JPH0312240B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric immersion pump device, and more particularly to an electric immersion pump device in which a flow path is formed for supplying and circulating a dielectric liquid to the pump at the bottom of the tube.

[Conventional technology]

Electric immersion pump devices are used, for example, in offshore construction or in cargo tanks of ships, for example for transporting oil or chemical products. These pump devices include a pump body having a pump part with an impeller and a motor chamber housing an electric motor for driving the impeller, a flow path for the liquid conveyed by the pump, and a support at the lower end of the pump body. It consists of a pump body, piping suspended on a support body, and a power supply body that supplies power to an electric motor.

The disadvantage of this type of conventional pump equipment is that the power supply to the motor within the pump body requires stiff and heavy electrical cables that make it difficult to lift the pump body to the level of the support body for inspection and repair. This is done by.

Furthermore, the cables of conventional pumping equipment must be protected by outer tubes, especially when explosive liquids such as crude oil with high vapor pressure are pumped. If the cable is only held by pressure to the cargo discharge pipe in the piping, the cable will undergo significant wear due to chemical deterioration and, if exposed to waves, due to mechanical forces such as waves. .

[Structure of the invention]

The present invention provides a pipe that is suspended from a support cylinder, and has a pump body including an impeller and an electric motor that drives the impeller attached to its lower end, and has a discharge flow path for liquid discharged by the impeller; In an immersion pump device that includes a power supply line that supplies power to an electric motor and a tube that surrounds the power supply line and circulates liquid therein, the power supply line has a tubular shape, and the power supply line is insulated. One of the supply channel and the return channel through which the dielectric liquid flows is formed inside the power supply line, and the other is formed between the outer surface of the power supply line and the inner surface of the tube, and the supply channel and the return channel The present invention is characterized in that the return flow path is communicated with the electric motor through the inside of the electric motor.

The tubing of a submersible pump constructed from tubing sections according to the invention can be easily assembled for use, and the tubing sections can be easily disassembled and reassembled. The effective insulation of the feed line by dielectric liquid, which occurs only when the piping is completed, does not require the interconnection of the insulating medium through the various pipe sections of the piping, and the effect of its insulation is can be obtained throughout. In particular, the pressure inside the pipe when the dielectric liquid circulates is set to be larger than the pressure of the liquid pumped up the discharge flow path, which prevents the liquid from entering the discharge flow path, and prevents the liquid from entering the power supply and The motor can be reliably protected from discharged liquid such as seawater. The use of low voltage power, on the order of 660 volts, has advantages with respect to motor insulation.

The watertight protection tube advantageously forms the central core for the pipe, and the discharge channel is formed between this watertight protection pipe and the outer pipe of the pipe. Further, the power supply line of the present invention has a tubular shape, and forms a supply flow path for the dielectric liquid, and further has a return flow path for the dielectric liquid between the power supply line and the inside of the waterproof protective tube, and is connected to the supply flow path and the return flow path for the dielectric liquid. Since the flow path communicates with the electric motor chamber located at the bottom of the tube,
Heat generated by the rotation of this electric motor can be removed.

The feed line consists of a plurality of tubular feed lines running parallel to each other in a waterproof protective tube or concentric feed lines with solid insulators inserted, the ends of the feed lines being staggered at each end of the tube section. , whereby each feed line can be slidably inserted into a plurality of feed lines at the ends of another tube section staggered in opposite fashion to the feed lines of said tube section.

Further, the present invention provides an immersion type pump device, which is a pipe that has an impeller and an electric motor for driving the impeller, and is suspended from a support together with a pump body at the lower end of the piping, and the piping is arranged so that pumping is carried out by the impeller. We propose a structure consisting of piping with a liquid discharge flow path and a power supply line that supplies power to the electric motor, a waterproof protection tube that houses a dielectric liquid that insulates the power supply line, and a dielectric liquid circulation device.

The conventional power cable for this type of pump device is
There is no equipment to monitor the operation and condition of the pump body at the deck or support level. Since the present invention circulates the dielectric liquid through the pump body, information regarding the condition of the pump body can be determined from the condition of the dielectric liquid returned to the support body level.
The dielectric fluid can thus indicate the operating temperature of the pump body and the presence of leaks in the dielectric fluid circuit.

Circulation of a dielectric liquid into the pump body, in its preferred embodiment, not only allows monitoring of the condition of said pump body, but also preferably by selecting said dielectric liquid to have lubricating properties, thereby providing a lubricating liquid for the bearings in the motor chamber. It is possible to circulate the inside of the motor chamber as follows. Preferably, a cooling device is provided in the circuit through which the dielectric liquid circulated in the motor chamber, for example, on the deck or at the support level, to cool the dielectric liquid, thereby further enhancing the cooling effect. Furthermore, preferably even when the pump is not driven by a motor, circulating the dielectric fluid allows the pump to rotate slowly, ensuring continuous lubrication of the bearings while ensuring that the A gradual movement of liquid occurs, which can reduce the possibility of marine growth in the pump section.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the drawings.

The submersible electric pump device shown in FIGS. 1 to 3 has a substantially vertical pipe 1, which has a support flange 2, which allows the pipe 1 to The ship's air is supported via a cylinder 3 that projects upward from the deck 4 of the offshore structure. The piping 1 is composed of a plurality of pipe pieces 5 that are connected to each other butt against each other, and a pump main body 20 is connected to the lower end thereof. Note that four tube pieces 5 are shown in the drawing. Each tube section 5 has a length that is convenient for handling, so that the pipe 1 can be easily assembled to the required length.

As shown in FIG. 2, each tube section 5 has an outer tube 6 with the necessary compressive strength of the pipe 1. As shown in FIG. This outer pipe 6 forms the outer periphery of a pump main body discharge passage 8 having an annular cross section, and its inner periphery forms a waterproof protection pipe 9.
A plurality of power supply lines 10 extend through the tube 9. Although two feed lines 10 are shown, the number depends on the type of feed. The power supply line 10 has a tubular shape and is made of, for example, a copper tube. The inside thereof is a supply flow path for dielectric liquid (insulating liquid), and the dielectric liquid can be continuously circulated in this flow path, and the return flow path is in the space between the power supply line 10 and the waterproof protection tube 9. It is formed of. The feed lines 10 are separated from each other and from the wall of the waterproof protective tube 9 by spacers 11 made of insulating material. The spacer 11 is perforated so that the dielectric liquid can flow therethrough. The feed lines can be individually insulated with sleeves made of insulating material, but this is not critical due to the insulation provided by the dielectric liquid.

The outer tubes 6 of the tube sections 5 of the pipe 1 are connected to each other by bolts 12 passing through their end flanges 14, with which a suitable sealing device is associated. The lower end of the waterproof protective tube 9 of the upper tube piece 5 is formed as a plug that is detachably inserted into a socket portion formed at the upper end of the waterproof protective tube 9 of the lower tube piece 5. The holed spacer 7 is a waterproof protection tube 9
is held concentrically on the outer tube 6. A double O-ring seal 15 is provided to seal the waterproof protection tube 9 from the discharge flow path 8.

The lower end of each feeder line 10 of the upper tube piece 5 has a plug-shaped termination element 16, which is inserted into a socket-like termination element 19 of each feeder line 10 of the lower tube piece 5. A sliding connection is made within the sleeve 18. This sleeve 18 is sealed with an O-ring to the outer end of the termination member 19, and the sleeve 18 is O-ring sealed to the outer end of the termination member 19,
A number of resilient protruding pads are provided along the sleeve 18 which are O-ring sealed to the outer ends of the sleeve 18 and provide good electrical contact between the members 16 and 19. At the upper end of the upper tube section 5, the waterproof protective tube 9 and the feed line 10 are each provided with a socket portion for detachably connecting with the tube section above it.

At the lower end of the pipe 1, the pump body 20 has an upper chamber accommodating an electric motor consisting of a rotor 21 and a stator 22, and a pump section 24 located below this. At the upper end of the pump body 20,
The waterproof protective tube 9 has an outwardly extending part 25 which forms the outer boundary of the motor compartment in which the power supply line 10 is connected by means of a connecting rod 26 to the coils of the stator 22 . The inside of the feed line 10 communicates with the inside of the motor to carry a dielectric liquid flowing downward, the dielectric liquid being oil, to flush the upper bearing 27 and the lower bearing 28 supporting the rotor of the electric motor. It has lubricating properties. The dielectric fluid is thus circulated through the bearings 27, 28 to provide continuous lubrication. The dielectric liquid is directed radially outward from the lower end inside the motor, and then upwardly into the space between the power supply line 10 and the waterproof protection tube 9 through a flow path provided between the motor and the motor chamber wall. be returned. All bearings requiring continuous lubrication are located in the motor chamber, which is fitted with seals 29.
It is separated from pump section 24 by. The motor shaft 30 extends downwardly through this seal 29 to the pump section 24, and
The liquid surrounding the impellers 31 is discharged from the flow path 8.
Drive to pump through.

As shown in FIG. 1, the outer tube 6 continues above the flange 2 into a curved tube section 36 for communicating the discharge passage 8 with a suitable discharge device, and the waterproof protection tube 9 is connected to the supply For connecting the electric wire 10 to a power source (not shown) and communicating the feeder line 10 and the inside of the waterproof protective tube 9 to the deck where a schematically illustrated installation 37 having a dielectric liquid circuit is mounted. It extends upwardly out of the curved tube section 36 in order to do so.

Circulation of the dielectric liquid takes place by means of a pump 38 of equipment 37 driven by an electric motor 39 and sent to the power supply line 10 through a supply pipe 40 . The return pipe 41 from the waterproof protective tube 9 is firstly connected to a filter 42 in order to remove from the return flow contaminants and particles caused by wear in the pump body.
An indication of the condition of the pump body 20 can be obtained by monitoring particles in the returning dielectric liquid that is removed by the filter 42.

It is clear that continuous circulation of the dielectric liquid during operation removes heat from the electric motor 22. The tubular shape of the feed line 10 provides sufficient cooling of the dielectric liquid circuit. The return pipe 41 leads to a sump 44, where the temperature of the dielectric liquid can be monitored by a thermometer 45, which detects when the set temperature level is reached due to abnormal heat generation in the pump body. , motor 2
It can be connected to a temperature-sensitive circuit breaker to stop the power supply to 2. Normally, even if the immersion pump is unable to transport liquid in the discharge channel, there will be sufficient heat exchange between the waterproof protection tube 9 and its surroundings to remove excess heat from the motor. However, if desired, the return dielectric liquid can be cooled by a cooling device, such as the schematically shown heat exchanger 46. In order to limit the heat transfer from the hot discharge fluid to the dielectric liquid in the discharge channel 8, the waterproof protective tube 9 can be provided with a thermal insulator. On the other hand, where the equipment 37 or the immersion pump body 20 is exposed to low ambient temperatures, a temperature-sensitively controlled electric heater 48 can be provided in the reservoir 44 in order to maintain the dielectric liquid at an optimum temperature. .

If the voltage supplied to the pump body 20 is different from the mains voltage, an oil bath type transformer 49 can be placed in the reservoir 44.

The pump 38 circulates the dielectric liquid at a pressure greater than the discharge pressure produced by an immersion pump, so that the liquid in the discharge channel 8 does not enter the waterproof protective tube 9 or the motor chamber 21. If a leak occurs, it is a leakage of dielectric fluid out of the dielectric fluid circuit. Such losses can be monitored by level sensing device 50 in sump 44.
A level sensitive device can be arranged to indicate the actual loss of dielectric liquid and to cut off the power supply to the immersion pump if the level in the sump 44 falls below a predetermined level.

A vane may be provided at the upper end of the motor shaft 30, and when there is no power supplied to the motor, the flow of dielectric liquid in the motor chamber causes the motor shaft 30 and the impeller 31 to flow through the vane. is rotated slowly. This reduces the possibility of marine growth forming on the impeller during outages when the pumping device is used for pumping seawater.

Instead of providing such a vane on the motor shaft 30, the pump body is provided with a pump unit 32 connected to the upper end of the pump shaft, and this pump unit 3
It is also possible to receive a flow of dielectric liquid from the power supply line 10 via 2 . When the pump motor is in operation, the pump unit circulates the dielectric liquid and the pump 3
8 can be made inoperable or disconnected from the pumping device. If a pump 38 is provided, the pump unit takes the form of a pump/motor which slowly rotates the motor shaft when the motor is stopped as the dielectric fluid flows through the motor.

The removable connection device shown in FIG. 4 is provided at the junction of two pipe sections 5 of the piping in an immersion pump arrangement. The other parts of the immersion pump arrangement correspond to the arrangement of FIG. The waterproof protective tube 9 in the upper tube piece 5 in FIG.
The intermediate feeder line 64 is connected to the inner feeder line 62 and the outer feeder line 66 by an inner sleeve 63 and an outer sleeve 65 made of an insulating material, such as a synthetic resin dielectric material.
electrically isolated from The interior 68 of the inner feed line 62 is used to transport the dielectric liquid downward towards the electric motor within the pump body 20, and the return flow path for this dielectric liquid is between the outermost tubular feed line 66 and the waterproof protection tube 9. It's between.

Lower end portion 69 of waterproof protective tube 9 of upper tube piece 5
is the large diameter end portion 7 of the waterproof protective tube of the lower tube section.
0 with a seal ring 71 interposed between the two. The outer feed line 66 of the upper tube section ends just short of an insulating sleeve 65 between it and the intermediate tubular feed line 64, which itself extends a sufficient distance beyond this insulating sleeve 65. . The insulating sleeve 63 between the intermediate feeder line 64 and the innermost feeder line 62 ends slightly beyond the intermediate feeder line 64, and the innermost feeder line extends a sufficient distance beyond the insulating sleeve 63. .

At the upper end of the lower tube piece, the three concentric tubular feeders 72, 74, 76 and the intervening insulating sleeves 73, 75 have an inverted shape. That is, the outer tubular feed line 76 extends a sufficient distance beyond the insulating sleeve 75 between it and the intermediate feed line 74, with the intermediate feed line 74 terminating just short of this insulating sleeve 75. The diameter of the tubular feeder is determined such that the feeder 66 fits tightly into the feeder 76 with sliding friction, and the other feeders 64, 74 and 62, 72 fit in a similar manner. The protrusion of each insulating sleeve, which surrounds and extends beyond the adjacent feeder line, ensures that effective insulation between the feeder lines at the connection is maintained. The sliding frictional fit between the feed lines of the two tube sections ensures electrical continuity along the pipe without significant increases in electrical resistance at the connection.

The connection device according to the invention of course takes place not only between intermediate tube sections of the pipe 1, but also between such tube sections and the curved tube section 36 and the pump body 20. The lower tube piece shown in FIG. 4 is the upper part of the pump body 20, in which a waterproof protective tube projects outwardly at location 80 to accommodate the electric motor 22. is,
The electrical connection is made via a terminal box 81 which also acts as a spacer between the waterproof protection tube and the power supply line. A connection from intermediate feed line 74 to motor feed cable 82 via terminal box 81 is illustrated. Terminal box 81 is constructed of an insulating material integral with insulating sleeve 75 , and the radially outward extension of feeder line 74 extends through said insulating sleeve 75 , and includes a terminal of cable 82 . 85
The terminal bolt 84 is threaded to receive a terminal bolt 84 extending therethrough.

Since the feed lines 62, 64, 66 are not held rigidly with respect to the waterproof protection tube 9 in the immediate vicinity of the lower end of the tube section, slight deviations in the concentricity of the feed lines and the waterproof protection tube of the lower tube section can be easily absorbed during assembly.

In addition, as shown in Fig. 4, the lower end 6 of the waterproof protection tube
9 is not completely inserted into the waterproof protective tube section 70, and the feed lines 62, 64, 66 are also in a similar relationship with respect to the feed lines 72, 74, 76. Thus, changes in the relative lengths of the various concentric structures of the tube sections due to temperature changes can be accommodated. The central core of the piping, constituted by the waterproof protection tube and the feeder line, can thermally expand and contract independently of the thermal expansion and contraction of the outer tube.

Figure 5 shows the same connections as Figure 4;
Corresponding parts are provided with the same reference numerals as in FIG. 4. In this case the lower tube piece does not contain the motor and the feed line is therefore connected to the hole 88 to allow the return of the dielectric oil.
It is held concentrically with respect to the waterproof protection tube 9 by a spacer 86 having a diameter. In order to enable the feed line of the upper tube piece to be inserted into the feed line of the lower tube piece, the feed line of the upper tube piece has an inwardly facing line as shown at 89. It is tiered.

If pumps and deck equipment are exposed to flame hazards, dielectric fluids with fire-resistant properties are selected.

The invention may in particular be implemented in a different way than the embodiments described above, for example the illustrated shape of the tube section 5 may be substantially modified. The waterproof protection tubes for the discharge tube and the supply line can be arranged parallel to each other in the outer tube, if necessary, or in cooperation with one or several guides.

The waterproof protective tube is partitioned to form a supply channel and a return channel for the dielectric liquid, i.e. an inner tubular feeder line or tubes forming a supply and return channel for the dielectric liquid. Can surround power lines.

〔Effect of the invention〕

As described above, according to the present invention, the power supply line led to the pump has a tubular shape, and either one of the supply flow path and the return flow path through which the dielectric liquid insulating the power supply line flows is connected to the power supply line. Inside, the other is formed between the outer surface of the feed line and the inner surface of the tube, and the supply flow path and the return flow path are communicated through the inside of the electric motor, so that the entire area from the bottom to the top of the tube In addition to ensuring reliable insulation of the power supply line in a compact state, the dielectric liquid circulates through the electric motor to remove heat generated inside the motor, thereby maintaining smooth operation of the electric motor. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an embodiment of an electric immersion pump device according to the present invention, and FIG. 2 is a cross-sectional view of an embodiment of a connection device between pipe sections of piping of the pump device in FIG. 1. , FIG. 3 is a cross-sectional view of the pump body of the pump device in FIG. 1, and FIGS. 4 and 5 are cross-sectional views of different embodiments of the connecting device between the tube sections. 1... Piping, 2... Support flange, 4... Deck, 5...
Pipe piece, 6... Outer pipe (main pipe), 8... Channel for pump conveyed liquid, 9... Waterproof protection tube, 10... Power supply line, 20...
Pump body, 44... dielectric liquid (insulating oil) reservoir,
45...Thermometer, 50...Level meter.

Claims (1)

[Scope of Claims] 1. A supporting cylindrical body having a pump main body 20 including an impeller 31 and electric motors 21 and 22 for driving the impeller attached to its lower end, and provided with a discharge passage 8 for the liquid discharged by the impeller. 3, power supply lines 10:62, 64, 66 for supplying power to the electric motor, and a pipe 9 surrounding the power supply lines and circulating a dielectric liquid therein. In the immersion pump device, the power supply line 10:
Reference numerals 62, 64, and 66 are tubular, and one of the supply channel and return channel through which dielectric liquid insulating the power supply line flows is inside the tubular power supply line, and the other is located on the outside of the power supply line. and an inner surface of the tube, the supply flow path and the return flow path being communicated through the inside of the electric motor. 2. The power supply line according to claim 1, wherein the power supply line has a plurality of tubular power supply lines 10, and the other of the supply flow path and the return flow path is in contact with the pipe 9. pump equipment. 3. The feed line has a plurality of concentric tubular feed lines 62, 64, 66 with hard insulators 63, 65 inserted therebetween, and the other of the supply channel and the return channel borders the tube 9. 2. The pump device according to claim 1, wherein the pump device is in contact with the pump device. 4. The pump device according to any one of claims 1 to 3, wherein the pipe 1 is composed of a plurality of pipe pieces connected to each other so as to be freely separable. 5 The dielectric liquid is a lubricant and is used in the electric motors 21 and 22 to lubricate the bearings of the electric motors.
A pump device according to any one of claims 1 to 4, characterized in that the pump device is guided through a pump. 6. The pump device according to claim 5, further comprising a device for monitoring the state of the dielectric liquid circulated from the electric motor in order to display the operating state and/or characteristics of the electric motor. 7. Claims 6 and 6, characterized in that the dielectric liquid is circulated through a cooling device 46.
The pump device according to any one of paragraphs. 8. Claims 1 to 7, characterized in that the electric motors 21, 22 are drivably connected to impellers and pump units 31, 32 to assist or effect circulation of the dielectric liquid. The pump device according to any one of Item 1. 9. The impeller and the pump units 31, 32 are arranged so that when power supply to the electric motors 21, 22 is stopped, the impeller and the pump units 31, 32 act as a motor that rotates by the circulating flow of the dielectric liquid to rotate the electric motors. Claim No. 8 characterized in that
Pump device as described in section. 10 The piping 1 includes a duct 6, a pipe 9, and a power supply line 10
The duct 6, the tube 9, and the power supply line 10 are made up of a plurality of tube pieces 5 connected at their ends.
Claims 1 to 7 are characterized in that they are arranged at each end of the tube piece so as to be separably connected to a tube piece of the same shape or cooperating therewith. The pump device according to any one of Item 1. 11 The tube piece 5 is connected to the power supply line 10; 62, 64,
11. The pump device according to claim 10, wherein 66 is tubular, and one of the supply flow path and the return flow path runs along the inner surface and the other runs along the outer surface. 12 The other of the supply channel and the return channel is a pipe 9
12. A pumping device as claimed in claim 11, characterized in that it borders on. 13. The pump device according to claim 12, wherein the power supply line includes a plurality of tubular power supply lines 10 extending side by side inside the tube 9. 14 The tubular feeder 10 each has a plug-shaped termination element 16 at one end of the tube section and a socket-shaped termination element 18, 19 at the other end of the tube section, each of which has an adjacent tube section. Claim 1 characterized in that it is adapted to cooperate with a socket-type termination element and a plug-type termination element of a tubular power supply line of
The pump device according to item 3. 15 The feeder line is a plurality of concentric tubular feeder lines 62, 64, 65 with hard dielectrics 63, 65 inserted between them.
and the ends of said feeder lines are staggered at each end of said tube section, so that each feeder line has staggered ends opposite to the initially mentioned staggered tube section. Any one of claims 11 and 12, characterized in that it can be slidably inserted into each of the plurality of feed lines 72, 74, 76 of the cooperating tube section. Pump device described in. 16. Claim 10, characterized in that the tube section 5 is characterized in that the duct 8 for the liquid to be pumped is formed around the feed line between the outer tube 6 and the tube 9. or any one of paragraph 15
Pumping device as described in Section. 17. Pumping device according to claim 16, characterized in that said tube (9) has a cooperating thermal insulator for restricting the flow of heat from the pumped liquid to said dielectric liquid. 18 The tube section 5 provides the necessary structural strength for the outer tube 6 and the feeder line 10; 62,6
A pump according to any one of claims 10 to 17, characterized in that the tube 9 surrounding the outer tube 4, 66 is capable of thermal expansion and contraction almost independently of the outer tube 6. Device.