JP6339054B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve, and more particularly to a check valve suitably used in a water meter unit.

  In general, a water meter unit for measuring the amount of water used is installed near the doorway of a house or apartment house. One end of the water meter unit is connected to a water supply pipe on the primary side (supply side), and the other end is connected to a water supply pipe on the secondary side (use side). In this configuration, water is supplied from the primary side to the secondary side via the water meter unit, and the water meter incorporated in the water meter unit can indicate the amount of water flowing therethrough.

  Thus, the water meter installed in the middle of the water pipe needs to be replaced after a predetermined period defined by the Measurement Law. For this reason, the water meter is attached to the water meter unit in a replaceable manner by a method such as a screw fixing type or a pressure fixing type. At present, a crimping and fixing type with excellent workability is often employed.

  The pressure-fixing type water meter unit includes, for example, a base, a primary meter holding member supported on one end of the base, and a secondary meter holding member supported on the other end of the base. A water meter is attached between the primary meter holding member and the secondary meter holding member. The primary / secondary meter holding member and the water meter are connected and fixed using, for example, a slide member that is screwed into a thread groove formed in the inlet pipe / outlet pipe of the water meter and changes its position by rotation. Done. The water meter unit may further include a pressure reducing valve or a stop cock connected via a joint on the upstream side of the primary side meter holding member.

  In the secondary meter holding member of the water meter unit, a check valve for preventing a backflow from the secondary side to the primary side may be provided (for example, Patent Document 1). The check valve prevents the water on the primary side from being contaminated by the backflow from the secondary side.

  Various aspects have been proposed as the check valve, and for example, the check valve unit may be attached to the secondary meter holding member as a cartridge type check valve unit. Further, in Patent Document 2, a check valve unit can be accommodated from an opening provided in a joint-shaped casing, so that a check valve can be attached without removing the pipe at any part of the water pipe. The structure to perform is disclosed.

JP 2006-265990 A JP 2011-190867 A

  In a general check valve, when the water stops, the valve body is pressed against the valve seat packing by an urging means such as a coil spring to block the flow path. In this state, the check valve is in a closed state, and backflow from the secondary side to the primary side is prevented. On the other hand, at the time of water flow, the valve body is pushed down by water pressure and separated from the valve seat packing. Thereby, the flow path is opened between the valve body and the valve seat packing, and the check valve is opened, so that water can be supplied from the primary side to the secondary side.

  When the check valve is closed during the transition from the water flow time to the water stop time, the valve body moves until it comes into contact with the valve seat packing. At this time, if the movement of the valve body is abrupt, the water flow is suddenly stopped, and the water pressure temporarily rises in the pipe. This can cause a water hammer, which can damage the piping and generate an unpleasant sound.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a check valve that can prevent the occurrence of defects during the closing operation.

A check valve according to an embodiment of the present invention includes a main body, a valve body movably provided inside the main body, and a valve seat fixed to the main body, and the valve body and the valve in a closed state. A check valve configured to block a flow path by contacting a seat and to open the flow path by separating the valve body and the valve seat in an open state, and is fixed to the main body A shaft member and an urging spring connected to the valve body, the valve body having a recess on a side opposite to the side in contact with the valve seat, and the inner side of the recess of the valve body end of the biasing spring and the shaft member is disposed, together with the discharge passage for communicating with the space surrounded by the end of the shaft member and the front Kiben body inside the shaft member is provided, Constructed so that fluid can flow into the space through a gap between the valve body and the shaft member The discharge path includes a first discharge path provided on the side of the space and a second discharge path communicating with the first discharge path, and the first discharge path and the A non-return packing for preventing a back flow from the second discharge path to the first discharge path is provided between the second discharge path and the second discharge path .

  In one embodiment, a plurality of the first discharge paths are provided, and one second discharge path is provided in common with the plurality of first discharge paths.

  In one embodiment, the shaft member is provided with a through hole that is not covered by the check packing and communicates with the space.

  In one embodiment, when the check valve shifts from the open state to the closed state, fluid flows into the space preferentially through a gap between the valve body and the shaft member, When shifting from the closed state to the open state, the fluid in the space is preferentially discharged to the outside through the discharge path.

  In one embodiment, the main body includes a plurality of rod-shaped guide portions disposed outside the valve body.

  According to the embodiment of the present invention, it is possible to prevent a failure from occurring when the check valve is closed.

It is a side view which shows the whole water meter unit in which the check valve which concerns on embodiment of this invention was integrated, and is partially cut away sectional drawing so that the inside of a secondary side meter holding member may be shown. It is sectional drawing of the non-return valve which concerns on embodiment of this invention, (a) shows the cross section at the time of water stop (closed state), (b) shows the cross section at the time of water flow (open state). (A) is a side view of the check valve shown in FIG. 2, (b) is a side view when viewed from the right side of the drawing, and (c) is a top view. It is typical sectional drawing for demonstrating operation | movement of the non-return valve which concerns on embodiment of this invention, (a)-(d) shows another state, respectively. (A) is a top view of the hole formation member in which the 1st discharge path was formed, (b) is a top view of non-return packing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments described below.

  FIG. 1 shows an overall configuration of a water meter unit 1 to which a check valve 10 according to an embodiment of the present invention is attached. The water meter unit 1 includes a long plate-shaped base 20, a primary meter holding member 22 and a secondary meter holding member 24 that are supported on both ends of the base 20 so as to be separated from each other, and a primary meter holding member 22. A water meter 26 detachably attached to the secondary meter holding member 24 is provided. The water meter 26 is configured to indicate the amount of water that has flowed from the primary side to the secondary side. As the water meter 26, water meters of various known modes can be used.

  An inlet pipe 26 a of the water meter 26 is attached to the primary meter holding member 22 by a slide member 23. The outlet pipe 26b of the water meter 26 is attached to the secondary meter holding member 2 by a similar slide member (not shown).

  The slide member 23 is configured to be screwed into, for example, a screw groove formed in the outer peripheral portion of the inlet pipe 26a of the water meter 26, and the shaft is formed by rotating the slide member 23 using the handle portion. It is possible to move in the direction. In this configuration, the primary side holding member 22 and the water meter 26 can be connected and fixed by moving the slide member 23 away from the water meter 26. Connection and fixing of the secondary side holding member 22 and the water meter 26 can be performed by the same method. However, attachment of the water meter 26 to the primary side holding member 22 and the secondary holding member 24 is not limited to the mode described above, and can be performed by various known modes.

  The upstream end of the primary meter holding member 22 is connected via an elbow 28 to, for example, a water pipe installed by a water department or a water company. Although not shown in the drawing, the water meter unit 1 may integrally include other members such as a pressure reducing valve, a water stop cock, and an expansion tube on the upstream side of the elbow 28 as a unit. Moreover, the downstream end of the secondary meter holding member 24 is connected to, for example, a water supply pipe in the house. In this configuration, when the user opens the water tap, water is supplied to the downstream side from the upstream water pipe through the water meter unit 1.

  In the water meter unit 1, the check valve 10 according to this embodiment is attached to the inside of the secondary meter holding member 24. The check valve 10 operates so that water flows from the primary side to the secondary side when water flows, and when the water is stopped, the valve is closed to shut off the flow path to close the flow path from the secondary side to the primary side. Operates to prevent backflow.

  In the present embodiment, the check valve 10 is attached by fitting the check valve 10 into the inside thereof from the opening of the secondary meter holding member 24 with the water meter 26 removed from the unit. However, the present invention is not limited to this, and the check valve 10 can be mounted at an arbitrary position without removing the water meter 26 by using, for example, a joint for fitting a check valve as described in Patent Document 2. Also good.

  Hereinafter, a more specific configuration of the check valve 10 according to the embodiment of the present invention will be described.

  2A and 2B show the check valve 10 in a closed state and an open state, respectively. 3 (a) is a side view of the check valve 10, FIG. 3 (b) is a side view of the check valve 10 of FIG. 3 (a) when viewed from the right side (downstream side), and FIG. b) is a top view of the check valve 10.

  The check valve 10 includes a main body 12 and a valve body 16 movably provided inside the main body 12. The main body 12 and the valve body 16 are made of a resin material such as polyacetal (POM), for example.

  As can be seen from FIGS. 2A and 2B, the valve body 16 is movable relative to the main body 12, and the inside of the main body 12 differs depending on whether the check valve 10 is open or closed. Located in place. The valve body 16 is configured to be movable along the central axis direction of the shaft member 14 fixed to the main body 12. In the present specification, the central axis of the shaft member 14 will be described as the axis of the reverse heart valve 10.

  A flange-like packing 19 and a valve seat (more specifically, a valve seat packing 18) arranged so as to contact the valve body 16 in the closed state are fixed to the main body 12. The valve seat packing 18 is fixed to the main body 12 by a valve seat packing pressing member 17.

  The main body 12 is provided with three rod-shaped guide members 12a as shown in FIGS. These guide members 12 a are provided outside the valve body 16 with a slight gap therebetween, and limit the moving direction of the valve body 16. As shown in FIG. 3B, the guide members 12a may be evenly arranged with an angle of 120 ° around the axis of the check valve 10, for example.

  A shaft member 14 is fixed inside the main body 12. In the present embodiment, the shaft member 14 is formed integrally with the main body 12. One end of the shaft member 14 is a release end, and a recess 14y surrounded by an outer peripheral wall extending in the circumferential direction is formed at the release end.

  As shown in FIGS. 2A and 2B, a discharge path 14 x communicating with the secondary side pipe is provided inside the shaft member 14 (inside the outer peripheral surface). The discharge path 14x communicates with a recess 14y surrounded by the outer peripheral wall. Further, in the discharge path 14x, the shaft member 14 is provided with a check packing 13 for preventing a backflow.

  The valve body 16 has a recess 16 x on the side opposite to the side in contact with the valve seat packing 18. At least an end portion of the shaft member 14 is disposed inside the recess 16x of the valve body 16. The valve body 16 is configured to be slidable along the axial direction of the shaft member 14 by opening a slight gap (for example, 20 to 100 μm) to cover the outer peripheral surface of the shaft member 14. In addition, the clearance gap between the valve body 16 and the shaft member 14 is designed by the dimension which can flow out of the fluid (specifically water).

  A coil spring (biasing spring) 15 is accommodated in a recess 16x provided on the back side of the valve body 16. More specifically, the coil spring 15 is disposed so as to be expandable and contractable along the axial direction in a space A formed by the recess 16x of the valve body 16 and the recess 14y provided at the end of the shaft member 14. ing. One end of the coil spring 15 is fixed to the valve body 16 at the innermost part of the recess 16x of the valve body 16.

  Even when the check valve 10 is closed as shown in FIG. 2A, the coil spring 15 has a length shorter than the natural length, and presses the valve body 16 against the valve seat packing 18. It is possible to apply an urging force to the valve body 16. As shown in FIG. 2 (b), when the valve is fully opened, the coil spring 15 is most compressed and typically accommodated substantially entirely in the recess 14y at the end of the shaft member 14. Is done.

  In this configuration, in the closed state shown in FIG. 2 (a), the valve body 16 contacts the valve seat packing 18 and the flow path is shut off. In the open state shown in FIG. 2 (b), the valve body 16 and the valve seat The packing 18 is separated and a flow path is opened between them. Further, in the closed state (FIG. 2A), the volume of the space A (the accommodation space for the coil spring 15) surrounded by the valve body 16 and the shaft member 14 is large, whereas the open state (FIG. In b)), the volume of the space A is small.

  Here, the space A and the discharge path 14x provided inside the shaft member 14 communicate with each other. The discharge path 14x includes a plurality of first discharge paths 14x1 provided on the space A side, and a common second discharge path 14x2 communicating with the plurality of discharge paths 14x1. However, the 1st discharge path 14x1 and the 2nd discharge path 14x2 are separated in the aspect in which the distribution | circulation to one direction is possible by the non-return packing 13. FIG. The check packing 13 enables the flow of fluid from the first discharge path 14x1 to the second discharge path 14x2, and prevents backflow from the second discharge path 14x2 to the first discharge path 14x1. To work.

  Hereinafter, the opening / closing operation of the check valve 10 will be described with reference to FIGS. 4A to 4D schematically show the valve body 16, the valve seat packing 18, the shaft member 14, and the check packing 13 of the check valve 10, and FIGS. Other members such as the coil spring 15 shown in b) are omitted.

  As shown in FIG. 4 (a), in the water stop state, no water flows from the primary side to the secondary side. At this time, the check valve 10 is in the closed state, and the valve body 16 is in the valve seat. It is pressed against the packing 18 to block the flow path. A coil spring 15 (see FIG. 2A) provided in the recess of the valve body 16 biases the valve body 16 to the upstream side. In this state, the volume of the space A surrounded by the valve body 16 and the shaft member 14 is maximized. Note that the interior of the space A is usually filled with water.

Next, when the user enters the water supply state by opening the water faucet or the like, as shown in FIG. 4B, the valve body 16 is pushed into the secondary side by the water pressure F1, so that the check is made. The valve 10 is opened, and a water flow f ₀ from the primary side to the secondary side is generated through the check valve 10 (the space between the valve seat packing 18 and the valve body 16). At this time, the valve body 16 moves to the secondary side so as to slide on the outside of the shaft member 14 inside the main body 12, and the innermost part of the recess of the valve body 16 and the end portion of the shaft member 14 The distance between and decreases.

  In this process, the water in the space A flows through the first discharge path 14x1, pushes the flexible check packing 13 to the back side, and flows to the second discharge path 14x2 (water flow f1). Thus, the water in the space A is configured to be relatively easily discharged to the secondary side through the discharge path 14x of the shaft member 14 when the valve is opened. For this reason, the water in the space A hardly disturbs the movement of the valve body 16, and the operation of opening the valve smoothly is performed. In this process, as the valve body 16 moves, the volume of the space A gradually decreases.

  A slight gap is provided between the inner peripheral surface of the valve body 16 and the outer peripheral surface of the shaft member 14, but the discharge path is larger than the cross-sectional area (area in the cross section perpendicular to the axial direction) of the gap. The average cross section of 14x is much larger. For this reason, the water in the space A is discharged to the outside through the discharge path 14x with priority. In this specification, “passing preferentially” means that the flow rate of water passing therethrough is larger.

  FIGS. 5A and 5B are plan views showing an example of a hole forming member (non-return packing presser) 14a and a non-return packing 13 in which the first discharge path 14x1 is formed. As shown in FIG. 5A, four first discharge passages 14x1 may be provided equally around the axis in the hole forming member 14a. Further, the check packing 13 may have a mode in which an X-shaped opening 13x is provided at the center so as to have four valve portions 13a corresponding to the four first discharge paths 14x1. The material and dimensions of the valve portion 13a of the check packing 13 are appropriately selected so that the valve portion 13a is easily flexible with respect to pressure from one direction and is arranged in a planar shape when the pressure is removed. Has been.

  However, it is not restricted to the form demonstrated above, The hole formation member 14a may be provided with 3 or less, or 5 or more discharge paths, for example. In addition, the check packing 13 may have various shapes as long as it has a flexible valve portion that is arranged so as to overlap each discharge path. In addition, the attachment to the shaft member 14 is performed, for example, by first pushing the check packing 13 into a predetermined position from the opening at the end of the shaft member into the space for the discharge path provided in the center of the shaft member 14. The hole forming member 14a is pushed in from above and is fixed to the shaft member 14.

The operation of the check valve 10 will be described again. As shown in FIG. 4 (b), after opening the valve, it is a state in which the valve is opened to maintain maximum when water flow state is maintained by a water f ₀ as shown in FIG. 4 (c) Thus, a large space is formed between the valve seat packing 18 and the valve body 16. At this time, the valve body 16 is in a state in which the shaft member 14 is most inserted (that is, a state in which the distance between the innermost part of the recess of the valve body 16 and the end of the shaft member 14 is minimum), and the valve body 16 The volume of the space A surrounded by the shaft member 14 is also minimized. Note that the urging force of the coil spring 15 (see FIGS. 2A and 2B) is always applied to the valve body 16, but water pressure or the force by which the water flow pushes the valve body 16 is more sufficient than the above urging force. Therefore, the valve body 16 is maintained at the position moved to the primary side as shown in FIG. However, the state shown in FIG. 4C is exemplary, and the check valve 10 is opened to the maximum according to the magnitude of the water pressure F1 and the urging force of the coil spring. Alternatively, the shaft member 14 may be inserted only halfway through the recess of the valve body 16.

In this state in which the flowing water f ₀ is constantly generated and the position of the valve body 16 is maintained, no water flows in the space A. Therefore, the water passing through the discharge path 14 x provided in the shaft member 14 is not generated. There is almost no movement, and the valve portion 13a (see FIG. 5B) of the check packing 13 is positioned so as to block the first discharge passage 14x1 as in the case of water stoppage shown in FIG. 4A. The flow between the first discharge path 14x1 and the second discharge path 14x2 is blocked.

  Thereafter, when the water supply from the primary side to the secondary side is stopped, for example, when the user closes the water tap, as shown in FIG. 4D, the coil spring 15 (FIG. 2A) And the biasing force F2 (see (b)) becomes dominant, and the check valve 10 is closed. In this operation, the valve body 16 moves in the direction of the valve seat packing 18 by the urging force F2.

  At this time, in the space A surrounded by the valve body 16 and the shaft member 14, water flows preferentially through the gap between the valve body 16 and the shaft member 14 instead of the above-described discharge path 14x (water flow f2). ). This is because in the discharge path 14x, the non-return packing 13 functions so as to block the flow path, and therefore there is little (or no) water that can flow into the space A through this flow path. .

  However, since the cross-sectional area of the gap between the valve body 16 and the shaft member 14 is sufficiently small compared to the average cross-sectional area of the drainage channel 14x, the flow rate of water flowing into the space A from the outside (per unit time) Is smaller). For this reason, the valve body 16 moves relatively slowly toward the valve seat packing 18.

  As described above, in the check valve 10 of the present embodiment, the speed of movement of the valve body 16 is suppressed in the process of shifting from the open state to the closed state. Occurrence can be suppressed. This can reduce damage to the piping and prevent the generation of unpleasant sounds. Further, in the process of shifting from the closed state to the open state, the water in the space A is quickly discharged through the discharge path provided in the shaft member, so that the valve can be opened smoothly.

  While the embodiments of the present invention have been described above, various modifications can be made. For example, in the central portion of the hole forming member 14a (FIG. 5A) provided with the first discharge port, a fine position is provided at a position not covered by the valve member 13a (FIG. 5B) of the check packing 13. A through hole may be provided. This through-hole communicates with the space A, and may be used supplementarily to return water to the space A when the valve body 16 that has been in the open state shifts to the closed state.

  A check valve according to an embodiment of the present invention is widely used to prevent backflow in a water meter unit or the like.

DESCRIPTION OF SYMBOLS 1 Water meter unit 10 Check valve 12 Main body 13 Check packing 14 Shaft member 14a Hole formation member 15 Energizing spring 16 Valve body 17 Press 18 Valve seat packing 19 Packing 20 Base 22 Primary side holding member 24 Secondary side holding member 26 Water meter 28 Elbow

Claims (5)

A main body, a valve body movably provided inside the main body, and a valve seat fixed to the main body, and the valve body and the valve seat are in contact with each other in a closed state to block the flow path. A check valve configured to open the flow path by separating the valve body and the valve seat in an open state,
A shaft member fixed to the main body, and a biasing spring connected to the valve body,
The valve body has a recess on the side opposite to the side in contact with the valve seat, and the biasing spring and the end of the shaft member are disposed inside the recess of the valve body,
With discharge passage which communicates with the space surrounded by the end of the shaft member and the front Kiben body inside the shaft member is provided, wherein through the gap between the shaft member and the valve body It is configured so that fluid can flow into the space,
The discharge path includes a first discharge path provided on the space side and a second discharge path communicating with the first discharge path, and the first discharge path and the second discharge path A check valve provided with a check packing for preventing a back flow from the second discharge passage to the first discharge passage between the passage and the passage . The check valve according to claim 1 , wherein a plurality of the first discharge paths are provided, and one second discharge path common to the plurality of first discharge paths is provided. Wherein the shaft member has a through hole communicating with the space not covered by the non-return seal is provided, the check valve according to claim 1 or 2. When transitioning from the open state to the closed state, fluid flows into the space preferentially through the gap between the valve body and the shaft member,
The fluid according to any one of claims 1 to 3 , wherein the fluid in the space is preferentially discharged to the outside through the discharge path when shifting from the closed state to the open state. Check valve. The check valve according to any one of claims 1 to 4 , wherein the main body includes a plurality of rod-shaped guide portions arranged outside the valve body.

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