JP2018178772A - Pump for sewage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a solid matter hardly clogging while maintaining efficiency of a pump in a pump for sewage.SOLUTION: A pump for sewage includes: a suction part 4 having a suction port 4a1 from which sewage is sucked; and an impeller 3b for transporting the sewage flowing therein from the suction part 4 to a discharge port 2c1. A movable part 4b which constitutes at least part of the suction part 4 is movable on a radial outside in an axial direction of the impeller 3b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sewage pump.

  In sewage treatment facilities and the like, a sewage pump having an impeller is used to pump sewage or wastewater containing solid matter in the form of fibers or solids, etc. For example, Patent Document 1 discloses that sewage is transported A pump is disclosed.

Unexamined-Japanese-Patent No. 11-201087

  In such a dirty water pump, when solid particles are sucked from the suction portion, if the particle size of the solid is large, large friction occurs with the inner surface of the suction portion, and the inner surface of the suction portion is abraded. It will be easier. However, if the flow path diameter of the dirty water pump is increased so that the solid matter does not clog the dirty water pump, the efficiency of the pump decreases and it is difficult to efficiently feed the dirty water.

  The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a dirty water pump that makes it difficult for a solid to clog while maintaining the efficiency of the pump.

  [Means for Solving the Problems] As a first means for solving the above-mentioned problems, the present invention provides a sewage pump comprising: a suction portion having a suction port for sucking in sewage; and an impeller for sending sewage flowing from the suction portion to a discharge port. And a movable portion which is at least a part of the suction portion is movable radially outward and axially of the impeller.

  As a second means, in the first means, an urging member for urging the movable portion radially inward and axially of the impeller is employed.

  As a third means, in the first or second means, a configuration is adopted in which a sealing member for sealing the gap of the movable portion is provided.

  As a fourth means, in any one of the first to third means, the suction portion has a configuration in which a plurality of the movable portions are provided.

  According to the present invention, the movable portion, which is a part of the suction portion, is movable in the radially outer side and in the axial direction of the impeller. As a result, when a solid having a large particle size flows into the suction portion, the movable portion moves, whereby the flow passage diameter in the suction portion can be expanded. Therefore, in the dirty water pump according to the present invention, since the flow passage diameter of the suction portion is not normally changed in the normal time, it is possible to prevent the solid matter from being clogged while maintaining the efficiency of the pump.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the whole of the pump for sewage in one Embodiment of this invention. It is sectional drawing to which the principal part of the pump for waste water in one Embodiment of this invention was expanded.

  Hereinafter, an embodiment of a dirty water pump according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

  FIG. 1 is a cross-sectional view showing the whole of the dirty water pump 1 in the present embodiment. Moreover, FIG. 2 is sectional drawing to which the principal part of the pump 1 for sewage in this embodiment was expanded. The sewage pump 1 of the present embodiment is a pump provided, for example, in a sewage treatment facility, and pumping the sewage containing a fibrous solid portion or a solid having a large particle diameter. As shown in FIG. 1, the dirty water pump 1 includes a pump housing 2, a rotation mechanism 3, and a suction unit 4.

  The pump housing 2 is a housing in which the sewage flow passage R is formed and which accommodates the rotation mechanism 3. The pump housing 2 has an upper housing 2a in which a motor (not shown) and the like are accommodated, an intermediate housing 2b connected to the upper housing 2a, a lower housing 2c connected to the intermediate housing 2b, and an inlet member 4a. ing. The lower housing 2c is internally formed with a semi-annular sewage flow passage R through which sewage passes, an opening is formed at the center of the bottom, and one end side of the sewage flow passage R on the side of the lower housing 2c. The discharge port 2c1 to be provided is formed.

  The rotation mechanism 3 has a rotating shaft portion 3a and an impeller 3b. The rotating shaft portion 3 a is an elongated member which is rotated by being connected to a rotor of a motor (not shown) accommodated in the pump housing 2. The impeller 3b has a hub 3b1, a main plate 3b2, and a wing 3b3. The hub 3b1 is a cylindrical portion that fixes the main plate 3b2 to the rotary shaft 3a. The main plate 3b2 is fixed to the rotation shaft 3a via the hub 3b1, and the wing 3b3 is fixed. The wing portion 3b3 is a flat plate-like member disposed along the axial direction of the rotary shaft portion 3a from the main plate portion 3b2 and radially outward of the rotary shaft portion 3a. The impeller 3b as described above is rotated by a motor to push the sewage in the sewage flow passage R toward the discharge port.

  The suction portion 4 is attached to the opening of the lower housing 2c, as shown in FIGS. 1 and 2, and includes an inlet member 4a, a plurality of movable plates 4b (movable portions), and a spring 4c (biasing member). It has the seal | sticker part 4d (sealing member). The inlet member 4a is a cylindrical member having a suction port 4a1 provided below the dirty water flow path R, the end of which is attached to the opening of the bottom of the lower housing 2c, and in the upper (or opening) The diameter is expanded towards. Further, the inlet member 4a is provided to the wing 3c3 of the impeller 3c with a large gap of about several centimeters as compared with the conventional case. A movable plate 4b and a spring 4c are provided in the gap of the inlet member 4a.

  The movable plate 4b is disposed on the inside of the inlet member 4a so as to overlap with the tip end of the wing 3b3 of the impeller 3b. The movable plate 4b is formed of a plurality of parts formed by dividing a cylindrical member having a diameter enlarged toward the upper end so as to be parallel to the inlet member 4a at a plurality of locations in the circumferential direction. ing. Such a movable plate 4b can be moved independently for each of the divided parts.

  The spring 4c is a coil spring provided in plurality between the movable plate 4b and the inner peripheral surface of the enlarged diameter portion of the inlet member 4a. One spring 4c is provided for each of the movable plates 4b divided into a plurality of parts, one for each in the enlarged diameter portion (that is, the bent portion in the axial cross section of the movable plate 4b), thereby rotating the movable plate 4b. The shaft 3a is urged upward in the axial direction (the impeller 3b side) and radially inward. The seal part 4d is a member for sealing a gap between parts of the movable plate 4b divided into a plurality of parts and a gap between the movable plate 4b and the entrance member 4a, and is flexible so that the movable plate 4b can be moved. It is comprised by the sex member etc.

  The sewage pump 1 according to the present embodiment is a pump that is installed in a tank, a pipe, or the like in which sewage containing solid matter is stored, and pumps the sewage together with the solid matter. When the dirty water pump 1 is driven, the motor starts to rotate, and the rotary shaft portion 3a is rotated. The impeller 3b starts rotating with the rotation of the rotating shaft portion 3a, and the wing portion 3b3 pushes out the dirty water that has flowed into the dirty water flow path R from the suction port 4a1 in the circumferential direction. Thereby, the sewage which flowed in from the suction port 4a1 passes the semi-annular sewage flow path R, and is discharged from the discharge port 2c1.

  Further, in the dirty water pump 1, when a solid having a particle diameter larger than the flow passage diameter of the enlarged diameter portion of the inlet member 4a flows in from the suction port 4a1, the solid moves axially lower than the movable plate 4b. And a load is applied in the radially outward direction. Thereby, the spring 4c which biases the movable plate 4b is compressed, and the parts of the movable plate 4b which receives the load from the solid matter move axially downward and radially outward. Thereby, in the enlarged diameter portion of the inlet member 4a, the flow passage diameter is enlarged, and the solid matter can be flowed into the sewage flow passage R.

  According to the present embodiment, the movable plate 4b of the suction portion 4 is movable in the direction in which the flow passage diameter is enlarged. As a result, the flow channel diameter can be normally set to the conventional diameter, and the flow channel diameter can be expanded only when a solid having a larger particle diameter than the flow channel diameter of the enlarged diameter portion flows. Therefore, in the dirty water pump 1, it is possible to prevent the solid matter from being clogged while maintaining the efficiency of the pump. Moreover, by enlarging the flow path diameter of the suction part 4, a large frictional force does not arise between a solid and the suction part 4, and abrasion of the suction part 4 can be prevented.

  Further, according to the present embodiment, the movable plate 4b is biased by the spring 4c. Thereby, the movable plate 4b can be moved and the flow passage diameter can be expanded without performing complicated control. Therefore, the dirty water pump 1 in the present embodiment is simple in structure and easy to manufacture.

  Further, according to the present embodiment, the seal portion 4d for sealing the gap between the movable plate 4b and the gap between the movable plate 4b and the inlet member 4a is provided. Thereby, it can prevent that sewage flows in between the movable plate 4b and the inlet member 4a. Therefore, the pump 1 for sewage in this embodiment does not impair maintainability.

  Further, according to the present embodiment, the movable plate 4b can be divided into a plurality of parts, and can be moved for each part. Thereby, the diameter expansion amount of the suction part 4 at the time of the large solid of a particle size flowing in can be made small. Therefore, the dirty water pump 1 in the present embodiment can minimize the decrease in pump efficiency at the time of diameter expansion of the suction portion 4.

  As mentioned above, although the suitable embodiment of the present invention was described referring to drawings, the present invention is not limited to the above-mentioned embodiment. The shapes, combinations, and the like of the constituent members shown in the above-described embodiment are merely examples, and various changes can be made based on design requirements and the like without departing from the spirit of the present invention.

  In the said embodiment, although the structure which biases the movable plate 4b by the spring 4c was employ | adopted, this invention is not limited to this. It is also possible to provide an elastic body such as rubber between the movable plate 4b and the inlet member 4a. Also in this case, the movable plate 4b can move in the direction of the axially lower side and the radially outer side when a load is applied in the direction of the axially lower side and the radially outer side. It is possible to widen the path diameter. Further, by providing a rubber material on the entire surface between the movable plate 4b and the inlet member 4a, the gap between the movable plate 4b and the inlet member 4a can be sealed without providing the seal portion 4d.

  The movable plate 4b may be a curved plate along the inner peripheral surface of the inlet member 4a, and may be provided in a groove provided along the radial direction of the inlet member 4a. In this case, the movable plate 4b is urged radially inward and axially upward by a spring 4c provided on the bottom surface of the groove of the inlet member 4a, so that the movable plate 4b is normally inside the inlet member 4a. It is fixed without a gap with the peripheral surface. When a solid having a large particle size passes over the movable plate 4b, the spring 4c is compressed, and the movable plate 4b enters the inside of the groove to expand the diameter of the suction portion 4 and a solid having a large particle size Can pass through.

  Moreover, it is also possible to employ a configuration in which the movable plate 4b is moved by an actuator. For example, the inlet member 4a may be provided with a sensor for monitoring the inflow of solids, and the movable plate 4b may be moved when a solid having a large particle size flows in based on a signal from the sensor .

  Also, the springs 4c may be provided at a plurality of places for each of the divided parts of the movable plate 4b. In this case, the movable plate 4b can be biased more stably.

1 Sewage pump 2c1 Discharge port 3 Rotation mechanism 3b Impeller 4 Suction part 4a Inlet member 4a1 Suction port 4b Movable plate 4c Spring 4d Seal part R Sewage flow path

Claims (4)

A sewage pump comprising: a suction portion having a suction port into which dirty water is sucked; and an impeller for sending dirty water flowing in from the suction portion to a discharge port,
A dirty water pump characterized in that a movable part, which is at least a part of a suction part, is movable radially outward and axially of the impeller.   The sewage pump according to claim 1, further comprising a biasing member configured to bias the movable portion radially inward and axially of the impeller.   The sewage pump according to claim 1 or 2, further comprising a sealing member sealing a gap of the movable portion.   The said suction part has multiple said movable parts, The pump for sewage as described in any one of Claims 1-3 characterized by the above-mentioned.

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