JPH11294594A - Leakage loss reducing mechanism of pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sufficient and stable seal effect by fixing a ring member to the opposite face of a rotary object to a fixed object, and utilizing the deformation of the ring member by centrifugal force for sealing to seal between the rotary object and fixed object of a pump and reduce the leakage loss of an operating liquid. SOLUTION: A rotary shaft 2 and an impeller 10 are rotated during the operation of a pump, a ring member 13 fixed to an impeller mouth ring 10b is integrally rotated, and centrifugal force is applied to the outer peripheral ring section 16 of the ring member 13. An elastic connecting ring section 15 with a C shaped cross section is deformed to be extended to the outside direction, the outer surface 16a of the outer peripheral ring section 16 approaches a fixed wall section 8, and the gap δ2 between them is made smaller than the gap in the stationary state of the pump. If the size of the gap δ2 is set to a quantity that a liquid film 17 made of an oil film by an operating liquid is formed in it, both sides of the ring member 13 are sealed, and the leakage of the operating liquid is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the sealability between rotating and fixed objects between pump stages of a multi-stage pump and the shaft sealing device of various pumps, for example, to reduce leakage loss of handled liquid. The present invention relates to a pump leakage loss reducing mechanism that can be operated.

[0002]

2. Description of the Related Art Generally, a multi-stage pump is, for example, shown in FIG.
And a multi-stage pump section 3 (referred to as a pump section 3) that shares the rotation shaft 2 and is formed from an engagement hole between the partition fixing walls 8 of each pump step section 7. By sequentially joining the fixed joint portion 9 and the sliding joint portion 11 formed by a passage in the direction of the rotating shaft 2 between the partition fixed wall portion 8 and the rotating boss portion 10a (see FIG. 20) of the impeller 10 (see FIG. 20). It is multistage. In FIG. 19,
Reference numeral 4 denotes a balance disk portion, reference numeral 5 denotes a shaft sealing device, and reference numeral 6 denotes a bearing.

Conventionally, in the sliding joint 11 of each pump step 7, a sealing structure is provided on the sliding joint 11 in order to prevent leakage of the handling liquid from the high pressure side to the low pressure side. The sealing structure is provided, for example, as a sealing structure using a wailing 51 shown in FIGS. 20A to 20C or a labyrinth 52 shown in FIG.
2A or a seal structure using a V-ring 53 (or U-ring) shown in FIG.
U-shaped member 5 fixed to partition fixing wall 8 shown in FIG.
4 is adopted.

[0004]

However, FIG.
In the seal structure using the wailing 51 and the labyrinth 52 shown in FIG. 1, since it is necessary to accurately manage the gap formed between the partition fixing wall portion 8 and the impeller 10, which are seal members, the dimensions of these members are reduced. Machining costs are required due to the demanding processing accuracy with tight tolerances,
When the axis of the rotating shaft 2 for rotating the impeller 10 is misaligned, the impeller 10 comes into contact with the partition fixing wall 8 with a large force so that the gap is not constant and leakage of the handling liquid is reliably prevented. There is a problem that it may be difficult to perform the operation.

Further, in the sealing structure using the V ring 53 shown in FIG. 21A, the tip of the V ring 53 or the U ring is always in contact with the rotating boss 10a of the impeller 10, so that the impeller 10 There is a problem that the load is always applied to the pump 1 and the load at the time of starting the pump 1 tends to increase.

Further, in the seal structure shown in FIG. 21B, although the problems of each seal structure shown in FIG. 20 can be solved, a sufficient pressure is not generated in the liquid to be handled by the rotation of the impeller 10. Since no predetermined pressure acts on the U-shaped member 54 in the direction indicated by the arrow C in FIG.
Cannot maintain a predetermined gap with respect to the impeller 10, and the sealing function is not established.

Therefore, in this sealing structure, it is necessary to change the material hardness and the like of the U-shaped member 54 in consideration of a low head and a high head, and the pressure acting on the U-shaped member 54 is reduced. In addition, the inner shape of the partition fixing wall 8 of the sliding joint 11 forming the flow path of the handling liquid and the shape of the impeller 10 are easily affected, and a sufficient and stable sealing effect is obtained for the sliding joint 11. There is a problem that it may be difficult.

The present invention has been made in view of such circumstances, and an object of the invention described in claims 1 to 3 is to obtain a sufficient and stable sealing effect between a rotating member and a fixed member during operation of a pump. Another object of the present invention is to provide a pump leakage loss reducing mechanism that can reduce the leakage loss of the handled liquid and reduce the load at the time of starting the pump and prevent the sliding portion from being worn. Further, the object of the invention described in claim 4 is, in addition to the objects of the inventions described in claims 1 to 3, in addition to being able to sufficiently reduce the leakage loss at the sliding joint between the respective pump steps of the multi-stage pump. An object of the present invention is to provide a pump leakage loss reduction mechanism that can be easily assembled and maintained. Another object of the present invention is to provide a pump sealing loss reduction mechanism as a shaft sealing part auxiliary mechanism capable of reducing leakage of a handling liquid so as to obtain a sufficient and stable sealing effect on a shaft sealing device portion of the pump. Is to provide. The object of the invention described in claim 6 is, in addition to the objects of the invention described in claims 1 to 5,
An object of the present invention is to provide a pump leakage loss reduction mechanism that can obtain a more sufficient and stable sealing effect by restricting deformation of a ring member.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a mechanism for sealing between a rotating member and a fixed member of a pump to reduce a leakage loss of a handling liquid. Then, a ring member is fixed to the surface of the rotating object facing the fixed object, the ring member is deformed by centrifugal force due to the rotation of the rotating object, and the deformed ring member seals between the rotating object and the fixed object. It is characterized by.

[0010] With this configuration, when a rotating member such as an impeller of the pump rotates, the ring member fixed to the rotating member also rotates integrally, and the ring member is rotated by centrifugal force due to rotation. Deform. Due to the deformation of the ring member, the outer peripheral portion of the ring member moves outward, and the elastic force of the ring member keeps the gap between the rotating object and the fixed object constantly constant. A seal is provided between the object and the fixed object, and leakage of the handling liquid is reliably prevented. In addition, when the pump does not rotate, the ring member does not deform outward due to centrifugal force and does not contact the fixed object, so that the load applied to the rotating object at the time of starting the pump is reduced, that is, the starting torque is reduced. At the same time, wear due to solid lubrication in the initial stage of the start of the interstage seal is reduced.

According to a second aspect of the present invention, the ring member projects outwardly through a fitting ring portion which is fitted and fixed to a rotary member of the pump, and a connecting ring portion having elasticity to the fitting ring portion. The ring member seals between the rotating object and the fixed object by deforming at least the connecting ring portion by centrifugal force generated by the rotation of the rotating object.

[0012] With this configuration, the ring member is fixed by fitting the fitting ring portion to the rotating object, and the connecting ring portion provided on the fitting ring portion so as to protrude outward is provided with the rotating member. It is deformed to extend outward by the centrifugal force of The rotating member and the fixed member are sealed by the outer peripheral ring portion of the deformed ring member.

According to a third aspect of the present invention, the ring member is formed by a bag-like ring member having elasticity and a moving body accommodated in the ring member, and the ring member moves by centrifugal force caused by rotation of the rotating object. The ring member is deformed when the body moves outward, and the deformed ring member seals between the rotating object and the fixed object.

With such a configuration, when the bag-shaped ring member fixed to the rotating object rotates integrally with the rotating object, the centrifugal force is applied to the moving body accommodated in the bag-shaped ring member. Acting, the moving body moves outward in the ring member, and the outer peripheral portion of the ring member is deformed so as to extend outward. For example, the outer peripheral portion seals between the rotating object and the fixed object.

According to a fourth aspect of the present invention, the pump comprises
A fixed joint formed from an engagement hole between the partition fixed walls of each pump step, and a sliding joint formed from a passage in the rotation axis direction between the partition fixed wall and the rotary boss of the impeller. , And is characterized in that the ring member is fixed to the rotating boss portion of the impeller.

With such a configuration, in each sliding joint of the multi-stage pump in which each pump step is sequentially joined via the fixed joint and the sliding joint, for example, the impeller rotating boss portion, for example, the impeller The ring member fixed to the mouth ring is deformed by centrifugal force caused by rotation of the impeller. Thereby, the space between the impeller and the partition fixing wall portion is sealed, and the ring member can be fixed simply by being fitted into the rotating boss portion of the impeller, so that the pump can be easily assembled and maintained.

The invention according to claim 5 is a mechanism for reducing leakage loss of a handling liquid from a shaft sealing device portion of a pump having a shaft sealing device in a shaft penetrating portion in which a rotating shaft penetrates a fixed object. , Fix the ring member to the shaft sealing device part of the rotating shaft,
The ring member is deformed by centrifugal force due to rotation of the rotating shaft,
The deformed ring member reduces the pressure generated by the pump applied to the shaft sealing device and assists the sealing mechanism.

With this configuration, the rotating shaft has a shaft sealing device at a shaft penetrating portion penetrating the fixed object. For example, in the case of a single-stage pump, the rotating shaft is fixed to the rotating shaft by rotating. The existing ring member is deformed by the centrifugal force. The deformation of the ring member seals between the rotating shaft and the fixed object of the shaft sealing device portion, and the ring member can assist the sealing mechanism by the shaft sealing device, and the shaft sealing device portion has a sufficient and stable sealing effect. can get.

The invention according to claim 6 is characterized in that the ring member is provided with a restricting member for restricting deformation in the direction of the fixed object due to centrifugal force. With this configuration, when a centrifugal force acts on the ring member by rotation of the rotating object, the ring member attempts to deform in the direction of the fixed object, but this deformation is limited by the restricting member provided on the ring member. For example, strong contact with the fixed object is prevented.
Thereby, the deformation of the ring member becomes more appropriate, and for example, the sealing effect between the rotating object and the fixed object is more stable and improved.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a preferred embodiment of a pump leakage loss reducing mechanism according to the present invention. For the sake of convenience, the same components as those shown in FIG. 19 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The basic configuration of the leakage loss reduction mechanism according to the present invention is as follows. A ring member as a seal member is replaced with a rotary boss 1 of the impeller 10 as a rotary member of a pump.
The impeller mouth ring of No. 0a is characterized in that the ring member is deformed by centrifugal force due to the rotation of the impeller 10 during the operation of the pump, and the gap between the fixed wall 8 and the fixed member is kept constant.

FIGS. 1 to 4 show a first embodiment of the leakage loss reducing mechanism. FIG. 1 is an exploded perspective view of a sliding joint when applied to the multi-stage pump 1, and FIG. FIG. 3 is an enlarged cross-sectional view, FIG. 3 is an enlarged view of a portion A in FIG. 2, and FIG. The leakage loss reducing mechanism according to the first embodiment includes a fitting ring 14, a connecting ring 15 and an outer ring 16.
Has an annular ring member 13 integrally formed.

In the ring member 13, the fitting ring portion 14 is formed to have a predetermined length (width), and the fitting ring portion 14 is provided at a substantially central position in the longitudinal direction of the fitting ring portion 14 in the outward direction (in the direction of the partition fixing wall portion 8). A connecting ring portion 15 having a substantially C-shaped cross section is provided so as to protrude toward the connecting ring portion 1.
An outer peripheral ring portion 16 having a substantially circular cross section is provided at the tip of the fifth member 5.

The ring member 13 is made of natural rubber, NBR, E
It is made of an elastic material such as PDM, silicon, various elastomers, etc., and its fitting ring 14 and connecting ring 1
5 and the outer peripheral ring portion 16 are integrally formed, so that the whole has a required elasticity. Also, the inner diameter R1 of the fitting ring portion 14 of the ring member 13 (see FIG. 1).
Is set slightly smaller than the outer diameter R2 of the impeller mouth ring 10b of the rotating boss 10a of the impeller 10, and the ring member 13 is fitted and fixed to the impeller mouth ring 10b by the self-tightening action of the fitting ring 14. In addition, as a method of fixing the ring member to the impeller 10, for example, the ring member 13 can be integrally formed with the impeller 10 (two-stage injection molding of different materials).

The ring member 13 is fitted into and fixed to the impeller mouth ring 10b of the impeller 10, and the multi-stage pump 1 constituting the pump casing is fixed.
(Hereinafter, referred to as a pump 1) disposed between the fixed walls 8 (hereinafter, referred to as fixed walls 8) of the respective pump steps 7;
When the pump 1 shown in FIG.
A predetermined gap δ1 is set between the outer surface 16a of the outer peripheral ring portion 16 and the fixed wall portion 3.

According to the leakage loss reducing mechanism of the first embodiment, the impeller 10 does not rotate when the pump 1 is stationary, so that the gap δ1 is formed between the outer peripheral ring portion 16 of the ring member 13 and the fixed wall portion 8. It is formed and the sealing function is not acting on the ring member 13. When the pump 1 is in the operating state, the impeller 10 rotates, the ring member 13 fixed to the impeller mouth ring 10b also rotates integrally, and centrifugal force acts on the outer peripheral ring portion 16 of the ring member 13.

By the action of the centrifugal force on the outer peripheral ring 16, the connecting ring 16 having a C-shaped cross section having elasticity is formed.
As shown in FIG. 4, the outer ring 16 is deformed so as to extend outward, and the outer surface 16a of the outer ring 16 approaches the fixed wall 8 to form a gap δ2 (δ1> δ2). The material, hardness, shape, and outer peripheral ring portion 16 of the connection ring portion 15 are such that the gap δ2 has a dimension (for example, 0.1 mm) such that a liquid film 17 made of an oil film or the like by a handling liquid is formed in the gap δ2. The liquid film 17 seals both sides of the ring member 13 and prevents the handling liquid from leaking in the direction indicated by the arrow A in FIG. 4 (from the high pressure side to the low pressure side). You. Further, the load on the motor caused by the frictional resistance due to the sliding of the ring member 13 when the pump 1 is started is reduced.

As described above, according to the leakage loss reducing mechanism of the first embodiment, the ring member 13 having a sealing function is
Impeller 10 which is a rotating object of each pump step 7 of pump 1
And the ring member 13 is deformed by centrifugal force caused by the rotation of the impeller 10, thereby setting a gap δ 2 between the outer surface 16 a of the outer peripheral ring portion 16 of the ring member 13 and the fixed wall portion 8, thereby setting the liquid film 17. Can be formed.

For this reason, for example, the fixed wall portion 8 and the impeller 1
The elastic ring member 13 absorbs all changes in the gap, such as a difference in thermal expansion of 0, a change in the gap due to swelling and abrasion, and a change in the gap due to misalignment of the rotating shaft 2 of the impeller 10 or variation in the fitting tolerance. The gap δ2 between the fixed wall portion 8 and the impeller 10 during operation of the pump 1 can be kept constant.

Since at least the connecting ring 15 of the ring member 13 has an elastic force, the outer ring 1
Even if foreign matter such as slurry is caught between the outer ring 3 and the fixed wall portion 8, the foreign matter relatively easily passes between the outer peripheral ring portion 16 and the fixed wall portion 8 due to the elastic deformation of the connection ring portion 15. Wear (damage) of the fixed wall portion 8 and the like due to biting can be reduced. From these facts, a sufficient and stable sealing effect can be obtained in the sliding joints 11 between the respective pump steps 7 of the pump 1, and the leakage loss of the handling liquid can be reduced. A greater effect can be expected when applied to the multi-stage pump 1 having a large number of

The outer ring portion 16 of the ring member 13
Is between the stationary wall 8 and the pump 1 at rest.
Since the relatively large gap δ1 that can surely prevent the contact is formed, it is possible to prevent the wear due to the solid lubrication at the time of starting the pump 1, and to reduce the starting torque, and to secure the starting torque. Therefore, there is no need to increase the motor output or change the motor design.

Since the ring member 13 is made of an elastic material, the ring member 13 can be fitted and fixed to the impeller mouth ring 10b of the impeller 10 by utilizing the self-tightening action of the fitting ring portion 14. As a result, the work of assembling the pump 1 is facilitated, and the work of replacing the ring member 13 is also simplified, so that the maintenance work can be easily performed. Further, the ring member 13 is connected to the impeller 1.
0, the leakage loss reduction mechanism is configured, so even after the pump 1 is manufactured, it can be installed without additional processing depending on simple additional processing or the structure of the pump 1, and can be attached to the existing pump 1. Can also be easily handled.

The material of the ring member 13 of the first embodiment is not limited to the above-mentioned material, but may be formed of a metal material that can be deformed in an elastic region. Use a material with good slip characteristics (small coefficient of friction) or use an outer ring 16
By coating a substance such as PTFE on
Wear of the outer peripheral ring portion 16 can be further prevented.

The fitting ring portion 14 of the ring member 13 does not necessarily have to have elasticity, and is formed of, for example, a metal plate having no elasticity.
A connecting ring portion 15 having an elastic force and an outer peripheral ring portion 16 integrally formed at the tip portion is fixed to an outer surface of the impeller 10 by appropriate means, and the fitting ring portion 14 is shrunk and bonded to the impeller mouth ring 10b of the impeller 10. Alternatively, it is fixed by fixing means such as fitting of the front and rear surfaces. Even with this configuration, workability such as attachment and maintenance of the ring member 13 is inferior to that of the first embodiment, but the gap δ2 is deformed by the centrifugal force of the connecting ring portion 15 having elasticity. Can be kept constant.

Further, in the first embodiment, the gap δ2 during the operation of the pump 1 is set to be 0 mm, and the outer surface 16a of the outer peripheral ring portion 16 of the ring member 13 is brought into light contact with the fixed wall portion 8. It is good also as a structure sealed by.

FIG. 5 is a sectional view of a main part of a ring member of a second embodiment of the leakage loss reducing mechanism according to the present invention.
The feature of the second embodiment is that a plurality of ring members 13 are provided in the axial direction of the fitting ring portion 14 so that the leakage loss reduction mechanism is multistage. According to the second embodiment, the same operation and effect as those of the first embodiment can be obtained, and the sealability can be further ensured by multi-stage. In the second embodiment, as shown by a two-dot chain line in FIG. 5, a plurality of ring members 13 may be formed in different shapes.

FIGS. 6 to 10 show third to fifth embodiments of the leakage loss reducing mechanism according to the present invention. The basic feature of the configuration of each of these embodiments is that a substantially bag-shaped ring member having elasticity is used, and a space formed inside the bag-shaped ring member is outwardly moved by centrifugal force. The point is that a moving body that moves and deforms the bag-shaped ring member is housed. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, FIGS. 6 and 7 show a ring member according to a third embodiment of the leakage loss reducing mechanism according to the present invention.
6A is a cross-sectional view of a main part when the pump is stationary, FIG. 6B is a cross-sectional view of a main part when the pump is operating, and FIG. 7 is a partially broken plan view showing the entire ring member. The bag-like ring member 20 according to the third embodiment includes a pair of elastic sheet-like rings 21 and 22 and, for example, sand contained in a space 23 formed by the sheet-like rings 21 and 22. Metal particles,
It is formed of particles 24 as moving bodies such as resin particles. In some cases, a magnetic material can be used as the particles 24.

The ring member 20 accommodates a predetermined amount of the granular material 24 in the space 23 and forms the sheet-like rings 21, 22.
By adhering the mating portions, the portion of the sheet-like ring 21 in which the particles 24 are stored protrudes outward by a predetermined dimension to form the outer peripheral ring portion 25. The bag-shaped ring member 20 is fitted and fixed to the impeller mouth ring 10b of the impeller 10 by using the elastic force of the sheet-shaped ring 21. When the pump 1 is stationary, the outer ring portion 25 is formed.
A predetermined gap δ1 is set between the and the fixed wall portion 8.

When the pump 1 is operating, the centrifugal force acts on the granules 24 by the rotation of the ring member 20 due to the rotation of the impeller 10, and as shown in FIG. Is moved outward, and the outer peripheral ring portion 25 of the sheet-like ring 21 having elastic force is deformed so as to expand (extend) outward. Thereby, the gap δ2 is set between the outer surface 25a of the outer peripheral ring portion 25 and the fixed wall portion 8, and the same operation and effect as in the first embodiment can be obtained.

FIGS. 8 and 9 show a ring member according to a fourth embodiment of the leakage loss reducing mechanism according to the present invention.
9 is a sectional view of a main part thereof, and FIG. 9 is a sectional view taken along the line BB of FIG. The ring member 27 of the fourth embodiment includes a sheet-like ring 28 having elasticity and this sheet-like ring 2.
For example, it is formed of a sphere 29 as a moving body composed of a metal sphere, a resin sphere, or the like, which is accommodated in the space 23 of FIG. The ring member 27 has a plurality of spheres 29 integrally accommodated in a sheet-like ring 28 by insert molding or the like in a substantially connected state, thereby forming an outer peripheral ring portion 30 protruding outward by a predetermined dimension.

FIGS. 10 and 11 show a ring member according to a fifth embodiment of the leakage loss reducing mechanism according to the present invention.
FIG. 10 is a sectional view similar to FIG. 9, and FIG. 11 is a perspective view of an arc-shaped bar. The ring member 32 of the fifth embodiment is similar to the fourth embodiment.
Instead of the spherical body 29 in the embodiment, a plurality of arc-shaped bars 33 made of metal, resin, or the like and having a circular cross section and having an arc shape in plan view are accommodated in the space portion 23 of the sheet-like ring 28, and the arc-shaped bar 33 Outer ring portion 30
Is formed.

The arc-shaped bar 33 of the fifth embodiment is not limited to the arc-shaped bar 33 having a circular cross-section as shown in FIG. 11, but may be, for example, an arc-shaped bar 33 having a square cross-section as shown in FIG. An arc-shaped bar 3 having an appropriately-shaped cross section, such as an arc-shaped bar having a triangular cross-section shown in FIG. 12B or an arc-shaped bar 33 having a polygonal cross-section shown in FIG.
3 can be used, and its length L (see FIG. 11) can also be set appropriately.

In the fourth and fifth embodiments as well, the centrifugal force caused by the rotation of the ring members 27 and 32 causes the sphere 2
9 and the arc-shaped bar 33, which move outward in the space 23, and the sheet-like ring 28 expands (extends) outward to obtain the same operation and effect as the ring member 21 of the third embodiment. Can be.

FIGS. 13 (a) to 13 (f) are cross-sectional views of main parts of the ring member of the sixth to eleventh embodiments of the leakage loss reducing mechanism according to the present invention (however, cross-sectional views as viewed from the opposite direction to FIG. 3). ). The ring member 3 of the sixth embodiment shown in FIG.
Reference numeral 5 denotes a combination of the ring member 13 shown in the first embodiment and, for example, the ring member 21 shown in the third embodiment. The first outer ring portion is connected to the fitting ring portion 14 via the connection ring portion 15. 16 and the space 2
Particles 24 (or spherical body 29, arc-shaped bar 33) in 3
To form a second outer peripheral ring portion 30. According to the sixth embodiment, as in the second embodiment, the number of stages of the leakage loss reduction mechanism can be increased.

The ring member 36 of the seventh embodiment shown in FIG. 13 (b) is formed on the fitting ring portion 14 via the connecting ring portion 15 on the outer ring portion 16 and has metal and resin in the outer ring portion 16. And the like, and a weight 37 having a predetermined weight. According to the seventh embodiment, since the outer peripheral ring portion 16 is heavier by the weight 37, the pump 1
The centrifugal force can be effectively applied to the outer peripheral ring portion 16 during the operation.

In the ring member 38 of the eighth embodiment shown in FIG. 13C, a C-shaped connecting ring portion 39 is formed integrally with the fitting ring portion 14, and a distal end portion 39a of the connecting ring portion 39 is formed. This is to function as an outer ring portion.

The ring member 40 of the ninth embodiment shown in FIG. 13D has an outer ring portion 41 having a substantially key-shaped cross section formed on the fitting ring portion 14 via the connecting ring portion 15. . According to the ring member 40, the pump 1
When the pump 1 is in a stationary state, the outer peripheral ring portion 41 maintains a predetermined shape, and when the pump 1 is in an operating state, the impeller 1
The outer peripheral ring portion 41 is deformed outward due to centrifugal force caused by the rotation of 0, and the liquid handled in the pump 1 enters the inside of the key-shaped outer peripheral ring portion 41 as shown by the arrow B, thereby making the outer peripheral ring portion 41 more effective outside. Can be deformed.

The ring member 42 of the tenth embodiment shown in FIG. 13 (e) has a tip ring portion 43 having a substantially circular cross section at the tip of the outer ring portion 41 having a substantially key-shaped cross section of the ring member 41 of the ninth embodiment. Is formed. Also in this ring member 42, the pressure of the handling liquid acts on the outer peripheral ring portion 41 when the pump 1 is operated, similarly to the ring member 41 of the ninth embodiment, and as shown by the two-dot chain line, the outer peripheral ring portion 41 In addition, at the time of this deformation, the backflow of the handling liquid that has entered the outer peripheral ring portion 41 is suppressed by the distal end ring portion 43, and the pressure of the handling liquid acts more on the outer peripheral ring portion 41.

The ring member 44 of the eleventh embodiment shown in FIG.
5 are integrally formed, and the tip end portion 45a of the bellows-like ring portion 45 functions as an outer peripheral ring portion. In the ring member 44, the outer peripheral ring portion 16 and the like having a substantially arc-shaped cross section can be formed at the tip end portion 45a of the bellows-like ring portion 45.

The sixth to the first shown in FIGS.
Also in the first embodiment, since the fitting ring portion 14 of each ring member is fitted and fixed to the impeller mouth ring 10b of the impeller 10, the ring member can be deformed by centrifugal force due to rotation of the impeller 10, so that each ring member can be deformed. The gap δ2 can be maintained between the outer peripheral ring portion or the distal end portion and the fixed wall portion 8, and the same operation and effect as those of the ring members of the respective embodiments can be obtained.

FIGS. 14 to 18 show the twelfth to fourteenth embodiments of the leakage loss reducing mechanism according to the present invention. The features of each of the embodiments are that the outer peripheral ring portion of the ring member is deformed outwardly. (Elongation) is limited by a limiting member. That is, a plurality of ring members 61 of the twelfth embodiment shown in FIGS. 14 and 15 are provided between the outer peripheral ring portion 16 and the fitting ring portion 14 and at equal intervals in the circumferential direction of the fitting ring portion 14. (Eight in the figure) springs 62 are provided.

When a centrifugal force acts on the ring member 61 by the spring 62, the extension of the outer peripheral ring portion 16 in the direction of arrow D is limited.
6 is prevented from contacting the partition fixing wall 8 with a strong contact pressure. As a result, a predetermined gap can be maintained between the outer peripheral ring portion 16 of the ring member 61 and the partition fixing wall portion 8 or the contact can be made with a weak predetermined contact pressure, and the sealing effect can be further improved and Can be stabilized.

The ring member 6 of the thirteenth embodiment shown in FIG.
Reference numeral 3 denotes a modification of the ring member 61 of the twelfth embodiment.
4 is used. In the ring member 63 of the thirteenth embodiment, the same operation and effect as those of the ring member 61 of the twelfth embodiment can be obtained.

In the ring member 65 of the fourteenth embodiment shown in FIGS. 17 and 18, a ring-shaped spring 66 continuous in the circumferential direction is embedded in the outer peripheral ring portion 16. According to the ring member 65 of the fourteenth embodiment,
The extension of the ring member 65 in the direction indicated by the arrow D due to the centrifugal force is restricted by the ring-shaped spring 66, and the same operation and effect as the ring member 61 of the twelfth embodiment can be obtained. This 14th
Also in the embodiment, the string 64 having elasticity can be used instead of the spring 66, and an appropriate member having predetermined elasticity can be used without being limited to the spring or the string.

The leakage loss reducing mechanism according to the present invention is not limited to each of the above-described first to fourteenth embodiments, and these embodiments can be appropriately combined with each other. The shape, material and the like can be appropriately changed.

In the above embodiment, the leakage loss reducing mechanism is applied between the fixed wall portion 8 of the multi-stage pump 1 and the impeller mouth ring 10b. However, the present invention is not limited to this. The present invention can also be applied between the outer periphery and the corresponding fixed wall portion 8 or the like. Furthermore, the application site of the present invention is not limited to the joint between the pump step portions 7 of the multi-stage pump 1, but may be, for example, the rotating shaft of the shaft sealing device 5 portion of FIG. 14 or the shaft sealing device portion of a single-stage pump (not shown). Alternatively, the ring members may be fixed to form a leakage loss reduction mechanism.

According to the structure in which the ring member is provided in the shaft sealing device portion, the shaft sealing device portion can be sealed by the deformation of the ring member due to the rotation of the rotating shaft. The effect can be assisted, and leakage of the handled liquid to the outside (outside of the pump) can be more reliably prevented. As described above, the leakage loss reduction mechanism according to the present invention can be applied to various parts of various pumps having a casing as a fixed object, an impeller as a rotating object, a rotating shaft, and the like.

[0059]

As described above in detail, according to the first aspect of the present invention, during operation of the pump, centrifugal force acts on the ring member due to rotation of the rotating member so that the ring member extends in the direction of the fixed member. Due to the deformation, the gap between the outer peripheral portion of the ring member and the fixed object can be maintained at a predetermined gap. For example, a liquid film interposed in this gap can provide a sufficient and stable sealing effect between the rotating object and the fixed object. As a result, the leakage loss of the handling liquid can be reduced. In addition, the ring member is not deformed outward due to centrifugal force and does not contact the fixed object at least when the pump is at rest when the rotating object does not rotate. Wear can be prevented.

According to the second aspect of the present invention, the ring member is fixed by fitting the fitting ring portion to a rotating object, and the connecting ring portion provided on the fitting ring portion so as to protrude outward is provided. Since the rotating member is deformed so as to extend outward by centrifugal force due to the rotation of the rotating member, a sufficient and stable sealing effect is obtained between the rotating member and the fixed member by the outer peripheral ring portion of the deformed ring member, and leakage of the handling liquid is obtained. Loss can be reduced.

According to the third aspect of the invention, when the bag-shaped ring member fixed to the rotating object rotates integrally with the rotating object, the centrifugal force is stored in the bag-shaped ring member. Acting on the moving body, the moving body moves outward in the ring member, and the outer peripheral portion of the ring member is deformed so as to extend outward, so that the outer peripheral portion is sufficient and stable between the rotating object and the fixed object. The sealing effect described above is obtained, and the leakage loss of the handling liquid can be reduced.

According to the fourth aspect of the invention, each sliding joint of the multi-stage pump is sealed by deformation due to centrifugal force of a ring member fixed to a rotating boss such as an impeller mouth ring of an impeller. Therefore, a sufficient and stable sealing effect is obtained between the impeller and the partition fixing wall portion, the leakage loss between the pump step portions of the handling liquid can be reduced, and the ring member is provided on the rotating boss portion of the impeller.
It can be fixed simply by fitting it in, and assembling and maintenance work of the multi-stage pump can be easily performed.

According to the fifth aspect of the present invention, in the case of a single-stage pump or a multi-stage pump having a shaft sealing device at a shaft penetrating portion in which the rotating shaft penetrates the fixed object, the rotating shaft rotates. The ring member fixed to the rotating shaft is deformed by the centrifugal force, and the deformation of the ring member seals between the rotating shaft and the fixed object of the shaft sealing device portion, thereby assisting the sealing effect of the shaft sealing device. In addition, it is possible to reliably prevent the handling liquid from leaking from the shaft sealing device to the outside, and to obtain a sufficient and stable sealing effect on the shaft sealing device.

According to the sixth aspect of the invention, when a centrifugal force acts on the ring member due to the rotation of the rotating object, the ring member attempts to deform in the direction of the fixed object. This deformation is provided on the ring member. For example, strong contact with the fixed object is prevented, the deformation of the ring member becomes more appropriate, and the sealing effect between the rotating object and the fixed object can be more stable and improved, for example. Has the effect of

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing a first embodiment of a leakage loss reducing mechanism for a pump according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the same.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is an explanatory diagram of the operation.

FIG. 5 is a sectional view of a principal part of a ring member showing a second embodiment of the leakage loss reducing mechanism.

FIG. 6 is a sectional view of a principal part of a ring member showing a third embodiment of the leakage loss reducing mechanism;

FIG. 7 is a partially broken plan view showing the entirety of the ring member.

FIG. 8 is a sectional view of a main part of a ring member showing a fourth embodiment of the leakage loss reducing mechanism.

FIG. 9 is a sectional view taken along the line BB of FIG. 8 with the same parts omitted.

FIG. 9 shows a fifth embodiment of the leakage loss reduction mechanism.
Cross section similar to

FIG. 11 is a perspective view of the arc-shaped bar.

FIG. 12 is a perspective view showing another embodiment of the arc bar.

FIG. 13 is a sectional view of a principal part of a ring member showing sixth to eleventh embodiments of the leakage loss reduction mechanism.

FIG. 14 is a sectional view of a ring member showing a twelfth embodiment of the leakage loss reducing mechanism.

FIG. 15 is a view taken on line CC of the same.

FIG. 16 is a sectional view of a ring member showing a thirteenth embodiment of the leakage loss reduction mechanism.

FIG. 17 is a sectional view of a ring member showing a fourteenth embodiment of the leakage loss reducing mechanism;

FIG. 18 is a view taken on line DD of the same.

FIG. 19 is a sectional view showing an example of a multi-stage pump.

FIG. 20 is a sectional view of a main part showing a conventional leakage loss reduction mechanism.

FIG. 21 is a cross-sectional view of a main part showing another conventional leakage loss reduction mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Multistage pump 2 Rotary shaft 3 Multistage pump part 4 Balance disk part 5 Shaft sealing device 6 Bearing part 7 Pump step part 8 Partition fixed wall part 9 Fixed joint part 10 Impeller 10a Rotating boss part 10b Impeller mouth ring 11 Sliding joint part 13 , 20, 27, 32, 35, 36, 38, 40, 4
2, 44, 61, 63, 65 Ring member 14 Fitting ring part 15, 39 Connecting ring part 16, 25, 30, 41 Outer ring part 16a, 25a Outer surface 17 Liquid film 24 Granule 29 Sphere 33 Arc-shaped bar 37 Weight 39a, 45a Tip 45 Bellows ring 62 Spring 64 String 66 Spring

Claims (6)

[Claims] A mechanism for reducing leakage loss of a handling liquid by sealing between a rotating member and a fixed member of a pump, wherein a ring member is fixed to a surface of the rotating member facing the fixed member. Wherein the rotary member is deformed by centrifugal force caused by the rotation of the rotary member, and the deformed ring member seals between the rotary member and the fixed member. 2. An outer peripheral ring provided in a state in which said ring member is fitted in and fixed to a rotating member of a pump, and an outwardly projecting via an elastic connecting ring portion in said fitted ring portion. The pump leakage according to claim 1, wherein the ring member seals between the rotating member and the fixed member by deforming at least the connecting ring portion by centrifugal force generated by rotation of the rotating member. Loss reduction mechanism. 3. The ring member is formed of a bag-shaped ring member having elasticity and a moving body accommodated in the ring member, and the moving body moves outward by centrifugal force caused by rotation of a rotating object. 2. The leakage loss reduction mechanism for a pump according to claim 1, wherein the ring member is deformed by this, and the outer periphery of the deformed ring member seals between the rotating object and the fixed object. 4. The pump according to claim 1, wherein a fixed joint formed by an engagement hole between the partition fixing walls of each of the pump steps and a rotary boss between the partition fixing wall and a rotating boss of the impeller. 2. A multi-stage pump sequentially joined via a sliding joint formed from a passage, wherein the ring member is fixed to a rotating boss portion of the impeller.
4. The leakage loss reduction mechanism for a pump according to any one of claims 3 to 3. 5. A mechanism for reducing a leakage loss of a handling liquid from a shaft sealing device portion of a pump having a shaft sealing device in a shaft penetrating portion through which a rotating shaft penetrates a fixed object, wherein the shaft sealing device for the rotating shaft is provided. A ring member is fixed to the portion, the ring member is deformed by centrifugal force generated by rotation of the rotating shaft, and the shaft sealing device is sealed by the deformed ring member. 6. A pump according to claim 1, wherein said ring member is provided with a restricting member for restricting deformation in a direction toward a fixed object due to centrifugal force. mechanism.