JP2011202409A - Suction recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a backflow phenomenon, in which liquid or solid contents of stored object stored inside a storage tank are mixed into the air and suctioned into a negative pressure generating device.SOLUTION: A suction recovery device includes the storage tank 1 storing objects like suctioned sludge, an intake pipe 2 an end of which is inserted into the storage tank 1, a communicating valve part 3 arranged on the upper part of the storage tank 1, and a vacuum pump 5 connected to the communicating valve part 3 by the intermediary of a suction pipe 4. The communicating valve part 3 includes: a swirling flow generating part 11 having a ring-shaped space 10 generating swirling flow of the air; a centrifugation part 12 extending downward from the swirling flow generating part 11; an air introduction part 13 introducing the air to the swirling flow generating part 11; an exhaust air space 14 formed on the inner-diameter side of the swirling flow generating part 11; a valve body 15 which can block the communication between the exhaust air space 14 and an inner space of the storage tank 1; and an air discharging part 16 an end of which is inserted into the exhaust air space 14 and the other end of which is connected to the suction pipe 4. An air introduction port 13a of the air introduction part 13 and a lower end opening 12a of the centrifugation part 12 are positioned inside the storage tank 1.

Description

  The present invention relates to a suction recovery apparatus that sucks and collects industrial waste such as sewage, sludge, sedimentation, earth and sand, scale, waste liquid, dust, and dust, and other fluid objects in a storage tank. Many of these types of suction collection devices are mounted on vehicles, and vehicles equipped with suction collection devices are generally called suction vehicles.

  This type of suction recovery device is mainly composed of a storage tank, a suction pipe having one end inserted in the storage tank, and a negative pressure generator for generating a negative pressure in the storage tank (the following patents) Literatures 1-3). A communication valve portion having a float is provided in the upper part of the storage tank, and this communication valve portion is connected to the negative pressure generator via a suction pipe. 5-7 has shown the conventional storage tank 31 provided with such a communication valve part 30. FIG.

  As shown in FIG. 5, one end of the suction pipe 32 is inserted into the storage tank 31 obliquely upward from a lateral lower portion of the storage tank 31. The communication valve unit 30 includes an exhaust space 33 located outside the storage tank 31, a gas discharge unit 35 having one end inserted into the exhaust space 33 and the other end connected to the suction pipe 34, and the exhaust space 33. And a valve body 36 capable of blocking communication between the internal space of the storage tank 31, and the valve body 36 includes a valve seat portion 36 a provided at a lower end portion of the exhaust space portion 33, and a valve seat portion 36 a. A float 36c that can close the valve hole 36b, and a support 36d that supports the float 36c so as to be movable up and down. The support 36d is composed of a plurality of support rods and does not hinder ventilation. In addition, a drop prevention part 36e for preventing the float 36c from dropping is provided below the support 36d.

  When the negative pressure generator 37 is activated, the gas (air) in the storage tank 31 is sucked through the suction pipe 34 and the communication valve unit 30, and negative pressure is generated in the storage tank 31. When a suction cock (not shown) connected to the suction pipe 32 is opened, the object is sucked by the negative pressure acting on the suction pipe 32 from the inside of the storage tank 31, and the inside of the storage tank 31 is drawn from one end of the suction pipe 32. To erupt. The object ejected into the storage tank 31 collides with a baffle plate 38 installed above the inclination direction of the suction pipe 32 to reduce the flow velocity, and the liquid and solid contents in the gas having a large specific gravity fall and the storage tank It collects in 31. The gas from which the liquid and solid components have been separated in this way enters the exhaust space portion 33 through the communication valve portion 30 and is exhausted from the exhaust space portion 33 to the suction pipe 34 through the gas discharge portion 35. After the interface (liquid level) Ga of the storage G in the storage tank 31 rises to the lower end position of the float 36c, the float 36c of the communication valve unit 30 rises as the interface Ga rises. When it is full, it sits on the valve seat 36a and closes the valve hole 36b. As a result, the liquid or solid content in the stored matter G in the storage tank 31 is prevented from flowing into the exhaust space 33.

JP 2006-96509 A JP 58-95033 A JP 58-138841 A

  As shown in FIGS. 6 and 7, when the volume of the storage G in the storage tank 31 increases and the interface Ga rises, the liquid and solids in the vicinity of the interface Ga of the storage G pass through the valve body 36. In this case, the gas is drawn into the flow of the gas flowing into the exhaust space 33 and is sucked into the negative pressure generator 37 through the suction pipe 34 together with the gas (hereinafter, this phenomenon is referred to as “back flow phenomenon”). That said.) This reverse flow phenomenon is more likely to occur as the interface Ga of the reservoir G increases, and when a liquid or solid content mixed in the gas is sucked into the negative pressure generator 37 via the suction pipe 34, the negative pressure is increased. It may cause damage to the generator 37, a decrease in durability, and contamination of the surrounding environment.

  In view of the above problems, an object of the present invention is to prevent a reverse flow phenomenon in which liquid or solid content of a stored matter in a storage tank is mixed into a gas and sucked into a negative pressure generator.

  In order to solve the above-described problems, the present invention provides a storage tank for storing a sucked object, a suction pipe having one end inserted in the storage tank, a communication valve portion provided at an upper portion of the storage tank, and a communication In the suction recovery device including a negative pressure generating device connected to the valve portion via a suction pipe, the communication valve portion includes a swirling flow generating portion having an annular space for generating a swirling flow of gas, and a swirling flow generating portion A centrifugal separation part extending downward from the gas, a gas introduction part for introducing gas into the swirl flow generation part, an exhaust space part formed on the inner diameter side of the swirl flow generation part, an exhaust space part and an internal space of the storage tank, A valve body capable of interrupting communication between the two, and a gas discharge portion having one end inserted into the exhaust space portion and the other end connected to the suction pipe, and the gas introduction port of the gas introduction portion is located inside the storage tank The swirl flow is generated through the gas introduction part Together are introduced into and positioned inside the lower end opening is the storage tank of the centrifuge section, isolates separated from the gas by the centrifugal separation unit provides a structure that is returned from the lower end opening in the interior of the storage tank.

  In the above configuration, the valve body includes a valve seat portion provided at a lower end portion of the exhaust space portion, a float capable of closing the valve hole of the valve seat portion, and a support body that supports the float so as to be movable up and down. Can be.

  ADVANTAGE OF THE INVENTION According to this invention, the backflow phenomenon by which the liquid content and solid content of the stored matter in a storage tank mix in gas, and it is attracted | sucked to a negative pressure generator can be prevented effectively.

It is sectional drawing which shows the suction collection | recovery apparatus which concerns on embodiment. It is a figure which shows a communicating valve part, Fig.2 (a) is a top view, FIG.2 (b) and (c) are side views. It is sectional drawing which shows the suction collection | recovery apparatus which concerns on embodiment. It is sectional drawing which shows the suction collection | recovery apparatus which concerns on embodiment. It is sectional drawing which shows the conventional suction collection device. It is sectional drawing which shows the conventional suction collection device. It is sectional drawing which shows the conventional suction collection device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a suction recovery apparatus according to this embodiment. The suction recovery apparatus of this embodiment is mounted on a vehicle body of a suction wheel (not shown) so as to be tiltable, and has a storage tank 1 for storing a sucked sludge and other objects, and one end inserted in the storage tank 1. The suction pipe 2, the communication valve part 3 provided in the upper part of the storage tank 1, and the negative pressure generator connected to the communication valve part 3 via the suction pipe 4, for example, the vacuum pump 5, are provided. The storage tank 1 is mounted on the rear part of the vehicle body, and devices and devices such as a separator, a draining device, a valve, and instruments are disposed in addition to the vacuum pump 5 between the storage tank 1 and a driver seat in front of the vehicle body. Yes.

  One end of the suction pipe 2 is inserted into the storage tank obliquely upward from a lower side portion of the storage tank 1, and a baffle plate 6 is installed above the suction pipe 2 in the inclination direction.

  As shown in FIG. 2, the communication valve unit 3 includes a swirl flow generator 11 having an annular space 10 that generates a swirl flow of gas, a centrifugal separator 12 that extends downward from the swirl flow generator 11, and a swirl flow The gas introduction part 13 for introducing gas into the generation part 11, the exhaust space part 14 formed on the inner diameter side of the swirl flow generation part 11, and the communication between the exhaust space part 14 and the internal space of the storage tank 1 are blocked. A possible valve body 15 and a gas discharge portion 16 having one end inserted into the exhaust space portion 14 and the other end connected to the suction pipe 4 are provided.

  The swirl flow generator 11 has an annular space 10 formed between a cylindrical outer cylinder 11a and an inner cylinder 11b, and a gas introduction part 13 for introducing gas into the annular space 10 in a tangential direction is the outer cylinder 11a. It is attached to. The upper ends of the outer cylinder 11a and the inner cylinder 11b are closed by a closing plate 11c. A valve seat 15a having a valve hole 15b is fixed to the lower end of the inner cylinder 11b, and an exhaust space 14 is formed inside the inner cylinder 11b. The gas discharge part 16 is mounted in a state of penetrating the outer cylinder 11a and the inner cylinder 11b. Furthermore, in this embodiment, the flow restricting plate 10a is installed in a part of the annular space 10 so as to have a downward slope in the flow direction of the swirling flow. As shown in FIGS. 2A and 2B, the start end of the flow restricting plate 10 a is in front of the introduction direction of the gas introduced into the annular space 10 from the gas introduction portion 13 and above the gas introduction portion 13. Position {X position in FIG. 2 (a)}, the end of the flow restricting plate 10a is a position that has passed under the gas discharge section 16 (Y position in FIG. 2 (b)). The gas introduced into the annular space 10 from the gas introduction part 13 flows in the annular space 10 along the lower surface of the flow restricting plate 10 a and enters the centrifugal separator 12 while passing under the gas discharge part 16. Thereby, it is prevented that the swirling flow of the gas formed in the annular space 10 is obstructed by the gas discharge part 16.

  The centrifugal separator 12 is formed of a conical cylinder that gradually decreases in diameter downward, and is fixed to the lower end of the outer cylinder 11a or formed integrally with the outer cylinder 11a.

  The valve body 15 is housed inside the centrifugal separator 12, and is formed of the above-described valve seat portion 15a, a resin, a metal, or a rubber material, and a float 15c that can close the valve hole 15b of the valve seat portion 15a, It is comprised with the support body 15d which supports the float 15c so that a vertical movement is possible. In this embodiment, the support body 15c is composed of a plurality (three in this embodiment) of support rods, and there is an interval between adjacent support rods. An upper end portion of the support 15d is fixed to the valve seat portion 15a, and a fall prevention portion 15e for preventing the float 15c from dropping is fixed to the lower end portion of the support 15d.

  As shown in FIG. 1, the gas introduction port 13 a of the gas introduction unit 13 is located inside the storage tank 1, and the gas in the storage tank 1 is introduced into the swirl flow generation unit 11 through the gas introduction unit 13. In addition, the lower end opening 12a of the centrifugal separator 12 is also located inside the storage tank 1, and the liquid or solid (separated matter) separated from the gas by the centrifugal separator 12 passes through the storage tank 1 from the lower end opening 12a. Returned inside.

  When the negative pressure generator 5 is operated, the gas (air) in the storage tank 1 is sucked through the suction pipe 4 and the communication valve portion 3, and a negative pressure is generated in the storage tank 1. When a suction cock (not shown) connected to the suction pipe 2 is opened, the object is sucked by the negative pressure acting on the suction pipe 2 from the storage tank 1, and from the one end of the suction pipe 2 to the storage tank 1. To erupt. The object ejected into the storage tank 1 collides with the baffle plate 6 installed above the suction pipe 2 in the inclination direction, the flow velocity decreases, and the liquid and solid contents in the gas with a large specific gravity fall and the storage tank Accumulate in 1.

  As shown in FIG. 1, while the volume of the reservoir G stored in the storage tank 1 is small and the interface (liquid level) Ga is low, liquid and solids are stored in the storage tank 1 as described above. The separated gas mainly flows into the communication valve portion 3 from the lower end opening portion 12a of the centrifugal separation portion 12, and enters the exhaust space portion 14 through the centrifugal separation portion 12 and the valve body 15 therein. The gas flowing into the exhaust space 14 is sucked into the vacuum pump 5 through the gas discharge part 16 and the suction pipe 4.

  On the other hand, when the volume of the reservoir G stored in the storage tank 1 increases and the interface Ga rises, the gap between the lower end opening 12a of the centrifugal separator 12 and the interface Ga becomes small. The rate at which the gas in 1 flows into the gas inlet 13 from the gas inlet 13a increases as the interface Ga rises. In particular, as shown in FIGS. 2 and 3, when the lower end opening 12a of the centrifugal separator 12 is submerged in the reservoir G, all the gas in the storage tank 1 is supplied from the gas inlet 13a to the gas inlet. 13 flows in.

  As shown in FIGS. 2 and 3, the gas that has flowed into the gas introduction unit 13 is introduced from the gas introduction unit 13 into the annular space 10 of the swirl flow generation unit 11 and converted into a swirl flow while passing through the annular space 10. Is done. Then, the gas that has turned into the swirl flows into the centrifugal separation unit 12 that extends downward from the swirl flow generation unit 11, and spirally swirls within the centrifugal separation unit 12 while maintaining the swirl state, and proceeds downward. At that time, the liquid or solid content mixed in the gas is subjected to centrifugal force during swirling and is pushed to the inner wall surface side of the centrifugal separator 12, and the flow velocity decreases due to contact with the inner wall surface. And flows down into the reservoir G from the lower end opening 12a. On the other hand, when the gas from which the liquid or solid has been separated swirls and descends to some extent in the centrifugal separator 12 and the flow velocity is reduced, the gas is pulled from the exhaust space 14 to the negative pressure acting through the valve hole 15b of the valve seat 15a. Then, the central part of the centrifugal separation part 12 (valve body 15) rises, enters the exhaust space part 14, and is sucked into the vacuum pump 5 through the gas discharge part 16 and the suction pipe 4.

  As described above, by separating the liquid content and solid content in the gas sucked into the vacuum pump 5 from the storage tank 1 by the communication valve portion 3, the recovery efficiency of the object can be improved, and the vacuum pump 5 can be prevented from being damaged, lowering the durability and contaminating the surrounding environment.

DESCRIPTION OF SYMBOLS 1 Storage tank 2 Suction pipe 3 Communication valve part 4 Suction pipe 5 Vacuum pump 10 Annular space 11 Swirling flow generation part 12 Centrifugal separation part 12a Lower end opening part 13 Gas introduction part 13a Gas introduction part 14 Exhaust space part 15 Valve body 15a Valve seat 15b Valve hole 15c Float 15d Support

Claims (2)

A storage tank for storing the aspirated object, a suction pipe having one end inserted in the storage tank, a communication valve part provided at the upper part of the storage tank, and a suction pipe connected to the communication valve part In a suction recovery device comprising a negative pressure generator connected,
The communication valve section includes a swirling flow generating section having an annular space for generating a swirling flow of gas, a centrifugal separation section extending downward from the swirling flow generating section, and a gas introduction for introducing gas into the swirling flow generating section. A valve body capable of blocking communication between the exhaust space portion and the internal space of the storage tank, and an end in the exhaust space portion. Is inserted, and the other end is connected to the suction pipe,
The gas introduction port of the gas introduction part is located inside the storage tank, and the gas in the storage tank is introduced into the swirl flow generation part via the gas introduction part, and the lower end opening of the centrifugal separation part The suction recovery device is characterized in that a portion is located inside the storage tank, and a separated product separated from the gas by the centrifugal separation unit is returned to the inside of the storage tank from the lower end opening.   The valve body includes a valve seat portion provided at a lower end portion of the exhaust space portion, a float capable of closing the valve hole of the valve seat portion, and a support body that supports the float in a vertically movable manner. The suction recovery apparatus according to claim 1, wherein

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