JP5311675B2 - Seal for submersible pump - Google Patents

Description

  The present invention relates to a submersible pump seal that is fitted into a discharge port of a submersible pump having a discharge port that can be connected to a start end port of an existing drainage pipe so as to seal between the start end port.

  This type of submersible pump seal (hereinafter simply referred to simply as “seal”) is suspended in a manhole to drain rainwater or the like accumulated in the manhole, as disclosed in, for example, Patent Document 1. Used for submersible pumps. Here, in understanding the background art of the seal, the structure and usage of the drainage facility relating to the submersible pump for manholes shown in Patent Document 1 will be described as an example.

  As shown in FIG. 1 of Patent Document 1, at the bottom of the manhole (inside the tank), an existing drain pipe (detachable device base 1), and a guide pipe (8) suspended so as to rise from there Is permanently deployed. When drainage is required, guide the guide bracket (6) of the submersible pump (4) suspended by a chain or the like so that the submersible pump (4) is locked to the existing drain pipe (detachable device base 1). The operation of lowering while starting the guide state through the pipe (8) is started.

  Then, at the end of the descent of the submersible pump (4), as shown in the figure, the discharge port (discharge side flange 5) of the submersible pump (4) and the start end port (fixed side flange 2) of the existing drainage pipe This brings about a state of relative sliding up and down while sliding. And when it still descends, as shown in FIG. 3 of Patent Document 1, the discharge port (discharge side flange 5) and the start end port (fixed side flange 2) communicate with each other with their internal flow paths matched. In this state, the guide bracket (6) comes into contact with the starting end (fixed side flange 2), and the submersible pump (4) is configured to be in a set state when the descent of the submersible pump (4) is completed.

  In other words, since the guide bracket (6) abuts the starting end (fixed side flange 2), it uses the structural property that the submersible pump (4) swings and descends by its own weight as a fulcrum. By doing so, the discharge port (discharge side flange 5) and the start end port (fixed side flange 2) are strongly pressed against each other. And the above-mentioned seal (elastic body 7) is interposed between the discharge port (discharge side flange 5) and the start end port (fixed side flange 2), and water leaks (liquid leak) between them. Is preventing.

  As shown in FIG. 2 and FIG. 3 of Patent Document 1, the seal (elastic body 7) is a ring seal having an inward U-shaped cross-section, and the tip of the discharge port (discharge side flange 5). It is fitted and held in a concave ring part (where 5a and 5b are marked) formed in the part. In the free state, the lip portion of the seal (elastic body 7) (where A is marked) is in a state of protruding outward from the tip surface (flange end surface 5c) of the discharge port (discharge side flange 5). In the set state described above, the lip portion (where A is marked) is pressed and biased to the starting end port (fixed side flange 2), thereby elastically contacting the discharge port (discharge side flange 5). The starting end (fixed side flange 2) is sealed.

Japanese Utility Model Publication No. 56-149100

  However, as shown in Patent Document 1, in the means for fitting and attaching a ring-shaped seal to the start end port, it is necessary to make the seal correspond to the size and shape each time the start end port (submersible pump) is different in size and shape. There is a tendency to increase the product cost and the management cost because the mold becomes higher and a mold is required each time. Also, when the output of the submersible pump is high and the discharge reaction force is strong, the discharge port overcomes the urging force that abuts the start port by the weight of the submersible pump, and the discharge port moves away from the start port, thereby causing leakage. The pump pressure may be reduced. Also, rainwater contains foreign matter such as sludge, and if the fluid leaks from between the start port and the discharge port and at the same time the foreign material enters between them, the flange end surface will be damaged and the expensive flange end surface will be damaged. There is also a disadvantage that maintenance costs and repair / replacement costs increase.

  The object of the present invention is to further improve the structure and shape of the submersible pump so that no leakage occurs even if the discharge port of the submersible pump and the start port of the existing drainage pipe are slightly separated from each other. The goal is to develop and provide an improved seal for submersible pumps that prevents the intrusion of foreign matter between the two, and is compatible with differences in models and specifications, making it cheaper.

The invention according to claim 1 is an underwater having a discharge port 3A that can be connected to the starting end port 5A of the existing drainage pipe K, and a drainage channel for sending water to the existing drainage pipe K via the discharge port 3A. In the submersible pump seal that is fitted in the discharge port 3A of the pump P so as to seal between the start end port 5A,
A cylindrical member 1 made of an elastic material , and a reinforcing ring 2 that can be forcibly fitted by expanding the cylindrical member 1 and that is fitted in an inner circumferential groove 4 formed in the discharge port 3A are provided. And
The reinforcing ring 2 is fitted into the inner circumferential groove 4 by press fitting in a state in which the axial end 1A of the cylindrical material 1 is expanded and forcedly fitted to the reinforcing ring 2, and in this state, The other end 1B in the axial direction of the tubular member 1 is radially inward of the reinforcing ring 2 so that the other end 1B in the axial direction of the tubular member 1 is located inside the reinforcing ring 2 or in the drainage channel. The other end portion 1B in the axial direction of the folded tubular member 1 is moved to the inside of the existing drainage pipe K by the discharge water flow of the submersible pump P, and the It is configured to be pressed against the starting end corner portion 19 of the inner peripheral surface 5a .

  The invention according to claim 2 is the submersible pump seal according to claim 1, wherein the inner peripheral surface 2 a of the reinforcing ring 2 is formed on the inclined surface 18 whose inner diameter increases toward the lower side in the discharge direction. It is characterized by that.

  The invention according to claim 3 is the submersible pump seal according to claim 1, wherein the portion of the inner peripheral surface 2a of the reinforcing ring 2 that is on the upper side in the discharge direction is closer to the upper side in the discharge direction. It is formed in the inclined surface 17 which becomes large.

  The invention according to claim 4 is the submersible pump seal according to any one of claims 1 to 3, wherein the tubular member 1 is made of rubber and / or the reinforcing ring 2 is made of metal. It is a feature.

  According to the first aspect of the present invention, although described in detail in the section of the embodiment, due to the presence of the reinforcing ring that is forcibly fitted inside the cylindrical member, a strong discharge pressure acts and the seal moves or shifts. In order to prevent this, the submersible pump seal can be firmly fitted into the discharge port. The other end of the tubular member that is not externally fitted to the reinforcing ring is the start end of the existing water distribution pipe with a length in the axial direction in the drainage state where the submersible pump is attached to the existing water distribution pipe. Because it can enter, there is no foreign matter intrusion between the start port and the discharge port, the end surface of the flange is not damaged, and the maintenance, repair, and replacement costs for the expensive end surface of the flange can be reduced. Even if the submersible pump moves away from the existing water pipe due to a reaction force or the like, the other end remains in the start end and is effectively sealed. In addition, since the other end can be folded back to the inside of the diameter and positioned inside the reinforcing ring, when the submersible pump is moved and connected to the existing water distribution pipe, the other end is folded back. Thus, there is no inconvenience that the other end portion is obstructive and the mounting operation is difficult, or the other end portion is pinched and damaged, and the submersible pump can be set smoothly.

  As a result, further improvements in structure and shape can prevent leakage even if the discharge port of the submersible pump and the start end of the existing drainage pipe are slightly separated, but can also handle differences in models and specifications. It is possible to provide an improved submersible pump seal that is possible and cheaper. Further, according to the fourth aspect of the present invention, the seal can be inexpensively configured as a rubber tubular member and a metal reinforcing ring.

  According to the invention of claim 2, although described in detail in the section of the embodiment, the area of the side peripheral wall intersecting the axis at the other end of the cylindrical member that is extended by the discharge water flow is clear in the axial direction view. Will be increased. As a result, the pressure acting on the side peripheral wall is increased and the other end portion comes into stronger contact with the start end port, thereby obtaining an advantage that the sealing performance between the start end port of the existing pipe and the seal, that is, the discharge port is further strengthened. .

  According to the third aspect of the present invention, as described in detail in the section of the embodiment, drainage is performed on the other end portion that is folded and positioned inside the diameter of the reinforcing ring, and the radial gap between the other end portion and the discharge port inner peripheral surface. As a result, the pressure acting on the tubular material (pressure due to drainage) is further strengthened, and an excellent responsiveness of quickly switching from the folded state to the extended state can be obtained.

Overall side view showing drainage equipment for manholes Half sectional view showing a submersible pump seal (Example 1) (A) is an enlarged sectional view of the main part of the reinforcing ring, (b) is a half sectional view of the tubular material (A) is sectional drawing of the principal part which shows the seal | sticker at the time of submersible pump setting, (b) is sectional drawing of the principal part which shows the seal | sticker at the time of submersible pump use The seal | sticker of Example 2 is shown, (a) is sectional drawing which shows the seal | sticker at the time of submersible pump setting, (b) is sectional drawing which shows the seal | sticker at the time of submersible pump use. The seal | sticker of Example 3 is shown, (a) is sectional drawing which shows the seal at the time of a submersible pump set, (b) is sectional drawing which shows the seal at the time of submersible pump use.

  Embodiments of a submersible pump seal according to the present invention will be described below with reference to the drawings.

[Example 1]
FIG. 1 shows a manhole (tank) inside H in which a submersible pump P is set in an existing drain pipe K and a drainage operation is possible, that is, a drainage facility for manholes. The existing drainage pipe K includes an elbow pipe 5 attached to a support portion 8 fixed to the bottom 7 of the manhole interior H, and a pumping pipe 10, and the elbow pipe 5 includes a pair of guide pipes 11 rising from now on. 11 are suspended.

  The submersible pump P includes a motor unit 12, a vortex case 3, an electric wire 14, a hanging chain 15 and the like. The discharge port 3A, which is the end of the vortex case 3, has a guide portion 9 through which the guide pipes 11 and 11 can be inserted, and a hook portion that can be engaged with a hook portion 16 formed at the start end port 5A of the elbow pipe 5. 13 is formed. As a result, when the submersible pump P is lowered while the guide portion 9 is inserted into the guide pipe 11, the hook portion 13 is engaged with the hook portion 16, and the underwater pump P is engaged with the engaging portion as a virtual center. When the pump P swings and descends due to its own weight, the discharge port 3A is in surface contact with the start end port 5A being strongly pressed.

  As shown in FIG. 2, the seal S according to the first embodiment can be forcibly fitted by expanding the diameter of the rubber cylinder 1 (an example of a cylindrical material) 1 made of rubber (an example of an elastic material) and the rubber cylinder 1. A reinforcing ring 2, one end of the rubber cylinder 1 is expanded in diameter and forcibly externally fitted to the reinforcing ring 2, and the other end of the rubber cylinder 1 is folded inwardly to be positioned inside the reinforcing ring 2. It can be made [see FIG. 4 (a)].

  As shown in FIG. 3B, the rubber cylinder 1 has an outer diameter D1 (for example, 48 mm), an appropriate width in the axial center X direction (for example, 35 mm), and an appropriate wall thickness (for example: 1.5 mm). The outer diameter D1 is set to a small dimension that is equal to or smaller than the inner diameter d3 of the discharge port 3A of the vortex case 3 of the submersible pump P. The inner diameter d5 of the starting end 5A of the existing pipe K is set to the same diameter (d5 = d3) or substantially the same diameter (d5≈d3) as the inner diameter d3 of the discharge port 3A.

  For example, as shown in FIGS. 2 and 3A, the stainless steel reinforcing ring 2 has an inner diameter d2 that is the same as the inner diameter d3 of the discharge port 3A (d2 = d3) or slightly larger (d2> d3). Is set to Three outer peripheral grooves 2b are formed on the outer periphery of the reinforcing ring 2 along the circumferential direction, and each of the axial ends of the outer periphery is obliquely cut (for example, C0.5). The outer peripheral groove 2b is a V-shaped groove having a triangular cross-sectional shape with a sharp inner diameter, and is designed to enhance the catching action of the rubber tube 1 to be externally fitted to enhance the retaining action.

  In order to obtain the seal S with the rubber cylinder 1 and the reinforcing ring 2, as shown in FIG. 2, one end portion of the rubber cylinder 1 is enlarged and elastically press-fitted to the reinforcing ring 2. In this case, the end face 1t in the axial center X direction of the one end 1A of the rubber cylinder 1 is wrapped with the reinforcing ring 2 so as to be the inner peripheral face (the same diameter as each other). It is convenient to force-fit until As shown in FIG. 2, the other end 1B of the rubber cylinder 1 having the one end 1A fitted on the reinforcing ring 2 has an outer diameter in a free state suddenly due to its own elasticity from the position removed from the reinforcing ring 2. The shape is reduced to D1. When the rubber hardness of the rubber cylinder 1 is relatively hard, the diameter may gradually decrease.

  The state of the seal S as a product is that immediately after the rubber cylinder 1 and the reinforcing ring 2 are assembled, as shown in FIG. 2, one end 1A of the rubber cylinder 1 swells and the other end 1B remains as it is. That is, it becomes an extended state. When it is distributed as a product or attached to the submersible pump P, it may be in an extended state, but when used in the submersible pump P, the other end portion 1B of the rubber cylinder 1 is folded back inwardly, As shown to 4 (a), it shall be in the state located in the opposite direction inside the diameter of the reinforcement ring 2, ie, a folded state. This is because, as shown in FIG. 1, in order to drop the submersible pump P into the manhole along the guide pipe and set it in the existing drain pipe K, it is necessary to keep the seal S folded.

  As shown in FIGS. 1 and 4, the discharge port 3 </ b> A has a diameter d <b> 4 (d <b> 4> d <b> 3) larger than the diameter d <b> 3 of the inner peripheral surface 6, which is a drainage channel, and is opened at the end of the discharge port 3 </ b> A. An inner circumferential groove 4 in a state is formed. The width w4 of the inner circumferential groove 4 is set to be slightly longer than the width ws of the folded-back seal S, but may be set to be equal or slightly longer. The seal S in the folded state (or in the extended state) is fitted in the inner circumferential groove 4 by a pushing operation in the direction of the axis X. In this case, it is preferable to install by press-fitting (that is, the outer diameter d1 of the seal S> the inner diameter d4 of the inner circumferential groove 4) in terms of holding the discharge port 3A firmly, but in the press-fitted state or the same diameter or loosely. It is also possible to use a means of adhering with an adhesive or the like in a state where the inner fitting is inserted.

  As shown in FIG. 4A, the seal S of the submersible pump P set in the existing drain pipe K is in a folded state with the other end 1B facing the inside of the discharge port 3A, and the other end. An annular gap m exists in the radial direction between the tip of 1B and the inner peripheral surface 6 that is the drainage channel of the discharge port 3A. This is because the discharge port 3 </ b> A having the seal S is arranged at the start end port 5 </ b> A by moving the submersible pump P down in the manhole H and moving up and down. In addition, the seal S in FIG. 1 is drawn in a folded state (a state in which foreign matter easily enters between the start end port 5A and the discharge port 3A) and a lower portion in an extended state.

  When the submersible pump P in which the seal S shown in FIG. 4A is folded is activated to start pumping, that is, drainage, water flows from the discharge port 3A toward the start end port 5A. A strong resistance due to the water flow acts on the end portion 1B, and the other end portion 1B is forcibly folded back to the lower side in the drainage flow direction as shown in FIG. The extended state in this case is that the other end portion 1B is only stuck to the inner peripheral surface 5a of the start end port 5A due to the momentum of the flow, and is pressed against the start end corner portion 19 of the inner peripheral surface 5a. Thus, the other end 1B, that is, the rubber tube 1 and the start end 5A are sealed.

  In the drainage action state, as shown in FIG. 4B, the other end 1B has a certain length in the axis P direction. Therefore, even if the discharge reaction force is strong due to high output of the submersible pump and the discharge port moves away from the start end port by overcoming the urging force that the discharge port abuts on the start end port due to the weight of the submersible pump. The other end 1B still exists on the inner peripheral surface 5a of the starting end 5A so that a good sealing state is maintained, and the conventional problem that leakage occurs therefrom is solved. When the drainage operation is completed and the submersible pump is pulled up, the seal S is in the extended state (see FIG. 4B), but the rubber cylinder 1 is soft, so that the submersible pump P is moved upward. The starting end 5A can be passed through without any inconvenience due to elastic deformation.

  Since the seal S has a structure in which one end portion 1A of the rubber tube 1 is expanded and forcedly fitted to a strong reinforcing ring made of metal or the like, the number of parts is small, and the structure is simple and inexpensive. Can be produced. By making the outer diameter d1 of the one end 1A of the portion of the seal S fitted on the reinforcing ring 2 equal to or slightly smaller than the inner diameter d4 of the inner peripheral groove 4 of the discharge port 3A (d1 ≦ d4), the seal S Can be fitted into the inner circumferential groove 4 firmly and firmly without easily slipping out. This is because the reinforcing ring 2 is located on the inner side, and it can be realized that the discharge port 3A is firmly held while the seal S is simple in structure and inexpensive.

  For example, in the case where the seal is constituted only by a thickened rubber cylinder without waiting for the reinforcing ring, even if the rubber cylinder is a single article, the holding force is maintained even if it is press-fitted into the circumferential groove. It is not far away from the product. In that case, the wall thickness of the other end portion to be inserted into the start end port becomes excessive, making it difficult to be elastically deformed, and there is a possibility that the sealing performance during drainage may deteriorate. On the other hand, the seal S according to the present invention is excellent in that the rubber cylinder 1 having an appropriate thickness can be firmly held in the discharge port 3A.

[Example 2]
As shown in FIG. 5, the seal S according to the second embodiment is different from the seal S according to the first embodiment in that the inner circumferential surface 2a of the reinforcing ring 2 is inclined so that the inner diameter becomes larger toward the lower side in the discharge direction. It is a point formed in the surface, ie, the forward inner peripheral surface 18, and the others are basically the same. That is, as shown in FIGS. 5A and 5B, the diameter (inner diameter) d2 of the inner peripheral surface 2a of the reinforcing ring 2 on the upper side in the discharge direction is the same as in the first embodiment. The diameter (inner diameter) d6 of the lower end in the discharge direction of the inner peripheral surface 2a of No. 2 is set larger than the inner diameter d5 of the start end port 5A (d6> d5). The values of d2 and d6 can be set as appropriate.

  In this case, when the folded-back seal S shown in FIG. 5 (a) is in the extended state shown in FIG. 5 (b) by the discharge water flow, the side peripheral wall (inclined side peripheral wall) intersecting the axis P at the other end 1B. The area as viewed in the direction of the axis P of 1 s is clearly increased compared to the seal S of the first embodiment shown in FIG. Accordingly, the pressure acting on the side peripheral wall 1s is increased (see the hatched arrow a in FIG. 5B), and the rubber cylinder 1 is stronger at the corner portion of the inner peripheral surface 5a of the start end port 5A, that is, the start end corner portion 19. The seal portion 20 comes into contact with each other, and the sealability (leakage prevention) between the discharge port 3A and the start end port 5A and the prevention of foreign matter intrusion between the start end port 5A and the discharge port 3A are further improved. The advantage is enhanced.

  That is, when the seal S is configured and arranged so that the inner circumferential surface 2a of the reinforcing ring 2 becomes larger in diameter toward the lower side in the liquid feeding direction (fluid flow direction), the use state (drainage In this state, the flow rate of the liquid supply (drainage) spreads forward and the rubber cylinder 1 is pushed toward the end face side of the piping flange (starting end port 5A) by the taper of the inner peripheral face 18 (inclination with respect to the axis P of the inner peripheral face 2a) (strongly). The sealing performance is improved.

  When the folded other end 1B is set so as to stick to the inner peripheral surface 6 of the discharge port 3A [the state of the solid line in FIG. 5 (a)], the resistance to the other end 1B due to the discharge water flow is reduced. When it is difficult to obtain, it is convenient to set the other end 1B in the folded state so as to be separated from the inner peripheral surface 6 of the discharge port 3A inward in the radial direction, as indicated by a virtual line in FIG. It is. It becomes the same as that of the seal S according to the first embodiment, and it is possible to obtain a reliable reversal action by the discharge water flow at the other end 1B.

Example 3
As shown in FIG. 6, the seal S according to the third embodiment is different from the seal S according to the first embodiment in that the portion on the inner peripheral surface 2a of the reinforcing ring 2 that is on the upper side in the discharge direction is the upper side in the discharge direction. The portion of the inner peripheral surface 2a of the reinforcing ring 2 which is formed on the inclined surface whose inner diameter becomes larger as it approaches is closer to the lower side in the discharge direction on the inner peripheral surface 2a of the reinforcing ring 2 is on the lower side in the discharge direction This is in that the inner surface 18 is formed with an inclined surface whose inner diameter increases as it approaches, and the other is basically the same.

  The lengths in the axial center P direction of the tapered inner peripheral surface 17 and the expanded inner peripheral surface 18 are set to be equal or substantially equal (may not be equal), and the smallest inner diameter of the reinforcing ring in this case is the shaft. It is d2 at the center (or substantially the center) in the center P direction, and the largest inner diameter is d6 at both ends in the axis P direction. In the case of this embodiment, as shown in FIG. 6 (a), even if the radial gap m between the folded back other end 1B and the discharge port 3A is small, the drainage is as shown by the arrow b in FIG. If it flows in, the pressure receiving area in the direction of the axis P is large, so that it can be quickly and easily switched to the extended state as shown in FIG. That is, even without adopting a configuration in which the other end portion 1B is greatly extended radially inward from the inner peripheral surface 6 of the discharge port 3A, it is possible to obtain a switching behavior to an immediately extended state accompanying the start of drainage.

  Then, when the extended state shown in FIG. 6B is reached, due to the presence of the flared inner peripheral surface 18, the side peripheral wall (inclined side peripheral wall) 1s intersecting the axis P at the other end 1B is viewed in the direction of the axis P. The area is clearly increased compared to the seal S of Example 1 shown in FIG. Accordingly, the pressure acting on the side peripheral wall 1s increases (see the hatched arrow C in FIG. 6B), and the rubber cylinder 1 comes into stronger contact with the corner of the inner peripheral surface 5a of the start end port 5A. In addition, there is an advantage that the sealing property (leakage prevention property) between the seal S and the start end port 5A and the prevention of foreign matter intrusion between the start end port 5A and the discharge port 3A are further enhanced.

  In other words, in the seal S according to the third embodiment, the tapered inner peripheral surface 17 quickly switches the rubber tube 1 from the folded state to the extended state at the start of drainage, and has an advantage that the response is excellent, With the peripheral surface 18, the other end 1 </ b> B is strongly pressed by the corner of the inner peripheral surface 5 a of the start end port 5 </ b> A, and the advantage of improving the sealing performance can be obtained at a time.

[Another Example]
As the seal S, the outer diameter D1 in the free state of the rubber cylinder 1 is set to be equal to or slightly larger than the diameter d5 of the inner peripheral surface 5a of the start end port 5A, and the inner peripheral surface of the start end port 5 due to the extended state accompanying drainage It is also possible to improve the sealing performance by increasing the adhesion with 5a.

DESCRIPTION OF SYMBOLS 1 Cylindrical material 1A One end part 1B Other end part 2 Reinforcement ring 2a Inner peripheral surface 3A Discharge port 5A Starting end port 17 Inclined surface (protruding inner peripheral surface)
18 Inclined surface (conical inner surface)
K Existing drain pipe P Submersible pump

Claims (4)

Between the discharge port of the submersible pump having a discharge port that can be connected to the start port of the existing drainage pipe and a drainage channel for sending water to the existing drainage pipe through the discharge port, and between the start port A submersible pump seal fitted inside to seal
A cylindrical member made of an elastic material , and a reinforcing ring that can be forcibly fitted by expanding the diameter of the cylindrical member and is fitted in an inner circumferential groove formed in the discharge port ,
The reinforcing ring is fitted into the inner circumferential groove by press- fitting in a state where one end in the axial direction of the cylindrical material is expanded and forcedly fitted to the reinforcing ring, and in this state, the shaft of the cylindrical material is fitted. The other end side in the axial center direction of the cylindrical member is folded back toward the inside diameter of the reinforcing ring so that the other end portion in the central direction is located inside the reinforcing ring or in the drainage flow path. The other end in the axial center direction of the folded tube member is moved to the inside of the existing drainage pipe and pressed against the start end corner of the inner peripheral surface of the existing drainage pipe by the discharged water flow . Seal for submersible pump.   The submersible pump seal according to claim 1, wherein an inner peripheral surface of the reinforcing ring is formed on an inclined surface having an inner diameter that increases toward a lower side in a discharge direction.   The submersible pump seal according to claim 1, wherein a portion on the inner peripheral surface of the reinforcing ring that is on the upper side in the discharge direction is formed on an inclined surface that has an inner diameter that increases toward the upper side in the discharge direction.   The seal for submersible pumps according to any one of claims 1 to 3 in which said cylindrical material is made of rubber and / or said reinforcing ring is made of metal.

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