JP2006000741A - Strainer for liquid tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strainer for a liquid tank, which can be easily installed or removed and also can suppress waving on the surface of the liquid stored in the liquid tank. <P>SOLUTION: This strainer 26, which is installed on the pouring port 22 of the liquid tank 12 so as to be attachable/detachable, is provided with a cylindrical part 32, a filtering part 34 installed at the end of the cylindrical part 32, and a resisting part 48 installed to the lower end of the cylindrical part 32 to generate resistance on movement of the liquid stored in the liquid tank 12 thereby to exert a wave dissipating effect. With this configuration, installation of the resisting part 48 in the liquid tank 12 is completed only by installing the strainer 26 on the pouring port 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid tank mounted on a sprayer, a spreader, or the like, and more particularly to a strainer attached to an inlet of the liquid tank.

  A working machine such as a sprayer or a spreader is equipped with a liquid tank in which a liquid such as an agrochemical is stored. At the time of operations such as chemical spraying, the liquid in the liquid tank is shaken, and the center of gravity is moved, which tends to be unstable. In particular, in the case of a backpack-type work machine, the above problem is likely to occur due to the walking of the worker and the like because it is used while being carried by the worker.

  Patent Document 1 describes a technique of assembling a wave-dissipating plate in a liquid tank in order to solve such a problem. The wave-absorbing plate is installed at a substantially right angle with respect to the liquid level of the liquid in the liquid tank in a stable state, and therefore provides resistance to movement when the liquid is shaken. This prevents the liquid from spilling and reduces the center of gravity movement of the liquid tank.

Such a wave-dissipating plate is composed of a flexible plate material corresponding to the internal shape of the liquid tank. When assembling the wave-dissipating plate, the wave-dissipating plate is bent and inserted from the inlet of the liquid tank, and the bending is released inside. The released wave-dissipating plate is in a state of being hooked and assembled to the holding convex portion in the liquid tank.
JP 2003-290611 A

  However, a relatively large force is required to bend the wave-dissipating plate described in Patent Document 1 to such an extent that it can be inserted into the inlet of the liquid tank. Furthermore, when releasing the bent wave-dissipating plate in the liquid tank, it is necessary to release the bending in accordance with the position of the holding convex portion provided in the liquid tank. Therefore, there is a problem that the work of assembling the wave-dissipating plate takes time and requires familiarity with the work. Similarly, it is difficult to remove the wave-dissipating plate from the liquid tank.

  The present invention has been made to solve such a problem, and provides means capable of suppressing the ripples of the liquid stored in the liquid tank and capable of being easily attached and detached. The main purpose.

  In order to achieve the above object, the present invention provides a strainer (26) removably attached to an inlet (22) of a liquid tank (12), and a cylindrical portion ( 32), a filtration part (34) provided in the cylindrical part (32), and a liquid tank provided in the cylindrical part (32) and holding the cylindrical part (32) at the inlet (22). (12) is provided with a resistance portion (48) that is in contact with a predetermined amount of liquid stored and gives resistance to the flow of the liquid.

  In this configuration, the resistance portion (48) is a component of the strainer (26) for the liquid tank. Therefore, the attachment of the resistance portion (48) is completed by attaching the strainer (26) to the inlet (22) of the liquid tank (12). The resistance portion (48) arranged in the liquid tank (12) in this way comes into contact with and gives resistance to a predetermined amount of liquid in the liquid tank (12). Movement can be suppressed.

  Moreover, it is preferable to provide a retaining means (56) for restricting the tubular portion (32) from coming off the inlet (22). For example, when a foamable liquid is put into the liquid tank (12), the strainer (26) tries to float up due to air bubbles generated from the liquid, but the strainer (56) prevents the strainer (26) from coming off. Because it is done.

  The cylindrical part (32) is preferably rotatable around the central axis of the cylindrical part (32) while being held in the inlet (22). This is because when the cylindrical portion (32) is rotated, the resistance portion (48) is also rotated and the liquid in the liquid tank (12) can be stirred. In order to facilitate this rotation operation, it is effective to provide a knob (58) for rotating the cylindrical portion (32).

  Further, the resistance portion (48) is provided at the end opposite to the open end of the cylindrical portion (32), and has an outer shape that can be inserted into the internal space of the cylindrical portion (32) from the open end. It can be. In this configuration, a plurality of strainers (26) can be overlapped in a state where the resistance portion (48) in one strainer (26) is accommodated in the cylindrical portion (32) of the other strainer (26). And requires less storage space.

  Various configurations are conceivable for the resistance portion (48). For example, a configuration in which a plate-like body (52) is disposed at the end opposite to the open end of the cylindrical portion (32) is a simple configuration. ,preferable.

  According to the present invention, by attaching the strainer (26) to the inlet (22) of the liquid tank (12), the installation of the resistance portion (48) in the liquid tank (12) is completed at the same time. That is, the time and effort required to attach and remove the conventional wave-dissipating plate as described above to and from the liquid tank becomes unnecessary.

  Further, since the resistance portion (48) attached in this way suppresses the undulation of the liquid and the movement of the center of gravity, the work is carried out by the working machine on which the liquid tank (12) is mounted, particularly the back working machine. There is also an effect of reducing the burden on the worker who is.

  Hereinafter, preferred embodiments of the strainer according to the present invention will be described in detail with reference to the drawings. In the present specification, terms such as up and down and height are used based on the state shown in FIG.

  FIG. 1 is a schematic side view showing a back-type power sprayer to which a strainer according to the present invention can be applied in a state where the strainer is placed on a horizontal plane, and shows a partially broken inside of a liquid tank. In addition, the dashed-dotted line in FIG. 1 assumes the liquid level in a liquid tank. The illustrated back-type power sprayer 10 includes a liquid tank 12 that stores liquid such as agricultural chemicals, a pump 14 that sucks the liquid in the liquid tank 12 and pumps it to a spray nozzle (not shown), and a pump 14. An internal combustion engine 16 as a prime mover for driving and a fuel tank 18 for storing fuel of the internal combustion engine 16 are provided. These are arranged on the backpack frame 20, and the user carries out the work while carrying the backpack frame 20.

  The liquid tank 12 of such a backpack type power sprayer 10 is made of a translucent synthetic resin, and the amount of liquid inside can be visually recognized from the outside. An inlet 22 for injecting liquid into the liquid tank 12 is formed in the upper part of the liquid tank 12. The injection port 22 is a substantially cylindrical body projecting from the liquid tank 12, and a thread portion is formed on the outer peripheral surface thereof. A cap 24 for closing the injection port 22 is screwed into the screw portion.

  A liquid tank strainer 26 according to the present invention is detachably attached to the inlet 22 of the liquid tank 12. A support portion 28 that supports the strainer 26 is provided on the inner peripheral surface of the inlet 22. The support portion 28 is formed to project radially inward at a position below the open end (upper end surface) of the injection port 22. Further, as shown in FIG. 2, which is a plan view of the peripheral portion of the inlet 22, the support portion 28 is disposed at each position equally divided into a plurality of parts (four in the illustrated embodiment) on the same circumference. Has been. A fixed interval 30 is formed between the adjacent support portions 28, 28. The strainer 26 is provided with a cylindrical portion 32 which will be described in detail later. The cylindrical portion 32 is supported by being supported by the support portion 28, and the strainer 26 is held.

  As shown in FIG. 3, the strainer 26 includes a substantially cylindrical tubular portion 32 inserted into the injection port 22, and a filtration portion 34 provided at the lower end of the tubular portion 32, which are preferably It is integrally molded from synthetic resin. FIG. 3 is a perspective view showing a state in which the strainer 26 according to this embodiment is viewed from the filtration portion 34 side.

  The cylindrical portion 32 is divided into three portions along the axial direction, that is, an upper portion 36, an intermediate portion 38, and a lower portion 40 as shown in FIGS. The outer diameter of the upper part 36 is larger than the outer diameter of the intermediate part 38, and the outer diameter of the lower part 40 is smaller than the outer diameter of the intermediate part 38. More specifically, the outer diameter of the intermediate portion 38 is slightly smaller than the diameter of the circle defined by the inner edge of the support portion 28 formed at the injection port 22, and the outer diameter of the upper portion 36 is the opening of the injection port 22. It is slightly smaller than the outer diameter of the end and larger than the diameter of the circle. Therefore, when the cylindrical portion 32 is inserted into the inlet 22 from the lower portion 40, the lower portion 40 and the intermediate portion 38 pass through the region surrounded by the support portion 28, but the step 41 between the intermediate portion 38 and the upper portion 36 is supported. The cylindrical portion 32 is placed on the portion 28 and is rotatably held in the injection port 22 (see FIG. 1). In this state, since the upper end of the cylindrical portion 32 is open, it is possible to inject liquid into the cylindrical portion 32 and filter the foreign matter contained in the liquid at the filtering portion 34.

  In addition, the height of the upper part 36 of the cylindrical part 32 is from the upper surface of the support part 28 so that the open end (upper end) of the cylindrical part 32 does not protrude above the open end of the injection port 22 in the state of FIG. The height to the open end of the inlet 22 is not more than the height. Accordingly, the cap 24 can be screwed into the injection port 22 while the strainer 26 is held at the injection port 22. Further, the back surface (inner ceiling surface) of the cap 24 screwed into the injection port 22 is in contact with the upper end surface of the cylindrical portion 32 in the holding state and presses the cylindrical portion 32 downward. Is preferred. In this case, the cylindrical portion 32 (that is, the strainer 26) is fixed to the injection port 22 in a non-rotatable state while being sandwiched between the support portion 28 and the cap 24.

  The filtering portion 34 is divided by a plurality of (six in the illustrated embodiment) bone members 42 provided so as to equally divide the lower end surface of the cylindrical portion 32 in the circumferential direction, and these bone members 42. A plurality of fan-shaped openings 44 and a mesh 46 that is provided in the fan-shaped openings 44 and captures foreign substances contained in the liquid injected into the liquid tank 12 are provided.

  A resistance portion 48 is disposed below the filtration portion 34. The resistance portion 48 gives resistance to the liquid in the liquid tank 12, and is preferably integrally formed with the cylindrical portion 32 and the filtration portion 34. The resistance portion 48 in the illustrated embodiment includes an axial core 50 extending downward coaxially with the cylindrical portion 32 from the central point of the filtration portion 34, that is, the intersection of the plurality of bone members 42, and radially from the axial core 50. A plurality of (in the illustrated embodiment, six) substantially rectangular plate-like bodies 52 are provided. The plate-like bodies 52 are evenly arranged in the circumferential direction and are respectively coupled to the corresponding bone members 42. The reason why the plate-like bodies 52 are arranged uniformly is to consider the balance when the liquid is stirred, as will be described later. Further, the outer edge portion 54 of each plate-like body 52 extends upward to the step 55 between the intermediate portion 38 and the lower portion 40, and is coupled to the outer peripheral surface of the lower portion 40 of the cylindrical portion 32. As a result, the rigidity of the plate-like body 52 is improved as compared with the case where the plate-like body 52 is coupled only with the shaft core 50 and the bone member 42.

  The length (horizontal dimension) from the central axis of the shaft core 50 to the outer edge 54 is set to be equal to or less than the radius of the outer peripheral surface of the intermediate portion 38 in the cylindrical portion 32. This is because the resistance portion 48 can be easily inserted into the injection port 22. Further, regarding the height of the resistance portion 48 (the vertical dimension of the plate-like body 52), the main function of the resistance portion 48 is to provide resistance to the flow of the liquid. Therefore, as shown in FIG. It is necessary that at least a part of the resistance portion 48 be sized so as to be immersed in a certain amount of liquid in the liquid tank 12 in a state where the injection port 22 is mounted.

  Here, it should be noted that the strainer 26 in the present embodiment is configured in consideration of the stacked storage as shown in FIG. That is, in this embodiment, the lower portion 40 and the resistance portion 48 of the cylindrical portion 32 in one strainer 26 are fitted into the cylindrical portion 32 of another identical strainer 26 with relatively little play. It is possible to make it. In order to obtain such a configuration, the outer shape of the rotating body formed when the lower portion 40 of the cylindrical portion 32 and the resistance portion 48 of the strainer 26 are rotated about the central axis of the cylindrical portion 32 is simply described. The shape and dimensions are determined so as to substantially coincide with the shape defined by the inner peripheral surface and the bottom surface of the cylindrical portion 32.

  More specifically, the outer diameter of the lower portion 40 of the cylindrical portion 32 is smaller than the inner diameter of the intermediate portion 38. Further, the length from the central axis line of the shaft core 50 in the resistance portion 48 to the outer edge portion 54 of the plate-like body 52 is slightly smaller than the radius of the inner peripheral surface of the intermediate portion 38 of the cylindrical portion 32. . Since the lower part of the plate-like body 52 is accommodated in the lower part 40 having a reduced diameter of the cylindrical portion 32, the lower part of the outer edge 54 of the plate-like body 52 is substantially rectangular according to the inner shape of the lower part 40. It is cut into a shape. Further, the dimension from the step 55 between the intermediate part 38 and the lower part 40 of the cylindrical part 32 to the lower end of the resistance part 48 (height of the resistance part 48) is the dimension from the open end of the cylindrical part 32 to the bottom surface. It is equal to or smaller than (depth of the cylindrical portion 32). In this embodiment, the height of the resistance portion 48 is slightly smaller than the depth of the cylindrical portion 32, and the lower end of the intermediate portion 38 in one strainer 26 has no play at the open end of the other strainer 26. It is designed to be fitted with. This makes it possible to reliably connect the strainers 26 and 26 that are overlapped with each other, and the handling becomes easy. When a plurality of strainers 26 are overlapped as shown in FIG. 4, the overall size becomes compact, which leads to space saving and is suitable for transportation and storage.

  Furthermore, the strainer 26 in the present embodiment is provided with a retaining means for restricting upward movement from the inlet 22 of the liquid tank 12 and preventing the strainer 26 from coming out of the inlet 22. As this retaining means, in the present embodiment, a plate-like piece 56 is formed to project outward from the outer peripheral surface of the intermediate portion 38 of the cylindrical portion 32. The plate-like piece 56 has substantially the same shape as the interval 30 (see FIG. 2) defined between the adjacent support portions 28 and 28 of the injection port 22, and is slightly smaller than the interval 30. Yes. The plate-like piece 56 is disposed at a predetermined interval downward from between the upper portion 36 and the intermediate portion 38 of the cylindrical portion 32, and the interval is determined by the thickness of the support portion 28 of the injection port 22. Has also been enlarged. Therefore, when the strainer 26 is attached to the inlet 22, when the plate-like piece 56 is passed between the support portions 28, 28 and the strainer 26 is rotated about its central axis, the plate-like piece 56 is attached to the support portion 28. It becomes possible to arrange | position to a lower side, and the movement of the strainer 26 will be controlled in this state. Although at least one plate-shaped piece 56 is sufficient, it is preferable to provide the same number as the interval 30, that is, four.

  Further, the strainer 26 is provided with a knob 58 (see FIG. 1) in order to facilitate rotation around the axis. The illustrated knob 58 has a plate shape that protrudes radially inward from the inner peripheral surface of the upper portion 36 of the cylindrical portion 32 and extends in the axial direction, and is provided with at least one, preferably a plurality. In order to stack and store the plurality of strainers 26 as shown in FIG. 4, the inner edge of the knob 58 is disposed radially outward from the inner peripheral surface of the intermediate portion 38 of the cylindrical portion 32. Further, the upper end of the knob 58 is positioned below the open end of the cylindrical portion 32 so that the lower end of the intermediate portion 38 of one strainer 26 can be fitted to the open end of the cylindrical portion 32 of the other strainer 26. is doing.

  Next, a method of attaching the strainer 26 having the above configuration to the inlet 22 of the liquid tank 12 and an operation of the strainer 26 will be described assuming a case where a chemical solution having a predetermined concentration is made from the concentrated chemical solution in the liquid tank 12.

  First, the cap 24 is removed from the inlet 22 of the liquid tank 12. Next, before the strainer 26 is mounted, a predetermined amount of concentrated chemical solution is introduced from the inlet 22. After completing the charging of the concentrated chemical solution, a strainer 26 is attached to the inlet 22 of the liquid tank 12. When the strainer 26 is attached, the strainer 26 is inserted into the inlet 22 in the order of the resistance portion 48, the filtration portion 34, and the cylindrical portion 32. When the cylindrical portion 32 is inserted, the cylindrical portion 32 is rotated around its axis, and the plate-like piece 56 serving as a retaining means is aligned with the position of the interval 30 between the support portions 28 and 28 in the injection port 22. . After alignment, the plate-like piece 56 is passed through the interval 30. When the insertion of the cylindrical portion 32 is continued as it is, the step 41 of the cylindrical portion 32 is caught by the support portion 28, and the strainer 26 is supported. This state is merely a state in which the step 41 is placed on the support portion 28, so that the strainer 26 can be freely rotated. Thereafter, the cylindrical portion 32 is rotated to shift the position of the plate-like piece 56 with respect to the interval 30. This rotation operation can be easily performed by using the knob 58. The plate-like piece 56 is positioned below the support portion 28 by the rotation of the cylindrical portion 32. In this state, even if the strainer 26 is to be lifted upward, the plate-like piece 56 abuts on the support portion 28, and further upward movement is restricted.

  When the strainer 26 is thus attached to the inlet 22, water for diluting the concentrated chemical solution to a predetermined concentration is injected from the open end of the strainer 26. The amount of water to be injected is checked by looking at the liquid level from the outside of the translucent liquid tank 12 and comparing with a scale or the like carved in the liquid tank 12. Further, the foreign matter contained in the water is captured by the filtration portion 34 of the strainer 26, and the foreign matter is prevented from entering the liquid tank 12.

  In addition, when the chemical | medical solution in the liquid tank 12 is foaming, bubbles generate | occur | produce by injection | pouring of water and the force which pushes up the strainer 26 will arise. However, as described above, the strainer 26 according to the present embodiment is provided with the plate-like piece 56 and is disposed immediately below the support portion 28, so that the strainer 26 does not come off the inlet 22. Therefore, the operator does not have to worry about the position state of the strainer 26, and can concentrate on the water injection.

  When water is injected in a predetermined amount or more, the resistance portion 48 of the strainer 26 is immersed in the chemical solution in the liquid tank 12 as understood from the position of the one-dot chain line in FIG. Become. When the strainer 26 is rotated in this state, the plate-like body 52 of the resistance portion 48 turns around the axis 50 to stir the chemical solution. Here, if a wave-dissipating plate is assembled as in the prior art, even if the liquid tank 12 is shaken, undulation is prevented and a sufficient stirring effect cannot be obtained. However, according to the strainer 26 of the present embodiment, it is possible to sufficiently stir the chemical solution by an extremely simple method of simply turning the strainer 26. This has the effect of always spraying a chemical solution having a constant concentration during the chemical solution spraying operation. During the stirring, the operator can rotate the strainer 26 more easily by pinching the knob 58.

  When the stirring is completed, the cap 24 is screwed into the inlet 22. When the cap 24 is attached, the back surface of the cap 24 comes into contact with the upper end surface of the cylindrical portion 32 of the strainer 26, and the step 41 is pressed against the support portion 28. As a result, the strainer 26 is fixed to the injection port 22, and the strainer 26 is prevented from rattling in the injection port 22 during the chemical spraying operation.

  When the chemical spraying operation is performed after the cap 24 is attached, the backpack type power sprayer 10 is used while being carried on the back of the operator. Waves are likely to occur in the chemical solution in the tank 12. However, if the strainer 26 according to the present embodiment is attached to the injection port 22, the resistance portion 48 gives resistance to the flow of the chemical solution because the resistance portion 48 is immersed in the chemical solution as shown in FIG. , The expansion of the wave is suppressed. More specifically, the plate-like body 52 of the resistance portion 48 is arranged so as to intersect substantially at right angles to the liquid level of the chemical solution in the liquid tank 12 in the stable state shown in FIG. Since the plate-like bodies 52 are arranged radially, when the liquid in the liquid tank 12 swings back and forth and right and left, the movement of the plate-like body 52 is restricted by any of the plate-like bodies 52. As a result, the undulation of the liquid is suppressed, and the movement of the center of gravity of the liquid tank 12 is suppressed, so that the worker working with the power sprayer 10 on the back can work in a stable and comfortable posture. It is possible to continue.

  Such a wave-dissipating effect or a center-of-gravity movement suppressing effect can be obtained only by attaching the strainer 26 to the injection port 22. That is, the resistance portion 48 can be installed in the chemical solution simply by mounting the strainer 26. This eliminates the need for additional and troublesome work as seen in the installation of the wave-dissipating plate as in the prior art. Further, since the resistance portion 48 can be removed by removing the strainer 26, maintenance work such as replacement of the resistance portion 48 is facilitated.

  In addition, when the chemical | medical solution in the liquid tank 12 reduces, the whole resistance part 48 will be located above a liquid level, but in this state, since the gravity center itself falls below and is lightweighting, Even if it moves back and forth and left and right, the work can be continued well.

  Although the preferred embodiments of the present invention have been described in detail above, it is needless to say that the present invention is not limited to the above embodiments.

  For example, in the above embodiment, the strainer 26 for the liquid tank in the backpack type power sprayer 10 is used. However, the strainer of the present invention is also applied to a liquid tank in another apparatus or a liquid tank alone having no drive unit. be able to.

  In addition, the resistance portion may have any configuration as long as it functions as an obstacle that restricts the movement of the liquid. In addition to the plate-like body, the resistance portion is made of a rod or a sphere. There may be.

  Furthermore, in the above embodiment, the plate-like piece 56 as a retaining means is arranged below the support portion 28 through the support portions 28, 28 of the injection port 22. However, the retaining means is not limited to this. For example, an annular groove is formed on the inner periphery of the injection port 22, an elastic member that can be projected and retracted from the outer peripheral surface of the cylindrical portion 32 and biased in the protruding direction is provided, and the elastic member is engaged with the annular groove. It is also possible to attach the strainer and use it as a retaining means. In this configuration, by engaging the elastic member with the annular groove, the strainer can be attached to the injection port without the step 41.

1 is a schematic side view showing a backpack type power sprayer to which a strainer according to the present invention can be applied, in which a liquid tank is partially broken. It is a top view which shows the inlet peripheral part to which the strainer by this invention is attached. It is a perspective view which shows the state which looked at the strainer by this invention from the filtration part side. It is the side view which showed the state which accumulated two strainers by this invention, and was partly fractured | ruptured.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 10 ... Back type power sprayer, 12 ... Liquid tank, 22 ... Inlet, 24 ... Cap, 26 ... Strainer, 28 ... Support part, 32 ... Cylindrical part, 34 ... Filtration part, 48 ... Resistance part, 50 ... Shaft Core 52, plate-like body, 56 ... plate-like piece (preventing means).

Claims (6)

A strainer (26) removably attached to the inlet (22) of the liquid tank (12),
A cylindrical portion (32) held in the inlet (22);
A filtration portion (34) provided in the tubular portion (32);
The cylindrical portion (32) is in contact with a predetermined amount of liquid stored in the liquid tank (12) in a state where the cylindrical portion (32) is held in the inlet (22), and the liquid A resistance portion (48) that provides resistance to flow;
A strainer for a liquid tank.   The strainer for a liquid tank according to claim 1, further comprising a retaining means (56) for restricting the tubular portion (32) from coming off from the inlet (22).   The liquid according to claim 1 or 2, wherein the cylindrical portion (32) is rotatable about a central axis of the cylindrical portion (32) in a state where the cylindrical portion (32) is held in the inlet (22). Strainer for tank.   The strainer for a liquid tank according to claim 3, wherein a knob portion (58) for rotating the cylindrical portion (32) is provided.   The resistance portion (48) is provided at an end opposite to the open end of the tubular portion (32), and can be inserted into the internal space of the tubular portion (32) from the open end. The strainer for a liquid tank according to claim 1, comprising:   The said resistance part (48) is provided with the plate-shaped body (52) arrange | positioned by the edge part on the opposite side to the open end of the said cylindrical part (32). Strainer for liquid tanks.

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