JP4280266B2 - Fluid shut-off valve - Google Patents

Description

  The present invention relates to a fluid shutoff valve that has a movable iron core that is displaced under the excitation action of a coil and switches the communication state of a pressure fluid that circulates in a main body.

  Conventionally, as a fluid shut-off valve that switches the communication state of pressure fluid, an electromagnetic valve that displaces the valve body by attracting the movable iron core to the fixed iron core by the electromagnetic force generated under the excitation action of the solenoid coil has been used. .

  For example, such an electromagnetic valve is provided inside the case and excites a coil wound around the bobbin, so that the movable core provided inside the bobbin becomes a spring force by the electromagnetic force. In contrast, the valve is displaced in the axial direction, and the valve connected to the movable core is separated from the seat surface of the fluid passage. As a result, the fluid passage blocked by the valve communicates, and pressure fluid is circulated through the fluid passage (see, for example, Patent Document 1).

  In addition, by stopping energization of the coil, the electromagnetic force to the movable core is extinguished, and the valve is seated on the seat surface under the spring action of the spring, and the communication of the fluid passage is interrupted (for example, patent document) 1).

JP-A-9-232136

  By the way, in the electromagnetic valve according to the above-described prior art, for example, when the valve is closed so as to block the communication of the pressure fluid flowing through the fluid passage, the valve is driven and controlled with the pressure of the different pressure fluid. There is a request to want.

  However, since the solenoid valve according to Patent Document 1 is configured to switch the communication state of the fluid passage by displacing a single valve, the operation of the valve is controlled in response to different pressures of the pressure fluid. Is difficult.

  In addition, when such an electromagnetic valve is used in a vehicle such as an automobile, for example, an elastic spring is applied so that the valve is not opened apart from the seat surface due to vibration of the vehicle. It is necessary to set a large force in advance, but when opening the valve by electromagnetic force generated under the excitation action of the coil, a large driving force is required to displace the valve against the elastic force. In addition, it is necessary to increase the size of the coil in order to increase the electromagnetic force that generates the driving force.

  Furthermore, since the durability performance of the valve cannot be set according to the pressure state of the pressure fluid, for example, it is necessary to set the durability performance according to the case where the operation frequency of the valve is high.

  The present invention has been made in consideration of the above-described problems. The valve mechanism having the first and second valve portions can be controlled according to the pressure of different pressure fluid, and the durability of the valve mechanism can be improved. An object of the present invention is to provide a fluid shut-off valve that can be improved.

To achieve the above object, the present invention includes a main body portion comprising a valve body and a housing having a discharge port for pressure fluid supplied port and derived Ru is introduced,
A solenoid portion provided inside the housing and having a movable core that is attracted to the fixed core under an energizing action on the coil;
A first valve portion connected to the movable core and closing the valve under the excitation action of the solenoid; and a valve opening action under the pressing action of the pressure fluid; and the valve closing by the elastic force of the elastic member A second valve portion that operates, and a valve mechanism that switches a communication state between the supply port and the discharge port;
A valve seat that is formed in a communication passage for communicating the supply port and the discharge port, and in which the first valve portion is seated or separated;
With
The first and second valve portions are arranged to face each other through a communication path through which the pressure fluid flows in the valve body ,
The second valve portion disposed in the supply port performs a valve opening operation when the pressing force of the pressure fluid introduced from the supply port exceeds the elastic force of the elastic member. When the elastic force of the member exceeds the pressing force of the pressure fluid introduced from the supply port, the valve is closed.
The first valve portion is separated from the valve seat when the solenoid is not excited regardless of whether the second valve portion performs a valve opening operation or a valve closing operation, while the solenoid is excited. sometimes it characterized that you block the communication seated on the valve seat and said supply port and said discharge port.

  According to the present invention, the valve mechanism includes the first valve portion that performs the valve closing operation under the exciting action of the solenoid portion, and the second valve portion that performs the valve closing operation under the elastic action of the elastic member, The first and second valve portions are independently driven and controlled according to the pressure.

  Therefore, it is possible to control the communication state according to the different pressures of the pressure fluid by the first valve portion and the second valve portion in the single fluid shut-off valve, and the first valve portion and the second valve portion By adopting a separate configuration, it is possible to set the first and second valve portions in accordance with the respective usage conditions. Therefore, for example, the durability of the valve mechanism can be improved by selecting specifications (material, surface treatment, etc.) in consideration of wear resistance for the first and second valve portions.

  In addition, since the first valve portion and the second valve portion are disposed to face each other in the valve body, the first and second valve portions can be integrally provided in a single fluid cutoff valve. For example, as compared with the case where the first valve portion and the second valve portion are connected via a pipe or the like, it is possible to reduce the number of parts, the number of assembly steps, the manufacturing cost, and the like.

Furthermore, the second valve portion includes a spherical valve body seated on the seat portion facing the supply port,
When the pressing force of the pressure fluid is not biased against the second valve portion by biasing the valve body toward the seating portion under the resilient action of the resilient member, the valve body The valve can be in a closed state in which is seated on the seat. Moreover, the sheet | seat property with respect to a seating part can be improved by making a valve body spherical.

Furthermore, the valve body includes a first body portion on which the first valve portion is disposed,
A second body portion in which the second valve portion is disposed;
A partition wall that separates the first body part and the second body part and forms a communication path;
With
The first body part and the second body part may be communicated with each other via the communication path.

  Thereby, since the 1st and 2nd valve part which comprises a valve mechanism can be arrange | positioned inside a single valve body, compared with the case where the said 1st and 2nd valve part is each provided in another member. Thus, the manufacturing cost and the number of parts can be reduced. Further, the first body portion and the second body portion can be communicated with each other with a simple configuration in which the communication path is provided in the partition wall.

  Still further, the second body portion is provided with a cylindrical guide member between the partition wall and the valve plate, and the guide member has a large diameter portion for guiding the valve body along the axial direction, A small-diameter portion that guides the resilient member, and a holding portion that is formed between the large-diameter portion and the small-diameter portion and restricts the displacement of the valve body may be provided.

  Thus, the valve body can be guided to be displaced along the axial direction by the large-diameter portion of the guide member, and the radial displacement of the elastic member is regulated by the small-diameter portion. It is possible to positively bias the elastic force against the valve body, and it is possible to reliably hold the valve body when the valve body is separated from the seating portion by the holding portion to prevent further displacement.

  Further, by interposing the resilient member between the partition wall and the valve body, the resilient force of the resilient member is urged against the valve body, and the valve body is reliably and suitably seated. It can be seated.

  Furthermore, the valve plate can be easily clamped to the second body part by crimping the valve plate against the end of the second body part and forming a seating part on the valve plate, and A seating portion on which the valve body constituting the second valve portion can be seated can be easily provided.

  According to the present invention, the following effects can be obtained.

  That is, the valve mechanism includes a first valve portion that performs a valve closing operation under the excitation action of the solenoid portion, and a second valve portion that performs a valve closing operation under the elastic action of the elastic member, and according to the pressure of the pressure fluid Since the first and second valve portions can be independently driven and controlled, the communication state can be controlled in accordance with different pressures of the pressure fluid in a single fluid shutoff valve. In addition, since the first and second valve portions are configured separately, it is possible to set the first and second valve portions according to the respective usage conditions, and accordingly, the first and second valve portions are set. The durability of the valve mechanism including the two valve portions can be improved.

  Preferred embodiments of the fluid shut-off valve according to the present invention will be described in detail below with reference to the accompanying drawings.

  In FIG. 1, reference numeral 50 indicates an electromagnetic valve that functions as a fluid shutoff valve according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the electromagnetic valve 50 includes a housing 52 formed in a bottomed cylindrical shape, a valve body 56 that is connected to a lower portion of the housing 52 and includes a valve mechanism 54 therein. And a solenoid portion 58 provided inside the housing 52 and capable of displacing a part of the valve mechanism 54 under energization. The housing 52 and the valve body 56 constitute a main body.

  The housing 52 and the valve body 56 are made of, for example, a magnetic material.

  The valve body 56 is formed in a substantially cylindrical shape, and a flange portion 60 protruding outward in the radial direction is connected to the lower end portion of the housing 52. More specifically, after the flange portion 60 is inserted into the open lower end portion of the housing 52, the lower end portion is crimped integrally by pressing and deforming the lower end portion inward in a radial direction by a crimping means (not shown). Yes.

  The valve body 56 is opened at a lower end portion thereof and introduced into the introduction chamber (second body portion) 62 into which a pressure fluid (for example, pressure oil) is introduced from the outside, and is opened at a side portion of the valve body 56 to A pair of discharge ports (second ports) 64a and 64b through which the pressure fluid is discharged, a communication path 66 that communicates the introduction chamber 62 and the discharge ports 64a and 64b, and an axially upper portion of the communication path 66 And a shaft hole (first body portion) 70 through which the valve shaft 68 of the valve mechanism 54 is inserted, and an inlay portion 72 formed in the upper portion and inserted into the solenoid portion 58. The discharge ports 64a and 64b are formed on a straight line so as to be substantially orthogonal to the axis of the valve body 56 and symmetrical about the axis.

  A disk-shaped valve seat (valve plate) 74 constituting the valve mechanism 54 is inserted into the introduction chamber 62 from below, and the lower end portion of the valve body 56 is pressurized and deformed inward in a radial direction by a crimping means (not shown). Thus, the valve seat 74 is integrally crimped. A hole 76 is formed in the central portion of the valve seat 74 and functions as a supply port (first port) when pressure fluid is introduced into the introduction chamber 62.

  The introduction chamber 62 is formed with a substantially constant diameter along the axial direction, and a communication path 66 is formed in a partition wall 63 formed between the introduction chamber 62 and the shaft hole 70. The communication path 66 communicates the introduction chamber 62 and the discharge ports 64 a and 64 b through the shaft hole 70. The communication passage 66 is formed to have a smaller diameter than the inner diameter of the introduction chamber 62. The hole 76 is formed coaxially with the introduction chamber 62 and the shaft hole 70.

  A pair of seal members 78a and 78b are mounted on the side surfaces of the valve body 56 via annular grooves so as to sandwich the discharge ports 64a and 64b, and when the valve body 56 is mounted on an external fluid device (not shown). The seal members 78a and 78b are in contact with the side surfaces of the external fluid device, and the leakage of the pressure fluid from the discharge ports 64a and 64b is prevented between the valve body 56 and the external fluid device, so that the pressure fluid is hermetically sealed. -Liquid tightness is maintained.

  The shaft hole 70 has a substantially constant diameter and extends in the axial direction. The lower end of the shaft hole 70 faces the introduction chamber 62 through the communication path 66, and the upper end is opened so as to face the solenoid portion 58. .

  The valve mechanism 54 is provided in a control valve part (first valve part) 80 that opens and closes under the excitation action of the solenoid part 58 and an introduction chamber 62 of the valve body 56, and performs a check operation that opens and closes according to the pressure of the pressure fluid. And a valve portion (second valve portion) 82.

  The control valve portion 80 is provided between the valve shaft 68 provided inside the valve body 56 and the solenoid portion 58 so as to be displaceable along the axial direction, and between the flange portion 84 of the valve shaft 68 and the valve body 56. The first return spring 86 is included. In addition, this 1st return spring 86 consists of coil springs, for example.

  The valve shaft 68 includes a first shaft portion 88 inserted into the valve body 56 through the shaft hole 70, a second shaft portion 90 inserted into the solenoid portion 58, and the first shaft portion 88. And a flange portion 84 provided between the second shaft portion 90 and projecting radially outward.

  The outer peripheral surface of the first shaft portion 88 abuts on the inner peripheral surface of the shaft hole 70 and is guided by the shaft hole 70 when slidingly displaced along the axial direction. The first shaft portion 88 is formed with a reduced diameter portion 92 that is reduced in diameter in the radial direction and spaced from the inner peripheral surface of the shaft hole 70 by a predetermined distance.

  Further, a valve body portion 94 that protrudes in a hemispherical shape is formed at the lower end portion of the first shaft portion 88, and when the valve shaft 68 is displaced downward along the axial direction, the opening portion of the communication passage 66 is formed. It sits on the formed first seat 96. Thereby, the communication between the introduction chamber 62 and the discharge ports 64a and 64b via the communication path 66 is blocked. That is, the valve shaft 68 functions as a valve body that switches the communication state of the communication path 66.

  The second shaft portion 90 is formed to have a diameter smaller than that of the first shaft portion 88, and a movable core 98 that constitutes the solenoid portion 58 is fixed (press-fit, crimped, etc.) through a fitting hole. At this time, the movable core 98 is restricted from being displaced downward (in the direction of arrow A) by the lower end of the movable core 98 coming into contact with the flange portion 84.

  A first return spring 86 is interposed in the flange portion 84 between the flange portion 84 and the enlarged diameter step portion 100 provided in the shaft hole 70, and the elastic force S1 of the first return spring 86 is The valve shaft 68 is urged so as to be displaced toward the solenoid portion 58 (in the direction of arrow B). That is, the control valve portion 80 is in a valve open state (normally open) in which the valve body portion 94 of the valve shaft 68 is separated from the communication passage 66 under the elastic action of the first return spring 86 when the solenoid portion 58 is not excited. is there.

  The check valve portion 82 includes a retainer (guide member) 102 disposed inside the introduction chamber 62, a spherical valve body 104 that is displaceably provided along the retainer 102, the valve body 104, and the partition wall 63. A second return spring (bounce member) 106 interposed therebetween, and a valve seat 74 mounted on the lower end portion of the introduction chamber 62 and on which the valve body 104 is seated. This 2nd return spring 106 consists of coil springs, for example, and is energizing so that valve body 104 may be displaced to the valve seat 74 side (arrow A direction).

  The retainer 102 is formed in a cylindrical shape from a resin material (for example, synthetic resin), and after being inserted into the introduction chamber 62, the valve seat 74 is held in the introduction chamber 62 by being crimped to the valve body 56. Is done.

  The retainer 102 is formed on the valve seat 74 side, and is formed on the large diameter portion 102a where the valve body 104 is displaceably guided, and on the partition wall 63 side of the valve body 56, and is contracted with respect to the large diameter portion 102a. It includes a small diameter portion 102b having a diameter, and a holding surface (holding portion) 108 that is formed between the large diameter portion 102a and the small diameter portion 102b and is held when the valve body 104 is displaced upward. The large-diameter portion 102a guides the valve body 104 so as to be displaceable along the axial direction, and the small-diameter portion 102b restricts displacement in the radial direction by inserting the second return spring 106 therethrough. .

  On the inner peripheral surface of the retainer 102, a plurality of communication grooves 110 recessed in the radially outward direction are formed along the axial direction. As shown in FIG. 3, the communication groove 110 is provided at a predetermined interval in the circumferential direction on the inner peripheral surface of the retainer 102, and has a hole 76 and a communication path 66 of the valve seat 74 that functions as a supply port. Communicate.

  In the valve seat 74, a second seating portion (sitting portion) 112 is formed at the opening of the hole 76 on the valve body 104 side, and the valve body 104 is seated on the second seating portion 112, thereby Communication between the hole 76 and the introduction chamber 62 is blocked.

  The solenoid part 58 is provided at a substantially central part of the housing 52 and protrudes downward, the coil bobbin 118 disposed on the outer peripheral side of the fixed core part 114 and around which the coil 116 is wound, A movable core 98 is provided on the inner peripheral side of the coil bobbin 118 so as to be displaceable along the axial direction.

  The fixed core portion 114 has a cylindrical guide portion 120 that protrudes downward from a substantially central portion of the housing 52 by a predetermined length and opens toward the valve body 56 side. A movable core 98 is slidably disposed inside the guide portion 120, and a cylindrical coil bobbin 118 is provided on the outer peripheral surface of the guide portion 120. A pair of enlarged diameter portions 124a and 124b that are radially expanded in the radially outward direction are formed at the upper end portion and the lower end portion of the coil bobbin 118. It is wound.

  Between the coil 116 wound around the coil bobbin 118 and the housing 52, a coil sealing body 126 for molding the outer peripheral surface of the coil 116 and a part of the coil bobbin 118 with a resin material is provided. The body 126 is continuously formed integrally with the coupler portion 128 protruding from the side portion of the housing 52.

  The coupler unit 128 is provided with a terminal unit 132 that exposes a terminal 130 connected to the coil 116 via the coil bobbin 118. The coil 116 is energized through the terminal 130 by supplying current to the terminal portion 132 from a power source (not shown).

  An O-ring having a substantially triangular cross section is formed between the fixed core portion 114 of the housing 52 and the coil sealing body 126 and between the flange portion 60 of the valve body 56 and the coil sealing body 126, respectively. 134a and 134b are mounted, respectively, to maintain airtightness and liquid tightness between the housing 52 and the valve body 56 and the coil sealing body 126.

  The movable core 98 is press-fitted into the second shaft portion 90 of the valve shaft 68 through the fitting hole, and the valve shaft 68 is integrally displaced under the displacement action of the movable core 98. The movable core 98 has a stepped portion 136 having an enlarged diameter at the lower portion on the valve body 56 side. That is, the movable core 98 is restricted from being displaced upward (in the direction of arrow B) when the upper end of the valve shaft 68 contacts the inner wall surface of the housing.

  The solenoid valve 50 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described. As shown in FIGS. 1 and 2, the control valve unit 80 constituting the valve mechanism 54 is in the valve-open state when the supply of current to the solenoid unit 58 is stopped and is not energized, and the check valve unit 82. The case where the valve body 104 in FIG. 2 is in the valve open state separated from the second seating portion 112 and the pressure fluid is flowing from the hole portion 76 of the valve seat 74 to the discharge ports 64a and 64b will be described as an initial state.

  In such an initial state, the valve body 104 constituting the check valve portion 82 is formed by the second return spring by the pressing force P of the pressure fluid introduced into the introduction chamber 62 from below through the hole portion 76 of the valve seat 74. The valve body 104 is held by the holding surface 108 of the retainer 102 by being pushed upward (in the direction of arrow B) against the elastic force S <b> 2 of 106. In other words, the pressing force P of the pressurized fluid applied to the valve body 104 is larger than the elastic force S2 of the second return spring 106 (P> S2). Then, after the pressure fluid in the introduction chamber 62 is guided to the communication passage 66 through the communication groove 110 of the retainer 102, the pressure fluid is discharged from the discharge ports 64 a and 64 b through the first seat portion 96 in which the valve body portion 94 is separated. Has been.

  Next, in a state where both the control valve unit 80 and the check valve unit 82 are opened, the pressing force P (pressure) of the pressure fluid becomes smaller than the elastic force S2 of the second return spring 106 (P <S2), as shown in FIG. 4, the valve body 104 is displaced downward (in the direction of arrow A) against the pressing force P of the pressure fluid under the elastic action of the second return spring 106, The valve seat 74 is seated on the second seat 112. Thereby, the communication between the hole 76 of the valve seat 74 functioning as the supply port and the discharge ports 64a and 64b is cut off, and the flow of the pressure fluid is stopped.

  As described above, the elastic force S2 of the second return spring 106 is set in advance according to the pressing force P (pressure) of the pressure fluid when the valve body 104 is closed to interrupt the flow of the pressure fluid. Thus, the check valve portion 82 can be closed until the pressure fluid reaches a desired pressure (pressing force P) or more. In other words, the valve body 104 is controlled to open when the pressure of the pressure fluid (pressing force P) exceeds a preset value of the elastic force S2.

  That is, in the check valve portion 82, when the elastic force S2 of the second return spring 106 is larger than the pressing force P of the pressurized fluid applied to the valve body 104 through the hole 76 (S2> P), the valve body When the elastic force S2 of the second return spring 106 is smaller than the pressing force P (S2 <P), on the contrary, the valve body 104 is moved to the closed state by seating 104 on the second seat 112. The valve is opened from the second seating portion 112. In other words, the valve body 104 constituting the check valve portion 82 is configured to be automatically controlled to open and close according to the magnitude of the pressing force P by the pressure fluid.

  Next, in the state where both the control valve unit 80 and the check valve unit 82 shown in FIGS. 1 and 2 are opened, the pressing force P (pressure) of the pressure fluid is based on the elastic force S2 of the second return spring 106. If it is larger (P> S2), as shown in FIG. 5, the valve body 104 overcomes the elastic force S2 of the second return spring 106 under the pressure action of the pressure fluid and moves upward (in the direction of arrow B). The fluid is pushed up and separated from the second seating portion 112, and the hole 76 of the valve seat 74 and the discharge ports 64 a and 64 b communicate with each other so that the pressure fluid flows. In other words, when the pressing force P of the pressure fluid is smaller than the elastic force S2 of the second return spring 106 (P <S2), the check valve portion 82 including the valve body 104 causes the valve seat 74 and the discharge port 64a. , 64b, the communication of the pressure fluid is cut off, and the flow of the pressure fluid cannot be stopped.

  As described above, when the flow of the pressure fluid cannot be stopped by the check valve portion 82, the flow of the pressure fluid can be blocked by controlling the control valve portion 80 under the exciting action of the solenoid portion 58. It is. In this case, first, the solenoid unit 58 is excited by energizing the coil 116 by energizing a power source (not shown), and sequentially passes through the housing 52, the guide unit 120, the movable core 98, the inlay unit 72, and the flange unit 60. Thus, a magnetic flux returning to the housing 52 is generated.

  Due to the electromagnetic force generated by the solenoid part 58, the movable core 98 is displaced in a direction (arrow A direction) away from the fixed core part 114 by overcoming the elastic force S1 of the first return spring 86. The valve shaft 68 connected integrally with the movable core 98 is displaced downward (in the direction of arrow A) under the guide action of the shaft hole 70 of the valve body 56, and accordingly, the control valve unit 80 is moved. The valve body portion 94 of the valve shaft 68 is seated on the first seat portion 96. Accordingly, the communication between the introduction chamber 62 and the discharge ports 64a and 64b through the communication passage 66 in which the first seating portion 96 is formed is blocked, and the flow of the pressure fluid through the communication passage 66 is stopped.

  At this time, since the valve shaft 68 is displaced together with the movable core 98 based on the downward thrust obtained under the excitation action of the solenoid portion 58, the pressure fluid applied to the valve shaft 68 from below. The valve body portion 94 of the valve shaft 68 can be suitably displaced and seated on the first seat portion 96 without being pushed up by the pressing force P.

  In other words, the control valve portion 80 including the valve shaft 68 can be seated on the first seat portion 96 by the electromagnetic force of the solenoid portion 58 regardless of the magnitude of the pressing force P in the pressure fluid. The communication between the introduction chamber 62 and the discharge ports 64a and 64b through the communication passage 66 opened in the first seat portion 96 can be blocked.

  On the other hand, in the electromagnetic valve 50 in which the flow of the pressure fluid is blocked by the control valve portion 80 in this manner, when the pressure fluid is again in a communication state in which the pressure fluid can flow, the energization from a power source (not shown) is stopped and the solenoid By deenergizing the portion 58, the electromagnetic force in the solenoid portion 58 disappears, and the valve shaft 68 and the movable core 98 are integrally moved upward (in the direction of arrow B) by the elastic force S1 of the first return spring 86. The valve body portion 94 of the valve shaft 68 is separated from the first seat portion 96. As a result, the introduction chamber 62 and the discharge ports 64a and 64b communicate with each other via the communication passage 66 facing the first seat portion 96, and the pressure fluid can flow. At this time, the pressing force P of the pressure fluid is larger than the elastic force S2 of the second return spring 106 that constitutes the check valve portion 82 (P> S2), so that the valve body 104 has an elastic force of the second return spring 106. The check valve portion 82 is also in the valve open state without being seated on the second seat portion 112 under the action.

  As described above, the control valve unit 80 constituting the valve mechanism 54 freely controls the valve opening / closing operation by the valve shaft 68 by switching the current supply state to the solenoid unit 58 from a controller (not shown). The flow state of the pressure fluid by the control valve unit 80 can be switched.

  As described above, in the present embodiment, as the valve mechanism 54, the check valve portion 82 that switches the valve open / closed state according to the pressing force P of the pressurized fluid, and the valve open / valve under the excitation action of the solenoid portion 58 are provided. A control valve unit 80 for switching the closed state, and the valve body 104 constituting the check valve unit 82 is closed by causing the valve member 104 to be seated on the second seating portion 112 by the elastic force S2 of the second return spring 106. While blocking the flow of the pressure fluid, the valve shaft 68 constituting the control valve portion 80 is seated on the first seat portion 96 under the displacement action of the movable core 98 to close the valve, thereby allowing the pressure fluid to flow. Can be cut off.

  At this time, by arbitrarily setting the elastic force S2 of the second return spring 106, it is possible to control the opening / closing operation of the valve body 104 that is displaced against the elastic force S2 by the pressing force P of the pressure fluid. In addition, when a pressing force P greater than the elastic force S2 of the second return spring 106 is applied, the valve shaft 68 of the control valve portion 80 is displaced under the excitation action of the solenoid portion 58 to close the valve. Thus, the flow of the pressure fluid can be stopped.

  In this way, in the single solenoid valve 50, the check valve portion 82 and the control valve portion 80 that block the flow of the pressure fluid according to the pressing force P (pressure) of the pressure fluid are independently controlled separately. can do.

  In other words, the check valve portion 82 that can be closed by the elastic force S2 of the second return spring 106 and the control valve portion 80 that can be closed under the excitation action of the solenoid portion 58 are provided. For example, when the pressure fluid is a low pressure, the check valve unit 82 is closed to shut off the flow of the pressure fluid, and when the pressure fluid is a high pressure, The control valve unit 80 is closed to block the flow of the pressure fluid.

  In addition, for example, when the valve body 104 and / or the valve seat 74 constituting the check valve portion 82 is worn and the check valve portion 82 cannot completely block the flow of the pressure fluid, the control valve portion Since the flow of the pressure fluid can be reliably blocked by 80, the electromagnetic valve 50 can function sufficiently.

  Further, the check valve portion 82 and the control valve portion 80 that constitute the valve mechanism 54 are arranged so as to be coaxial with each other inside the valve body 56 and the housing 52, and through the introduction chamber 62 and the shaft hole 70. Adjacent to each other. Accordingly, the check valve portion 82 and the control valve portion 80 can be integrally provided in the single electromagnetic valve 50. For example, the check valve portion 82 and the control valve portion 80 are connected via a pipe or the like. Compared to the case of connection, it is possible to reduce the number of parts, the number of assembly steps, the manufacturing cost, and the like.

  Still further, by configuring the control valve unit 80 and the check valve unit 82 in the valve mechanism 54 separately, the control valve unit 80 can have a structure that can withstand high pressure fluid, and the check valve unit 82. May have a simple structure that can withstand only a low-pressure fluid.

  For example, since the check valve unit 82 operates when the pressure fluid is at a low pressure, the operation frequency (number of times) of the valve body 104 is larger than the operation frequency (number of times) of the valve shaft 68 in the control valve unit 80. Therefore, there is a concern that the valve body 104 may accelerate wear with respect to the valve shaft 68. However, since the material and surface treatment of the valve body 104 and the valve shaft 68 can be set separately, the material and surface treatment having higher wear resistance than the valve shaft 68 are used. By adopting the body 104, it is possible to effectively reduce the wear of the valve body 104 and improve its durability.

  In addition, even when the pressure fluid is a high pressure, a single solenoid valve 50 having a control valve unit 80 can control the flow state of the pressure fluid and can displace the control valve unit 80. By setting the electromagnetic force by the portion 58 to a desired amount, it is possible to freely control the thrust when the control valve portion 80 is closed. That is, by setting in advance the electromagnetic force generated by the solenoid unit 58 according to the pressure fluid pressure, the control valve unit 80 can be suitably displaced according to the pressure fluid pressure.

  Further, the control valve unit 80 is configured to open the valve shaft 68 by the elastic force S1 of the first return spring 86 when the solenoid unit 58 is not excited. Therefore, the elastic force S1 of the first return spring 86 may be large enough to open the valve shaft 68, so that the elastic force S1 can be set small. The electromagnetic force of the solenoid portion 58 that displaces the valve shaft 68 against the force S1 can be reduced. Therefore, it is possible to reduce the size of the solenoid unit 58 and save power.

  Further, the check valve portion 82 capable of switching the flow state of the pressure fluid is attached to the spherical valve body 104, the second return spring 106 that presses the valve body 104 toward the valve seat 74, and the introduction chamber 62. The retainer 102 can function with a simple configuration. As a result, the check valve portion 82 can be reduced in weight as compared with the control valve portion 80 that requires the solenoid portion 58, and the operation sound and impact when the check valve portion 82 performs the valve opening / closing operation can be reduced. Can be reduced. In other words, the check valve portion 82 can eliminate the need for the solenoid portion 58 that opens and closes the control valve portion 80. Accordingly, wear that occurs when the valve body 104 comes into contact with the second seating portion 112 and the holding surface 108 is reduced, and the durability of the check valve portion 82 including the valve body 104 can be improved. .

  Further, the retainer 102, the second return spring 106, the valve body 104, and the valve seat 74 constituting the check valve portion 82 are inserted into the introduction chamber 62 of the valve body 56 in this order, and the valve seat 74 is inserted into the valve body 56. By caulking to the end portion, the check valve portion 82 can be simply assembled and configured. Further, the second seat 112 on which the valve body 104 of the check valve 82 is seated can be easily provided by a simple operation of crimping and fixing the valve seat 74 to the end of the valve body 56. Thus, the assembling property of the electromagnetic valve 50 can be improved.

  Furthermore, by making the shape of the valve body 104 spherical, it is possible to stabilize the seating property with respect to the second seating portion 112, and by adopting, for example, a coil spring as the second return spring 106, The valve body 104 can be reliably and stably held at the end of the second return spring 106. Therefore, the elastic force S2 that presses the valve body 104 against the second seat portion 112 can be suitably biased, and the elastic force S2 according to the pressing force P (pressure) of the pressure fluid. Can be easily set.

  Still further, the retainer 102 constituting the check valve portion 82 includes a large diameter portion 102a formed on the valve seat 74 side, a small diameter portion 102b formed on the control valve portion 80 side, and the large diameter portion 102a and the small diameter portion. It is comprised from the holding surface 108 formed between 102b. Therefore, the spherical valve body 104 can be preferably guided along the axial direction by the large diameter portion 102a, the seating position of the valve body 104 with respect to the second seating portion 112 can be stabilized, and the seat Property can be improved.

  Further, since the second return spring 106 can be supported by being guided in the axial direction by the small diameter portion 102b, the second return spring 106 is not displaced in the radial direction in the introduction chamber 62, and the second return spring 106 is supported. It is possible to stably urge the spring force S2 of the spring 106 against the valve body 104. Further, when the valve body 104 is displaced upward under the pressure action of the pressure fluid, the displacement is regulated by the holding surface 108. Thereby, for example, even when the pressing force P of the pressure fluid applied to the valve body 104 is increased, the displacement of the valve body 104 can be reliably regulated.

  Further, since the control valve portion 80 and the check valve portion 82 constituting the valve mechanism 54 are provided inside the single valve body 56, the control valve portion 80 and the check valve portion 82 are separately provided. Compared with the case where this valve body is provided, the cost required for the valve body 56 can be reduced, and the manufacturing cost of the electromagnetic valve 50 can be reduced.

1 is an overall longitudinal sectional view of a solenoid valve according to an embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional view showing the vicinity of a valve mechanism in the electromagnetic valve of FIG. 1. It is sectional drawing along the III-III line of FIG. FIG. 3 is an enlarged longitudinal sectional view showing a state where a check valve portion is seated on a second seat portion of a valve seat and a hole portion is closed in the electromagnetic valve of FIG. 2. FIG. 3 is an enlarged longitudinal sectional view showing a state where a control valve portion is seated on a first seating portion and a communication path is closed in the electromagnetic valve of FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 50 ... Solenoid valve 52 ... Housing 54 ... Valve mechanism 56 ... Valve body 58 ... Solenoid part 60 ... Flange part 62 ... Introduction chamber 63 ... Partition wall 64a, 64b ... Discharge port 66 ... Communication path 68 ... Valve shaft 70 ... Shaft hole 74 ... Valve seat 76 ... hole 80 ... control valve 82 ... check valve 86 ... first return spring 88 ... first shaft 90 ... second shaft 94 ... valve body 96 ... first seat 98 ... movable core 102 ... Retainer 104 ... Valve element 106 ... Second return spring 110 ... Communication groove 112 ... Second seating part 114 ... Fixed core part 116 ... Coil 118 ... Coil bobbin 126 ... Coil seal 128 ... Coupler part

Claims (6)

A body portion comprising a valve body and a housing having a discharge port for pressure fluid supplied port and derived Ru is introduced,
A solenoid portion provided inside the housing and having a movable core that is attracted to the fixed core under an energizing action on the coil;
A first valve portion connected to the movable core and closing the valve under the excitation action of the solenoid; and a valve opening action under the pressing action of the pressure fluid; and the valve closing by the elastic force of the elastic member A second valve portion that operates, and a valve mechanism that switches a communication state between the supply port and the discharge port;
A valve seat that is formed in a communication passage for communicating the supply port and the discharge port, and in which the first valve portion is seated or separated;
With
The first and second valve portions are arranged to face each other through a communication path through which the pressure fluid flows in the valve body ,
The second valve portion disposed in the supply port performs a valve opening operation when the pressing force of the pressure fluid introduced from the supply port exceeds the elastic force of the elastic member. When the elastic force of the member exceeds the pressing force of the pressure fluid introduced from the supply port, the valve is closed.
The first valve portion is separated from the valve seat when the solenoid is not excited regardless of whether the second valve portion performs a valve opening operation or a valve closing operation, while the solenoid is excited. fluid cutoff valve characterized that you block the communication between the exhaust port and the supply port and sometimes seated on the valve seat. The fluid shut-off valve according to claim 1,
The second valve portion includes a spherical valve body seated on a seating portion facing the supply port,
The fluid shut-off valve, wherein the valve body is urged toward the seating portion under a resilient action of the resilient member. The fluid cutoff valve according to claim 1 or 2,
The valve body includes a first body portion on which the first valve portion is disposed,
A second body part in which the second valve part is disposed;
A partition wall that separates the first body part and the second body part, and the communication path is formed;
With
The fluid cutoff valve, wherein the first body part and the second body part communicate with each other through the communication path. The fluid shut-off valve according to claim 3,
In the second body portion, a cylindrical guide member is disposed between the partition wall and the valve plate, and the guide member includes a large-diameter portion that guides the valve body along an axial direction, and the elastic member. A fluid shut-off valve comprising: a small-diameter portion that guides the generating member; and a holding portion that is formed between the large-diameter portion and the small-diameter portion and restricts displacement of the valve body. The fluid cutoff valve according to claim 3 or 4,
The fluid shut-off valve, wherein the elastic member is interposed between the partition wall and the valve body. The fluid shut-off valve according to claim 4 or 5,
The said valve plate is crimped with respect to the edge part of the said 2nd body part, The said seat part is formed in the said valve plate, The fluid cutoff valve characterized by the above-mentioned.

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