JP2007139057A - Flow control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow control valve having multiple functions including a flow control function and a back-flow preventing function for accurately and easily controlling a flow amount in a stepwise manner. <P>SOLUTION: The flow control valve comprises: a casing which has a water hole formed in a partition wall internally parting a primary chamber from a secondary chamber on the upper side thereof and opened in the vertical direction and which has a shaft hole passing through the secondary chamber side on the center axis of the water hole; a valve seat provided on the secondary chamber side of the partition wall in communication with the water hole and a valve hole; a valve element whose front end to be seated on the valve seat is formed in a conical shape with its diameter gradually shrunk toward the gravity, and whose front-end conical face can be partially seated on the valve seat with its dead weight and isolated from the valve element in the vertical direction by forward water pressure only when operating via the water hole, to open the valve; and an opening adjusting plug rod provided in the shaft hole of the casing in an up-and-down movable manner for adjusting an isolation distance from the valve seat of the valve element against the forward water pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flow rate adjustment valve capable of adjusting water flow rate to a secondary side and setting water saving, and relates to a structure capable of preventing backflow.

  In general, the flow rate adjustment valve adjusts the valve hole opening of the valve seat by axially moving the valve body in a direction away from the valve seat, thereby adjusting the amount of water flow to the secondary side. There are various structures as specific means (for example, see Patent Documents 1 to 4).

JP-A-10-212905 Japanese Patent Laid-Open No. 11-94097 JP 2002-115763 A JP 2002-286159 A

  The flow rate adjusting valves disclosed in Patent Documents 1 to 4 listed above all adjust the flow rate, and do not have a backflow prevention function when the water is stopped or backflowed. Accordingly, in the piping circuit in which the flow rate adjusting valve is installed, a backflow prevention valve (sometimes simply referred to as a “check valve”) needs to be separately arranged to prevent backflow, which complicates the circuit configuration. . Further, in the four flow rate adjusting valves, the seating side tip with respect to the valve seat of the valve body is formed in an arc shape. For this reason, the moving distance of the valve body and the valve hole opening (which is technically synonymous with the flow rate) have a nonlinear correlation. In other words, when a valve body with an arcuate tip is adopted, the valve hole opening is finely adjusted for a certain distance from the seating, depending on the curvature, but the valve body is moved beyond the certain distance. Then, the opening of the valve hole increases rapidly. Therefore, when the flow rate is adjusted in several stages, there is a problem that it is difficult to adjust each stage.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a multi-function with a backflow prevention function in addition to a flow rate adjustment function, and a flow rate at which stepwise flow rate adjustment can be performed accurately and easily. It is to provide a regulating valve.

  In order to achieve the above-described object, in the present invention, a water passage hole that opens in the vertical direction is formed in a partition wall that internally defines the upper side of the primary chamber as a secondary chamber, and two on the central axis of the water passage hole. A casing formed by penetrating a shaft hole on the side of the secondary chamber, a valve seat provided on the secondary chamber side of the partition wall by communicating the water passage hole and the valve hole, and a seating-side tip portion on the valve seat Is formed into a conical shape whose diameter is gradually reduced in the gravitational direction, and a part of the conical surface of the tip can be seated on the valve seat by its own weight, while forward water pressure is passed through the water passage hole. The valve body that can be opened by being separated from the valve body in the vertical direction by the water pressure only when acted on, and the valve body is provided in the shaft hole of the casing so as to be movable up and down and resists the forward water pressure. A means for configuring a flow rate adjustment valve from an opening adjustment plug rod that can adjust the separation distance from the valve seat It had.

  According to the above means, when the forward water flow from the primary side to the secondary side is performed, the valve is opened by the water pressure. The valve body immediately drops in the seating direction and automatically closes. At the same time, the flow rate adjusting function is exhibited by forming the tip of the valve body in a conical shape and regulating the separation position of the valve body by the opening adjustment plug rod. In other words, in a valve body having a conical tip portion, the opening degree of the valve hole is adjusted according to the depth of penetration of the tip portion with respect to the valve hole, and the flow rate is also adjusted corresponding to the opening degree. Here, the depth of penetration of the valve body tip portion with respect to the valve hole is technically synonymous with the separation position of the valve body. That is, if the separation position of the valve body is high, the depth of entry at the tip end portion becomes shallow, and the opening degree of the valve hole increases. In the present invention, the upper limit of the separation position of the valve body can be set by moving the opening adjustment plug rod up and down. Furthermore, in the present invention, since the tip of the valve body is formed in a conical shape, the depth of penetration with respect to the valve hole, that is, the separation position of the valve body set as the upper limit by the opening adjustment plug rod, and the opening of the valve hole The degree, that is, the flow rate has a linear correlation.

  Further, in the present invention, since the opening adjustment plug bar can be moved up and down starting from the fully closed position where the valve body is seated on the valve seat, the valve element can be operated by setting the opening adjustment plug bar to the lowest position. There is no room to separate from the valve seat, and the water-stopping function is exhibited by maintaining the forced seated state.

  As a specific structure for vertically moving the opening adjustment plug bar, it is preferable that the opening adjustment plug bar is screwed into the shaft hole of the casing and the rotary handle is detachably coupled to the opening adjustment plug bar. The screwing structure prevents inadvertent vertical movement even when water pressure acts on the opening adjustment plug bar, and easily turns the rotation movement into the vertical movement of the opening adjustment plug bar using the rotary handle. Because it can. Further, by making the rotary handle separable, if the rotary handle is removed, tampering by an unauthorized person is prevented and the installation space is not compressed.

  Further, since the opening adjustment plug bar and the rotary handle are detachably coupled by key coupling, flow rate adjustment and water stop work can be performed only by the corresponding key rotary handle, which is preferable in terms of water management.

  Furthermore, it is preferable to provide an opening degree display unit corresponding to the rotation angle of the rotary handle in the casing, so that the opening degree can be adjusted accurately and easily.

  In addition, by providing a buffer at the tip of the secondary chamber of the opening adjustment plug rod, an impact sound (water hammer) to the opening adjustment plug rod of the valve element is produced when switching from water stoppage to water flow or when the water pressure pulsates. This is preferable because it can be prevented.

  Furthermore, it is preferable that the valve body is made of metal such as stainless steel because wear of the valve body is reduced. Moreover, since specific gravity becomes larger than water (hot water), the seating by a dead weight becomes possible and check response property can be improved.

  Furthermore, by integrally providing a ball-type water stop cock capable of stopping the water passage hole in the primary chamber of the casing, water is reliably stopped on the primary chamber side without using the opening adjustment plug rod, With the water stop function, it is possible to perform maintenance on the secondary side, such as exchanging the valve body and valve seat in the secondary chamber, which is more preferable.

  As described above, according to the present invention, it is possible to provide a multifunctional flow rate adjusting valve that also exhibits a backflow prevention function in addition to the basic function of flow rate adjustment. Further, since the seat-side tip of the valve body has a conical shape, the vertical movement of the opening adjustment plug rod and the flow rate adjustment have linearity, and the flow rate adjustment can be performed accurately and easily. In addition, since the opening adjustment plug bar is moved up and down by the rotary handle, the flow rate can be adjusted by familiar operations, and the rotary handle is connected to the opening adjustment plug bar by key connection, so illegal flow adjustment and water stop work It is possible to provide security for water supply management. At the same time, since the opening degree display unit is provided, the desired flow rate can be adjusted accurately. Moreover, a water hammer can be prevented by providing a buffer part in the opening adjustment plug rod, and durability is improved by making the valve body made of metal. Furthermore, since the ball-type water stop cock is integrated, the maintenance of the secondary side can be easily performed by the water stop function.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 5 show a flow rate adjusting valve according to a first embodiment of the present invention. FIG. 1 is an overall explanatory diagram, FIG. 2 is an explanatory diagram of water flow when fully opened, and FIG. 3 is when fully opened. 4 is an explanatory diagram of water flow when water saving is set, and FIG. 5 is an explanatory diagram when forced water is stopped.

  In these drawings, reference numeral 10 denotes a casing. In this embodiment, a two-part structure of a lower structure 11 and an upper structure 12 is used. Then, the upper structure 12 is formed by screwing the lower end male screw portion 12a into the female screw portion 11c formed at the lower end of the mounting hole 11a via the O-ring 11b in the mounting hole 11a formed on the upper surface of the lower structure 11. It is assembled so that it can be disassembled.

  The lower structure 11 is provided with a joint portion 11d such as a cap nut on the primary side and a joint portion 11e such as a male screw on the secondary side. Further, the interior of the lower structure 11 is divided into a primary chamber on the lower side and a secondary chamber on the upper side by an angle-shaped partition wall 11f, and a water passage hole that opens vertically in the horizontal portion of the partition wall 11f. 11 g is formed. Further, 11h is a guide ring that integrally protrudes downward from the mounting hole 11a in the secondary chamber, and stabilizes the separation of the valve body described later. The joint portions 11d and 11e in the lower structure 11 may be other connection structures.

  On the other hand, the upper structure 12 is formed by penetrating a shaft hole 12b in the vertical direction on the central axis of the water passage hole 11g. In the present embodiment, the shaft hole 12b has a three-stage structure having a diameter of small, medium, and large from the top, and a female screw portion 12c is screwed to the intermediate portion.

  Next, 20 is a valve seat. The valve seat 20 is fixed to the secondary side of the partition wall 11f by a fitting ring 22 with the valve hole 21 communicating with the water passage hole 11g in the lower structure 11 of the casing 10.

  Furthermore, 30 is a valve body. The valve body 30 is formed in a conical shape with a diameter gradually reduced in the gravity direction in a seating-side front end portion 31 to the valve seat 20, and the front end portion 31 is inserted into the valve hole 21 and entered. A part of the conical surface can be seated on the valve seat 20. Further, the valve body 30 is stabilized in posture by inserting the rear end portion thereof into the guide ring 11h of the casing 10, and is separated from the valve seat 20 by forward water pressure acting via the water passage hole 11g. The valve is moved vertically to perform the valve opening operation.

  The valve body 30 is preferably made of metal such as stainless steel or ceramic from the viewpoint of durability due to wear reduction or the like. In particular, if the valve body 30 is made of metal, the specific gravity becomes larger than that of water or hot water, so that it can be seated by natural fall due to its own weight.

  Furthermore, in this embodiment, the recessed part 32 is formed in the rear-end surface of the valve body 30, and the weight reduction of the valve body 30 is aimed at. As a result, the valve opening response due to the water pressure is increased, and the pressure receiving surface during the reverse flow is increased by the amount corresponding to the recessed portion 32, so that the check response can be improved at the same time.

  Subsequently, 40 is an opening adjustment plug rod. This opening adjustment plug rod 40 is assembled from below into the shaft hole 12b of the upper structure 12 in a disassembled state, and corresponds to the three-stage configuration of the shaft hole 12b, and is attached with an O-ring 41 from above to provide water tightness. A small shaft portion 42 to be held, a male screw portion 43 to be screwed into the female screw portion 12c of the shaft hole 12b, and a middle shaft portion 44 that allows the opening adjustment plug rod 40 to move up and down along the shaft hole 12b. It consists of a three-stage configuration of a disk portion 45 that engages with the step of the largest diameter portion of the shaft hole 12b and defines the upper limit position of the opening adjustment plug rod 40.

  In the present embodiment, a buffer portion 46 is provided adjacent to the disk portion 45 at the lower end of the secondary chamber of the opening adjustment plug rod 40. The buffer portion 46 is formed by attaching an elastic material such as rubber to the lower end of the opening adjustment plug rod 40 with a screw 48 via a washer 47.

  Further, in the present embodiment, a spline shaft portion 49 formed with a large number of key grooves on the upper end of the opening adjustment plug rod 40 is connected to the small shaft portion 42.

  On the other hand, reference numeral 50 denotes a rotary handle having a knob blade 51, and an insertion hole 53 that can be key-coupled to the spline shaft portion 49 of the opening adjustment plug rod 40 is formed in the shaft rod 52 thereof. According to this structure, the opening adjustment plug rod 40 can be moved up and down by manually rotating the rotary handle 50 key-coupled to the spline shaft portion 49.

  The operation and effect of the flow rate adjusting valve according to the above embodiment will be described in detail with reference to the explanatory views shown in FIGS. 2 to 5. First, as shown in FIG. 2, when the opening adjustment plug rod 40 is turned up to the top. In addition, the buffer part 46 is positioned at the uppermost position together with the disk part 45. Here, the buffer portion 46 attached to the lower end of the opening adjustment plug rod 40 regulates the separation position of the valve body 30 by contacting the rear end portion (upper end portion in the drawing) of the valve body 30. Therefore, in the case of FIG. 2, the longest separation distance of the valve body 30 can be secured. If the separation distance of the valve body 30 becomes long, the penetration depth with respect to the valve hole 21 of the cone-shaped front-end | tip part 31 will become shallow, and the opening degree of the valve hole 21 will also become large. In other words, FIG. 2 shows that as a result of forward water flow from the primary side to the secondary side, the valve body 30 moves to the uppermost position due to the water pressure, and the flow at the time of the fully open setting that allows water flow at the highest flow rate is possible. It shows the water condition. In the present embodiment, a buffer portion 46 is provided at the lower end of the opening adjustment plug rod 40, and the rear end portion of the vertically moving valve body 30 is brought into contact to regulate the separation upper limit position of the valve body 30. Therefore, the impact force at the time of contact is absorbed and relaxed by the buffer portion 46, and the generation of impact sound (water hammer) can be prevented. However, in the present invention, the buffer portion 46 can be omitted, and in this case, the disc portion 45 regulates the separation upper limit position of the valve body 30.

  On the other hand, when water stops or water flows in the reverse direction from the state shown in FIG. 2, the valve body 30 drops due to its own weight or / and the reverse water pressure acting on the secondary side, as shown in FIG. Then, a part of the conical surface of the distal end portion 31 is seated on the valve seat 20 so as to be in close contact with the inner peripheral surface of the valve hole 21 to perform a check action.

  In the flow rate adjustment valve that performs the backflow prevention operation as described above, when the opening adjustment plug rod 40 is turned down, as shown in FIG. 4, the disk portion 45 and the buffer portion 46 are also lower. As a result, the separation upper limit position of the valve body 30 is also lowered. If the separation upper limit position of the valve body 30 is lowered, the depth of penetration of the conical tip 31 into the valve hole 21 is increased, and the opening degree of the valve hole 21 is decreased. That is, if the opening adjustment plug rod 40 is turned down, the flow rate is reduced and a water-saving state can be achieved. Of course, even in this water-saving state, the same non-return action as in the fully open state is performed.

  Then, the opening adjustment plug rod 40 is further turned down, and the valve body 30 is pushed to the seating position by the buffering portion 46 that is displaced downward along with this, so as shown in FIG. Even when the water pressure is acting, the water can be forcibly stopped.

  Thus, in the present embodiment, the opening adjustment plug rod 40 can be moved up and down starting from the fully closed position (forced water stop position) in FIG. 5 where the valve body 30 is seated on the valve seat. Since the seating side tip 31 of the valve body 30 has a conical shape, a linear correlation exists between the separation distance of the valve body 30 due to the vertical movement of the opening adjustment plug rod 40 and the flow rate corresponding to the opening degree of the valve hole 21. It becomes. That is, if the opening adjustment plug rod 40 is moved up and down to increase or decrease the separation distance of the valve body 30, the flow rate increases or decreases linearly with the displacement length.

  FIG. 6 is a correlation graph showing the flow rate change rate (synonymous with the opening degree of the valve hole 21) with respect to the separation distance of the valve body 30, and is expressed as a linear correlation graph as described above. Here, the rate of change of the flow rate also varies depending on the tip angle of the valve body 30. That is, as shown in FIG. 6, when the present embodiment in which the tip angle is set to 120 degrees is used as a reference, the angle is increased to, for example, 150 degrees, and the tip portion 31 has a flattened conical shape. The flow rate change rate is large, and it can be adjusted from fully closed to fully open with a slight separation distance. As the effect, the vertical movement range of the opening adjustment plug rod 40 can be set small, and the casing 10 can be downsized. On the other hand, if the tip angle is reduced to 90 degrees, for example, and the tip 31 has a more conical shape, the rate of change in the flow rate becomes gradual and a large separation distance from fully closed to fully open can be secured. The flow rate can be adjusted. If the tip of the valve body 30 has an arc shape, the rate of change of the flow rate with respect to the separation distance of the valve body is a curved change commensurate with the curvature of the tip as shown by the dotted line in FIG. .

  In this embodiment, since the opening adjustment plug bar 40 is moved up and down by the rotation operation of the rotary handle 50, the vertical displacement length of the opening adjustment plug bar 40 is linear with the rotation angle of the rotary handle 50. Indicated by. That is, by increasing the rotation angle of the rotary handle 50, the vertical displacement length of the opening adjustment plug rod 40 also increases linearly. As a result, the rotation angle of the rotary handle 50 and the flow rate also have a linear correlation. In other words, the flow rate can be adjusted by adjusting the rotation angle of the rotary handle 50. Therefore, if the rotation angle of the rotary handle 50 is known, the flow rate at that time can also be known. Based on this, in this embodiment, the pitch of the male threaded portion 43 of the opening adjustment plug bar 40 and the female threaded portion 12c of the shaft hole 12 is set so that when the rotary handle 50 is rotated once, it is fully closed to fully opened. As shown in FIG. 7, the opening structure display portion 60 corresponding to the rotation angle of the rotary handle 50 is provided on the upper structure 12 of the casing 10 as a percentage mark such as “100, 75, 50, 25”. . In addition, the specific marking method of the opening degree display unit 60 is a fractional marking such as “1/1, 3/4, 1/2, 1/4”, an English notation such as “FULL, HALF, QUATER, CLOSE”, or Other notation methods such as Japanese notation such as “fully open, half open, half open, fully closed” may be used.

  FIG. 8 shows a flow regulating valve according to the second embodiment of the present invention, and the same reference numerals are used for members common to the first embodiment to clarify the structure. A feature of the flow rate adjustment valve according to the second embodiment is that a ball-type water stop cock 60 is integrally provided in the primary chamber of the casing 10, and the valve body 30 and the opening adjustment plug rod 40 in the secondary chamber are provided. The structure of the above and the like, and further, the opening adjustment plug rod 40 is moved up and down by a rotary handle 50 that can be key-coupled, etc. are exactly the same as in the first embodiment.

  In this second embodiment, the ball-type stop cock 70 accommodates a ball valve body 72 having an L-shaped water passage 71 formed therein in a secondary chamber in the lower structure 11 of the casing 10 so as to be rotatable. Yes. The ball valve body 72 is rotated by a lever or the like (not shown). The L-shaped passage 71 is open at both ends of the L-shaped passage 71 at the same time as the water passage 21 and the primary passage. It is possible to switch between the primary passage and the connecting position. In addition, 73 is a valve seat which supports the ball valve body 72 so that rotation is possible.

  According to the flow control valve according to the second embodiment, in addition to exhibiting the same check function, flow control function, and forced water stop function as those in the first embodiment, the ball-type water stop valve 70 provides a primary chamber. Since the water can be stopped in the secondary chamber, it is not necessary to stop the water separately on the upstream side, and maintenance of the secondary chamber can be performed, such as replacing the valve body 30, valve seat 22, opening adjustment plug rod 40, etc. provided in the secondary chamber. It can be done easily.

Whole explanatory drawing of the flow regulating valve concerning a first embodiment of the present invention. Same as above, illustration of water flow when fully open Same as above, backflow prevention diagram when fully open Same as above, water flow illustration when saving water The same figure when forced water stop Same as above, correlation graph showing the rate of change of flow rate with respect to the separation distance of the valve body Same as above, plan view of the upper structure of the casing showing the opening indicator Whole explanatory drawing of the flow regulating valve concerning a second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Casing 20 Valve seat 21 Valve hole 30 Valve body 31 Conical tip part 40 Opening adjustment plug rod 46 Buffer part 50 Rotating handle 60 Opening display part 70 Ball-type stopcock

Claims (8)

A water passage hole opening in the vertical direction is formed in a partition wall that vertically divides the interior into a primary chamber and a secondary chamber, and a shaft hole is formed through the secondary chamber side on the central axis of the water passage hole. A casing, a valve seat provided on the secondary chamber side of the water passage hole, and a seating-side tip on the valve seat are formed in a conical shape whose diameter is gradually reduced in the direction of gravity, and the tip is caused by its own weight. A part of the conical surface of the valve body can be seated on the valve seat, and the valve body can be opened by being separated from the valve seat by forward water pressure, and the shaft hole of the casing can be moved up and down. A flow rate adjusting valve comprising an opening adjusting plug rod capable of adjusting a distance from the valve seat of the valve body. The flow rate adjusting valve according to claim 1, wherein the opening adjusting plug rod is movable up and down starting from a fully closed position where the valve element is seated on the valve seat. The flow rate adjustment valve according to claim 1 or 2, wherein the opening adjustment plug rod is screwed into the shaft hole of the casing and the rotary handle is separable. 4. The flow rate adjusting valve according to claim 3, wherein the opening degree adjusting plug rod has a rotary handle separable by key connection. The flow rate adjusting valve according to claim 3 or 4, wherein an opening degree display portion corresponding to a rotation angle of the rotary handle is provided on the casing. The flow rate adjusting valve according to any one of claims 1 to 5, wherein a buffer portion is provided at a tip of the secondary chamber of the opening adjustment plug rod. The flow regulating valve according to any one of claims 1 to 6, wherein the valve body is made of metal. The flow control valve according to any one of claims 1 to 7, wherein a ball-type water stop cock capable of stopping a water passage hole is integrally provided in a primary chamber of the casing.

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