JP3045316U - Lubricating oil holding device for sliding surface of shaft seal device in oil chamber in submersible pump - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the lubricating oil from escaping from the center of the oil chamber in the submersible pump in the direction of the peripheral wall and to prevent air from being mixed into the lubricating oil. Provided is a lubricating oil holding device that performs effective lubrication and cooling. The outside of a double-type shaft sealing device in an oil chamber is surrounded by an annular wall, and an inclined surface is formed on the inner peripheral surface of the annular wall toward the rotation direction of the pump shaft. The guide vane G is fixed so that the gap between the upper end of the annular wall 10 and the motor-side housing 1h is formed in the oil outflow groove 13a, and the lower end of the annular wall 10 and the pump-side housing 2h are fixed to each other. The oil inflow groove 13b is provided along the contact surface of the oil.

Description

[Detailed description of the invention]

[0001]

[Technical field of invention]

 The present invention relates to a lubricating oil holding device for a sliding surface of a shaft sealing device in an oil chamber of a submersible pump.

[0002]

[Prior art and its problems]

 The amount of lubricating oil filled in the oil chamber of the submersible pump is generally set at about 80% of the total volume of the oil chamber, taking into account the heat generated on the sliding surface of the shaft sealing device and the heat generated by the motor during rotation. The department has an air trap.

However, due to the centrifugal force caused by the rotation of the shaft sealing device, the lubricating oil is vortexly pressed toward the peripheral wall of the oil chamber to generate air trapping at the center, and the sliding surface of the shaft sealing device at the center is lubricating oil. Will not be immersed, and the lubrication and cooling functions of the sliding surface will be impaired.

In order to prevent the lubricating oil from being swirled by centrifugal force, as shown in FIGS. 3 and 4, the outside of a shaft sealing device 11 ′ is surrounded by an annular wall 10 ′ and its inner peripheral surface A baffle plate 10'p is vertically provided vertically along the direction, and a round hole 13 'for oil distribution is formed at a key point on a wall surface. However, due to the rotation of the seal ring pressing coil spring 9 ', the lubricating oil and the air in the air trap 15' collide with the vertical baffle plate 10'p and are forcibly mixed in the annular wall 10 'so as to be fine. Bubbles are generated and an oil-air mixture state is formed, and the oil is interposed on the sliding surface 12 'between the floating sheet 5' and the seal ring 6 ', so that the lubrication effect is reduced. In addition, since a circular hole 13 ′ for oil circulation is formed in a key portion of the wall surface of the annular wall 10 ′, lubrication between the inside and the outside of the annular wall 10 ′ in the oil chamber 3 ′. The oil circulation operation is not smooth, which, combined with the oil-gas mixture state, results in a significant decrease in the cooling efficiency of the sliding surface 12 '.

[0005]

[Purpose of the invention] The purpose of the invention is to prevent the lubricating oil from escaping from the center of the oil chamber of the submersible pump in the direction of the peripheral wall and to prevent the air from being mixed into the lubricating oil without causing the sliding of the shaft sealing device. It is an object of the present invention to provide a lubricating oil holding device capable of performing effective lubrication and cooling of a surface.

[0006]

[Structure of device]

 In the lubricating oil holding device for the sliding surface of the oil chamber shaft seal device in the submersible pump according to the present invention, the outside of the double type shaft seal device in the oil chamber interposed between the motor chamber and the pump chamber is surrounded by an annular wall. The guide vanes are fixed to the inner peripheral surface of the annular wall so as to form an upward slope toward the rotation direction of the pump shaft, and the upper edge of the annular wall slides between the upper floating seat and the seal ring. The annular gap is formed in the oil outflow groove near the motor side housing above the surface, and the lower edge of the annular wall is brought into contact with the pump side housing along the contact surface. A notch is provided at the lower edge so as to form an oil inflow groove, and the inflow groove formed by the notch is formed at a position close to the back side of the lower end of the guide vane.

[0007]

[Action]

 During the operation of the pump, the axial flow impeller on the outer periphery of the lower retainer rotates together with the pump shaft, and the lubricating oil in the oil chamber outside the annular wall flows into the inside of the annular wall from the lower oil flow groove, and the annular wall extends. The lubricating oil inside the body is pushed up to lubricate the lower sliding surface and the upper sliding surface, and absorbs heat from both sliding surfaces while passing through the upper oil flow groove to the oil chamber outside the annular wall. Move to.

[0008]

【Example】

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

1 is a motor chamber, 2 is a pump chamber, 3 is an oil chamber interposed between the two chambers 2 and 3, and 4 is drawn out of the motor chamber 1 and penetrates through the oil chamber 3 and is introduced into the pump chamber 2. The pump shaft 5a is engaged with the pump shaft 4 in the oil chamber 3 and the upper floating seat fixed to the motor chamber side housing 1h. The pump shaft 5b is engaged with the pump shaft 4 in the oil chamber 3 and the pump side. The lower floating sheet fixed to the housing 2h, 6a is an upper seal ring that slides on the upper floating sheet 5a, 6b is a lower seal ring that slides on the lower floating sheet 5b, 7a is a bellows that supports the upper seal ring 6a from the back, 7b Is a bellows that supports the lower seal ring 6b from the back, and 8a is fitted around the outer periphery of the upper seal ring 6a and the bellows 7a. The lower retainer 8b is fitted around the lower seal ring 6b and the bellows 7b to integrally connect the two 6b, 7b, and the lower retainer 9 is used to press the seal ring. It is a coil spring and is stretched between back-facing surfaces of the upper and lower seal rings 6a and 6b via retainers 8a and 8b, respectively. Reference numeral 10 denotes an annular wall that surrounds the outside of the double-type shaft sealing device 11 having the above-described configuration in the oil chamber 3, and has an inner peripheral surface having an upward slope toward the rotation direction of the pump shaft 4. A guide vane G is fixed so as to form an inclined surface. The upper edge of the annular wall 10 is closer to the motor side housing 1h above the sliding surface 12a between the upper floating sheet 5a and the seal ring 6a to form an annular gap in the oil outflow groove 13a. The lower edge of the annular wall 10 is brought into contact with the pump-side housing 2h, and a cutout is formed in the lower edge so that an oil inflow groove 13b is formed along the contact surface. .

The oil chamber 3 is filled with lubricating oil. The amount of the lubricating oil is about 80% of the total volume of the oil chamber 3, and an air trap 15 is formed on the oil surface 14. During operation of the pump, with the rotation of the pump shaft 4, the coil spring 9 stretched between the back-facing surfaces of the upper and lower seal rings 6a and 6b also rotates within the annular wall body 10, and the lubricating oil in the annular wall body 10 Is pushed up along the inclined surface of the guide vane G, and the lubricating oil in the oil chamber 3 outside the annular wall body 10 flows into the inside of the annular wall body 10 from the lower oil flow groove 13b, and The lubricating oil lubricates the lower sliding surface 12b and the upper sliding surface 12a and absorbs the sliding heat generated on the two sliding surfaces 12a, 12b, while passing from the upper oil flow groove 13a to the outside of the annular wall body 10. The lower oil flow groove 13b is formed at the lowermost end of the annular wall body 10 and the upper oil flow groove 13a is formed at the uppermost end of the annular wall body 10. Engraved in the department Therefore, the circulation operation of the lubricating oil is performed extremely smoothly. Further, since there is no vertical baffle plate on the inner side surface of the annular wall body 10 as in the prior art, there is no occurrence of oil-gas mixture. Furthermore, since the upper flow groove 13a is located above the upper sliding surface 12a, the lubricating oil inside the annular wall body 10 ensures the lubrication and heat absorption of the sliding surface 12a. And then moves into the oil chamber 3 outside the annular wall 10.

[0011]

[Effect of the invention]

 According to the present invention, unlike the conventional lubricating oil in which the lubricating oil and the air collide with and mix with the vertical baffle plate, lubricating oil containing no air bubbles is retained on the sliding surface of the shaft sealing device, so that lubrication is improved. In addition to the smooth circulation of the lubricating oil inside and outside the annular wall, there is an advantage that the heat absorption and cooling effect is large.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an oil chamber of a submersible pump to which the present invention is applied.

FIG. 2 is a perspective view of an annular wall in the device of the present invention.

FIG. 3 is a vertical sectional side view of an oil chamber in a conventional submersible pump.

FIG. 4 is a perspective view of an annular wall mounted in an oil chamber of a conventional submersible pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor room 1h Motor side housing 2 Pump room 2h Pump side housing 3 Oil chamber 4 Pump shaft 5a Upper floating seat 6a Upper seal ring 6b Lower seal ring 10 Annular wall body 11 Double type shaft seal device 12a Upper slide Surface 13a Upper oil flow groove 13b Lower oil flow groove G Guide vane

Claims (1)

[Utility model registration claims] An outside of a double-type shaft sealing device in an oil chamber interposed between a motor chamber and a pump chamber is surrounded by an annular wall, and an inner peripheral surface of the annular wall is directed toward a rotation direction of the pump shaft. The guide vane is fixed so as to form an upwardly inclined surface, and the upper end edge of the annular wall is brought closer to the motor-side housing above the sliding surface between the upper floating sheet and the seal ring to form an annular gap. Is formed in the oil outflow groove, the lower edge of the annular wall is brought into contact with the pump side housing, and a cutout is provided in the lower edge so that the oil inflow groove is formed along the abutting surface, The inflow groove formed by the notch is formed at a position near the back side of the lower end of the guide vane. The lubricating oil holding device for the sliding surface of the oil chamber shaft sealing device in the submersible pump.