JPH0578996U - Submersible axial pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To construct a submersible axial flow pump that has high pump efficiency, is simple in structure, and can be manufactured at low cost by using two axial flow vanes cooperating in a common cylindrical casing. [Structure] In a tubular casing 1, a water passage 7 is formed on the outer circumference of a first submersible motor 4 facing the suction port 2 and a second submersible motor 6 facing the discharge port 3, and both submersible motors 4, 6 are formed. The rotating shafts 5, 5 which are led out from each other in such a manner as to rotate in opposite directions are arranged so as to rotate in opposite directions.
The first axial flow vane 8 and the second axial flow vane 9 are mounted on the shaft 5, respectively, and the blade plates of the two axial flow vanes 8 and 9 are arranged in opposite directions. By driving the both submersible motors 4 and 6, the pump action of sucking water from the suction port 2 and discharging from the discharge port 3 through the water passage 7 is performed cooperatively by the both axial flow vanes 8 and 9.

Description

[Detailed description of the device]

[0001]

[Technical field of invention]

 The present invention relates to a submersible axial flow pump using two axial flow vanes.

[0002]

[Prior Art]

 A multi-stage centrifugal pump using two or more impellers is known in order to improve pump efficiency. On the other hand, in the propulsion device of a ship, the technical idea is to increase the forward thrust efficiency by generating a strong backward water flow by the two propellers with the vane plates twisting and rotating differently from each other. Widely known.

[0003]

[Problems to be solved by the device]

 In the above-mentioned multi-stage pump, a spiral casing is provided for each impeller, and a water passage for connecting the swirl chambers in each spiral casing needs to be bent, which makes the structure complicated. There is a pity that the cost will be high. Moreover, even if the possibility of applying the above-mentioned propulsion device principle to an axial flow pump can be expected, a specific structure is specifically required to make it effective as an axial flow pump. Become.

An object of the present invention is to apply the above-mentioned principle of a propeller to a submersible pump to construct a submersible axial pump having high pump efficiency, simple structure, and low cost. is there.

[0005]

[Means for solving the problem]

 In the submersible axial pump according to the present invention, the first submersible motor facing the suction port and the second submersible motor facing the discharge port in the cylindrical casing having one end as the suction port and the other end as the discharge port. Water channels are formed on the outer circumference so that the rotating shafts guided in opposite directions from both submersible motors rotate in opposite directions. The first axial blade and the second axial blade are attached to these rotating shafts, respectively. In addition, the twisting directions of the blade plates of these axial flow blades are opposite to each other.

[0006]

[Action]

 When both submersible motors are driven with the suction port open to the water, the first axial flow vane and the second axial flow vane rotate in opposite directions, but they both rotate in the same direction. Since they are in opposite directions, the pump action is performed cooperatively by both, and the water sucked from the suction port is discharged from the discharge port through the water passages on the outer periphery of both submersible motors.

[0007]

【Example】

 Hereinafter, description will be given with reference to the drawings of the embodiments.

Reference numeral 1 is a cylindrical casing having one end as a suction port 2 and the other end as a discharge port 3, and 4 is a cylindrical casing 1 in which the outlet side of a rotary shaft 5 is housed in the cylindrical casing 1 so as to face the suction port 2. 1 submersible motor, 6 is a second submersible motor housed in the tubular casing 1 so as to face the discharge port 3 and 7 is attached to the outer periphery of both submersible motors 4, 6 so as to pass from the suction port 2 to the discharge port 3. The formed water channel, 8 is a first axial flow blade mounted on the rotary shaft 5 of the first submersible motor 4, and 9 is a second axial flow blade mounted on the rotary shaft 5 of the second submersible motor 6. The axial directions of the biaxial blades 8 and 9 are opposite to each other.

When the submersible axial pump of the present invention is used, for example, the suction port 2 is opened in the water tank, and a discharge conduit (not shown) is connected to the discharge outlet 3 to guide it to a predetermined location outside the tank. When the both submersible motors 4 and 6 are driven, the first axial flow vane 8 rotates in a fixed direction, and at the same time, the second axial flow vane 9 rotates in the opposite direction to the above. Since the twist of the vane plate is also in the opposite direction to that of the first axial flow vane 8, the pump action of sucking water from the suction port 2 and discharging from the discharge port 3 through the water passage 7 is cooperated by the biaxial flow vanes 8 and 9. It will be carried out in a timely manner to improve pump efficiency. Then, the water is sent from the discharge port 3 to a predetermined place through the discharge conduit.

[0010]

In the submersible axial flow pump of the present invention, the pump efficiency is increased by the cooperative operation of the first axial flow vane 8 and the second axial flow vane 9. It was confirmed by the inventor's experimental results that the pump efficiency is remarkably high as compared with the case of using a single axial flow vane and the case of rotating two axial flow vanes in the same direction. Moreover, unlike the conventional multi-stage centrifugal pump, it is not necessary to provide a spiral casing for each impeller and to bend a water passage for connecting the swirl chambers in each spiral casing, and the structure is simple. It has the advantage that it can be manufactured at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a vertical sectional side view of essential parts of the submersible axial flow pump of the present invention.

[Explanation of symbols]

 1 Cylindrical casing 2 Suction port 3 Discharge port 4 First submersible motor 5 Rotation shaft 6 Second submersible motor 7 Water channel 8 First axial flow blade 9 Second axial flow blade

Claims (1)

[Scope of utility model registration request] In the cylindrical casing (1) having one end as a suction port (2) and the other end as a discharge port (3), a first submersible motor (4) and a discharge port (3) facing the suction port (2) A water channel (7) is formed on the outer periphery of the second submersible motor (6) facing backwards, and the rotary shafts (5) and (5) derived from the two submersible motors (4) and (6) in opposite directions are directed in opposite directions. The rotating shafts (5) and (5) are respectively mounted with a first axial flow vane (8) and a second axial flow vane (9), and
A submersible axial flow pump configured such that the vane plates of the biaxial flow vanes (8) and (9) are twisted in opposite directions.