JP6489962B2 - Slurry pump - Google Patents

Description

  The technology disclosed in the present specification relates to a slurry pump used for conveying a slurry (ie, a solid-liquid mixture) in which liquid and solid matter are mixed, such as sludge and food material.

  Patent Document 1 discloses a slurry pump. The slurry pump includes a casing, a rotatable impeller, a shaft that rotatably supports the impeller, and a motor that rotates the impeller via the shaft. The casing is formed with a slurry inlet and outlet. The impeller is formed by arranging a large number of blades at regular intervals in the circumferential direction between the main plate and the side plate. The shaft is inserted and fixed in the center of the main plate. The slurry pump discharges the slurry to the outside of the casing by applying a compressive force to the slurry in the casing by rotating the impeller at high speed with a motor.

JP2013-92049A

  The slurry pump of Patent Document 1 applies a compressive force to the slurry and conveys the slurry out of the casing. Therefore, it is necessary to rotate the impeller at high speed. As a result, the slurry (for example, the aggregate floc) may be damaged due to a large stirring force acting on the slurry by rotating the impeller at high speed. In particular, when the slurry is a food material, it may not be preferable that a solid (eg, a solid food material) in the slurry is broken.

  In this specification, the technique which suppresses the failure | damage of the solid substance in a slurry and can convey a slurry optimally is provided.

  A slurry pump disclosed in this specification includes a casing in which a suction port and a discharge port for slurry are formed, a rotating body (impeller) provided in the casing, and a drive mechanism that rotates the rotating body in the casing. ing. The casing includes a first wall portion, a second wall portion facing the first wall portion, and a peripheral wall portion provided between the first wall portion and the second wall portion. The peripheral wall portion is formed in a cylindrical shape, and one end portion in the central axis direction is closed by the first wall portion, and the other end portion in the central axis direction is closed by the second wall portion. The rotating body is disposed between the first wall portion and the second wall portion, and is formed of a shaft body provided at a position eccentric with respect to the central axis and an elastic material, and is provided on the outer periphery of the shaft body. And a plurality of fixed blades. As the rotating body rotates around the shaft body within the casing, the plurality of blades are elastically deformed in contact with the inner peripheral surface of the peripheral wall portion, the peripheral wall portion, the blade, the first wall portion, The volume of the conveyance space formed between the second wall portion gradually decreases. The discharge port is formed in at least one of the first wall portion, the second wall portion, and the peripheral wall portion in a range where the volume of the conveyance space gradually decreases.

  In the slurry pump, as the rotating body rotates in the casing around the shaft body, the plurality of blades are elastically deformed in contact with the inner peripheral surface of the peripheral wall portion, and the peripheral wall portion, the blade, and the first wall The volume of the conveyance space formed between the part and the second wall part gradually decreases. Thereby, the slurry accommodated in the conveyance space is gradually compressed and discharged out of the casing through the discharge port. That is, in the slurry pump, the slurry can be compressed by gradually reducing the volume of the conveyance space, and the compressed slurry can be discharged from the discharge port. Therefore, in this slurry pump, the slurry can be conveyed without rotating the rotating body at high speed. Further, since the blades are formed of an elastic material, it is possible to suppress an excessive stirring force from being applied to the slurry. Therefore, according to said slurry pump, damage of the solid substance in a slurry can be suppressed. Therefore, the slurry can be conveyed in an optimum state.

  The discharge port may be formed in the peripheral wall portion in a range where the volume of the conveyance space gradually decreases.

  The drive mechanism can rotate the rotating body at a rotation speed of 60 rpm or less. According to this configuration, it is possible to suppress a large centrifugal force from being applied to the slurry and to apply an appropriate compressive force to the slurry. The slurry can be conveyed in a more optimal state.

The perspective view which shows the whole structure of the slurry pump of 1st Example. Front explanatory drawing which partially showed the casing of the slurry pump of FIG. 1 in the cross section. FIG. 2 is an explanatory plan view partially showing a casing of the slurry pump in FIG. 1 in cross section. The perspective view which shows the whole structure of the slurry pump of 2nd Example. Front explanatory drawing which partially showed the casing of the slurry pump of FIG. 4 in the cross section.

(First embodiment)
The slurry pump 2 shown in FIG. 1 is a slurry pump used for conveying a slurry (solid-liquid mixed raw material) in a state where a liquid and a solid are mixed, such as sludge and food material. As shown in FIG. 1, the slurry pump 2 includes a casing 10, a rotating body 40, a rotating shaft 70, bearings 80 and 90, and a motor 100.

  As shown in FIGS. 1 to 3, the casing 10 is a container for containing a rotating body 40 in a rotatable manner and for introducing a slurry to be conveyed. The casing 10 includes a flat plate-like first wall portion 12, a second wall portion 14 facing the first wall portion 12, and a peripheral wall portion 16 provided between the first wall portion 12 and the second wall portion 14. Have. The peripheral wall portion 16 is formed in a cylindrical shape. One end portion of the cylindrical peripheral wall portion 16 in the central axis direction is closed by the first wall portion 12, and the other end portion is closed by the second wall portion 14.

  As shown in FIG. 2, a suction port 18 for feeding slurry into the casing 10 is formed in a part of the peripheral wall portion 16. The suction port 18 is formed in a range where the blades 42 a to 42 f of the rotating body 40 do not contact with each other in the peripheral wall portion 16. The suction port 18 is connected to a suction pipe 30 for introducing slurry supplied from the outside into the suction port 18.

  As shown in FIGS. 2 and 3, a discharge port 20 for discharging the slurry in the casing 10 to the outside is formed in a part of the second wall portion 14. More specifically, the discharge port 20 is formed in the second wall portion 14 in a range where the blades 42 a to 42 f of the rotating body 40 are in contact with the peripheral wall portion 16. That is, the discharge port 20 includes a part of the plurality of blades 42a to 42f of the rotating body 40 (the blades 42b, 42c, 42d, and 42e in the example of FIG. 2), the first wall portion 12, and the second wall. A range in which a conveyance space (50a to 50c in FIG. 2) is formed between the portion 14 and the peripheral wall portion 16, and a range in which the volume of the conveyance space gradually decreases as the rotating body 40 rotates. Is formed on the second wall portion 14. The discharge port 20 is connected to a discharge pipe 32 for transporting the slurry discharged from the discharge port 20 to the outside of the casing 10.

  The rotating body (impeller) 40 is rotatably accommodated in the casing 10. As shown in FIG. 2, the rotating body 40 includes a shaft portion 41 and a plurality of (six in the example in the figure) blades 42 a to 42 f. The shaft portion 41 is fixed to a rotating shaft 70 inserted into the casing 10 and rotates synchronously with the rotating shaft 70. The center 44 of the shaft portion 41 (that is, the center of the rotation shaft 70) is disposed at a position that is eccentric with respect to the center shaft 11 of the cylindrical peripheral wall portion 16. Further, as illustrated in FIG. 3, the rotating body 40 is densely disposed (no gap) between the first wall portion 12 and the second wall portion 14. That is, the side surface of the rotating body 40 is in contact with the first wall portion 12 and the second wall portion 14.

  As shown in FIG. 2, each of the blades 42 a to 42 f is fixed to the outer periphery of the shaft portion 41. The blades 42a to 42f are made of an elastic material such as rubber or resin, for example. As described above, since the center 44 of the shaft portion 41 (that is, the center of the rotation shaft 70) is disposed at an eccentric position with respect to the center shaft 11 of the peripheral wall portion 16, one of the plurality of blades 42a to 42f. The portions (five blades 42b to 42f in the example of FIG. 2) are in contact with the inner surface of the peripheral wall portion 16 and elastically deformed. Further, each of the blades 42a to 42f is formed in a shape in which the portion near the tip is thicker than the portion near the shaft portion 41. That is, the portions near the shaft portion 41 of the blades 42a to 42f are formed more easily than the portions near the tip. Since it has such a shape, any of the blades 42 a to 42 f can be easily elastically deformed when contacting the peripheral wall portion 16. Hereinafter, the plurality of blades 42a to 42f may be collectively referred to simply as “blade 42”.

  The rotating shaft 70 is inserted into the casing 10 and the shaft portion 41 of the rotating body 40. Further, as described above, the rotation shaft 70 is fixed to the shaft portion 41. Therefore, the rotating shaft 70 and the rotating body 40 rotate synchronously. Of the rotating shaft 70, a portion protruding outside the casing 10 is rotatably supported by bearings 80 and 90.

  The motor 100 is fixed to one end of the rotating shaft 70. The motor 100 can rotate the rotating shaft 70. When the motor 100 rotates the rotating shaft 70, the rotating body 40 fixed to the rotating shaft 70 rotates in the casing 10. The rotation speed at which the motor 100 rotates the rotating body 40 is about 60 rpm. In other examples, the rotational speed may be slower than 60 rpm, and in particular may be 20 rpm or less.

(Operation of slurry pump 2)
The operation of the slurry pump 2 having the above configuration will be described. When the slurry is conveyed using the slurry pump 2 of this embodiment, the casing 10, the suction pipe 30, and the discharge pipe 32 are filled with liquid as priming water in advance. Furthermore, the end of the suction pipe 30 is connected to a slurry supply unit (not shown). Then, the operator drives the motor 100. When the motor 100 is driven, the rotating shaft 70 rotates, and accordingly, the rotating body 40 (impeller) rotates around the rotating shaft 70 in the casing 10. The rotating body 40 rotates in the direction of arrow A in FIG.

  As the rotating body 40 rotates, 3 to 5 of the plurality of blades 42a to 42f come into contact with the inner surface of the peripheral wall portion 16 and elastically deform. As a result, for example, as shown in FIG. 2, conveyance spaces 50 a, 50 b, and 50 c are formed between the blades 42 b to 42 e that are in contact with the peripheral wall portion 16, the first wall portion 12, the second wall portion 14, and the peripheral wall portion 16. Is done. As the rotator 40 rotates, the volumes of the transfer spaces 50a to 50c gradually decrease. As a result, the suction pressure is reduced by the priming water accommodated in each of the transfer spaces 50 a to 50 c and is discharged to the discharge pipe 32 through the discharge port 20 formed in the second wall portion 14. Hereinafter, the conveyance spaces such as the conveyance spaces 50a to 50c in FIG. 2 may be collectively referred to simply as the “conveyance space 50”.

  As the priming water previously filled in the casing 10 is discharged to the discharge pipe 32 through the discharge port 20, a negative pressure acts in the casing 10 and the suction pipe 30. As a result, the slurry is fed into the casing 10 from the slurry supply unit via the suction pipe 30 and the suction port 18 (that is, sucked).

  The slurry sucked into the casing 10 is formed between the blades 42 in contact with the peripheral wall portion 16, the first wall portion 12, the second wall portion 14, and the peripheral wall portion 16 as the rotating body 40 rotates. It is accommodated in a transfer space 50 (see transfer spaces 50a to 50c in FIG. 2). As described above, as the rotating body 40 rotates, the volume of each conveyance space 50 gradually decreases. As a result, the slurry accommodated in each conveyance space 50 is gradually compressed and discharged (that is, pumped) to the discharge pipe 32 through the discharge port 20.

  Thereafter, by continuously rotating the rotating body 40, the slurry is continuously sucked into the casing 10 through the suction pipe 30 and the suction port 18, and the slurry in the casing 10 is discharged through the discharge port 20. She continues to vomit.

  The configuration and operation of the slurry pump 2 of the present embodiment have been described above. Next, the function and effect of this embodiment will be described. As described above, in the slurry pump 2 of the present embodiment, at least one of the plurality of blades 42a to 42f is the peripheral wall portion 16 as the rotating body 40 rotates within the casing 10 about the rotating shaft 70. The volume of the conveyance space 50 formed between the peripheral wall part 16, the blade 42, the first wall part 12, and the second wall part 14 is gradually reduced. Thereby, the slurry accommodated in the conveyance space 50 is gradually compressed and discharged to the discharge pipe 32 through the discharge port 20. That is, in the slurry pump 2 of the present embodiment, the slurry can be compressed by gradually reducing the volume of the conveyance space 50, and the compressed slurry can be discharged from the discharge port 20. Therefore, the slurry pump 2 can discharge the slurry without rotating the rotating body 40 at a high speed. Specifically, in this embodiment, the rotation speed at which the motor 100 rotates the rotating body 40 is about 60 rpm (60 rotations per minute). This rotational speed is slower than the rotational speed (100 rpm or more) of the impeller of the conventional slurry pump. That is, in the slurry pump 2, it is possible to suppress a large stirring force from being applied to the slurry. Moreover, since the blade | wing 42 is formed with the elastic material, it can also suppress that an excessive stirring is added to a slurry. As a result, according to the slurry pump 2 of the present embodiment, it is possible to suppress breakage of the solid matter contained in the slurry. Therefore, the slurry can be conveyed in an optimum state.

  Furthermore, since the blades 42 are made of an elastic material, even if the slurry contains foreign matters such as glass pieces and metal pieces, the foreign matters are caught between the rotating body 40 and the peripheral wall portion 16. Can also be prevented. Therefore, it is possible to suppress the occurrence of a situation where the rotation of the rotating body 40 is hindered by the foreign matter or the casing 10 is damaged by the foreign matter. Moreover, it is excellent also in the abrasion resistance of the rotary body 40 in the case of conveying the slurry with strong adhesive force (viscosity) containing granular materials, such as a glass grain and a sand grain.

  Here, the correspondence between the description of the present embodiment and the description of the claims will be described. The rotating shaft 70 and the shaft portion 41 are examples of “shaft bodies”. The motor 100 is an example of a “drive mechanism”.

(Second embodiment)
With reference to FIGS. 4 and 5, the slurry pump 102 of the present embodiment will be described focusing on differences from the first embodiment. 4 and 5, elements having the same configuration as in the first embodiment are indicated by the same reference numerals as in FIGS. 1 to 3, and detailed description thereof is omitted. In this embodiment, the formation position of the discharge port 120 and the arrangement position of the discharge pipe 132 are different from those of the first embodiment.

  As shown in FIG. 5, in the present embodiment, the discharge port 120 is formed in the peripheral wall portion 16. In the example of FIG. 5, a plurality of discharge ports 120 are formed in the peripheral wall portion 16 in a range where the blades 42 a to 42 f of the rotating body 40 are in contact with each other. In other words, in the discharge port 120, a conveyance space 50 is formed between some of the blades 42a to 42b of the rotating body 40, the first wall portion 12, the second wall portion 14, and the peripheral wall portion 16, And it is opened by the surrounding wall part 16 in the range which the volume of said conveyance space 50 reduces gradually with rotation of the rotary body 40. As shown in FIG. In another example, only one discharge port 120 may be formed at one place. A discharge pipe 132 is connected to the discharge port 120. As shown in FIGS. 4 and 5, in the present embodiment, the discharge pipe 132 is disposed outside the peripheral wall portion 16.

  The operation of the slurry pump 102 of this embodiment is the same as that of the slurry pump 2 of the first embodiment. Therefore, detailed description is omitted. Further, the slurry pump 102 of the present embodiment can also exhibit the same operational effects as the slurry pump 2 of the first embodiment.

  As mentioned above, although the Example of the technique disclosed by this specification was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, the following modifications may be included.

(Modification 1) In each of the above embodiments, the blades 42a to 42f of the rotating body 40 are fixed to the outer periphery of the shaft portion 41 at equal intervals (see FIGS. 2 and 5). Without being limited thereto, the blades of the rotating body may be fixed to the shaft portion at different intervals. In that case, the slurry pump can convey the slurry irregularly (in a pulsating flow), for example, intermittently convey the slurry.

(Modification 2) The shape of the rotating body 40 is not limited to the above, and may be arbitrary. For example, the number of blades is not limited to six and may be arbitrary. Further, the shape of each blade is not limited to that shown in FIGS. 2 and 5 and may be arbitrary. Moreover, you may arrange | position the several rotary body from which the fixed angle of a blade | wing differs in an axial direction in a casing.

(Modification 3) The formation position of the discharge port and the arrangement position and shape of the discharge pipe are not limited to the positions and shapes described in the above embodiments. Therefore, for example, the discharge port may be formed in the first wall portion in a range where the blades of the rotating body are in contact with the peripheral wall portion. In that case, the discharge pipe may be arranged outside the first wall portion. In other words, the shape (area), location, and number of the opening of the discharge port can be changed. Generally speaking, the discharge port may be formed in at least one of the first wall portion, the second wall portion, and the peripheral wall portion in a range where the volume of the conveyance space gradually decreases.

(Modification 4) The formation position of the suction port and the placement position of the suction pipe are not limited to the positions described in the above embodiments. Therefore, for example, the suction port may be formed in the first wall portion or the second wall portion.

(Modification 5) The rotational speed at which the motor 100 rotates the rotating body 40 is not limited to 60 rpm. The motor 100 may rotate the rotating body 40 at an arbitrary rotation speed. However, the motor 100 is preferably rotated at a rotation speed of 60 rpm or less (particularly 20 rpm or less).

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Slurry pump 10: Casing 11: Central shaft 12: First wall 14: Second wall 16: Peripheral wall 18: Suction port 20: Discharge port 30: Suction tube 32: Discharge tube 40: Rotating body 41: Shaft Parts 42a to 42b: blades 44: shaft centers 50a to 50c: conveying space 70: rotating shaft 80, 90: bearing 100: motor 102: slurry pump 120: discharge port 132: discharge pipe

Claims (1)

A slurry pump,
A casing in which a slurry inlet and outlet are formed;
A plurality of rotating bodies provided in the casing;
A drive mechanism for rotating the plurality of rotating bodies in the casing;
The casing is
A first wall;
A second wall facing the first wall;
A peripheral wall provided between the first wall and the second wall;
The peripheral wall portion is formed in a cylindrical shape, and one end portion in the central axis direction is closed by the first wall portion, and the other end portion in the central axis direction is closed by the second wall portion. And
Each of the plurality of rotating bodies is
Disposed between the first wall and the second wall;
A shaft provided at a position eccentric with respect to the central axis;
It is made of an elastic material, and has a plurality of blades fixed to the outer periphery of the shaft body,
Each of the plurality of blades is formed in a shape in which the second part near the tip is thicker than the first part near the shaft,
The plurality of rotating bodies are arranged in an axial direction in the casing such that the fixed angles of the blades are different from each other,
As the plurality of rotating bodies rotate around the shaft in the casing, the plurality of blades provided on each rotating body are in contact with the inner peripheral surface of the peripheral wall portion and elastically deformed. The volume of the conveyance space formed between the peripheral wall portion, the blades of the plurality of rotating bodies, the first wall portion, and the second wall portion is gradually reduced.
The discharge port is formed in at least one of the first wall portion and the second wall portion in a range in which the volume of the transport space gradually decreases.
The drive mechanism rotates the rotating body at a rotation speed of 60 rpm or less;
Slurry pump.

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