JP2014126062A - Valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve structure that is improved in precision of flow rate control.SOLUTION: A valve body 30 includes a valve part 34 which spreads in an umbrella shape from a tip face side of a plunger 13 to a seating face 43, and a valve seat 40 has a cut-shaped part formed at an end edge on an outer peripheral surface side. A face side of the valve part 34 opposed to the seating face 43 is seated on the seating face 43 while a coil is not powered so as to form in the state the valve part 34 is warped, as a seal region, an annular region, between a region where a valve hole 42 is formed and a region where a cut part is provided, in a radial direction. The valve part 34 leaves the seating face 43 as a plunger 13 moves according to an increase in power supply to the coil.

Description

  The present invention relates to a valve structure.

  Conventionally, solenoid valves have been widely used to control the flow rate and the fluid pressure associated with the flow rate. As the solenoid valve, a solenoid valve using a linear solenoid that makes the amount of current flowing to the coil proportional to the flow rate is known. A conventional solenoid valve using a linear solenoid will be described with reference to FIGS. FIG. 14 is a schematic cross-sectional view showing a state in which the valve in the vicinity of the valve portion is closed in the solenoid valve according to the conventional example. FIG. 15 is a schematic cross-sectional view showing a state in which the valve in the vicinity of the valve portion is open in the solenoid valve according to the conventional example. FIG. 16 is a graph showing the relationship between the energization amount to the coil and the flow rate in the solenoid valve according to the conventional example.

  In the solenoid valve according to this conventional example, a valve body 120 that protrudes further in the distal direction from the center of the distal end surface 110 of the rod 100 that reciprocates according to the energization amount to the coil is provided integrally with the rod 100. Yes. A rubber O-ring 300 is attached to the outer periphery of the valve body 120. The valve seat 200 is provided with a valve hole 210.

  With the above configuration, when the coil is not energized, the valve body 120 of the rod 100 enters the valve hole 210 of the valve seat 200, and the O-ring 300 is connected to the distal end surface 110 of the rod 100 and the valve seat 200. It is the state pinched | interposed between the seating surfaces 220 of this. As a result, the valve hole 210 is closed by the valve body 120 and the O-ring 300 (see FIG. 14). When the coil is energized, the rod 100 moves in a direction in which the tip surface 110 of the rod 100 is separated from the seating surface 220. As a result, the valve body portion 120 is removed from the valve hole 210 and the O-ring 300 is separated from the seating surface 220, so that the valve hole 210 is opened (see FIG. 15).

  Here, the rubber O-ring 300 has adhesiveness. In the conventional example, the O-ring 300 is sandwiched between the tip surface 110 of the rod 100 and the seat surface 220 of the valve seat 200. Therefore, immediately after the rod 100 starts to move from the state in which the valve is closed, the O-ring 300 extends slightly in the axial direction due to adhesion with the seating surface 220 and then moves away from the seating surface 220 to the original shape. To return to. In FIG. 15, an O-ring 300 a indicated by a dotted line shows a state where the O-ring 300 a extends in the axial direction due to adhesion with the seating surface 220. Therefore, as shown in the X part of the graph in FIG. 16, immediately after the start of energization, a phenomenon occurs in which the fluid flow rate increases momentarily. In FIG. 16, L1 indicates a state when the current value increases from the non-energized state, and L2 indicates a state until the current value decreases from the high current value until the non-energized state. ing. As can be seen from this graph, the flow rate is different between L1 and L2 even at the same current value. This difference in flow rate is called hysteresis, and it can be seen that the greater this hysteresis, the greater the error in flow rate for a given energization amount. As one of the causes of this hysteresis, it is considered that there is a problem of sticking of the O-ring 300 described above.

Thus, the O-ring 300 sticking to the seating surface 200 makes the flow control unstable immediately after the start of energization (immediately after the valve starts to open), and also increases the hysteresis, thereby increasing the flow rate. This is a cause of reducing the accuracy of control. In the above description, the problem regarding the valve structure in the solenoid valve has been described. However, the same applies to the valve structure in which the drive source is other than the solenoid (pneumatic actuator, hydraulic actuator, piezoelectric actuator, etc.). Problems can arise.

JP 2006-226352 A Japanese Utility Model Publication 3-29645

  The objective of this invention is providing the valve structure which aimed at the improvement of the precision of flow control.

  The present invention employs the following means in order to solve the above problems.

That is, the valve structure of the present invention is
A rubber valve body provided at the tip of a reciprocating member configured to reciprocate by a reciprocating actuator;
In a valve structure comprising: a valve seat that is closed when the valve portion of the valve body is seated on a seat surface, and is opened when the valve portion is separated from the seat surface;
The valve body includes the valve portion that expands in an umbrella shape from the front end surface side of the reciprocating member toward the seat surface,
At the edge on the outer peripheral surface side of the valve seat, a notch is formed,
In the state in which the reciprocating member is moving to the seat surface side, the surface of the valve portion facing the seat surface in the bent state is seated on the seat surface, and in the radial direction, An annular region between the region in which the valve hole is provided and the region in which the notch-like part is provided becomes a seal region, and the reciprocating member moves in a direction away from the seating surface, The valve portion is configured to be separated from the seating surface.

  In addition, regarding the “notch-shaped portion” in the present invention, a notch may be formed by cutting, or a shape portion such as a notch may be formed by other methods, and its manufacturing method is limited. Not.

  According to the present invention, when the reciprocating member moves in a direction in which the valve portion of the valve body moves away from the seat surface of the valve seat from the state in which the valve is closed, the seat was bent and seated on the seat surface. While the valve portion is deformed so as to return to its original shape, the valve portion moves away from the seating surface. Here, the valve portion in the present invention employs a configuration that expands in an umbrella shape from the tip surface side of the reciprocating member toward the seat surface. Therefore, the valve portion of the valve body according to the present invention is more easily separated from the seat surface than when it is separated from the seat surface from a state compressed from both sides as in the case of the conventional O-ring. Moreover, in this invention, the notch-shaped part is formed in the edge by the side of the outer peripheral surface of a valve seat. Accordingly, in the process of returning from the bent state to the original shape, the fluid flows through the notch from the stage before the valve portion leaves the seat surface. From the above, it is possible to stably perform fluid control immediately after the valve starts to open. Further, since the valve portion is easily separated from the seat surface, an error in flow rate control due to hysteresis can be reduced.

In addition, the other valve structure of the present invention is
A rubber valve body provided at the tip of a reciprocating member configured to reciprocate by a reciprocating actuator;
In a valve structure comprising: a valve seat that is closed when the valve portion of the valve body is seated on a seat surface, and is opened when the valve portion is separated from the seat surface;
The valve body extends in an umbrella shape from the front end surface side of the reciprocating member toward the seat surface, and
At the distal end on the outer peripheral surface side, the valve portion formed with a notch-shaped portion is provided,
In the state in which the reciprocating member is moving to the seat surface side, the surface of the valve portion facing the seat surface in the bent state is seated on the seat surface, and in the radial direction, An annular region between the region in which the valve hole is provided and the region in which the notch-like part is provided becomes a seal region, and the reciprocating member moves in a direction away from the seating surface, The valve portion is configured to be separated from the seating surface.

  In addition, regarding the “notch-shaped part” in the present invention, a notch may be formed by cutting, or a shape part such as a notch may be formed by molding, and the manufacturing method is not limited.

  According to the present invention, when the reciprocating member moves in a direction in which the valve portion of the valve body moves away from the seat surface of the valve seat from the state in which the valve is closed, the seat was bent and seated on the seat surface. While the valve portion is deformed so as to return to its original shape, the valve portion moves away from the seating surface. Here, the valve portion in the present invention employs a configuration that expands in an umbrella shape from the tip surface side of the reciprocating member toward the seat surface. Therefore, the valve portion of the valve body according to the present invention is more easily separated from the seat surface than when it is separated from the seat surface from a state compressed from both sides as in the case of the conventional O-ring. Moreover, in this invention, the notch-shaped part is formed in the front-end | tip at the outer peripheral surface side of the valve part of a valve body. Accordingly, in the process of returning from the bent state to the original shape, the fluid flows through the notch from the stage before the valve portion leaves the seat surface. From the above, it is possible to stably perform fluid control immediately after the valve starts to open. Further, since the valve portion is easily separated from the seat surface, an error in flow rate control due to hysteresis can be reduced.

Further, the valve seat is provided with a through hole inside the region where the valve hole is provided,
The valve body has a central axis common to the valve portion, and is provided with a shaft portion that is reciprocally movable in the through hole.
The outer peripheral side of the shaft portion may be supported by an annular member slidably provided on the inner peripheral surface of the through hole.

  Thereby, the position shift of the central axis with respect to the valve seat when the valve body reciprocates can be suppressed. Therefore, the accuracy of the position where the valve portion of the valve body is seated on the seat surface can be increased. Further, since the annular member that supports the outer peripheral side of the shaft portion slides with respect to the inner peripheral surface of the through hole, the valve element moves smoothly.

  As described above, according to the present invention, the accuracy of flow rate control can be improved.

FIG. 1 is a schematic cross-sectional view of a solenoid valve according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the valve body according to the first embodiment of the present invention. FIG. 3 is a front view of the valve body according to the first embodiment of the present invention. FIG. 4 is a plan view of the valve seat according to the first embodiment of the present invention. FIG. 5 is a perspective view of the valve seat according to the first embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing a state where the valve in the vicinity of the valve portion is closed in the solenoid valve according to the first embodiment of the present invention. FIG. 7 is a schematic cross-sectional view showing a state where the valve in the vicinity of the valve portion is opened in the solenoid valve according to the first embodiment of the present invention. FIG. 8 is a diagram showing a positional relationship between the seating surface and the valve portion in the solenoid valve according to the first embodiment of the present invention. FIG. 9 is a perspective view of the valve body according to the second embodiment of the present invention. FIG. 10 is a front view of the valve body according to the second embodiment of the present invention. FIG. 11 is a plan view of the valve seat according to the second embodiment of the present invention. FIG. 12 is a perspective view of a valve seat according to the second embodiment of the present invention. FIG. 13 is a diagram showing a positional relationship between the seating surface and the valve portion in the solenoid valve according to the second embodiment of the present invention. FIG. 14 is a schematic cross-sectional view showing a state in which the valve in the vicinity of the valve portion is closed in the solenoid valve according to the conventional example. FIG. 15 is a schematic cross-sectional view showing a state in which the valve in the vicinity of the valve portion is open in the solenoid valve according to the conventional example. FIG. 16 is a graph showing the relationship between the energization amount to the coil and the flow rate in the solenoid valve according to the conventional example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. . In the following description, a solenoid valve will be described as an example of an apparatus to which the valve structure is applied.

Example 1
With reference to FIGS. 1-8, the solenoid valve which concerns on Example 1 of this invention is demonstrated.

<Overall configuration of solenoid valve>
With reference to FIG. 1, the whole structure of the solenoid valve based on Example 1 of this invention is demonstrated. The solenoid valve SV is composed of a solenoid part S that is an actuator for reciprocating movement, a valve part V as a valve structure, and a housing part H that accommodates the solenoid part S and various members constituting the valve part V.

  The solenoid part S is magnetically attracted to the center post 14 by forming a magnetic circuit by the bobbin 11, the coil 12 wound around the bobbin 11 and generating a magnetic field by energization, and the magnetic field generated by the coil 12. And a plunger 13 as a reciprocating member. The solenoid part S also includes a pair of plates 15a and 15b and a case 15c, both of which are made of a magnetic member, so as to form the above magnetic circuit. The solenoid portion S includes a first spring 16a that urges the plunger 13 in a direction away from the center post 14, a spring receiver 16b that receives the first spring 16a, and an adjustment screw 16c that adjusts the position of the spring receiver 16b. It has. Further, the solenoid unit S includes a terminal 17 that is electrically connected to the coil 12.

  The housing portion H includes a housing main body 21 that houses various members constituting the solenoid portion S and the valve portion V, a cover 22 that is fixed to the housing main body 21, and a reinforcing member 23 that reinforces the housing main body 21. . The housing body 21 is provided with an input port portion 21a for allowing fluid to flow from the source pressure side and an output port portion 21b for discharging fluid to the output side (control pressure side). The housing body 21 is also provided with a connector portion 21c for making an electrical connection in order to obtain an electric supply from an external power source.

The valve portion V includes a rubber valve body 30 provided at the tip of the plunger 13 and a valve seat 40 that opens and closes when the valve body 30 is seated or separated. The valve portion V includes a metal or resin annular member 51 that supports the valve body 30 and a second spring 52 that biases the valve body 30 in a direction away from the center post 14. Further, the valve portion V includes a seal ring 60 that seals a gap between the outer peripheral surface of the valve seat 40 and the inner peripheral surface of the housing body 21, and a support member 70 that supports the valve seat 40.

  The desired flow rate (or fluid pressure associated with the flow rate) can be controlled by the balance between the urging force of the first spring 16a and the second spring 52 described above and the magnetic force due to the amount of current applied to the coil 12. The position of the spring receiver 16b is adjusted by the adjusting screw 16c.

<Valve part (valve structure)>
<< Valve configuration >>
In particular, the configuration of the valve portion V will be described in more detail with reference to FIGS. As described above, the valve portion V includes the valve body 30, the valve seat 40, the annular member 51, and the second spring 52.

  The valve body 30 includes a shaft portion 31, a fitting convex portion 32 provided on one end side of the shaft portion 31, an annular locking portion 33 provided on the other end side of the shaft portion 31, and a valve portion 34. Yes. The valve body 30 is fixed to the distal end of the plunger 13 by fitting the fitting convex portion 32 into a fitting concave portion 13 a provided at the distal end of the plunger 13. Further, the outer peripheral side of the shaft portion 31 is supported by the annular member 51, and the annular locking portion 33 is locked to the annular member 51, whereby the valve body 30 is also fixed to the annular member 51. Thereby, when the plunger 13 reciprocates, the valve body 30 and the annular member 51 also reciprocate together with the plunger 13. Further, the valve portion 34 provided in the valve body 30 is configured to expand in an umbrella shape from the distal end surface side of the plunger 13 toward the seat surface 43 of the valve seat 40. The central axis of the shaft portion 31 and the central axis of the valve portion 34 are configured to coincide with each other.

  The valve seat 40 is an annular member, and a through hole 41 is provided at the center thereof. The central axis of the through hole 41 is provided so as to coincide with the central axis of the plunger 13 and the valve body 30. A plurality of valve holes 42 are provided around the through hole 41 in the valve seat 40 at intervals in the circumferential direction. Further, the surface on the plunger 13 side of the valve seat 40 is the seat surface 43 described above. Furthermore, a plurality of notch portions 44 are formed at the outer peripheral surface side edge of the valve seat 40 at intervals in the circumferential direction. The notch 44 can be formed by cutting, but may be formed by other manufacturing methods.

  An annular member 51 made of metal or resin is configured to have a cylindrical portion 51a that supports the outer periphery of the shaft portion 31 of the valve body 30, and to extend from an end portion of the cylindrical portion 51a toward the outer peripheral surface side, and a second spring. 52 is integrally provided with a spring receiving portion 51b for receiving 52. The outer peripheral surface of the cylindrical portion 51 a in the annular member 51 is configured to slide with respect to the inner peripheral surface of the through hole 41 in the valve seat 40. The annular locking portion 33 of the valve body 30 is locked to the inner peripheral edge of the cylindrical portion 51a on the spring receiving portion 51b side.

<< Valve mechanism >>
In particular, the mechanism of the valve portion V will be described with reference to FIGS.

When the coil 12 of the solenoid unit S is not energized, no magnetic force is generated, and the plunger 13 moves away from the center post 14 by the urging force of the first spring 16a and the second spring 52. doing. Thereby, as shown in FIG. 6, the valve portion 34 of the valve body 30 is seated on the seat surface 43 of the valve seat 40. At this time, the umbrella-shaped valve portion 34 is bent and the surface of the valve portion 34 facing the seat surface 43 is seated on the seat surface 43. As a result, the valve is closed. FIG. 8 shows the positional relationship between the seating surface 43 and the valve portion 34 when the valve is closed. In a state where the valve portion 34 is seated on the seat surface 43, the surface of the valve portion 34 facing the seat surface 43 is located on the inner side of the region where the plurality of notch portions 44 are provided. It is configured to be in close contact with the surface 43. Thereby, in the state where the valve portion 34 is seated on the seating surface 43, in the radial direction, between the region where the plurality of valve holes 42 are provided and the region where the plurality of notch portions 44 are provided. An annular region (region indicated by R in FIG. 8) is a seal region. Thereby, the flow path from the input port portion 21a to the output port portion 21b is blocked by the seal region.

  As the energization amount of the solenoid portion S to the coil 12 is increased, the magnetic attractive force is increased, so that the plunger 13 moves toward the center post 14 against the urging force of the first spring 16a and the second spring 52. To do. Accordingly, the valve body 30 provided at the tip of the plunger 13 also moves toward the center post 14, so that the valve portion 34 in the valve body 30 moves away from the seat surface 43 of the valve seat 40. As a result, a gap is formed between the valve portion 34 and the seat surface 43, and a flow path is formed from the valve hole 42 to the outer peripheral surface side of the valve portion 34 (see arrow A in FIG. 7). Therefore, the fluid flowing in from the input port portion 21a is discharged from the output port portion 21b. Here, the position of the valve body 30 provided at the tip of the plunger 13 is determined according to the amount of current supplied to the coil 12, and the size of the gap between the valve portion 34 and the seat surface 43 is determined. Therefore, by controlling the energization amount to the coil 12, the flow rate and fluid pressure of the fluid discharged from the output port portion 21b can be controlled.

<Excellent point of solenoid valve according to this embodiment>
According to the solenoid valve SV according to the present embodiment, the energization is started from the state where the coil 12 is not energized, and the valve portion 34 of the valve body 30 is changed to the seat surface 43 of the valve seat 40 as the energization amount increases. The plunger 13 moves away from the direction. At this time, the valve portion 34 that has been seated on the seat surface 43 in a bent state is deformed so as to return to the original shape, and then moves away from the seat surface 43.

  Here, the valve portion 34 according to the present embodiment employs a configuration that expands in an umbrella shape from the tip surface side of the plunger 13 toward the seat surface 43. Therefore, the valve portion 34 of the valve body 30 according to the present embodiment is more easily separated from the seat surface 43 than when the valve portion 30 is separated from the seat surface from a state compressed from both sides as in the case of the conventional O-ring. Since the area of the seal region can also be set narrower than that of the conventional example, the valve portion 34 of the valve body 30 according to the present embodiment can be easily separated from the seat surface 43. Further, in the present embodiment, a plurality of notch portions 44 are formed on the outer edge of the valve seat 40 at intervals in the circumferential direction. Accordingly, in the process of returning from the bent state of the valve portion 34 to the original shape, the fluid flows through the plurality of notched portions 44 from the stage before the valve portion 34 leaves the seat surface 43. From the above, fluid control can be stably performed immediately after the start of energization (immediately after the valve starts to open). Further, since the valve portion 34 is easily separated from the seating surface 43, an error in flow rate control due to hysteresis can be reduced. In the case of the O-ring of the conventional example, the adhesion state changes every time the plunger reciprocates, and the flow characteristics vary. In the case of the solenoid valve SV according to the present embodiment, Such a problem is solved and the flow rate characteristic can be stabilized.

  In the solenoid valve SV according to the present embodiment, the outer peripheral surface of the cylindrical portion 51 a of the annular member 51 that supports the outer peripheral side of the shaft portion 31 of the valve body 30 is the inner peripheral surface of the through hole 41 in the valve seat 40. It is comprised so that it may slide with respect to. Thereby, the position shift of the central axis with respect to the valve seat 40 when the valve body 30 reciprocates can be suppressed. Therefore, the accuracy of the position where the valve portion 34 of the valve body 30 is seated on the seat surface 43 can be increased. In addition, since the outer peripheral surface of the cylindrical portion 51a of the annular member 51 that supports the outer peripheral side of the shaft portion 31 slides with respect to the inner peripheral surface of the through hole 41, the valve body 30 is moved smoothly.

Further, in the solenoid valve SV according to the present embodiment, as described above, in the process of returning the valve portion 34 from the bent state to the original shape, a plurality of cuts are made from the stage before the valve portion 34 leaves the seat surface 43. The fluid flows through the notch 44. That is, in the process of returning from the bent state of the valve portion 34 to the original shape, the area of the flow path through which the fluid flows gradually increases from the inner portion of the notch-shaped portion 44. In this embodiment, as shown in FIG. 8, the cutout portion 44 is formed in a V shape when viewed in the central axis direction. As a result, the area of the flow path through which the fluid flows is prevented from suddenly increasing in the process of returning from the bent state of the valve portion 34 to the original shape. The change in flow rate relative to the amount of current supplied to the coil 12 can be made linear and the maximum flow rate can be adjusted by setting the size, such as the angle and length of the notch-shaped portion 44, and the number of the cutout-like portions 44. .

  Further, in the solenoid valve SV according to the present embodiment, the flow rate with respect to a certain current value depends on the setting of the thickness and shape of the valve portion 34 in the valve body 30 and the shape, size and number of the notched portions 44. It can be made not to change so much depending on the magnitude of the pressure. The original pressure is the pressure of fluid flowing from the input port portion 21a. Thereby, even if it is a case where a source pressure changes, control pressure (pressure of the fluid discharged | emitted from the output port part 21b) can be stabilized.

(Example 2)
9 to 13 show a second embodiment of the present invention. In the first embodiment, the configuration in which a plurality of notch portions are provided at the circumferential edge of the edge of the valve seat on the outer peripheral surface side is shown. In this embodiment, the valve seat is cut into the valve seat. Instead of providing the notch-like part, a configuration in which a plurality of notch-like parts are provided at intervals in the circumferential direction at the distal end of the valve part of the valve body on the outer peripheral surface side is shown. Since other configurations and operations are the same as those in the first embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

<Overall configuration of solenoid valve>
Since the entire configuration of the solenoid valve according to the present embodiment is as described with reference to FIG. 1 in the first embodiment, the description thereof is omitted.

<Valve part (valve structure)>
<< Valve configuration >>
With reference to FIGS. 9-12, the structure of the valve | bulb part V is demonstrated in detail. As described in the first embodiment, the valve portion V includes the valve body 30, the valve seat 40, the annular member 51, and the second spring 52.

  The valve body 30 includes a shaft portion 31, a fitting convex portion 32 provided on one end side of the shaft portion 31, an annular locking portion 33 provided on the other end side of the shaft portion 31, and a valve portion 34. Yes. About the axial part 31, the fitting convex part 32, and the cyclic | annular latching | locking part 33, since it is the same as that of the case of the valve body 30 in the said Example 1, the description is abbreviate | omitted. And the valve part 34 is comprised so that it may expand in umbrella shape toward the seat surface 43 of the valve seat 40 from the front end surface side of the plunger 13 similarly to the case of the valve body 30 in Example 1. FIG. In the case of the present embodiment, a plurality of cutout portions 34a are formed at the distal end on the outer peripheral surface side of the valve portion 34 at intervals in the circumferential direction. Regarding these notch-shaped portions 34a, a notch may be formed by cutting, a shape portion such as a notch may be formed by molding, and the manufacturing method is not limited. The central axis of the shaft portion 31 and the central axis of the valve portion 34 are configured to coincide with each other.

The valve seat 40 is an annular member, and a through hole 41 is provided at the center thereof. The central axis of the through hole 41 is provided so as to coincide with the central axis of the plunger 13 and the valve body 30. A plurality of valve holes 42 are provided around the through hole 41 in the valve seat 40 at intervals in the circumferential direction. Further, the surface on the plunger 13 side of the valve seat 40 is the seat surface 43 described above. In the case of this embodiment, unlike the case of the first embodiment, the valve seat 40 is not provided with a plurality of notches.

  Since the annular member 51 and the second spring 52 are as described in the first embodiment, description thereof is omitted.

<< Valve mechanism >>
In particular, the mechanism of the valve portion V will be described with reference to FIG. 1, 6 and 7 used in the description of the first embodiment can also be used in the description of the present embodiment, and will be described with reference to these drawings.

  When the coil 12 of the solenoid unit S is not energized, no magnetic force is generated, and the plunger 13 moves away from the center post 14 by the urging force of the first spring 16a and the second spring 52. doing. Thereby, as shown in FIG. 6, the valve portion 34 of the valve body 30 is seated on the seat surface 43 of the valve seat 40. At this time, the umbrella-shaped valve portion 34 is bent and the surface of the valve portion 34 facing the seat surface 43 is seated on the seat surface 43. As a result, the valve is closed. FIG. 13 shows the positional relationship between the seating surface 43 and the valve portion 34 when the valve is closed. In a state where the valve portion 34 is seated on the seating surface 43, the surface of the valve portion 34 facing the seating surface 43 is a portion inside the region where the plurality of cutout portions 34a are provided. It is configured to be in close contact with the surface 43. Thereby, in the state where the valve portion 34 is seated on the seating surface 43, in the radial direction, between the region where the plurality of valve holes 42 are provided and the region where the plurality of notch portions 34a are provided. An annular region (region indicated by R in FIG. 13) is a seal region. Thereby, the flow path from the input port portion 21a to the output port portion 21b is blocked by the seal region.

  As the energization amount of the solenoid portion S to the coil 12 is increased, the magnetic attractive force is increased, so that the plunger 13 moves toward the center post 14 against the urging force of the first spring 16a and the second spring 52. To do. Accordingly, the valve body 30 provided at the tip of the plunger 13 also moves toward the center post 14, so that the valve portion 34 in the valve body 30 moves away from the seat surface 43 of the valve seat 40. As a result, a gap is formed between the valve portion 34 and the seat surface 43, and a flow path is formed from the valve hole 42 to the outer peripheral surface side of the valve portion 34 (see arrow A in FIG. 7). Therefore, the fluid flowing in from the input port portion 21a is discharged from the output port portion 21b. Here, the position of the valve body 30 provided at the tip of the plunger 13 is determined according to the amount of current supplied to the coil 12, and the size of the gap between the valve portion 34 and the seat surface 43 is determined. Therefore, by controlling the energization amount to the coil 12, the flow rate and fluid pressure of the fluid discharged from the output port portion 21b can be controlled.

<Excellent point of solenoid valve according to this embodiment>
Also in the case of the solenoid valve according to the present embodiment, the same effect as that of the solenoid valve according to the first embodiment can be obtained.

  In the present embodiment, a plurality of cutout portions 34a are formed at the distal end of the valve portion 34 of the valve body 30 on the outer peripheral surface side at intervals in the circumferential direction. Accordingly, in the process of returning from the bent state of the valve portion 34 to the original shape, the fluid flows through the plurality of notched portions 34 a from the stage before the valve portion 34 leaves the seat surface 43. Therefore, as in the case of the first embodiment, fluid control can be stably performed immediately after the start of energization (immediately after the valve starts to open).

Further, in the solenoid valve according to the present embodiment, as described above, a plurality of notches are formed from the stage before the valve portion 34 leaves the seat surface 43 in the process of returning from the bent state to the original shape. The fluid flows through the shaped portion 34a. That is, in the process of returning from the bent state of the valve part 34 to the original shape, the area of the flow path through which the fluid flows gradually increases from the inner part of the notch 34a. In the present embodiment, as shown in FIG. 13, the notch 34a has a V-shape when viewed in the central axis direction. Thus, as in the case of the first embodiment, the area of the flow path through which the fluid flows is prevented from suddenly expanding in the process of returning from the bent state of the valve portion 34 to the original shape. The change in flow rate relative to the amount of current supplied to the coil 12 can be made linear and the maximum flow rate can be adjusted by setting the size, such as the angle and length of the notch 34a, and the number of the cutouts 34a. .

  Also in the solenoid valve according to the present embodiment, the flow rate with respect to a certain current value depends on the setting of the thickness and shape of the valve portion 34 in the valve body 30 and the shape, size, and number of the notched portions 34a. It can be made not to change so much depending on the size of. Thereby, even if it is a case where a source pressure changes, control pressure (pressure of the fluid discharged | emitted from the output port part 21b) can be stabilized.

(Other)
In each of the above-described embodiments, the configuration in which the valve body 30 is provided at the tip of the plunger 13 is shown, but the present invention can also be applied to the case where the valve body is provided at the tip of a rod provided in the plunger. is there. Moreover, in each said Example, the structure in case the several valve hole 42 was provided in the circumference of the through-hole 41 in the valve seat 40 at intervals in the circumferential direction was shown. However, in the present invention, the number and arrangement of the valve holes 42 are not limited. Therefore, the number of valve holes 42 may be one. Moreover, in the said Example 1, the structure in case the some notch-shaped part 44 was formed in the edge by the side of the outer peripheral surface of the valve seat 40 at intervals in the circumferential direction was shown. However, in the present invention, the number and arrangement of the notch portions 44 are not limited. Therefore, the number of the notch portions 44 may be one. Furthermore, in the said Example 2, the structure in case the some notch-like part 34a was formed in the front-end | tip at the outer peripheral surface side of the valve part 34 of the valve body 30 at intervals in the circumferential direction was shown. However, in the present invention, the number and arrangement of the notch portions 34a are not limited. Therefore, the number of the notch portions 34a may be one. In each of the above embodiments, the case where the valve structure is applied to a solenoid valve has been described as an example. However, the valve structure of the present invention can also be applied to valve structures other than solenoid valves. In other words, the reciprocating actuator for reciprocating the reciprocating member is not limited to a solenoid, and a pneumatic actuator, a hydraulic actuator, a piezoelectric actuator, and the like are also applicable. The present invention is also applicable to a valve structure in which a valve body is provided on a reciprocating member configured to reciprocate by these various reciprocating actuators.

11 Bobbin 12 Coil 13 Plunger 13a Fitting recess 14 Center post 15a, 15b Plate 15c Case 16a First spring 16b Spring receiver 16c Adjust screw 17 Terminal 21 Housing body 21a Input port portion 21b Output port portion 21c Connector portion 22 Cover 23 Reinforcement member DESCRIPTION OF SYMBOLS 30 Valve body 31 Shaft part 32 Fitting convex part 33 Annular latching part 34 Valve part 34a Notch-like part 40 Valve seat 41 Through hole 42 Valve hole 43 Seat surface 44 Notch-like part 51 Annular member 51a Cylindrical part 51b Spring support Part 52 Second spring 60 Seal ring 70 Support member SV Solenoid valve H Housing part S Solenoid part V Valve part

Claims (2)

A rubber valve body provided at the tip of a reciprocating member configured to reciprocate by a reciprocating actuator;
In a valve structure comprising: a valve seat that is closed when the valve portion of the valve body is seated on a seat surface, and is opened when the valve portion is separated from the seat surface;
The valve body includes the valve portion that expands in an umbrella shape from the front end surface side of the reciprocating member toward the seat surface,
At the edge on the outer peripheral surface side of the valve seat, a notch is formed,
In the state in which the reciprocating member is moving to the seat surface side, the surface of the valve portion facing the seat surface in the bent state is seated on the seat surface, and in the radial direction, An annular region between the region in which the valve hole is provided and the region in which the notch-like part is provided becomes a seal region, and the reciprocating member moves in a direction away from the seating surface, A valve structure, wherein the valve portion is configured to be separated from the seating surface. A rubber valve body provided at the tip of a reciprocating member configured to reciprocate by a reciprocating actuator;
In a valve structure comprising: a valve seat that is closed when the valve portion of the valve body is seated on a seat surface, and is opened when the valve portion is separated from the seat surface;
The valve body has an umbrella shape extending from the front end surface side of the reciprocating member toward the seat surface, and includes the valve portion formed with a notch at the front end on the outer peripheral surface side,
In the state in which the reciprocating member is moving to the seat surface side, the surface of the valve portion facing the seat surface in the bent state is seated on the seat surface, and in the radial direction, An annular region between the region in which the valve hole is provided and the region in which the notch-like part is provided becomes a seal region, and the reciprocating member moves in a direction away from the seating surface, A valve structure, wherein the valve portion is configured to be separated from the seating surface.

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