JPH0585592A - Membrane type liquid storage tank - Google Patents

Abstract

PURPOSE:To store liquids of various kinds under the condition of a high temperature in a membrane type tank. CONSTITUTION:A shielding membrane 10 is formed of silicone and the like as a membrane base material. The liquid-noncontact surface of the shielding membrane 10 is reinforced with a polyester fiber, an aramid fiber or the like. The peripheral end 10c of the shielding membrane 10 is closely fixed to the inner peripheral face of a tank body 2. Weight rings 13 are set on the peripheral portions 10b (noncontact liquid surface side) of the shielding membrane 10 in such a way that the weight rings can be slidingly moved relative to the shielding membrane without being fixed thereto. Floating hoops 15 are provided under the central part 10a of the shielding membrane 10. By this method, when the volume of liquid 40 to be stored is increased or decreased, the height between the central part 10a and peripheral end 10c of the shielding membrane 10 can be smoothly adjusted in such a way that the fiber having good slide properties on the noncontact liquid surface and the weight rings 13 are moved slidingly with one another, thus a sliding liquid (sealing liquid) is not required to be used. The liquid 40 to be stored can be sealed with the shielding membrane 10 only, which has chemical resistance and heat resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane-type liquid for storing a liquid containing a volatile component, a liquid having a risk of fire, a liquid which does not come into direct contact with the atmosphere, etc. at a high temperature. Regarding storage tanks.

[0002]

2. Description of the Related Art Conventionally, a floating roof type tank, a retractable roof type tank,
Membrane tanks are used. Among these, the membrane tank is particularly effective, and has no respiratory loss, no filling loss, and no atmospheric contact.

[0003]

However, in the conventional membrane type tank, synthetic rubber such as NBR is used as the material of the shielding film, and as a means for preventing the sliding of the shielding films on the inner wall of the tank. Since a moving liquid (sealing liquid) is used, it was impossible to use due to selection of sliding liquid at high temperature, chemical resistance, heat resistance, etc. Therefore, the conventional membrane tank is limited in use to an oil tank, a pure water tank, and the like, and is also limited to storing a liquid at room temperature (up to 60 ° C.) under substantially atmospheric pressure.

In view of the above circumstances, an object of the present invention is to provide a membrane type liquid storage tank capable of storing various liquids even at a high temperature (60 ° C. to 180 ° C.) to some extent.

[0005]

The present invention has a hollow tank body (2), and the shielding film (10) is made of a heat and chemical resistant material, and the liquid contact surface is made of the heat and chemical resistant material. Then, the non-wetted surface is formed by reinforcing the heat-resistant and good-sliding fiber, and the shielding film (10) is provided inside the tank body (2) in the upper space of the tank body (2). 3) and the lower space (4) are shielded from each other, and the peripheral end portion (10c) is provided so as to be closely fixed to the tank body (2), and the tank body (2) is provided inside the tank body (2). ) An annular weight (13) having a shape corresponding to the inner shape of the shielding film (1).
0) The peripheral portion (10b) of the shield film (10) is pressed and is provided so as to move relative to the peripheral portion (10b) of the shielding film (10).

The numbers in parentheses () indicate the corresponding elements in the drawings for the sake of convenience, and the present description is not limited to the description in the drawings. The same applies to the column of "action" below.

[0007]

With the above structure, when the amount of the stored liquid (40) increases or decreases, the peripheral portion (10b) of the shielding film (10) moves to the weight (1).
When pressed by 3), it slides relative to the weight (13), and the stored liquid (40) acts so as to be sealed by the shielding film (10) having heat and chemical resistance. To do.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the membrane liquid storage tank according to the present invention.

As shown in FIG. 1, a membrane type liquid storage tank 1
Has a tank main body 2, and the tank main body 2 has a substantially circular roof 2a and a cylindrical wall 2b having an inner diameter D1.
It is hollow. And the roof 2 of the tank body 2
At a, an atmospheric valve 6 is provided so as to maintain the internal pressure of the tank body 2 at atmospheric pressure. Also, the tank body 2
A pedestal 7 such as a weight ring 13 described later is provided at the bottom of the.

A shielding film 10 is provided inside the tank body 2. The shielding film 10 is composed of a central portion 10a and a peripheral portion 10b. Central part 10a
Is formed in a circular shape having a diameter D3 substantially equal to the inner diameter D1 of the tank body 2, and the peripheral portion 10b is formed in a cylindrical shape having a length substantially equal to the height of the tank body 2. The shielding film 10 is formed of a material having heat resistance and chemical resistance, such as silicone, which is elastically deformable, as a film material (whole material). The non-wetted surface of the shielding film 10 (the surface on the upper side in the drawing, the surface on the upper space 3 side described later) is reinforced with reinforcing fibers having heat resistance and good slidability. As the reinforcing fiber, polyester fiber is particularly effective for naphthalene stored at 80 ° C., and aramid fiber is particularly effective for phthalic anhydride stored at 130 ° C. Incidentally, the liquid contacting surface of the shielding film 10 (the lower surface in the drawing, the surface on the lower space 4 side described later) is not provided with reinforcing fibers, and remains as a film material such as silicone.

The shielding film 10 is provided inside the tank body 2 in such a manner that the peripheral end portion 10c is fixedly adhered to the upper inner peripheral surface of the tank body 2 over the entire circumference. And
The internal space of the tank body 2 is completely divided and shielded by the shielding film 10 into the upper space 3 and the lower space 4. Further, an air vent 11 is provided in the central portion 10 a of the shielding film 10 in such a manner that the air in the lower space 4 can be discharged to the upper space 3.

A weight ring 13 is provided inside the tank body 2. The weight ring 13 is formed in an annular shape having a diameter D2 (D2 <D1) substantially equal to the inner diameter D1 of the tank body 2. Has been done. The weight ring 13 is mounted on the shielding film 10 (on the non-wetted surface side) in such a manner that the peripheral portion 10b of the shielding film 10 is bent at an arbitrary position and pushed downward in the drawing. Further, the weight ring 13 is not fixed to the peripheral portion 10b of the shielding film 10, and the weight ring 13 and the peripheral portion 10b can relatively slide.

Further, a floating hoop 15 is provided inside the tank main body 2, and the floating hoop 15 is provided in the tank main body 2.
Is formed in an annular shape having a diameter D3 (D3 <D2) that is substantially equal to the inner diameter D1. Then, the floating hoop 15 is provided with the shielding film 1.
The central portion 10a of 0 is pushed upward in the figure to form the shielding film 1
It is floating above the stored liquid 40 under zero.

Therefore, since the shielding film 10 is pressed upward in the drawing by the floating hoop 15 and pressed downward in the drawing by the weight ring 13, it is possible to always maintain the extended state.

Since the membrane type liquid storage tank 1 has the above-mentioned structure, when storing the stored liquid 40,
The stored liquid 40 is stored in the lower space 4 below the shielding film 10 in the figure.
To house.

At this time, since the shielding film 10 is formed of a film material such as silicone having chemical resistance, oil,
Not limited to pure water, various stored liquids 40 such as naphthalene and phthalic anhydride can be stored. In addition, the shielding film 10
Is made of heat-resistant silicone or the like as a film material, and further has heat-resistant polyester fibers, aramid fibers or the like as reinforcing fibers, and no sliding liquid (sealing liquid) is used. Not only the stored liquid 40, but also the stored liquid 40 having a somewhat high temperature (60 ° C. to 180 ° C.) can be stored.

When the amount of the liquid to be stored 40 in the membrane type liquid storage tank 1 increases, the central portion 10a of the shielding film 10 and the portion between the weight ring 13 and the floating hoop 15 of the peripheral portion 10b float. It is pressed upward in the figure by 15. Then, the peripheral portion 10b of the shielding film 10 relatively slides with respect to the weight ring 13 from the peripheral end portion 10c side to the central portion 10a side (that is, the bending position of the peripheral portion 10b moves). Also, the weight ring 13 rises upward in the figure. Then, the central portion 10a of the shielding film 10 rises upward in the figure while maintaining the extended state of the peripheral portion 10b.

When the stored liquid 40 in the membrane type liquid storage tank 1 decreases, the weight of the central portion 10a of the shielding film 10 and the portion of the peripheral portion 10b between the weight ring 13 and the floating hoop 15 is reduced. It is pressed downward in the figure by the ring 13. Then, the peripheral portion 10b of the shielding film 10 slides relative to the weight ring 13 from the central portion 10a side to the peripheral end portion 10c side (that is, the bending position of the peripheral portion 10b moves). ,
Further, the weight ring 13 descends downward in the figure. And
The central portion 10a of the shielding film 10 descends downward in the figure while maintaining the stretched state of the peripheral portion 10b.

When the central portion 10a of the shielding film 10 moves up and down, the peripheral portion 10b slides on the weight ring 13,
Although it is bent, the non-wetted surface of the shielding film 10 (the surface in contact with the weight ring 13) is reinforced by reinforcing fibers such as polyester fiber and aramid fiber, and has good slidability,
It is possible to prevent damage due to sliding of the peripheral portion 10b.

The peripheral edge portion 10c of the shielding film 10 is
The liquid to be stored 40 in the lower space 4 is completely sealed by the shielding film 10 because it is tightly fixed to the inner peripheral surface of the tank body 2. Even if the stored liquid 40 increases or decreases, the weight ring 13 is slid on the reinforcing fiber having good slidability to smoothly move the bending position of the peripheral portion 10b of the shielding film 10. Since the height (distance) between the central portion 10a and the peripheral end portion 10c can be adjusted, sliding liquid (sealing liquid)
The stored liquid 40 can be sealed without using.

That is, in the membrane type liquid storage tank 1,
Since the stored liquid 40 can be sealed only by the shielding film 10 having chemical resistance and heat resistance, various stored liquids 40
Can be stored at some high temperature. Therefore,
With respect to the various stored liquids 40, it is possible to contribute to loss prevention, pollution prevention, and atmospheric shutoff.

[0022]

As described above, according to the present invention, it has a hollow tank body 2, and the shielding film 10 is made of a heat resistant and chemical resistant material such as silicone, and the liquid contact surface is made of the heat resistant and chemical resistant material. Of a non-wetted surface, the non-wetted surface is reinforced with a heat-resistant and good-sliding fiber such as polyester fiber or aramid fiber, and the shielding film 10 is provided inside the tank body 2. 2, the upper space 3 and the lower space 4 are shielded, and the peripheral end portion 10c is provided so as to be tightly fixed to the tank body 2, and the inside of the tank body 2 corresponds to the inner shape of the tank body 2. A weight such as a ring-shaped weight ring 13 having a shape is provided so as to press the peripheral portion 10b of the shielding film 10 and slide relative to the peripheral portion 10b of the shielding film 10. , Sliding when increasing or decreasing the stored liquid 40 By sliding the weight ring 13 on the non-wetted surface reinforced by the good reinforcing fiber, the shielding film 10 can be smoothly moved up and down without using the sliding liquid (sealing liquid). I can. Then, the shielding film 10
Has chemical resistance, heat resistance, and sliding liquid (sealing water)
Since the liquid to be stored 40 is not used, not only oil and pure water but also various liquids such as naphthalene and phthalic anhydride can be stored as the liquid to be stored 40.
It can be stored even at a somewhat high temperature (60 ° C to 180 ° C).

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a membrane type liquid storage tank according to the present invention.

[Explanation of symbols]

 1 ... Membrane type liquid storage tank 2 ... Tank body 3 ... Upper space 4 ... Lower space 10 ... Shielding film 10b ... Peripheral part 10c ... Peripheral end part 13 ... Weight (weight ring)

Claims (1)

[Claims] 1. A fiber having a hollow tank main body, wherein the shielding film is made of a heat and chemical resistant material, and the liquid contact surface is kept as the heat and chemical resistant material, and the non-wetted surface is heat resistant and slidable fiber. Formed in a form reinforced by, in the inside of the tank main body, the shielding film is provided in a form of shielding the upper space and the lower space of the tank main body, in a form in which the peripheral end is closely fixed to the tank main body, Inside the tank body, an annular weight having a shape corresponding to the inner shape of the tank body is pressed down on the peripheral portion of the shielding film and is moved relatively to the peripheral portion of the shielding film. Membrane-type liquid storage tank configured and provided.