JP2011017324A - Seal structure and feed water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure and a feed water pump capable of preventing deterioration of sealing function of hermetic seal.SOLUTION: The pump 11 includes a mechanical seal 51 capable of preventing leakage of water within a pump chamber 32, and a hermetic seal 52 provided adjacent to the mechanical seal 51, as a seal structure 22 that prevents water from leaking from the clearance between the pump casing 20 and the rotary shaft 13, by hermetically sealing a clearance between a pump casing 20 and a rotary shaft 13. The sealing ring 56 includes a first sealing ring 68 provided on an inner diameter part 30b at small diameter side of a through hole 30, and a second sealing ring 69 which abuts against an end surface of the first sealing ring 68, and a third sealing ring 70 which supports the second sealing ring 69. The hermetic seal 52 is composed of the sealing ring 56 and grease filled into a space portion 71 formed by a tongue 69a of the first sealing ring 68, and the second sealing ring 69 and a rotary shaft 13.

Description

  The present invention relates to a seal structure for preventing water leakage and a water supply pump having the seal structure.

  Currently, as a device for supplying water to buildings, etc., it has a motor and a pump, and by connecting the rotating shaft of the motor to the impeller of the pump, the pump is driven by operating the motor, and water is supplied by the impeller. A water supply pump for increasing the pressure of water supply is known.

  Some of these water supply pumps use a mechanical seal or the like as a hermetic seal in order to prevent water leakage from the gap between the rotating shaft and the pump casing (see, for example, Patent Document 1). Further, as a water supply pump held by a circulation pump for supplying engine cooling water, a mechanical seal is provided between the pump and the drain chamber, and the rotary shaft can slide between the drain chamber and the output shaft bearing. Also known are those provided with an oil seal for sealing a fluid (see, for example, Patent Document 2). According to such a water supply pump, it is possible to prevent water from entering the bearing by the oil seal.

WO99 / 30039 pamphlet Japanese Utility Model Publication No. 63-32398

  The above-described water supply pump has the following problems. That is, in a water supply pump using a hermetic seal such as a mechanical seal, when the water in contact with the mechanical seal evaporates due to a long-term use stoppage, a precipitate in which contents such as calcium and chlorine contained in the water are precipitated is deposited. There is a risk of sticking to the mechanical seal. Such precipitates may hinder the rotation of the mechanical seal and may cause deterioration of the sliding surface due to sliding of the precipitates due to rotation. Moreover, there is a possibility that the mechanical seal may be fixed depending on the deposit state. Thereby, there exists a possibility that the sealing function of a mechanical seal may fall.

  Therefore, an object of the present invention is to provide a seal structure and a water supply pump that can prevent a decrease in the sealing function of the hermetic seal.

  In order to solve the above problems and achieve the object, the seal structure and the water supply pump of the present invention are configured as follows.

  As one aspect of the present invention, a gap between an insertion hole provided in a pressure vessel filled with fluid on its inner surface side and a rotating body that is partially inserted from the insertion hole to the inner surface side of the pressure vessel is sealed. A seal structure, provided in a gap between the rotary body inserted through the insertion hole and the insertion hole, and sealing a gap between the rotary body and the pressure vessel; and adjacent to the seal seal A first sealing ring provided in the insertion hole, a tongue piece which is provided on the rotary body so as to be rotatable with the rotation of the rotary body, and which slides on a side surface of the first sealing ring on the side surface thereof. A second sealing ring having an annular space formed by a side surface of the first sealing ring, the tongue, and an outer surface of the rotating body, and grease filled in the space. A sealing structure is provided, comprising: a sealing seal.

  As one aspect of the present invention, a motor having a stator and a rotor, a rotating shaft partially fixed to the rotor of the motor, an impeller fixed to the other part of the rotating shaft, and the impeller are accommodated A pump casing, a pump provided in the pump casing and having an insertion hole through which the rotating shaft is inserted, and the impeller being driven via the rotating shaft by rotation of the rotor, and the insertion hole And a sealing seal that seals a gap between the rotary shaft and the pump casing, and a first seal provided in the insertion hole adjacent to the fixed ring. 1st sealing ring, 2nd sealing ring which is provided in the said rotating shaft so that rotation is possible with rotation of the said rotating shaft, and has a tongue piece which slides on the side surface of the said 1st sealing ring, the said 1st 1 Side surface of sealing ring and tongue Space of annular shape formed by the outer surface of the rotary shaft, and a water supply pump, characterized in that it comprises a sealing seal having a grease, filled in the space portion is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the seal structure and water supply pump which can prevent reliably the sealing seals, such as a mechanical seal, can prevent the fall of the sealing function of a mechanical seal, and can improve maintainability. Can be provided.

Sectional drawing which shows the structure of the water supply pump using the seal structure which concerns on one embodiment of this invention. Sectional drawing which shows the structure of the seal structure.

  Hereinafter, a water supply pump 1 using a seal structure 22 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a cross-sectional view showing a configuration of a water supply pump 1 using a seal structure 22 according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the configuration of the seal structure 22. 1 and 2, B represents a bolt, E represents an installation floor, F represents a water flow path, P represents a packing, and N represents a nut.

  As shown in FIG. 1, the water supply pump 1 is provided with a base 10, a pump 11 fixed to the base 10, a motor 12 connected to the pump 11, and the rotation of the motor 12 so that the rotation of the motor 12 can be transmitted to the pump 11. A rotating shaft (rotating body) 13. The base 10 is formed to be installable on the installation floor E. The base 10 is formed so that the pump 11 can be fixed with a bolt or the like.

  The pump 11 includes a pump casing (pressure vessel) 20, an impeller 21 provided in the pump casing 20, and a rotating shaft 13, a part of which is located in the pump casing 20 and connected to the impeller 21. ing. Further, the pump 11 seals the gap between the pump casing 20 and the rotary shaft 13, thereby preventing the water filling the pump casing 20 from leaking from the gap between the pump casing 20 and the rotary shaft 13. 22 is provided.

  The pump casing 20 has, for example, a first case 24 having a recess 24a on its outer surface, and a recess 25a that faces the recess 24a on its outer surface. A second case 25 to be fixed. The pump casing 20 is formed by combining the first case 24 and the second case 25 so that the recesses 24a and 25a face each other. Further, the pump casing 20 includes a suction port 27 provided with a priming hole 27a and a check valve 27b, a discharge port 28, and a drain port 29.

  The first case 24 is provided with a suction port 27, a discharge port 28, and a drain port 29. In the first case 24, a flow path from the suction port 27 to the recess 24a is formed, and a flow path from the recess 24a to the discharge port 28 and the drain port 29 is formed. In addition, these flow paths are continuously formed through the recess 24a.

  The second case 25 has an insertion hole 30 through which the rotary shaft 13 is inserted. The insertion hole 30 is formed in a step shape having two different inner diameters. The insertion hole 30 has an inner diameter 30a positioned on the first case 24 side (the inner surface side of the pump casing 20) larger than an inner diameter 30b positioned on the motor 12 side (the outer surface side of the pump casing 20). . The inner diameters of these insertion holes 30 are all formed to be separated from the outer surface of the rotating shaft 13 by a predetermined distance.

  In the first case 24 and the second case 25, the recesses 24a and 25a are fixed to face each other, whereby a space formed by a combination of the recesses 24a and 25a, that is, the pump chamber 32 is formed.

  More specifically, the pump chamber 32 is a space formed by a combination of the recesses 24a and 25a when the first case 24 and the second case 25 are opposed to each other, and the impeller 21 can be stored therein. ing. The pump chamber 32 is continuous with the flow path from the suction port 27 of the first case 24 to the recess 24a. The pump chamber 32 is continuous with the flow path from the recess 24 a to the discharge port 28 and the drain port 29. In other words, the pump chamber 32 is formed in the pump casing 20, thereby forming a continuous flow path F from the suction port 27 to the discharge port 28 and the drain port 29 via the pump chamber 32.

  The impeller 21 is located on the suction side, and is fixed to the wall surface of the recess 24a in the pump chamber 32. The second shroud 37 is fixed to the rotary shaft 13 and has a plurality of blades 36. It has.

  The center of the first shroud 35 is opened, and this opening forms one of the flow paths F between the suction port 27 and the pump chamber 32, and forms a flow path to the center side of the second shroud 37. It is made possible. The second shroud 37 is restricted in the rotational direction by the rotary shaft 13 by a key or the like, and is fixed to be rotatable with the rotation of the rotary shaft 13. Further, the second shroud 37 is fixed to the rotating shaft 13 by a nut N or the like so as to prevent the rotating shaft 13 from being detached in the axial direction. A part of the seal structure 22 is provided between the second shroud 37 and the second case 25.

  The motor 12 is provided adjacent to the motor casing 40, the rotary shaft 13 partially disposed in the motor casing 40, the stator 41 provided in the motor casing 40, and the stator 41, And a rotor 42 fixed to the rotating shaft 13. The motor 12 is provided outside the motor casing 40, is connected to an external power source such as a power supply, and includes a control unit 43 connected to the stator 41. In addition, the motor 12 is fixed in the motor casing 40 and is provided with two bearings 44 that rotatably support (axially support) the rotary shaft 13.

  The motor casing 40 is formed by combining a plurality of cases. The stator 41 is fixed in the motor casing 40. The stator 41 is electrically connected to the control unit 43. That is, the stator 41 is formed so that the rotor 42 can be rotated by electric power supplied from the control unit 43.

  The rotating shaft 13 has one end side disposed in the pump 11 and the other end side disposed in the motor 12. The rotating shaft 13 is formed with a fixing portion 47 that can fix a part of the seal structure 22 at a part thereof.

  The fixed portion 47 is formed by steps of different outer diameters of the rotating shaft 13. The fixing portion 47 includes a small-diameter portion 47a on the insertion side into which a part of the seal structure 22 is inserted, and a large-diameter portion 47b that supports a part of the seal structure 22 by contacting the side surface thereof.

  Further, the rotary shaft 13 is formed so as to be capable of being fixed by fitting two bearings 44 provided between the rotary shaft 13 and the motor 12. The rotating shaft 13 has an outer diameter that differs depending on each position in order to provide not only the fixing portion 47 that fixes a part of the seal structure 22 but also each component. Omitted.

  The rotary shaft 13 is provided between a bearing 44 provided on the pump 11 side and the pump casing 20, and includes a flange portion 48 that prevents water from entering the gap between the motor casing 40 and the rotary shaft 13. . The flange 48 is formed in an annular thin plate shape that covers at least the gap between the motor casing 40 and the rotary shaft 13. That is, the gap between the motor casing 40 and the rotary shaft 13 is covered with the flange portion 48 in the axial direction of the rotary shaft 13. The shape of the flange portion 48 is not particularly limited as long as it is a shape that can prevent water scattered in the axial direction of the rotary shaft 13 from entering the gap between the motor casing 40 and the rotary shaft 13.

  The control unit 43 is formed so as to be connectable to an external power source and is capable of supplying power to the stator 41. Further, for example, the control unit 43 is formed so as to be able to vary the power supplied to the stator 41, and may have a so-called inverter function capable of varying the rotation speed of the rotating shaft 13.

  One of the two bearings 44 is provided on the pump 11 side of the motor casing 40, and the other is provided on the end portion side of the rotating shaft 13 located in the motor casing 40.

  The seal structure 22 includes a dynamic seal seal, for example, a mechanical seal 51, and a seal seal 52 provided adjacent to the mechanical seal 51, which can prevent leakage of water in the pump chamber 32. ing.

  Specifically, as shown in FIG. 2, the seal structure 22 includes a rotary ring 54 fixed to the rotary shaft 13, a fixed ring 55 fixed to the pump casing 20 and slidable with the rotary ring 54, And a sealing ring 56 fixed to the motor casing 12 side of the pump casing 20. The seal structure 22 is provided in the order of the rotating ring 54, the fixed ring 55, and the sealing ring 56 from the pump 11 side to the motor 12 side.

  The mechanical seal 51 includes the rotating ring 54 and the fixed ring 55. The sealing seal 52 is composed of a sealing ring 56 and grease provided on the sealing ring 56.

  The rotating ring 54 includes a first rotating ring 60 fitted (fixed) to the rotating shaft 13, a second rotating ring 61 provided on the first rotating ring 60 and sliding with the fixed ring 55, and a second rotation. And a spring 62 that presses the ring 61.

  The first rotating ring 60 is formed in a cylindrical shape having two different diameters. The first rotating ring 60 has a small inner diameter portion 60a in which a part of the inner periphery is fitted to the rotating shaft 13, and a large inner diameter portion formed so that the other part of the inner periphery can be fitted to the second rotating ring 61. 60b. The rotary shaft 13 is fitted to the small inner diameter portion 60a so that the gap between the inner peripheral surface and the outer peripheral surface of the rotary shaft 13 can be sealed (sealed). Thereby, the first rotating ring 60 rotates with the rotation of the rotating shaft 13.

  The first rotating ring 60 is formed such that the second rotating ring 61 can be fitted to the large inner diameter portion 60b. The first rotating ring 60 has a seat portion for the spring 62.

  The second rotating ring 61 is formed so that its outer diameter can be fitted into the large inner diameter portion 60 b of the first rotating ring 60, and its inner diameter is larger than the outer diameter of the rotating shaft 13. The second rotating ring 61 has a protrusion 61b having a sliding surface 61a. The first rotating ring 60 and the second rotating ring 61 are formed such that these gaps can be sealed by fitting the second rotating ring 61 to the large inner diameter portion 60 b of the first rotating ring 60.

  The sliding surface 61 a is formed so as to be slidable with the fixed ring 55. The cross-sectional shape of the protrusion 61b is a shape that can reduce sliding resistance, for example, a tapered shape in which the width of the sliding surface 61a is narrower than the width of the root of the protrusion 61b.

  The spring 62 is a so-called monocoil spring, and one end surface is disposed in contact with the second shroud 37 of the impeller 21 and the other end surface is in contact with the seat surface of the first rotating ring 60. The spring 62 presses the first rotating ring 60, that is, presses the rotating ring 54 with a predetermined spring force in a direction away from the impeller 21, thereby pressing the sliding surface 61 a against the fixed ring 55 with a predetermined pressure. It is made possible.

  The stationary ring 55 is provided on the large inner diameter 30 a side of the insertion hole 30 provided in the second case 25 of the pump casing 20. That is, the fixed ring 55 is located on the impeller 21 side (the inner surface side of the pump casing 20) of the insertion hole 30. The fixed ring 55 includes a first fixed ring 65 fitted into the insertion hole 30, and a sliding surface 66 a fitted into the first fixed ring 65 and sliding with the sliding surface 61 a of the second rotating ring 61. And a second stationary ring 66 having the same.

  The first fixed ring 65 is fitted in the insertion hole 30 so that the gap between the inner peripheral surface of the insertion hole 30 and the outer peripheral surface inserted into the insertion hole 30 can be sealed (sealed). The inner diameter of the first fixed ring 65 is formed larger than the inner diameter of the second fixed ring 66. The inner diameter of the second fixed ring 66 is slightly larger than the outer diameter of the rotating shaft 13. That is, the second fixed ring 66 is separated from the rotating shaft 13 with a small gap. Further, the first fixed ring 65 and the second fixed ring 66 are formed such that these gaps can be sealed by fitting the first fixed ring 65 and the second fixed ring 66.

  The sealing ring 56 is provided on the small-diameter inner diameter 30 b of the insertion hole 30 provided in the second case 25 and the rotary shaft 13. In other words, the sealing ring 56 is provided outside the second case 25 by being provided on the motor 12 side of the insertion hole 30.

  The sealing ring 56 includes a first sealing ring 68 provided on the inner diameter 30 b on the small diameter side of the insertion hole 30, a second sealing ring 69 that contacts the end surface of the first sealing ring 68, and the second sealing ring 68. And a third sealing ring 70 that supports the sealing ring 69. Further, the sealing ring 56 has a space 71 filled with grease.

  The first sealing ring 68 is a so-called bush and is fitted to the inner diameter 30 b of the second case 25. As a result, the first sealing ring 68 is fixed to the second case 25. The first sealing ring 68 has an inner diameter that is separated from the rotary shaft 13 with a small gap.

  The first sealing ring 68 is formed such that an end surface that contacts the second sealing ring 69 is slidable with the second sealing ring 69. Further, the first sealing ring 68 is formed with an accuracy capable of sealing the gap (fitting portion) between the first sealing ring 68 and the second case 25 by being fitted to the second case 25. . A hermetic seal such as an O-ring may be interposed between the second case 25 and the first sealing ring 68.

  Further, for example, such a first sealing ring 68 is formed of a material such as CAC (Copper Alloy Castings). The first sealing ring 68 is fitted to the inner diameter 30 b of the insertion hole 30 located on the outer surface side of the pump casing 20 adjacent to the first fixed ring 65.

  The second sealing ring 69 is a so-called dynamic sealing member, and is formed in an annular shape having a square cross section, and has a tongue piece 69 a on the end surface facing the first sealing ring 68. The second sealing ring 69 is made of a slidable resin material having elasticity such as nitrile rubber. The second sealing ring 69 is formed so as to be rotatable with the rotation of the rotation shaft 13 by being fitted to the small diameter portion 47 a of the rotation shaft 13. In addition, the second sealing ring 69 is formed so that the gap between the second sealing ring 69 and the rotary shaft 13 can be sealed by an inner peripheral surface that is in contact with the rotary shaft 13.

  The tongue piece 69a is formed in an annular shape that protrudes from the rotation shaft 13 side of the end face of the second sealing ring 69 toward the outer peripheral side of the second sealing ring 69 at a predetermined angle. The tip of this tongue piece 69 a abuts on the side surface of the first sealing ring 68 so as to be slidable.

  The third sealing ring 70 is a so-called sleeve and is fitted to the rotary shaft 13. For example, the third sealing ring 70 is fitted into the small diameter portion 47 a of the rotating shaft 13, one end surface thereof abuts on the second sealing ring 69, and the other end surface thereof is the large diameter portion 47 b of the rotating shaft 13. Abuts the side of Thus, the 3rd sealing ring 70 is formed so that positioning of the 2nd sealing ring 69 is possible by adjusting the length etc. of the axial center direction.

  The space 71 is formed in an annular shape having a substantially triangular cross section by the end face of the first sealing ring 68 facing each other, the tongue piece 69 a and the outer peripheral surface of the rotating shaft 13. The grease is filled in the space portion 71. For example, the grease has a viscosity that does not scatter even when the second sealing ring 69 rotates. For example, when using the water supply pump 1 for domestic water such as drinking water, such grease that does not adversely affect the human body should be used even if it is mixed with water. Thus, the type of grease can be set as appropriate according to the application of the water supply pump 1 and the like.

  According to the water supply pump 1 configured in this way, first, electric power is supplied from the control unit 43 to the motor 12 in order to increase the water supply by the water supply pump 1. The stator 41 rotates the rotor 42 by the supplied electric power. As the rotor 42 rotates, the rotating shaft 13 rotates.

  The impeller 21 disposed in the pump chamber 32 of the pump 11 rotates as the rotating shaft 13 rotates. That is, when the motor 12 is operated, the pump 11 is driven. The impeller 21 is rotated by driving the pump 11, and water is sucked from the center side of the first shroud 35 of the impeller 21, and the water sucked by the blades 36 is increased by the rotation of the impeller 21. The increased water is discharged from the side surface of the impeller 21 through the inside of the pump casing 20 to the secondary side of the feed water pump 1 from the discharge port 28.

  When the feed water pump 1 is driven, the pressure of the increased water pressure is applied to the pump chamber 32. At this time, leakage of water in the gap between the rotating shaft 13 and the second case 25 is prevented by the seal structure 22.

  Specifically, when the pump 11 is driven, in the seal structure 22, the rotating ring 54 rotates with the rotation of the rotating shaft 13, and the fixed ring 55 is fixed to the second case 25. For this reason, the sliding surface 61a of the protrusion 61b of the second rotating ring 61 and the sliding surface 66a of the second fixed ring 66 slide.

  The second rotating ring 61 is pressed toward the second fixed ring 66 by a spring 62 with a predetermined spring force. The second rotating ring 61 is sealed by sliding the sliding surfaces 61a, 66a while pushing the second fixed ring 66 with a predetermined force. That is, the gap between the rotary shaft 13 and the insertion hole 30 of the pump casing 20 is sealed by the mechanical seal 51, and the pump chamber 32 is sealed without leaking water filling the pump chamber 32.

  Further, as the rotation shaft 13 rotates, the second sealing ring 69 fixed to the rotation shaft 13 rotates, so that the first sealing ring 68 and the second sealing ring 69 slide. At this time, the second sealing ring 69 is positioned by the third sealing ring 70, and the tongue piece 69 a is pressed by the third sealing ring 70 with a predetermined force. It abuts on the first sealing ring 68.

  Since the second sealing ring 69 rotates in this state, the first sealing ring 68 and the second sealing ring 69 slide and the space portion 71 is filled with grease. Since the sealing ring 68 and the second sealing ring 69 are sealed, the outside air does not enter from the gap between the first sealing ring 68 and the rotary shaft 13.

  That is, the gap between the rotary shaft 13 and the second case 25 is sealed by the mechanical seal 51 and the sealing seal 52. Thus, the seal structure 22 prevents water in the pump chamber 32 from leaking to the outside, and prevents outside air from entering the pump chamber 32.

  Next, the stop time of the water supply pump 1 will be described. When the feed water pump 1 is stopped, the rotary shaft 13 is also stopped. For this reason, the mechanical seal 51 causes the water in the pump chamber 32 to pass through the gap between the second case 25 and the rotary shaft 13 by the contact between the rotary ring 54 and the fixed ring 55 by the pressing of the rotary ring 54 by the spring 62. To prevent leakage.

  Since the water pressure in the pump chamber 32 at this time is reduced by stopping the driving of the pump 11, the mechanical seal 51 can be sealed by the spring 62. Even if the water in the pump chamber 32 leaks from the rotating ring 54 and the stationary ring 55 of the mechanical seal 51 to be stopped, the water is caused by the first sealing ring 68, the second sealing ring 69, and the grease of the sealing seal 52. The water does not leak from the pump casing 20 to the outside. That is, leakage of water in the pump chamber 32 to the outside is prevented by the mechanical seal 51 and the sealing seal 52.

  The sealing seal 52 does not allow outside air to enter the pump chamber 32 due to the first sealing ring 68, the second sealing ring 69, and grease. For this reason, the water in the pump chamber 32 is not exposed to the outside air. In particular, water filled between the sealing seal 52 and the mechanical seal 51 and / or between the pump chamber 32 and the mechanical seal 51 is not exposed to the outside air. For this reason, evaporation of the water located in these is prevented.

  Further, even if the first sealing ring 68 of the sealing seal 52 is worn by use of the water supply pump 1 and the sealing performance of the sealing seal 52 is deteriorated, the replacement of the first sealing ring 68 or the first The sliding surface of the sealing ring 68 may be reworked.

  For example, when a change in the thickness of the first sealing ring 68 due to reworking of the first sealing ring 68 occurs, it can be dealt with by replacing or adding the third sealing ring 70. That is, by adjusting the third sealing ring 70 that is a spacer, the second sealing ring 69 can be pressed against the first sealing ring 68 with a predetermined pressure. For this reason, the maintainability of the sealing seal 52 is improved, and the maintenance cost can be reduced.

  Even if the sealing function is deteriorated or lost due to breakage of the mechanical seal 51 and the sealing seal 52, the water leaked from the gap between the rotary shaft 13 and the second case 25 is not removed from the rotary shaft. 13 prevents the water from entering the motor 12. That is, the flange portion 48 prevents water from entering the motor casing 40 from the gap between the motor casing 40 and the rotating shaft 13. For this reason, when the bearing 44 is exposed to water, it becomes possible to prevent the function of the bearing 44 from being deteriorated.

  According to the water supply pump 1 using the seal structure 22 configured as described above, water around the mechanical seal 51 that prevents water leakage of the pump 11 is not exposed to the outside air. For this reason, it becomes possible to prevent evaporation of water around the mechanical seal 51.

  In particular, when such a mechanical seal 51 is used, when water around the mechanical seal 51 evaporates, inclusions such as minerals contained in the water are deposited. If the deposit deposited from the inclusions adheres to the mechanical seal 51, the rotation of the rotating ring 54 of the mechanical seal 51 may be hindered, and the deposit may damage (scratch) the sliding surfaces 61a and 66a. There is a possibility that the sealing performance may be lowered due to the inhibition of sliding.

  However, it is possible to prevent the sealing function of the mechanical seal 51 from being lowered by preventing the evaporation of water by the seal structure 22. Thus, the sealing function of the seal structure 22, in particular, the mechanical seal 51 can be maintained, the reliability of the mechanical seal 51 is improved, and the reliability of the pump 11 is also improved.

  Even when water leaks from the gap between the rotary shaft 13 and the insertion hole 30 due to a reduction in the sealing function of the seal structure 22, the flange portion 48 blocks the water in the axial direction of the rotary shaft 13. Therefore, it is possible to prevent water from entering the motor 12. As described above, the flange 48 prevents water from entering the bearing 44. Similarly, water does not enter the motor casing 40. The collar portion 48 prevents the ingress of water into the motor 12, thereby preventing a decrease in the function of the motor 12 and preventing a decrease in the life of the motor 12.

  Further, the sealing seal 52 is slid by sliding because the second sealing ring 69 is configured to slide with the first sealing ring 68 instead of the shaft seal or the like that slides on the rotary shaft 13. The wear surface to be used becomes a sliding portion of the first sealing ring 68 and the second sealing ring 69. Thereby, the rotating shaft 13 is not worn by sliding.

  That is, since wear due to sliding becomes a component of the sealing seal 52, if there is a decrease in the sealing function due to driving of the water supply pump 1, either the sealing seal 52 is replaced or reworked. As a result, the replacement cost can be reduced and the maintainability is improved.

  In addition, by providing the fixed portion 47 on the rotary shaft 13 and positioning the sealing seal 52, it is possible to make a simple configuration without any other configuration, and reliability associated with an increase in the number of components can be achieved. It is possible to prevent the decrease.

  As described above, the life and reliability of the feed water pump 1 can be improved.

  As described above, according to the water supply pump 1 using the seal structure 22 according to the present embodiment, it is possible to prevent deposits from adhering to the mechanical seal 51, and to reduce the sealing function of the mechanical seal 51. It becomes possible to prevent. Moreover, it becomes possible to prevent the sealing function from being lowered, the life of the mechanical seal 51 is improved, and the number of replacements can be reduced.

  The sealing seal 52 may be replaced or reworked even if the sealing function is deteriorated due to wear or the like of the sliding portion between the first sealing ring 68 and the second sealing ring 69. Good sex. Furthermore, even if the sealing function of the sealing structure 22 is stopped, it is possible to prevent water from entering the motor 12 by the collar portion 48, and the reliability of the motor 12 can be improved. From these things, the feed water pump 1 has high reliability and can have a long life.

  The present invention is not limited to the above embodiment. For example, in the example described above, the spring 62 used for the mechanical seal 51 is a monocoil spring, but is not limited thereto. In other words, the mechanical seal 51 may be a multi-spring and may have a structure in which a plurality of springs are uniformly arranged on the circumference. The mechanical seal 51 may be an unbalanced type or a balanced type. However, the mechanical seal 51 is preferably a so-called insight type in which the rotary ring 54 is located on the inner surface side of the pump casing 20.

  In the above-described example, the mechanical seal 51 is used as the hermetic seal. However, for example, a hermetic seal capable of sealing another rotating sliding portion may be used. That is, if there is a possibility that the water around the sealing seal touches the outside air and precipitates are deposited on the sealing seal, which may reduce the sealing performance of the sealing seal, the sealing seal 52 can be used. Even when a hermetic seal is used, it is possible to obtain the effect of preventing the deterioration of the sealing function as in the case where the mechanical seal 51 is used.

  In the above-described example, the third sealing ring 70 is used as the sealing ring 56 of the sealing seal 52, but the present invention is not limited to this. The third sealing ring 70 positions the second sealing ring 69 with respect to the first sealing ring 68 so as to be a predetermined pressure. That is, if the second sealing ring 69 can be positioned by the fixed portion 47 of the rotating shaft 13, the third sealing ring 70 may not be used.

  For example, the third sealing ring 70 is not provided when the water supply pump 1 is shipped. Due to wear of the sliding surface due to sliding of the first sealing ring 68 and the second sealing ring 69 due to the use of the water supply pump 1, it is difficult to position the second sealing ring 69 at the fixed portion 47 of the rotating shaft 13. In this case, the third sealing ring 70 may be inserted. With such a configuration, positioning of the second sealing ring 69 is facilitated, and maintenance is improved.

  Further, in the above-described example, the second sealing ring 69 having the tongue piece 69a is used. However, the shape of the tongue piece 69a is not limited to the above-described shape. For example, the structure which has the recessed part with which grease is filled in the sliding surface of the 1st sealing ring 68 and the 2nd sealing ring 69 may be sufficient. That is, it is possible to seal the outside air on the outer surface side of the pump casing 20, to set a predetermined amount of grease, that is, to be able to fill an appropriate amount when the water supply pump 1 is used, and to prevent scattering of the grease. If it is.

  In the above-described example, the first sealing ring 68 is separated from the pump casing 20 and provided in the insertion hole 30. However, the present invention is not limited to this. The first sealing ring 68 only needs to be able to seal with the sliding surfaces of the first sealing ring 68 and the second sealing ring 69 by sliding with the second sealing ring 69. The sealing ring 68 may be integrated with the pump casing 20. However, in the case where the pump casing 20 and the first sealing ring 68 are integrated, the material of the casing cover 20 needs to be a material that has good slidability and sealability with the second sealing ring 69. In addition, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Water supply pump, 10 ... Base, 11 ... Pump, 12 ... Motor, 13 ... Rotary shaft (rotary body), 20 ... Pump casing (pressure vessel), 21 ... Impeller, 22 ... Seal structure, 24 ... First case, 24a ... recess, 25 ... second case, 25a ... recess, 27a ... expiratory hole, 27b ... check valve, 27 ... suction port, 28 ... discharge port, 29 ... drain port, 30 ... insertion hole, 32 ... pump chamber 35 ... 1st shroud, 36 ... Blade | wing, 37 ... 2nd shroud, 40 ... Motor casing, 41 ... Stator, 42 ... Rotor, 43 ... Control part, 44 ... Bearing, 47 ... Fixed part, 47a ... Small diameter part 47b ... large diameter part, 48 ... collar part, 51 ... mechanical seal (sealing seal), 52 ... sealing seal, 54 ... rotating ring, 55 ... stationary ring, 56 ... sealing ring, 60 ... first rotating ring, 60a ... small inner diameter part, 60b ... large inner diameter part, DESCRIPTION OF SYMBOLS 1 ... 2nd rotation ring, 61a ... Sliding surface, 61b ... Projection part, 62 ... Spring, 65 ... 1st fixed ring, 66 ... 2nd fixed ring, 66a ... Sliding surface, 68 ... 1st sealing ring, 69 ... 2nd sealing ring, 69a ... Tongue piece, 70 ... 3rd sealing ring, 71 ... Space part, B ... Bolt, E ... Installation floor surface, F ... Flow path, P ... Packing, N ... Nut.

Claims (6)

A seal structure that seals a gap between an insertion hole provided in a pressure vessel filled with fluid on the inner surface side thereof, and a rotating body that is partially inserted from the insertion hole to the inner surface side of the pressure vessel.
A sealing seal provided in a gap between the rotating body and the insertion hole inserted through the insertion hole, and sealing a gap between the rotating body and the pressure vessel;
A first sealing ring provided in the insertion hole adjacent to the hermetic seal, provided on the rotating body so as to be rotatable with the rotation of the rotating body, and on a side surface of the first sealing ring A second sealing ring having a sliding tongue piece, an annular space formed by a side surface of the first sealing ring, the tongue piece, and an outer surface of the rotating body; and the space part is filled. A sealing seal comprising grease,
A seal structure comprising: The hermetic seal and the hermetic seal are the insertion holes, and are located on the inner surface side and outer surface side of the pressure vessel, respectively.
The seal structure according to claim 1, wherein an outer surface side of the pressure vessel is exposed to outside air. The hermetic seal is
A rotating ring provided on the rotating body inserted through the insertion hole, and rotatable with the rotation of the rotating body;
An insertion hole of the pressure vessel, and a fixed ring that is provided adjacent to the first sealing ring on the inner surface side of the pressure vessel, and is slidable with the rotary ring;
A spring that presses the rotating ring against the stationary ring with a predetermined spring force;
The mechanical seal that seals the gap between the stationary ring and the rotating ring by sliding the stationary ring and the rotating ring when the rotating ring rotates. The seal structure described. A motor having a stator and a rotor;
A rotating shaft partially fixed to the rotor of the motor;
An impeller fixed to the other part of the rotating shaft, a pump casing that houses the impeller, and an insertion hole that is provided in the pump casing and allows the rotating shaft to pass therethrough. A pump in which the impeller is driven via a shaft;
A sealing seal provided in a gap between the insertion hole and the rotating shaft inserted through the insertion hole, and sealing a gap between the rotating shaft and the pump casing;
A first sealing ring provided in the insertion hole adjacent to the fixed ring, provided on the rotary shaft so as to be rotatable in accordance with the rotation of the rotary shaft, and on a side surface of the first sealing ring A second sealing ring having a sliding tongue piece, an annular space formed by a side surface of the first sealing ring, the tongue piece, and an outer surface of the rotary shaft; and the space part is filled. A sealing seal comprising grease,
A water supply pump comprising: The sealing seal and the sealing seal are the insertion holes, and are located on the inner surface side and the outer surface side of the pump casing, respectively.
The water supply pump according to claim 4, wherein an outer surface side of the pump casing is exposed to outside air. The hermetic seal is
A rotating ring provided on the rotating shaft inserted through the insertion hole, and rotatable with the rotation of the rotating shaft;
The insertion hole, provided on the inner surface side of the pump casing, and a fixed ring slidable with the rotating ring,
A spring that presses the rotating ring against the stationary ring with a predetermined spring force;
6. The mechanical seal that seals a gap between the rotating ring and the stationary ring by sliding the stationary ring and the rotating ring when the rotating ring rotates. The water supply pump described in 1.

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