JPH09329257A - Seal structure between members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold suitable sealing property at the negative pressure regardless of the condition in which strong fastening force is eliminated by providing with a second engaged part engaged with a second engaging part at the time of negative pressure while providing in the vicinity of the opening rim of flow passage forming hole. SOLUTION: At the time of use in positive pressure, an annular seal part 72 is engaged with a first engaged part 43a so as to restrict movement of a gasket 6. At the time of use in negative pressure, an engaging projection 73 is engaged with a second engaged part 43b so as to restrict movement of the gasket 6. Position slide of the gasket 6 is surely prevented even when strong fastening force is not applied by a tie rod and the like. It is thus possible to prevent the gasket 6 from slipping off into a flow passage forming hole 22 caused by position slide, and it is also possible to hold suitable sealing property at the time of negative pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure between members, for example, a seal structure in which a gasket is interposed between valve blocks forming an electromagnetic valve manifold.

[0002]

2. Description of the Related Art Heretofore, there has been known an electromagnetic valve manifold having a large number of manifold blocks arranged in series. Each such manifold block is composed of an electromagnetic valve and a valve block (manifold base) for supplying and discharging a fluid such as pressurized air thereto. Each valve block of this type has a plurality of flow passage forming holes.
Since the positions of the flow passage forming holes correspond to each other, when a plurality of valve blocks are joined, a flow passage is formed through them. Further, a gasket having a communication hole is interposed between the joint surfaces of the valve block, thereby improving the sealing property of the interface. Here, a conventional gasket is illustrated in FIGS. 12 and 13.

A conventional example of FIG. 12 is a string-shaped gasket 101, and a plurality of annular seal portions 103 having communication holes 102.
It has a structure in which thin strings 104 are connected. FIG.
The conventional example is a plate-shaped gasket 105, which has a structure in which communication holes 102 are provided at a plurality of locations in a plate-shaped base 106 having no unevenness.

[0004]

By the way, when the manifold block is connected to the air supply source and pressurized air is supplied, the inside of the flow path becomes a positive pressure. Conversely, when the manifold block is connected to a vacuum pump or the like to perform vacuuming, the inside of the flow path becomes negative pressure. However, in the latter case, the gaskets 101 and 105 are sucked into the flow path forming holes, so that the gaskets 101 and 105 are displaced. For this reason, the gaskets 101 and 105 are likely to drop from a predetermined position, and there is a problem that a suitable sealing property cannot be maintained at the time of negative pressure.

Therefore, in order to prevent such positional displacement, it is necessary to apply a strong tightening force to the gaskets 101 and 105 by inserting a connecting tool such as a tie rod into the valve block. However, in order to adopt this method, not only a connecting tool is required, but also a hole for inserting the connecting tool is required to be formed.

Further, a string-shaped gasket 101 shown in FIG.
It is considered that, as a measure for preventing the positional deviation, the holding groove may be formed in the joint surface of the valve block and the string-shaped gasket 101 may be held in the holding groove. However, when the valve block is downsized, it is necessary to make the holding groove thin, and in this case, there is a problem that it is extremely difficult to integrally form the holding groove by die casting.

The present invention has been made in order to solve the above problems, and a first object of the present invention is to provide a suitable sealing property at the time of negative pressure even though a strong tightening force is unnecessary. It is an object of the present invention to provide a seal structure between members that can be maintained even in.

A second object of the present invention is to provide a seal structure between members which is easier to manufacture.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 forms a flow path in which a gasket is interposed between the joint surfaces of a plurality of members and the joint surfaces are open. In a seal structure that forms a flow path by a hole and a communication hole of the gasket, a first engaging portion provided near the opening edge of the communication hole, and provided near the opening edge of the flow path forming hole A first engaged portion with which the first engaging portion engages at the time of positive pressure, a second engaging portion provided near the opening edge of the communication hole, and an opening edge of the flow path forming hole. A gist is a seal structure between members, which is provided in the vicinity and includes a second engaged portion with which the second engaging portion engages when a negative pressure is applied.

According to a second aspect of the invention, in the first aspect, the both engaging portions are provided on the same surface side of the plate-shaped base portion of the gasket. According to a third aspect of the present invention, in the second aspect, the first engaging portion is provided so as to project over the entire circumference of the opening edge of the flow path forming hole in the plate-shaped base portion. The second engaging portion is provided at a position surrounding the first engaging portion.

According to a fourth aspect of the present invention, in the third aspect, an annular convex portion is provided so as to surround the opening edge of the flow path forming hole on the joint surface, and an inner peripheral surface of the annular convex portion is provided. The side was the first engaged portion, and the outer peripheral surface side was the second engaged portion.

The operation of the invention described in each of the above claims will be described below. According to the invention described in claims 1 to 4, when used under positive pressure, the movement of the gasket is restricted by the engagement of the first engaging portion with the first engaged portion. Also,
When used under negative pressure, the movement of the gasket is restricted by the engagement of the second engaging portion with the second engaged portion.
Therefore, the displacement of the gasket can be prevented without applying a strong tightening force. Therefore, the gasket does not fall into the flow path forming hole due to the positional deviation,
A suitable sealing property is maintained even under negative pressure.

According to the second aspect of the invention, since both engaging portions are provided on the same surface side of the plate-shaped base portion of the gasket, it is possible to make the other surface side of the plate-shaped base portion flat. . Therefore, the manufacture of the gasket is facilitated.
Further, in the case of such a structure, the front and back of the gasket can be easily discriminated, and the assembling property is improved.

According to the third aspect of the invention, since the second engaging portion is located at the position surrounding the first engaging portion, the gasket is less likely to be deformed. Therefore, the displacement can be prevented more reliably.

According to the fourth aspect of the invention, when used under positive pressure, the movement of the gasket is restricted by the engagement of the first engaging portion with the inner peripheral surface side of the annular convex portion. . Further, when used under negative pressure, the movement of the gasket is restricted by the second engaging portion engaging with the outer peripheral surface side of the annular convex portion. That is, if the annular convex portion is formed, the displacement of the gasket is prevented during both positive pressure and negative pressure. Further, such an annular convex portion can be formed at the same time when the member is formed by a die forming method such as die casting. Therefore, even when such a method is adopted, the member can be easily manufactured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will be described below with reference to FIGS. For convenience of explanation, the front side in FIG. 1 is the front side of the solenoid valve manifold 1, the right side is the right side, and the left side is the left side.

1 and 2 show a solenoid valve manifold 1. As shown in FIG. 3, the solenoid valve manifold 1
Is configured by connecting the supply / discharge end block 2, the wiring block 3, the plurality of manifold blocks 4 and the end block 5. The supply / discharge end block 2, the wiring block 3, each manifold block 4, and the end block 5 are connected to each other by a connecting member 7 with a gasket 6 interposed therebetween. An integrated wiring cover 8 is attached to the rear side of the solenoid valve manifold 1. The connecting member 7 is composed of an outer connecting plate 65, an inner connecting plate 66 and a connecting bolt 67.

The supply / discharge end block 2 is provided with a central air supply port 9, a first central exhaust port 10, a second central exhaust port 11, a central pilot exhaust port 12 and a central external pilot air supply port 13.

The wiring block 3 is a central air supply passage 1.
4, a first central exhaust passage 15, a second central exhaust passage 16, a central pilot exhaust passage 17, and a central external pilot air supply passage 18. The centralized flow paths 14 to 18 communicate with the centralized ports 9 to 13 of the supply / discharge end block 2. That is, the central air supply passage 14 is the central air supply port 9
Is communicated to. Further, the first central exhaust passage 15 has the first
The second central exhaust passage 16 is communicated with the central exhaust port 10
Are communicated with the second central exhaust port 11. The centralized pilot exhaust passage 17 communicates with the centralized pilot exhaust port 12, and the centralized external pilot air supply passage 18 communicates with the centralized external pilot air supply port 13.

The manifold block 4 includes a valve block 19 and an electromagnetic directional control valve (hereinafter simply referred to as an electromagnetic valve) 2
It is composed of 0 and. The valve block 19 and the solenoid valve 20 are connected via a gasket 21.

The valve block 19 has a flow passage forming hole 22 serving as a concentrated air supply passage, a flow passage forming hole 23 serving as a first concentrated exhaust passage, a flow passage forming hole 24 serving as a concentrated second exhaust passage, and a centralized exhaust passage. A flow passage forming hole 25 serving as a pilot exhaust flow passage and a flow passage forming hole 26 serving as a concentrated external pilot air supply passage are provided.
The flow passage forming holes 22 to 26 communicate with the concentrated flow passages 14 to 18 of the wiring block 3. That is, the flow passage forming hole 22 serving as the central air supply passage is communicated with the central air supply passage 14. The flow passage forming hole 23 serving as the first concentrated exhaust flow passage communicates with the first concentrated exhaust port 15, and the flow passage forming hole 24 serving as the second concentrated exhaust flow passage communicates with the second concentrated exhaust port 16. . The flow passage forming hole 25 serving as a centralized pilot exhaust flow passage communicates with the centralized pilot exhaust flow passage 17, and the flow passage forming hole 26 serving as a centralized external pilot air supply passage communicates with the centralized external pilot air supply passage 18. .

As shown in FIG. 1, the valve block 19 has an output A port 27 and an output B port 2 on its front side.
8 is provided. Both output ports 2 of each valve block 19
7, 28 are connected in a pair to an external actuator (not shown).

Further, the valve block 19 has an air supply hole 29, a first exhaust hole 30, a second exhaust hole 31, an output A hole 32, an output B hole 33, and a pilot exhaust hole (not shown) on its upper surface.
And a pilot air supply hole (not shown). The holes 30 to 33 are in communication with the flow path forming holes 22 to 26, respectively. That is, the air supply hole 29 is the flow path forming hole 22 that serves as a central air supply flow path, the first exhaust hole 30 is the flow path forming hole 23 that is the first exhaust flow path, and the second exhaust hole 31 is the second exhaust gas. The output A hole 32 is connected to the output A port 27, and the output B hole 33 is connected to the output B port 28 in the flow path forming hole 24 serving as a flow path. Further, the pilot exhaust hole is communicated with the flow channel forming hole 25 serving as the central pilot exhaust flow channel, and the pilot air supply hole is communicated with the flow channel forming hole 26 serving as the centralized external pilot air supply channel.

The solenoid valve 20 is a pilot-driven 5-port 2-position or 3-position solenoid directional control valve. Solenoid valve 20
On the lower side surface of the lower surface, the air supply hole 29, the first exhaust hole 30, the second
Seven ports (not shown) communicating with the exhaust hole 31, the output A hole 32, the output B hole 33, the pilot exhaust hole and the external pilot air supply hole are opened.

The end block 5 is similar to the end block 2 in the flow passage forming holes 22 of the valve blocks 19.
It has a port communicating with ~ 26. Each solenoid valve 20 of each manifold block 4 is connected to the wiring block 3 and a feeder line with connectors on both sides (hereinafter, simply referred to as a feeder line) 34. The solenoid valve 20 is connected to the solenoid valve side connector 35 of the power supply line 34.

The wiring block 3 inputs a drive signal corresponding to each solenoid valve 20 from an external sequencer or the like. The wiring block 3 outputs each drive signal to each solenoid valve 20 via the power supply line 34 connected to the corresponding solenoid valve 20.

Each solenoid valve 20 outputs the air supply hole 29 of the valve block 19 connected by the drive signal to the output A hole 32.
And the output B hole 33 communicates with the second exhaust hole 31. Further, the solenoid valve 20 connects the air supply hole 29 to the output B hole 33 by the drive signal and outputs the output A hole 32.
To the first exhaust hole 30.

Therefore, the solenoid valve manifold 1 supplies the air supplied from the central air supply port 9 to each valve block 19.
Introduced into the central air supply passage 22 of. Then, the air is led to the outside from one of the output A port 27 and the output B port 28 of each valve block 19. At the same time, the solenoid valve manifold 1 introduces air from the other output port 27, 28. Then, the air is supplied to the first central exhaust passage 23 or the second central exhaust passage 24 of each valve block 19 from the first central exhaust passage 23.
It is led to the central exhaust port 10 or the second central exhaust port 11.

Next, the structure of the valve block 19 will be described with reference to FIGS.
Details will be described with reference to FIG. The valve block 19 is formed by die casting of an aluminum alloy. FIG.
1 shows one joint surface 19a of the valve block 19. Each of the flow path forming holes 22 to 26 has the joint surface 19
Open at a. The joint surface 19a includes a first engaged portion 43a and a second engaged portion 43b, respectively. That is, the flow path forming holes 22 to 2 are formed in the joint surface 19a.
A sealing recess having a substantially circular shape or a substantially elliptical shape is formed in the vicinity of the opening edge of 6, and the bottom surface thereof serves as the sealing surface 42. The annular projections 4 are formed on the outer circumferences of these sealing recesses.
3 is projected. The annular convex portion 43 has the joining surface 19
In a, the opening edges of the flow path forming holes 22 to 26 are surrounded all around. Then, in the present embodiment, the inner peripheral surface side of the annular convex portion 43 functions as the first engaged portion 43a,
Moreover, the outer peripheral surface side thereof functions as the second engaged portion 43b. In addition, a concave engagement portion 44 is formed in a further outer peripheral region of the annular convex portion 43. Further, the upper surface of the annular convex portion 43 is recessed from the joint surface 19a.

FIG. 4 shows the other joint surface 19b of the valve block 19. The valve blocks 19 are connected to each other in a state where the joint surface 19a and the joint surface 19b are in contact with each other. As shown in FIG. 3, the valve block 19 is provided with the holes 29 to 33 and the like on its upper side surface. further,
As shown in FIGS. 4 and 5, the valve block 19 includes connecting portions 54, respectively on the front and rear portions of the respective joint surfaces 19a, 19b.
55. By fixing the connecting member 7 to these connecting portions 54 and 55, the wiring block 3 and the valve block 19, the valve blocks 19 each other, the valve block 19 and the end block 2, or the valve block 19 and the end block 5 are connected to each other. To be done.

Next, the structure of the gasket 6 interposed between the valve blocks 19 will be described in detail with reference to FIGS. As shown in FIG. 7, the gasket 6 includes a plate-shaped base portion 70. In this plate-like base portion 70, the flow path forming holes 22, 23, 2 are formed.
Three communication holes 71 capable of communicating with the No. 4 are formed. FIG.
As shown in, the plate-shaped base portion 70 has an annular seal portion 72 as a first engaging portion. The number of annular seal portions 72 is three, and they are provided so as to project over the entire circumference at the opening edge of each communication hole 71 of the plate-shaped base portion 70. These annular seal portions 72 are present on the upper surface side in FIG. The annular seal portion 72 follows the outer shape of the sealing recess. Then, the outer side surfaces of these annular seal portions 72 can be engaged with the first engaged portion 43a (that is, the inner peripheral surface side of the annular convex portion 43) when used under positive pressure.

Further, the plate-shaped base portion 70 is provided with a plurality of engaging protrusions 73 as second engaging portions. The engagement protrusion 73
Are projectingly provided at positions on the plate-shaped base portion 70 so as to substantially surround each annular seal portion 72. The engagement ridge 73 is a complete annular shape or an incomplete annular shape, and has the same center as the annular seal portion 72. Then, these engaging protrusions 73
The inner side surface of the second engaged portion 43b during use under negative pressure.
(That is, the outer peripheral surface side of the annular convex portion 43) can be engaged. The engaging projection 73 is present on the same side as the annular seal portion 72, that is, on the upper surface side in FIG. Therefore,
The gasket 6 of this embodiment has unevenness only on the upper surface,
The bottom side is flat. Then, as shown in FIG. 9, each of the annular seal portions 72 has a corresponding one of the engaging projections 7.
The protrusion amount is larger than 3. Further, the gasket 6 is formed with a communication hole 74 capable of communicating with the flow path forming holes 25 and 26. An annular seal portion 75 is also provided on the opening edge of each communication hole 74 so as to project over the entire circumference.

Then, as shown in FIG. 9, when the gasket 6 is mounted at a predetermined position on the joint surface 19a of the valve block 19, the annular seal portions 72 and 75 come into contact with the corresponding seal surfaces 42. At this time, the respective engaging protrusions 73 are fitted in the corresponding concave engaging portions 44. In this state, when the joint surface 19b of another valve block 19 is aligned with the joint surface 19a of the valve block 19, the annular seal portions 7 are formed.
2,75 heads are pressed against each sealing surface 42. Therefore, the corresponding flow path forming holes 22 to 26 of each valve block 19 are formed.
Are communicated in a sealed state, and the corresponding flow path forming holes 22
26 to 26 and the communication holes 71, 74 form a flow path.

Next, the actions and effects of the solenoid valve manifold 1 configured as described above will be listed below. (A) In the solenoid valve manifold 1 of the present embodiment, the gasket 6 including the annular seal portion 72 as the first engaging portion and the engaging protrusion 73 as the second engaging portion is used. In addition, the first engaged portion 43a and the second engaged portion 4
The valve block 19 in which the annular convex portion 43 having 3b is provided on the joint surface 19a is used. And these constitute the seal structure between the valve blocks 19. Therefore, when used under positive pressure, the movement of the gasket 6 is restricted by the annular seal portion 72 engaging with the first engaged portion 43a. Further, when used under negative pressure, the engagement protrusion 73 engages with the second engaged portion 43b, so that the movement of the gasket 6 is restricted. Therefore, even if a strong tightening force is not applied by the tie rod or the like, the displacement of the gasket 6 is surely prevented. Therefore, the gasket 6 does not fall into the flow path forming holes 22 to 26 due to the positional deviation, and the suitable sealing property can be maintained even when the negative pressure is applied.

Further, with this seal structure in which the displacement is unlikely to occur, it is not necessary to connect the valve block 19 with a strong tightening force using a connecting tool such as a tie rod, and the connecting tool insertion hole is provided. Is also unnecessary. Therefore, the configuration can be simplified and the cost can be reduced accordingly. It also contributes to preventing the valve block 19 from becoming large.

(B) In the seal structure of this embodiment, the annular seal portion 72 and the engaging projection 73 are provided on the same surface side of the plate-like base portion 70 of the gasket 6. Therefore, the other surface side of the plate-shaped base portion 70 becomes flat, which facilitates the manufacture of the gasket 6. Further, in the case of such a structure, the front and back of the gasket 6 can be easily discriminated, and even when the gasket 6 is attached to the joint surface 19a, the operator does not make a mistake and the assembling work is extremely easy. Become. Therefore, the assembling property can be improved.

(C) In the seal structure of the present embodiment, the engaging projection 73 is provided so as to project from the plate-shaped base portion 70 at a position surrounding the annular seal portion 72. Therefore, the engagement protrusion 73 is located farther from the flow path than the annular seal portion 72, and the flow path is not narrowed compared to the case where this positional relationship is reversed. Therefore, the displacement of the gasket 6 can be more surely prevented without narrowing the flow path. Also possible seal 7
Since 2 is provided so as to project over the entire circumference of the opening edge, a suitable sealing property is ensured with the sealing surface 42.

(D) In the seal structure of this embodiment, the annular convex portion 43 is provided so as to project, and the inner and outer peripheral surfaces thereof function as the first engaging portion 43a and the second engaging portion 43b, respectively. Therefore, by providing the annular convex portion 43, it is possible to prevent the displacement of the gasket 6 during both positive pressure and negative pressure. Further, such an annular convex portion 43 can be formed at the same time when the valve block 19 is formed by a die forming method such as die casting. Therefore, even when such a method is adopted, the valve block 19 can be easily manufactured.
Therefore, it is superior to the prior art in which it is necessary to form a thin holding groove on the joint surface as a measure for preventing the displacement.

The present invention is not limited to the above embodiment, but may be configured as follows. In the gasket 81 of another example of FIG. 10, the protruding directions of the annular seal portion 72 as the first engaging portion and the engaging protrusion 73 as the second engaging portion are different. That is, in the figure, the former 72 exists on the joint surface 19a side and the latter 73 exists on the joint surface 19b side. A recess 82 is provided at a position corresponding to the engaging projection 73 on the joint surface 19b side. The inner side surface of the engagement protrusion 73 is engageable with the inner wall surface of the recess 82 (that is, the second engaged portion 82a). On the other hand, the annular convex portion 43 is omitted on the joint surface 19a side, and instead the inner side surface of the sealing concave portion functions as the first engaged portion 42a. Even with such a structure, it is possible to maintain a suitable sealing property at the time of negative pressure, although a strong tightening force is unnecessary.

In the gasket 91 of another example shown in FIG. 11, the engaging projection 73 which is the second engaging portion is omitted. Then, instead of this, a convex portion 92 is provided on the joint surface 19b side. Since the convex portion 92 is fitted in the communication hole 71, the inner peripheral surface side of the annular seal portion 72 can be engaged with the side surface of the convex portion 92. That is, the side surface of the convex portion 92 functions as the second engaged portion 92a, and the annular seal portion 72 also serves as the second engaging portion. Even with such a structure, it is possible to maintain a suitable sealing property at the time of negative pressure, although a strong tightening force is unnecessary.

The first engaging portion and the second engaging portion do not necessarily have to be protrusions, and may be protrusions, for example.
Further, the first engaging portion and the second engaging portion do not have to have a protruding convex shape, and may have a concave shape such as a groove or a dent.

The first engaging portion and the second engaging portion may be provided on only one side surface of the gasket 6, 81, 91, or may be provided on both side surfaces respectively.

The second engaging portion may be formed at a position surrounding the first engaging portion. The solenoid valve manifold 1 is not limited to air as in the embodiment, but may be for gases other than air, and may be for liquids such as water. That is, it can be used for various fluids.

The technical ideas other than the claims that can be understood from the above-described embodiments will be described below along with their effects. (1) In Claims 3 and 4, the second engaging portion is a complete annular or incomplete annular engaging ridge having the same center as the first engaging portion. With such an annular structure, displacement of the gasket can be more reliably prevented.

(2) In claims 3 and 4, the first
The engaging portion is formed so that the protruding amount is larger than that of the second engaging portion. With this structure, it is possible to secure a suitable sealing property between the first engaging portion and the members that are relatively largely protruding.

(3) Claims 1 to 4, technical ideas 1 and 2
2. The seal structure between members according to claim 1, wherein the member is a valve block having a plurality of flow passage forming holes at positions corresponding to each other. With this structure, although a strong tightening force is not required, it is possible to maintain a suitable sealing property between the valve blocks at the time of negative pressure.

(4) A gasket interposed between the joint surfaces of the valve blocks of the solenoid valve manifold, the first engaging portion for preventing positional deviation at positive pressure, and the positional deviation for negative pressure. And a second engaging portion for the solenoid valve manifold gasket. It is possible to provide a gasket that can maintain a suitable sealing property even when a negative pressure is applied, although a strong tightening force is unnecessary.

(5) In the technical idea 4, the gasket for the solenoid valve manifold is characterized in that both the engaging portions are provided on the same surface side of the plate-shaped base portion. With this configuration, it is possible to easily manufacture and have good assembling.

(6) In the technical idea 5, the first engaging portion is provided so as to project over the entire circumference of the opening edge of the flow path forming hole in the plate-shaped base portion, and the first engagement portion is formed in the plate-shaped base portion. The second portion is provided at a position surrounding the first engaging portion.
A gasket for a solenoid valve manifold, characterized in that the engaging portion of is protruded.

The technical terms used in this specification are defined as follows. "Fluids: nitrogen, oxygen, argon, carbon dioxide, hydrogen,
In addition to gas such as air which is a mixture of them,
For example, liquids such as water, alcohol, oil, and so-called critical fluids are also included. "

[0051]

As described in detail above, according to the inventions described in claims 1 to 4, although a strong tightening force is not required, a suitable sealing property is maintained even at the time of negative pressure. It is possible to provide a seal structure between members that can be used.

According to the second aspect of the invention, the manufacture of the gasket can be facilitated and the assembling property can be improved. According to the third aspect of the present invention, since the displacement of the gasket is more reliably prevented, it is possible to more surely maintain a suitable sealing property at the time of negative pressure. In particular, according to the invention described in claim 4, it is possible to provide the seal structure between the members which is easy to manufacture.

[Brief description of drawings]

FIG. 1 is a front view of a solenoid valve manifold according to an embodiment.

FIG. 2 is a perspective view of the solenoid valve manifold when viewed from the rear.

FIG. 3 is an exploded perspective view of the solenoid valve manifold when viewed from the rear.

FIG. 4 is a side view of one of the valve blocks.

FIG. 5 is another side view of the valve block.

6 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 7 is a front view of the gasket.

FIG. 8 is a sectional view taken along line BB in FIG.

FIG. 9 is an enlarged cross-sectional view of a main part of the valve block with a gasket attached.

FIG. 10 is an enlarged sectional view of a main part of a seal structure using a gasket of another example.

FIG. 11 is an enlarged cross-sectional view of a main part of a seal structure using a gasket of another example.

FIG. 12 is a plan view of a conventional string-shaped gasket.

FIG. 13 is a plan view of a conventional plate gasket.

[Explanation of symbols]

6, 81, 91 ... Gasket, 19 ... Valve block as member, 19a, 19b ... Joining surface, 22-26 ... Flow path forming hole, 43 ... Annular convex portion, 42a, 43a ... First engaged portion, 43b, 82a, 92a ... 2nd engaged part, 70 ...
Plate-shaped base portion, 71 ... Communication hole, 72 ... Annular seal portion as first engaging portion, 73 ... Engaging projection strip as second engaging portion.

Claims (4)

[Claims] 1. A seal structure in which a gasket is interposed between joint surfaces of a plurality of members, and a flow passage is formed by a passage forming hole that is open in both joint surfaces and a communicating hole of the gasket, the communicating hole. A first engaging portion provided near the opening edge of
A first engaged portion provided near the opening edge of the flow path forming hole and engaged with the first engaging portion at the time of positive pressure, and a second engaged portion provided near the opening edge of the communication hole. An inter-member comprising an engaging portion and a second engaged portion which is provided near an opening edge of the flow path forming hole and which engages with the second engaging portion when a negative pressure is applied. Seal structure. 2. The seal structure between members according to claim 1, wherein the both engaging portions are provided on the same surface side of the plate-shaped base portion of the gasket. 3. The plate-shaped base portion is provided with the first engagement portion projecting over the entire circumference of the opening edge of the flow path forming hole, and the plate-shaped base portion surrounds the first engagement portion. The seal structure between members according to claim 2, wherein the second engaging portion is provided at a position where the second engaging portion projects. 4. An annular convex portion is provided so as to surround the opening edge of the flow path forming hole on the joint surface, and the inner peripheral surface side of the annular convex portion serves as the first engaged portion. The seal structure between members according to claim 3, wherein the outer peripheral surface side is the second engaged portion.