JPH055329Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field The present invention relates to pressure vessels.

Prior Art A pressure vessel has been considered that includes a resin outer wall to which differential pressure is applied on both sides, and an insert member embedded in the outer wall by integral molding with both end faces exposed on both sides of the outer wall. . For example, this is described in Utility Application No. 116110/1987, which was previously filed by the present applicant. In such a pressure vessel, a microscopically small gap tends to occur between the outer wall and the insert member, so in order to seal the gap between the two, a paste-like sealer or the like is applied to the boundary between the two exposed to the high pressure side. It is being applied.

Problems to be solved by this invention However, in such a pressure vessel, it is unavoidable that the number of manufacturing steps for the pressure vessel increases due to the separate application process of sealer, etc.;
There have been cases where it has not been possible to reliably seal between the outer wall and the insert member due to misalignment of the application position of the sealer or the like, variations in the amount of application, or the like.

Means for Solving the Problems The present invention was developed against the background of the above circumstances, and its purpose is to securely connect the outer wall and the insert member without increasing the number of manufacturing steps. The object of the present invention is to provide a pressure vessel that can be sealed. In order to achieve this object, the present invention provides a pressure vessel as described above, in which the insert member is divided into a first member and a second member, and the outer circumferential surfaces of the first member and the second member are Further, an annular convex portion protruding toward the outer circumference is provided in a portion located within the outer wall, and between the first member and the second member, the shaft center of the insert member and The present invention is characterized in that an elastic member is provided which biases both members in the direction of separating them from each other when the members are compressed in parallel directions and the compressive pressure is released after the integral molding.

Effect of operation and invention In this way, the insert member is buried in the outer wall by integral molding with the elastic member being compressed in the direction parallel to the axis of the insert member by the first member and the second member, When the constriction pressure is released after integral molding, the elastic return force of the elastic member urges the first member and the second member in a direction to separate them from each other. A state in which the surfaces of the annular convex portion facing the direction parallel to the insert member axis and located on both outer sides are pressed with a predetermined pressing force against the inner surface of the outer wall facing those surfaces. They can be brought into close contact with each other. As a result, it is possible to suitably seal between the outer wall and the insert member without applying a sealer or the like as in the past, so the process of applying a sealer or the like is not necessary, and the number of steps for manufacturing the pressure vessel can be reduced. The loss of sealing performance between the outer wall and the insert member due to misalignment of the application position of the sealer or variation in the amount of application, etc. is completely eliminated, and the space between the two can be more reliably sealed.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 2, 10 is a pressure vessel for air suspension. The pressure vessel 10 has a cylindrical shape with a bottom, and includes an outer cylinder part 12 made of resin and a partition part 14 made of resin that is integrally molded with the outer cylinder part 12 at an intermediate part in the axial direction. a metal inner cylinder part 16 airtightly fitted on the bottom side to a cylindrical part 15 protruding from one side in the axial direction of the outer cylinder part 12;
The part located on the inner periphery side is hermetically fixed to the end opposite to the bottom side of the inner cylindrical part 16 by welding, and the part located on the outer periphery side is hermetically fixed to one end part of the outer cylindrical part 12. It is configured to include a partition wall part 14 and a metal bottom wall part 18 facing the partition wall part 1.
A main chamber 20 is formed on the side opposite to the inner cylindrical portion 16 of 4 (lower side in FIG. 2), and an annular subchamber 22 is formed between the outer cylindrical portion 12 and the inner cylindrical portion 16.

The inside of the outer cylindrical part 12, more precisely, the inside of the outer cylindrical part 12 including the cylindrical protrusion 21 that integrally projects from the outer circumferential surface of the outer cylindrical part 12 in the outer circumferential direction, is shown in FIG. As shown in the figure, a connecting fitting 23 for supplying air into the main chamber 20 is integrally embedded during molding of the outer cylinder part 12, etc., with both end surfaces exposed on both the inner and outer surfaces of the outer cylinder part 12. ing. In this embodiment, the outer cylindrical portion 12 constitutes an outer wall, and the connecting fitting 23 constitutes an insert member. The bottom side of the inner cylinder part 16 is exposed into the main chamber 20 through a hole 25 provided in the partition wall part 14, and a relatively large diameter through hole 24 is provided at the bottom of the inner cylinder part 16. In addition, a pair of relatively small-diameter through holes 26 are provided in the peripheral wall of the inner cylindrical portion 16 at positions facing each other. Communication is now allowed. For example, the pressure vessel 10 is disposed such that a shock absorber having a cylinder and a piston rod protruding from the inside thereof is inserted through the bottom wall portion 18.
It is fixed to the sprung member of the vehicle by a plurality of bolts 28 protruding from the end of the outer cylinder 12 opposite to the bottom wall 18 side (lower end in FIG. 2) and the spring of the vehicle. A predetermined elastic membrane is attached between the cylinder attached to the lower member, and a predetermined positive pressure is supplied into the main chamber 20 and the subchamber 22 via the connection fittings 23 as necessary. becomes.

As shown in an enlarged view in FIG. 1, the connection fitting 23 has a cylindrical shape as a whole, protrudes from an axially intermediate portion toward the outer circumference, and has a plurality of detents on the outer circumferential surface at predetermined intervals in the circumferential direction. A main body 36 has an annular protrusion 32 in which a groove 30 is formed and a through hole 34 penetrating in the axial direction, and a portion of the main body 36 on the side opposite to the main chamber 20 (in FIG. 1, the annular protrusion 32 The main chamber 2
An annular recess 42 having an annular convex portion 40 protruding toward the outer circumference on the zero side portion and opening toward the inner circumference on the end face on the main chamber 20 side.
An annular member 44 having an annular member 44 and an annular member 44 provided in the annular recess 42 and compressed in a direction parallel to the axis of the connecting fitting 23 between the bottom of the annular recess 42 and the annular convex portion 32 of the main body 36. It is configured to include a disc spring 48. The surfaces of the annular convex portions 32 and 40 facing the direction parallel to the axis of the connection fitting 23 and located on both outer sides are annular tapered surfaces 50 whose diameters become smaller toward both ends of the connection fitting 23. , 52. In this embodiment, the main body 36 constitutes one of the first member and the second member, and the annular member 44 constitutes the other of the first member and the second member.

The pressure vessel 10 configured as described above is manufactured, for example, in the following manner.

In FIG. 3, a recess 56 having a shape corresponding to the protrusion 21 is formed on the molding surface of the lower mold 54, and a stepped surface 58 is formed at the bottom of the recess 56.
The positioning pin 60 having a positioning pin 60 is fitted so as to be movable in the axial direction while being urged upward in FIG. 3 by a biasing means (not shown). As shown in the figure,
The positioning pin 60 is attached to the through hole 34 from the annular member 44 side. At this time, the main body 36 is placed on the stepped surface 58 of the positioning pin 60, and a predetermined gap is formed between the main body 36 and the annular member 44 in a direction parallel to the axis of the connecting fitting 23. Therefore, no load is applied to the disc spring 48. Next, the core 62 and the like for forming the main chamber 20 are placed between the lower mold 54 and an upper mold (not shown), and the upper mold is lowered, so that the upper mold and the core 62, the main body 36 and the positioning pin 60 are moved downward in the figure against the biasing force of the biasing means until the gap disappears.
The disc spring 48 is compressed by the main body 36 and the annular member 44 with a predetermined constriction pressure in a direction parallel to the axis of the connecting fitting 23 . Next, in this state, the molten resin is filled and cooled, thereby obtaining the pressure vessel 10 in which the connecting fitting 23 is embedded in the outer cylinder part 12 by integral molding, as shown in FIG. Then, the upper mold is raised and the pressure vessel 10 is taken out from the lower mold 54, core 62, etc.
When the constricting force exerted on the disc spring 48 by the main body 36 and the annular member 44 is released, the main body 36 and the annular member 44 are urged away from each other by the elastic restoring force of the disc spring 48 itself. At this time, although not shown in FIGS. 1 and 2, a microscopically small gap is formed between the main body 36 and the annular member 44 in a direction parallel to the axis of the connecting fitting 23. ing.

As described above, according to this embodiment, when the constriction pressure is released after integral molding, the disc spring 4
8, the main body 36 and the annular member 4
4 are urged in the direction to separate from each other, the annular tapered surface 5 of the main body 36 and the annular member 44
0 and 52 are brought into close contact with the inner surface of the outer cylinder portion 12 facing the annular tapered surfaces 50 and 52 with a predetermined pressing force, and there is no need to apply a sealer or the like as in the conventional case. Also, the space between the outer cylindrical portion 12 and the connecting fitting 23 is suitably sealed. The spring force of the disc spring 48 and the annular recess 42
The depth etc. are determined in advance. As a result, the process of applying a sealer or the like becomes unnecessary, and the manufacturing process of the pressure vessel 10 can be reduced, while
This eliminates the possibility that the sealing performance between the outer cylindrical portion 12 and the connecting fitting 23 would be impaired due to misalignment of the application position of the sealer or variation in the amount of application, etc., making it possible to seal more reliably between the two. be.

Further, according to this embodiment, the annular convex portions 32, 40
annular tapered surfaces 50, 5 whose diameters become smaller as the surfaces located on both outer sides move toward both ends of the connection fitting 23;
2, the annular tapered surfaces 50 and 52 have the advantage that even better sealing performance can be obtained.

In addition, in the above-mentioned embodiment, the annular convex portion 32,
Although the annular tapered surfaces 50 and 52 are formed on each of the annular tapered surfaces 40, the effects of the present invention can still be obtained even when the annular tapered surfaces 50 and 52 are not provided.

Further, in the above-described embodiment, the connecting fitting 23 is embedded in the outer cylindrical portion 12 with the annular convex portions 32 and 40 adjacent to each other in a direction parallel to the axis of the connecting fitting 23, but this is not necessarily necessary. Without,
For example, the effects of the present invention can be obtained even when the flange-shaped annular convex portions are buried at a predetermined distance from each other.

Further, in the above-described embodiment, the elastic member is constituted by the disc spring 48, but this is not necessarily necessary, and may be an elastic body such as a compression coil spring or rubber, for example.

Further, in the above-mentioned embodiment, the connecting fitting 23 is configured to have a main body 36 and an annular member 44 that is fitted to the outer peripheral surface of the small diameter portion 38 of the main body 36, but it is not necessary to configure it in this way. For example, the connection fitting 23 is divided into two parts in the direction perpendicular to the axis at the middle part in the axial direction, and the main chamber 2
It is also possible to configure it by having a first member located on the zero side and a second member located on the opposite side to the main chamber 20 side.

In addition, in the above embodiment, the connecting fitting 23 for supplying air into the main chamber 20 constitutes an insert member, but the insert member is integrally molded with both end surfaces exposed on both sides of the outer wall. For example, it may be a fixing bolt protruding from the pressure vessel or a predetermined insert member made of a material other than metal.

Further, in the above-mentioned embodiments, a pressure vessel for air suspension has been described, but it goes without saying that the present invention can be applied to other pressure vessels. In this case, it may be a pressure vessel used under negative pressure.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the main part of FIG. 2. FIG. 2 is a sectional view showing an example of a pressure vessel to which the present invention is applied. 3 and 4 are diagrams for explaining the manufacturing method of the pressure vessel shown in FIG. 2, and FIG. 3 shows the state before the disc spring is compressed, and FIG. It is a figure which shows the state where the disc spring was narrowly compressed. 10...Pressure vessel, 12...Outer cylinder part (outer wall),
23... Connection fitting (insert member), 32, 4
0... Annular convex portion, 36... Main body (one of the first member and the second member), 44... Annular member (the other of the first member and the second member), 48... Disc spring (elastic member).

Claims (1)

[Claims for Utility Model Registration] A resin outer wall to which differential pressure is applied on both sides, and an insert member embedded in the outer wall by integral molding with both end faces exposed on both sides of the outer wall. In the pressure vessel, the insert member is configured by being divided into a first member and a second member, and a portion extending in the outer circumferential direction on the outer circumferential surface of the first member and the second member and located within the outer wall. An annular convex portion protruding toward the insert member is provided between the first member and the second member, and the first member and the second member are compressed in a direction parallel to the axis of the insert member by both members during the integral molding, and are narrowed after the integral molding. A pressure vessel characterized by being provided with an elastic member that biases both members in a direction to separate them from each other when pressure is released.