JPH109389A - Sealing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer a sealing structure which permits certain judgement whether seal rings are fitted in respective ring-shaped recesses in the proper condition over the whole circumference. SOLUTION: One end of this sealing structure concerned is left open in a position shut off from the inside of a fluid pressure apparatus such as a compressed air drying device by seal rings 25 and 26 provided in ring-shaped recesses 35 and 36 while the other end is furnished with communication paths 39 and 42 leading to the atmosphere. Even when the seal rings 25 and 26 are installed in such a condition as partially extruding from the recesses 35 and 36, the pressure fluid in the apparatus leaks to outside the device via the paths 39 and 42, so that sensing this leakage permit certain judgement whether the seal rings 25 and 26 are fitted in the respective recesses 35 and 36 properly over the whole circumference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a seal structure.

[0002]

2. Description of the Related Art As a fluid pressure device, there is a compressed air drying device used for an air brake vehicle, for example, and the entirety thereof is shown in FIG. This is indicated as 1 as a whole, and its configuration is conventionally known, so a detailed description thereof will be omitted. After being purified and dried, the check valve 12 is opened and supplied to the internal space 9 of the cover member 4. Therefore, in order to prevent the compressed air in the compressed air drying device 1 from leaking outside the device,
Seal rings 5 and 6 are attached to the flange portion 2a of the main body 2 and the circular plate-shaped member 3, respectively, and the flange portion 2a of the main body 2, the plate-shaped member 3 and the flange portion 4 of the cover member 4 are attached.
a is integrally connected by a screw member 7.

In this seal structure, as shown in FIG. 9, annular recesses 15 and 16 are formed in a flange portion 2a and a plate-like member 3 of a main body 2, and seal rings 5 and 6 are mounted on these. The flange portion 2a of the main body 2 and the plate member 3, and the flange portion 4 of the plate member 3 and the cover member 4
a are airtightly connected to each other. After assembling the compressed air drying apparatus 1, the seal ring 15,
It is designed to check whether the sealing action by the device 16 is normal.

This inspection method is performed, for example, by the following method. First, the main body 2, the plate member 3, and the plate member 3
A soapy water is applied to the joints C ₁ and C ₂ (see FIG. 9) of the cover member 4 and the cover member 4, and then pressure (compressed air) is sent into the compressed air drying device 1. In this case, for example, a forgotten seal ring 5 is mounted against one of the annular recess 15 as shown in FIG. 10, soapy water was applied to the coupling portion C ₁ leaks air through these coupling surfaces It becomes foamy, and if the operator confirms this, poor sealing,
That is, it is determined that the product is defective. On the other hand, if the sealing ring 5, 6 as shown in FIG 9 is attached to the annular recess 15 and 16, coupling portions C ₁ since the air is not leaked,
Change in soapy water was applied to C ₂ are not observed, so that it is determined that the seal properly this check worker.

[0005]

However, in the above-described inspection method, it is possible to detect a defective seal due to the absence of the seal ring in the annular recess.
1 and FIG. 12, for example, one annular recess 1
In 5, when a part of the seal ring 5 is assembled in a state protruding from the annular recess 15, a sealing action is obtained to some extent at this time, so that it may be determined that the seal is normal. However, when shipped and used in this state, as shown in FIGS. 13 and 14, the seal ring 5 extends radially outward due to the effect of the internal pressure of the compressed air drying device 1 (the pressure in the internal space 8), Finally, there is a possibility that the sealing force is reduced and air leakage occurs. 12 and 14 are conceptual views of the seal ring 5 viewed from above with the upper part of the plate-like member 3 removed, and the size of each part does not correspond to FIG.

In addition, since the seal ring 5 is forcibly fixed with screws even though the seal ring 5 is not properly mounted, FIG.
As shown in FIG. 1, the seal ring 5 in which the step of the annular recess 15 has been cut is damaged there, and the sealing action may be impaired.

[0007] The present invention has been made in view of the above-described problems, and it is necessary to surely determine whether or not the seal ring is properly mounted over the entire circumference of the annular recess, as well as the sealing failure due to the non-installation of the seal ring. It is an object of the present invention to provide a seal structure which can be determined at a time.

[0008]

An object of the present invention is to provide a fluid pressure device in which the end surfaces of two members are joined to each other, and the inner wall of the annular recess is connected to the annular recess formed in one member. In a seal structure in which a seal ring elastically in contact with an end surface of a member is attached, and the two members are connected to each other to cut off communication between inside and outside of the fluid pressure device through both end surfaces, the one member has one end. The sealing structure is characterized in that a side opening is formed in a portion of the annular recess that is shut off from the inside of the fluid pressure device by the seal ring, and the other end is formed with a communication path that opens to the atmosphere.

[0009] Since the portion cut off from the inside of the fluid pressure device by the seal ring in the annular recess communicates with the entire circumference of the annular recess, the fluid pressure device is in a state where the seal ring partially protrudes from the annular recess. Is assembled, the fluid inside the fluid pressure device communicates with one end of the communication passage, so that the fluid can be detected at the other end of the communication passage. This makes it possible to reliably determine whether or not the seal ring is normally mounted on the entire circumference of the annular recess.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a seal structure according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a seal structure of a compressed air drying apparatus according to an embodiment of the present invention. Since the configuration of the compressed air drying device 21 is publicly known, a detailed description thereof is omitted. However, the compressed air introduced into the internal space 28 of the main body 22 is purified and dried through a filter chamber 30 and a drying chamber 31, and The stop valve 32 is opened to supply the gas to the internal space 29 of the cover member 24. As shown in FIG. 1 by enlarging a portion indicated by reference numeral A in FIG. 1, annular recesses 35 and 36 are formed in the flange portion 22a of the main body 22 and the circular plate-shaped member 23, respectively. Place 35, 3
6, seal rings 25 and 26 having a square cross section are attached to the flange portion 22 a of the main body 22, the plate-like member 23, and the flange portion 24 a of the cover member 24 so as to be integrally connected by a screw member 27.

The one annular recess 35 formed in the flange portion 22a of the main body 22 is formed by depressing the radially outer side of the bottom wall surface over the entire circumference as shown in FIG. An annular passage 37 is provided so that a space is formed between the annular recess 35 and the seal ring 25 over the entire circumference. Here, the seal ring 25 is shielded from the internal space 28 of the main body 22 by the seal points S ₁ and S ₂ . Further, a hole 38 is formed so that the annular passage 37 communicates with the atmosphere. The annular passage 37 and the hole 38 form a communication passage 39 in which one end according to the present invention is opened at a portion sealed in the annular recess 35 by the seal ring 25 and the other end is opened to the atmosphere.

On the other hand, the annular recess 36 formed in the circular plate-like member 23 similarly has an annular passage 40 formed by recessing the radially outer side of the lower wall surface over the entire circumference.
As a result, a space is formed between the annular recess 36 and the seal ring 26 over the entire circumference. Here, the seal points S ₃ and S ₄ of the seal ring 26 block the internal space 29 of the cover member 24. In addition, this annular passage 4
A hole 41 is formed so as to communicate with the atmosphere using the contact surface between the plate-shaped member 23 and the flange portion 22a of the main body 22. The annular passage 40 and the hole 41 form a communication passage 42 in which one end according to the present invention is opened at a portion sealed by the seal ring 26 in the annular recess 36 and the other end is opened to the atmosphere.

The compressed air drying apparatus 21 according to the present embodiment
Is constructed as described above. Next, this operation will be described.

In the process of assembling the compressed air drying apparatus 21, after the seal rings 25 and 26 are respectively mounted on the annular recess 35 of the main body 22 and the annular recess 36 of the plate-like member 23, a plurality of seal rings 25 (in the present embodiment, 5). The flange portion 22a of the main body 22, the plate-like member 23, and the flange portion 24a of the cover member 24 are integrally connected by the screw member 27 of the present embodiment.
Then, after assembling the compressed air drying device 21, it is checked whether the sealing action by the seal rings 25 and 26 is normal. This is performed by applying soapy water to the other ends C ₁ ′ and C ₂ ′ (see FIG. 2) of the communication passages 39 and 42 communicating with the atmosphere.

At this time, as shown in FIG. 4, if the seal ring 25 is forgotten to be attached to one of the annular recesses 35, the compressed air in the internal space 28 of the main body 22 is forced into contact with the flange 22a of the main body 22 and the plate. A gap between a coupling surface with the member 23,
It leaks to the atmosphere via the annular recess 35 and the communication passage 39.
Therefore, the soapy water applied to the inspection position C ₁ ′ becomes foamy, whereby a defective seal between the main body 22 and the plate member 23 is determined. On the other hand, as shown in FIG. 2, when the seal rings 25 and 26 are normally mounted in the annular recesses 35 and 36, respectively,
Since the communication between the air inside and outside the compressed air drying device 21 is cut off by the sealing action of 26, the inspection positions C ₁ ′ and C
_The soapy water applied to ₂ 'did not change, and it was judged to be good with this.

Next, as shown in FIGS. 5 and 6, for example, when the compressed air drying device 21 is assembled with a part of the seal ring 25 protruding from the annular recess 35, according to the present embodiment, , Compressed air from the internal space 28 of the main body 22 passes through the annular passage 37 and is guided to the hole 38 (see FIG. 6). That is, in a place where the seal ring 25 is not properly mounted in the annular recess, the annular passage therethrough is
The compressed air in the internal space 28 is introduced from here through the entire circumference of the annular passage 37 and guided to the hole 38. Therefore, the soapy water applied to the inspection position C ₁ ′ becomes foamy, and it is determined that the seal is defective. FIG. 6 is a conceptual view of the seal ring 25 viewed from above with the upper part removed from the plate member 23, and the size of each part does not correspond to FIG.

Although not shown, the seal ring 26 is not mounted on the other annular recess 36 or the annular recess 36 is not mounted.
Similarly, when the seal ring 26 is assembled with a part of the seal ring 26 protruding from the inner space 29 of the cover member 24,
Compressed air is guided to the hole 41 through the annular passage 40. Therefore, the soapy water applied to the inspection position C ₂ ′ becomes foamy, and it is determined that the seal is defective.

As described above, according to the seal structure of the compressed air drying device 21 of the present embodiment, the seal ring 2
In addition to detecting a defective seal due to the non-mounting of 5 or 26, even in a state where the seal is not properly mounted only partially, the defective seal can be reliably detected. , 36, it can be reliably determined whether or not the seal rings 25, 26 are properly mounted over the entire circumference. Further, according to the present embodiment, only the positions where the communication passages 39 and 42 are formed (in the present embodiment, _two inspection positions C ₁ ′ and C ₂ ′, one for each), for inspection. In this case, the inspection can be made easier and the working efficiency can be improved.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For example, in the above embodiment, the seal structure of the compressed air drying device 21 has been described as a fluid pressure device. However, the present invention is not limited to this, and pneumatic devices such as a filter device, a valve device, and an air cylinder, or a master cylinder may be used. For the seal structure of hydraulic equipment such as wheel cylinders,
The present invention is applicable.

In the compressed air drying apparatus 21 described in the above embodiment, the filter chamber 30 and the drying chamber 31 are fixed to the plate member 23, and the plate member 23 is fixed to the main body 22. Although the filter chamber 30 and the drying chamber 31 are fixed at a predetermined position in the cover member 24, the filter chamber 3 is not provided, and the filter chamber 3 is not provided.
The present invention can be applied to a compressed air drying apparatus in which the drying chamber 31 and the drying chamber 31 are directly fixed to the main body 22.

In the above embodiment, the seal rings 25 and 26 having a rectangular cross section are used, but a seal ring (O-ring) having a circular cross section may be used instead. In this case, as shown in FIG. 7, voids 45 and 46 are automatically formed in the annular recesses 35 and 36 by the O-rings 25 'and 26'. The holes 47 and 48 may be provided so as to communicate with. Accordingly, the communication passage according to the present invention is formed, and it is not necessary to form the annular passages 37 and 40 described in the above embodiment.

In the above embodiment, the communication path 39,
The holes 38 and 41 constituting the hole 42 are formed at one place with respect to the annular recesses 35 and 36, respectively. However, the number of holes 38 and 41 is not limited to this, and the number may be increased as appropriate according to the type and size of the fluid pressure device. Good.

In the above embodiment, the communication path 3
Although the annular passages 37 and 40 forming the parts 9 and 42 are formed by being depressed, for example, they may be subjected to a cutting process or may be formed in a mold in advance.

[0026]

As described above, according to the seal structure of the present invention, not only the seal failure due to forgetting to install the seal ring, but also whether or not the seal ring is normally mounted in the annular recess is determined. Can be reliably determined. In addition, this seal inspection can be performed more easily than before,
Work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a compressed air drying apparatus to which a seal structure according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is an enlarged view of a main part in FIG. 2;

FIG. 4 is a diagram for explaining the operation of the present embodiment, and is an enlarged sectional view showing a state in which one of the seal rings is not attached and the device is assembled.

FIG. 5 is a view for explaining the same operation, and shows one of seal rings.
FIG. 6 is an enlarged cross-sectional view showing a state in which one part of the device protrudes from the annular recess and the device is assembled.

FIG. 6 is a schematic plan view showing a state where a plate member and a cover member in FIG. 5 are removed.

FIG. 7 is an enlarged sectional view showing a modified example in which an O-ring is used as a seal ring.

FIG. 8 is a sectional view showing a seal structure of a conventional compressed air drying device.

FIG. 9 is an enlarged view of a portion A ′ in FIG. 8;

FIG. 10 is a diagram for explaining the operation of the conventional example, and is an enlarged sectional view showing a state in which the device is assembled without one of the seal rings attached.

FIG. 11 is a diagram illustrating the same operation, and is an enlarged cross-sectional view showing a state in which one of the seal rings partially protrudes from the annular recess and the device is assembled.

12 is a schematic plan view showing a state where a plate-like member and a cover member in FIG. 11 are removed.

13 is a diagram schematically illustrating the operation of the seal ring when the device is used in the state of FIG.

FIG. 14 is a schematic plan view showing a state where a plate-like member and a cover member in FIG. 13 are removed.

[Explanation of symbols]

 Reference Signs List 21 compressed air drying device 25 seal ring 26 seal ring 35 annular recess 36 annular recess 37 annular passage 38 hole 39 communication passage 40 annular passage 41 hole 42 communication passage

Claims (3)

[Claims] 1. A seal ring in which end faces of two members constituting a fluid pressure device are joined to each other, and an annular recess formed in one member is elastically contacted with an inner wall of the annular recess and an end surface of the other member. And a seal structure that cuts off communication between the inside and outside of the fluid pressure device through both end faces by connecting the two members, wherein the one member has one end having the seal ring in the annular recess. A communication passage that opens at a portion that is shut off from the inside of the fluid pressure device and that opens at the other end to the atmosphere. 2. The communication path includes an annular passage that forms a gap between the seal ring fitted to the annular recess over the entire circumference of the annular recess, and the annular passage always communicates with the atmosphere. The seal structure according to claim 1, wherein the seal structure has at least one hole to be made. 3. The annular passage is formed by depressing an inner wall of the annular recess.
The seal structure according to the above.