KR20180094956A - Fluid coupling - Google Patents

Fluid coupling Download PDF

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Publication number
KR20180094956A
KR20180094956A KR1020187019395A KR20187019395A KR20180094956A KR 20180094956 A KR20180094956 A KR 20180094956A KR 1020187019395 A KR1020187019395 A KR 1020187019395A KR 20187019395 A KR20187019395 A KR 20187019395A KR 20180094956 A KR20180094956 A KR 20180094956A
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KR
South Korea
Prior art keywords
working fluid
fluid
air
impeller
liquid separator
Prior art date
Application number
KR1020187019395A
Other languages
Korean (ko)
Inventor
히로시 오가타
요시노리 가타야
히데토시 가사이
하야토 이케다
Original Assignee
가부시키가이샤 에바라 세이사꾸쇼
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Publication of KR20180094956A publication Critical patent/KR20180094956A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • B04C5/04—Tangential inlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D33/00—Rotary fluid couplings or clutches of the hydrokinetic type
    • F16D33/18—Details

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cyclones (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

The present invention relates to a gas-liquid separator for separating air mixed with a working fluid of a fluid coupling from a corresponding working fluid. The fluid coupling comprises an impeller 1 and a runner 2 disposed opposite to each other and a scoop tube 2 for increasing or decreasing the amount of working fluid in the fluid chamber 5 formed between the impeller 1 and the runner 2. [ A working fluid circulating line 27 extending from the scoop tube 30 to the fluid chamber 5 and connected to the working fluid circulating line 27 and connected to the scoop tube 30 And a gas-liquid separator 28 for separating the air from the working fluid. The gas-liquid separator 28 is a cyclone type gas-liquid separator for separating air from the working fluid by turning a mixed fluid of the working fluid and the air.

Description

Fluid coupling

The present invention relates to a fluid coupling, and more particularly to a gas-liquid separating apparatus for separating air mixed with a working fluid of a fluid coupling from a corresponding working fluid.

The fluid coupling is a device for transmitting the rotation of the input shaft to the output shaft through a working fluid existing between the impeller which is the input side impeller and the runner which is the output side impeller. For the working fluid, for example, hydraulic fluid is used. The rotational speed of the output shaft relative to the input shaft can be steplessly changed by increasing or decreasing the amount of working fluid existing between the impeller and the runner.

The impeller and the runner are arranged facing each other, and a fluid chamber is formed between the impeller and the runner. The working fluid in the fluid chamber flows by the rotating impeller, and the flowing working fluid rotates the runner. The amount of working fluid in the fluid chamber is increased or decreased by the scoop tube. The working fluid pumped by the scoop tube is again supplied to the fluid chamber through the working fluid circulation line.

Japanese Unexamined Patent Application Publication No. 10-196686

The working fluid flowing in the fluid chamber is agitated with the air in the fluid chamber, so that a mixed fluid of the air and the working fluid is formed. Thus, the scoop tube purges the mixed fluid of air and working fluid. Even when the scoop tube blows the mixed fluid, air in the fluid chamber flows into the scoop tube together with the mixed fluid. The mixed fluid of the working fluid and the air introduced into the scoop tube is supplied to the fluid chamber again through the working fluid circulation line. The air in the mixed fluid supplied from the working fluid circulation line to the fluid chamber pulsates the pressure of the working fluid that is transmitting the rotation of the impeller to the runner, and as a result, the rotational speed of the output shaft connected to the runner fluctuates.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluid coupling having a gas-liquid separator capable of separating air from a working fluid with a simple structure.

According to an aspect of the present invention, there is provided a scroll fluid machine including an impeller and a runner disposed opposite to each other, a scoop tube for increasing and decreasing an amount of working fluid in a fluid chamber formed between the impeller and the runner, And a gas-liquid separator connected to the working fluid circulating line, for separating the working fluid from the working fluid, the working fluid circulating line extending from the scoop tube to the fluid chamber, Wherein the gas-liquid separator is a cyclone type gas-liquid separator for separating the air from the working fluid by orbiting a mixed fluid of the working fluid and the air.

In a preferred embodiment of the present invention, the cyclone type gas-liquid separator includes a cyclone housing into which the mixed fluid flows, and the mixed fluid is introduced into the cyclone housing by the pressure of the working fluid raised by the rotation of the impeller .

In a preferred embodiment of the present invention, the cyclone housing is connected to an air discharge pipe for discharging air separated from the working fluid in a horizontal direction.

In a preferred embodiment of the present invention, the cyclone gas-liquid separator is horizontally disposed.

According to the present invention, the mixed fluid of the working fluid and the air flowing through the working fluid circulating line is circulated by the cyclone gas-liquid separating device. Since the specific gravity of the air is lighter than the specific gravity of the working fluid, air can be separated from the working fluid by the difference between the centrifugal force acting on the air and the centrifugal force acting on the working fluid. Therefore, the air can be separated from the working fluid with a simple structure only by connecting the cyclone type gas-liquid separator to the working fluid circulating line extending from the scoop tube to the fluid chamber.

1 is a plan view schematically showing an embodiment of a fluid coupling of the present invention.
Fig. 2 is a side view schematically showing a part of the fluid coupling shown in Fig. 1. Fig.
3 is a schematic sectional view of the cyclone type gas-liquid separator shown in Fig.
4 is a sectional view taken along the line AA in Fig.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a plan view schematically showing an embodiment of a fluid coupling of the present invention. 1, the fluid coupling includes an impeller 1 and a runner 2 opposed to each other, a drive shaft 11 to which the impeller 1 is fixed, an output shaft 11 to which the runner 2 is fixed 12). The impeller 1 is also called an input side impeller, and the runner 2 is also called an output side impeller. The impeller 1 and the runner 2 each have a hemispherical shape having a plurality of radial blades on the inner side and a fluid chamber 5 is formed between the impeller 1 and the runner 2.

And the input shaft 15 is disposed in parallel with the drive shaft 11. The input shaft 15 is supported by radial bearings 16, A large gear 21 is fixed to the input shaft 15 and a small gear 22 meshing with the large gear 21 is fixed to the drive shaft 11. The end of the input shaft 15 is connected to a prime mover (not shown) such as a motor or a gas turbine. The rotation of the prime mover is transmitted from the input shaft 15 to the drive shaft 11 via the large gear 21 and the small gear 22.

The fluid coupling includes an operating fluid circulating system 25 for supplying a working fluid to a fluid chamber 5 formed between the impeller 1 and the runner 2, (Scoop up tube) 30 for letting the scoop tube (scoop up tube) The tip (30a) of the scoop tube (30) is located in the impeller casing (7). The impeller casing 7 is fixed to the impeller 1 and has a shape surrounding the runner 2. The impeller casing (7) rotates together with the impeller (1).

An actuator 31 such as an oil pressure servo is connected to the scoop tube 30. The scoop tube 30 is movable in the radial direction of the impeller 1 and the runner 2 by the actuator 31 . When the impeller 1 and the impeller casing 7 are rotating, the working fluid (e.g., hydraulic oil) is held by the rotating impeller casing 7. The working fluid in the impeller casing (7) flows by the rotating impeller (1), and the flowing working fluid rotates the runner (2).

When the impeller 1 is rotating, a centrifugal force is generated in the working fluid, and the pressure of the working fluid is increased. The tip 30a of the scoop tube 30 purges the working fluid in the impeller casing 7 and the working fluid is discharged from the impeller casing 7 through the scoop tube 30. The working fluid circulating system 25 has a fluid cooling device 26 for cooling the working fluid and a working fluid circulating line 27 extending through the fluid cooling device 26. [ The inlet of the working fluid circulating line 27 is connected to the scoop tube 30 and the outlet of the working fluid circulating line 27 communicates with the fluid chamber 5 between the impeller 1 and the runner 2 . That is, the working fluid circulation line 27 extends from the scoop tube 30 to the fluid chamber 5. Further, the working fluid circulating system 25 has a gas-liquid separating device 28 connected to the working fluid circulating line 27. The gas-liquid separator 28 will be described later.

The working fluid discharged from the impeller casing 7 through the scoop tube 30 flows through the working fluid circulating line 27 and is sent to the fluid cooling device 26. [ The working fluid is cooled by heat exchange with the cooling water, and then returned to the fluid chamber 5 through the working fluid circulating line 27 again. As such, the working fluid circulates between the fluid chamber 5 and the fluid cooling device 26 by its own pressure raised by the rotating impeller 1.

The impeller 1 is fixed to the drive shaft 11 and the runner 2 is fixed to the output shaft 12. The rotation of the drive shaft 11 is transmitted from the impeller 1 to the runner 2 via the working fluid, and the output shaft 12 rotates. The rotational speed of the runner 2 is changed according to the amount of the working fluid in the fluid chamber 5 formed between the impeller 1 and the runner 2. [ Specifically, the greater the amount of working fluid, the higher the rotational speed of the runner 2.

The amount of working fluid in the fluid chamber (5) varies depending on the position of the scoop tube (30). That is, when the distal end 30a of the scoop tube 30 moves radially outward, the amount of the working fluid decreases and when the distal end 30a of the scoop tube 30 moves radially inward, . Thus, by operating the scoop tube 30 with the actuator 31, the amount of working fluid in the fluid chamber 5, that is, the rotational speed of the output shaft 12 can be changed.

When the centrifugal force is applied to the working fluid by the rotation of the impeller 1, the pressure of the working fluid rises and thrust force acts on the impeller 1 and the runner 2. [ Therefore, the drive shaft 11 is rotatably supported by the two radial bearings 40, 41 and the one thrust bearing 42. Likewise, the output shaft 12 is also rotatably supported by two radial bearings 45 and 46 and one thrust bearing 47.

The fluid coupling has a lubricant supply system 50 for supplying lubricant to the radial bearings 16, 17, 40, 41, 45, 46 and the thrust bearings 42, 47. The lubricating oil supply system 50 includes an oil cooling device 54 for cooling the lubricating oil, a lubricating oil supply line 51 extending through the oil cooling device 54, And a pump 53 are provided. In the present embodiment, the oil pump 53 is a gear pump connected to the input shaft 15 and operated in accordance with the rotation of the input shaft 15. In one embodiment, the oil pump 53 may be a pump driven independently of the input shaft 15 by an electric motor. The lubricating oil is conveyed by the oil pump 53 to the oil cooling apparatus 54 through the lubricating oil supply line 51, where it is cooled by the cooling water. The cooled lubricant is again supplied to the radial bearings 40, 41, 45, 46 and the thrust bearings 42, 47 through the lubricant supply line 51. The cooled lubricating oil is also supplied to the radial bearings 16 and 17 that support the input shaft 15. [

The working fluid in the fluid chamber 5 flows by the rotating impeller 1 and the working fluid rotates the runner 2. [ The working fluid flowing in the fluid chamber 5 is stirred with the air in the fluid chamber 5, so that a mixed fluid of the air and the working fluid is formed. Thus, the scoop tube 30 purges the mixed fluid of air and working fluid. Air in the fluid chamber 5 flows into the scoop tube 30 together with the mixed fluid even when the scoop tube 30 sprays a mixed fluid of air and a working fluid. The mixed fluid introduced into the scoop tube 30 is supplied to the fluid chamber 5 through the working fluid circulation line 27 again. The air in the mixed fluid supplied from the working fluid circulating line 27 to the fluid chamber 5 pulsates the pressure of the working fluid which is transmitting the rotation of the impeller 1 to the runner 2, The rotational speed of the output shaft 12 connected to the output shaft 12 varies.

Thus, the fluid coupling of the present embodiment is provided with the gas-liquid separator 28 for separating the air from the working fluid. The gas-liquid separator 28 is connected to a working fluid circulating line 27 extending from the scoop tube 30 to the fluid chamber 5. The gas-liquid separator 28 is a device for separating the mixed fluid into the air and the working fluid. The gas-liquid separator 28 of this embodiment rotates the mixed fluid of the working fluid and the air, thereby separating the air from the working fluid And is a cyclone gas-liquid separation device. In the following description, the gas-liquid separator 28 is referred to as a cyclone type gas-liquid separator 28.

Fig. 2 is a side view schematically showing a part of the fluid coupling shown in Fig. 1. Fig. 2, the housing main body 3 has a casing 8 for accommodating the impeller 1 and the runner 2, and an oil tank 9 connected to the lower portion of the casing 8 have. In the present embodiment, working fluid is used, and oil tank 9 is filled with working fluid for replenishment in the working fluid circulation line 27. The working oil stored in the oil tank 9 is also used as the above-mentioned lubricating oil. The lower end of the casing 8 is open, and the upper end of the oil tank 9 is also open. Therefore, the inner space of the casing 8 is in communication with the inner space of the oil tank 9. The oil level meter 10 is fixed to the casing 8 and the worker can confirm the amount of oil stored in the oil tank 9 and the casing 8 through the oil level meter 10.

As shown in FIG. 2, the cyclone type gas-liquid separator 28 is disposed below the impeller 1 and the runner 2 in the housing main body 3. The working fluid circulating line 27 is connected to the primary cooling circulation line 27a extending from the scoop tube 30 and connected to the cyclone type gas-liquid separating device 28, And a secondary side circulation line 27b extending to the fluid chamber 5 via a fluid passage 26 (see Fig. 1).

The air introduced into the scoop tube 30 together with the working fluid flows into the cyclone type gas-liquid separator 28 through the primary side circulation line 27a and is separated from the working fluid by the cyclone type gas-liquid separator 28 . Therefore, a mixed fluid of the working fluid and the air flows in the primary circulation line 27a, and only the working fluid flows in the secondary circulation line 27b.

3 is a schematic cross-sectional view of the cyclone type gas-liquid separator 28 shown in Fig. 4 is a sectional view taken along the line A-A in Fig. 3 and 4, the cyclone type gas-liquid separator 28 has a cyclone housing 35 into which a mixed fluid of working fluid and air is introduced. The cyclone housing 35 has a cylindrical portion 35a and a conical portion 35b connected to the cylindrical portion 35a. The central axis of the cylindrical portion 35a coincides with the central axis of the conical portion 35b. A disc cover 36 is fixed to an end of the cylindrical portion 35a. An air discharge pipe (38) communicating with the inner space of the cyclone housing (35) is fixed to the center of the lid (36). In addition, the distal end of the conical boss 35b is connected to the secondary circulation line 27b.

A housing inlet 35c through which the mixed fluid flows is formed in the cylindrical portion 35a. The cyclone type gas-liquid separator 28 has an inlet pipe 37 connected to the housing inlet 35c. The inlet tube 37 extends from the housing inlet 35c in the tangential direction of the cylindrical portion 35a. Further, the inlet pipe 37 is connected to the primary side circulation line 27a. A housing outlet 35d through which the working fluid from which air is separated flows out is formed at the tip of the conical boss 35b.

The mixed fluid of the working fluid and the air flows into the cyclone housing 35 from the housing inlet 35c through the primary side circulation line 27a and the inlet tube 37. [ As shown in Fig. 4, the mixed fluid of the working fluid and the air flows into the cyclone housing 35 from the tangential direction of the cylindrical portion 35a. Since the working fluid has a pressure raised by the rotation of the impeller 1, the mixed fluid of the working fluid and the air flows into the cyclone housing 35 at a high speed by its own pressure, and circulates in the cyclone housing 35 . Therefore, in the present embodiment, in order to rotate the mixed fluid in the cyclone housing 35, an additional facility such as a pump for raising the pressure of the working fluid is unnecessary.

A centrifugal force acts on the mixed fluid circulating in the cyclone housing 35. Since the specific gravity of the air is lighter than the specific gravity of the working fluid, air can be separated from the working fluid by the difference between the centrifugal force acting on the air and the centrifugal force acting on the working fluid. The air separated from the working fluid is discharged through the air discharge pipe 38 to the outside of the cyclone housing 35, that is, outside the working fluid circulating line 27. The air-separated working fluid flows through the housing outlet 35d into the secondary circulation line 27b and returns to the fluid chamber 5 via the fluid cooling device 26 (see Fig. 1).

As described above, according to the present embodiment, the air can be separated from the working fluid with a simple structure only by connecting the cyclone type gas-liquid separator 28 to the fluid circulation line 27. [

As shown in Fig. 2, the cyclone type gas-liquid separator 28 of this embodiment is arranged horizontally. More specifically, the cylindrical portion 35a and the conical portion 35b of the cyclone housing 35 of the cyclone type gas-liquid separator 28 are horizontally disposed. The cyclone type gas-liquid separator 28 is located below the scoop tube 30. The mixed fluid discharged from the scoop tube 30 flows into the cyclone housing 35 through the primary side circulation line 27a extending in the substantially vertical direction. In addition, the mixed fluid flows in the horizontal direction from the cylindrical portion 35a toward the conical portion 35b, while circulating in the cyclone housing 35. [ The separated working fluid flows in the horizontal direction as it is, and flows into the fluid cooling apparatus 26 through the secondary side circulation line 27b.

By disposing the cyclone type gas / liquid separator 28 horizontally in this way, it is not necessary to provide the curved portion for changing the flow direction of the fluid in the primary side circulation line 27a. Therefore, the primary side circulation line 27a is shortened . Therefore, a compact fluid coupling can be realized.

3, an air discharge pipe 38 for discharging the air separated from the working fluid from the cyclone housing 35 is connected to the inner space of the cyclone housing 35 fixed to the cover 36 A communicating portion 38a, a main pipe portion 38b extending upward from the communicating portion 38a and a horizontal portion 38c extending in the horizontal direction from the main pipe portion 38b. In this embodiment, the communicating portion 38a extends in the horizontal direction from the central portion of the lid 36, and the main pipe portion 38b extends in the vertical direction. An air outlet 38d is formed at the end of the horizontal portion 38b. The air separated from the working fluid is discharged horizontally from the air outlet 38d through the communication portion 38a, the main portion 38a and the horizontal portion 38b.

The air discharged from the air discharge pipe 38 includes mist of the working fluid (working oil in this embodiment). Therefore, the air is discharged from above the liquid level of the oil stored in the oil tank 9. When air collides with the liquid level of the oil stored in the oil tank 9, bubbles may be generated on the liquid level of the oil. As a result, there is a case where the accurate storage amount of the oil from the oil level meter 10 can not be confirmed by the bubbles.

According to the present embodiment, the air separated from the working fluid is discharged in a horizontal direction from the air discharge port 38c of the air discharge pipe 38. Therefore, air can prevent bubbles from being generated on the liquid level of the oil without imparting impact to the oil level.

The above-described embodiments are described for the purpose of enabling a person having ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments will be apparent to those skilled in the art, and the technical spirit of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the embodiments described, but is to be construed as broadest scope according to the technical idea defined by the claims.

The present invention is applicable to a gas-liquid separator for separating air mixed with a working fluid of a fluid coupling from a corresponding working fluid.

1: Impeller
2: Runner
3: Housing body
5: fluid chamber
7: Impeller casing
8: Casing
9: Oil tank
10: Oil level meter
11:
12: Output shaft
15: input shaft
16, 17: Radial bearing
21: Large gear
22: Small gear
25: Working fluid circulation system
26: Fluid cooling device
27: working fluid circulation line
28: Cyclone type gas-liquid separator
30: Scoop tube (lifting pipe)
31: Actuator
35: Cyclone housing
36: Cover
37: inlet pipe
38: air discharge pipe
40, 41, 45, 46: Radial bearings
42, 47: thrust bearing
50: Lubricant supply system
51: Lubricating oil supply line
53: Oil pump
54: Oil cooling device

Claims (4)

An impeller and a runner disposed facing each other,
A scoop tube for increasing or decreasing the amount of working fluid in the fluid chamber formed between the impeller and the runner,
A working fluid circulating line extending from the scoop tube to the fluid chamber,
And a gas-liquid separator connected to the working fluid circulating line for separating the working fluid and the air introduced into the scoop tube from the working fluid,
Wherein the gas-liquid separator is a cyclone type gas-liquid separator for separating the air from the working fluid by orbiting a mixed fluid of the working fluid and the air. The cyclone separator according to claim 1, wherein the cyclone separator comprises a cyclone housing into which the mixed fluid flows,
And the fluid is pivoted in the cyclone housing by the pressure of the working fluid raised by the rotation of the impeller. The fluid coupling according to claim 2, wherein the cyclone housing is connected to an air discharge pipe for horizontally discharging the air separated from the working fluid. The fluid coupling according to any one of claims 1 to 3, wherein the cyclone gas-liquid separator is horizontally disposed.
KR1020187019395A 2015-12-15 2016-10-19 Fluid coupling KR20180094956A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2015244503A JP2017110708A (en) 2015-12-15 2015-12-15 Hydraulic coupling
JPJP-P-2015-244503 2015-12-15
PCT/JP2016/080958 WO2017104252A1 (en) 2015-12-15 2016-10-19 Fluid coupling

Publications (1)

Publication Number Publication Date
KR20180094956A true KR20180094956A (en) 2018-08-24

Family

ID=59056053

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020187019395A KR20180094956A (en) 2015-12-15 2016-10-19 Fluid coupling

Country Status (3)

Country Link
JP (1) JP2017110708A (en)
KR (1) KR20180094956A (en)
WO (1) WO2017104252A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6250328U (en) * 1985-09-18 1987-03-28
JPH0518660U (en) * 1991-08-19 1993-03-09 三菱重工業株式会社 Separation device using centrifugal force
CN104023807A (en) * 2012-10-29 2014-09-03 株式会社Tnk Circulation system for separating and removing bubbles from liquid

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JP2017110708A (en) 2017-06-22
WO2017104252A1 (en) 2017-06-22

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