WO2014006965A1

WO2014006965A1 - Surface layer liquid collection device

Info

Publication number: WO2014006965A1
Application number: PCT/JP2013/062523
Authority: WO
Inventors: 山本　英雄
Original assignee: 広和エムテック株式会社
Priority date: 2012-07-04
Filing date: 2013-04-30
Publication date: 2014-01-09
Also published as: JP2014012245A; JP5180395B1

Abstract

A surface layer liquid collection device provided with a cylindrical stretchable member having an upper end and a lower end, and a float attached to the upper end of the stretchable member approximately concentrically with the stretchable member, wherein the lower end of the stretchable member is attached to the upper surface of a bottom plate member held at a predetermined height position within a liquid tank, the float is provided with a barrel, the barrel is provided with an upper surface and a lower surface, a surface layer liquid suction port for sucking surface layer liquid from liquid is formed in the upper surface, the barrel is provided with a surface layer liquid passage for guiding the surface layer liquid sucked from the surface layer liquid suction port into the stretchable member by causing the surface layer liquid suction port and the interior of the stretchable member to communicate with each other, and is formed into a cylindrical shape, the barrel is further provided with an outward projecting portion and an inward projecting portion, the outward projecting portion projects from the upper end of the stretchable member to the outside of the stretchable member, and the inward projecting portion projects from the upper end of the stretchable member to the inside of the stretchable member.

Description

Surface liquid recovery device

The present invention relates to a surface liquid recovery apparatus for recovering a surface liquid containing machine oil, foreign matter, and the like floating on the liquid surface layer.

As this type of surface liquid recovery apparatus, the technique described in Patent Document 1 below has been proposed. The surface layer liquid recovery device recovers (sucks) the surface layer liquid out of the liquid in the liquid tank. The recovered surface layer liquid is transferred to a separation tank. In the separation tank, the surface layer liquid is separated into liquid and machine oil or foreign matter. Therefore, the surface layer liquid recovery apparatus is used connected to the separation tank.

The conventional surface liquid recovery apparatus includes a flexible member and a float. The flexible member includes a base body, an elastic member, and an attachment member. The substrate is held at a predetermined height position in the liquid tank. The expansion / contraction member is attached to the upper surface of the base and is extendable along the vertical direction of the liquid tank. An attachment member is fixed to the upper end part of an expansion-contraction member, and supports a float.

A drain pipe is connected to the base body, and a pump for transferring the surface liquid to the separation tank is connected to the drain pipe. The attachment member is formed in an annular shape, and a support hole for inserting and supporting the float is formed in the central portion in the radial direction. The elastic member is formed in a cylindrical bellows shape from nitrile rubber or the like.

The float is formed in a cylindrical shape having a smaller diameter than that of the expansion / contraction member, and is inserted and supported in the support hole of the mounting member. The float has a lower part and an upper part. The lower part reaches the inside of the elastic member by being inserted through the support hole of the mounting member. The upper part protrudes upward from the mounting member. The float has a suction port on the top surface and an introduction path in the center. The introduction path communicates with the suction port.

In the surface liquid recovery apparatus having the above-described configuration, when the liquid in the liquid tank (for example, cutting fluid for machine tools) does not reach the float, the flexible member expands and contracts due to its own weight, the float's own weight, and the like. It is in a state. However, when the liquid accumulates in the liquid tank and the liquid reaches the upper part of the float, the float receives buoyancy from the liquid and rises with the liquid level. And the expansion-contraction member attached to the float via the attachment member is extended so as to follow the rise of the float.

When the float reaches the rising limit position due to the elasticity of the expansion / contraction member, the specific gravity of the float with respect to the liquid, and the liquid level further rises, the surface layer liquid flows into the expansion / contraction member from the suction port of the float. When the surface layer liquid flows into the elastic member from the suction port of the float and reaches the lower part of the float, the float receives the buoyancy of the surface layer liquid inside the flexible member. The surface layer liquid that has flowed into the expansion member is sequentially transferred from the discharge pipe to the separation tank by driving the pump.

Japanese Patent No. 2635482

In the above conventional surface layer liquid recovery apparatus, the float is formed to have a smaller diameter than the diameter of the expansion / contraction member, and is held so as to be inserted through the substantially central position of the attachment member attached to the upper end of the expansion / contraction member. For this reason, when the surface layer liquid flows into the expansion / contraction member from the suction port portion of the float, the air sucked together with the surface layer liquid easily accumulates in the space between the lower portion of the float and the inner surface of the expansion / contraction member. The air sucked into the space between the lower part of the float and the inner surface of the expansion / contraction member is increased or decreased due to the inflow of the surface layer liquid to the expansion / contraction member, or moved to an unexpected location. Not stable.

In that case, the buoyancy that the float receives from the surface layer liquid inside the elastic member is not stable, and therefore the posture of the float is not stable. Further, the entire surface liquid recovery apparatus repeats shaking and unnecessary vertical movement (in some cases, resonance occurs in the elastic member). When the surface layer liquid recovery device moves in an unstable manner, unnecessary movement (for example, turbulent ripples) occurs in the surface layer liquid (liquid level) in the liquid tank.

If unnecessary movement occurs in the surface layer liquid in the liquid tank, machine oil or foreign matter that has been brought to the vicinity of the suction port diffuses or moves away from the suction port, causing machine oil or foreign matter to be removed. The recovery efficiency of the contained surface layer liquid will decrease.

Therefore, in view of the above problems, the present invention has an object to provide a surface layer liquid recovery apparatus that can secure the recovery efficiency of the surface layer liquid by stabilizing the buoyancy that the float receives from the liquid.

The present invention is a cylindrical expansion / contraction member having an upper end portion and a lower end portion, and is attached to the upper end portion of the expansion / contraction member substantially concentrically with the expansion / contraction member, and can be raised and lowered by receiving buoyancy from the liquid inside the liquid tank. A lower end of the expansion / contraction member is attached to an upper surface of a bottom plate member held at a predetermined height position 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 suction port for sucking a surface layer liquid out of the liquid is formed on the upper surface, and the body portion Is formed in a cylindrical shape including a surface layer liquid passage that communicates the inside of the surface layer liquid suction port and the expansion and contraction member, and the surface layer liquid passage allows the surface layer liquid sucked from the surface layer liquid suction port portion of the expansion and contraction member Configured to guide the interior to the barrel Further includes an outer overhanging portion and an inner overhanging portion, and when the liquid inside the expansion / contraction member is absorbed, the expansion / contraction member is expanded / contracted by the internal negative pressure and float buoyancy, and the upper surface of the trunk portion is liquid The surface layer liquid recovering device that rises and falls with respect to the liquid level and the surface layer liquid intermittently flows into the elastic member. The outer projecting portion extends from the upper end of the elastic member to the outside of the elastic member. Projecting toward the inside of the telescopic member from the upper end of the telescopic member, and the lower surface of the outer projecting unit and the inner projecting unit is the lower surface of the body part, The lower surfaces of the outer overhanging portion and the inner overhanging portion are flush with each other, and the lower surfaces of the outer overhanging portion and the inner overhanging portion are formed on a flat surface orthogonal to the vertical direction of the central axis of the elastic member. It is characterized by that.

In the surface layer liquid recovery apparatus having the above configuration, the lower end portion of the expansion / contraction member is attached to the bottom plate member, and the bottom plate member is held at a predetermined height position inside the liquid tank. For this reason, if the water level of the liquid inside the liquid tank reaches the outer overhang portion of the float, the float receives buoyancy from the liquid, and the elastic member attached to the upper end of the float extends. And the surface layer liquid of the liquid in a liquid tank is suck | inhaled from the surface layer liquid suction inlet of a float, and surface layer liquid reaches the inside of an expansion-contraction member from a surface layer liquid channel | path.

In the surface layer liquid recovery apparatus having the above-described configuration, the body portion includes the outer overhang portion and the 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, The portion projects from the upper end of the elastic member toward the inside of the elastic member. For this reason, the trunk portion receives buoyancy from the liquid at the outer overhanging portion, and when the liquid is sucked into the elastic member, the inner overhanging portion of the trunk portion reliably receives the buoyancy from the liquid. Then, the trunk portion receives buoyancy from both the outer overhang portion and the inner overhang portion. Therefore, the buoyancy is received from the liquid in a stable state as compared with the configuration in which the buoyancy is received only at the center side of the expansion / contraction member, so that the behavior of the expansion / contraction member to which the float is attached is stabilized and the disturbance of the surface liquid is suppressed. . Furthermore, according to the above configuration, the float is a flat surface in the horizontal direction, and can receive buoyancy from the liquid stably.

As an aspect of the surface liquid recovery apparatus according to 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 overhanging portion.

The present invention is a cylindrical expansion / contraction member having an upper end portion and a lower end portion, and is attached to the upper end portion of the expansion / contraction member substantially concentrically with the expansion / contraction member, and can be raised and lowered by receiving buoyancy from the liquid inside the liquid tank. A lower end of the expansion / contraction member is attached to an upper surface of a bottom plate member held at a predetermined height position 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 suction port for sucking a surface layer liquid out of the liquid is formed on the upper surface, and the body portion Is formed in a cylindrical shape including a surface layer liquid passage that communicates the inside of the surface layer liquid suction port and the expansion and contraction member, and the surface layer liquid passage allows the surface layer liquid sucked from the surface layer liquid suction port portion of the expansion and contraction member Configured to guide the interior to the barrel Further includes an outer overhanging portion and an inner overhanging portion, and when the liquid inside the expansion / contraction member is absorbed, the expansion / contraction member is expanded / contracted by the internal negative pressure and float buoyancy, and the upper surface of the trunk portion is liquid The surface layer liquid recovering device that rises and falls with respect to the liquid level and the surface layer liquid intermittently flows into the elastic member. The outer projecting portion extends from the upper end of the elastic member to the outside of the elastic member. The inner overhanging portion projects from the upper end of the elastic member toward the inner side of the elastic member, and the lower surface of the inner overhanging portion of the body portion is higher toward the central axis side of the elastic member. It is characterized by being formed on an inclined surface located in Moreover, the structure formed in cyclic | annular form can be employ | adopted for the upper surface and lower surface of a trunk | drum.

As one aspect of the surface layer liquid recovery apparatus according to the present invention, a configuration in which the lower surface of the inner overhanging portion of the trunk portion is formed on an inclined surface positioned higher toward the central axis side of the elastic member can be employed. According to this configuration, even if air is sucked into the elastic member together with the surface layer liquid, the lower surface of the inner overhanging portion is an inclined surface positioned upward toward the central axis side of the elastic member. Easily escape to the outside.

As an aspect of the surface layer liquid recovery apparatus according to the present invention, the amount of protrusion from the upper end portion of the expansion / contraction member in the outer overhang portion and the inner overhang portion is smaller in the outer overhang portion than in the inner overhang portion. The configuration set as described above can be adopted. 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. It becomes.

As one aspect of the surface layer liquid recovery apparatus according to the present invention, the expansion and contraction member is formed in a cylindrical shape from synthetic rubber, and is between a plurality of peak portions protruding radially outward from the cylindrical center, and the peak portion. The structure formed in the shape of a bellows provided with the several trough part which protrudes toward a cylindrical center from a peak part is employable. According to this structure, the expansion-contraction 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.

As an aspect of the surface layer liquid recovery apparatus according to the present invention, 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 can be employed. The trunk portion receives buoyancy from the liquid at the outer overhanging portion, and when the liquid is sucked into the elastic member, the inner overhanging portion of the trunk portion receives the buoyancy from the liquid. Then, the trunk portion receives buoyancy from both the outer overhang portion and the inner overhang portion. Therefore, according to the configuration of the one aspect, the float can be set to a dimension that substantially matches the outer diameter of the peak portion of the elastic member and the maximum outer diameter of the float while suppressing an increase in the height thereof. It is possible to suppress the surface layer liquid recovery device from becoming large in the height direction.

As an aspect of the surface layer liquid recovery apparatus according to the present invention, a configuration in which the upper end portion of the elastic member is a valley portion and the lower surface of the float is attached to the valley portion can be adopted. According to this configuration, the lower surface of the outer overhanging portion directly receives buoyancy from the liquid.

As an aspect of the surface layer liquid recovery apparatus according to the present invention, the stretchable member may 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, the elasticity (spring constant) differs between the upper end portion side and the lower end portion side of the elastic member. For this reason, resonance does not occur in the elastic member.

As one aspect of the surface layer liquid recovery apparatus according to the present invention, a structure 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. Can be adopted. 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.

As one aspect of the surface liquid recovery apparatus according to the present invention, a configuration in which a drainage pipe for discharging the surface 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 elastic member is sent to the outside of the elastic 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. The portion projects from the upper end of the elastic member toward the inside of the elastic member. For this reason, when the liquid is sucked into the elastic member and the inner overhanging portion of the trunk portion receives buoyancy from the liquid, the trunk portion reliably receives buoyancy from both the outer overhanging portion and the inner overhanging portion. It will be. Therefore, the buoyancy is received from the liquid in a stable state as compared with the configuration in which the buoyancy is received only at the center side of the expansion / contraction member, so that the behavior of the expansion / contraction member to which the float is attached is stabilized and the disturbance of the surface liquid is suppressed. . For this reason, the recovery efficiency of the surface fluid containing machine oil and foreign matter does not occur without causing the phenomenon that the machine oil or foreign matter that has been brought to the vicinity of the suction port diffuses or separates from the suction port. Can be maintained.

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.

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. The recovery device 1 is used by being connected to a 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 telescopic 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. A lower end portion 72 of the elastic member 7 is a peak portion 70. The peak portion 70 is attached to the outer edge portion of the bottom plate member 74. Such an expandable member 7 can be expanded and contracted along the vertical direction of the liquid tank 2 in a state where the lower end 72 is immovable (cannot be moved 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 in 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. The conical surface is inclined from the outer edge of the trunk portion 80 toward the center of the trunk portion 80. 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 liquid passage 84 is a space. The surface liquid passage 84 is formed by communicating the surface liquid suction port 83 and the inside of the elastic member 7. The surface layer liquid 4 sucked from the surface layer liquid suction port 83 is guided into the elastic member 7 by the surface layer liquid passage 84. The surface liquid passage 84 is formed in the center in the radial direction of the body 80 along the vertical direction.

The trunk 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. The outer projecting portion 85 is an annular portion that protrudes (projects) from the trough portion 71 that is the upper end portion 73 of the float 8 toward the side that is radially outward in the trunk portion 80 of the float 8. The lower surface 82 of the trunk portion 80 is also the lower surface of the outer overhang portion 85.

The trough part 71 which is the upper end part 73 of the expansion-contraction member 7 is being fixed to the middle part of the lower surface 82 of the trunk | drum 80 of the float 8 in the radial direction. In this case, the valley portion 71 is formed by integral molding at a midway portion in the radial direction of the lower surface 82 of the body portion 80 of the float 8. The inner projecting portion 86 is an annular portion that projects (projects) from the trough portion 71 that is the upper end portion 73 of the float 8 toward the side that is radially inward of the trunk portion 80 of the float 8. 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 projecting from the upper end portion 73 of the elastic member 7 at the inner overhang portion 86. The ratio with the length L2 is not particularly limited. In this case, the amount of overhang from the upper end 73 of the expansion / contraction member 7 in the outer overhang 85 and the inner overhang 86 is set smaller in the outer overhang 85 than in the inner overhang 86. Specifically, in this embodiment, L1: L2 = 0.5: 1.0 is set.

The trough part 71 which is the upper end part 73 of the expansion-contraction member 7 is being fixed to the middle part of the lower surface 82 of the trunk | drum 80 of the float 8 in the radial direction. 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 that the float 8 receives from 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). The total weight of the float 8 needs to be smaller than the buoyancy received from both the liquid (external liquid) 3 outside the collection apparatus 1 and the liquid (internal liquid) 3 inside the collection 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 in a solid cross section from a synthetic resin. The outer diameter of the crest portion 70 of the elastic 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 into the surface layer liquid suction port 83 and the surface layer liquid passage 84. A lower part which is one side end part of the drainage pipe 5 is in contact with the upper surface of the bottom plate member 74. 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. Connected to the separation tank 6 is 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 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 drain pipe 5 is arranged 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 having the above-described configuration, the lower end portion 72 of the telescopic 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. For this reason, if the water level of the liquid 3 inside the liquid tank 2 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 float 8 moves to the upper end portion 73. The expansion / contraction member 7 attached to is extended according to the rising position of the float 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. The surface liquid suction port 83 has a smaller diameter than the diameter of the elastic member 7. For this reason, the inside of the expansion / contraction member 7 becomes negative pressure, the expansion / contraction member 7 contracts, and the upper surface 81 of the trunk portion 80 of the float 8 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 layer 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 81 ( The radially outer edge) is located above the liquid level, and the inflow of the surface liquid 4 is stopped.

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 is expanded and contracted by the internal negative pressure and the buoyancy of the float 8, and the body part. The upper surface 81 of 80 rises up and down with respect to the liquid surface of the liquid 3 and moves downward, so that the surface layer liquid 4 of the liquid 3 intermittently flows into the expansion member 7. By this operation, the surface layer liquid 4 is continuously collected, and the surface layer liquid 4 is fed into the separation tank 6. The surface layer liquid 4 is separated into the liquid 3 and machine oil or foreign matter 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, the upper surface 81 is formed in a conical surface that is inclined downward from the radially outer end toward the center. The surface liquid 4 can flow into the surface liquid suction port 83 from a wide range as much as the upper surface 81 is formed as a conical surface inclined downward from the radially outer end toward the center.

The amount of extension of the outer overhanging portion 85 and the inner overhanging portion 86 from the upper end portion 73 of the stretchable 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.

Float 8 has a shape that is expanded in the horizontal direction while suppressing its height from increasing. 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. Inflow. Thus, the inner overhang portion 86 of the float 8 receives buoyancy from the liquid 3. Therefore, the float 8 can receive a 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 elastic member 7 and the maximum outer diameter R of the float 8 can be set to substantially coincide with each other, and the recovery device 1 can be prevented from being enlarged in the height direction. It is done.

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 portion 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 stable, and the liquid level of the surface layer liquid 4 is hardly disturbed. For this reason, the recovery of the surface liquid 4 is suppressed by suppressing the diffusion of the machine oil and foreign matter, etc., brought close to the surface liquid suction port 83 and the separation from the surface liquid suction port 83. Can be secured.

It is conceivable that gas (air) together with the surface layer liquid 4 enters the expansion member 7 and comes into contact with 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 where the air that has entered the inside of the elastic member 7 together with the surface layer liquid 4 is retained. Even if there is gas that has entered the surface expansion liquid 7 together with the surface layer liquid 4, it hardly stays on the lower surface side of the inner overhanging portion 86. For this reason, the float 8 is not easily affected by gas and can stabilize its behavior.

The collection device 1 according to the present embodiment includes an expandable member 7 and a float 8. The elastic member 7 is formed in a cylindrical shape having an upper end portion 73 and a lower end portion 72. The float 8 is attached to the upper end portion 73 of the expansion / contraction member 7 substantially concentrically with the expansion / contraction member 7, and is configured to be able to ascend and descend by receiving buoyancy from the liquid 3 inside the liquid tank 2. The lower end portion 72 of the telescopic member 7 is attached to the upper surface of the bottom plate member 74 held at a predetermined height position inside the liquid tank 2. The stretchable member 7 is configured to be stretchable as the float 8 moves up and down. The float 8 includes a trunk portion 80. The body portion 80 includes an upper surface 81 and a lower surface 82. On the upper surface 81, a surface layer liquid inlet 83 for sucking the surface layer liquid 4 of the liquid 3 is formed. The body 80 includes a surface liquid passage 84. The trunk | drum 80 is formed in the cylinder shape. The body portion 80 communicates the inside of the surface layer liquid suction port portion 83 and the inside of the expansion / contraction member 7 and guides the surface layer liquid 4 sucked from the surface layer liquid suction port portion 83 to the inside of the expansion / contraction member 7. The body portion 80 further includes an outer overhang portion 85 and an inner overhang portion 86. The outer projecting portion 85 projects from the upper end portion 73 of the elastic member 7 toward the outer side of the elastic member 7. The inner projecting 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 expandable 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. For this reason, if the water level of the liquid 3 inside the liquid tank 2 reaches the outer overhanging portion 85 of the float 8, the float 8 receives buoyancy from the liquid 3, and the elastic member 7 that attaches the float 8 to the upper end portion 73. Expands. 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 recovery device 1 having the above-described configuration, the trunk portion 80 includes an outer overhanging portion 85 and an inner overhanging portion 86. The outer projecting portion 85 projects from the upper end portion of the elastic member 7 toward the outer side 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. Then, the trunk portion 80 receives buoyancy from both the outer overhanging portion 85 and the inner overhanging portion 86. Therefore, the buoyancy is received from the liquid 3 in a stable state as compared with the configuration in which the buoyancy is received only at the center side of the expansion / contraction member 7, so that the behavior of the expansion / contraction member 7 to which the float 8 is attached is stabilized. Disturbance 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. The lower surface 82 of the outer overhanging portion 85 and the inner overhanging portion 86 is flush. The lower surface 82 of the outer overhanging portion 85 and the inner overhanging portion 86 is formed on a flat surface that is orthogonal to the vertical direction of the central axis of the elastic member 7. According to this configuration, the float 8 can stably receive buoyancy from the liquid 3 on a horizontal flat surface.

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 small. 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 elastic member 7 is formed in a cylindrical shape from synthetic rubber. The elastic member 7 includes a plurality of peak portions 70 projecting radially outward from the cylindrical center, and a plurality of valley portions 71 located between the peak portions 70 and projecting from the peak portion 70 toward the cylindrical center. It is formed in a bellows shape. According to this configuration, the expansion / contraction length in the vertical direction of the expansion / contraction member 7 can be 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. Then, the trunk portion 80 receives buoyancy from both the outer overhanging portion 85 and the inner overhanging portion 86. For this reason, it is not necessary to increase the height of the float 8. Therefore, the outer diameter of the crest portion 70 of the elastic member 7 and the maximum outer diameter R of the float 8 can be set to approximately the same size, and the recovery device 1 can be prevented 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 recovery device 1 according to the present invention is not limited to the above 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 recovery 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 73 side and the lower end 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, the effect similar to embodiment demonstrated using FIG. 1 and FIG. 2 is show | played.

As an aspect of the recovery device 1 according to the present invention, as shown in FIG. It is possible to adopt the configuration as described 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 empty 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 device 1 having the configuration shown in FIG. 5, the same functions and effects as those of the embodiment described with reference to FIGS. 3 and 4 can be obtained.

In each of the above-described embodiments, the case where the valley portion 71 which 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 body 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 includes an extension part 12 and an upright part 13. The extension portion 12 extends radially outward along the lower surface of the trunk portion 80 from the trough portion 71 corresponding to the middle portion of the lower surface of the trunk portion 80 of the float 8 in the radial direction. The upright portion 13 is raised from the radially outer end portion of the extension portion 12 along the outer peripheral surface of the trunk portion 80 (outside protruding portion 85).

The extension part 12 and the upright part 13 are formed integrally with the body part 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. 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. 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 above embodiments, the ratio of the overhang amount of 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. That is, when the relationship is 0.3 to 0.8: 1.0, the behavior of the float 8 is stabilized. 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 substantially match. That is, the maximum diameter R of the float 8 may be set larger or smaller than the outer diameter of the peak portion 70 of the elastic member 7.

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 the above embodiments, the elastic member 7 has been described as being cylindrical. The float 8 has been described in the case of a cylindrical shape (annular shape) corresponding to the shape of the elastic member 7. However, the expansion / contraction member 7 may have a rectangular tube shape. The float 8 may have a rectangular tube shape (angular ring shape) according to the shape of the elastic member 7. The elastic member 7 may be formed in a simple cylindrical shape made of synthetic rubber, for example, instead of the 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. The inclination angle of the conical surface may be 10 °, for example. The inclination angle of the conical surface may be an inclination (greater inclination) steeper 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

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 Prepared,
The lower end portion of the elastic member is attached to the upper surface of a 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. A surface layer liquid passage that communicates the inside of the liquid suction port portion and the expansion / contraction member is formed in a cylindrical shape, and the surface layer liquid passage guides the surface layer liquid sucked from the surface layer liquid suction port portion to the inside of the expansion / contraction member. Configured and
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 / lowers 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 A surface layer liquid recovery device, characterized in that the surface layer liquid recovery device is formed on a flat surface perpendicular to the vertical direction of the central axis of the elastic member.
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.
The amount of overhang from the upper end of the expansion / contraction member at the outer overhanging portion and the inner overhanging portion is set so that the outer overhanging portion is smaller than the inner overhanging portion. The surface layer liquid collection | recovery apparatus of description.
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 3, wherein the surface layer liquid recovery device is formed in a bellows shape including a valley portion.
5. The surface liquid recovery apparatus according to claim 4, wherein the outer diameter of the crest of the elastic member and the maximum outer diameter of the float are set to substantially coincide with each other.
The upper surface part of an expansion-contraction member is a trough part, The surface layer liquid collection | recovery apparatus of Claim 4 or Claim 5 in which the lower surface of the float is attached to the trough part.
The surface liquid recovery apparatus according to any one of claims 4 to 6, wherein the elastic member has different thicknesses of the synthetic rubber on the upper end side and the lower end side.
The drainage pipe for discharging | emitting the surface layer liquid inside an expansion-contraction member to the exterior of an expansion-contraction member is penetrated by the surface-layer liquid suction inlet part and a surface layer liquid channel | path. Surface liquid recovery device.
The surface layer liquid recovery apparatus according to any one of claims 1 to 7, 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.
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 Prepared,
The lower end portion of the elastic member is attached to the upper surface of a 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. A surface layer liquid passage that communicates the inside of the liquid suction port portion and the expansion / contraction member is formed in a cylindrical shape, and the surface layer liquid passage guides the surface layer liquid sucked from the surface layer liquid suction port portion to the inside of the expansion / contraction member. Configured and
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 / lowers 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,
A surface layer liquid recovery apparatus characterized in that the lower surface of the inner overhanging portion of the body portion is formed on an inclined surface positioned higher toward the central axis side of the elastic member.
The surface liquid recovery apparatus according to claim 10, wherein the upper surface and the lower surface of the body portion are formed in an annular shape.