JPH0417845Y2 - - 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.
The shell 1, which is open at both ends, is provided with a plug member 2 for sealing gas inside.

An inner tube 15 as shown in detail in FIG. 6 is inserted into the shell 1, and the inner tube 15 has both sides inside the shell 1 with a bladder fitted on the outside. 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. 5, with both ends being sandwiched between the cover member 4 and the cover members 4, 4.

Further, as shown in FIG. 6, the inner tube 15 is a first inner tube 16 made of aluminum.
In order to give the first inner tube 16 made of aluminum strength, the first inner tube 16 is made of aluminum.
and a second inner tube 18 made of iron that is inserted into the hollow part 17. The inner tube 16 made of aluminum has a cylindrical shape, and the central part is arranged in four equal parts in the outer circumferential direction, and the longitudinal direction is inclined. Face 19
A recess 19 is formed, and the bottom of this recess 19 communicates with the hollow part 17, so that the portion formed between the adjacent recesses 19 and 19 becomes a fin 20. The fins 20 are formed at four equal intervals in the circumferential direction.

Further, the second inner tube 18 made of iron
has a plurality of slits 21, 21, . . . on its circumferential surface.
... is formed and can be inserted into the hollow part 17 of the aluminum inner tube 16, and the hollow part 1 of the aluminum inner tube 16 is
When the iron inner tube 18 is inserted into the inner tube 7, each slit 21, 21, . . . provided in the iron inner tube 18 is located inside the recess 19 of the aluminum inner tube 16. It's becoming like that.

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 inner tube 18 made of iron through the holes 4a, 4a of the lid members 4, 4, and this pressure is applied to the inner tube 18 made of iron.
It acts on the inner surface of the bladder 3 through the slits 21, 21, . , when the pressure in the flow path is higher than the gas pressure, the bladder 3 is expanded, and when the pressure in the flow path is small, it is contracted, thereby reducing the pressure inside the flow path. They have learned to absorb change.

[Problem that the invention attempts to solve]

However, in the conventional accumulator configured as described above, the inner tube 16 made of aluminum forming the inner tube 15 disposed therein, the inner tube 18 made of iron, and the bladder 3 are The relationship with
As shown in the figure, for the structure in which the iron inner tube 18 is inserted into the hollow part 17 of the aluminum inner tube 16, the fins 20 formed in the aluminum inner tube 16 and the iron When a slight gap is created between the inner tube 18 and the circumferential surface of the inner tube 18, and the pressure within the flow path is equal to the pressure of the sealed gas, the bladder is in the state of changes to the state when the pressure in the flow path becomes small, and at this time, as shown in the enlarged view of FIG. If a part of the accumulator gets caught and this situation is repeated, the bladder in that part will crack and be damaged, which will reduce the durability of the accumulator. Ta.

This idea solves the problems of the conventional ones as mentioned above, and prevents a part of the bladder from getting caught between the fin and the iron inner tube, thereby preventing cracks from forming in the bladder. The object of the present invention is to provide an accumulator that can improve durability.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention includes a shell which is hollow and is provided with a plug member for sealing in gas, and which is disposed inside the shell.
The inner tube has a hollow shape and a bladder is fitted on the outside, and the inner tube has a hollow part with both ends open, and a spiral groove is bored in the inner peripheral surface of the hollow part. and a first inner tube having a longitudinal recess formed in its outer peripheral surface, the bottom surface of which communicates with the hollow part, and a fin formed between adjacent recesses; The hollow part of the first inner tube is inserted into the hollow part of the tube and has a hollow part communicating with the flow path, and a plurality of slits are bored in the circumferential surface, and the hollow part of the first inner tube is inserted in the outer circumferential surface. When the second inner tube is inserted into the hollow part of the first inner tube, the second inner tube has a spiral groove that matches the spiral groove provided in the first inner tube. and a coil spring housed inside a spiral hole composed of a spiral groove, and the bladder adjusts the pressure of the gas sealed between it and the shell according to the pressure in the flow path. This device employs a means configured to expand and contract against or in accordance with the

[Effect]

By adopting the above means of this invention,
When the pressure in the flow path fluctuates, the bladder expands and contracts in balance with the pressure of the gas sealed between it and the shell, and the pressure in the flow path becomes smaller than the pressure of the gas. In some cases, the bladder contracts and contacts the outer peripheral surface of the inner tube,
The coil spring is located inside the spiral hole formed between the fins, which are part of the aluminum inner tube, and the iron inner tube so that there is no gap between the fins, which are part of the aluminum inner tube, and the iron inner tube when they make contact. Therefore, there is no risk that part of the bladder will get caught in the gap between the two inner tubes, unlike in conventional models, so a large force will not be applied to a part of the bladder, causing damage due to localized force acting on the bladder. This means that it can definitely be prevented.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

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 an inner tube 6 made of aluminum and an inner tube 8 made of iron. Although it has the same shape as the inner tube 16, in the first inner tube 6 used in the accumulator according to this invention, a spiral groove 13 is bored in the hollow part 7, and this spiral groove The groove 13 is also formed on the inner surface of the fin 10 formed between the recesses 9 .

Further, even in the case of the second inner tube 8 made of iron, a spiral groove 13 provided in the hollow part 7 of the inner tube 6 made of aluminum is provided on the outer circumferential surface of the second inner tube 8 made of iron.
A spiral groove 14 with a pitch matching that of
Therefore, this spiral groove 14 has a plurality of slits 11, 1 bored so as to communicate with the inside.
1, ... is drilled across.

The inner tube 5 is formed by inserting the second inner tube 8 made of iron into the first inner tube 6 made of aluminum having the shape described above. A spiral groove 14 bored on the outer peripheral surface of the tube 8
When the coil spring 12 is placed inside the iron inner tube 8 and the iron inner tube 8 is then placed in the hollow part 7 of the aluminum inner tube 6, the iron inner tube 8 is positioned in the spiral groove 14 of the iron inner tube 8. Since the pitch of the coil spring 12 and the pitch of the spiral groove 13 bored in the hollow part 7 of the aluminum inner tube 6 match, screwing is possible, and thus the inner tube 5 is assembled. , this inner tube 5
A bladder 3 is disposed outside the shell 1, and after the bladder 3 is inserted into the inside of the shell 1, lid members 4, 4 are attached and fixed from both sides.

When the pressure of the gas sealed between the shell 1 and the bladder 3 is equal to the pressure of the flow path, the bladder 3 is in the state shown in FIG. When the pressure decreases, the state will be as follows, and at this time, as shown in the enlarged view in FIG.
Since the coil spring 12 is located between the fins 10 and the iron inner tube 8, there is no gap between the fins 10 and the iron inner tube 8, and as a result, a part of the bladder 3 is connected to the fins 20 and the iron inner tube 8, as in the conventional case. 18, no force is applied locally to the bladder 3, and therefore there is no possibility that the bladder 3 will crack and break. The durability of No. 3 will be significantly improved.

[Effect of idea]

By configuring this idea as described above,
When the bladder contracts when the pressure in the flow path becomes lower than the pressure of the sealed gas, a part of the bladder is caught in the gap between the fin and the iron inner tube, unlike in conventional models. Since no large force is applied locally to the bladder, the durability of the bladder is improved, and this has excellent effects such as significantly improving the durability of the accumulator itself. be.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the entire accumulator according to this invention, Fig. 2 is a schematic perspective view of the inner tube used in the one shown in Fig. 1, and Fig. 3
The figure is a schematic diagram showing the relationship between the iron inner tube, fins, and bladder, and Figure 4 is an enlarged view of Figure 3.
Fig. 5 is a schematic diagram showing the entire conventional accumulator, Fig. 6 is a schematic perspective view of the inner tube used in the conventional accumulator, and Fig. 7 is an iron inner tube used in the conventional accumulator. A schematic diagram showing the relationship between the fins and the bladder, FIG. 8 is an enlarged view of FIG. 7. 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...Coil spring, 13, 14...Spiral groove.

Claims (1)

[Scope of utility model registration request] A shell 1 having a hollow shape and provided with a plug member 2 for sealing gas; and an inner tube 5 disposed inside the shell 1, having a hollow shape and having a bladder 3 fitted on the outside thereof. The inner tube 5 has a hollow part 7 with both ends open, and a spiral groove 13 is bored in the inner peripheral surface of the hollow part 7, and a longitudinal depression is formed in the outer peripheral surface. A portion 9 is formed, the bottom surface of which communicates with the hollow portion 7, and a fin 1 is formed between adjacent recessed portions 9.
a first inner tube 6 in which 0 is formed;
It has a hollow part that is inserted into the hollow part 7 of the first inner tube 6 and communicates with the flow path,
Moreover, a plurality of slits 11 are bored in the circumferential surface, and a spiral groove 14 that matches the spiral groove 13 provided in the hollow part 7 of the first inner tube 6 is bored in the outer circumferential surface. When the second inner tube 8 is inserted into the hollow part 7 of the first inner tube 6, the spiral grooves 13 and 14 of both inner tubes 6 and 8 are formed. The bladder 3 resists the pressure of the gas sealed between it and the shell 1 according to the pressure in the flow path. An accumulator characterized in that it expands and contracts in sequence.