JPH0116354B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a pump device installed in a liquid storage tank provided in a moving body such as a ship.

Generally, various submerged pump devices have been proposed for discharging liquid into a tank. Usually, this type of pump device is placed in the bottom of the tank, so it is necessary to fix the pump device to the bottom of the tank and to be able to pull it out from the tank at any time for maintenance and inspection. A safe installation of a power system to drive the pumping equipment and pumping equipment is required.

Conventionally, in this type of pump device, a sealed pipe body is provided to house and guide the pump itself from the top to the bottom of the tank, and the pump suction port is configured to open into the tank at the bottom of the tank. As a result, the suspension means for the pump, the discharge piping, and the power cable are safely housed within the pipe body which is isolated from the liquid reservoir in the tank with a relatively simple structure. However, in this type of pump device, the pipe body has a large diameter structure that can accommodate the entire pump, so a tank with a large storage volume must have a strong structure that can withstand the liquid pressure, and the material used must be The disadvantage is that manufacturing costs increase depending on the selection. In addition, it is necessary to provide an opening/closing means to smoothly open and close the pump suction port at the lower end of the tube, and a fixing means to prevent torsional stress generated in the tube due to rocking, etc. This has the disadvantage that not only the overall configuration becomes complicated, but also the assembly work becomes troublesome, and the construction period and equipment cost increase significantly.

From this point of view, a pump device has been proposed in which the pump itself is directly immersed in the tank and a support for fixing the pump is attached inside the tank to prevent the pump from swinging. However, in tanks that store explosive liquefied gas and keep it under pressure at room temperature or at room temperature and low temperature, special conductive cables are used to safely connect the power supply system for driving the pump, or the pump is Facilities are required to ensure safety when salvaged outside the tank, but no satisfactory equipment has yet been proposed. In addition, in this type of pump device,
Since the dynamic load of the liquid stored in the tank acts largely in the direction perpendicular to the axis, reliable support and fixation in the direction perpendicular to the axis is also desired, but conventional devices have not had a structure that satisfies this point.

Therefore, as a result of various studies in order to overcome all the problems of the conventional device described above, the inventors of the present invention constructed a motor pump unit and a support tube with approximately the same diameter so that they can be disassembled vertically. It has been found that the above-mentioned problems can be solved at once by connecting the support tube in a liquid-tight and fixed manner and configuring the support tube as a holding device and a discharge fluid path for the motor pump unit.

Therefore, an object of the present invention is to enable factory production with a rigid structure, facilitate assembly and disassembly work, achieve stable pump operation, and improve safety and reliability. The purpose of the present invention is to provide a submerged type pump device with excellent durability.

In order to achieve the above object, in the present invention, a motor pump unit is provided with a suction port at the lower part, and a support pipe having approximately the same diameter as the motor pump unit is connected to the upper end of the motor pump unit. Can be disassembled freely and connected in a liquid-tight and fixed manner,
A feature of the present invention is that the upper end of this support tube is attached to an opening provided at the top of the tank to suspend and hold the motor pump unit within the tank.

In the pump device described above, it is preferable that the motor pump unit is composed of a canned motor pump, and that the pump discharge flow path is formed in a cylindrical shape around the outer periphery of the canned motor section, and the upper end thereof is configured to communicate with the inside of the support tube. be.

Further, the support tube is made of a cylindrical tube body, and a tube for storing a conductive cable is disposed inside. In this case, a connection pipe section that connects to the motor pump unit is connected to the lower end of the support tube in a removable, liquid-tight, and fixed manner, and a conductive cable introduced from the outside and a conductive cable led out from the motor pump unit are connected to the lower end of the support tube in a liquid-tight and fixed manner. It is preferable to provide a compartment for connecting and fixing the conductive cable.

On the other hand, it is preferable that a flange-shaped cover plate is hermetically fixed to the upper end of the support tube, a fluid outlet tube is connected to the cover plate, and a conductive cable storage tube is inserted therethrough.

The canned motor part of the canned motor pump is
A thrust bearing mechanism is provided between the thrust bearing mechanism and the pump chamber, and a part of the pump discharge fluid is introduced from a part of the thrust bearing mechanism into the canned motor section, and is also circulated into the tank from the upper end of the canned motor section. It is preferable if the configuration is configured. In this case, a diff user section is provided in a part of the discharge flow path of the canned motor pump, and an introduction opening for introducing fluid into the canned motor section in a direction perpendicular to the discharge fluid is provided downstream of the diff user section.

In addition, a fluid passage hole communicating with the upper bearing is formed at the upper end of the motor rotor shaft of the canned motor pump, and this passage hole is connected to a communication pipe communicating with the pump discharge passage to supply pump discharge fluid. It is preferable if the configuration is configured.

It is preferable that the conductive cable to be inserted into the conductive cable storage tube be connected and fixed integrally with a plurality of support columns arranged in parallel.

Furthermore, it is preferable that a support device that acts flexibly in the axial direction and rigidly in the direction perpendicular to the axis is fixed to the outer circumference of the motor pump unit, and this support device is fixed to the inner bottom of the tank.

Next, embodiments of a submerged pump device according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a motor pump unit, and 12 indicates a support pipe.The support pipe 12 is configured to have approximately the same diameter as the outer diameter of the motor pump unit 10, and is connected vertically to the motor pump unit 10. do. The upper end of the support tube 12 is fixed to an opening 16 provided at the top of the liquid storage tank 14, and the lower end of the motor pump unit 10 is positioned with a slight distance from the bottom of the tank 14. A support device 18 fixed to the bottom of the tank 14 is disposed around the outer circumference of the motor pump unit 10. The pump device of the present invention basically has the above-mentioned configuration, and the details of each of the above-mentioned components will be explained below.

FIG. 2 shows a sectional view of essential parts of the pump device shown in FIG. 1. The motor pump unit 10 has a canned motor pump structure, and has a pump chamber 2 at the lower end.
An impeller 24 is provided within the pump chamber 20 and equipped with an automatic thrust balance mechanism. A thrust bearing mechanism 26 is provided adjacent to the pump chamber 20, and a canned motor section 28 is provided above the thrust bearing mechanism 26. However, a discharge port 30 is opened at the outer circumference of the pump chamber 20, a pump casing 32 forming the discharge port 30 extends upward, and the thrust bearing mechanism 26 is surrounded and fixed to the inner circumference of the pump casing 32. A cylindrical discharge passage 36 is formed between the discharge passage 34 and the discharge passage 34 . An external motor casing 38 of the canned motor section 28 is connected to a casing 34 surrounding and fixing the thrust bearing mechanism 26.
The pump casing 32 is extended to surround the discharge passage 3 at a slight distance from the discharge passage 3.
Extend 6. The canned motor section 28 includes a motor stator 42 between an outer motor casing 38 and an inner motor casing 40 that are arranged concentrically.
A motor rotor 44 having a sealed structure is disposed within the internal motor casing 40, and one end of the motor rotor shaft 46 of the motor rotor 44 is extended to form an impeller 2 disposed within the pump chamber 20.
This constitutes a common shaft that serves as the support shaft for the four parts. At both ends of the motor rotor 44, the motor rotor shaft 46
is pivotally supported by a lower bearing 48 and an upper bearing 50 to form a lower motor rotor chamber 52 and an upper motor rotor chamber 54 at both ends of the motor rotor 44, respectively. Note that an upper fluid chamber 56 is provided adjacent to the upper motor rotor chamber 54 and surrounding the upper end of the motor rotor shaft 46 .

On the other hand, the thrust bearing mechanism 26 includes a thrust bearing 58 that is pivotally supported on the motor rotor shaft 46, and thrust washers 60 that are in contact with the thrust bearings 58 on the upper and lower surfaces of the thrust bearing 58 are fixedly arranged in a thrust bearing housing 61. . The casing 34 that surrounds and fixes the thrust bearing housing 61 is configured to integrally form the differential user part 62 in a part of the discharge passage 36 formed between the pump casing 38 and a part of the downstream side thereof. An opening 64 is appropriately provided perpendicularly to the discharge passage 36 to introduce a portion of the pump discharge fluid into the thrust bearing housing 61. Therefore, the fluid introduced into the housing 61 lubricates the thrust bearing mechanism 26 and flows into the lower motor rotor chamber 52 while lubricating the lower bearing 48 directly and through the gap provided in the lower bearing 48 as appropriate. do.

In this way, the fluid introduced into the lower motor rotor chamber 52 passes through the gap between the internal motor casing 40 and the motor rotor 44, cools the motor section during this time, flows into the upper motor rotor chamber 54, and then directly and It flows into the upper fluid chamber 56 while lubricating the bearing 50. The fluid introduced into the upper fluid chamber 56 is then transferred to the canned motor section 2.
The liquid is circulated to the outside of the pump casing 32, that is, into the tank 14, through a discharge port 68 formed in the end plate 66 of No.8. In this embodiment, in order to compensate for the lack of lubricating fluid for the upper bearing 50, the motor rotor shaft 46 is provided with a fluid passage hole 70 that communicates the upper bearing 50 with the shaft end. A communication pipe 72 is provided that passes through the upper bearing housing 67, and one end of this communication pipe 72 is connected to the motor rotor shaft 46.
rotatably connected to the fluid passage hole 70,
Further, the other end of the communication pipe 72 is configured to communicate with the pump discharge flow path. With this configuration, part of the pump discharge fluid can be introduced from the upper part of the canned motor section 28 for lubricating the upper bearing 50.

Moreover, the support pipe 12 in the pump device of the present invention
consists of a tube body 74 having an outer diameter that is approximately the same as the outer diameter of the motor pump unit 10, and a connecting tube body 76 having the same diameter is attached to the lower end of this tube body 74 so that it can be disassembled freely by flange connection or the like. Liquid-tight and fixed connection. The lower end of this connecting tube 76 is removably liquid-tightly and fixedly connected to the upper end of the motor pump unit 10, which is closed by the end plate 66 and the upper bearing housing 67, by flange connection or the like. Note that the end plate 66 is appropriately provided with a through hole 78 to allow the discharge passage 36 formed inside the pump casing 32 and the discharge passage 80 formed inside the support tube 12 to communicate with each other. Pipe body 7
A small diameter conductive cable storage tube 82 is fixedly arranged inside the tube body 4 along the inner wall surface of the tube body 74. Also,
A compartment 84 is also provided inside the connecting pipe body 76 in correspondence with the conductive cable storage pipe 82.
4 communicates with the conductive cable storage pipe 82 of the tubular body 74 and communicates with the chamber that houses the motor stator 42 of the canned motor section 28 through the end plate 66, and connects the conductive cable 86 and motor stator 42 introduced from the outside. A conductive cable 88 led out from the compartment 84 is connected to the connecting terminal 9 as appropriate.
Fixed connection via 0. Conductive cable storage pipe 8
A support 92 made of a plurality of wire ropes is inserted into the housing tube 2 in parallel with the conductive cable 86 to be inserted, and the conductive cable 86 and the support 92 are integrally fixed within the storage tube 82.

The support tube 12 configured in this manner has its upper end hermetically fixed with a cover plate 94, a fluid outlet tube 96 is connected to a part of the cover plate 94, and the conductive cable storage tube 82 is made to protrude. and,
Conductive cable storage pipe 82 led out to the outside of the tank
is appropriately connected to the terminal box 98. The lid plate 94 is configured to form a flange portion for the tube body 74, and is detachably suspended and fixed to the opening 16 provided at the top of the tank 14.

Furthermore, the support device 1 in the pump device of the present invention
8 is constructed as shown in FIGS. 1 and 3. That is, in the present invention, one end of a plurality of elongated leaf springs 100 is fixed symmetrically to the outer circumference of the pump casing 32 of the canned motor section 28, and the other end of these elongated leaf springs 100 is attached to the tank 14. A fixing member 102 fixed to the bottom of the
be fixed to each. With this configuration, the support device 18 supports the motor pump unit 10.
Ideal support for the pump device can be achieved by acting softly in the up and down axial directions and stiffly acting in the left and right directions perpendicular to the axis. Note that the configuration of the leaf spring 100 is not limited to fixing a flat plate horizontally as in the illustrated example, but also curve-molding the leaf spring 100 as appropriate to increase flexibility in the axial direction, or The shape and fixing member 10 may be fixed rotatably by hinge connection or the like, or a round bar may be used as a substitute for a leaf spring.
It goes without saying that the fixing means for 2 can be modified in design.

As is clear from the description of the embodiments described above, the pump device of the present invention has many novel configurations not found in conventional devices, and the effects obtained with these new configurations will be explained below.

(1) The motor pump unit and the support tube are connected in a structure of approximately the same diameter and can be disassembled, and the support tube can be suitably used as a discharge path for the pump discharge fluid and a guide tube for the conductive cable. Since it can be assembled outside the tank and then installed inside the tank, installation work inside the tank can be significantly reduced, shortening the construction period and improving the reliability of the pump device.

(2) In addition, the support pipe is provided with a removable connection pipe section at the connection part with the motor pump unit, and the conductive cable introduced from the outside and the conductive cable led out from the motor pump unit are connected here. By providing a connection terminal storage compartment for connection, the connection of the conductive cable becomes easier and the insulation is improved, thereby increasing safety.

(3) Since the conductive cable introduced from the outside is inserted into a special storage tube fixed to the inner peripheral wall of the support tube, insulation protection is complete, and there is no need to use expensive special conductive cables. A conductive cable can be used, and manufacturing costs can be reduced.

(4) The motor pump unit is composed of a canned motor pump, and a thrust bearing mechanism is interposed between the pump chamber and the canned motor section, and a part of the pump discharge fluid is used for lubricating the bearing and from this thrust bearing mechanism. Introduced to cool the motor section, and configured to discharge directly to the outside of the motor pump unit from the upper end of the canned motor section, the overhang of the motor rotor can be shortened to reduce shaft runout and improve the escape of generated gas. Can be done. In this case, by providing a diff user part in a part of the pump discharge port and opening an inlet for lubricating and cooling fluid in the direction perpendicular to the fluid flow on the downstream side of this diff user part, the If a filter or the like is provided at the inlet, a self-cleaning action is always performed and the intrusion of foreign matter can be prevented. Furthermore, by introducing a portion of the pump discharge fluid from the upper end of the motor rotor shaft and replenishing the inner surface of the upper bearing, it is possible to eliminate gas retention that tends to occur in the upper bearing.

(5) Furthermore, since the support device that supports the motor pump unit is configured to act flexibly in the vertical and axial directions, and to act rigidly in the left and right directions perpendicular to the axis, the movement of the liquid stored in the tank is It is possible to avoid applying unreasonable stress to the entire pump device, and it is possible to obtain a submerged type pump device that is strong and has a long life.

(6) Therefore, the pump device of the present invention can be widely applied as a pump device for discharging various liquids not only to marine tanks but also to all types of mobile tanks and fixed tanks.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of a submerged pump device according to the present invention, FIG. 2 is a sectional side view of essential parts of the pump device shown in FIG. 1, and FIG. 3 is a support device shown in FIG. 1. FIG. 3 is a plan view of the attached state. 10... Motor pump unit, 12... Support pipe, 14... Tank, 16... Opening, 18...
Support device, 20...pump chamber, 22...suction port,
24... Impeller, 26... Thrust bearing mechanism,
28...canned motor section, 30...discharge port, 3
2... pump casing, 34... casing,
36...Discharge flow path, 38...External motor casing, 40...Internal motor casing, 42...Motor stator, 44...Motor rotor, 46...
Motor rotor shaft, 48... lower bearing, 50... upper bearing, 52... lower motor rotor chamber, 54...
Upper motor rotor chamber, 56... Upper fluid chamber, 58
...Thrust bearing, 60...Thrust washer,
61... Thrust bearing housing, 62... Differential user part, 64... Opening, 66... End plate, 67... Upper bearing housing, 68...
Discharge port, 70...Fluid hole, 72...Communication pipe, 7
4... Pipe body, 76... Connection pipe body, 78... Through hole,
80...Discharge path, 82...Conductive cable storage pipe,
84...Gaming room, 86...Conductive cable, 88...
Conductive cable, 90... Connection terminal, 92... Support column, 94... Cover plate, 96... Fluid outlet pipe, 98...
...terminal box, 100... leaf spring, 102... fixing member.

Claims (1)

[Scope of Claims] 1. A motor pump unit is provided with a suction port at the lower part, and a support pipe having approximately the same diameter as the motor pump unit is provided at the upper end of the motor pump unit so as to be freely disassembleable and liquid-tight with respect to the motor pump unit.・Fixed connection,
A submerged pump device characterized in that the upper end of the support tube is attached to an opening provided at the top of the tank to suspend and hold the motor pump unit within the tank. 2. The motor pump unit is composed of a canned motor pump, and the pump discharge flow path is formed in a cylindrical shape around the outer periphery of the canned motor part, and the upper end thereof is configured to communicate with the inside of the support tube. Pump device as described in section. 3. The pump device according to claim 1 or 2, wherein the support tube is made of a cylindrical tube body, and a tube for accommodating a conductive cable is disposed inside the support tube. 4 A connection pipe section connecting to the motor pump unit is connected to the lower end of the support pipe in a disassembly, liquid-tight and fixed manner, and a conductive cable introduced from the outside into this connection pipe section and a conductive cable led out from the motor pump unit. The pump device according to any one of claims 1 to 3, further comprising a compartment for connecting and fixing a cable. 5. Claims 1 to 5, wherein a flange-shaped cover plate is hermetically fixed to the upper end of the support tube, a fluid outlet tube is connected to the cover plate, and a conductive cable storage tube is inserted through the cover plate. 4. The pump device according to any one of Item 4. 6 The canned motor part of the canned motor pump is provided with a thrust bearing mechanism between it and the pump chamber,
Claim 2, wherein a part of the pump discharge fluid is introduced from a part of the thrust bearing mechanism and introduced into the canned motor part, and is also circulated into the tank from the upper end of the canned motor part. pump equipment. 7. A diff user section is provided in a part of the discharge flow path of the canned motor pump, and an inlet opening for introducing fluid into the canned motor section in a direction perpendicular to the discharge fluid is provided on the downstream side of the diff user section. 6. Pump device according to item 6. 8. A fluid passage hole communicating with the upper bearing is provided at the upper end of the motor rotor shaft of the canned motor pump, and this passage hole is connected to a communication pipe communicating with the pump discharge passage to supply pump discharge fluid. A pump device according to claim 6 or 7. 9. The conductive cable to be inserted into the conductive cable storage pipe is formed by installing a plurality of pillars in parallel and integrally connecting and fixing them.
Pump device as described in section. 10 Claim No. 1, characterized in that a support device that acts flexibly in the axial direction and rigidly in the direction perpendicular to the axis is fixed to the outer circumference of the motor pump unit, and this support device is fixed to the inner bottom of the tank. 1
The pump device according to any one of Items 1 to 9.