JPH0532692Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (industrial application field) The invention is a locking device for a lid in a pressure vessel such as an accumulator. Specifically, the present invention relates to a device that uses one split ring to restrict the tightening of the lid retaining ring and to prevent the lid from being blown away due to internal pressure.

(Prior Art) Conventionally, as a device for locking a lid holding screw ring in a pressure vessel such as an accumulator using a split ring, a lid body that is fitted into an opening in the pressure vessel to close the opening is used as a device for locking a lid holding screw ring in a pressure vessel such as an accumulator. An annular groove is formed in the upper part of the spiral ring which is formed on the periphery and is screwed into the internal thread to hold it down, and a split ring with a circular cross section is fitted into this annular groove, and the outer lower part of this split ring is placed inside the upper end of the opening. The structure in which the split ring is pressed into the annular groove by engaging with the formed slope is disclosed in Utility Model Publication No. 55-124658.
In this device, when the screw ring is tightened, the split ring comes into contact with the opening edge of the pressure vessel and restricts the tightening of the screw ring, making it possible to eliminate the need for a flange on the screw ring. It is.

(Problem to be solved by the invention) However, in the above-mentioned device, an annular groove is provided on the outer periphery of the lid holding screw ring, a split ring is attached to this, and the outer periphery protruding outside the groove is used as the opening of the pressure vessel. Since the split ring is engaged with the upper edge, it is possible to restrict the tightening of the lid retainer ring, but when the lid retainer ring is removed, the split ring is also removed, so the split ring is used to prevent the lid of the container from being tightened. It is impossible to prevent the body from being blown away by internal pressure.

The present invention provides a device that uses a single split ring to regulate the tightening of the lid retaining ring and prevent the lid from blowing off due to internal pressure by changing the mounting position of the split ring to the inside of the opening of the pressure vessel. It is intended to.

(2) Structure of the device (means for solving the problem) The lid locking device for a pressure vessel of the present device solves the problem by forming an annular groove in the middle of the opening, inserting a rigid split ring into the annular groove with its inner periphery protruding from the groove, and locking the lower edge of the lid locking ring descending into the protruding portion and the upper edge of the lid rising, in a pressure vessel where the lid is fitted into an opening in the pressure vessel so that the flange of the bladder contained in the pressure vessel is sandwiched between the retaining step of the lid and the receiving step of the opening, and the male threads of a lid locking ring are screwed into a female thread provided on the inner circumference of the opening to hold down the lid.

(Function) In the device of the present invention configured as described above, the bladder is inserted into the pressure vessel through the opening, its flange is supported by the receiving part, and then the lid body is fitted into the opening and the bladder is held in place. After the flange is sandwiched between the step part and the receiving step part of the opening, a rigid split ring is fitted with a reduced diameter into an annular groove provided in the middle part of the opening, and the inner peripheral side thereof protrudes from the annular groove. When the male thread of the lid retainer ring is screwed into the female thread of the opening and tightened, the lid retainer ring retains the lid body and the retainer step and the receiving step of the opening When the bladder flange is compressed and a sufficient airtightness is achieved, the lower edge of the lid retaining ring hits the inner circumferential side protruding from the annular groove of the split ring, restricting tightening. The flange will not be damaged by over-tightening the ring.

Also, when disassembling a pressure vessel for inspection or repair, if you forget to drain the pressure fluid inside the pressure vessel and remove the lid retaining ring, the pressure fluid inside the pressure vessel will push up the lid, but the upper part of the lid will There is a split ring that protrudes from the annular groove on the inner circumferential side, and because it touches and locks the upper edge of the lid, the lid will not be blown away by the pressure of the fluid.

(Example) Next, an example of an apparatus related to the present invention will be described based on the drawings.

1 and 2 of the drawings, reference numeral 1 denotes a pressure vessel of, for example, an accumulator, which is made of steel or the like in a shape with a high pressure resistance, and has an opening 2 in its upper part for accommodating a bladder, which will be described later. A receiving step portion 3 for supporting a flange of a bladder, which will be described later, is formed on the end side.

Reference numeral 4 denotes a bladder, which is deformably formed of an elastic material such as rubber, and is inserted into the pressure vessel 1 described above, and the lower surface of the flange 5, which also serves as a sealing member, is connected to the receiving part of the opening 2. 3, and its upper surface is held down by a holding step of a lid body, which will be described later, and is airtightly attached to the pressure vessel 1, thereby dividing the inside of the pressure vessel 1 into two chambers.

Reference numeral 6 denotes a lid body that fits into the opening 2 of the pressure vessel 1 described above, and a restraining step portion 7 for suppressing the flange 5 of the bladder 4 described above is provided around the lower outside of the lid body, and this restraining step portion 7 and the aforementioned opening 2 The bladder 4 is
can hold the flange 5 of the
A seal ring 9 is fitted into the annular groove 8, and a cylindrical portion 11 is provided in the center to which an air supply valve 10 for sealing pressurized gas into the bladder 4 is attached.

Reference numeral 12 denotes a lid holding ring for holding down the lid 6, which has a male thread provided on its circumferential surface screwed into a female thread 13 provided on the inner periphery of the opening 2, and abuts on a split ring to be described later on the outside of the lower end. A locking step 14 is formed.

Reference numeral 15 denotes an annular groove formed in the middle part of the opening 2, in which a split ring to be described later is engaged, and a hole 16 made in the pressure vessel 1 is communicated with the appropriate position of the annular groove 14, so that the pressure vessel The pressure fluid in the chamber 1 is discharged to the outside.

17 is a rigid split ring to be fitted into the annular groove 15, which is formed into the shape shown in FIG.
When the outer diameter is formed to be larger than the annular groove 15 and the outer diameter is reduced and fitted into the annular groove 14, it will stick tightly to the annular groove 14 due to the spring effect, and its inner circumferential side will protrude from the annular groove 14. The lower edge of the lid restraining ring 12 that is descending and the upper edge of the lid body 6 that is ascending are locked by this protrusion.

C. Effects of the invention As mentioned above, the device according to the invention attaches a split ring whose inner circumferential side protrudes from the groove into an annular groove provided at the opening of a pressure vessel. Since the lower edge and the upper edge of the rising lid are locked, one split ring can be used to regulate the tightening of the lid retainer ring and to prevent the lid retainer ring from being tightened without draining the pressure fluid. This has a special effect in that it can fulfill both the functions of preventing the lid from blowing off.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional front view showing an embodiment of the device according to the present invention. Fig. 2 is a partial longitudinal sectional front view with the lid retaining ring removed. FIG. 3 is a perspective view of the split ring used in the above. 1... Pressure vessel, 2... Opening, 4... Bladder,
5...Flange, 6...Lid body, 12...Lid holding ring, 15...Annular groove, 17...Split ring.

Claims (1)

[Scope of utility model registration request] The lid is fitted into the opening of the pressure vessel, and the flange of the bladder accommodated in the pressure vessel is sandwiched between the holding step of the lid and the receiving step of the opening, and the inner periphery of the opening is In a pressure vessel in which the lid is held down by screwing the male thread of the lid holding ring onto the female thread provided in the pressure vessel, an annular groove is formed in the middle part of the opening, and an inner circumferential side of the pressure vessel protrudes from the groove. A lid locking device for a pressure vessel, characterized in that a rigid split ring is inserted to lock the lower edge of the lid restraining ring that descends into the protrusion and the upper edge of the lid that rises.