JP2020159441A

JP2020159441A - Three-way valve

Info

Publication number: JP2020159441A
Application number: JP2019058542A
Authority: JP
Inventors: 梅村　鎮基; Chinki Umemura; 鎮基梅村; 和輝松枝; Kazuteru Matsueda
Original assignee: RINNAI SEIKI KK; Rinnai Corp
Current assignee: RINNAI SEIKI KK; Rinnai Corp
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-10-01
Anticipated expiration: 2039-03-26
Also published as: JP7148449B2

Abstract

To provide a three-way valve that can suppress increase in passage resistance in a valve body due to reduction in diameter of the valve body, and can prevent seal failure of each radial port due to deflection of a peripheral wall part of the valve body facing each radial port.SOLUTION: A valve body 2 is provided with a reinforcing rib 25 extending in an axial direction along a diameter direction of the valve body passing through a circumferential middle part of a valve opening 22. Also, the portion of the peripheral wall part of the valve body adjacent to one end side in the axial direction of the valve opening 22 is cut out except for a peripheral wall portion 21a in a predetermined circumferential range narrower than the circumferential range of the valve opening 22 and centered on the reinforcing rib 25.SELECTED DRAWING: Figure 5

Description

本発明は、円筒状の周面を持つ弁室と、弁室の軸方向一端に連通する軸方向ポートと、弁室の周面の周方向２箇所に開口する第１と第２の一対の径方向ポートとを有する弁筐と、弁室内に回転自在に設けられた円筒状の周壁部を持つ弁体とを備え、弁体の軸方向一端は、弁体の内部空間と軸方向ポートとを常時連通するように開放され、弁体の周壁部に、弁体の回転で弁体の内部空間と第１と第２の各径方向ポートとを連通可能な単一の弁開口が形成された三方弁に関する。 In the present invention, a valve chamber having a cylindrical peripheral surface, an axial port communicating with one end in the axial direction of the valve chamber, and a pair of first and second openings opened at two locations in the circumferential direction of the peripheral surface of the valve chamber. A valve housing having a radial port and a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber are provided, and one axial end of the valve body is an internal space of the valve body and an axial port. A single valve opening is formed on the peripheral wall of the valve body so that the internal space of the valve body and the first and second radial ports can be communicated with each other by the rotation of the valve body. Regarding the three-way valve.

この種の三方弁においては、弁開口が存在しない周方向部分の周壁部が第１と第２の各径方向ポートに対向してこれら各径方向ポートを閉鎖したときに、各径方向ポートに対向する周壁部の部分が各径方向ポートの流体圧に押されて径方向内方に撓み、各径方向ポートのシール不良を生ずる可能性がある。 In this type of three-way valve, when the peripheral wall portion of the circumferential portion where the valve opening does not exist faces the first and second radial ports and closes each of these radial ports, it becomes each radial port. The portions of the facing peripheral walls may be pushed by the fluid pressure of each radial port and flex inward in the radial direction, resulting in poor sealing of each radial port.

そこで、従来、弁体に、弁開口の周方向中間部を通る弁体の直径方向に沿って軸方向に延在する補強リブを設けたものが知られている（例えば、特許文献１参照）。これによれば、各径方向ポートに対向する周壁部の部分の撓みを補強リブにより阻止し、各径方向ポートのシール不良を防止することができる。 Therefore, conventionally, it is known that the valve body is provided with reinforcing ribs extending in the axial direction along the diameter direction of the valve body passing through the circumferential intermediate portion of the valve opening (see, for example, Patent Document 1). .. According to this, the bending of the peripheral wall portion facing each radial port can be prevented by the reinforcing rib, and the sealing failure of each radial port can be prevented.

ところで、最近は、三方弁の小型化のため、弁体を小径化することが望まれている。然し、弁体を小径化すると、弁体での通路抵抗が大きくなってしまう。従って、弁体の小径化のためには、弁体での通路抵抗の増加を抑制することが必要になる。 By the way, recently, in order to reduce the size of the three-way valve, it is desired to reduce the diameter of the valve body. However, if the diameter of the valve body is reduced, the passage resistance in the valve body increases. Therefore, in order to reduce the diameter of the valve body, it is necessary to suppress an increase in passage resistance in the valve body.

特開２０１０−１９２５号公報Japanese Unexamined Patent Publication No. 2010-1925

本発明は、以上の点に鑑み、弁体の小径化による弁体での通路抵抗の増加を抑制することができるようにした三方弁を提供することをその課題としている。 In view of the above points, it is an object of the present invention to provide a three-way valve capable of suppressing an increase in passage resistance in the valve body due to a small diameter of the valve body.

上記課題を解決するために、本発明は、円筒状の周面を持つ弁室と、弁室の軸方向一端に連通する軸方向ポートと、弁室の周面の周方向２箇所に開口する第１と第２の一対の径方向ポートとを有する弁筐と、弁室内に回転自在に設けられた円筒状の周壁部を持つ弁体とを備え、弁体の軸方向一端は、弁体の内部空間と軸方向ポートとを常時連通するように開放され、弁体の周壁部に、弁体の回転で弁体の内部空間と第１と第２の各径方向ポートとを連通可能な単一の弁開口が形成された三方弁において、弁体に、弁開口の周方向中間部を通る弁体の直径方向に沿って軸方向に延在する補強リブが設けられると共に、弁開口の軸方向一端側に隣接する弁体の周壁部の部分が、弁開口の周方向範囲よりも狭い、補強リブを中心とした所定の周方向範囲の周壁部分を除いて切り欠かれていることを特徴とする。 In order to solve the above problems, the present invention opens a valve chamber having a cylindrical peripheral surface, an axial port communicating with one end in the axial direction of the valve chamber, and two openings in the circumferential direction of the peripheral surface of the valve chamber. A valve housing having a pair of first and second radial ports and a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber are provided, and one end in the axial direction of the valve body is a valve body. The internal space of the valve body and the axial port are opened so as to always communicate with each other, and the internal space of the valve body and the first and second radial ports can be communicated with the peripheral wall portion of the valve body by rotating the valve body. In a three-way valve in which a single valve opening is formed, the valve body is provided with reinforcing ribs extending axially along the radial direction of the valve body passing through the circumferential middle portion of the valve opening, and the valve opening The portion of the peripheral wall of the valve body adjacent to one end side in the axial direction is cut out except for the peripheral wall portion of the predetermined circumferential range centered on the reinforcing rib, which is narrower than the circumferential range of the valve opening. It is a feature.

本発明によれば、弁体の弁開口の軸方向一端側（即ち、軸方向ポート側）に隣接する周壁部を切り欠いた部分において、周壁部の厚み分だけ軸方向ポートとの間の通路面積が大きくなる。そのため、弁体の小径化による弁体での通路抵抗の増加を抑制することができる。尚、弁開口が存在しない周方向部分の周壁部が第１と第２の各径方向ポートに対向したときに、この周壁部の部分に作用する各径方向ポートの流体圧は、補強リブを介して当該補強リブを中心とした所定の周方向範囲に残された周壁部分で受けることができる。そのため、弁体の弁開口の軸方向一端側に隣接する周壁部を上記周方向範囲を除いて切り欠いても、各径方向ポートに対向する周壁部の部分の撓みを生ずることはなく、各径方向ポートのシール不良を防止できる。 According to the present invention, in a portion of the valve body in which the peripheral wall portion adjacent to one end side in the axial direction (that is, the axial port side) is cut out, a passage between the valve body and the axial port portion by the thickness of the peripheral wall portion. The area becomes large. Therefore, it is possible to suppress an increase in passage resistance in the valve body due to the reduction in the diameter of the valve body. When the peripheral wall portion of the circumferential portion where the valve opening does not exist faces the first and second radial ports, the fluid pressure of each radial port acting on the peripheral wall portion is a reinforcing rib. It can be received at the peripheral wall portion left in a predetermined circumferential range centered on the reinforcing rib. Therefore, even if the peripheral wall portion adjacent to one end side in the axial direction of the valve opening of the valve body is cut out except for the above-mentioned circumferential direction range, the peripheral wall portion facing each radial port does not bend, and each It is possible to prevent defective sealing of the radial port.

本発明の実施形態の三方弁の切断側面図。The cut side view of the three-way valve of embodiment of this invention. 図１のＩＩ−ＩＩで切断した切断平面図。The cut plan view cut by II-II of FIG. 実施形態の三方弁に設けられるパッキン及びパッキン装着部材の斜視図。The perspective view of the packing and the packing mounting member provided in the three-way valve of the embodiment. 実施形態の三方弁に設けられる弁筐の上半部を切除した状態の斜視図。The perspective view of the state in which the upper half part of the valve casing provided in the three-way valve of an embodiment is cut off. 実施形態の三方弁に設けられる弁体の斜視図。The perspective view of the valve body provided in the three-way valve of an embodiment.

図１、図２に示す本発明の実施形態の三方弁は、円筒状の周面を持つ弁室１１と、弁室１１の軸方向一端（図１の下端）に連通する軸方向ポート１２と、弁室１１の周面の周方向２箇所に開口する第１と第２の一対の径方向ポート１３_１，１３_２とを有する弁筐１を備えている。尚、この三方弁は、第１径方向ポート１３_１から軸方向ポート１２に流す第１の流体と第２径方向ポート１３_２から軸方向ポート１２に流す第２の流体との混合割合を切換える混合弁、或いは、軸方向ポート１２に流入する流体の第１径方向ポート１３_１と第２径方向ポート１３_２とへの分配割合を切換える分配弁として用いるものである。 The three-way valve of the embodiment of the present invention shown in FIGS. 1 and 2 has a valve chamber 11 having a cylindrical peripheral surface and an axial port 12 communicating with one axial end (lower end of FIG. 1) of the valve chamber 11. , and a valve housing 1 having a first and a ₂ second pair of radial ports 13 _1, 13 which is open in the circumferential direction two portions of the circumferential surface of the valve chamber 11. Incidentally, the three-way valve switches the mixing ratio of the first fluid and the second fluid flow from the second radial port 13 ₂ axially port 12 to flow from the first radial port 13 ₁ in the axial direction port 12 mixing valve, or is to use as a distribution valve for switching the distribution ratio of the first radial port 13 ₁ of the fluid flowing axially port 12 and the second radial port 13 _2.

三方弁は、更に、弁室１１内に回転自在に設けられた円筒状の周壁部２１を持つ弁体２を備えている。弁体２の軸方向一端は、弁体２の内部空間と軸方向ポート１２とを常時連通するように開放されている。また、弁体２の周壁部２１には、弁体２の回転で弁体２の内部空間と第１と第２の各径方向ポート１３_１，１３_２とを連通可能な単一の弁開口２２が形成されている。弁体２の軸方向他端の端壁には、弁軸２３が立設されている。そして、弁軸２３を弁筐１の外面に搭載したモータ３に連結して、モータ３により弁体２を回転させるようにしている。 The three-way valve further includes a valve body 2 having a cylindrical peripheral wall portion 21 rotatably provided in the valve chamber 11. One end of the valve body 2 in the axial direction is open so as to always communicate with the internal space of the valve body 2 and the axial port 12. Further, the peripheral wall 21 of the valve body 2, the interior space and first and second respective radial ports 13 _1, 13 ₂ and communicable a single valve opening in the valve body 2 by the rotation of the valve body 2 22 is formed. A valve shaft 23 is erected on the end wall of the other end of the valve body 2 in the axial direction. Then, the valve shaft 23 is connected to the motor 3 mounted on the outer surface of the valve housing 1, and the valve body 2 is rotated by the motor 3.

また、図５に示す如く、弁体２の軸方向他端の端壁の外周部の１箇所には、弁室１１の軸方向他端面に形成した円弧状溝１４に挿入されるストッパ突起２４が突設されている。そして、円弧状溝１４の両端にストッパ突起２４が当接することで、弁体２の回転範囲が制限されるようにしている。 Further, as shown in FIG. 5, a stopper protrusion 24 is inserted into an arcuate groove 14 formed on the other end surface of the valve chamber 11 in the axial direction at one location on the outer peripheral portion of the end wall at the other end in the axial direction of the valve body 2. Is projected. The rotation range of the valve body 2 is limited by the stopper protrusions 24 contacting both ends of the arcuate groove 14.

第１と第２の各径方向ポート１３_１，１３_２の弁室１１に対する開口端の周囲には、環状のパッキン装着溝４が設けられている。そして、各パッキン装着溝４に、弁体２の周壁部２１の外周面に接する環状の各パッキン５が装着されている。尚、各パッキン装着溝４及び各パッキン５は、弁室１１側から見た形状がほぼ方形の環状になっている。 Around the open end with respect to the first and second respective radial ports 13 _1, 13 ₂ of the valve chamber 11, an annular packing mounting groove 4 is provided. An annular packing 5 in contact with the outer peripheral surface of the peripheral wall portion 21 of the valve body 2 is mounted in each packing mounting groove 4. Each packing mounting groove 4 and each packing 5 has an annular shape as seen from the valve chamber 11 side.

また、本実施形態において、各パッキン装着溝４の外周側溝壁４１は、弁筐１に一体に形成されている。一方、各径方向ポート１３_１，１３_２の弁室１１に対する開口端を囲う各パッキン装着溝４の内周側溝壁４２と、各パッキン５の弁室１１側と反対の基端部５１を受ける各パッキン装着溝４の底壁４３とは、弁筐１とは別体で、各径方向ポート１３_１，１３_２において弁筐１に嵌合固定される環状の各パッキン装着部材６に形成されている。 Further, in the present embodiment, the outer peripheral side groove wall 41 of each packing mounting groove 4 is integrally formed with the valve housing 1. On the other hand, receives an inner circumferential side groove wall 42 of the packing mounting groove 4 surrounding the open end, the valve chamber 11 side opposite to the base end portion 51 of the gasket 5 with respect to each radial port 13 _1, 13 ₂ of the valve chamber 11 the bottom wall 43 of each packing mounting groove 4, the valve housing 1 separately, are formed in each packing mounting member 6 of an annular that is fitted and fixed to the valve housing 1 in each radial port 13 _1, 13 ₂ ing.

図３を参照して、各パッキン装着部材６の上記底壁４３となる部分から外方にのびる筒部６１の周方向４箇所には、筒部６１の径方向に弾性変形可能な爪部６２が設けられている。また、図４に示す如く、各径方向ポート１３_１，１３_２の周面には、各爪部６２に対応する凹溝１３１が形成されている。そして、各パッキン装着部材６に形成した内周側溝壁４２に各パッキン５を外嵌させた状態で、各パッキン装着部材６を各径方向ポート１３_１，１３_２に外方から挿入したときに、各パッキン装着部材６が所定のセット位置に到達したところで、各爪部６２が凹溝１３１に弾性的に入り込んで係合し、各パッキン装着部材６が各径方向ポート１３_１，１３_２において弁筐１に嵌合固定されるようにしている。 With reference to FIG. 3, at four locations in the circumferential direction of the tubular portion 61 extending outward from the portion of each packing mounting member 6 serving as the bottom wall 43, claw portions 62 elastically deformable in the radial direction of the tubular portion 61 Is provided. Further, as shown in FIG. 4, the peripheral surface of each radial port ₁₃ 1, 13 _2, grooves 131 corresponding to the respective claw portions 62 are formed. Then, in a state in which each gasket 5 in the circumferential groove wall 42 within which is formed in each packing mounting member 6 was fitted to, when inserted from the outside of each packing mounting member 6 on each radial port 13 _1, 13 ₂ , where each packing mounting member 6 has reached a predetermined set position, the pawl portions 62 are engaged enters elastically in the groove 131, in each packing mounting members 6 each radial port 13 _1, 13 ₂ It is fitted and fixed to the valve housing 1.

尚、各パッキン５の基端部５１は、外周側に屈曲するフランジ状に形成されている。また、各径方向ポート１３_１，１３_２の周面に、各パッキン装着溝４の外周側溝壁４１となる部分の基端に位置させて、外方を向く段差１３２を形成している。そして、各パッキン装着部材６が上記セット位置に到達したとき、各パッキン５のフランジ状基端部５１が段差１３２と底壁４３との間に挟まれるようにしている。 The base end portion 51 of each packing 5 is formed in a flange shape that bends toward the outer peripheral side. Further, on the outer periphery of the radial ports 13 _1, 13 _2, by positioning the proximal end of the portion to be the outer periphery side groove wall 41 of the packing mounting groove 4, to form a step 132 that faces outward. When each packing mounting member 6 reaches the set position, the flange-shaped base end portion 51 of each packing 5 is sandwiched between the step 132 and the bottom wall 43.

また、各パッキン装着部材６の筒部６１の先端部外面の対角位置には、突条６３が突設されている。一方、各径方向ポート１３_１，１３_２の周面の対角位置には、突条６３が係合可能な各径方向ポート１３_１，１３_２の長手方向にのびる溝部１３３が形成されている。そして、溝部１３３への突条６３の係合で各パッキン装着部材６が位相決めされるようにしている。 Further, a ridge 63 is provided at a diagonal position on the outer surface of the tip end portion of the tubular portion 61 of each packing mounting member 6. On the other hand, the diagonal positions of the peripheral surface of the radial port ₁₃ 1, 13 _2, a groove portion 133 projecting 63 extending in the longitudinal direction of the engageable radial ports ₁₃ 1, 13 ₂ are formed .. Then, each packing mounting member 6 is phase-determined by engaging the protrusion 63 with the groove portion 133.

ところで、弁体２の弁開口２２が存在しない周方向部分の周壁部２１が第１と第２の各径方向ポート１３_１，１３_２に対向して各径方向ポート１３_１，１３_２を閉鎖したときに、各径方向ポート１３_１，１３_２に対向する周壁部２１の部分が各径方向ポート１３_１，１３_２の流体圧に押されて径方向内方に撓み、各径方向ポート１３_１，１３_２のシール不良を生ずる可能性がある。また、弁小型化のため、弁体２の径を小さくすると、弁体２での通路抵抗が大きくなる。 Incidentally, the peripheral wall portion 21 first and second respective radial directions ports ₁₃ 1, 13 ₂ opposed to each radial port ₁₃ 1 of the circumferential portion of the valve opening 22 of the valve element 2 does not exist, 13 ₂ a closed when, each radial port 13 _1, 13 ₂ opposing portions of the peripheral wall portion 21 is pushed to the fluid pressure of each radial port 13 _1, 13 ₂ flexes radially inward, each radial port 13 _1, 13 is likely to produce a _second seal failure. Further, if the diameter of the valve body 2 is reduced in order to reduce the size of the valve, the passage resistance in the valve body 2 increases.

そこで、本実施形態では、図５に明示する如く、弁体２に、弁開口２２の周方向中間部を通る弁体２の直径方向に沿って軸方向に延在する補強リブ２５を設けている。更に、弁開口２２の軸方向一端側（図１、図５の下端側、即ち、軸方向ポート１２側）に隣接する弁体２の周壁部２１の部分を、弁開口２２の周方向範囲よりも狭い、補強リブ２５を中心とした所定の周方向範囲の周壁部分２１ａを除いて切り欠いている。周壁部２１を切り欠いた部分は、図５に２点鎖線で示されている。 Therefore, in the present embodiment, as clearly shown in FIG. 5, the valve body 2 is provided with a reinforcing rib 25 extending in the axial direction along the diameter direction of the valve body 2 passing through the circumferential intermediate portion of the valve opening 22. There is. Further, the portion of the peripheral wall portion 21 of the valve body 2 adjacent to the one end side in the axial direction of the valve opening 22 (the lower end side in FIGS. 1 and 5, that is, the axial port 12 side) is set from the circumferential range of the valve opening 22. It is notched except for the peripheral wall portion 21a in a predetermined circumferential range centered on the reinforcing rib 25, which is also narrow. The notched portion of the peripheral wall portion 21 is shown by a two-dot chain line in FIG.

ここで、弁開口２２の軸方向一端側に隣接する周壁部２１を切り欠いた部分では、周壁部２１の厚み分だけ軸方向ポート１２との間の通路面積が大きくなる。そのため、弁体２の小径化による弁体２での通路抵抗の増加を抑制することができる。また、弁開口２２が存在しない周方向部分の周壁部２１が第１と第２の各径方向ポート１３_１，１３_２に対向したときに、この周壁部２１の部分に作用する各径方向ポート１３_１，１３_２の流体圧は、補強リブ２５を介して当該補強リブ２５を中心とした所定の周方向範囲に存する上記周壁部分２１ａで受けることができる。そのため、弁開口２２の軸方向一端側に隣接する弁体２の周壁部２１の部分を上記周壁部分２１ａを除いて切り欠いても、各径方向ポート１３_１，１３_２に対向する周壁部２１の部分の撓みを生ずることはなく、各径方向ポート１３_１，１３_２のシール不良を防止できる。 Here, in the portion where the peripheral wall portion 21 adjacent to one end side in the axial direction of the valve opening 22 is cut out, the passage area between the valve opening 22 and the axial port 12 is increased by the thickness of the peripheral wall portion 21. Therefore, it is possible to suppress an increase in passage resistance in the valve body 2 due to the reduction in the diameter of the valve body 2. Further, when the peripheral wall portion 21 of the circumferential portions having no valve opening 22 is opposed to the first and the diameter of the second direction port 13 _1, 13 _2, each radial port acting on the portion of the peripheral wall 21 13 _1, 13 ₂ of the fluid pressure can be received by the peripheral wall portion 21a existing in a predetermined circumferential direction range centered the reinforcing ribs 25 via the reinforcing ribs 25. Therefore, the peripheral wall portion 21 which faces the axial end also part of the peripheral wall portion 21 of the valve body 2 adjacent to the side notching except the peripheral wall portion 21a, the radial ports 13 _1, 13 ₂ of the valve opening 22 it caused the deflection of the portion not, each radial port 13 _1, 13 ₂ of the sealing failure can be prevented.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、上記実施形態の三方弁は、モータ３により弁体２を回転させる電動式であるが、手動式のものであってもよい。 Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, the three-way valve of the above embodiment is an electric type in which the valve body 2 is rotated by a motor 3, but may be a manual type.

１…弁筐、１１…弁室、１２…軸方向ポート、１３_１…第１径方向ポート、１３_２…第２径方向ポート、２…弁体、２１…周壁部、２１ａ…補強リブを中心とした所定の周方向範囲の周壁部分、２２…弁開口、２５…補強リブ。 1 ... valve housing, 11 ... valve chamber, 12 ... axial port, 13 ₁ ... first radial port, 13 ₂ ... second radial port, 2 ... valve body, 21 ... peripheral wall, 21a ... centered on reinforcing ribs Peripheral wall portion in a predetermined circumferential range, 22 ... valve opening, 25 ... reinforcing rib.

Claims

A valve chamber having a cylindrical peripheral surface, an axial port communicating with one end in the axial direction of the valve chamber, and a pair of first and second radial ports that open at two locations in the circumferential direction of the peripheral surface of the valve chamber. A valve housing having a valve housing and a valve body having a cylindrical peripheral wall portion rotatably provided in the valve chamber are provided, and one axial end of the valve body always communicates with the internal space of the valve body and the axial port. In a three-way valve, a single valve opening is formed on the peripheral wall of the valve body so that the internal space of the valve body and the first and second radial ports can be communicated by the rotation of the valve body. ,
The valve body is provided with reinforcing ribs extending in the axial direction along the radial direction of the valve body passing through the circumferential middle portion of the valve opening.
The peripheral wall portion of the valve body adjacent to one end side in the axial direction of the valve opening is cut out except for the peripheral wall portion in a predetermined circumferential direction centered on the reinforcing rib, which is narrower than the circumferential range of the valve opening. A three-way valve characterized by being present.