CN101429942A - Large-scale planet gear submersible electric pump - Google Patents

Abstract

The invention discloses a large-scale planetary gear submersible electric pump, which mainly includes a water pump (1), a motor (2), a planetary gear transmission device (3) and a bearing II (6) and a bearing seat II (5) at the lower part of the motor shaft. , and is coupled with the sun gear of the planetary gear transmission, the planetary gear transmission (3) is arranged in the planetary gearbox (4), and it is characterized in that: the bearing II (6) and the bearing seat at the lower end of the motor shaft II (5) is arranged outside the planetary gearbox (4) casing, and the outside means that the outer wall of the bearing seat is exposed; it has the following advantages: since the bearing II (6) at the lower end of the motor shaft and the bearing seat II (5 ) is installed outside the planetary gearbox (4) box, the outer wall of the bearing housing II (5) is exposed and can be directly contacted with the flowing water in the flow channel for cooling, which plays a good role in protecting the bearing II (6) at the lower end of the motor shaft , thereby prolonging the service life of the bearing.

Description

Large planetary gear submersible pump

Technical field:

The invention relates to a submersible electric pump, in particular to a large-scale submersible electric pump, specifically a large-scale submersible electric pump with a planetary gear reduction device arranged between a motor and a water pump.

Background technique:

In the prior art, large-scale submersible electric pumps can generally be divided into two types, one is a large-scale submersible electric pump in which the water pump and the motor are coaxially arranged, and the other is a planetary gear reduction device installed between the water pump and the motor large submersible pumps.

The latter type of large-scale submersible pump has a motor power of more than 250KW, a flow channel diameter of 1M and above, and a pump speed of below 500r/min. A planetary gear reduction transmission device is introduced between the motor and the water pump. The motor drives the low-speed water pump. The transmission structure relationship of this kind of large submersible electric pump is that the water pump and the motor are respectively provided with independent shafts, and a planetary gear reduction device is connected between the motor shaft and the water pump shaft, and the shaft hole in the planetary gear reduction device is coupled with the water pump shaft. , the sun gear in the planetary gear reduction unit is coupled with the motor shaft. Therefore, this structural configuration has the advantages of greatly reducing the size of the motor, reducing the weight by 40%, increasing the power factor by 17.5%, and increasing the efficiency of the unit by more than 13.5%. However, there are still certain defects in the setting of its internal structure, because of its planetary gear reduction device and its coupling with the sun gear in the device, the bearing and the bearing seat at the lower end of the motor shaft are arranged in the upper depression of the planetary gearbox, and the planetary gear The gearbox is filled with engine oil. During operation, the temperature of the oil in the gearbox is very high. The bearing and bearing seat at the lower end of the motor shaft are in an unfavorable position in the depression on the planetary gearbox, so that the bearing and bearing seat at the lower end of the motor shaft Continuous heat radiation in the planetary gearbox, while the heat resistance of the bearing is low, continuous high heat radiation will inevitably produce and damage the bearing. In actual operation, since submersible electric pumps are mainly used for drainage and drought, their operation is generally continuous for many days or even dozens of days. The temperature of the oil in the tank rises, and the console oil temperature instrument shows that it can reach 120°C or even above 120°C, while the limit temperature that the bearing at the lower end of the motor shaft can withstand is generally 95°C, which causes great damage to the bearing and shortens the The service life of the bearing; at the same time, because the submersible pump is installed and operated vertically, the weight and operating load of the entire motor rotor are carried by the bearing at the lower end of the motor shaft, so the load on the bearing at the lower end of the motor shaft is too large. Damage to the bearing at the lower end of the motor shaft; in addition, the bearing at the upper end of the motor shaft will generate continuous heat during continuous operation for many days or even dozens of days. Poor, long-term heat accumulation will cause damage to the motor shaft bearings, shortening the service life of the bearings. The above reasons have become the Achilles' heel of large planetary gear submersible pumps due to the several reasons that the bearing is in an unfavorable position.

Invention content:

The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a large planetary gear that can avoid the damage of the high-temperature oil in the gearbox to the bearing at the lower end of the motor shaft, thereby prolonging the service life of the bearing. Submersible pump.

The technical solution of the present invention is to provide a large planetary gear submersible electric pump with the following structure.

A large-scale planetary gear submersible electric pump mainly includes a water pump, a motor, and a planetary gear transmission device. The planetary gear transmission device is arranged in a planetary gear box, and is characterized in that it is used in conjunction with the bearing II at the lower end of the motor shaft The bearing seat II is arranged outside the planetary gearbox casing, and the outside means that the outer wall of the bearing seat is exposed.

After adopting the above structure, compared with the prior art, the large planetary gear submersible electric pump of the present invention has the following advantages:

Since the bearing and the bearing seat at the lower end of the motor shaft are arranged outside the planetary gearbox case, the bearing II and the bearing seat II at the lower end of the motor shaft are removed from the upper depression of the gearbox case with high temperature, so that the bearing seat II The outer wall is exposed, and the exposed outer wall of the bearing seat II can directly contact the flowing water in the flow channel, so that the flowing water in the flow channel passes through the cold and heat exchange mode of the bearing seat II, and takes away the heat generated by the continuous high-speed rotating bearing II, avoiding the original bearing The II is located in the inner recess of the gear box, and the damage to the bearing II caused by the continuous high-temperature radiation of the high-temperature oil in the gear box is cooled by the flowing water in the flow channel, which has played a good role in protecting the bearing II at the lower end of the motor shaft. , thereby prolonging the service life of the bearing II at the lower end of the motor shaft. This new method of cooling the lower bearing II of the motor shaft better solves the problem of how to better cool the lower bearing II of the motor shaft in a large planetary gear submersible pump.

As an improvement, the upper end of the bearing block II is in the shape of a large disc, the middle is concave in the shape of a hollow cylinder, and the lower end is in the shape of a large disc and is integrated with the upper half of the gear box. This shape design can make the bearing seat II have a larger contact area with the flowing water in the flow channel, so that its cooling effect is better.

As an improvement, the planetary gearbox case is divided into an upper half and a lower half, the upper half is integrally connected with the bearing seat II, and the lower half is tightly connected with the water pump casing. This structure facilitates the installation or maintenance of the planetary gear assembly.

As an improvement, the number of bearings II at the lower end of the motor shaft is set to two to three. This structure is placed high, which better solves the problem that since the submersible electric pump is installed and operated vertically, the weight and operating load of the entire motor rotor are carried by the bearing II at the lower end of the motor shaft, and the bearing II at the lower end of the motor shaft If the load is too large, the number of bearings II is set to two to three, and the excessive load of the bearing II at the lower end of the motor shaft is dispersed, which is a better protection for the lower end bearing II of the motor shaft and prolongs the service life of the bearing II.

As an improvement, the bearing seat 1 used in conjunction with the upper end bearing 1 of the motor shaft is arranged on the upper part of the motor housing, and the outer wall of the bearing seat 1 is exposed. With this setting, the exposed outer wall of the bearing seat can directly contact the flowing water in the flow channel, so that the flowing water in the flow channel can take away the heat generated by the continuous high-speed rotating bearing through the cold and heat exchange of the bearing seat, avoiding the accumulated heat generated by continuous operation. Damage to bearings.

As an improvement, the bearing seat I at the upper end of the motor shaft is set so that the upper end is in the shape of a large disc, the middle outer wall is concave in a hollow cylindrical shape, the lower end is in the shape of a large disc, and its central axial section is in the shape of a hollow "I". This shape design can make the bearing seat and the flowing water in the flow channel have a larger contact area, so that the cooling effect is better.

As an improvement, the exposed outer wall of the bearing seat II (5) does not mean that it is completely exposed, and the radially inwardly recessed part of the bearing seat II (5) is also provided with a submersible electric pump for placing the pump body immersed in water. The alarm uses a small hollow body for the float. This structural setting can make the large planetary gear submersible pump body flood once, the floating ball will immediately send an alarm signal to the console, making the operation of the entire large planetary gear submersible pump safer.

Description of drawings:

Fig. 1 is a schematic diagram of the overall structure of a large planetary gear submersible pump in the prior art;

Fig. 2 overall structure schematic diagram of large-scale planetary gear submersible electric pump of the present invention;

Fig. 3 is a schematic diagram of the axial section structure of the bearing seat II at the lower end of the motor shaft in the prior art;

Fig. 4 is a schematic diagram of the axial cross-sectional structure of the bearing seat II at the lower end of the motor shaft of the present invention;

Fig. 5 is the schematic diagram of the axial section structure of the bearing seat 1 at the upper end of the motor shaft in the prior art;

Fig. 6 is a schematic diagram of the axial section structure of the bearing seat I at the upper end of the motor shaft according to the present invention.

Shown in the figure: 1. Water pump, 2. Motor, 3. Planetary gear transmission, 4. Gear box, 41. Upper half of the gear box, 42. Upper half of the gear box, 5. Bearing seat II , 6, bearing II, 7, bearing seat I, 8, bearing I.

Detailed ways:

The large planetary gear submersible electric pump of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

FIG. 1 is a schematic diagram of the overall structure of a large planetary gear submersible pump in the prior art, and FIG. 2 is a schematic diagram of the overall structure of a large planetary gear submersible pump according to the present invention. Comparing Fig. 1 with Fig. 2, the large-scale planetary gear submersible electric pump of the present invention mainly includes a water pump 1, a motor 2, and a planetary gear transmission 3. After the lower end of the rotating shaft of the motor 1 passes through the bearing 6 and the bearing seat 5, it is connected The sun gear of the planetary gear transmission 3 described above is a shaft coupling, and the planetary gear transmission 3 is arranged in the planetary gearbox 4. From Fig. 1 and Fig. 2, the large planetary gear submersible electric pump of the present invention is compared with The difference between the large-scale planetary gear submersible electric pump is mainly that the bearing 6 and the bearing seat 5 at the lower end of the motor 2 shaft are arranged outside the planetary gearbox 4, and the outside refers to the bearing seat 5. The outer wall is exposed. The outer wall of the bearing seat 5 is exposed and can directly contact the flowing water in the flow channel, so that the flowing water in the flow channel can take away the heat generated by the continuous high-speed rotating bearing 6 through the cold and heat exchange of the bearing seat, avoiding the original bearing 6 in the gearbox 4 The damage of the high-temperature machine oil inside to the bearing 5 is cooled by the running water in the flow channel, which protects the bearing 6 at the lower end of the motor shaft, thereby prolonging the service life of the bearing 6 at the lower end of the motor shaft.

Fig. 3 is a schematic diagram of an axial section structure of a bearing seat 5 in the prior art, and Fig. 4 is a schematic diagram of an axial section structure of a bearing seat 5 according to the present invention. From the comparison of Fig. 3 and Fig. 4, it can be clearly seen that the shape and structure of the bearing seat 5 in the present invention and the original bearing seat 5 are quite different, and the upper end of the bearing seat 5 in the present invention is a large Disc-shaped, the center is concave and hollow cylindrical, that is, the bearing 6 is installed in the middle of the cylindrical space, and the lower end is a large disc-shaped and connected with the upper half 41 of the gear box 4 casing. This shape design can make the bearing seat 5 have a larger contact area with the flowing water in the flow channel, so that its cooling effect is better.

Simultaneously, it can also be clearly shown from the comparison of Fig. 3 and Fig. 4 that the planetary gearbox 4 casing in the present invention is divided into an upper half 41 and a lower half 42, and the upper half 41 and the bearing housing 5 The connection is integrated, and the flange seal is used between the bearing hole of the bearing seat 5 and the gearbox to prevent the oil in the gearbox 4 from overflowing to the bearing 6 through the middle hole of the bearing seat. Body tight connection. This structure facilitates the installation or maintenance of the planetary gear assembly.

Because the submersible pump is vertically installed and operated, the weight and running load of the entire motor 2 rotor are carried by the bearing 6 at the lower end of the motor shaft. This structural relationship makes the load on the lower end of the motor shaft too large. The excessive load of the bearing 6 at the lower end of the motor shaft is dispersed, and the present invention sets two to three bearings 6 at the lower end of the motor shaft. This embodiment is set to 3. Such arrangement is a kind of better protection to the bearing 6 at the lower end of the rotating shaft of the motor, so that the service life of the bearing 6 is prolonged.

FIG. 5 is a schematic diagram of an axial cross-sectional structure of a bearing seat I at the upper end of a motor shaft in the prior art, and FIG. 6 is a schematic diagram of an axial cross-sectional structure of a bearing housing I at an upper end of a motor shaft in the present invention. It can also be clearly shown from the comparison of Fig. 5 and Fig. 6 that the upper end of the bearing seat I7 at the upper end of the motor shaft in the present invention is in the shape of a large disc, the middle is concave and cylindrical in shape, and the lower end is in the shape of a large disc. The axial section is a hollow "I" shape. The bearing I8 and the bearing seat I7 at the upper end of the motor shaft are arranged on the upper part of the motor housing, and the outer wall of the bearing seat I7 is exposed. With this setting, the exposed outer wall of the bearing seat can directly contact the flowing water in the flow channel, so that the flowing water in the flow channel can take away the heat generated by the continuous high-speed rotating bearing through the cold and heat exchange of the bearing seat, avoiding the accumulated heat generated by continuous operation. Damage to bearings.

The exposed outer wall of the bearing seat II5 does not mean that it is completely exposed. A small floating ball is also provided on the radially inner concave part of the bearing seat II5 for placing a water-immersed alarm in the pump body of the submersible electric pump. cavity body. When a small hollow cavity for placing the submersible electric pump body flooded alarm float is arranged in other parts (such as in the gear box), then the outer wall of the bearing seat II5 can be exposed. All naked.

Claims (7)

1, a kind of large-scale planet gear submersible electric pump, include water pump (1), motor (2), planetary type gear transmission unit (3), described planetary type gear transmission unit (3) is arranged in the epicyclic gearbox (4), it is characterized in that: be arranged on the outside of described epicyclic gearbox (4) casing with the matching used bearing support II of rotating shaft bottom end bearing II (6) (5) of described motor, described outside is meant that the outer wall of described bearing support II (5) is exposed.

2, large-scale planet gear submersible electric pump as claimed in claim 1, it is characterized in that: the upper end of described bearing support II (5) is the great circle dish type, middle be hollow cylindrical for the footpath concaves, the lower end is the great circle dish type and links into an integrated entity with the first half (41) of gear-box (4) body.

3, large-scale planet gear submersible electric pump as claimed in claim 1, it is characterized in that: described epicyclic gearbox (4) casing is divided into the first half (41) and Lower Half (42), the described first half (41) connects as one with bearing support II (5), described Lower Half (42) is fastenedly connected with water pump (1) housing, and the described first half is detachable the connection with Lower Half.

4, large-scale planet gear submersible electric pump as claimed in claim 1 or 2 is characterized in that: the bearing I I (6) of described motor (2) rotating shaft lower end is set to two or three.

5, large-scale planet gear submersible electric pump as claimed in claim 4 is characterized in that: the bearing I I (6) of described motor (2) rotating shaft lower end is set to three.

6, large-scale planet gear submersible electric pump as claimed in claim 1, it is characterized in that: be arranged on described motor (2) housing top with described motor (2) rotating shaft upper end bearing I (8) matching used bearing support I (7), the outer wall of described bearing support I (7) is exposed.

7, large-scale planet gear submersible electric pump as claimed in claim 6, it is characterized in that: the bearing support I (7) of described motor (2) rotating shaft upper end is arranged to the upper end and is the great circle dish type, middle is directly to concave to be hollow cylindrical, and the lower end is the great circle dish type, and its axial section is hollow " worker " font.

Images