JP2005344628A

JP2005344628A - Valve gear

Info

Publication number: JP2005344628A
Application number: JP2004165894A
Authority: JP
Inventors: Norio Wada; 則夫和田; Koji Matsui; 浩二松井; Masanori Shimizu; 正則清水
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2004-06-03
Filing date: 2004-06-03
Publication date: 2005-12-15
Anticipated expiration: 2024-06-03
Also published as: JP4176676B2

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the sealability of a valve element 11 from lowering due to a temperature rise in a linear actuator type valve gear having a valve stem 12 opening/closing the valve element 11 by reciprocatingly moving it in the axial direction, a permanent magnet part 126 fitted to the valve stem 12, and an electromagnetic device 30 reciprocatingly moving the valve stem 12 by the axial component of a magnetic force acting thereon from the permanent magnet part 126. <P>SOLUTION: This valve gear comprises first spring devices 14 and 15 for acting an axial energizing force in a direction for closing the valve element 11 on the valve stem 12 as a spring pressure. The first spring devices 14 and 15 comprise a first shape memory member 15 varying in shape so as to increase the spring pressure according to a temperature rise. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、リニアアクチュエータ式の弁装置に関するものである。 The present invention relates to a linear actuator type valve device.

図６は、リニアアクチュエータ式の弁装置の従来例の断面図である。
一端に弁体(11)を具備する弁軸(12)の他端近傍には、第１，第２永久磁石(21)(22)が埋設されており、第１永久磁石(21)のＮ極は後述のアクチュエータ(30)側に向いていると共に、他方の第２永久磁石(22)のＳ極はアクチュエータ(30)側に向いている。
前記弁軸(12)の側方に配設されたアクチュエータ(30)のヨーク(31)は、その両端部に位置するサイド磁極部(34)(36)を備えていると共に、該サイド磁極部(34)(36)の相互間には中央磁極部(35)が位置している。又、該中央磁極部(35)は、外周に電磁コイル(38)が巻回されたコア(37)の先端に位置しており、更に、コア(37)の後端とヨーク(31)の間にはギャップ(39)が形成されている。 FIG. 6 is a sectional view of a conventional example of a linear actuator type valve device.
In the vicinity of the other end of the valve shaft (12) having the valve body (11) at one end, first and second permanent magnets (21) and (22) are embedded, and N of the first permanent magnet (21) is embedded. The pole faces the actuator (30) described later, and the S pole of the other second permanent magnet (22) faces the actuator (30).
The yoke (31) of the actuator (30) disposed on the side of the valve shaft (12) includes side magnetic pole portions (34) and (36) located at both ends thereof, and the side magnetic pole portion The central magnetic pole part (35) is located between (34) and (36). The central magnetic pole portion (35) is located at the tip of the core (37) around which the electromagnetic coil (38) is wound on the outer periphery, and further, the rear end of the core (37) and the yoke (31) A gap (39) is formed between them.

一方のサイド磁極部(34)と中央磁極部(35)と更に他方のサイド磁極部(36)は、弁軸(12)の長さ方向に沿うように配列されていると共に、弁軸(12)を隔ててアクチュエータ(30)の反対側には補助ヨーク(32)が設けられており、該補助ヨーク(32)と前記ヨーク(31)との間隙(33)内に弁軸(12)が往復移動自在に挿入されている。
このものでは、電磁コイル(38)が非通電状態にあるときには、磁気ギャップ(39)の磁気抵抗は、第１永久磁石(21)及び第２永久磁石(22)の磁力に対して大きいから、第１永久磁石(21)のＮ極→一方のサイド磁極部(34)→ヨーク(31)内→他方のサイド磁極部(36)→第２永久磁石(22)のＳ極→第２永久磁石(22)のＮ極→補助ヨーク(32)→第１永久磁石(21)のＳ極の如く周回する磁路と、第１永久磁石(21)のＮ極→中央磁極部(35)→第２永久磁石(22)のＳ極→第２永久磁石(22)のＮ極→補助ヨーク(32)→着磁部材第１永久磁石(21)のＳ極の如く周回する磁路が形成されるように、第１永久磁石(21)及び第２永久磁石(22)は弁軸１２と共に所定位置に位置づけられる。 One side magnetic pole part (34), the central magnetic pole part (35), and the other side magnetic pole part (36) are arranged along the length direction of the valve shaft (12) and the valve shaft (12 ), An auxiliary yoke (32) is provided on the opposite side of the actuator (30), and the valve shaft (12) is placed in a gap (33) between the auxiliary yoke (32) and the yoke (31). It is inserted reciprocally.
In this case, when the electromagnetic coil (38) is in a non-energized state, the magnetic resistance of the magnetic gap (39) is larger than the magnetic force of the first permanent magnet (21) and the second permanent magnet (22). N pole of the first permanent magnet (21) → one side magnetic pole part (34) → inside the yoke (31) → the other side magnetic pole part (36) → S pole of the second permanent magnet (22) → second permanent magnet (22) N pole → Auxiliary yoke (32) → Surrounding magnetic path like S pole of the first permanent magnet (21), N pole of the first permanent magnet (21) → Center magnetic pole part (35) → No. 2 A magnetic path is formed such as the S pole of the permanent magnet (22) → the N pole of the second permanent magnet (22) → the auxiliary yoke (32) → the S pole of the magnetized member first permanent magnet (21). Thus, the first permanent magnet (21) and the second permanent magnet (22) are positioned at a predetermined position together with the valve shaft 12.

一方、電磁コイル(38)を通電状態にすると、コア(37)の内部に磁束が生成されると共に、この磁束はヨーク(31)内に分布して各磁極部(34)(35)(36)の各々の表面に磁極を生じさせる。この場合、両サイド磁極部(34)(36)の極性は相互に同一になる一方、中央磁極部(35)の極性は両サイド磁極部(34)(36)に生じる磁極の極性とは逆極性になる。 On the other hand, when the electromagnetic coil (38) is energized, a magnetic flux is generated inside the core (37), and this magnetic flux is distributed in the yoke (31) and is distributed to the magnetic pole portions (34) (35) (36). ) To generate a magnetic pole on each surface. In this case, the polarities of both side magnetic pole portions (34) and (36) are the same, while the polarity of the central magnetic pole portion (35) is opposite to the polarity of the magnetic poles generated at both side magnetic pole portions (34) and (36). Become polar.

さて、両サイド磁極部(34)(36)にＳ極を発生させ、中央磁極部(35)にＮ極を発生させる方向の電流を電磁コイル(38)に供給した場合には、第１永久磁石(21)のＮ極は中央磁極部(35)と反発する一方サイド磁極部(34)と引き合うから図６の矢印Ａ方向の閉弁力が生じる。又、第２永久磁石(22)のＳ極は中央磁極部(35)と引き合う一方サイド磁極部(36)と反発するから上記と同様に図６の矢印Ａ方向の閉弁力が生じ、これら２つの閉弁力の合力で弁体(11)が閉弁動作する。これとは逆に、両サイド磁極部(34)(36)にＮ極を発生させ、中央磁極部(35)にＳ極を発生させる方向の電流を電磁コイル(38)に供給した場合には、第１永久磁石(21)のＮ極は中央磁極部(35)と引き合う一方サイド磁極部(34)と反発するから図６の矢印Ｂ方向の開弁力が生じる。又、第２永久磁石(22)のＳ極は中央磁極部(35)と反発する一方サイド磁極部(36)と引き合うから上記と同様に図６の矢印Ｂ方向の開弁力が生じ、これら２つの開弁力の合力で弁体(11)が開弁動作する。
特開２０００−１９９４１１号公報 When the south pole is generated in both side magnetic pole portions (34) and (36) and the current in the direction to generate the N pole in the central magnetic pole portion (35) is supplied to the electromagnetic coil (38), the first permanent Since the N pole of the magnet (21) repels the central magnetic pole part (35) and attracts the side magnetic pole part (34), a valve closing force in the direction of arrow A in FIG. 6 is generated. Further, since the south pole of the second permanent magnet (22) attracts the central magnetic pole part (35) and repels the side magnetic pole part (36), the valve closing force in the direction of arrow A in FIG. The valve body (11) is closed by the resultant force of the two valve closing forces. On the contrary, when the N pole is generated in both side magnetic pole portions (34) and (36) and the current in the direction to generate the S pole in the central magnetic pole portion (35) is supplied to the electromagnetic coil (38). Since the N pole of the first permanent magnet (21) attracts the central magnetic pole part (35) and repels the side magnetic pole part (34), a valve opening force in the direction of arrow B in FIG. 6 is generated. Further, since the south pole of the second permanent magnet (22) repels the central magnetic pole part (35) and attracts the side magnetic pole part (36), the valve opening force in the direction of arrow B in FIG. The valve element (11) opens by the resultant force of the two valve opening forces.
JP 2000-199411 A

しかしながら、上記従来のものでは、例えば、屋外設置型給湯器のガス弁等として使用すると、夏の暑い日等には第１，第２永久磁石(21)(22)が温度上昇して磁力低下を来たし（代表例として、フェライト磁石の場合は１℃上昇すると約０．１８％の割合で減少するが、この減少割合は材質によって異なる。）、その結果、弁体(11)の閉弁力や開弁力が低くなって次の問題が生じる。
(A)．弁体(11)の閉弁力が低下すると、該弁体(11)によるシール性能が悪くなってガス漏れが発生する心配がある。
(B)．弁体(11)の開弁力が低下すると、開弁時に於ける弁体(11)の開度低下を来たし、ガスの流量不足が生じる。 However, in the above-mentioned conventional ones, for example, when used as a gas valve of an outdoor water heater, the temperature of the first and second permanent magnets (21) and (22) rises and the magnetic force decreases on a hot summer day. (As a typical example, in the case of a ferrite magnet, if it rises by 1 ° C, it decreases at a rate of about 0.18%, but this rate of reduction varies depending on the material.) As a result, the valve closing force of the valve element (11) The valve opening force becomes low and the following problems occur.
(A). When the valve closing force of the valve body (11) is reduced, the sealing performance by the valve body (11) is deteriorated, and there is a concern that gas leakage occurs.
(B). When the valve opening force of the valve body (11) is reduced, the opening degree of the valve body (11) is lowered when the valve is opened, and the gas flow rate is insufficient.

本発明は、係る点に鑑みて成されたもので、
『軸方向に往復移動して弁体(11)を開閉させる弁軸(12)と、
前記弁軸(12)に設けられた永久磁石部と、
前記永久磁石部との間で作用する磁力の前記軸方向成分によって前記弁軸(12)を前記往復移動させる電磁石装置と、を具備するリニアアクチュエータ式の弁装置』に於いて、請求項１に係る発明は、温度上昇に伴なって弁体(11)によるシール性が低下するのを防止することをその課題とする。
又、請求項２に係る発明は、温度上昇に伴なって弁体(11)の開度が低下するのを防止することをその課題とする。 The present invention has been made in view of the above points.
`` Valve shaft (12) that opens and closes valve body (11) by reciprocating in the axial direction;
A permanent magnet provided on the valve stem (12);
In the linear actuator type valve device, comprising: an electromagnet device that reciprocally moves the valve shaft (12) by the axial component of the magnetic force acting between the permanent magnet portions. It is an object of the present invention to prevent the sealing performance of the valve element (11) from being lowered as the temperature rises.
Another object of the invention according to claim 2 is to prevent the opening of the valve element (11) from being lowered as the temperature rises.

［請求項１に係る発明］
上記課題を解決する為の請求項１に係る発明の技術的手段は、
『前記弁体(11)を閉弁させる方向の軸方向付勢力をバネ圧として前記弁軸(12)に作用させる為の第１のバネ装置を備え、
前記第１のバネ装置は、温度上昇に伴なって前記バネ圧を増加させるように形状変化する第１の形状記憶部材を具備する』ことである。
上記技術的手段によれば、弁体(11)を開閉させる駆動力としては、弁軸(12)に設けられた永久磁石部と電磁石装置との間で作用する磁力以外に、弁軸(12)を閉弁方向に付勢する為の第１のバネ装置からのバネ圧も作用する。
そして、既述従来例で説明したように、弁軸(12)に設けられた永久磁石部の磁力が温度上昇に伴なって弱くなって弁体(11)の閉弁力が低下しそうになると、第１の形状記憶部材が、第１のバネ装置のバネ圧を増加させるように形状変化し、該バネ圧によって弁軸(12)を閉方向へ付勢する力が増加し、これにより、弁体(11)の閉弁力の低下が抑えられてシール性の低下が防止される。 [Invention of Claim 1]
The technical means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
“A first spring device for causing the valve shaft (12) to act on the valve shaft (12) as an axial biasing force in a direction in which the valve body (11) is closed,
The first spring device includes a first shape memory member whose shape changes so as to increase the spring pressure as the temperature rises.
According to the above technical means, the driving force for opening and closing the valve body (11) includes the valve shaft (12) in addition to the magnetic force acting between the permanent magnet portion provided on the valve shaft (12) and the electromagnet device. The spring pressure from the first spring device for energizing the valve in the valve closing direction also acts.
And, as explained in the above-mentioned conventional example, when the magnetic force of the permanent magnet portion provided on the valve shaft (12) becomes weak as the temperature rises, the valve closing force of the valve body (11) is likely to decrease. The first shape memory member changes its shape so as to increase the spring pressure of the first spring device, and the force that urges the valve shaft (12) in the closing direction by the spring pressure increases. A decrease in the valve closing force of the valve body (11) is suppressed, and a decrease in sealing performance is prevented.

［請求項２に係る発明］
上記課題を解決する為の請求項２の発明の技術的手段は、
『前記弁体(11)を開弁させる方向の軸方向付勢力をバネ圧として前記弁軸(12)に作用させる為の第２のバネ装置を備え、
前記第２のバネ装置は、温度上昇に伴なって前記バネ圧を増加させるように形状変化する第２の形状記憶部材を具備する』ことである。
上記技術的手段によれば、弁軸(12)に設けられた永久磁石部の磁力が温度上昇に伴なって低下することに起因して弁体(11)の開弁力が低下しそうになると、第２の形状記憶部材が、第２のバネ装置のバネ圧（弁軸(12)を開弁方向に付勢に付勢する力）を増加させるように形状変化し、これにより、第２のバネ装置による弁体(11)の開弁付勢力が増加する。よって、第２のバネ装置による弁体(11)の開弁付勢力が増加する分、温度上昇に基づく該弁体(11)の開度低下を防止することができる。 [Invention of Claim 2]
The technical means of the invention of claim 2 for solving the above-mentioned problem is as follows:
“A second spring device for causing the valve shaft (12) to act on the valve shaft (12) as an axial biasing force in a direction to open the valve body (11),
The second spring device includes a second shape memory member whose shape changes so as to increase the spring pressure as the temperature rises.
According to the above technical means, when the magnetic force of the permanent magnet portion provided on the valve shaft (12) decreases as the temperature increases, the valve opening force of the valve body (11) is likely to decrease. The shape of the second shape memory member is changed so as to increase the spring pressure of the second spring device (the force that biases the valve shaft (12) in the valve opening direction). The valve opening urging force of the valve element (11) by the spring device increases. Therefore, the opening degree of the valve body (11) can be prevented from being lowered due to the temperature rise by the increase of the valve opening urging force of the valve body (11) by the second spring device.

［請求項３に係る発明]
既述請求項１，２の課題を同時に解決する為には、
『請求項１の構成に対して、請求項２の構成を組み合わせた構成とし、
前記第１の形状記憶部材は、前記弁体(11)で開閉される弁口を具備する流路に設けられており、
前記第２の形状記憶部材は、前記電磁石装置への通電に基づく発生熱が伝達される領域に配設され、
前記第２のバネ装置は前記第１のバネ装置より弱いバネ圧に設定されている』ものとすることができる。
上記技術的手段によれば、温度上昇に伴なって請求項１の発明と同様の作用が得られ、これにより、第１のバネ装置のバネ力が増加して弁体(11)の閉弁力低下が防止される。尚、温度上昇に伴なって第２のバネ装置のバネ圧が請求項２のものと同様に変化して弁体(11)の開弁付勢力が増加するが、第２のバネ装置のバネ圧は第１のバネ装置のバネ圧より弱く設定されている。従って、第２のバネ装置のバネ圧変化による弁体(11)の閉弁力低下の影響は少ないことから、該第２のバネ装置のバネ圧と第１のバネ装置のバネ圧の合力は、弁体(11)の閉弁力を増加させる方向に変化し、これにより、弁体(11)の閉弁力低下が防止される。 [Invention of Claim 3]
In order to solve the problems of claims 1 and 2 at the same time,
“The configuration of claim 1 is combined with the configuration of claim 2,
The first shape memory member is provided in a flow path having a valve opening opened and closed by the valve body (11),
The second shape memory member is disposed in a region where generated heat based on energization to the electromagnet device is transmitted,
The second spring device is set to a spring pressure weaker than that of the first spring device ”.
According to the above technical means, an action similar to that of the first aspect of the invention can be obtained as the temperature rises, whereby the spring force of the first spring device is increased and the valve element (11) is closed. Power loss is prevented. As the temperature rises, the spring pressure of the second spring device changes in the same manner as in claim 2 and the valve opening biasing force of the valve element (11) increases. The pressure is set to be weaker than the spring pressure of the first spring device. Therefore, since the influence of a decrease in the valve closing force of the valve element (11) due to a change in the spring pressure of the second spring device is small, the resultant force of the spring pressure of the second spring device and the spring pressure of the first spring device is Then, the valve body (11) changes in the direction of increasing the valve closing force, thereby preventing the valve body (11) from closing down.

一方、弁体(11)が開弁すると、これに伴なって流路に流れる流体によって第１の形状記憶部材が冷却されて温度低下すると共に、電磁石装置への通電に基づく発生熱で第２の形状記憶部材は温度上昇する。従って、流路に流体が流れ始めた後（弁体(11)が開弁した後）は、第１のバネ装置による弁体(11)の閉弁付勢力が小さくなると共に、第２のバネ装置の開弁付勢力が更に増大し、その結果、弁軸(12)が開弁位置に確実に移動され、これにより、温度上昇に伴なって弁体(11)の開弁度が低下するのを防止することができる。 On the other hand, when the valve element (11) is opened, the first shape memory member is cooled by the fluid flowing in the flow path and the temperature is lowered, and the generated heat based on the energization of the electromagnet device generates the second. The shape memory member increases in temperature. Therefore, after the fluid starts to flow in the flow path (after the valve element (11) is opened), the valve-closing urging force of the valve element (11) by the first spring device becomes small and the second spring The valve opening urging force of the device further increases, and as a result, the valve shaft (12) is reliably moved to the valve opening position, and as a result, the valve opening degree of the valve body (11) decreases as the temperature rises. Can be prevented.

［請求項４に係る発明]
請求項３に係る発明は、弁体(11)を開弁させる方向の軸方向付勢力を第２のバネ装置から弁軸(12)に付与したが、該第２のバネ装置に代えて、第１のバネ装置と同方向のバネ圧（閉弁方向付勢力）を弁軸(12)に付与する構成を採用することができる。
この為に採用した請求項４に係る発明の技術的手段は、
『前記弁体(11)を閉弁させる方向の軸方向付勢力をバネ圧として前記弁軸(12)に作用させる為の第１のバネ装置と第３のバネ装置を備え、
前記第１のバネ装置は、温度上昇に伴なって前記バネ圧を増加させるように形状変化する第１の形状記憶部材を具備しており、前記第３のバネ装置は、温度上昇に伴なって前記バネ圧を低減させるように形状変化する第３の形状記憶部材を具備し、
前記第１の形状記憶部材は、前記弁体(11)で開閉される弁口を具備する流路に設けられており、
前記第３の形状記憶部材は、前記電磁石装置への通電に基づく発生熱が伝達される領域に配設され、
前記第３のバネ装置は前記第１のバネ装置より弱いバネ圧に設定されている』ことである。
上記技術的手段によれば、温度上昇に伴なって請求項１の発明と同様の作用が得られ、これにより、第１のバネ装置のバネ力が増加して弁体(11)の閉弁力低下が防止される。 [Invention according to claim 4]
In the invention according to claim 3, the axial biasing force in the direction to open the valve body (11) is applied from the second spring device to the valve shaft (12). However, instead of the second spring device, A configuration in which spring pressure (valve closing direction urging force) in the same direction as the first spring device is applied to the valve shaft (12) can be employed.
The technical means of the invention according to claim 4 adopted for this purpose is as follows:
“A first spring device and a third spring device for causing the valve shaft (12) to act on the valve shaft (12) as an axial urging force in a direction to close the valve body (11),
The first spring device includes a first shape memory member that changes in shape so as to increase the spring pressure as the temperature rises, and the third spring device accompanies a rise in temperature. A third shape memory member that changes its shape so as to reduce the spring pressure.
The first shape memory member is provided in a flow path having a valve opening opened and closed by the valve body (11),
The third shape memory member is disposed in a region where heat generated based on energization to the electromagnet device is transmitted,
The third spring device is set to a spring pressure weaker than that of the first spring device.
According to the above technical means, an action similar to that of the first aspect of the invention can be obtained as the temperature rises, whereby the spring force of the first spring device is increased and the valve element (11) is closed. Power loss is prevented.

一方、弁体(11)が開弁すると、電磁石装置への通電に基づく発生熱等によって、弁軸(12)に設けられた永久磁石部が温度上昇して磁力低下し、これにより、弁体(11)の開弁力が低下しそうになると、第３の形状記憶部材が、第３のバネ装置のバネ圧を低減させるように形状変化し、これにより、該バネ圧によって弁軸(12)を閉方向へ付勢する力が減少する。よって、第３のバネ装置による弁体(11)の閉方向への付勢力が小さくなる分、温度上昇に基づく該弁体(11)の開度低下を防止することができる。
尚、弁体(11)が開弁すると、これに伴なって流路に流れる流体によって第１の形状記憶部材が冷却されて温度低下することから、流路に流体が流れ始めた後（弁体(11)が開弁した後）は、第１のバネ装置による弁体(11)の閉弁付勢力が小さくなることは、上記請求項３に係る発明と同様である。 On the other hand, when the valve body (11) is opened, the permanent magnet portion provided on the valve shaft (12) rises in temperature due to heat generated based on energization of the electromagnet device, and the magnetic force is reduced. When the valve opening force of (11) is likely to decrease, the shape of the third shape memory member changes so as to reduce the spring pressure of the third spring device, whereby the valve shaft (12) is caused by the spring pressure. The force that urges in the closing direction decreases. Therefore, the opening force of the valve body (11) can be prevented from being lowered due to the temperature rise because the urging force of the third spring device in the closing direction of the valve body (11) is reduced.
When the valve element (11) is opened, the first shape memory member is cooled by the fluid flowing in the flow path and the temperature is lowered. Therefore, after the fluid starts to flow in the flow path (valve After the body (11) is opened), the valve-closing urging force of the valve body (11) by the first spring device is the same as in the third aspect of the invention.

本発明は次の特有の効果を有する。
請求項１に係る発明では、温度上昇に伴なって第１のバネ装置のバネ圧が増加して弁軸(12)を閉弁方向へ付勢する力が増大するから、弁体(11)の閉弁力低下が抑えられてシール性の低下が防止される。
請求項２に係る発明では、温度上昇に伴なって第２のバネ装置のバネ圧が増加して弁軸(12)を開方向に付勢する力が増大するから、温度上昇に基づく弁体(11)の開度低下を防止することができる。
請求項３，４に係る発明では、既述したように、温度上昇に伴なって弁体(11)の開弁度が低下するのが防止できると共に、閉弁時に於ける弁体(11)の閉弁力低下を防止することができる。 The present invention has the following specific effects.
In the invention according to claim 1, since the spring pressure of the first spring device increases as the temperature rises and the force for urging the valve shaft (12) in the valve closing direction increases, the valve element (11) Therefore, a decrease in the valve closing force is suppressed, and a decrease in sealing performance is prevented.
In the invention according to claim 2, since the spring pressure of the second spring device increases as the temperature rises and the force for urging the valve shaft (12) in the opening direction increases, the valve body based on the temperature rise (11) It is possible to prevent the opening degree from decreasing.
In the inventions according to claims 3 and 4, as described above, it is possible to prevent the valve opening degree of the valve body (11) from being lowered as the temperature rises, and the valve body (11) when the valve is closed. It is possible to prevent a decrease in the valve closing force.

以下に、本発明を実施するための最良の形態について添付図面を参照しながら説明する。
図１は本発明の実施の形態に係る弁装置をガス流路に配設した状態の断面図である。
弁箱(5)の側壁(53)には一次流路(51)が接続されていると共に、底壁(54)には二次流路(52)に繋がる弁口(50)が形成されている。
弁箱(5)内に配設された弁体(11)は、前記弁口(50)に対して接離動作するリフト弁であり、該弁体(11)は弁軸(12)の下端に取付けられている。
前記弁軸(12)の下端近傍は、弁体(11)に結合される小径軸部(120)になっていると共に、該小径軸部(120)の上方の大径フランジ部(121)には、下方閉弁バネ(14)の一端が着座している。 The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a sectional view showing a state in which a valve device according to an embodiment of the present invention is disposed in a gas flow path.
A primary channel (51) is connected to the side wall (53) of the valve box (5), and a valve port (50) connected to the secondary channel (52) is formed on the bottom wall (54). Yes.
The valve body (11) disposed in the valve box (5) is a lift valve that moves toward and away from the valve port (50), and the valve body (11) is a lower end of the valve shaft (12). Installed on.
Near the lower end of the valve shaft (12) is a small-diameter shaft portion (120) coupled to the valve body (11), and a large-diameter flange portion (121) above the small-diameter shaft portion (120). The one end of the lower valve closing spring (14) is seated.

又、上記下方閉弁バネ(14)の他端は、扁平な円錐台状に形成された第１の形状記憶部材たる下方バネ受け(15)の小径側端部(150)に着座していると共に、該下方バネ受け(15)は形状記憶部材としてのバイメタルで形成されており、温度上昇に伴って上下高さが増加するように変形する。このため、下方バネ受け(15)は、上側金属板(151)と下側金属板(152)を張り合わせた積層板で形成されていると共に、上側金属板(151)の熱膨張率は下側金属板(152)のそれよりも大きく設定されている。従って、温度上昇に伴って下方バネ受け(15)が上下高さを増大させる方向に変形した場合には、該変形分だけ下方閉弁バネ(14)の圧縮量が増加し、これにより、弁体(11)を閉弁方向に付勢する下方閉弁バネ(14)の付勢力が増加する。従って、本実施の形態では、上記下方閉弁バネ(14)と第１バネ受(15)の組合せが、既述発明特定事項たる第１のバネ装置に対応する。 The other end of the lower valve closing spring (14) is seated on the small diameter side end (150) of the lower spring receiver (15) which is a first shape memory member formed in a flat truncated cone shape. At the same time, the lower spring receiver (15) is formed of a bimetal as a shape memory member, and is deformed so that the vertical height increases as the temperature rises. For this reason, the lower spring receiver (15) is formed of a laminated plate in which the upper metal plate (151) and the lower metal plate (152) are bonded together, and the thermal expansion coefficient of the upper metal plate (151) is lower. It is set larger than that of the metal plate (152). Accordingly, when the lower spring receiver (15) is deformed in the direction of increasing the vertical height as the temperature rises, the amount of compression of the lower valve closing spring (14) increases by the amount of the deformation, and thereby the valve The biasing force of the lower valve closing spring (14) that biases the body (11) in the valve closing direction increases. Therefore, in the present embodiment, the combination of the lower valve closing spring (14) and the first spring receiver (15) corresponds to the first spring device which is the above-mentioned invention specific matter.

弁箱(5)の上端開放部は、中央に軸孔(41)が開設された閉塞蓋(4)で閉塞されていると共に、前記軸孔(41)に嵌入された上端閉塞のシリンダ(43)内には弁軸(12)の上部域が摺動自在に挿入されている。又、シリンダ(43)内を摺動する弁軸(12)の太軸部(122)は部分的（図１の斜線域）に磁化されており、これにより、軸方向に間隔をおいてＮ極域(124)とＳ極域(125)を備えた永久磁石部(126)が形成されている。尚、図１に於いて斜線を施したＮ極域(124)とＳ極域(125)の磁力の影響によって、これらから軸方向へ若干ずれた領域も多少磁化されるが、同図の斜線を施したＮ極域(124)とＳ極域(125)の領域が最も強い磁性を帯びた状態になっている。 The upper end open part of the valve box (5) is closed by a closing lid (4) having a shaft hole (41) opened at the center, and a cylinder (43) with an upper end closed inserted into the shaft hole (41). The upper region of the valve shaft (12) is slidably inserted into the bracket. In addition, the thick shaft portion (122) of the valve shaft (12) sliding in the cylinder (43) is partially magnetized (the hatched area in FIG. 1), so that N is spaced apart in the axial direction. A permanent magnet portion (126) having a polar region (124) and an S polar region (125) is formed. In FIG. 1, the region slightly deviated in the axial direction is slightly magnetized due to the magnetic force of the N pole region (124) and the S pole region (125) which are hatched. The regions of the N pole region (124) and the S pole region (125) that have been subjected to are the most strongly magnetized.

一方、形状記憶合金製のコイルバネからなる開弁バネ(19)が弁軸(12)の軸方向中央部（後述するアクチュエータ(30)の電磁コイル(38)の発生熱が伝達される領域）に外嵌されている。即ち、弁軸(12)の上部域に形成された太軸部(122)の下端に連続するテーパー状縮径部(127)に開弁バネ(19)の上端が係合していると共に、該開弁バネ(19)の下端は、閉塞蓋(4)の中央孔に貫設された軸孔(41)の周囲に形成されたバネ受け段部(410)に係合している。 On the other hand, the valve-opening spring (19) made of a shape memory alloy coil spring is provided in the axial center of the valve shaft (12) (region where heat generated by an electromagnetic coil (38) of an actuator (30) described later is transmitted). It is fitted. That is, the upper end of the valve opening spring (19) is engaged with the tapered diameter-reduced portion (127) continuous with the lower end of the thick shaft portion (122) formed in the upper region of the valve shaft (12), The lower end of the valve opening spring (19) is engaged with a spring receiving step (410) formed around a shaft hole (41) penetrating the central hole of the closing lid (4).

又、形状記憶合金製の開弁バネ(19)は、雰囲気温度の上昇に伴なって自由長が増加するように加工されていると共に、該開弁バネ(19)のバネ定数は弁軸(12)を閉弁方向に付勢する下方閉弁バネ(14)のバネ定数に比べて小さな値に設定されている。即ち、弁軸(12)に対する開弁バネ(19)のバネ圧は閉弁バネ(14)のバネ圧より弱い値に設定されている。このものでは、開弁バネ(19)が既述発明特定事項たる第２のバネ装置に対応すると共に、開弁バネ(19)を構成する形状記憶合金材料が既述発明特定事項たる第２の形状記憶部材に対応する。 The valve opening spring (19) made of shape memory alloy is processed so that the free length increases as the ambient temperature increases, and the spring constant of the valve opening spring (19) is the valve shaft ( 12) is set to a smaller value than the spring constant of the lower valve closing spring (14) that biases the valve closing direction. That is, the spring pressure of the valve opening spring (19) with respect to the valve shaft (12) is set to a value weaker than the spring pressure of the valve closing spring (14). In this structure, the valve-opening spring (19) corresponds to the second spring device which is the above-mentioned invention specific matter, and the shape memory alloy material constituting the valve-opening spring (19) is the second invention-specific matter. Corresponds to the shape memory member.

上記シリンダ(43)の側方に位置するアクチュエータ(30)は、コア(37)の外周に電磁コイル(38)を巻回したものをコ字状のヨーク(31)に収納したものであり、コア(37)やヨーク(31)は磁性材料で形成されている。
ヨーク(31)の両端は既述従来のものと同様に、サイド磁極部(34A)(36A)になっており、これらサイド磁極部(34A)(36A)の相互間にはコア(37)の一端たる中央磁極部(35A)が位置していると共に、該コア(37)の他端は前記ヨーク(31)の内面に当接している。従って、電磁コイル(38)が通電状態になると、コア(37)内に形成される磁力線が、該コア(37)とヨーク(31)の当接部→該ヨーク(31)内→ヨーク(31)の両端のサイド磁極部(34A)(36A)→弁軸(12)内の経路で延びるように形成される。 The actuator (30) located on the side of the cylinder (43) is one in which an electromagnetic coil (38) is wound around the outer periphery of the core (37) and stored in a U-shaped yoke (31). The core (37) and the yoke (31) are made of a magnetic material.
Both ends of the yoke (31) are side magnetic pole portions (34A) (36A) as in the conventional one described above, and the core (37) is interposed between these side magnetic pole portions (34A) (36A). The central magnetic pole part (35A) as one end is located, and the other end of the core (37) is in contact with the inner surface of the yoke (31). Accordingly, when the electromagnetic coil (38) is energized, the lines of magnetic force formed in the core (37) are changed from the contact portion between the core (37) and the yoke (31) → the inside of the yoke (31) → the yoke (31 ) Are formed so as to extend along a path in the side magnetic pole portions (34A) (36A) → the valve shaft (12) at both ends.

本実施の形態では、電磁コイル(38)に通電させたときには、ヨーク(31)両端のサイド磁極部(34A)(36A)がＳ極になる一方、コア(37)の一端の中央磁極部(35A)がＮ極になるように設定されていると共に、一方のサイド磁極部(34A)と中央磁極部(35A)との間隔（他方のサイド磁極部(36A)と中央磁極部(35A)の間隔も同じ）は、図１に於いて、弁軸(12)上に斜線を施した領域たるＮ極域(124)の軸方向中心部とＳ極域(125)の軸方向中心部との間隔と等しくなるように寸法設定されている。 In the present embodiment, when the electromagnetic coil (38) is energized, the side magnetic pole portions (34A) (36A) at both ends of the yoke (31) become S poles, while the central magnetic pole portion (at the one end of the core (37) ( 35A) is set to N pole, and the distance between one side magnetic pole part (34A) and the central magnetic pole part (35A) (the other side magnetic pole part (36A) and the central magnetic pole part (35A) In FIG. 1, the distance between the axial center of the N pole region (124) and the axial center of the S pole region (125) is a hatched area on the valve shaft (12) in FIG. The dimensions are set to be equal to the interval.

又、上記アクチュエータ(30)は、非磁性材料から成るカバー(45)で覆われていると共に、シリンダ(43)に於けるアクチュエータ(30)の反対側の外壁面には、側板(46)が添設されている。尚、側板(46)は、本実施の形態では磁性体で形成されているが、非磁性体であってもよい。 The actuator (30) is covered with a cover (45) made of a nonmagnetic material, and a side plate (46) is provided on the outer wall surface of the cylinder (43) opposite to the actuator (30). It is attached. The side plate (46) is formed of a magnetic material in the present embodiment, but may be a non-magnetic material.

次に、上記弁装置の動作を説明する。
図１は、電磁コイル(38)に通電しない閉弁状態を示しており、この状態では電磁コイル(38)が非通電状態にあることから、アクチュエータ(30)の各磁極(34A)(35A)(36A)は磁化されていない。
この状態では、弁軸(12)のＮ極域(124)→ヨーク(31)のサイド磁極部(36A)→ヨーク(31)内→コア(37)内→コア(37)の中央磁極部(35A)→弁軸(12)のＳ極域(125)→弁軸(12)のＮ極域(124)と循環する閉じた磁路で磁力線が形成される。これにより、永久磁石部(126)のＳ極域(125)とＮ極域(124)が中央磁極部(35A)と一方のサイド磁極部(36A)の対向位置に維持され、これにより、永久磁石部(126)と上記中央磁極部(35A)及びサイド磁極部(36A)との磁気吸着力が弁体(11)を閉弁状態に維持する力（閉弁力）として作用する。又、弁軸(12)の先端近傍に設けられた下方閉弁バネ(14)の付勢力も弁体(11)の閉弁力として作用し、前記磁気吸着力及び下方閉弁バネ(14)の付勢力の合力によって、弁体(11)が閉弁状態に維持される。尚、本実施の形態では、温度が高くない状態では、永久磁石部(126)と中央磁極部(35A)及びサイド磁極部(36A)との磁気吸着力だけで弁体(11)を確実に閉弁状態に維持するのに必要な閉弁付勢力が確保できるようになっている。 Next, the operation of the valve device will be described.
FIG. 1 shows a closed state in which the electromagnetic coil (38) is not energized. In this state, since the electromagnetic coil (38) is in a non-energized state, each magnetic pole (34A) (35A) of the actuator (30). (36A) is not magnetized.
In this state, the N pole region (124) of the valve shaft (12) → the side magnetic pole part (36A) of the yoke (31) → the yoke (31) → the core (37) → the central magnetic pole part of the core (37) ( 35A) → S pole region (125) of valve shaft (12) → N pole region (124) of valve shaft (12) and a closed magnetic path circulates to form magnetic lines of force. As a result, the S pole region (125) and the N pole region (124) of the permanent magnet portion (126) are maintained at the opposed positions of the central magnetic pole portion (35A) and one of the side magnetic pole portions (36A). The magnetic attraction force between the magnet part (126), the central magnetic pole part (35A) and the side magnetic pole part (36A) acts as a force (valve closing force) for maintaining the valve element (11) in the closed state. Further, the biasing force of the lower valve closing spring (14) provided in the vicinity of the tip of the valve shaft (12) also acts as the valve closing force of the valve body (11), and the magnetic adsorption force and the lower valve closing spring (14). The valve element (11) is maintained in the closed state by the resultant force of the urging force. In the present embodiment, in a state where the temperature is not high, the valve element (11) can be reliably secured only by the magnetic attractive force between the permanent magnet part (126), the central magnetic pole part (35A) and the side magnetic pole part (36A). The valve closing biasing force necessary for maintaining the valve closed state can be secured.

この閉弁状態で外気温上昇すると、既述従来例と同様に永久磁石部(126)の磁力が弱くなり、該磁力による弁体(11)の閉弁付勢力が低下する。一方、外気温上昇に伴なって、下方バネ受け(15)が高さ増加するように変形し、これにより、下方閉弁バネ(14)の圧縮量が増加して該下方閉弁バネ(14)による閉弁付勢力が増加する。一方、外気温上昇によって、形状記憶合金製の開弁バネ(19)がその自由長を増加させようとし、これにより、弁軸(12)を上昇移動させる付勢力（開弁方向の付勢力）が増加するが、開弁バネ(19)のバネ定数は下方閉弁バネ(14)のバネ定数より低い値に設定されているから、下方閉弁バネ(14)の閉弁付勢力と開弁バネ(19)の開弁付勢力の合力は全体として閉弁付勢力として作用する。これにより、永久磁石部(126)の磁力低下に伴なう弁体(11)の閉弁付勢力の低下が防止され、全体としてみた場合、弁体(11)を閉弁状態に維持する力が低下することがない。即ち、本実施の形態に係る弁装置では、外気温上昇に伴なって永久磁石部(126)が磁力低下を来たしても、弁体(11)のシール性が低下することがない。 When the outside air temperature rises in this valve-closed state, the magnetic force of the permanent magnet portion (126) becomes weak as in the conventional example described above, and the valve-closing urging force of the valve body (11) due to the magnetic force decreases. On the other hand, as the outside air temperature rises, the lower spring receiver (15) is deformed so as to increase in height, whereby the amount of compression of the lower valve closing spring (14) increases, and the lower valve closing spring (14 ) Increases the valve closing bias force. On the other hand, the valve opening spring (19) made of shape memory alloy tries to increase the free length due to the rise in the outside air temperature, and thereby the urging force (the urging force in the valve opening direction) that moves the valve shaft (12) upward. However, since the spring constant of the valve opening spring (19) is set to a value lower than the spring constant of the lower valve closing spring (14), the valve closing biasing force and the valve opening force of the lower valve closing spring (14) are set. The resultant force of the valve opening biasing force of the spring (19) acts as a valve closing biasing force as a whole. This prevents the valve closing force of the valve body (11) from decreasing due to a decrease in the magnetic force of the permanent magnet section (126), and the force that maintains the valve body (11) in the closed state when viewed as a whole. Will not drop. That is, in the valve device according to the present embodiment, the sealing performance of the valve body (11) does not decrease even when the permanent magnet portion (126) is subjected to a decrease in magnetic force as the outside air temperature increases.

さて、外気温が高い上記条件下で、電磁コイル(38)に通電すると、図２に示すように中央磁極部(35A)がＮ極になり、サイド磁極部(34A)(36A)がＳ極になる。すると、弁軸(12)に於ける永久磁石部(126)のＳ極域(125)と、アクチュエータ(30)のヨーク(31)下端のサイド磁極部(34A)が同極であるから互いに反発する一方、上記Ｓ極域(125)とアクチュエータ(30)の中央磁極部(35A)及び、Ｎ極域(124)と上方のサイド磁極部(36A)が引き合い、これにより、弁軸(12)が上方に引き上げられて弁体(11)が弁口(50)から離反して開弁し始める。すると、一次流路(51)→弁箱(5)内→弁口(50)→二次流路(52)の経路でガスが流れ、該ガス流によって弁箱(5)内の下方バネ受け(15)が冷却され、これにより、該下方バネ受け(15)が、高さ増加する前の扁平形状に復帰する。一方、既述したように開弁バネ(19)による開弁付勢力は大きくなっているから、永久磁石部(126)とアクチュエータ(30)との磁力により、弁軸(12)が一層上昇し易くなって弁体(11)の開度が充分に大きくなる。即ち、外気温上昇に伴なって永久磁石部(126)が磁力低下を来たしても、開弁時に於ける弁体(11)の開度低下を招来しない。又、電磁コイル(38)が通電継続によって発熱し、これにより、永久磁石部(126)の磁力が低下した場合も、電磁コイル(38)からの伝達熱により開弁バネ(19)による弁体(11)の閉弁付勢力が増大するため、該弁体(11)が開度低下する心配がない。
尚、上記開弁状態で電磁コイル(38)への通電を遮断すると、アクチュエータ(30)のコア(37)やヨーク(31)が消磁状態に復帰して図１の閉弁状態に戻る。 When the electromagnetic coil (38) is energized under the above-mentioned conditions where the outside air temperature is high, the central magnetic pole part (35A) becomes N pole and the side magnetic pole parts (34A) (36A) become S pole as shown in FIG. become. Then, since the south pole region (125) of the permanent magnet portion (126) in the valve shaft (12) and the side magnetic pole portion (34A) at the lower end of the yoke (31) of the actuator (30) have the same polarity, they repel each other. On the other hand, the S pole region (125) and the central magnetic pole portion (35A) of the actuator (30) and the N pole region (124) and the upper side magnetic pole portion (36A) attract each other. Is lifted upward, and the valve element (11) is separated from the valve opening (50) and starts to open. Then, gas flows in the path of the primary flow path (51) → in the valve box (5) → the valve port (50) → the secondary flow path (52), and the gas flow causes the lower spring receiving in the valve box (5). (15) is cooled, so that the lower spring receiver (15) returns to the flat shape before the height is increased. On the other hand, since the valve opening urging force by the valve opening spring (19) is large as described above, the valve shaft (12) is further raised by the magnetic force between the permanent magnet part (126) and the actuator (30). It becomes easy and the opening degree of a valve body (11) becomes large enough. That is, even if the permanent magnet portion (126) has a decrease in magnetic force accompanying an increase in the outside air temperature, the degree of opening of the valve element (11) at the time of opening the valve is not decreased. In addition, even when the electromagnetic coil (38) generates heat due to continued energization, and the magnetic force of the permanent magnet portion (126) decreases thereby, the valve element by the valve opening spring (19) is transmitted by the heat transferred from the electromagnetic coil (38). Since the valve closing urging force of (11) is increased, there is no fear that the opening of the valve body (11) is lowered.
When the energization of the electromagnetic coil (38) is interrupted in the above-described valve open state, the core (37) and the yoke (31) of the actuator (30) return to the demagnetized state and return to the valve closed state of FIG.

［第２実施形態]
次に、本発明の第２実施形態に係る弁装置の構成を図３，図４に基づいて説明する。
第２実施形態に係る弁装置は、第１実施形態の閉弁バネ(19)に代えて、弁軸(12)を閉弁方向に付勢するバネ定数の小さな上方閉弁バネ(17)と上方バネ受け(18)の組合せを採用したものであり、該上方バネ受け(18)はアクチュエータ(30)の電磁コイル(38)の発生熱が伝達される領域、具体的には、弁軸(12)に外嵌したシリンダ(43)の上部に配設されている。その他の構成は既述第１実施形態のものと同様になっている。 [Second Embodiment]
Next, the structure of the valve apparatus which concerns on 2nd Embodiment of this invention is demonstrated based on FIG. 3, FIG.
In the valve device according to the second embodiment, instead of the valve closing spring (19) of the first embodiment, an upper valve closing spring (17) with a small spring constant that biases the valve shaft (12) in the valve closing direction; The upper spring receiver (18) is used in combination, and the upper spring receiver (18) is a region where heat generated by the electromagnetic coil (38) of the actuator (30) is transmitted, specifically, a valve shaft ( It is arranged on the upper part of the cylinder (43) fitted on 12). Other configurations are the same as those of the first embodiment described above.

上記上方閉弁バネ(17)等の配設部の構成を更に詳述すると、弁軸(12)の上端には上方閉弁バネ(17)の下端が着座していると共に、該上方閉弁バネ(17)とシリンダ(43)の頂部板(44)との間には扁平な円錐台状の既述第３の形状記憶部材たる上方バネ受け(18)が介在されている。そして、上記上方閉弁バネ(17)は前記上方バネ受け(18)の小径側端部に着座していると共に、上方バネ受け(18)は上側金属板(181)と下側金属板(182)を張り合わせた積層板（バイメタル）で形成されており、上側金属板(181)の熱膨張率は下側金属板(182)のそれよりも小さく設定されている。従って、雰囲気温度の上昇に伴なって上方バネ受け(18)が上下高さを減少させる方向（扁平化する方向）に変形する。これにより、該変形分だけ上方閉弁バネ(17)の圧縮量が低下し、弁体(11)を閉弁方向に付勢する上方閉弁バネ(17)の付勢力が減少する。従って、本実施の形態では、上記上方閉弁バネ(17)と上方バネ受け(18)の組合せが既述発明特定事項たる第３のバネ装置に対応する。 The arrangement of the upper valve closing spring (17) and the like will be described in more detail. The lower end of the upper valve closing spring (17) is seated on the upper end of the valve shaft (12). Between the spring (17) and the top plate (44) of the cylinder (43), an upper spring receiver (18) as a third shape memory member having a flat truncated cone shape is interposed. The upper valve-closing spring (17) is seated on the small-diameter end of the upper spring receiver (18), and the upper spring receiver (18) includes an upper metal plate (181) and a lower metal plate (182). ), And the thermal expansion coefficient of the upper metal plate (181) is set to be smaller than that of the lower metal plate (182). Therefore, as the ambient temperature rises, the upper spring receiver (18) is deformed in the direction of decreasing the vertical height (the direction of flattening). As a result, the amount of compression of the upper valve closing spring (17) decreases by the amount of deformation, and the urging force of the upper valve closing spring (17) that urges the valve element (11) in the valve closing direction decreases. Therefore, in the present embodiment, the combination of the upper valve closing spring (17) and the upper spring receiver (18) corresponds to the third spring device which is the above-mentioned invention specific matter.

又、上記上方閉弁バネ(17)のバネ定数は下方閉弁バネ(14)のバネ定数よりも小さな値に設定されており、これにより、弁軸(12)に作用する上方閉弁バネ(17)のバネ圧は、下方閉弁バネ(14)のバネ圧に比べて弱い値になっている。尚、後述する電磁石装置たるアクチュエータ(30)用の電磁コイル(38)の通電によって発生する熱は、シリンダ(43)を介して上方バネ受け(18)の配設部まで伝達され、これにより、上方バネ受け(18)は外気温のみならず、電磁コイル(38)の発生熱によっても扁平方向に変形する。 Further, the spring constant of the upper valve closing spring (17) is set to a value smaller than the spring constant of the lower valve closing spring (14), whereby an upper valve closing spring (acting on the valve shaft (12) ( The spring pressure of 17) is weaker than the spring pressure of the lower valve closing spring (14). The heat generated by energization of an electromagnetic coil (38) for an actuator (30) which is an electromagnet device, which will be described later, is transmitted to the arrangement portion of the upper spring receiver (18) through the cylinder (43). The upper spring receiver (18) is deformed in the flat direction not only by the outside air temperature but also by the heat generated by the electromagnetic coil (38).

このものでは、図３に示す閉弁状態で外気温が上昇すると、既述のように永久磁石部(126)の磁力が弱くなり、該磁力による弁体(11)の閉弁付勢力が低下する。一方、外気温上昇に伴なって、下方バネ受け(15)が高さ増加するように変形し、これにより、既述第１実施形態と同様に下方閉弁バネ(14)の圧縮量が増加して該下方閉弁バネ(14)による閉弁付勢力が増加する。これとは逆に、外気温上昇によって上方バネ受け(18)は扁平化するように変形し、これにより、上方閉弁バネ(17)の圧縮量が低下して該上方閉弁バネ(17)による弁体(11)の閉弁付勢力が低下するが、該上方閉弁バネ(17)のバネ定数は下方閉弁バネ(14)のそれよりも小さく設定されているから、下方閉弁バネ(14)と上方閉弁バネ(17)の閉弁付勢力の合力は前記外気温上昇に伴なって増加する。これにより、永久磁石部(126)の磁力低下に伴なう弁体(11)の閉弁付勢力の低下が防止され、全体としてみた場合、弁体(11)を閉弁状態に維持する力が低下することがない。即ち、本実施の形態に係る弁装置では、外気温上昇に伴なって永久磁石部(126)が磁力低下を来たしても、弁体(11)のシール性が低下することがない。 In this case, when the outside air temperature rises in the valve closing state shown in FIG. 3, the magnetic force of the permanent magnet portion (126) becomes weak as described above, and the valve closing biasing force of the valve body (11) due to the magnetic force decreases. To do. On the other hand, as the outside air temperature rises, the lower spring receiver (15) is deformed so as to increase in height, thereby increasing the amount of compression of the lower valve closing spring (14) as in the first embodiment. Thus, the valve closing biasing force by the lower valve closing spring (14) increases. On the contrary, the upper spring receiver (18) is deformed so as to be flattened due to an increase in the outside air temperature, thereby reducing the amount of compression of the upper valve closing spring (17), and the upper valve closing spring (17). The valve closing biasing force of the valve body (11) due to the lowering is reduced, but the spring constant of the upper valve closing spring (17) is set smaller than that of the lower valve closing spring (14). The resultant force of the valve closing biasing force of (14) and the upper valve closing spring (17) increases as the outside air temperature rises. This prevents the valve closing force of the valve body (11) from decreasing due to a decrease in the magnetic force of the permanent magnet section (126), and the force that maintains the valve body (11) in the closed state when viewed as a whole. Will not drop. That is, in the valve device according to the present embodiment, the sealing performance of the valve body (11) does not decrease even when the permanent magnet portion (126) is subjected to a decrease in magnetic force as the outside air temperature increases.

外気温が高い上記条件下で、電磁コイル(38)に通電すると、第１実施形態で説明したように弁体(11)が弁口(50)から離反して開弁し始め、これにより、弁箱(5)内に発生するガス流で下方バネ受け(15)が冷却され、該下方バネ受け(15)が、高さ増加する前の扁平形状に復帰する。一方、上方バネ受け(18)は既述したように扁平化したままの状態（上方閉弁バネ(17)の付勢力が低下した状態）にあるから、永久磁石部(126)とアクチュエータ(30)との磁力により、弁軸(12)が上昇し易くなって弁体(11)の開度が充分に大きくなる。即ち、外気温上昇に伴なって永久磁石部(126)が磁力低下を来たしても、開弁時に於ける弁体(11)の開度低下を招来しない。又、電磁コイル(38)が通電継続によって発熱し、これにより、永久磁石部(126)の磁力が低下した場合も、電磁コイル(38)からの伝達熱で上方バネ受け(18)が扁平形状に変形するから、上方閉弁バネ(17)の付勢力が低下し、弁体(11)が開弁し易くなるため、弁体(11)が開度低下する心配がない。 When the electromagnetic coil (38) is energized under the above-mentioned conditions where the outside air temperature is high, the valve body (11) begins to open away from the valve port (50) as described in the first embodiment, The lower spring receiver (15) is cooled by the gas flow generated in the valve box (5), and the lower spring receiver (15) returns to the flat shape before the height is increased. On the other hand, since the upper spring receiver (18) is in a flattened state (a state in which the urging force of the upper valve closing spring (17) is reduced) as described above, the permanent magnet portion (126) and the actuator (30 ), The valve shaft (12) is easily raised, and the opening of the valve body (11) is sufficiently increased. That is, even if the permanent magnet portion (126) has a decrease in magnetic force accompanying an increase in the outside air temperature, the degree of opening of the valve element (11) at the time of opening the valve is not decreased. In addition, even when the electromagnetic coil (38) generates heat due to continued energization, and the magnetic force of the permanent magnet section (126) decreases, the upper spring receiver (18) is flattened by the heat transferred from the electromagnetic coil (38). Therefore, the urging force of the upper valve closing spring (17) is reduced, and the valve body (11) is easy to open, so there is no fear that the valve body (11) is lowered in opening degree.

［第３実施形態]
図５は、弁軸(12)に対して直径方向に形成した貫通孔(H)に第１，第２永久磁石(128)(129)を、相互の極性が逆になる姿勢に装填したものである。このものでも、アクチュエータ(30)の一方のサイド磁極部(34A)、中央磁極部(35A)及び他方のサイド磁極部(36A)側に第１永久磁石(128)のＳ極と第２永久磁石(129)のＮ極が対向しているから、既述した第１，第２実施形態のものと同様に、アクチュエータ(30)と弁軸(12)の永久磁石部の間に作用する磁気的な力によって弁軸(12)が軸方向に移動し、これにより、弁体(11)が開閉する。そして、このものでも、弁箱(5)内に設けられた下方バネ受け(15)とシリンダ(43)上部に設けられた上方バネ受け(18)の機能によって、既述第２実施形態と同様の作用・効果が得られる。 [Third Embodiment]
FIG. 5 shows a through hole (H) formed in a diametrical direction with respect to the valve shaft (12), in which the first and second permanent magnets (128) and (129) are loaded in a posture in which the polarities are opposite to each other. It is. Even in this case, the S pole of the first permanent magnet (128) and the second permanent magnet on the side magnetic pole part (34A), the central magnetic pole part (35A) and the other side magnetic pole part (36A) of the actuator (30). Since the N poles of (129) are opposed to each other, the magnetic force acting between the actuator (30) and the permanent magnet portion of the valve shaft (12) is the same as in the first and second embodiments described above. The valve shaft (12) moves in the axial direction due to a strong force, thereby opening and closing the valve body (11). In this case as well, the functions of the lower spring receiver (15) provided in the valve box (5) and the upper spring receiver (18) provided on the cylinder (43) are the same as those of the second embodiment. The following effects can be obtained.

［その他]
１．第１実施形態の形状記憶合金製のコイルバネからなる開弁バネ(19)に代えて、下方バネ受け(15)と下方閉弁バネ(14)の組合せと同様の構造を採用してもよい。
２．第１実施形態の永久磁石部(126)に代えて図５の第１，第２永久磁石(128)(129)を適用できることは言うまでもない。
３．第２実施形態の下方バネ受け(15)及び下方閉弁バネ(14)の組合せや、上方バネ受け(18)及び上方閉弁バネ(17)の組合せに代えて、温度上昇に伴なって自由長が長くなる形状記憶合金製のコイルバネを採用してもよい。
４．上下のバネ受け(15)(14)に代えて、温度変化によって長さが変化するワックスペレット式のシリンダ装置を使用してもよい。 [Others]
1. Instead of the valve opening spring (19) made of a coil spring made of shape memory alloy according to the first embodiment, a structure similar to the combination of the lower spring receiver (15) and the lower valve closing spring (14) may be adopted.
2. It goes without saying that the first and second permanent magnets 128 and 129 of FIG. 5 can be applied in place of the permanent magnet portion 126 of the first embodiment.
3. Instead of the combination of the lower spring receiver (15) and the lower valve closing spring (14) of the second embodiment, or the combination of the upper spring receiver (18) and the upper valve closing spring (17), it is free as the temperature rises. You may employ | adopt the coil spring made from a shape memory alloy from which length becomes long.
4). Instead of the upper and lower spring receivers (15) and (14), a wax pellet type cylinder device whose length changes with temperature changes may be used.

本発明の第１実施形態に係る弁装置の閉弁状態の断面図Sectional drawing of the valve closing state of the valve apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る弁装置の開弁状態の断面図Sectional drawing of the valve opening state of the valve apparatus which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る弁装置の閉弁状態の断面図Sectional drawing of the valve closing state of the valve apparatus which concerns on 2nd Embodiment of this invention 本発明の第２実施形態に係る弁装置の開弁状態の断面図Sectional drawing of the valve opening state of the valve apparatus which concerns on 2nd Embodiment of this invention 本発明の第３実施形態に係る弁装置の断面図Sectional drawing of the valve apparatus which concerns on 3rd Embodiment of this invention. 従来例の説明図Illustration of conventional example

符号の説明Explanation of symbols

(11)・・・弁体
(12)・・・弁軸
(14)・・・下方閉弁バネ
(15)・・・下方バネ受け
(17)・・・上方閉弁バネ
(18)・・・上方バネ受け
(19)・・・開弁バネ
(126)・・・永久磁石部
(11) ・・・ Valve
(12) ・・・ Valve shaft
(14) ・・・ Lower valve closing spring
(15) ・・・ Lower spring support
(17) ・・・ Upper valve closing spring
(18) ・・・ Upper spring support
(19) ・・・ Valve opening spring
(126) ... Permanent magnet section

Claims

軸方向に往復移動して弁体(11)を開閉させる弁軸(12)と、
前記弁軸(12)に設けられた永久磁石部と、
前記永久磁石部との間で作用する磁力の前記軸方向成分によって前記弁軸(12)を前記往復移動させる電磁石装置と、を具備するリニアアクチュエータ式の弁装置に於いて、
前記弁体(11)を閉弁させる方向の軸方向付勢力をバネ圧として前記弁軸(12)に作用させる為の第１のバネ装置を備え、
前記第１のバネ装置は、温度上昇に伴なって前記バネ圧を増加させるように形状変化する第１の形状記憶部材を具備する、リニアアクチュエータ式の弁装置。 A valve shaft (12) for reciprocating in the axial direction to open and close the valve body (11);
A permanent magnet provided on the valve stem (12);
In the linear actuator type valve device, comprising: an electromagnet device that reciprocally moves the valve shaft (12) by the axial component of the magnetic force acting between the permanent magnet portions.
A first spring device for causing the valve shaft (12) to act on the valve shaft (12) as an axial biasing force in a direction in which the valve body (11) is closed;
The first spring device is a linear actuator type valve device including a first shape memory member whose shape changes so as to increase the spring pressure as the temperature rises.

軸方向に往復移動して弁体(11)を開閉させる弁軸(12)と、
前記弁軸(12)に設けられた永久磁石部と、
前記永久磁石部との間で作用する磁力の前記軸方向成分によって前記弁軸(12)を前記往復移動させる電磁石装置と、を具備するリニアアクチュエータ式の弁装置に於いて、
前記弁体(11)を開弁させる方向の軸方向付勢力をバネ圧として前記弁軸(12)に作用させる為の第２のバネ装置を備え、
前記第２のバネ装置は、温度上昇に伴なって前記バネ圧を増加させるように形状変化する第２の形状記憶部材を具備する、リニアアクチュエータ式の弁装置。 A valve shaft (12) for reciprocating in the axial direction to open and close the valve body (11);
A permanent magnet provided on the valve stem (12);
In the linear actuator type valve device, comprising: an electromagnet device that reciprocally moves the valve shaft (12) by the axial component of the magnetic force acting between the permanent magnet portions.
A second spring device for causing the valve shaft (12) to act on the valve shaft (12) as an axial biasing force in a direction to open the valve body (11);
The second spring device is a linear actuator valve device including a second shape memory member whose shape changes so as to increase the spring pressure as the temperature rises.

請求項１の構成に対して、請求項２の構成を組み合わせた構成とし、
前記第１の形状記憶部材は、前記弁体(11)で開閉される弁口を具備する流路に設けられており、
前記第２の形状記憶部材は、前記電磁石装置への通電に基づく発生熱が伝達される領域に配設され、
前記第２のバネ装置は前記第１のバネ装置より弱いバネ圧に設定されている、リニアアクチュエータ式の弁装置。 The configuration of claim 1 is combined with the configuration of claim 2,
The first shape memory member is provided in a flow path having a valve opening opened and closed by the valve body (11),
The second shape memory member is disposed in a region where generated heat based on energization to the electromagnet device is transmitted,
The linear actuator type valve device, wherein the second spring device is set to a spring pressure weaker than that of the first spring device.

軸方向に往復移動して弁体(11)を開閉させる弁軸(12)と、
前記弁軸(12)に設けられた永久磁石部と、
前記永久磁石部との間で作用する磁力の前記軸方向成分によって前記弁軸(12)を前記往復移動させる電磁石装置と、を具備するリニアアクチュエータ式の弁装置に於いて、
前記弁体(11)を閉弁させる方向の軸方向付勢力をバネ圧として前記弁軸(12)に作用させる為の第１のバネ装置と第３のバネ装置を備え、
前記第１のバネ装置は、温度上昇に伴なって前記バネ圧を増加させるように形状変化する第１の形状記憶部材を具備しており、前記第３のバネ装置は、温度上昇に伴なって前記バネ圧を低減させるように形状変化する第３の形状記憶部材を具備し、
前記第１の形状記憶部材は、前記弁体(11)で開閉される弁口を具備する流路に設けられており、
前記第３の形状記憶部材は、前記電磁石装置への通電に基づく発生熱が伝達される領域に配設され、
前記第３のバネ装置は前記第１のバネ装置より弱いバネ圧に設定されている、リニアアクチュエータ式の弁装置。 A valve shaft (12) for reciprocating in the axial direction to open and close the valve body (11);
A permanent magnet provided on the valve stem (12);
In the linear actuator type valve device, comprising: an electromagnet device that reciprocally moves the valve shaft (12) by the axial component of the magnetic force acting between the permanent magnet portions.
A first spring device and a third spring device for causing the valve shaft (12) to act on the valve shaft (12) as an axial biasing force in a direction in which the valve body (11) is closed;
The first spring device includes a first shape memory member that changes in shape so as to increase the spring pressure as the temperature rises, and the third spring device accompanies a rise in temperature. A third shape memory member that changes its shape so as to reduce the spring pressure.
The first shape memory member is provided in a flow path having a valve opening opened and closed by the valve body (11),
The third shape memory member is disposed in a region where heat generated based on energization to the electromagnet device is transmitted,
A linear actuator type valve device in which the third spring device is set to have a weaker spring pressure than the first spring device.