JP2016118222A

JP2016118222A - Electric valve

Info

Publication number: JP2016118222A
Application number: JP2014257015A
Authority: JP
Inventors: 貴昭市川; Takaaki Ichikawa; 治高見; Osamu Takami
Original assignee: Pacific Industrial Co Ltd
Current assignee: Pacific Industrial Co Ltd
Priority date: 2014-12-19
Filing date: 2014-12-19
Publication date: 2016-06-30
Anticipated expiration: 2034-12-19
Also published as: JP6322562B2

Abstract

PROBLEM TO BE SOLVED: To provide an electric valve capable of downsizing a drive source.SOLUTION: In an electric valve 10, a pilot valve body 42 is driven to open/close a pilot valve port 33A to change the inner pressure of a back surface room 18 on a back surface side of a main valve body 20, thereby opening/closing a main valve port 13 having a larger caliber than the pilot valve port 33A. The electric valve 10 is equipped with the pilot valve port 33A on a base member 11S, so that as compared with a conventional one equipped with the pilot valve port 33A on the main valve body 20, a direct-acting stroke required for a pilot valve body 42 becomes short. Therefore, a drive source unit 40 can be downsized, and a cost and the fuel consumption of the drive source unit 40 can be saved.SELECTED DRAWING: Figure 1

Description

本発明は、メイン弁体を直動させるためのパイロット弁体を有する電動弁に関する。 The present invention relates to a motor-operated valve having a pilot valve body for moving a main valve body directly.

従来、この種の電動弁として、メイン弁体に背面側から対向する背面部屋を備えると共に、メイン弁体を貫通する圧力解放流路の一端開口をパイロット弁口としてメイン弁体の背面に配置し、そのパイロット弁口をパイロット弁体にて開閉してメイン弁体を直動させるものが知られている（例えば、特許文献１参照）。 Conventionally, as this type of electric valve, a back chamber facing the main valve body from the back side is provided, and one end opening of a pressure release passage penetrating the main valve body is disposed on the back surface of the main valve body as a pilot valve port. A system is known in which the pilot valve port is opened and closed by a pilot valve body to directly move the main valve body (see, for example, Patent Document 1).

特開２０１２−１５４３６０号公報（段落［００２５］，［００２６］及び図１）JP 2012-154360 A (paragraphs [0025], [0026] and FIG. 1)

しかしながら、従来の電動弁の構造では、パイロット弁口がメイン弁体と共に移動するので、そのパイロット弁口を開閉するパイロット弁体に必要な直動ストロークが長くなり、それに伴い駆動源が大きくなるという問題があった。 However, in the conventional motor-operated valve structure, the pilot valve port moves together with the main valve body. Therefore, the linear motion stroke required for the pilot valve body that opens and closes the pilot valve port becomes longer, and the drive source increases accordingly. There was a problem.

本発明は、上記事情に鑑みてなされたもので、駆動源を従来より小さくすることが可能な電動弁の提供を目的とする。 The present invention has been made in view of the above circumstances, and an object thereof is to provide a motor-operated valve capable of making the drive source smaller than the conventional one.

上記目的を達成するためになされた請求項１の発明は、屈曲した流路（１６）と、前記流路（１６）の屈曲部（１６Ａ）の下流側に配置されたメイン弁口（１３）と、前記流路（１６）の屈曲部（１６Ａ）を挟んで前記メイン弁口（１３）に対向した支持凹部（１７）とをベース部材（１１Ｓ）に設けると共に、前記支持凹部（１７）にメイン弁体（２０）を直動可能に嵌合して、前記メイン弁体（２０）の裏側に背面部屋（１８）を形成し、前記メイン弁口（１３）より上流側の前記屈曲部（１６Ａ）の内圧を前記背面部屋（１８）に取り込むためのオリフィス（２０Ｓ，５０）と、前記背面部屋（１８）の内圧を前記メイン弁口（１３）より下流側の前記流路（１６）に逃がすための圧力解放流路（２４Ｒ）と、前記圧力解放流路（２４Ｒ）を開閉するパイロット弁体（４２）と、前記パイロット弁体（４２）を駆動する駆動源（４０，４０Ｖ，４０Ｗ）と、前記メイン弁体（２０）を閉弁側に付勢する弾性部材（２６）とを備え、前記圧力解放流路（２４Ｒ）を閉じると、前記背面部屋（１８）の内圧と前記弾性部材（２６）の弾発力とにより前記メイン弁体（２０）を閉弁側に押す閉弁力が、前記メイン弁口（１３）より上流側の前記流路（１６）の内圧により前記メイン弁体（２０）を開弁側に押す開弁力に勝って前記メイン弁口（１３）が閉じられる一方、前記圧力解放流路（２４Ｒ）を開くと、前記開弁力が前記閉弁力に勝って前記メイン弁口（１３）が開かれる電動弁（１０，１０Ｖ，１０Ｗ）において、前記圧力解放流路（２４Ｒ）の少なくとも一部を前記ベース部材（１１Ｓ）に形成し、そのベース部材（１１Ｓ）に形成された前記圧力解放流路（２４Ｒ）の一部に前記パイロット弁体（４２）により開閉されるパイロット弁口（３３Ａ）を備えた電動弁（１０，１０Ｖ，１０Ｗ）である。 In order to achieve the above object, the invention of claim 1 includes a bent flow path (16) and a main valve port (13) disposed on the downstream side of the bent portion (16A) of the flow path (16). And a support recess (17) facing the main valve port (13) across the bent portion (16A) of the flow path (16) are provided in the base member (11S), and the support recess (17) The main valve body (20) is fitted so as to be linearly movable to form a back chamber (18) on the back side of the main valve body (20), and the bent portion (upstream side from the main valve port (13)) ( 16A) an orifice (20S, 50) for taking the internal pressure into the back chamber (18), and the internal pressure of the back chamber (18) into the flow path (16) downstream from the main valve port (13). A pressure release channel (24R) for relief, and the pressure release channel (24 ), A drive source (40, 40V, 40W) for driving the pilot valve body (42), and an elastic member for biasing the main valve body (20) toward the valve closing side. (26), and closing the pressure release channel (24R) closes the main valve body (20) by the internal pressure of the back chamber (18) and the elastic force of the elastic member (26). The valve closing force that pushes the valve to the side overcomes the valve opening force that pushes the main valve element (20) to the valve opening side by the internal pressure of the flow path (16) upstream from the main valve port (13). When the pressure release channel (24R) is opened while the port (13) is closed, the motor-operated valve (10, 10V, 10W), at least a part of the pressure release channel (24R) A pilot valve port (33A) that is formed on the member (11S) and that is opened and closed by the pilot valve body (42) is provided in a part of the pressure release channel (24R) formed on the base member (11S). It is a motorized valve (10, 10V, 10W).

請求項２の発明は、前記メイン弁体（２０）を直動方向に貫通する弁体貫通孔（２４）と、前記ベース部材（１１Ｓ）のうち前記背面部屋（１８）に対して前記メイン弁体（２０）とは反対側に区画壁（３０）を挟んで形成され、前記パイロット弁体（４２）が収容されたパイロット部屋（３６，３６Ｖ）と前記区画壁（３０）から突出し、先端部が前記弁体貫通孔（２４）内に常時嵌合されている固定筒（３１）と、前記区画壁（３０）と前記固定筒（３１）とを貫通する筒貫通孔（３３）と、前記区画壁（３０）に形成され、前記筒貫通孔（３３）の側方で前記背面部屋（１８）と前記パイロット部屋（３６，３６Ｖ）との間を連通する連通路（３０Ｂ）とが備えられ、前記筒貫通孔（３３）における前記パイロット部屋（３６，３６Ｖ）側の開口が前記パイロット弁口（３３Ａ）をなし、前記筒貫通孔（３３）と前記弁体貫通孔（２４）と前記パイロット部屋（３６，３６Ｖ）と前記連通路（３０Ｂ）とによって前記圧力解放流路（２４Ｒ）が構成されている請求項１に記載の電動弁（１０，１０Ｖ，１０Ｗ）である。 According to a second aspect of the present invention, there is provided a valve body through hole (24) penetrating the main valve body (20) in a linear motion direction, and the main valve with respect to the back chamber (18) of the base member (11S). It is formed on both sides of the partition wall (30) on the opposite side of the body (20), protrudes from the pilot chamber (36, 36V) in which the pilot valve body (42) is accommodated and the partition wall (30), and has a tip portion A fixed cylinder (31) that is always fitted in the valve body through hole (24), a cylinder through hole (33) that passes through the partition wall (30) and the fixed cylinder (31), and A communication passage (30B) is provided in the partition wall (30) and communicates between the back room (18) and the pilot room (36, 36V) on the side of the cylindrical through hole (33). The pilot chamber (36, 36V) in the cylindrical through hole (33) The side opening forms the pilot valve port (33A), and the cylinder through hole (33), the valve body through hole (24), the pilot chamber (36, 36V), and the communication path (30B) The motor-operated valve (10, 10V, 10W) according to claim 1, wherein the release flow path (24R) is configured.

請求項３の発明は、前記弁体貫通孔（２４）から側方に延びて前記メイン弁体（２０）の側面に開口し、前記メイン弁口（１３）に比べて微少な流量の流体が前記メイン弁口（１３）の上流側の流路（１６）から前記弁体貫通孔（２４）へと流れることを許容する連通流路（２５）を備えた請求項２に記載の電動弁（１０）である。 The invention of claim 3 extends laterally from the valve body through-hole (24) and opens to the side surface of the main valve body (20), so that a fluid having a flow rate smaller than that of the main valve port (13) is obtained. The motor-operated valve according to claim 2, further comprising a communication flow path (25) that allows flow from the flow path (16) on the upstream side of the main valve port (13) to the valve body through hole (24). 10).

請求項４の発明は、前記パイロット弁体（４２）に形成され、前記オリフィス（５０）を通過する流体に比べて微少な流量の流体が前記パイロット部屋（３６Ｖ）から前記筒貫通孔（３３）とへと流れることを許容する連通流路（５５Ａ，５５Ｂ）を備えた請求項２に記載の電動弁（１０Ｖ）である。 According to a fourth aspect of the present invention, a small amount of fluid is formed from the pilot chamber (36V) and is formed in the pilot valve body (42) and passes through the orifice (50) from the pilot chamber (36V). It is a motor operated valve (10V) of Claim 2 provided with the communication flow path (55A, 55B) which permits flowing into.

請求項５の発明は、前記メイン弁体（２０Ｖ）には、前記弁体貫通孔（２４）を囲みかつ前記メイン弁口（１３）と反対側に開放した筒形凹部（１８Ｖ）が形成され、その筒形凹部（１８Ｖ）により前記背面部屋（１８）の一部が構成されると共に、その筒形凹部（１８Ｖ）内に前記弾性部材（２６）としての圧縮コイルバネ（２６）が収容され、前記オリフィス（５０）が前記メイン弁体（２０Ｖ）の外側面から前記筒形凹部（１８Ｖ）に貫通している請求項２乃至４の何れか１の請求項に記載の電動弁（１０Ｖ，１０Ｗ）である。 According to a fifth aspect of the present invention, the main valve body (20V) is formed with a cylindrical recess (18V) that surrounds the valve body through hole (24) and opens to the opposite side of the main valve port (13). The cylindrical recess (18V) constitutes a part of the back chamber (18), and a compression coil spring (26) as the elastic member (26) is accommodated in the cylindrical recess (18V). The motor operated valve (10V, 10W) according to any one of claims 2 to 4, wherein the orifice (50) penetrates the cylindrical recess (18V) from an outer surface of the main valve body (20V). ).

請求項６の発明は、前記パイロット弁体（４２）には、前記パイロット弁口（３３Ａ）に向かって先細りになったテーパー面（４２Ｔ）が形成され、前記パイロット弁体（４２）を位置制御可能な前記駆動源（４０Ｗ）としてのモータ（４０Ｗ）を備えた請求項２乃至５の何れか１の請求項に記載の電動弁（１０Ｗ）である。 In the invention of claim 6, the pilot valve body (42) is formed with a tapered surface (42T) tapered toward the pilot valve port (33A), and the position of the pilot valve body (42) is controlled. The motor-operated valve (10W) according to any one of claims 2 to 5, further comprising a motor (40W) as the possible drive source (40W).

請求項１の電動弁（１０，１０Ｖ，１０Ｗ）では、ベース部材（１１Ｓ）に形成された圧力解放流路（２４Ｒ）の一部にパイロット弁体（４２）により開閉されるパイロット弁口（３３Ａ）を備えたので、パイロット弁口（３３Ａ）がメイン弁体（２０）に備えられた従来のものに比べて、パイロット弁体（４２）に必要な直動ストロークが短くなり、駆動源（４０，４０Ｖ，４０Ｗ）を小さくすることができ、駆動源（４０，４０Ｖ，４０Ｗ）の低コスト化と消費電力の削減が図られる。ここで、圧力解放流路（２４Ｒ）は、全体がベース部材（１１Ｓ）に形成されていてもよいし、一部のみがベース部材（１１Ｓ）に形成され、残りがメイン弁体（２０）に形成されていてもよい。具体的には、請求項２の電動弁（１０，１０Ｖ，１０Ｗ）のように、メイン弁体（２０）に形成された弁体貫通孔（２４）と、その弁体貫通孔（２４）に嵌合するベース部材（１１Ｓ）の固定筒（３１）の内側の筒貫通孔（３３）等から圧力解放流路（２４Ｒ）が構成されていてもよい。そのようにすれば、メイン弁体（２０）の直動方向の延長上にパイロット弁口（３３Ａ）及びパイロット弁体（４２）を配置することでき、電動弁（１０，１０Ｖ，１０Ｗ）をスリムな構造にすることができる。 In the motor-operated valve (10, 10V, 10W) according to claim 1, a pilot valve port (33A) opened and closed by a pilot valve body (42) in a part of the pressure release passage (24R) formed in the base member (11S). ), The direct acting stroke required for the pilot valve body (42) is shorter than that of the conventional one in which the pilot valve port (33A) is provided in the main valve body (20), and the drive source (40 , 40V, 40W) can be reduced, and the drive source (40, 40V, 40W) can be reduced in cost and power consumption. Here, the pressure release channel (24R) may be entirely formed in the base member (11S), or only a part is formed in the base member (11S), and the rest is in the main valve body (20). It may be formed. Specifically, as in the motor-operated valve (10, 10V, 10W) of claim 2, the valve body through hole (24) formed in the main valve body (20) and the valve body through hole (24) The pressure release flow path (24R) may be configured by a cylinder through hole (33) inside the fixed cylinder (31) of the base member (11S) to be fitted. By doing so, the pilot valve port (33A) and the pilot valve body (42) can be disposed on the extension of the main valve body (20) in the linear movement direction, and the motor-operated valve (10, 10V, 10W) can be slimmed. Structure.

請求項３及び４の構成によれば、弁体貫通孔（２４）が圧力解放流路（２４Ｒ）の一部としてだけではなく、メイン弁口（１３）の閉弁時に微小な流量の流体をメイン弁口（１３）の上流側から下流側の流路（１６）に流すため流路としても使用され、二段流量特性（弁体貫通孔（２４）で小流量、メイン弁口（１３）で大流量）の有効利用が図られる。 According to the configuration of claims 3 and 4, the valve body through-hole (24) is not only a part of the pressure release channel (24R), but a small flow rate of fluid is supplied when the main valve port (13) is closed. It is also used as a flow path to flow from the upstream side to the downstream side flow path (16) of the main valve port (13), and has two-stage flow characteristics (small flow rate in the valve body through hole (24), main valve port (13) Can be used effectively.

請求項５の構成によれば、メイン弁体（２０Ｖ）のうち弁体貫通孔（２４）を囲むように形成された筒形凹部（１８Ｖ）が背面部屋（１８）の少なくとも一部を構成すると共に、メイン弁体（２０Ｖ）を閉弁側に付勢する圧縮コイルバネ（２６）の収容部を兼ねているので、メイン弁体（２０Ｖ）の直動方向で電動弁（１０Ｖ，１０Ｗ）がコンパクトになる。また、オリフィス（５０）がメイン弁体（２０Ｖ）の外側面から筒形凹部（１８Ｖ）に貫通しているので、オリフィス（５０）を通した背面部屋（１８）への圧力の取り込みを安定して行うことができる。 According to the structure of Claim 5, the cylindrical recessed part (18V) formed so that the valve body through-hole (24) may be enclosed among main valve bodies (20V) comprises at least one part of a back room (18). At the same time, it also serves as a housing for the compression coil spring (26) that biases the main valve body (20V) toward the valve closing side, so that the motorized valve (10V, 10W) is compact in the direction of direct movement of the main valve body (20V). become. Moreover, since the orifice (50) penetrates the cylindrical recess (18V) from the outer surface of the main valve body (20V), the pressure can be stably taken into the back chamber (18) through the orifice (50). Can be done.

請求項６の電動弁（１０Ｗ）によれば、モータ（４０Ｗ）にてパイロット弁体（４２）の位置を制御してパイロット弁口（３３Ａ）の開度を徐々に変更し、メイン弁口（１３）の閉弁時に圧力解放流路（２４Ｒ）を通してメイン弁口（１３）の上流側から下流側に流す流体の流量を制御することが可能になる。詳細には、オリフィス（５０）の内径以下の小流量範囲で任意の流量制御ができ、オリフィス（５０）の内径以上ではメイン弁体（２０Ｖ）がメイン弁口（１３）を開いて大流量を得ることが可能になり、有効利用が図られる。 According to the electric valve (10W) of the sixth aspect, the position of the pilot valve body (42) is controlled by the motor (40W) to gradually change the opening degree of the pilot valve port (33A). It is possible to control the flow rate of the fluid flowing from the upstream side to the downstream side of the main valve port (13) through the pressure release channel (24R) when the valve 13) is closed. Specifically, an arbitrary flow rate can be controlled within a small flow rate range equal to or smaller than the inner diameter of the orifice (50), and the main valve body (20V) opens the main valve port (13) to increase a large flow rate above the inner diameter of the orifice (50). It can be obtained and effective utilization is achieved.

本発明の第１実施形態に係る電動弁の開弁状態の側断面図The sectional side view of the valve-open state of the motor operated valve concerning a 1st embodiment of the present invention. パイロット弁口が閉じた瞬間の電動弁の側断面図Side sectional view of the motorized valve when the pilot valve port is closed パイロット弁口が閉じて、メイン弁口が閉じた状態の電動弁の側断面図Side sectional view of the motorized valve with the pilot valve closed and the main valve closed パイロット弁口が開いた瞬間の電動弁の側断面図Side sectional view of the motorized valve at the moment when the pilot valve port is opened 第２実施形態の電動弁の閉弁状態の側断面図Side sectional view of the closed state of the electric valve of the second embodiment 電動弁の開弁状態の側断面図Side sectional view of the open state of the motorized valve 第３実施形態の電動弁の側断面図Side sectional view of the motor operated valve of the third embodiment

［第１実施形態］
以下、本発明の第１実施形態を図１〜図４に基づいて説明する。図１に示すように、本実施形態の電動弁１０は、メイン弁体２０を収容したバルブボディ１１に駆動源ユニット４０を組み付けてなる。 [First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the motor-operated valve 10 of this embodiment is configured by assembling a drive source unit 40 to a valve body 11 that houses a main valve body 20.

バルブボディ１１は、例えば直方体状をなし、上面中央から下端寄り位置まで延びたセンター孔１２を備え、センター孔１２の下端寄り位置の内径が絞られて本発明に係るメイン弁口１３が形成されている。また、センター孔１２のうちメイン弁口１３の上側近傍位置には、バルブボディ１１の一側面から穿孔された第１横孔１４が連絡されると共に、センター孔１２の下端部には、バルブボディ１１の他の側面から穿孔された第２横孔１５が連絡されている。そして、これら第１と第２の横孔１４，１５とセンター孔１２の一部とからクランク状に屈曲した流路１６が形成されている。なお、本実施形態では、流路１６のうちクランク状となった２つの屈曲部のうち上側の屈曲部１６Ａが本発明に係る「流路の屈曲部」に相当する。 The valve body 11 has, for example, a rectangular parallelepiped shape and includes a center hole 12 extending from the center of the upper surface to a position near the lower end, and the inner diameter of the position near the lower end of the center hole 12 is reduced to form the main valve port 13 according to the present invention. ing. In addition, a first horizontal hole 14 drilled from one side surface of the valve body 11 is communicated with a position near the upper side of the main valve port 13 in the center hole 12, and a valve body is connected to a lower end portion of the center hole 12. The 2nd horizontal hole 15 drilled from the other side surface of 11 is connected. A flow path 16 bent in a crank shape is formed from the first and second lateral holes 14 and 15 and a part of the center hole 12. In the present embodiment, the upper bent portion 16A of the two bent portions having a crank shape in the flow channel 16 corresponds to the “bent portion of the flow channel” according to the present invention.

センター孔１２の上端部には、駆動源ユニット４０の一構成部品である駆動源ベース３０が嵌合固定されている。そして、バルブボディ１１と駆動源ベース３０と後述する駆動源ユニット４０の筒形ケース３５とから、本発明に係るベース部材１１Ｓが構成されている。 A drive source base 30 that is a component of the drive source unit 40 is fitted and fixed to the upper end portion of the center hole 12. A base member 11S according to the present invention is constituted by the valve body 11, the drive source base 30, and a cylindrical case 35 of the drive source unit 40 described later.

駆動源ベース３０の外周面には、Ｏリング溝３０Ａが形成されて、そこに取り付けられたＯリング３０Ｌによって駆動源ベース３０の外周面とセンター孔１２の内周面との間がシールされている。また、駆動源ベース３０の下端面は、センター孔１２のうち第１横孔１４との連通部分より上方に位置し、これにより、センター孔１２の中間部が、流路１６の屈曲部１６Ａを挟んでメイン弁口１３と対向する本発明に係る支持凹部１７になっている。そして、支持凹部１７にメイン弁体２０が直動可能に嵌合されて、メイン弁体２０と駆動源ベース３０との間に本発明に係る背面部屋１８が形成されている。なお、支持凹部１７の上端側（奥側）には、メイン弁体２０と駆動源ベース３０との間に背面部屋１８を確保するためのリング状のスペーサ１８Ｓが嵌合固定されている。なお、スペーサ１８Ｓの代わりに、メイン弁体２０の上端部に凹部を設けて背面部屋１８の空間を確保してもよい。 An O-ring groove 30A is formed on the outer peripheral surface of the drive source base 30, and the space between the outer peripheral surface of the drive source base 30 and the inner peripheral surface of the center hole 12 is sealed by an O-ring 30L attached thereto. Yes. Further, the lower end surface of the drive source base 30 is located above the portion of the center hole 12 that communicates with the first lateral hole 14, so that the middle portion of the center hole 12 can bend the bent portion 16 A of the flow path 16. The support recess 17 according to the present invention is opposed to the main valve port 13 with being sandwiched therebetween. The main valve body 20 is fitted in the support recess 17 so as to be linearly movable, and the back chamber 18 according to the present invention is formed between the main valve body 20 and the drive source base 30. A ring-shaped spacer 18 S for securing the back chamber 18 is fitted and fixed between the main valve body 20 and the drive source base 30 on the upper end side (back side) of the support recess 17. Instead of the spacer 18S, a recess may be provided in the upper end portion of the main valve body 20 to secure the space of the back room 18.

メイン弁体２０の外周面は、上端側から順番に大径部２０Ａ、小径部２０Ｂ、テーパー部２０Ｃになっていて、大径部２０Ａが支持凹部１７に直動可能に支持されている。また、大径部２０Ａには、摺動リング溝２０Ｄが形成され、そこに、例えば、樹脂製の摺動リング２３が取り付けられている。そして、メイン弁体２０の大径部２０Ａ、センター孔１２の内周面、摺動リング２３及びスペーサ１８Ｓのそれぞれの間の隙間が本発明に係るオリフィス２０Ｓになっている。 The outer peripheral surface of the main valve body 20 is a large-diameter portion 20A, a small-diameter portion 20B, and a tapered portion 20C in order from the upper end side, and the large-diameter portion 20A is supported by the support recess 17 so as to be capable of linear movement. Further, a sliding ring groove 20D is formed in the large diameter portion 20A, and, for example, a resin sliding ring 23 is attached thereto. The gap between the large diameter portion 20A of the main valve body 20, the inner peripheral surface of the center hole 12, the sliding ring 23 and the spacer 18S is the orifice 20S according to the present invention.

メイン弁体２０の小径部２０Ｂは、大径部２０Ａより段付き状に小さく、その小径部２０Ｂの下端から徐々に縮径されるようにテーパー部２０Ｃが形成されている。また、テーパー部２０Ｃの下端部はメイン弁口１３の内径より小さくなっている。一方、メイン弁口１３の開口縁からは、メイン弁体２０側に弁口突壁１３Ｔが突出していて、その弁口突壁１３Ｔの上端の内側エッジ部分が弁座１３Ｚになっている。そして、メイン弁体２０は、図３に示すように、テーパー部２０Ｃが弁座１３Ｚに当接してメイン弁口１３を閉弁した閉弁位置と、図１に示すようにテーパー部２０Ｃが弁座１３Ｚから離間し、後端部がスペーサ１８Ｓに当接した開弁位置との間を直動する。 The small-diameter portion 20B of the main valve body 20 is stepped smaller than the large-diameter portion 20A, and a tapered portion 20C is formed so that the diameter is gradually reduced from the lower end of the small-diameter portion 20B. Further, the lower end portion of the tapered portion 20 C is smaller than the inner diameter of the main valve port 13. On the other hand, from the opening edge of the main valve port 13, a valve port protruding wall 13T protrudes toward the main valve body 20, and the inner edge portion of the upper end of the valve port protruding wall 13T is a valve seat 13Z. As shown in FIG. 3, the main valve body 20 has a valve closing position in which the taper portion 20C abuts the valve seat 13Z and closes the main valve port 13, and the taper portion 20C is valved as shown in FIG. It moves away from the seat 13Z and linearly moves between the valve opening position where the rear end portion is in contact with the spacer 18S.

メイン弁体２０の中心部には、本発明に係る弁体貫通孔２４が形成されている。また、弁体貫通孔２４の下端寄り位置には、メイン弁体２０の径方向に延びて小径部２０Ｂの側面に開口した連通流路２５が連通している。弁体貫通孔２４の内周面の上端寄り位置からはシール部材２０Ｅが張り出している。詳細には、メイン弁体２０は、軸方向で第１と第２の弁体構成部２１，２２に分割されている。また、第１と第２の弁体構成部２１，２２の互いの分割面の間にシート状のシール部材２０Ｅが挟まれて弁体貫通孔２４内に突出している。 A valve body through hole 24 according to the present invention is formed at the center of the main valve body 20. In addition, a communication channel 25 that extends in the radial direction of the main valve body 20 and opens on the side surface of the small diameter portion 20 B communicates with a position near the lower end of the valve body through hole 24. A seal member 20E projects from a position near the upper end of the inner peripheral surface of the valve body through hole 24. Specifically, the main valve body 20 is divided into first and second valve body constituting portions 21 and 22 in the axial direction. Further, a sheet-like seal member 20 E is sandwiched between the split surfaces of the first and second valve body components 21, 22 and protrudes into the valve body through hole 24.

駆動源ベース３０のうちメイン弁体２０との対向面の中央には中央凹部３２が形成され、その中央凹部３２の奥部から固定筒３１が延設されて弁体貫通孔２４に嵌合している。固定筒３１は、メイン弁体２０の直動位置に拘わらず、固定筒３１の先端面が弁体貫通孔２４のうちシール部材２０Ｅと連通流路２５の間に配置される長さをなしている。また、メイン弁体２０の上面には、弁体貫通孔２４の上端部を段付き状に拡径してバネ受容部２０Ｆが形成され、固定筒３１の外側に挿通された圧縮コイルバネ２６（本発明の「弾性部材」に相当する）が中央凹部３２の奥面とバネ受容部２０Ｆの段差面との間で突っ張っり状態になってメイン弁体２０を閉弁位置へと付勢している。 A central recess 32 is formed in the center of the driving source base 30 facing the main valve body 20, and a fixed cylinder 31 is extended from the inner part of the central recess 32 and fitted into the valve body through hole 24. ing. Regardless of the linear movement position of the main valve body 20, the fixed cylinder 31 has a length in which the front end surface of the fixed cylinder 31 is disposed between the seal member 20 E and the communication flow path 25 in the valve body through hole 24. Yes. Further, on the upper surface of the main valve body 20, a spring receiving portion 20 F is formed by expanding the upper end portion of the valve body through hole 24 in a stepped shape, and the compression coil spring 26 (the book) inserted through the outside of the fixed cylinder 31. (Corresponding to the “elastic member” of the present invention) is stretched between the back surface of the central recess 32 and the step surface of the spring receiving portion 20F to urge the main valve body 20 to the valve closing position. .

駆動源ベース３０の上面中央からは、円柱形の台座部３４が突出している。また、台座部３４の上端部の外径が段付き状に縮径され、そこに上端有底、下端開放の筒形ケース３５の下端部が嵌合されかつ溶接されている。また、筒形ケース３５の外側にコイル３７が嵌合されると共に、筒形ケース３５内にプランジャ３８が直動可能に収容されている。 A cylindrical pedestal 34 projects from the center of the upper surface of the drive source base 30. Further, the outer diameter of the upper end portion of the pedestal portion 34 is reduced in a stepped shape, and the lower end portion of the cylindrical case 35 with the upper end bottom and the lower end open is fitted and welded thereto. In addition, a coil 37 is fitted to the outside of the cylindrical case 35, and a plunger 38 is accommodated in the cylindrical case 35 so as to be linearly movable.

プランジャ３８の下端部は、段付き状に縮径された円柱部３９になっている。そして、その円柱部３９の外側に圧縮コイルバネ４１が嵌合されて、円柱部３９の後端側の段差面と台座部３４の端面との間で突っ張り状態となり、プランジャ３８を駆動源ベース３０から離間する側に付勢している。 The lower end portion of the plunger 38 is a cylindrical portion 39 that has a diameter reduced to a stepped shape. Then, the compression coil spring 41 is fitted to the outside of the cylindrical portion 39, and is stretched between the step surface on the rear end side of the cylindrical portion 39 and the end surface of the pedestal portion 34, and the plunger 38 is moved from the drive source base 30. It is energizing to the side to separate.

本実施形態では、上述した圧縮コイルバネ４１、プランジャ３８、コイル３７、筒形ケース３５及び駆動源ベース３０から、本発明の「駆動源」に相当する駆動源ユニット４０が構成されている。また、駆動源ユニット４０のうち筒形ケース３５の内側は、本発明に係るパイロット部屋３６になっていて、本発明に係る「区画壁」に相当する駆動源ベース３０により背面部屋１８とパイロット部屋３６とが区画されている。そして、駆動源ベース３０と固定筒３１とを本発明に係る筒貫通孔３３が貫通している。また、筒貫通孔３３の周りには、複数の連通路３０Ｂが形成され、それら連通路３０Ｂによって背面部屋１８とパイロット部屋３６との間が連絡されている。そして、連通路３０Ｂとパイロット部屋３６と筒貫通孔３３と弁体貫通孔２４とから本発明に係る圧力解放流路２４Ｒが構成されている。 In the present embodiment, the above-described compression coil spring 41, plunger 38, coil 37, cylindrical case 35, and drive source base 30 constitute a drive source unit 40 that corresponds to the “drive source” of the present invention. The inside of the cylindrical case 35 of the drive source unit 40 is a pilot room 36 according to the present invention, and the back room 18 and the pilot room are driven by the drive source base 30 corresponding to the “partition wall” according to the present invention. 36 is partitioned. A cylinder through hole 33 according to the present invention passes through the drive source base 30 and the fixed cylinder 31. A plurality of communication passages 30B are formed around the tube through-hole 33, and the back room 18 and the pilot room 36 are communicated with each other through the communication passages 30B. The communication passage 30B, the pilot chamber 36, the cylinder through hole 33, and the valve body through hole 24 constitute a pressure release flow path 24R according to the present invention.

筒貫通孔３３におけるパイロット部屋３６側の開口は本発明に係るパイロット弁口３３Ａをなし、そのパイロット弁口３３Ａの内側エッジ部が弁座３３Ｚになっている。これに対し、プランジャ３８の先端面中央からは円錐状のパイロット弁体４２が突出している。そして、コイル３７に通電すると、圧縮コイルバネ４１に抗してプランジャ３８が駆動源ベース３０側に移動してパイロット弁体４２のテーパー面が弁座３３Ｚに当接し、パイロット弁口３３Ａが閉弁される。 The opening on the pilot chamber 36 side in the tube through-hole 33 forms a pilot valve port 33A according to the present invention, and an inner edge portion of the pilot valve port 33A is a valve seat 33Z. On the other hand, a conical pilot valve body 42 protrudes from the center of the front end surface of the plunger 38. When the coil 37 is energized, the plunger 38 moves to the drive source base 30 side against the compression coil spring 41, the tapered surface of the pilot valve body 42 contacts the valve seat 33Z, and the pilot valve port 33A is closed. The

本実施形態の電動弁１０の構造に関する説明は以上である。次に、この電動弁１０の作用効果について説明する。この電動弁１０は、コイル３７に通電されていないと、図１に示すように、パイロット弁口３３Ａが開弁して圧力解放流路２４Ｒが開通し、背面部屋１８の内圧がメイン弁口１３より上流側の流路１６の屈曲部１６Ａの内圧より低くなる。これにより、メイン弁体２０のうち小径部２０Ｂと大径部２０Ａとの間の段差面とテーパー部２０Ｃとにかかる流体圧力によってメイン弁体２０を開弁側に押す開弁力が、背面部屋１８の内圧と圧縮コイルバネ２６の弾発力とによってメイン弁体２０を閉弁側に押す閉弁力に勝り、メイン弁体２０がメイン弁口１３の弁座１３Ｚから離れた開弁状態に保持される。 This completes the description of the structure of the motor-operated valve 10 of the present embodiment. Next, the function and effect of the motor-operated valve 10 will be described. In the motor-operated valve 10, when the coil 37 is not energized, as shown in FIG. 1, the pilot valve port 33 A is opened and the pressure release passage 24 R is opened, and the internal pressure in the back chamber 18 is changed to the main valve port 13. It becomes lower than the internal pressure of the bent portion 16A of the channel 16 on the more upstream side. As a result, the valve opening force that pushes the main valve body 20 toward the valve opening side by the fluid pressure applied to the step surface between the small diameter portion 20B and the large diameter portion 20A and the taper portion 20C of the main valve body 20 is The valve closing force that pushes the main valve element 20 toward the valve closing side is overcome by the internal pressure of 18 and the elastic force of the compression coil spring 26, and the main valve element 20 is held in the valve-opened state away from the valve seat 13 Z of the main valve port 13. Is done.

この状態でコイル３７に通電すると、図２に示すように、圧縮コイルバネ４１の弾発力に抗してプランジャ３８が駆動源ベース３０側に前進してパイロット弁体４２がパイロット弁口３３Ａを閉弁する。すると、メイン弁体２０の外周のオリフィス２０Ｓを通ってメイン弁口１３より上流側の流体圧力が背面部屋１８に取り込まれ、前記した閉弁力が開弁力に勝って、図３に示すようにメイン弁体２０がメイン弁口１３の弁座１３Ｚに当接して閉弁状態になる。また、メイン弁口１３が閉弁した状態では連通流路２５と弁体貫通孔２４との一部を通ってメイン弁口１３より上流側の流路１６の流体が、下流側の流路１６へと僅かに流れる。 When the coil 37 is energized in this state, as shown in FIG. 2, the plunger 38 moves forward toward the drive source base 30 against the elastic force of the compression coil spring 41, and the pilot valve element 42 closes the pilot valve port 33A. I speak. Then, the fluid pressure upstream of the main valve port 13 is taken into the back chamber 18 through the orifice 20S on the outer periphery of the main valve body 20, and the above-described valve closing force overcomes the valve opening force, as shown in FIG. The main valve body 20 is brought into contact with the valve seat 13Z of the main valve port 13 to be closed. In the state where the main valve port 13 is closed, the fluid in the flow channel 16 upstream from the main valve port 13 through a part of the communication flow channel 25 and the valve body through-hole 24 flows into the downstream flow channel 16. It flows slightly.

メイン弁口１３の閉弁状態でコイル３７への通電を止めると、圧縮コイルバネ４１の弾発力によってプランジャ３８と共にパイロット弁体４２が後退してパイロット弁口３３Ａが開弁した状態になる。すると、背面部屋１８の内圧がメイン弁口１３より下流側の流路１６に抜けて、再び、前記したメイン弁体２０に対する開弁力が閉弁力に勝るようになり、図１に示すように、メイン弁体２０が弁座１３Ｚから離間してメイン弁口１３が開弁状態になる。 When the energization of the coil 37 is stopped while the main valve port 13 is closed, the pilot valve body 42 is retracted together with the plunger 38 by the elastic force of the compression coil spring 41, and the pilot valve port 33A is opened. Then, the internal pressure in the back chamber 18 is released to the flow path 16 on the downstream side of the main valve port 13, and the valve opening force against the main valve body 20 is again superior to the valve closing force, as shown in FIG. In addition, the main valve body 20 is separated from the valve seat 13Z and the main valve port 13 is opened.

このように電動弁１０では、パイロット弁体４２を駆動してパイロット弁口３３Ａを開閉することでメイン弁体２０の背面側の背面部屋１８の内圧を変化させて、パイロット弁口３３Ａより口径が大きなメイン弁口１３を開閉することができる。そして、本実施形態の電動弁１０では、パイロット弁口３３Ａをベース部材１１Ｓに備えたので、パイロット弁口３３Ａをメイン弁体２０に備えた従来のものに比べて、パイロット弁体４２に必要な直動ストロークが短くなる。これにより、駆動源ユニット４０を小さくすることができ、駆動源ユニット４０の低コスト化と消費電力の削減を図ることが可能になる。 As described above, in the motor-operated valve 10, the pilot valve body 42 is driven to open and close the pilot valve port 33A, thereby changing the internal pressure of the back chamber 18 on the back side of the main valve body 20, so that the diameter of the pilot valve port 33A is larger. The large main valve port 13 can be opened and closed. In the motor-operated valve 10 according to the present embodiment, the pilot valve port 33A is provided in the base member 11S, so that it is necessary for the pilot valve body 42 as compared with the conventional valve valve 33A provided in the main valve body 20. Linear motion stroke is shortened. As a result, the drive source unit 40 can be reduced in size, and the cost of the drive source unit 40 can be reduced and the power consumption can be reduced.

また、圧力解放流路２４Ｒ全体をベース部材１１Ｓに形成する構造も考えられるが、本実施形態の電動弁１０では、圧力解放流路２４Ｒの一部をメイン弁体２０の弁体貫通孔２４で構成し、その弁体貫通孔２４にベース部材１１Ｓの固定筒３１を嵌合して、固定筒３１内の筒貫通孔３３の一端のパイロット弁口３３Ａをベース部材１１Ｓに配置したことで、メイン弁体２０の直動方向の延長上にパイロット弁口３３Ａ、パイロット弁体４２を配置することでき、電動弁１０をスリムな構造にすることができる。さらには、弁体貫通孔２４が、メイン弁口１３の閉弁時に微小な流量の流体を流す流路としても使用され、有効利用が図られる。 In addition, a structure in which the entire pressure release flow path 24R is formed in the base member 11S is conceivable, but in the electric valve 10 of the present embodiment, a part of the pressure release flow path 24R is formed by the valve body through hole 24 of the main valve body 20. By configuring and fitting the fixed cylinder 31 of the base member 11S into the valve body through hole 24 and arranging the pilot valve port 33A at one end of the cylinder through hole 33 in the fixed cylinder 31 in the base member 11S, The pilot valve port 33A and the pilot valve body 42 can be disposed on the extension of the valve body 20 in the linear motion direction, and the motor-operated valve 10 can have a slim structure. Further, the valve body through-hole 24 is used as a flow path for flowing a small flow rate of fluid when the main valve port 13 is closed, so that effective use is achieved.

［第２実施形態］
本実施形態の電動弁１０Ｖは、図５及び図６に示されており、前記実施形態の電動弁１０が、非通電時にメイン弁口１３が開いた状態になる、所謂、ノーマルオープン型であるのに対し、本実施形態の電動弁１０Ｖは、非通電時にメイン弁口１３が閉じた状態になる、所謂、ノーマルクローズ型になっている。具体的には、この電動弁１０Ｖの駆動源ユニット４０Ｖは、筒形ケース５２の上端部に円柱状のヨーク５３を嵌合して備え、それら筒形ケース５２及びヨーク５３の外側にコイル５７が嵌合されると共に、筒形ケース５２の内側にプランジャ５４が直動可能に収容されている。 [Second Embodiment]
The motor-operated valve 10V of this embodiment is shown in FIGS. 5 and 6, and the motor-operated valve 10 of the above-described embodiment is a so-called normal open type in which the main valve port 13 is opened when not energized. On the other hand, the motor-operated valve 10V of the present embodiment is a so-called normally closed type in which the main valve port 13 is closed when no power is supplied. Specifically, the drive source unit 40V of the electric valve 10V includes a cylindrical yoke 53 fitted to the upper end of the cylindrical case 52, and a coil 57 is provided outside the cylindrical case 52 and the yoke 53. The plunger 54 is accommodated inside the cylindrical case 52 so as to be linearly movable.

また、駆動源ベース３０の上面には、パイロット部屋３６Ｖが陥没形成され、そのパイロット部屋３６Ｖの内側面を段付き状に拡径したケース嵌合部３０Ｎに筒形ケース５２の下端部が嵌合固定されている。さらに、プランジャ５４には、上面にバネ収容凹部５４Ａが形成され、そこに収容された圧縮コイルバネ５６によりプランジャ５４が下方に付勢されている。そして、プランジャ５４から下方に突出した円柱部５５の先端に円錐状のパイロット弁体４２が備えられている。また、円柱部５５の下端部には、径方向に貫通する第１連通流路５５Ａが形成され、第１連通流路５５Ａからパイロット弁体４２の先端まで第２連通流路５５Ｂが延び、これら第１と第２の連通流路５５Ａ，５５Ｂによって本発明に係る「連通流路」が構成されている。 In addition, a pilot chamber 36V is formed in a recessed manner on the upper surface of the drive source base 30, and the lower end portion of the cylindrical case 52 is fitted to a case fitting portion 30N whose inner side surface of the pilot chamber 36V has a stepped diameter. It is fixed. Further, the plunger 54 has a spring accommodating recess 54A formed on the upper surface, and the plunger 54 is urged downward by a compression coil spring 56 accommodated therein. A conical pilot valve body 42 is provided at the tip of the cylindrical portion 55 that protrudes downward from the plunger 54. A first communication channel 55A penetrating in the radial direction is formed at the lower end of the cylindrical portion 55, and a second communication channel 55B extends from the first communication channel 55A to the tip of the pilot valve body 42. The “communication flow path” according to the present invention is constituted by the first and second communication flow paths 55A and 55B.

また、メイン弁体２０Ｖには、弁体貫通孔２４を囲みかつ駆動源ベース３０側に開放した筒形凹部１８Ｖが形成され、筒形凹部１８Ｖが背面部屋１８の一部を構成している。また、筒形凹部１８Ｖには、メイン弁体２０Ｖを閉弁側に付勢する圧縮コイルバネ２６が収容され、さらに、メイン弁体２０Ｖには、外側面と筒形凹部１８Ｖとの間を連絡するようにオリフィス５０が形成ている。その他の構成に関しては、第１実施形態の電動弁１０と同様である。 The main valve body 20 V is formed with a cylindrical recess 18 V that surrounds the valve body through hole 24 and is open to the drive source base 30 side, and the cylindrical recess 18 V forms a part of the back chamber 18. The cylindrical recess 18V accommodates a compression coil spring 26 that urges the main valve body 20V toward the valve closing side. Further, the main valve body 20V communicates between the outer surface and the cylindrical recess 18V. Thus, the orifice 50 is formed. About another structure, it is the same as that of the motor operated valve 10 of 1st Embodiment.

本実施形態の電動弁１０Ｖでは、コイル５７に通電していない状態で、図５に示すように、パイロット弁体４２にてパイロット弁口３３Ａが閉弁される。これにより、メイン弁口１３より上流側の流路１６の屈曲部１６Ａの内圧がオリフィス５０を通って背面部屋１８側に取り込まれ、メイン弁体２０Ｖに対する閉弁力が開弁力に勝ってメイン弁体２０Ｖがメイン弁口１３を閉弁する。また、この状態で、背面部屋１８内の僅かな流量の流体が、背面部屋１８、連通路３０Ｂ、第１と第２の連通流路５５Ａ，５５Ｂ及び弁体貫通孔２４等を通ってメイン弁口１３より下流側の流路１６へと流れる。 In the motor operated valve 10V of the present embodiment, the pilot valve port 33A is closed by the pilot valve body 42 as shown in FIG. As a result, the internal pressure of the bent portion 16A of the flow path 16 upstream of the main valve port 13 is taken into the back chamber 18 side through the orifice 50, and the valve closing force for the main valve body 20V overcomes the valve opening force. The valve body 20V closes the main valve port 13. In this state, a small amount of fluid in the back chamber 18 passes through the back chamber 18, the communication passage 30 B, the first and second communication channels 55 A and 55 B, the valve body through-hole 24, and the like. It flows to the flow path 16 on the downstream side from the port 13.

一方、コイル５７に通電すると、図６に示すように、プランジャ５４と共にパイロット弁体４２がヨーク５３側に移動してパイロット弁口３３Ａが開弁する。すると、背面部屋１８内の内圧がメイン弁口１３の下流側に抜け、メイン弁体２０Ｖに対する開弁力が閉弁力に勝ってメイン弁体２０Ｖが弁座１３Ｚから離間し、メイン弁口１３が開弁する。 On the other hand, when the coil 57 is energized, as shown in FIG. 6, the pilot valve body 42 moves to the yoke 53 side together with the plunger 54, and the pilot valve port 33A opens. Then, the internal pressure in the back chamber 18 is released to the downstream side of the main valve port 13, the valve opening force with respect to the main valve body 20V overcomes the valve closing force, and the main valve body 20V is separated from the valve seat 13Z. Opens.

このように、本実施形態の電動弁１０Ｖによっても、パイロット弁体４２を駆動してパイロット弁口３３Ａを開閉することでメイン弁体２０Ｖの背面側の背面部屋１８の内圧を変化させて、パイロット弁口３３Ａより口径が大きなメイン弁口１３を開閉することができる。そして、本実施形態の電動弁１０Ｖでは、メイン弁体２０Ｖのうち弁体貫通孔２４を囲むように形成された筒形凹部１８Ｖが背面部屋１８の一部を構成すると共に、メイン弁体２０Ｖを閉弁側に付勢する圧縮コイルバネ２６の収容部を兼ねているので、メイン弁体２０Ｖの直動方向で電動弁１０Ｖがコンパクトになる。また、オリフィス５０がメイン弁体２０Ｖの外側面から筒形凹部１８Ｖに貫通しているので、オリフィス５０を通した背面部屋１８への圧力の取り込みを安定して行うことができる。 As described above, the motor-operated valve 10V of the present embodiment also changes the internal pressure of the back chamber 18 on the back side of the main valve body 20V by driving the pilot valve body 42 to open and close the pilot valve port 33A. The main valve port 13 having a larger diameter than the valve port 33A can be opened and closed. And in the motor operated valve 10V of this embodiment, while the cylindrical recessed part 18V formed so that the valve body through-hole 24 may be enclosed among main valve bodies 20V comprises a part of back room 18, the main valve body 20V is changed. Since it also serves as a housing portion for the compression coil spring 26 that urges toward the valve closing side, the motor-operated valve 10V becomes compact in the direct acting direction of the main valve body 20V. Further, since the orifice 50 penetrates the cylindrical recess 18V from the outer surface of the main valve body 20V, the pressure can be stably taken into the back chamber 18 through the orifice 50.

［第３実施形態］
本実施形態の電動弁１０Ｗは、図７に示されており、前記第２実施形態の電動弁１０Ｖとは、駆動源ユニット４０Ｗの構成が異なり、ステッピングモータになっている。即ち、駆動源ベース３０のケース嵌合部３０Ｎに固定された筒形ケース３５Ｗは、薄肉の円筒管３５Ａの上端部を上蓋部材３５Ｂで閉塞してなる。そして、筒形ケース３５Ｗの外側にはリング状の界磁巻線ユニット４６が嵌合される一方、筒形ケース３５Ｗの内側には、ロータ４９が回転可能に収容されて、これら界磁巻線ユニット４６とロータ４９とを主要部としたステッピングモータが構成されている。なお、界磁巻線ユニット４６は、コネクタを介してコントローラに接続可能になっている。 [Third Embodiment]
The electric valve 10W of the present embodiment is shown in FIG. 7, and is different from the electric valve 10V of the second embodiment in the configuration of the drive source unit 40W and is a stepping motor. That is, the cylindrical case 35W fixed to the case fitting portion 30N of the drive source base 30 is formed by closing the upper end portion of the thin cylindrical tube 35A with the upper lid member 35B. A ring-shaped field winding unit 46 is fitted to the outside of the cylindrical case 35W, while a rotor 49 is rotatably accommodated inside the cylindrical case 35W. A stepping motor having the unit 46 and the rotor 49 as main parts is configured. The field winding unit 46 can be connected to the controller via a connector.

また、ロータ４９を回転可能に支持するために、筒形ケース３５Ｗの下端部が内側に直角曲げされて台座部３５Ｆが形成され、その台座部３５Ｆに固定されて上方に起立した筒形ブラケット４２の内側に支持スリーブ４３が固定されている。これに対し、ロータ４９は、上端有底、下端開放の筒形界磁部４５の上部中心にロッド部４４を貫通状態に固定した構造をなしている。そして、ロッド部４４のうち筒形界磁部４５内に位置している部分の上端部が、支持スリーブ４３内の上端部に直動可能かつ回転可能に支持され、ロッド部４４の下端部に形成された雄螺子部４４Ｂが、支持スリーブ４３の下端部に形成された雌螺子部４３Ｎに螺合している。また、筒形界磁部４５は、支持スリーブ４３を外側から覆った状態で筒形ケース３５Ｗの内面に隣接している。そして、界磁巻線ユニット４６と筒形界磁部４５との間の磁力によってロータ４９が回転駆動されながら上下動する。 Further, in order to rotatably support the rotor 49, the lower end portion of the cylindrical case 35W is bent at a right angle to the inside to form a pedestal portion 35F, which is fixed to the pedestal portion 35F and rises upward. A support sleeve 43 is fixed to the inner side of the cover. On the other hand, the rotor 49 has a structure in which the rod portion 44 is fixed in a penetrating state at the upper center of the cylindrical field portion 45 having an upper end bottom and an open lower end. The upper end portion of the rod portion 44 located in the cylindrical field portion 45 is supported by the upper end portion in the support sleeve 43 so as to be linearly movable and rotatable, and on the lower end portion of the rod portion 44. The formed male screw portion 44 B is screwed into a female screw portion 43 N formed at the lower end portion of the support sleeve 43. Further, the cylindrical field part 45 is adjacent to the inner surface of the cylindrical case 35W in a state where the support sleeve 43 is covered from the outside. Then, the rotor 49 moves up and down while being rotationally driven by the magnetic force between the field winding unit 46 and the cylindrical field part 45.

なお、ロッド部４４のうち筒形界磁部４５より上側部分には、線材を螺旋状に巻き付けた螺旋ガイド４６Ｇが備えられ、その螺旋ガイド４６Ｇに係合しているストッパリング４７のアーム部４７Ａが、筒形ケース３５Ｗの上蓋部材３５Ｂから垂下されたストッパシャフト４８に当接している。そして、ロータ４９が回転すると、ストッパリング４７が螺旋ガイド４６Ｇに対して相対回転して上下動し、螺旋ガイド４６Ｇの上端部又は下端部まで移動したときに回動不能となってロータ４９の回転を規制する。 In addition, a spiral guide 46G in which a wire rod is spirally wound is provided in a portion of the rod portion 44 above the cylindrical field portion 45, and an arm portion 47A of a stopper ring 47 engaged with the spiral guide 46G. Is in contact with a stopper shaft 48 suspended from the upper lid member 35B of the cylindrical case 35W. When the rotor 49 rotates, the stopper ring 47 rotates relative to the spiral guide 46G and moves up and down, and when the rotor ring 49 moves to the upper end portion or the lower end portion of the spiral guide 46G, the rotation becomes impossible. To regulate.

また、ロッド部４４の下端部は下端開放の筒部４４Ｃになっていて、その筒部４４Ｃ内に圧縮コイルバネ５１が収容され、その下方に直動シャフト４２Ｓの上端部が直動可能に収容されている。また、直動シャフト４２Ｓの上端に備えたフランジ４２Ｆが、筒部４４Ｃの下端部に嵌合固定されたブッシュ４４Ｔに上方から当接して筒部４４Ｃ内に抜け止めされている。これにより、直動シャフト４２Ｓがロータ４９と共に上下動する。そして、直動シャフト４２Ｓの下端部がテーパー状にパイロット弁体４２になっていて、そのテーパー面４２Ｔがパイロット弁口３３Ａに突入するようになっている。 Further, the lower end portion of the rod portion 44 is a cylindrical portion 44C having an open lower end. The compression coil spring 51 is accommodated in the cylindrical portion 44C, and the upper end portion of the linear motion shaft 42S is accommodated in the lower portion thereof so as to be linearly movable. ing. Further, a flange 42F provided at the upper end of the linear movement shaft 42S is in contact with the bush 44T fitted and fixed to the lower end of the cylindrical portion 44C from above, and is prevented from coming off in the cylindrical portion 44C. Thereby, the linear motion shaft 42 S moves up and down together with the rotor 49. The lower end portion of the linear motion shaft 42S is tapered to form a pilot valve body 42, and the tapered surface 42T enters the pilot valve port 33A.

本実施形態の電動弁１０Ｗによれば、駆動源ユニット４０Ｗにてパイロット弁体４２の位置を制御してパイロット弁口３３Ａの開度を徐々に変更し、メイン弁口１３の閉弁時に圧力解放流路２４Ｒを通してメイン弁口１３の上流側から下流側に流す流体の流量を制御することが可能になる。詳細には、オリフィス５０の内径以下の小流量範囲で任意の流量制御ができ、オリフィス５０の内径以上の流量ではメイン弁体２０Ｖがメイン弁口１３を開いて大流量を得ることが可能になり、有効利用が図られる。 According to the electric valve 10W of this embodiment, the position of the pilot valve body 42 is controlled by the drive source unit 40W to gradually change the opening degree of the pilot valve port 33A, and the pressure is released when the main valve port 13 is closed. It becomes possible to control the flow rate of the fluid flowing from the upstream side to the downstream side of the main valve port 13 through the flow path 24R. Specifically, an arbitrary flow rate control can be performed within a small flow rate range equal to or smaller than the inner diameter of the orifice 50, and a large flow rate can be obtained by the main valve body 20V opening the main valve port 13 at a flow rate larger than the inner diameter of the orifice 50. Effective use is planned.

［他の実施形態］
本発明は、前記実施形態に限定されるものではなく、上記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。 [Other Embodiments]
The present invention is not limited to the above-described embodiment, and can be implemented with various modifications other than those described above without departing from the scope of the invention.

１０，１０Ｖ，１０Ｗ電動弁
１１Ｓベース部材
１３メイン弁口
１６流路
１６Ａ屈曲部
１７支持凹部
１８背面部屋
１８Ｖ筒形凹部
２０メイン弁体
２０Ｓ，５０オリフィス
２０Ｖメイン弁体
２４弁体貫通孔
２４Ｒ圧力解放流路
２６圧縮コイルバネ（弾性部材）
３０駆動源ベース（区画壁）
３０Ｂ連通路
３１固定筒
３３筒貫通孔
３３Ａパイロット弁口
３６，３６Ｖパイロット部屋
３７コイル
４０，４０Ｖ，４０Ｗ駆動源ユニット（駆動源）
４１圧縮コイルバネ
４２パイロット弁体
４２Ｔテーパー面
５５Ａ，５５Ｂ連通流路 10, 10V, 10W Motorized valve 11S Base member 13 Main valve port 16 Flow path 16A Bending portion 17 Supporting concave portion 18 Back chamber 18V Cylindrical concave portion 20 Main valve body 20S, 50 Orifice 20V Main valve body 24 Valve body through hole 24R Pressure release Flow path 26 Compression coil spring (elastic member)
30 Drive source base (partition wall)
30B Communication path 31 Fixed cylinder 33 Tube through hole 33A Pilot valve port 36, 36V Pilot room 37 Coil 40, 40V, 40W Drive source unit (drive source)
41 Compression coil spring 42 Pilot valve body 42T Taper surface 55A, 55B Communication flow path

Claims

The bent flow path (16), the main valve port (13) disposed on the downstream side of the bent portion (16A) of the flow path (16), and the bent portion (16A) of the flow path (16). A support recess (17) opposed to the main valve port (13) is provided in the base member (11S), and the main valve body (20) is fitted in the support recess (17) so as to be directly movable. A back chamber (18) is formed on the back side of the main valve body (20), and the internal pressure of the bent portion (16A) upstream from the main valve port (13) is taken into the back chamber (18). An orifice (20S, 50), a pressure release channel (24R) for releasing the internal pressure of the back chamber (18) to the channel (16) downstream from the main valve port (13), and the pressure release A pilot valve body (42) for opening and closing the flow path (24R); Comprising a driving source for driving the lot valve body (42) and (40,40V, 40W), and an elastic member (26) for biasing the main valve body (20) in the valve-closing side,
When the pressure release channel (24R) is closed, a valve closing force that pushes the main valve body (20) toward the valve closing side is generated by the internal pressure of the back chamber (18) and the elastic force of the elastic member (26). The main valve port (13) is closed by overcoming the valve opening force that pushes the main valve body (20) toward the valve opening side by the internal pressure of the flow path (16) upstream from the main valve port (13). On the other hand, when the pressure release channel (24R) is opened, in the motor operated valve (10, 10V, 10W) in which the valve opening force overcomes the valve closing force and the main valve port (13) is opened,
At least a part of the pressure release channel (24R) is formed in the base member (11S), and the pilot valve element (24R) is formed in a part of the pressure release channel (24R) formed in the base member (11S). 42) A motor-operated valve (10, 10V, 10W) having a pilot valve port (33A) opened and closed by 42).

A valve body through hole (24) penetrating the main valve body (20) in the linear motion direction;
The base member (11S) is formed with a partition wall (30) on the opposite side to the main valve body (20) with respect to the back chamber (18), and the pilot valve body (42) is accommodated. Pilot room (36, 36V),
A fixed cylinder (31) protruding from the partition wall (30) and having a distal end portion fitted constantly in the valve body through hole (24);
A cylinder through hole (33) penetrating the partition wall (30) and the fixed cylinder (31);
A communication passage (30B) is provided in the partition wall (30) and communicates between the back room (18) and the pilot room (36, 36V) on the side of the cylindrical through hole (33). And
An opening on the pilot chamber (36, 36V) side in the cylindrical through hole (33) forms the pilot valve port (33A),
The pressure release passage (24R) is constituted by the tube through hole (33), the valve body through hole (24), the pilot chamber (36, 36V), and the communication passage (30B). (10, 10V, 10W).

The fluid extends from the valve body through-hole (24) to the side and opens on the side surface of the main valve body (20), so that the flow rate of the fluid is smaller than that of the main valve port (13). The motor-operated valve (10) according to claim 2, further comprising a communication channel (25) that allows flow from the upstream channel (16) to the valve body through hole (24).

Allowed to flow from the pilot chamber (36V) to the tubular through hole (33), which is formed in the pilot valve body (42) and has a minute flow rate compared to the fluid passing through the orifice (50). The motor-operated valve (10V) according to claim 2, further comprising a communication flow path (55A, 55B).

The main valve body (20V) is formed with a cylindrical recess (18V) that surrounds the valve body through hole (24) and opens to the opposite side of the main valve port (13). ) Constitutes at least a part of the back chamber (18), and a compression coil spring (26) as the elastic member (26) is accommodated in the cylindrical recess (18V),
The motor operated valve (10V, 10W) according to any one of claims 2 to 4, wherein the orifice (50) penetrates the cylindrical recess (18V) from an outer surface of the main valve body (20V). ).

The pilot valve body (42) has a tapered surface (42T) tapered toward the pilot valve port (33A), and the drive source (40W) capable of controlling the position of the pilot valve body (42). The motor-operated valve (10W) according to any one of claims 2 to 5, comprising a motor (40W).