Fluid device

Abstract

To improve work efficiency by facilitating attaching / detaching a blocking body to / from a body and improving operability.SOLUTION: A fluid device including a blocking body 10 having an internally fitted fitting part 11 fitted to an inner surface of a hole part 6 of a body 1 is such that: a spring ring 40 energized by a fitted surface Kb of the hole part 6 and pressed is provided; a fitting surface Ka of the fitting part 11 is formed with a first peripheral groove M1 into which the spring ring 40 with a reduced diameter is retracted, and a second peripheral groove M2 having a depth shallower than a diameter of the spring ring 40; a third peripheral groove M3 having a depth shallower than a diameter of the spring ring 40 is formed on the fitted surface Kb of the hole part 6; and there is provided separation means 60 for applying force in a direction of separating one projection 50 formed in a hole part forming part 7 and the other projection 51 formed in the blocking body 10 from each other, and holding the spring ring 40 in cooperation with a wall surface constituting the second peripheral groove M2 and a wall surface constituting the third peripheral groove M3.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a fluid device for flowing various fluids such as water, steam, oil, etc., and in particular to a fluid device having a main body having a hole communicating with a fluid flow path and a blocking body for blocking the hole of the main body. [Background technology]

[0002] Conventionally, as shown in FIG. 15, a pressure reducing valve as a fluid device is known as this type of fluid device (for example, as disclosed in JP 2020-172991 A). This fluid device Sa is configured to include a main body 100 having a fluid flow path (not shown) from an inlet 101 to an outlet 102 and a hole forming part 103 in which a hole (not shown) communicating with the flow path is formed, and a blocking body 104 that is detachably provided on the main body 100 and blocks the hole when attached. The blocking body 104 is provided with a control valve part (not shown) that controls the fluid flowing through the flow path of the main body 100 by opening and closing the control valve. A flange 105 is formed around the blocking body 104, while a flange 106 corresponding to the flange 105 of the blocking body 104 is also formed around the hole forming part 103 of the main body 100, and the flanges 105 and 106 are connected to each other by a plurality of (six) bolts 107 arranged at equal angular intervals. When necessary, the bolts 107 are removed to perform maintenance on the control valve portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-172991 A Summary of the Invention [Problem to be solved by the invention]

[0004] In this conventional fluid device, for example, when performing maintenance on the control valve of the obstruction body 104, the obstruction body 104 is removed from the main body 100, but in this case, the six bolts 107 must be removed one by one, which causes problems of poor operability, complicated work, and poor work efficiency. On the other hand, after the maintenance is completed, the obstruction body 104 is attached to the main body 100 again, but in this case, the six bolts 107 must be attached one by one, which causes problems of poor operability, complicated work, and poor work efficiency.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a fluid device that makes it easier to attach and remove a blocking body from the main body, improves operability, and improves work efficiency. [Means for solving the problem]

[0006] In order to achieve the above object, the fluid device of the present invention is a fluid device comprising: a main body having a flow path for a fluid and a hole forming portion in which a hole communicating with the flow path is formed; and a closing body that is detachably provided on the main body and closes the hole when the closing body is attached, a fitting portion is provided in the blocking body, the fitting portion being fitted into the inner surface of the hole portion to fit therein or the outer surface of the hole forming portion to fit therein, the inner surface of the fitting portion being a fitting surface formed of a circumferential surface, and the inner surface of the hole portion or the outer surface of the hole forming portion corresponding to the fitting surface of the fitting portion being a fitted surface formed of a circumferential surface, Between the inserting surface and the receiving surface, a substantially C-shaped spring ring is provided along the circumferential direction thereof, the spring ring being biased against the inserting surface or the receiving surface and elastically deformed, a first circumferential groove into which the spring ring, which has been elastically deformed to have a reduced or increased diameter, can be inserted on one of the inserting surface and the receiving surface opposite to the side pressed by the urging force of the spring ring; and a second circumferential groove, which is continuous with the first circumferential groove and is provided on the rear side of the inserting surface and the receiving surface in a relative insertion / removal direction relative to the other, and has a depth shallower than the diameter of the spring ring; a third circumferential groove having a depth shallower than a diameter of the spring ring that cooperates with the second circumferential groove to hold the spring ring on the other of the fitting surface and the fitted surface that is pressed by the spring ring; a plurality of one-side projections are provided at equal angular intervals around a central axis of the hole on the outside of the hole forming portion, and a plurality of other-side projections are provided on the outside of the blocking body so as to face the one-side projections; The spring ring is configured to include a spacing means provided for each pair of the one convex portion and the opposing other convex portion, which applies force in a direction to separate the one convex portion and the other convex portion of each pair from each other, and which cooperates with the wall surface constituting the second circumferential groove and the wall surface constituting the third circumferential groove to clamp the spring ring.

[0007] The multiple one-side convex portions may be continuous and integral with each other to protrude in a flange shape. Similarly, the multiple other-side convex portions may be continuous and integral with each other to protrude in a flange shape. In short, as long as the multiple spacing means act at equal angular intervals, the multiple one-side convex portions and the multiple other-side convex portions may be formed to protrude in any manner and may be modified as appropriate.

[0008] In the configuration of the present invention, a spring ring is selected from either a type that is biased in a radially expanding direction and pressed against either the inserted surface or the fitting surface, or a type that is biased in a radially reducing direction and pressed against either the inserted surface or the fitting surface, and accordingly, a fitted surface is formed which consists of the inner surface of the hole on the main body side into which the fitting portion is fitted or the outer surface of the hole forming portion, and a fitting surface of the fitting portion which corresponds to this fitted surface is formed.

[0009] The fitting portion of the closure body is of two types: a male type that fits inside, and a female type that fits outside. In the case of the male type, the outer surface of the fitting portion is configured as the fitting surface, and the inner surface of the hole of the main body is configured as the receiving surface. On the other hand, in the case of the female type, the fitting portion is formed, for example, in a cylindrical shape with a recess, and its inner surface is configured as the fitting surface, and the outer surface of the hole forming part of the main body is configured as the receiving surface.

[0010] For example, as will be shown in the embodiment described later, there are the following modes (types). <Type 1> The spring ring is selected to be of a type that is biased in a radially expanding direction to be pressed against either the fitted surface or the fitting surface, and the fitting portion of the closure body is formed into a male type. In this case, the outer surface of the fitting portion of the closure body is used as the fitting surface, and a first circumferential groove and a second circumferential groove are formed therein, and the inner surface of the hole of the main body is used as the receiving surface, and a third circumferential groove is formed therein. The second circumferential groove is provided continuous with the first circumferential groove on the rear side of the fitting surface in which it is formed in the relative fitting release direction relative to the receiving surface, i.e., it is provided continuous with the rear side in the fitting release direction (removal direction) of the fitting portion. The spring ring is biased in the radial expansion direction and pressed against the receiving surface of the hole.

[0011] <Type 2> The spring ring is selected to be of a type that is biased in a radially expanding direction to be pressed against either the fitted surface or the fitting surface, and the fitting portion of the closure body is formed into a female shape. In this case, the fitting portion of the closure body is formed, for example, cylindrically with a recess, its inner surface being the fitting surface on which the third circumferential groove is formed, and the outer surface of the hole forming portion of the main body being the receiving surface on which the first circumferential groove and the second circumferential groove are formed. The second circumferential groove is provided continuous with the first circumferential groove on the rear side of the receiving surface in the fitting release direction relative to the fitting surface on which it is formed, that is, continuous with the tip side of the hole forming portion. The spring ring is biased in the radial expansion direction and pressed against the fitting surface of the fitting portion.

[0012] <Type 3> The spring ring is selected to be of a type that is biased in a diameter reducing direction to be pressed against either the fitted surface or the fitting surface, and the fitting portion of the closure body is formed into a male type. In this case, the outer surface of the fitting portion of the closure body is used as the fitting surface, and a third circumferential groove is formed thereon, and the inner surface of the hole of the main body is used as the receiving surface, and a first circumferential groove and a second circumferential groove are formed thereon. The second circumferential groove is provided continuous with the first circumferential groove on the rear side of the receiving surface in the fitting release direction relative to the fitting surface on which it is formed, that is, continuous with the tip side (opening edge side) of the hole. The spring ring is biased in the diameter reducing direction and pressed against the fitting surface of the fitting portion.

[0013] <Type 4> The spring ring is selected to be of a type that is biased in a diameter reducing direction to be pressed against either the fitted surface or the fitting surface, and the fitting portion of the closure body is formed into a female shape. In this case, the fitting portion of the closure body is formed, for example, in a cylindrical shape having a recess, its inner surface being the fitting surface on which the first and second circumferential grooves are formed, and the outer surface of the hole forming portion of the main body being the receiving surface on which the third circumferential groove is formed. The second circumferential groove is provided continuous with the first circumferential groove on the rear side of the fitting surface on which it is formed in the relative fitting release direction relative to the receiving surface, i.e., it is provided continuous with the rear side of the fitting portion in the fitting release direction (removal direction). The spring ring is biased in the diameter reducing direction and pressed against the receiving surface of the hole forming portion.

[0014] As a result, when the closure is attached to the main body, in the case of a type in which the spring ring is biased in the diameter-expanding direction to be pressed against either the inserted face or the inserting face, the spring ring is contracted in diameter to be immersed in the first circumferential groove, and in the case of a type in which the spring ring is biased in the diameter-expanding direction to be pressed against either the inserted face or the inserting face, the spring ring is expanded in diameter to be immersed in the first circumferential groove, and in this state, the inserting portion of the closure is inserted into the inner surface of the corresponding hole on the main body side or the outer surface of the hole forming portion. That is, the inserting portion of the closure is moved in the inserting direction (insertion direction). In this case, since the spring ring is immersed in the first circumferential groove, there is no spring ring on the inserted face or the inserting face, and therefore the inserting is performed smoothly.

[0015] During this insertion process, the diameter contraction or expansion of the spring ring is released, and the first circumferential groove and the third circumferential groove are made to face each other and match. As a result, since the third circumferential groove is formed on the other of the inserted surface and the inserting surface to which the spring ring is biased and pressed, the spring ring enters the third circumferential groove due to the biasing force. Since the third circumferential groove is shallower than the diameter of the spring ring, it straddles the first and third circumferential grooves.

[0016] In this state, the separating means applies force in a direction that separates the one convex portion and the other convex portion from each other, and the closure is moved in the direction of releasing the insertion of the fitting (removal direction) of the fitting. As a result, the part of the spring ring that straddles the first and third circumferential grooves on the first circumferential groove side enters the second circumferential groove, and the spring ring is held in cooperation with the second and third circumferential grooves. Furthermore, when the separating means applies force in a direction that separates the one convex portion and the other convex portion from each other and the closure is moved in the direction of releasing the insertion of the fitting (removal direction) of the fitting, the spring ring is clamped and held in cooperation with the wall surface constituting the second circumferential groove and the wall surface constituting the third circumferential groove. Therefore, the closure is firmly fixed to the main body and closes the hole.

[0017] On the other hand, when the closure is to be removed from the main body for maintenance of the inside of the main body or the like, the force in the separating direction applied to the one convex portion and the other convex portion is released by the separating means, in the opposite manner to the above. In the type in which the spring ring is biased in the diameter expanding direction to be pressed against either the fitted face or the fitting face, while a force is applied in the diameter contracting direction, if the closure is moved slightly in the fitting direction (insertion direction) of the fitting portion while a force is applied in the diameter expanding direction, the spring ring sinks into the first circumferential groove, and in this state, if the closure is then moved in the opposite direction in the fitting release direction (removal direction) of the fitting portion, the spring ring sinks into the first circumferential groove, and the spring ring is no longer on the fitted face or the fitting face, so that the closure can be smoothly removed.

[0018] In this way, the attachment and detachment of the closure body to the main body can be performed by simple operations of reducing or expanding the diameter of the spring ring and applying and releasing a force in the separating direction to one convex portion and the other convex portion using the separating means, and therefore can be performed easier than the conventional operations for attaching and detaching a bolt, thereby improving operability and improving work efficiency.

[0019] If necessary, the spring ring has outward protrusions at both ends which can be moved toward each other in a direction opposite to the pressing direction of the spring ring due to the urging force of the spring ring to reduce the diameter of the spring ring, or moved away from each other to increase the diameter of the spring ring, A protrusion holding portion is formed on either the hole forming portion or the fitting portion, which is in an externally fitted relationship with the other, to hold the protrusion of the spring ring so that it can move toward or away from the other.

[0020] The outward protrusion of the spring ring facing the protrusion holding portion can be manually operated to reduce or expand the diameter of the spring ring, making it easier to insert the spring ring into the first circumferential groove, thereby further improving operability and improving work efficiency.

[0021] Furthermore, if necessary, a seal ring that elastically contacts either the receiving surface or the inserting surface may be provided at a position that does not interfere with the protruding piece holding portion when the closure is attached, thereby improving the sealing performance. Also, since the seal ring is provided at a position that does not interfere with the protruding piece holding portion, there is no hindrance to the operability of attaching and removing the closure to the main body.

[0022] In addition, if necessary, the diameter of the spring ring is D, the depth of the first circumferential groove is Ha, the width of the first circumferential groove is La, the depth of the second circumferential groove is Hb, the width of the second circumferential groove is Lb, the depth of the third circumferential groove is K, and the width of the third circumferential groove is J, It is configured such that D<Ha, D<La, 0.5D<Hb < D, 0.5D<K < D, 0.5D<Lb, and D<J are set. Within this range, reliable operability can be ensured, and the spring ring can be reliably held.

[0023] Furthermore, if necessary, the separation means is formed on either one of the one convex portion and the other convex portion, and includes a through female screw having an axis parallel to the axis of the hole portion, and a male screw that engages with the female screw and whose tip abuts against the other one, and applies a force in a direction to separate the one convex portion and the other convex portion from each other by screwing. Thus, since the separation means is configured by a screw mechanism, the structure can be simplified.

[0024] In this case, it is effective that the bolt is configured as a manually operable butterfly bolt. It can be easily operated manually, and the operability can be further improved.

[0025] Also, the number of pairs of the one convex portion and the other convex portion facing it can be, for example, 3 pairs, 4 pairs, etc. in an equiangular relationship, and any number is acceptable. However, it is effective that the pair of the one convex portion and the other convex portion facing it is provided at symmetric positions of 180° around the central axis of the hole portion. As a result, the separation means is also provided at symmetric positions of 180° around the central axis of the hole portion. Therefore, since it is only necessary to operate at two locations, the operability can be further improved and the working efficiency can be improved.

Advantages of the Invention

[0026] As described above, according to the fluid device of the present invention, the attachment and detachment of the closing body to and from the main body can be performed by simple operations such as reducing or expanding the diameter of the spring ring and applying and releasing a force in the separating direction to the one convex portion and the other convex portion by the separation means. Therefore, it can be easily performed compared to the operation of attaching and detaching a conventional bolt, and thus, the operability can be improved and the working efficiency can be improved.

Brief Description of the Drawings

[0027] [Figure 1] 1 is a perspective view showing a fluid device according to a first embodiment of the present invention; [Diagram 2] 1 is an exploded perspective view showing a fluid device according to a first embodiment of the present invention; [Diagram 3] 1 is a cross-sectional view showing a fluid device according to a first embodiment of the present invention. [Figure 4] 1 is a vertical cross-sectional view showing a fluid device according to a first embodiment of the present invention. [Diagram 5] 1 is an enlarged cross-sectional view showing a main portion of a fluid device according to a first embodiment of the present invention; [Figure 6] This shows the process of attaching a blocking body to a main body in a fluid device of the first embodiment of the present invention, where (a) is a diagram before attachment and (b) is a diagram of the state in which the spring ring has been immersed in the first circumferential groove during the attachment process. [Figure 7] 1 is a diagram showing a fluid device according to a first embodiment of the present invention, with a closing body attached to a main body, together with an enlarged cross-sectional view of a main portion. FIG. [Figure 8] This shows a fluid device of the second embodiment of the present invention, together with the process of attaching a closure to a main body, where (a) is a diagram before attachment and (b) is a diagram showing the state in which the spring ring has been immersed in the first circumferential groove during the attachment process. [Figure 9] 13 is a diagram showing a fluid device according to a second embodiment of the present invention, with a closing body attached to the main body, together with an enlarged cross-sectional view of a key portion. FIG. [Figure 10] This shows a fluid device of a third embodiment of the present invention, together with the process of attaching a closure to a main body, where (a) is a diagram before attachment and (b) is a diagram showing the state in which the spring ring has been immersed in the first circumferential groove during the attachment process. [Figure 11] 13 is a diagram showing a fluid device according to a third embodiment of the present invention, together with an enlarged cross-sectional view of a key portion, showing the state in which a blocking body is attached to a main body. FIG. [Figure 12]A fluid device according to a fourth embodiment of the present invention is shown together with the process of attaching a closure to a main body, where (a) is a diagram before attachment and (b) is a diagram showing the state in which the spring ring has been immersed in the first circumferential groove during the attachment process. [Figure 13] 13 is a diagram showing a fluid device according to a fourth embodiment of the present invention, with a blocking body attached to a main body, together with an enlarged cross-sectional view of a key portion. FIG. [Figure 14] 10A and 10B show another example of the spacing means in the embodiment of the present invention, where FIG. 10A shows another example using a screw mechanism, and FIG. 10B shows an example using a spring. [Figure 15] 1A and 1B show an example of a conventional fluid device, in which (a) is a perspective view seen from above, and (b) is a perspective view seen from below. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fluid device according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings. (1) Fluidic device according to the first embodiment <Type 1> 1 to 7 show a fluid device S according to a first embodiment of the present invention. This fluid device S is a pressure reducing valve having a function of controlling the pressure reduction of a fluid. This fluid device S has a main body 1 having a fluid flow path 4 extending from a fluid inlet 2 to an outlet 3. The inlet 2 and the outlet 3 are provided so as to open about a single axis Q, and an outer through hole 5 is formed in the upper wall of this main body 1, the outer through hole 5 being open about a central axis P perpendicular to the axis Q. The main body 1 is further formed with a hole forming portion 7, which is coaxial with the central axis P of the outer through hole 5, has an inner diameter larger than that of the outer through hole 5, and has a hole 6 formed therein that communicates with the flow path 4 through the outer through hole 5.

[0029] The fluid device S is also configured with a blocking body 10 that is detachably attached to the main body 1 and blocks the hole 6 when attached. The blocking body 10 is provided with a fitting portion 11 that is inserted into the inner surface of the hole 6 and fits therein, or that is inserted into the outer surface of the hole forming portion 7 and fits therein. In the first embodiment, the fitting portion 11 is formed to be inserted into the inner surface of the hole 6 and fit therein. That is, the fitting portion 11 of the blocking body 10 is male.

[0030] The obstruction body 10 is provided with a control valve section 20 that, when attached, controls the fluid by opening and closing the flow path 4 from the inlet 2 to the outlet 3 using a control valve 21. As shown in Fig. 4, the control valve section 20 includes a disk-shaped control valve 21, a rod 22 whose one end is slidably supported on the lower wall of the main body 1 and supports the control valve 21 midway on the one end side, a cylindrical body 24 into which the other end side of the rod 22 is loosely inserted beyond the control valve 21 so that the fluid from the inlet 2 side flows in through a side hole 23 opened midway and flows out from the one end opening to the outlet 3 side, and a bearing 25 that is provided at the other end opening of the cylindrical body 24 and supports the rod 22. The one end opening of the cylindrical body 24 is configured as a valve seat 26 against which the control valve 21 abuts and which blocks the flow path 4 when abutted. The cylindrical body 24 is supported at its midpoint in the axial direction by being sealed with an O-ring in the outer through-hole 5, and at its one axial end side by being sealed with an O-ring in an inner through-hole 28 opened in a partition wall 27 separating the flow path 4 on the inlet 2 side from the flow path 4 on the outlet 3 side and having the central axis P as its axis. The other end side of the cylindrical body 24 is supported by being penetrated by the wall 12 constituting the fitting portion 11 of the blocking body 10.

[0031] The control valve section 20 also includes a diaphragm 30 that supports the other end of the rod 22. The diaphragm 30 forms a pressure chamber 32 into which the fluid on the outlet 3 side enters via a communication passage 31 between the diaphragm 30 and the wall body 12 that constitutes the fitting section 11. A cup-shaped lid 33 that is provided on the upper side of the diaphragm 30 and covers the diaphragm 30 is provided in the fitting section 11, and a coil spring 34 that is stored in a compressed state coaxially with the rod 22 and presses the diaphragm 30 is stored inside the lid 33. The lid 33 is fixed to the fitting section 11 with six bolts 37. Reference numeral 35 denotes an adjustment bolt that is provided on the lid 33 coaxially with the coil spring 34 so as to be movable forward and backward, and that adjusts the compression strength of the coil spring 34, and reference numeral 36 denotes a lock nut that positions the adjustment bolt 35 at an appropriate position.

[0032] More specifically, as described above, the closure 10 is provided with the fitting portion 11 which is fitted into the inner surface of the hole 6, and the fitting or external fitting surface of the fitting portion 11 (the outer surface which fits in the first embodiment) is configured as a fitting surface Ka consisting of a circumferential surface. On the other hand, the inner surface of the hole 6 or the outer surface of the hole forming portion 7 (the inner surface of the hole 6 in the first embodiment) which corresponds to the fitting surface Ka of the fitting portion 11 is configured as a fitted surface Kb consisting of a circumferential surface.

[0033] Between the insert surface Ka and the receiving surface Kb, a spring ring 40 having a substantially C-shape is provided, which is biased and pressed against the insert surface Ka or the receiving surface Kb along the circumferential direction (biased and pressed against the receiving surface Kb in the first embodiment) and elastically deforms. That is, a type that is biased in a radially expanding direction and pressed against the receiving surface Kb is selected as the spring ring 40. The spring ring 40 is biased in a radially expanding direction and pressed against the receiving surface Kb of the hole portion 6.

[0034] In addition, the spring ring 40 has outward protrusions 41 protruding from both ends, which can be moved toward each other in the direction opposite to the pressing direction of the spring ring 40 due to the urging force, thereby enabling the spring ring 40 to contract in diameter, or moved away from each other, thereby enabling the spring ring 40 to expand in diameter. In the first embodiment, the protrusions 41 have the function of enabling the spring ring 40 to contract in diameter.

[0035] A protrusion holding portion 42 that holds the protrusions 41 of the spring ring 40 so that they can move toward or away from each other (movable toward each other in the first embodiment) is formed on either the hole forming portion 7 or the fitting portion 11 (the hole forming portion 7 in the first embodiment). The protrusion holding portion 42 is formed by cutting out a part of the wall of the hole forming portion 7 in the circumferential direction so that the pair of protrusions 41 protrude outward, and the pair of protrusions 41 can be brought toward each other with the fingers of one hand to reduce the diameter.

[0036] A first circumferential groove M1 is formed in either the inserting surface Ka or the fitted surface Kb (the inserting surface Ka in the first embodiment) on the side opposite to the side pressed by the spring ring 40, into which the spring ring 40 can be inserted after being elastically deformed to have a reduced or increased diameter (reduced diameter in the first embodiment), and a second circumferential groove M2 is formed continuously with the first circumferential groove M1 on the rear side of the inserting surface Ka or the fitted surface Kb in the insertion release direction R relative to the other (on the rear side of the inserting surface Ka in the insertion release direction R in the first embodiment) and has a depth shallower than the diameter of the spring ring 40. That is, the second circumferential groove M2 is formed continuously with the rear side of the inserting portion 11 in the insertion release direction R (removal direction).

[0037] In addition, a third circumferential groove M3 having a depth shallower than the diameter of the spring ring 40 is formed on the other of the insertion surface Ka and the inserted surface Kb on the side pressed by the force of the spring ring 40 (the inserted surface Kb in the first embodiment) and cooperates with the second circumferential groove M2 to hold the spring ring 40.

[0038] Specifically, as shown in FIG. 7, when the diameter of the spring ring 40 is D, the depth of the first circumferential groove M1 is Ha, the width of the first circumferential groove M1 is La, the depth of the second circumferential groove M2 is Hb, the width of the second circumferential groove M2 is Lb, the depth of the third circumferential groove M3 is K, and the width of the third circumferential groove M3 is J, they are set such that D < Ha, D < La, 0.5D < Hb < D, 0.5D < K < D, 0.5D < Lb, and D < J. Within this range, reliable operability can be ensured, and the spring ring 40 can be reliably held.

[0039] Also, outside the hole forming portion 7, a plurality of one-sided convex portions 50 are provided at equal angular intervals around the central axis P of the hole 6, and outside the closing body 10, a plurality of other-sided convex portions 51 that can face the one-sided convex portions 50 are provided. In the embodiment, the pair of the one-sided convex portion 50 and the other-sided convex portion 51 facing it are provided at symmetric positions of 180° around the central axis P of the hole 6.

[0040] Further, for each pair of the one-sided convex portion 50 and the other-sided convex portion 51 facing it, a separating means 60 is provided that applies a force in a direction to separate the one-sided convex portion 50 and the other-sided convex portion 51 of each pair from each other, and the spring ring 40 is held in cooperation by the wall surface constituting the second circumferential groove M2 and the wall surface constituting the third circumferential groove M3. The separating means 60 is provided at symmetric positions of 180° around the central axis P of the hole 6.

[0041] The separating means 60 is configured using a screw mechanism and includes a through female screw 61 formed on either the one-sided convex portion 50 or the other-sided convex portion 51 (the other-sided convex portion in the embodiment) and having an axis parallel to the axis of the hole 6, and a bolt 63 having a male screw 62 that engages with the female screw 61 and whose tip abuts against the other and applies a force in a direction to separate the one-sided convex portion 50 and the other-sided convex portion 51 from each other by screwing. The bolt 63 is configured as a manually operable wing bolt. Thereby, the configuration of the separating means 60 can be simplified.

[0042] Furthermore, a seal ring 70 (O-ring) that elastically contacts the other of the inserted surfaces Kb and Ka (inserted surface Kb in the first embodiment) is provided in a position that does not interfere with the protrusion retaining portion 42 when the closure body 10 is installed.

[0043] Therefore, in this embodiment, when the blocking body 10 is attached to the main body 1, as shown in Fig. 6, since the spring ring 40 is biased in the diameter expanding direction and pressed against the fitted insertion surface Kb, the diameter is reduced to be immersed in the first circumferential groove M1 of the fitting insertion surface Ka, and in this state, the fitting insertion portion 11 of the blocking body 10 is fitted and inserted into the inner surface of the corresponding hole portion 6 on the main body 1 side. That is, the fitting insertion portion 11 of the blocking body 10 is moved in the fitting insertion direction (insertion direction).

[0044] During this fitting process, as shown in Fig. 7, the diameter reduction of the spring ring 40 is released and the first circumferential groove M1 and the third circumferential groove M3 are made to face each other and align. As a result, since the third circumferential groove M3 is formed on the fitting surface Kb to which the spring ring 40 is biased and pressed, the spring ring 40 enters the third circumferential groove M3 due to the biasing force. Since the third circumferential groove M3 is shallower than the diameter of the spring ring 40, it straddles the first circumferential groove M1 and the third circumferential groove M3.

[0045] In this state, the spacing means 60 applies force to the one-side convex portion 50 and the other-side convex portion 51 in a direction to separate them from each other, and the blocking body 10 is moved in the insertion release direction R (removal direction) of the fitting-insertion portion 11. As a result, the part of the spring ring 40 on the first circumferential groove M1 side, which straddled the first circumferential groove M1 and the third circumferential groove M3, enters the second circumferential groove M2, and the spring ring 40 is held in cooperation with the second circumferential groove M2 and the third circumferential groove M3. Furthermore, the spacing means 60 applies force in a direction to separate the one-side convex portion 50 and the other-side convex portion 51 from each other, and the blocking body 10 is moved in the insertion release direction R (removal direction) of the fitting-insertion portion 11, and the spring ring 40 is clamped and held in cooperation with the wall surface constituting the second circumferential groove M2 and the wall surface constituting the third circumferential groove M3. Therefore, the blocking body 10 is firmly fixed to the main body 1 and blocks the hole 6 .

[0046] On the other hand, when removing the blocking body 10 from the main body 1 for maintenance inside the main body 1 or the like, the force in the separating direction applied to the one convex portion 50 and the other convex portion 51 is released by the separating means 60 in the opposite manner to the above. Since the spring ring 40 is biased in the diameter expanding direction and pressed against the fitted insertion surface Kb, when the blocking body 10 is moved slightly in the fitting insertion direction (insertion direction) of the fitting insertion portion 11 while applying a force in the diameter reducing direction, the spring ring 40 sinks into the first circumferential groove M1, and when the blocking body 10 is then moved in the fitting release direction R (removal direction) of the fitting insertion portion 11 in this state, the spring ring 40 sinks into the first circumferential groove M1, so that the spring ring 40 is not present on the fitted insertion surface Kb and the fitting insertion surface Ka, and therefore the blocking body 10 can be smoothly removed.

[0047] In this way, the attachment and detachment of the obstruction body 10 to the main body 1 can be performed by a simple operation of reducing the diameter of the spring ring 40 and applying and releasing a force in the separating direction to the one convex portion 50 and the other convex portion 51 by the separating means 60, and therefore can be performed more easily than the conventional operation of attaching and detaching a bolt, thereby improving operability and improving work efficiency.

[0048] In this case, the spring ring 40 is manually contracted, but since the hole forming portion 7 is formed with the projection holding portion 42 configured with a notch that holds the projections 41 of the spring ring 40 so that they can be moved close to each other, the pair of projections 41 can be brought close to each other with the fingers of one hand to contract the diameter. This makes it easier to insert the spring ring 40 into the first circumferential groove M1, thereby further improving operability and improving work efficiency.

[0049] Furthermore, since the pair of one convex portion 50 and the opposing other convex portion 51 are provided at positions symmetrical at 180° about the central axis P of the hole 6, the spacing means 60 is also provided at positions symmetrical at 180° about the central axis P of the hole 6, and therefore the spacing means 60 only needs to be operated in two places, further improving operability and improving work efficiency. Furthermore, since the bolt 63 is composed of a manually operable wing bolt, it can be easily operated manually, further improving operability.

[0050] Next, the control of the fluid in the fluidic device S according to this embodiment will be described. 4, the control valve 21 is normally open to allow the fluid to flow, and when the pressure on the outlet 3 side increases, and the pressure in the pressure chamber 32 increases, the control valve 21 closes to stop the flow of the fluid and reduce the pressure on the outlet 3 side. In this case, the fluid on the outlet 3 side enters the pressure chamber 32 through the communication passage 31, but since the seal ring 70 is provided between the fitted insertion surface Kb and the fitting insertion surface Ka, sealing is ensured. In addition, the seal ring 70 is provided at a position where it does not interfere with the protruding piece holding portion 42 when the blocking body 10 is attached, so there is no impediment to operability in attaching and removing the blocking body 10 to and from the main body 1.

[0051] (2) Fluidic device S according to the second embodiment <Type 2> 8 and 9 show a fluid device S according to a second embodiment of the present invention. This fluid device S is a pressure reducing valve having a function of controlling the pressure reduction of a fluid, and is basically configured similarly to the fluid device S according to the first embodiment, but differs from the fluid device S according to the first embodiment in the configurations of the hole forming portion 7 of the main body 1 and the fitting portion 11 of the blocking body 10. The fitting portion 11 of the blocking body 10 is formed to be fitted and externally fitted to the outer surface of the hole forming portion 7 of the main body 1, and is of a female type. That is, the side of the fitting portion 11 of the blocking body 10 that forms the pressure chamber 32 is formed, for example, in a cylindrical shape having a recess, and the surface of the fitting portion 11 that fits inside or fits outside (the inner surface that fits outside in the second embodiment) is configured as a fitting surface Ka consisting of a circumferential surface. On the other hand, the inner surface of the hole 6 or the outer surface of the hole forming portion 7 (the outer surface of the hole forming portion 7 in the second embodiment) that corresponds to the fitting surface Ka of the fitting portion 11 is configured as a fitting surface Kb consisting of a circumferential surface.

[0052] Between the inserting surface Ka and the receiving surface Kb, a spring ring 40 having a substantially C-shape similar to that described above is provided, which is biased and pressed against the inserting surface Ka or the receiving surface Kb along the circumferential direction (biased and pressed against the inserting surface Ka in the second embodiment). That is, the spring ring 40 is of a type that is biased in the radially expanding direction and pressed against the inserting surface Ka. The spring ring 40 is biased in the radially expanding direction and pressed against the inserting surface Ka of the inserting portion 11.

[0053] A protrusion holding portion 42 that holds the protrusions 41 of the spring ring 40 so that they can move toward or away from each other (movable toward each other in the second embodiment) is formed on either the hole forming portion 7 or the fitting portion 11, which is the side that fits over the other (the fitting portion 11 in the second embodiment). The protrusion holding portion 42 is formed by cutting out part of the cylindrical wall of the fitting portion 11 in the circumferential direction so that the pair of protrusions 41 protrude outward, and the pair of protrusions 41 can be brought toward each other with the fingers of one hand to reduce the diameter.

[0054] A first circumferential groove M1 is formed in either the inserting surface Ka or the fitted surface Kb (the fitted surface Kb in the second embodiment) on the side opposite to the side pressed by the spring ring 40, into which the spring ring 40 can be inserted after being elastically deformed to have a reduced or increased diameter (reduced diameter in the second embodiment). A second circumferential groove M2 is formed in continuation with the first circumferential groove M1 on the rear side of either the inserting surface Ka or the fitted surface Kb in the fitting release direction R relative to the other (in the second embodiment, the rear side of the fitted surface Kb in the fitting release direction R). The second circumferential groove M2 is formed in continuation with the tip side of the hole forming portion 7. In addition, a third circumferential groove M3 having a depth shallower than the diameter of the spring ring 40 is formed on the other of the insertion surface Ka and the inserted surface Kb on the side pressed by the force of the spring ring 40 (in the second embodiment, the insertion surface Ka of the insertion portion 11) which cooperates with the second circumferential groove M2 to hold the spring ring 40.

[0055] Further, a seal ring 70 (O-ring) that elastically contacts the other of the fitted surfaces Kb and Ka (fitted surface Ka in the second embodiment) is provided at a position that does not interfere with the protruding piece holding portion 42 when the closure 10 is attached. The other configurations are the same as those described above. Therefore, the fluid device S according to the second embodiment also provides the same functions and effects as those described above.

[0056] (3) Fluid device S according to the third embodiment <Type 3> 10 and 11 show a fluid device S according to a third embodiment of the present invention. This fluid device S is a pressure reducing valve having a function of controlling the pressure reduction of a fluid, and is basically configured similarly to the fluid devices S according to the first and second embodiments, but differs from the fluid devices S according to the first and second embodiments in the configuration of the spring ring 40, the hole forming portion 7 of the main body 1, and the fitting portion 11 of the blocking body 10. The fitting portion 11 of the blocking body 10 is formed to be fitted into the inner surface of the hole 6 of the main body 1 and is male-type. That is, the surface of the fitting portion 11 of the blocking body 10 that fits inside or fits outside (the outer surface that fits inside in the third embodiment) is configured as a fitting surface Ka consisting of a circumferential surface. On the other hand, the inner surface of the hole 6 or the outer surface of the hole forming portion 7 (the inner surface of the hole 6 in the third embodiment) corresponding to the fitting surface Ka of the fitting portion 11 is configured as a fitting surface Kb consisting of a circumferential surface.

[0057] Between the inserting surface Ka and the receiving surface Kb, a spring ring 40 having a substantially C-shape is provided, which is biased and pressed against the inserting surface Ka or the receiving surface Kb along the circumferential direction (biased and pressed against the inserting surface Ka in the third embodiment) and elastically deforms. That is, a type that is biased in a diameter-reducing direction and pressed against the inserting surface Ka is selected as the spring ring 40. The spring ring 40 is biased in a diameter-reducing direction and pressed against the inserting surface Ka of the inserting portion 11.

[0058] In addition, the spring ring 40 has outward protrusions 41 at both ends, which can be moved toward each other in the direction opposite to the pressing direction of the spring ring 40 to reduce the diameter of the spring ring 40, or moved away from each other to expand the diameter of the spring ring 40. In the third embodiment, the protrusions 41 have the function of allowing the spring ring 40 to expand in diameter.

[0059] A protrusion holding portion 42 is formed on either the hole forming portion 7 or the fitting portion 11, which is in an externally fitted relationship with the other (the hole forming portion 7 in the third embodiment), to hold the protrusions 41 of the spring ring 40 so that they can move toward or away from each other (movable away in the third embodiment). The protrusion holding portion 42 is formed by partially cutting out the wall of the hole forming portion 7 in the circumferential direction so that the pair of protrusions 41 protrude outward. Note that one of the protrusions 41 may be fixed to the wall of the hole forming portion 7, and only the other protrusion 41 may be moved in a direction away from the one protrusion 41, and any suitable modification may be made.

[0060] A first circumferential groove M1 is formed in either the inserting surface Ka or the fitted surface Kb (the fitted surface Kb in the third embodiment) on the side opposite to the side pressed by the spring ring 40, into which the spring ring 40 can be inserted after being elastically deformed to have a reduced or expanded diameter (expanded diameter in the third embodiment), and a second circumferential groove M2 is formed continuously with the first circumferential groove M1 on the rear side of either the inserting surface Ka or the fitted surface Kb in the fitting release direction R relative to the other (in the third embodiment, the rear side of the fitted surface Kb in the fitting release direction R) and has a depth shallower than the diameter of the spring ring 40. That is, the second circumferential groove M2 is formed continuously with the tip side (opening edge side) of the hole 6.

[0061] In addition, a third circumferential groove M3 having a depth shallower than the diameter of the spring ring 40 is formed on the other of the inserting surface Ka and the inserted surface Kb on the side pressed by the force of the spring ring 40 (the inserting surface Ka in the third embodiment) to cooperate with the second circumferential groove M2 to hold the spring ring 40.

[0062] Further, a seal ring 70 (O-ring) that elastically contacts either the fitted surface Kb or the fitted surface Ka (the fitted surface Kb in the third embodiment) is provided in a position that does not interfere with the protruding piece holding portion 42 when the closure 10 is attached. The other configurations are the same as those described above. Therefore, the fluid device S according to the third embodiment also provides the same actions and effects as those described above.

[0063] (4) Fluid device S according to the fourth embodiment <Type 4> 12 and 13 show a fluid device S according to a fourth embodiment of the present invention. This fluid device S is a pressure reducing valve having a function of controlling the pressure reduction of a fluid, and is basically configured similarly to the fluid device S according to the third embodiment, but differs from the fluid device S according to the third embodiment in the configurations of the hole forming portion 7 of the main body 1 and the fitting portion 11 of the blocking body 10. The fitting portion 11 of the blocking body 10 is formed so as to be fitted and externally inserted into the outer surface of the hole forming portion 7 of the main body 1, and is of a female type. That is, the side of the fitting portion 11 of the blocking body 10 that forms the pressure chamber 32 is formed, for example, in a cylindrical shape having a recess, and the surface of the fitting portion 11 that fits inside or fits outside (the inner surface that fits outside in the fourth embodiment) is configured as a fitting surface Ka consisting of a circumferential surface. On the other hand, the inner surface of the hole portion 6 or the outer surface of the hole forming portion 7 (in the fourth embodiment, the outer surface of the hole forming portion 7) corresponding to the insertion surface Ka of the insertion portion 11 is configured as an insertion surface Kb consisting of a circumferential surface.

[0064] Between the insert surface Ka and the receiving surface Kb, a spring ring 40 is provided that is urged and pressed against the insert surface Ka or the receiving surface Kb along the circumferential direction (in the fourth embodiment, it is urged and pressed against the receiving surface Kb) and is elastically deformed and has a substantially C-shape similar to that of the third embodiment. That is, the spring ring 40 is of a type that is urged in the diameter-reducing direction to be pressed against the receiving surface Kb. The spring ring 40 is urged in the diameter-reducing direction to be pressed against the receiving surface Kb of the hole forming portion 7.

[0065] A protrusion holding portion 42 that holds the protrusions 41 of the spring ring 40 so that they can move toward or away from each other (movable away in the fourth embodiment) is formed on either the hole forming portion 7 or the fitting portion 11, which is in a fitted relationship with the other (the fitting portion 11 in the fourth embodiment). The protrusion holding portion 42 is formed by partially cutting out the cylindrical wall of the fitting portion 11 in the circumferential direction so that the pair of protrusions 41 protrude outward. Note that one of the protrusions 41 may be fixed to the wall of the fitting portion 11, and only the other protrusion 41 may be moved in a direction away from the one protrusion 41, and any suitable modification may be made.

[0066] A first circumferential groove M1 is formed in either the inserting surface Ka or the fitted surface Kb (the inserting surface Ka in the fourth embodiment) on the side opposite to the side pressed by the spring ring 40, into which the spring ring 40 can be inserted after being elastically deformed to have a reduced or increased diameter (in the fourth embodiment, the expanded diameter), and a second circumferential groove M2 is formed continuously with the first circumferential groove M1 on the rear side of the inserting surface Ka or the fitted surface Kb in the insertion release direction R relative to the other (in the fourth embodiment, on the rear side of the inserting surface Ka in the insertion release direction R) and has a depth shallower than the diameter of the spring ring 40. That is, the second circumferential groove M2 is formed continuously with the rear side of the inserting portion 11 in the insertion release direction R (removal direction). In addition, a third circumferential groove M3 having a depth shallower than the diameter of the spring ring 40 is formed on the other of the insertion surface Ka and the inserted surface Kb on the side pressed by the force of the spring ring 40 (in the fourth embodiment, the inserted surface Kb of the hole forming portion 7) which cooperates with the second circumferential groove M2 to hold the spring ring 40.

[0067] Further, a seal ring 70 (O-ring) that elastically contacts the other of the fitted surface Kb and the fitted surface Ka (fitted surface Ka in the fourth embodiment) is provided in a position that does not interfere with the protruding piece holding portion 42 when the closure 10 is attached (fitted surface Kb in the fourth embodiment). The other configurations are the same as those described above. Therefore, the fluid device S according to the second embodiment also provides the same actions and effects as those described above.

[0068] FIG. 14 shows another example of the spacing means 60. The spacing means 60 shown in FIG. 14(a) is configured using a screw mechanism similar to the above, and is configured with a nut 80 that abuts against the mutually facing surfaces of either the one convex portion 50 or the other convex portion 51, and a bolt 81 that is screwed into the nut 80 and has a head that abuts against the mutually facing surfaces of either the one convex portion 50 or the other convex portion 51. By adjusting the relative screwing of the nut 80 and the bolt 81, a force can be releasably applied in a direction to separate the one convex portion 50 and the other convex portion 51 from each other. The spacing means 60 shown in FIG. 14(b) is configured with a coil spring 82 that is interposed between the mutually facing surfaces of the one convex portion 50 and the other convex portion 51. By interposing the coil spring 82, a force can be applied in a direction to separate the one convex portion 50 and the other convex portion 51 from each other, and the force can be released by removing the coil spring 82. The spacing means 60 is not limited to the above-mentioned configuration, but may have any configuration and may be modified as appropriate.

[0069] In the above embodiment, the present invention is applied to a pressure reducing valve that reduces pressure by controlling the opening and closing of the control valve 21. However, the present invention can also be applied to other fluid devices, such as a steam trap that automatically discharges steam as a fluid, or a strainer that holds a screen replaceably from a hole and closes the hole with a lid as a blocking body. In short, the present invention can be applied to any fluid device that includes a main body having a hole communicating with a fluid flow path and a blocking body that is detachably attached to the main body and blocks the hole when attached. In addition, the present invention can be applied to various fluids such as oil, not limited to water and steam. Those skilled in the art can easily make many modifications to these exemplary embodiments without substantially departing from the novel teachings and effects of the present invention, and many such modifications are included in the scope of the present invention. [Explanation of symbols]

[0070] S Fluid device 1 Main unit 2 entrance 3 exit 4 Flow Path Q axis P center line 5 Outer hole 6 Hole 7 Hole forming part 10 Obstruction body 11 Insertion part 12 Wall 20 Control valve section 21 Control valve 22 Rod 23 Side hole 24 Cylindrical body 25 Bearings 26 Valve seat 27 Partition Wall 28 Inner hole 30 Diaphragm 31 Communication path 32 Pressure Chamber 33 Lid 34 Coil spring 35 Adjustment bolt 36 Lock nut 37 Volts Ka Insertion surface Kb Fitting surface 40 Spring ring 41 Projection piece 42 Projection holding part M1 First Groove M2 Second Circumferential Groove M3 3rd Circumference Groove D Spring ring diameter Ha Depth of the first circumferential groove La Width of the first circumferential groove Hb Depth of the second circumferential groove Lb Width of the second circumferential groove K Depth of the third circumferential groove J Width of the third groove 50 One side protrusion 51 Other convex part 60 Separation means 61 Female thread 62 Male thread 63 Volts 70 Seal ring (O-ring) 80 Nut 81 Volts 82 Coil spring

Claims

1. A fluid device comprising: a main body having a flow path for a fluid and a hole forming portion in which a hole communicating with the flow path is formed; and a closing body that is detachably provided on the main body and closes the hole when the closing body is attached, a fitting portion is provided in the blocking body, the fitting portion being fitted into the inner surface of the hole portion to fit therein or the outer surface of the hole forming portion to fit therein, the inner surface of the fitting portion being a fitting surface formed of a circumferential surface, and the inner surface of the hole portion or the outer surface of the hole forming portion corresponding to the fitting surface of the fitting portion being a fitted surface formed of a circumferential surface, a substantially C-shaped spring ring is provided between the inserting surface and the receiving surface along a circumferential direction thereof, the spring ring being biased against the inserting surface or the receiving surface and elastically deformed; a first circumferential groove into which the spring ring, which has been elastically deformed to have a reduced or increased diameter, can be inserted on one of the inserting surface and the inserted surface opposite to the side pressed by the urging force of the spring ring; and a second circumferential groove, which is continuous with the first circumferential groove and is provided on the rear side of the inserting surface and the inserted surface relative to the other in a direction in which the spring ring is released from the inserting surface and the inserted surface, and has a depth shallower than the diameter of the spring ring; a third circumferential groove having a depth shallower than a diameter of the spring ring that cooperates with the second circumferential groove to hold the spring ring in the other of the fitting surface and the fitted surface that is pressed by the spring ring; a plurality of one-side projections are provided at equal angular intervals around a central axis of the hole on the outside of the hole forming portion, and a plurality of other-side projections are provided on the outside of the blocking body so as to face the one-side projections; A fluid device characterized in that it is configured with a spacing means provided for each pair of the one convex portion and the opposing other convex portion, which applies a force in a direction to separate the one convex portion and the other convex portion of each pair from each other, and which cooperates with the wall surface constituting the second circumferential groove and the wall surface constituting the third circumferential groove to clamp the spring ring.

2. The spring ring has outward protrusions at both ends which can be moved toward each other in a direction opposite to the pressing direction of the spring ring due to the urging force of the spring ring to reduce the diameter of the spring ring or moved away from each other to increase the diameter of the spring ring, A fluid device as described in claim 1, characterized in that a protrusion holding portion is formed on either the hole forming portion or the fitting portion, which is in an externally fitted relationship with the other, for holding the protrusion of the spring ring so that it can move toward or away from the other.

3. The fluid device according to claim 2, characterized in that a seal ring that elastically contacts either the inserted surface or the inserting surface is provided on one of the inserted surface and the inserting surface at a position that does not interfere with the protrusion holding portion when the closure body is installed.

4. The diameter of the spring ring is D. The depth of the first circumferential groove is Ha, The width of the first circumferential groove is La, The depth of the second circumferential groove is Hb. The width of the second circumferential groove is Lb. The depth of the third circumferential groove is K. The width of the third circumferential groove is J, When D<Ha, D<La, 0.5D<Hb<D, 0.5D<K<D, 0.5D<Lb, D<J, 4. The fluid device according to claim 1, wherein the pressure is set to 0.

5.

5. The fluid device according to claim 4, characterized in that the spacing means is configured to include a penetrating female thread formed in either one of the one convex portion or the other convex portion and having an axis parallel to the axis of the hole portion, and a bolt having a male thread that screws into the female thread and abuts the other of the two convex portions, and that, when screwed in, applies a force in a direction to separate the one convex portion and the other convex portion from each other.

6. 6. The fluid device according to claim 5, wherein the bolt is a manually operable wing bolt.

7. 7. A fluid device according to claim 6, wherein a pair of said one protrusion and said other protrusion facing said one protrusion are provided at 180° symmetrical positions about a central axis of said hole.

Images