WO2020095887A1

WO2020095887A1 - Seal structure

Info

Publication number: WO2020095887A1
Application number: PCT/JP2019/043251
Authority: WO
Inventors: 貴則坂口; 幸佑西山; 陽平三木
Original assignee: 本田技研工業株式会社; Nok株式会社
Priority date: 2018-11-07
Filing date: 2019-11-05
Publication date: 2020-05-14
Also published as: JPWO2020095887A1; CN216643076U; JP7133642B2

Abstract

[Problem] To provide a seal structure which makes it possible to reliably discharge leakage fluid into a discharge passageway. [Solution] The seal structure comprises a seal member 50 which is disposed between a first surface 16 and a second surface 18 opposing each other, and by which a passageway 20 opened in the first surface 16 and a passageway 24 opened in the second surface 18 are connected in a sealed state, the second surface 18 having a discharge hole 26. The seal member 50 comprises: a first seal portion 54 defining a communicating opening 52 corresponding to the passageways 20, 24; a second seal portion 56 which is disposed outside the first seal portion 54 so as to surround the first seal portion 54, and which includes an extension portion 60 extending in a direction away from the first seal portion 54; and a linking portion 58 which links the first seal portion 54 and the second seal portion 56, and has a discharge-opening 62 communicating with the discharge hole 26. The second surface 18 has an annular protrusion 30 enclosing the discharge hole 26 and protruding through the discharge-opening 62.

Description

Seal structure

The present invention relates to a seal structure, and more specifically to a seal structure using a seal member including a drain portion.

The seal member is disposed between the first surface and the second surface facing each other, and serves as a seal member for connecting the passage opened to the first surface and the passage opened to the second surface, and both of the inner portions are provided. An annular inner seal portion that defines a communication opening aligned with the passage, an annular outer seal portion that is outside the inner seal portion and is concentric with the inner seal portion, the inner seal portion and the outer seal. There is known a double-structured seal member having a ring-shaped connecting portion that extends between the seal portion and the seal portion and connects both seal portions (for example, Patent Document 1).

In the seal structure using the above-described seal member, the seal member is sandwiched between the first surface and the second surface, so that the inner seal portion and the outer seal portion are elastically deformed, and the seal member is provided on both sides of the connecting portion. An annular space is defined between each of the first surface and the second surface. By adopting a structure in which the annular space communicates with the outside by the discharge passage opened to the first surface and the second surface, the annular space serves as a buffer space, and a seal breakage occurs at the inner seal portion. Even if a fluid leaks from the communication opening to the buffer space, the fluid is discharged to the outside by the discharge passage and is prevented from leaking beyond the outer seal portion.

Special table 2017-500946

However, in the seal member in which the inner seal portion and the outer seal portion are connected to each other by the connecting portion, when the seal of the inner seal portion is broken due to the deformation, the connecting portion and the outer seal portion may also be deformed. Therefore, the buffer space and the discharge passage may be blocked. By increasing the size of the connecting part and ensuring a sufficient distance between the inner seal part and the outer seal part, it is possible to reduce the influence of the deformation of the inner seal part on the deformation of the connecting part and the outer seal part. However, there is a problem that the size increases.

The problem to be solved by the present invention is to provide a seal structure capable of reliably discharging the leaked fluid to the discharge passage.

A sealing structure according to one embodiment of the present invention includes a passageway (20) disposed between a first surface (16) and a second surface (18) facing each other and opening to the first surface. A seal structure including a seal member (50) for connecting in a sealed state with a passageway (24) opened to the second surface, and having a discharge hole (26) on the second surface, The seal member includes a first seal portion (54) defining a communication opening (52) corresponding to the both passages, and the first seal portion surrounding the first seal portion outside the first seal portion. A second seal part (56) including an expansion part (60) expanded in a direction away from the seal part, the first seal part and the second seal part, and the discharge hole. And a connecting portion (58) having a discharge opening (62) communicating with The second surface, said discharge hole and an outer circumference, and an annular projection (30) projecting from the second face so as to pass through the discharge opening is provided.

With this configuration, the leaked fluid can be reliably discharged from the discharge hole to the discharge passage.

In the above seal structure, preferably, the first seal portion has a circular shape, and the second seal portion includes a semicircular portion (56A) coaxially surrounding the first seal portion, An extension is partially defined by a pair of tangents extending from the semi-circular portion.

According to this configuration, it is possible to effectively prevent an increase in the area and material amount required for the arrangement of the seal member, while ensuring a large area of the portion where the discharge opening is provided.

In the above-mentioned sealing structure, preferably, the outer peripheral surface (30A) of the annular protrusion is circumscribed by the opening edge (63) of the discharge opening.

With this configuration, the position where the discharge opening communicates with the discharge hole is determined more reliably, and the possibility that the discharge opening is blocked or the communication area between the discharge opening and the discharge hole is reduced is reduced. ..

In the above seal structure, preferably, at least one of the first surface and the second surface is provided with a recess (28) for receiving the seal member.

According to this configuration, the arrangement position of the seal member with respect to the first surface or the second surface can be reliably determined.

In the above-mentioned seal structure, preferably, the concave portion has a first peripheral surface (28A) circumscribing an inner peripheral portion of the first seal portion and a second peripheral portion inscribing an outer peripheral portion of the second seal portion. And a peripheral surface (28B).

According to this configuration, the seal member (50) fits in the recess (28), and the seal member (50) is securely attached.

In the above seal structure, preferably, the outer peripheral surface (30A) of the protrusion is formed along the inner peripheral surface (28B) of the recess.

According to this configuration, the second seal portion can be brought close to the outer peripheral surface of the protrusion, and the collapse of the second seal portion can be suppressed.

In the above seal structure, preferably, each of the first seal portion and the second seal portion has a circular or polygonal cross section, and the connecting portion includes the first seal portion and the second seal portion. In the area between the seal portions, the plate-shaped portion extends over the entire area except the discharge opening.

According to this structure, reliable sealing is performed.

In the above seal structure, preferably, the second seal portion extends outward from a vertical center portion of the outer periphery of the main portion of the second seal portion and has a vertical thickness smaller than that of the main portion. Includes a protrusion (59).

According to this configuration, the rigidity of the second seal portion is improved, and the defective deformation of the second seal portion is suppressed.

In the above-mentioned seal structure, preferably, the protruding portion is provided only in a portion of the second seal portion that faces the expanded portion and the first seal portion that faces the expanded portion.

According to this configuration, in particular, the rigidity of the first seal portion and the second seal portion of the portion that defines the expansion portion is improved, and the defective deformation of the first seal portion and the second seal portion of the portion is improved. Suppressed.

In the above seal structure, preferably, the protruding portion is provided only on the inner peripheral surface of the second seal portion or only on the outer peripheral surface of the first seal portion.

According to this configuration, the protrusion does not obstruct the fitting of the seal member into the recess.

In the above seal structure, preferably, the seal member is made of elastomer.

According to this structure, reliable sealing is performed based on elastic deformation of the seal member.

According to the seal structure of the present invention, the leaked fluid can be reliably discharged to the discharge passage.

FIG. 3 is a vertical sectional view showing an embodiment of the seal structure according to the present invention. View (plan view) taken along the line AA of FIG. The AA arrow view (plan view) of FIG. 1 with the seal member used in the seal structure according to the present embodiment removed. The top view of the seal member used for the seal structure by this embodiment. Sectional view along line VV of FIG. The top view of the seal member of other embodiment. Enlarged plan view of portion B of FIG. Sectional view taken along line IIX-IIX in FIG. Enlarged plan view of portion C in FIG. Enlarged plan view of portion C in FIG. The top view of the seal member of other embodiment. Sectional drawing of the sealing member of other embodiment.

One embodiment of the seal structure according to the present invention will be described below with reference to FIGS. 1 to 5.

1 and 2 show an example in which the seal structure of the present embodiment is applied to a liquid-cooled casing 10 for electric power equipment and the like.

The casing 10 includes a first member 12 and a second member 14 which are connected to each other by bolts or the like (not shown). Various electric components, a wiring board (not shown), and the like are arranged in the internal space of the casing 10.

The first member 12 has a flat first surface (lower surface as viewed in FIG. 1) 16. The second member 14 has a flat second surface (upper surface as viewed in FIG. 1) 18 facing the first surface 16.

The first member 12 has an upper cooling liquid passage 20 that is open on the first surface 16 with an opening end 20A. The second member 14 has a lower coolant passage 24 defined in cooperation with a lower lid member 22 attached to the second member 14. The lower cooling liquid passage 24 is open to the second surface 18 with an opening end 24 </ b> A so as to communicate with the upper cooling liquid passage 20. The opening end 20A of the upper cooling liquid passage 20 and the opening end 24A of the lower cooling liquid passage 24 are circular holes having substantially the same inner diameter, and are aligned concentrically with each other. With this passage structure, the cooling liquid flows from the lower cooling liquid passage 24 to the upper cooling liquid passage 20.

The second member 14 is formed with a drain hole 26 that is open to the atmosphere by a round hole that is opened in the second surface 18 at a position that is distant from the opening end 24A in the radial direction. The end of the drain hole 26 that opens to the second surface 18 is an expansion recess 26A that is expanded in a substantially triangular shape in plan view.

The second surface 18 is provided with a recess 28 that receives a seal member (gasket) 50. Here, prior to the description of the recess 28, the structure of the seal member 50 will be described with reference to FIGS. 4 and 5 in addition to FIGS. 1 and 2.

The seal member 50 is mounted in the recess 28 so that the seal member 50 is disposed between the first surface 16 and the second surface 18 and connects the upper cooling liquid passage 20 and the lower cooling liquid passage 24. I do.

The seal member 50 is one molded product made of an elastomer such as vulcanized rubber or urethane rubber, and has an annular shape (circular in plan view) that defines a circular communication opening 52 that is concentrically aligned with the opening ends 20A and 24A. ) First seal portion 54, an annular second seal portion 56 extending outside the first seal portion 54 to surround the first seal portion 54, the first seal portion 54 and the first seal portion 54. The second seal portion 56 and the connecting portion 58 that connects the

seal portions

54 and 56 to each other. The seal member 50 performs a reliable seal under the elastic deformation of the first seal portion 54 and the second seal portion 56.

The connecting portion 58 is a flat plate-shaped portion having a vertical thickness smaller than the main portions of the first seal portion 54 and the second seal portion 56. The main parts of the first seal part 54 and the second seal part 56 are polygonal (octagonal) cross-sectional shapes formed by a combination of substantially trapezoidal shapes protruding in the vertical direction from the upper surface and the lower surface of the connecting part 58, respectively. It makes a protrusion. Accordingly, the connecting portion 58 does not hinder the sealing action of the first seal portion 54 and the second seal portion 56.

The first seal portion 54 extends inwardly from the central portion of the main portion of the first seal portion 54 in the vertical direction, and has a protrusion portion 53 having a smaller vertical thickness than the main portion over the entire circumference. Thereby, the bending rigidity of the seal member 50 is improved, and the defective deformation of the seal member 50 is suppressed. In addition, the second seal portion 56 extends outward from the central portion in the vertical direction of the main portion of the second seal portion 56, and has a projecting portion 59 having a smaller vertical thickness than the main portion over the entire circumference. Have. Thereby, the bending rigidity of the seal member 50 is improved, and the defective deformation of the seal member 50 is suppressed.

The second seal portion 56 extends concentrically with the first seal portion 54 on one radial side of the first seal portion 54 in a plan view, that is, the first seal portion 54 is coaxial. 56A surrounding the first semi-circular portion and a second semi-circular portion 56B having a center at a position apart from the other radial side of the first seal portion 54 (the side opposite to the one side). And a closed loop shape defined by

linear portions

56C and 56D extending between both ends so as to connect the ends of the first semi-circular portion 56A and the ends of the second semi-circular portion 56B at corresponding sides. Is playing.

The second semi-circular portion 56B has a semi-circular shape with a radius smaller than that of the first semi-circular portion 56A in plan view, and is concentric with the drain hole 26 in a state where the seal member 50 is mounted in the recess 28, and is larger than the drain hole 26. It is a semicircle with a large radius.

In this way, the second seal portion 56 has a round top in a plan view expanded in the direction radially outward from the first seal portion 54 by the second semicircular portion 56B and the

straight portions

56C and 56D. It includes a substantially triangular expansion portion 60.

In other words, the second seal portion 56 has, in plan view, a circle concentric with the first seal portion 54, a circle including the outer edge of the expansion portion 60, and two tangent lines shared by the two circles. Has a closed loop shape formed by the outer contour line.

A region B surrounded by the expansion portion 60 and the first seal portion 54 (hereinafter referred to as an expansion region B) has a substantially triangular shape with a round top in a plan view. According to this shape, when the distance between the centers of the first semi-circular portion 56A and the second semi-circular portion 56B and the radii of the first semi-circular portion 56A and the second semi-circular portion 56B are constant, expansion is achieved. The circumference of the region B, that is, the line length (circulation length) of the second seal portion 56 is minimized.

Due to this, the increase in the line length required for the arrangement of the seal member 50 due to the presence of the expansion region B is reduced, and the increase in the material amount of the seal member 50 is reduced.

The connecting portion 58 extends in a semicircular shape with a relatively small lateral width between the first semicircular portion 56A and a portion corresponding to the first semicircular portion 56A in a plan view. In the portion corresponding to the expansion region B, the connecting portion 58 extends between the expansion portion 60 and the first seal portion 54 in a substantially triangular shape having a round top. A substantially triangular drain opening 62 that communicates with the drain hole 26 is provided at a portion of the connecting portion 58 corresponding to the expansion region B.

Next, details of the recess 28 will be described with reference to FIGS. 1 to 3. The concave portion 28 includes an annular land portion 25 that defines an annular outer peripheral surface 28A with which the first seal portion 54 is circumscribed, that is, an inner peripheral surface 55 of the first seal portion 54 abuts, and a second seal portion 56. It includes inward contact, that is, an annular inner peripheral surface 28B with which the outer peripheral surface 57 of the second seal portion 56 abuts, and a flat bottom surface 28C. In plan view, the outer peripheral surface 28A has the same shape as the inner shape of the first seal portion 54, while the inner peripheral surface 28B has the same shape as the outer shape of the second seal portion 56. An annular land portion that includes an outer peripheral surface 30A that protrudes from the bottom surface 28C and surrounds the expansion recess 26A of the drain hole 26 and is circumscribed by the drain opening 62, that is, the outer peripheral surface 30A with which the opening edge 63 of the drain opening 62 contacts 30 is formed.

In other words, the bottom of the recess 28 passes through the drain opening 62 and projects toward the first surface 16, and the drain opening 62 is opened at the tip of the recess 28 to form the annular land portion 30. It is provided.

-The annular land portion 30 is formed in a triangular shape with a rounded top in a plan view. The tip surface 30B of the annular land portion 30 is entirely a plane parallel to the first surface 16.

In the seal member 50, as shown in FIGS. 1 and 2, in the state where the first member 12 is removed from the second member 14, the inner peripheral surface 55 of the first seal portion 54 has the outer periphery of the recess 28. The outer peripheral surface 57 of the second seal portion 56 abuts (inscribes) the surface 28A, the outer peripheral surface 57 of the second seal portion 56 abuts (inscribes) the inner peripheral surface 28B of the recess 28, and the opening edge 63 of the drain opening 62 has an annular land portion. The entire part is fitted into the recess 28 so as to abut (circumscribe) the outer peripheral surface 30A of 30. By this fitting, the seal member 50 is securely attached to the second member 14.

In this fitted state, the opening edge 63 of the drain opening 62 circumscribes the outer peripheral surface 30A of the annular land portion 30, and the second semicircular portion 56B forms the inner peripheral surface 28B of the recess 28 and the outer peripheral surface 30A of the annular land portion 30. By sandwiching between the second member 14 and the second member 14, the mounting position of the expanded portion 60 of the second seal portion 56 is determined, and the expanded portion 60 including the connecting portion 58 at this portion is prevented from shifting.

With this, the position of the drain opening 62 with respect to the drain hole 26 is reliably determined, and the communication between the drain opening 62 and the drain hole 26 is ensured.

Since the outer peripheral surface 30A of the annular land portion 30 is formed so as to extend along the inner peripheral surface 28B of the recess 28 in a plan view, the outer peripheral surface 30A of the annular land portion 30 and the inner peripheral surface 28B of the recess 28 are formed. By arranging the second seal portion 56 in a section sandwiched between and, it is possible to prevent the second seal portion 56 from collapsing.

As shown in FIG. 1, the first member 12 is coupled to the second member 14 by a bolt or the like (not shown), so that the seal member 50 is formed on the first surface 16 and the bottom surface 28C of the recess 28. The first seal portion 54 and the second seal portion 56 are compressed and elastically deformed by being sandwiched between them. As a result, the first seal portion 54 and the second seal portion 56 are brought into pressure contact with the first surface 16 of the first member 12 and the bottom surface 28C of the recess 28, which face each other, and the first seal portion 54 and the second seal portion 54 An appropriate sealing pressure is obtained based on an appropriate elastic deformation of the seal portion 56, and the upper cooling liquid passage 20 and the lower cooling liquid passage 24 are connected in a liquid-tight (airtight) sealed state.

In this state, the first surface 16 and the second surface 18 may abut each other as shown in FIG. 1, but the first seal portion 54 and the second seal portion If 56 is in pressure contact with the first surface 16 of the first member 12 and the bottom surface 28C of the recess 28 that face each other, the first surface 16 and the second surface 18 do not necessarily have to abut.

In the above-described sealed state, the connecting portion 58 cooperates with the first surface 16 between the first semi-circular portion 56A of the second seal portion 56 and the first seal portion 54 and is semi-circular in plan view. The narrow space 32 is formed, and the area defined by the expansion portion 60, the first seal portion 54, and the first surface 16, that is, the expansion area B, cooperates with the first surface 16 and is viewed in plan. Forms a relatively wide space 34 having a substantially triangular shape. The space 32 communicates with the space 34 at both ends of the semicircle. The space 34 communicates with the drain hole 26 through the drain opening 62. Due to this communication structure, the

spaces

32 and 34 form a buffer space of substantially atmospheric pressure.

As a result, a seal breakage occurs in the first seal portion 54, and the coolant flowing through the upper cooling liquid passage 20 and the lower cooling liquid passage 24 gets over the first sealing portion 54 and leaks into the

spaces

32, 34. However, the passage of the cooling liquid is prevented by the second seal portion 56, and the cooling liquid flows through the

spaces

32 and 34 toward the atmosphere side where the pressure is relatively low to reach the drain opening 62, and from the drain hole 26. It flows out of the casing 10. As a result, even if the seal breaks at any position of the first seal portion 54, it is possible to prevent the coolant from passing over the second seal portion 56 and leaking to the inside of the casing 10.

The drain opening 62 of the seal member 50 is different from the narrow connecting portion 58 between the first semicircular portion 56A of the second seal portion 56 and the first seal portion 54, and the second seal portion 56. Since it is provided in the connecting portion 58 between the expansion portion 60 and the first seal portion 54, it is easy to secure a relatively large area, and the first seal portion 54 and the second seal portion 56 are elastically deformed. This can reduce the risk that the drain opening 62 is blocked or the communication area between the drain hole 26 and the drain opening 62 is reduced. As a result, the leaked cooling liquid can be reliably and reliably discharged to the outside of the casing 10.

Since the connecting portion 58 has a narrow width between the first semicircular portion 56A of the second seal portion 56 and the first seal portion 54, the connecting portion 58 has the connecting portion 58 between the first seal portion 54 and the second seal portion 54. It is possible to secure an area of a portion where the drain opening 62 is provided as compared with a case where it is provided widely over the entire circumference of the portion 56, and to suppress an increase in area and material amount necessary for disposing the seal member 50. ..

Note that a part of the drain opening edge 63 may be separated from the outer peripheral surface 30A of the annular land portion 30 to form a path that more reliably connects the upper and lower spaces of the connecting portion 58. With this, even if the drain opening 62 is pressed, it is possible to prevent the

spaces

32 and 34 from being divided into upper and lower parts in the cross section of FIG. It is possible to surely communicate with the drain hole 26.

Due to the above, the equipment contained in the casing 10 is reliably and reliably prevented from being contaminated by the cooling liquid.

Next, another embodiment of the seal member used in the seal structure according to the present invention will be described with reference to FIGS. 6 to 9. 6 to 9, the parts corresponding to those in FIGS. 4 and 5 are designated by the same reference numerals as those in FIGS. 4 and 5, and the description thereof is omitted.

In this embodiment, the first seal portion 54 faces the drain opening 62, that is, the first seal portion 54 corresponds to the drain opening 62 in a plan view. An arcuate projecting portion 54B projecting outward from the side surface and an arcuate projecting portion 54C projecting inward from the inner surface of the portion 54A are formed. As a result, the portion 54A is a widened portion having a larger width than the other portions.

The second seal portion 56 is the two

portions

56E and 56F facing the drain opening 62, in other words, the second seal portion 56 is the

portions

56E and 56F corresponding to the drain opening 62 in plan view, In the connecting portion of each of the

linear portions

56C and 56D with the second semi-circular portion 56B, the protrusion 56G and the inside of the

portions

56E and 56F which are outwardly protruded from the outer surfaces of the

portions

56E and 56F and which are arcuate in plan view. A projecting portion 56H having an arcuate shape in plan view projecting inward from the side surface is formed. As a result, the

portions

56E and 56F are widened portions having a larger width than the other portions.

That is, the protruding

portions

54B, 54C, 56G, and 56H are partially provided only in the portion facing the extension portion 60 of the second seal portion 56 and the extension portion of the first seal portion 54. In other words, the first seal portion 54 and the second seal portion 56 have portions extending adjacent to each other, such as the region of the first semicircular portion 56A, and the first seal portion 54 of the first seal portion 54. Including a region opposite to the region of the semi-circular portion 56A, a

straight portion

56C, 56D of the first seal portion 54, and a portion extending independently without adjoining each other, such as the second semi-circular portion 56B. The independently extending portion has widened portions (

portions

54A, 56E, 56F) that are wider than the other portions due to outwardly protruding

protrusions

54B, 54C, 56G, 56H.

As a result, the bending rigidity and the torsional rigidity of the portion 54A of the first seal portion 54 and the

portions

56E, 56F of the second seal portion 56 are improved, and these

portions

54A, 56E, 56F are not adjacent to each other. Even in the region, it is difficult for tilting and twisting due to bending deformation to occur. As a result, the sealing member 50 is unlikely to fall into a state of defective deformation over the whole, and the reliability of the seal is improved.

Since the seal member 50 abuts the outer peripheral surface 30A of the annular land portion 30 with the

protrusions

54B and 56H, a gap is defined between the seal member 50 and the annular land portion 30 to allow the leak liquid to flow into the drain hole 26.

Note that the

portions

54A, 56E, and 56F may be provided with only the

protrusions

54B and 56H, as shown in FIG. That is, the

protrusions

54B and 56H may be formed only on the outer peripheral surface of the first seal portion 54 and the inner peripheral surface of the second seal portion 56. In this case, the protrusion does not hinder the fitting of the seal member 50 into the recess 28.

The present invention has been described above with reference to its preferred embodiments, but the present invention is not limited to such embodiments and can be modified as appropriate without departing from the spirit of the present invention. For example, the drain hole 26 may be opened in the second surface 18, the concave portion 28 may be formed in the first surface 16, and the seal member 50 may be attached to the first member 12. The drain hole 26 may be connected to a leak fluid recovery circuit other than opening to the atmosphere. The cross-sectional shape of the main portion of each of the first seal portion 54 and the second seal portion 56 may be circular, as shown in FIG.

Also, not all of the constituent elements shown in the above embodiment are indispensable, and appropriate selection can be made without departing from the spirit of the present invention.

10: Casing 12: First member 14: Second member 16: First surface 18: Second surface 20: Upper cooling liquid passage 20A: Open end 22: Lower lid member 24: Lower cooling liquid passage 24A: Opening End 25: Annular land 26: Drain hole (discharge hole)
26A: expanded concave portion 28: concave portion 28A: outer peripheral surface 28B: inner peripheral surface 28C: bottom surface 30: annular land portion (annular protrusion portion)
30A ： Outer peripheral surface 30B ： Tip surface 50 ： Seal member 52 ： Communication opening 53 ： Projection part 54 ： First seal part 54A ： Part (widened part)
54B: protrusion 54C: protrusion 55: inner peripheral surface 56: second seal portion 55: inner peripheral surface 56A: first semicircular portion 56B: second semicircular portion 56C: straight portion 56D: straight portion 56E: portion (Widened part)
56F: Part (widened part)
56G: Projection 56H: Projection 57: Outer peripheral surface 58: Connection part 59: Projection 60: Expansion part 62: Drain opening (discharging opening)
63: Opening edge

Claims

A seal member is disposed between the first surface and the second surface facing each other and for connecting the passage opened to the first surface and the passage opened to the second surface in a sealed state. A seal structure including a discharge hole on the second surface,
The seal member includes a first seal portion that defines a communication opening corresponding to both the passages,
A second seal portion that includes an expansion portion that extends outside the first seal portion and that surrounds the first seal portion and that is expanded in a direction away from the first seal portion;
A connecting portion that connects the first seal portion and the second seal portion to each other and that has a discharge opening that communicates with the discharge hole;
A seal structure in which an annular protrusion is provided on the second surface so as to surround the discharge hole and project so as to pass through the discharge opening.
The first seal portion has a circular shape,
The second seal portion includes a semi-circular portion that coaxially surrounds the first seal portion, and the expansion portion is partially defined by a pair of tangent lines extending from the semi-circular portion. The seal structure according to claim 1.
The seal structure according to claim 1 or 2, wherein a recess for receiving the seal member is provided on at least one of the first surface and the second surface.
The said recessed part has a 1st peripheral surface which circumscribes the inner peripheral part of the said 1st seal part, and a 2nd peripheral surface inscribed in the outer peripheral part of the said 2nd seal part. Seal structure.
The seal structure according to any one of claims 1 to 4, wherein an outer edge of the annular protrusion is circumscribed by an opening edge of the discharge opening.
The seal structure according to claim 3 or 4, wherein an outer peripheral surface of the annular protrusion is formed along an inner peripheral surface of the recess.
Each of the first seal portion and the second seal portion has a circular or polygonal cross section, and the connecting portion is in a region between the first seal portion and the second seal portion, The seal structure according to any one of claims 1 to 6, which has a plate-shaped portion extending over the entire portion except the discharge opening.
The second seal portion includes a protruding portion that extends outward from a vertical center portion of the outer periphery of the main portion of the second seal portion and has a vertical thickness smaller than that of the main portion. 7. The seal structure according to any one of 7.
The seal structure according to claim 8, wherein the protruding portion is provided only in a portion of the second seal portion that faces the extension portion and the first seal portion that faces the extension portion.
The seal structure according to claim 9, wherein the protruding portion is provided only on an inner peripheral surface of the second seal portion or only on an outer peripheral surface of the first seal portion.