JP3535191B2 - Suction type recovery method and device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction type recovery method and apparatus using a decompression device such as a vacuum pump and an exhaust blower. It is intended to collect solid-liquid mixtures with low water content, such as drainage and earth from pump sedimentation basins. 2. Description of the Related Art Conventionally, the technical idea of using a pressure reducing device such as a vacuum pump or an exhaust blower for recovering a solid-liquid mixture has been known. As typified by a vacuum vehicle, a system in which the drive of the pressure reducing device is stopped when the inside of the collection tank is full, and the tank hatch is opened to take out the collected material has become mainstream. However, in this method, it is not possible to continuously suck the collected material, and it is necessary to perform an artificial operation when the collected material is discharged. At the time of resuming work, there is often a case where a line is blocked. [0004] As means for solving such a disadvantage, FIG.
As shown in FIGS. 1 to 14, the recovery tank 2 'is divided into two upper and lower chambers, the upper chamber being a first storage chamber 2'a, the lower chamber being a second storage chamber 2'b, and the lower bottom of both chambers. Are equipped with normally-closed hatches 12'a and 12'b, respectively.
A communication pipe 14 'connects between the 2'b and a first valve 17'a for opening and closing the communication between the two chambers, and the inside of the second storage chamber 2'b is connected to the outside air. Conduction path 1 with
A method has been proposed in which a suction-type collection device provided with a second valve 17'b that opens and closes 5 'intermittently discharges the collection while continuing the suction operation. [0005] The upper chamber hatch 12'a and the lower chamber hatch 12'b in this apparatus are both kept lightly closed while the pressure reducing device is not driven. That is, the upper chamber hatch 12'a is closed when the pressure in the first storage chamber 2'a is negative and the pressure in the second storage chamber 2'b is positive, and the upper chamber hatch 12'a is closed. When the inside of the storage chamber 'b becomes a negative pressure state like the inside of the first storage chamber 2'a, the storage chamber is opened by the weight of the storage material. It is opened only after receiving the weight of the stored material, and cannot be opened only when the pressure in both chambers 2'a and 2'b is balanced. Also, the lower chamber hatch 12'b is closed when the inside of the second storage chamber 2'b becomes a negative pressure like the inside of the first storage chamber 2'a, and the inside of the second storage chamber 2'b becomes positive pressure. When it does, it is released by the weight of the stored material. This hatch 1
The second storage chamber 2'b is also opened only after receiving the weight of the storage material, and cannot be opened only when the inside of the second storage chamber 2'b is balanced with the atmospheric pressure. When the pressure reducing device is driven in a state where the first valve 17'a is closed and the second valve 17'b is opened, a negative pressure is generated in the first storage chamber 2'a. Due to the pressure difference between the second storage chamber 2'b and the upper chamber hatch 12 '
a is sucked upward to be in a sealed state, and a system capable of withstanding the load of the stored material is established. Then, as shown in FIG. 12, the recovered material flowing through the suction pipe 5 'is stored in the first storage chamber 2'a having a negative pressure, and the stored amount has reached a predetermined value. At this point, the second valve 17'b is closed and the first valve
When the valve 17'a is opened, the pressure in the second storage chamber 2'b also becomes negative through the communication pipe 14 ', and the lower chamber hatch 12'b is closed by the pressure difference with the outside air. ′
a, and the pressure difference between the second storage chamber 2′b and the upper chamber hatch 12′a loses the hermeticity, so that the first storage chamber 2′a
As shown in FIG. 13, the storage material in the second storage chamber 2 'is opened while the upper chamber hatch 12'a is opened downward by its weight.
Drops into b. Next, if the first valve 17'a is closed and the second valve 17'b is opened, the inside of the second storage chamber 2'b communicates with the outside air via the conduction path 15 ', so that the pressure becomes positive. However, since the inside of the first storage chamber 2'a is kept in a negative pressure state, the stored material in the second storage chamber 2'b opens the lower chamber hatch 12'b by its weight, as shown in FIG. It will be discharged outside. However, the recovery apparatus shown in FIGS. 11 to 14 has a serious defect in practical use. That is, in the state of FIG. 13, the gas in the first storage chamber 2'a is directly sucked by the suction pipe 8 ', but the second storage chamber 2'b
The gas inside is sucked by the suction pipe 8 'via the communication pipe 14' and the first storage chamber 2'a, so that the pressure loss is large. Therefore, the pressure in the second storage chamber 2'b is reduced to the first storage chamber 2 '. ′ A, which is slightly higher than the pressure in the upper chamber hatch 12′a, which does not satisfy the conditions suitable for opening the upper chamber hatch 12′a. Since it is a normally closed type that is opened, there is no problem if the collected material is large in specific gravity or good in flowability, but it contains low specific gravity or amorphous solid with poor fluidity. If the solid-liquid mixture is used, it cannot be smoothly moved into the second storage chamber 2'b. In addition, the fact that a large pressure loss occurs in the suction of gas from the second storage chamber 2'b means that the lower chamber hatch 12 '
b also weakens the sealing force of the second storage chamber 2 '.
The stored matter in b leaks out before reaching the predetermined amount, and the reliability of the quantitative intermittent discharge operation is impaired. Further, since the solid-liquid mixture recovered by the conventional suction / discharge device is discharged at the same concentration, there is the inconvenience that the post-treatment must be separately performed by a solid-liquid separation device. SUMMARY OF THE INVENTION It is an object of the present invention to ensure that the continuous suction of the collected material and the intermittent discharge operation of the fixed amount are reliably performed, and that the recovered solid-liquid mixture is converted into a solid having a low water content in the recovery tank. An object of the present invention is to provide a suction-type recovery method and a device capable of discharging the same. In the suction type recovery method according to the present invention, the suction pipe led out of the flow chamber is opened toward the supply source of the solid-liquid mixture, and the pressure is reduced from the flow chamber through the liquid recovery tank. A first decompression line leading to the device is opened to make the distribution chamber a negative pressure, and a second decompression line leading from the storage chamber to the decompression device through the liquid recovery tank is opened to create a negative pressure in the storage room. By doing so, the first normally-open lip valve mounted to communicate from the lower bottom of the flow chamber into the storage chamber is held open by its own elasticity, and is mounted to communicate from the lower bottom of the storage chamber to the atmosphere. The second normally-open type lip valve is closed by a differential pressure from the atmospheric pressure, and the solid-liquid mixture sucked from the suction pipe by the differential pressure from the atmospheric pressure is stored from an opening surface of the first normally-open type lip valve. Allow the air to flow down into the room, leaving a small air pocket in the upper part. After the storage chamber is almost full, only the solids in the solid-liquid mixture remaining in the distribution chamber are allowed to flow down into the storage chamber using the specific gravity difference between the solids and liquids. A volume of liquid is raised from the storage chamber into the distribution chamber, and the second decompression line is closed while the negative pressure state in the distribution chamber is maintained without interrupting the operation of the decompression device, and the negative pressure is released from the storage chamber to the negative pressure release means. By opening the communicating pressure increasing passage to make the storage chamber a positive pressure, the first normally open lip valve is closed by the differential pressure between the two chambers, and the second normally open lip valve is opened by its own elasticity. The lip valve is returned and the solid-liquid mixture having a low water content in the storage chamber is discharged to the outside from the opening surface of the second normally-open lip valve. Further, in the suction type recovery device according to the present invention,
In a suction-type recovery device that draws a solid-liquid mixture into a recovery tank through a suction pipe by driving a decompression device, a recovery tank has a two-chamber structure, an upper chamber is formed as a flow chamber, and a lower chamber is formed as a storage chamber. And a suction pipe for opening toward the supply source of the solid-liquid mixture is drawn out of the flow chamber, the flow chamber and the liquid collection tank are connected to each other by the first suction pipe, and the suction side of the pressure reducing device is connected to the liquid. A first pressure-reducing pipe line by conducting to the liquid collecting tank, the reservoir and the liquid collecting tank are connected by the second suction pipe, and the suction side of the pressure reducing device is connected to the liquid collecting tank by the second collecting pipe. 2, a pressure-intensifying path for connecting the storage chamber to the negative pressure releasing means is opened, the pressure-increasing path is closed when the second pressure-reducing pipe is opened, and the pressure-increasing path is opened when the pressure-increasing path is opened. 2 Equipped with a valve mechanism for closing the decompression line, At the bottom, when the distribution chamber and the storage chamber are in a negative pressure state, they maintain the open state by their own elasticity, and when the pressure in the storage chamber becomes higher than the pressure in the distribution chamber, the closed state is established by the differential pressure. A first normally-open lip valve is provided, and the lower bottom portion of the storage chamber is closed by a pressure difference from the atmospheric pressure when the circulation chamber and the storage chamber are in a negative pressure state, and the storage chamber is closed. A second normally-open lip valve which is restored to an open state by its own elasticity when the pressure becomes positive is attached, and a solid-liquid mixture is provided with a space for forming a small air reservoir in the upper part of the storage chamber. It is configured to regulate the upper limit of accommodation. Embodiments will be described below with reference to the drawings of the embodiments. 1 to 4, reference numeral 1 denotes a pressure reducing device using a water ring type vacuum pump or an exhaust blower, and 2 denotes a recovery tank which is made to have a negative pressure by the operation of the pressure reducing device 1. And two lower chambers 2a and 2b. Each of the lower chambers 2a and 2b has a funnel-shaped inclined surface 3a and 3b, respectively, and has a rectangular hole at the bottom. 4 and 4 are established respectively.
Reference numeral 5 denotes a suction pipe led down from the flow chamber 2a, and the leading end 5e of the suction pipe opens toward the supply source 6 of the solid-liquid mixture. 5 v is an open / close valve attached to the suction pipe 5, 7 is a first decompression pipe line configured by connecting the upper part of the flow chamber 2 a and the suction side 1 a of the decompression device 1 by the first suction pipe 8, 9
Is a liquid recovery tank interposed between the suction side 1a of the pressure reducing device 1 and the first suction pipe 8, 10 is a flow control valve attached to the first suction pipe 8, and 11 is above the wall surface of the storage chamber 2b. Pores opened in the upper portion than the open lower edge portion 12e of the first normally open lip valve 12a described below,
11s is a solid-liquid separation screen attached to the pore 11;
Reference numeral 3 denotes a second decompression pipe formed by connecting the pores 11 and the suction side 1a of the decompression device 1 with a second suction pipe 14, and the second decompression pipe line includes the suction side 1a of the decompression device 1 and the second suction pipe 14. A liquid component recovery tank 9 is interposed between the tanks. Reference numeral 15 denotes a pressure-increasing passage which is led out of the second suction pipe 14 in a branched manner and is conducted to some negative pressure releasing means 16.
And a valve mechanism for opening and closing the storage chamber 2b to and from the negative pressure releasing means 16 when the valve is closed. For example, when the second pressure reducing pipe 13 is closed, Open to the inside or the air line 18
A positive pressure is supplied into the storage chamber 2b by opening the exhaust side 1b of the decompression device 1 through the air passage, or by opening a separate air supply device (not shown), or the like. The pressure increasing path 15 is also closed together with the closing. Therefore, the valve mechanism 17 opens the storage chamber 2b with either the second pressure reducing pipe 13 or the pressure increasing path 15, and when the storage chamber 2b opens with the second pressure reducing pipe 13, the storage chamber 2b is opened.
And the pressure increasing passage 15 is disconnected, and the storage chamber 2b is connected to the pressure increasing passage 1
5, the opening and closing operation is performed so that the opening between the storage chamber 2b and the second pressure reducing conduit 13 is cut off. However, if necessary, the storage chamber 2b may be closed with both the second pressure reducing pipe 13 and the pressure increasing path 15. In the drawings of the embodiment, the branch point between the second pressure reducing line 13 and the pressure increasing line 15 is
In this embodiment, three three-way switching valves are interposed to open and close the second pressure reducing pipe 13 and open and close the pressure increasing path 15, but the three switching valves are used. (2) The opening and closing of the pressure reducing line 13 and the opening and closing of the pressure increasing passage 15 may be performed by separate switching valves. Thus, when the pressure reducing device 1 is operated, the pressure conversion mechanism having both the function of reducing the pressure in the storage chamber 2b to the same pressure as the pressure in the flow chamber 2a and the function of raising the pressure to the same pressure as the atmospheric pressure is provided. It is composed. The first normally-open lip valve 12a, which is mounted so as to communicate from the lower bottom of the flow chamber 2a into the storage chamber 2b, operates when the flow chamber 2a and the storage chamber 2b are in a negative pressure state. When the open state is maintained by the elasticity and the pressure in the storage chamber 2b becomes higher than the pressure in the flow chamber 2a, the closed state is established by the differential pressure. The second normally-open lip valve 12b mounted to communicate with the atmosphere from the lower bottom of the storage chamber 2b is connected to the atmospheric pressure when the flow chamber 2a and the storage chamber 2b are in a negative pressure state. When the closed state is established by the differential pressure and the pressure in the storage chamber 2b becomes positive, the state is restored to the open state by its own elasticity. These two lip valves 1
FIGS. 5 and 6 show specific structural examples of 2a and 12b.
A fastening plate 19 is provided around the upper edge of the square tubular valve element as seen in FIG.
To form an attachment portion, and is attached to the edge of the rectangular hole 3 via a valve seat 12f as shown in FIGS.
And a rotating wall 2 facing the front and rear below the mounting portion.
0 and 20, reinforcing plates 21 and 21 and a roll-up preventing material 21s,
21s to provide rigidity to the rotating walls 20, 2
The flexing and extending walls 22, 22 connected to the side end of the elastic member 0 have flexibility, and the lower edges of the rotating walls 20, 20 are formed on the depressing and separating surfaces 23, 23, respectively, so that external pressure can be reduced. Bending wall 2 by action
The rectangular holes 4 are closed by the bending walls 2 and 22 being bent and the rotating walls 20 and 20 rotating in the direction of approach to each other to close the separating and contacting surfaces 23 and 23. When the external pressure is released, the bending / extending walls 22, 22 are extended, and the turning walls 20, 20 are turned in the separating direction to separate the contact surfaces 23, 23, so that the rectangular hole 4 is opened. You. Referring again to FIGS. 1 to 4, reference numeral 24 denotes a sand sensor for detecting the state of solids accumulation in the storage chamber 2b, and reference numeral 25 denotes a solid-liquid separation screen provided in the flow chamber 2a. The support member 26 fixed above the suction pipe inlet 5h on the inner surface of the peripheral wall of the chamber 2a has a mode in which the support member 26 is laterally installed in a loose fit state and can be vertically shaken. Reference numeral 27 denotes a submersible pump installed in the liquid collection tank 9, reference numeral 28 denotes a liquid return pipe derived from a discharge port of the submersible pump 27, and a leading end portion 28 e of which is provided in the supply source 6 of the solid-liquid mixture. Is introduced into the lower part of the opening. In addition,
The first normally-open lip valve 12a, which is mounted in the rectangular hole 4 at the bottom of the flow chamber 2a and guided into the storage tank 2b, not only serves as a flow path for the collected material when opened, but also as a storage path as described later. It also serves as a liquid rise path from inside the chamber 2b, and its open lower edge 12e needs to reach below the opening position of the pore 11. When the pressure reducing device 1 is not driven, the pressure in the circulation chamber 2a and the pressure in the storage chamber 2b are balanced and equal to the atmospheric pressure, so that the first pressure as shown in FIG. The normally open lip valve 12a and the second normally open lip valve 12b are both kept open. The pressure reducing device 1 is driven by the pipe configuration shown in FIG. 1 with the leading end 5 e of the suction pipe 5 directed toward the solid-liquid mixture supply source 6, and the first pressure reducing pipe 7 is operated by the operation of the valve mechanism 17. When the second pressure reducing pipe 13 is opened and the pressure increasing path 15 is closed, the outside air is sucked from the bottom rectangular hole 4 of the storage chamber 2b which is in contact with the atmospheric pressure, and the suction action is performed as shown in FIG. As shown, the second normally-open lip valve 12b is closed, and by continuing to drive the pressure reducing device 1, the inside of the flow chamber 2a is bled via the first pressure reducing line 7, and the inside of the storage chamber 2b is subjected to the second pressure reduction. Since the air is extracted through the pipe 7 and both chambers 2a and 2b have a negative pressure, the solid-liquid mixture pumped up with some air from the suction pipe 5 has a funnel-shaped inclined surface 3a in the flow chamber 2a. Flows down and is stored in the storage chamber 2b from the open rectangular hole 4 at this time. The pressure in the second lower lip valve 12b acts on the second normally-open type lip valve 12b, and the lower bottom rectangular hole 4 is firmly closed, so that the pressure in the storage chamber 2b is reduced. The outflow of the liquid mixture is prevented and the airtightness is maintained. In the embodiment of the present invention, the pressure ratio between the two chambers 2a and 2b in the state shown in FIG. 2 is completely the same by completely equalizing the pipe resistance of the first pressure reducing pipe 7 and the second pressure reducing pipe 13. When the negative pressure is advanced to some extent without forming a complete vacuum state, the first normally-open lip valve 1
2a opens 100%. Also, for example, the first suction pipe 8
The pipe resistance of the first pressure reducing pipe 7 is made slightly larger than the pipe resistance of the second pressure reducing pipe 13 by reducing the pipe diameter, increasing the pipe length, or operating the flow control valve 10. In this case, the degree of negative pressure in the storage chamber 2b is slightly larger than the degree of negative pressure in the flow chamber 2a, so that the opening operation of the first normally-open lip valve 12a is performed more reliably and the second
The closing operation of the normally-open lip valve 12b can be ensured. During the operation of the pressure reducing device 1, the solid-liquid mixture is continuously fed through the suction pipe 5, and the storage amount of the solid-liquid mixture flowing down from the flow chamber 2a to the storage chamber 2b gradually increases.
Rises to the open lower edge 12 e by remote above the first normally open lip valve 12a, elevated while forming a slight air reservoir 29 to the upper periphery of the O cormorants savings reservoir 2b shown in FIG. 3 is regulated And
Above that, the liquid component cannot flow down into the storage chamber 2b and remains in the flow chamber 2a, and only solids having a large specific gravity flow down to further push up the liquid surface in the storage chamber 2b. Since the effect is suppressed by the air reservoir 29 formed in a liquid surface form, the liquid in the storage chamber 2b is conversely moved back to the open rectangular hole 4 to the circulation chamber 2a. Due to such a solid-liquid exchange action, solids having a low water content gradually accumulate in the storage chamber 2b with the passage of time. When a predetermined time has elapsed since the second normally-open lip valve 12b was closed, the second pressure reducing line 13 was closed by the switching operation of the valve mechanism 17, and the pressure increasing line 1 was turned on.
5 is opened to release the negative pressure state in the storage chamber 2b, so that the first normally open lip valve 12a as shown in FIG.
Is closed and the second normally-open lip valve 12b returns to the open state, and solids having a low water content in the storage chamber 2b are discharged from the rectangular holes 4 to the outside. During this time, the inside of the flow chamber 2a is maintained in a negative pressure state, and the solid-liquid mixture is continuously fed from the suction pipe 5. Negative pressure release means 1 in storage chamber 2b
6, the second pressure reducing passage 13 is closed and the pressure increasing passage 15
Is opened to the atmosphere to equilibrate the inside of the storage chamber 2b with the atmospheric pressure, and the pressure increase path 15 is opened to the exhaust side 1b of the pressure reducing device 1 or to a separate air supply device to open the storage chamber 2b. Can be set to a pressure higher than the atmospheric pressure. By adopting the latter method, the opening operation of the second normally-open type lip valve 12b can be performed more reliably and the first normally-open type lip valve 12a can be closed. The condition can be strengthened. When the solid-liquid mixture stored in the storage chamber 2b is discharged as described above, the switching operation of the valve mechanism 17 causes the second pressure reducing pipe 13 to be in the open state, and the pressure increasing path 15 to be in the closed state. As a result, the inside of the storage chamber 2b is in a negative pressure state, so that the second normally-open lip valve 12b closes and the first normally-open lip valve 12a returns to the open state, as shown in FIG. The solid-liquid mixture discharged from the pipe 5 flows down along the funnel-shaped inclined surface 3a in the flow chamber 2a and is stored in the storage chamber 2b from the open rectangular hole 4. And the first normally open lip valve 1
The closing operation of the 2a and the second normally-open type lip valve 12b is performed in such a manner that the depressing and separating surfaces 23, 23 are brought into surface contact with each other and closed, so that foreign matters such as sand particles are closed on the closing surface. Even if it is bitten, the foreign matter is wrapped between the depressing and separating surfaces 23, 23, and the airtightness of the closing surface is maintained. The switching operation of the valve mechanism 17 is performed as follows.
The operation may be automatically performed at predetermined time intervals by setting a timer, or may be electrically performed based on a detection signal obtained by detecting a solid deposition state using a sand sensor 24 or the like. By the repetition of the alternate opening and closing operation of the first normally open lip valve 12a and the second normally open lip valve 12b accompanying the switching operation of the valve mechanism 17, solid-liquid mixing continuously sucked through the suction pipe 5 is performed. An operation of intermittently discharging the body as a solid having a low water content from the storage chamber 2b is performed. The liquid content in the flow chamber 2a is further removed by a solid-liquid separation screen 25, and the liquid recovery tank 9
The screen 25 has a large cross-sectional area of water flow and a low flow velocity. Also, the screen 25 is loosely fitted by the support member 26 and slightly vibrates up and down. There is no. In the process of sucking and discharging the collected material, the liquid mixed during the ventilation from the collection tank 2 to the liquid collection tank 9 is collected into the liquid collection tank 9 and returned by the operation of the submersible pump 27. The liquid is reduced into the original supply source 6 through the pipe 28. However, when the liquid component flows out from the leading end 28e, a mixing and stirring action occurs in the supply source 6 to solidify the liquid from the suction pipe distal end 5e. It makes it easy to inhale the minute. According to the present invention, the continuous suction and quantitative intermittent discharge operation of the collected material are reliably performed, and the collected solid-liquid mixture is discharged as a solid having a low water content in the collection tank. Therefore, there is an advantage that a separate post-treatment by a solid-liquid separation device becomes unnecessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an operation mode in the device of the present invention, showing a state when a pressure reducing device is not driven. FIG. 2 is an explanatory view of an operation mode in the apparatus of the present invention, and shows a state in which a solid-liquid mixture discharged by a suction pipe flows down into a storage chamber along a funnel-shaped inclined surface in a flow chamber. FIG. 3 is an explanatory view of an operation mode in the device of the present invention, showing a state where a solid-liquid mixture is stored in a storage chamber and an air reservoir is formed above the storage chamber. FIG. 4 is an explanatory view of an operation mode in the device of the present invention, showing a state where solids accumulated in a storage chamber are discharged from a lower bottom portion. FIG. 5 is a perspective view of a normally-open lip valve mounted on the device of the present invention in an open state. FIG. 6 is a vertical side view of the normally open lip valve mounted on the apparatus of the present invention in an open state. FIG. 7 is a perspective view of a valve seat for mounting a normally open lip valve in the device of the present invention. FIG. 8 is a vertical sectional side view of a valve seat for mounting a normally open lip valve in the device of the present invention. FIG. 9 is a side view of the normally open lip valve mounted on the apparatus of the present invention in an open state. FIG. 10 is a side view of the normally-open lip valve mounted on the device of the present invention in a closed state. FIG. 11 is an explanatory view of an operation mode of the conventional device, and shows a state when the pressure reducing device is not driven. FIG. 12 is an explanatory view of an operation mode in the conventional device, and shows a state in which a recovered material pumped up by a suction pipe is stored in a first storage chamber. FIG. 13 is an explanatory view of an operation mode in the conventional device, and shows a state in which the stored matter in the first storage chamber falls into the second storage chamber while opening the upper chamber hatch downwardly by its weight. FIG. 14 is an explanatory view of an operation mode of the conventional device, and shows a state in which the stored material in the second storage chamber is discharged to the outside while opening the lower chamber hatch downwardly by its weight. [Description of Signs] 1 Decompression device 1a Suction side 2 Recovery tank 2a Distribution chamber 2b Storage chamber 5 Suction pipe 6 Solid-liquid mixture supply source 7 First decompression pipe line 8 First suction pipe 9 Liquid collection tank 12a 1st normally open type lip valve 12b 2nd normally open type lip valve 13 2nd decompression pipe line 14 2nd suction pipe 15 booster path 16 negative pressure release means 17 valve mechanism 29 air pool

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-50292 (JP, A) JP-A-6-50296 (JP, A) JP-A-3-230000 (JP, A) 183702 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04F 1 / 02,1 / 06 F04F 3/00

Claims (1)

(57) Claims 1. A suction pipe (5) led out from the flow chamber (2a) is opened toward a solid-liquid mixture supply source (6),
A first decompression line (7) from the flow chamber (2a) to the decompression device (1) through the liquid recovery tank (9) is opened to make the inside of the flow chamber (2a) a negative pressure, and the storage chamber ( By opening a second decompression pipe (13) from the liquid decompression device (1) to the decompression device (1) through the liquid recovery tank (9) to make the inside of the storage chamber (2b) a negative pressure, the flow chamber (2a) is opened. ) From the bottom of the storage chamber (2
b) The first normally open lip valve (12a) mounted to communicate with the inside is held open by its own elasticity, and the second normally mounted lip valve (12a) is mounted to communicate from the lower bottom of the storage chamber (2b) to the atmosphere. The normally open lip valve (12b) is closed by a differential pressure from the atmospheric pressure, and the solid-liquid mixture sucked from the suction pipe (5) by the differential pressure from the atmospheric pressure is supplied to the first normally open lip valve (12a). reservoir from the opening surface of) (passed down into 2b) within reservoir leaving some air pockets (29) in the upper part (after 2b) in becomes nearly full state flow chamber (2a)
Instead of letting only the solids in the solid-liquid mixture remaining inside the solid-liquid mixture flow down into the storage chamber (2b) by utilizing the specific gravity difference between the solids and liquids, a liquid having the same volume as that of the solids is stored in the storage chamber. (2b) is raised into the flow chamber (2a), and the second pressure reducing pipe (13) is closed while maintaining the negative pressure state in the flow chamber (2a) without interrupting the operation of the pressure reducing device (1). And the storage room (2
Pressure intensifier (15) leading from b) to negative pressure release means (16)
Is opened to make the inside of the storage chamber (2b) a positive pressure, so that the first normally open lip valve (12a) is connected to the two chambers (2a).
(2b) and the second normally-open lip valve (12b) is opened and returned by its own elasticity, and the solid-liquid mixture having a low water content in the storage chamber (2b) is closed by a second pressure. A suction type recovery method comprising discharging the normally open lip valve (12b) to the outside through an opening surface thereof.