JP2015102132A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide seal structure capable of successfully maintaining a seal state and suppressing leakage of fluid even in a low temperature state.SOLUTION: The present invention provides seal structure 2 for sealing between a first surface 6b of a first mechanical component 6 and a second surface 10b of a second mechanical component 10. The seal structure 2 has: a seal member 16 made of a resin material and including a first seal end 16a, a second seal end 16b, and an intermediate part which extends between the first seal end 16a and the second seal end 16b so that a space is formed between the first seal end 16a and the second seal end 16b; a first deformation suppression member 18 arranged in the space, for suppressing deformation of the seal member 16 and formed from first metal; and spring members 22, 24 for energizing the first seal end 16a to the first surface 6b and energizing the second seal end 16b to the second surface 10b, and a thermal expansion coefficient of the first metal is lower than a thermal expansion coefficient of the resin material.

Description

  The present invention relates to a seal structure, and more particularly to a seal structure for preventing a low-temperature fluid from leaking well.

  As a conventional fluid seal structure, a packing, an O-ring and the like are known.

  However, in an environment where a low-temperature fluid such as about -196 ° C. flows, there is a problem that the O-ring or the like is cured and the sealing performance is deteriorated.

  In addition, for example, it is conceivable to employ a resin seal member that is hard to be cured at a low temperature such as about −196 ° C. However, since the resin seal member has a relatively high linear expansion coefficient (thermal expansion coefficient), there is a problem that the resin seal member contracts and deforms in a low temperature state, resulting in a decrease in sealing performance.

  The present invention has been made in order to solve the above-described problems of the prior art, and in particular, has a sealing structure that can exhibit sealing performance even in a low temperature state and can satisfactorily suppress fluid leakage. It is intended to provide.

  In order to achieve the above object, the present invention seals a gap between a first surface of a first machine component and a second surface of a second machine component facing the first surface. A first seal end portion extending along a first surface, a second seal end portion extending along a second surface, a first seal end portion and a second seal end portion A seal member made of a resin material including an intermediate portion extending between the first seal end and the second seal end so that a space is formed between the seal member and the seal member disposed in the space The first deformation suppression member formed of the first metal for suppressing the deformation of the metal, between the first deformation suppression member and the first seal end, and the first deformation suppression member and the second seal end. The first seal end portion and the second seal end portion are respectively attached to the first surface and the second surface. And a spring member for the linear expansion coefficient of the first metal is characterized in that less than the linear expansion coefficient of the resin material.

  In the present invention configured as described above, when the gap between the first surface and the second surface is sealed, the first deformation suppressing member that has relatively little deformation due to a temperature change due to the temperature of the fluid is provided. Since it is disposed between the first seal end and the second seal end, particularly in the low temperature state, the inside of the gap between the first seal end and the second seal end (the direction away from the surface to be sealed) ) Is suppressed, and contact with the first surface of the first seal end portion and the second surface of the second seal end portion is maintained. Can be maintained, and fluid leakage can be suppressed.

In the present invention, preferably, the seal member is substantially U-shaped with the first seal end portion, the second seal end portion, and the intermediate portion, and the seal structure further includes an outer peripheral surface of the intermediate portion. Is provided with a second deformation suppression member for suppressing deformation of the intermediate portion, the second deformation suppression member is formed of a second metal, and the linear expansion coefficient of the second metal is It is lower than the linear expansion coefficient of the resin material. In the present invention configured as described above, the intermediate portion of the seal member is held by the second deformation suppressing member, so that deformation due to contraction of the intermediate portion of the seal member is suppressed particularly in a low temperature state. The sealing state can be maintained well even in the state, and when the substantially U-shaped sealing member is mounted in the opening direction toward the high pressure side, the sealing member is moved to the low pressure side due to receiving pressure. The deformation of the fluid is suppressed, and the leakage of fluid can be suppressed.
In the present invention, since the second deformation suppressing member has a width dimension smaller than the width dimension of the gap, in the present invention configured as described above, the first surface of the first machine component and the second machine In the structure that moves relative to the second surface of the component, relative movement between the first surface of the first machine component and the second surface of the second machine component is allowed, and second deformation suppression is performed. Wear between the member and the first surface and the second surface can be prevented. Furthermore, according to the seal structure of the present invention, the seal member can be easily mounted in the gap between the first surface and the second surface.

  In the present invention, preferably, the seal member has a recess formed on a surface facing the second deformation suppression member, and the second deformation suppression member protrudes into the recess and is It has a lock part to lock. In the present invention configured as described above, since the seal member is locked with respect to the second deformation suppressing member, the sliding friction between the first surface of the first mechanical component and the first seal end, the second It is possible to prevent the seal member from separating from the second deformation suppressing member due to the sliding friction between the second surface of the mechanical part and the second seal end.

  In the present invention, preferably, the linear expansion coefficient of the metal forming the first deformation suppressing member is not more than one third of the linear expansion coefficient of the resin forming the sealing member. According to the present invention configured as described above, the deformation due to the contraction of the sealing member can be further satisfactorily suppressed by the first deformation suppressing member, and the sealing ability can be maintained even in a low temperature state.

  In the present invention, preferably, the linear expansion coefficient of the metal forming the second deformation suppressing member is not more than one third of the linear expansion coefficient of the resin forming the seal member. According to the present invention configured as described above, the deformation due to the contraction of the sealing member can be further satisfactorily suppressed by the second deformation suppressing member, and the sealing ability can be maintained even in a low temperature state.

  According to the seal structure of the present invention, the sealing performance can be satisfactorily exhibited even at a low temperature, and fluid leakage can be suppressed.

It is sectional drawing which shows the structure of the unmounted state of the seal structure by embodiment of this invention. It is a schematic fragmentary sectional view which shows roughly the mounting state to the valve | bulb of the seal structure by embodiment of this invention. FIG. 3 is an enlarged cross-sectional view of a portion B showing a mounting portion of the seal structure 2 according to the embodiment of the present invention shown in FIG.

  Hereinafter, a seal structure according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a structure of a seal structure in an unmounted state according to an embodiment of the present invention. FIG. 2 is a schematic partial cross-sectional view schematically showing a state where the seal structure according to the embodiment of the present invention is attached to a valve. 3 is an enlarged cross-sectional view of a portion B showing a mounting portion of the seal structure 2 according to the embodiment of the present invention shown in FIG.

  The seal structure 2 according to the embodiment of the present invention shown in FIG. 1 can be attached to the valve 1 shown in FIG. Hereinafter, the case where the seal structure 2 shown in FIG. 1 is attached to the valve 1 will be described. Needless to say, the seal structure 2 can be used not only for the valve 1 but also for other devices that need to seal fluid. Yes.

  First, the structure of the valve 1 to which the seal structure 2 according to the embodiment of the present invention shown in FIG. 1 can be mounted will be described with reference to FIG. A valve 1 shown in FIG. 2 is connected to a fluid conduit (not shown), and is a ball valve for performing outflow, closing, and adjustment of the outflow amount of a gas or liquid fluid F pumped in the conduit. is there. FIG. 2 shows only a portion of the cross section of the valve 1 on the upper side with respect to the central axis AA of the valve 1 and on the inlet side 1a of the fluid F, and the entire structure is omitted. Are symmetrical with respect to the central axis AA.

  Each of the inlet 1 a and the outlet (not shown) of the valve 1 shown in FIG. 2 is connected to a conduit (not shown) that pumps the fluid F. Inside the valve 1, a housing 6 in which a flow path 4 in fluid communication with a conduit is formed, a ball valve body 8 which is disposed in the housing 6 and opens and closes the flow path 4, and is disposed in the housing 6, A valve seat 10 that supports the ball valve body 8 at a predetermined position, and a support spring 12 that is interposed between the valve seat 10 and the housing 6 and biases the valve seat 10 against the ball valve body 8. The support spring 12 is a compression coil spring.

  A play space 14 is formed between the valve seat 10 and the housing 6, and the valve seat 10 is movable relative to the housing 6 so that the ball valve body 8 is positioned at a predetermined position. is there. Steps are formed on the inner surface of the housing 6 and the outer surface of the valve seat 10 facing the housing 6, and a support spring 12 is mounted in a space 11 formed between the step portions. The ball spring 8 is biased by the support spring 12.

  In the vicinity of the inlet 1a of the valve 1, a step portion is formed around the central axis AA on each of the outer surface 10a of the valve seat 10 and the inner surface 6a of the housing 6 facing the valve seat 10, and a gap between them is formed. In G, the seal structure 2 is arranged. More specifically, the gap G is formed between the housing surface 6b on the housing 6 side and the valve seat surface 10b on the valve seat 10 side facing the housing surface 6b, and between the housing surface 6b and the valve seat surface 10b. The seal structure 2 is disposed between them so that the high-pressure fluid F does not leak into the outside air space 11 on the low-pressure side, and the space between them is sealed. FIG. 2 shows one cross section cut along the radial direction from the center of the ring of the seal structure 2 (the same applies to FIGS. 1 and 3), but the gap G is centered on the central axis AA. The seal structure 2 is an annular shape centered on the central axis AA.

  The fluid F may be a cryogenic fluid, for example, a liquid of chemicals such as liquid nitrogen (about −196 ° C.), liquefied natural gas (−162 ° C.), ethylene (about −169.2 ° C.) (− 162 ° C.).

Next, the seal structure 2 will be described in detail with reference to FIG.
In the present application, “inner side” means a direction D1 (see FIG. 3) toward the central axis AA (see FIG. 2), and “outer side” moves away from the central axis AA (see FIG. 2). It means the direction D2 (see FIG. 3). The “high pressure side” means a direction D3 (see FIG. 3) toward the high pressure side of the fluid F with respect to the seal structure 2 of the present invention in the mounted state, and “low pressure side” means the seal structure of the present invention. 2, the external direction D4 (see FIG. 3) toward the low-pressure side opposite to the high-pressure side. The “axial direction” means a direction parallel to the central axis AA. Further, “radial direction” means the direction of the diameter of a circle centered on the central axis AA.

  As shown in FIG. 1, the seal structure 2 includes a seal member 16 that seals a gap G between mutually facing surfaces, a first deformation suppression unit 18 and a second deformation suppression unit 20 that suppress deformation of the seal member 16. And a first spring 22 and a second spring 24 that urge the seal member 16 against the surface to be sealed. The entire seal structure 2 is annular. That is, the seal member 16, the first deformation suppressing portion 18, and the second deformation suppressing portion 20 configuring the ring member are annular, and the first spring 22 and the second spring 24 are coil springs extending in an annular shape.

  As shown in FIG. 1, in the cross section of the seal structure 2, the seal member 16 has a first surface to be sealed (the housing surface when mounted on the valve 1 shown in FIGS. 2 and 3 as will be described later). 6b), a first seal end 16a that seals the first seal end 16a, and a second surface opposite to the first surface (the valve seat surface 10b when mounted on the valve 1, as will be described later). ) And a second seal end portion 16b for sealing the same, and an intermediate portion 16c extending between the first seal end portion 16a and the second seal end portion 16b. The seal member 16 is formed in a substantially U-shape integrally with the first seal end portion 16a, the intermediate portion 16c, and the second seal end portion 16b. An internal space S is formed inside the substantially U-shaped seal member 16, and the first deformation suppressing portion 18, the first spring 22, and the second spring 24 are disposed in the internal space S. The cross-sectional shape of the seal member 16 is substantially U-shaped (meaning a shape in which only one is open, including a curved C-shape, etc.), or at least one in which the high-pressure side is open. The intermediate portion 16c is not limited to a shape that extends linearly. For example, a protrusion that protrudes from the intermediate portion 16c toward the low pressure side may be formed, and any other shape may be formed on the low pressure side. Good. The seal member 16 is made of a resin material. As can be seen by comparing FIG. 1 and FIG. 3, the width dimension W1 in the radial direction of the seal member 16 in the unmounted state is set larger than the width dimension W2 of the gap G to be sealed.

The resin material for forming the sealing member 16 may be any material having an appropriate flexibility capable of exhibiting sealing performance even at low temperatures. For example, PTFE (polytetrafluoroethylene) material, PCTFE (polychlorotrifluoroethylene) ) Material, Turcon T01 (registered trademark) material, or the like. More specifically, PTFE material is about −254 ° C. to about 232 ° C., PCTFE material is about −254 ° C. to about 177 ° C., and Turcon T01® material is about −254 ° C. to about 232 ° C. It can be used in the temperature range of ° C. Furthermore, these resin materials have chemical resistance, and can be used as a sealing material even if the fluid F is a chemical such as ethylene. The linear expansion coefficient of the PTFE (polytetrafluoroethylene) material is 10.0 (10 ⁻⁵ / ° C.), and the linear expansion coefficient of the PCTFE (polychlorotrifluoroethylene) material is 6.0 (10 ⁻⁵ / C.), and the respective coefficient of linear expansion of the Turcon T01 (registered trademark) material is 10.0 (10 ⁻⁵ / ° C.).

  The first deformation suppressing portion 18 is received in the internal space S of the substantially U-shaped seal member 16 and constitutes a central core portion that supports the seal member 16 from the inside. A first spring 22 and a second spring 24 are disposed between the first deformation suppressing portion 18 and the first seal end portion 16a and between the first deformation suppressing portion 18 and the second seal end portion 16b, respectively. Has been. More specifically, the entire first deformation suppressing portion 18 has an annular shape, and its cross section has a substantially rectangular shape or a substantially rectangular shape. Concave portions 18 b and 18 c for seating the inner portion of the first spring 22 and the outer portion of the second spring 24 are formed on the inner surface and the outer surface of the first deformation suppressing portion 18, respectively. As a result, the first spring 22 and the second spring 24 move relative to the first seal end portion 16a, the second seal end portion 16b, and the first deformation suppressing portion 18 in the space S of the seal member 16. Is prevented. Further, the first deformation suppressing portion 18 has a contact surface 18a (surface on the low pressure side in the mounted state) that contacts the inner surface 16d of the intermediate portion 16c.

  The first spring 22 is an annular coil spring, and extends around the central axis AA along the recess 18 b of the ring-shaped first deformation suppressing portion 18. Similarly, the second spring 24 is an annular coil spring, and extends around the central axis AA along the recess 18c of the annular first deformation suppressing portion 18. As the first spring 22 and the second spring 24, helical helical springs are used, but the first surface to seal the first seal end 16a of the seal member 16 (the housing surface 6b in the case of the valve 1). ) And any urging means capable of urging the second seal end 16b against the second surface (valve seat surface 10b in the case of the valve 1). For example, a spring such as a slant coil spring or a V-spring may be used. The first spring 22 and the second spring 24 can be used at a low temperature, and are formed of a material having corrosion resistance and chemical resistance, such as stainless steel, Hastelloy (registered trademark) alloy. , Elgiroy (registered trademark) and the like.

  In the cross section of the second deformation suppressing portion 20, the width dimension W3 in the radial direction is the same as the width dimension W2 in the radial direction of the gap G to be sealed (in the case of the valve 1, the width of the gap G shown in FIG. 3). The size is preferably slightly smaller. As shown in FIG. 1, the second deformation suppressing portion 20 is located on the opposite side of the intermediate portion 16 c from the first deformation suppressing portion 18, and the outer surface 16 f of the intermediate portion 16 c of the seal member 16 (the low pressure side surface in the mounted state). It is arranged to surround. More specifically, the second deformation suppressing portion 20 includes an outer wall portion 20b that contacts the outer surface 16f of the intermediate portion 16c, an inner wall portion 20c that contacts the inner surface 16g of the intermediate portion 16c, and an intermediate portion of the intermediate portion 16c. An intermediate wall portion 20a that comes into contact with the outer surface 16e is provided. The second deformation suppressing portion 20 is formed so that the outer wall portion 20b, the inner wall portion 20c, and the intermediate wall portion 20a are integrated and have a substantially U-shaped cross section. The outer wall portion 20b of the second deformation suppressing portion 20 receives the intermediate portion 16c of the substantially U-shaped seal member 16 and covers the outside of the outer surface 16f. The intermediate portion 16c of the seal member 16 is the second portion. It is sandwiched between the deformation suppression unit 20 and the first deformation suppression unit 18. The first seal end portion 16 a and the second seal end portion 16 b of the seal member 16 extend outside the second deformation suppressing portion 20.

  Further, a concave portion 16h is formed on the inner side surface 16g of the intermediate portion 16c of the seal member 16, which is a surface facing the inner wall portion 20c of the second deformation suppressing portion 20, while the concave portion is formed on the inner wall portion 20c. A lock portion 20d that protrudes toward 16h and engages with the recess 16h is provided. As a result, the seal member 16 is locked with respect to the second deformation suppressing portion 20, and sliding friction between the housing surface 6 b of the housing 6 and the first seal end portion 16 a and / or the valve seat surface 10 b of the valve seat 10 and the second It is possible to prevent the seal member 16 from being detached from the second deformation suppressing portion 20 due to sliding friction with the two seal end portions 16b.

The first deformation suppression unit 18 and the second deformation suppression unit 20 are both made of metal, and the linear expansion coefficient of the first deformation suppression unit 18 is lower than the linear expansion coefficient of the resin material forming the seal member 16. More specifically, the linear expansion coefficient of the first deformation suppression unit 18 and the second deformation suppression unit 20 is formed of a metal lower than the linear expansion coefficient of the resin material forming the seal member 16. For example, it is made of copper, stainless steel, brass, aluminum bronze or the like. The linear expansion coefficients of copper, stainless steel, brass and aluminum bronze are 1.6, 1.4, 1.8 and 1.6 (10 ⁻⁵ / ° C.), respectively. The first deformation suppressing portion 18 and the second deformation suppressing portion 20 are preferably formed of a metal having a linear expansion coefficient equal to or less than one third with respect to the linear expansion coefficient of the resin material of the seal member 16, and preferably Is formed of a metal having a linear expansion coefficient of 1/6 or less with respect to the linear expansion coefficient of the resin material of the seal member 16, and more preferably, the first deformation suppression unit 18 and the second deformation suppression unit 20 are You may form with the metal (for example, stainless steel) which has a linear expansion coefficient of 1/7 or less with respect to the linear expansion coefficient of a resin material (for example, PTFE material). Further, for example, the seal member 16 is formed of a metal having a linear expansion coefficient of one third or less with respect to the linear expansion coefficient of the PCTFE material, and for example, with respect to the linear expansion coefficient of the PTFE material of the seal member 16. For example, it may be made of a metal having a linear expansion coefficient of 1/10 or less. Therefore, even when the first deformation suppressing unit 18 and the second deformation suppressing unit 20 have their own temperature lowered by a low-temperature fluid, the changes in the size and volume of the first deformation suppressing unit 18 and the second deformation suppressing unit 20 are relatively smaller than those of the seal member 16. Has been. That is, when the temperature changes from normal temperature to low temperature, the first deformation suppression unit 18 and the second deformation suppression unit 20 have a relatively low rate of contraction deformation compared to the seal member, and are not easily deformed. Therefore, the first deformation suppressing portion 18 and the second deformation suppressing portion 20 can effectively suppress the deformation of the seal member 16 due to temperature, pressure, and the like, and the sealing performance of the seal structure 2 even in a low temperature state. Can be maintained.

  Next, the mounting of the seal structure 2 shown in FIG. 1 in the gap G of the valve 1 shown in FIGS. 2 and 3 will be described.

  As shown in FIGS. 2 and 3, the seal structure 2 shown in FIG. 1 includes a U-shaped seal member 16 between the housing surface 6 b and the valve seat surface 10 b facing each other in the gap G of the valve 1. It is mounted so that the open side is oriented to the high pressure side of the fluid F. Specifically, when the seal structure 2 is installed in the gap G, as shown in FIGS. 2 and 3, the seal structure 2 is installed so as to contact the low pressure side surface of the stepped portion 10 b of the valve seat 10. The inside is held at that position by the pressure of the high-pressure fluid F.

  As can be seen from FIG. 1, the width dimension W1 in the radial direction of the seal member 16 in the unmounted state is larger than the width dimension W2 of the gap G. As shown in FIG. When mounted on G, the first spring 22 and the second spring 24 are compressed, and the first seal end portion 16a and the second seal end portion 16b of the seal member 16 are respectively in relation to the housing surface 6b and the valve seat surface 10b. Is energized.

  In the cross section of the second deformation suppressing portion 20, the width dimension W3 in the radial direction is slightly smaller than the width dimension W2 in the radial direction of the gap G to be sealed (see FIG. 3). As a result, the second deformation suppressing portion 20 can slide in the axial direction between the housing surface 6b and the valve seat surface 10b that can move relative to each other, and the seal structure 2 can be easily mounted between the gaps G. And relative translation of these surfaces is allowed.

The operational effects of the above-described seal structure according to the embodiment of the present invention will be described.
The PTFE material or PCTFE material forming the seal member 16 is soft enough to exhibit the seal performance even in a low temperature state where a fluid of about −196 ° C. flows, and has a chemical resistance, for example. Suitable for On the other hand, the linear expansion coefficients of these resin materials are 10.0 (10 ⁻⁵ / ° C.) for the PTFE material and 6.0 (10 ⁻⁵ / ° C.) for the PCTFE material. As such, shrinkage deformation is relatively large at low temperatures. In the present invention, since the seal member 16 is made of PTFE material or PCTFE material, the fluid F is hard to be cured not only at room temperature but also at a low temperature, particularly at an ultra-low temperature such as about −196 ° C. It is possible to provide a seal structure 2 that can exhibit good sealing performance and further chemical performance.

  In the seal structure 2, the seal member 16 is held by the first deformation suppression unit 18 and the second deformation suppression unit 20, so that the seal member 16 is not limited to a temperature state, but from a normal temperature state to a low temperature state, particularly in a low temperature state. In addition, the shape of the seal member 16 is maintained by the first deformation suppressing portion 18 and the second deformation suppressing portion 20, and in particular, it is possible to provide the seal structure 2 that can exhibit good sealing ability even at low temperatures. That is, when the seal structure 2 seals between the housing surface 6b and the valve seat surface 10b, the first deformation suppressing portion 18 that is relatively less deformed by a temperature change due to the temperature of the fluid has the first seal end portion 16a and the first Since the second seal end portion 16b is disposed between the second seal end portion 16b and the valve seat surface 10b, the first seal end portion 16a is in contact with the valve seat surface 10b. It is maintained, the sealing state can be maintained well, and fluid leakage can be suppressed. Furthermore, according to the present invention, the second deformation suppressing portion 20 suppresses shrinkage deformation to the inside of the entire sealing member 16, particularly in a low temperature state, so that the sealing member 16 “holds” the valve seat 10. Since the contact of the outer first seal end portion 16a with the housing surface 6b is maintained, the sealed state can be maintained well even at a low temperature, and fluid leakage can be suppressed. .

  Furthermore, in the seal structure 2, the intermediate portion 16c of the seal member 16 is sandwiched between the first deformation suppression portion 18 and the second deformation suppression portion 20, so that the shape of the seal member at normal temperature (this In the embodiment, it is possible to maintain a substantially U-shaped shape), and thus it is possible to maintain a good seal state and to suppress fluid leakage.

  Furthermore, in the seal structure 2, the seal member 16 is locked with respect to the second deformation suppressing portion 20, so that sliding friction between the housing surface 6 b of the housing 6 and the first seal end portion 16 a and / or the valve seat 10 is achieved. It is possible to prevent the seal member 16 from being detached from the second deformation suppressing portion 20 due to the sliding friction between the valve seat surface 10b and the second seal end portion 16b.

  Further, in the seal structure 2, even when the housing surface 6b and the valve seat surface 10b move relative to each other, the second deformation suppressing portion 20 allows relative movement between the housing surface 6b and the valve seat surface 10b. Wear between the second deformation suppressing portion 20, the housing surface 6b, and the valve seat surface 10b can be prevented. Furthermore, according to the seal structure 2 of the present invention, the seal member 16 can be easily mounted in the annular gap.

DESCRIPTION OF SYMBOLS 1 Valve 2 Seal structure 4 Flow path 6 Housing 6c Housing surface 10 Valve seat 10c Valve seat surface 16 Seal member 16a First seal end 16b Second seal end 16c Intermediate portion 16h Recess 18 First deformation suppression portion 20 Second deformation Suppressing part 20d Locking part D1 Inside D2 Outside D3 High pressure side D4 Low pressure side F Fluid A-A Center axis

Claims (5)

A seal structure for sealing a gap between a first surface of a first machine component and a second surface of a second machine component facing the first surface,
A first seal end extending along the first surface, a second seal end extending along the second surface, and a space between the first seal end and the second seal end. A seal member made of a resin material including an intermediate portion extending between the first seal end portion and the second seal end portion;
A first deformation suppressing member formed of a first metal for suppressing deformation of the seal member, disposed in the space;
The first seal end portion disposed between the first deformation suppression member and the first seal end portion and between the first deformation suppression member and the second seal end portion is defined as the first seal end portion. And a spring member for urging the second seal end against the second surface,
The seal structure according to claim 1, wherein a linear expansion coefficient of the first metal is lower than a linear expansion coefficient of the resin material. The seal member is substantially U-shaped with the first seal end, the second seal end, and the intermediate portion;
The seal structure further includes a second deformation suppressing member for enclosing the outer surface of the intermediate portion and suppressing deformation of the intermediate portion, and the second deformation suppressing member has a width dimension smaller than the width dimension of the gap. The second deformation suppressing member is formed of a second metal, and the linear expansion coefficient of the second metal is lower than the linear expansion coefficient of the resin material. The seal structure described in 1.   The seal member has a recess formed on a surface thereof facing the second deformation suppressing member, and the second deformation suppressing member protrudes into the recess and is locked to the recess. The seal structure according to claim 2, further comprising a lock portion.   The linear expansion coefficient of the first metal forming the first deformation suppressing member is one third or less of the linear expansion coefficient of the resin forming the sealing member. The seal structure according to any one of the above.   4. The linear expansion coefficient of the second metal forming the second deformation suppressing member is 1/3 or less of the linear expansion coefficient of the resin forming the sealing member. 5. The seal structure described in 1.

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