JP5695113B2 - Surface liquid recovery device - Google Patents

Description

  The present invention relates to a surface liquid recovery apparatus for recovering a surface liquid containing machine oil, foreign matters, and the like that have floated on the surface layer of the liquid.

  As this type of surface liquid recovery apparatus, the techniques of Patent Documents 1 and 2 below have been proposed. The technique described in Patent Document 1 uses a weight to make a floating body stand still below the surface of the water, and causes floating oil to flow into the cylinder from an inflow port formed in the floating body, and recovers the oil with a pipe inserted into the cylinder. It is a liquid recovery device.

  The technique described in Patent Document 2 is such that the float is allowed to settle in the coolant by a predetermined amount, and the floated material floating on the coolant is introduced into the expansion / contraction member from the inlet formed in the float, and inserted into the expansion / contraction member. This is a surface layer liquid recovery device that recovers levitated matter with a suction pipe.

JP 2008-57294 A Japanese Patent Laid-Open No. 11-333452

  In the conventional surface layer liquid recovery apparatus, there is a space where gas enters between the float and the outer members (cylinders, elastic members). And since this space exists between a float and the member of the outer side, the gas which entered here is hard to be discharged | emitted. When this happens, the float is affected by the gas. Therefore, when the float repeatedly moves up and down, its behavior is not stable, and the entire surface layer liquid recovery apparatus repeats shaking and unnecessary vertical movement.

  Alternatively, in some cases, resonance occurs in the elastic member. If the surface liquid recovery device moves in an unstable manner, unnecessary movement (for example, turbulent ripples) occurs in the surface liquid (liquid level) in the liquid tank, and the machine is approaching the vicinity of the suction port. Oil or foreign matter or the like diffuses away from the suction port, and the recovery efficiency of the surface layer liquid containing machine oil or foreign matter is reduced.

  Then, in view of the said subject, this invention aims at provision of the surface layer liquid collection | recovery apparatus which can ensure the collection | recovery efficiency of surface layer liquid by stabilizing the buoyancy which a float receives from a liquid.

  The present invention is a cylindrical expansion / contraction member having an upper end and a lower end, and is attached to the upper end of the expansion / contraction member substantially concentrically with the expansion / contraction member, and is lifted / lowered by receiving buoyancy from the liquid inside the liquid tank. And a lower end of the expansion / contraction member is attached to an upper surface of a bottom plate member held at a predetermined height inside the liquid tank, and the expansion / contraction member expands / contracts as the float moves up and down. The float includes a body portion, the body portion includes an upper surface and a lower surface, and a surface layer liquid inlet for sucking a surface layer liquid out of the liquid is formed on the upper surface. The surface layer liquid inlet port and the expansion and contraction member are communicated with each other, and a surface layer liquid passage for guiding the surface layer liquid sucked from the surface layer liquid suction port portion to the inside of the expansion and contraction member is formed in a cylindrical shape, The torso is the outer overhang and the inner overhang. When the liquid inside the expansion / contraction member is absorbed, the expansion / contraction member is expanded / contracted by the internal negative pressure and the buoyancy of the float, and the upper surface of the body part rises / lowers relative to the liquid level of the liquid. Is a surface layer liquid recovery device that intermittently flows into the elastic member.

  In the surface layer liquid recovery apparatus, the outer overhanging portion projects from the upper end portion of the expansion / contraction member toward the outside of the expansion / contraction member, and the inner overhanging portion extends from the upper end portion of the expansion / contraction member toward the inside of the expansion / contraction member. The lower surface of the outer overhanging portion and the inner overhanging portion is the lower surface of the body portion, and the lower surfaces of the outer overhanging portion and the inner overhanging portion are flush with each other. The lower surface of the portion is formed on a flat surface perpendicular to the vertical direction of the central axis of the expansion / contraction member, and the expansion / contraction member extends radially outward from the upper end portion along the lower surface of the outer overhang portion. It is characterized by having an attachment portion that spreads out and an outer overhang portion being attached to the attachment portion.

  As described above, the lower surface of the outer overhanging portion and the inner overhanging portion of the float are the lower surface of the body portion, and the lower surface of the outer overhanging portion and the inner overhanging portion are flush with each other. According to the configuration in which the lower surface of the overhanging portion is formed on a flat surface perpendicular to the vertical direction of the central axis of the elastic member, the gas (air) enters the inside of the elastic member together with the surface layer liquid. There is no place for gas to stay even if it contacts the lower surface of the inner overhang, and the gas is discharged from the surface liquid inlet, so the float is not easily affected by the gas. , Its behavior is stabilized, the liquid level of the surface layer liquid is less likely to be disturbed, and machine oil and foreign matter etc. that are approaching the vicinity of the surface layer liquid suction port diffuse or are separated from the surface layer liquid suction port The surface layer Recovery efficiency is increased.

  And in the said structure, a float and an expansion-contraction member are attached by the attachment part extended to the radial direction outer side of the outer side extension part along the lower surface of the outer side extension part from the upper end part of an expansion-contraction member.

  In the surface layer liquid recovery apparatus of the present invention, the attachment portion may employ a configuration including a covering portion that covers the outer peripheral surface of the outer overhang portion from below. According to this configuration, the float and the expansion / contraction member are attached in a state where the outer peripheral surface of the outer overhanging portion covers the lower portion from below.

  The present invention is a cylindrical expansion / contraction member having an upper end and a lower end, and is attached to the upper end of the expansion / contraction member substantially concentrically with the expansion / contraction member, and is lifted / lowered by receiving buoyancy from the liquid inside the liquid tank. And a lower end of the expansion / contraction member is attached to an upper surface of a bottom plate member held at a predetermined height inside the liquid tank, and the expansion / contraction member expands / contracts as the float moves up and down. The float includes a body portion, the body portion includes an upper surface and a lower surface, and a surface layer liquid inlet for sucking a surface layer liquid out of the liquid is formed on the upper surface. The surface layer liquid inlet port and the expansion and contraction member are communicated with each other, and a surface layer liquid passage for guiding the surface layer liquid sucked from the surface layer liquid suction port portion to the inside of the expansion and contraction member is formed in a cylindrical shape, The torso is the outer overhang and the inner overhang. When the liquid inside the expansion / contraction member is absorbed, the expansion / contraction member is expanded / contracted by the internal negative pressure and the buoyancy of the float, and the upper surface of the body part rises / lowers relative to the liquid level of the liquid. Is a surface layer liquid recovery device that intermittently flows into the elastic member.

In the surface layer liquid recovery apparatus, the outer overhanging portion projects from the upper end of the elastic member toward the outside of the elastic member, and the inner overhanging portion extends from the upper end of the elastic member toward the inside of the elastic member. The lower surface of the outer overhanging portion and the inner overhanging portion is the lower surface of the body portion, and the lower surfaces of the outer overhanging portion and the inner overhanging portion are flush with each other. The lower surface of the portion is formed on a flat surface perpendicular to the vertical direction of the central axis of the elastic member, and the elastic member extends radially inward from the upper end portion along the lower surface of the inner overhang portion. It is possible to employ a configuration in which a mounting portion that is narrowed is provided and an inner overhanging portion is attached to the mounting portion.

  In the above configuration, the float and the expansion / contraction member are attached by the attachment portion that narrows from the upper end portion of the expansion / contraction member along the lower surface of the inner extension portion to the radially inner side of the inner extension portion.

  In the surface liquid recovery apparatus of the present invention, the mounting portion may employ a configuration including a covering portion that covers the inner peripheral surface of the inner overhang portion from below. According to this configuration, the float and the expansion / contraction member are attached in a state where the inner peripheral surface of the inner overhanging portion covers the lower portion from below.

  In the surface liquid recovery apparatus of the present invention, a configuration in which the upper surface and the lower surface of the body portion are formed in an annular shape can be employed. According to this configuration, the float stably receives buoyancy from the liquid on the annular surface which is the lower surface of the outer member.

  In the surface layer liquid recovery apparatus of the present invention, the amount of protrusion from the upper end of the elastic member in the outer overhanging portion and the inner overhanging portion is set to be smaller in the outer overhanging portion than in the inner overhanging portion. A configuration can be employed. According to this configuration, when the buoyancy is unstable with respect to the inner overhanging portion on the center side of the elastic member, the float posture is stabilized by the buoyancy acting on the outer overhanging portion outside the elastic member. Is done.

  In the surface layer liquid recovery apparatus according to the present invention, the expansion and contraction member is formed in a cylindrical shape from a synthetic rubber, and has a plurality of peak portions protruding radially outward from the cylindrical center and a peak portion between the peak portions. The structure formed in the shape of a bellows provided with the several trough part which protrudes toward the shape center can be employ | adopted. According to this structure, the expansion | extension length in the up-down direction of an expansion-contraction member is determined according to the number of a peak part and a trough part.

  In the surface layer liquid recovery apparatus of the present invention, it is possible to adopt a configuration in which the outer diameter of the crest of the elastic member and the maximum outer diameter of the float are set to approximately the same dimensions. The body part receives buoyancy from the liquid at the outer overhanging part, and when the liquid is sucked into the elastic member, the inner overhanging part of the body part receives buoyancy from the liquid. Since the float receives buoyancy from both the inner overhang and the inner overhang, the height of the float is restrained from increasing, and the diameter of the peak portion of the elastic member is approximately the same as the maximum outer diameter of the float. It can be set, and the surface layer liquid recovery device can be prevented from being enlarged in the height direction.

  In the surface layer liquid recovery apparatus of the present invention, it is possible to adopt a configuration in which the upper end portion of the expandable member is a trough portion and the bottom surface of the float is attached to the trough portion. According to this configuration, the lower surface of the outer overhanging portion directly receives buoyancy from the liquid.

  In the surface layer liquid recovery apparatus of the present invention, the elastic member can employ a configuration in which the thickness of the synthetic rubber is different between the upper end portion side and the lower end portion side. According to this configuration, since the elasticity (spring constant) is different between the upper end portion side and the lower end portion side of the elastic member, resonance does not occur in the elastic member.

  In the surface layer liquid recovery apparatus of the present invention, it is possible to employ a configuration in which a drain pipe for discharging the surface layer liquid inside the expansion member to the outside of the expansion member is inserted into the surface layer liquid suction port and the surface layer liquid passage. it can. According to this configuration, the liquid that has flowed into the expansion / contraction member is sent to the outside of the expansion / contraction member by the drain pipe inserted into the surface layer liquid inlet and the surface layer liquid passage.

  In the surface layer liquid recovery apparatus of the present invention, a configuration in which a drainage pipe for discharging the surface layer liquid inside the elastic member to the outside of the elastic member can be adopted on the bottom plate member. The liquid that has flowed into the expansion / contraction member is sent to the outside of the expansion / contraction member by a drain pipe attached to the bottom plate member.

  In the surface layer liquid recovery apparatus of the present invention, the body portion includes an outer overhang portion and an inner overhang portion, and the outer overhang portion projects from the upper end portion of the elastic member toward the outside of the elastic member. Since the portion protrudes from the upper end of the expansion / contraction member toward the inside of the expansion / contraction member, when the liquid is sucked into the expansion / contraction member and the inner extension portion of the trunk portion receives buoyancy from the liquid, The buoyancy is surely received from both the outer overhanging portion and the inner overhanging portion, and therefore the buoyancy is received from the liquid in a stable state as compared with the configuration in which the buoyancy is received only on the center side of the elastic member, The behavior of the expansion / contraction member to which the float is attached is stabilized, the disturbance of the surface layer liquid is suppressed, and machine oil and foreign matter etc. that are brought close to the vicinity of the suction port diffuse or move away from the suction port. Machine oil and foreign matter etc. are not generated. It is possible to maintain the recovery efficiency of surface liquid've got.

It is a partial sectional view showing the condition of use of the surface layer liquid recovery device concerning one embodiment of the present invention. It is an expanded sectional view of the same surface layer liquid recovery device. It is a partial sectional view showing the use condition of the surface layer liquid recovery device concerning other embodiments of the present invention. It is an expanded sectional view of the same surface layer liquid recovery device. It is an expanded sectional view of the surface layer liquid recovery device concerning another embodiment of the present invention. It is an expanded sectional view of the surface layer liquid recovery device concerning another embodiment of the present invention. It is an expanded sectional view of the surface layer liquid recovery device concerning another embodiment of the present invention.

  Hereinafter, a surface layer liquid recovery apparatus (hereinafter simply referred to as “recovery apparatus”) according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the collection device 1 is for collecting (sucking) the surface layer liquid 4 out of the liquid 3 inside the liquid tank (also referred to as “pit”) 2. The recovered surface liquid 4 is transferred by a drain pipe 5 to a separation tank 6 for separating the liquid 3 into machine oil or foreign matter. Therefore, the recovery device 1 is used by being connected to the separation tank 6.

  As shown in FIG. 2, the collection device 1 includes an elastic member 7 and a float 8. The elastic member 7 is formed from a synthetic rubber (nitrile rubber is preferably used) into a cylindrical bellows shape. The bellows shape includes a plurality of peak portions 70 protruding radially outward from the cylindrical center, and a plurality of valley portions 71 between the peak portions 70 and protruding from the peak portion 70 toward the cylindrical center. ing. The lower end portion 72 of the elastic member 7 corresponds to the peak portion 70. The upper end portion 73 of the elastic member 7 corresponds to the valley portion 71.

  The lower end portion 72 of the expansion / contraction member 7 is integrally attached to the upper surface of the bottom plate member 74 held at a predetermined height position inside the liquid tank 2. The bottom plate member 74 is formed in a disc shape. The bottom plate member 74 is set to have a diameter substantially the same as the diameter of the peak portion 70 of the elastic member 7. The peak portion 70 which is the lower end portion 72 of the elastic member 7 is attached to the outer edge portion of the bottom plate member 74. Such a stretchable member 7 can be stretched along the vertical direction of the liquid tank 2 with the lower end 72 being immovable (impossible to move up and down) as the float 8 moves up and down.

  The float 8 can be raised and lowered by receiving buoyancy from the liquid 3 inside the liquid tank 2. The float 8 includes a body portion 80, and an upper surface 81 that is an annular surface and a lower surface 82 that is an annular surface are formed on the body portion 80. The upper surface 81 is formed as a conical surface inclined downward from the radially outer end toward the center. In this embodiment, the inclination angle of the conical surface is set to an angle of approximately 20 ° with respect to the horizontal plane, and the conical surface is inclined from the outer edge of the trunk portion 80 toward the center of the trunk portion 80. Yes. The float 8 is formed with a surface liquid suction port 83 for sucking the surface liquid 4 of the liquid 3. The surface liquid suction port 83 is a space having a truncated cone shape having the upper surface 81 as a side surface.

  The body 80 includes a surface liquid passage 84. The surface layer liquid passage 84 is a space for communicating the inside of the surface layer liquid suction port portion 83 and the expansion and contraction member 7 and guiding the surface layer liquid 4 sucked from the surface layer liquid suction port portion 83 to the inside of the expansion and contraction member 7. The surface liquid passage 84 is formed in the center in the radial direction of the body 80 along the vertical direction.

  The trunk portion 80 is disposed concentrically with the elastic member 7. The lower surface 82 of the trunk | drum 80 is a flat horizontal surface. A trough portion 71 which is the upper end portion 73 of the elastic member 7 is fixed to a middle portion in the radial direction of the lower surface 82 of the trunk portion 80. Of the trunk portion 80 of the float 8, an annular portion that protrudes (protrudes) toward the lateral side that is radially outward from the valley portion 71 that is the upper end portion 73 of the float 8 is the outer overhang portion 85. The lower surface 82 of the trunk portion 80 is also the lower surface of the outer overhang portion 85.

  A trough portion 71 that is the upper end portion 73 of the elastic member 7 is fixed to a midway portion in the radial direction of the lower surface 82 of the trunk portion 80 of the float 8. In this case, the valley portion 71 which is the upper end portion 73 is formed by integral molding in the middle portion in the radial direction of the lower surface 82 of the body portion 80 of the float 8. In the trunk portion 80 of the float 8, an annular portion that protrudes (protrudes) toward the side that is radially inward from the valley portion 71 that is the upper end portion 73 of the float 8 is the inner overhang portion 86. The lower surface 82 of the trunk portion 80 is also the lower surface of the inner overhang portion 86. The lower surface of the outer overhanging portion 85 and the lower surface of the inner overhanging portion 86 are flush with each other.

  As shown in FIG. 1, the overhang length L <b> 1 projecting from the upper end portion 73 of the elastic member 7 at the outer overhang portion 85 and the overhang length projecting from the upper end portion 73 of the elastic member 7 at the inner overhang portion 86. Although the ratio with L2 is not particularly limited, the amount of protrusion from the upper end 73 of the expansion / contraction member 7 in the outer overhanging portion 85 and the inner overhanging portion 86 is larger than that of the inner overhanging portion 86 The overhang portion 85 is set to be smaller. Specifically, in this embodiment, L1: L2 = 0.5: 1.0 is set.

  A trough portion 71 that is the upper end portion 73 of the elastic member 7 is fixed to a midway portion in the radial direction of the lower surface 82 of the trunk portion 80 of the float 8. Therefore, the upper end portion 73 of the elastic member 7 and the lower surface 82 of the trunk portion 80 of the float 8 are substantially at the same height.

The buoyancy acting on the float 8 due to the liquid 3 is obtained by the following equation.
π · (R ² −r ² ) H · ρ Equation (1)
here,
π: Circumference ratio R: Maximum outer diameter of the float 8 r: Diameter of the inner overhang portion 86 H: Height of the float 8 ρ: Specific gravity of the liquid 3 (see FIG. 2).

  The total weight of the float 8 needs to be larger than the buoyancy due to the liquid 3 obtained by the above formula (1). Further, the total weight of the float 8 needs to be smaller than the buoyancy acting from both the liquid (external liquid) 3 outside the recovery apparatus 1 and the liquid (internal liquid) 3 inside the recovery apparatus 1. The float 8 is formed of a synthetic resin molded product (for example, a foamed resin molded product) having a small specific gravity with respect to the liquid 3 so as to satisfy these conditions. The float 8 is formed of a synthetic resin with a solid cross section. It should be noted that the outer diameter of the crest portion 70 of the expansion / contraction member 7 and the maximum outer diameter R of the float 8 are set to substantially coincide with each other.

  The drainage pipe 5 for discharging the surface layer liquid 4 inside the expansion / contraction member 7 to the separation tank 6 outside the expansion / contraction member 7 is inserted through the surface layer liquid suction port 83 and the surface layer liquid passage 84. A lower portion, which is one side end portion of the drainage pipe 5, is in contact with the upper surface of the bottom plate member 74, and a suction port portion 50 is formed in a portion inserted into the elastic member 7. The upper part which is the other end of the drainage pipe 5 is connected to the separation tank 6. The separation tank 6 is connected to a return pipe 10 that returns the separated surface liquid 4 to the liquid tank 2.

  The outer diameter of the drainage pipe 5 is set so as to ensure a sufficient gap 87 through which the surface layer liquid 4 can pass between the outer peripheral surface 51 of the drainage pipe 5 and the peripheral surface 84 a of the surface liquid passage 84. The drainage pipe 5 is disposed concentrically with the float 8. A pump 9 for sending the surface layer liquid 4 toward the separation tank 6 is connected to the middle part of the drainage pipe 5 in the longitudinal direction.

  In the recovery device 1 configured as described above, the lower end portion 72 of the expansion and contraction member 7 is attached to the bottom plate member 74, and the bottom plate member 74 is held at a predetermined height position inside the liquid tank 2. If the water level of the liquid 3 rises to the outer overhanging portion 85 of the trunk portion 80 of the float 8, the float 8 rises due to buoyancy from the liquid 3, and the elastic member 7 attached to the upper end 73 floats the float 8. It expands according to the raised position of 8.

  When the float 8 reaches the rising limit position due to the elasticity of the elastic member 7 or the specific gravity of the float 8 with respect to the liquid 3 and the liquid level further rises, the surface liquid 4 passes from the surface liquid suction port 83 to the surface liquid passage. 84, flows into the telescopic member 7.

  When the pump 9 is driven in a state where the liquid 3 is filled in the expansion / contraction member 7, the liquid 3 inside the expansion / contraction member 7 is sucked into the drainage pipe 5, and the liquid level of the liquid 3 inside the expansion / contraction member 7. Decreases. Since the surface layer liquid suction port 83 is smaller in diameter than the diameter of the expansion / contraction member 7, the expansion / contraction member 7 contracts due to a negative pressure inside the expansion / contraction member 7, and the upper surface 81 of the trunk portion 80 of the float 8 is It sinks below the liquid level. Then, the surface layer liquid 4 of the liquid 3 flows into the surface layer liquid passage 84 and the inside of the expansion and contraction member 7 from the surface layer liquid suction port 83.

  When the surface liquid 4 flows into the elastic member 7 and the liquid level inside the elastic member 7 rises, the negative pressure inside the elastic member 7 is reduced, and the buoyancy of the float 8 causes the upper surface of the trunk portion 80 to rise. 81 (its radially outer edge) is located above the liquid level, and the inflow of the surface layer liquid 4 is stopped.

  As described above, when the liquid 3 (surface layer liquid 4) inside the expansion / contraction member 7 is sucked from the drain pipe 5 by driving the pump 9, the expansion / contraction member 7 expands / contracts due to the internal negative pressure and the buoyancy of the float 8. Then, the upper surface 81 of the body 80 floats up and down with respect to the liquid surface of the liquid 3 and is moved downward, so that the surface liquid 4 of the liquid 3 intermittently flows into the elastic member 7. Are continuously collected and the surface layer liquid 4 is fed into the separation tank 6. Then, the liquid 3 is separated into machine oil, foreign matter, and the like in the separation tank 6, and the liquid 3 is returned from the return pipe 10 to the liquid tank 2.

  The upper surface 81 of the body portion 80 is formed in a conical surface that is inclined downward from the radially outer end toward the center, and the surface liquid suction port portion 83 is a frustoconical space having the upper surface 81 as a side surface. is there. Thus, since the upper surface 81 is formed in a conical surface that is inclined downward from the radially outer end toward the center, the surface layer liquid 4 flows into the surface layer liquid inlet 83 from that wide range. be able to.

  The amount of extension of the outer overhanging portion 85 and the inner overhanging portion 86 from the upper end portion 73 of the elastic member 7 is set so that the outer overhanging portion 85 is smaller than the inner overhanging portion 86. For this reason, even if the collection | recovery apparatus 1 is provided with the outer side overhang | projection part 85, it can suppress that the collection | recovery apparatus 1 enlarges to a horizontal direction.

  Moreover, the float 8 is a form which spreads in the horizontal direction, restraining raising the height. That is, if the water level of the liquid 3 inside the liquid tank 2 reaches the outer overhanging portion 85 of the body portion 80 of the float 8, the float 8 receives buoyancy from the liquid 3, and the surface layer liquid 4 is placed inside the elastic member 7. By flowing in, the inner overhanging portion 86 of the float 8 receives buoyancy from the liquid 3. For this reason, the float 8 can receive sufficient buoyancy from the liquid 3 without using a high one. Therefore, as described above, the outer diameter of the crest portion 70 of the expansion / contraction member 7 and the maximum outer diameter of the float 8 can be obtained. The diameter R can be set to a substantially matched dimension, and the recovery device 1 can be prevented from being enlarged in the height direction.

  When the surface liquid 4 flows into the expansion member 7 from the surface liquid passage 84, the water level of the surface liquid 4 rises inside the expansion member 7, and the surface liquid 4 reaches the inner overhanging portion 86 of the trunk portion 80. The inner overhang portion 86 receives buoyancy from the surface layer liquid 4. Moreover, the outer overhanging portion 85 receives buoyancy from the surface layer liquid 4 on the outer side of the elastic member 7.

  The trunk 80 of the float 8 receives buoyancy from the liquid 3 not only from the inside of the elastic member 7 but also from the outside. When the trunk portion 80 receives buoyancy only from the inside (center side) of the elastic member 7, the behavior of the trunk portion 80 (extensible member 7) tends to become unstable, and the liquid level of the surface liquid 4 is disturbed.

  However, by adopting a configuration in which the body 80 receives the buoyancy of the liquid 3 from the outside of the elastic member 7, the portion receiving the buoyancy in the body 80 is expanded in the lateral direction. For this reason, when the trunk | drum 80 receives buoyancy, the gravity center tends to be stabilized. Therefore, the behavior of the expansion / contraction member 7 is stabilized, the liquid level of the surface liquid 4 is not easily disturbed, and machine oil or foreign matter that has been brought to the vicinity of the surface liquid inlet 83 is diffused, or the surface liquid inlet The recovery efficiency of the surface layer liquid 4 can be secured by suppressing the separation from the portion 83.

  In addition, it is conceivable that gas (air) together with the surface layer liquid 4 enters the elastic member 7 and contacts the lower surface of the inner overhanging portion 86. However, the lower surface of the inner overhang portion 86 is substantially horizontal and does not enter the interior of the elastic member 7. Further, the lower surface of the inner overhanging portion 86 is connected to a trough portion 71 that is the upper end portion 73 of the elastic member 7. The valley portion 71 is a portion of the stretchable member 7 that is directed upward toward the center of the stretchable member 7.

  With these configurations, there is no place for the air that has entered the inside of the expansion / contraction member 7 together with the surface layer liquid 4 to stay, and even if there is gas that has entered the inside of the expansion / contraction member 7 together with the surface layer liquid 4, It is hard to stay on the lower surface side of. For this reason, the float 8 is not easily affected by gas and can stabilize its behavior.

  As described above, the collection device 1 according to the present embodiment is attached to the cylindrical expansion / contraction member 7 having the upper end portion 73 and the lower end portion 72 and the upper end portion 73 of the expansion / contraction member 7 substantially concentrically with the expansion / contraction member 7. A float 8 that can be lifted and lowered by receiving buoyancy from the liquid 3 inside the liquid tank 2, and the lower end 72 of the telescopic member 7 is held at a predetermined height position inside the liquid tank 2. The elastic member 7 can be expanded and contracted as the float 8 moves up and down. The float 8 includes a trunk portion 80. The trunk portion 80 includes an upper surface 81 and a lower surface 82. A surface liquid suction port 83 for sucking the surface liquid 4 of the liquid 3 is formed, and the body 80 communicates with the inside of the surface liquid suction port 83 and the elastic member 7 from the surface liquid suction port 83. Guide the sucked surface liquid 4 into the expansion member 7 The body portion 80 further includes an outer overhang portion 85 and an inner overhang portion 86, and the outer overhang portion 85 extends from the upper end portion 73 of the elastic member 7. The inner overhanging portion 86 projects from the upper end portion 73 of the elastic member 7 toward the inner side of the elastic member 7.

  In the recovery device 1 configured as described above, the lower end portion 72 of the expansion / contraction member 7 is attached to the bottom plate member 74, and the bottom plate member 74 is held at a predetermined height position inside the liquid tank 2. If the water level of the liquid 3 reaches the outer overhanging portion 85 of the float 8, the float 8 receives buoyancy from the liquid 3, and the elastic member 7 having the float 8 attached to the upper end portion 73 extends. Then, the surface layer liquid 4 of the liquid 3 in the liquid tank 2 is sucked from the surface layer liquid suction port 83 of the float 8, and the surface layer liquid 4 reaches the inside of the elastic member 7 from the surface layer liquid passage 84.

  In the collection device 1 having the above-described configuration, the trunk portion 80 includes an outer overhang portion 85 and an inner overhang portion 86, and the outer overhang portion 85 projects from the upper end portion of the elastic member 7 toward the outside of the elastic member 7. The inner projecting portion 85 projects from the upper end portion 73 of the elastic member 7 toward the inner side of the elastic member 7. For this reason, the trunk portion 80 receives buoyancy from the liquid 3 at the outer overhanging portion 85, and when the liquid 3 is sucked into the elastic member 7, the inner overhanging portion 86 of the trunk portion 80 is reliably lifted from the liquid 3. Receive. As a result, the body 80 receives buoyancy from both the outer overhanging portion 85 and the inner overhanging portion 86, and thus the liquid in a stable state as compared with the configuration in which the buoyancy is received only on the center side of the elastic member 7. 3, the behavior of the elastic member 7 to which the float 8 is attached is stabilized, and the disturbance of the surface layer liquid 4 is suppressed.

  In the collection device 1 of the present embodiment, the upper surface 81 and the lower surface 82 of the body portion 80 are formed in an annular shape. According to this configuration, the float 8 stably receives buoyancy from the liquid 3 on the annular surface which is the lower surface 82 of the outer overhanging portion 85.

  In the collection device 1 of the present embodiment, the lower surface 82 of the outer overhanging portion 85 and the inner overhanging portion 86 is the lower surface 82 of the trunk portion 80, and the lower surface 82 of the outer overhanging portion 85 and the inner overhanging portion 86 is flush. The lower surfaces 82 of the outer projecting portion 85 and the inner projecting portion 86 are formed on flat surfaces that are orthogonal to the vertical direction of the central axis of the elastic member 7. According to this configuration, the float 8 is a flat surface in the horizontal direction and can receive buoyancy from the liquid 3 stably.

  In the collection device 1 of the present embodiment, the amount of overhang from the upper end 73 of the telescopic member 7 in the outer overhang 85 and the inner overhang 86 is greater in the outer overhang 85 than in the inner overhang 86. It is set to be smaller. According to this configuration, when buoyancy acts on the inner overhanging portion 86 in an unstable manner on the center side of the expansion / contraction member 7, the float is caused by the buoyancy acting on the outer overhanging portion 85 outside the expansion / contraction member 7. The posture of 8 is stabilized.

  In the collection device 1 of the present embodiment, the expansion and contraction member 7 is formed in a cylindrical shape from synthetic rubber, and is between a plurality of peak portions 70 projecting radially outward from the cylindrical center and the peak portions 70. It is formed in a bellows shape including a plurality of valley portions 71 protruding from the portion 70 toward the cylindrical center. According to this configuration, the expansion / contraction length in the vertical direction of the expansion / contraction member 7 is determined according to the number of peak portions 70 and valley portions 71.

  In the collection device 1 of the present embodiment, the outer diameter of the crest 70 of the expandable member 7 and the maximum outer diameter R of the float 8 are set to approximately the same dimensions. That is, the body 80 receives buoyancy from the liquid 3 at the outer overhanging portion 85, and when the liquid 3 is sucked into the elastic member 7, the inner overhanging portion 86 of the body 80 receives buoyancy from the liquid 3. As a result, the body 80 receives buoyancy from both the outer overhanging portion 85 and the inner overhanging portion 86, so there is no need to increase the height of the float 8. For this reason, it is possible to set the outer diameter of the crest portion 70 of the expandable member 7 and the maximum outer diameter R of the float 8 to approximately the same size, and it is possible to suppress the recovery apparatus 1 from being enlarged in the height direction.

  In the collection device 1 of the present embodiment, the upper end portion 73 of the elastic member 7 is a trough portion 71, and the lower surface 82 of the trunk portion 80 of the float 8 is attached to the trough portion 71. According to this configuration, the lower surface 82 of the outer overhanging portion 85 directly receives buoyancy from the liquid 3.

  In the recovery device 1 of the present embodiment, the drainage pipe 5 for discharging the surface layer liquid 4 inside the expansion / contraction member 7 to the outside of the expansion / contraction member 7 is inserted into the surface layer liquid suction port 83 and the surface layer liquid passage 84. Yes. According to this configuration, the liquid 3 that has flowed into the expansion / contraction member 7 is sent to the outside of the expansion / contraction member 7 by the drainage pipe 5 inserted through the surface layer liquid suction port 83 and the surface layer liquid passage 84.

  The collection apparatus 1 according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. Further, the surface layer liquid recovery apparatus according to the present invention is not limited to the above-described effects.

  As an aspect of the collection device 1 according to the present invention, the stretchable member 7 can employ a configuration in which the thickness of the synthetic rubber is different between the upper end portion 73 side and the lower end portion 72 side. According to this configuration, since the elasticity (spring constant) is different between the upper end portion 73 side and the lower end portion 72 side of the elastic member 7, resonance does not occur in the elastic member 7. For this reason, the behavior of the float 8 is likely to be more stable.

  As one aspect of the recovery apparatus 1 according to the present invention, as shown in FIGS. 3 and 4, the surface layer liquid 4 inside the expansion member 7 is discharged to the separation tank 6 outside the expansion member 7 on the bottom plate member 74. Therefore, it is possible to adopt a configuration in which the drainage pipe 5 is attached. That is, the drainage pipe 5 is not inserted through the surface layer liquid suction port 83 and the surface layer liquid passage 84. Accordingly, there is no gap 87 between the outer peripheral surface 51 of the drainage pipe 5 and the peripheral surface 84a of the surface liquid passage 84 as shown in FIGS. This itself becomes a space through which the surface layer liquid 4 passes.

  According to this configuration, the liquid 3 that has flowed into the expansion / contraction member 7 is sent from the drain pipe 5 attached to the bottom plate member 74 to the separation tank 6 outside the expansion / contraction member 7 by driving the pump 9. Other detailed configurations of the collection apparatus 1 are the same as those in the embodiment shown in FIGS. 1 and 2. For this reason, the same code | symbol is attached | subjected and the description is not repeated. Moreover, according to the collection | recovery apparatus 1 of the structure shown in FIG.3 and FIG.4, there can exist an effect similar to embodiment described using FIG.1 and FIG.2.

  Moreover, as one aspect | mode of the collection | recovery apparatus 1 which concerns on this invention, as shown in FIG. 5, the lower surface 82 of the inner side overhang | projection part 86 among the trunk | drum 80 is an inclined surface located upwards as the center axis | shaft side of the expansion-contraction member 7 is. It is possible to adopt the configuration formed in the above. In each of the above embodiments, the float 8 has a solid cross section, but in the embodiment shown in FIG. 5, the float 8 (the outer overhanging portion 85 and the inner overhanging portion 86) is formed in an inner air cross section. .

  According to this configuration, even when air is sucked into the expansion / contraction member 7 together with the surface layer liquid 4, the lower surface 82 of the inner overhanging portion 86 is an inclined surface positioned higher toward the central axis side of the expansion / contraction member 7. The air easily escapes to the outside of the elastic member 7. For this reason, the behavior of the float 8 is less susceptible to the influence of air and is easily stabilized. The other detailed structure of the collection | recovery apparatus 1 is the same as that of embodiment described using FIG. 3 and FIG. For this reason, the same code | symbol is attached | subjected and the description is not repeated. Moreover, according to the collection | recovery apparatus 1 of the structure shown in FIG. 5, there can exist an effect similar to embodiment demonstrated using FIG. 3 and FIG.

  In each of the above-described embodiments, the case where the trough portion 71 that is the upper end portion 73 of the expansion and contraction member 7 is formed by integral molding in the middle portion in the radial direction of the lower surface 82 of the trunk portion 80 of the float 8 has been described. However, as shown in FIG. 6, a configuration in which the trough portion 71 that is the upper end portion 73 of the expansion and contraction member 7 is attached to the middle portion in the radial direction of the lower surface 82 of the trunk portion 80 of the float 8 is also conceivable.

  The embodiment of FIG. 6 will be specifically described. A holding portion 11 that holds the trunk portion 80 of the float 8 is integrally formed at the upper end portion of the elastic member 7. The holding part 11 is made of synthetic rubber, like the elastic member 7. The holding portion 11 extends from the upper end portion (in this case, the valley portion 71) along the lower surface 82 of the outer overhang portion 85 to the outer side in the radial direction of the outer overhang portion 85 (corresponding to an attachment portion) 12. It has. An outer overhanging portion 85 is attached to the holding portion 11.

  The holding portion 11 includes an extension portion 12 extending radially outward along the lower surface of the trunk portion 80 from the valley portion 71 corresponding to a midway portion of the lower surface of the trunk portion 80 of the float 8, and the extension portion 12. And an upright portion (corresponding to a covering portion) 13 that is raised from the radially outer end of the body portion 80 along the outer peripheral surface of the body portion 80 (outside overhanging portion 85) and covers the body portion 80 from the lower side. ing.

  The extension portion 12 and the upright portion 13 are formed integrally with the body portion 80 or separately. In the case of being formed separately, in order to firmly fix the trunk portion 80 and the holding portion 11, it is preferable to include a band 14 that winds the upright portion 13. The stretchable member 7 and the float 8 (the trunk portion 80) are integrated by winding the upright portion 13 with the band 14. Since the other detailed structure of the collection | recovery apparatus 1 is the same as that of embodiment shown in FIG. 1 and FIG. 2, the same code | symbol is attached | subjected and the description is not repeated.

  By providing the holding portion 11 having the above-described configuration, the elastic member 7 and the float 8 can be configured integrally. Further, when the holding unit 11 and the float 8 are formed separately, the float 8 can be replaced by removing the band 14. Since other operational effects of the recovery apparatus 1 are the same as those of the embodiment described with reference to FIGS. 1 and 2, the description thereof will not be repeated.

  In the embodiment of FIG. 6, the upright portion 13 extends the extension portion 12 from the upper end portion of the elastic member 7 to the outer side in the radial direction (outside overhanging portion 85 side) with respect to the trunk portion 80. Established for On the other hand, in the embodiment shown in FIG. 7, the extension portion 12 is extended from the upper end portion of the elastic member 7 along the lower surface 82 of the trunk portion 80 to the radially inward side (inner projecting portion 86 side). The upright portion 13 is raised along the peripheral surface 84 a of the surface liquid passage 84.

  A frustoconical bent portion 13 a is formed at the upper end portion of the upright portion 13 so as to be slightly annularly formed radially outward on the upper surface 81 of the trunk portion 80. According to this structure, the inner overhang | projection part 86 of the float 8 is clamped by the extension part 12 and the bending part 13a, and integrates the expansion-contraction member 7 and the float 8 without using a special fixing means ( It is possible to handle them integrally. Since the other detailed structure of the collection | recovery apparatus 1 is the same as that of embodiment shown in FIG. 1 and FIG. 2, the same code | symbol is attached | subjected and the description is not repeated.

  Moreover, in this structure, although the inner overhang | projection part 86 of the float 8 is clamped by the extension part 12 and the bending part 13a, and the expansion-contraction member 7 and the float 8 are integrated, the holding | maintenance part 11 is an expansion-contraction member. As with No. 7, it is made of synthetic rubber and is therefore highly elastic. For this reason, it is easy to attach and detach the holding unit 11 and the float 8 by utilizing the elasticity of the holding unit 11.

  In each of the above embodiments, the ratio of the overhang amount between the outer overhang portion 85 and the inner overhang portion 86 has been described as 0.5: 1.0. However, the ratio of the overhang amount is not particularly limited, and the behavior of the float 8 is stabilized if the relationship is 0.3 to 0.8: 1.0. In this case, the relationship between the outer diameter of the crest 70 of the elastic member 7 and the maximum diameter R of the float 8 may not be set so as to be substantially the same. The maximum diameter R may be set larger or smaller.

  In the above embodiments, the upper end portion 73 of the elastic member 7 is the valley portion 71. However, the upper end portion 73 of the elastic member 7 may be a mountain portion 70. In this case, it is preferable that the outer projecting portion 85 protrude further to the side with respect to the peak portion 70.

  In each said embodiment, the expansion-contraction member 7 demonstrated in the case of a cylindrical shape. Moreover, the float 8 was demonstrated in the case of the cylindrical shape (ring shape) according to the shape of the expansion-contraction member 7. FIG. However, the expansion / contraction member 7 may have a rectangular tube shape. Further, the float 8 may have a rectangular tube shape (angular ring shape) according to the shape of the elastic member 7. Or the elastic member 7 may be formed in the simple cylindrical shape formed, for example from the synthetic rubber, even if it is not bellows shape.

  In each of the above embodiments, as an example of a preferable angle, the inclination angle of the conical surface is set to an angle of approximately 20 ° with respect to a horizontal plane, and the conical surface extends from the outer edge of the trunk portion 80 to the trunk portion 80. The case of the configuration inclined toward the center has been described. However, the inclination angle of the conical surface is not limited to 20 °, and may be a gentler inclination (smaller inclination) than 20 ° as long as the surface liquid 4 is taken into the surface liquid passage 84 side. It may be 10 °. Further, the inclination may be steeper (larger inclination) than 20 °, for example, 45 °.

  DESCRIPTION OF SYMBOLS 1 ... Recovery apparatus, 2 ... Liquid tank, 3 ... Liquid, 4 ... Surface layer liquid, 7 ... Elastic member, 8 ... Float, 70 ... Mountain part, 71 ... Valley part, 72 ... Lower end part, 73 ... Upper end part, 74 ... Bottom plate member, 80 ... trunk, 81 ... upper surface, 82 ... lower surface, 83 ... surface layer liquid suction port, 84 ... surface layer liquid passage, 85 ... outer overhang, 86 ... inner overhang

Claims (10)

A cylindrical expansion / contraction member having an upper end and a lower end, and a float attached to the upper end of the expansion / contraction member substantially concentrically with the expansion / contraction member and capable of ascending / descending by receiving buoyancy from the liquid inside the liquid tank; With
The lower end portion of the elastic member is attached to the upper surface of the bottom plate member held at a predetermined height position inside the liquid tank, and the elastic member can be expanded and contracted as the float moves up and down.
The float includes a body portion, the body portion includes an upper surface and a lower surface, and a surface layer liquid inlet for sucking a surface layer liquid out of the liquid is formed on the upper surface, and the body portion includes the surface layer liquid. It is formed in a cylindrical shape with a surface layer liquid passage for communicating the inside of the expansion member and the suction port portion and guiding the surface layer liquid sucked from the surface layer liquid suction port portion into the expansion member,
The trunk portion further includes an outer overhang portion and an inner overhang portion,
When the liquid inside the expansion / contraction member is absorbed, the expansion / contraction member expands / contracts due to the negative pressure and float buoyancy inside the expansion / contraction member, and the upper surface of the body part rises and falls with respect to the liquid level, and the surface liquid is intermittent A surface layer liquid recovery device that flows into the elastic member,
The outer projecting portion projects from the upper end portion of the elastic member toward the outer side of the elastic member, and the inner projecting portion projects from the upper end portion of the elastic member toward the inner side of the elastic member,
The lower surface of the outer overhanging portion and the inner overhanging portion is the lower surface of the body portion, the lower surface of the outer overhanging portion and the inner overhanging portion are flush, and the lower surfaces of the outer overhanging portion and the inner overhanging portion are Formed on a flat surface perpendicular to the vertical direction of the central axis of the elastic member,
The expansion and contraction member includes an attachment portion that extends from the upper end portion to the radially outer side of the outer overhang portion along the lower surface of the outer overhang portion, and the outer overhang portion is attached to the attachment portion. Surface layer liquid recovery device.   The surface layer liquid recovery apparatus according to claim 1, wherein the attachment portion includes a covering portion that covers the outer peripheral surface of the outer overhang portion from below. The surface layer liquid recovery apparatus according to claim 1, wherein the upper surface and the lower surface of the body portion are formed in an annular shape. Zhang volume from the top portion of the elastic member in the outside protruding portion and the inner projecting portion of claim 1 to claim 3 towards the outside protruding portion is set to be smaller than the inside projecting portion The surface layer liquid recovery apparatus according to any one of the above. The elastic member is formed in a cylindrical shape from a synthetic rubber, and has a plurality of ridges protruding radially outward from the cylindrical center and a plurality of ridges between the ridges and protruding from the ridge toward the cylindrical center. The surface layer liquid recovery device according to any one of claims 1 to 4 , wherein the surface layer liquid recovery device is formed in a bellows shape including a valley portion. 6. The surface layer liquid recovery apparatus according to claim 5 , wherein the outer diameter of the peak portion of the elastic member and the maximum outer diameter of the float are set to substantially coincide with each other. The surface layer liquid collection | recovery apparatus of Claim 5 or Claim 6 with which the upper end part of an expansion-contraction member is a trough part, and the lower surface of the float is attached to the trough part. The surface layer liquid recovery apparatus according to any one of claims 5 to 7 , wherein the elastic member has different thicknesses of the synthetic rubber on the upper end side and the lower end side. The surface layer liquid inlet portion and the surface layer fluid passage, according to any one of claims 1 to 8 drain pipe for discharging the surface layer liquid in the elastic members to the outside of the elastic member is inserted Surface liquid recovery device. The surface layer liquid recovery apparatus according to any one of claims 1 to 8 , wherein a drainage pipe for discharging the surface layer liquid inside the expansion member to the outside of the expansion member is attached to the bottom plate member.

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