JP2010193805A - Screw-type flow amount adjuster, and dripper for drip watering - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw-type flow amount adjuster the structure of which is simplified so as to be reduced in production cost. <P>SOLUTION: The screw-type flow amount adjuster is structured as follows: making a tapered hole whose cross-sectional surface shape is circular, and which opens outward and has a diameter gradually increased toward the side of an opening 47, in the body 46 of a dripper for drip-watering as a kind of a flow amount adjuster; and screwing the male screw part 60 of an adjustment screw 36 into the body 46 to form a screw groove via elastic deformation and plastic deformation of the inner peripheral part of the body 46. Such structure results in forming a spiral path 70 owing to the inner peripheral surface 50 of the tapered hole and the screw groove 68 of the male screw part 60. Adjustment of the screwing amount of the male screw part 60 into the tapered hole results in adjusting the watering amount while the water passes through the spiral path 70 and is discharged through the opening 47 in a liquid droplet state. The flow amount adjuster may be made part of a screw-type flow amount adjusting valve. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flow rate regulator that regulates the flow rate of a fluid such as liquid or gas, and a dripper for drip irrigation.

  It has been widely practiced to adjust the flow rate of fluid by providing a portion having a small channel cross-sectional area in the fluid passage and adjusting the channel cross-sectional area. As an example, as described in Patent Document 1 and Patent Document 2, it is used when drip irrigation is performed by installing a irrigation tube in an area where plants are cultivated, such as orchards, vegetable gardens, and flower beds. There is a dripper to be used. In the irrigation tube, irrigation holes are formed at a plurality of locations separated in the longitudinal direction of the irrigation tube, and irrigation is performed with water flowing out from these irrigation holes (including water containing liquid fertilizer, disinfectant, etc.). In many cases, it is desirable to cause the irrigation holes to be provided with a flow regulator called a dripper. Drippers are usually considered to provide resistance to the flow of water by forming a labyrinth, but the manufacture of drippers with complex labyrinths requires a mold, which contributes to increased manufacturing costs. It was. Further, it has been difficult to adjust the flow rate of the conventional dripper.

Japanese Patent No. 3787628 JP 2006-197871 A

  The present invention has been made as a direct problem to provide a dripper suitable for performing drip irrigation under the above circumstances, but the completed invention is widely applied to fluid flow regulators. It became possible.

  The present invention includes a perforated member having a circular cross-sectional shape and formed with a circular hole that opens outward, and a male screw member having a male screw portion having an outer diameter larger than the inner diameter of the circular hole. The male thread portion of the member is inserted into the circular hole from the opening side, and by adjusting the amount of insertion, the flow path of the spiral passage which is a spiral fluid passage formed by the inner peripheral surface of the circular hole and the thread groove of the male screw member A threaded flow regulator with adjustable resistance is obtained.

When the male screw portion of the male screw member is inserted into the circular hole of the perforated member, a spiral fluid passage is formed between the outer peripheral surface of the male screw portion and the inner peripheral surface of the circular hole. This spiral passage functions as a kind of labyrinth, and at least the length of the spiral passage can be changed by changing the insertion amount of the male screw portion into the circular hole, thereby adjusting the flow resistance. Here, “at least” means that not only the length but also the channel cross-sectional area may be changed. If at least one of the male threaded portion and the circular hole is a tapered threaded portion or tapered hole whose outer diameter or inner diameter gradually changes in the axial direction, the length of the spiral passage increases as the insertion amount of the male threaded portion into the circular hole increases. As the value increases, the minimum value of the channel cross-sectional area decreases.
Note that the fluid may flow through at least a part of the spiral passage, and it is not indispensable to flow through the entire spiral passage. If the intersecting passage is communicated in the middle of the spiral passage, the fluid flows through only a part of the spiral passage.
In any case, the flow rate regulator according to the present invention has a very simple configuration and is easy to manufacture, and therefore can be manufactured at low cost.

Aspects of the Invention

  In the following, the invention that is claimed to be claimable in the present application (hereinafter referred to as “claimable invention”. The claimable invention is at least the “present invention” to the invention described in the claims. Some aspects of the present invention, including subordinate concept inventions of the present invention, superordinate concepts of the present invention, or inventions of different concepts) will be illustrated and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, the prior art, and the like. The added aspect and the aspect in which the constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

  In each of the following items, item (1) corresponds to claim 1, item (2) and item (3) combined correspond to item 2, and item (5) corresponds to item 3. (8) is claim 4, (9) is claim 5, (10) to (12) is combined with claim 6, (13) is claim 7 , Respectively.

(1) a male member including a perforated member having a circular cross-sectional shape and formed with a circular hole opened toward the outside; and a male screw member having a male screw portion having an outer diameter larger than the inner diameter of the circular hole. A spiral passage which is a spiral fluid passage formed by the inner peripheral surface of the circular hole and the thread groove of the male screw member by inserting the male screw portion of the member into the circular hole from the opening side and adjusting the insertion amount A screw type flow rate regulator characterized in that the flow path resistance of the screw can be adjusted.
It is desirable that the perforated member and the male screw member have the structure described in the following item (2) or (3), but it is not essential. For example, contrary to the invention described in (2), the male screw member is made of a softer material than the perforated member, and the thread of the male screw member is crushed and lowered as the male screw member is inserted into the circular hole. It may be made to be.
(2) The perforated member is made of a material softer than the male screw member, and a thread groove is formed in the inner peripheral portion of the perforated member as the male screw portion is screwed into the circular hole. Screw type flow controller as described in
By relatively rotating the male screw member and the perforated member, the amount of insertion of the male screw portion into the circular hole can be increased or decreased, and the male screw member and the perforated member can be simply moved relatively in the axial direction to reduce the insertion amount. The effect of facilitating the flow rate adjustment work can be obtained as compared with the case of increasing or decreasing.
The thread groove is preferably formed as described in the following item (3), but it is not essential. A part of the inner peripheral part of the perforated member may be cut by the male screw part to form a screw groove.
In addition, a thread groove having the same pitch as that of the male screw portion may be formed in advance on the inner peripheral portion of the perforated member. In this case, the male screw portion can be easily screwed. However, the thread groove formed in the inner peripheral portion of the perforated member is not formed to a depth capable of being screwed with the male screw portion as it is, but is formed in a state where it is further deepened as the male screw portion is screwed. It is desirable. In a state where the male screw portion is screwed to the inner peripheral portion of the perforated member by an arbitrary amount, the male screw portion is held by the perforated member with a sufficient tightening force, and a person is connected to the male screw member and the perforated member. This is because it is desirable that the two do not naturally rotate relative to each other unless they are intentionally rotated relative to each other.
(3) As the male screw portion is screwed into the circular hole, a thread groove is formed in the front inner peripheral portion by at least one of elastic deformation and plastic deformation of the inner peripheral portion of the perforated member (2 ) Screw-type flow regulator as described in the item.
According to the feature described in this section, there is an effect that chips are generated at the time of forming the thread groove, and that the chips can avoid narrowing the spiral passage in an unstable manner or mixing in the fluid. It is done.
(4) The screw type flow controller according to any one of (1) to (3), wherein an inner peripheral surface of the circular hole is a cylindrical surface having a constant diameter.
(5) The screw-type flow rate according to any one of (1) to (3), wherein the inner peripheral surface of the circular hole is a tapered inner peripheral surface whose diameter gradually decreases from the opening of the circular hole toward the back. Regulator.
If the configuration of this section is adopted, the flow path resistance of the spiral passage greatly changes with the change of the insertion amount of the male screw portion into the circular hole, so that the effect of shortening the adjustable range of the insertion amount can be obtained.
Moreover, when manufacturing a perforated member by shaping | molding which uses a type | mold, it will be in the state by which the draft was attached to the internal peripheral surface of a circular hole, and the effect that die-cutting will become easy is acquired.
(6) The screw-type flow controller according to any one of (1) to (5), wherein the male screw portion is a straight screw portion whose diameter is not changed in the axial direction of the male screw portion.
The straight thread portion is easier to form than the tapered thread portion described in the next section, and can reduce the manufacturing cost. In particular, when a commercially available machine screw or bolt is used as the male screw member, the effect of cost reduction is great.
(7) The threaded flow controller according to any one of (1) to (5), wherein the male threaded portion is a tapered threaded portion whose diameter gradually decreases toward the distal end side of the male threaded portion.
Even if the configuration of this section is adopted together with the configuration of (4), the flow resistance of the spiral passage changes greatly with the adjustment of the insertion amount of the male screw into the circular hole. The effect of shortening the possible range can be obtained, but if it is adopted in combination with the configuration of item (7), the adjustable range of the insertion amount can be further shortened.
(8) The perforated member is a valve body in which one or more intersecting passages intersecting the circular hole are formed, and the male screw portion extends from the opening to the circular hole to a depth exceeding the intersecting passage. When inserted, the space on the back side of the circular hole and the crossing passage are communicated with each other by the spiral passage, and between the vicinity of the opening of the circular hole and the corresponding portion of the male screw member The screw-type flow rate regulator according to any one of (1) to (7), wherein a seal member is disposed on the screw.
The screw type flow rate regulator according to this section constitutes a flow rate regulating valve for regulating the flow rate of the fluid from the back side of the circular hole to the cross passage or in the opposite direction.
The male threaded portion may be in a state of forming a spiral passage only between the portion where the circular hole intersects the intersecting passage and the portion farther from the intersecting portion, and the male threaded portion intersects the middle of the portion forming the spiral passage. The passages may be crossed.
Both the inner peripheral surface of the circular hole provided with the seal member and the outer peripheral surface of the male screw member corresponding thereto have a gap in which the seal member is disposed even if the insertion amount of the male screw portion into the circular hole is adjusted. In order not to change, it is desirable that the straight cylindrical surface has no taper. Various seal members can be used, but an O-ring is preferable. If an O-ring groove is formed in one of the inner peripheral surface of the circular hole and the corresponding outer peripheral surface of the male screw member, and the O-ring is disposed in the O-ring groove, the insertion amount of the male screw portion into the circular hole is adjusted. This is because sometimes the sealing member does not shift.
(9) A stepped portion having an inner diameter rapidly decreasing from the opening side toward the back side is formed in the circular hole, and the spiral passage and the intersecting passage are communicated with each other on the opening side from the stepped portion. (8) The screw type flow controller described in the item (8).
Later, as described as an embodiment, a stepped portion is formed by forming a circular hole into a stepped hole in which the opening side portion is a large diameter hole portion having a large diameter and the back side portion is a small diameter hole portion having a small diameter. The stepped portion may be formed by forming an annular groove having an inner diameter larger than that of the other portion in the axial direction of the circular hole. In the former case, it is desirable that the portion inserted into the large diameter portion of the male screw member is a large diameter portion.
Even if the stepped portion is not formed, the spiral passage and the crossing passage can be communicated with each other, and the formation of the stepped portion is not essential. However, if not formed, there will be a region where the length of the portion communicating with the cross passage of the spiral passage changes in a stepwise manner, and the flow rate adjustment operation becomes difficult. The length of the portion of the passage that communicates with the intersection passage changes continuously.
(10) A mounting portion that is attached to a hollow target member at an end of the perforated member opposite to the opening side of the circular hole in a state in which the circular hole communicates with an internal space of the target member. The screw-type flow rate regulator according to any one of (1) to (7).
The screw-type flow rate regulator according to this section constitutes a dripper that allows the liquid stored in the internal space of the hollow member to flow out and adjusts the flow rate of the flow.
(11) The screw flow rate regulator according to (10), wherein the hollow target member is an irrigation tube disposed in an irrigation target region for performing drip irrigation.
The screw-type flow controller according to this section constitutes a drip irrigation dripper that is attached to the irrigation tube and used for drip irrigation.
If the attachment portion has the configuration described in the next section, the attachment to the irrigation tube is facilitated, but it is not limited to this configuration. For example, it is possible to provide a mounting portion having a seating surface that sits around the mounting hole on the outer peripheral surface of the irrigation tube, and to fix the seating surface in an airtight manner by an appropriate means such as adhesion to the irrigation tube.
(12) The screw type flow rate regulator according to (11), wherein the attachment portion includes an insertion portion that is inserted into an attachment hole formed in a peripheral wall of the irrigation tube.
For example, if the outer diameter of the insertion part is slightly larger than the inner diameter of the mounting hole and the insertion part is fitted in the mounting hole and fitted, the insertion part is pushed out of the mounting hole by the water pressure acting on the irrigation tube, and the perforated member Can be prevented from detaching from the irrigation tube, and it is not essential to provide a retaining portion as in the next section. The perforated member can be formed of a tube or pipe having a constant diameter in the length direction. In particular, if the perforated member is composed of a tube made of a soft synthetic resin, the tube itself is also expanded by the internal water pressure and the outer diameter increases, so that the separation can be prevented even better.
(13) The screw-type flow controller according to (12), wherein the attachment portion includes a retaining portion formed at a distal end of the insertion portion with a diameter larger than that of the insertion portion.
If a retaining portion is provided as in this section, the insertion portion can be particularly reliably prevented from being detached from the mounting hole.

It is a figure which shows notionally the irrigation apparatus corresponding to the solar radiation amount containing the dripper which is one Embodiment of this invention. It is sectional drawing which shows the state in which the said dripper was attached to the irrigation tube. It is sectional drawing which expands and shows a part of said dripper. It is sectional drawing which shows the state in which the dripper which is another embodiment of this invention was attached to the irrigation tube. It is front sectional drawing which shows the flow control valve which is another embodiment of this invention.

  Embodiments of the claimable invention will be described in detail below with reference to the drawings. In addition to the following embodiments, the claimable invention can be implemented in various modifications based on the knowledge of those skilled in the art, including the aspects described in the above [Aspect of the Invention] section. .

  In FIG. 1, the solar radiation amount corresponding drip irrigation apparatus as one Embodiment is shown notionally. This apparatus includes a solar module 10 installed in the vicinity of a vegetable garden that is an example of an irrigation target area. The electrical energy generated by the solar module 10 is stored in the power storage device 14 while being controlled by the charge control device 12. The amount of electricity stored in the electricity storage device 14 (the amount of increase in electrical energy stored in the electricity storage device 14) is measured by the electricity storage amount measuring device 16, and based on the measurement result, the pump control device 18 uses the motor pump 20 (hereinafter referred to as the pump 20). (Abbreviated) is controlled, and water from the water source 22 is fed to the irrigation system 24 and irrigated from the drip tube 26 to the vegetable garden. For example, the pump control device 18 causes the pump control device 18 to operate the pump 20 for each set time every time the charged amount measured by the charged amount measuring device 16 reaches a set amount. In this way, as the amount of solar radiation in the irrigation target area increases, irrigation is performed more frequently, and ideal irrigation is realized. For example, a battery or a capacitor can be used as the power storage device 14. As the water source 22, an arbitrary channel such as an irrigation channel and a reservoir can be used, and the pump 20 having a relatively low head can be adopted. In this embodiment, a spiral pump driven by a DC motor is employed.

  The drip tube 26 is obtained by attaching the dripper 32 shown in FIG. 2 to a position corresponding to each crop of the irrigation tube 30 arranged along the row of crops in the vegetable garden. The dripper 32 includes a main body member 34 that is a kind of perforated member and an adjustment screw 36 that is a kind of male screw member. The body member is integrally manufactured by injection molding of synthetic resin such as polyacetal, polypropylene, ABS (acrylonitrile butadiene styrene), nylon, PPE (polyphenylene ether), polyethylene, fluororesin (eg, polytetrafluoroethylene), etc. It is a hollow member provided with a through-hole 40 having a circular cross-sectional shape that penetrates the center. The main body member 34 has an axial intermediate portion as an insertion portion 42, a distal end portion having a larger diameter retaining portion 44 than the insertion portion 42, and a rear end portion having a larger diameter main body portion 46 than the insertion portion 42. Yes. The retaining portion 44 has a diameter that gradually decreases toward the distal end side, and has a shape in which the diameter suddenly changes at the boundary with the insertion portion 42, and can be easily inserted into the mounting hole 48 formed in the irrigation tube 30, It is hard to come off. In the present embodiment, the insertion portion 42 and the retaining portion 44 constitute an attachment portion. Further, in the main body 46, as shown in an enlarged view in FIG. 3, the inner diameter of the through hole 40 is gradually reduced from the opening 42 toward the back side to form a tapered inner peripheral surface 50.

  The adjustment screw 36 is made of stainless steel and includes a male screw portion 60 and a head portion 62 having a constant diameter. The screw formed in the male thread portion 36 may be a coarse screw or a fine screw, but it is desirable to employ a fine screw when the flow rate to be adjusted is relatively small, and a coarse screw when the flow rate is relatively large. . The head 62 is provided with a tool engaging portion. In the example shown in the figure, a cross hole 64 with which a plus driver as a tool is engaged is formed. However, the head may have other forms such as a hexagon head, a head with a hexagon hole, and the like. It should be noted that when the adjusting screw 36 is screwed into the main body 46, the main body 46 is formed in a prismatic shape, is chamfered, serrated, or knurled to prevent the main body 46 from rotating around. It is desirable to form an anti-slip part such as an eye.

  As the male screw portion 60 of the adjusting screw 36 is screwed into the main body portion 46, the portion forming the tapered inner peripheral surface 50 of the main body portion 46 is recessed by elastic deformation and plastic deformation by the thread 66, and the comparison is made. A shallow groove is formed. As a result, a spiral passage 70 is formed by the tapered inner peripheral surface 50 and the thread groove 68. The spiral passage 70 functions as a kind of labyrinth that allows water to flow out of the opening 47 and imparts resistance to the flow, and becomes longer as the screwing amount of the adjusting screw 36 to the main body 46 increases. At the same time, the minimum value of the channel cross-sectional area (the channel cross-sectional area of the spiral passage 70 is minimized at the tip of the male screw portion 60) decreases. Therefore, the flow resistance imparted to the water flowing through the spiral passage 70 increases, and the flow rate decreases.

  As described above, the irrigation tube 30 is formed with the attachment holes 48 at regular intervals along the longitudinal direction thereof, and the dripper 32 is attached to each attachment hole 48. When water is sent to the irrigation tube 30 by the pump 20, the water is discharged from each dripper 32 in the form of droplets. Thus, since the flow resistance is provided by the dripper 32, it is avoided that the water pressure in the irrigation tube 20 varies greatly depending on the location, but if the irrigation tube 20 is still long, It is inevitable that the water pressure becomes lower toward the tip side. As a result, a difference occurs in the amount of water dripped from the dripper 32, so that the main body 46 of the adjustment screw 36 of the dripper 32 attached to the distal end side is compared with the dripper 32 attached to the proximal end side of the irrigation tube 20. The amount of screwing is reduced, and the amount of dripping is made uniform throughout the irrigation tube 30. The screwing amount of the adjustment screw 36 to the main body 46 may be changed continuously or may be changed stepwise.

  In this embodiment, the water supply interval from the pump 20 to the irrigation tube 30 and the time of one water supply are adjusted according to at least one of the amount of solar radiation, the type of crop, and the growth state. Alternatively, the irrigation amount can also be adjusted by adjusting the screwing amount of the adjustment screw 36 to the main body 46 in the dripper 32.

  Moreover, in the said embodiment, although the main body member 34 was made into the shape which has the insertion part 42, the retaining part 44, and the main-body part 46, this is not essential. For example, as in the dripper 72 shown in FIG. 4, the entire main body member 74 can be configured by a single tube. As the material, the same material as that of the main body member 34 can be used, but polyethylene is particularly preferable. If the outer diameter of the main body member 74 is made slightly larger than the inner diameter of the mounting hole 48 of the irrigation tube 30 and the main body member 74 is fitted into the mounting hole 48, the main body member 74 can be irrigated without providing a retaining portion. It has been confirmed by experiments that the tube 30 is not detached. In particular, if the main body member 74 is made of a soft synthetic resin tube, the water pressure acts on the main body member 74 and the main body member tube expands while the water pressure acts on the irrigation tube 30. The outer diameter increases, and the separation from the mounting hole 48 is prevented more satisfactorily.

  FIG. 5 shows a flow rate adjustment valve which is another embodiment of the present invention. The flow rate adjusting valve 80 includes a valve main body 82 which is a kind of perforated member and a regulating valve element 84 which is a kind of male screw member. The valve body 82 is made of synthetic resin, and has a through hole 86 that is a circular hole having a circular cross-sectional shape. As the synthetic resin, a resin excellent in chemicals and having sufficient strength and heat resistance, for example, a PPS resin (polyphenylene sulfide resin) is preferable. The through-hole 86 has openings 88 and 90 at both ends, the opening 88 side being a small-diameter hole portion 92 and the opening 90 side being a large-diameter hole portion 94. The large-diameter hole portion 94 is a straight hole having a constant diameter. The small-diameter hole portion 92 is also shown as a straight hole having a constant diameter in FIG. 4 and may actually be a straight hole. However, in this embodiment, the small-diameter hole portion 92 is directed from the opening 88 side toward the large-diameter portion 94 side. Thus, the diameter of the tapered hole is gradually increased. A cross passage 96 is formed at the end of the large-diameter hole portion 94 adjacent to the small-diameter hole portion 92 so as to be orthogonal to the through-hole 86. The crossing passage 96 opens toward the outside at the opening 98. However, in this embodiment, although not shown in the drawing, the portion of the valve body 82 in which the opening 88 is formed and the portion in which the opening 98 is formed are made of appropriate materials such as synthetic resin, rubber, and metal, respectively. Connected piping.

  The adjustment valve element 84 is made of stainless steel and includes a shaft portion 102, a male screw portion 104, and a head portion 106. The male screw portion 104 is a straight screw portion having a constant diameter over the entire length, and the shaft portion 102 is larger in diameter than the male screw portion 104. The male screw portion 104 is screwed into the small diameter hole portion 92 that is the tapered hole, while the shaft portion 102 is fitted into the large diameter hole portion 94. The small-diameter hole portion 92 does not initially have a thread groove on the inner peripheral surface, but as the male thread portion 104 is screwed, the inner peripheral surface vicinity portion is elastically deformed and plastically deformed to form a thread groove. And although illustration is abbreviate | omitted, it is the same as that of the said embodiment that a helical channel | path is formed by the internal peripheral surface of the small diameter hole part 92 and the thread groove of the external thread part 104. FIG. An O-ring groove is formed in the shaft portion 102, and an O-ring 108 is attached to the shaft portion 102, thereby maintaining liquid tightness between the valve body 82 and the regulating valve element 84.

In this embodiment, a liquid, which is a kind of fluid, flows out of the opening 98 from the opening 88 through the small-diameter hole portion 92, the spiral passage, and the crossing passage 96, but at that time, it receives flow resistance in the spiral passage. Since the flow resistance of the spiral passage increases as the screwing amount of the male screw portion 104 into the small-diameter hole portion 92 increases, the flow rate of the liquid flowing out from the opening 98 decreases. Conversely, if the screwing amount of the male screw portion 104 is decreased, the flow rate of the liquid flowing out from the opening 98 increases.
The valve body 82 can be formed of a metal such as stainless steel or brass. However, if the adjustment valve element 84 is also made of metal, It is desirable that at least a part of the female screw is formed or that the material of the adjustment valve element 84 is harder than the material of the valve body 82. When the control valve 84 is made of a synthetic resin, it is not essential that at least a part of the female screw is formed.

  In the present embodiment, only one cross passage 96 is formed, but a plurality of cross passages that cross the through hole 86 may be formed. The positions where the plurality of intersecting passages intersect the through hole 86 can be the same or different with respect to the longitudinal direction of the through hole 86. In the latter case, for example, at least one intersecting passage is made to intersect with the through-hole 86 in the middle of the threaded portion of the small diameter hole portion 92 and the male screw portion 104, so that at least two intersecting passages are formed. If a part of the spiral passage is present between them, the flow resistances for the two intersecting passages are different from each other, and the flow rates of the fluid in the two intersecting passages can be made different from each other.

  In the above embodiment, since the fluid is water, in order to avoid the generation of rust, the adjustment screw 36 and the adjustment valve element 84 which are male screw members are made of stainless steel. However, the fluid is a gas such as air. If it is a liquid or oil and there is little risk of rusting, it can be made of other metal materials such as ordinary steel or brass. In addition, a synthetic resin can be used as long as it is harder than the synthetic resin constituting the main body member. For example, the main body member is made of polyethylene or polypropylene, and the male screw member is made of polycarbonate or PPS resin. Further, the hardness can be reversed between the main body member and the male screw member. For example, the main body member is made of a metal material, and the male screw member is made of a synthetic resin.

  Moreover, although the screw of the external thread part was made into the single thread screw in the above embodiment, it can also be set as the multi-thread thread more than a double thread. If the number of threads is increased, a screw-type flow rate regulator capable of adjusting the flow rate in a region where the flow rate is high can be obtained while adopting the external thread portion having the same height and pitch thread.

26: Drip tube 30: Irrigation tube 32: Dripper 34: Main body member 36: Adjustment screw 40: Through hole 42: Insertion part 44: Retaining part 46: Main part 47: Opening 48: Mounting hole 50: Tapered inner peripheral surface 60 : Male screw part 62: Head part 64: Cross hole 68: Screw groove 70: Spiral passage 72: Dripper 74: Main body member 80: Flow control valve 82: Valve main body 84: Control valve element 86: Through hole 90: Opening 92: Small diameter Hole portion 94: Large diameter hole portion 96: Crossing passage 98: Opening 102: Shaft portion 104: Male screw portion 106: Head portion 108: O-ring

Claims (7)

  A perforated member having a circular cross-sectional shape and formed with a circular hole opened toward the outside; and a male screw member having a male screw portion having an outer diameter larger than the inner diameter of the circular hole, the male screw of the male screw member The spiral passage is a spiral fluid passage formed by the inner peripheral surface of the circular hole and the thread groove of the male screw member by inserting the circular hole into the circular hole from the opening side and adjusting the amount of insertion. A screw type flow regulator characterized in that the resistance is adjustable.   The perforated member is made of a material softer than the male threaded member, and the male threaded part is screwed into the circular hole, and at least one of elastic deformation and plastic deformation of the inner peripheral part of the perforated member, The screw type flow controller according to claim 1, wherein a thread groove is formed in an inner peripheral portion of the perforated member.   The screw-type flow controller according to claim 1 or 2, wherein the inner peripheral surface of the circular hole is a tapered inner peripheral surface whose diameter gradually decreases from the opening of the circular hole toward the back.   The perforated member is a valve body in which a cross passage that intersects the circular hole is formed, and the male screw portion is inserted from the opening into the circular hole to a depth exceeding the cross passage, and the circular hole The space on the back side and the crossing passage are communicated with each other by the spiral passage, and a seal member is disposed between the vicinity of the opening of the circular hole and the corresponding portion of the male screw member. The screw type flow regulator according to any one of claims 1 to 3.   A stepped portion having an inner diameter rapidly decreasing from the opening side toward the back side is formed in the circular hole, and the spiral passage and the intersecting passage communicate with each other on the opening side from the stepped portion. 4. The screw-type flow controller according to 4.   The perforated member is inserted into an attachment hole formed in the peripheral wall of the irrigation tube disposed in the irrigation target region for performing drip irrigation at the end opposite to the opening side of the circular hole. The screw-type flow regulator according to any one of claims 1 to 3, comprising an insertion portion.   The screw-type flow rate regulator according to claim 6, wherein the perforated member includes a retaining portion formed at a distal end of the insertion portion with a diameter larger than that of the insertion portion.

Images