JP2012163162A - Constant flow valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant flow valve capable of stabilizing flow rate characteristics.SOLUTION: The constant flow valve includes a cylindrical casing 2 in which fluid flows inside from one end side to the another end side, a movable valve body 5 movable along the inside of the casing 2, a groove part 3 recessed with respect to an inner peripheral surface of the casing 2 and extending from one end side to the another end side of the casing 2, a flow rate adjustment flow passage formed between a side edge part of the movable valve body 5 and the groove part 3 facing to the side edge part for passing the fluid supplied from one end side of the casing 2, and an energization means such as a coil spring for giving drag for resisting pressing force acting on the movable valve body 5 by the fluid flowing from one end side of the casing 2 to the movable valve body 5. An opening area of the flow rate adjustment flow passage is made so that flow rate of the fluid flowing in the flow rate adjustment flow passage can be a constant flow rate in response to a position where the pressing force acting on the movable valve body 5 and the drag acting on the movable valve body 5 by the energization means are balanced.

Description

  The present invention relates to a constant flow valve.

  For example, a fluid supply device such as a hot water heater is equipped with a constant flow valve so that tap water can be supplied to the fluid supply device at a constant flow rate even if the supply pressure of tap water varies. In a conventional constant flow valve, a valve body made of a coiled spring and a guide shaft for guiding the valve body are installed in a fluid flow path (see, for example, Patent Document 1). Then, the valve body expands and contracts with the fluid pressure fluctuation along the guide shaft, so that the gap between the windings of the coiled spring fluctuates, and the fluid passing through the gap has a constant flow rate. ing.

JP-A-6-235470

  However, in the conventional constant flow valve, since the flow rate of the liquid is set to a desired flow rate by controlling the gap between the windings of the coiled spring, the predetermined flow rate is set with high accuracy. There was a problem that it was difficult to pass.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a constant flow valve capable of stabilizing flow characteristics.

  The invention according to the present invention is made in order to solve the above-mentioned problems, and is a constant flow valve for making the flow rate of a fluid constant, in which the fluid flows from one end side to the other end side. A cylindrical casing that flows through the casing, a movable valve element that is disposed inside the casing and is movable along the inside, and is recessed with respect to the inner peripheral surface of the casing, and is disposed from one end side of the casing to the other. Formed between the groove extending toward the end of the casing, the side edge of the movable valve body, and the groove facing the side edge, and supplied from one end of the casing And a biasing means for imparting a drag force against the pressing force acting on the movable valve body by the fluid flowing from one end side of the casing to the movable valve body. The opening area of the flow rate adjusting flow path is The flow rate adjusting flow path according to the position where the pressing force acting on the movable valve body by the fluid flowing in from one end side of the ring balances the drag acting on the movable valve body by the biasing means This is achieved by a constant flow valve that is set so that the fluid flow rate through

  According to the constant flow valve having such a configuration, the movable valve body is in a position where the pressing force of the fluid flowing from one end side of the casing and the drag acting on the movable valve body by the biasing means are balanced. Accordingly, the fluid flow rate can be made constant by automatically adjusting the opening area of the flow rate adjusting flow path. This constant flow valve does not set the flow rate of the liquid to a desired flow rate by controlling the gap between the windings of the coiled spring as in the prior art. A constant flow rate desired by controlling an opening area of a flow rate adjusting flow path formed between a portion and a groove facing the side edge and through which a fluid supplied from one end side of the casing passes. Therefore, it is possible to pass a predetermined flow rate with high accuracy.

  In the constant flow valve according to the present invention, the movable valve body is configured to have magnetism, and the urging means is a fixed valve having magnetism disposed on the other end side of the casing. A body is provided, and by the action of the repulsive force of the magnetic force, a drag force against the pressing force acting on the movable valve body by the fluid flowing from one end side of the casing is applied to the movable valve body. preferable.

  Although a coiled spring can be used as the biasing means, the coiled spring deteriorates with repeated use, and its elastic coefficient may change, leading to unstable flow characteristics. As described above, the urging means is configured to include a fixed valve body having magnetism disposed on the other end side of the casing, and the movable valve body is configured to have magnetism. With the action of the repulsive force, the structure that gives the movable valve body a resistance against the pressing force acting on the movable valve body by the fluid flowing in from one end side of the casing has an extremely simple structure. Thus, it is possible to obtain a highly accurate constant flow valve that can effectively prevent the flow characteristics from becoming unstable.

  Moreover, it is preferable that at least one of the fixed valve body and the movable valve body includes a permanent magnet and a covering body that covers the permanent magnet.

  Moreover, it is preferable that at least one of the fixed valve body and the movable valve body includes an electromagnet capable of adjusting a magnetic force.

  By adopting such a configuration, by appropriately changing the magnetic force of the fixed valve body and / or the movable valve body, a pressing force acting on the movable valve body by the fluid flowing from one end side of the casing, It is possible to change the position of the movable valve body where the repulsive force acting on the movable valve body is balanced by the magnetic force generated between the fixed valve body and the movable valve body. As a result, the flow rate flowing out from the constant flow valve can be changed to a desired flow rate.

  The biasing means is preferably a coil spring. When a coiled spring is employed as the biasing means, by appropriately setting the elastic coefficient of the coiled spring, the pressing force acting on the movable valve body by the fluid flowing from one end side of the casing, and the coiled spring The position where the drag acting on the movable valve body is balanced by the spring can be easily adjusted, and a highly accurate constant flow valve can be easily obtained.

  Moreover, it is preferable that the said movable valve body is comprised so that sliding contact with the internal peripheral surface of the said casing is possible.

  By adopting such a configuration, it is possible to form a flow rate adjusting passage through which the fluid supplied from one end side of the casing passes only between the groove portion and the side edge portion of the movable valve body. Therefore, it is possible to control the opening area of the flow rate adjusting flow path simply by setting the shape of the groove, and a constant flow valve that supplies a desired flow rate can be easily obtained.

  Moreover, it is preferable that a gap is formed between the movable valve body and the inner peripheral surface of the casing.

  By adopting such a configuration, it is possible to prevent friction between the side edge portion of the movable valve body and the inner peripheral surface of the casing. As a result, the movable valve body can move smoothly with respect to fluctuations in the supply pressure of the fluid, and the flow rate characteristics of the constant flow valve can be further stabilized. Moreover, it is possible to prevent abnormal noise from being generated due to friction between the movable valve body and the inner peripheral surface of the casing.

  The hydraulic pressure release recess is recessed with respect to the inner peripheral surface of the casing and connected to one end of the groove on the other end side of the casing, and the length of the hydraulic pressure release recess in the circumferential direction of the casing. The length of the hydraulic pressure release recess in the axial direction of the casing is set to be greater than the length of one end of the groove in the circumferential direction. It is preferable to be formed so as to be larger than the length.

  The pressure inside the casing on the upstream side of the movable valve body becomes higher than expected, and the movable valve body moves to the fixed valve body side beyond one end of the groove on the other end side of the casing. Even if it is closed, a fluid is formed between the movable valve body and the fixed valve body via the water pressure release recess by providing a water pressure release recess connected to one end of the groove on the other end side of the casing. It is possible to reduce the pressure inside the casing on the upstream side of the movable valve body by guiding to the space. This can effectively prevent the constant flow valve from being damaged.

  In addition, it is preferable to further include a posture maintaining member having a ring-shaped member whose outer peripheral surface is in sliding contact with the inner peripheral surface of the casing, and a rod-shaped support member that connects the ring-shaped member and the movable valve body.

  By providing such a posture maintaining member, it is possible to effectively prevent the movable valve body from tilting or rolling inside the casing, and to supply a constant flow rate to the downstream side.

  Moreover, it is preferable that the said groove part is formed so that the groove depth may become shallow toward the other end part side from the one end part side of the said casing. Moreover, it is preferable that the said groove part is formed so that the groove width may become small toward the other edge part side from the one edge part side of the said casing.

  Moreover, it is preferable to provide an outflow path that guides the fluid guided to the space between the movable valve body and the fixed valve body via the flow rate adjusting flow path to the outside of the casing.

  A stopper that restricts movement of the movable valve body by a certain amount or more due to a pressing force of fluid flowing in from one end side of the casing and prevents the movable valve body from blocking the outflow path; It is preferable to further provide.

  By providing such a stopper, even if fluid is supplied to the constant flow valve at a pressure higher than expected, the movable valve body does not block the outflow path, and the constant flow valve may be damaged, It is possible to prevent the upstream apparatus that supplies fluid to the flow valve from being damaged.

  ADVANTAGE OF THE INVENTION According to this invention, the constant flow valve which can stabilize a flow volume characteristic can be provided.

It is a schematic structure sectional view of the constant flow valve concerning this embodiment. It is AA sectional drawing of the constant flow valve shown in FIG. It is explanatory drawing explaining the action | operation of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. (A) is schematic structure sectional drawing which shows the modification of the constant flow valve shown in FIG. 1, (b) is the BB sectional drawing. (A) is schematic structure sectional drawing which shows the modification of the constant flow valve shown in FIG. 9, (b) is CC sectional drawing of (a). It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG. It is a schematic structure sectional view showing a modification of the constant flow valve shown in FIG.

  Hereinafter, an embodiment of a constant flow valve according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a constant flow valve 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. Each drawing is partially enlarged or reduced to facilitate understanding of the configuration, not the actual size ratio.

  The constant flow valve 1 according to the present invention supplies a fluid typified by water to a fluid supply device such as a hot water heater or a water purifier disposed downstream at a constant flow rate regardless of fluctuations in supply pressure. It is a valve apparatus for. As shown in FIGS. 1 and 2, the constant flow valve 1 includes a casing 2, a groove portion 3 formed in the casing 2, an urging means 4, a movable valve body 5, and a flow rate adjusting flow path 6. I have.

  The casing 2 is a cylindrical member in which a fluid flows from one end side to the other end side, and has a bottomed cylindrical shape with one end opening. The casing 2 is formed of a metal such as stainless steel or brass, or a synthetic resin such as ABS resin or PBT resin. Moreover, the outer peripheral shape and inner peripheral shape of the casing 2 are both configured to be circular. In addition, the outer peripheral shape and inner peripheral shape of the casing 2 can adopt various shapes such as a rectangular shape and a hexagonal shape in addition to a circular shape.

  A flange portion 21 projecting outward from the outer peripheral surface of the casing 2 is formed at the opening peripheral edge at one end of the casing 2, and a mounting member 7 such as a nut is provided so as to cover the periphery of the flange portion 21. is set up. The attachment member 7 is rotatable with respect to the flange portion 21, and the attachment member 7 is prevented from coming out of the casing 2 by engagement with the flange portion 21. A ring-shaped retaining member 23 for preventing the movable valve body 5 from slipping out of the casing 2 is provided on the inner peripheral surface of the opening at one end of the casing 2. A discharge hole 22 for discharging the fluid supplied to the inside of the casing 2 to the outside is formed in the bottom center of the casing 2. A screw part for connecting to a pipe line such as a pipe is formed on the outer peripheral surface in the vicinity of the bottom of the casing 2.

  The groove 3 formed in the casing 2 is configured by forming a recess in the inner peripheral surface of the casing 2. In the present embodiment, as shown in FIG. 2, the four groove portions 3 are provided at substantially equal intervals along the circumferential direction of the inner peripheral surface of the casing 2, but the number of the groove portions 3 is not particularly limited. The groove 3 is formed to extend from one end side (opening end side) of the casing 2 toward the other end side (bottom side). Moreover, the groove part 3 is formed so that the groove width may become smaller from one end part side of the casing 2 toward the other end part side.

  The biasing means is a means for imparting a drag force against the pressing force acting on the movable valve body 5 by the fluid flowing from one end side of the casing 2 to the movable valve body 5, and the other end portion of the casing 2. A fixed valve body 4a having magnetism disposed on the side is provided. This fixed valve body 4a is a disk-shaped member having magnetism disposed at the bottom of the casing 2 (the other end of the casing 2), and is constituted by, for example, a permanent magnet and a covering that covers the permanent magnet. Has been. The covering is preferably formed of a synthetic resin material. The fixed valve body 4a may be formed of a magnet alone or a synthetic resin material provided with a magnet outside.

  An outflow hole 41 penetrating from the upper surface side to the lower surface side of the fixed valve body 4a is formed at the center of the fixed valve body 4a. The outflow hole 41 is formed at the axis of the outflow hole 41 and at the bottom of the casing 2. The fixed valve body 4 a is fixed to the bottom portion of the casing 2 so that the axis of the discharge hole 22 substantially coincides. The communication space formed by the outflow hole 41 formed in the fixed valve body 4a and the discharge hole 22 formed in the bottom of the casing 2 allows the fluid guided into the casing 2 to flow out of the casing 2. Configure the road.

  The movable valve body 5 has substantially the same configuration as that of the fixed valve body 4a, and is a disk-shaped member having magnetism. For example, the movable valve body 5 includes a permanent magnet and a covering body that covers the permanent magnet. . The covering is preferably formed of a synthetic resin material. In addition, you may form the movable valve body 5 with a synthetic resin material etc. which provide a magnet single-piece | unit or a magnet outside.

  The movable valve body 5 is arranged inside the casing 2 and is configured to be movable along the inside. More specifically, it is movably disposed in a space formed between the fixed valve body 4 a fixed inside the casing 2 and one end of the casing 2. Further, the movable valve body 5 is arranged so that the fixed valve body 4a and the magnetic poles on the opposed surface side of the movable valve body 5 that are arranged opposite to each other have the same polarity (the opposed surface side of the fixed valve body 4a and the movable valve body 5). Are arranged in the casing 2 so that the movable valve body 5 is repelled against the fixed valve body 4a by the action of magnetic force. Yes. The movable valve body 5 is formed in a shape and size that allows the outer peripheral surface (side edge portion) to move in sliding contact with the inner peripheral surface of the casing 2.

  The flow rate adjusting flow path 6 is formed between the side edge portion of the movable valve body 5 and the groove portion 3 facing the side edge portion, and is formed between the movable valve body 5 in the casing 2. Two spaces (the space formed between one end of the casing 2 and the movable valve body 5 and the space formed between the movable valve body 5 and the fixed valve body 4a) communicate with each other. This is a flow path through which the fluid supplied from one end side of the casing 2 passes. More specifically, the space formed by the side edge portion of the movable valve body 5 and the both side surface portions and the bottom surface portion of the groove portion 3 facing the side edge portion constitutes the flow rate adjusting flow path 6. The opening area of the flow rate adjusting flow path 6 is formed so that the groove width of the groove portion 3 decreases from one end side of the casing 2 toward the other end side. It is comprised so that it may become small as it moves from the one edge part side of 2 to the other edge part side.

  The opening area of the flow rate adjusting flow path 6 formed by the movable valve body 5 and the groove 3 is such that the pressing force acting on the movable valve body 5 by the fluid flowing from one end side of the casing 2 and the fixed valve body 4a. The flow rate of the fluid flowing through the flow rate adjusting flow path 6 becomes a desired constant flow rate according to the position where the repulsive force (drag) acting on the movable valve body 5 is balanced by the magnetic force generated between the movable valve bodies 5. Is set. The opening area of the flow path can be set by changing the groove width and depth of the groove part 3 and the number of the groove parts 3.

  Hereinafter, the operation of the constant flow valve 1 according to the present embodiment will be described. First, as shown in FIG. 3A, a fluid such as tap water supplied to the constant flow valve 1 flows into the inside through an opening on one end side of the casing 2. The fluid flowing into the casing 2 presses the movable valve body 5 by its supply pressure. The movable valve body 5 pressed by the fluid moves toward the other end side of the casing 2, and the movable valve body 5 has a fluid magnetic force due to the magnetic force of the magnet of the fixed valve body 4 a. Since a repulsive force (drag) opposite to the pressing direction acts, the movable valve body 5 is disposed at a position where the pressing force and the repulsive force (drag) are balanced (FIG. 3B).

  The fluid flowing in from the opening on one end side of the casing 2 passes through a flow rate adjusting flow path 6 formed by the side edge portion of the movable valve body 5 and the groove portion 3 formed on the inner peripheral surface of the casing 2. Then, the gas flows into the space formed between the movable valve body 5 and the fixed valve body 4a, and then the outlet hole 41 formed in the fixed valve body 4a and the discharge hole 22 formed in the bottom of the casing 2 Will flow out to the outside.

  The opening area of the flow rate adjusting flow path 6 constituted by the side edge portion of the movable valve body 5 and the groove portion 3 is the repulsion of the supply pressure of the fluid supplied to the constant flow valve 1 and the magnetic force acting on the movable valve body 5. In relation to force (drag), the flow rate of the fluid passing through the flow rate adjusting flow path 6 is configured to be constant regardless of the position of the movable valve body 5. Therefore, in the constant flow valve 1 according to the present embodiment, the movable valve body 5 has a repulsive force (repulsive force) generated between the pressing force of the fluid flowing from one end side of the casing 2 and the fixed valve body 4a. ) Automatically adjusts the opening area of the flow rate adjusting channel 6 according to the position where the fluid flow rate is balanced, and the fluid flow rate can be made constant with high accuracy. In addition, since the constant flow valve 1 does not use a coiled spring that causes instability of the flow characteristics, the fluid flow rate is less likely to vary even after repeated use. Can flow out downstream.

  Further, in the constant flow valve 1 according to the present invention, since the movable valve body 5 is configured to be slidably contactable with the inner peripheral surface of the casing 2, the fluid supplied from one end side of the casing 2 passes therethrough. Since the flow rate adjusting flow path 6 can be formed only between the side edge portion of the movable valve body 5 and the groove portion 3 facing the side edge portion, the flow rate adjusting flow channel 6 can be obtained only by setting the shape of the groove portion 3. The opening area of the passage 6 can be controlled, and the constant flow valve 1 that supplies a desired flow rate can be easily obtained.

  In the constant flow valve 1 according to the present invention, in addition to the two parameters such as the width and depth of the groove 3 formed on the inner peripheral surface of the casing 2, the movable valve body 5 and the fixed valve body 4 a having magnetism are used. By appropriately setting the parameter of magnetic force, the pressing force of the fluid flowing from one end side of the casing 2 and the repulsive force (drag) generated in the movable valve body 5 between the fixed valve body 4a are balanced. Since the position of the movable valve body 5 to be changed can be changed, the flow rate of the fluid flowing through the flow rate adjusting flow path 6 can be controlled with higher accuracy, and a constant flow valve through which a desired flow rate passes can be easily obtained. Can be obtained.

  Although one embodiment of the constant flow valve 1 according to the present invention has been described above, the specific configuration of the constant flow valve 1 is not limited to the above embodiment. In the embodiment described above, the groove 3 is formed so that the groove width decreases from one end side of the casing 2 toward the other end side, so that the movable valve body 5 is one of the casings 2. The opening area of the flow rate adjusting flow path 6 is configured to become smaller as it moves from the end side to the other end side, but from one end side of the casing 2 toward the other end side. By configuring the groove portion 3 so that the groove depth gradually decreases, the opening area of the flow rate adjusting flow path 6 may be configured to gradually decrease. Moreover, as shown in FIG. 4, you may comprise the groove part 3 as an aggregate | assembly of the narrow groove 3a from which the length of the direction along the axis line of the casing 2 differs. When such a configuration is minimized, the movable valve body 5 is moved from one end side to the other end side of the casing 2 by variously changing the length of each narrow groove 3a and the depth of each narrow groove 3a. What is necessary is just to comprise so that the opening area of the flow volume adjustment flow path 6 comprised between each narrow groove 3a and a movable valve body may become small as it moves.

  Moreover, in the said embodiment, although the movable valve body 5 is formed in the shape and magnitude | size which the outer peripheral surface (side edge part) can move in sliding contact with the inner peripheral surface of the casing 2, for example, it is movable. The movable valve body 5 may be configured in such a shape and size that a slight gap is formed between the valve body 5 and the inner peripheral surface of the casing 2. By adopting such a configuration, it is possible to prevent friction between the side edge of the movable valve body 5 and the inner peripheral surface of the casing 2, and as a result, the supply pressure of the fluid can be reduced. The movable valve body 5 can move smoothly with respect to fluctuations, and the flow rate characteristics of the constant flow valve 1 can be further stabilized. Further, it is possible to effectively prevent abnormal noise from being generated due to friction between the movable valve body 5 and the inner peripheral surface of the casing 2.

  Moreover, in the said embodiment, as shown in FIG. 5, you may install the ring-shaped stopper 80, for example in the space formed between the movable valve body 5 and the fixed valve body 4a. In FIG. 5, the stopper 80 is arrange | positioned at the upper surface peripheral part of the fixed valve body 4a. By adopting such a configuration, a certain amount or more of movement of the movable valve body 5 due to the pressing force of the fluid flowing from one end side of the casing 2 is restricted, and the movable valve body 5 blocks the outflow path. It is possible to prevent this. That is, even if fluid is supplied to the constant flow valve 1 at a pressure higher than expected, the movable valve body 5 does not block the outflow path, and the constant flow valve 1 is damaged, It is possible to prevent the upstream apparatus supplying the fluid from being damaged. The shape of the stopper 80 is not particularly limited as long as it can achieve the purpose of restricting a certain amount of movement of the movable valve body 5. For example, instead of adopting the ring-shaped stopper 80, the casing 2 The stopper 80 may be composed of a plurality of protrusions protruding from the inner peripheral surface of the stopper.

  Further, as shown in FIG. 6, a posture maintaining member having a ring-shaped member 85 whose outer peripheral surface is in sliding contact with the inner peripheral surface of the casing 2 and a rod-shaped support member 86 that connects the ring-shaped member 85 and the movable valve body 5. 87 may be further provided. By providing such a posture maintaining member 87, it is possible to effectively prevent the movable valve body 5 from tilting or rolling inside the casing 2, and to supply a constant flow rate to the downstream side. It becomes possible. In addition, this attitude | position maintenance member 87 may be arrange | positioned to the lower surface side (surface side which opposes the fixed valve body 4a) of the movable valve body 5 as shown in FIG. Although it may be arranged on the surface side facing the one end portion of the casing 2, when it is arranged on the lower surface side of the movable valve body 5 (surface side facing the fixed valve body 4 a), the posture maintaining member 87 is more preferable because it can also perform the function of the stopper 80 described above.

  Moreover, in the said embodiment, as shown in FIG. 7, it is recessed with respect to the internal peripheral surface of the casing 2, and is provided with the water pressure release recessed part 88 connected to the one end part 31 of the groove part 3 in the other edge part side of the casing 2. It may be configured. The water pressure release recess 88 is formed such that the length of the water pressure release recess 88 in the circumferential direction of the casing 2 is greater than the length of the one end 31 of the groove 3 in the circumferential direction of the casing 2. The hydraulic pressure release recess 88 in the axial direction is formed so that the length of the hydraulic pressure releasing recess 88 is larger than the length of the movable valve body 5 in the axial direction of the casing 2. Further, the depth of the water pressure release recess 88 is formed to be greater than the groove depth at the one end 31 of the groove 3 in the circumferential direction of the casing 2. That is, the opening area of the opening between the recesses formed between the side edge of the movable valve body 5 and the hydraulic pressure release recess 88 facing the side edge is the side edge of the movable valve body 5 and It is formed to be larger than the opening area of the flow rate adjusting flow path 6 formed between the one end portions of the groove portion 3 facing the side edge portion.

  By providing such a water pressure release recess 88, the pressure inside the casing 2 upstream of the movable valve body 5 becomes higher than expected, and the movable valve body 5 is on the other end side of the casing 2. Even if it has moved beyond the one end 31 of the groove 3 to the fixed valve body 4a side, it is formed between the movable valve body 5 and the fixed valve body 4a via the water pressure release recess 88. It is possible to guide the fluid to the space and reduce the pressure inside the casing 2 on the upstream side of the movable valve body 5. Thereby, it is possible to effectively prevent the constant flow valve 1 from being damaged.

  In addition, when the configuration including the water pressure release recess 88 is employed, the above-described stopper 80 may be further provided. In this case, as shown in FIG. 8, the stopper 80 has a space portion 89 formed between the movable valve body 5 and the fixed valve body 4a when the movable valve body 5 comes into contact with the stopper 80. In addition, it is preferably arranged so that a part of the hydraulic pressure release recess 88 is exposed. According to such a configuration, the pressure inside the casing 2 on the upstream side of the movable valve body 5 becomes a high pressure that greatly exceeds the assumption, and the movable valve body 5 has the groove 3 on the other end side of the casing 2. Even if it has moved to the fixed valve body 4 a side beyond the one end portion 31, the fluid in the casing 2 upstream of the movable valve body 5 is guided to the space portion 89 through the water pressure release recess 88. In addition, it can reliably flow out from the outflow channel.

  Moreover, in the said embodiment, although the fixed valve body 4a and the movable valve body 5 employ | adopt the structure provided with a permanent magnet, for example, at least any one of the fixed valve body 4a and the movable valve body 5 is a magnetic force. It is also possible to provide an electromagnet that can be adjusted. By adopting such a configuration, the repulsive force acting on the movable valve body 5 by the magnetic force generated between the fixed valve body 4a and the movable valve body 5 can be set to a desired force. That is, by appropriately changing the magnetic force of the fixed valve body 4a and / or the movable valve body 5, the pressing force acting on the movable valve body 5 by the fluid flowing from one end side of the casing 2, and the fixed valve body 4a And the position of the movable valve body 5 where the repulsive force acting on the movable valve body 5 is balanced by the magnetic force generated between the movable valve bodies 5 can be changed. As a result, the flow rate flowing out from the constant flow valve 1 Can be changed to a desired flow rate. When such a configuration is employed, for example, a flow rate measured by a flow meter (pulse transmission type flow meter, venturi type flow meter, ultrasonic flow meter, etc.) disposed downstream of the constant flow valve 1 according to the present invention. It is preferable to adjust the magnetic force in the electromagnet based on the above and to change the flow rate.

  In addition, when employ | adopting the structure that the fixed valve body 4a is provided with an electromagnet, as shown to Fig.9 (a), the through-hole 90 is provided in the bottom part etc. of the casing 2, and the fixed valve body 4a has. The electromagnet wiring Z1 may be inserted into the through hole 90.

  Moreover, when employ | adopting the structure that the movable valve body 5 is provided with an electromagnet, as shown to Fig.9 (a) (b), it is preferable to comprise so that the guide mechanism 9 may be provided. FIG. 9B is a cross-sectional view taken along the line BB in FIG. The guide mechanism 9 includes a first guide member 91 disposed at an opening at one end of the casing 2, a second guide member 92 disposed between the opening of the casing 2 and the movable valve body 5, and a movable valve. And a protective tube 93 installed on the upper surface of the body 5. The first guide member 91 and the second guide member 92 have the same configuration, and a ring member 94 having an opening in the center and a support for arranging the center of the ring member 94 at the axial position of the casing 2. And a bar 95. The support bar 95 connects the inner peripheral surface of the casing 2 and the outer peripheral surface of the ring member 94. Further, the protective tube 93 is a tube for inserting the wiring Z2 included in the electromagnet into the inside, and has one end so as to stand upright at the center of the upper surface of the movable valve body 5 (a position corresponding to the axial position of the casing 2). Is fixed to the upper surface of the movable valve body 5. The protective tube 93 is configured to be able to be inserted through the opening of the ring member 94 included in the first guide member 91 and the second guide member 92. The electromagnet wiring Z <b> 2 of the movable valve body 5 is connected to an external power supply device through the inside of the protective tube 93, the opening of the second guide member 92, and the opening of the first guide member 91. Moreover, it is preferable from a viewpoint of disconnection prevention that the wiring Z2 is comprised with the curl cord (expandable electric wire) in which at least one part can be expanded-contracted.

  By providing the guide mechanism 9 configured in this way, the movable valve body 5 smoothly moves along the inner peripheral surface of the casing 2 while preventing the wiring Z2 of the electromagnet included in the movable valve body 5 from being disconnected. Can be secured.

  In addition, when adopting a configuration in which the fixed valve body 4a includes an electromagnet, in addition to the guide mechanism 9, a schematic configuration cross-sectional view of FIG. 10 (a) and a CC cross-sectional view thereof (FIG. 10 (b) )), An auxiliary guide mechanism 97 may be provided. The auxiliary guide mechanism 97 includes an auxiliary guide member 98 installed in the discharge hole 22 formed on the bottom surface of the casing 2 and a guide rod 99 installed on the lower surface of the movable valve body. The auxiliary guide member 98 includes an auxiliary ring member 98 a having an opening at the center, and an auxiliary support bar 98 b for arranging the center of the auxiliary ring member 98 a at the center position of the discharge hole 22. The auxiliary support rod 98b connects the inner peripheral surface of the discharge hole 22 and the outer peripheral surface of the auxiliary ring member 98a. The guide rod 99 has one end fixed to the center of the lower surface of the movable valve body 5 and can be inserted through the opening of the auxiliary ring member 98a included in the auxiliary guide member 98. By providing such an auxiliary guide mechanism 97, smooth movement of the movable valve body 5 along the inner peripheral surface of the casing 2 can be further ensured.

  Moreover, in the said embodiment, the outflow hole 41 was formed in the center part of the fixed valve body 4a, and it was guide | induced in the casing 2 by this outflow hole 41 and the discharge hole 22 formed in the bottom part of the casing 2. Although the outflow passage for guiding the fluid to the outside of the casing 2 is configured, the present invention is not particularly limited to such a configuration. For example, as shown in FIG. A discharge hole 22 communicating between the inside and the outside may be formed, and the discharge hole 22 may be used as an outflow path. When the configuration shown in FIG. 11 is adopted, it is preferable to provide a stopper 80 on the inner peripheral surface of the casing 2 at a position above the discharge hole 22.

  Further, as shown in FIG. 12, the fixed valve body 4a having an outer diameter smaller than the inner diameter of the casing 2 is separated from the bottom of the casing 2 via a plurality of rod-shaped fixing members 42 connected to the inner peripheral surface of the casing 2. The first gap 95 formed between the side edge of the fixed valve body 4a and the inner peripheral surface of the casing 2, and the first gap 95 between the lower surface of the fixed valve body 4a and the bottom surface of the casing 2 is installed. Two clearances 96 may be formed, and an outflow path for guiding the fluid guided into the casing 2 by the first clearance 95, the second clearance 96, and the discharge hole 22 to the outside of the casing 2 may be configured. In FIG. 12, the fixing member 42 is disposed so as to connect the inner peripheral surface of the casing 2 and the side edge portion of the fixed valve body 4a, but is not particularly limited to such a configuration, for example, As shown in FIG. 13, you may arrange | position so that the bottom face of the casing 2 and the bottom face of the fixed valve body 4a may be connected.

  Moreover, in the said embodiment, as shown in FIG. 2, although the bottom face of the groove part 3 is comprised so that it may become a flat plane, it is not specifically limited to such a structure, For example, as shown in FIG. In addition, the bottom surface of the groove portion may be a curved surface.

  Moreover, in the said embodiment, although the movable valve body 5 is comprised so that it may have magnetism, and the biasing means 4 is comprised so that it may be provided with the fixed valve body 4a which has magnetism, in such a structure, For example, as shown in FIG. 15, the urging means 4 may be configured to be a coiled spring 4b. The coiled spring 4b is disposed between the bottom surface of the casing 2 and the movable valve body 5, and resists the pressing force acting on the movable valve body by the fluid flowing from one end side of the casing 2. Drag (spring biasing force) is applied to the movable valve element. As described above, even if the urging means 4 is constituted by the coiled spring 4 b, the constant flow valve 1 has the movable valve body 5 that is pressed against the fluid flowing in from one end side of the casing 2 and the coiled shape. According to the position where the spring urging force (drag) acting on the movable valve body 5 is balanced by the action of the spring 4b, the opening area of the flow rate adjusting flow path 6 is automatically adjusted to make the fluid flow rate constant with high accuracy. It becomes possible. When the coil spring 4b is employed as the biasing means 4, the elastic coefficient of the coil spring 4b is appropriately set so that the fluid flowing from one end side of the casing 2 acts on the movable valve body 5. It is possible to easily adjust the position (position of the movable valve element 5) where the pressing force to be applied and the drag acting on the movable valve element 5 by the coiled spring 4b are balanced, and the high-precision constant flow valve 1 can be easily adjusted. To be able to get to.

  Moreover, in the said embodiment, as shown in sectional drawing of FIG. 16, while forming the thin groove-shaped guide rail 25 extended in the direction in alignment with the axis line of the casing 2 in the inner peripheral surface of the casing 2, the movable valve body 5 is provided. However, you may comprise so that the protrusion part 51 which protrudes toward the outward from the side edge part may be provided. Here, the protrusion part 51 is comprised so that it may slidably contact in the groove | channel of a guide rail. The protrusion slides in the groove of the guide rail 25 as the movable valve body 5 moves in the vertical direction. By adopting such a configuration including the guide rail 25 and the protruding portion 51, the movable valve body 5 tilts or rolls within the casing 2 in the same manner as the posture maintaining member 87 described above. This can be effectively prevented. Furthermore, since the protrusion 51 of the movable valve body 5 comes into contact with one end of the guide rail 25, the movement of the movable valve body 5 can be restricted. Therefore, the length of the guide rail is appropriately set. The movable valve body 5 pressed by the fluid flowing in from one end side of the casing 2 can be configured to exhibit an action as a stopper so as not to block the outflow path.

DESCRIPTION OF SYMBOLS 1 Constant flow valve 2 Casing 21 Flange part 22 Discharge hole 3 Groove part 4 Fixed valve body 5 Movable valve body 6 Flow control flow path 80 Stopper 87 Attitude maintenance member 88 Water pressure release recessed part 9 Guide mechanism 91 First guide member 92 Second guide member 93 Protection tube

The invention according to the present invention is made in order to solve the above-mentioned problems, and is a constant flow valve for making the flow rate of a fluid constant, in which the fluid flows from one end side to the other end side. A cylindrical casing that flows through the casing, a movable valve element that is disposed inside the casing and is movable along the inside, and is recessed with respect to the inner peripheral surface of the casing, and is disposed from one end side of the casing to the other. One end of the casing is formed between a groove portion extending so that a cross-sectional area decreases toward the end portion side, a side edge portion of the movable valve body, and the groove portion facing the side edge portion. A flow rate adjusting flow path through which the fluid supplied from the portion side passes and a drag force against the pressing force acting on the movable valve body by the fluid flowing in from one end side of the casing is applied to the movable valve body. Biasing means, and the flow rate adjusting flow path The opening area depends on the position where the pressing force acting on the movable valve body by the fluid flowing from one end side of the casing balances the drag acting on the movable valve body by the biasing means, This is achieved by a constant flow valve that is set so that the flow rate of fluid flowing through the flow rate adjusting flow path is constant.

Claims (13)

A constant flow valve that makes the flow rate of fluid constant,
A cylindrical casing in which fluid flows from one end side to the other end side;
A movable valve element disposed inside the casing and movable along the interior;
A groove that is recessed with respect to the inner peripheral surface of the casing and extends from one end side of the casing toward the other end side; and
A flow rate adjusting passage formed between a side edge portion of the movable valve body and the groove portion facing the side edge portion, and through which a fluid supplied from one end side of the casing passes;
Urging means for imparting a drag force against the pressing force acting on the movable valve body by the fluid flowing from one end side of the casing to the movable valve body,
The opening area of the flow rate adjusting flow path balances the pressing force acting on the movable valve body by the fluid flowing from one end side of the casing and the drag force acting on the movable valve body by the biasing means. A constant flow valve that is set so that the flow rate of the fluid flowing through the flow rate adjusting flow path becomes a constant flow rate according to the position to be operated. The movable valve body is configured to have magnetism,
The urging means includes a fixed valve body having magnetism disposed on the other end side of the casing, and fluid that flows in from one end side of the casing by the action of a repulsive force of magnetic force. The constant flow valve according to claim 1, wherein a resistance against a pressing force acting on the movable valve body is applied to the movable valve body.   The constant flow valve according to claim 2, wherein at least one of the fixed valve body and the movable valve body includes a permanent magnet and a covering body that covers the permanent magnet.   The constant flow valve according to claim 2, wherein at least one of the fixed valve body and the movable valve body includes an electromagnet capable of adjusting a magnetic force.   The constant flow valve according to claim 1, wherein the biasing means is a coil spring.   The constant flow valve according to any one of claims 1 to 5, wherein the movable valve body is configured to be slidable in contact with an inner peripheral surface of the casing.   The constant flow valve according to any one of claims 1 to 5, wherein a gap is formed between the movable valve body and an inner peripheral surface of the casing. It is recessed with respect to the inner peripheral surface of the casing, and includes a hydraulic pressure release recess connected to one end of the groove on the other end side of the casing,
The length of the water pressure release recess in the circumferential direction of the casing is formed to be longer than the length of one end of the groove in the circumferential direction,
The constant flow rate according to any one of claims 1 to 7, wherein a length of the water pressure release recess in an axial direction of the casing is formed to be longer than a length of the movable valve body in the axial direction. valve.   The posture maintaining member further comprising: a ring-shaped member whose outer peripheral surface is in sliding contact with the inner peripheral surface of the casing; and a rod-shaped support member that connects the ring-shaped member and the movable valve body. The constant flow valve described in 1.   The constant flow valve according to any one of claims 1 to 9, wherein the groove portion is formed so that the groove depth becomes shallower from one end portion side to the other end portion side of the casing.   The constant flow valve according to any one of claims 1 to 10, wherein the groove portion is formed so that the groove width decreases from one end side to the other end side of the casing.   The flow path according to any one of claims 1 to 11, further comprising an outflow path that guides the fluid guided to the space between the movable valve body and the fixed valve body through the flow rate adjusting passage to the outside of the casing. Constant flow valve.   The movable valve body further includes a stopper that restricts movement of the movable valve body by a certain amount due to the pressing force of the fluid flowing in from one end side of the casing and prevents the movable valve body from blocking the outflow passage. The constant flow valve according to claim 12.

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