JPH0717920Y2 - Double-shell tank pump barrel support device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a pumping device for a double-shell tank that stores low-temperature liquefied gas such as LPG, LNG, and ethylene, that is, a supporting device that supports a pump barrel. Is.

(Prior Art) A conventional double-shell tank pump barrel is fixed to the inner tank roof and the entire load is supported by the inner tank roof. In order to disperse and mitigate the load received on the inner tank roof, a fixed base is provided on the bottom plate, and an expansion joint or the like is provided in the middle of the barrel to absorb vertical fluctuations. Has been done.

That is, the invention of Japanese Patent Publication No. 59-47198 exists as a pump barrel supporting device for a double shell low temperature tank in which a supporting device having an expansion tube connected to a barrel is provided on a floor plate.

In addition, there is a device of Japanese Utility Model Publication No. 58-14592 as a liquid dispensing nozzle for a low temperature tank in which a support is provided on the bottom plate and a bellows is provided in the upper part of the pump barrel.

In addition, there is a device of No. 61-89599 as a pump barrel supporting structure for a low temperature double shell tank in which a base is installed on the bottom plate and an expansion joint is installed on the inner tank roof.

Further, as a nozzle supporting device for a low temperature tank, which is supported by the roof of the outer tank, a bellows is provided on the roof of the inner tank, and a support base is provided on the bottom plate, there is a device disclosed in Japanese Patent Laid-Open No. 58-17296.

(Problems to be Solved by the Invention) In each of the invention and the invention of the conventional example, the pump barrel is supported by the support mount device provided on the bottom plate, but the connection is a rigid connection structure, and the mount device itself has Had no mechanism to absorb and mitigate the vertical movement and thermal displacement of the barrel.

Therefore, in order to absorb and mitigate vertical fluctuation and thermal displacement, expansion joints and bellows have been provided on the cylindrical tube body of the pump barrel or the roof of the inner tank.

Therefore, high gas pressure is applied to the parts where expansion joints and bellows are installed, and expansion and contraction is repeated due to vertical fluctuations.Expansion joints and bellows with thin wall thickness and weak strength are repeatedly fatigued and deteriorated, resulting in airtightness. However, problems such as pressure resistance and leakage may occur.

Further, when an expansion joint and a bellows are provided inside the tank, there is a problem that inspection and maintenance of this portion cannot be performed when the tank is used.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to eliminate a displacement absorption provided on a support base without directly supporting the pump barrel on the support base on the bottom plate. A dual structure that supports through a mechanism and disperses and supports the entire load applied to the pump barrel on both the support frame having this displacement absorption mechanism and the inner tank roof, and absorbs and alleviates vertical fluctuation and thermal displacement of the pump barrel. It is to provide a pump barrel support device for a shell tank.

(Means for Solving the Problem) A pump barrel supporting device for a double-shell tank according to the present invention supports a pump barrel erected in a tank by suspending and fixing the pump barrel to an inner tank roof, and at the bottom of the pump barrel. Is supported by a displacement absorbing mechanism provided on a support frame on the bottom plate.

The displacement absorbing mechanism is formed by providing a compression spring, a tension coil spring, or a gravity balance.

(Operation) The support device for the pump barrel of the double shell tank according to the present invention is such that the total load of the pump barrel, the pump, and the liquid in the barrel is
It is dispersed and supported by a pedestal supported by a displacement absorbing mechanism on the bottom plate and an inner tank roof.

The vertical movement and thermal displacement acting on the pump barrel are absorbed and relaxed by the displacement absorbing mechanism provided on the support frame, and are supported elastically or by weight balance.

Since the pump barrel does not have expansion joints or bellows in the middle, pressure resistance and airtight structure are maintained.

(Embodiment) An embodiment of a support device for a pump barrel of a double shell tank according to the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional explanatory view in which a part of the double shell tank is cut away, and shows an embodiment in which a support frame having a displacement absorbing mechanism using a disc spring as an example of a compression spring is provided in the lower portion of a pump barrel. .

The double-shell tank is composed of an inner tank tank which is provided with an inner tank side plate 1 and an inner tank roof 2 to store a liquid, and an outer tank tank which is provided with an outer tank side plate 3 and an outer tank roof 4 to thermally retain the inner tank. Formed in a double shell. The pump barrel 5 is provided with a foot valve 6 that sucks liquid and a head plate 7 that seals the upper end at the lower end of a straight cylindrical pipe, and has a discharge port 8 that discharges the liquid at the upper part. Further, a submerged pump 9 to which a lead wire 10 for power transmission is connected is installed in the lower inside of the pump barrel 5.

The pump barrel 5 has a top part which is hung and fixedly supported by an inner tank support part 11, and a bottom part which is provided on a support stand 13 mounted on a bottom plate 12 of the inner tank, and a displacement absorbing mechanism by a disc spring 14 which is a kind of a compression spring. To support. To support the disc springs 14, a plurality of support tools 15 are attached to the outer periphery of the lower portion of the pump barrel 5.
A plurality of stages of disc springs 14 are provided between the frame and the base 13. Therefore, the vertical movement and thermal displacement of the pump barrel 5 are absorbed and mitigated by the disc spring 14 and are elastically supported. In addition, the middle part of the pump barrel 5 is
A steady rest is guided by a plurality of spaced apart supports 16 extending horizontally from the inner tank side plate 1.

FIG. 2 is a partial cross-sectional explanatory view in which a support frame having a displacement absorbing mechanism using a spring which is an example of a tension coil spring is provided in the lower portion of the pump barrel.

A support 17 for the barrel is attached to the outer periphery of the lower part of the pump barrel, and a support frame is provided on the upper end of the support 17 and the bottom plate 12 of the inner tank.
A coil winding spring (18) is provided between the inside of the upper end of (13). Therefore, the pump barrel 5 is elastically supported by the coil winding spring 18 by absorbing and relaxing vertical fluctuation and thermal displacement.

FIG. 3 is a partial cross-sectional explanatory view in which a support frame having a displacement absorbing mechanism using a balance in a balance-like manner is provided in the lower portion of the pump barrel.

As another specific example of the displacement absorbing mechanism, in forming a balance-like gravity balance, a plurality of support pedestals 13 are provided on the inner tank bottom plate 12, and a fulcrum 19 is provided on the upper edge of the support pedestal 13. A support table 20 is horizontally attached to the fulcrum 19 to form a balance. A counterweight 21 is placed on the outer end of the support 20, and a pump barrel 5 is placed on the upper end of the inner end. In other words, the pump barrel 5 supports the outer peripheral edge of the lower end on the support base 20, and the weight of the pump barrel and the pump and the weight of the counter weight are balanced by the weight of the counter weight 21 with the fulcrum 19 of the support base 13 as the center. It is formed so that it is balanced and the vertical fluctuation and thermal displacement are absorbed and relaxed to be supported.

(Effect) Since the support device for the pump barrel of the double shell tank according to the present invention is configured as described above, it has the following unique effects.

The load of the pump barrel and the liquid therein is dispersed and supported by the inner tank roof and the support frame having a displacement absorbing mechanism provided on the bottom plate.

Therefore, since the total load of the pump barrel and the liquid therein is not applied to the inner tank roof, it is possible to reduce the thickness of the roof and to simplify the roof bone structure. In addition, reaction force due to pump start and stop, pressure fluctuation of the inner tank, and vertical expansion and contraction of the pump barrel due to temperature change are absorbed and mitigated by the displacement absorption mechanism provided on the support frame, and load fluctuation on the inner tank bottom plate and inner tank roof. A structure that is strong against fatigue failure without being repeated.

Therefore, the load of the pump barrel body, the liquid load in the pump barrel, and the reaction force during pump operation are all applied to the support part of the inner tank roof, and the expansion and contraction and fluctuation due to the temperature change and pressure change of the gas and liquid inside the tank. There is no need to convey it, and the inner tank roof will not be deformed or buckled.

Further, since the lower portion of the pump barrel is supported with elasticity or weight balance, it does not swing greatly.

Since expansion joints and bellows are not used in the pump barrel and inner tank roof connection, there is no risk of leaking stored materials and it is safe.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of a pump barrel supporting device for a double shell tank having a displacement absorbing mechanism according to the present invention, and FIG. 2 is a pump barrel supporting device. A partially omitted sectional explanatory view showing another embodiment of the displacement absorbing mechanism, and FIG. 3 is a partially omitted sectional explanatory view showing a third embodiment of the displacement absorbing mechanism of the pump barrel supporting device. Is. 2 …… Inner tank roof, 5 …… Pump barrel 11 …… Inner tank support, 12 …… Bottom plate 13 …… Support frame, 14 …… Disc springs 15 …… Support tools, 17 …… Support tools 18 …… Coil Coil spring, 19 …… fulcrum 20 …… support base, 21 …… counterweight

Claims (2)

[Scope of utility model registration request] 1. A pump barrel erected in a tank is hung and fixedly supported on an inner tank roof, and a lower portion of the pump barrel is supported by a displacement absorbing mechanism provided on a support frame on a bottom plate. A double barrel tank pump barrel support device. 2. The displacement absorbing mechanism provided on the support base is formed by providing a compression spring, a tension coil spring, or a gravity balance, and the utility model registration claim 1. Pump barrel support device for heavy shell tanks.