JP7337666B2 - valve device - Google Patents

Description

The technology disclosed herein relates to valve devices.

Patent Document 1 discloses a valve device. The valve device of Patent Document 1 includes a main valve seat, a main valve body that abuts the main valve seat, and a sub-valve body that is disposed on the opposite side of the main valve seat from the main valve body and abuts the main valve body. and The main valve body of Patent Document 1 is made of brass.

JP 2019-132347 A

In the valve device of Patent Document 1, when the main valve body contacts the main valve seat and the sub-valve body contacts the main valve body, the main valve body is sandwiched between the main valve seat and the sub-valve body. At the same time, compressive stress and tensile stress are generated inside the main valve body. In particular, when the hardness of the main valve body is lower than that of the sub-valve body, a large compressive stress or tensile stress may be generated on the surface of the main valve body with which the main valve seat and the sub-valve body abut.

Ordinary objects tend to be weaker against tensile stress than against compressive stress. Therefore, if a large tensile stress occurs on the surface of the main valve body with which the main valve seat and the sub valve body abut, the main valve body, for example, deforms. It is conceivable that it may be damaged. Therefore, in the present specification, it is possible to suppress the generation of tensile stress on the relatively soft contact surface when the relatively soft contact surface and the relatively hard contact surface are in contact with each other in the valve device. provide technology that can

The valve device disclosed in this specification may include a valve seat having a first outlet through which fluid flows, and a valve body that abuts against the valve seat and closes the first outlet. good. The valve seat may have a first contact surface facing the valve body. The valve body includes an outer valve body having a second outflow port through which fluid flows out, and an outer valve body disposed on the side opposite to the valve seat with the outer valve body interposed therebetween. 2, and an inner valve body that closes the outflow port. The inner valve body may have a second contact surface facing the outer valve body. The outer valve body has an outer contact surface that contacts the first contact surface of the valve seat when the valve body contacts the valve seat, and an outer contact surface that contacts the first contact face of the valve seat when the valve body contacts the valve seat. and an inner contact surface that contacts the second contact surface of the inner valve body. The hardness of the outer contact surface may be lower than the hardness of the first contact surface. The hardness of the inner contact surface may be lower than the hardness of the second contact surface. When the outer contact surface of the outer valve body contacts the first contact surface of the valve seat, the curvature of the outer contact surface at the first contact point, which is the first contact point, is equal to the first contact surface. It may be larger than the curvature of the first contact surface at the contact point. The curvature of the inner contact surface at the second contact point, which is the point at which the second contact surface of the inner valve body first contacts the inner contact surface of the outer valve body, It may be larger than the curvature of the second contact surface at the two contact points.

According to this configuration, since the degree of curvature of the relatively hard first contact surface is gentler than the degree of curvature of the relatively soft outer contact surface, the soft outer contact surface comes into contact with the hard first contact surface. When this is done, it is possible to suppress the generation of tensile stress on the soft outer contact surface. Similarly, since the degree of curvature of the relatively hard second contact surface is gentler than the degree of curvature of the relatively soft inner contact surface, when the soft inner contact surface comes into contact with the hard second contact surface, , the generation of tensile stress on the soft inner contact surface can be suppressed.

The valve device disclosed in this specification may include a valve seat having a first outlet through which fluid flows, and a valve body that abuts against the valve seat and closes the first outlet. good. The valve seat may have a first contact surface facing the valve body. The valve body includes an outer valve body having a second outflow port through which fluid flows out, and an outer valve body disposed on the opposite side of the valve seat with the outer valve body interposed therebetween. 2, and an inner valve body that closes the outflow port. The inner valve body may have a second contact surface facing the outer valve body. The outer valve body has an outer contact surface that contacts the first contact surface of the valve seat when the valve body contacts the valve seat, and an outer contact surface that contacts the first contact face of the valve seat when the valve body contacts the valve seat. and an inner contact surface that contacts the second contact surface of the inner valve body. The hardness of the first contact surface may be lower than the hardness of the outer contact surface. The hardness of the second contact surface may be lower than the hardness of the inner contact surface. The curvature of the first contact surface at the first contact point, which is the first contact point when the outer contact surface of the outer valve body contacts the first contact surface of the valve seat, is equal to the first contact surface. It may be larger than the curvature of the outer contact surface at one contact point. The curvature of the second contact surface at the second contact point, which is the first contact point when the second contact surface of the inner valve body contacts the inner contact surface of the outer valve body, It may be larger than the curvature of the inner contact surface at the second contact point.

According to this configuration, similarly to the above, it is possible to suppress the generation of tensile stress in the relatively soft first and second contact surfaces.

The intersection of a first normal line that is normal to the outer contact surface at the first contact point and a second normal line that is normal to the inner contact surface at the second contact point is the outer valve It may be located inside the body.

According to this configuration, the force acting from the valve seat to the outer valve body and the force acting from the inner valve body to the outer valve body act toward the inside of the outer valve body in a well-balanced manner. It is possible to suppress local deformation and damage of the part.

A distance from the first abutment point to the intersection point may be equal to a distance from the second abutment point to the intersection point.

According to this configuration, forces act on the outer valve body in a well-balanced manner, so that it is possible to suppress partial deformation or damage of the outer valve body.

A straight line connecting the first contact point and the second contact point may be located closer to the first outlet than the intersection point.

According to this configuration, deformation of the outer valve body can be suppressed.

A straight line connecting the first contact point and the second contact point may be positioned on the same straight line as the first normal line and the second normal line.

According to this configuration, forces act on the outer valve body in a well-balanced manner, so that it is possible to suppress partial deformation or damage of the outer valve body.

The first contact surface may be planar when viewed in a cross section parallel to the axial direction of the valve body. The second contact surface may be planar when viewed in a cross section parallel to the axial direction of the valve body.

According to this configuration, it is possible to suppress the occurrence of tensile stress in the outer contact surface that contacts the first contact surface. Moreover, it is possible to suppress the occurrence of tensile stress on the inner contact surface that contacts the second contact surface. That is, by driving the valve device, the tensile stress generated in the outer valve body can be effectively suppressed.

The first contact surface and the second contact surface may be made of metal. The outer contact surface and the inner contact surface may be made of resin.

According to this configuration, it is possible to suppress the occurrence of tensile stress on the outer and inner contact surfaces made of relatively soft resin.

1 is a cross-sectional view of a valve device according to an embodiment; FIG. FIG. 2 is an enlarged view of portion II of FIG. 1 (hatching is omitted in FIG. 2); FIG. 3 is a view corresponding to FIG. 2 of a valve device according to another embodiment;

A valve device 1 according to an embodiment will be described with reference to the drawings. As shown in FIG. 1, the valve device 1 according to the embodiment includes a main body 2 and a valve body 20. As shown in FIG. The valve device 1 has a two-stage valve structure in which the valve body 20 includes an inner valve body 30 and an outer valve body 40 . The valve device 1 is a device for controlling the flow of liquid or gaseous fuel (an example of fluid). The valve device 1 is, for example, a pressure reducing valve device for reducing the pressure of fuel. The fuel in the valve device 1 is, for example, automobile fuel (eg, gasoline, hydrogen gas, etc.).

The body 2 of the valve device 1 comprises a peripheral wall 12 and a valve seat 10 . The main body 2 is made of metal (for example, an alloy). A first valve chamber 11 is formed inside the main body 2 . Fuel flows into the first valve chamber 11 from the upstream side (lower side in FIG. 1) of the main body 2 . A peripheral wall 12 of the main body 2 is formed in a substantially cylindrical shape. The peripheral wall 12 extends from the upstream side of the main body 2 to the downstream side. The peripheral wall 12 is located around the first valve chamber 11 and surrounds the first valve chamber 11 . A valve body 20 is arranged in the first valve chamber 11 .

A valve seat 10 of the main body 2 is located downstream of the peripheral wall 12 . The valve seat 10 is integrally formed with the peripheral wall 12 . The valve seat 10 is formed with a first outflow port 14 through which fuel flows out. The fuel that has flowed into the first valve chamber 11 flows out from the first outlet 14 into the pressure regulating chamber 90 . The pressure regulating chamber 90 is located downstream of the first valve chamber 11 . The pressure regulating chamber 90 is connected to a fuel supply destination (not shown) via a fuel supply path 91, for example. Fuel flowing out of the pressure regulating chamber 90 is supplied to a fuel supply destination (for example, an automobile engine or a fuel cell stack) through a fuel supply passage 91 .

The valve seat 10 has an inner protrusion 15 and a first contact surface 13 . The inner protrusion 15 protrudes radially inward from the valve seat 10 . A first outlet 14 is formed inside the inner protrusion 15 . The first contact surface 13 is positioned around the first outlet 14 . The first contact surface 13 extends from the first outlet 14 to the inner peripheral surface 121 of the peripheral wall 12 . The first contact surface 13 is configured in a substantially conical surface shape. In the cross section shown in FIG. 1 (the cross section parallel to the axial direction of the valve body 20), the first contact surface 13 is configured in a planar shape. The first contact surface 13 faces the first valve chamber 11 side. The first contact surface 13 faces the valve body 20 arranged in the first valve chamber 11 . The first contact surface 13 is inclined with respect to the axial direction of the valve body 20 . The first contact surface 13 faces the valve body 20 . The valve body 20 contacts the first contact surface 13 .

Next, the valve body 20 will be explained. The valve body 20 is arranged upstream of the valve seat 10 . The valve body 20 contacts and separates from the first contact surface 13 of the valve seat 10 by advancing and retreating in the axial direction. The valve body 20 closes and opens the first outflow port 14 formed in the valve seat 10 by contacting and separating from the valve seat 10 . The first outflow port 14 is closed by the contact of the valve body 20 with the valve seat 10 . The first outflow port 14 is opened by separating the valve body 20 from the valve seat 10 .

The valve body 20 includes an inner valve body 30 and an outer valve body 40 . The inner valve body 30 is arranged inside the outer valve body 40 in the radial direction of the valve body 20 . The inner valve body 30 is arranged on the side opposite to the valve seat 10 with the outer valve body 40 interposed therebetween. The inner valve body 30 has a peripheral wall 32 , a valve portion 31 and a tip portion 33 . The inner valve body 30 is made of metal (for example, alloy). A spring chamber 35 is formed inside the inner valve body 30 . A small coil spring 50 is arranged in the spring chamber 35 . The small coil spring 50 expands and contracts along the axial direction of the valve body 20 . The small coil spring 50 presses the valve body 20 (the inner valve body 30 and the outer valve body 40) from the upstream side toward the downstream side. A peripheral wall 32 of the inner valve body 30 is formed in a substantially cylindrical shape. The peripheral wall 32 extends in the axial direction of the valve body 20 . The peripheral wall 32 is positioned around the spring chamber 35 and surrounds the spring chamber 35 .

A valve portion 31 of the inner valve body 30 is located downstream of the peripheral wall 32 . The valve portion 31 is formed integrally with the peripheral wall 32 . The valve portion 31 has a second contact surface 34 made of metal. The second contact surface 34 is configured in a substantially conical surface shape. In the cross section shown in FIG. 1 (the cross section parallel to the axial direction of the valve body 20), the second contact surface 34 is planar. The second contact surface 34 is inclined with respect to the axial direction of the valve body 20 . The second contact surface 34 faces the outer valve body 40 side. The second contact surface 34 faces the outer valve body 40 . The second contact surface 34 contacts the outer valve body 40 . The second contact surface 34 faces the first contact surface 13 of the valve seat 10 with the outer valve body 40 interposed therebetween.

A distal end portion 33 of the inner valve body 30 is located downstream of the valve portion 31 . The tip portion 33 is formed integrally with the valve portion 31 . The tip portion 33 protrudes from the valve portion 31 toward the first outflow port 14 of the valve seat 10 . The tip portion 33 is inserted into the first outlet 14 .

Next, the outer valve body 40 will be explained. The outer valve body 40 is arranged outside the inner valve body 30 in the radial direction of the valve body 20 . The outer valve body 40 surrounds the inner valve body 30 . The outer valve body 40 is arranged between the inner valve body 30 and the valve seat 10 . The outer valve body 40 is sandwiched between the inner valve body 30 and the valve seat 10 when the valve device 1 is closed.

The outer valve body 40 includes a peripheral wall 42 , a base portion 45 and a valve portion 41 . The outer valve body 40 is made of resin (for example, silicone rubber, synthetic rubber, or the like). A second valve chamber 43 is formed inside the outer valve body 40 . Fuel flows into the second valve chamber 43 from the upstream side of the main body 2 (lower side in FIG. 1). The inner valve body 30 is arranged in the second valve chamber 43 .

A peripheral wall 42 of the outer valve body 40 is formed in a substantially cylindrical shape. The peripheral wall 42 extends in the axial direction of the valve body 20 . The peripheral wall 42 is located around the second valve chamber 43 and surrounds the second valve chamber 43 . The base portion 45 is formed in a substantially annular shape. The base 45 is formed integrally with the peripheral wall 42 . The base portion 45 is fixed to the upstream end portion of the peripheral wall 42 in the axial direction. The base portion 45 protrudes radially inward of the peripheral wall 42 .

The valve portion 41 of the outer valve body 40 is located downstream of the peripheral wall 42 . The valve portion 41 is formed integrally with the peripheral wall 42 . A second outlet 44 through which fuel flows is formed in the valve portion 41 . The second outflow port 44 communicates with the first outflow port 14 formed in the valve seat 10 . Fuel flows out from the second valve chamber 43 to the pressure regulating chamber 90 through the second outlet 44 and the first outlet 14 . The tip portion 33 of the inner valve body 30 is inserted into the second outflow port 44 . The second outflow port 44 is opened and closed by moving the inner valve body 30 forward and backward with respect to the outer valve body 40 . When the inner valve body 30 contacts the outer valve body 40, the second outflow port 44 is closed. When the inner valve body 30 is separated from the outer valve body 40, the second outflow port 44 is opened.

The valve portion 41 includes an outer contact surface 61 made of resin and an inner contact surface 62 made of resin. The outer contact surface 61 is positioned around the second outflow port 44 . The outer contact surface 61 faces the valve seat 10 side. The outer contact surface 61 faces the first contact surface 13 of the valve seat 10 . The outer contact surface 61 is configured as a convex curved surface. The outer contact surface 61 protrudes toward the first contact surface 13 of the valve seat 10 . The outer contact surface 61 contacts the first contact surface 13 when the outer valve body 40 advances with respect to the valve seat 10 . The outer contact surface 61 is pressed against the first contact surface 13 . The hardness of the outer contact surface 61 is lower than the hardness of the first contact surface 13 . The hardness of each contact surface 13, 61 can be measured, for example, by various hardness tests specified in JIS.

As shown in FIG. 2, when the outer contact surface 61 of the outer valve body 40 contacts the first contact surface 13 of the valve seat 10, the first contact point 71 is defined as the first contact point 71. The curvature of the outer contact surface 61 at the contact point 71 is greater than the curvature of the first contact surface 13 at the first contact point 71 . That is, the degree of curvature of the outer contact surface 61 is steeper than the degree of curvature of the first contact surface 13 (the degree of curvature of the first contact surface 13 is greater than the degree of curvature of the outer contact surface 61). It is curved more gently than it is).

The inner contact surface 62 of the outer valve body 40 will be described. As shown in FIG. 1, the inner contact surface 62 faces the inner valve body 30 side. The inner contact surface 62 faces the second contact surface 34 of the inner valve body 30 . The inner contact surface 62 is configured as a convex curved surface. The inner contact surface 62 protrudes toward the second contact surface 34 of the inner valve body 30 . The inner contact surface 62 contacts the second contact surface 34 when the inner valve body 30 advances relative to the outer valve body 40 . The inner contact surface 62 is pressed against the second contact surface 34 . The inner contact surface 62 is located upstream of the second outlet 44 . The hardness of the inner contact surface 62 is lower than the hardness of the second contact surface 34 . The hardness of each contact surface 34, 62 can be measured, for example, by various hardness tests specified in JIS.

As shown in FIG. 2, when the inner contact surface 62 of the outer valve body 40 first contacts the second contact surface 34 of the inner valve body 30, the second contact point 72 is defined as the second contact point 72. The curvature of the inner abutment surface 62 at the abutment point 72 is greater than the curvature of the second abutment surface 34 at the second abutment point 72 . That is, the degree of curvature of the inner contact surface 62 is sharper than the degree of curvature of the second contact surface 34 (the degree of curvature of the second contact surface 34 is greater than the degree of curvature of the inner contact surface 62). It is curved more gently than it is).

A geometric relationship between the outer contact surface 61 and the inner contact surface 62 of the outer valve body 40 will be described. As shown in FIG. 2, the normal to the outer contact surface 61 at the first contact point 71 is the first normal N1, and the normal to the inner contact surface 62 at the second contact point 72 is the second normal N2. Then, the intersection X between the first normal line N1 and the second normal line N2 is positioned inside the outer valve body 40 . The distance L1 from the first contact point 71 to the intersection X is equal to the distance L2 from the second contact point 72 to the intersection X. A straight line M connecting the first contact point 71 and the second contact point 72 is located closer to the first outlet 14 than the intersection X of the first normal line N1 and the second normal line N2.

As shown in FIG. 1, the valve device 1 further includes a piston 100 and a large coil spring 102. As shown in FIG. Piston 100 is configured to be movable in the vertical direction in FIG. The piston 100 is pressed toward the valve body 20 by a large coil spring 102 . The piston 100 has a tip portion 101 protruding toward the tip portion 33 of the inner valve body 30 .

Next, the operation of the valve device 1 will be described. Assume that the valve device 1 is initially in the closed state. That is, it is assumed that the valve body 20 is in contact with the valve seat 10 and the first outflow port 14 is closed. It is also assumed that the inner valve body 30 is in contact with the outer valve body 40 and the second outflow port 44 is closed. In the valve closed state, the fuel pressure in the pressure regulating chamber 90 is maintained at a relatively high level.

(Valve opening operation)
In the valve device 1, when the fuel is supplied to the fuel supply destination and the fuel flows out from the pressure regulating chamber 90, the pressure of the fuel in the pressure regulating chamber 90 decreases. Then, the piston 100 receiving the pressure of the fuel in the pressure regulating chamber 90 is pushed toward the valve element 20 by the large coil spring 102, and the piston 100 moves toward the valve element 20 side. When the fuel pressure in the pressure regulating chamber 90 drops significantly, the piston 100 moves greatly toward the valve body 20 accordingly. On the other hand, when the amount of decrease in the fuel pressure in the pressure regulating chamber 90 is small, the amount of movement of the piston 100 toward the valve body 20 is accordingly also small.

As the piston 100 moves toward the valve body 20, the tip 101 of the piston 100 comes into contact with the tip 33 of the inner valve body 30 and presses the inner valve body 30 upstream. This causes the inner valve body 30 to move upstream. When the piston 100 largely moves toward the valve element 20, the inner valve element 30 largely moves upstream. On the other hand, when the amount of movement of the piston 100 toward the valve body 20 is small, the amount of movement of the inner valve body 30 toward the upstream side is also small.

As the inner valve body 30 moves upstream, the second contact surface 34 of the inner valve body 30 separates from the inner contact surface 62 of the outer valve body 40, opening the second outlet 44. . When the second outflow port 44 is opened, the fuel flows out from the second valve chamber 43 to the pressure regulating chamber 90 via the second outflow port 44 . This state is the first valve open state. When the fuel pressure in the pressure regulating chamber 90 is relatively high, the valve is in the first open state.

As the inner valve body 30 moves further upstream from the first valve open state, the peripheral wall 32 of the inner valve body 30 comes into contact with the base portion 45 of the outer valve body 40 and presses the base portion 45 upstream. Then, the outer valve body 40 moves upstream. As the outer valve body 40 moves upstream, the outer contact surface 61 of the outer valve body 40 separates from the first contact surface 13 of the valve seat 10 and the first outflow port 14 opens. When the first outflow port 14 is opened, fuel flows out from the first valve chamber 11 to the pressure regulating chamber 90 through the first outflow port 14 . This state is the second valve open state. When the fuel pressure in the pressure regulating chamber 90 is relatively low, the second valve open state is entered.

(valve closing operation)
Next, the valve closing operation will be explained. The valve closing operation is an operation opposite to the valve opening operation described above. In the valve device 1 described above, when fuel flows into the pressure regulating chamber 90, the pressure of the fuel in the pressure regulating chamber 90 rises. Then, the pressure of the fuel in the pressure regulating chamber 90 presses the piston 100 to the side opposite to the valve body 20, and the piston 100 moves to the side opposite to the valve body 20 (that is, downstream). As the piston 100 moves downstream, the inner valve element 30 moves downstream accordingly.

As the inner valve body 30 moves downstream, the second contact surface 34 of the inner valve body 30 contacts the inner contact surface 62 of the outer valve body 40, and the second outlet 44 is closed. . As the inner valve body 30 moves further downstream, the outer valve body 40 is pushed downstream by the inner valve body 30, and the inner valve body 30 and the outer valve body 40 move downstream. As the inner valve body 30 and the outer valve body 40 move downstream, the outer contact surface 61 of the outer valve body 40 comes into contact with the first contact surface 13 of the valve seat 10 and the first outflow port 14 is closed. be closed.

In the valve device 1 described above, the outer valve body 40 is sandwiched between the inner valve body 30 and the valve seat 10 when the valve is closed. The outer valve body 40 is pressed by the inner valve body 30 and the valve seat 10 . When the outer valve body 40 is pressed by the inner valve body 30 and the valve seat 10 , a compressive stress is mainly generated inside the outer valve body 40 .

[effect]
The valve device 1 according to the embodiment has been described above. As is clear from the above description, in the valve device 1 , the outer valve body 40 includes the resin outer contact surface 61 that contacts the metal first contact surface 13 of the valve seat 10 , and the inner valve body 30 . and an inner contact surface 62 made of resin that contacts the second contact surface 34 made of metal. The hardness of the outer contact surface 61 is lower than the hardness of the first contact surface 13 , and the hardness of the inner contact surface 62 is lower than the hardness of the second contact surface 34 . In this valve device 1, the outer contact surface 61 of the outer valve body 40 first contacts the first contact surface 13 of the valve seat 10 at the first contact point 71. is greater than the curvature of the first contact surface 13 at the first contact point 71 . Also, the curvature of the inner contact surface 62 at the second contact point 72, which is the first contact point when the second contact surface 34 of the inner valve body 30 contacts the inner contact surface 62 of the outer valve body 40, is , is greater than the curvature of the second abutment surface 34 at the second abutment point 72 .

According to this configuration, the degree of bending of the first contact surface 13 made of relatively hard metal is gentler than the degree of bending of the outer contact surface 61 made of relatively soft resin. It is possible to suppress the occurrence of tensile stress in the outer contact surface 61 made of soft resin when it contacts the first contact surface 13 . Since the first contact surface 13 made of hard metal does not protrude from the outer contact surface 61 made of soft resin, tensile stress is generated in the outer contact surface 61 made of soft resin. can be suppressed. Similarly, the degree of curvature of the second contact surface 34 made of relatively hard metal is gentler than the degree of curvature of the inner contact surface 62 made of relatively soft resin. It is possible to suppress the occurrence of tensile stress in the inner contact surface 62 made of soft resin when it comes into contact with the surface 34 . Since the second contact surface 34 made of hard metal does not protrude from the inner contact surface 62 made of soft resin, tensile stress is generated in the inner contact surface 62 made of soft resin. can be suppressed.

Objects tend to be weaker to tensile stress than to compressive stress. By suppressing the occurrence of tensile stress on the outer contact surface 61 and the inner contact surface 62 made of relatively soft resin, the outer contact surface 61 and the inner contact surface 62 made of resin can be deformed. Damage can be suppressed. As a result, the strength of the outer valve body 40 having the outer contact surface 61 and the inner contact surface 62 made of resin can be improved, and the strength of the valve device 1 can be improved.

The outer contact surface 61 and the inner contact surface 62 of the outer valve body 40 are made of resin to seal the first outflow port 14 and the second outflow port 44 when the valve device 1 is in the closed state. is preferred. However, relatively soft resins are more likely to deform or damage when subjected to tensile stress than relatively hard metals. In other words, when the outer valve body 40 is sandwiched between the valve seat 10 and the inner valve body 30, a large tensile stress is generated on the outer contact surface 61 and the inner contact surface 62, which are made of resin. The valve body 40 may be deformed or damaged. Therefore, the above-described valve device 1 that can suppress the generation of tensile stress on the outer contact surface 61 and the inner contact surface 62 is particularly effective.

In the valve device 1 described above, the intersection X between the first normal line N1 of the outer contact surface 61 at the first contact point 71 and the second normal line N2 of the inner contact surface 62 at the second contact point 72 is It is located inside the valve body 40 . According to this configuration, forces act from the valve seat 10 and the inner valve body 30 toward the inside of the outer valve body 40 in a well-balanced manner. Therefore, it is possible to suppress local deformation or damage of a part of the outer valve body 40 .

In the valve device 1 described above, the distance L1 from the first contact point 71 to the intersection X is equal to the distance L2 from the second contact point 72 to the intersection X. According to this configuration, forces act on the outer valve body 40 in a well-balanced manner, so that local deformation or damage of a part of the outer valve body 40 can be suppressed.

In the valve device 1 described above, the straight line M connecting the first contact point 71 and the second contact point 72 is closer to the first outflow port 14 than the intersection X of the first normal line N1 and the second normal line N2. positioned. According to this configuration, deformation of the outer valve body 40 can be suppressed.

In the valve device 1 described above, the first contact surface 13 is formed in a planar shape. Also, the second contact surface 34 is configured in a planar shape. It is possible to suppress the occurrence of tensile stress in the resin outer contact surface 61 that contacts the first contact surface 13 . In addition, it is possible to suppress the occurrence of tensile stress on the resin inner contact surface 62 that contacts the second contact surface 34 . That is, the tensile stress generated in the outer valve body 40 can be effectively suppressed by driving the valve device 1 .

Although one embodiment has been described above, specific aspects are not limited to the above embodiment. In the following description, the same reference numerals are given to the same configurations as those in the above description, and the description thereof is omitted.

(Other examples)
(1) In the above embodiment, the straight line M connecting the first contact point 71 and the second contact point 72 extends in a direction different from that of the first normal line N1 and the second normal line N2. is not limited to In another embodiment, the straight line M connecting the first contact point 71 and the second contact point 72 may be positioned on the same straight line as the first normal line N1 and the second normal line N2. According to this configuration, force acts on the outer valve body 40 from the valve seat 10 and the inner valve body 30 in a well-balanced manner, so that local deformation or damage to a part of the outer valve body 40 can be suppressed. can.

(2) In the above embodiment, the first contact surface 13 of the valve seat 10 is flat when viewed in cross section parallel to the axial direction of the valve body 20. However, the present invention is not limited to this configuration. not something. In another embodiment, the first contact surface 13 of the valve seat 10 may be curved in the same cross-sectional view. Also, in the same cross-sectional view, the first contact surface 13 of the valve seat 10 may be configured to be convex or concave.

In this specification, the curvature of the first abutment surface 13 of the valve seat 10 is the curvature on the convex surface when the first abutment surface 13 is convex. Moreover, when the first contact surface 13 is a concave surface, it is the curvature of the concave surface. In either case, the curvature of the first contact surface 13 of the valve seat 10 is smaller than the curvature of the outer contact surface 61 of the outer valve body 40 (the curvature of the outer contact surface 61 is less than the curvature of the first contact surface 13). curvature). In addition, when the first contact surface 13 is flat, the curvature of the first contact surface 13 is naturally smaller than the curvature of the outer contact surface 61 (the curvature of the outer contact surface 61 is less than the curvature of the first contact surface 61). greater than the curvature of surface 13). That is, the degree of curvature of the first contact surface 13 is gentler than the degree of curvature of the outer contact surface 61 (the degree of curvature of the outer contact surface 61 is steeper than the degree of curvature of the first contact surface 13). .

(3) In the above-described embodiment, the second contact surface 34 of the inner valve body 30 is planar when viewed in cross section parallel to the axial direction of the valve body 20. However, the configuration is limited to this. not to be In another embodiment, the second contact surface 34 of the inner valve body 30 may be curved in the same cross-sectional view. Also, in the same cross-sectional view, the second contact surface 34 of the inner valve body 30 may be configured to be convex or concave.

In this specification, the curvature of the second contact surface 34 of the inner valve body 30 is the curvature of the convex surface when the second contact surface 34 is convex. Also, when the second contact surface 34 is a concave surface, it is the curvature of the concave surface. In either case, the curvature of the second contact surface 34 of the inner valve body 30 is smaller than the curvature of the inner contact surface 62 of the outer valve body 40 (the curvature of the inner contact surface 62 is less than the curvature of the second contact surface 34). ). Further, when the second contact surface 34 is flat, the curvature of the second contact surface 34 is naturally smaller than the curvature of the inner contact surface 62 (the curvature of the inner contact surface 62 is less than the curvature of the second contact surface 62). greater than the curvature of surface 34). That is, the degree of curvature of the second contact surface 34 is gentler than the degree of curvature of the inner contact surface 62 (the degree of curvature of the inner contact surface 62 is steeper than the degree of curvature of the second contact surface 34). .

(4) In another embodiment, part of the outer valve body 40 may be made of metal. For example, the inside of the outer valve body 40 may be made of metal, and the outer portion (the portion including the outer contact surface 61 and the inner contact surface 62) may be made of resin.

(5) In another embodiment, the distance L1 from the first contact point 71 to the intersection X and the distance L2 from the second contact point 72 to the intersection X may be different distances.

(6) In the above embodiment, the intersection X between the first normal line N1 and the second normal line N2 was located inside the outer valve body 40, but the configuration is not limited to this. In another embodiment, the intersection point X between the first normal N1 and the second normal N2 may be positioned outside the outer valve body 40 .

(7) In the above embodiment, the straight line M connecting the first contact point 71 and the second contact point 72 is located closer to the first outlet 14 than the intersection X of the first normal line N1 and the second normal line N2. Although the configuration is positioned on the side, it is not limited to this configuration. In another embodiment, the straight line M connecting the first contact point 71 and the second contact point 72 is opposite to the first outlet 14 from the intersection X of the first normal line N1 and the second normal line N2. It may be configured to be located on the side. That is, the intersection point X may be positioned closer to the first outflow port 14 than the straight line M is.

(8) In the above embodiment, the first contact surface 13 of the valve seat 10 and the second contact surface 34 of the inner valve body 30 are made of metal, but the construction is not limited to this. In another embodiment, the first contact surface 13 and the second contact surface 34 may be made of resin. In this case, it is sufficient that the curvature of the contact surface with relatively low hardness is larger than the curvature of the contact surface with relatively high hardness. For example, the relationship between the first contact surface 13 of the valve seat 10 and the outer contact surface 61 of the outer valve body 40 is such that the hardness of the outer contact surface 61 is lower than the hardness of the first contact surface 13 and The curvature of the surface 61 is larger than the curvature of the first contact surface 13 . For example, the first contact surface 13 shown in FIG. 2 may be made of resin with relatively high hardness, and the outer contact surface 61 may be made of resin with relatively low hardness. Further, the relationship between the second contact surface 34 of the inner valve body 30 and the inner contact surface 62 of the outer valve body 40 is such that the hardness of the inner contact surface 62 is lower than the hardness of the second contact surface 34, The relationship is such that the curvature of the contact surface 62 is greater than the curvature of the second contact surface 34 . For example, the second contact surface 34 shown in FIG. 2 may be made of resin with relatively high hardness, and the inner contact surface 62 may be made of resin with relatively low hardness.

(9) In the above embodiment, the outer contact surface 61 and the inner contact surface 62 of the outer valve body 40 are made of resin, but the construction is not limited to this. In other embodiments, the outer abutment surface 61 and the inner abutment surface 62 may be made of metal. Also in this case, it is sufficient that the curvature of the contact surface with relatively low hardness is larger than the curvature of the contact surface with relatively high hardness. For example, the first contact surface 13 shown in FIG. 2 may be made of metal with relatively high hardness, and the outer contact surface 61 may be made of metal with relatively low hardness. Alternatively, for example, the second contact surface 34 shown in FIG. 2 may be made of metal with relatively high hardness, and the inner contact surface 62 may be made of metal with relatively low hardness.

(10) In the above embodiment, the hardness of the outer contact surface 61 of the outer valve body 40 is lower than the hardness of the first contact surface 13 of the valve seat 10, and the curvature of the outer contact surface 61 is the first contact surface. Although the curvature is larger than that of the surface 13, it is not limited to this configuration. In another embodiment, the hardness of the first contact surface 13 of the valve seat 10 may be lower than the hardness of the outer contact surface 61 of the outer valve body 40, contrary to the above embodiment. For example, the first contact surface 13 may be made of resin, and the outer contact surface 61 may be made of metal harder than the resin. In this case, as shown in FIG. 3 , the curvature of the first contact surface 13 is set larger than the curvature of the outer contact surface 61 . The curvature of the contact surface with relatively low hardness is set to be larger than the curvature of the contact surface with relatively high hardness.

Further, in the above embodiment, the hardness of the inner contact surface 62 of the outer valve body 40 is lower than the hardness of the second contact surface 34 of the inner valve body 30, and the curvature of the inner contact surface 62 is the second contact surface. Although the curvature is greater than the surface 34, it is not limited to this configuration. In another embodiment, contrary to the above embodiments, the hardness of the second contact surface 34 of the inner valve body 30 may be lower than the hardness of the inner contact surface 62 of the outer valve body 40 . For example, the second contact surface 34 may be made of resin, and the inner contact surface 62 may be made of metal harder than the resin. In this case, as shown in FIG. 3, the curvature of the second contact surface 34 is set larger than the curvature of the inner contact surface 62 . The curvature of the contact surface with relatively low hardness is set to be larger than the curvature of the contact surface with relatively high hardness. With this configuration as well, it is possible to suppress the occurrence of tensile stress on the relatively soft contact surface.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or in the drawings exhibit technical utility either singly or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

1: valve device, 2: main body, 10: valve seat, 11: first valve chamber, 13: first contact surface, 14: first outflow port, 20: valve body, 30: inner valve body, 33: tip Part 34: Second contact surface 35: Spring chamber 40: Outer valve body 43: Second valve chamber 44: Second outflow port 50: Small coil spring 61: Outer contact surface 62: Inner Contact surface 71: first contact point 72: second contact point 90: pressure regulating chamber 100: piston 102: large coil spring

Claims (7)

a valve seat having a first outlet through which fluid exits;
a valve body that abuts against the valve seat and closes the first outflow port,
The valve seat has a first contact surface facing the valve body,
The valve body includes an outer valve body having a second outflow port through which fluid flows out, and an outer valve body disposed on the side opposite to the valve seat with the outer valve body interposed therebetween. 2 and an inner valve body that closes the outflow port,
The inner valve body has a second contact surface facing the outer valve body,
The outer valve body has an outer contact surface that contacts the first contact surface of the valve seat when the valve body contacts the valve seat, and an outer contact surface that contacts the first contact face of the valve seat when the valve body contacts the valve seat. and an inner contact surface that contacts the second contact surface of the inner valve body,
the hardness of the outer contact surface is lower than the hardness of the first contact surface;
the hardness of the inner contact surface is lower than the hardness of the second contact surface;
When the outer contact surface of the outer valve body contacts the first contact surface of the valve seat, the curvature of the outer contact surface at the first contact point, which is the first contact point, is equal to the first contact surface. larger than the curvature of the first contact surface at the contact point,
The curvature of the inner contact surface at the second contact point, which is the point at which the second contact surface of the inner valve body first contacts the inner contact surface of the outer valve body, larger than the curvature of the second contact surface at the two contact points,
The first contact surface and the second contact surface are made of metal,
The valve device , wherein the outer contact surface and the inner contact surface are made of resin . a valve seat having a first outlet through which fluid exits;
a valve body that abuts against the valve seat and closes the first outflow port,
The valve seat has a first contact surface facing the valve body,
The valve body includes an outer valve body having a second outflow port through which fluid flows out, and an outer valve body disposed on the side opposite to the valve seat with the outer valve body interposed therebetween. 2 and an inner valve body that closes the outflow port,
The inner valve body has a second contact surface facing the outer valve body,
The outer valve body has an outer contact surface that contacts the first contact surface of the valve seat when the valve body contacts the valve seat, and an outer contact surface that contacts the first contact face of the valve seat when the valve body contacts the valve seat. and an inner contact surface that contacts the second contact surface of the inner valve body,
The hardness of the first contact surface is lower than the hardness of the outer contact surface,
the hardness of the second contact surface is lower than the hardness of the inner contact surface;
The curvature of the first contact surface at the first contact point, which is the first contact point when the outer contact surface of the outer valve body contacts the first contact surface of the valve seat, is equal to the first contact surface. larger than the curvature of the outer contact surface at one contact point,
The curvature of the second contact surface at the second contact point, which is the first contact point when the second contact surface of the inner valve body contacts the inner contact surface of the outer valve body, larger than the curvature of the inner contact surface at the second contact point,
The first contact surface and the second contact surface are made of resin,
A valve device , wherein the outer contact surface and the inner contact surface are made of metal . 3. The valve device according to claim 1 or 2,
The intersection of a first normal line that is normal to the outer contact surface at the first contact point and a second normal line that is normal to the inner contact surface at the second contact point is the outer valve A valve device located inside the body. A valve device according to claim 3,
A valve device, wherein the distance from the first abutment point to the intersection point is equal to the distance from the second abutment point to the intersection point. A valve device according to claim 3 or 4,
A valve device, wherein a straight line connecting the first contact point and the second contact point is positioned closer to the first outflow port than the intersection point. A valve device according to claim 3 or 4,
A valve device, wherein a straight line connecting the first contact point and the second contact point is located on the same straight line as the first normal line and the second normal line. The valve device according to claim 1 or any one of claims 3 to 6 citing claim 1,
The first contact surface is configured in a planar shape when viewed in a cross section parallel to the axial direction of the valve body,
The valve device, wherein the second abutment surface is flat when viewed in a cross section parallel to the axial direction of the valve body.

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