JPS59134182A - Rubber bag for feed tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for installing the
This invention relates to the structure of a rubber bag installed inside a water supply tank that stores other liquids.

Traditionally, water tanks have been installed on the rooftops of buildings to supply water to households, but since the water tanks constructed in this way were open, they were susceptible to dust and dirt, making them unhygienic. Ta.

For this purpose, as shown in FIGS. 1 and 2, a sealed water tank 1 is used, in which a rubber bag container (bladder) 2 is suspended via a hanging fitting. It's becoming like this.

Moreover, when we look at the operating state of this tank 1, we can explain it using FIG. The pipes connected to each household and the pump are connected, and the pump is operated to lift water 6 into the water supply tank 1, and the water 6 is stored in the rubber bag 2 as shown in FIG. When the use of water starts, the water supply pressure (for example, 0.5 to 20 Kg/ait) applied in advance between the inner surface of the water tank 1 and the outer surface of the rubber bag 2 works naturally.
Water supply from rubber bag 2 starts naturally. J: Sea urchin composition. If you use the sealed water tank 1 using a rubber bag 2 in this way, the water will be stored in the rubber bag 2 and not only will it not come in contact with the air, but since no sunlight will pass through it, no organic matter will be generated. The water in the water tank 1 can always remain fresh and is extremely raw.

However, if the water stored in the water tank 1 decreases due to use, the rubber bag 2 used in the water tank 1 configured as described above is used by the pump mechanism for sending water to the rubber bag 2. This structure of the rubber bag 2 poses a problem because the rubber bag 2 undergoes repeated movements of inflating and contracting as it is forced into the tank 1 as it is used.

In other words, looking at the structure of the conventional rubber bag 2, several rubber sheets are lap-connected to form two elliptical rubber sheets 7.8, and the sheets 7.8 are overlapped. By gluing and integrating the outer circumferential surfaces thereof, a bag 2 having an outer circumference folded portion 9 is formed.
Moreover, if you take out part a of the outer circumferential folded part 9 and look at the state where it is glued and integrated in an enlarged manner as shown in FIG. The peripheral edges of the sheets 1 to 8 on the one side are simply folded to cover the outer peripheral edge of the other rubber sheet 7, and the edge of the sheet 8 that is folded back is glued to the outer peripheral surface of the sheet 7. It has an integrated structure. Moreover, in this case sheet 8
Looking at the process of folding back and gluing the ends to the outer circumferential surface of sheet 7, it turns out that before vulcanization, the ends were simply folded back and glued to the outer circumferential surface of sheets 1 and 7 with rubber glue. Wrinkles tend to form on the inside, and if they do, the wrinkles will remain as they are even after vulcanization, so there is a problem that cracks will occur on the inside of the fold due to expansion and contraction during actual use. be.

The present invention provides a rubber bag for a water tank, which eliminates the drawbacks of the prior art described above and can significantly improve the dynamic fatigue resistance of the rubber bag. In other words, the gist of the present invention is to provide a rubber bag with an outer folded portion formed by joining and connecting rubber sheets made of natural rubber or synthetic rubber, which form at least the upper and lower surfaces. The part consists of a rubber sheet whose circumferential edge on one side of the upper and lower backs is bent and folded back so as to cover the other rubber sheet's circumferential edge, and the bent inner surface has a thickness of rubber sheet 1 to 0. Curve f51 consisting of a bending radius of 6 to 4 times
A rubber bag for a water tank is made of a rubber bag for a water tank, which is made of a 474-piece structure having a 474-piece structure, and its folded end is integrally bonded to the outer surface of the other rubber sheet.

In this invention, the thickness of the rubber sheet is about 0.6 to 4
The reason why the curved section is made with a bending radius of 18 is because the thickness of the upper (or lower) rubber seal is 0.6XtJ. If the concentration of strain is large and the fatigue life characteristics are insufficient and the 4.0XtJ: This is because if the material is coated, wrinkles will occur, which will impede workability.

In addition, in this invention, as the material of the rubber bag, either natural rubber J5 or synthetic rubber can be used, but there is generally a gas internal pressure between the outer circumference of the rubber bag and the inner circumferential surface of the water tank It is particularly desirable to use butyl rubber (IIR) because it is required to have resistance to gas permeation since it is multiplied by [ ).

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.The overall structure of the rubber bag will be omitted since it is similar to the structure shown in FIG.
This point is shown enlarged in the figure.

In other words, in FIG. 5, the outer circumferential folded portion 11 of the rubber bag 10 has the circumferential edge of the lower rubber sheet 13 and the upper rubber sheet 12.
The bent inner surface of the rubber sheet 13 formed when the rubber sheet 13 is folded back outward so as to cover the peripheral edge is at least the rubber sheet 13 (the thickness is the same, so the rubber sheet 12 The present invention is characterized by having a curved portion (arc portion) 14 having a bending radius R of 0.6 to 4 times the thickness.

In this case, since the curved part 14 is formed, this will be explained with reference to the rubber bag 2 in FIG. Needless to say, the structure is similar to that formed in the folded portion 9. Reference numeral 15 denotes an adhesive portion where the end portion of the folded rubber sheet 13 and the outer periphery of the end portion of the rubber sheet 12 are bonded together in the same way as in FIG.

The rubber bag 10 having such a structure will be explained with reference to FIG. 3, but first, five unvulcanized rubber sheets cut into appropriate widths are cut into one side and two sets are cut into two sets. Have them prepared. In this case, an outer circumferential folded portion 11 of the rubber sheet as shown in FIG. 5 is formed.

Needless to say, one set of rubber sheets is formed in a manner similar to that of the other set because of necessity.

Next, when the bag formation is completed, the two sets of rubber sheets are placed facing each other in order to form the ring shape that is formed when the rubber bag 2 shown in FIG. 3 is cut into rings along each wrap section 16. Rubber sheets facing each other are vulcanized and integrated to form a ring shape.
Ru. In this case, the case where each ring shape is vulcanized and integrated will be explained using FIG. 3. For example, for the ring shapes A and E, in order to form the outer circumferential folded part 11 having the ring-shaped gap 17 shown in FIG. A curved part (arc part) 1 from a bending radius R of 0.6 to 4 times the thickness t of the rubber sheet 13 (or 12)
4 on the inner surface of the rubber sheet 13 is arranged on the arc-shaped end surface of the rubber sheet 13, and then the arc-shaped end of the lower rubber sheet 13 is connected to the arc-shaped mandrel and the upper outer periphery. Covering the arc-shaped rubber sheet 12,
Moreover, the rubber sheet 12 is folded back along the outer periphery of the outer end, and is adhered to the rubber sheets 12J3 and 12 using rubber glue made of the same material as 13, and then vulcanized, and the mandrel is removed. A ring is formed.

Since the inner surface of the unvulcanized rubber sheet 13 is limited by the mandrel, the occurrence of wrinkles can be suppressed.

In addition, in other ring shapes B, CJ'iJ: and D, except for those in which only the mandrel is made of slate,
The manufacturing method is the same. After that, each ring shape A, B, C, D, and E are connected and integrated, as shown in Fig. 5. For the sheet (or tape) and rubber glue, and for other connection parts, unvulcanized rubber seams 1 to 3 are used to connect the sheets (or tapes) and rubber glue, and after vulcanization, the mandrels at each outer circumferential fold part 11 are connected. By removing the rubber bag 10, the production of the rubber bag 10 in which a suitable ring-shaped gap 17 is formed in the outer circumference folded portion 11 as shown in FIG. 5 is completed.

In this case, the size of the completed rubber bag 10 is approximately 2.61 rL in length and approximately 4.1 m in width, and there is approximately 5700J inside! In order to make a slightly larger rubber bag that could store a certain amount of water, and since the width of a rubber sheet is generally limited to a predetermined width, we adopted the method of manufacturing the rubber bag shown above. However, if a small rubber bag is to be manufactured and covered, it may be manufactured using two rubber sheets, and if a rubber bag larger than the rubber bag 2 shown in Fig. 3 is to be manufactured, a ring shape is first formed. There are no particular restrictions on the manufacturing of rubber bags, as the manufacturing process is not limited to manufacturing by connecting the bag after the rubber bag is manufactured. ~0.6 of thickness t of 12 or 13
~4 times the radius 1 (such that the curved section 14 is formed by
The ring-shaped gap 17 formed by holding the bendable rubber sheet 13 on the inner surface is the outer circumference folded portion 11 of the rubber bag.
If the rubber bag of the present invention is formed by any manufacturing method, it will not be supported.

Next, in order to examine the lifespan due to repeated elongation, we prepared samples with various radii (as shown in Fig. 5) and shapes suitable for elongation life tests. The test conditions were as per the J15K6301 bending test.
Moreover, specifically, using a dematcher type tester, the temperature 2
0℃, repeated elongation rate 0~40%, number of reciprocations 300 times/
When a test was carried out as a minute, the following results were obtained.

In other words, Examples 1 to 15, in which the bending radius R was 0.6 to 4 times the thickness of the rubber sheet, had a life approximately 30 times longer than Comparative Examples 1 to 2, and good results were obtained. . Incidentally, Comparative Example 1 is a case where the bending radius is 0.5 times the thickness of the rubber sheet,
Comparative Example 2 is a case where the sample shown in FIG. 4 was used.

In addition, the bending radius (i
R) 2.0 mm (the multiple is close to the lower limit) is Example 16, and the rubber sheet thickness is 3.0#III+ and the bending radius (R) is 100 mm (the multiple is close to the upper limit -b) is Example 17, and the test conditions are the same as in Examples 1 to 15 and Comparative Examples 1 to 2, but in this case, the repeated elongation rate was 0 to 20%,
0~. Tests were conducted under conditions divided into three stages: 40% and 0-60%, and at this time, Comparative Examples 1-
The test was conducted on the same I15''i under the dimensional conditions mentioned in 2.The ILi!I Song is shown in Figure 6. 2
When the elongation rate is 0 to 60%, the lifespan of Examples 16 and 17 is around 103 times, but when the elongation rate is 0 to 60%, -( also maintains the breaking life of 3 x 104 times, which is the standard value C). It can be seen that

As described above, according to the present invention, in order to form the outer circumference 1h of the rubber bag, the bent inner surface of the rubber sheet is formed into a curved portion having a bending radius of 0.6 to 4 times the thickness of the rubber sheet. This eliminates wrinkles caused by bending when unvulcanized, and therefore no wrinkles remain on the bent inner surface even after vulcanization.Furthermore, the bending radius is set within a specific range compared to conventional products. , the repeated extension life is greatly improved, so its industrial value is extremely high.

[Brief explanation of the drawing]

Figure 1 shows the front view of a general water tank, Figure 2 shows the 1st
3 is a front view of a general rubber bag, FIG. 4 is an enlarged sectional view of the main part of FIG. 3, and FIG. 5 is an embodiment of the present invention. FIG. 6 is a corresponding diagram showing test results of other embodiments of the present invention and comparative examples. 1: Water tank, 2, 10: Rubber bag, 3: Hanging fittings, 4
: Supply/discharge port, 5: Entrance/exit, 6: Water, 7.8=Oval rubber sheet, 9.11: Outer circumferential fold, 12° 13: Rubber sheet, 14: Curved part, 15: Adhesive part, 16: Wrap section, 17
: Ring-shaped gap.

Claims (1)

[Claims] A rubber bag having an outer folded part formed by aligning and connecting at least upper and lower rubber sheets made of natural rubber or synthetic rubber. It consists of a structure in which the end part is bent and folded back so as to cover the peripheral end part of the other rubber sheet, and the bent inner surface has a curved part with a bending radius of 0.6 to 4 times the thickness of the rubber sheet. 1. A rubber bag for a water tank, characterized in that the bag is formed so as to be held in place, and its folded end is integrally bonded to the outer surface of the other rubber bag.