JPH08200278A - Submersible pump seal member - Google Patents

Abstract

(57) [Summary] [Purpose] The structure between the inlet of the connecting pipe and the outlet of the submersible pump is kept simple and stable in a watertight state for a long period of time. [Constitution] When the submersible pump is lowered into the pit and the discharge port 32 of the submersible pump is connected to the inlet 41b of the connecting pipe 41 arranged in the pit, the tongue portion 3 of the seal member 34 is
A substantially flat end surface on the outer side of 4a is the inlet 4 of the connecting pipe 41.
It is pressed against the end face around 1b. Submersible pump outlet 3
When the liquid is ejected from No. 2, the ejection pressure causes the tongue portion 34a protruding inward of the seal member 34 to come into pressure contact with the end face around the introduction port of the connection pipe, further improving the watertight state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump which can be attached to and detached from a connecting pipe installed in a pit such as a manhole. When the discharge ports of the above are connected, the present invention relates to a seal member that holds both of them in a watertight state.

[0002]

2. Description of the Related Art In manholes through which sewage flows,
A submersible pump is installed to pump up the sewage stored in the manhole and re-flow it into the sewage. This submersible pump usually has a motor arranged in the upper part and a pump casing arranged in the lower part, and an impeller arranged in the pump casing is rotated by the motor to generate liquid in the pump casing. Is being sucked. The liquid sucked into the pump casing is
It is discharged from a discharge port provided on the side of the pump casing.

In such a submersible pump, it is possible to install the submersible pump in the manhole even if the worker does not work in the small manhole. That is, in the manhole, a discharge conduit is installed vertically in advance, and a connection pipe installed horizontally is connected to the lower end of the discharge conduit. Then, the submersible pump suspended by the chain is lowered along the guide rails arranged vertically along the side wall of the manhole and automatically connected to the connecting pipe installed in the manhole. ing.

The discharge port of the submersible pump is open to the side, and the connecting pipe arranged in the manhole is directed toward the side so as to be connected to the discharge port of the submersible pump. It is open. The outlet of the submersible pump and the inlet of the connecting pipe are attached and detached by an attaching and detaching mechanism.

The attachment / detachment mechanism between the submersible pump and the connecting pipe is usually composed of a guide rib provided above the inlet of the connecting pipe so as to project upward, and an attaching / detaching portion provided outside the upper part of the outlet of the submersible pump. And have. The attachment / detachment portion is provided with a groove portion into which the guide rib is fitted and which opens downward.

When the submersible pump descends in the pit, the groove portion of the attaching / detaching portion provided in the submersible pump fits into the guide rib of the connecting pipe installed in the pit. A seal member is interposed between the outlet of the submersible pump and the inlet of the connecting pipe, and when the submersible pump is attached to the connecting pipe by the attachment / detachment mechanism, the moment due to the weight of the submersible pump and the guide rib Acting mainly on the fitting portion with the attachment / detachment portion, the discharge port of the submersible pump and the introduction port of the connection pipe are pressed against each other in a watertight state.

Various methods have been proposed for the structure in which the discharge port of the submersible pump and the inlet port of the connecting pipe are kept watertight. For example, in Japanese Patent Laid-Open No. 4-269396,
Disclosed is a configuration in which a sealing member provided with a tongue portion that extends in an inclined state toward an end surface around an introduction port of a connection pipe holds a tongue portion in a rotatable state at a peripheral portion of a discharge port. There is. Further, JP-A-5-126083 and JP-A-5-126084 disclose a configuration in which a reversible tube is arranged between a discharge port of a submersible pump and a connecting pipe.

[0008]

[Patent Document 1] Japanese Patent Application Laid-Open No. 4-26939
In the configuration disclosed in Japanese Patent No. 6, it is necessary to hold the tongue portion of the seal member in a rotatable state, which causes a problem that a ring-shaped spring or the like is required. Moreover, since the tongue portion is not pressed against the end face around the inlet of the connecting pipe when the submersible pump is not driven, there is a problem that the watertightness is not secured.

In the configurations disclosed in Japanese Patent Laid-Open Nos. 5-126083 and 5-126084, the tube enters the inside of the connecting pipe due to the driving of the submersible pump and does not return to the original state. Therefore, when pulling up the submersible pump for maintenance of the submersible pump or the like, the tube that has entered the connecting pipe may be damaged by the end surface of the connecting pipe. For this reason, there is a problem that the durability of the tube is significantly impaired.

The present invention solves such a problem, and its purpose is to provide a simple structure between the inlet of a connecting pipe installed in a pit such as a manhole and the outlet of a submersible pump. It is therefore an object of the present invention to provide a seal member for a submersible pump that can be stably kept in a watertight state for a long period of time.

[0011]

The seal member for a submersible pump according to the present invention is arranged around the discharge port of a submersible pump that discharges liquid from a discharge port that opens laterally. By descending in the pit, when the discharge port is attached to the inlet opening to the side of the connecting pipe installed in the pit, the discharge port and the inlet are sealed in a watertight state. The sealing member is arranged on the inlet side of the connecting pipe so as to project inwardly over the entire circumference, and the outer end face is made substantially flat so as to be pressed against the end face around the inlet. It is characterized by having a tongue, which achieves the above object.

[0012]

With the sealing member for the submersible pump of the present invention, when the submersible pump is lowered into the pit and the discharge port of the submersible pump is connected to the inlet of the connecting pipe arranged in the pit,
The outer flat end face of the tongue is pressed against the end face around the inlet of the connecting tube. When the liquid is discharged from the discharge port of the submersible pump, the discharge pressure causes the inwardly protruding tongue portion to be pressed against the end face around the introduction port of the connection pipe, further improving the watertight state.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway side view showing an example of the submersible pump of the present invention. The submersible pump A is installed and used in a manhole in order to pump up sewage containing, for example, dirt and foreign substances. The submersible pump A includes a pump casing 10 in which an impeller 11 is arranged, and a motor 2 arranged above the pump casing 10.
0.

The motor 20 has a cylindrical stator casing 21 having a vertical axis, and a rotor shaft 2 inserted through the axial center of the stator casing 21.
3 has a rotor 22 attached thereto, and a stator 24 attached to the inner peripheral surface of the stator casing 21 so as to surround the rotor 22.

A disc-shaped bearing bracket 25 is fitted to the lower end of the stator casing 21. The bearing bracket 25 covers the lower end surface of the stator casing 21 in a state where an appropriate space is formed around the rotor shaft 23 with the upper surface of the lower pump casing 10. The lower end of the rotor shaft 23 is
Insert the bearing bracket 25 to insert the bearing bracket 2
5 passes through the space between the pump casing 10 and the pump casing 10, and extends inside the pump casing 10. The rotor shaft 23 includes a bearing 26 and a bearing bracket 25.
It is rotatably supported by.

A head cover 50 having an electric system housed therein is attached to the upper side of the stator casing 21. On the upper part of the head cover 50, so that the submersible pump A can be held by a hand when carrying it,
A grip portion 51 is provided in which flat plates that extend linearly in the horizontal direction are arranged in a vertical state so that the thickness direction is the horizontal direction. Then, a through hole 52 penetrating in the horizontal direction is formed in the center of the handle 51, and the lower end of a chain (not shown) for suspending the submersible pump A is locked in the through hole 52. It is supposed to be done.

The pump casing 10 is made of plastic and is vertically separable.
The periphery of the rotor shaft 23 located between the pump casing 10 and the bearing bracket 25 is sealed by a mechanical seal 27.

The lower end of the rotor shaft 23 enters the inside of the pump casing 10, and the impeller 11 is attached to the lower end. Pump casing 1
The inside of the 0 impeller 11 is housed as a pump chamber 19, and the pump chamber 19 is connected to a discharge pipe line 14 that linearly extends outward.

A suction port 15 is formed on the bottom surface of the pump casing 10 so as to face the rotor shaft 23, and the pump casing 1 is provided at a plurality of positions in the circumferential direction.
A plurality of legs 17 are provided for lifting the bottom surface of 0.

The discharge pipe line 14 provided in the pump casing 10 has a front end portion curved upward, and a connection port 14a opening upward is provided on the front end surface thereof. The connection conduit 30 is attached to the connection port 14a via a packing 41.

The connecting conduit 30 is horizontal except for the base end, and the base end is curved downward at 90 degrees. An opening 31 that opens downward is provided on the end surface of the base end, and the opening 31 is provided at the connection port 14a and the packing 41.
It is attached integrally via. A discharge port 32, which is open to the outside laterally, is formed on the tip end surface of the connecting conduit 30.
Is provided. A flange portion 33 is provided around the discharge port 32.
An attachment / detachment portion 35 extending outward is provided at an upper end portion of 3. Inside the flange portion 33, there is provided an annular recessed groove portion 33a that is open toward the inner peripheral side and the outside side, and in this recessed groove portion 33a, the annular seal member 3 is provided.
4 is attached.

FIG. 2 shows the attaching / detaching portion 35 of the submersible pump A.
FIG. 3 is an enlarged sectional view of an end portion of the connection pipe 41, FIG. 3 is an enlarged sectional view of a main portion thereof, and FIG. 4 is a sectional view of the annular seal member 34. The ring-shaped sealing member 34 is made of elastic rubber or the like and has a ring-shaped holding member 37 embedded therein. The holding member 37 is made of metal or the like, and the end portion of the ejection port 32 opposite to the outer side is bent inward.

The seal member 34 arranged in the recessed groove portion 33a of the flange portion 33 has a recessed inner peripheral portion at the central portion in the axial direction, and a portion corresponding to the outer end face of the recessed groove portion 33a. , A tongue portion 34a protruding inward. The tongue portion 34a has an outer end surface with the flange portion 33a.
Is substantially flat along the end face of the, and a pair of protrusions 34b that are continuous over the entire circumference are provided at the inner peripheral end of the end face.

The submersible pump A is designed to be attached to and detached from the end of the connecting pipe 41 arranged horizontally on the bottom surface of the manhole by a detaching mechanism. It constitutes a part. Connection pipe 41
Are horizontally supported on the support base 40, and one end thereof is curved upward. Then, on the end face of the curved end portion, the lead-out port 41 is opened by opening upward.
a is provided, and the outlet 41a is connected to the lower end of the discharge conduit 61 vertically arranged along the peripheral surface of the manhole.

At the other end of the connecting pipe 41 supported horizontally on the support base 40, there is provided an inlet 41b that is open to the side, and the end face around this inlet 41b is provided. A tongue portion 34 of a seal member 34 arranged in a flange portion 33 of the connection conduit 31 of the submersible pump A
It is pressed against the outer end surface of a and is reliably sealed by each protrusion 34b.

In the connecting conduit 30 of the submersible pump A,
A slider portion (not shown) that engages with and slides on the guide rail 62 vertically supported in the manhole is provided. By sliding the slider portion along the guide rail 62, the submersible pump A It is designed to go up and down in the manhole. When the submersible pump A is lowered along the guide rail, the discharge port 32 of the submersible pump A is automatically connected to the introduction port 41b of the connection pipe 41 provided at the bottom of the manhole by the attachment / detachment mechanism. .

The attachment / detachment portion 35 extends long in a direction orthogonal to the axial direction of the connecting conduit 30. Inside the attachment / detachment portion 35, a groove portion 35b extending along the direction is opened downward. It is provided. A screw 35c is fixed to each end of the side edge of the opening of the groove 35b that faces the flange 33, and the head of each screw 35c projects into the groove 35b.

A guide rib 42 is provided above the inlet 41b of the connecting pipe 41 so as to be fitted into the groove 35b of the attachment / detachment portion 35 of the submersible pump A. The guide rib 42 extends long in the same direction as the groove 35b, and the upper end thereof is tapered toward the upper side. The upper surface 42a of the guide rib 42 and the connecting pipe 4
The inclined side surface 42e of the guide rib 42 located on the far side of the introduction port 41b in No. 1 is covered with the guide plate 43. Each screw 35 provided in the groove portion 35b of the attachment / detachment portion 35 of the submersible pump A is provided at a lower portion of each end portion of the portion that covers the inclined side surface 42e of the guide plate 43.
The heads of c are pressed against each other.

When the submersible pump A having such a structure is installed in the manhole, the lower end of the chain is attached to the inside of the through hole 52 of the handle 51 provided on the upper part of the head cover 50, and the chain is attached. By submersible pump A
In a state where the whole is suspended, it is lowered along a guide rail 62 provided on the wall surface of the manhole. Since the motor 20 is heavy, the submersible pump A is in an inclined state so that the discharge port 32 of the connecting conduit 30 is located above. Therefore, the opening portion of the attachment / detachment portion 35 that opens downwardly of the groove portion 35b descends in a state of being inclined upward toward the outside.

When the submersible pump A descends, the submersible pump A
Groove portion 35b of the attachment / detachment portion 35 provided in the connecting conduit 30 of
Is in a state of being fitted to the guide rib 42 of the connecting pipe 41 installed at the bottom of the manhole. At this time, since the submersible pump A is tilted so that the discharge port 32 is located above, the opening of the attaching / detaching part 35 that opens downwardly is the guide rib of the connecting pipe 41. Four
Easily fits to the tip of 2.

In this way, when the submersible pump A is completely lowered, the moment due to the weight of the submersible pump A acts in the direction indicated by the arrow X in FIG.
The head of the screw 35c is in pressure contact with the lower end of the inclined portion of the guide plate 43 that covers the guide rib 42 of No. 1 and the outside of the tongue portion 34a of the seal member 34 that covers the discharge port 32 of the connecting conduit 30. The flat surface is the inlet 41 of the connecting pipe 41.
The end face around b is pressed in a watertight state.

When the submersible pump A is installed in the manhole in this way, the motor 20 of the submersible pump A is driven so that the impeller 11 arranged in the pump casing 10 is integrated with the rotor shaft 23. Will be rotated. As a result, the suction port 15 through the pump casing 10
The liquid around the inside of the pump chamber 19 flows into the pump chamber 19 and
After passing through the inside as a vortex, it passes through the discharge pipe portion 14 and flows into the connection pipe line 30. The liquid flowing into the connecting conduit 30 is discharged from the discharge port 32, flows into the connecting pipe 41, and is discharged into the discharging conduit 61 connected to the connecting pipe 41.

In this case, when the liquid is discharged from the discharge port 32 of the connecting conduit 30, the motor 20 of the submersible pump A tries to float upward due to the reaction force of the discharged liquid. However, since the tongue portion 34a of the seal member 34 arranged around the discharge port 32 is in a state of protruding into the discharge port 32, the tongue portion 34a is connected to the connecting pipe 41 by the liquid to be discharged. Is pressed against the end face around the inlet 41a. As a result, the discharge port 3 of the connecting conduit 30
The seal member 33 that covers 2 is the introduction port 41b of the connection pipe 41.
There is no possibility that the liquid discharged from the discharge port 32 of the connecting conduit 30 leaks to the outside while maintaining the state of being pressed against the end surface of the.

When the submersible pump A is to be inspected, the entire submersible pump A is pulled up by pulling up the chain. When the submersible pump A is pulled up by the chain, the outer end face of the tongue portion 34a of the seal member 34 arranged around the discharge port 32 slides along the end face around the introduction port 41b of the connection pipe 41. Therefore, the seal member 34 is not likely to be damaged. Therefore, the durability of the seal member 34 is significantly improved.

[0036]

As described above, the seal member for a submersible pump according to the present invention has a simple structure because the tongue portion whose outer end surface is substantially flat is provided so as to protrude in the inner circumferential direction. And, it can be easily attached around the discharge port. Moreover, the tongue does not have a risk of being damaged when the submersible pump is attached to or detached from the connecting pipe, and the durability is remarkably improved. Can be held in a state.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a state in which a submersible pump provided with a seal member of the present invention is connected to a connecting pipe in a manhole.

FIG. 2 is a cross-sectional view of a connecting portion between a connecting pipe line and a connecting pipe of the submersible pump.

FIG. 3 is an enlarged cross-sectional view of a main part thereof.

FIG. 4 is a sectional view of an annular seal member.

[Explanation of symbols]

 A Submersible Pump 10 Pump Casing 11 Impeller 14 Discharge Pipeline 15 Suction Port 19 Pump Chamber 20 Motor 22 Rotor 23 Rotor Shaft 24 Stator 30 Connection Pipeline 33 Flange 34 Seal Member 34a Tongue 34b Protrusion 35 Attachment / Detachment Part 37 Holding Member 41 Connection pipe 41b Inlet 42 Guide rib

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuji Itani 6-10107 Takino-cho, Nishinomiya-shi, Hyogo Shinmeiwa Industrial Co., Ltd. Development Technology Headquarters (72) Riki Takebe 1 Shinmeiwa-cho, Takarazuka-shi, Hyogo No. 1 Shinmeiwa Industrial Co., Ltd. Industrial Machinery Systems Division (72) Inventor Katsunori Noda 6-107 Takino-cho, Nishinomiya-shi, Hyogo Shinmeiwa Industrial Co., Ltd.

Claims (1)

[Claims] 1. A submersible pump that discharges liquid from a discharge port that opens to the side, is arranged around the discharge port, and the submersible pump descends in a pit,
A seal member that seals a watertight state between the discharge port and the introduction port when the discharge port is attached to the introduction port opening to the side of the connecting pipe installed in the pit, It is arranged on the inlet side of the connecting pipe so as to project toward the entire circumference in one direction, and has a tongue portion whose outer end face is substantially flat so as to be pressed against the end face around the inlet port. Submersible pump seal member.