JP2016065631A - Valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve structure capable of ensuring attenuation force to vibration while keeping a gap between a valve body and a guide.SOLUTION: A valve structure includes: a valve body 13 provided oppositely to a valve seat 12 of a housing 11, and adjusting opening of a passage between itself and the valve seat 12 through which fluid passes; a guide 14 slidably supporting the valve body 13; a shaft 16 moving the valve body 13 in an axial direction; and a shaft guide 17 slidably supporting the shaft 16. In the valve structure, one cylindrical magnet 22 making a magnetic field is provided on the inner peripheral side of the guide 14; and one cylindrical copper plate 21 comprising a non-magnetic body metal is provided on the outer peripheral side of the valve body 13, and is arranged at a position through which magnetic flux from the magnet 22 passes.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure of a valve used for plant piping or the like.

  Many valves are used in plant piping in general plants such as nuclear power, thermal power, and chemicals.

JP 2010-060074 A

  FIG. 10 (a) shows the structure of a conventional valve, and the problem of the conventional valve will be described with reference to FIG. 10 (b).

  As shown in FIG. 10A, the conventional valve is provided with a housing 11, a valve seat 12 provided in a passage through which fluid flows in the housing 11, a valve seat 12, and a valve seat 12. A valve body 13 for adjusting the opening between the valve body 13, a guide 14 for slidably supporting the valve body 13, a seal 15 for sealing between the valve body 13 and the guide 14, A shaft 16 for moving the position and a shaft guide 17 for slidably supporting the shaft 16 are provided.

  In the valve having such a structure, when the seal 15 is worn due to long-term use or the like, the damping with respect to vibration is reduced, and the valve body 13 and the shaft 16 are easily shaken. The same applies when the damping against vibration is small from the beginning. Therefore, vibration (self-excited vibration) occurs in the valve body 13 due to the influence of the fluid flow. When the vibration becomes large, the valve body 13 is worn and excessive stress is generated, so that the valve body 13 is also damaged.

  In order to secure the damping against vibration, it is conceivable to put a cushioning material (sponge etc.) in the gap between the valve body 13 and the guide 14. It gets smaller. In addition, if a cushioning material is sandwiched between the valve body 13 and the guide 14, a load is applied to open and close the valve body 13, and the function of the valve itself deteriorates.

  Thus, in order to prevent the valve body 13 and the guide 14 from coming into contact with each other when the valve body 13 is opened and closed, it is necessary to ensure the damping against vibration while maintaining the gap between the valve body 13 and the guide 14.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a valve structure capable of ensuring damping against vibration while maintaining a gap between a valve body and a guide.

The structure of the valve according to the first invention for solving the above problem is as follows.
A valve body for adjusting the opening of the passage through which the fluid passes;
A guide for slidably supporting the valve body;
A shaft for moving the valve body in the axial direction;
A shaft guide that slidably supports the shaft;
A magnet or coil for forming a magnetic field is provided on the guide or the shaft guide side,
A non-magnetic member made of a non-magnetic metal is provided on the valve body or the shaft side, and is disposed at a position where magnetic flux from the magnet or the coil passes.

  By adopting such a structure, when the valve body vibrates, an induced electromotive force is generated in the nonmagnetic member by the magnetic flux from the magnet or the coil, and an electric current flows through the nonmagnetic member due to the induced electromotive force. When the electromagnetic force is applied by this current, it acts so as to suppress the vibration of the valve body, thereby giving attenuation to the vibration.

The structure of the valve according to the second invention for solving the above problem is as follows:
In the valve structure according to the first invention,
One cylindrical magnet is provided on the inner peripheral side of the guide,
One cylindrical nonmagnetic member is provided on the outer peripheral side of the valve body.

The structure of the valve according to the third invention for solving the above problem is as follows:
In the valve structure according to the first invention,
One cylindrical magnet is provided on the outer peripheral side of the shaft guide,
One non-magnetic member having a cylindrical shape is provided on the inner peripheral side of the valve body.

The structure of the valve according to the fourth invention for solving the above problem is as follows.
In the valve structure according to the first invention,
A plurality of the magnets are provided along the circumferential direction on the inner peripheral side of the guide,
A plurality of the nonmagnetic members are provided along the circumferential direction on the outer peripheral side of the valve body, and each of the nonmagnetic members is disposed so as to face each of the magnets.

The structure of the valve according to the fifth invention for solving the above problem is as follows.
In the valve structure according to the first invention,
The guide is made of a nonmagnetic material, and the coil is provided on the outer peripheral side of the guide,
The valve element is made of a magnetic material, and one cylindrical nonmagnetic member is provided on the outer peripheral side of the valve element.

The structure of the valve according to the sixth invention for solving the above problem is as follows.
In the valve structure according to any one of the second, third, and fifth inventions,
The non-magnetic member is divided into a plurality of pieces in the axial direction.

The structure of the valve according to the seventh invention for solving the above problem is as follows.
In the valve structure according to any one of the second, third, and fifth inventions,
The non-magnetic member is divided into a plurality in the circumferential direction.

The structure of the valve according to the eighth invention for solving the above problem is as follows.
In the valve structure according to the first invention,
The shaft guide is made of a non-magnetic material, and the coil is provided on the outer peripheral side of the shaft guide,
The shaft is made of a magnetic material, and the rod-shaped nonmagnetic member is provided inside the shaft.

The structure of the valve according to the ninth invention for solving the above problem is as follows.
In the structure of the valve according to any one of the second to eighth inventions,
When the axial length of the non-magnetic member is divided into a plurality of portions in the axial direction, the total length of the non-magnetic member in the axial direction is the total length of the valve body. The length is such that the magnetic flux from the magnet or the coil always passes from the closed opening to the fully opened opening.

  ADVANTAGE OF THE INVENTION According to this invention, in the valve used for plant piping etc., damping | damping with respect to a vibration can be ensured, hold | maintaining the clearance gap between a valve body and a guide.

(A) is sectional drawing which shows the outline of an example (Example 1) of embodiment of the structure of the valve | bulb which concerns on this invention, (b) is an AA arrow directional view of (a). It is a figure explaining the effect | action and effect by the structure of the valve shown in FIG. 1, (a) is a figure explaining an induced electromotive force, (b) is a figure explaining electromagnetic force. It is sectional drawing which shows the outline of another example (Example 2) of embodiment of the structure of the valve | bulb which concerns on this invention, (a) is a figure in case a valve body exists in the position of a close side, (b ) Is a view when the valve body is in the open position. It is sectional drawing which shows the outline of another example (Example 3) of embodiment of the structure of the valve which concerns on this invention. (A) is sectional drawing which shows the outline of another example (Example 4) of embodiment of the structure of the valve which concerns on this invention, (b) is a BB arrow directional view of (a). is there. It is sectional drawing which shows the outline of another example (Example 5) of embodiment of the structure of the valve which concerns on this invention. It is a graph explaining an example of the effect by the structure of the valve shown in FIG. It is sectional drawing which shows the outline of another example (Example 6) of embodiment of the structure of the valve which concerns on this invention. It is sectional drawing which shows the outline of another example (Example 7) of embodiment of the structure of the valve which concerns on this invention. (A) is sectional drawing which shows the outline of the structure of the conventional valve, (b) is the schematic explaining the problem of the conventional valve.

  Hereinafter, some of the embodiments of the structure of the valve according to the present invention will be described with reference to FIGS.

Example 1
Fig.1 (a) is sectional drawing which shows the outline of the structure of the valve | bulb of a present Example, FIG.1 (b) is an AA arrow directional view of Fig.1 (a).

  The valve of this embodiment basically has the same structure as the conventional valve shown in FIG. Specifically, as shown in FIG. 1, a housing 11, a valve seat 12 provided in a passage through which the fluid of the housing 11 passes, and a valve seat 12 provided between the valve seat 12 and the valve seat 12. A valve body 13 for adjusting the opening degree of the passage through which the fluid passes, a guide 14 for slidably supporting the valve body 13, a seal 15 for sealing between the valve body 13 and the guide 14, and a valve body 13 has a shaft 16 for moving the position of 13 in the axial direction, and a shaft guide 17 for slidably supporting the shaft 16. Here, the longitudinal direction of the shaft 16, that is, the direction in which the valve body 13 moves is referred to as the axial direction.

  The shaft 16 has one end connected to the valve body 13 and the other end extending through the housing 11 to the outside. The shaft 16 is moved by an actuator or the like. Thereby, the opening degree between the valve seat 12 and the valve body 13 can be adjusted, and the flow volume etc. of the fluid which passes a valve can be adjusted.

  In this structure, as described above, vibration (self-excited vibration) occurs in the valve body 13 due to the influence of the fluid flow. One cylindrical copper plate 21 (nonmagnetic member) made of a magnetic metal is installed, and one cylindrical magnet 22 that forms a magnetic field is embedded on the inner peripheral side of the cylindrical guide 14. In addition, since the valve body 13 is a column shape here, the copper plate 21 is made into the cylindrical shape according to this, However, If the copper plate 21 is a cylinder shape, it changes according to the shape of the valve body 13. For example, if the valve body 13 is a quadrangular prism shape, the copper plate 21 may be formed into a square tube shape accordingly.

  Regarding the positional relationship between the copper plate 21 and the magnet 22, when the valve body 13 is in a slightly open state, the magnetic flux from the magnet 22 passes so that the copper plate 21 and the magnet 22 are in the axial position where they face each other. It arranges so that it may become a position. This is because, when the valve body 13 is in the fully opened state, the valve body 13 is hardly affected by the flow of the fluid because the entire valve body 13 is accommodated in the guide 14, and the valve body 13 is in the fully closed state. Since the fluid does not flow, the valve body 13 is not affected by the flow of the fluid. On the other hand, when the valve body 13 is in the slightly open state, the region of the valve body 13 exposed from the guide 14 is This is because it is often affected by the flow of fluid.

  By setting it as such a structure, it is set as the attenuation | damping addition structure which provides damping | damping which suppresses the vibration of the valve body 13. FIG.

  Here, with reference to FIG. 2 (a), (b), the effect | action and effect by the attenuation | damping addition structure of a present Example are demonstrated.

  When the copper plate 21 of the valve body 13 is in a position facing the magnet 22 of the guide 14, the magnetic flux from the magnet 22 passes through the copper plate 21. And if the valve body 13 vibrates and the copper plate 21 moves to the direction which approaches the magnet 2, for example, an induced electromotive force will generate | occur | produce in the copper plate 21 and an electric current will flow into the copper plate 21. FIG. At this time, a current flows through the copper plate 21 in a direction according to the Fleming right-hand rule. Here, generally, when the magnetic flux density of the magnetic field is B, the length of the copper plate is L, the moving speed of the copper plate is V, and the copper plate is moved across the direction perpendicular to the magnetic field, the induced electromotive force in the copper plate e can be obtained from the equation [e = B · L · V].

  When a current flows through the copper plate 21 due to the induced electromotive force, an electromagnetic force acts in a direction according to the Fleming left-hand rule. That is, the electromagnetic force acts in the direction opposite to the direction in which the copper plate 21 moves. As a result, this electromagnetic force acts so as to suppress the vibration of the valve body 13, and attenuation is imparted to the vibration.

  Since the magnetic flux density is large near the magnet 22, the suppression effect increases as the distance between the copper plate 21 and the magnet 22 decreases. Therefore, it is necessary to install the copper plate 21 at the location where the magnetic flux of the magnet 22 is affected. However, since the gap between the valve body 13 and the guide 14 is small due to the structure, the copper plate 21 and the magnet 22 are installed on the valve body 13 and the guide 14. To do is an effective arrangement.

  The effect of the valve structure according to the present invention will be described in detail in FIG. 7 of Example 5 to be described later as an example. The valve structure of this example also has the same effect, and the valve body 13 and the guide 14 As compared with the conventional valve structure, the damping effect for suppressing the vibration can be increased and the damping for suppressing the vibration can be ensured.

  Here, the copper plate 21 that is a diamagnetic metal is used, but other materials may be used as long as a current flows through a nonmagnetic metal, and gold, silver, or the like that is a diamagnetic metal may be used. Alternatively, paramagnetic metals such as aluminum and platinum may be used. Moreover, it may replace with the magnet 22 and may similarly be an electromagnet which forms a magnetic field.

(Example 2)
The structure of the valve of the present embodiment is basically the same as the structure of the valve of the first embodiment, but there is a difference in the structure of the copper plate provided on the valve body. Therefore, the structure equivalent to the structure of the valve of the first embodiment is denoted by the same reference numeral, and redundant description will be omitted, and the structure of the valve of the present embodiment will be described.

  Here, FIGS. 3A and 3B are cross-sectional views showing an outline of the structure of the valve of this embodiment, and FIG. 3A is a view when the valve body is in the closed position. FIG. 3B is a diagram when the valve body is in the open position. In FIG. 3, the casing 11 and the valve seat 12 shown in FIG. 1A of the first embodiment are not shown.

  In the first embodiment, the copper plate 21 is disposed so as to face the magnet 22 when the valve body 13 is in the slightly open state. On the other hand, in this embodiment, the axial length of the copper plate 23 is made longer than the copper plate 21 so that the copper plate 23 (non-magnetic member) always follows the magnet 22 even if the opening degree of the valve body 13 changes. The valve body 13 is made longer. In other words, the length of the magnetic flux from the magnet 22 always passes through the copper plate 23 from the fully open position of the valve body 13 to the fully open position.

  By having the above-described structure, the operation and effects equivalent to the effects and effects in the first embodiment are obtained, and the copper plate 23 is always in a position facing the magnet 22 even when the opening degree of the valve body 13 is changed. A damping effect for suppressing vibrations can always be obtained.

  Also here, the copper plate 23 which is a diamagnetic metal is used, but any other material may be used as long as a current flows through it, and gold, silver or the like which is a diamagnetic metal may be used. Alternatively, paramagnetic metals such as aluminum and platinum may be used. Further, instead of the magnet 22, an electromagnet may be used.

(Example 3)
The structure of the valve of the present embodiment is basically the same as the structure of the valve of the first and second embodiments, but there is a difference in the structure of the copper plate provided on the valve body. Therefore, the same structure as the valve structure of the first embodiment and the second embodiment is denoted by the same reference numeral, and a duplicate description is omitted, and the structure of the valve of the present embodiment will be described.

  Here, FIG. 4 is a cross-sectional view schematically showing the structure of the valve of this embodiment. In FIG. 4, the casing 11 and the valve seat 12 shown in FIG. 1A of the first embodiment are not shown.

  In Example 1 and Example 2, each of the copper plates 21 and 23 is composed of one cylindrical member. In contrast, in the present embodiment, a plurality of cylindrical copper plates 24 (non-magnetic members) are installed in the axial direction. In other words, the copper plates 21 and 23 are divided into a plurality of parts in the axial direction.

  By having the structure described above, the effects and effects equivalent to the effects and effects in the first and second embodiments are achieved, and as described above, a plurality of copper plates 24 are installed in the axial direction, so that some of the copper plates If the 24 is damaged, the damaged portion can be partially exchanged, so that the cost can be reduced.

  Also here, the copper plate 24 which is a diamagnetic metal is used, but other materials may be used as long as a current flows through a non-magnetic material, and gold or silver which is a diamagnetic metal may be used. Alternatively, paramagnetic metals such as aluminum and platinum may be used. Further, instead of the magnet 22, an electromagnet may be used.

Example 4
The structure of the valve of the present embodiment is also basically the same as the structure of the valves of the first and second embodiments, but is different in the structure of the copper plate provided in the valve body and the structure of the magnet provided in the guide. There is. Therefore, the same structure as the valve structure of the first embodiment and the second embodiment is denoted by the same reference numeral, and a duplicate description is omitted, and the structure of the valve of the present embodiment will be described.

  Here, Fig.5 (a) is sectional drawing which shows the outline of the structure of the valve | bulb of a present Example, FIG.5 (b) is a BB arrow directional view of Fig.5 (a). In FIG. 5, the casing 11 and the valve seat 12 shown in FIG. 1A of the first embodiment are not shown.

  In Example 1 and Example 2, each of the copper plates 21 and 23 is composed of one cylindrical member, and the magnet 22 is also composed of one cylindrical member. On the other hand, in the present embodiment, a plurality of substantially rectangular copper plates 25 (non-magnetic members) are installed in the circumferential direction along the outer periphery of the valve body 13, and the substantially rectangular magnet 26 is disposed inside the guide 14. It is the structure installed in the circumferential direction along the circumference. In other words, the copper plates 21 and 23 are divided into a plurality of pieces in the circumferential direction, and the magnet 22 is divided into a plurality of pieces in the circumferential direction.

  About arrangement | positioning of the some copper plate 25 and the some magnet 26, it arrange | positions so that each copper plate 25 and each magnet 26 may face each other in the circumferential direction.

  By having the above-described structure, the operation and effect equivalent to those of Example 1 and Example 2 are achieved, and, as described above, a plurality of copper plates 25 and magnets 26 are installed in the circumferential direction. When the copper plate 25 and the magnet 26 of the part are damaged, the damaged part can be partially replaced, so that the cost can be reduced.

  Also here, the copper plate 25 which is a diamagnetic metal is used, but other materials may be used as long as a current flows through a non-magnetic material, and gold or silver which is a diamagnetic metal may be used. Alternatively, paramagnetic metals such as aluminum and platinum may be used. In place of the magnet 26, an electromagnet may be used.

(Example 5)
The structure of the valve of the present embodiment is also basically the same as the structure of the valves of Embodiment 1 and Embodiment 2, but there are differences in the arrangement positions of the copper plate and the magnet. Therefore, the same structure as the valve structure of the first embodiment and the second embodiment is denoted by the same reference numeral, and a duplicate description is omitted, and the structure of the valve of the present embodiment will be described.

  Here, FIG. 6 is a cross-sectional view schematically showing the structure of the valve of this embodiment. In FIG. 6, the casing 11 and the valve seat 12 shown in FIG. 1A of the first embodiment are not shown.

  In Example 1 and Example 2, the copper plates 21 and 23 are each installed on the outer peripheral side of the valve body 13, and the magnet 22 is installed on the inner peripheral side of the guide. On the other hand, in this embodiment, one cylindrical copper plate 27 (non-magnetic member) is installed on the inner peripheral side of the valve body 13 and one cylindrical magnet 28 is connected to the outer peripheral side of the shaft guide 17. It is the composition installed in.

  Such a configuration is applicable when there is a space inside the valve body 13. Even in this case, the magnet 28 is installed inside the valve body 13 so that the gap with the copper plate 27 is small.

  As for the positional relationship between the copper plate 27 and the magnet 28, as in the first embodiment, when the valve body 13 is in the slightly open state, the copper plate 27 and the magnet 28 may be disposed so as to be in the axial position facing each other. As in the second embodiment, the axial length of the copper plate 27 may be increased so that the copper plate 27 always follows the magnet 28 even if the opening of the valve body 13 changes. Furthermore, a plurality of copper plates 27 may be installed in the axial direction as in the third embodiment, and a plurality of copper plates 27 and magnets 28 may be installed in the circumferential direction as in the fourth embodiment.

  By setting it as the structure mentioned above, there exists an effect | action and effect equivalent to the effect | action and effect in Example 1-4.

  Here, with reference to the graph of FIG. 7, an example of the effect by the structure of the valve of a present Example is demonstrated. In FIG. 7, the solid line graph shows the acceleration due to the valve structure of the present embodiment, and the dotted line graph shows the acceleration due to the conventional valve structure (see FIG. 10). This acceleration indicates the frequency response by the ratio of acceleration and excitation force (acceleration / excitation force), and the acceleration of the valve element 13 is measured by applying force (excitation force) by a tapping test. It is a thing.

  As is apparent from the graph of FIG. 7, the acceleration (see the solid line) due to the valve structure of the present embodiment is greatly reduced from the acceleration (see the dotted line) according to the conventional valve structure, and damping that suppresses vibrations. It turns out that the effect is great. When calculating the vibration damping ratio from these accelerations, when the damping ratio of the original valve structure is 0.1%, the damping ratio added by the valve structure of this embodiment is 2.4%. It can be seen that greater attenuation can be imparted.

  Here, the copper plate 27 that is a diamagnetic metal is also used here, but other materials may be used as long as a current flows through the current, and gold, silver, or the like that is a diamagnetic metal may be used. Alternatively, paramagnetic metals such as aluminum and platinum may be used. In place of the magnet 28, an electromagnet may be used.

(Example 6)
The structure of the valve of this embodiment is basically the same as the structure of the valves of Embodiment 1 and Embodiment 2, but there is a difference in using a coil instead of a magnet. Therefore, the same structure as the valve structure of the first embodiment and the second embodiment is denoted by the same reference numeral, and a duplicate description is omitted, and the structure of the valve of the present embodiment will be described.

  Here, FIG. 8 is a cross-sectional view schematically showing the structure of the valve of this embodiment. In FIG. 8, the casing 11 and the valve seat 12 shown in FIG. 1A of the first embodiment are not shown.

  In the first and second embodiments, a magnet 22 is installed on the inner peripheral side of the guide 14. On the other hand, in this embodiment, the coil 30 is installed on the outer peripheral side of the guide 14. Here, the guide 14 is made of a non-magnetic material, and the coil 30 is wound around the outer periphery of the guide 14. The valve body 13 is made of a magnetic material such as iron so that the magnetic flux generated by the coil 30 passes through the valve body 13. In addition, although the copper plate 23 in Example 2 is used here as a copper plate installed in the outer periphery of the valve body 13, it replaces with this and the copper plate 21 in Example 1 may be used, and also implementation. The copper plate 24 in Example 3 may be used, or the copper plate 25 in Example 4 may be used.

  By adopting the structure described above, similarly to the operation and effect in the first to fourth embodiments, when the valve body 13 vibrates, an induced electromotive force is generated in the copper plate 23 by the magnetic flux generated in the coil 30. An electric current flows through the copper plate 23 due to the induced electromotive force, and an electromagnetic force acts on the copper plate 23, so that the vibration of the valve body 13 is suppressed and the vibration is attenuated. In addition, since a magnetic flux is generated by flowing a current through the coil 30 here, the electromagnetic force can be controlled by the amount of the current flowing through the coil 30, so that the magnitude of attenuation to be added can be controlled. . For example, the magnitude of attenuation to be added may be controlled according to the opening degree of the valve body 13.

  Also here, the copper plate 23 which is a diamagnetic metal is used, but any other material may be used as long as a current flows through it, and gold, silver or the like which is a diamagnetic metal may be used. Alternatively, paramagnetic metals such as aluminum and platinum may be used.

(Example 7)
The structure of the valve of the present embodiment is basically the same as the structure of the valve of the sixth embodiment, but there are differences in the arrangement of the copper plate (here, the copper rod) and the coil. Here, the same reference numerals are given to the same components as those of the valve structures of the first and second embodiments described above, and the description of the valve of the present embodiment will be described without redundant description.

  Here, FIG. 9 is a cross-sectional view schematically showing the structure of the valve of this embodiment. In FIG. 9, the casing 11 and the valve seat 12 shown in FIG. 1A of the first embodiment are not shown.

  In the sixth embodiment, the copper plate 23 is installed on the outer peripheral side of the valve body 13, and the coil 30 is installed on the outer peripheral side of the guide 14. On the other hand, in this embodiment, one copper rod 31 (nonmagnetic member) is embedded in the shaft 16 and the coil 32 is installed on the outer peripheral side of the shaft guide 17. Here, the shaft guide 17 is made of a non-magnetic material, and a coil 32 is wound around the outer periphery of the shaft guide 17. The shaft 16 is made of a magnetic material such as iron so that the magnetic flux generated by the coil 32 passes through the shaft 16.

  With the above-described structure, similarly to the operation and effect in the sixth embodiment, when the valve body 13 vibrates, an induced electromotive force is generated in the copper rod 31 by the magnetic flux generated in the coil 32, and this induced electromotive force is generated. As a result, an electric current flows through the copper rod 31 and an electromagnetic force acts on the copper rod 31 to act to suppress the vibration of the valve body 13 and to attenuate the vibration. Again, since a magnetic flux is generated by passing a current through the coil 32, the electromagnetic force can be controlled by the amount of current flowing through the coil 32, so that the attenuation to be added can be controlled. For example, the magnitude of attenuation to be added may be controlled according to the opening degree of the valve body 13. Further, since the coil 32 is provided inside the guide 14, the coil 32 is not directly exposed to the fluid, and the life of the coil 32 can be extended.

  Also here, the copper rod 31 that is a diamagnetic metal is used, but other materials may be used as long as a current flows through a nonmagnetic material, and gold, silver, or the like that is a diamagnetic metal may be used. Alternatively, paramagnetic metals such as aluminum and platinum may be used. Further, the length of the copper bar 31 may be set such that the magnetic flux from the coil 32 always passes through the copper bar 31 from the fully closed opening of the valve body 13 to the fully opened opening.

  The present invention is suitable as a valve for plant piping used in general plants such as nuclear power, thermal power, and chemistry.

DESCRIPTION OF SYMBOLS 11 Housing | casing 12 Valve seat 13 Valve body 14 Guide 15 Seal 16 Shaft 17 Shaft guide 21, 23, 24, 25, 27 Copper plate 22, 26, 28 Magnet 30, 32 Coil 31 Copper rod

Claims (9)

A valve body for adjusting the opening of the passage through which the fluid passes;
A guide for slidably supporting the valve body;
A shaft for moving the valve body in the axial direction;
A shaft guide that slidably supports the shaft;
A magnet or coil for forming a magnetic field is provided on the guide or the shaft guide side,
A non-magnetic member made of a non-magnetic metal is provided on the valve body or the shaft side, and is arranged at a position where magnetic flux from the magnet or the coil passes. The structure of the valve according to claim 1,
One cylindrical magnet is provided on the inner peripheral side of the guide,
A valve structure characterized in that one cylindrical nonmagnetic member is provided on the outer peripheral side of the valve body. The structure of the valve according to claim 1,
One cylindrical magnet is provided on the outer peripheral side of the shaft guide,
A valve structure characterized in that one cylindrical nonmagnetic member is provided on the inner peripheral side of the valve body. The structure of the valve according to claim 1,
A plurality of the magnets are provided along the circumferential direction on the inner peripheral side of the guide,
A plurality of the non-magnetic members are provided along the circumferential direction on the outer peripheral side of the valve body, and the non-magnetic members are arranged so as to face the magnets. . The structure of the valve according to claim 1,
The guide is made of a nonmagnetic material, and the coil is provided on the outer peripheral side of the guide,
A structure of a valve, wherein the valve body is made of a magnetic material, and one cylindrical nonmagnetic member is provided on the outer peripheral side of the valve body. In the structure of the valve according to any one of claims 2, 3, and 5,
A valve structure characterized in that the non-magnetic member is divided into a plurality of pieces in the axial direction. In the structure of the valve according to any one of claims 2, 3, and 5,
A valve structure characterized in that the non-magnetic member is divided into a plurality in the circumferential direction. The structure of the valve according to claim 1,
The shaft guide is made of a non-magnetic material, and the coil is provided on the outer peripheral side of the shaft guide,
A structure of a valve, wherein the shaft is made of a magnetic material, and the rod-shaped nonmagnetic member is provided inside the shaft. In the structure of the valve according to any one of claims 2 to 8,
When the axial length of the non-magnetic member is divided into a plurality of portions in the axial direction, the total length of the non-magnetic member in the axial direction is the total length of the valve body. The valve structure is characterized in that the magnetic flux from the magnet or the coil always passes through from the closed opening to the fully opened opening.

Images