JP2007327613A - Valve sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve sealing structure that prevents breakage of a rubber-like elastic body 2 while suppressing the occurrence of a protrusion phenomenon in the rubber-like elastic body in the valve sealing structure in which a rigid component 1, the rubber-like elastic body 2, and a rigid member 3 are brought into contact with each other or separated from each other in accordance with valve opening/closing operation. <P>SOLUTION: The valve sealing structure has a structure in which the rigid member 3 is brought into contact with the rigid component 1 before a seal part 2a of the rubber-like elastic body 2 is brought into contact with the rigid component 1 or almost simultaneously with the contact between the seal part and the rigid component during valve closing operation. The rubber-like elastic body 2 is held by a pressing member 4 that is displaced relative to the rigid member 3 after the contact of the rigid member 3 so as to press the rubber-like elastic body 2 against the rigid component 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a valve seal structure in which a pair of seal elements come in contact with and separate from each other in accordance with the opening and closing operation of the valve. The seal structure of the present invention is used, for example, in an opening / closing operation part of a high pressure gas valve for a fuel cell.

  In the conventional valve device 51 shown in FIG. 10, when the valve is closed, the valve body 52 sequentially contacts the rubber lip (outer seal portion) 53 and the metal portion (inner seal portion) 54 as shown in FIG. That is, it is configured such that it first contacts the rubber lip 53 and then contacts the metal portion 54.

  However, according to this structure, as the gas pressure to be sealed increases, the rubber lip 53 is pushed by the pressure and deforms to cause a protrusion phenomenon. Therefore, as shown in FIG. And the metal part 54 may be damaged.

JP-A-9-150728

  In view of the above, the present invention provides a valve seal structure that can suppress the occurrence of a protrusion phenomenon in a rubber-like elastic body constituting one sealing element, and can prevent the damage. For the purpose.

  In order to achieve the above object, a seal structure according to claim 1 of the present invention is a valve seal structure in which a rigid component, a rubber-like elastic body, and a rigid member are brought into contact with and separated from each other in accordance with the opening / closing operation of the valve. It is characterized in that the rigid member abuts against the rigid component substantially at the same time as or before the seal portion of the rubber-like elastic body abuts against the rigid component when the valve is operated. .

  The seal structure according to claim 2 of the present invention is the seal structure according to claim 1, wherein the rubber-like elastic body is relatively displaced with respect to the rigid member after contact with the rigid member. Is held by a pressing member that presses against a rigid component.

  The seal structure according to claim 3 of the present invention is the seal structure according to claim 1, wherein the rubber-like elastic body has a shape that is pressed against the rigid component by being pressed by the pressure after the rigid member abuts. It is characterized by that.

  The seal structure according to claim 4 of the present invention is the seal structure according to claim 1, 2, or 3, wherein the rigid part forms a valve body of the valve, and the rubber-like elastic body and the rigid member are the valve valve. It is characterized by forming a seat.

  Furthermore, the seal structure according to claim 5 of the present invention is the seal structure according to claim 1, 2, or 3, wherein the rigid part forms the valve body of the valve, and the rubber-like elastic body and the rigid member are the valve body. A valve seat is formed.

  In the above prior art, as the gas pressure to be sealed is increased, the rubber lip is pushed by the pressure and deforms, and the protrusion phenomenon occurs because the valve body contacts the rubber lip when the valve is closed. This is because the rubber lip is pushed by the pressure until the valve body comes into contact with the metal part, so that there is enough time to protrude. On the other hand, in the seal structure according to claim 1 of the present invention, the rigid member contacts the rigid component substantially at the same time as or before the seal portion of the rubber-like elastic body contacts the rigid component when the valve is closed. Since the rubber-like elastic body is pressed by pressure and does not have a time allowance to protrude, there is no allowance, so that the protrusion can be suppressed.

  However, if the structure is such that the rigid member abuts against the rigid component before or at the same time as the seal portion of the rubber-like elastic body abuts against the rigid component, the rubber-like elastic body does not strongly contact the rigid component. Therefore, there is a concern that the sealing performance becomes unstable. Accordingly, in claim 2 of the present invention, the rubber-like elastic body is held by a pressing member that is displaced relative to the rigid member after abutment of the rigid member and presses the rubber-like elastic body against the rigid component. Therefore, the rubber-like elastic body is in close contact with the rigid component. According to a third aspect of the present invention, the rubber-like elastic body has a structure in which the rubber-like elastic body is pressed against the rigid component by being pressed by the pressure after contact with the rigid member, and the rubber-like elastic body is in close contact with the rigid component by this self-sealing action. The configuration. Therefore, according to these, sufficient rubber sealability is ensured.

  As shown in the embodiments described later, the rigid part forms the valve body of the valve, and the rubber-like elastic body and the rigid member form the valve seat of the valve (Claim 4). On the contrary, the rigid part is the valve seat of the valve. The rubber-like elastic body and the rigid member may form the valve body of the valve (claim 5).

  The present invention has the following effects.

  That is, in the seal structure according to claim 1 of the present invention, as described above, the rigid member is rigid at substantially the same time as or before the seal portion of the rubber-like elastic body abuts against the rigid component when the valve is closed. Since the rubber-like elastic body is pressed by pressure and does not have a time allowance to protrude from the contact with the component, it is possible to suppress the protrusion. Therefore, it is possible to suppress the occurrence of the protrusion phenomenon in the rubber-like elastic body, and thus it is possible to prevent the damage.

  In addition to this, in the seal structure according to claim 2 of the present invention, the pressing member is relatively displaced with respect to the rigid member after the rigid member abuts, and the rubber-like elastic body is pressed against the rigid component. Since the rubber-like elastic body is in close contact with the rigid component, it is possible to exhibit a sufficient rubber sealing property. Therefore, according to the first aspect of the present invention, it is possible to provide a seal structure that can prevent the rubber-like elastic body from protruding and breakage and that exhibits excellent sealing performance.

  In the sealing structure according to claim 3 of the present invention, the rubber-like elastic body is pressed against the rigid part by being pressed by the pressure after the rigid member is brought into contact, whereby the rubber-like elastic body is strongly attached to the rigid part. The close contact makes it possible to exhibit a sufficient rubber sealing property. Therefore, according to the first aspect of the present invention, it is possible to provide a seal structure that can prevent the rubber-like elastic body from protruding and breakage and that exhibits excellent sealing performance.

  According to claim 4 of the present invention, the present invention can be applied to a valve of a type in which a rigid part is a valve body of a valve and a rubber-like elastic body and a rigid member are valve seats of the valve. The effects of the first to third aspects can be obtained for each type of valve.

  Furthermore, according to claim 5 of the present invention, on the contrary, the present invention can be applied to a valve of a type in which a rigid part is a valve seat of a valve and a rubber-like elastic body and a rigid member are valve bodies of the valve. In this type of valve, the effects of the first to third aspects can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1 shows a valve seal structure according to a first embodiment of the present invention.

  The seal structure according to this embodiment is such that the valve body made of the rigid component 1 contacts and separates from the valve seat made of the rubber-like elastic body 2 and the rigid member 3 in accordance with the opening / closing operation of the valve. The rigid member 3 contacts the rigid component 1 before the seal portion 2a of the rubber-like elastic body 2 contacts the rigid component 1 during operation. The rubber-like elastic body 2 is held by a pressing member 4 that is displaced relative to the rigid member 3 after the rigid member 3 is abutted and presses the rubber-like elastic body 2 against the rigid component 1.

  The rigid component 1 is formed of a rigid material such as metal or hard resin, and has an abutting surface 1a having a planar shape perpendicular to the axis. The rigid member 3 is formed in a disc shape by a rigid material such as metal or hard resin, and has a contact surface 3a having a plane perpendicular to the axis. An annular rubber elastic body 2 is vulcanized and bonded to the outer peripheral side and back surface (lower surface in the figure) of the rigid member 3, and metal or hard resin or the like is attached to the outer peripheral side and back side of the rubber elastic body 2. An annular pressing member 4 made of a rigid material is bonded.

  A bead-shaped or lip-shaped seal portion 2a is provided on the front surface (upper surface in the drawing) of the rubber-like elastic body 2 to be in close contact with the contact surface 1a of the rigid component 1 when the valve is closed. As shown in FIG. 2, when the contact surface 1a of the rigid component 1 and the contact surface 3a of the rigid member 3 contact each other, the seal portion 2a does not reach the contact surface 1a of the rigid component 1 yet. It is set not to touch.

  The pressing member 4 has, in addition to the holding portion 4b that holds the rubber-like elastic body 2, a contact surface 4a that is a plane perpendicular to the axis on the front surface. As shown in FIG. 2, the contact surface 4a of the pressing member 4 is contacted with the contact surface 1a of the rigid component 1 when the contact surface 1a of the rigid component 1 and the contact surface 3a of the rigid member 3 contact each other. 2 is set so as not to reach yet, and in the state of FIG. 2, when a pressure of a predetermined magnitude acts on the pressing member 4 from the back side, the pressing member 4 is rigid as shown in FIG. Displacement toward the component 1 is set so that the contact surface 4 a is brought into contact with the contact surface 1 a of the rigid component 1. At this time, the pressing member 4 is relatively displaced with respect to the rigid member 3 already in contact with the rigid component 1 and presses the seal portion 2 a of the rubber-like elastic body 2 against the contact surface 1 a of the rigid component 1.

Incidentally, the pressure-receiving area of the floating structure for, consisting of the pressing member 4 and the rubber-like elastic body 2 to allow this movement, towards the rear side pressure-receiving area S ₂ is set larger than its front-side pressure-receiving area S ₁ (S ₁ <S ₂ ).

FIG. 1 shows a valve open state, in which high pressure gas flows from the high pressure side space H to the low pressure side space L. When the valve is closed from this open state and the rigid component 1 as the valve body is displaced downward in the figure, the rigid component 1 comes into contact with the rigid member 3 and stops as shown in FIG. At this time, since the seal portion 2a and the pressing member 4 of the rubber-like elastic body 2 are not yet in contact with the rigid component 1, the seal portion 2a is sandwiched between the rigid component 1 and the rigid member 3 due to the protrusion phenomenon and is not damaged. Absent. When the rigid component 1 comes into contact with the rigid member 3 and stops, the pressure member 4 is displaced toward the rigid component 1 by the pressure due to the difference between the pressure receiving areas S ₁ and S ₂ , and the rigid component 1 is moved to the rigid component 1 as shown in FIG. Stops in contact. At this time, as described above, the pressing member 4 is relatively displaced with respect to the rigid member 3 already in contact with the rigid component 1, and presses the seal portion 2a of the rubber-like elastic body 2 against the contact surface 1a of the rigid component 1. As a result, rubber sealability is exhibited. Therefore, the rubber-like elastic body 2 can be prevented from being damaged due to the protrusion as described above, and sufficient sealing performance can be exhibited.

Second embodiment ...
The rubber-like elastic body 2 may be set as shown in FIG. 4, that is, the rubber volume may be increased to increase the pop-out amount of the seal portion 2a. Moreover, as shown in the figure, the contact surface 4a of the pressing member 4 can be omitted.

Third embodiment ...
In the first embodiment (FIG. 1), the abutment surfaces 1a, 2a, 3a of the rigid component 1, the rubber-like elastic body 2 and the rigid member 3 are set in a plane shape perpendicular to the axis. As shown in FIGS. 5 to 7, each may be set to a corresponding conical surface shape.

Fourth embodiment ...
FIG. 8 shows a valve seal structure according to a fourth embodiment of the present invention.

  The seal structure according to this embodiment is such that the valve body made of the rigid component 1 contacts and separates from the valve seat made of the rubber-like elastic body 2 and the rigid member 3 in accordance with the opening / closing operation of the valve. At the time of operation, the seal portion 2a of the rubber-like elastic body 2 is in contact with the rigid component 1 and at the same time the rigid member 3 is in contact with the rigid component 1. The rubber-like elastic body 2 has a shape that is pressed against the rigid component 1 by being pressed by pressure after the rigid member 3 is brought into contact therewith.

  The rigid component 1 is formed of a rigid material such as metal or hard resin, and has an abutting surface 1a having a planar shape perpendicular to the axis. The rigid member 3 is formed into a disk shape by a rigid material such as metal or hard resin, and has a contact surface 3a having a plane perpendicular to the axis at the tip of an annular protrusion 3b provided on the front surface thereof. Annular rubber-like elastic bodies 2 are vulcanized and bonded to the outer peripheral side and the inner peripheral side of the annular protrusion 3b on the front surface of the rigid member 3, respectively. The rubber-like elastic body 2 has a contact surface 2b having a plane perpendicular to the axis and a pressure receiving surface 2c having an undercut shape.

  FIG. 8 shows a valve open state, in which high pressure gas flows from the high pressure side space H to the low pressure side space L. When the valve is closed from this open state and the rigid component 1 which is the valve body is displaced downward in the figure, the rigid component 1 comes into contact with the rigid member 3 and the rubber-like elastic body 2 as shown in FIG. And stop. At this time, since the rubber-like elastic body 2 contacts the rigid component 1 simultaneously with the rigid member 3, the rubber-like elastic body 2 is not sandwiched between the rigid component 1 and the rigid member 3 and is not damaged. In addition, after the contact, the rubber-like elastic body 2 is pressed against the rigid component 1 by the pressure acting on the pressure-receiving surface 2c, so that the rubber sealing property is exhibited. Therefore, the rubber-like elastic body 2 can be prevented from being damaged due to the protrusion as described above, and sufficient sealing performance can be exhibited.

  In the above embodiment, the rubber-like elastic body 2 having a symmetrical structure is also provided on the inner peripheral side of the annular protrusion 3b in preparation for the case where pressure is applied from the inner peripheral side of the annular protrusion 3b when the valve is closed. However, in the case where the action direction of the pressure is predetermined, the rubber-like elastic body 2 may be provided only on either the outer peripheral side or the inner peripheral side of the annular protrusion 3b.

  Further, as shown in the figure, when the rubber-like elastic body 2 is provided on both the outer peripheral side and the inner peripheral side of the annular protrusion 3b, these may be integrally formed. In this case, the rubber-like elastic bodies 2 on the outer peripheral side and the inner peripheral side are connected to each other by a thin film-like connecting portion that is attached to the tip of the annular protrusion 3b. A communication hole penetrating in the direction may be provided, and the rubber-like elastic body 2 may be integrated through the through hole.

  Furthermore, in each of the above embodiments, the rigid component 1 forms the valve body of the valve, and the rubber-like elastic body 2 and the rigid member 3 form the valve seat of the valve. A valve seat may be formed, and the rubber-like elastic body 2 and the rigid member 3 may form a valve body of the valve. In this case, the rubber-like elastic body 2 and the rigid member 3 advance and retreat with respect to the rigid component 1.

Sectional drawing which shows the valve open state of the seal structure which concerns on 1st Example of this invention. Sectional drawing which shows the state at the time of valve closing operation of the seal structure Sectional view showing the valve closed state of the seal structure Sectional drawing of the principal part of the seal structure which concerns on 2nd Example of this invention. Sectional drawing which shows the valve open state of the seal structure which concerns on 3rd Example of this invention. Sectional drawing which shows the state at the time of valve closing operation of the seal structure Sectional view showing the valve closed state of the seal structure Sectional drawing which shows the valve open state of the seal structure which concerns on 4th Example of this invention. Sectional view showing the valve closed state of the seal structure Sectional view of a valve device according to a conventional example Sectional view of the seal structure provided in the valve device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rigid parts 1a, 2b, 3a, 4a Contact surface 2 Rubber-like elastic body 2a Seal part 2c Pressure receiving surface 3 Rigid member 4 Pressing member 4b Holding part H High pressure side space L Low pressure side space

Claims (5)

In the valve seal structure in which the rigid component, the rubber-like elastic body, and the rigid member are brought into contact with and separated from each other in accordance with the opening / closing operation of the valve,
The valve has a structure in which the rigid member abuts on the rigid component substantially at the same time as or before the seal portion of the rubber-like elastic body abuts on the rigid component when the valve is closed. Seal structure. The seal structure according to claim 1,
The valve-like seal structure is characterized in that the rubber-like elastic body is held by a pressing member that is displaced relative to the rigid member after the rigid member abuts and presses the rubber-like elastic body against the rigid component. The seal structure according to claim 1,
The rubber-like elastic body has a shape that is pressed by pressure after being brought into contact with the rigid member and pressed against the rigid component. The seal structure according to claim 1, 2, or 3,
A valve sealing structure, wherein the rigid part forms a valve body of the valve, and the rubber-like elastic body and the rigid member form a valve seat of the valve. The seal structure according to claim 1, 2, or 3,
A valve sealing structure, wherein the rigid part forms a valve seat of the valve, and the rubber-like elastic body and the rigid member form the valve body of the valve.

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