JP2012197949A - Removal structure of check valve cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removal structure of a check valve cover, which can use an all-purpose check valve cartridge, can easily take out the cartridge by only removing a cover, can attach the cartridge while the cartridge is positioned in a proper direction by only attaching the cover to a body, and is easy in maintenance work.SOLUTION: In the removal structure of the check valve cover, a ring sheet is uniformly sealed on an annular seat formed at the lower end of the check valve cartridge by press-pushing the upper face of a cartridge holder at the lower end of the cover rather than an opening, engagement forces of the cover and the cartridge older are set larger than engagement forces of the check valve cartridge and the cartridge holder when releasing the cover by rotating the cover from the opening, and when separating the cover and the check valve cartridge, the check valve cartridge is removed from the cartridge holder while the cartridge holder remains to be engaged with the cover.

Description

  The present invention relates to a check valve with a built-in check valve cartridge, for example, a check valve installed immediately after a secondary side of a water meter arranged in a meter box, and is used when a meter is periodically replaced or a check valve The present invention relates to a check valve lid attachment / detachment structure that is suitable when maintenance such as check or replacement of a check valve is required due to the occurrence of a malfunction due to a decrease in valve function.

  For this type of check valve, check valves having various structures are provided. Of these, a general-purpose check valve that is opened by closing the ball valve body by its own weight and floating by the fluid in the check valve body. A type in which a stop valve cartridge is detachably incorporated is known (see Patent Document 1). The check valve cartridge shown in Patent Document 1 is a check valve having a structure in which a disc guide, a disc guide, and a ball valve body are provided, and a stopper for preventing rotation is provided on the disc guide. Three stoppers are provided every 90 degrees excluding the direction of the fluid flow path of the check valve.

  FIG. 5 and FIG. 6 in Patent Document 2 show a check valve having a cartridge in which a protrusion is provided on the side surface of the upper ring of the disc guide and the protrusion is fitted into a groove formed in the valve body for positioning. Is disclosed. Further, FIG. 2 in the same document 2 describes a check valve in which a part of the opening of the check valve cartridge itself is closed and this is used as a wall surface to reduce pressure loss and inflow of fluid. Yes.

Further, in Patent Document 3, when an annular mounting member is screwed to the tubular portion of the case in the flow direction, the cartridge body is inserted into the tubular portion of the mounting member, and the cartridge is replaced, A check valve cartridge is disclosed in which the cartridge body is removed from the case along the flow path direction while rotating the cartridge body together with the mounting member, and the cartridge body is removable.
Japanese Utility Model Publication No. 57-166961 Japanese Patent No. 3453424 Japanese Patent No. 3998662

  Since the conventional check valve is disassembled using a dedicated tool or the like, it takes time to replace it, and not only does it take time for on-site maintenance, but it is also not technically easy. In particular, in an environment check valve installed in a water meter box, when the meter is installed at a depth of 60 cm or less from the ground to prevent freezing, maintenance of the check valve is difficult. Furthermore, in an emergency such as an earthquake disaster, the cartridges that make up the check valve are not compatible in terms of dimensions, and therefore, it took time for recovery work, including arrangement of check valve parts.

  The above-described check valve shown in Patent Document 1 or Patent Document 2 uses a cartridge that is available for general use, but the maintenance work in the water meter box must still be performed in a narrow space. First, after removing the lid using a long wrench or special tool, it is necessary to take out the cartridge using a special or dedicated tool, and it is still difficult to perform maintenance work.

  In addition, the check valve shown in Patent Document 3 is a cartridge in which an annular mounting member is detachably provided by screw connection. However, the check valve is not a general-purpose cartridge, and it can be removed by rotating a lid. In addition, when mounting or removing the cartridge, not only is the position of the cartridge fixed, but also the attachment and detachment in the direction of the flow path requires a lot of maintenance work, especially in the water meter box. This check valve is not suitable for maintenance work.

  The present invention has been developed in view of the above-mentioned circumstances, and the object of the present invention is to use a general-purpose check valve cartridge, and the cartridge can be easily taken out simply by attaching and detaching the lid. It is possible to mount the cartridge in a state where it is positioned in an appropriate direction simply by mounting the lid on the main body, and the built-in cartridge forms an optimum piping path in controlling the flow rate and pressure loss. is there.

  In order to achieve the above object, the invention according to claim 1 is characterized in that an annular engagement groove is formed on the inner peripheral surface of the lid that covers the opening of the valve main body having an annular seat therein. The engaging portion of the cartridge holder is rotatably engaged with the engaging groove with a predetermined engaging force, and the engaging protrusion of the cartridge holder is engaged with the protruding portion of the check valve cartridge with the predetermined engaging force. The check valve cartridge is detachably attached to and removed from the opening, and the upper surface of the cartridge holder is pressed by the lower end of the lid from the opening to be provided at the lower end of the check valve cartridge. The ring seat is uniformly sealed to the annular seat, and when the lid is rotated from the opening to release the lid, the engagement force between the lid and the cartridge holder is applied to the check valve. Of the cartridge and the cartridge holder When the cover body and the check valve cartridge are separated from each other when the engagement force is larger than the engagement force, the check valve cartridge is removed from the cartridge holder while the cartridge holder is engaged with the lid body. It is the attachment or detachment structure of the cover for check valves.

  Therefore, according to the first aspect of the present invention, a general-purpose check valve cartridge can be used, and the check valve cartridge can be easily taken out only by attaching and detaching the lid, and the lid is attached to the valve body. It is possible to provide a check valve which can be mounted with a check valve cartridge in a state where it is securely positioned in an appropriate direction only by mounting, and which has formed an optimal piping path that suppresses pressure loss. They are interchangeable, make it easy to arrange check valve components, etc., and have extremely practical value as a check valve disposed in a meter box.

  When the lid is attached to the opening of the valve body, first, the lower end of the engaging part of the cartridge holder is fitted into the groove of the opening so that the check valve cartridge is positioned at the proper position together with the holder. Since the directivity of the check valve cartridge is determined by being positioned on the main body, pressure loss can be reliably suppressed.

  Moreover, since the engaging protrusion of the cartridge holder is engaged with the lower end surface of the protrusion of the general-purpose check valve cartridge, the check valve cartridge is attached to the cover by removing the cover from the opening. The cartridge can be easily removed, so it is easy to replace the cartridge. In particular, it is easy to replace the check valve cartridge in a narrow or dark place or where the check valve is deeply embedded. Is possible.

  An annular engagement groove is provided on the inner peripheral surface of the lid, and the engaging portion provided on the upper or side surface of the cartridge holder is rotatably engaged with the engagement groove. The check valve cartridge is mounted through the groove, and the insertion hole at the lower end of the engaging portion of the cartridge holder is fitted into the groove portion of the opening so that the check valve cartridge is properly positioned together with the cartridge holder. Since the orientation of the check valve cartridge is determined and the cartridge holder is rotatable with respect to the lid, it can be mounted in a reliably positioned state and the pressure loss is suppressed. Can be installed with.

  Furthermore, since a wall surface for preventing pressure loss is provided on the surface of the cartridge holder facing the fluid outflow side, a wall surface forcing the flow direction of the fluid flowing through the check valve cartridge is added to suppress pressure loss. And a general-purpose check valve cartridge can be used.

A preferred embodiment of a check valve in the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a check valve according to the present invention, and is a perspective view showing each component separately. FIG. 2 shows the same check valve cartridge as a lid through a cartridge holder. FIG. 3 is a partially cutaway enlarged perspective view showing a state of being mounted on the body, FIG. 3 is a cross-sectional view of the same check valve, and FIG. 6 is immediately after the secondary side of a water meter unit provided in the meter box. It is explanatory drawing which shows the state which provided the check valve in this invention.

  In FIG. 6, the water meter 3 is connected in the buried meter box 29 connected to the water pipes 1 and 2, and the check valve 4 is joined immediately after the secondary side of the water meter 3. In this case, by providing a protrusion 5 having a predetermined height in the vertical direction on the bottom of the check valve 4, and by placing the bottom of the water meter 3 and the bottom of the protrusion 5 on the same plane as shown in FIG. The axis of the check valve 4 is concentric with the axis of the meter 3. That is, the check valve 4 in the present example is a structure in which the valve is not forcibly closed and the valve body is closed by its gravity, so the valve body is perpendicular to the flow direction of the water pipes 1 and 2. Need to work. Therefore, the check valve 4 can be installed at an appropriate position by the protrusion 5. In FIG. 6, the stop cock 6 and the expansion joint 7 are connected to the primary side of the water meter 3 installed in the meter box 29 and joined to the water pipes 1 and 2.

  In FIG. 3, reference numeral 8 denotes a valve body of the check valve 4. The valve body 8 has an inflow side connection portion 8 a and an outflow side connection portion 8 b, and an annular seat 9 is provided inside the valve body 8. In addition, in this example, three grooves 12 are formed at every 90 degrees excluding the direction of the fluid flow path of the check valve in the lower end of the female screw 11 at the upper opening 10. ing. An external thread 14 of the lid 13 is screwed to the female thread 11 through a gasket 15 in a sealing manner. In this case, a single-letter-shaped handle portion 13b is provided on the upper surface of the lid body 13 so that the lid body 13 can be easily opened and closed with the handle portion 13b manually or by the opener 30 or the like. The shape of the handle portion or the like provided on these lids 13 is arbitrary depending on the implementation. In this case, the lid 13 can be manually opened and closed without using a tool, and a commercially available switch as shown in FIG. 2 in an installation place with a deep embedding depth. 30 can be used to easily open and close the lid 13. As will be described later, the shape provided on the upper portion of the lid 13 can be formed in the shape of the key-type cap 15 or the like.

  In FIG. 1, 16 is a general-purpose check valve cartridge equivalent to Patent Document 1 and Patent Document 2, and this check valve cartridge 16 includes three ring seats 16a, an upper ring 16b, and a lower ring 16c. A ring guide 16e is constituted by four struts 16d, and three protrusions 17 are formed on the outer peripheral side surface of the upper ring 16b. These protrusions 17 can be directly fitted into the groove 12 of the valve body 8. In the ring guide 16e, a ball valve body 18 is closed by its own weight, and is a non-return structure that floats and opens by the pressure of fluid. The valve body 18 is not limited to a spherical shape as long as it can float by the pressure of a fluid, and may have a conical section. The structure of the check valve cartridge is not limited to this example, and may be a cartridge type using a spring, and the number of protrusions 17 is at least two and the number of grooves 12. It may be provided and positioned below.

  In FIGS. 1 and 5, reference numeral 19 denotes a cartridge holder, and this cartridge holder 19 projects three convex engaging portions 21 every 90 degrees around the outer periphery of the circular top plate 20. The engaging portion 21 is formed in an elongated shape in the axial direction of the cartridge holder 19 and along the length direction, and the lower end of the engaging portion 21 is cut and formed in an inclined shape. Thus, a guideable insertion port 22 is formed when the projection 17 is fitted. Further, a misengagement preventing portion 23 for preventing the check valve cartridge 16 from being engaged in a shifted state is provided at the center position of the half circumference of the opposite top plate 20 provided with the engaging portion 21. Provided. The misengagement preventing portion 23 is formed by the projection 23a or the side surface 23b of the top plate 20 so that the projection 17 of the check valve cartridge 16 that is to be engaged in a state shifted in the rotational direction interferes. Is formed.

  In FIG. 1, a wall 24 for preventing pressure loss is provided on the surface of the cartridge holder 19 that faces the fluid outflow side 19 a, and an annular locking portion 25 is provided at the center position on the top plate 20. The locking portion 25 is formed with a plurality of slits 26 so that the locking portion 25 can be expanded and contracted. The locking portion 25 is formed in an annular engagement groove 27 formed on the inner peripheral surface of the lid body 13. It is snap-engaged and is provided in an engaged state so as to be freely rotatable. Further, an engagement protrusion 28 is formed on the inner peripheral surface of the engagement portion 21 of the cartridge holder 19, and this engagement protrusion 28 is engaged with the lower end surface of the protrusion 17 of the check valve cartridge 16. The holder 19 is detachably held on the check valve cartridge 16. The cartridge holder 19 and the check valve cartridge 16 are preferably formed of, for example, a main part made of synthetic resin.

In FIG. 5, the insertion port 22 of the convex engagement portion 21 of the cartridge holder 19 is fitted into the groove portion 12 of the valve body 8 before the lid body 13 is screwed onto the female screw 11 of the valve body 8. Provided. Therefore, the length L ₁ of the engaging portion 21 (the length from the bottom surface of the lid 13 to the tip of the engaging portion 21) and the depth L ₂ at which the groove portion 12 is provided (from the upper surface of the valve body 8 to the groove portion 12). L ₁ > L ₂ is set in relation to the length to the upper end).

  In addition to the example of the engaging protrusion 28, for example, a protrusion (not shown) is extended on the top plate 20 of the cartridge holder 19, and this protrusion is engaged with the upper ring 16b of the check valve cartridge 16. This engagement structure is optional depending on the implementation.

Next, an operation example of the above embodiment will be described.
First, in order to attach the cartridge holder 19 to the check valve cartridge 16, the three protrusions 17 of the check valve cartridge are inserted into the convex engaging portion 21 of the cartridge holder 19, and When the engagement protrusion 28 provided on the inner peripheral surface is engaged with the lower end surface of the protrusion 17, the cartridge holder 19 is engaged and held by the check valve cartridge 16. In this case, since the erroneous engagement preventing portion 23 is provided in the cartridge holder 19, it is possible to reliably prevent the check valve cartridge 16 from being engaged in a state of being shifted at an angle of 90 °, for example.

  Next, when the engaging portion 25 provided on the upper portion of the cartridge holder 19 is engaged with the engagement groove 27 formed on the inner periphery of the lid 13, the check valve cartridge 16 is inserted through the cartridge holder 19. It can be attached to the rotator. Since the cartridge holder 19 is formed in a cylindrical shape having the top plate 20, the entire cartridge holder 19 exhibits a reinforcing function. Therefore, the cartridge holder 19 can be formed thinly with a synthetic resin or the like. The general-purpose check valve 4 inserted in the check valve cartridge 16 can be used, and the convex shape of the cartridge holder 19 is formed between the groove portion 12 of the valve body 8 and the protrusion portion 16 of the check valve cartridge 16. The engaging portion 21 can be inserted. In this example, if the nominal diameter of the check valve is φ20, the thickness of the cartridge holder 19 may be 0.35 mm, the protrusion width of the protrusion 17 of the check valve cartridge 16 is 6.5 mm, and the valve body 8 The groove width of the groove portion 12 is 7.5 mm. The cartridge holder may be attached to the lid in advance, and the check valve cartridge may be engaged and held.

  Next, in order to assemble the cover body 13 to which the check valve cartridge 16 is attached via the cartridge holder 19 to the check valve 4, as shown in FIG. After inserting the insertion ports 22 of the three engaging portions 21 of the cartridge holder 19 into the groove 12, the male screw 14 of the lid 13 is screwed into the female screw 11 of the opening 10. In this case, since the locking portion 25 of the cartridge holder 19 is rotatably locked in the engagement groove 27 formed on the inner peripheral surface of the lid body 13, only the lid body 13 rotates and is surely secured. The lid 13 can be covered with the opening 10 in a screwed state.

  Then, the ring seat 16a of the check valve cartridge 16 is seated on the annular seat 9 in a sealing manner while the engaging portion 21 is inserted into the groove portion 12 by the screwing of the lid body 13, and as shown in FIG. Is covered with the valve body 8 through a gasket 15 in a sealed state, and the assembly of the check valve cartridge 16 can be completed.

  In FIG. 3, the lid body 13 presses the check valve cartridge 16 at the lower end portion of the lid body 13 via the top plate 20 of the cartridge holder 19, so that the lid body 13 reverses to the annular seat 9 inside the valve body 8. The lower part of the ring seat 16a of the stop valve cartridge 16 is uniformly sealed, and there is no possibility that the cartridge holder 19 is vibrated by the fluid. In this case, the ball valve body 18 accommodated in the check valve cartridge 16 is sealed on the upper surface of the ring seat 16a by its own weight, and the ball valve body 18 floats as shown by the chain line in FIG. Is configured to flow in. In addition to the ball valve body 18, the valve body in this example may be a valve body structure incorporating a spring or other valve body structure.

  The inner diameter of the cartridge holder 19, particularly the inner diameter of the locking portion 25, is larger than the outer diameter of the ball valve body 18, so that the ball valve body 18 can be raised to the bottom of the lid body 13 when the valve is fully opened. And a sufficient flow path is secured. Furthermore, a slight gap is provided between the locking portion 25 of the cartridge holder 19 and the locking groove 27 of the lid 13, which obstructs when the pressing surface 13 a of the lid 13 presses the top plate 20. If so.

  In this case, in the cartridge holder 19, the locking portion 25 can rotate with respect to the engaging groove 27 of the lid body 13, and the engaging portion 21 extends in the axial direction in which the lid body 13 is screwed. Since the valve body 8 is provided so as to fit into the groove portion 12, when the lid body 13 is covered with the valve body 8, the engaging portion 21 of the cartridge holder 19 is fitted into the groove portion 12 first. Subsequently, since the lid 13 and the female screw 11 of the valve body 8 are screwed together, the directionality of the check valve 4 containing the check valve cartridge 16 is reliably determined, and optimal flow control and pressure are achieved. A check valve that suppresses loss reduction can be configured. Further, since the cartridge holder 19 is provided with a wall surface 24 forcing the flow direction of the fluid on the surface facing the fluid outflow side, the fluid flows between the valve body 8 and the check valve cartridge 16 at this portion. The pressure loss accompanying the detour in the direction of the lid 13 can be suppressed.

  As shown in FIG. 6, when the lid 13 having the check valve cartridge 16 attached to the check valve 4 connected immediately after the water meter 3 in the meter box 29 is covered, the handle portion 13 b of the lid 13. Can be incorporated manually or by rotating it with a plug opener or the like. In the case of maintenance work or the like, if the lid 13 is rotated in the same manner and the lid 13 is removed from the valve body 8, a check valve Maintenance work of the cartridge 16 and the like can be easily performed.

In FIG. 6, the protrusion 5 having a substantially cross-shaped cross section is provided at the bottom of the valve body 8, so that the protrusion 5 and the water meter 3 can be reliably positioned on the same plane. The shaft center is held concentrically with the shaft center of the water meter 3, and the connecting work is easily performed without the components in the meter box 29 being displaced in the height direction.
Next, in order to replace the check valve cartridge at the time of maintenance, the lid 13 is reversely rotated and removed from the valve body 8. Then, the check valve cartridge 16 can be taken out from the valve body 8 together with the lid 13 via the cartridge holder 19. Then, the old check valve cartridge 16 is removed from the cartridge holder 19 and a new check valve cartridge 16 is mounted. Here, _{F 1} the engaging force between the lid 13 and the cartridge holder 19, when the engaging force between the cartridge holder 19 and the check valve cartridges 16 and _{F 2, advance} as a configuration of the F 1> _{F 2} Thus, when the check valve cartridge 16 as described above is removed from the cartridge holder 19, the cartridge holder 19 is attached to the lid body 13 only by operating to separate the lid body 13 and the check valve cartridge 16. The check valve cartridge 16 can be removed in the engaged state, and the workability is good. As described above, the check valve cartridge 16 that can be inserted and removed together with the lid in the present invention is inserted into the valve body without using a general-purpose cartridge, specifically, a cartridge holder, Since it is possible to use a check valve cartridge in which the protrusion 17 formed on the upper ring 16b of the valve cartridge can be directly fitted into the groove of the valve body 8, it is necessary to increase the number of check valve cartridges required for maintenance. Absent.

  FIGS. 7 to 9 show other examples of the check valve according to the present invention. FIG. 7 is a partially cutaway perspective view showing a state in which the check valve cartridge is attached to the lid through a cartridge holder. FIG. 8 is an exploded perspective view showing the check valve cartridge and the cartridge holder separately, and FIG. 9 is a longitudinal sectional view of the check valve. In this example, the same parts as those in the above example are denoted by the same reference numerals, and description thereof is omitted.

  7 and 8, the cartridge holder 30 is formed with three engaging portions 31 projecting in the axial direction on the outer peripheral surface of the cylindrical body 30a. A locking projection 32 is provided at an upper position on the outer peripheral side surface, and the locking projection 32 is rotatably engaged with the engagement groove 27 of the lid 13. The cylindrical body 30a is provided with a pressure loss preventing wall surface 30c on the surface facing the fluid outflow side 30b, and the other configuration is the same as that of the cartridge holder 19 shown in the above example. An engagement protrusion 33 is provided on the inner peripheral surface of the engagement portion 31, and the engagement protrusion 33 is provided to engage with the lower end surface of the protrusion 17 of the check valve cartridge 16. Yes. In addition, 13c in the figure is a key-type cap provided on the upper part of the lid 13.

  In the above example, the engagement groove 27 is provided on the inner peripheral surface of the lid body 13. However, the present invention is not limited thereto, and an outer peripheral groove (not shown) is formed on the outer peripheral surface of the lid body 13. The engaging protrusion of the cylindrical cartridge holder may be rotatably engaged with the outer peripheral groove, and these structures are optional depending on the implementation. Further, the uneven relationship between the check valve cartridge, the cartridge holder, and the groove of the valve body may be reversed.

FIG. 2 is a perspective view showing an example of a check valve according to the present invention, with each component separated. It is a partially cutaway enlarged perspective view showing a state in which the check valve cartridge is mounted on the lid via a cartridge holder. It is sectional drawing of a check valve same as the above. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a fragmentary sectional view showing the assembly process of the check valve in the same. It is explanatory drawing which shows the state which provided the check valve same as the above in the meter box. It is a partial expansion perspective sectional view showing other examples of a check valve in the present invention. FIG. 9 is an exploded perspective view showing the cartridge of FIG. 8. It is sectional drawing which showed the non-return valve of FIG.

4 Check valve 5 Protrusion 8 Valve body 10 Opening part 11 Female thread 12 Groove part 13 Cover body 14 Male thread 16 Check valve cartridge 17 Protrusion part 19 Cartridge holder 21 Engaging part 25 Engaging part 27 Engaging groove 28 Engaging Protrusion 29 Meter box

Claims (1)

  An annular engagement groove is formed in the inner peripheral surface of the lid that covers the opening of the valve body having an annular seat inside, and the engagement portion of the cartridge holder is rotatably engaged with the engagement groove. Engage with the resultant force, and engage the engagement protrusion of the cartridge holder with the protrusion of the check valve cartridge with a predetermined engagement force so that the check valve cartridge can be inserted and removed from the opening. In addition, the ring seat provided at the lower end of the check valve cartridge is uniformly sealed to the annular seat by pressing the upper surface of the cartridge holder at the lower end of the lid from the opening, and from the opening When the lid body is rotated to disengage the lid body, the engagement force between the lid body and the cartridge holder is set larger than the engagement force between the check valve cartridge and the cartridge holder. The check valve cartridge A check valve lid attaching / detaching structure wherein the check valve cartridge is removed from the cartridge holder while the cartridge holder is engaged with the lid when the die is pulled apart. .

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