JP2005112345A - Liquid fuel container for mobile body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid fuel container for a mobile body further reducing shocks due to an inertia without reducing a capacity inside the container as small as possible. <P>SOLUTION: This liquid fuel container 1 for a mobile body has communication holes with average opening width of 0.5 mm or more and 30 mm or less, and is equipped with porous elements 2 with porosity of 60% or more and 99% or less inside. Thereby, the porous elements are provided on a pulse impact wall face, so that an impact force of the pulse generated by the inertia can be reduced efficiently. Because of installation, the container can be inexpensively applied to the liquid fuel container of various mobile elements. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid fuel container for moving bodies.

  Conventionally, it is known that the liquid in the liquid fuel container loaded on the moving body is waved by an inertial force and gives a large impact to the inner wall surface of the container. As a result, the person who is on the moving body is uncomfortable with vibrations and the indoor quietness is impaired. For this reason, a method has been proposed in which a baffle plate is provided in the liquid fuel container of the moving body (FIG. 1) to suppress the fluctuation of the oil level of the fuel (Patent Document 1).

However, these methods do not sufficiently reduce the impact, and the internal volume of the container corresponding to the volume of the baffle plate is lost, making it difficult to secure the necessary volume.
No. 4-9318

  The present invention has been made against the background of the problems of the prior art, and an object of the present invention is to provide a liquid fuel container for a moving body that further reduces the impact due to inertial force without reducing the capacity of the container as much as possible.

  As a result of intensive studies to solve the above problems, the present inventors have finally completed the present invention. That is, the liquid fuel container for moving bodies of the present invention is characterized in that it has communication holes with an average opening width of 0.5 mm or more and 30 mm or less, and contains a porous body with a porosity of 60% or more and 99% or less.

  By adopting the above configuration, the liquid wave generated by the inertial force due to the movement of the moving body is divided by passing through the porous body in front of the wall surface before colliding with the wall surface, and the divided waves collide with each other. Since the wave energy can be reduced very efficiently by the repeated method of dividing and colliding, the wave impact on the inner wall of the liquid fuel container can be reduced. As a result, it is possible to reduce the person who is on the moving body from receiving the uncomfortable feeling of vibration, and to maintain the quietness in the room.

  As the porous body, a network structure is preferably used, and more preferably a network structure in which continuous linear bodies made of a thermoplastic resin or a thermoplastic elastomer are entangled in a three-dimensional random manner. The porous body is preferably one that can be elastically deformed.

  If the liquid fuel container for a moving body according to the present invention is used, a person riding on the moving body does not receive vibration discomfort and the quietness in the moving body chamber is not impaired.

  Hereinafter, the present invention will be described in detail.

  The liquid fuel container for moving bodies of the present invention is characterized in that a porous body having communication holes with an average opening width of 0.5 mm or more and 30 mm or less and a porosity of 60% or more and 99% or less is incorporated.

  First, the porous body used in the present invention will be described.

  The average opening width of the communication holes in the porous body used in the present invention is 0.5 mm or more, preferably 2 mm or more, and 30 mm or less, preferably 10 mm or less. When the average opening width of the communication holes is less than 0.5 mm, the waved liquid is difficult to pass through, so that the porous body receives an impact and the impact reducing effect is deteriorated. On the other hand, if the average opening width is more than 30 mm, the waved liquid fuel easily passes through the porous body in a state where the wave is not subdivided, so that the effect of reducing the impact on the wall surface is deteriorated.

  The porosity of the porous body is 60% or more, preferably 85% or more, and 99% or less, preferably 98% or less. When the porosity of the porous body is less than 60%, the passage resistance of the waved liquid increases, and it is difficult to reduce the impact smoothly. Furthermore, the internal volume of the obtained liquid fuel container is reduced. On the other hand, if the porosity is more than 99%, if the thickness is small, the wave passage is too good and the impact reduction effect is poor. Moreover, although it depends on the material, the durability of the porous body may be inferior.

  Moreover, it is a preferable aspect that the porous body of the present invention can be elastically deformed. In the case of an elastically deformable porous body, in the case of a liquid fuel container that is blow-molded, the porous body is inserted into the container from the opening for supplying fuel, and the shape is restored by inserting it while slightly deforming within the elastic recovery limit. The handling property is good.

  The porous body in the present invention is not particularly limited as long as it satisfies the above characteristics. For example, a porous body in which bursting urethane is taken in a gypsum mold and replaced with ceramic, a porous body in which a wire mesh is sintered, a porous body in which metal is sintered, and a porous body in which multiple layers are laminated by shifting the phases of each thin honeycomb structure And a net-like structure. Among these, a network structure is preferable as the porous body in the present invention, and a network structure in which continuous linear bodies are entangled in a three-dimensional random shape is more preferable. The communication hole of the porous body is suitable to have a structure that can divide and subdivide the passed wave.

  In the present invention, as the porous body, it is an extremely preferable aspect to use a network structure in which continuous linear bodies are entangled in a three-dimensional random manner. The network structure formed by confounding the continuous linear bodies in a three-dimensional random form forms a large number of arbitrary shapes such as loops having irregular sizes and directions in which a plurality of continuous linear bodies are twisted. At the same time, at least a part of the entangled portions between these linear bodies is fused to obtain a three-dimensional network structure. Although the wire diameter of a continuous filament is not specifically limited, It is 0.1 mm or more, Preferably it is 0.3 mm or more, It is desirable that it is 10 mm or less, Preferably it is 5 mm or less. This is because if the wire diameter is less than 0.1 mm, the strength of the network structure becomes low and the shape cannot be held, whereas if it exceeds 10 mm, the volume of the network structure in the liquid container increases. This is because the internal volume in the container is reduced.

  The material constituting the porous body or continuous linear body is one that is resistant to cold elution, heat resistance, oil resistance, chemical resistance, gasoline resistance, and unnecessary elution depending on the type of liquid fuel to be put in the container. It is necessary to select an appropriate material in consideration of handling properties and the like. For example, in order to improve the handleability of the obtained porous body, polyester elastomer, polyolefin elastomer, vinyl chloride elastomer, polyamide elastomer, polyurethane elastomer, rubber or rubber elastomer, and low density polyethylene, etc. It is preferable to employ one having rubber elasticity.

  Examples of the material constituting the porous body or continuous linear body include, in addition to the thermoplastic elastomer, a polyester-based thermoplastic resin, a polyolefin-based thermoplastic resin, a vinyl chloride-based thermoplastic resin, and a polyamide-based thermoplastic resin. Various thermoplastic resins such as polyurethane thermoplastic resins, fluorine resins, and biodegradable resins can be used alone or in admixture of two or more.

Among these, as a material constituting the porous body or the continuous linear body, it is a preferable aspect to use a polyolefin resin, more preferably a polyethylene resin, and still more preferably a low density polyethylene. This is because if a polyethylene-based resin, particularly low-density polyethylene is employed, a porous body excellent in gasoline elution resistance and handling properties can be obtained. The low density polyethylene that can be suitably employed in the present invention is, for example, a highly branched polyethylene synthesized using a metallocene catalyst or a Ziegler Natta catalyst. The low-density polyethylene refers to those having a density of less than 930 kg / m ³ . Particularly preferred as the porous body of the present invention is a network structure in which continuous linear bodies made of low-density polyethylene are entangled in a three-dimensional random manner.

  The shape of the porous body used in the present invention can be appropriately set according to the liquid fuel container. The thickness of the porous body is at least 20 mm or more, preferably 50 mm or more. The thicker the thickness, the greater the impact reduction effect. However, since the fuel filling capacity in the container is reduced, it is preferable to select according to the required impact reduction effect.

  The porous body used in the present invention is preferably fixed inside the container in order to exert a function of reducing the impact of the wave and not to contact a measuring sensor such as a liquid level gauge in the container. The place where the porous body is installed inside the liquid fuel container is at least in front of the wall where the wave collides, and is preferably installed so as to contact the inner wall of the container. In addition, since the wave inside the liquid fuel container is generated by the inertial force when the moving body moves, it is installed in the entire cross section of the container through which the wave passes in the direction of advance and retreat of the moving body where the liquid fuel container is installed. It is preferable to do this. In order to reduce the generated wave step by step, it is also preferable to install the porous body in multiple stages.

  Hereinafter, the present invention will be described in more detail with reference to the drawings, but the present invention is not limited to the embodiments described in the drawings. FIG. 2 is a cross-sectional view illustrating a liquid fuel container for a moving body according to the present invention. Porous bodies 2 and 2 ′ are provided on opposite wall surfaces of the container so that the porous body does not move inside the container. It is fixed by a piece. The porous body is provided on both wall surfaces inside the container so that when the liquid fuel container is installed on the moving body, the moving body moves and moves backward.

  FIG. 3 is a cross-sectional view illustrating another aspect of the liquid fuel container for moving bodies of the present invention. The porous body 2 is installed so as to fill the entire liquid fuel container. FIG. 4 is an explanatory view for explaining an aspect in which a porous body is inserted into a blow-molded liquid fuel container. As described above, if a porous body that can be elastically deformed is used as the porous body, to insert the porous body from the opening for fuel supply into the container, insert while slightly deforming within the elastic recovery limit, The shape can be recovered inside the container as shown in FIG.

  The moving body to which the liquid fuel container of the present invention can be applied is not particularly limited, and examples thereof include vehicles such as ships, airplanes, railway vehicles, automobiles, buses, trucks, and motorcycles.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the following examples, and all modifications and embodiments without departing from the gist of the present invention are not limited thereto. Included in range.

Evaluation method [Reduction degree of impact]
Liquid fuel container blow-molded for passenger cars (gasoline tank: approximately 45 cm in width, approximately 120 cm in length, approximately 20 cm in height) It has two pairs of constrictions (baffle plates) in one part. The mouth was 16 cm in diameter from the upper center and a volume of about 65 liters), except for the rear seat of the small wagon car. Each test was conducted with 50 liters of water in a liquid fuel container. In the test, 50 m per hour was accelerated to 50 km / h, and the impact level in the tank after a sudden stop was sensoryly evaluated by tactile sensation and sound, and the following ranking was performed.
Impact is very large: Grade 0 (standard for water only)
No impact: Grade 5 (standard for not putting water)
Very little impact: 4th grade Little impact: 3rd grade There is a little impact: 2nd grade A little impact: 1st grade In addition, what is positioned between 0th grade to 5th grade is 4.5th grade, 3rd grade. Grade 5, 2.5, 1.5, and 0.5 were judged.

[Handling]
The porous body was compressed as shown in FIG. 4, and the difficulty level of the work when inserting the porous body into the tank was determined.
: Easy insertion.
○: Insertion is possible, but somewhat difficult.
×: Insertion is difficult.

[Gasoline dissolution resistance]
The porous body was immersed in a gasoline solution for 100 hours, and components extracted into the gasoline solution were measured.
A: Almost no elution.
○: Slightly eluted.
×: Elution in a large amount and deformed.

[Average opening width]
The average opening width is shown by measuring the opening widths of typical openings in the longitudinal direction and the transverse direction of the obtained porous body in the vertical and lateral directions with n = 50 calipers with an accuracy of 0.01 mm. The opening width when the opening is indefinite is the shortest distance in the center of the outer shape of the opening.
Unit: mm.

[Wire diameter]
The average wire diameter is shown by measuring the thickness of a typical filament on the front and back surfaces of the obtained porous body sample with n = 50 places with a caliper with an accuracy of 0.01 mm. Unit: mm.

[Porosity of porous material]
The volume of the sample cut into a square of 30 cm in length and 30 cm in width was Vcc, the weight of the sample was Wg, the specific gravity of the sample was G, n = 3 was measured, and the porosity was obtained by the following calculation.
Porosity (%) = (1 / n) Σ ((V−W / G) / V) × 100

[Thickness of porous body]
The thickness of the four sides of the sample for which the porosity was measured was measured as n = 3 and obtained as an average value.

Example 1
Fuel supply port of liquid fuel container in which Toyobo's breath air (R) A4580 (material: polyester elastomer, wire diameter φ0.6 mm, average opening width 18 mm, porosity 96%, thickness 80 mm) is blown as a porous body And installed so as to contact the wall surface in the container. Two porous bodies are used for each of the front part and the rear part of the container, and are fixed by a wall surface in the container and a baffle plate. Table 1 shows the results of evaluating the degree of impact reduction, handling properties, and gasoline elution.

Example 2
Evaluation was performed in the same manner as in Example 1 except that one porous body used in Example 1 was inserted into the front part and rear part of the container. The evaluation results are shown in Table 1.

Example 3
As a porous body, a continuous linear body (wire diameter 0.4 mm) made of polyethylene (density 0.923, weight average molecular weight Mw / number average molecular weight Mn 2.7, melt index 20) using a metallocene catalyst is three-dimensionally random. The four woven mesh structures (average opening width 9 mm, thickness 20 mm, void ratio 97%) were used and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Example 4
Evaluation was conducted in the same manner as in Example 3 except that one porous structure used in Example 3 was used as the porous body. The results are shown in Table 1.

Example 5
As a porous body, a continuous linear body (wire diameter 0.5 mm) made of polyethylene (density 0.96, weight average molecular weight Mw / number average molecular weight Mn 4.7, melt index 20) using a Ziegler-Natta catalyst is randomly three-dimensionally. Evaluation was performed in the same manner as in Example 4 except that one mesh structure (average opening width 10 mm, thickness 20 mm, porosity 96%) was used. The results are shown in Table 1.

Comparative Example 1
Evaluation was performed with 50 liters of water in a liquid fuel container having a baffle plate without installing a porous body. The results are shown in Table 1.

Comparative Example 2
The impact reduction effect was evaluated using the same porous material as in Example 5 that was made of the same polyethylene as in Example 5 and had a thickness of 50 mm, an average aperture width of 50 mm, and a porosity of 99%. The results are shown in Table 1.

  As is apparent from Table 1, it can be seen that the liquid fuel container of the moving body in which the porous bodies of Examples 1 to 5 are installed on the collision wall surface efficiently reduces the impact force of the wave generated by the inertial force. In particular, in Example 3 in which a continuous structure made of low-density polyethylene is entangled in a three-dimensional random manner as a porous body, all of the impact reduction degree, handling properties, and gasoline resistance are all. It turns out that it is excellent. On the other hand, in Comparative Example 1, although a baffle plate is used for the tank, it can be seen that a large impact is generated. Moreover, in the porous body of Comparative Example 2, the impact reduction effect was reduced because the average opening width was too large of 50 mm, so that the waves were not subdivided and the energy of the waves could not be reduced. .

  The liquid container for a moving body of the present invention can efficiently reduce the impact force of the wave generated by the inertia force by installing a porous body on the wave collision wall, and can be easily installed. Applicable to liquid fuel containers. In particular, it is suitable as a gasoline tank for automobiles, buses, trucks, motorcycles and the like.

Sectional drawing of the conventional liquid fuel container for moving bodies. Sectional drawing which illustrates the liquid fuel container for moving bodies of this invention. Sectional drawing which illustrates another example of the liquid fuel container for moving bodies of this invention. Explanatory drawing of the aspect which inserts a porous body in the mobile body liquid fuel container of this invention.

Explanation of symbols

1: Liquid container 2: Porous body 3: Baffle plate

Claims (4)

  A liquid fuel container for a moving body having a communicating hole having an average opening width of 0.5 mm or more and 30 mm or less and a porous body having a porosity of 60% or more and 99% or less.   The liquid fuel container for moving bodies according to claim 1, wherein the porous body is a network structure.   3. The liquid fuel container for moving bodies according to claim 2, wherein the porous body is a net-like structure body in which continuous linear bodies made of a thermoplastic resin or a thermoplastic elastomer are entangled in a three-dimensional random manner.   The liquid fuel container for moving bodies according to claim 1, wherein the porous body is elastically deformable.

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