JPS6220729Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure tank for an accumulator, and particularly to an improvement in the mounting structure between the tank and a rubber bladder housed therein.

[Conventional technology]

Conventionally, as shown in FIG. 5, a rubber bladder having a smaller volume and a similar shape than the tank is housed inside a cylindrical pressure tank that opens toward one end in the axial direction. A is made to face the opening a of the tank, and both opening ends a and a are fixed together, and the compression and expansion of the fluid sealed inside the bladder is used as an auxiliary power to store energy and maintain the pipeline. 2. Description of the Related Art Accumulators are known which are used for applications such as surge pressure absorption or pulsation damping of pump devices. In this type of accumulator, a tight mounting structure between the open ends a, a of the pressure tank and the rubber bladder, respectively, is an important requirement in order to satisfactorily perform the above-mentioned functions inherent to the device. However, in a conventional pressure tank, as shown in the figure, the flange part b of the opening end a of the rubber bladder is fitted to the flange part b of the opening a of the tank, and the pressure fluid passage V is axially centered. The opening ends a, a are tightly fixed by placing a lid plate on the tank and screwing bolts into a plurality of screw holes drilled in the periphery of the plate and in the flange part b of the tank. The flange part b of the bladder, which is made of a rubber elastic material with a relatively low hardness (Hs55 to 65), is closed by the cover plate when the bolt is screwed in. It is extremely difficult to equalize the tightening pressure applied to each bolt unless special tightening pressure measuring means is added. Moreover,
The peripheral edge of the flange part b of the bladder, which expands and deforms laterally due to the compression of the lid plate, is twisted, and this cut grows until it reaches the bladder body as the bladder expands and contracts during subsequent use. Sometimes even.

Therefore, in order to facilitate the installation of a rubber bag (bladder) in a pressure tank having the above structure, the open end of the rubber bag was fitted to the open end of the tank using the elasticity of the bag. Above, a bag mounting plate is applied to the inside of the open end of the rubber bag, while a lid is applied to the outside of the open end of the pressure tank, and the pressure tank and the rubber bag are attached by the mounting plate and the lid. The technology consists of sandwiching and fixing both open ends of the
For example, it has been proposed in Utility Model Application Publication No. 15802/1983.

[Problem that the invention attempts to solve]

However, in the case of the above-mentioned known structure, the bag mounting plate needs to have a diameter larger than the diameter at the open end of the rubber bag due to its function. Moreover, it is extremely difficult to insert these into the open end of the pressure tank, or to insert the mounting plate into the open end of a rubber bag that has been previously attached to the open end of the pressure tank.
Of course, it is possible to insert the mounting plate from the open end of the rubber bag with the mounting plate at an angle, but if the diameter of the mounting plate is made sufficiently large for good tightening and sealing effects, Insertion of the information is an even more time-consuming task.

Moreover, in this prior invention, the opening end of the pressure tank is formed in an oval shape, whereas the opening end of the rubber bag is formed in a circular shape, so when the two opening ends are combined, the opening of the rubber bag is The ends are transformed into ovals. It is well known that using such rubber molded products in a deformed state has an undesirable effect on the physical properties and sealing effect of the rubber material.

Therefore, the present invention improves the above-mentioned problems in known pressure tanks, makes it easier to attach a rubber bag to a pressure tank, and provides a method for attaching a pressure tank and a rubber bag that can achieve an even better sealing effect. The purpose is to provide structure.

[Means for solving problems]

The pressure tank for an accumulator according to the present invention is
In order to achieve the above object, a cylindrical pressure tank having a circular opening with a diameter smaller than the inner diameter of the main body at one end in the axial direction is provided with a pressure tank having a smaller volume than the tank.
And a pot-shaped rubber bladder having a circular opening similar to the opening of the tank is housed, and the open end of the bladder faces the open end of the pressure tank, and both open ends are fixed. , and a closed pressure tank having a pressure fluid passage penetrating along the axis, a spiral groove on the outer circumferential surface, and four tightening arms protruding from the outer circumferential surface at right angles to each other. It consists of a tightening bolt and a tightening nut that is screwed into the spiral groove of the tightening bolt, and each of the tightening arms has a right angle with the first vertex being the part that joins with one end of the tightening bolt. Each arm is formed in a triangular shape, and the length measured from the axis of the tightening bolt to the second vertex of each arm metal member is larger than the opening radius of the rubber bladder, and each of the adjacent arms a tightening fixture in which a distance measured between second vertices of the metal material is smaller than the opening diameter of the rubber bladder; and an auxiliary ring that abuts on the inside of the opening end of the rubber bladder. Accordingly, the open end of the rubber bladder is fastened and fixed to the open end of the pressure tank.

According to a preferred embodiment of the present invention, the slope of each cross arm of the tightening bolt is formed into a concave curved shape.

[Effect]

In the pressure tank of the present invention having the above configuration, each arm of the tightening bolt used to tighten and secure the open end of the rubber bladder to the open end of the pressure tank is joined to one end of the tightening bolt. The rubber bladder is formed into a right triangle shape with its first vertex as its first apex, and the distance measured between the second apexes of each adjacent cross arm member is smaller than the opening diameter of the rubber bladder. If the tightening bolt is moved so that the second apex of the two matching arm metal members is located on the diameter of the opening of the rubber bladder, and is tilted obliquely to the axis of the bladder, The armrest can be easily inserted into the opening of the bladder.

Next, the tightening bolt is moved to the center of the opening of the rubber bladder, and the tightening nut is screwed into the spiral groove of the bolt and tightened, thereby aligning the axis of the tightening bolt. Since the length measured from to the second vertex of each cross arm is larger than the opening radius of the rubber bladder, the bolts are arranged radially at equal intervals on the outer circumferential surface of the tightening bolt. With the plurality of arm metal members and auxiliary rings, the open end of the rubber bladder is fixed to the open end of the pressure tank with uniform tightening force over the entire circumference.

Furthermore, according to the present invention, the open ends of the pressure tank and the rubber bladder are both similar circular shapes, so that when assembled with the pressure tank, the rubber bladder can There is no drawback that the opening end of the rubber band is elongated or distorted, resulting in partially uneven wall thickness, resulting in uneven sealing effect and early deterioration of the rubber properties.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 is a longitudinal sectional view of a pressure tank for an accumulator according to an embodiment of the present invention. In this example, the pressure tank 1 is a metal container having a circular opening end 1c and having a cylindrical pot shape as a whole, and has an upper half 1a and a lower half 1b formed separately as usual. , both parts 1a and 1b are welded together to form an integrated container. This pressure tank 1 has a stepped portion 1d formed in an inverted L shape and protrudes outward along the axis Y-Y at its open end portion 1c, and a rubber bladder, which will be described later, is attached to the stepped portion 1d. The open end 2a of No. 2 is fitted.

The rubber bladder 2 is made of natural rubber or synthetic rubber such as polyisoprene rubber, polybutadiene rubber, styrene-butadiene rubber, butyl rubber, and is formed as a similar pot-shaped bag with a smaller volume than the pressure tank 1, and also, The opening 2a is a thick annular rib having approximately the same diameter as the opening end 1c of the pressure tank 1, and having a rectangular cross section sufficient to fill the internal space of the stepped portion 1d of the tank 1, which has an inverted L-shaped cross section. It is formed in the shape of , and is fitted into the step part 1f of the pressure tank 1 as described above.

The open end 2a of the bladder 2 is connected to the pressure tank 1.
Referring also to FIG. 2, the tightening fixture 3 for tightly tightening and fixing the opening end 1c of the A tightening bolt 4 having a spiral groove 6 carved in the surface, and four tightening arms 8, 8... projecting radially from the surface at equal intervals and having a substantially triangular shape; A tightening nut 5 is screwed into a helical groove 6 of the bolt 4.

The tightening arms 8, 8, . . . of the tightening bolt 4 are the first
As shown in the figure, it must be inserted into the interior of a rubber bladder 2 through the open end 2a of the rubber bladder 2, which is previously fitted into the open end 1c of the rigid pressure tank 1. Therefore, as shown in FIG. 3, the length l between the first arm metal member 8 and the second arm metal member 8' provided at a symmetrical position is the length l of the opening end portion 2a of the bladder 2. Although it is longer than the aperture L, the distance l' between each vertex of the first arm metal member 8 and the adjacent arm metal member 8'' is equal to the aperture L of the open end 2a of the bladder 2.
It has been made shorter. In addition, each arm metal material 8 has a fourth
As shown in the figure, the inclined surface can also be formed into a concave shape.

In order to apply the tightening force by the arms 8, 8, . is abutted on the inside of the The ring 9
can be made of any hard material such as metal or plastic.

The assembly operation of the pressure tank of this example is performed as follows.

The auxiliary ring 9 is loaded inside in advance, and the upper half 1a
A rubber bladder 2 is inserted from the open end 1c into the completed pressure tank 1 by welding the lower half 1b and the lower half 1b.
After being crushed and inserted, the auxiliary ring 9 is fitted into the open end 2a of the bladder 2 within the tank 1, and the open end 2a is further fitted into the step 1d of the open end 1c of the pressure tank 1. It's crowded.

Next, the tightening arms 8, 8, . . . of the tightening bolt 4 are tightened.
For example, the first arm metal member 8 and the second arm metal member 8'
Move the tightening bolt 4 so that each vertex of is located on the diameter of the open end 2a of the rubber bladder 2,
After inserting the bolt 4 into the bladder 2 by tilting the bolt 4 with respect to the axis Y-Y,
Move the tightening bolt 4 to the center of the opening end 2a, and then attach the auxiliary ring 9 to the horizontal part of each arm metal member 8.
guess. On the other hand, the cover plate 10 is loosely fitted onto the tightening bolt 4, and the tightening nut 5 is screwed into the spiral groove 6 of the bolt 4 to tighten it.

In this way, the tightening force by the tightening arms 8, 8, .
is tightly fixed to the open end 1c of the pressure tank 1, while the cover plate 10 seals the open end 1c of the pressure tank 1.

In the figure, reference numeral 11 denotes a packing, and a similar packing can also be fitted between the open end 1c of the pressure tank 1 and the lid plate 10.

[Effect of idea]

As described above with examples, the present invention has the following features:
It is possible to provide a mounting structure for a pressure tank and a rubber bladder that can further facilitate the operation of mounting a rubber bladder to a pressure tank and provide an excellent sealing effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a pressure tank according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of a tightening fixture used in the tank of FIG. 1, and FIG. FIG. 4 is a plan view of the tightening fixture, FIG. 4 is a side view of a tightening fixture according to another embodiment, and FIG. 5 is a longitudinal sectional view of a conventional pressure tank. The meanings of the numbers in each figure are as follows: 1...pressure tank, 1a...upper half of 1, 1b
...lower half of 1, 1c...open end of 1, 1d...
...Stepped part of 1c, 2...Rubber bladder, 2a...
2 open end, 3... tightening fixture, 4... tightening bolt, 5... tightening nut, 6... spiral groove, 7...
Pressure fluid passage, 8... tightening arm metal, 9... auxiliary ring, 10... lid plate, 11... packing.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Inside a cylindrical pressure tank having a circular opening with a diameter smaller than the inner diameter of the main body at one end in the axial direction, a pressure tank having a smaller volume than the tank and with the opening of the tank. A pressure tank that accommodates a pot-shaped rubber bladder having a similar circular opening, and that the open end of the bladder faces the open end of the pressure tank, and both open ends are fixed and closed. A tightening bolt having a pressure fluid passage passing through the tank along an axis, a spiral groove on an outer circumferential surface, and four tightening arm members protruding perpendicularly to each other from the outer circumferential surface, and the tightening bolt. a tightening nut that is screwed into the helical groove of the bolt, and each of the tightening arms is formed into a right triangular shape with a first apex at the portion that joins with one end of the tightening bolt. , the length measured from the axis of the tightening bolt to the second vertex of each arm metal member is larger than the diameter of the open end of the rubber bladder, and The rubber A pressure tank for an accumulator, characterized in that an open end of a manufactured bladder is fastened and fixed to an open end of a pressure tank. (2) The pressure tank for an accumulator according to claim 1 of the utility model registration claim, wherein the slope of each arm metal member is formed into a concave curved surface.