JP3145819U - Drive shaft water seal device for submersible motor pump - Google Patents

Abstract

To provide a submersible motor pump that limits the intrusion of earth and sand contained in groundwater, particularly silt as much as possible, and extends the motor life.
SOLUTION: A plurality of impellers 40 that are fixedly attached to a drive shaft 5 connected to a motor 2 are respectively housed in an intermediate case 45 having a water conduit 46 on an inner wall surface, and the intermediate case is In the submersible motor pump 1, which is connected in multiple stages as many as the number of impellers, an upper case containing a check valve is attached at the uppermost stage, and a suction case 10 is attached between the intermediate case 45 and the motor 2 at the lowermost stage. A first seal portion 15 is formed by axially attaching an umbrella sleeve 16 that contacts the upper end portion 12 of the inner cylinder 11 to the drive shaft 5 that passes through the center of the inner cylinder 11 provided in the center of the suction case 10. A water seal case 20 that seals the drive shaft 5 between the motor 2 and the suction case 10 has a second seal portion 25 made of a labyrinth seal in the bearing portion 22 of the water seal case 20 and water in the storage chamber 21 of the water seal case 20. Large specific gravity It is provided with a third seal portion 35 enclosing the body.
[Selection] Figure 1

Description

  The present invention relates to an improvement of a so-called deep well submersible motor pump used for pumping ground water or hot spring water.

Conventionally, a deep well submersible motor pump used for pumping up groundwater or hot spring water has a vertical axis as a whole, a motor at the lower end, a strainer for sucking groundwater into the upper portion of the motor, and an upper end of the strainer. A plurality of impellers for pumping water are attached to a drive shaft connected to the motor at regular intervals, and an intermediate case having a plurality of water conduits on the inner peripheral surface outside the impeller is covered with the intermediate case. Are connected to each other in multiple stages, and an upper case having a check valve and a pumping pipe attached to the uppermost stage is known (Patent Document 1).
Japanese Utility Model Publication No. 60-28294.

  The submersible motor pump has a structure in which the motor is positioned at the lowest stage, the motor is always submerged in water, and the rotational force is transmitted to the drive shaft via the motor shaft. It is inevitable that the earth and sand contained in the water will settle and accumulate near the motor, and that groundwater and earth and sand will enter the motor.

  On the other hand, groundwater (including hot spring water) contains not only water but also a lot of earth and sand such as sand and silt. Among these earth and sand, sand particles have an average size of 0.625 to 2 mm. The silt particles close to the soil are very fine, 0.004 to 0.625 mm. Since these earth and sand have heavier specific gravity than water, when they are sucked together with groundwater by a submersible motor pump, they naturally settle and accumulate below, regardless of whether the motor is driven or stopped.

  When sediment accumulates below the submersible motor pump, as described above, the soil enters the motor located at the lowermost end from the gap of the motor shaft together with water, causing failure due to rotation failure and significantly reducing the life of the motor. Is.

  Therefore, since the motor can infiltrate impurities such as earth and sand contained in groundwater and groundwater regardless of how the motor shaft and drive shaft are sealed, how long the infiltration of earth and sand contained in these groundwater is delayed to extend the life of the motor. The big problem is whether it can be done.

  Therefore, as shown in FIG. 4, the strainer 65 of the conventional submersible motor pump 60 is provided with a sand reservoir 68 formed of a concave groove on the lower center surface of the shaft hole 67 through which the drive shaft 63 passes, and collects sedimented sediment. Intrusion into the motor due to scattering of earth and sand is prevented.

  However, since the sand reservoir 68 is provided adjacent to the shaft hole 67 of the motor shaft 62 below the strainer 65 in terms of design, sand having relatively large particles is accommodated in the sand reservoir 68 and is supplied to the motor 61. Although it is possible to prevent intrusion into the interior, the conventional sealing means attached to the drive shaft 63 transmits fine particles contained in the groundwater that enters the motor 61 through the motor shaft 62 from the drive shaft. It is difficult to prevent intrusion of silt or the like, and therefore it is difficult to extend the life of the motor 61.

  On the other hand, the submersible motor pump 60 overhauls the submersible motor pump by pulling out the submersible motor pump about once every two years because the stones of impurities dissolved in the groundwater adhere to the impeller 75 and reduce the pumping power. As described above, the motor is always submerged in the water, and since the silt contained in the groundwater enters and easily breaks down, the motor has a life of about one year and must be replaced. Don't be. For this reason, submersible motor pumps perform some inspection and replacement work every year, such as replacing motors due to motor failures in addition to overhauls, so work efficiency is poor, and motor costs and inspection work costs are very uneconomical. It has a big problem.

  Therefore, the present invention limits the intrusion of earth and sand contained in groundwater, particularly silt, into the motor 61 of the submersible motor pump 60 as much as possible to extend the life of the motor 61 and at least overhaul the submersible motor pump 60 for about two years. The purpose is to prolong life.

  In order to achieve the above object, the present invention provides an intermediate case having a plurality of impellers 40 rotatably attached to a drive shaft 5 that rotates in conjunction with the motor 2 at fixed intervals, and a water conduit 46 on an inner wall surface. 45, each intermediate case is connected in multiple stages by the number of the impellers, an upper case containing a check valve is attached to the uppermost stage, and the intermediate case 45 and the motor 2 at the lowermost stage are attached. In the submersible motor pump 1 in which the suction case 10 is attached between, the upper end portion 12 of the inner cylinder 11 is rotatable with the drive shaft 5 passing through the center of the inner cylinder 11 provided in the center of the suction case 10. A water seal case 20 for sealing the drive shaft 5 is interposed between the motor 2 and the suction case 10, and a water seal case 20 is provided between the motor 2 and the suction case 10. Bearing provided on top of A second seal portion 25 formed of a labyrinth seal formed on the inner wall 22 and a third seal portion 35 formed by sealing the liquid 36 in the storage chamber 21 provided in the water seal case 20. Features. In addition, the umbrella sleeve 16 constituting the first seal portion 15 of the suction case 10 is provided with a tapered chamfered portion 17 on the outer side of the upper surface, and the inner cylinder 11 has a sleeve portion 13 which is formed in a mountain-shaped hem. Is formed integrally with the lower surfaces of a plurality of suction ports 14 provided on the peripheral surface of the suction case 10. Further, the second seal portion 25 of the water-sealed case 20 includes a pair of male and female inner and outer rings 26, 28. One inner ring 26 is fixed to the drive shaft 5, and the other outer ring 28 is attached to the bearing portion 22. It is characterized in that the adjacent surfaces 27 and 29 facing each other are attached in a concavo-convex shape in a non-contact state. Further, the second seal portion 25 is characterized in that a gap between the non-contact proximity surfaces 27 and 29 where the inner ring 26 and the outer ring 28 face each other is formed to be 0.03 to 0.07 mm. Further, the third seal portion 35 is characterized in that an enclosing liquid 36 having a specific gravity greater than that of water is enclosed in a storage chamber 21 provided in the center of the water seal case 20. Further, the sealing liquid 36 is characterized by being silicon oil or propylene glycol in accordance with the use conditions of the motor and the type of the motor.

  Accordingly, the suction case 10 of the submersible motor pump 1 is provided with a first seal portion 15 that mainly removes sand, and the water seal case 20 is provided with a second seal portion 25 that is mainly composed of a labyrinth seal that removes silt, and a reservoir. The chambers 21 are respectively provided with third seal portions 35 filled with a liquid having a specific gravity higher than that of water, and by restricting the ingress of groundwater and earth and sand into the drive shaft 5 as much as possible, the motor 2 is greatly delayed in failure due to rotation failure. Can extend the lifespan.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a main part of a submersible motor pump according to the present invention, FIG. It is a principal part expanded sectional view of a 2nd seal part. The submersible motor pump 1 has a vertical axis as a whole, a motor 2 positioned at the lower end, a water seal case 20 attached to the upper part of the motor, a suction case 10 for sucking groundwater above the water seal case, A plurality of impellers 40 are axially attached to the drive shaft 5 having one end connected to the motor 2 above the suction case, and a plurality of water conduits 36 are provided on the inner peripheral surface outside the impellers. Cover each intermediate case 45, connect the intermediate cases in multiple stages upward, and connect the upper case (not shown) with a check valve (not shown) and a pumping pipe (not shown) on the top. Is formed.

  As shown in FIGS. 1 and 2, the suction case 10 is provided with an inner cylinder 11 formed in a mountain shape that spreads in the axial direction at the center of the interior, and the lower portion of the hem 13 of the inner cylinder is arranged around the suction case 10. It forms in the same surface as the lower surface of the some inlet 14 provided in the surface. By inclining the inner cylinder 11 so as to spread out at the bottom and forming the lower end on the same surface as the lower surface of the suction port 14, the settled earth and sand can be discharged from the suction port 14 to the outside. Sediment can be prevented from accumulating.

  The first seal portion 15 provided in the suction case 10 includes an umbrella sleeve 16 pivotally attached to the drive shaft 5 passing through the center of the inner cylinder 11 via a first sleeve 18 and a second sleeve 50, and the inner cylinder. 11 is formed in contact with the upper end portion 12. The umbrella sleeve 16 is provided with a chamfered portion 17 whose upper surface is tapered to prevent sedimentation sediment from accumulating on the upper surface of the chamfered portion 17.

  By making the gap between the upper end portion 12 of the inner cylinder 11 constituting the first seal portion 15 and the lower surface of the umbrella sleeve 16 a width of 0.6 to 2 mm, at least of the earth and sand contained in groundwater, Sand with relatively large particles can be eliminated.

  As shown in FIGS. 1 and 3, the water seal case 20 is attached between the motor 2 and the suction case 10, forms a storage chamber 21 at the center of the interior, and has a bearing portion 22 at the upper end of the storage chamber. In the storage chamber 21, the tip of the motor shaft 3 of the motor 2 and the lower end of the drive shaft 5 positioned in a vertical phrase are connected via a shaft joint 6, and the storage chamber 21 is connected to the lower end opening 23. A water seal plate 24 for water sealing is attached, a second seal part 25 made of a labyrinth seal is attached to the bearing part 22, and a third seal part 35 made of a liquid having a specific gravity higher than water is provided in the storage chamber 21.

  As shown in FIGS. 1 and 3, the second seal portion 25 attached to the water seal case 20 is a so-called labyrinth seal, and includes an inner ring 26 and an outer ring 28 that are formed in a ring shape. The outer ring 28 is fixed to the bearing portion 22 of the water seal case 20 via the seal ring 31 so as to be rotatably mounted between the upper end of the shaft coupling 6 of the drive shaft 5 and the lower end of the first sleeve 18. It is.

  The opposing contact surfaces 27 and 29 of the inner ring 26 and the outer ring 28 of the second seal portion 25 are bent in a concavo-convex shape in a non-contact state and are substantially meshed to form a fluid flow path in a complicated maze shape. To seal. The clearance between the contact surfaces 27 and 29 where the inner ring 26 and the outer ring 28 are approximately meshed in a substantially concave-convex shape is 0.03 to 0.07 mm, preferably a clearance that can prevent the intrusion of silt. It is formed to 05 mm.

  By narrowing and bending the gap between the inner and outer rings 26 and 28, the pressure loss generated in the gap and the centrifugal force due to the rotation of the inner ring 26 suppress the infiltration of silt contained in the groundwater from above, From the bottom, it is possible to suppress the outflow of the sealed liquid sealed in the storage chamber.

  In the second seal portion 25, since the inner and outer rings 26 and 28 are not in contact with each other, there is no fear that the seal portion will generate heat, and the precipitates dissolved in the groundwater will change heat and become solidified and adhere. Therefore, the bearing portion can be prevented from being clogged.

  In addition, since the known labyrinth seal is used in the atmosphere, the non-contact surfaces of the inner and outer rings facing each other are chevron-shaped and are formed to be jagged like a saw blade. However, since the submersible motor pump 1 is always immersed in water, it is difficult to perform a sufficient seal with the conventional labyrinth seal. For this reason, intrusion of groundwater is sealed by forming the proximity surfaces (non-contact areas) 27 and 29 of the inner and outer rings 26 and 28 of the second seal portion 25 in a concavo-convex shape so as to substantially increase the contact area.

  The third seal portion 35 is composed of a sealed liquid 36 sealed in the storage chamber 21 of the water-sealed case 20, and the sealed liquid is sealed in the entire storage chamber 21 with a liquid having a specific gravity greater than that of water. By enclosing a liquid having a specific gravity greater than that of water, when groundwater that has passed through the drive shaft 5 and passed through the first and second seal portions 15 and 25 enters the third seal portion 35, the groundwater has a specific gravity greater than that of the encapsulated liquid 36. Since it is small, the penetration into the motor direction can be limited. Therefore, it is possible to significantly delay the time until the groundwater containing silt enters the motor 2 from the motor shaft 3 and causes the rotation failure of the motor 2, and as a result, the life of the motor 2 can be extended. The sealed liquid 36 sealed in the storage chamber 21 is a liquid having a specific gravity greater than that of water, and a liquid such as silicon oil or propylene glycol is used according to the use conditions and the type of motor.

  The intermediate case 45 individually covers a plurality of impellers 40 that are axially attached to the drive shaft 5 penetrating through the center via a sleeve 50 at regular intervals. 45, and the intermediate case is formed in a multistage connection in the vertical direction.

  A plurality of water conduits 46 are provided on the inner wall of each intermediate case 45 so as to be curved in the vertical direction, and groundwater is blown by centrifugal force due to the rotation of a plurality of blade pieces 41 provided on the lower surface of the impeller 40. Is pumped from the lower end inlet 47 of the water conduit 46 to the upper end outlet 48, and further pumped up to an intermediate case one stage higher.

  Hereinafter, the operation of the embodiment of the present invention will be described. When groundwater is pumped using the submersible motor pump 1, when the drive shaft 5 is rotated by the motor 2, each impeller 40 rotates and is negatively charged in the pump. Pressure is generated and groundwater is sucked from the suction port 14 of the suction case 10, and groundwater is ejected in the centrifugal direction by the centrifugal force generated by the rotation of the impeller 40.

  The groundwater blown in the centrifugal direction by the impeller 40 is sucked in from the lower end inlet 47 of each water conduit 46 of the intermediate case 45, ejected from the upper outlet 48 and pumped into the intermediate case on the upper stage, and the intermediate case It is ejected again in the centrifugal direction by the inner impeller, sucked in from the lower end suction port of each water conduit of the intermediate case, and further pumped into the intermediate case one level above. By repeating the above steps, the groundwater pumped upward is pumped to the ground from a pumping pipe (not shown) connected to an upper case (not shown).

  Groundwater that enters through the drive shaft 5 of the submersible motor pump 1 is sealed by the first seal portion 15 provided in the suction case 10 and the second and third seal portions 25 and 35 provided in the water seal case 20. Thus, it is possible to extend the life of the motor by limiting the intrusion of impurities such as earth and sand contained in the groundwater and the groundwater to a minimum.

  The first seal portion 15 provided in the suction case 10 has a gap formed by rubbing the umbrella sleeve 16 attached to the drive shaft 5 penetrating the center of the inner cylinder 11 and the upper end portion 12 of the inner cylinder 11. By setting the width to 0.6 to 2 mm, it is possible to exclude sand having relatively large particles among at least earth and sand contained in groundwater.

  Furthermore, the inner cylinder 11 of the suction case 10 is formed in a mountain shape with a hem spread, and the skirt 13 is formed on the same surface as the lower surfaces of the plurality of suction ports 14 provided on the peripheral surface of the suction case. By providing the chamfered portion 17 on the upper surface, the sedimented sediment is prevented from accumulating on the top surface of the umbrella sleeve 16, and the sedimented sediment is transferred from the bottom portion 13 of the inner cylinder 11 to the bottom surface of the suction port 14. Since it is discharged, it is possible to prevent sediment from accumulating in the suction case 10.

  Groundwater that has passed through the first seal portion 15 of the suction case 10 is suppressed by the second and third seal portions 25 and 35 provided in the water seal case 20. The second seal portion 25 faces the adjacent surfaces 27 and 29 of the inner ring 26 that rotates integrally with the drive shaft 5 and the outer ring 28 fixed to the bearing portion 22 in a non-contact state by bending in a concavo-convex shape. The pressure loss caused by the gap and the centrifugal force that rotates the inner ring 26 prevent intrusion of groundwater, and the gap between the second seal portion 25 where the inner ring 26 and the outer ring 28 are substantially meshed in an uneven shape. Is 0.03 to 0.07 mm, preferably 0.05 mm. By setting this gap to 0.05 mm, silt contained in the groundwater that has passed through the first seal portion 15 passes through the second seal portion 25 to suppress intrusion into the lower water seal case 20. Can do.

  Since the inner and outer rings 26 and 28 are not in contact with each other, the second seal portion 25 does not generate frictional heat between the inner ring 26 and the outer ring 28 that rotate with the drive shaft 5, so that it dissolves in the ground water. Since the deposited deposits are not solidified and adhered due to heat change, the bearing portion can be prevented from being clogged.

  The third seal part 35 is sealed with the sealing liquid 36 stored in the storage chamber 21 of the water-sealed case 20, and since the sealing liquid has a specific gravity greater than that of water, it passes through the first and second sealing parts 15 and 25. Then, the groundwater that has entered the water sealing case 20 through the drive shaft 5 has a specific gravity smaller than that of the sealed liquid, and therefore can remain above the sealing liquid 6 and limit the penetration in the motor direction.

  As described above, in the submersible motor pump 1, since the motor 2 is always located in water and the rotational force of the motor shaft 3 is transmitted to the drive shaft 5, groundwater is transmitted through the drive shaft into the motor. Intrusion into the housing is unavoidable, the problem is that the life of the motor 2 is short, the first seal portion 15 in the suction case 10 through which the drive shaft 5 penetrates, Furthermore, by providing a third sealing portion 35 made of a sealing liquid 36 containing a liquid having a specific gravity greater than that of water in the water sealing case 20 and sealing the water in multiple stages, groundwater containing silt is transferred from the motor shaft 3 to the motor. In this case, the life of the motor can be extended by greatly delaying the time until the occurrence of a failure such as a rotation failure of the motor 2 after entering the motor 2.

  Therefore, since the life of the motor 2 can be extended at least until the impeller 40 is overhauled, the running cost can be reduced by reducing the number of maintenance of the submersible motor pump 1, which is very economical.

It is a principal part expanded sectional view of the submersible motor pump concerning this invention. It is a principal part expanded sectional view of a 1st seal part. It is a principal part expanded sectional view of a 2nd seal part. It is a principal part expanded sectional view of the conventional submersible motor pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Submersible motor pump 2 Motor 3 Motor shaft 5 Drive shaft 6 Shaft joint 10 Suction case 11 Inner cylinder 12 Upper end part 13 Bottom part 14 Suction port 15 First seal part 16 Umbrella sleeve 17 Chamfer part 20 Water seal case 21 Reservoir 22 Bearing portion 23 Water seal plate 25 Second seal portion 26 Inner ring 27 Proximity surface 28 Outer ring 29 Proximity surface 35 Third seal portion 36 Filled liquid 40 Impeller 41 Blade piece 45 Intermediate case 46 Water conduit 47 Inlet 48 Outlet

Claims (6)

An intermediate case (45) having a plurality of impellers (40) rotatably mounted at fixed intervals on a drive shaft (5) rotating in conjunction with the motor (2), and having a water conduit (46) on the inner wall surface Each intermediate case is individually accommodated in the inner case, the intermediate cases are connected in multiple stages according to the number of the impellers (40), an upper case having a check valve is attached to the uppermost stage, and the intermediate case ( 45) In the submersible motor pump (1) in which the suction case (10) is attached between the motor (2),
An umbrella sleeve that rotatably contacts the upper end (12) of the inner cylinder (11) with the drive shaft (5) passing through the center of the inner cylinder (11) provided at the center of the suction case (10). 16) A water seal case (20) for sealing the drive shaft (5) is interposed between the first seal part (15) formed by shaft attachment and the motor (2) and the suction case (10). A second seal portion (25) made of a labyrinth seal formed on a bearing portion (22) provided on the upper portion of the water seal case (20), and a storage chamber (21) provided in the water seal case (20). A drive shaft water seal device for a submersible motor pump, wherein a third seal portion (35) formed by sealing a sealing liquid (36) is provided.   The umbrella sleeve (16) constituting the first seal portion (15) of the suction case (10) is provided with a tapered chamfered portion (17) on the outer side of the upper surface, and the inner cylinder (11) is generally piled up. The underwater according to claim 1, characterized in that the lower part of the sleeve (13) formed in the hem of the mold is formed integrally with the bottom of the suction port (14) provided on the peripheral surface of the suction case (10). Motor pump drive shaft water seal device. The second seal portion (25) of the water seal case (20) includes a pair of male and female inner and outer rings (26),
(28), one inner ring (26) is fixed to the drive shaft (5), and the other outer ring (28) is attached to the bearing portion (22), and the adjacent surfaces (27), ( 29. The drive shaft water seal device for a submersible motor pump according to claim 1, wherein each of 29) is engaged in a non-contact state in a concavo-convex shape.   In the second seal portion (25), the clearance between the non-contact proximity surfaces (27) and (29) where the inner ring (26) and the outer ring (28) face each other is formed to be 0.03 to 0.07 mm. The drive shaft water seal device for a submersible motor pump according to claim 1 or 3, wherein   The third seal portion (35) is formed by sealing a liquid (36) having a specific gravity greater than that of water in a storage chamber (21) provided in the center of the water seal case (20). A drive shaft water seal device for a submersible motor pump according to claim 1.   The drive shaft water seal device for a submersible motor pump according to claim 1 or 5, wherein the sealing liquid (36) is silicon oil or propylene glycol in accordance with a motor use condition and a motor type.

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