JP2016035270A - Pulsation reduction mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably reduce pulsation of fluid.SOLUTION: In a pulsation reduction mechanism, multiple pulsation reduction members 10 with an orifice 10b positioned eccentrically when viewed from an axial direction of piping 100 are arranged axially inside the piping 100 through which the fluid flows, and rotation prevention means (which comprises an elastic member 11; a pressing member 90; and a receiving part 103b) is provided to prevent the multiple pulsation reduction members 10 from rotating relatively to one another in a circumferential direction.SELECTED DRAWING: Figure 1A

Description

本発明は、配管内を流れる流体の脈動を低減するための脈動低減機構に関する。   The present invention relates to a pulsation reducing mechanism for reducing pulsation of fluid flowing in a pipe.

配管内を流れる流体に生じる脈動は、当該配管に接続されているアクチュエータや計測器等の動作に悪影響を及ぼしたり、振動を発生させたりするおそれがあるので、このような脈動はできるだけ低減することが好ましい。そこで、配管中にオリフィスを設けることで、脈動を低減することが考えられる。しかしながら、流体中に異物が含まれるような場合には、オリフィスが異物によって閉塞されることもあり得るため、オリフィスの径を小さくして、流体の脈動を低減させることにも限界がある。   The pulsation generated in the fluid flowing in the piping may adversely affect the operation of actuators and measuring instruments connected to the piping, and may cause vibration. Is preferred. Therefore, it is conceivable to reduce pulsation by providing an orifice in the pipe. However, when foreign matter is contained in the fluid, the orifice may be blocked by the foreign matter, and there is a limit to reducing the pulsation of the fluid by reducing the diameter of the orifice.

そこで、例えば特許文献１に記載されている脈動低減機構を採用することが考えられる。この脈動低減機構は、偏心した位置にオリフィスが形成された脈動低減部材（カラー）を複数設け、オリフィスの位置が軸方向に沿って上下交互となるように脈動低減部材を配設することで、脈動の低減を図ったものである。こうすれば、異物が閉塞されない程度にオリフィスの径を大きくしたとしても、脈動低減効果を向上させることができる。   Thus, for example, it is conceivable to employ a pulsation reduction mechanism described in Patent Document 1. This pulsation reduction mechanism is provided with a plurality of pulsation reduction members (collars) in which orifices are formed at eccentric positions, and by arranging the pulsation reduction members so that the positions of the orifices are alternated vertically along the axial direction, This is intended to reduce pulsation. In this way, even if the orifice diameter is increased to such an extent that foreign matter is not blocked, the effect of reducing pulsation can be improved.

実開昭６４−４８４９８号公報Japanese Utility Model Publication No. 64-48498

しかしながら、特許文献１に記載の脈動低減機構においては、脈動低減部材（カラー）が流体圧により周方向に回転してしまう場合がある。特に脈動が発生しているときには、このような回転が生じやすいと考えられる。複数の脈動低減部材が相対回転した結果、軸方向に沿って上下交互に並んでいたオリフィスの位置関係が変化すると、当初予定されていた脈動低減効果が得られなくおそれがある。   However, in the pulsation reduction mechanism described in Patent Document 1, the pulsation reduction member (collar) may rotate in the circumferential direction due to fluid pressure. It is considered that such rotation is likely to occur particularly when pulsation occurs. As a result of the relative rotation of the plurality of pulsation reducing members, if the positional relationship between the orifices arranged alternately in the vertical direction along the axial direction changes, the originally planned pulsation reduction effect may not be obtained.

本発明は、上記課題に鑑みてなされたものであり、オリフィスが形成された脈動低減部材を複数設けた脈動低減機構において、流体の脈動を安定的に低減することを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to stably reduce pulsation of a fluid in a pulsation reduction mechanism provided with a plurality of pulsation reduction members in which orifices are formed.

上記目的を達成するため、本発明にかかる脈動低減機構は、流体が流れる配管内に、前記配管の軸方向から見て偏心した位置にオリフィスを有する脈動低減部材が、前記軸方向に複数配設されており、前記複数の脈動低減部材が周方向に相対回転することを防止する回転防止手段が設けられたことを特徴とする。   In order to achieve the above object, a pulsation reducing mechanism according to the present invention includes a plurality of pulsation reducing members having an orifice in an eccentric position when viewed from the axial direction of a pipe in a pipe through which a fluid flows. And a rotation preventing means for preventing the plurality of pulsation reducing members from relatively rotating in the circumferential direction.

本発明にかかる脈動低減機構には、配管の軸方向に複数設けられた脈動低減部材が、周方向に相対回転することを防止する回転防止手段が設けられている。このため、軸方向から見て偏心した位置にオリフィスが形成された複数の脈動低減部材を、例えばオリフィスの位置が軸方向に沿って上下交互となるように組み付けを行えば、その後もこの状態を維持することができる。したがって、当初の予定通りの脈動低減効果を持続的に得ることができ、流体の脈動を安定的に低減することが可能となる。   The pulsation reducing mechanism according to the present invention is provided with rotation preventing means for preventing a plurality of pulsation reducing members provided in the axial direction of the pipe from rotating relative to each other in the circumferential direction. For this reason, if a plurality of pulsation reducing members having orifices formed at eccentric positions when viewed from the axial direction are assembled so that the positions of the orifices are alternated vertically along the axial direction, this state is maintained thereafter. Can be maintained. Therefore, the pulsation reduction effect as originally scheduled can be continuously obtained, and the pulsation of the fluid can be stably reduced.

第１実施形態にかかる脈動低減機構を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pulsation reduction mechanism concerning 1st Embodiment. 雄ネジ部材を図１Ａの左側から見た図である。It is the figure which looked at the external thread member from the left side of FIG. 1A. 第１実施形態の脈動低減部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the pulsation reduction member of 1st Embodiment. 第２実施形態にかかる脈動低減機構を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pulsation reduction mechanism concerning 2nd Embodiment. 図３ＡのＡ−Ａにおける断面図である。It is sectional drawing in AA of FIG. 3A. 第２実施形態の脈動低減部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the pulsation reduction member of 2nd Embodiment. 第３実施形態にかかる脈動低減機構を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pulsation reduction mechanism concerning 3rd Embodiment. 脈動低減部材を図５Ａの右側から見た斜視図である。It is the perspective view which looked at the pulsation reduction member from the right side of FIG. 5A. 脈動低減部材を図５Ａの左側から見た斜視図である。It is the perspective view which looked at the pulsation reduction member from the left side of FIG. 5A. 他の実施形態にかかる脈動低減機構を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pulsation reduction mechanism concerning other embodiment.

［第１実施形態］
本発明にかかる脈動低減機構の実施形態について、図面を参照しつつ説明する。図１Ａは、第１実施形態にかかる脈動低減機構を示す縦断面図である。第１実施形態の脈動低減機構は、継手部材１００の軸方向（以下、単に「軸方向」と称する）に沿って、複数の脈動低減部材１０が配設されることで構成されている。 [First Embodiment]
An embodiment of a pulsation reducing mechanism according to the present invention will be described with reference to the drawings. FIG. 1A is a longitudinal sectional view showing a pulsation reducing mechanism according to the first embodiment. The pulsation reducing mechanism of the first embodiment is configured by arranging a plurality of pulsation reducing members 10 along the axial direction of the joint member 100 (hereinafter simply referred to as “axial direction”).

（継手部材）
継手部材１００は、軸方向の一方側（図１Ａの左側）に形成され、内部に複数の脈動低減部材１０が配置される円筒状の小径部１０１と、軸方向の他方側（図１Ａの右側）に形成された円筒状の大径部１０２と、小径部１０１と大径部１０２との間に位置する接続部１０３とを有する。小径部１０１の円筒空間と大径部１０２の円筒空間とは、接続部１０３に形成されたオリフィス１０３ａによって連通しており、流体が継手部材１００内を流通可能となっている。 (Fitting member)
The joint member 100 is formed on one side in the axial direction (left side in FIG. 1A), and has a cylindrical small diameter portion 101 in which a plurality of pulsation reducing members 10 are disposed, and the other side in the axial direction (right side in FIG. 1A). ) Formed in the cylindrical large diameter portion 102, and the connection portion 103 positioned between the small diameter portion 101 and the large diameter portion 102. The cylindrical space of the small-diameter portion 101 and the cylindrical space of the large-diameter portion 102 are communicated with each other by an orifice 103 a formed in the connection portion 103 so that fluid can flow through the joint member 100.

小径部１０１の外周面のほぼ全域には、雄ネジ部１０１ａが形成されており、ここに雌ネジ部を有する不図示の管の端部が螺合される。また、小径部１０１の内周面の先端部（図１Ａの左端部）には、雌ネジ部１０１ｂが形成されており、ここに後述の雄ネジ部材９０が螺合される。一方、大径部１０２の内周面のほぼ全域には、雌ネジ部１０２ａが形成されており、ここに雄ネジ部を有する不図示の管の端部が螺合される。接続部１０３は、小径部１０１と大径部１０２との間に位置する部位となっており、軸方向から見て中心（以下、単に「中心」と称する）にオリフィス１０３ａが形成された壁部１０３ｂにより、流路が絞られている。   A male threaded portion 101a is formed almost all over the outer peripheral surface of the small-diameter portion 101, and an end portion of a tube (not shown) having a female threaded portion is screwed therein. Further, a female screw portion 101b is formed at the tip end portion (left end portion in FIG. 1A) of the inner peripheral surface of the small diameter portion 101, and a male screw member 90 described later is screwed thereto. On the other hand, a female screw portion 102a is formed in almost the entire inner peripheral surface of the large diameter portion 102, and an end portion of a tube (not shown) having a male screw portion is screwed therein. The connecting portion 103 is a portion located between the small-diameter portion 101 and the large-diameter portion 102, and is a wall portion in which an orifice 103a is formed at the center (hereinafter simply referred to as “center”) when viewed from the axial direction. The flow path is narrowed by 103b.

（脈動低減部材）
脈動低減部材１０は、有底円筒状の部材であり、その中心軸が継手部材１００の中心軸にほぼ一致するように、継手部材１００の小径部１０１内に、軸方向に沿って複数（ここでは４つ）配置される。脈動低減部材１０には、円筒状の流通空間１０ａ、および軸方向に貫通するオリフィス１０ｂが形成されており、流体が脈動低減部材１０を軸方向に流通できるようになっている。なお、図が煩雑になることを避けるため、符号を一部の脈動低減部材１０にしか付していない部位もあるが、各脈動低減部材１０は同一の構成である。 (Pulsation reduction member)
The pulsation reducing member 10 is a bottomed cylindrical member, and a plurality (herein) are provided along the axial direction in the small-diameter portion 101 of the joint member 100 so that the central axis substantially coincides with the central axis of the joint member 100. Then four) are arranged. The pulsation reducing member 10 is formed with a cylindrical flow space 10a and an orifice 10b penetrating in the axial direction so that fluid can flow through the pulsation reducing member 10 in the axial direction. In addition, in order to avoid that a figure becomes complicated, although the code | symbol is attached | subjected only to the one part pulsation reduction member 10, each pulsation reduction member 10 is the same structure.

オリフィス１０ｂは、軸方向から見て偏心した位置に形成されており、一の脈動低減部材１０のオリフィス１０ｂが、隣接する脈動低減部材１０のオリフィス１０ｂと軸方向から見て同じ位置とならないように、各脈動低減部材１０が配置されている。ここでは、流体の脈動を効果的に低減するために、互いに隣接する脈動低減部材１０のオリフィス１０ｂが、周方向に１８０度異なる位置となるよう、軸方向に沿って上下交互に配置している。しかしながら、軸方向に沿って流路がジグザグ状となっていれば、隣接するオリフィス１０ｂの位置を周方向に１８０度異ならせることは必須ではない。   The orifice 10b is formed at an eccentric position when viewed from the axial direction, and the orifice 10b of one pulsation reducing member 10 is not located at the same position as the orifice 10b of the adjacent pulsation reducing member 10 when viewed from the axial direction. Each pulsation reducing member 10 is arranged. Here, in order to effectively reduce the pulsation of the fluid, the orifices 10b of the pulsation reducing members 10 adjacent to each other are alternately arranged up and down along the axial direction so that they are positioned 180 degrees different in the circumferential direction. . However, if the flow path has a zigzag shape along the axial direction, it is not essential that the positions of the adjacent orifices 10b differ by 180 degrees in the circumferential direction.

脈動低減部材１０の外周面のうち、流通空間１０ａの開口側の角部には、環状溝１０ｃが形成されており、この環状溝１０ｃにＯリング１１が装着される。Ｏリング１１を設けることで、継手部材１００の内周面と脈動低減部材１０の外周面との間を適切にシールすることができる。なお、環状溝１０ｃは、脈動低減部材１０の外周面のうち、流通空間１０ａの開口側とは反対側の角部に形成されてもよい。   An annular groove 10c is formed at the corner on the opening side of the circulation space 10a in the outer peripheral surface of the pulsation reducing member 10, and an O-ring 11 is attached to the annular groove 10c. By providing the O-ring 11, it is possible to appropriately seal between the inner peripheral surface of the joint member 100 and the outer peripheral surface of the pulsation reducing member 10. In addition, the annular groove 10c may be formed in the corner | angular part on the opposite side to the opening side of the circulation space 10a among the outer peripheral surfaces of the pulsation reduction member 10. FIG.

（雄ネジ部材）
雄ネジ部材９０は、脈動低減部材１０と同様に有底円筒状の部材であるが、その外周面に雄ネジ部９０ａが形成されており、継手部材１００に形成された雌ネジ部１０１ｂに螺合可能となっている。雄ネジ部材９０には、円筒状の流通空間９０ｂ、および軸方向に貫通するオリフィス９０ｃが形成されており、流体が雄ネジ部材９０を軸方向に流通できるようになっている。また、雄ネジ部材９０の外周面のうち、流通空間９０ｂの開口側の角部には、環状溝９０ｄが形成されている。この環状溝９０ｄにＯリング９１を装着した状態で、雄ネジ部材９０が雌ネジ部１０１ｂに螺合されることで、継手部材１００の内周面と雄ネジ部材９０の外周面との間を適切にシールすることができる。 (Male thread member)
The male screw member 90 is a bottomed cylindrical member similar to the pulsation reducing member 10, but has a male screw portion 90 a formed on the outer peripheral surface thereof and is screwed into the female screw portion 101 b formed on the joint member 100. Is possible. The male screw member 90 is formed with a cylindrical flow space 90b and an orifice 90c penetrating in the axial direction so that fluid can flow through the male screw member 90 in the axial direction. In addition, an annular groove 90d is formed in the outer peripheral surface of the male screw member 90 at the corner on the opening side of the circulation space 90b. With the O-ring 91 attached to the annular groove 90d, the male screw member 90 is screwed into the female screw portion 101b, so that the gap between the inner peripheral surface of the joint member 100 and the outer peripheral surface of the male screw member 90 is increased. Proper sealing is possible.

図１Ｂは、雄ネジ部材９０を図１Ａの左側から見た図である。オリフィス９０ｃは、雄ネジ部材９０の中心に形成されている。また、雄ネジ部材９０の中心部には、マイナスドライバーが係合可能な締付用溝９０ｅが形成されている。このため、マイナスドライバーを用いることで、容易に雄ネジ部材９０を雌ネジ部１０１ｂに締め付けることができる。ただし、締付用溝９０ｅは、マイナスドライバー以外の締付用工具と係合可能な形状としてもよい。   FIG. 1B is a view of the male screw member 90 as viewed from the left side of FIG. 1A. The orifice 90 c is formed at the center of the male screw member 90. A tightening groove 90e that can be engaged with a flathead screwdriver is formed at the center of the male screw member 90. For this reason, the male screw member 90 can be easily fastened to the female screw portion 101b by using a minus driver. However, the tightening groove 90e may have a shape that can be engaged with a tightening tool other than a flat-blade screwdriver.

（組み付け手順）
脈動低減部材１０の環状溝１０ｃにＯリング１１を装着し、流通空間１０ａを壁部１０３ｂ側に向けた状態で、脈動低減部材１０が継手部材１００の小径部１０１内に順次詰め込まれる。このとき、オリフィス１０ｂの位置が、上述のように軸方向に沿って上下交互となるように、脈動低減部材１０の周方向における位置が調整される。すべての脈動低減部材１０を詰め込んだ後、最後に雄ネジ部材９０を雌ネジ部１０１ｂに締め付けることで、組み付けが完了する。複数の脈動低減部材１０は、壁部１０３ｂおよび雄ネジ部材９０によって挟まれているため、軸方向への移動が規制され、流体圧によって流されてしまうことがない。 (Assembly procedure)
The O-ring 11 is attached to the annular groove 10 c of the pulsation reducing member 10, and the pulsation reducing member 10 is sequentially packed into the small diameter portion 101 of the joint member 100 with the flow space 10 a facing the wall portion 103 b. At this time, the position of the pulsation reducing member 10 in the circumferential direction is adjusted so that the position of the orifice 10b alternates vertically along the axial direction as described above. After all the pulsation reducing members 10 are packed, the assembly is completed by finally tightening the male screw member 90 to the female screw portion 101b. Since the plurality of pulsation reducing members 10 are sandwiched between the wall portion 103b and the male screw member 90, the movement in the axial direction is restricted and the pulsation reducing member 10 is not flown by the fluid pressure.

（回転防止手段）
雄ネジ部材９０を雌ネジ部１０１ｂに締め付けると、複数の脈動低減部材１０が壁部１０３ｂ側に押圧され、それに伴い、互いに隣接する脈動低減部材１０の間に設けられたＯリング１１が軸方向に圧縮する。その結果、Ｏリング１１と脈動低減部材１０との間に大きな摩擦力が発生し、Ｏリング１１を挟んで互いに隣接する脈動低減部材１０が、周方向に相対回転しないようになる。つまり、第１実施形態では、「弾性部材」としてのＯリング１１と、「押圧部材」としての雄ネジ部材９０と、雄ネジ部材９０による押圧力を受け止める「受止部」としての壁部１０３ｂとにより、複数の脈動低減部材１０の相対回転を防止する「回転防止手段」が構成されている。 (Rotation prevention means)
When the male screw member 90 is fastened to the female screw portion 101b, the plurality of pulsation reducing members 10 are pressed toward the wall portion 103b, and accordingly, the O-ring 11 provided between the pulsation reducing members 10 adjacent to each other is axially moved. Compress to As a result, a large frictional force is generated between the O-ring 11 and the pulsation reducing member 10, and the pulsation reducing members 10 adjacent to each other across the O-ring 11 are prevented from rotating relative to each other in the circumferential direction. That is, in the first embodiment, the O-ring 11 as the “elastic member”, the male screw member 90 as the “pressing member”, and the wall portion 103 b as the “receiving portion” that receives the pressing force by the male screw member 90. Thus, “rotation preventing means” for preventing relative rotation of the plurality of pulsation reducing members 10 is configured.

（効果）
第１実施形態によれば、上記回転防止手段により、複数の脈動低減部材１０の相対回転が防止される。このため、組み付け時における各オリフィス１０ｂの位置関係が維持され、当初の予定通りの脈動低減効果を持続的に得ることができるので、流体の脈動を安定的に低減することが可能となる。 (effect)
According to the first embodiment, relative rotation of the plurality of pulsation reducing members 10 is prevented by the rotation preventing means. For this reason, the positional relationship of each orifice 10b at the time of assembly is maintained, and the pulsation reducing effect as originally planned can be continuously obtained, so that the pulsation of the fluid can be stably reduced.

また、第１実施形態では、押圧部材（雄ネジ部材９０）による押圧によって弾性部材（Ｏリング１１）が軸方向に圧縮することで、複数の脈動低減部材１０の相対回転が防止される構成となっている。かかる構成によれば、弾性部材が互いに隣接する脈動低減部材１０の間に配置されていればよく、回転防止手段を構成するために、脈動低減部材１０の周方向における配置が制限されることはない。したがって、すべての脈動低減部材１０を同一形状としても、振動低減部材１０の周方向における配置を適宜調整することで、オリフィス１０ｂを軸方向に沿って上下交互に配置することができる。このように、すべての脈動低減部材１０を同一形状とすることが可能なので、複数種類の脈動低減部材１０を製造する必要がなく、製造コストを削減することができる。   Further, in the first embodiment, the elastic member (O-ring 11) is compressed in the axial direction by pressing by the pressing member (male screw member 90), thereby preventing relative rotation of the plurality of pulsation reducing members 10. It has become. According to such a configuration, the elastic member only needs to be disposed between the pulsation reducing members 10 adjacent to each other, and the arrangement of the pulsation reducing member 10 in the circumferential direction is limited in order to configure the rotation preventing means. Absent. Therefore, even if all the pulsation reducing members 10 have the same shape, the orifices 10b can be alternately arranged up and down along the axial direction by appropriately adjusting the arrangement of the vibration reducing members 10 in the circumferential direction. Thus, since all the pulsation reducing members 10 can have the same shape, it is not necessary to manufacture a plurality of types of pulsation reducing members 10, and the manufacturing cost can be reduced.

また、第１実施形態では、弾性部材をＯリング１１としているので、弾性部材を安価かつ容易に調達することができる。   In the first embodiment, since the elastic member is the O-ring 11, the elastic member can be procured inexpensively and easily.

また、第１実施形態では、脈動低減部材１０の外周面の角部に環状溝１０ｃが形成されており、この環状溝１０ｃにＯリング１１が装着されている。このように、Ｏリング１１を装着するための環状溝１０ｃを脈動低減部材１０の角部に設けることで、環状溝１０ｃの加工が容易となる。   In the first embodiment, the annular groove 10c is formed at the corner of the outer peripheral surface of the pulsation reducing member 10, and the O-ring 11 is attached to the annular groove 10c. Thus, by providing the annular groove 10c for mounting the O-ring 11 at the corner of the pulsation reducing member 10, the processing of the annular groove 10c is facilitated.

（変形例）
図２は、第１実施形態の脈動低減部材１０の変形例を示す断面図である。本変形例においては、Ｏリング１１を装着するための環状溝１０ｄが、脈動低減部材１０の外周面の角部ではなく、脈動低減部材１０のうち、流通空間１０ａの開口側の側面に形成されている。このような環状溝１０ｄにＯリング１１を装着することによっても、上述の回転防止手段を構成することが可能である。なお、環状溝１０ｄを、流通空間１０ａの開口側とは反対側の側面に形成することも可能である。また、そもそも弾性部材として環状のＯリング１１を用いることは必須ではなく、周方向の一部にのみ弾性部材を設けるようにしてもよい。 (Modification)
FIG. 2 is a cross-sectional view showing a modification of the pulsation reducing member 10 of the first embodiment. In the present modification, the annular groove 10d for mounting the O-ring 11 is formed not on the corner of the outer peripheral surface of the pulsation reducing member 10 but on the side surface of the pulsation reducing member 10 on the opening side of the circulation space 10a. ing. The above-described rotation preventing means can also be configured by mounting the O-ring 11 in such an annular groove 10d. The annular groove 10d can be formed on the side surface opposite to the opening side of the circulation space 10a. In the first place, it is not essential to use the annular O-ring 11 as an elastic member, and the elastic member may be provided only in a part in the circumferential direction.

［第２実施形態］
図３Ａは、第２実施形態にかかる脈動低減機構を示す縦断面図であり、図３Ｂは、図３ＡのＡ−Ａにおける断面図である。第２実施形態では、第１実施形態のように弾性部材ではなく、キー部材を用いることで回転防止手段を構成している。なお、第１実施形態と共通する構成については説明を省略し、第１実施形態と異なる点を中心に詳細な説明を行う。 [Second Embodiment]
FIG. 3A is a longitudinal sectional view showing a pulsation reducing mechanism according to the second embodiment, and FIG. 3B is a sectional view taken along line AA of FIG. 3A. In the second embodiment, the rotation preventing means is configured by using a key member instead of an elastic member as in the first embodiment. In addition, description is abbreviate | omitted about the structure which is common in 1st Embodiment, and it demonstrates in detail centering on a different point from 1st Embodiment.

第２実施形態の脈動低減部材２０の基本形状は、第１実施形態の脈動低減部材１０と同様に有底円筒状である。脈動低減部材２０のうち、流通空間２０ａの開口側の端部は、先端に向かうほど縮径する先細り形状のテーパー部２０ｃとなっている。このため、脈動低減部材２０を継手部材１００内に詰め込む際に、脈動低減部材２０の端面と継手部材１００の端面とが接触しにくく、組み付けを円滑に行うことができる。なお、このようなテーパー部２０ｃを設けることは必須ではない。   The basic shape of the pulsation reducing member 20 of the second embodiment is a bottomed cylindrical shape like the pulsation reducing member 10 of the first embodiment. Of the pulsation reducing member 20, the end portion on the opening side of the circulation space 20a is a tapered portion 20c having a tapered shape that decreases in diameter toward the tip. For this reason, when packing the pulsation reducing member 20 into the joint member 100, the end face of the pulsation reducing member 20 and the end face of the joint member 100 are unlikely to contact each other, and the assembly can be performed smoothly. Note that it is not essential to provide such a tapered portion 20c.

図３Ｂに示すように、脈動低減部材２０の外周面には、周方向において等間隔（ここでは９０度ごと）に、凹部２０ｄが形成されている。この凹部２０ｄには、キー部材２１が係合可能となっており、凹部２０ｄにキー部材２１を係合させることで「キー部」が構成される。凹部２０ｄは、脈動低減部材２０の外周面のうち、軸方向の全域にわたって形成されている。このため、軸方向から見たときに各脈動低減部材２０の凹部２０ｄの位置が一致するようにすれば、複数の脈動低減部材２０の凹部２０ｄが軸方向に沿って直線状に並ぶことになる。キー部材２１は、長尺状の部材であり、直線状に並んだ複数の凹部２０ｄに対して同時に係合できるだけの長さを有している。   As shown in FIG. 3B, recesses 20d are formed on the outer peripheral surface of the pulsation reducing member 20 at regular intervals (here, every 90 degrees) in the circumferential direction. The key member 21 can be engaged with the recess 20d, and the “key portion” is configured by engaging the key member 21 with the recess 20d. The recess 20 d is formed over the entire area in the axial direction on the outer peripheral surface of the pulsation reducing member 20. For this reason, if the positions of the recesses 20d of the pulsation reducing members 20 coincide with each other when viewed from the axial direction, the recesses 20d of the plurality of pulsation reducing members 20 are arranged linearly along the axial direction. . The key member 21 is a long member, and has a length that can be simultaneously engaged with the plurality of concave portions 20d arranged in a straight line.

一方、継手部材１００の小径部１０１の内周面には、軸方向に沿ってキー溝１０１ｃが形成されており、このキー溝１０１ｃにはキー部材２１が嵌合可能となっている。すなわち、キー部材２１の断面形状は、凹部２０ｄとキー溝１０１ｃとによって形成される空間とほぼ同じ断面形状となっている。このため、キー部材２１と凹部２０ｄとの間、またはキー部材２１とキー溝１０１ｃとの間には、ほとんど隙間が生じないようになっている。   On the other hand, a key groove 101c is formed along the axial direction on the inner peripheral surface of the small diameter portion 101 of the joint member 100, and the key member 21 can be fitted into the key groove 101c. That is, the cross-sectional shape of the key member 21 is substantially the same cross-sectional shape as the space formed by the recess 20d and the key groove 101c. For this reason, there is almost no gap between the key member 21 and the recess 20d, or between the key member 21 and the key groove 101c.

（組み付け手順）
複数の脈動低減部材２０を、オリフィス２０ｂが軸方向に沿って上下交互となるよう、かつすべての凹部２０ｄが直線状に並ぶように位置決めした上で、直線状に並んだすべての凹部２０ｄにキー部材２１を係合させる。そして、すべての脈動低減部材２０およびキー部材２１からなる集合体を、キー部材２１がキー溝１０１ｃに嵌合するように、継手部材１００の小径部１０１内に詰め込む。最後に雄ネジ部材９０を雌ネジ部１０１ｂに締め付けることで、組み付けが完了する。 (Assembly procedure)
A plurality of pulsation reducing members 20 are positioned so that the orifices 20b alternate vertically along the axial direction, and all the recesses 20d are arranged in a straight line, and then keyed to all the recesses 20d arranged in a straight line. The member 21 is engaged. Then, the aggregate composed of all the pulsation reducing members 20 and the key member 21 is packed into the small diameter portion 101 of the joint member 100 so that the key member 21 is fitted in the key groove 101c. Finally, the male screw member 90 is fastened to the female screw portion 101b to complete the assembly.

（回転防止手段）
キー部材２１が、すべての脈動低減部材２０の凹部２０ｄと係合するとともに、キー溝１０１ｃと嵌合することにより、脈動低減部材２０は継手部材１００に対して周方向に回転できなくなる。その結果、複数の脈動低減部材２０が周方向に相対回転することも防止可能となる。つまり、第２実施形態では、継手部材１００の内周面に形成されたキー溝１０１ｃと、脈動低減部材２０の外周面に形成された凹部２０ｄにキー部材２１を係合させることで構成される「キー部」とにより、複数の脈動低減部材２０が相対回転することを防止する「回転防止手段」が構成されている。 (Rotation prevention means)
When the key member 21 is engaged with the recesses 20 d of all the pulsation reducing members 20 and fitted with the key grooves 101 c, the pulsation reducing member 20 cannot rotate in the circumferential direction with respect to the joint member 100. As a result, it is possible to prevent the plurality of pulsation reducing members 20 from rotating in the circumferential direction. That is, in the second embodiment, the key member 21 is engaged with the key groove 101 c formed on the inner peripheral surface of the joint member 100 and the recess 20 d formed on the outer peripheral surface of the pulsation reducing member 20. The “key portion” constitutes “rotation preventing means” that prevents the plurality of pulsation reducing members 20 from rotating relative to each other.

（効果）
第２実施形態によれば、上記回転防止手段により、複数の脈動低減部材２０の相対回転が防止される。このため、組み付け時における各オリフィス２０ｂの位置関係が維持され、当初の予定通りの脈動低減効果を持続的に得ることができるので、流体の脈動を安定的に低減することが可能となる。 (effect)
According to the second embodiment, relative rotation of the plurality of pulsation reducing members 20 is prevented by the rotation preventing means. For this reason, the positional relationship of each orifice 20b at the time of assembling is maintained, and the pulsation reduction effect as originally planned can be continuously obtained, so that the pulsation of the fluid can be stably reduced.

また、第２実施形態では、脈動低減部材２０に設けられたキー部（凹部２０ｄに係合させたキー部材２１）が、継手部材１００に形成されたキー溝１０１ｃに嵌合されることで、複数の脈動低減部材２０の相対回転が防止される構成となっている。かかる構成によれば、キー部とキー溝１０１ｃとの嵌合により、確実に脈動低減部材２０の回転を防止することができる。   In the second embodiment, the key portion provided on the pulsation reducing member 20 (the key member 21 engaged with the recess 20d) is fitted into the key groove 101c formed on the joint member 100. The relative rotation of the plurality of pulsation reducing members 20 is prevented. According to such a configuration, the rotation of the pulsation reducing member 20 can be reliably prevented by fitting the key portion and the key groove 101c.

また、第２実施形態では、脈動低減部材２０の外周面に形成された凹部２０ｄにキー部材２１を係合させることでキー部を構成している。このため、キー部を簡単に形成することができる。ただし、例えば脈動低減部材２０を樹脂で作製する場合には、凹部２０ｄにキー部材２１を係合させるのではなく、成形時に外周面から突出する部位を形成し、この部位をキー部としてもよい。   In the second embodiment, the key portion is configured by engaging the key member 21 with the recess 20 d formed on the outer peripheral surface of the pulsation reducing member 20. For this reason, a key part can be formed easily. However, for example, when the pulsation reducing member 20 is made of resin, the key member 21 is not engaged with the recess 20d, but a portion protruding from the outer peripheral surface at the time of molding is formed, and this portion may be used as the key portion. .

また、第２実施形態では、凹部２０ｄが周方向に複数形成されている。このため、すべての脈動低減部材２０を同一形状としても、どの凹部２０ｄをキー部材２１と係合させるかによって、オリフィス２０ｂの位置を調整し、オリフィス２０ｂを軸方向に沿って上下交互に配置することができる。このように、すべての脈動低減部材２０を同一形状とすることが可能なので、複数種類の脈動低減部材２０を製造する必要がなく、製造コストを削減することができる。   In the second embodiment, a plurality of recesses 20d are formed in the circumferential direction. For this reason, even if all the pulsation reducing members 20 have the same shape, the position of the orifice 20b is adjusted depending on which concave portion 20d is engaged with the key member 21, and the orifices 20b are alternately arranged vertically along the axial direction. be able to. Thus, since all the pulsation reducing members 20 can have the same shape, it is not necessary to manufacture a plurality of types of pulsation reducing members 20, and the manufacturing cost can be reduced.

また、第２実施形態では、凹部２０ｄが、脈動低減部材２０の外周面のうち軸方向の全域にわたって形成されている。こうすることで、複数の脈動低減部材２０の凹部２０ｄを、軸方向に沿って連続的に直線状に配置することができ、１つのキー部材２１を複数の凹部２０ｄに係合させることができる。つまり、キー部材２１を複数用意する必要がなく、部品点数を削減することができる。   In the second embodiment, the recess 20 d is formed over the entire area in the axial direction on the outer peripheral surface of the pulsation reducing member 20. By doing so, the recesses 20d of the plurality of pulsation reducing members 20 can be continuously arranged linearly along the axial direction, and one key member 21 can be engaged with the plurality of recesses 20d. . That is, it is not necessary to prepare a plurality of key members 21, and the number of parts can be reduced.

（変形例）
図４は、第２実施形態の脈動低減部材２０の変形例を示す断面図である。本変形例においては、凹部２０ｅが、脈動低減部材２０の外周面のうち軸方向の全域にわたっては形成されておらず、軸方向の一部にのみ形成されている。そして、各脈動低減部材２０の凹部２０ｅにキー部材２２がそれぞれ係合されることで、キー部が構成される。こうすることで、キー部が各脈動低減部材２０ごとに独立して構成されることになり、脈動低減部材２０を継手部材１００内に１つずつ詰め込むことができるので、組み付けが容易となる。他にも、凹部の具体的形状や配置は適宜変更が可能であり、例えば凹部を周方向に１つだけ設けるようにしてもよい。 (Modification)
FIG. 4 is a cross-sectional view showing a modification of the pulsation reducing member 20 of the second embodiment. In this modification, the recess 20e is not formed over the entire area in the axial direction on the outer peripheral surface of the pulsation reducing member 20, but is formed only in a part in the axial direction. And the key part is comprised because the key member 22 is each engaged with the recessed part 20e of each pulsation reduction member 20. FIG. By doing so, the key portion is configured independently for each pulsation reducing member 20, and the pulsation reducing members 20 can be packed into the joint member 100 one by one, so that assembly is facilitated. In addition, the specific shape and arrangement of the recesses can be appropriately changed. For example, only one recess may be provided in the circumferential direction.

［第３実施形態］
図５Ａは、第３実施形態にかかる脈動低減機構を示す縦断面図であり、図５Ｂは、脈動低減部材３０を図５Ａの右側から見た斜視図であり、図５Ｃは、脈動低減部材３０を図５Ａの左側から見た斜視図である。第３実施形態では、互いに隣接する脈動低減部材３０の対向面に係合機構を設けることで、回転防止手段を構成している。なお、第１実施形態と共通する構成については説明を省略し、第１実施形態と異なる点を中心に詳細な説明を行う。 [Third Embodiment]
FIG. 5A is a longitudinal sectional view showing a pulsation reducing mechanism according to the third embodiment, FIG. 5B is a perspective view of the pulsation reducing member 30 as viewed from the right side of FIG. 5A, and FIG. 5C is a pulsation reducing member 30. It is the perspective view which looked at from the left side of FIG. 5A. In the third embodiment, an anti-rotation means is configured by providing an engagement mechanism on the opposing surfaces of the pulsation reducing members 30 adjacent to each other. In addition, description is abbreviate | omitted about the structure which is common in 1st Embodiment, and it demonstrates in detail centering on a different point from 1st Embodiment.

第３実施形態の脈動低減部材３０の基本形状は、第１実施形態の脈動低減部材１０と同様に有底円筒状である。脈動低減部材３０のうち流通空間３０ａの開口側の側面には、図５Ｂに示すように、周方向において等間隔（ここでは９０度ごと）に、凹部３０ｃが形成されている。一方、脈動低減部材３０のうち流通空間３０ａの開口側とは反対側の側面には、図５Ｃに示すように、周方向において等間隔（ここでは９０度ごと）に、凸部３０ｄが形成されている。凹部３０ｃと凸部３０ｄとは互いに係合可能な形状となっている。このように、脈動低減部材３０は比較的複雑な形状であるので、樹脂成形により作製することが好ましいが、樹脂製であることは必須ではない。   The basic shape of the pulsation reducing member 30 of the third embodiment is a bottomed cylindrical shape like the pulsation reducing member 10 of the first embodiment. As shown in FIG. 5B, concave portions 30c are formed on the side surface of the pulsation reducing member 30 on the opening side of the circulation space 30a at regular intervals (here, every 90 degrees) in the circumferential direction. On the other hand, on the side surface of the pulsation reducing member 30 opposite to the opening side of the circulation space 30a, as shown in FIG. 5C, convex portions 30d are formed at regular intervals (here, every 90 degrees) in the circumferential direction. ing. The concave portion 30c and the convex portion 30d have shapes that can be engaged with each other. Thus, since the pulsation reducing member 30 has a relatively complicated shape, it is preferable that the pulsation reducing member 30 be made by resin molding, but it is not essential to be made of resin.

互いに隣接する２つの脈動低減部材３０に着目すると、一方の脈動低減部材３０のうち他方の脈動低減部材３０に対向する面には凹部３０ｃ（または凸部３０ｄ）が形成されており、他方の脈動低減部材３０のうち一方の脈動低減部材３０に対向する面には凸部３０ｄ（または凹部３０ｃ）が形成されていることになる。つまり、互いに隣接する脈動低減部材３０は、対向面に形成された凹部３０ｃと凸部３０ｄとを係合させることによって、周方向に相対回転できないものとなる。   When attention is paid to two pulsation reducing members 30 adjacent to each other, a concave portion 30c (or a convex portion 30d) is formed on the surface of one pulsation reducing member 30 facing the other pulsation reducing member 30, and the other pulsation is reduced. A convex portion 30 d (or a concave portion 30 c) is formed on the surface of the reducing member 30 that faces one of the pulsation reducing members 30. That is, the pulsation reducing members 30 adjacent to each other cannot be rotated relative to each other in the circumferential direction by engaging the concave portions 30c and the convex portions 30d formed on the opposing surfaces.

（組み付け手順）
複数の脈動低減部材３０を、オリフィス３０ｂが軸方向に沿って上下交互となるよう、かつ互いに隣接する脈動低減部材３０の対向面に形成された凹部３０ｃと凸部３０ｄとを係合させた状態で、複数の脈動低減部材３０を継手部材１００の小径部１０１内に詰め込む。最後に雄ネジ部材９０を雌ネジ部１０１ｂに締め付けることで、組み付けが完了する。 (Assembly procedure)
A state in which the plurality of pulsation reducing members 30 are engaged with the concave portions 30c and the convex portions 30d formed on the opposing surfaces of the pulsation reducing members 30 adjacent to each other so that the orifices 30b are alternately arranged along the axial direction. Thus, the plurality of pulsation reducing members 30 are packed into the small diameter portion 101 of the joint member 100. Finally, the male screw member 90 is fastened to the female screw portion 101b to complete the assembly.

（回転防止手段）
互いに隣接する脈動低減部材３０の対向面に形成された凹部３０ｃと凸部３０ｄとを係合させることにより、複数の脈動低減部材３０が周方向に相対回転しなくなる。つまり、第３実施形態では、互いに隣接する２つの脈動低減部材３０において、一方の脈動低減部材３０のうち他方の脈動低減部材３０に対向する面に形成された「第１係合部」としての凹部３０ｃ（または凸部３０ｄ）と、他方の脈動低減部材３０のうち一方の脈動低減部材３０に対向する面に形成された「第２係合部」としての凸部３０ｄ（または凹部３０ｃ）とにより、複数の脈動低減部材３０が相対回転することを防止する「回転防止手段」が構成されている。なお、凹部３０ｃおよび凸部３０ｄの具体的形状や配置は変更が可能であるし、脈動低減部材３０のうちいずれの側面に凹部または凸部を形成するかも自由である。 (Rotation prevention means)
By engaging the concave portions 30c and the convex portions 30d formed on the opposing surfaces of the pulsation reducing members 30 adjacent to each other, the plurality of pulsation reducing members 30 do not rotate relative to each other in the circumferential direction. That is, in the third embodiment, in the two pulsation reducing members 30 adjacent to each other, the “first engaging portion” formed on the surface of the one pulsation reducing member 30 that faces the other pulsation reducing member 30. A concave portion 30c (or a convex portion 30d) and a convex portion 30d (or a concave portion 30c) as a “second engaging portion” formed on a surface of the other pulsation reducing member 30 facing the pulsation reducing member 30; Thus, “rotation preventing means” for preventing the plurality of pulsation reducing members 30 from rotating relative to each other is configured. It should be noted that the specific shapes and arrangements of the concave portions 30c and the convex portions 30d can be changed, and it is also free to form concave portions or convex portions on any side surface of the pulsation reducing member 30.

（効果）
第３実施形態によれば、上記回転防止手段により、複数の脈動低減部材３０の相対回転が防止される。このため、組み付け時における各オリフィス３０ｂの位置関係が維持され、当初の予定通りの脈動低減効果を持続的に得ることができるので、流体の脈動を安定的に低減することが可能となる。なお、第３実施形態では、複数の脈動低減部材３０の相対回転は確実に防止できるものの、複数の脈動低減部材３０が一体となって周方向に回転する可能性はある。しかしながら、複数の脈動低減部材３０が一体回転しても、各オリフィス３０ｂの相対的な位置関係は維持されるため、当初の予定通りの脈動低減効果を持続的に得ることができることには変わりがない。さらに、第３実施形態によれば、弾性部材やキー部材を別途用意する必要がないので、部品点数を削減することができる。 (effect)
According to the third embodiment, relative rotation of the plurality of pulsation reducing members 30 is prevented by the rotation preventing means. For this reason, the positional relationship of the orifices 30b at the time of assembly is maintained, and the pulsation reduction effect as originally planned can be obtained continuously, so that the pulsation of the fluid can be stably reduced. In the third embodiment, although the relative rotation of the plurality of pulsation reducing members 30 can be reliably prevented, there is a possibility that the plurality of pulsation reducing members 30 rotate together in the circumferential direction. However, even if the plurality of pulsation reducing members 30 rotate integrally, the relative positional relationship between the orifices 30b is maintained, so that the pulsation reducing effect as originally planned can be continuously obtained. Absent. Furthermore, according to the third embodiment, there is no need to separately prepare an elastic member or a key member, so that the number of parts can be reduced.

また、第３実施形態では、第１係合部としての凹部３０ｃ（または凸部３０ｄ）が、周方向に複数形成されるとともに、第２係合部としての凸部３０ｄ（または凹部３０ｃ）が、凹部３０ｃ（または凸部３０ｄ）と対応して周方向に複数形成されている。このため、凹部３０ｃと凸部３０ｄとの係合箇所が複数となり、係合力を向上させることができる。   In the third embodiment, a plurality of concave portions 30c (or convex portions 30d) as first engaging portions are formed in the circumferential direction, and convex portions 30d (or concave portions 30c) as second engaging portions are formed. A plurality of recesses 30c (or projections 30d) are formed in the circumferential direction corresponding to the recesses 30c (or the projections 30d). For this reason, the engaging part of the recessed part 30c and the convex part 30d becomes multiple, and an engaging force can be improved.

さらに、第３実施形態では、第１係合部としての凹部３０ｃ（または凸部３０ｄ）が、周方向に等間隔に複数形成されるとともに、第２係合部としての凸部３０ｄ（または凹部３０ｃ）が、周方向に凹部３０ｃ（または凸部３０ｄ）と同じ間隔で同数形成されている。このため、互いに隣接する脈動低減部材３０の周方向における相対位置を、上記間隔ごとに変更することができる。つまり、すべての脈動低減部材３０が同一形状であったとしても、脈動低減部材３０の周方向における配置を適宜調整することで、オリフィス３０ｂを軸方向に沿って上下交互に配置することができる。このように、すべての脈動低減部材３０を同一形状とすることが可能なので、複数種類の脈動低減部材３０を製造する必要がなく、製造コストを削減することができる。   Further, in the third embodiment, a plurality of concave portions 30c (or convex portions 30d) as first engaging portions are formed at equal intervals in the circumferential direction, and convex portions 30d (or concave portions as second engaging portions). 30c) is formed in the circumferential direction in the same number as the concave portion 30c (or the convex portion 30d) at the same interval. For this reason, the relative position in the circumferential direction of the pulsation reducing members 30 adjacent to each other can be changed at each interval. That is, even if all the pulsation reducing members 30 have the same shape, the orifices 30b can be alternately arranged vertically along the axial direction by appropriately adjusting the arrangement of the pulsation reducing members 30 in the circumferential direction. Thus, since all the pulsation reducing members 30 can have the same shape, it is not necessary to manufacture a plurality of types of pulsation reducing members 30, and the manufacturing cost can be reduced.

（その他の実施形態）
本発明は上記実施形態に限定されるものではなく、その趣旨を逸脱しない限りにおいて上記実施形態の要素を適宜組み合わせまたは種々の変更を加えることが可能である。 (Other embodiments)
The present invention is not limited to the above embodiment, and the elements of the above embodiment can be appropriately combined or variously modified without departing from the spirit of the present invention.

例えば、上記の各実施形態では、脈動低減部材１０、２０、３０が設けられる配管が継手部材１００の場合について説明をしているが、脈動低減部材１０、２０、３０が設けられる対象は継手部材１００に限定されない。すなわち、本発明における「配管」とは、流体が内部を流れる管状のものを意味し、継手部材１００以外にも、単なる管やホース等に脈動低減部材１０、２０、３０を設けて脈動低減機構を構成してもよい。   For example, in each of the above-described embodiments, the case where the piping in which the pulsation reducing members 10, 20, and 30 are provided is the joint member 100, but the object to be provided with the pulsation reducing members 10, 20, and 30 is the joint member. It is not limited to 100. In other words, the “pipe” in the present invention means a tubular pipe in which a fluid flows, and in addition to the joint member 100, a pulsation reducing mechanism is provided by providing pulsation reducing members 10, 20, and 30 on simple pipes and hoses. May be configured.

また、継手部材１００に本発明の脈動低減機構を適用する場合であっても、継手部材１００の形状は適宜変更が可能である。例えば、図６に示すような継手部材２００を用いることも可能である。この継手部材２００は、中心にオリフィス２０１ｄを有する壁部２０１ｃを、小径部２０１と大径部２０２との間ではなく、小径部２０１の先端部（図６の左端部）に形成したものである。ただし、継手部材２００では、第１実施形態の継手部材１００よりも脈動低減部材１０を詰め込む距離が長くなるため、組み付け時の効率の点からは、第１実施形態のほうが好ましい。   Even when the pulsation reducing mechanism of the present invention is applied to the joint member 100, the shape of the joint member 100 can be changed as appropriate. For example, a joint member 200 as shown in FIG. 6 can be used. In this joint member 200, a wall 201c having an orifice 201d at the center is formed not at a position between the small diameter portion 201 and the large diameter portion 202 but at a tip end portion (left end portion in FIG. 6) of the small diameter portion 201. . However, in the joint member 200, the distance for packing the pulsation reducing member 10 is longer than that in the joint member 100 of the first embodiment. Therefore, the first embodiment is preferable from the viewpoint of efficiency during assembly.

また、継手部材１００、２００あるいは雄ネジ部材９０において、中心にオリフィスを設けることは必須ではない。例えば、中心以外の位置にオリフィスを形成してもよいし、一般的なオリフィスよりも径の大きな貫通孔を代わりに形成してもよい。   Further, it is not essential to provide an orifice at the center of the joint members 100 and 200 or the male screw member 90. For example, an orifice may be formed at a position other than the center, or a through hole having a diameter larger than that of a general orifice may be formed instead.

１０、２０、３０：脈動低減部材
１０ｂ、２０ｂ、３０ｂ：オリフィス
１０ｃ：環状溝
１１：Ｏリング（弾性部材）
２０ｄ、２０ｅ：凹部
２１、２２：キー部材（キー部）
３０ｃ：凹部（第１係合部または第２係合部）
３０ｄ：凸部（第２係合部または第１係合部）
９０：雄ネジ部材（押圧部材）
１００、２００：継手部材（配管）
１０１ｃ：キー溝
１０３ｂ：壁部（受止部） 10, 20, 30: Pulsation reducing member 10b, 20b, 30b: Orifice 10c: Annular groove 11: O-ring (elastic member)
20d, 20e: recessed portion 21, 22: key member (key portion)
30c: Concave portion (first engaging portion or second engaging portion)
30d: convex portion (second engaging portion or first engaging portion)
90: Male screw member (pressing member)
100, 200: Joint member (piping)
101c: Keyway 103b: Wall (receiving part)

Claims (11)

流体が流れる配管内に、前記配管の軸方向から見て偏心した位置にオリフィスを有する脈動低減部材が、前記軸方向に複数配設されており、
前記複数の脈動低減部材が周方向に相対回転することを防止する回転防止手段が設けられたことを特徴とする脈動低減機構。 A plurality of pulsation reducing members having an orifice at an eccentric position as viewed from the axial direction of the pipe are arranged in the axial direction in the pipe through which the fluid flows,
A pulsation reducing mechanism comprising a rotation preventing means for preventing the plurality of pulsation reducing members from rotating relative to each other in the circumferential direction. 前記回転防止手段は、
前記複数の脈動低減部材のうち互いに隣接する脈動低減部材の間に設けられた弾性部材と、
前記軸方向において前記複数の脈動低減部材の一方側に設けられ、前記複数の脈動低減部材を他方側に押圧する押圧部材と、
前記複数の脈動低減部材の前記他方側に設けられ、前記押圧部材による押圧力を受け止める受止部と、
を有し、
前記押圧部材による押圧によって前記弾性部材が前記軸方向に圧縮することで、前記複数の脈動低減部材の相対回転が防止される請求項１に記載の脈動低減機構。 The rotation preventing means is
An elastic member provided between pulsation reduction members adjacent to each other among the plurality of pulsation reduction members;
A pressing member provided on one side of the plurality of pulsation reducing members in the axial direction and pressing the plurality of pulsation reducing members to the other side;
A receiving portion that is provided on the other side of the plurality of pulsation reducing members and receives a pressing force by the pressing member;
Have
The pulsation reducing mechanism according to claim 1, wherein the elastic member is compressed in the axial direction by pressing by the pressing member, thereby preventing relative rotation of the plurality of pulsation reducing members. 前記弾性部材はＯリングである請求項２に記載の脈動低減機構。   The pulsation reducing mechanism according to claim 2, wherein the elastic member is an O-ring. 前記脈動低減部材の外周面の角部に環状溝が形成されており、前記環状溝に前記Ｏリングが装着される請求項３に記載の脈動低減機構。   The pulsation reducing mechanism according to claim 3, wherein an annular groove is formed at a corner of the outer peripheral surface of the pulsation reducing member, and the O-ring is attached to the annular groove. 前記回転防止手段は、
前記配管の内周面に前記軸方向に沿って形成されたキー溝と、
前記脈動低減部材の外周面に設けられ、前記キー溝と嵌合可能なキー部と、
を有し、
前記キー部が前記キー溝に嵌合されることで、前記複数の脈動低減部材の相対回転が防止される請求項１に記載の脈動低減機構。 The rotation preventing means is
A keyway formed along the axial direction on the inner peripheral surface of the pipe;
A key portion that is provided on an outer peripheral surface of the pulsation reducing member, and is engageable with the key groove;
Have
The pulsation reduction mechanism according to claim 1, wherein relative rotation of the plurality of pulsation reduction members is prevented by fitting the key portion into the key groove. 前記キー部は、前記脈動低減部材の外周面に形成された凹部にキー部材を係合させることで構成される請求項５に記載の脈動低減機構。   The pulsation reduction mechanism according to claim 5, wherein the key portion is configured by engaging a key member with a recess formed in an outer peripheral surface of the pulsation reduction member. 前記凹部は、周方向に複数形成されている請求項６に記載の脈動低減機構。   The pulsation reduction mechanism according to claim 6, wherein a plurality of the recesses are formed in the circumferential direction. 前記凹部は、前記脈動低減部材の外周面のうち前記軸方向の全域にわたって形成されている請求項６または７に記載の脈動低減機構。   The pulsation reduction mechanism according to claim 6 or 7, wherein the recess is formed over the entire area in the axial direction on the outer peripheral surface of the pulsation reduction member. 前記複数の脈動低減部材のうち一の脈動低減部材に他の脈動低減部材が隣接しているとき、
前記回転防止手段は、
前記一の脈動低減部材のうち前記他の脈動低減部材に対向する面に形成された第１係合部と、
前記他の脈動低減部材のうち前記一の脈動低減部材に対向する面に形成され、前記第１係合部と係合可能な第２係合部と、
を有し、
前記第１係合部と前記第２係合部とが係合することで、前記複数の脈動低減部材の相対回転が防止される請求項１に記載の脈動低減機構。 When another pulsation reducing member is adjacent to one pulsation reducing member among the plurality of pulsation reducing members,
The rotation preventing means is
A first engaging portion formed on a surface of the one pulsation reducing member facing the other pulsation reducing member;
A second engagement portion formed on a surface facing the one pulsation reduction member among the other pulsation reduction members, and engageable with the first engagement portion;
Have
The pulsation reduction mechanism according to claim 1, wherein relative rotation of the plurality of pulsation reduction members is prevented by engagement of the first engagement portion and the second engagement portion. 前記第１係合部が周方向に複数形成されるとともに、前記第２係合部が前記第１係合部と対応して周方向に複数形成されている請求項９に記載の脈動低減機構。   The pulsation reducing mechanism according to claim 9, wherein a plurality of the first engagement portions are formed in the circumferential direction, and a plurality of the second engagement portions are formed in the circumferential direction corresponding to the first engagement portions. . 前記第１係合部が周方向に等間隔で複数形成されるとともに、前記第２係合部が周方向に前記第１係合部と同じ間隔で同数形成されている請求項１０に記載の脈動低減機構。   11. The plurality of first engagement portions are formed at equal intervals in the circumferential direction, and the same number of the second engagement portions are formed at the same interval as the first engagement portions in the circumferential direction. Pulsation reduction mechanism.

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