JP2001271799A - Removable structure of removable type submerged pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removable structure of a removable type submerged pump capable of making the depth dimension small so as to be installed even within a narrow manhole. SOLUTION: The inner circumference at the upper edge of a pump casing 3 having a discharge port 2 projected from the side is formed in a cone-shaped inclined surface 4a to form a vessel standing part A, the outer circumference at the lower edge of a oil casing 9 directly under a submerged motor 8 is formed in a conical inclined surface 4b facing the cone-shaped inclined surface 4a to form a removable part B, an engaging piece 7b installed in the removable part B is slidably engaged with an elevating guide 7a standing within the vessel, and when the removable part B is lowered, the conical inclined surface 4b is pressure-fit to the cone-shaped inclined surface 4a to make the operation of the removable submerged pump possible, and when the removable part B is raised, the fitting state is released to expose an impeller 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable submersible pump installed in a manhole or the like.

[0002]

2. Description of the Related Art Conventionally, when a detachable submersible pump is mounted in a manhole, as shown in FIGS. 4 and 5, an engaging element 7'b is attached to an elevating guide 7'a provided upright in a tank. At the lower limit of the detachable submersible pump P which descends by engaging the flange F1 of the side opening type pump discharge port 2'a.
The locking claw f1 provided on the upper edge locks to the upper edge f2 of the side opening type water supply port flange F2 of the discharge bend 2'b, so that the side opening type pump discharge port and the side opening type water supply port have a flange. The surfaces of F1 and F2 abut against each other, and when the detachable submersible pump P rises, the locking claw f1 is separated from the upper edge f2 of the water inlet flange F2, and the two flanges F1 and F2 are separated.

Since the pump discharge port 2'a and the discharge bend 2'b are separated from each other via the flanges F1 and F2, the depth of the pump installed in the manhole becomes large. On the other hand, the diameter of manholes has also been decreasing in recent years, and as is well known, manholes in which a detachable submersible pump is installed are provided with steps S ′... S ′ for workers to go up and down during installation and inspection. , Protruding from the upper part to the lower part of the wall surface. Therefore, the front and rear diameters in the narrow manhole are further narrowed by the protruding steps S ′... S ′, and the size of the installed pump is also restricted. Further, as described above, since the side-open type pump discharge port and the water supply port only abut on the vertical surfaces of the flanges F1 and F2 only by the engagement of the engagement claws f1, the engagement surface is not provided. The working gravity is insufficient, and the pump will leak from the abutment surface during operation. In order to prevent the pressure leakage, a weight W is attached to the rear end of the pump casing 3 '.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the depth of the pump so that the pump can be installed even in a narrow manhole. It is an object of the present invention to provide a detachable submersible pump detachable structure which does not cause the problem.

[0005]

In the detachable structure of the detachable submersible pump according to the present invention, an upper surface of a pump casing having a suction port on a lower surface and a discharge port led out from a side is opened, and the inner periphery thereof is formed as a cone-shaped inclined surface. To form a permanent part in the tank, and form an outer periphery of the lower edge of the oil casing formed immediately below the underwater motor on a conical inclined surface opposite to the cone-shaped inclined surface to form a extractable portion. An engaging element attached to the detachable portion is slidably engaged with an elevating guide provided upright in the tank to constitute an elevating mechanism. When the extractable portion descends, the cone-shaped inclined surface and the cone are formed by the weight thereof. The upper opening of the pump casing is closed by the lower wall of the oil casing, and the conical inclined surface is separated from the cone-shaped inclined surface when the extractable portion is raised. Opening top And configured to be restored to.

[0006]

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

A is a permanent part in the tank to which the detachable structure of the present invention is applied. The upper part of the pump casing 3 having the suction port 1 on the lower surface and the discharge port 2 extending from the side is opened. Its inner periphery is formed as a cone-shaped inclined surface 4a, and is fixed to the tank bottom by a leg 5 guided from the pump casing 3. Reference numeral 6 denotes a discharge conduit connected to the upper end of the discharge port 2, and reference numeral 7a denotes an elevating guide provided upright in the tank, and it is preferable to use an equilateral angle steel. S... S are steps for raising and lowering the worker at the time of installation and inspection of the pump, and are protruded at appropriate intervals from above to below the manhole wall surface. B is a extractable portion to which the detachable structure of the present invention is applied, and is a conical inclined surface facing the cone-shaped inclined surface 4a on the outer periphery of a lower edge of an oil casing 9 formed immediately below the underwater motor 8. 4b, the impeller 12 is mounted on a rotating shaft 11 guided through the lower wall 10 of the oil casing 9, and the lower wall of the oil casing 9 is Will also serve as the upper wall 13. Reference numeral 7b denotes an engaging element attached to the extractable portion, and slidably engages with the elevating guide 7a to constitute an elevating mechanism. Reference numeral 14 denotes a hanging chain for lifting operation.

[0008]

When the suspension chain 14 is extended manually or automatically, the extractable portion B descends due to its weight, and the outer peripheral surface of the lower edge of the oil casing 9 and the inner peripheral surface of the upper edge of the pump casing 3 have a thrust. The lower casing 10 of the oil casing 9 forms the upper wall 13 of the pump casing 3 by the action, and the detachable submersible pump is in an operable state. Gravity effectively acts on the fitting surface with B, thereby preventing pressure leakage during operation. Further, if the suspending chain 14 is pulled and the extractable portion B is pulled up against the gravity, it is separated from the permanent portion A in the tank, and the extractable portion B can be easily taken out of the tank. Only the non-movable portion remains on the tank bottom, and the movable portion such as the impeller 12 is completely exposed from the lower surface of the oil casing lower wall 10. The engaging elements 7b, 7b slide along the elevating guide 7a during the above-described elevating operation. As described in the embodiment, the engaging elements 7b, 7b are lifted by the elevating guide 7 using an equilateral angle steel.
If the structure is such that it engages from both sides in the opposite direction, the extractable portion B can be used even if there is only one elevating guide 7a.
No horizontal run-out occurs, and it is possible to accurately lower to a predetermined fitting position with the permanent part A in the tank, and the lifting is performed smoothly.

[0009]

According to the present invention, unlike the conventional detachable structure in which the pump discharge port and the discharge bend are separated from each other at a vertical plane via a flange, the detachable structure of the present invention provides the outer periphery of the lower edge of the oil casing and the upper part of the pump casing. Since the structure is such that the inner circumference of the edge is separated from the inner circumference by an inclined surface, there is an advantage that the depth dimension of the pump can be reduced. Therefore, it is possible to cope with the tendency of the manhole diameter to be reduced in recent years, and if the manhole diameter is the same, it is possible to install a pump one rank larger than the conventional one. And since gravity effectively acts on the removable surface, there is no pressure leakage during operation, and when lifting the extractable part, the movable parts such as the impeller are exposed so that impurities can be easily removed. It is convenient for maintenance.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part of a detachable submersible pump provided with the detachable structure of the present invention, showing a state where a removable part is fitted to a permanent part in a tank.

FIG. 2 is a longitudinal sectional side view of a main part of a detachable submersible pump having the detachable structure of the present invention, showing a state in which a removable part is detached from a permanent part in a tank.

FIG. 3 is an enlarged plan view of an engagement portion between an elevating guide and an engagement element in FIGS. 1 and 2;

FIG. 4 is a side view of a detachable submersible pump having a conventional detachable structure, showing a state in which the detachable submersible pump is engaged with a discharge bend.

FIG. 5 is a side view of a detachable submersible pump having a conventional detachable structure, showing a state in which the detachable submersible pump is detached from a discharge bend.

[Explanation of symbols]

 A Permanent portion in tank B Extractable portion 1 Suction port 2 Discharge port 3 Pump casing 4a Conical inclined surface 4b Conical inclined surface 7a Elevating guide 7b Engagement member 8 Underwater motor 9 Oil casing 10 Lower wall

Claims (1)

[Claims] An upper surface of a pump casing having a suction port on a lower surface and having a discharge port drawn out from the side is opened, and an inner periphery thereof is formed as a cone-shaped inclined surface to form a permanent part in a tank. The outer periphery of the lower edge of the oil casing formed immediately below is formed as a conical inclined surface facing the cone-shaped inclined surface to form a extractable portion, and an engaging element attached to the extractable portion is set up in the tank. The lifting mechanism is constituted by slidably engaging with the provided lifting guide, and when the extractable portion descends, the cone-shaped inclined surface and the cone-shaped inclined surface are fitted in a press-fit manner due to the weight thereof so that the pump is pressed. The upper opening of the casing is closed by the lower wall of the oil casing, and when the extractable portion is raised, the conical inclined surface is separated from the cone-shaped inclined surface so that the upper surface of the pump casing is restored to the open state. Characterized, removable water Desorption structure of middle pump.