JP2011149502A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To satisfactorily suppress noise by arresting vibration as much as possible by a compact and economical structure. <P>SOLUTION: The solenoid valve 10 includes a valve seat 44 provided inside a body portion 30; a plunger portion 70 having a main piston 52 capable of being seated on the valve seat 44; a plunger pin 72 protruding from the plunger portion 70; a slitted guide ring 82 enclosing the plunger pin 72; a spring 84 for biasing the main piston 52 toward the valve seat 44; and a coil 78 for giving attractive force to the plunger pin 72 by energization. The outer diameter of the plunger pin 72 is set to a dimension equal to or more than the inside diameter of the guide ring 82 in an external force-free state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic valve that allows a valve body integral with a plunger to be attached to and detached from a valve seat by energizing a coil.

  In a fuel supply system for storing fluid, for example, high-pressure gas (fuel gas) in a fuel tank, an electromagnetic valve is used to supply the high-pressure gas from the fuel tank while filling the fuel tank with the high-pressure gas. It has been.

  In general, this type of electromagnetic valve closes (closes) the fluid flow path by pressing a valve body through a spring against a valve seat provided in the fluid flow path. Then, the valve body is separated from the valve seat against the elastic force of the spring through the pressure of the fluid flowing through the fluid passage, thereby opening (opening) the fluid passage and opening the fluid tank into the fuel tank. Supplying fluid. On the other hand, by energizing the coil and separating the valve body integral with the plunger from the valve seat, the fluid in the fuel tank is led out to the fluid flow path.

  However, in the conventional solenoid valve, the opening and closing operation of the valve body is likely to occur frequently when the fluid rapidly flows when the valve is opened or when the pressure of the fluid and the elastic force of the spring antagonize. For this reason, there exists a problem that the sound by the vibration at the time of opening and closing of a valve body, ie, a vibration noise generate | occur | produces.

  Therefore, in order to obtain a valve that does not generate vibration noise, for example, a check valve disclosed in Patent Document 1 is known. As shown in FIG. 12, the check valve includes a valve housing 1 having a cylindrical shape, and a fluid passage 2 is formed in a shaft portion of the valve housing 1. A valve seat 3 is provided in the middle of the fluid passage 2, and a valve guide 4 is fixed in the valve housing 1.

  The valve guide 4 has a bottomed guide cylinder 4a, and a bottomed cylindrical portion 5a of the valve body 5 is slidably fitted (externally fitted) to the open side of the bottomed guide cylinder 4a. . The bottomed guide cylinder 4a and the bottomed cylindrical portion 5a form a pressure chamber 6, and this pressure chamber 6 has an air damper action, and a compression spring 7 is accommodated in the pressure chamber 6. ing. The distal end portion of the valve body 5 has a tapered shape corresponding to the valve seat 3 and is attached with an O-ring 8.

  In the check valve configured as described above, an air damper action is obtained by the pressure in the pressure chamber 6, so that a vibration phenomenon does not occur when the valve is opened, and noise due to vibration does not occur.

  Moreover, in the refrigerant | coolant piping vibration prevention apparatus currently disclosed by patent document 2, as shown in FIG. 13, while attaching the vibration prevention material attachment metal fitting 3b to the part of the electromagnetic valve coil 2b of the electromagnetic valve 1b, this vibration prevention A vibration preventing material 4b is wound around the material mounting bracket 3b.

  Thereby, while being able to suppress vibration of piping 5b via electromagnetic valve 1b, the above-mentioned vibration prevention material 4b is attached to the portion of electromagnetic valve coil 2b, and can suppress these vibrations, It is also possible to reduce unpleasant noise generated in the electromagnetic valve 1b.

JP 2001-99340 A JP 7-218042 A

  However, since the pressure chamber 6 is formed in the valve guide 4 and the valve body 5 in the above Patent Document 1, there is a problem that the structure is considerably complicated and the manufacturing cost of the check valve is increased. In addition, since the compression spring 7 is housed in the pressure chamber 6, the compression spring 7 itself is downsized, and there is a problem that the spring force is limited.

  Moreover, in said patent document 2, the vibration prevention material 4b is attached to the exterior of the electromagnetic valve 1b via the vibration prevention material attachment metal fitting 3b, and the whole apparatus will enlarge considerably. For this reason, the solenoid valve 1b cannot be arranged in a particularly narrow space, and there is a problem that versatility is lowered.

  The present invention solves this type of problem, and provides a solenoid valve that can prevent the occurrence of vibrations as much as possible with a compact and economical configuration and can satisfactorily suppress noise. The purpose is to do.

  A solenoid valve according to the present invention includes a body part provided with a fluid flow path, a valve seat provided in the body part in the middle of the fluid flow path, and a plunger having a valve body that can be seated on the valve seat A coil that is disposed on the outer periphery of the plunger portion and applies a suction force to the plunger portion by energization, and a pin portion that protrudes from the plunger portion in a direction in which the valve body is attached to and detached from the valve seat, A guide ring with a slit that contacts the inner wall portion of the body portion and surrounds the pin portion, and one end is supported by the guide ring with a slit, while the other end is supported by the plunger portion, And a spring that biases the valve seat.

  And before assembling a pin part and a guide ring with a slit, the outer diameter of the said pin part is set to the dimension more than the internal diameter of the said guide ring with a slit.

  The electromagnetic valve according to the present invention includes a body part provided with a fluid flow path, a valve seat provided in the body part in the middle of the fluid flow path, and a valve body seatable on the valve seat. A plunger portion that is disposed on an outer periphery of the plunger portion, and that applies a suction force to the plunger portion by energization, and a pin portion that protrudes from the body portion in a direction in which the valve body is attached to and detached from the valve seat. And a guide ring with a slit that abuts the inner wall portion of the plunger portion and surrounds the pin portion, one end is supported by the guide ring with a slit, and the other end is supported by the body portion, and the valve And a spring for urging the body toward the valve seat.

  And before assembling a pin part and a guide ring with a slit, the outer diameter of the said pin part is set to the dimension more than the internal diameter of the said guide ring with a slit.

  Furthermore, it is preferable that the guide ring with a slit has a ring part on which a spring is externally mounted, and the outer diameter of the ring part is set to a dimension equal to or larger than the inner diameter of the spring before assembly.

  Furthermore, it is preferable that the solenoid valve is mounted on a fuel tank, the fuel tank has a tank opening for introducing and discharging fuel, and the body portion is disposed inside the tank opening. .

  According to the present invention, before assembling the pin portion protruding from the plunger portion or the pin portion protruding from the body portion and the guide ring with slit, the outer diameter of the pin portion is larger than the inner diameter of the guide ring with slit. Is set to For this reason, when the valve body is opened and closed in a state where the guide ring with the slit is mounted on the pin portion, a radial force that brings them into contact with each other acts between the pin portion and the guide ring with the slit. A relatively large sliding resistance is generated.

  Therefore, the sliding resistance acts in the direction opposite to the vibration force of the valve body, and the dashpot effect is obtained. Thereby, it is possible to prevent the generation of vibrations as much as possible with a compact and economical configuration, and it is possible to satisfactorily suppress noise.

1 is a schematic explanatory diagram of a fuel supply system to which a solenoid valve according to a first embodiment of the present invention is applied. It is schematic structure explanatory drawing of the said solenoid valve. It is an enlarged view of the plunger pin, guide ring, and spring which comprise the said solenoid valve. It is a perspective explanatory view of the guide ring. It is front explanatory drawing of the said guide ring. It is explanatory drawing of the said spring. It is explanatory drawing at the time of filling hydrogen gas to a fuel tank. It is explanatory drawing at the time of the pilot valve supply which supplies hydrogen gas from the said fuel tank. It is explanatory drawing at the time of the main valve opening which supplies hydrogen gas from the said fuel tank. It is schematic structure explanatory drawing of the solenoid valve which concerns on the 2nd Embodiment of this invention. It is schematic structure explanatory drawing of the solenoid valve which concerns on the 3rd Embodiment of this invention. FIG. 6 is a cross-sectional explanatory view of a check valve disclosed in Patent Document 1. It is explanatory drawing of the solenoid valve disclosed by patent document 2. FIG.

  As shown in FIG. 1, the electromagnetic valve 10 according to the first embodiment of the present invention is incorporated in a fuel tank 14 constituting a fuel supply system 12. Although not shown, the fuel supply system 12 is mounted on a fuel cell vehicle.

  The electromagnetic valve 10 is attached to the tank opening 16 of the fuel tank 14, and one end of a pipe line 18 is connected to the tank opening 16. The other end of the pipe line 18 communicates with the pipe line 20. A check valve 24 is provided at one end of the pipeline 20 as a fuel supply port, and a fuel cell 28 is connected to the other end of the pipeline 20 via a pressure regulating valve 26. A nozzle for charging high-pressure hydrogen gas from the outside can be connected to the check valve 24.

  As shown in FIG. 2, the electromagnetic valve 10 includes a body portion 30. In the body portion 30, a male screw portion 32 formed on the outer periphery of the cylindrical portion is screwed into a female screw portion 34 formed on the inner peripheral surface of the tank opening 16 of the fuel tank 14. An O-ring 36 and a backup ring 38 are interposed between the outer peripheral portion of the body portion 30 and the inner peripheral wall surface of the tank opening 16.

  A hydrogen passage (fluid flow path) 40 is formed at the tip of the body portion 30. The hydrogen passage 40 extends in a radially inward direction from one end of the outer periphery of the large-diameter flange portion 42 provided at the distal end of the body portion 30 and then has a substantially L shape extending in the axial direction (arrow A1 direction). Composed. A valve seat 44 is provided at the inner end of the hydrogen passage 40, and a female screw portion 46 is provided on the inner wall surface connected to the valve seat 44. A main piston guide 48 is screwed into the female thread portion 46, and a main rubber 50 is interposed between the tip of the main piston guide 48 and the outer periphery of the valve seat 44.

  A main piston (valve element) 52 is detachably disposed on the valve seat 44 on the inner periphery of the main piston guide 48. A plurality of passages 54 are formed between the outer periphery of the main piston 52 and the inner periphery of the main piston guide 48. The passage 54 is substantially constituted by a slit formed on the inner wall surface of the main piston guide 48.

  A hole portion 56 is formed through the center of the main piston 52, and a cylindrical portion 58 is provided at the small diameter side end portion of the hole portion 56 so as to extend in the arrow A1 direction. A guide hole 60 is formed in the cylindrical portion 58 so as to penetrate in the axial direction. A pilot piston 62 is disposed in the cylindrical portion 58, and a pilot rubber (pilot valve body) 66 detachably attached to a pilot valve seat 64 constituting the main piston 52 is provided at the tip of the pilot piston 62. It is done.

  A pin 68 is press-fitted in the pilot piston 62 in the axial direction, and the pin 68 is loosely fitted in the guide hole 60 of the main piston 52 with a clearance, and is fitted to the tip of the plunger portion 70. . The plunger portion 70 has a plunger pin (pin portion) 72 protruding from the plunger portion 70 in the direction (arrow A1 direction) in which the main piston 52 is separated from the valve seat 44 at the end opposite to the main piston 52. Installed.

  The plunger pin 72 is movably disposed in a stepped hole 76 of a core 74 provided in the body portion 30, and the body 78 has a coil 78 positioned on the outer periphery of the plunger pin 72. Is provided.

  As shown in FIG. 3, on the large diameter portion side of the stepped hole portion 76, a guide ring 82 with a slit that abuts the inner wall 80 forming the large diameter portion side and surrounds the plunger pin 72, and one end Is supported by the guide ring 82, and the other end is supported by the plunger portion 70, and a spring 84 that biases the main piston 52 toward the valve seat 44 is disposed.

  The guide ring 82 is made of a resin material such as PTFE (polytetrafluoroethylene). As shown in FIGS. 4 and 5, the guide ring 82 includes a large-diameter flange portion 86 and a small-diameter ring portion 88 that is integrally formed with the flange portion 86 concentrically. The guide ring 82 includes a slit 90 that is cut out from the flange portion 86 to the ring portion 88 and extends in the axial direction. The diameter of the guide ring 82 can be expanded and contracted through the slit 90.

  The inner peripheral surface 92 of the guide ring 82 is set to an inner diameter D1 in a state where no external force is applied to the guide ring 82, for example, a state before assembly, and the ring portion 88 is similarly in a state before assembly. The outer diameter D2 is set.

  As shown in FIG. 3, the plunger pin 72 to which the guide ring 82 is attached has a diameter D3, and this diameter D3 is set to a dimension equal to or larger than the inner diameter D1 of the guide ring 82 (D1 ≦ D3, Preferably, D1 <D3).

  As shown in FIG. 6, the inner diameter D4 of the spring 84 is set before assembly, that is, in a state where no external force is applied. The inner diameter D4 is set to be smaller than the outer diameter D2 of the ring portion 88 constituting the guide ring 82 (D2 ≧ D4, more preferably D2> D4).

  As shown in FIG. 2, the body portion 30 is formed with a port 96 that communicates the inside of the fuel tank 14 with the passage 54 of the main piston guide 48. A lead wire 98 is connected to the coil 78, and the lead wire 98 is taken out from the flange portion 42 and connected to a power source (not shown) (for example, 12 V power source).

  The operation of the electromagnetic valve 10 configured as described above will be described below in relation to the fuel supply system 12.

  First, when the fuel tank 14 is filled with high-pressure fuel gas (for example, hydrogen gas), the high-pressure hydrogen gas filling nozzle is connected to the check valve 24, while the pressure regulating valve 26 is closed, and the pipe line High-pressure hydrogen gas is supplied from 20 to the pipe 18. Hydrogen gas is introduced into the hydrogen passage 40 provided in the body portion 30 of the electromagnetic valve 10 and presses the main piston 52 in the direction of the arrow A1.

  For this reason, as shown in FIG. 7, the main piston 52 moves in the direction of the arrow A1 due to the pressure difference between the pressure inside the fuel tank 14 and the pressure of the hydrogen to be filled. Accordingly, the pin 68 loosely fitted in the guide hole 60 of the main piston 52 is pressed against the inner wall surface of the guide hole 60, and the plunger portion 70 integrated with the pin 68 opposes the elastic force of the spring 84, and the arrow A1. Move in the direction. As a result, the main piston 52 is detached from the valve seat 44 and the main valve is opened, and the fuel tank 14 is filled with hydrogen gas from the hydrogen passage 40 through the port 96.

  In this case, in the first embodiment, the diameter D3 of the plunger pin 72 is set to a dimension equal to or larger than the inner diameter D1 of the guide ring 82 in a state where no external force is applied to the guide ring 82 (before assembly). Yes. For this reason, in the state where the guide ring 82 is interposed in the plunger pin 72, a radial force that makes the plunger pin 72 and the guide ring 82 come into contact with each other is acting.

  Accordingly, when the main piston 52 moves in the radial direction (arrow A1 direction), a relatively large sliding resistance is generated between the plunger pin 72 and the guide ring 82.

  Thereby, the sliding resistance is produced in the direction opposite to the vibration force of the main piston 52, and the dashpot effect is obtained. For this reason, the solenoid valve 10 can prevent the occurrence of vibrations as much as possible with a simple and economical configuration, and can effectively suppress noise.

  Next, when the fuel tank 14 is filled with hydrogen gas and the pressure difference between the pressure inside the fuel tank 14 and the pressure of the hydrogen supplied to the hydrogen passage 40 decreases, or the hydrogen gas to the pipe 20 When the supply is stopped, the main piston 52 moves in the direction of arrow A2 (opposite to the direction of arrow A1) under the elastic action of the spring 84.

  Accordingly, the main piston 52 is seated on the valve seat 44 and is closed. At that time, a relatively large vibration resistance is generated between the plunger pin 72 and the guide ring 82, the vibration is suppressed, and the generation of noise can be prevented as much as possible.

  Furthermore, in the first embodiment, the spring 84 has an inner diameter D4 set before assembly, that is, in a state where no external force is applied, and this inner diameter D4 is the outer shape of the ring portion 88 constituting the guide ring 82. The dimension is set smaller than D2. For this reason, in a state where the electromagnetic valve 10 is assembled, the spring 84 is externally mounted on the outer periphery of the ring portion 88 of the guide ring 82 in a predetermined state.

  Here, since a radial force that makes contact between the ring portion 88 and the spring 84 works, when the main piston 52 is opened and closed, between the ring portion 88 that constitutes the guide ring 82 and the spring 84, A relatively large sliding resistance is generated. This makes it possible to reliably generate a sliding resistance between the guide ring 82 and the spring 84 even when the elastic force of the guide ring 82 itself is reduced due to aging. For this reason, generation | occurrence | production of the vibration of the main piston 52 can be prevented as much as possible, and it becomes possible to suppress a noise favorably.

  Next, when supplying hydrogen gas from the fuel tank 14 to the fuel cell 28, energization of the coil 78 is started via the lead wire 98 as shown in FIG. 8. Accordingly, the plunger pin 72 moves in the direction of the arrow A <b> 1 via the suction force generated in the coil 78. The plunger pin 72 is fixed to the plunger portion 70, and a pin 68 is press-fitted into the plunger portion 70. As a result, the pilot piston 62 moves in the direction of the arrow A1, and the pilot rubber 66 provided on the pilot piston 62 is detached from the pilot valve seat 64 and opened.

  Therefore, the hydrogen gas in the fuel tank 14 is led out from the port 96 to the hydrogen passage 40 through the passage 54 and the hole 56 of the main piston 52. Then, when the internal pressure of the fuel tank 14 and the pressure of the hydrogen passage 40 are equalized, the plunger pin 72, the plunger portion 70 and the pin 68 are interposed under the suction action of the coil 78 as shown in FIG. Thus, the main piston 52 moves in the arrow A1 direction.

  Accordingly, the main piston 52 is released from the valve seat 44 and opened, and the hydrogen gas in the fuel tank 14 is led to the hydrogen passage 40 through the port 96 and the passage 54. As shown in FIG. 1, the hydrogen gas led out to the hydrogen passage 40 is introduced into the pipe line 20, and is supplied as a fuel gas to the fuel cell 28 under the pressure-reducing action of the pressure regulating valve 26. Power generation is performed.

  In the first embodiment, the guide ring 82 is made of PTFE resin. However, the guide ring 82 is not limited to this, and other resin, rubber, metal, or the like may be used. The same applies to the second and subsequent embodiments described below.

  FIG. 10 is an explanatory diagram of a schematic configuration of the solenoid valve 100 according to the second embodiment of the present invention.

  In addition, the same referential mark is attached | subjected to the component same as the solenoid valve 10 which concerns on 1st Embodiment, and the detailed description is abbreviate | omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

  The solenoid valve 100 includes a plunger portion 102, and the plunger portion 102 has an end opposite to the main piston 52 in the direction in which the main piston 52 is separated from the valve seat 44 (arrow A1 direction). A pin portion 104 protruding from the portion 102 is integrally formed.

  In the second embodiment configured as described above, the pin portion 104 is integrally formed with the plunger portion 102, so that the number of parts is reduced and the same effects as in the first embodiment can be obtained.

  FIG. 11 is an explanatory diagram of a schematic configuration of a solenoid valve 110 according to the third embodiment of the present invention.

  The body portion 30 constituting the electromagnetic valve 110 is provided with a core 112, and a pin portion 114 is attached to the tip convex portion of the core 112. The pin part 114 is disposed in a stepped hole part 118 provided in the plunger part 116 so as to freely advance and retract.

  On the large-diameter portion side of the stepped hole portion 118, a guide ring 82 with a slit that contacts the inner wall surface 120 that forms the large-diameter portion side and surrounds the pin portion 114, and one end is supported by the guide ring 82. On the other hand, the other end is supported by the core 112, and a spring 84 that biases the main piston 52 toward the valve seat 44 is disposed.

  In the third embodiment configured as described above, the diameter of the pin portion 114 is set to a dimension equal to or larger than the inner diameter of the guide ring 82 in a state where no external force is applied to the guide ring 82 (before assembly). ing. For this reason, the electromagnetic valve 110 can prevent the occurrence of vibration as much as possible with a simple and economical configuration, and can suppress the noise satisfactorily. The same effect as in the embodiment can be obtained.

  Further, in the third embodiment, the pin portion 114 is attached to the tip convex portion of the core 112, but instead of this, the pin portion 114 is connected to the core 112 as in the second embodiment. You may integrally mold to a front-end | tip convex part.

  In addition, this invention is not limited to the 1st-3rd embodiment, In the range which does not deviate from this invention, it can implement with a various form.

DESCRIPTION OF SYMBOLS 10, 100, 110 ... Solenoid valve 12 ... Fuel supply system 14 ... Fuel tank 16 ... Tank opening 18, 20 ... Pipe line 28 ... Fuel cell 30 ... Body part 40 ... Hydrogen passage 42, 86 ... Flange part 44 ... Valve seat 48 ... Main piston guide 50 ... Main rubber 52 ... Main piston 54 ... Passage 56, 76 ... Hole 58 ... Cylinder 60 ... Guide hole 62 ... Pilot piston 64 ... Pilot valve seat 66 ... Pilot rubber 68 ... Pins 70, 102, 116 ... plunger part 72 ... plunger pin 74, 112 ... core 78 ... coil 80, 120 ... inner wall surface 82 ... guide ring 84 ... spring 88 ... ring part 90 ... slit 104,114 ... pin part

Claims (4)

A body part provided with a fluid flow path;
A valve seat provided in the body portion in the middle of the fluid flow path;
A plunger portion having a valve body seatable on the valve seat;
A coil that is disposed on the outer periphery of the plunger portion and applies a suction force to the plunger portion by energization;
A pin portion protruding from the plunger portion in a direction in which the valve body is attached to and detached from the valve seat;
A guide ring with a slit that abuts on the inner wall portion of the body portion and surrounds the pin portion;
One end is supported by the guide ring with a slit, the other end is supported by the plunger portion, and a spring that biases the valve body toward the valve seat side,
With
Before assembling the pin portion and the guide ring with slit, the outer diameter of the pin portion is set to a dimension equal to or larger than the inner diameter of the guide ring with slit. A body part provided with a fluid flow path;
A valve seat provided in the body portion in the middle of the fluid flow path;
A plunger portion having a valve body seatable on the valve seat;
A coil that is disposed on the outer periphery of the plunger portion and applies a suction force to the plunger portion by energization;
A pin portion protruding from the body portion toward a direction in which the valve body is attached to and detached from the valve seat;
A guide ring with a slit that contacts the inner wall of the plunger and surrounds the pin;
One end is supported by the guide ring with a slit, the other end is supported by the body portion, and a spring that biases the valve body toward the valve seat side,
With
Before assembling the pin portion and the guide ring with slit, the outer diameter of the pin portion is set to a dimension equal to or larger than the inner diameter of the guide ring with slit. The solenoid valve according to claim 1 or 2, wherein the guide ring with a slit has a ring portion on which the spring is sheathed,
The outer diameter of the ring part is set to a dimension equal to or larger than the inner diameter of the spring before assembly. The solenoid valve according to any one of claims 1 to 3, wherein the solenoid valve is attached to a fuel tank,
The solenoid valve according to claim 1, wherein the fuel tank has a tank opening for introducing and discharging fuel, and the body portion is disposed inside the tank opening.

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