WO2020170720A1 - Flow control valve and assembly method for same - Google Patents
Flow control valve and assembly method for same Download PDFInfo
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- WO2020170720A1 WO2020170720A1 PCT/JP2020/002714 JP2020002714W WO2020170720A1 WO 2020170720 A1 WO2020170720 A1 WO 2020170720A1 JP 2020002714 W JP2020002714 W JP 2020002714W WO 2020170720 A1 WO2020170720 A1 WO 2020170720A1
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- valve
- press
- base member
- control valve
- flow control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
Definitions
- a method of assembling a flow rate control valve wherein one end of the outer cylinder member is closed with the base member, and the support is provided in a circular hole arranged coaxially with the valve port provided in the base member.
- the cylindrical portion arranged coaxially with the drive shaft provided in the member is press-fitted, and the press-fitting of the cylindrical portion is advanced until the other end of the outer tubular member hits the support member, and the other end of the outer tubular member is pushed.
- a back pressure chamber that is partitioned from the valve chamber is formed on the outside of the base member by closing the support member, and the valve body or the drive shaft is arranged across the valve chamber and the back pressure chamber. It is characterized by doing.
- the fitting portion 71e of the holder body 71B is fitted inside the upper end 20b of the outer tubular member 20. Since the outer diameter of the fitting portion 71e is the same as the inner diameter of the outer tubular member 20, the outer peripheral surface of the fitting portion 71e is formed so as to contact the inner circumferential surface of the outer tubular member 20. With this, when the cylindrical portion 72B is press-fitted into the circular hole 14 of the base member 10, the outer peripheral surface of the fitting portion 71e contacts the inner peripheral surface of the outer tubular member 20 to move in the vertical direction (press-fitting direction). invite. Therefore, it is possible to prevent the cylindrical portion 72B from being inclined and press-fitted into the circular hole 14.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Valve Housings (AREA)
- Lift Valve (AREA)
Abstract
[Problem] To provide: a flow control valve that makes it possible to effectively decrease the differential pressure applied to a valve element in a movement direction without constraints on the shape of the valve element; and an assembly method for the flow control valve. [Solution] A flow control valve 1 in which a lower end 20a of an outer cylinder member 20 is plugged by a base member 10 and an upper end 20b of the outer cylinder member 20 is plugged by a holder body 71 to form a back pressure chamber 23 that is separated from a valve chamber 13. A drive shaft 64 is arranged to span the valve chamber 13 and the back pressure chamber 23. A passage 16 that goes to a valve opening 15 and a pressure equalization hole 17 that connects said passage 16 and the back pressure chamber 23 are provided in the base member 10.
Description
本発明は、例えば、冷凍サイクル等に組み込まれて冷媒等の流体の流量制御に用いられる流量制御弁およびその組立方法に関する。
The present invention relates to, for example, a flow rate control valve that is incorporated in a refrigeration cycle or the like and used for flow rate control of a fluid such as a refrigerant, and an assembly method thereof.
特許文献１に従来の圧力バランス型の流量制御弁が開示されている。特許文献１の流量制御弁は、弁ハウジング内に設けられた円筒形状のガイド部と、このガイド部内に摺動可能に設けられた弁体とを有している。弁体は、アクチュエータによってガイド部の軸方向（すなわち移動方向）に移動されることにより弁口を開閉する。また、弁体は、弁口と背圧室とを接続する均圧路が設けられており、弁口の流体圧力と背圧室の流体圧力との圧力バランスをとるようにしている。これにより、弁体に対して弁口側から加わる流体圧力と背圧室側から加わる流体圧力との差（差圧力）が小さくなるようにしている。
Patent Document 1 discloses a conventional pressure balance type flow control valve. The flow control valve of Patent Document 1 has a cylindrical guide portion provided in the valve housing, and a valve body slidably provided in the guide portion. The valve body opens and closes the valve port by being moved in the axial direction (that is, the moving direction) of the guide portion by the actuator. Further, the valve body is provided with a pressure equalizing passage that connects the valve port and the back pressure chamber, so that the fluid pressure of the valve port and the fluid pressure of the back pressure chamber are balanced. As a result, the difference (differential pressure) between the fluid pressure applied to the valve body from the valve opening side and the fluid pressure applied from the back pressure chamber side is reduced.
しかしながら、特許文献１の流量制御弁では、弁体を貫通する縦孔を均圧路として設けているので、弁体の先端を尖った形状とすることができない。そのため、弁体の形状が制約される。これにより、例えば、イコールパーセントとなる流量特性を実現することが困難となり、流量特性も制約されてしまう。
However, in the flow control valve of Patent Document 1, since the vertical hole penetrating the valve body is provided as a pressure equalizing passage, the tip of the valve body cannot be formed into a sharp shape. Therefore, the shape of the valve body is restricted. As a result, for example, it becomes difficult to realize a flow rate characteristic of equal percent, and the flow rate characteristic is also limited.
そこで、本発明は、弁体の形状が制約されることなく弁体に対して移動方向に加わる差圧力を効果的に小さくできる流量制御弁およびその組立方法を提供することを目的とする。
Therefore, an object of the present invention is to provide a flow rate control valve that can effectively reduce the differential pressure applied to the valve body in the moving direction without restricting the shape of the valve body, and an assembling method thereof.
上記目的を達成するために、本発明の一態様に係る流量制御弁は、弁室および前記弁室に開口する弁口が設けられた基体部材と、前記基体部材の外側に配置された外筒部材と、前記弁口に対向して配置され、前記弁口を開閉する弁体と、前記弁体が先端部に設けられた駆動軸と、前記駆動軸を前記弁口と前記弁体との対向方向に移動可能に支持する支持部材と、を有し、前記外筒部材の一端が前記基体部材により塞がれ、かつ、前記外筒部材の他端が前記支持部材により塞がれており、前記弁室と区画された背圧室が形成され、前記弁体または前記駆動軸が前記弁室と前記背圧室とをまたいで配置され、前記基体部材は、前記弁口に連なる流路および当該流路と前記背圧室とを接続する均圧孔が設けられていることを特徴とする。
In order to achieve the above object, a flow rate control valve according to an aspect of the present invention includes a base member provided with a valve chamber and a valve opening that opens to the valve chamber, and an outer cylinder arranged outside the base member. A member, a valve body that is arranged so as to face the valve opening and that opens and closes the valve opening, a drive shaft that has the valve body provided at its tip, and a drive shaft that includes the valve opening and the valve body. A support member movably supported in the opposite direction, one end of the outer cylinder member is closed by the base member, and the other end of the outer cylinder member is closed by the support member. A back pressure chamber that is partitioned from the valve chamber is formed, the valve body or the drive shaft is arranged so as to straddle the valve chamber and the back pressure chamber, and the base member is a flow path that connects to the valve port. And a pressure equalizing hole that connects the flow path and the back pressure chamber.
本発明によれば、外筒部材の一端が基体部材により塞がれ、かつ、外筒部材の他端が支持部材により塞がれており、弁室と区画された背圧室が形成されている。弁体または駆動軸が弁室と背圧室とをまたいで配置されている。そして、基体部材は、弁口に連なる流路および当該流路と背圧室とを接続する均圧孔が設けられている。このようにしたことから、基体部材に設けられた均圧孔によって、弁体によって弁口が閉じられた閉弁状態において、弁体に対して弁口側から加わる流体圧力と背圧室側から加わる流体圧力との差を小さくすることができる。そのため、弁体の形状が制約されることなく弁体に対して移動方向に加わる差圧力を効果的に小さくできる。
According to the present invention, one end of the outer cylinder member is closed by the base member, and the other end of the outer cylinder member is closed by the support member, thereby forming a back pressure chamber partitioned from the valve chamber. There is. The valve body or the drive shaft is arranged so as to straddle the valve chamber and the back pressure chamber. Further, the base member is provided with a flow path that communicates with the valve port and a pressure equalizing hole that connects the flow path and the back pressure chamber. From this, in the valve closed state in which the valve opening is closed by the valve body by the pressure equalizing hole provided in the base member, the fluid pressure applied from the valve opening side to the valve body and the back pressure chamber side The difference from the applied fluid pressure can be reduced. Therefore, the differential pressure applied to the valve body in the moving direction can be effectively reduced without restricting the shape of the valve body.
本発明において、前記流量制御弁は、前記弁体または前記駆動軸が貫通する環状に形成され、前記弁室と前記背圧室との間を封止する封止部材を有し、前記封止部材が封止する封止箇所の径が、前記弁口の径と同一であることが好ましい。このようにすることで、閉弁状態において、弁体に対して弁口側から加わる流体圧力と背圧室側から加わる流体圧力との差を零（ほぼ零含む）にすることができる。そのため、弁体の形状が制約されることなく弁体に対して移動方向に加わる差圧力をより効果的に小さくできる。
In the present invention, the flow rate control valve includes a sealing member that is formed in an annular shape through which the valve body or the drive shaft penetrates and that seals between the valve chamber and the back pressure chamber, It is preferable that the diameter of the sealing portion sealed by the member is the same as the diameter of the valve port. By doing so, in the valve closed state, the difference between the fluid pressure applied to the valve body from the valve opening side and the fluid pressure applied to the back pressure chamber side can be made zero (including almost zero). Therefore, the differential pressure applied to the valve body in the moving direction can be reduced more effectively without restricting the shape of the valve body.
本発明において、前記流量制御弁は、前記基体部材および前記支持部材のうちの一方に突部が設けられ、かつ、他方に前記突部が挿入されて当該突部の前記対向方向と直交する方向への移動を規制する孔が設けられていることが好ましい。例えば、基体部材と支持部材とを外筒部材を介して組み付ける場合、基体部材と外筒部材、および、支持部材と外筒部材のそれぞれの寸法公差および組付精度の影響を受けてしまい、弁口と弁体との軸ずれが生じるおそれがある。これに対して、基体部材および支持部材のうちの一方に位置決め用の突部を設け、他方に位置決め用の孔を設けて、基体部材と支持部材とを直接組み付けることで、弁口と弁体との軸ずれを効果的に抑制できる。
In the present invention, in the flow rate control valve, a protrusion is provided on one of the base member and the support member, and the protrusion is inserted on the other side so that a direction orthogonal to the facing direction of the protrusion is provided. It is preferable that a hole that restricts the movement of the sheet is provided. For example, when the base member and the support member are assembled through the outer tubular member, the dimensional tolerance and the assembly accuracy of the base member and the outer tubular member, and the support member and the outer tubular member are affected, and the valve There is a risk of misalignment between the mouth and the valve body. On the other hand, one of the base member and the support member is provided with a positioning projection, and the other is provided with a positioning hole, so that the base member and the support member are directly assembled to each other. The axis deviation with
本発明において、前記基体部材に、前記孔としての前記弁口と同軸に配置された円形孔が設けられ、前記支持部材に、前記突部としての前記駆動軸と同軸に配置された円筒部が設けられていることが好ましい。このようにすることで、比較的簡易な構成で弁口と弁体との軸ずれを効果的に抑制することができる。
In the present invention, the base member is provided with a circular hole arranged coaxially with the valve opening as the hole, and the support member is provided with a cylindrical portion arranged coaxially with the drive shaft as the protrusion. It is preferably provided. By doing so, it is possible to effectively suppress axial misalignment between the valve opening and the valve body with a relatively simple configuration.
本発明において、前記円筒部が前記円形孔に圧入されていることが好ましい。このようにすることで、基体部材と支持部材とをより確実に組み付けることができる。
In the present invention, it is preferable that the cylindrical portion is press-fitted into the circular hole. By doing so, the base member and the support member can be assembled more reliably.
本発明において、前記円筒部が、前記円形孔に圧入される圧入端部と、前記圧入端部に連なり、当該圧入端部より大径の本体部と、を有し、前記圧入端部と前記本体部との間の段部が、前記基体部材に当接されていることが好ましい。このようにすることで、円筒部の圧入端部と本体部との間の段部が基体部材に当接するまで圧入端部を円形孔に圧入することができる。そのため、複数の流量制御弁を組み立てた際に、支持部材の円筒部における基体部材の円形孔への圧入量（圧入される部分の寸法）を均一にすることができる。
In the present invention, the cylindrical portion has a press-fitting end portion that is press-fitted into the circular hole, and a main body portion that is continuous with the press-fitting end portion and has a larger diameter than the press-fitting end portion. It is preferable that a step portion between the main body portion and the main body portion is in contact with the base member. By doing so, the press-fitting end portion can be press-fitted into the circular hole until the step portion between the press-fitting end portion of the cylindrical portion and the main body portion contacts the base member. Therefore, when a plurality of flow rate control valves are assembled, the amount of press-fitting (the size of the press-fitted part) into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
本発明において、前記円筒部が、前記円形孔に圧入される圧入端部と、前記圧入端部に連なる本体部と、を有し、前記本体部における前記圧入端部側の端部に、前記圧入端部より径方向外方に突出する突出部が設けられ、前記突出部が、前記基体部材に当接されていることが好ましい。このようにすることで、円筒部の突出部が基体部材に当接するまで圧入端部を円形孔に圧入することができる。そのため、複数の流量制御弁を組み立てた際に、支持部材の円筒部における基体部材の円形孔への圧入量を均一にすることができる。
In the present invention, the cylindrical portion has a press-fitting end portion that is press-fitted into the circular hole, and a main body portion that is continuous with the press-fitting end portion, and at the end portion of the main body portion on the press-fitting end portion side, the It is preferable that a projecting portion is provided that projects radially outward from the press-fitting end portion, and the projecting portion is in contact with the base member. By doing so, the press-fitting end portion can be press-fitted into the circular hole until the protruding portion of the cylindrical portion comes into contact with the base member. Therefore, when a plurality of flow control valves are assembled, the amount of press-fitting into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
本発明において、前記支持部材が、前記外筒部材の内側に嵌合される嵌合部を有し、前記嵌合部の外周面が、前記外筒部材の内周面に接するように形成されていることが好ましい。このようにすることで、支持部材の円筒部を基体部材の円形孔に圧入する際に、支持部材の嵌合部の外周面が外筒部材の内周面に接して、支持部材の圧入方向への移動を案内することができる。そのため、円筒部が円形孔に傾いて圧入されてしまうことを抑制できる。
In the present invention, the support member has a fitting portion fitted inside the outer tubular member, and an outer peripheral surface of the fitting portion is formed so as to contact an inner peripheral surface of the outer tubular member. Preferably. By doing so, when the cylindrical portion of the support member is press-fitted into the circular hole of the base member, the outer peripheral surface of the fitting portion of the support member is in contact with the inner peripheral surface of the outer tubular member, and the press-fitting direction of the support member is You can be guided to move to. Therefore, it is possible to prevent the cylindrical portion from being inclined and press-fitted into the circular hole.
本発明において、前記支持部材が、前記外筒部材の他端における端面に当接される当接部を有していることが好ましい。このようにすることで、支持部材の当接部が外筒部材の他端における端面に当接するまで円筒部を円形孔に圧入することができる。そのため、複数の流量制御弁を組み立てた際に、支持部材の円筒部における基体部材の円形孔への圧入量を均一にすることができる。
In the present invention, it is preferable that the support member has an abutting portion that abuts on an end surface at the other end of the outer tubular member. By doing so, the cylindrical portion can be press-fitted into the circular hole until the contact portion of the support member comes into contact with the end surface at the other end of the outer tubular member. Therefore, when a plurality of flow control valves are assembled, the amount of press-fitting into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
本発明において、前記流量制御弁は、前記駆動軸を含む弁体駆動部をさらに有し、前記支持部材が、前記弁体駆動部のケースおよび前記外筒部材の内側に配置され、前記ケースと前記外筒部材とが溶接されていることが好ましい。このようにすることで、ケースと外筒部材とが直接的に溶接されて、弁体駆動部のケースと外筒部材とを個別に支持部材に溶接する構成に比べて、溶接箇所を少なくすることができる。
In the present invention, the flow rate control valve further has a valve body drive unit including the drive shaft, the support member is arranged inside the case of the valve body drive unit and the outer cylinder member, and It is preferable that the outer cylinder member is welded. By doing so, the case and the outer cylinder member are directly welded, and the number of welding points is reduced as compared with a configuration in which the case and the outer cylinder member of the valve body drive unit are individually welded to the support member. be able to.
本発明において、前記外筒部材の他端における端面が前記支持部材に当接した状態で当該外筒部材と当該支持部材とが固定されていることが好ましい。このようにすることで、複数の流量制御弁を組み立てた際に、支持部材の円筒部における基体部材の円形孔への圧入量を均一にすることができる。
In the present invention, it is preferable that the outer cylinder member and the support member are fixed in a state where the end surface at the other end of the outer cylinder member is in contact with the support member. By doing so, when assembling a plurality of flow rate control valves, the amount of press-fitting into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
上記目的を達成するために、本発明の他の一態様に係る流量制御弁の組立方法は、弁室および前記弁室に開口する弁口が設けられた基体部材と、前記基体部材の外側に配置された外筒部材と、前記弁口に対向して配置され、前記弁口を開閉する弁体と、前記弁体が先端部に設けられた駆動軸と、前記駆動軸を前記弁口と前記弁体との対向方向に移動可能に支持する支持部材と、を有し、前記基体部材は、前記弁口に連なる流路および当該流路と前記基体部材の外側とを接続する均圧孔が設けられている流量制御弁の組立方法であって、前記外筒部材の一端を前記基体部材で塞ぎ、前記基体部材に設けられた前記弁口と同軸に配置された円形孔に、前記支持部材に設けられた前記駆動軸と同軸に配置された円筒部を圧入し、前記外筒部材の他端が前記支持部材に突き当たるまで前記円筒部の圧入を進めて前記外筒部材の他端を前記支持部材で塞ぐことにより、前記基体部材の外側に前記弁室と区画された背圧室を形成するとともに、前記弁体または前記駆動軸を前記弁室と前記背圧室とをまたいで配置することを特徴とする。
In order to achieve the above object, a method for assembling a flow control valve according to another aspect of the present invention includes a base member provided with a valve chamber and a valve opening opening to the valve chamber, and a base member provided outside the base member. An outer cylinder member that is arranged, a valve body that is arranged so as to face the valve opening and that opens and closes the valve opening, a drive shaft that has the valve body provided at its tip, and the drive shaft is the valve opening. A support member movably supporting the valve body in a direction opposite to the valve body, wherein the base member is a flow passage communicating with the valve port, and a pressure equalizing hole connecting the flow passage and an outside of the base member. A method of assembling a flow rate control valve, wherein one end of the outer cylinder member is closed with the base member, and the support is provided in a circular hole arranged coaxially with the valve port provided in the base member. The cylindrical portion arranged coaxially with the drive shaft provided in the member is press-fitted, and the press-fitting of the cylindrical portion is advanced until the other end of the outer tubular member hits the support member, and the other end of the outer tubular member is pushed. A back pressure chamber that is partitioned from the valve chamber is formed on the outside of the base member by closing the support member, and the valve body or the drive shaft is arranged across the valve chamber and the back pressure chamber. It is characterized by doing.
本発明によれば、外筒部材の一端を前記基体部材で塞ぐ。基体部材に設けられた弁口と同軸に配置された円形孔に、支持部材に設けられた駆動軸と同軸に配置された円筒部を圧入する。外筒部材の他端が支持部材に突き当たるまで円筒部の圧入を進めて外筒部材の他端を支持部材で塞ぐことにより、基体部材の外側に弁室と区画された背圧室を形成するとともに、弁体または駆動軸を弁室と背圧室とをまたいで配置する。このようにしたことにより、基体部材の円形孔に支持部材の円筒部を圧入して、基体部材と支持部材とを直接組み付けることで、比較的簡易な構造で弁口と弁体との軸ずれを効果的に抑制できる。また、円筒部が円形孔に圧入されていることで、基体部材と支持部材とをより確実に組み付けることができる。また、外筒部材の他端が支持部材に突き当たるまで円筒部の圧入を進めて外筒部材の他端を支持部材で塞ぐことで、複数の流量制御弁を組み立てた際に、支持部材の円筒部における基体部材の円形孔への圧入量を均一にすることができる。
According to the present invention, one end of the outer cylinder member is closed with the base member. The cylindrical portion arranged coaxially with the drive shaft provided in the support member is press-fitted into the circular hole arranged coaxially with the valve port provided in the base member. A back pressure chamber partitioned from the valve chamber is formed outside the base member by advancing the press-fitting of the cylindrical portion until the other end of the outer tubular member hits the support member and closing the other end of the outer tubular member with the support member. At the same time, the valve element or the drive shaft is arranged across the valve chamber and the back pressure chamber. By doing so, the cylindrical portion of the support member is press-fitted into the circular hole of the base member, and the base member and the support member are directly assembled, so that the axis deviation between the valve opening and the valve body is relatively simple. Can be effectively suppressed. Further, since the cylindrical portion is press-fitted into the circular hole, the base member and the supporting member can be assembled more reliably. Further, by pressing the cylindrical portion until the other end of the outer cylinder member hits the support member and closing the other end of the outer cylinder member with the support member, when the plurality of flow control valves are assembled, the cylinder of the support member is It is possible to make the amount of press-fitting into the circular hole of the base member in the portion uniform.
本発明によれば、弁体の形状が制約されることなく弁体に対して移動方向に加わる差圧力を効果的に小さくできる。
According to the present invention, the differential pressure applied to the valve body in the moving direction can be effectively reduced without restricting the shape of the valve body.
（第１実施例）
以下、本発明の第１実施例に係る流量制御弁について、図１～図４を参照して説明する。 (First embodiment)
Hereinafter, a flow rate control valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
以下、本発明の第１実施例に係る流量制御弁について、図１～図４を参照して説明する。 (First embodiment)
Hereinafter, a flow rate control valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
図１、図２は、本発明の第１実施例に係る流量制御弁の縦断面図（開弁状態、閉弁状態）である。図３は、図１の流量制御弁の弁体およびその近傍の拡大断面図である。図４、図５は、図１の流量制御弁の変形例の構成を示す縦断面図（開弁状態、閉弁状態）である。
1 and 2 are vertical cross-sectional views (a valve open state and a valve closed state) of a flow control valve according to a first embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of the valve body of the flow control valve of FIG. 1 and its vicinity. 4 and 5 are vertical cross-sectional views (valve open state, valve closed state) showing the configuration of a modification of the flow rate control valve of FIG.
本実施例の流量制御弁１は、例えば、冷凍サイクル等において冷媒流量を調整するために使用される電動弁である。
The flow rate control valve 1 of this embodiment is an electric valve used for adjusting the flow rate of the refrigerant in, for example, a refrigeration cycle.
流量制御弁１は、弁本体５と、弁体６と、弁体駆動部８と、を有している。
The flow rate control valve 1 has a valve body 5, a valve body 6, and a valve body drive unit 8.
弁本体５は、基体部材１０と、外筒部材２０と、を有している。
The valve body 5 has a base member 10 and an outer cylinder member 20.
基体部材１０は、例えば、ステンレス材で構成されている。基体部材１０は、全体的に有底円筒状に形成されている。基体部材１０は、略円筒状の基体本体１１と、基体本体１１の下端に設けられた底壁１２とを一体的に有している。
The base member 10 is made of, for example, a stainless material. The base member 10 is formed in a bottomed cylindrical shape as a whole. The base body member 10 integrally includes a substantially cylindrical base body 11 and a bottom wall 12 provided at the lower end of the base body 11.
基体本体１１は、円柱状の空間である弁室１３が設けられている。基体本体１１は、上方に向けて開口する位置決め用の孔としての円形孔１４が設けられている。円形孔１４は、弁室１３と連なっている。本実施例において、弁室１３の径と円形孔１４の径とは同一である。
The base body 11 is provided with a valve chamber 13 which is a cylindrical space. The base body 11 is provided with a circular hole 14 as a positioning hole that opens upward. The circular hole 14 is continuous with the valve chamber 13. In this embodiment, the diameter of the valve chamber 13 and the diameter of the circular hole 14 are the same.
底壁１２には、弁室１３に開口する円形の弁口１５と、弁口１５に連なり下方に延びる流路１６と、流路１６から横方向に延びる均圧孔１７と、弁口１５を囲む弁座１８と、が設けられている。弁口１５と流路１６とは、弁室１３より小径でかつ弁室１３と同軸になるように設けられている。均圧孔１７は、流路１６と基体部材１０の外側に形成される後述の背圧室２３とを接続する。弁座１８には弁体６が着座する。
The bottom wall 12 includes a circular valve opening 15 that opens into the valve chamber 13, a flow path 16 that extends downward from the valve opening 15, a pressure equalizing hole 17 that extends laterally from the flow path 16, and a valve opening 15. A surrounding valve seat 18 is provided. The valve port 15 and the flow path 16 are provided so as to have a smaller diameter than the valve chamber 13 and to be coaxial with the valve chamber 13. The pressure equalizing hole 17 connects the flow path 16 and a back pressure chamber 23, which will be described later, formed outside the base member 10. The valve body 6 is seated on the valve seat 18.
外筒部材２０は、例えば、ステンレス材で構成されており、円筒状に形成されている。外筒部材２０は、基体部材１０の外側に配置されており、基体部材１０を内側に収容している。外筒部材２０の一端である下端２０ａに基体部材１０の底壁１２が嵌め込まれており、下端２０ａが基体部材１０によって塞がれている。外筒部材２０の下端２０ａは底壁１２にろう付けされている。
The outer cylinder member 20 is made of, for example, a stainless material, and has a cylindrical shape. The outer cylinder member 20 is arranged outside the base member 10, and accommodates the base member 10 inside. The bottom wall 12 of the base member 10 is fitted into the lower end 20 a that is one end of the outer tubular member 20, and the lower end 20 a is closed by the base member 10. The lower end 20a of the outer tubular member 20 is brazed to the bottom wall 12.
弁本体５は、外筒部材２０および基体本体１１を横方向から貫通して弁室１３に接続される第１導管２６を有している。第１導管２６は、外筒部材２０にろう付けされている。また、弁本体５は、基体本体１１の流路１６に接続される第２導管２７を有している。第２導管２７は、基体本体１１の底壁１２にろう付けされている。
The valve body 5 has a first conduit 26 that penetrates the outer cylinder member 20 and the base body 11 from the lateral direction and is connected to the valve chamber 13. The first conduit 26 is brazed to the outer cylinder member 20. Further, the valve body 5 has a second conduit 27 connected to the flow path 16 of the base body 11. The second conduit 27 is brazed to the bottom wall 12 of the base body 11.
弁体６は、例えば、ステンレス材で構成されている。弁体６は、全体的に中実（すなわち中空でない）の円柱状に形成されており、下端において下方を向く略円錐形状を有している。弁体６は、円柱状の胴部３１と、胴部３１の下端に設けられた下方を向く略円錐形状の先端部３２と、胴部３１の下端から横方向に突出した環状突出部３３と、を一体的に有している。胴部３１の上端面３１ａには、取付穴３１ｂが設けられている。取付穴３１ｂには、後述する駆動軸６４の先端部６４ｃの先端突起６４ｅが嵌合される。これにより、弁体６が駆動軸６４の先端部６４ｃに設けられる。胴部３１には、取付穴３１ｂから横方向に貫通する横孔３１ｃが設けられている。横孔３１ｃによって、取付穴３１ｂ内の流体圧力と弁体６の外側との流体圧力とを同一にして、取付穴３１ｂから先端突起６４ｅが抜けてしまうことを抑制している。
The valve body 6 is made of, for example, a stainless material. The valve body 6 is formed in a solid (that is, not hollow) columnar shape as a whole, and has a substantially conical shape that faces downward at the lower end. The valve body 6 includes a cylindrical body portion 31, a downwardly facing substantially conical tip portion 32 provided at a lower end of the body portion 31, and an annular protruding portion 33 protruding laterally from the lower end of the body portion 31. , Are integrally provided. A mounting hole 31b is provided in the upper end surface 31a of the body portion 31. A tip projection 64e of a tip portion 64c of the drive shaft 64, which will be described later, is fitted into the mounting hole 31b. As a result, the valve body 6 is provided at the tip portion 64c of the drive shaft 64. The body portion 31 is provided with a lateral hole 31c penetrating laterally from the mounting hole 31b. The lateral hole 31c makes the fluid pressure inside the mounting hole 31b equal to the fluid pressure outside the valve body 6 and prevents the tip projection 64e from coming off from the mounting hole 31b.
弁体６は、弁室１３内に弁口１５と上下方向に対向して配置されている。弁体６は、弁体駆動部８によって上下方向に移動され、弁口１５を開閉する。上下方向は、弁口１５と弁体６との対向方向であり、かつ、弁体６の移動方向である。弁体６が、弁座１８から離れると弁口１５が開いて開弁状態となる。開弁状態において、第１導管２６と第２導管２７とが弁室１３を介して接続される。弁体６が、弁座１８に接する（着座する）と弁口１５が閉じて閉弁状態となる。閉弁状態において、第１導管２６と第２導管２７とが遮断される。
The valve body 6 is arranged in the valve chamber 13 so as to face the valve opening 15 in the vertical direction. The valve body 6 is vertically moved by the valve body drive unit 8 to open and close the valve port 15. The up-down direction is a direction in which the valve opening 15 and the valve body 6 face each other, and a moving direction of the valve body 6. When the valve body 6 separates from the valve seat 18, the valve port 15 opens and the valve is opened. In the valve open state, the first conduit 26 and the second conduit 27 are connected via the valve chamber 13. When the valve body 6 contacts (seats) the valve seat 18, the valve opening 15 is closed and the valve is closed. In the valve closed state, the first conduit 26 and the second conduit 27 are shut off.
弁体６の先端部３２は、中実構成を有するので先端部３２の形状に制約がない。そのため、弁体６の先端部３２の形状に、流量特性としてイコールパーセント特性またはそれに近い特性を得られるように設計された形状を採用することができる。このような形状として、例えば、楕円面または複数段の円すい状のテーパ面部を有する形状がある。複数段の円すい状のテーパ面部は、楕円面を疑似するように、弁口１５側に近づくにしたがってテーパ角度が段階的に大きくなる。または、弁体６の先端部３２の形状に、流量特性としてリニア特性を得られるように設計された形状を採用することもできる。
Since the tip portion 32 of the valve body 6 has a solid structure, there is no restriction on the shape of the tip portion 32. Therefore, the shape of the tip portion 32 of the valve body 6 can be a shape designed to obtain an equal percent characteristic or a characteristic close to it as a flow rate characteristic. As such a shape, for example, there is a shape having an elliptical surface or a plurality of conical tapered surface portions. The taper angle of the tapered surface having a plurality of conical shapes gradually increases toward the valve port 15 side so as to simulate an elliptical surface. Alternatively, the tip portion 32 of the valve body 6 may have a shape designed to obtain a linear characteristic as a flow rate characteristic.
弁体駆動部８は、弁本体５の上部に取り付けられている。弁体駆動部８は、弁体６を上下方向に移動させることにより弁座１８に対して接離させて、弁口１５を閉じたり開いたりする。弁体駆動部８は、ケースとしてのキャン４０と、モーター部５０と、駆動機構部６０と、ホルダー７０と、を有している。
The valve body drive unit 8 is attached to the upper portion of the valve body 5. The valve body drive unit 8 moves the valve body 6 in the vertical direction to bring the valve body 6 into and out of contact with the valve seat 18, thereby closing or opening the valve port 15. The valve body drive unit 8 includes a can 40 as a case, a motor unit 50, a drive mechanism unit 60, and a holder 70.
キャン４０は、例えば、ステンレス材で構成されている。キャン４０は、上端が塞がれた円筒状に形成されている。キャン４０の下端４０ａに後述するホルダー７０（具体的にはホルダー本体７１）が嵌め込まれており、下端４０ａがホルダー７０により塞がれている。キャン４０の下端４０ａはホルダー７０に溶接されている。
The can 40 is made of, for example, a stainless material. The can 40 is formed in a cylindrical shape whose upper end is closed. A holder 70 (specifically, a holder body 71) described later is fitted into the lower end 40a of the can 40, and the lower end 40a is closed by the holder 70. The lower end 40a of the can 40 is welded to the holder 70.
モーター部５０は、キャン４０の内側に回転可能に収容されたローター５１と、キャン４０の外側に配置されたステーター５２と、を有している。ステーター５２は、ヨーク５３、ボビン５４、ステーターコイル５５および樹脂モールドカバー５６などで構成されている。ローター５１とステーター５２とでステッピングモーターを構成している。
The motor unit 50 has a rotor 51 rotatably housed inside the can 40 and a stator 52 arranged outside the can 40. The stator 52 includes a yoke 53, a bobbin 54, a stator coil 55, a resin mold cover 56, and the like. The rotor 51 and the stator 52 form a stepping motor.
駆動機構部６０は、ガイドブッシュ６１と、弁軸ホルダー６２と、ストッパ機構６３と、駆動軸６４と、封止部材６５と、を有している。
The drive mechanism unit 60 includes a guide bush 61, a valve shaft holder 62, a stopper mechanism 63, a drive shaft 64, and a sealing member 65.
ガイドブッシュ６１は、円筒状の小径部６１ａと、小径部６１ａの下端に同軸に連なる円筒状の大径部６１ｂとを一体的に有している。小径部６１ａの内径と大径部６１ｂの内径とは同一である。小径部６１ａの外周面には雄ねじ６１ｃが設けられている。小径部６１ａには、横方向に貫通する横孔６１ｄが設けられている。
The guide bush 61 integrally includes a cylindrical small-diameter portion 61a and a cylindrical large-diameter portion 61b coaxially connected to the lower end of the small-diameter portion 61a. The inner diameter of the small diameter portion 61a and the inner diameter of the large diameter portion 61b are the same. A male screw 61c is provided on the outer peripheral surface of the small diameter portion 61a. The small diameter portion 61a is provided with a lateral hole 61d penetrating in the lateral direction.
弁軸ホルダー６２は、上端が塞がれた円筒状に形成されている。弁軸ホルダー６２は、円筒状の周壁部６２ａと、周壁部６２ａの上端を塞ぐ上壁部６２ｂと、を一体的に有している。周壁部６２ａの内周面には、ガイドブッシュ６１の雄ねじ６１ｃと螺合される雌ねじ６２ｃが設けられている。上壁部６２ｂは、当該上壁部６２ｂにかしめ固定された支持リング６６を介してローター５１と一体的に連結されている。そのため、ローター５１が回転すると弁軸ホルダー６２も回転する。そして、弁軸ホルダー６２が回転すると、雄ねじ６１ｃと雌ねじ６２ｃとの送りねじ作用により、弁軸ホルダー６２がガイドブッシュ６１の軸方向（上下方向）に移動する。なお、弁軸ホルダー６２の上方には、雄ねじ６１ｃと雌ねじ６２ｃとの螺合が外れたときに再度螺合しやすくするためのコイルばねからなる復帰ばね６７が設けられている。
The valve shaft holder 62 is formed in a cylindrical shape with its upper end closed. The valve shaft holder 62 integrally has a cylindrical peripheral wall portion 62a and an upper wall portion 62b that closes the upper end of the peripheral wall portion 62a. On the inner peripheral surface of the peripheral wall portion 62a, a female screw 62c that is screwed into the male screw 61c of the guide bush 61 is provided. The upper wall portion 62b is integrally connected to the rotor 51 via a support ring 66 that is caulked and fixed to the upper wall portion 62b. Therefore, when the rotor 51 rotates, the valve shaft holder 62 also rotates. Then, when the valve shaft holder 62 rotates, the valve shaft holder 62 moves in the axial direction (vertical direction) of the guide bush 61 due to the feed screw action of the male screw 61c and the female screw 62c. A return spring 67 is provided above the valve shaft holder 62. The return spring 67 is a coil spring that facilitates re-engagement of the male screw 61c and the female screw 62c when they are disengaged from each other.
ストッパ機構６３は、ガイドブッシュ６１に固定された下ストッパ体６３ａと、弁軸ホルダー６２に固定された上ストッパ体６３ｂと、を有している。ストッパ機構６３は、弁軸ホルダー６２が下限位置に到達すると、下ストッパ体６３ａと上ストッパ体６３ｂとが互いに突き当たり、ガイドブッシュ６１に対する弁軸ホルダー６２の移動を規制する。
The stopper mechanism 63 has a lower stopper body 63a fixed to the guide bush 61 and an upper stopper body 63b fixed to the valve shaft holder 62. When the valve shaft holder 62 reaches the lower limit position, the stopper mechanism 63 restricts the movement of the valve shaft holder 62 with respect to the guide bush 61 by abutting the lower stopper body 63a and the upper stopper body 63b against each other.
駆動軸６４は、全体的に長尺の円柱状に形成されている。駆動軸６４は、ガイドブッシュ６１に挿通され、ガイドブッシュ６１と同軸に配置される。駆動軸６４は、上端部６４ａと胴部６４ｂと先端部６４ｃとが上方から下方に順に一体的に設けられている。上端部６４ａは、胴部６４ｂより小径に形成されており、弁軸ホルダー６２の上壁部６２ｂの貫通孔に挿通されている。上端部６４ａには、プッシュナット６４ｄが固着されている。胴部６４ｂは、上下方向に摺動可能にガイドブッシュ６１に支持されている。上端部６４ａと胴部６４ｂとの段部と、弁軸ホルダー６２の上壁部６２ｂとの間には、駆動軸６４を常時下方に向けて押す圧縮コイルばね６８が設けられている。プッシュナット６４ｄと圧縮コイルばね６８が設けられていることにより、弁軸ホルダー６２の移動に伴って駆動軸６４が上下方向に移動する。先端部６４ｃには、弁体６の胴部３１の取付穴３１ｂに嵌合される細身の先端突起６４ｅが設けられている。また、駆動軸６４は、胴部６４ｂの下端に横方向に突出するフランジ部６４ｆが一体的に設けられている。フランジ部６４ｆの径は、弁体６の胴部３１の径と同一である。
The drive shaft 64 is formed in a generally long cylindrical shape. The drive shaft 64 is inserted into the guide bush 61 and arranged coaxially with the guide bush 61. The drive shaft 64 has an upper end portion 64a, a body portion 64b, and a tip end portion 64c that are integrally provided in order from the upper side to the lower side. The upper end portion 64a has a smaller diameter than the body portion 64b, and is inserted into the through hole of the upper wall portion 62b of the valve shaft holder 62. A push nut 64d is fixed to the upper end 64a. The body portion 64b is supported by the guide bush 61 so as to be vertically slidable. A compression coil spring 68 that constantly pushes the drive shaft 64 downward is provided between the stepped portion of the upper end portion 64a and the body portion 64b and the upper wall portion 62b of the valve shaft holder 62. Since the push nut 64d and the compression coil spring 68 are provided, the drive shaft 64 moves in the vertical direction as the valve shaft holder 62 moves. The tip 64c is provided with a slender tip projection 64e that is fitted into the mounting hole 31b of the body 31 of the valve body 6. Further, the drive shaft 64 is integrally provided with a flange portion 64f protruding laterally at the lower end of the body portion 64b. The diameter of the flange portion 64f is the same as the diameter of the body portion 31 of the valve body 6.
封止部材６５は、円環状に形成されている。封止部材６５は、駆動軸６４の先端部６４ｃが内側に嵌め込まれている。すなわち、封止部材６５は、駆動軸６４の先端部６４ｃが貫通している。封止部材６５は、フランジ部６４ｆと弁体６の胴部３１の上端面３１ａとの間に挟まれて配置されている。本実施例において、封止部材６５は、ゴム材からなるＯリング６５ａの外側にポリテトラフルオロエチレン（ＰＴＦＥ）製のリング状のパッキン６５ｂが設けられている。
The sealing member 65 is formed in an annular shape. The tip portion 64c of the drive shaft 64 is fitted inside the sealing member 65. That is, the end portion 64c of the drive shaft 64 penetrates the sealing member 65. The sealing member 65 is disposed so as to be sandwiched between the flange portion 64f and the upper end surface 31a of the body portion 31 of the valve body 6. In this embodiment, the sealing member 65 is provided with a ring-shaped packing 65b made of polytetrafluoroethylene (PTFE) on the outside of an O-ring 65a made of a rubber material.
ホルダー７０は、例えば、ステンレス材で構成されている。ホルダー７０は、略円板状のホルダー本体７１と、位置決め用の突部としての円筒部７２と、を一体的に有している。円筒部７２は、ホルダー本体７１の下面７１ａから下方に向けて突出している。
The holder 70 is made of, for example, a stainless material. The holder 70 integrally has a substantially disk-shaped holder main body 71 and a cylindrical portion 72 as a protrusion for positioning. The cylindrical portion 72 projects downward from the lower surface 71a of the holder body 71.
ホルダー本体７１は、下面７１ａに外筒部材２０の他端としての上端２０ｂの端面２０ｃが当接した状態で、当該上端２０ｂがホルダー本体７１に溶接されている。外筒部材２０の上端２０ｂはホルダー本体７１により塞がれている。これにより、弁室１３と区画された背圧室２３が、基体部材１０と外筒部材２０とホルダー本体７１とによって形成される。また、キャン４０の下端４０ａがホルダー本体７１に溶接されている。
The holder main body 71 is welded to the holder main body 71 with the lower end 71a being in contact with the end surface 20c of the upper end 20b as the other end of the outer tubular member 20. The upper end 20b of the outer cylinder member 20 is closed by the holder body 71. As a result, the back pressure chamber 23 partitioned from the valve chamber 13 is formed by the base member 10, the outer cylinder member 20, and the holder body 71. Further, the lower end 40 a of the can 40 is welded to the holder body 71.
ホルダー本体７１の上面の中央には、円筒部７２と同軸に配置された円形の圧入穴７１ｂが設けられている。圧入穴７１ｂには、ガイドブッシュ６１の大径部６１ｂが圧入される。これにより、ガイドブッシュ６１と円筒部７２とが同軸に配置された状態で、ホルダー本体７１とガイドブッシュ６１とが一体化される。ホルダー７０とガイドブッシュ６１とは、駆動軸６４を弁口１５と弁体６との対向方向に移動可能に支持する支持部材６９を構成する。圧入穴７１ｂの底面の中央には、駆動軸６４の胴部６４ｂが挿通される軸孔７１ｃが設けられている。ホルダー本体７１の周縁部には、上下方向に貫通する縦孔７１ｄが設けられている。
A circular press-fitting hole 71b arranged coaxially with the cylindrical portion 72 is provided in the center of the upper surface of the holder body 71. The large diameter portion 61b of the guide bush 61 is press-fitted into the press-fitting hole 71b. Thus, the holder body 71 and the guide bush 61 are integrated with each other in a state where the guide bush 61 and the cylindrical portion 72 are coaxially arranged. The holder 70 and the guide bush 61 constitute a support member 69 that supports the drive shaft 64 so as to be movable in the direction in which the valve opening 15 and the valve body 6 face each other. A shaft hole 71c into which the body portion 64b of the drive shaft 64 is inserted is provided at the center of the bottom surface of the press-fitting hole 71b. A vertical hole 71d penetrating in the vertical direction is provided in the peripheral portion of the holder body 71.
円筒部７２は、基体部材１０の円形孔１４に圧入されている。これにより、ホルダー７０が基体部材１０と直接組み付けられるとともに、円筒部７２と円形孔１４とが同軸に配置される。円筒部７２と弁口１５も同軸に配置される。また、円形孔１４に円筒部７２が挿入されることにより、円形孔１４は円筒部７２の上下方向（対向方向）と直交する方向への移動を規制する。
The cylindrical portion 72 is press-fitted into the circular hole 14 of the base member 10. As a result, the holder 70 is directly assembled to the base member 10, and the cylindrical portion 72 and the circular hole 14 are coaxially arranged. The cylindrical portion 72 and the valve port 15 are also arranged coaxially. Further, by inserting the cylindrical portion 72 into the circular hole 14, the circular hole 14 restricts the movement of the cylindrical portion 72 in a direction orthogonal to the vertical direction (opposing direction).
円筒部７２の内側には、弁体６の胴部３１と、駆動軸６４の先端部６４ｃおよびフランジ部６４ｆと、封止部材６５と、が上下方向に移動可能に配置される。封止部材６５の外周に配置されたパッキン６５ｂは、円筒部７２の内面に押し付けられている。これにより、封止部材６５は、弁室１３と背圧室２３との間を封止している。駆動軸６４の上下方向の移動に伴い、封止部材６５が円筒部７２の内周面に摺動される。円筒部７２の上端には、横方向に貫通する横孔７２ａが設けられている。本実施例において、円筒部７２の内径（すなわち、封止部材６５により封止される封止箇所の径）は、弁口１５の径と同一である。円筒部７２の内径は、弁口１５の径と異なっていてもよいが、それらの差を小さくすることが好ましい。
Inside the cylindrical portion 72, the body portion 31 of the valve body 6, the tip portion 64c and the flange portion 64f of the drive shaft 64, and the sealing member 65 are arranged so as to be vertically movable. The packing 65b arranged on the outer periphery of the sealing member 65 is pressed against the inner surface of the cylindrical portion 72. Thereby, the sealing member 65 seals between the valve chamber 13 and the back pressure chamber 23. The sealing member 65 slides on the inner peripheral surface of the cylindrical portion 72 as the drive shaft 64 moves in the vertical direction. A lateral hole 72a penetrating in the lateral direction is provided at the upper end of the cylindrical portion 72. In this embodiment, the inner diameter of the cylindrical portion 72 (that is, the diameter of the sealing portion sealed by the sealing member 65) is the same as the diameter of the valve port 15. The inner diameter of the cylindrical portion 72 may be different from the diameter of the valve port 15, but it is preferable to reduce the difference between them.
流量制御弁１は、駆動軸６４の先端部６４ｃに嵌め込まれた封止部材６５により弁室１３と背圧室２３とが封止されていることから、駆動軸６４が弁室１３と背圧室２３とにまたがって配置されている。そして、基体部材１０の流路１６と背圧室２３とが、基体部材１０の均圧孔１７により接続されている。背圧室２３とキャン４０の内側空間４１とがホルダー本体７１の縦孔７１ｄにより接続されている。そのため、閉弁状態において、流路１６の流体圧力と背圧室２３の流体圧力とが同一となり、弁体６に対して弁口１５側から加わる流体圧力と背圧室２３側から加わる流体圧力との差（差圧力）が小さくなる。本実施例では、弁口１５の径（図３に両矢印Ｄ１で示す）とホルダー７０の円筒部７２の内径（図３に両矢印Ｄ２で示す）とを同一にしている。そのため、差圧力は零（ほぼ零含む）になり、差圧力によって弁体６の移動が妨げられることを効果的に抑制できる。
In the flow rate control valve 1, since the valve chamber 13 and the back pressure chamber 23 are sealed by the sealing member 65 fitted to the tip end portion 64 c of the drive shaft 64, the drive shaft 64 is connected to the valve chamber 13 and the back pressure chamber 23. It is arranged across the chamber 23. The flow path 16 of the base member 10 and the back pressure chamber 23 are connected by the pressure equalizing hole 17 of the base member 10. The back pressure chamber 23 and the inner space 41 of the can 40 are connected by a vertical hole 71d of the holder body 71. Therefore, in the valve closed state, the fluid pressure in the flow path 16 and the fluid pressure in the back pressure chamber 23 become the same, and the fluid pressure applied to the valve body 6 from the valve port 15 side and the fluid pressure applied from the back pressure chamber 23 side. The difference (pressure difference) with In this embodiment, the diameter of the valve port 15 (shown by a double-headed arrow D1 in FIG. 3) and the inner diameter of the cylindrical portion 72 of the holder 70 (shown by a double-headed arrow D2 in FIG. 3) are the same. Therefore, the differential pressure becomes zero (including almost zero), and it is possible to effectively prevent the movement of the valve body 6 from being hindered by the differential pressure.
円筒部７２の内側におけるフランジ部６４ｆより上方の空間７２ｂは、横孔７２ａにより背圧室２３に接続されている。さらに空間７２ｂは、キャン４０の内側空間４１、ガイドブッシュ６１の横孔６１ｄ、ガイドブッシュ６１と駆動軸６４との隙間、および、ホルダー７０の軸孔７１ｃによっても背圧室２３に接続されている。これにより、フランジ部６４ｆの移動により空間７２ｂの流体圧力が変化した場合でも、空間７２ｂの流体圧力が速やかに背圧室２３の流体圧力と同一になる。
A space 72b above the flange portion 64f inside the cylindrical portion 72 is connected to the back pressure chamber 23 by a lateral hole 72a. Further, the space 72b is also connected to the back pressure chamber 23 by the inner space 41 of the can 40, the lateral hole 61d of the guide bush 61, the gap between the guide bush 61 and the drive shaft 64, and the shaft hole 71c of the holder 70. .. Accordingly, even if the fluid pressure in the space 72b changes due to the movement of the flange portion 64f, the fluid pressure in the space 72b quickly becomes the same as the fluid pressure in the back pressure chamber 23.
次に、上述した流量制御弁１の組立方法について説明する。
Next, a method for assembling the flow control valve 1 described above will be described.
（１）弁本体５を組み立てる。具体的には、外筒部材２０の下端２０ａに基体部材１０を嵌め込み、当該下端２０ａを塞ぐ。第１導管２６を外筒部材２０および基体部材１０の基体本体１１に嵌め込む。第２導管２７を基体部材１０の底壁１２に嵌め込む。そして、各ろう付け箇所にろう材を設置して炉に投入することによりろう付けする。
(1) Assemble the valve body 5. Specifically, the base member 10 is fitted into the lower end 20a of the outer tubular member 20 to close the lower end 20a. The first conduit 26 is fitted into the outer cylinder member 20 and the base body 11 of the base member 10. The second conduit 27 is fitted into the bottom wall 12 of the base member 10. Then, a brazing material is installed at each brazing location and is put into a furnace for brazing.
（２）弁体駆動部８を組み立てる。具体的には、ホルダー本体７１の圧入穴７１ｂに、ガイドブッシュ６１の大径部６１ｂを圧入して、ホルダー本体７１とガイドブッシュ６１とを一体化する。ガイドブッシュ６１の雄ねじ６１ｃに、弁軸ホルダー６２の雌ねじ６２ｃを螺合する。ガイドブッシュ６１には、下ストッパ体６３ａがあらかじめ取り付けられている。弁軸ホルダー６２には、上ストッパ体６３ｂがあらかじめ取り付けられている。また、弁軸ホルダー６２には、支持リング６６を介してローター５１があらかじめ連結されている。封止部材６５に駆動軸６４の先端部６４ｃを嵌め込み、先端部６４ｃの先端突起６４ｅを弁体６の取付穴３１ｂに嵌合して駆動軸６４に弁体６を取り付ける。ホルダー７０の円筒部７２、ホルダー７０の軸孔７１ｃおよびガイドブッシュ６１に下方から駆動軸６４を挿入する。駆動軸６４の上端部６４ａに圧縮コイルばね６８を設置して、上端部６４ａを弁軸ホルダー６２の上壁部６２ｂの貫通孔に挿入する。駆動軸６４の上端部６４ａにプッシュナット６４ｄを固着し、復帰ばね６７を配置する。そして、ローター５１、ガイドブッシュ６１、弁軸ホルダー６２およびストッパ機構６３等を組み付けた組付体をキャン４０の内側に挿入する。キャン４０の下端４０ａにホルダー本体７１を嵌め込み、当該下端４０ａをホルダー本体７１で塞ぐ。キャン４０の下端４０ａをホルダー本体７１に溶接する。ステーター５２をキャン４０に取り付ける。この状態において、駆動軸６４および弁体６は、円筒部７２と同軸に配置されている。
(2) Assemble the valve body drive unit 8. Specifically, the large diameter portion 61b of the guide bush 61 is press-fitted into the press-fitting hole 71b of the holder body 71 to integrate the holder body 71 and the guide bush 61. The male screw 61c of the guide bush 61 is screwed into the female screw 62c of the valve shaft holder 62. A lower stopper body 63a is attached to the guide bush 61 in advance. An upper stopper body 63b is attached to the valve shaft holder 62 in advance. Further, the rotor 51 is previously connected to the valve shaft holder 62 via a support ring 66. The tip 64c of the drive shaft 64 is fitted into the sealing member 65, and the tip projection 64e of the tip 64c is fitted into the mounting hole 31b of the valve body 6 to mount the valve body 6 on the drive shaft 64. The drive shaft 64 is inserted into the cylindrical portion 72 of the holder 70, the shaft hole 71c of the holder 70, and the guide bush 61 from below. The compression coil spring 68 is installed on the upper end portion 64a of the drive shaft 64, and the upper end portion 64a is inserted into the through hole of the upper wall portion 62b of the valve shaft holder 62. A push nut 64d is fixed to the upper end 64a of the drive shaft 64, and a return spring 67 is arranged. Then, the assembled body in which the rotor 51, the guide bush 61, the valve shaft holder 62, the stopper mechanism 63 and the like are assembled is inserted into the can 40. The holder main body 71 is fitted into the lower end 40a of the can 40, and the lower end 40a is closed by the holder main body 71. The lower end 40a of the can 40 is welded to the holder body 71. Attach the stator 52 to the can 40. In this state, the drive shaft 64 and the valve body 6 are arranged coaxially with the cylindrical portion 72.
（３）そして、弁本体５と弁体駆動部８とを組み付ける。具体的には、基体部材１０の円形孔１４に円筒部７２を圧入する。外筒部材２０の上端２０ｂの端面２０ｃがホルダー本体７１に当接するまで円筒部７２の圧入を進めて当該上端２０ｂをホルダー本体７１で塞ぐことにより、基体部材１０の外側に弁室１３と区画された背圧室２３を形成する。同時に、駆動軸６４を弁室１３と背圧室２３とをまたいで配置する。最後に、外筒部材２０の上端２０ｂをホルダー本体７１に溶接する。このようにして、流量制御弁１が完成する。
(3) Then, the valve body 5 and the valve body drive unit 8 are assembled. Specifically, the cylindrical portion 72 is press-fitted into the circular hole 14 of the base member 10. The press-fitting of the cylindrical portion 72 is advanced until the end surface 20c of the upper end 20b of the outer tubular member 20 contacts the holder main body 71, and the upper end 20b is closed by the holder main body 71, so that the valve chamber 13 is partitioned outside the base member 10. The back pressure chamber 23 is formed. At the same time, the drive shaft 64 is arranged so as to straddle the valve chamber 13 and the back pressure chamber 23. Finally, the upper end 20b of the outer cylinder member 20 is welded to the holder body 71. In this way, the flow control valve 1 is completed.
以上より、本実施例の流量制御弁１によれば、外筒部材２０の下端２０ａが基体部材１０により塞がれ、かつ、外筒部材２０の上端２０ｂがホルダー本体７１により塞がれており、弁室１３と区画された背圧室２３が形成されている。駆動軸６４が弁室１３と背圧室２３とをまたいで配置されている。そして、基体部材１０は、弁口１５に連なる流路１６および当該流路１６と背圧室２３とを接続する均圧孔１７が設けられている。このようにしたことから、基体部材１０に設けられた均圧孔１７によって、閉弁状態において、弁体６に対して弁口１５側から加わる流体圧力と背圧室２３側から加わる流体圧力との差を小さくすることができる。そのため、弁体６の形状が制約されることなく弁体６に対して移動方向に加わる差圧力を効果的に小さくできる。
As described above, according to the flow control valve 1 of the present embodiment, the lower end 20a of the outer tubular member 20 is closed by the base member 10, and the upper end 20b of the outer tubular member 20 is closed by the holder main body 71. A back pressure chamber 23 that is partitioned from the valve chamber 13 is formed. The drive shaft 64 is arranged so as to straddle the valve chamber 13 and the back pressure chamber 23. Further, the base member 10 is provided with a flow passage 16 which is continuous with the valve port 15 and a pressure equalizing hole 17 which connects the flow passage 16 and the back pressure chamber 23. As a result, the pressure equalizing hole 17 provided in the base member 10 allows the fluid pressure applied from the valve port 15 side and the fluid pressure applied from the back pressure chamber 23 side to the valve body 6 in the valve closed state. The difference between can be reduced. Therefore, the differential pressure applied to the valve body 6 in the moving direction can be effectively reduced without restricting the shape of the valve body 6.
また、流量制御弁１は、駆動軸６４が貫通する環状に形成され、弁室１３と背圧室２３との間を封止する封止部材６５を有している。そして、円筒部７２の内径（封止部材６５が封止する封止箇所の径であり、図３の両矢印Ｄ２で示す）が、弁口１５の径（図３の両矢印Ｄ１で示す）と同一である。このようにすることで、閉弁状態において、弁体６に対して弁口１５側から加わる流体圧力と背圧室２３側から加わる流体圧力との差を零にすることができる。そのため、弁体６の形状が制約されることなく弁体６に対して移動方向に加わる差圧力をより効果的に小さくできる。
Further, the flow rate control valve 1 has a sealing member 65 which is formed in an annular shape through which the drive shaft 64 penetrates and seals between the valve chamber 13 and the back pressure chamber 23. The inner diameter of the cylindrical portion 72 (the diameter of the sealing portion sealed by the sealing member 65, which is indicated by the double-headed arrow D2 in FIG. 3) is the diameter of the valve opening 15 (indicated by the double-headed arrow D1 in FIG. 3). Is the same as By doing so, the difference between the fluid pressure applied to the valve body 6 from the valve port 15 side and the fluid pressure applied from the back pressure chamber 23 side to the valve body 6 can be zero in the valve closed state. Therefore, the differential pressure applied to the valve body 6 in the moving direction can be reduced more effectively without restricting the shape of the valve body 6.
また、流量制御弁１は、基体部材１０に弁口１５と同軸に配置された円形孔１４が設けられ、ホルダー７０に駆動軸６４と同軸に配置された円筒部７２が設けられている。そして、円筒部７２は円形孔１４に圧入される。このようにすることで、基体部材１０とホルダー７０とを直接組み付けて、比較的簡易な構成で弁口１５と弁体６との軸ずれを効果的に抑制できる。また、圧入により基体部材１０とホルダー７０とをより確実に組み付けることができる。
Further, in the flow control valve 1, the base member 10 is provided with the circular hole 14 coaxially arranged with the valve port 15, and the holder 70 is provided with the cylindrical portion 72 coaxially arranged with the drive shaft 64. Then, the cylindrical portion 72 is press-fitted into the circular hole 14. By doing so, it is possible to directly assemble the base member 10 and the holder 70 and effectively suppress the axial deviation between the valve port 15 and the valve body 6 with a relatively simple configuration. Further, the base member 10 and the holder 70 can be assembled more reliably by press fitting.
また、外筒部材２０の上端２０ｂの端面２０ｃがホルダー本体７１に当接した状態で、外筒部材２０とホルダー本体７１とが溶接により固定されている。このようにすることで、複数の流量制御弁１を組み立てた際に、円筒部７２の基体部材１０の円形孔１４への圧入量を均一にすることができる。
Also, the outer cylinder member 20 and the holder body 71 are fixed by welding in a state where the end surface 20c of the upper end 20b of the outer cylinder member 20 is in contact with the holder body 71. By doing so, when assembling the plurality of flow rate control valves 1, the amount of press-fitting of the cylindrical portion 72 into the circular hole 14 of the base member 10 can be made uniform.
上述した実施例では、ホルダー７０の円筒部７２を基体部材１０の円形孔１４に圧入する構成であったが、これ以外の構成を採用してもよい。例えば、円筒部７２を円形孔１４に挿入するとともに、円筒部７２の外周面と円形孔１４の内周面との間にＯリングなどの封止部材を設けた構成を採用してもよい。
In the above-described embodiment, the cylindrical portion 72 of the holder 70 is press-fitted into the circular hole 14 of the base member 10, but other configurations may be adopted. For example, a configuration may be adopted in which the cylindrical portion 72 is inserted into the circular hole 14 and a sealing member such as an O-ring is provided between the outer peripheral surface of the cylindrical portion 72 and the inner peripheral surface of the circular hole 14.
また、上述した実施例では、弁体６と駆動軸６４とが別体で構成されていたが、例えば、図４、図５に示す流量制御弁１Ａのように、弁体６と駆動軸６４とを一体的に構成してもよい。この構成では、弁体６が駆動軸６４を含み、弁体６が弁室１３と背圧室２３とをまたいで配置されている。そして、封止部材６５が、弁体６が貫通する環状に形成され、弁室１３と背圧室２３との間を封止する。
In addition, in the above-described embodiment, the valve body 6 and the drive shaft 64 are configured separately, but the valve body 6 and the drive shaft 64 are, for example, as in the flow control valve 1A shown in FIGS. 4 and 5. And may be integrally configured. In this configuration, the valve body 6 includes the drive shaft 64, and the valve body 6 is arranged so as to straddle the valve chamber 13 and the back pressure chamber 23. Then, the sealing member 65 is formed in an annular shape through which the valve body 6 penetrates, and seals between the valve chamber 13 and the back pressure chamber 23.
また、上述した実施例では、基体部材１０に、位置決め用の孔としての円形孔１４が設けられ、ホルダー７０に、位置決め用の突部としての円筒部７２が設けられていたが、これとは逆に、基体部材１０に位置決め用の突部を設け、ホルダー７０に位置決め用の孔を設けてもよい。
Further, in the above-described embodiment, the base member 10 is provided with the circular hole 14 as a positioning hole, and the holder 70 is provided with the cylindrical portion 72 as a positioning protrusion. Conversely, the base member 10 may be provided with a positioning projection, and the holder 70 may be provided with a positioning hole.
（第２実施例）
以下、本発明の第２実施例に係る流量制御弁について、図６を参照して説明する。 (Second embodiment)
Hereinafter, a flow rate control valve according to the second embodiment of the present invention will be described with reference to FIG.
以下、本発明の第２実施例に係る流量制御弁について、図６を参照して説明する。 (Second embodiment)
Hereinafter, a flow rate control valve according to the second embodiment of the present invention will be described with reference to FIG.
図６は、本発明の第２実施例に係る流量制御弁の弁体およびその近傍の拡大断面図である。図６に示す第２実施例に係る流量制御弁２において、上記流量制御弁１と同一の構成については同一の符号を付して説明を省略する。
FIG. 6 is an enlarged cross-sectional view of the valve body of the flow control valve according to the second embodiment of the present invention and the vicinity thereof. In the flow rate control valve 2 according to the second embodiment shown in FIG. 6, the same components as those of the flow rate control valve 1 are designated by the same reference numerals and their description is omitted.
流量制御弁２は、流量制御弁１のホルダー７０と構成の異なるホルダー７０Ａを有する。
The flow control valve 2 has a holder 70A having a different structure from the holder 70 of the flow control valve 1.
ホルダー７０Ａは、例えば、ステンレス材で構成されている。ホルダー７０Ａは、略円板状のホルダー本体７１Ａと、位置決め用の突部としての円筒状の円筒部７２Ａと、を一体的に有している。円筒部７２Ａは、ホルダー本体７１Ａの下面７１ａから下方に向けて突出している。
The holder 70A is made of, for example, a stainless material. The holder 70A integrally includes a substantially disk-shaped holder main body 71A and a cylindrical cylindrical portion 72A as a protrusion for positioning. The cylindrical portion 72A projects downward from the lower surface 71a of the holder body 71A.
ホルダー本体７１Ａは、外径が外筒部材２０の内径と同一である。ホルダー本体７１Ａは、嵌合部に相当し、外筒部材２０の上端２０ｂの内側に嵌合されている。外筒部材２０の上端２０ｂはホルダー本体７１Ａにより塞がれている。ホルダー７０Ａとガイドブッシュ６１とは、支持部材６９Ａを構成する。支持部材６９Ａは、キャン４０および外筒部材２０の内側に配置されている。キャン４０の下端４０ａは、外筒部材２０の上端２０ｂに溶接されている。キャン４０と外筒部材２０とを直接溶接することで、キャン４０と外筒部材２０とを個別にホルダー７０に溶接する第１実施例の流量制御弁１より溶接箇所を少なくすることができる。
The outer diameter of the holder body 71A is the same as the inner diameter of the outer tubular member 20. The holder main body 71A corresponds to a fitting portion and is fitted inside the upper end 20b of the outer tubular member 20. The upper end 20b of the outer cylinder member 20 is closed by the holder body 71A. The holder 70A and the guide bush 61 form a support member 69A. The support member 69A is arranged inside the can 40 and the outer cylinder member 20. The lower end 40a of the can 40 is welded to the upper end 20b of the outer tubular member 20. By directly welding the can 40 and the outer cylinder member 20, it is possible to reduce the number of welding points as compared with the flow control valve 1 of the first embodiment in which the can 40 and the outer cylinder member 20 are individually welded to the holder 70.
円筒部７２Ａは、先端部である圧入端部７２ｃと、本体部７２ｄと、を有している。圧入端部７２ｃと本体部７２ｄとは上下方向に連なっている。本体部７２ｄは、圧入端部７２ｃより大径に形成されている。圧入端部７２ｃと本体部７２ｄとの間には段部７２ｅが形成されている。圧入端部７２ｃは、段部７２ｅが基体部材１０に当接するまで円形孔１４に圧入されている。これにより、ホルダー７０Ａが基体部材１０と直接組み付けられ、円筒部７２Ａと円形孔１４（すなわち弁口１５）とが同軸に配置される。そして、円形孔１４が円筒部７２Ａの上下方向（対向方向）と直交する方向への移動を規制する。また、円筒部７２Ａの段部７２ｅが基体部材１０に当接されている。そのため、複数の流量制御弁２を組み立てた際に、円筒部７２Ａにおける基体部材１０の円形孔１４への圧入量を均一にすることができる。
The cylindrical portion 72A has a press-fitting end portion 72c, which is a tip portion, and a main body portion 72d. The press-fitting end portion 72c and the main body portion 72d are vertically connected. The main body portion 72d is formed to have a larger diameter than the press-fitting end portion 72c. A step portion 72e is formed between the press-fitting end portion 72c and the main body portion 72d. The press-fitting end portion 72c is press-fitted into the circular hole 14 until the step portion 72e comes into contact with the base member 10. As a result, the holder 70A is directly assembled to the base member 10, and the cylindrical portion 72A and the circular hole 14 (that is, the valve port 15) are coaxially arranged. Then, the circular hole 14 restricts the movement of the cylindrical portion 72A in the direction orthogonal to the vertical direction (opposing direction). Further, the step portion 72e of the cylindrical portion 72A is in contact with the base member 10. Therefore, when the plurality of flow rate control valves 2 are assembled, the amount of press-fitting of the base member 10 into the circular hole 14 in the cylindrical portion 72A can be made uniform.
また、ホルダー本体７１Ａは、外筒部材２０の上端２０ｂの内側に嵌合されている。そして、ホルダー本体７１Ａの外径が外筒部材２０の内径と同一であることから、ホルダー本体７１Ａの外周面が、外筒部材２０の内周面に接するように形成されている。これにより、円筒部７２Ａの圧入端部７２ｃを基体部材１０の円形孔１４に圧入する際に、ホルダー本体７１Ａの外周面が外筒部材２０の内周面に接して、上下方向（圧入方向）への移動を案内する。そのため、円筒部７２Ａの圧入端部７２ｃが円形孔１４に傾いて圧入されてしまうことを抑制できる。
The holder body 71A is fitted inside the upper end 20b of the outer tubular member 20. Since the outer diameter of the holder main body 71A is the same as the inner diameter of the outer tubular member 20, the outer peripheral surface of the holder main body 71A is formed so as to contact the inner peripheral surface of the outer tubular member 20. Thus, when the press-fitting end portion 72c of the cylindrical portion 72A is press-fitted into the circular hole 14 of the base member 10, the outer peripheral surface of the holder body 71A contacts the inner peripheral surface of the outer tubular member 20, and the vertical direction (press-fitting direction) To guide you to. Therefore, it is possible to prevent the press-fitting end portion 72c of the cylindrical portion 72A from being inclined and press-fitted into the circular hole 14.
本実施例では、円筒部７２Ａが、圧入端部７２ｃと本体部７２ｄとの間に段部７２ｅが設けられた構成であった。この構成以外にも、次のような構成を採用してもよい。すなわち、円筒部７２Ａが、先端部である圧入端部７２ｃと、圧入端部７２ｃに連なる本体部７２ｄと、を有している。本体部７２ｄにおける圧入端部７２ｃ側の端部に、圧入端部７２ｃより径方向外方に突出する突出部が設けられている。突出部は、例えば、１つまたは周方向に間隔をあけて複数設けられている。そして、突出部が、基体部材１０に当接されている。この構成においても、突出部が基体部材１０に当接するまで圧入端部７２ｃを円形孔１４に圧入することで、複数の流量制御弁を組み立てた際に、円筒部７２Ａにおける基体部材１０の円形孔１４への圧入量を均一にすることができる。
In the present embodiment, the cylindrical portion 72A has a configuration in which the step portion 72e is provided between the press-fitting end portion 72c and the main body portion 72d. In addition to this configuration, the following configuration may be adopted. That is, the cylindrical portion 72A has a press-fitting end portion 72c that is a tip end portion and a main body portion 72d that is continuous with the press-fitting end portion 72c. A projecting portion that projects radially outward from the press-fitting end portion 72c is provided at an end portion of the main body portion 72d on the press-fitting end portion 72c side. For example, one protrusion or a plurality of protrusions are provided at intervals in the circumferential direction. The protruding portion is in contact with the base member 10. Also in this configuration, the press-fitting end portion 72c is press-fitted into the circular hole 14 until the protrusion contacts the base member 10, so that when the plurality of flow rate control valves are assembled, the circular hole of the base member 10 in the cylindrical portion 72A. The amount of press-fitting into 14 can be made uniform.
（第３実施例）
以下、本発明の第３実施例に係る流量制御弁について、図７を参照して説明する。 (Third embodiment)
Hereinafter, a flow rate control valve according to the third embodiment of the present invention will be described with reference to FIG.
以下、本発明の第３実施例に係る流量制御弁について、図７を参照して説明する。 (Third embodiment)
Hereinafter, a flow rate control valve according to the third embodiment of the present invention will be described with reference to FIG.
図７は、本発明の第３実施例に係る流量制御弁の弁体およびその近傍の拡大断面図である。図７に示す第３実施例に係る流量制御弁３において、上記流量制御弁１と同一の構成については同一の符号を付して説明を省略する。
FIG. 7 is an enlarged cross-sectional view of the valve body of the flow control valve according to the third embodiment of the present invention and the vicinity thereof. In the flow rate control valve 3 according to the third embodiment shown in FIG. 7, the same components as those of the flow rate control valve 1 are designated by the same reference numerals and the description thereof will be omitted.
流量制御弁３は、流量制御弁１のホルダー７０と構成の異なるホルダー７０Ｂを有する。
The flow control valve 3 has a holder 70B having a different structure from the holder 70 of the flow control valve 1.
ホルダー７０Ｂは、例えば、ステンレス材で構成されている。ホルダー７０Ｂは、略円板状のホルダー本体７１Ｂと、位置決め用の突部としての円筒部７２Ｂと、を一体的に有している。円筒部７２Ｂは、ホルダー本体７１Ｂの下面７１ａから下方に向けて突出している。
The holder 70B is made of, for example, a stainless material. The holder 70B integrally has a substantially disk-shaped holder body 71B and a cylindrical portion 72B as a positioning projection. The cylindrical portion 72B projects downward from the lower surface 71a of the holder body 71B.
ホルダー本体７１Ｂは、嵌合部７１ｅと、当接部７１ｆと、を有している。嵌合部７１ｅは、円柱状に形成されており、外径が外筒部材２０の内径と同一である。嵌合部７１ｅは、外筒部材２０の上端２０ｂの内側に嵌合されている。当接部７１ｆは、嵌合部７１ｅの外周面の上端に径方向外方に突出するように設けられた環状の突部である。当接部７１ｆは、外径がキャン４０の内径と同一に形成されている。当接部７１ｆは、外筒部材２０の上端２０ｂの端面２０ｃに当接されている。外筒部材２０の上端２０ｂはホルダー本体７１Ｂにより塞がれている。ホルダー７０Ｂとガイドブッシュ６１とは、支持部材６９Ｂを構成する。支持部材６９Ｂは、キャン４０および外筒部材２０の内側に配置されている。キャン４０の下端４０ａは、外筒部材２０の上端２０ｂに溶接されている。
The holder body 71B has a fitting portion 71e and a contact portion 71f. The fitting portion 71e is formed in a cylindrical shape and has an outer diameter equal to the inner diameter of the outer tubular member 20. The fitting portion 71e is fitted inside the upper end 20b of the outer tubular member 20. The contact portion 71f is an annular protrusion provided on the upper end of the outer peripheral surface of the fitting portion 71e so as to project radially outward. The outer diameter of the contact portion 71f is the same as the inner diameter of the can 40. The contact portion 71f is in contact with the end surface 20c of the upper end 20b of the outer tubular member 20. The upper end 20b of the outer cylinder member 20 is closed by the holder body 71B. The holder 70B and the guide bush 61 form a support member 69B. The support member 69B is arranged inside the can 40 and the outer cylinder member 20. The lower end 40a of the can 40 is welded to the upper end 20b of the outer tubular member 20.
円筒部７２Ｂは、基体部材１０の円形孔１４に圧入されている。そして、ホルダー本体７１Ｂの当接部７１ｆが外筒部材２０の上端２０ｂの端面２０ｃに当接されている。そのため、複数の流量制御弁３を組み立てた際に、円筒部７２Ｂにおける基体部材１０の円形孔１４への圧入量を均一にすることができる。
The cylindrical portion 72B is press-fitted into the circular hole 14 of the base member 10. The contact portion 71f of the holder body 71B is in contact with the end surface 20c of the upper end 20b of the outer tubular member 20. Therefore, when the plurality of flow rate control valves 3 are assembled, the amount of press-fitting of the base member 10 into the circular hole 14 in the cylindrical portion 72B can be made uniform.
また、ホルダー本体７１Ｂの嵌合部７１ｅは、外筒部材２０の上端２０ｂの内側に嵌合されている。そして、嵌合部７１ｅの外径が外筒部材２０の内径と同一であることから、嵌合部７１ｅの外周面が、外筒部材２０の内周面に接するように形成されている。これにより、円筒部７２Ｂを基体部材１０の円形孔１４に圧入する際に、嵌合部７１ｅの外周面が外筒部材２０の内周面に接して、上下方向（圧入方向）への移動を案内する。そのため、円筒部７２Ｂが円形孔１４に傾いて圧入されてしまうことを抑制できる。
The fitting portion 71e of the holder body 71B is fitted inside the upper end 20b of the outer tubular member 20. Since the outer diameter of the fitting portion 71e is the same as the inner diameter of the outer tubular member 20, the outer peripheral surface of the fitting portion 71e is formed so as to contact the inner circumferential surface of the outer tubular member 20. With this, when the cylindrical portion 72B is press-fitted into the circular hole 14 of the base member 10, the outer peripheral surface of the fitting portion 71e contacts the inner peripheral surface of the outer tubular member 20 to move in the vertical direction (press-fitting direction). invite. Therefore, it is possible to prevent the cylindrical portion 72B from being inclined and press-fitted into the circular hole 14.
上記に本発明の実施例を説明したが、本発明はこれらの例に限定されるものではない。前述の実施例に対して、当業者が適宜、構成要素の追加、削除、設計変更を行ったものや、実施例の特徴を適宜組み合わせたものも、本発明の趣旨に反しない限り、本発明の範囲に含まれる。
The examples of the present invention have been described above, but the present invention is not limited to these examples. Those skilled in the art may appropriately add or delete components, change the design, or appropriately combine the features of the embodiments with respect to the embodiments described above, as long as they do not violate the spirit of the invention. It is included in the range of.
（第１実施例）
１、１Ａ…流量制御弁、５…弁本体、６…弁体、８…弁体駆動部、１０…基体部材、１１…基体本体、１２…底壁、１３…弁室、１４…円形孔、１５…弁口、１６…流路、１７…均圧孔、１８…弁座、２０…外筒部材、２０ａ…下端、２０ｂ…上端、２３…背圧室、２６…第１導管、２７…第２導管、３１…胴部、３１ａ…上端面、３１ｂ…取付穴、３１ｃ…横孔、３２…先端部、３３…環状突出部、４０…キャン、４０ａ…下端、４１…内側空間、５０…モーター部、５１…ローター、５２…ステーター、５３…ヨーク、５４…ボビン、５５…ステーターコイル、５６…樹脂モールドカバー、６０…駆動機構部、６１…ガイドブッシュ、６１ａ…小径部、６１ｂ…大径部、６１ｃ…雄ねじ、６１ｄ…横孔、６２…弁軸ホルダー、６２ａ…周壁部、６２ｂ…上壁部、６２ｃ…雌ねじ、６３…ストッパ機構、６３ａ…下ストッパ体、６３ｂ…上ストッパ体、６４…駆動軸、６４ａ…上端部、６４ｂ…胴部、６４ｃ…先端部、６４ｄ…プッシュナット、６４ｅ…先端突起、６４ｆ…フランジ部、６５…封止部材、６５ａ…Ｏリング、６５ｂ…パッキン、６６…支持リング、６７…復帰ばね、６８…圧縮コイルばね、６９…支持部材、７０…ホルダー、７１…ホルダー本体、７１ａ…下面、７１ｂ…圧入穴、７１ｃ…軸孔、７１ｄ…縦孔、７２…円筒部、７２ａ…横孔、
（第２実施例）
２…流量制御弁、６９Ａ…支持部材、７０Ａ…ホルダー、７１Ａ…ホルダー本体、７２Ａ…円筒部、７２ｃ…圧入端部、７２ｄ…本体部、７２ｅ…段部、
（第３実施例）
３…流量制御弁、６９Ｂ…支持部材、７０Ｂ…ホルダー、７１Ｂ…ホルダー本体、７２Ｂ…円筒部、７１ｅ…嵌合部、７１ｆ…当接部 (First embodiment)
1, 1A... Flow rate control valve, 5... Valve body, 6... Valve body, 8... Valve body drive part, 10... Base member, 11... Base body, 12... Bottom wall, 13... Valve chamber, 14... Circular hole, 15... Valve port, 16... Flow path, 17... Pressure equalizing hole, 18... Valve seat, 20... Outer cylinder member, 20a... Lower end, 20b... Upper end, 23... Back pressure chamber, 26... First conduit, 27... 2 conduits, 31... trunk, 31a... upper end surface, 31b... mounting hole, 31c... lateral hole, 32... tip part, 33... annular protrusion, 40... can, 40a... lower end, 41... inner space, 50... motor Parts, 51... Rotor, 52... Stator, 53... Yoke, 54... Bobbin, 55... Stator coil, 56... Resin mold cover, 60... Drive mechanism section, 61... Guide bush, 61a... Small diameter section, 61b... Large diameter section , 61c... Male screw, 61d... Transverse hole, 62... Valve shaft holder, 62a... Peripheral wall portion, 62b... Upper wall portion, 62c... Female thread, 63... Stopper mechanism, 63a... Lower stopper body, 63b... Upper stopper body, 64... Drive shaft, 64a... Upper end portion, 64b... Body portion, 64c... Tip portion, 64d... Push nut, 64e... Tip protrusion, 64f... Flange portion, 65... Sealing member, 65a... O ring, 65b... Packing, 66... Support ring, 67... Return spring, 68... Compression coil spring, 69... Support member, 70... Holder, 71... Holder body, 71a... Bottom surface, 71b... Press-fit hole, 71c... Shaft hole, 71d... Vertical hole, 72... Cylinder Part, 72a... lateral hole,
(Second embodiment)
2... Flow control valve, 69A... Support member, 70A... Holder, 71A... Holder body, 72A... Cylindrical part, 72c... Press-fitting end part, 72d... Main body part, 72e... Step part,
(Third embodiment)
3... Flow control valve, 69B... Support member, 70B... Holder, 71B... Holder body, 72B... Cylindrical part, 71e... Fitting part, 71f... Abutting part
１、１Ａ…流量制御弁、５…弁本体、６…弁体、８…弁体駆動部、１０…基体部材、１１…基体本体、１２…底壁、１３…弁室、１４…円形孔、１５…弁口、１６…流路、１７…均圧孔、１８…弁座、２０…外筒部材、２０ａ…下端、２０ｂ…上端、２３…背圧室、２６…第１導管、２７…第２導管、３１…胴部、３１ａ…上端面、３１ｂ…取付穴、３１ｃ…横孔、３２…先端部、３３…環状突出部、４０…キャン、４０ａ…下端、４１…内側空間、５０…モーター部、５１…ローター、５２…ステーター、５３…ヨーク、５４…ボビン、５５…ステーターコイル、５６…樹脂モールドカバー、６０…駆動機構部、６１…ガイドブッシュ、６１ａ…小径部、６１ｂ…大径部、６１ｃ…雄ねじ、６１ｄ…横孔、６２…弁軸ホルダー、６２ａ…周壁部、６２ｂ…上壁部、６２ｃ…雌ねじ、６３…ストッパ機構、６３ａ…下ストッパ体、６３ｂ…上ストッパ体、６４…駆動軸、６４ａ…上端部、６４ｂ…胴部、６４ｃ…先端部、６４ｄ…プッシュナット、６４ｅ…先端突起、６４ｆ…フランジ部、６５…封止部材、６５ａ…Ｏリング、６５ｂ…パッキン、６６…支持リング、６７…復帰ばね、６８…圧縮コイルばね、６９…支持部材、７０…ホルダー、７１…ホルダー本体、７１ａ…下面、７１ｂ…圧入穴、７１ｃ…軸孔、７１ｄ…縦孔、７２…円筒部、７２ａ…横孔、
（第２実施例）
２…流量制御弁、６９Ａ…支持部材、７０Ａ…ホルダー、７１Ａ…ホルダー本体、７２Ａ…円筒部、７２ｃ…圧入端部、７２ｄ…本体部、７２ｅ…段部、
（第３実施例）
３…流量制御弁、６９Ｂ…支持部材、７０Ｂ…ホルダー、７１Ｂ…ホルダー本体、７２Ｂ…円筒部、７１ｅ…嵌合部、７１ｆ…当接部 (First embodiment)
1, 1A... Flow rate control valve, 5... Valve body, 6... Valve body, 8... Valve body drive part, 10... Base member, 11... Base body, 12... Bottom wall, 13... Valve chamber, 14... Circular hole, 15... Valve port, 16... Flow path, 17... Pressure equalizing hole, 18... Valve seat, 20... Outer cylinder member, 20a... Lower end, 20b... Upper end, 23... Back pressure chamber, 26... First conduit, 27... 2 conduits, 31... trunk, 31a... upper end surface, 31b... mounting hole, 31c... lateral hole, 32... tip part, 33... annular protrusion, 40... can, 40a... lower end, 41... inner space, 50... motor Parts, 51... Rotor, 52... Stator, 53... Yoke, 54... Bobbin, 55... Stator coil, 56... Resin mold cover, 60... Drive mechanism section, 61... Guide bush, 61a... Small diameter section, 61b... Large diameter section , 61c... Male screw, 61d... Transverse hole, 62... Valve shaft holder, 62a... Peripheral wall portion, 62b... Upper wall portion, 62c... Female thread, 63... Stopper mechanism, 63a... Lower stopper body, 63b... Upper stopper body, 64... Drive shaft, 64a... Upper end portion, 64b... Body portion, 64c... Tip portion, 64d... Push nut, 64e... Tip protrusion, 64f... Flange portion, 65... Sealing member, 65a... O ring, 65b... Packing, 66... Support ring, 67... Return spring, 68... Compression coil spring, 69... Support member, 70... Holder, 71... Holder body, 71a... Bottom surface, 71b... Press-fit hole, 71c... Shaft hole, 71d... Vertical hole, 72... Cylinder Part, 72a... lateral hole,
(Second embodiment)
2... Flow control valve, 69A... Support member, 70A... Holder, 71A... Holder body, 72A... Cylindrical part, 72c... Press-fitting end part, 72d... Main body part, 72e... Step part,
(Third embodiment)
3... Flow control valve, 69B... Support member, 70B... Holder, 71B... Holder body, 72B... Cylindrical part, 71e... Fitting part, 71f... Abutting part
Claims (12)
- 弁室および前記弁室に開口する弁口が設けられた基体部材と、
前記基体部材の外側に配置された外筒部材と、
前記弁口に対向して配置され、前記弁口を開閉する弁体と、
前記弁体が先端部に設けられた駆動軸と、
前記駆動軸を前記弁口と前記弁体との対向方向に移動可能に支持する支持部材と、を有し、
前記外筒部材の一端が前記基体部材により塞がれ、かつ、前記外筒部材の他端が前記支持部材により塞がれており、前記弁室と区画された背圧室が形成され、
前記弁体または前記駆動軸が前記弁室と前記背圧室とをまたいで配置され、
前記基体部材は、前記弁口に連なる流路および当該流路と前記背圧室とを接続する均圧孔が設けられていることを特徴とする流量制御弁。 A base member provided with a valve chamber and a valve opening that opens into the valve chamber;
An outer cylinder member arranged outside the base member,
A valve body that is arranged to face the valve opening and that opens and closes the valve opening;
A drive shaft provided with the valve body at the tip,
A support member that movably supports the drive shaft in a direction in which the valve opening and the valve body face each other,
One end of the outer cylinder member is closed by the base member, and the other end of the outer cylinder member is closed by the support member, forming a back pressure chamber partitioned from the valve chamber,
The valve body or the drive shaft is arranged across the valve chamber and the back pressure chamber,
The flow rate control valve, wherein the base member is provided with a flow passage communicating with the valve port and a pressure equalizing hole connecting the flow passage and the back pressure chamber. - 前記弁体または前記駆動軸が貫通する環状に形成され、前記弁室と前記背圧室との間を封止する封止部材を有し、
前記封止部材が封止する封止箇所の径が、前記弁口の径と同一である、請求項１に記載の流量制御弁。 The valve body or the drive shaft is formed in an annular shape that penetrates, and has a sealing member that seals between the valve chamber and the back pressure chamber,
The flow control valve according to claim 1, wherein a diameter of a sealing portion sealed by the sealing member is the same as a diameter of the valve port. - 前記基体部材および前記支持部材のうちの一方に突部が設けられ、かつ、他方に前記突部が挿入されて当該突部の前記対向方向と直交する方向への移動を規制する孔が設けられている、請求項１または請求項２に記載の流量制御弁。 One of the base member and the support member is provided with a protrusion, and the other is provided with a hole for regulating the movement of the protrusion in a direction orthogonal to the facing direction. The flow control valve according to claim 1, wherein the flow control valve according to claim 1.
- 前記基体部材に、前記孔としての前記弁口と同軸に配置された円形孔が設けられ、
前記支持部材に、前記突部としての前記駆動軸と同軸に配置された円筒部が設けられている、請求項３に記載の流量制御弁。 The base member is provided with a circular hole arranged coaxially with the valve port as the hole,
The flow control valve according to claim 3, wherein the support member is provided with a cylindrical portion arranged coaxially with the drive shaft as the protrusion. - 前記円筒部が前記円形孔に圧入されている、請求項４に記載の流量制御弁。 The flow control valve according to claim 4, wherein the cylindrical portion is press-fitted into the circular hole.
- 前記円筒部が、前記円形孔に圧入される圧入端部と、前記圧入端部に連なり、当該圧入端部より大径の本体部と、を有し、
前記圧入端部と前記本体部との間の段部が、前記基体部材に当接されている、請求項５に記載の流量制御弁。 The cylindrical portion has a press-fitting end portion that is press-fitted into the circular hole, and a main body portion that is continuous with the press-fitting end portion and has a larger diameter than the press-fitting end portion.
The flow control valve according to claim 5, wherein a step portion between the press-fitting end portion and the main body portion is in contact with the base member. - 前記円筒部が、前記円形孔に圧入される圧入端部と、前記圧入端部に連なる本体部と、を有し、
前記本体部における前記圧入端部側の端部に、前記圧入端部より径方向外方に突出する突出部が設けられ、
前記突出部が、前記基体部材に当接されている、請求項５に記載の流量制御弁。 The cylindrical portion has a press-fitting end portion that is press-fitted into the circular hole, and a main body portion that is continuous with the press-fitting end portion,
At the end portion of the main body portion on the side of the press-fitting end portion, a projecting portion that projects radially outward from the press-fitting end portion is provided,
The flow control valve according to claim 5, wherein the protrusion is in contact with the base member. - 前記支持部材が、前記外筒部材の内側に嵌合される嵌合部を有し、
前記嵌合部の外周面が、前記外筒部材の内周面に接するように形成されている、請求項５～請求項７のいずれか一項に記載の流量制御弁。 The support member has a fitting portion fitted inside the outer tubular member,
8. The flow control valve according to claim 5, wherein an outer peripheral surface of the fitting portion is formed so as to contact an inner peripheral surface of the outer tubular member. - 前記支持部材が、前記外筒部材の他端における端面に当接される当接部を有している、請求項５に記載の流量制御弁。 The flow control valve according to claim 5, wherein the support member has an abutting portion that abuts on an end face at the other end of the outer tubular member.
- 前記駆動軸を含む弁体駆動部をさらに有し、
前記支持部材が、前記弁体駆動部のケースおよび前記外筒部材の内側に配置され、
前記ケースと前記外筒部材とが溶接されている、請求項５～請求項９のいずれか一項に記載の流量制御弁。 Further comprising a valve body drive unit including the drive shaft,
The support member is arranged inside the case of the valve body drive unit and the outer cylinder member,
The flow control valve according to any one of claims 5 to 9, wherein the case and the outer cylinder member are welded to each other. - 前記外筒部材の他端における端面が前記支持部材に当接した状態で当該外筒部材と当該支持部材とが固定されている、請求項５に記載の流量制御弁。 The flow control valve according to claim 5, wherein the outer cylinder member and the support member are fixed in a state where an end surface at the other end of the outer cylinder member is in contact with the support member.
- 弁室および前記弁室に開口する弁口が設けられた基体部材と、前記基体部材の外側に配置された外筒部材と、前記弁口に対向して配置され、前記弁口を開閉する弁体と、前記弁体が先端部に設けられた駆動軸と、前記駆動軸を前記弁口と前記弁体との対向方向に移動可能に支持する支持部材と、を有し、前記基体部材は、前記弁口に連なる流路および当該流路と前記基体部材の外側とを接続する均圧孔が設けられている流量制御弁の組立方法であって、
前記外筒部材の一端を前記基体部材で塞ぎ、
前記基体部材に設けられた前記弁口と同軸に配置された円形孔に、前記支持部材に設けられた前記駆動軸と同軸に配置された円筒部を圧入し、
前記外筒部材の他端が前記支持部材に突き当たるまで前記円筒部の圧入を進めて前記外筒部材の他端を前記支持部材で塞ぐことにより、前記基体部材の外側に前記弁室と区画された背圧室を形成するとともに、前記弁体または前記駆動軸を前記弁室と前記背圧室とをまたいで配置することを特徴とする流量制御弁の組立方法。 A base member provided with a valve chamber and a valve opening that opens to the valve chamber, an outer cylinder member arranged outside the base member, and a valve that is arranged so as to face the valve opening and opens and closes the valve opening. A body, a drive shaft provided with the valve body at a tip portion thereof, and a support member for movably supporting the drive shaft in a direction in which the valve opening and the valve body face each other, and the base member includes A method of assembling a flow rate control valve, wherein a flow path connected to the valve port and a pressure equalizing hole connecting the flow path and the outside of the base member are provided,
Closing one end of the outer cylinder member with the base member,
In a circular hole coaxially arranged with the valve port provided in the base member, a cylindrical portion coaxially arranged with the drive shaft provided in the support member is press-fitted,
By further press-fitting the cylindrical portion until the other end of the outer tubular member abuts the support member and close the other end of the outer tubular member with the support member, the valve chamber is partitioned outside the base member. A back pressure chamber is formed, and the valve body or the drive shaft is arranged so as to straddle the valve chamber and the back pressure chamber.
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