JP2002276584A - Submerged pump and check packing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submerged pump and a check packing thereof capable of installing a check valve in a current submerged pump provided with no space for a reverse flow preventing mechanism and capable of securely preventing the reverse flow of the water inside of a drain piping when stopping the operation of the pump. SOLUTION: An elastic thin plate check packing formed into an annular installation surface 8 at a peripheral part thereof and formed with several tongue pieces 11 divided by radial cut is installed in a peripheral part of a delivery port 4, and bridge body 6 to be tightly brought in contact with the edge of each tongue piece 11 is provided from a back surface. When driving the pump, each tongue piece 11 is separated from the bridge body 6 to open delivery port 4, and when stopping the pump, each tongue piece 11 is tightly brought in contact with the bridge body 6 to seal the delivery port 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

[Prior art and its problems] When the submersible pump is stopped,
In order to prevent the water in the drainage pipe from flowing back, it has been conventionally practiced to install a backflow prevention mechanism such as a ball check valve in the discharge pipe. However, in a submersible pump of the type that fits a rubber hose to the hose coupling,
It is extremely difficult to secure a space for installing such a backflow prevention mechanism.

It has also been proposed to provide a check valve between the suction cover and the strainer bottom plate. However, in order to enable drainage at an ultra-low water level, the pump suction port opening position was set as low as possible, even if a check valve was installed at the above position, the check valve was opened. Is not secured in the vertical direction.

[0004]

An object of the present invention is to provide a submersible pump of a type in which a rubber hose is fitted to a hose coupling or a submersible pump used for residual water treatment at an extremely low water level. , A submersible pump and its non-return packing.

[0000]

A submersible pump according to the present invention is provided with a non-return packing around a discharge port so that a discharge port led out of a pump volute and a hose coupling or a discharge pipe are conducted through a non-return packing. Wherein the check gasket is divided into a plurality of tongue pieces by making a radial cut from a central portion of an elastic thin plate having a peripheral portion formed on an annular mounting surface to near the mounting surface. Each of the tongues has a flexible portion that performs an upward reaction with the end of the cut as a fulcrum, and a backing member that is in close contact with the edge of each tongue is provided on the back surface of the check packing. When the pump is driven, the tongues of the non-return packing are separated from the support and the discharge port is opened. When the pump is stopped, the edges of the tongues are in close contact with the support and the discharge port is closed. did. Further, the packing according to the present invention is a non-return packing mounted on a peripheral portion of a discharge port of a submersible pump, and a peripheral portion is formed from a central portion of an elastic thin plate formed on an annular mounting surface to near the mounting surface. Dividing into a plurality of tongue pieces by applying a radial cut across the tongue pieces, and making a branch-like notch moving in the circumferential direction from the end of the cut in such a manner that a narrow connection portion is provided at the base of each tongue piece. Thus, each tongue piece is configured to have 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.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings.

Reference numeral 1 denotes a pump swirl chamber, and reference numeral 2 denotes a suction cover constituting a lower bottom portion of the pump swirl chamber 1, and a suction port 3 is formed at a central portion. Reference numeral 4 denotes a discharge port derived from the pump swirl chamber 1, and reference numeral 5 denotes a hose coupling or a discharge pipe which is provided upright at the discharge port 4 via a later-described support member 6 and a check packing 7. The non-return packing attached to the periphery of the discharge port 4 is made of an elastic thin plate such as rubber.
The peripheral portion is formed in an annular mounting surface, and radial cuts 10... 10 extending from the central portion to near the mounting surface 8 are made to divide into a plurality of tongue pieces 11.・
By making the cuts 13, 13 extending in the circumferential direction from the end of the cut 10 in the circumferential direction from the end of the cut 10 so as to leave the narrow connecting portion 12 at the root of 11, the end 13 e of the cut 13, 13 e Each of the tongue pieces 11,... 11 has a flexible portion 11a, 11a that performs an upward reaction with the supporting point as a fulcrum, and a flexible portion 11b that performs an upward reaction with the connecting portion 12 as a fulcrum. The supporting member attached to the back surface of the check packing 7 is in close contact with the edges of the tongues 11 along the radial cuts 10 and the branch cuts 13 and the annular mounting of the check packing 7. It is formed so that a surface can be supported. 9 fastening bolts.

[0008]

[Action] is when the pump is stopped as shown in FIG. 1 each tongue 11 -
Since the edge of 11 is in close contact with the support 6, the discharge port 4 and the hose coupling (or discharge pipe) 5 are in a state where conduction is cut off. However, when the pump is started, the tongue pieces 11,... 11 cause an upward reaction, separate from the support body 6 as shown in FIG. 2, and the discharge port 4 and the hose coupling (or discharge pipe) 5 are brought into conduction, so that the suction Mouth 3
The water that is sucked in is discharged through the pump swirl chamber 1
Emitted from 4. The tongue pieces 11 are separated from each other by the upward reaction with the end of the radial cut 10 as a fulcrum. The checkout gasket 7 is formed as shown in FIG. If it cuts, the branch-like cut 13,
13, flexible portions 11a having the end portions 13e, 13e as fulcrums,
The upward reaction of 11a and the upward reaction of the flexible portion 11b with the connecting portion 12 as a fulcrum are performed together, and the opening function of the discharge port 4 can be further enhanced. When the pump operation is stopped at the completion water level of the drainage, the pressure of the return water in the drainage pipe line causes the tongues 11.
As shown in (5), since the discharge port 4 is closed closely on the support body 6, the backflow preventing function works.

[0009]

According to the present invention, a check valve can be installed even in a conventional submersible pump which does not have a space for installing a backflow prevention air mechanism, and it is ensured that water in the drainage pipe line flows backward when the pump is stopped. Can be prevented.

[Brief description of the drawings]

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

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

FIG. 3 is a plan view of the check packing of the present invention.

FIG. 4 is a plan view of a support member attached to the non-return packing according to the present invention.

FIG. 5 is a plan view of the check packing of the present invention in a state in which a backing member is attached to the back surface.

FIG. 6 is a vertical sectional side view showing the relationship between the check packing and the tongue when the tongue piece is upwardly actuated.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 pump swirl chamber 2 suction cover 3 suction port 4 discharge port 5 hose coupling or discharge pipe 6 support member 7 check packing 8 annular mounting surface 10 radial cut 11 tongue piece 11a branch end of cut-off Flexible part 11b that performs an upward reaction 11b Flexible part that performs an upward reaction with the connecting part as a fulcrum 12 Connecting part 13 Branch cut 13e End of branch cut

Claims (2)

[Claims] 1. A submersible pump having a non-return gasket mounted around a discharge port so that a discharge port led out of a pump swirl chamber and a hose coupling or a discharge pipe are conducted through a non-return gasket. The above-mentioned non-return packing is divided into a plurality of tongue pieces by making a radial cut from a central portion of an elastic thin plate having a peripheral portion formed on an annular mounting surface to a portion near the mounting surface, and a fulcrum is provided at the end of the cut. Each of the tongues has a flexible portion that performs an upward reaction, and a backing member is provided on the back surface of the check packing so as to be in close contact with the edge of each tongue. Wherein each of the tongues is separated from the support and the discharge port is opened, and when the pump is stopped, the edge of each tongue is in close contact with the support and the discharge port is closed. pump. 2. A non-return gasket mounted around a discharge port of a submersible pump, wherein a radial cut from a central portion of an elastic thin plate having a peripheral portion formed on an annular mounting surface to near the mounting surface. To form a plurality of tongue pieces, and to form a branch-like notch that moves in the circumferential direction from the end of the notch so as to leave a narrow connecting portion at the base of each tongue piece. Non-return packing of a submersible pump, characterized in that each tongue has a flexible portion that performs an upward reaction with the end portion of the fulcrum as a fulcrum and a flexible portion that performs an upward reaction with the connecting portion as a fulcrum. .