JPH0433443Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an accumulator, and in particular, to an in-line type accumulator that is resistant to high compression ratios.

[Prior art]

Generally, a conventional inline type accumulator is configured as shown in Fig. 4.
The shell 1, which is open at both ends, is provided with a plug member 2 for sealing gas inside.

Then, an inner tube 15 as shown in detail in FIG. The bladder 3 is held down by the lid members 4, 4, and therefore the bladder 3 is held down by the inner tube 15.
It is attached as shown in FIG. 4, with both ends being sandwiched between the cover member 4 and the cover member 4, 4.

Further, as shown in FIG. 5, the inner tube 15 is inserted into the hollow portion 17 of the first inner tube 16 in order to provide strength to the first inner tube 16. The first inner tube 16 has a cylindrical shape, and has four concave portions 19 arranged at equal intervals in the outer circumferential direction at the center and having inclined surfaces 19a, 19a in the longitudinal direction. The bottom of this recessed part 19 is connected to the hollow part 1.
7 and thus adjacent recessed portions 19,
The portion formed between 19 serves as fins 20, and these fins 20 are formed at four equal intervals in the circumferential direction.

Further, the second inner tube 18 has a plurality of slits 21, 21, . . . formed on its circumferential surface, and the first inner tube 16
The second inner tube 18 can be inserted into the hollow part 17, and when the second inner tube 18 is inserted into the hollow part 17 of the first inner tube 16, each slit 21, 21,
... is the recessed portion 1 of the first inner tube 16
It is designed to be located inside 9.

In the conventional accumulator configured as described above, gas is sealed between the shell 1 and the bladder 3 via the plug member 2 provided on the shell 1, and the both lid members 4 , 4 holes 4a,
4a into the flow path.

Then, when pressure fluctuation occurs in the flow path,
The pressure is introduced into the second inner tube 18 through the holes 4a, 4a of the lid members 4, 4, and this pressure causes each slit 21, 21, . . . acts on the inner surface of the bladder 3 through the membrane to balance the pressure of the gas sealed between the bladder 3 and the shell 1, such that the pressure within the flow path is greater than the pressure of the gas. In some cases, the bladder 3 is expanded, and when the pressure in the flow path is low, it is contracted, thereby absorbing pressure changes in the flow path.

The second inner tube 18 also has a plurality of holes 24, 24, . . . on its circumferential surface, as shown in FIG.
Although there are some with slits 21, 21, .

[Problem that the invention attempts to solve]

However, in the conventional accumulator configured as described above, when pressure fluctuation occurs in the flow path as described above, the pressure changes to the second
Each slit 2 penetrated through the inner tube 18
1, 21, . . . and each hole 24, 24, . When the pressure is higher than the pressure in the flow path, it contracts, and when it is lower than the pressure inside the flow path, it expands. When this is done frequently, the bladder 3 Second
In the former case, if the surfaces of the inner tubes 16 and 18 receive a severe impact, or if the fluid in the flow path enters and exits at a rapid rate, the first and second inner tubes 16 and 18 will not only receive the impact, but also
If the surface of 18 is rough, or if the slits 21, 2
1,... or the burrs on the surface facing the holes 24, 24,... may cause the bladder to be worn or damaged, shortening its lifespan, and in the latter case, the bladder 3 may become twisted. The problem is that the bladder is scratched by the first and second inner tubes 16 and 18, which also have rough surfaces, which is extremely unfavorable for the bladder.

In view of the above-mentioned problems, the present invention coats the surfaces of the first and second inner tubes with resin to soften the impact between the bladder and the first and second inner tubes, and to improve the slippage. An object of the present invention is to provide an accumulator with improved durability.

[Means for solving problems]

In order to solve the above problems, the present invention includes a shell that is hollow and is provided with a plug member for sealing gas, and an inner tube that is disposed inside the shell and has a bladder fitted therein. and
The inner tube has a hollow portion with both ends open, and a plurality of recessed portions communicating with the hollow portion and opening outward are formed at intervals in the circumferential direction, and a fin is provided between each recessed portion. A first inner tube is formed, the first inner tube is inserted into the hollow part of the first inner tube, a plurality of through holes are formed on the circumferential surface, and a resin coating is applied to the outer circumferential surface. The accumulator is characterized in that a through hole is formed from a second inner tube communicating with the recess.

[Effect]

The present invention employs the above-mentioned means, so that when the pressure within the flow path fluctuates, the bladder expands and contracts in balance with the pressure of the gas sealed between it and the shell, thereby reducing the flow. When the pressure in the passage becomes lower than the pressure of the gas, the bladder contracts and comes into contact with the outer circumferential surface of the inner tube, but at this time, the outer circumferential surfaces of the first and second inner tubes are covered with resin. Since the coating is applied, the outer peripheral surfaces of the first and second inner tubes, the slits,
Since the corners of the holes and the like are covered with a coating, the corners are prevented from rubbing.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire accumulator according to this invention, and the same members as those of the conventional one are given the same numbers and detailed explanations will be omitted.

As shown in FIG. 2, the inner tube 5 has a first inner tube 6 and a second inner tube 8, and the first inner tube 6 is different from the conventional first inner tube 16 made of aluminum. Although they have the same shape, on the outer side and side surface of the fin 10 and on the inclined surface 9a of the recessed part 9,
Apply resin coating 12. The resin of the resin coating 12 at this time is Teflon, and the thickness is
The thickness shall be 30μm.

Furthermore, the resin coating 12 is applied to the outer peripheral surface of the second inner tube 8 as well.
At this time, the portions facing the slits 11, 11, . . . are chamfered to eliminate the presence of burrs, etc.

In addition, a plurality of holes 14, 1 are formed on the surface of the second inner tube 8 as shown in FIG.
4, . . . , the resin coating 12 is applied in the same manner, and the holes 14, 14, .
Be sure to chamfer the areas that face...

The first and second inner tubes 6 as described above,
The inner tube 5 is formed by assembling the inner tube 8, and the bladder 3 is disposed outside the inner tube 5. Furthermore, after the bladder 3 is inserted into the inside of the shell 1, the lid members 4, 4 are attached and fixed from both sides. It is something.

In this accumulator, when the holes 4a, 4a are connected to the flow path, when a pressure fluctuation occurs in the flow path, the bladder 3 expands or contracts as described above to compensate for the pressure fluctuation in the flow path. During expansion and contraction, the bladder 3 comes into contact with the inner tube 5, and as mentioned above, the surface of the inner tube 5 that can come into contact with the bladder 3 has slits 11, 11, . . . Hole 14, 14,...
Since the entire outer periphery, including the surface facing the inner surface, is coated with resin, the impact is softened and the bladder 3 is prevented from being damaged, damaged, or worn even if rubbed against it. Since the tube 5 does not deform, no unreasonable force is applied to the bladder, thus improving the durability of the bladder.

[Effect of idea]

This invention has the above configuration, so that
Since the surface of the inner tube is coated with resin, the contact resistance with the bladder during contraction is reduced, and breakage, damage, and abrasion are avoided, especially on the surface facing the slit or hole. It has excellent effects such as alleviating the large resistance that is applied, improving the durability of the bladder, and achieving it with simple processing.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the entire accumulator according to the present invention, Fig. 2 is a schematic perspective view of an inner tube used in the one shown in Fig. 1, and Fig. 3 is a second implementation of the second inner tube. FIG. 4 is a schematic diagram showing the entire conventional accumulator, FIG. 5 is a schematic perspective view of an inner tube used in the conventional accumulator, and FIG. 6 is a conventional second inner tube and other parts. FIG. 1... Ciel, 2... Plug member, 3... Bladder,
4... Lid member, 5, 15... Inner tube,
6, 16...1st inner tube, 7, 17...
...Hollow part, 8, 18...Second inner tube,
9, 19... recess, 10, 20... fin, 1
1, 21... slit, 12... resin coating, 14, 24... hole.

Claims (1)

[Scope of utility model registration request] The inner tube 5 includes a shell 1 which is hollow and is provided with a plug member 2 for sealing gas, and an inner tube 5 disposed inside the shell 1 and into which a bladder 3 is fitted. has a hollow part 7 that is open at both ends, and a plurality of recessed parts 9 communicating with the hollow part 7 and opening outward are formed at intervals in the circumferential direction, and a fin is formed between each recessed part 9. 1
a first inner tube 6 in which 0 is formed;
It is inserted into the hollow part 7 of the first inner tube 6, and has a plurality of through holes 11, 14 on the circumferential surface.
is formed, and a resin coating 1 is formed on the outer peripheral surface.
2, and the through holes 11 and 14 are formed from a second inner tube 8 communicating with the recess 9.