JP2001207995A - Lubricating oil retainer for sliding surface of seal shaft device in oil chamber of submerged pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricant oil retainer for effectively lubricating and cooling a sliding surface of a shaft seal device and preventing the dissipation of lubricating oil from a central portion to a peripheral wall of an oil chamber in a submerged pump without causing the mixing of air into the lubricating oil. SOLUTION: The double shaft seal device 11 within the oil chamber 3 is surrounded with an annular wall body 10. A flange F2 provided in a tensioned state outside the lower edge of the annular wall body 10 is fixed on a housing 2a on the side of the pump via an annular pressing plate 16. A transverse oil inflow hole 13b is opened for communication between the back of the lower end of a guide vane G within the annular wall body 10 and the oil chamber 3. The upside of the a flange F1 provided in a bent over shape inside the upper edge of the annular wall body 10 is opposed close to the underside of a peripheral wall 1c of an annular groove 1b for fitting an upper maty ring 5a, and an annular groove clearance 13a is formed between the opposed surfaces for the outflow of oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the 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]

2. Description of the Related Art The amount of lubricating oil sealed in an oil chamber in a submersible pump is generally determined by taking into account the heat generated on the sliding surface of the shaft seal device during rotation and the expansion rate due to the heat generated by the motor. An air trap is held in the upper part of the oil chamber at about 80%. By the action of centrifugal force due to the rotation of the shaft sealing device, the lubricating oil is pressed in the direction of the peripheral wall of the oil chamber in a swirling manner, and the air traps are concentrated in the central part, so that the lubricating oil does not attack the essential sliding surface of the shaft sealing device As a result, the lubrication and cooling functions of the sliding surface are impaired.

As shown in FIGS. 7 to 9, the outside of the shaft sealing device 111 is provided with an annular wall 11 as a measure for maintaining the lubrication of the sliding surface of the shaft sealing.
0, a partition plate P for directing the oil flow in the axial direction is interposed on the inner peripheral surface of the annular wall 110, and the lower end of the annular wall 110 is separated from the pump side housing 102a. An oil inlet 113b communicating with the oil chamber 103 is formed all around the lower edge, and the upper edge of the annular wall 110 is fixed to the lower surface of the motor-side housing 101a, and the sliding between the upper mating ring 105a and the seal ring 106a is performed. Moving surface 1
A structure has been proposed in which a plurality of oil outflow holes 113a are provided at key points on the wall surface of the annular wall 110 above 12a.

However, according to the experimental results, in the structure in which the oil inlet 113b communicating with the oil chamber 103 is formed all around the lower edge of the annular wall 110, the centrifugal force due to the rotation of the shaft sealing device 111 causes the oil inlet Since the action occurs near 113b to push out the lubricating oil in the annular wall body 110 to the outside, the action of sucking and pushing up the lubricating oil is significantly inhibited. In addition, the annular wall 110
The lubricating oil scatters directly from the plurality of oil outflow holes 113a drilled in the upper part of the upper surface of the upper part, and eventually the sliding surface 112a between the upper mating ring 105a and the seal ring 106a.
Has a negative effect that the lubricating oil is not immersed in the oil, and the scattered lubricating oil is easily entrained by air from the air trap 115 on the oil surface 114. Further, a difference in the amount of outflow is generated for each outflow hole 113a or even at a portion of the outflow hole 113a, so that air is caught in the annular wall 110 from a portion having a small amount of outflow, and acts in a manner opposite to the operation of the centrifugal force. With the guiding action in the axial direction by the partition plate P, the circulation action of the lubricating oil is hindered by the stirring action in the annular wall 110, and the lubricating oil and air are mixed to generate fine bubbles, The lubricating effect is reduced because the oil / air mixture is present and intervenes in the sliding surface 112a between the upper mating ring 105a and the seal ring 106a, and the lubricating oil flowing between the inside and outside of the annular wall 110 is not smooth. This, coupled with the oil-gas mixture state, makes the sliding surface 11
As a result, the cooling efficiency of 2a is significantly reduced.

Further, the size and number of the oil outflow holes 113a must be adapted to the rotation speed of the pump shaft 104. Increasing or decreasing the size or number is practically impossible.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention 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 the mixing of air into the lubricating oil, and to reduce the rotational speed of the pump shaft. It is an object of the present invention to provide a lubricating oil holding device in which lubricating oil is smoothly circulated irrespective of a change and effective lubrication and cooling of a sliding surface of a shaft sealing device are performed.

[0007]

According to the lubricating oil holding device for the sliding surface of the shaft sealing device in the oil chamber of the submersible pump according to the present invention, the oil chamber interposed between the motor chamber and the pump chamber is recessed in the lower surface of the motor side housing. The upper mating ring of the double-type shaft sealing device is fitted in the ring groove, and the lower mating ring of the double-type shaft sealing device is fitted in the ring groove recessed on the upper surface of the pump side housing. An annular retaining plate for preventing rotation is fixed on the upper surface of the peripheral wall of the annular groove, the outside of the double-type shaft sealing device is surrounded by an annular wall, and the inner peripheral surface of the annular wall is inclined upward in the rotation direction of the pump shaft. A guide vane is fixed so as to form an inclined surface, and a flange protruding outward is attached to the lower edge of the annular wall, and the lower surface of the flange is fixed to the upper surface of the holding plate. To guide vane A horizontal hole for oil inflow that connects the back side of the end to the oil chamber is opened, and the upper edge of the annular wall is made closer to the motor side housing above the sliding surface between the upper mating ring and the seal ring to inward. The upper surface of the flange is formed with an annular groove for oil outflow between the surface facing the lower surface of the peripheral wall of the annular groove for fitting the upper mating ring, and is preferably provided at the upper edge of the annular wall. The gap between the opposed surfaces of the upper surface of the flange and the lower surface of the peripheral wall of the annular groove for fitting the upper mating ring is formed in an annular groove for oil outflow adjusted to be within a range of 0.5 mm to 3 mm, The distance between the inner peripheral surface of the flange attached to the upper edge of the annular wall and the outer peripheral surface of the upper seal ring is 1
It is set in the range of 3 mm to 3 mm.

[0008]

During operation of the pump, lubricating oil in the oil chamber outside the annular wall flows into the annular wall through the lower oil inflow side hole, and lubricates the lower sliding surface and absorbs the heat generated by the guide vanes. Is moved up in the axial direction along the back surface of the flange to lubricate the upper sliding surface and absorb the heat generated from the inner peripheral edge of the flange into the annular groove. It moves into the oil chamber outside the annular wall while forming an oil film inside to prevent air from entering.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.

1 is a motor chamber, 2 is a pump chamber, 3 is an oil chamber interposed between both chambers 1 and 2, 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, 1a is a motor-side housing having an annular groove 1b recessed on the lower surface, 1c is a peripheral wall of the annular groove 1b, 2a is a pump-side housing having an annular groove 2b recessed on the upper surface, and 2c is an annular groove 2
The peripheral wall 5b is loosely engaged with the pump shaft 4 in the oil chamber 3 and the upper mating ring fitted in the annular groove 1b of the motor side housing 1a, and the peripheral wall 5b is loosely engaged with the pump shaft 4 in the oil chamber 3. A lower mating ring 16 fitted into the annular groove 2b of the pump side housing 2a is an annular pressing plate for preventing rotation of the mating ring 5b. The ring 5b is fixed on the upper surface of the circumferential groove peripheral wall 2c while being locked to the cutout portion 18 on the upper surface. 6a is an upper seal ring slidingly contacting the upper mate ring 5a, 6b is a lower mate ring 5b
The lower seal ring 7a is slidably contacted with the lower seal ring 7a. The bellows 7b supports the upper seal ring 6a from the back. The lower ring 7b supports the lower seal ring 6b from the back. An upper retainer 8b for integrally connecting 6a, 7a is fitted to the outer periphery of the lower seal ring 6b and the bellows 7b, and a lower retainer for integrally connecting both 6b, 7b, 9 is a direction opposite to the rotation direction of the pump shaft 4. The upper and lower seal rings 6a,
It is stretched in the direction opposite to 6b via upper and lower retainers 8a and 8b, respectively. Reference numeral 10 denotes an annular wall body 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 upwardly inclined surface in the rotation direction of the pump shaft 4. Guide vanes G are fixed. A flange F2 protruding outward is attached to the lower edge of the annular wall body 10 so that the lower surface of the flange F2 is fixed to the upper surface of the annular holding plate 16, and the lower side of the lower end portion of the guide vane G is moved outward from the position close to the lower side. An oil inflow side hole 13b leading into the oil chamber 3 is opened. In addition, the upper edge of the annular wall body 10 is located above the sliding surface 12a between the upper mating ring 5a and the seal ring 6a, and the air entrapment preventing flange F1 that is protruded inward toward the motor-side housing 1a is provided. In addition, an annular groove 13a for oil outflow is formed between opposing surfaces of the upper surface of the flange F1 and the lower surface of the annular groove peripheral wall 1c, and the interval H1 between the opposing surfaces is in the range of 0.5 mm to 3 mm. , The oil film can be easily formed in the annular groove 13a, and the inner peripheral surface of the flange F1 and the upper seal ring 6
a By setting the distance H2 to the outer peripheral surface within the range of 1 mm to 3 mm, the action of pushing up the lubricating oil by the guide vanes G functions effectively and smoothly guides the lubricating oil to the upper sliding surface 12a. Can be done.

A lubricating oil is sealed in the oil chamber 3,
The filling amount 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 6 a and 6 b also rotates within the annular wall body 10, and the oil outside the annular wall body 10. The lubricating oil in the chamber 3 flows into the inside of the annular wall body 10 from the lower oil inflow side hole 13b to lubricate the lower sliding surface 12b and absorb the sliding heat generated on the sliding surface 12b. It is pushed up along the inclined surface of the guide vane G, moves axially along the back surface of the air entrapment preventing flange F1, lubricates the upper sliding surface 12a, and slides on the sliding surface 12a. The heat is absorbed, the oil flows from the inner peripheral edge of the flange F1 into the annular groove 13a and forms an oil film by surface tension in the annular groove 13a to prevent air from entering. Transferred to However, since the annular groove 13a for oil outflow is formed by the upper surface of the flange F1 and the lower surface of the annular wall 1c facing each other in an annular plane, the formation of an oil film can prevent the entrapment of air. And functions effectively irrespective of the change in the rotation speed of the pump shaft 4.
If the distance is set in the range of 5 mm to 3 mm, the effect can be further enhanced. Further, the distance between the inner peripheral surface of the flange F1 and the outer peripheral surface of the upper seal ring 6a is 1 mm to 3 mm.
By setting the range, oil circulation efficiency by the guide vanes G is enhanced, and lubricating oil is smoothly guided to the upper sliding surface 12a.

[0012]

According to the present invention, it is possible to reliably 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 rotate the pump shaft by the action of forming an oil film in the oil outlet annular groove. The mixing of air into the lubricating oil can be prevented irrespective of the number change, and effective lubrication and cooling of the shaft sealing device can be performed. In addition, the lower edge flange of the annular wall housing the mechanism for performing oil circulation is fixed on the pump side housing via the annular pressing plate, so that assembly is simple and the flatness of the fixing surface is reduced. There is an advantage that it is largely excellent in mechanical stability.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an oil chamber of a submersible pump provided with the device of the present invention.

FIG. 2 is an enlarged view of an upper sliding surface and an annular groove for oil outflow in FIG. 1;

FIG. 3 is an enlarged view of a lower sliding surface and an oil inflow side hole in FIG. 1;

FIG. 4 is a vertical sectional side view of an annular wall in the device of the present invention.

FIG. 5 is a bottom view of the annular wall in the device of the present invention.

FIG. 6 is a vertical sectional side view of an annular holding plate in the apparatus of the present invention.

FIG. 7 is a vertical sectional side view of an oil chamber in a conventional submersible pump.

FIG. 8 is a vertical sectional side view of an annular wall mounted in an oil chamber of a conventional submersible pump.

FIG. 9 is a plan view of an annular wall mounted in an oil chamber of a conventional submersible pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor chamber 1a Motor side housing 1b Ring groove 1c Ring groove peripheral wall 2 Pump chamber 2a Pump side housing 2b Ring groove 2c Ring groove peripheral wall 3 Oil chamber 4 Pump shaft 5a Upper mating ring 5b Lower mating ring 6a Upper seal ring 10 Ring wall DESCRIPTION OF SYMBOLS 11 Double type shaft sealing device 12a Upper sliding surface 13a Oil groove annular groove 13b Oil inflow side hole 16 Annular holding plate F1 Flange protruding inward F2 Flange protruding outward G Guide vane

Claims (3)

[Claims] An upper mating ring of a double-type shaft sealing device is fitted in an annular groove formed in a lower surface of a motor-side housing in an oil chamber interposed between a motor chamber and a pump chamber. The lower mating ring of the double-type shaft sealing device is fitted into the annular groove recessed on the upper surface of the double-type shaft sealing device. Is surrounded by an annular wall, and a guide vane is fixed on the inner peripheral surface of the annular wall so as to form an upwardly inclined surface in the rotation direction of the pump shaft. A flange protruding in the direction is attached, the lower surface of the flange is fixed to the upper surface of the holding plate, and a lateral hole for oil inflow that connects the lower side of the lower end of the guide vane to the oil chamber is formed below the annular wall,
A flange protruding inward is provided by bringing the upper edge of the annular wall closer to the motor side housing above the sliding surface between the upper mate ring and the seal ring, and the upper surface of the flange is attached to the upper mate ring. A lubricating oil holding device for a sliding surface of an oil chamber shaft sealing device in a submersible pump, wherein an annular groove for oil outflow is formed between a surface of the groove and a lower surface of the peripheral wall. 2. A gap between an upper surface of a flange attached to an upper edge portion of an annular wall body and a lower surface of a peripheral wall of an annular groove for fitting an upper mate ring is adjusted within a range of 0.5 mm to 3 mm. The lubricating oil holding device for a sliding surface of an oil chamber shaft sealing device in a submersible pump according to claim 1, wherein the lubricating oil is formed in an annular groove for oil outflow. 3. The distance between an inner peripheral surface of a flange attached to an upper edge portion of an annular wall and an outer peripheral surface of an upper seal ring is 1 mm.
The lubricating oil holding device for a sliding surface of a shaft sealing device in an oil chamber of a submersible pump according to claim 1, wherein the lubricating oil is set within a range of 3 mm to 3 mm.