JP2011137509A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve device less susceptible to the influence of fluid pressure and excellent in terms of the energy required to drive a valve body and in terms of response. <P>SOLUTION: A valve device 1 is configured so that the inside of a tubular body section 310 having a coil 33 wound thereon of a coil bobbin 31 is utilized as a flow path 10, and so that a movable body 7, which is provided with a permanent magnet body 72, is disposed as the valve body within the flow path 10. Further, a stationary body 2 comprises as a pressing member a magnetic body 25 which presses the movable body 7 toward a fluid outlet 12 to close the fluid outlet 12 by an end of the movable body 7. Further, the movable body 7 is separated from the fluid outlet 12 by propulsion force which acts on the movable body 7 when an electric current is conducted to the coil 33 with the fluid outlet 12 closed, and as a result, the fluid outlet 12 is opened. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a valve device that opens and closes a flow path by a valve body.

  As a valve device for controlling the flow of various fluids, a valve device that drives a valve body by electromagnetic force is known (see Patent Document 1).

  The valve device described in Patent Document 1 is provided with a valve chamber in which a diaphragm as a valve body is disposed on the side opposite to the side on which the actuator is disposed, and the flow path is opened and closed by displacing the diaphragm. Is doing. Further, in the valve device described in Patent Document 1, the diaphragm is reciprocated in both directions by using the attractive force of an electromagnet.

JP 2007-16935 A

  However, the valve device described in Patent Document 1 has the following problems. First, since the diaphragm is configured to receive a fluid pressure, there is a problem that the diaphragm is easily influenced by the fluid pressure. Further, when the diaphragm is displaced, there is a problem that a large amount of energy is required because the diaphragm needs to be largely deformed. Further, since the diaphragm is reciprocated in both directions using the attractive force of the electromagnet, a large thrust cannot be obtained, and there is a problem that the response is low.

  In view of the above problems, an object of the present invention is to provide a valve device that is not easily affected by fluid pressure and that is excellent in terms of energy and responsiveness required for driving a valve element.

  In order to solve the above-described problems, the present invention provides a fixed body having a movable body having a permanent magnet, a fixed body having a coil for driving the movable body on an outer peripheral side of the permanent magnet, and a fluid inlet and a fluid outlet. A valve device that opens and closes the flow path by controlling energization to the coil, and the movable body opens and closes the flow path in the flow path. Arranged as a valve body, the fixed body includes a coil bobbin in which the inside of the cylindrical body around which the coil is wound is the flow path, an opening direction in which the flow path is opened, and the flow path is closed. And an urging member that urges the movable body toward at least one of the closing directions to be in a state.

  In this invention, the inside of the cylindrical trunk | drum by which the coil was wound in the coil bobbin is utilized as a flow path, and the movable body provided with the permanent magnet is arrange | positioned as a valve body in this flow path. Therefore, unlike the case of using a diaphragm, the movable body having a small cross-sectional area is configured to receive the fluid pressure, and thus has an advantage of being hardly affected by the fluid pressure. Further, unlike the case where a diaphragm is used, it is sufficient to displace the movable body as the valve body, and the opening and closing can be performed with a small amount of energy because there is no need to deform the valve body. Further, since the coil is fed and the movable body is driven by the Lorentz force at that time, a large thrust can be obtained efficiently, so that the response is excellent. Furthermore, since the movable body is biased in at least one of the opening direction and the closing direction by the biasing member, the biasing force of the biasing member is used to open and close the flow path using the movable body. There is an advantage that you can.

  In the present invention, the biasing member is configured to bias the movable body in the closing direction, for example. According to such a configuration, the urging force of the urging member acts to urge the movable body in the closing direction, so that even when a power supply stop state such as a power failure occurs, the flow path is reliably closed. Can do.

  In the present invention, the movable body is biased by the biasing member to close the fluid outlet, and when the coil is energized in the closed state, the movable body is moved by the thrust acting on the movable body. The fluid outlet is opened after being separated from the fluid outlet, and when the energization to the coil is stopped, it is urged by the urging member so that the movable body closes the fluid outlet and the fluid outlet is closed. It is preferable that That is, when switching from the open state to the closed state, it is preferable not to energize the coil, to stop energizing the coil, and to displace the movable body in the closing direction by the urging force of the urging member. If comprised in this way, the electricity supply control to a coil can be simplified. Further, when the power supply is stopped, the flow path can be blocked by the urging force of the urging member, so that it is possible to avoid a situation where the fluid continues to flow carelessly. For this reason, when handling dangerous fluids, such as a flammable fluid, there exists an advantage that safety is high.

  In the present invention, as the urging member, a magnetic body that generates a magnetic attractive force between the permanent magnet, an electromagnet that generates a magnetic attractive force between the permanent magnet, a spring, and the like can be used. As the urging member, it is preferable to use a magnetic body that generates a magnetic attractive force between the movable body and the permanent magnet on the side where the fluid outlet is located. According to this configuration, the movable body can be urged in the closing direction with a simple configuration. If the magnetic attractive force between the movable body and the urging member is used, the urging force squares the distance between the movable body and the urging member, contrary to the case where a spring is used as the urging member. . Accordingly, since the distance between the movable body and the urging member becomes shortest when the movable body closes the fluid outlet, the urging force (magnetic attraction force) can be maximized. Further, if the movable body moves in a direction away from the fluid outlet, the distance between the movable body and the urging member becomes longer, so that the urging force (magnetic attraction force) can be reduced. Therefore, the energy for moving the movable body in the opening direction can be reduced, and the valve device can be downsized.

  In this case, the magnetic body generates a magnetic attractive force between the magnetic body and the permanent magnet via a part of the fixed body or a part of the movable body interposed between the magnetic body and the permanent magnet. It is preferable. If comprised in this way, when a permanent magnet and a magnetic body approach, it can avoid that the magnetic attraction force which acts between a permanent magnet and a magnetic body becomes excessive. Therefore, when shifting from the closed state to the open state, there is an advantage that only a relatively small current needs to be supplied to the coil. Further, since the permanent magnet and the magnetic body are separated in the process in which the permanent magnet and the magnetic body are close to each other and in the process in which the permanent magnet and the magnetic body are separated from each other, the magnetic force acting between the permanent magnet and the magnetic body is reduced. It is also possible to suppress a sudden change in the suction force. For this reason, when a permanent magnet and a magnetic body approach, a movable body moves to a closed position with appropriate speed. Further, when the permanent magnet and the magnetic body are separated from each other, the movable body moves at an appropriate and stable speed in the opening direction without abruptly changing the balance between the drag force by the biasing member and the Lorentz force. .

  In the present invention, the fixed body may include a cylindrical yoke that covers the outer peripheral side of the coil, and the magnetic body may be fixed to the yoke. If comprised in this way, the leakage of the magnetic flux from the permanent magnet provided in the movable body can be prevented with the yoke and the magnetic body. In addition, since the magnetic path is constituted by the yoke and the magnetic body, the adsorption of the movable body by the magnetic body can be stabilized. Furthermore, if it is the structure which fixes a magnetic body to a yoke, a magnetic body can be fixed by caulking or spot welding. Furthermore, if the magnetic body and the yoke are fixed, the strength of the fixed body can be improved.

  In the present invention, the fluid inlet is provided on a side of the flow path opposite to the side where the fluid outlet is located with respect to the movable body, and the fluid inlet flows into the fluid inlet when the fluid outlet is in an open state. It is preferable that the fluid flows out from the fluid outlet through between the outer peripheral surface of the movable body and the inner peripheral surface of the cylindrical body. If comprised in this way, fluid pressure will be added to the direction which displaces a movable body to a close direction. Therefore, when the configuration in which the fluid outlet is closed by the movable body is adopted, the fluid pressure acts as a back pressure against the movable body, so that the closing ability is large even when the fluid pressure on the inflow side is high.

  In the present invention, it is preferable that the fluid outlet is configured as a tubular member separate from the coil bobbin. If comprised in this way, the precision of the dimension of a fluid outlet can be obtained compared with the case where a fluid outlet is comprised as a part of coil bobbin.

  In the present invention, the permanent magnet includes a plurality of magnet pieces arranged along a driving direction of the movable body, and a magnetic plate disposed between adjacent magnet pieces in the plurality of magnet pieces, A plurality of the coils are arranged along the driving direction of the movable body, and the adjacent magnet pieces have the same poles facing the other magnet piece, and the adjacent coils in the plurality of coils. It is preferable that the winding directions are opposite to each other. If comprised in this way, since a permanent magnet efficiently forms the magnetic field linked to a coil, there exists an advantage that a big thrust can be obtained.

  In the present invention, in a state where the flow path is closed, the magnetic plate is opposed to a central portion in the driving direction of the coil located on the outer peripheral side of the magnetic plate, and the movable range of the movable body is The magnetic plate is preferably set within a range from a position facing the central portion of the coil to a position facing the end of the coil. That is, the movable range of the movable body is preferably set within a range in which the magnetic plate does not move to a position facing a coil different from the coil facing the magnetic plate in a state where the flow path is closed. The state in which the magnetic plate is opposed to the central portion in the coil driving direction is the state where the thrust by the Lorentz force is maximized, so if this state is closed, the urging force from the urging member is applied to the movable body. Even when the maximum voltage is applied in the closed state, the movable body can be reliably moved in the opening direction. Further, if the movable range of the movable body is set to the above range, it is possible to prevent the direction of thrust due to the Lorentz force from being reversed during the movement of the movable body.

  In this invention, the inside of the cylindrical trunk | drum by which the coil was wound in the coil bobbin is utilized as a flow path, and the movable body provided with the permanent magnet is arrange | positioned as a valve body in this flow path. Therefore, unlike the case of using a diaphragm, the movable body having a small cross-sectional area is configured to receive the fluid pressure, and thus has an advantage of being hardly affected by the fluid pressure. Further, unlike the case where a diaphragm is used, it is sufficient to displace the movable body as the valve body, and the valve body can be opened and closed with a small amount of energy because there is no need to greatly deform the valve body. Further, since the coil is fed and the movable body is driven by the Lorentz force at that time, a large thrust can be obtained efficiently, so that the response is excellent. Furthermore, since the movable body is biased in at least one of the opening direction and the closing direction by the biasing member, the biasing force of the biasing member is used to open and close the flow path using the movable body. There is an advantage that you can.

It is a perspective view which shows the external appearance of the valve apparatus to which this invention is applied. It is a disassembled perspective view of the valve apparatus to which this invention is applied. It is a disassembled perspective view of the movable body used for the valve apparatus to which this invention is applied. It is explanatory drawing which shows the magnetic structure etc. of the valve apparatus to which this invention is applied. It is explanatory drawing which shows the opening / closing operation | movement of the valve apparatus to which this invention is applied. It is explanatory drawing which shows the force added to a movable body when performing opening / closing operation | movement in the valve apparatus to which this invention is applied. It is explanatory drawing of the fluid outlet comprised in the valve apparatus which concerns on another form of this invention. It is explanatory drawing which shows a mode that the protrusion for guide was provided in the fixing body in the valve apparatus which concerns on another form of this invention. It is explanatory drawing at the time of using a spring as a biasing member in the valve apparatus which concerns on another form of this invention. It is explanatory drawing of the magnetic drive mechanism comprised in the valve apparatus which concerns on another form of this invention.

  A mode for carrying out the present invention will be described with reference to the drawings. In the following description, one side in the axial direction is an opening direction in which the movable body is separated from the fluid outlet and opens the fluid outlet, and the other side in the axial direction is a closing direction in which the movable body closes the fluid outlet.

[overall structure]
1 and 2 are a perspective view showing an external appearance of a valve device to which the present invention is applied, and an exploded perspective view thereof. FIG. 3 is an exploded perspective view of a movable body used in a valve device to which the present invention is applied, and FIGS. 3A and 3B are exploded perspective views in which the movable body is exploded into a case and a permanent magnet body. It is a disassembled perspective view which shows a mode that the movable body was disassembled further finely.

  The valve device 1 shown in FIGS. 1, 2, and 3 has a shape extending as a whole as a whole, and an inflow pipe 14 provided on the other side from an inflow pipe 13 provided on one side in the axial direction L. To control the flow of fluid to. In this embodiment, the valve device 1 can be used to control the flow of gas or liquid as a fluid. In this embodiment, the valve device 1 is used to control the flow of liquid. Such a valve device 1 is generally composed of a fixed body 2 extending in the axis L direction with a length dimension larger than the diameter dimension, and a movable body 7 provided inside the fixed body 2 so as to be movable in the axial direction L. The movable body 7 is used as a valve body.

(Detailed configuration of fixed body 2)
FIG. 4 is an explanatory diagram showing a magnetic configuration and the like of the valve device 1 to which the present invention is applied. FIGS. 4 (a), (b), (c), and (d) show the configuration on the fixed body 2 side. It is sectional drawing shown, explanatory drawing which shows the connection state of the coil 33 used for the fixed body 2, explanatory drawing which shows another connection state of the coil 33, and sectional drawing which shows the structure by the side of the movable body 7. FIG. FIG. 5 is an explanatory view showing the opening / closing operation of the valve device 1 to which the present invention is applied. FIGS. 5 (a) and 5 (b) are explanatory views showing a state in which the fluid outlet 12 is closed by the movable body 7. FIG. 5 is an explanatory view showing a state in which the movable body 7 is separated from the fluid outlet 12 and opened.

  As shown in FIG. 2, FIG. 4A and FIG. 5, the fixed body 2 includes a cylindrical yoke 4 used as a case, a cylindrical coil bobbin 31 mounted inside the yoke 4, and a coil bobbin 31. It is fixed to the yoke 4 so as to hold the non-magnetic tubular member 23 attached to the other end portion via an O-ring-shaped rubber packing 21 and the other end portion of the coil bobbin 31. Disc-shaped magnetic body 25. The coil bobbin 31 is made of resin. In the fixed body 2, a coil 33 is wound around the coil bobbin 31, and the coil bobbin 31 and the coil 33 constitute the coil wound body 3. The coil winding body 3 (the coil 33 and the coil bobbin 31) and the yoke 4 constitute a stator 5.

  The coil bobbin 31 includes a cylindrical body portion 310 that extends in the axial direction L, and six flange portions 32 (flange portions 321 to 326) that increase in diameter on the outer peripheral surface of the cylindrical body portion 310. In this embodiment, the cylindrical body portion 310 is cylindrical, and the flange portion 32 is annular. In the coil bobbin 31, the five spaces sandwiched between the six flange portions 32 are used as coil winding portions around which the coil 33 is wound. Of the five coil winding parts, two coil winding parts located on both sides in the axial direction L have the same dimension in the axial direction L, but three coil windings located inside the axial direction L. The dimension in the axial direction L is smaller than the portion. The three coil winding portions located inside the axial direction L have the same dimension in the axial direction L. Therefore, of the five coils 33 (coils 331 to 335) wound around the five coil winding portions, the two coils 331 and 335 wound around the coil winding portions on both sides in the axial direction L are: Although the number of turns is equal to each other, the number of turns is smaller than that of the three coils 332 to 334 wound around the coil winding portion inside the axial direction L. Note that the three coils 332 to 334 located inside the axial direction L have the same number of turns.

  A U-shaped groove 320 for positioning the coil 33 is formed on the outer peripheral portion of the flange portion 32. The groove 320 is formed when the coil 33 passes through a coil winding portion adjacent in the axial direction L. In addition to being used as a coil passing portion, it is also used as a catching portion when the winding direction of the coil 33 is reversed. The depth and width dimensions of the groove 320 are preferably set to be equal to or larger than the outer diameter dimension of the coil 33. If such a configuration is adopted, there is an advantage that the coil 33 does not protrude from the flange portion 32.

  Of the six flange portions 32, the flange portion 321 located on the other side in the axial direction L is formed thicker than the other flange portions 322 to 326. Terminal portions 34 and 35 for holding two terminals 38 and 39, respectively, are formed at locations opposite to each other.

  Here, as for the five coils 33 wound around the coil bobbin 31, the winding directions of the adjacent coils 33 are opposite to each other. The five coils 33 are electrically connected in series to the two terminals 38 and 39, for example, as shown in FIG. Or as shown in FIG.4 (c), the three coils 332-324 located inside the axial direction L are electrically connected in parallel, and the coil of the both sides of the axial direction L is connected with respect to those connection parts. A configuration in which 331 and 335 are electrically connected in series may be employed.

  2, 4 (a), and 5 again, the inside of the tubular body 310 of the coil bobbin 31 is used as the flow path 10, and the coil bobbin 31 has an end on one side of the coil winding part. Accordingly, a stepped portion 318 whose diameter is reduced toward the other side in the axial direction L and an inflow pipe 13 having a smaller diameter than the cylindrical body 310 are formed in this order. As shown in FIGS. 4A and 5, a fluid inlet 11 communicating with the flow path 10 is formed inside the inflow pipe 13. Inside the coil bobbin 31, projecting portions 37 are formed at a plurality of locations in the circumferential direction at one end of the flow path 10, and the projecting portions 37 are formed on the one side in the axial direction L of the movable body 7. It functions as a stopper when displaced in the (opening direction), and in this state, the fluid that has flowed in from the inflow pipe 13 flows into the flow path 10 through between the protrusions 37. That is, the projecting portion 37 functions as a stopper that blocks the fluid inlet 11 and stops the fluid flow when the movable body 7 is displaced to one side (opening direction) in the axial direction L.

  The other end of the coil bobbin 31 is an opening having the same inner diameter as the inner diameter of the coil bobbin 31, and a tubular member 23 is attached to the end via a rubber packing 21.

  The tubular member 23 includes a disk-shaped flange portion 231 and an outflow pipe 14 that rises from the center of the flange portion 231 toward the other side in the axial direction L. The tubular member 23 includes a flange portion 231 and a flange portion 231. An opening 230 is formed so as to penetrate the outflow pipe 14 in the axial direction L. In the tubular member 23, as shown in FIG. 4A, one end of the opening 230 is a fluid outlet 12 that communicates with the flow path 10. In this embodiment, the opening size of the fluid outlet 12 is set smaller than the opening size of the fluid inlet 11. In the tubular member 23, an annular recess 236 is formed around the fluid outlet 12 on the lower surface side of the flange portion 231, and the opening edge of the fluid outlet 12 is formed on the annular protrusion 235 by forming the annular recess 236. It has become. For this reason, there is an advantage that when the fluid outlet 12 is closed by a flat end portion of the movable body 7 described later, the fluid outlet 12 can be reliably closed. Further, when the fluid outlet 12 is closed by the flat end of the movable body 7, the load applied to the movable body 7 is reduced by an amount corresponding to the reduction in the opening size of the fluid outlet 12 and the peripheral length of the outer peripheral edge of the fluid outlet 12. There is an advantage that you can.

  In the tubular member 23, an annular step 233 is formed on the outer peripheral side of the lower surface of the flange portion 231. The annular step 233 is related to the annular step 313 formed in the opening of the coil bobbin 31. In combination, the tubular member 23 functions as a positioning portion that defines the position in the axial direction L of the tubular member 23, and prevents the tubular member 23 from moving toward one side in the axial direction L.

  As shown in FIG. 2, a hole 250 through which the outflow pipe 14 passes is formed at the center of the magnetic body 25, and the outer peripheral portion of the magnetic body 25 protrudes radially outward at four locations in the circumferential direction. A connecting portion 253 is formed, and a region sandwiched between connecting portions 253 adjacent in the circumferential direction is a small diameter portion 255. On the other hand, notches 41 are formed at four positions in the circumferential direction on the opening edge of the other end of the yoke 4, and the connecting portions 253 of the magnetic body 25 are fitted into the notches 41. ing. For this reason, the magnetic body 25 can be positioned in the circumferential direction. At the opening edge of the yoke 4, arcuate protruding plate portions 42 protruding in the axial direction L are formed at four locations sandwiched by the four notches 41, and the protruding plate portion 42 is bent inward in the radial direction. The outer peripheral surface of the small diameter portion 255 of the magnetic body 25 is brought into contact with the inner peripheral surface of the circular arc portion.

  The coil bobbin 31 in which the coil 33 is wound around the inside of the yoke 4 when the magnetic body 25 is fixed to the end of the yoke 4 using the connecting portion 253, the small diameter portion 255, the notch 41 and the protruding plate portion 42. , The rubber packing 21 is fitted to the annular step 313 formed at the end of the coil bobbin 31, and the annular step 233 of the flange 213 of the tubular member 23 is overlaid on the annular step 313 of the coil bobbin 31 in this state. Keep it. In addition, the movable body 7 is arranged inside the coil bobbin 31. When the magnetic body 25 is overlapped on the end of the yoke 4 and fixed to the end of the yoke 4 by a method such as caulking, spot welding, or adhesion, the rubber packing 21 is attached to the opening edge of the coil bobbin 31. It deform | transforms between the flange parts 231 of the tubular member 23, and liquid-tightness is ensured. In this manner, in this embodiment, the flange portion 231 of the tubular member 23 is held between the magnetic body 25 and the coil bobbin 31, and between the outer peripheral portion of the flange portion 231 and the inner peripheral surface of the opening portion of the coil bobbin 31. A structure in which is sealed with a rubber packing 21 is employed. In addition, when ensuring liquid-tight with the rubber packing 21, the structure sealed in a radial direction other than the structure sealed in an axial direction can also be employ | adopted.

  Of the four notches 41 formed in the yoke 4, the two notches facing each other have a length dimension in the axial direction L that is considerably larger than the thickness dimension of the magnetic body 25. The provided terminal blocks 34 and 35 can be pulled out through the notch 41.

(Configuration of movable body 7)
2, 3, 4 (d) and 5, the movable body 7 has a shaft shape extending in the axial direction L with a length dimension larger than the diameter dimension, and the outer diameter dimension of the movable body 7 is The inner diameter of the cylindrical body 310 of the coil bobbin 31 is slightly smaller. The outer peripheral surface of the movable body 7 is made of a stainless steel (SUS304) pipe 71, and a permanent magnet body 72 extending in the axial direction L is accommodated inside the pipe 71. In this embodiment, each of the permanent magnet bodies 72 is disposed between four columnar magnet pieces 73 (magnet pieces 731 to 734 / permanent magnets) arranged in the axial direction L and the magnet pieces 73 adjacent in the axial direction L. Three disc-shaped magnetic plates 74 (magnetic plates 742 to 744) arranged, and two disc-shaped magnetic plates 74 arranged at both ends in the axial direction L of the permanent magnet body 72 ( Magnetic plates 741 and 745), and the magnet pieces 73 (magnet pieces 731 to 734) and the magnetic plates 74 (magnetic plates 741 to 745) have the same outer diameter. Here, the three disk-shaped magnetic plates 742 to 744 arranged between the magnet pieces 73 have the same thickness, but are thicker than the magnetic plates 741 and 745 arranged at both ends. The dimensions are large. The two disk-shaped magnetic plates 741 and 745 arranged at both ends have the same thickness.

  Further, plate-like spacers 76 and 77 made of stainless steel (SUS304) are disposed at both ends of the permanent magnet body 72 in the axial direction L, respectively. In order to form the movable body 7 by integrating the plate spacers 76 and 77, the magnet piece 73, and the magnetic plate 74 with the pipe 71, the plate spacer 76, the magnetic plate 745, and the magnet piece 734 are arranged inside the pipe 71. After arranging the magnetic plate 744, the magnet piece 733, the magnetic plate 743, the magnet piece 732, the magnetic plate 742, the magnet piece 731, the magnetic plate 741, and the plate-like spacer 77 in order, the both ends of the pipe 71 are arranged inside. The movable body 7 is configured by crimping. According to such a configuration, the fluid does not contact the magnet piece 73 even though it contacts the stainless steel (SUS304) pipe 71 and the plate-like spacers 76 and 77. Note that the pipe 71 and the plate-like spacers 76 and 77 may have a structure in which rust prevention when in contact with fluid and surface treatment or coating for preventing metal ions from flowing out are applied. Good. The pipe 71 and the plate-like spacers 76 and 77 may be made of resin.

  In this embodiment, the movable body 7 is used as a valve body that opens and closes the fluid outlet 12. For this reason, in the movable body 7, a circular rubber sheet 70 is attached to the other end portion in the axial direction L by a method such as adhesion, and the rubber sheet 70 is connected to the fluid outlet 12 as will be described later. Is closed, the fluid outlet 12 is brought into contact with the opening edge (the protruding portion 235) of the fluid outlet 12, and the fluid outlet 12 is closed.

  In the permanent magnet body 72 of the movable body 7 configured as described above, the adjacent magnet pieces 73 have the same poles facing the other magnet piece 73. For this reason, in the permanent magnet body 72, the lines of magnetic force are concentrated from the location where the magnetic plate 74 is located. As shown in FIG. 5, the coil 33 wound around the coil bobbin 31 faces the outer peripheral side of the movable body 7 via the cylindrical body portion 310 of the coil bobbin 31. In this state, the substantially central portion in the axial direction L of the coil 33 is at a position facing the both ends of the magnet body 72 used for the permanent magnet body 72 on the outer peripheral side. In other words, the magnetic plate 74 used for the permanent magnet body 72 is in a state facing the substantially central portion of the coil 33 in the axial direction L, and the permanent magnet body 72 efficiently generates a magnetic field interlinked with the coil 33. Will be generated.

  In particular, in this embodiment, the dimensions in the axial direction L of the two coils 331 and 335 wound at both ends in the axial direction L are the dimensions in the axial direction L of the three coils 332 to 334 wound inside the axial direction L. Shorter than that. More specifically, the dimensions in the axial direction L of the two coils 331 and 335 wound at both ends in the axial direction L are set in the axial direction L of the three coils 332 to 334 wound inside the axial direction L. The size is ½ times the size. For this reason, in the permanent magnet body 72, the magnet pieces 731 and 734 located on both sides in the axial direction L are made shorter in the axial direction L than the magnet pieces 732 and 733 located inside the axial direction L. The dimension of the magnet pieces 731 and 734 in the axial direction L is ½ times the dimension of the magnet pieces 732 and 733 in the axial direction L. For this reason, as for all the five coils 33, the approximate center part of the axial direction L is located in the location where the magnetic force line concentrates in the permanent magnet body 72. In this embodiment, the dimensions of the coil 33 and the magnet piece 73 located at both ends in the axial direction L are made shorter than the dimensions of the coil 33 and the magnet piece 73 located inside the axial direction L. In spite of the fact that the overall length is shorter than that in the case of the dimensions, substantially the same thrust can be obtained.

  In this embodiment, the fixed body 2 is provided with a magnetic body 25 on the other side (closed direction) in the axial direction L with respect to the movable body 7, and the permanent magnet body 72 and the magnetic body 25 of the movable body 7 The movable body 7 is always biased to the other side (the closing direction) in the axial direction L by the magnetic attractive force acting in between. Here, between the permanent magnet body 72 of the movable body 7 and the magnetic body 25, the flange portion 231 of the tubular member 23 as a part of the fixed body 2, and the rubber sheet 70 as a part of the movable body 7, Intervenes.

(Operation)
FIG. 6 is an explanatory diagram showing the force applied to the movable body 7 when performing the opening / closing operation in the valve device 1 to which the present invention is applied, and FIGS. 6 (a), (b), and (c) are in the closed state. It is explanatory drawing, the explanatory view at the time of transfering from a closed state to an open state, and the explanatory view at the time of changing from an open state to a closed state. FIG. 6 schematically shows the force applied to the movable body 7, and therefore the shape and the like of each member are simplified.

  As shown in FIGS. 5A and 6A, in the valve device 1 of the present embodiment, the movable body 7 is positioned on the other side in the axial direction L, and the fluid outlet 12 is connected to the rubber sheet 70 of the movable body 7. The closed state is a closed state (blocking state). In this state, as shown in FIG. 6A, the movable body 7 includes a magnetic attractive force (indicated by an arrow F1) between the magnetic body 25 and the permanent magnet body 72 of the movable body 7, and a fluid. A back pressure (indicated by arrow F3) resulting from the pressure is acting. Therefore, even when the coil 33 is not energized, the closed state shown in FIGS. 6A and 5A is maintained. Here, between the permanent magnet body 72 and the magnetic body 25 of the movable body 7, a flange portion of the tubular member 23 as a part of the fixed body 2 and a rubber sheet 70 as a part of the movable body 7 are provided. Intervene. Therefore, the permanent magnet body 72 of the movable body 7 and the magnetic body 25 are not in direct contact, and the tubular member 23 as a part of the fixed body 2 is between the permanent magnet body 72 of the movable body 7 and the magnetic body 25. The flange portion 231 and the rubber sheet 70 as a part of the movable body 7 are in contact with each other.

  Next, when the coil 33 is energized in the state shown in FIGS. 5A and 6A, the movable body 7 is caused to move to one side in the axial direction L by Lorentz force as shown in FIG. 6B. A thrust (indicated by an arrow F2) toward (open direction) is applied. Accordingly, the movable body 7 is displaced to one side in the axial direction L against the magnetic attraction force and back pressure between the magnetic body 25 and the permanent magnet body 72 of the movable body 7, and as a result, FIG. As shown in FIG. 6B, the rubber sheet 70 of the movable body 7 is separated from the fluid outlet 12. Such a state is an open state. In such an open state, one end portion of the movable body 7 abuts on or abuts the projecting portion 37 formed in the coil bobbin 31 (flow path 10), as shown in FIG. It becomes an open state without being balanced and stops. In this state, the fluid that has flowed in from the inflow pipe 13 passes between the fluid inlet 11 and the protruding portion 37, as indicated by an arrow LL, and the flow path 10 (the outer peripheral surface of the movable body 7 and the cylindrical body of the coil bobbin 31). Between the outlet 310 and the fluid outlet 12.

  Next, when energization to the coil 33 is stopped in the state shown in FIGS. 5B and 6B, the movable body 7 includes the magnetic body 25 and the movable body as shown in FIG. 6C. A magnetic attractive force (shown by an arrow F1) and a back pressure (shown by an arrow F3) due to fluid pressure act between the permanent magnet body 72 and the seventh permanent magnet body 72. Accordingly, the movable body 7 is displaced to the other side in the axial direction L, and as shown in FIGS. 5A and 6A, the rubber sheet 70 of the movable body 7 closes the fluid outlet 12 ( Return to the shut-off state. Therefore, the fluid flow is interrupted.

(Main effects of this form)
As described above, in the valve device 1 of the present embodiment, the inner side of the cylindrical body 310 around which the coil 33 is wound in the coil bobbin 31 is used as the flow path 10, and the permanent magnet body 72 is provided in the flow path 10. The movable body 7 provided with is arranged as a valve body. Further, the fixed body 2 includes a magnetic body 25 that urges the movable body 7 toward the fluid outlet 12 and closes the fluid outlet 12 at the end (rubber sheet 70) of the movable body 7 as an urging member. . Further, the movable body 7 is separated from the fluid outlet 12 by the thrust acting on the movable body 7 when the coil 33 is energized in the closed state, and the fluid outlet 12 is opened. Therefore, unlike the case where a diaphragm is used, the movable body 7 having a small cross-sectional area is configured to receive the fluid pressure, so that it has an excellent closing ability when a high pressure or a negative pressure is applied. It is hard to receive. Further, unlike the case of using a diaphragm, the movable body 7 as a valve body may be displaced, and can be opened and closed with a small amount of energy because there is no need to deform the valve body. Furthermore, when the state shifts from the closed state to the open state, power is supplied to the coil 33, and the movable body 7 is driven by the Lorentz force at that time. For this reason, since a large thrust can be obtained efficiently, the response is excellent.

  In addition, since the movable body 7 is biased in the closing direction by the magnetic body 25 (biasing member), there is an advantage that the movable body 7 automatically switches to the closed state when the power supply is stopped such as a power failure in the open state. is there. Therefore, it is possible to avoid a situation where the fluid keeps flowing unintentionally, and there is an advantage that the safety is high when handling a dangerous fluid such as a flammable fluid as the fluid.

  Further, when the movable body 7 is displaced from the open position to the closed position, a current in the opposite direction to that when the movable body 7 is displaced from the closed position to the open position may be supplied to the coil 33. The energization to 33 is stopped, and the movable body 7 is displaced to the closed position by the urging force of the magnetic body 25. For this reason, the energization control to the coil 33 can be simplified.

  In addition, as the biasing member, an electromagnet that generates a magnetic attractive force between the permanent magnet body 72, a spring, and the like can be used. In this embodiment, the biasing member is a fluid with respect to the movable body 7. Since the magnetic body 25 that generates a magnetic attractive force between the permanent magnet body 72 and the permanent magnet body 72 is used on the side where the outlet 12 is located, the movable body 7 can be urged in the closing direction with a simple configuration. Further, since the magnetic attractive force between the permanent magnet body 72 provided on the movable body 7 and the magnetic body 25 (biasing member) is used, the biasing force is opposite to the case where a spring is used as the biasing member. Is squared to the distance between the permanent magnet 72 of the movable body 7 and the magnetic body 25 (biasing member). Therefore, since the distance between the movable body 7 and the magnetic body 25 is the shortest in a state where the movable body 7 closes the fluid outlet 12, the urging force (magnetic attraction force) can be maximized. Further, if the movable body 7 moves in a direction away from the fluid outlet 12, the distance between the movable body 7 and the magnetic body 25 becomes longer, so that the urging force (magnetic attraction force) can be reduced. Therefore, energy when moving the movable body 7 in the opening direction can be reduced, and the valve device 1 can be downsized.

  In addition, since the magnetic body 25 is provided outside the flow path 10, the magnetic body 25 does not contact the fluid. For this reason, compared with the case where the magnetic body 25 is provided inside the flow path 10, the pressure loss in the flow path 10 can be reduced. In addition, since the magnetic body 25 does not come into contact with the fluid, the magnetic body 25 is not affected by the fluid even if the magnetic body 25 is not subjected to surface treatment or coating for rust prevention or the like.

  In this embodiment, between the permanent magnet body 72 and the magnetic body 25 of the movable body 7, the flange portion 231 of the tubular member 23 as a part of the fixed body 2 and the rubber as a part of the movable body 7. Since the sheet 70 is interposed and the flange portion 231 and the rubber sheet 70 come into contact with each other, the flow path 10 can be reliably closed. Further, since the rubber sheet 70 is interposed, the impact noise can be absorbed when the movable body 7 comes into contact, and the operation sound can be reduced.

  Furthermore, since the permanent magnet body 72 of the movable body 7 and the magnetic body 25 are not in direct contact with each other, it is possible to avoid an excessive magnetic attractive force acting between the permanent magnet body 72 and the magnetic body 25. And a prescribed closing force can be obtained. Therefore, there is an advantage that only a relatively small current needs to be supplied to the coil 33 when shifting from the closed state to the open state. Further, in the process in which the permanent magnet body 72 and the magnetic body 25 of the movable body 7 approach each other and in the process in which the permanent magnet body 72 and the magnetic body 25 of the movable body 7 are separated from each other, the permanent magnet body 72 and the magnetic body 25 It is also possible to suppress a sudden change in the magnetic attractive force acting between them. For this reason, when the permanent magnet body 72 and the magnetic body 25 approach, the movable body 7 moves to a closed position with an appropriate speed. In addition, when the permanent magnet body 72 and the magnetic body 25 are separated from each other, the movable body 25 opens in the opening direction without abruptly changing the balance between the drag force caused by the urging force acting between the magnetic body 25 and the Lorentz force. It will move at an appropriate and stable speed.

  In the present embodiment, the fixed body 2 includes a cylindrical yoke 4 that covers the outer peripheral side of the coil 33, and the magnetic body 25 is fixed to the yoke 4. For this reason, the leakage of magnetic flux from the permanent magnet body provided on the movable body 7 can be prevented by the yoke 4 and the magnetic body 25. Further, since the magnetic path is constituted by the yoke 4 and the magnetic body 25, the adsorption of the movable body 7 by the magnetic body 25 can be stabilized. Furthermore, if it is the structure which fixes the magnetic body 25 to the yoke 4, the magnetic body 25 can be fixed by caulking or spot welding. Furthermore, if the magnetic body 25 and the yoke 4 are fixed, the strength of the fixed body 2 can be improved.

  Furthermore, in this embodiment, the fluid inlet 11 is provided on the opposite side of the flow path 10 from the side where the fluid outlet 12 is located with respect to the movable body 7, and when the fluid outlet 12 is opened, the fluid inlet 11 The inflowing fluid flows out from the fluid outlet 12 through the space between the outer peripheral surface of the movable body 7 and the inner peripheral surface of the cylindrical body portion 310 of the coil bobbin 31. For this reason, the fluid pressure is applied to the movable body 7 as a back pressure in a direction in which the movable body 7 is displaced in the closing direction. Therefore, even when a configuration in which the fluid outlet 12 is closed by the movable body 7 is used in handling a high-pressure fluid, the fluid pressure acts as a back pressure against the movable body 7, so even if the fluid pressure on the inflow side is high. The closing ability with respect to the fluid outlet 12 is large.

  Furthermore, the fluid outlet 12 is configured as a tubular member 23 that is separate from the coil bobbin 31. For this reason, compared with the case where the fluid outlet 12 is comprised as a part of coil bobbin 31, the precision of the dimension of the fluid outlet 12 can be obtained. That is, when the coil bobbin 31 is manufactured by resin molding, if the fluid outlet 12 is formed at the same time, the accuracy of the opening size of the fluid outlet 12 may be reduced due to the shrinkage of the resin or the like. Since the outlet 12 is formed in the tubular member 23 that is separate from the coil bobbin 31, high accuracy can be obtained in the dimensions of the fluid outlet 12 without being affected by the molding accuracy. Therefore, the flow path pressure loss on the outer periphery of the movable body 7 can be reliably set to be smaller than the pressure loss at the fluid outlet 12.

  Further, in this embodiment, the permanent magnet body 72 is disposed between a plurality of magnet pieces 73 (permanent magnets) arranged along the driving direction of the movable body 7 and the magnet pieces 73 adjacent to each other in the plurality of magnet pieces 73. The adjacent magnet pieces 73 have the same poles facing the other magnet piece 73. For this reason, since the permanent magnet body 72 efficiently forms a magnetic field interlinking with the coil 33, there is an advantage that a large thrust can be obtained.

  Further, in a state where the flow path 10 is closed, the magnetic plate 74 on the movable body 7 side faces the central portion in the driving direction of the coil 33 located on the outer peripheral side of the magnetic plate 74, and this state is the Lorentz This is the state where the thrust by force is maximized. For this reason, even when the urging force by the magnetic body 25 is applied to the movable body 7 so as to be maximized in the closed state, the movable body 7 can be reliably moved in the opening direction. The movable range of the movable body 7 is set within a range from a position where the magnetic plate 74 faces the central portion of the coil 33 to a position where the magnetic plate 74 faces the end of the coil 33. That is, the movable range of the movable body 7 is set within a range in which the magnetic plate 74 does not move to a position facing a coil different from the coil 33 facing the magnetic plate 74 in a state where the flow path 10 is closed. Accordingly, it is possible to prevent the direction of the thrust due to the Lorentz force from being reversed in the process of energizing the coil 33 and moving the movable body 7.

[Another embodiment 1]
FIG. 7 is an explanatory view of the fluid outlet 12 configured in the valve device 1 according to another embodiment of the present invention, and FIGS. 7A and 7B show an orifice 120 attached to the opening of the tubular member 23. FIG. It is explanatory drawing which shows a mode, and explanatory drawing which shows a mode before attaching the orifice 120 to the opening part of the tubular member. In addition, since the fundamental part of this form is the same as that of the form demonstrated with reference to FIGS. 1-6, it attaches and shows the same code | symbol to a common part, and abbreviate | omits those description .

  As described with reference to FIG. 5 and the like, in the above-described form, the fluid outlet 12 is configured by the opening that penetrates the tubular member 23 in the axial direction L. However, as shown in FIG. The fluid outlet 12 may be constituted by a stainless steel orifice 120. More specifically, as shown in FIGS. 7A and 7B, an orifice 120 made of a thin tube is mounted in an opening 230 penetrating the tubular member 23 in the axial direction L, and the end of the orifice 120 is attached. You may comprise the fluid outlet 12 by a part. According to this configuration, it is possible to obtain higher accuracy due to the size of the fluid outlet 12. Also in this case, if the end of the orifice 120 is slightly protruded from the tubular member 23, the fluid outlet 12 can be reliably closed by the rubber sheet 70 of the movable body 7.

[Another embodiment 2]
FIG. 8 is an explanatory view showing a state in which a guide projection is provided on the fixed body 2 in the valve device 1 according to another embodiment of the present invention. In addition, since the fundamental part of this form is the same as that of the form demonstrated with reference to FIGS. 1-6, it attaches and shows the same code | symbol to a common part, and abbreviate | omits those description .

  As shown in FIG. 8, on the inner peripheral surface of the cylindrical body portion 310 of the coil bobbin 31 used in this embodiment, there are a plurality of protrusions 311 that protrude inward in the radial direction and extend in the axial direction L. The protrusion 311 is configured to support the outer peripheral surface of the movable body 7 described with reference to FIG. Therefore, the movable body 7 can be prevented from tilting, and the flow path 10 through which the fluid passes between the inner peripheral surface of the cylindrical body 310 of the coil bobbin 31 and the outer peripheral surface of the movable body 7 is sufficiently wide. It can be secured by a cross-sectional area.

[Another embodiment 3]
FIG. 9 is an explanatory view when a spring is used as the biasing member in the valve device 1 according to another embodiment of the present invention. In addition, since the fundamental part of this form is the same as that of the form demonstrated with reference to FIGS. 1-6, it attaches and shows the same code | symbol to a common part, and abbreviate | omits those description .

  In the form described with reference to FIGS. 1 to 6, a magnetic body that generates a magnetic attractive force between the permanent magnet body 72 of the movable body 7 as a biasing member that biases the movable body 7 in the closing direction. 9, as shown in FIG. 9, in this embodiment, a spring 26 made of a coil spring is provided as an urging member between the other end of the movable body 7 and the bottom of the coil bobbin 31. The movable body 7 is urged in the closing direction. In this case, a magnetic attractive force acting between the permanent magnet body 72 and the magnetic body 25 of the movable body 7 may be used in combination with the biasing force of the spring 26. In addition, as shown in FIG. 9, the movable body 7 may be urged in the closing direction only by the urging force of the spring 26 using a cap 29 made of a nonmagnetic material instead of the magnetic body 25.

[Another embodiment 4]
FIG. 10 is an explanatory diagram of a magnetic drive mechanism configured in a valve device 1 according to another embodiment of the present invention. In addition, since the fundamental part of this form is the same as that of the form demonstrated with reference to FIGS. 1-6, it attaches and shows the same code | symbol to a common part, and abbreviate | omits those description .

  Although the four magnet pieces 73 and the five coils 33 are used in the form described with reference to FIGS. 1 to 6, the number of the magnet pieces 73 and the coils 33 is not limited to the above form. For example, FIG. As shown in FIG. 2, two magnet pieces 73 and three coils 33 may be used.

[Other embodiments]
In the said embodiment, the magnetic body 25 and the spring 26 which generate | occur | produce a magnetic attraction force between the permanent magnet bodies 72 of the movable body 7 were illustrated as a biasing member which biases the movable body 7 in the closing direction. However, a magnet such as an electromagnet or a permanent magnet may be arranged on one side or the other side in the axial direction L with respect to the movable body 7, and the movable body 7 may be biased in the closing direction by the electromagnet or the permanent magnet. In this case, when an electromagnet is used as the urging member, the magnetic attraction force generated between the iron core used for the electromagnet and the permanent magnet body 72 of the movable body 7 when the power supply is stopped, such as a power failure. Can be used. Furthermore, by using two or more biasing members made of a magnetic body 25, a spring 26, and an electromagnet or a permanent magnet, such as a combination of a magnet such as an electromagnet or a permanent magnet and the magnetic body 25, one kind of attachment is provided. The biasing force that is insufficient with the biasing member may be compensated.

  In the above embodiment, the fluid inlet 11 and the fluid outlet 12 are provided on both sides of the movable body 7 in the axial direction L. However, the fluid inlet 11 and the fluid outlet 12 are provided on one side of the movable body 7 in the axial direction L. In this case, when the movable body 7 is driven to one side in the axial direction L, only the fluid outlet 12 side may be closed by the movable body 7.

  In the above embodiment, the coil bobbin 31 and the movable body 7 are configured to have a circular cross section, but the coil bobbin 31 and the movable body 7 may be configured to have a rectangular cross section.

  In the above embodiment, the movable body 7 is urged in the closing direction by the urging member such as the magnetic body 25 and the spring 26. However, the movable body 7 may be urged in the opening direction by the urging member. In such a configuration, the flow path 10 is held in an open state when power supply is stopped due to a power failure or the like. Further, biasing members such as the magnetic body 25 and the spring 26 are provided in both the closing direction and the opening direction of the movable body 7, and the movable body 7 is biased in the closing direction by one of the biasing members. A configuration may be adopted in which the movable body 7 is urged in the opening direction by the other urging member. In the case of such a configuration, the flow path 10 can be held in a closed state while the power supply to the coil 33 is stopped, and the flow path 10 can be held in an open state.

DESCRIPTION OF SYMBOLS 1 Valve apparatus 2 Fixed body 7 Movable body 10 Flow path 11 Fluid inlet 12 Fluid outlet 25 Magnetic body (biasing member)
26 Spring (biasing member)
31 Coil bobbin 33 Coil 72 Permanent magnet body 73 Magnet piece 74 Magnetic plate 310 Cylindrical trunk

Claims (10)

A movable body having a permanent magnet, a fixed body having a coil for driving the movable body on an outer peripheral side of the permanent magnet, and a flow path configured in the fixed body with a fluid inlet and a fluid outlet. , A valve device for controlling energization to the coil to open and close the flow path,
The movable body is arranged as a valve body for opening and closing the flow path in the flow path,
The fixed body includes a coil bobbin in which the inside of the cylindrical body around which the coil is wound is the flow path, an open direction in which the flow path is in an open state, and a close direction in which the flow path is in a closed state. And a biasing member that biases the movable body toward at least one of them.   The valve device according to claim 1, wherein the biasing member biases the movable body in the closing direction. The movable body is urged by the urging member to close the fluid outlet,
When the coil is energized in the closed state, the movable body is separated from the fluid outlet by the thrust acting on the movable body, and the fluid outlet is opened.
3. The valve device according to claim 2, wherein when the energization to the coil is stopped, the valve is biased by the biasing member, the movable body closes the fluid outlet, and the fluid outlet is closed. .   4. The valve device according to claim 1, wherein the biasing member is a magnetic body that generates a magnetic attraction force between the biasing member and the permanent magnet. 5.   The magnetic body generates a magnetic attractive force between the magnetic body and the permanent magnet through a part of the fixed body or a part of the movable body interposed between the magnetic body and the permanent magnet. The valve device according to claim 4. The fixed body includes a cylindrical yoke that covers an outer peripheral side of the coil,
The valve device according to claim 4 or 5, wherein the magnetic body is fixed to the yoke. The fluid inlet is provided on the side of the flow path opposite to the side where the fluid outlet is located with respect to the movable body;
When the fluid outlet is in an open state, the fluid flowing in from the fluid inlet flows out from the fluid outlet through between the outer peripheral surface of the movable body and the inner peripheral surface of the cylindrical body. The valve device according to any one of claims 1 to 6, characterized in that:   The valve device according to any one of claims 1 to 7, wherein the fluid outlet is configured as a tubular member separate from the coil bobbin. The permanent magnet includes a plurality of magnet pieces arranged along the driving direction of the movable body, and a magnetic plate disposed between adjacent magnet pieces in the plurality of magnet pieces,
A plurality of the coils are arranged along the driving direction of the movable body,
The adjacent magnet pieces are facing the same pole toward the other magnet piece,
The valve device according to any one of claims 1 to 8, wherein adjacent coils in the plurality of coils have opposite winding directions. In a state where the flow path is closed, the magnetic plate is opposed to a central portion in the driving direction of the coil located on the outer peripheral side of the magnetic plate,
The movable range of the movable body is set within a range from a position where the magnetic plate is opposed to the central portion of the coil to a position where the magnetic plate is opposed to an end of the coil in a state where the flow path is closed. The valve device according to claim 9.

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