JPH11270791A - Breathing tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable and knocked-down breathing tank that is for temporary installation as a substitute for a standing breathing tank being under maintenance and inspection. SOLUTION: This breathing tank 15 comprises a knocked-down base frame 16 made up of a plurality of members, a balloon member 18 16 having a bellows-shaped barrel 17 placed on the base frame 16 and adapted to expand or contract in vertical directions, a plurality of guide posts 19 raised for free detachment along the outer edge of the base frame 16 to enclose the barrel 17 of the balloon member 18, and reinforcement members 20 fitted for free detachment about the barrel 17 of the balloon member 18 at a plurality of vertically spaced places to keep the planer shape of the barrel 17 as well as engaged for vertical movement with the guide posts 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable assembling type breathing tank which is used temporarily as a substitute during maintenance and inspection of a permanently installed breathing tank.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a low-temperature tank for storing a low-temperature liquefied gas such as LNG. A low-temperature tank 1 shown includes an inner tank 2 and an outer tank 3 surrounding the inner tank 2. It has a double shell structure, and the space between the inner tank 2 and the outer tank 3 is filled with a pearlite 4 as a heat insulating material so that heat insulation inside and outside the tank is achieved.

In such a low temperature tank 1 having a double shell structure, an inner tank 2 filled with perlite 4 and an outer tank 3
And a nitrogen gas is sealed between them to maintain an inert atmosphere, and the nitrogen gas sealing pressure is always maintained at about 10 mmAq so as not to cause a pressure fluctuation due to a change in outside temperature or atmospheric pressure.

That is, a breathing tank 7 having a casing 5 whose top is open to the atmosphere and a rubber diaphragm 6 which vertically separates the internal space of the casing 5 is provided near the low temperature tank 1. The lower space in the casing 5 which is pressurized by the weight of the weight 8 provided at the center of the diaphragm 6 communicates with the space between the inner tank 2 and the outer tank 3 of the low-temperature tank 1. The central portion of the diaphragm 6 is moved up and down in accordance with the volume of nitrogen gas which changes according to the outside air temperature and pressure, and supplies nitrogen gas to the low temperature tank 1 side. Is kept constant.

[0005] However, when the outside air temperature rises significantly and the air pressure drops, if the volume of the nitrogen gas is significantly increased and the diaphragm 6 of the breathing tank 7 rises to the upper limit position and cannot respond, the casing 5 The nitrogen gas in the lower space is released to the atmosphere from the relief valve 10 provided at an appropriate position to avoid an increase in pressure. In addition, when the outside air temperature is significantly reduced and the air pressure is increased, the volume of the nitrogen gas is reduced. If the diaphragm 6 of the breathing tank 7 drops to the lower limit position and cannot cope with it significantly,
A signal 12 is output from a level detector 11 which detects a vertical position at the center of the diaphragm 6, and the communication pipe 9
The solenoid valve 14 of the supply pipe 13 connected to the
2, and the new nitrogen gas is supplied.

[0006]

However, since the diaphragm 6 of the breathing tank 7 is made of rubber, there is a possibility that the diaphragm 6 may deteriorate due to long-term use. It is necessary to perform maintenance and inspection of the inside of the tank 7. During the maintenance and inspection period, the nitrogen gas filling pressure between the inner tank 2 and the outer tank 3 of the low-temperature tank 1 is controlled by the operator alternately day and night. Must be monitored, which is a heavy workload for the workers.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when performing maintenance and inspection of a permanent breathing tank, a portable assembling type breathing tank which can be temporarily used during the maintenance and inspection period and used as a substitute facility. The purpose is to reduce the work load of workers.

[0008]

According to the present invention, there is provided a balloon member having a base frame comprising a plurality of members, which can be disassembled and disassembled, and a bellows-shaped body which is mounted on the base frame and is vertically expandable and contractible. A plurality of guide pillars detachably mounted on an outer portion of the base frame so as to surround the periphery of the torso of the balloon member; and a plurality of vertically extending portions of the torso of the torso of the balloon member. A breathing tank, comprising: a reinforcing member which is detachably fitted to the outside so as to maintain a planar shape, and which is vertically movably engaged with the guide column.

Thus, when performing maintenance and inspection of the permanent breathing tank, a base frame is assembled and installed from a plurality of members near the low-temperature tank, and a balloon member is mounted on the base frame. A reinforcing member is externally fitted to a plurality of positions in the vertical direction of the body portion, and a plurality of guide columns are mounted upright on the outer portion of the base frame, and the reinforcing member is movable with respect to the guide columns in the vertical direction. In this case, a portable assembled breathing tank that can be used as a substitute during the maintenance and inspection period of the permanent breathing tank is temporarily provided.

[0010] Then, in performing the actual operation,
The balloon member of the temporary breathing tank and the space between the inner tank and the outer tank of the low-temperature tank are connected via a communication pipe or the like, and the volume of nitrogen gas sealed between the inner tank and the outer tank is reduced. The balloon member is vertically expanded and contracted to supply and discharge nitrogen gas to and from the low-temperature tank according to changes in temperature and air pressure, and the nitrogen gas filling pressure between the inner tank and the outer tank is maintained at a constant pressure. What is necessary is just to make it hold | maintain.

[0011] Here, reinforcing members are externally fitted to the balloon member at a plurality of positions in the vertical direction of the body, and
In addition, since the reinforcing member is vertically movably engaged with the guide column, the body of the balloon member may be depressed and deformed inward when deflated, or may buckle due to the influence of a cross wind. Is prevented beforehand, and a smooth and reliable expansion / contraction operation is maintained.

Further, in the present invention, the outer peripheral portion of the upper end of the balloon member is provided on a guide post so that the outer peripheral portion can be lifted via a wire, and the outer peripheral portion of the balloon member is lifted and lowered according to the unwinding length of the wire. It is preferable to provide an automatic hoisting machine that applies a tension to the wire to offset the weight of the balloon member and the reinforcing member added as the balloon member expands upward.

[0013] With this configuration, when the balloon member expands and contracts in the vertical direction, an appropriate tension is applied to the wire for lifting the outer peripheral portion of the upper end of the balloon member by the automatic winding machine, and the balloon member moves upward. The weights of the balloon member and the reinforcing member that are added as they are expanded are offset.

Further, in the present invention, it is preferable that the reinforcing member mounted on the uppermost stage of the body of the balloon member also serves as a weight.
A reinforcing net also serving as a weight may be detachably attached.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the present invention, in which the same reference numerals as in FIG. 5 denote the same parts.

As shown in FIG. 1, the breathing tank 15 in the present embodiment is temporarily installed during the maintenance and inspection period when the permanent breathing tank 7 is to be inspected and used as a substitute facility. A base frame 16 composed of members and disassembled;
A rubber balloon member 18 having a bellows-shaped body 17 mounted on and capable of expanding and contracting in the vertical direction, and an outer portion of the base frame 16 surrounding the body 17 of the balloon member 18. A plurality of guide pillars 19 which are detachably erected, and detachably externally fitted at a plurality of positions in the vertical direction of the body 17 of the balloon member 18 so as to maintain the planar shape of the body 17; A reinforcing member 20 engaged with the guide column 19 so as to be movable in the vertical direction.

The specific structure of each component of the breathing tank 15 will be described below in detail according to the actual assembling procedure.

As shown in FIG. 2, the base frame 16
Then, a radial frame 23 made of a shaped steel material is radially bolted to each apex portion of an octagonal center frame 22 reinforced with a wire netting 21 mounted on the upper surface in advance, and from the outer end of each radial frame 23 A plurality of arc-shaped divided pieces are bolted to the inside to form an annular outer peripheral frame 24 as a whole, and a plurality of pieces are provided on the upper surface between the radial frames 23 inside the outer peripheral frame 24. Receiving seat 2 over which wire mesh 25 is stretched and is continuous with wire mesh 21 on the upper surface of center frame 22.
6 are formed.

The base frame 16 having such a structure is used.
As shown in FIG. 3, on the upper surface of the receiving seat 26, a cylindrical balloon member 18 in which the bellows-shaped torso 17 is folded is folded.
Is mounted, and the outer peripheral portion of the lower end of the balloon member 18 is positioned and fixed by the outer peripheral frame 24 of the base frame 16.

Here, a reinforcing member 20 formed by assembling a plurality of arc-shaped divided pieces in an annular shape is externally attached to a large-diameter portion of the body portion 17 of the balloon member 18 formed by alternately sandwiching the small-diameter portion. Each of these reinforcing members 20
Is basically made of a lightweight material, but a relatively heavy material is used for the reinforcing member 20 mounted on the uppermost stage for the purpose of also using the weight.

A reinforcing net 27 also serving as a weight is preferably detachably mounted on the upper surface of the balloon member 18.

At an appropriate position on the lower surface of the balloon member 18, a supply / discharge port 28 for exchanging nitrogen gas with the low-temperature tank 1 is provided in a nozzle shape.
With respect to 8, a part of the wire mesh 25 of the receiving seat 26 in FIG. 2 is cut out in advance and extracted to the lower portion of the receiving seat 26 through an opening 29 formed in advance.

As shown in FIG. 4, a plurality of guide columns 19 surround the body 17 of the balloon member 18 placed on the base frame 16 as described above.
Each of the radial frames 2 is arranged so that the lower end of each of the guide columns 19 projects outward from the body 17.
3 is bolted to the outer end.

Further, a plurality of guide rollers 31 provided on an engaging member 30 are movably engaged with the respective guide columns 19 in the vertical direction.
One end is connected to the reinforcing member 20 of each step of the body 17.

In the present embodiment, an automatic hoisting machine 32 is provided in advance near the lower end of each of the guide columns 19, and a wire 33 unwound upward from the automatic hoisting machine 32 is used. The guide column 19 is folded downward through a sheave 34 at the upper end thereof and is attached to the outer periphery of the upper end of the balloon member 18.

Here, the automatic hoisting machine 32 can detect the vertical position of the upper end of the balloon member 18 based on the unwinding length of the wire 33 by a built-in rotary encoder or the like (not shown). As the balloon member 18 expands upward, the wire 33 can be given a tension that is added to the pressure applied to the nitrogen gas and that offsets the weight of the balloon member 18 and the reinforcing member 20.

It should be noted that the upper and lower positions of the upper end of the balloon member 18 are:
The balloon member 18 and the reinforcing member 2 at the elevation position
For the relationship with the weight addition of 0, data is collected in advance by performing preliminary tests and the like, and the torque for immediately applying the necessary tension to the wire 33 is automatically converted from the unwinding length of the wire 33 by automatic conversion. The logic for controlling the torque of the hoist 32 may be input to an electronic control unit (not shown).

When the permanent breathing tank 7 is maintained and inspected, the base frame 16 is assembled from a plurality of members in the vicinity of the low-temperature tank 1 and installed, and the balloon member 18 is placed on the base frame 16. Reinforcing members 20 are externally fitted to a plurality of positions in the vertical direction of the body portion 17 of the balloon member 18, and a plurality of guide columns 19 are mounted upright on the outside of the base frame 16. When the reinforcing member 20 is movably engaged in the up-down direction, a portable assembling type breathing tank 15 that can be used as a substitute during maintenance and inspection of the permanent breathing tank 7 is provided.
Is provisionally established.

Then, in performing the actual operation,
As shown in FIGS. 1 and 4, a temporary breathing tank 1 is provided.
5, the supply / discharge port 28 of the balloon member 18 and the communication pipe 9 connected to the space between the inner tank 2 and the outer tank 3 of the low-temperature tank 1 are connected via a temporary pipe 35, and the inner tank 2 is connected to the inner tank 2. Outer tub 3
The balloon member 18 is vertically expanded and contracted to supply and discharge nitrogen gas to and from the low-temperature tank 1 in accordance with the change in the volume of nitrogen gas enclosed between What is necessary is just to make it keep the sealing pressure of nitrogen gas between 2 and outer tank 3 at a fixed pressure.

Here, reinforcing members 20 are externally fitted to the balloon member 18 at a plurality of positions in the vertical direction of the body 17, and the reinforcing members 20 move vertically with respect to the guide columns 19. Since it is freely engaged, it is possible to prevent the body portion 17 of the balloon member 18 from inwardly deforming when deflated or buckling due to the influence of a cross wind, etc., and to perform a smooth and reliable expansion / contraction operation. Will be held.

In the present embodiment, when the balloon member 18 expands and contracts in the vertical direction, an appropriate tension is applied to the wire 33 for lifting the outer peripheral portion of the upper end of the balloon member 18 by the automatic hoisting machine 32. As a result, the weights of the balloon member 18 and the reinforcing member 20, which are added as the balloon member 18 expands upward, are offset.

At an appropriate position of the temporary pipe 35, when the outside air temperature rises significantly and the atmospheric pressure drops, the volume of the nitrogen gas significantly increases, and the balloon member 18 of the breathing tank 15 is moved to the upper limit position. It is preferable that a relief valve 36 is provided in anticipation of a case where the pressure rises to a level that makes it impossible to cope with the situation, and that a nitrogen gas is released from the relief valve 36 to the atmosphere so that a pressure rise can be avoided.
When the outside air temperature is greatly reduced and the atmospheric pressure is increased, the volume of nitrogen gas is significantly reduced and the breathing tank 15
Assuming that the balloon member 18 of the first embodiment is not able to cope with the lowering of the balloon member 18 to the lower limit position, another temporary pipe 37 is connected between the supply pipe 13 for supplying new nitrogen gas and the temporary pipe 35. The electromagnetic valve 38 provided in the temporary pipe 37 is set to a signal 39 for detecting the lower limit position from the automatic hoisting machine 32.
It is preferable that new nitrogen gas can be supplied by performing the opening operation.

After the maintenance and inspection of the permanent breathing tank 7 is completed, the above-mentioned temporary breathing tank 15 is dismantled and removed and reassembled at the next site, or stored in a predetermined storage place in a disassembled state. Just do it.

Therefore, according to the above embodiment, when the maintenance and inspection of the permanent breathing tank 7 is performed, the portable assembling type breathing tank 15 can be temporarily provided during the maintenance and inspection period and can be used as an alternative facility. This eliminates the need for the worker to alternately monitor the pressure between the inner tank 2 and the outer tank 3 of the low-temperature tank 1 day and night, thereby greatly reducing the work load on the worker.

In this embodiment, in particular, the weight of the balloon member 18 and the reinforcing member 20 is reduced by the lifting of the outer peripheral portion of the upper end of the balloon member 18 by the automatic hoisting machine 32 as the balloon member 18 expands upward. The addition of the pressure to the gas can be reliably avoided, and the nitrogen gas filling pressure between the inner tank 2 and the outer tank 3 can be more accurately maintained at a constant level.

Further, in the present embodiment, the reinforcing member 20 mounted on the uppermost stage of the body 17 of the balloon member 18 also serves as a weight, and the reinforcing net 27 also serving as a weight is attached to and detached from the upper surface of the balloon member 18. Since the balloon member 18 is freely mounted, the pressure load required for the balloon member 18 can be set in a well-balanced manner while reinforcing the balloon member 18.

It should be noted that the breathing tank of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0039]

According to the above-mentioned breathing tank of the present invention, the following various excellent effects can be obtained.

(I) According to the first aspect of the present invention, when performing maintenance and inspection on a permanent breathing tank,
During the maintenance and inspection period, a portable assembled breathing tank can be temporarily installed and used as an alternative facility.
It is not necessary for the worker to alternately monitor the pressure between the inner tank and the outer tank of the low-temperature tank day and night, so that the work load on the worker can be greatly reduced as compared with the conventional case.

(II) According to the invention of the second aspect of the present invention, as the balloon member expands upward by lifting the outer peripheral portion of the upper end of the balloon member by the automatic hoisting machine, the balloon member and the reinforcing member are raised. It is possible to reliably prevent the weight from being added as the pressure applied to the nitrogen gas, and it is possible to more accurately maintain a constant nitrogen gas filling pressure between the inner tank and the outer tank.

(III) According to the third and fourth aspects of the present invention, the load for pressurizing the balloon member can be set in a well-balanced manner while reinforcing the balloon member.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of an embodiment for implementing the present invention.

FIG. 2 is a perspective view showing details of a base frame of FIG. 1;

FIG. 3 is a perspective view showing a state where a balloon member is mounted on the base frame of FIG. 2;

FIG. 4 is a perspective view showing a state where guide columns are arranged around the balloon member of FIG. 3;

FIG. 5 is a schematic diagram showing an example of a low-temperature tank together with a permanent breathing tank.

[Explanation of symbols]

 15 Breathing tank 16 Base frame 17 Body 18 Balloon member 19 Guide pillar 20 Reinforcement member 27 Reinforcement net 32 Automatic hoisting machine 33 Wire

Claims (4)

[Claims] A balloon member having a bellows-shaped body mounted on the base frame and capable of expanding and contracting in a vertical direction; and a body of the balloon member. A plurality of guide columns detachably mounted on an outer portion of the base frame so as to surround the periphery thereof, and a plurality of guide columns which are detachably mounted so as to hold a plane shape of the body at a plurality of vertical positions of the body of the balloon member. A breathing tank, comprising: a reinforcing member which is freely fitted to the outside and movably engaged with the guide column in a vertical direction. 2. The balloon member is mounted on a guide post so that the outer peripheral portion of the upper end of the balloon member can be lifted via a wire, and the balloon member is raised upward in accordance with a vertical position of the upper end of the balloon member based on the unwinding length of the wire. 2. The breathing tank according to claim 1, further comprising an automatic hoist that applies a tension to the wire to offset the weight of the balloon member and the reinforcing member added as the wire is expanded. 3. 3. The breathing tank according to claim 1, wherein the reinforcing member mounted on the uppermost stage of the body of the balloon member also serves as a weight. 4. The breathing tank according to claim 1, wherein a reinforcing net serving also as a weight is detachably mounted on an upper surface of the balloon member.