JP2002195184A - Remaining water treatment pump and check packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remaining water treatment pump capable of draining water completely at very low water level without reducing suction efficiency from a strainer bottom plate when driving the pump, preventing the back flow of water when stopping the pump, and being used in the suction work of stagnant water on a floor and provide a check packing thereof. SOLUTION: The check packing made of an elastic thin plate forming a plurality of tongue pieces 11 is used in which flexible parts 11a, 11a perform dihedral action by forming a peripheral part on an annular mounting face 8 and applying radial cut-in and branched cut-in. When the pump is driven, each tongue piece 11 leaves the strainer bottom plate 4, and a small suction hole 7 is opened and communicated with a pump suction opening 3. When the pump is stopped, each tongue piece 11 adheres closely on the strainer bottom plate 4 to shut off the communication between the small suction hole 7 and the pump suction opening 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a residual water treatment pump and its non-return packing.

[0002]

2. Description of the Related Art As a measure for enabling drainage at an ultra-low water level, there is an apparatus in which the opening position of a pump suction port is made as low as possible. There is a disadvantage that water flows backward.

It has been proposed to provide a check packing as shown in FIG. 7 on a strainer bottom plate so as to eliminate such a drawback and prevent water from flowing backward when the pump is stopped. However, when the pump is driven, as shown in FIGS. 8 and 9, the tip of each tongue piece 111.
1... 111 From the root to the middle part, the suction small holes 107 are hardly separated from the strainer bottom plate 104.
There is a new problem that the opening of 107 is insufficient and the amount of water flowing from the strainer bottom plate 104 decreases.

As shown in FIG. 10, when the width of the tongue pieces 211 is reduced to increase the number thereof, the vicinity of the root of each tongue piece 211... 211 is also separated from the bottom plate 204 and the suction small holes 207.
The openness of 207 is improved. However, perforated portions and non-perforated portions are separated on the strainer bottom plate in accordance with the number of tongue pieces. Specifically, in the case of four tongue pieces, the perforation mode is as shown in FIG. 3, and in the case of eight tongue pieces, the perforation mode is as shown in FIG. In other words, in order to increase also the total area of the non-perforated portion of the strainer bottom plate on As the number of tongues, so that eventually the suction efficiency decreases. Therefore, this proposal cannot be put to practical use.

[0005]

An object of the present invention is an object of the invention, the waste water of ultra-low water level without reducing the suction efficiency of the strainer bottom plate when the pump drive is completely performed, moreover In the time of pump stop water to backflow It is an object of the present invention to provide a residual water treatment pump and its non-return packing, which can be used for the operation of sucking accumulated water from the floor without any problem.

[0006]

In the residual water treatment pump according to the present invention, a suction port is opened at the center, and the strainer bottom plate is opposed to the suction cover forming the lower bottom portion of the pump volute with a slight gap therebetween. An annular seat portion is provided in the peripheral portion of the lower surface of the, and a narrow water passage groove is provided at the lower edge thereof, and the peripheral side between the opposed surfaces of the suction cover and the strainer bottom plate is closed in a non-porous manner. A plurality of suction holes are provided in the strainer bottom plate, and the residual water treatment pump has a check gasket mounted on the strainer bottom plate so that the suction holes and the pump suction hole can flow through the check gasket. The check gasket is divided into a plurality of tongue pieces by making a radial cut from the center perforated portion of the elastic thin plate having a peripheral portion formed on an annular mounting surface to the vicinity of the mounting surface. Before leaving a narrow connection at the root By making a branched cut that moves in the circumferential direction from the end of the cut, a flexible portion that performs an upward reaction with the end portion of the cut as a fulcrum and a flexible portion that performs an upward reaction with the connecting portion as a fulcrum are each When the pump is driven, each tongue of the check packing separates from the strainer bottom plate to open the suction hole, and when the pump is stopped, each tongue of the check packing is placed on the strainer bottom plate. The suction hole was configured so as to be closed closely. Further, the check packing according to the present invention is a check packing mounted on a strainer bottom plate of a residual water treatment pump, wherein a peripheral portion of the elastic thin plate formed on an annular mounting surface is formed from a central perforated portion of the elastic thin plate. A radial cut is made close to the tongue to divide it into a plurality of tongues, and a narrow cut is made at the base of each tongue so as to move in a circumferential direction from the end of the cut. By applying, each tongue piece has a flexible portion that performs an upward reaction with the end portion of the cut as a fulcrum and a flexible portion that performs an upward reaction with the connection portion as a fulcrum.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.

Reference numeral 1 denotes a pump swirl chamber, and reference numeral 2 denotes a suction cover constituting the lower bottom of the pump swirl chamber 1. A pump suction port 3 is formed in the center. Reference numeral 4 denotes a strainer bottom plate which is fixed with a slight gap from the suction cover 2, and has an annular seat portion 5 provided around the lower surface thereof, and narrow water passage grooves 6 at the lower edge thereof. Arrange. Reference numeral 7 designates a number of small suction holes formed on the strainer bottom plate 4, and the peripheral side between the opposed surfaces of the strainer bottom plate 4 and the suction cover 2 is closed in a non-porous manner. The non-return gasket mounted on the strainer bottom plate 4 is made of an elastic thin plate such as rubber, and has a peripheral portion formed on an annular mounting surface 8, and has a radial shape reaching from the central perforated portion 9 to near the mounting surface 8. 10 are divided into a plurality of tongue pieces 11... 11 and each tongue piece 11
.. by making branch cuts 13, 13 extending in the circumferential direction from the end of the cut 10 so as to leave the narrow connection portion 12 at the root of the cut 11,
Each of the tongue pieces 11... 11 includes a flexible portion 11 a, 11 a that performs an upward reaction with the end portions 13 e, 13 e of the third member as a fulcrum, and a flexible portion 11 b that performs an upward reaction with the connecting portion 12 as a fulcrum.
Are configured to have both.

[0009]

[Action] is when the pump is stopped as shown in FIG. 1 each tongue 11 -
Since 11 is in close contact with the strainer bottom plate 4, the small suction holes 7,... 7 and the pump suction port 3 are in a state where conduction is cut off. However, when the pump is started, a negative pressure is generated in the lower part of the impeller, so that each tongue piece 11... 11 causes an upward reaction and separates from the strainer bottom plate 4 as shown in FIG. The pump suction port 3 is in a conductive state, and the water sucked through the narrow water passage grooves 6 is discharged from the discharge port through the inside of the pump swirl chamber 1. Each tongue piece 11 described above
······································································································ And so on, so that the suction holes 7
And the suction efficiency from the strainer bottom plate 4 is improved. When the pump operation is stopped at the completion water level of the drainage, the pressure of the return water in the pump swirl chamber 1 and the drainage pipe causes the tongues 11 to closely contact the strainer bottom plate 4 as shown in FIG. Since the suction holes 7 are closed, a backflow prevention function works.

[0010]

According to the present invention, a narrow water passage groove 6 opened at an extremely low position close to the pump mounting floor surface.
However, the opening of the suction small holes 7,... 7 by the check packing is excellent as described above, and the suction efficiency from the strainer bottom plate 4 is improved. It has the advantage of completely draining at an ultra-low water level without generating residual water, and has the advantage that water does not flow backward even when the pump is stopped, and can be used for suction work such as accumulated water on the floor. It is.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a main part when a residual water treatment pump of the present invention is stopped.

FIG. 2 is a vertical sectional side view of a main part when the residual water treatment pump of the present invention is driven.

3 is a plan view of the strainer bottom plate of the present invention the residual water treatment pump.

FIG. 4 is a plan view of the check packing of the present invention.

FIG. 5 is a vertical sectional side view showing the relationship between the check packing mounted on the residual water treatment pump of the present invention and the strainer bottom plate when the tongue is turned upside down.

FIG. 6 is a cross-sectional view of the book taken along the line AA in FIG.

FIG. 7 is a plan view of a non-return packing proposed for residual water treatment and not functioning effectively.

FIG. 8 is a vertical sectional side view of a main part showing a relationship with a strainer bottom plate at the time of a reversal operation of a tongue piece in a case where the check packing of FIG. 7 is mounted on a residual water treatment pump.

FIG. 9 is a cross-sectional view taken along the line BB in FIG.

FIG. 10 is a plan view of a check packing that has been proposed as an improvement of the check packing shown in FIG. 7 and has not functioned effectively.

FIG. 11 is a plan view showing the arrangement of suction holes in the strainer bottom plate corresponding to the check gasket of FIG. 10;

[Explanation of symbols]

1 pump swirl chamber 2 inlet cover 3 pump suction port 4 strainer bottom plate 5 an annular seat 1 narrow gap-like water passing grooves 2 suction small holes 8 an annular mounting surface 9 central bore portion 10 radial cuts 11 tongue 11a branched Flexible part 11b performing an upward reaction with the end of the cut as a fulcrum 11b Flexible part 12 performing an upward reaction with the connecting part as a fulcrum 12 Connecting part 13 Branched cut 13e Terminal end of the branched cut

Claims (2)

[Claims] 1. A strainer bottom plate is opposed to a suction cover forming a lower bottom portion of a pump volute chamber with a slight gap therebetween by opening a suction port in the center, and an annular seat is provided around a lower surface of the strainer bottom plate. A narrow water passage groove is provided at the lower edge thereof, and the peripheral side between the suction cover and the facing surface of the strainer bottom plate is closed in a non-porous manner, and a large number of small suction holes are formed in the strainer bottom plate. A residual water treatment pump in which a check gasket is mounted on a strainer bottom plate such that the suction small hole and the pump suction hole flow through the check gasket. Is divided into a plurality of tongues by making a radial cut from the center perforated portion of the elastic thin plate formed on the annular mounting surface to the vicinity of the mounting surface, and a narrow connecting portion is provided at the base of each tongue. In the circumferential direction from the end of the cut By making a branch cut,
Each of the tongues has a flexible portion that performs an upward reaction with the end portion of the cut as a fulcrum and a flexible portion that performs an upward reaction with the connecting portion as a fulcrum. and wherein the suction small holes is configured to be closed each tongue of each tongue is opened suction small holes and away from the strainer bottom plate on the non-return packing at pump stop is close to the strainer bottom plate on To make a residual water treatment pump. 2. A non-return packing mounted on a strainer bottom plate of a residual water treatment pump, wherein a radial cut is formed from a central perforated portion of an elastic thin plate having a peripheral portion formed on an annular mounting surface to near the mounting surface. By dividing into a plurality of tongue pieces, and forming a branch-like cut which moves in the circumferential direction from the end of the cut so as to leave a narrow connection portion at the root of each tongue piece. The reverse of the residual water treatment pump, wherein each tongue has a flexible portion performing an upward reaction with the end portion of the tongue as a fulcrum and a flexible portion performing an upward reaction with the connecting portion as a fulcrum. Stop packing.