JPH04244603A - Accumulator and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide an accumulator in which a diaphragm for separating a liquid chamber from a gas chamber is not influenced by a thermal effect due to welding and the like, sealing property thereof is enhanced, and manufacturing workability is improved, and a manufacturing method thereof. CONSTITUTION:A fixing ring 10 for fixing a fitting end part 4A of a diaphragm 4 to a fitting part 9 between a lower case 2 and an upper case 3 is arranged, and an adhesive agent 21 is interposed from the upper part to a void part 22 between the fitting end part 4A and a fitting stepped part 2A of the lower case 2, while outside circumferential parts of the lower case 2 and the upper case 3 are welded to each other.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator and a method for manufacturing the same, and more particularly to an accumulator and a method for manufacturing the same that can improve the sealing performance of a diaphragm installed inside the accumulator.

0002

2. Description of the Related Art Accumulators have heretofore been used as pressure storage devices. For example, Utsukai Showa 58-170401
No., Utility Model No. 58-170402, Utility Model No. 60-102
No. 501, No. 62-12001, No. 61-5
No. 01, JP-A No. 54-52318, etc.

FIG. 5 shows an example of the structure of a conventional accumulator.
I will explain based on this. As shown in the figure, this accumulator 1 has a lower case 2 and an upper case 3, and a diaphragm 4 is provided inside the case to make the inside a first
It is divided into a pressure chamber such as a liquid chamber 5 and a second pressure chamber such as a gas chamber 6. Lower case 2 has 1st
The upper case 3 is formed with a second pressure introduction connection part, such as a liquid introduction connection part 7, and a second pressure introduction connection part, such as a gas introduction connection part 8, in the upper case 3. Depending on the set pressure in the liquid chamber 5, the diaphragm 4 receives the pressure from the liquid introduction connection 7 and expands or contracts the gas pre-pressurized in the gas chamber 6, thereby absorbing or accumulating pressure. It is something.

The diaphragm 4 is attached to the attachment portion 9 between the lower case 2 and the upper case 3 by interposing an annular fixing ring 10 between it and the attachment end 4A of the diaphragm 4. . That is, first, attach the annular fixing ring 10 to the diaphragm 4, and in this state, attach the mounting step 2A of the lower case 2.
The outer peripheries of the lower case 2 and the upper case 3 are welded together while holding the annular fixing ring 10 by inserting the upper case 3 into the housing from above and then assembling the upper case 3 from above. Reference numeral 11 indicates a welded portion.

[0005] The sealing performance of the diaphragm 4 in such a conventional accumulator 1 was ensured by the elastic force of the rubber material or the like. However, there are problems in that the elastic force of the diaphragm 4 alone may not provide sufficient sealing performance, and the diaphragm 4 is susceptible to deterioration due to the effects of heat during welding. Furthermore, even if an attempt is made to apply adhesive to the mounting part 4A of the diaphragm 4 and then adhesively fix it to the mounting step part 2A of the lower case 2, the diaphragm 4 will be inserted from above, so the adhesive surface between them will be evenly and sufficiently coated. There is also the problem that there is no guarantee that it will be applied.

[0006]

SUMMARY OF THE INVENTION The present invention was conceived in view of the above-mentioned problems, and it is an object of the present invention to provide a diaphragm separating a first pressure chamber such as a liquid chamber from a second pressure chamber such as a gas chamber. It is an object of the present invention to provide an accumulator and a method for manufacturing the same that can improve sealing performance and improve manufacturing workability.

[0007]

[Means for solving the problem] That is, the first invention is as follows:
a lower case having a first pressure introduction connection;
An accumulator comprising: an upper case having a pressure introduction connection; and a diaphragm attached to a mounting portion between the upper case and the lower case to define first and second pressure chambers therein. , a fixing ring for fixing the mounting end of the diaphragm is disposed at the mounting portion between the lower case and the upper case, and a gap is formed between the mounting end of the diaphragm and the mounting step of the lower case. The accumulator is characterized in that an adhesive is interposed between the lower case and the upper case from the upper part thereof, and the outer peripheral parts of the lower case and the upper case are welded. A second invention provides a diaphragm attached to a mounting portion between a lower case having a first pressure introduction connection and an upper case having a second pressure introduction connection, and a diaphragm being installed inside the first and second pressure introduction connection. A method for manufacturing an accumulator forming a pressure chamber, the method comprising: attaching a fixing ring and a heat-meltable solid state adhesive to the attachment end of the diaphragm; A fitting step in which the upper case is fitted with the fixing ring and adhesive engaged with the mounting step of the lower case, and the outer peripheries of the upper case and the lower case are welded and the adhesive is melted. and a welding step of infiltrating the adhesive from above into the gap between the diaphragm and the lower case.

[0008]

[Function] In the accumulator and its manufacturing method according to the present invention, not only an adhesive is used, but also the heat during welding is used to melt the adhesive, and the adhesive is melted between the lower case and the mounting end of the diaphragm. By infiltrating the diaphragm from above, it fills the gap and allows them to be bonded together.This not only improves the sealing properties of the adhesive itself, but also prevents the diaphragm, especially the mounting end, from being affected by heat during welding. However, the sealing performance can be supplemented by the molten adhesive. Furthermore, the work of handling the adhesive itself is done while it is in a solid state, and unlike the case of applying a molten adhesive, workability and adhesion are good.

[0009]

[Embodiment] Next, an embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. 1 is a sectional view of a main part of an accumulator 20 according to the present invention, and the other configurations are the same as the accumulator 1 of FIG. 5, so similar parts are given the same reference numerals and will be described below.

An annular adhesive ring 2 as shown in FIG.
1 (solid state adhesive) is prepared. The annular adhesive ring 21 may be made of any material as long as it can be melted by heat. However, its properties include that it is solid at room temperature, melts above a certain temperature, has the function of an adhesive, and, once bonded, does not melt even if the temperature rises again. The cross-sectional shape is rectangular, triangular, circular, or C-shaped, and the mounting end 4A of the diaphragm 4 and the mounting step 2A of the lower case 2
Select arbitrarily depending on the shape of the attachment part between the

With the annular adhesive ring 21 combined with the diaphragm 4 and the annular fixing ring 10, this is inserted into the mounting step 2A of the lower case 2, and then the upper case 3 is inserted from above. By inserting, the fixing ring 10 is pressed down, and the outer peripheries of the lower case 2 and the upper case 3 are welded to form a welded portion 11.

During this welding, the adhesive ring 21 is melted by the heat conducted through the lower case 2, upper case 3, annular fixing ring 10, etc., and is further fluidized, so that the adhesive ring 21 is bonded to the mounting step 2A of the lower case 2 and the diaphragm 4. By penetrating the gap 22 between the mounting end 4A and the mounting end 4A from above, the two parts are bonded together.

[0013] Therefore, the adhesive effect of the adhesive ring 21 allows for more secure attachment and enhances sealing performance. Moreover, even if the mounting end 4A of the diaphragm 4 is affected by the heat during welding and deteriorates to some extent, the adhesive ring 21
Sealing performance can be guaranteed due to the adhesive effect.

In the present invention, as shown in FIG. 3, by making the first rib 23 and the second rib 24 protrude from the outer surface of the mounting end 4A of the diaphragm 4, the mounting end 4A of the diaphragm 4 is A gap or pocket 25 can be positively formed between the mounting step portion 2A of the lower case 2 and the mounting step portion 2A of the lower case 2. Alternatively, as shown in FIG. 4, the gap 27 can be actively formed by protruding the tapered rib 26.

[0015] Also, at this time, the first rib 23 and the second rib 23
By making the fitting gap on the liquid chamber side between the lower case 2 and the diaphragm 4 smaller than the fitting gap on the upper side by adding a step to the rib 24 or by making a tapered slope by the tapered rib 26, bonding can be achieved. It is possible to prevent the adhesive ring 21 from flowing out into the liquid chamber 5 when it is dissolved, and to increase the retention effect of the dissolved adhesive in the pocket 25 or the cavity 27.

[0016]

[Effects of the Invention] As described above, according to the present invention, it is possible to improve the sealing performance by utilizing the solid state and liquid state of the adhesive ring, and also to prevent deterioration of the diaphragm due to heat effects during welding. It is also possible to guarantee sealing performance. The efficiency of assembly and manufacturing operations can also be improved.

[0017]

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an accumulator 20 according to the present invention.

FIG. 2 is a perspective view of an annular adhesive ring 21 in the same embodiment.

FIG. 3 is a sectional view of main parts showing a state in the middle of combination of another example of the present invention.

FIG. 4 is a sectional view of main parts showing a combined state of still another example of the present invention.

FIG. 5 is a sectional view of a conventional accumulator 1.

[Explanation of symbols]

1 Accumulator 2 Lower case 2A Mounting step 3 Upper case 4 Diaphragm 4A Mounting end 5 Liquid chamber (first pressure chamber) 6 Gas chamber (second pressure chamber) 7 Liquid introduction connection (first pressure introduction connection part) 8
Gas introduction connection part (second pressure introduction connection part) 9
Attachment part 10 between lower case 2 and upper case 3 Annular fixing ring 11 Welding section 20 Accumulator 21 Annular adhesive ring 22 Gap section 23 between attachment step 2A and attachment end 4A 1 rib 24 2nd rib 25 Pocket (gap) 26 Tapered rib 27 Gap

Claims (2)

[Claims] 1. A lower case having a first pressure introduction connection part, an upper case having a second pressure introduction connection part, and an inner case that is attached to an attachment part between the upper case and the lower case. to the first and second
and a diaphragm defining a pressure chamber, a fixing ring for fixing the mounting end of the diaphragm is disposed at the mounting portion between the lower case and the upper case, and the diaphragm is mounted. An accumulator characterized in that an adhesive is interposed from above in a gap between an end portion and a mounting step portion of the lower case, and outer peripheral portions of the lower case and the upper case are welded. 2. A diaphragm is attached to a mounting portion between a lower case having a first pressure introduction connection part and an upper case having a second pressure introduction connection part, so that the first and second pressures can be internally installed. A method for manufacturing an accumulator forming a chamber, the ring and adhesive attaching step of attaching a fixing ring and a solid state adhesive meltable by heat to the attachment end of the diaphragm; a fitting step in which the upper case is fitted in a state in which a ring and an adhesive are engaged with the mounting steps of the lower case, and the outer peripheries of the upper case and the lower case are welded and the adhesive is melted. and a welding step of infiltrating the adhesive from above into the gap between the diaphragm and the lower case.