the annular wall 41 is released. Then, the check valve unit 5 is taken out from the opening 6. Thereby, the check valve holding device 1 is in the state shown in FIG. 2, and the check valve unit 5 is taken out from the inside of the device.

  As described above, the check valve holding device 1 attaches the check valve unit 5 to the enlarged diameter portion 4 in which the diameter of the pipe line 3 is enlarged through the opening 6 provided on the side surface of the body portion of the tube body 2. Further, the tube body 2 is provided with a slide tube 10 that can slide the body side surface along the axial direction to close the opening 6. When the slide tube 10 is retracted from the body 2a, the opening 6 is opened to attach or remove the check valve unit 5 while the slide tube 10 closes the opening 6 to cover the opening 2a. Therefore, even when pipes are connected to the coupling mechanisms 31 and 32 provided at both ends of the pipe body 2, without disassembling the surrounding pipes, the pipes are still connected, The check valve unit 5 can be attached and removed. Therefore, at the time of maintenance of the check valve unit 5, the check valve unit 5 can be easily taken out from the middle of the piping, and replacement work and the like can be performed efficiently.

  In addition, since the check valve holding device 1 does not require a wide space for installation, there is an advantage that it can be installed even in a relatively narrow space. Furthermore, when the check valve holding device 1 is applied to a meter unit, the check valve unit can be taken out without removing the water meter, and work efficiency is improved.

It is a partial cross section figure which shows the structural example of a non-return valve holding | maintenance apparatus, and has shown the state which accommodated the non-return valve unit in the enlarged diameter part inside a pipe body. It is a partial cross section figure which shows the structural example of a non-return valve holding | maintenance apparatus, and has shown the state which took out the non-return valve unit from the enlarged diameter part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Check valve holding | maintenance apparatus 2 Tubing body 3 Pipe line 4 Diameter expansion part 5 Check valve unit 6 Opening part 7,8 O-ring 10 Slide pipe 12 Hole 13 Plug 20 Annular spacer 41 Annular wall

Claims (2)

A part of the pipe formed along the axial direction is provided with an enlarged diameter part formed by expanding the diameter of the pipe, and an opening is formed in the peripheral wall of the enlarged diameter part so that at least a half circumference part around the axis opens. And the tube
A check valve unit housed in the enlarged diameter portion through the opening;
A check valve holding device comprising: a slide tube that is mounted on the tube and that can slide along a side surface of the tube along the axial direction to close the opening .
An annular wall into which an end portion where the O-ring of the check valve unit is disposed is formed at the end portion of the enlarged diameter portion of the tubular body, and the check valve unit is fitted and attached to the annular wall An annular spacer is arranged in the gap of the enlarged diameter portion generated in
A pair of O-rings are arranged on the side surface of the tubular body in the axial direction with the opening interposed therebetween, and the inner surface of the slide tube contacts the pair of O-rings to seal the enlarged diameter portion. Check valve holding device. The check valve holding device according to claim 1, wherein a through hole is formed on a side surface of the slide tube, and a plug detachable from the through hole is provided.

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