JP4577940B2 - Desorption structure of detachable submersible pump - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a detachable structure of a detachable submersible pump installed in a manhole or the like.
[0002]
[Prior art and its problems]
Conventionally, as shown in FIGS. 4 and 5, the detachable submersible pump is installed in a manhole. The detachable submersible pump is lowered by engaging the engaging guide 7′b with the elevating guide 7′a standing in the tank. At the lowering limit of the submersible pump P, the locking claw f1 provided on the upper edge of the flange F1 of the side opening pump discharge port 2′a is the upper edge f2 of the side opening type water supply flange F2 of the discharge bend 2′b. The side opening type pump discharge port and the side opening type water supply port abut each other at the flanges F1 and F2, and when the detachable submersible pump P is raised, the locking claw f1 is located above the water supply port flange F2. The flanges F1 and F2 are separated from the edge f2.
[0003]
Since the pump discharge port 2′a and the discharge bend 2′b are separated from each other through the flanges F1 and F2, the depth of the installed pump in the manhole is increased. On the other hand, the manhole diameter has also been decreasing in recent years. As is well known, the manhole where the detachable submersible pump is installed has steps S ′... S ′ for the operator to move up and down during installation and inspection. , Projecting from the upper part of the wall surface to the lower part. Accordingly, the front and rear diameters in the narrow manhole are further narrowed by the protrusion of steps S ′... S ′, and the size of the installed pump is also restricted. In addition, as described above, the side-opening type pump discharge port and the water supply port only abut on the vertical surface of the flanges F1 and F2 only by the engagement of the engagement claw f1, so The working gravity is insufficient and pressure leakage occurs from the abutting surface during the pump operation. In order to prevent this pressure leakage, a weight W is also attached to the rear end of the pump casing 3 '.
[0004]
OBJECT OF THE INVENTION
The object of the present invention is to reduce the depth of the pump so that it can be installed even in a narrow manhole, and the permanent installation part and the detachable part in the tank are firmly fitted so as not to cause pressure leakage. An object of the present invention is to provide a detachable structure for a detachable submersible pump.
[0005]
[Structure of the invention]
In the detachable structure of the detachable submersible pump according to the present invention, the upper surface is opened above the pumping liquid flow passage portion of the pump casing in which the lower surface has the suction port and the discharge port is led out from the side. the conical inclination formed by the tank to the surface permanent part and without, concave lower edge periphery of the formed oil casing immediately below the water motor therein is formed in a conical shape inclined surfaces opposed to the conical inclined surface A conical inclined surface containing an open-type impeller mounted on the leading end of the rotating shaft guided from the motor is formed as an extractable part, and is attached to the extractable part. The elevating mechanism is configured by slidably engaging an elevating guide installed in the tank, and when the extractable part is lowered, the conical inclined surface and the conical inclined surface are pressed by the weight. Opened on top of pump casing There is closure by an oil casing lower wall, and configured to 抽脱 moiety upper surface of the withdrawal to the pump casing conical inclined surface at the time of rise from the cone-shaped inclined surface of is restored to the open state.
[0006]
【Example】
The embodiment will be described below with reference to FIGS.
[0007]
A is a permanent part in the tank which is an object of implementation of the desorption structure of the present invention, and is higher than the flow path portion of the pumped liquid in the pump casing 3 having the suction port 1 on the lower surface and leading out the discharge port 2 from the side. The upper surface is opened upward, the inner periphery thereof is formed into a cone-shaped inclined surface 4 a, and is fixed to the tank bottom surface by the legs 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 7a denotes an elevating guide erected in the tank. It is desirable to use equilateral angle steel. S... S is a step for the operator to move up and down during installation and inspection of the pump, and is projected from the upper side to the lower side of the manhole wall at appropriate intervals. B is an extractable portion which is an object of implementation of the detachable structure of the present invention, and a conical inclined surface which faces the cone-shaped inclined surface 4a on the outer periphery of the lower edge of the oil casing 9 formed immediately below the submersible motor 8. An open type impeller 12 is mounted and housed at the leading end of the rotating shaft 11 that is guided by the submersible motor 8 through the lower wall 10 of the oil casing 9 in a portion that is formed in 4b and is recessed in the interior. The conical inclined surface 4b is made the extractable part B, and when the extractable part B is lowered, the lower wall of the oil casing 9 also serves as the upper wall 13 of the pump casing 3. Reference numeral 7b denotes an engaging member 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]
[Action]
If the suspension chain 14 is drawn out manually or automatically, the extractable part B is lowered by its weight, and the lower outer peripheral surface of the oil casing 9 and the upper peripheral inner surface of the pump casing 3 are pressed by the thrust action. The upper wall 13 of the pump casing 3 is formed by the lower wall 10 of the oil casing 9, and the detachable submersible pump is ready for operation. Gravity acts effectively on the fitting surface to prevent pressure leakage during operation. Further, if the suspension chain 14 is pulled and the extractable part B is pulled up against gravity, it is detached from the permanent part A in the tank, and the extractable part B can be easily taken out of the tank. Only the non-movable part is left on the tank bottom, and the movable part such as the open type impeller 12 is completely exposed from the lower surface of the lower wall 10 of the oil casing. The engaging elements 7b, 7b slide along the elevating guide 7a during the elevating operation described above. As described in the embodiment, the engaging elements 7b, 7b are formed of the elevating guide 7a using equilateral angle steel. If the structure is such that it engages in the opposite direction from both sides, even if there is only one lifting guide 7a, there will be no lateral vibration in the extractable part B, and a predetermined fit with the permanent part A in the tank. It can be accurately lowered to the position, and the lifting can be performed smoothly.
[0009]
【The invention's effect】
Unlike the conventional detachment structure in which the pump discharge port and the discharge bend are separated from each other on the vertical surfaces via flanges, the detachment structure of the present invention has a lower edge outer periphery of the oil casing and an upper edge inner periphery of the pump casing. Since it is a structure in which it is separated and connected by an inclined surface, there is an advantage that the depth dimension of the pump can be reduced. Accordingly, it is possible to cope with the recent trend of reducing the manhole diameter, and if the manhole diameter is the same, it is possible to install a pump that is one rank larger than the conventional one. Gravity acts effectively on the detachable surface, so there is no pressure leakage during operation, and moving parts such as an open impeller are exposed when the extractable part is pulled up, so that impurities are removed. It is easy and convenient for maintenance.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of an essential part of a detachable submersible pump provided with a detachable structure according to the present invention, and shows a state in which a part that can be extracted 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 provided with a detachable structure according to the present invention, and shows a state in which a detachable part is detached from a permanent part in a tank.
FIG. 3 is an enlarged plan view of an engagement portion between a lifting 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 where the detachable submersible pump is detached from a discharge bend.
[Explanation of symbols]
A Permanent part in the tank B Extractable part 1 Suction port 2 Discharge port 3 Pump casing 4a Cone-shaped inclined surface 4b Conical-shaped inclined surface 7a Lifting guide 7b Encoder 8 Submersible motor 9 Oil casing 10 Lower wall

Claims (1)

An upper surface is opened above the pumping liquid flow passage portion of the pump casing having a suction port on the lower surface and a discharge port is led out from the side, and the inner periphery thereof is formed in a cone-shaped inclined surface, None, the outer periphery of the lower edge of the oil casing formed directly under the submersible motor is formed into a conical inclined surface facing the above cone-shaped inclined surface, and penetrates the lower wall of the oil casing in the recessed portion inside. The conical inclined surface containing the open type impeller attached to the leading end of the rotating shaft guided from the submersible motor is formed as a detachable portion, and the engaging element attached to the detachable portion is a tank. The elevating mechanism is constructed by slidably engaging with the elevating guide standing up in the inside, and when the extractable part is lowered, the conical inclined surface and the cone-shaped inclined surface are fitted in a compressed form by its weight. The top opening of the pump casing is oil casing A detachable submersible pump characterized in that the conical inclined surface is separated from the cone-shaped inclined surface and the upper surface of the pump casing is restored to an open state when closed by the lower wall and when the extractable portion is raised. Desorption structure.

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