US2962863A - Device for degassing pressure fluids of hydraulic power plants - Google Patents

Device for degassing pressure fluids of hydraulic power plants Download PDF

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US2962863A
US2962863A US637193A US63719357A US2962863A US 2962863 A US2962863 A US 2962863A US 637193 A US637193 A US 637193A US 63719357 A US63719357 A US 63719357A US 2962863 A US2962863 A US 2962863A
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container
pump
pipe
liquid
hydraulic power
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US637193A
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Caroli Gerhard
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0042—Degasification of liquids modifying the liquid flow
    • B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
    • B01D19/0057—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet

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  • the invention relates to a device for degassing pressure fluids of hydraulic power plants. It is a well known fact that the entering of gases, such as air, into the ducts of a hydraulic power plant causes the formation of bubbles in and a rise in temperature of the pressure fluid. This in turn causes an irregular working of the pump delivering the pressure fluid and also a lowering of the eificiency of such a hydraulic power plant.
  • the invention aims to provide means for degassing or deaerating, as completely as possible, the pressure fluid in a hydraulic power plant including a pump and a hydraulic motor, and thereby to obtain a quiet and regular operation of the pressure pump on the one hand, and satisfactory efliciency of the pump due to a sufliciently high pressure on the suction-side, on the other hand.
  • the invention further aims to accomplish the desired result in a very simple manner in that it provides, in a hydraulic power plant, a pressure medium container into which a return pipe from the motor opens and from which a suction pipe to the pump extends.
  • the end of the return pipe is located below the level of the hydraulic fluid in the container and is formed nozzle-like at a small distance above the preferably funnel-shaped, flared entrance end of the suction pipe.
  • Fig. l is a diagrammatic illustration of the parts of a hydraulic power plant.
  • Fig. 2 is a vertical cross-section of the pressure medium container with the pipe-ends therein.
  • the power plant according to Fig. 1 comprises a pump 1 and a hydraulic motor 3 charged by the pump through the high pressure pipe or duct 2.
  • the hydraulic fluid which, in most instances, will be an oil, flows through a return pipe 4 to a fluid container 5 and from the latter through asuction pipe 6 back to the pump 1.
  • the return pipe 4 will be introduced into the container 5 vertically from above so as to extend downwards approximately half the height of the container in which the fluid level 8 is well above the discharge end 9 of the return pipe.
  • the entrance end portion of the suction pipe 6 is inserted through the bottom of the container 5 so that there is a short gap between the ends of the two pipes.
  • Both the return pipe and the suction pipe may be secured to the top and bottom, respectively, of the container by any suitable means, e.g. by welding or soldering, as indicated at 11 and 12. Means are provided to cause a drop of the velocity of the current of the hydraulic fluid leaving the pipe 4 before it enters the suction pipe 6.
  • the suction pipe 6 is provided with "a larger cross-section than the return pipe.
  • the end 9 of the pipe 4 will preferably be formed like a nozzle, and the ultimate end 10 of the suction pipe will preferably be funnel like flared.
  • the end 9 of the return pipe and the end It of the suction pipe are secured to each other and held in position by means of bridges or straps 7, 7' and 7".
  • the container 5 has a filling socket 13 with a cover 14 provided with a bore 15 through which the interior of the container permanently communicates with the atmosphere.
  • the hydraulic fluid such as an oil
  • the hydraulic fluid returning from the motor 3 will be shortly accelerated by the nozzle-shaped end of the return pipe with a subsequent velocity drop between the pipe 4 and the flared entrance of the suction pipe 6, which is wider than the return pipe.
  • the gas or air present in the hydraulic fluid will be expelled in the gap between the two tubes and simultaneously the pressure in the suction pipe 6 and thus in the pump will be favorably affected.
  • a degassing device in said suction line comprising a liquid container having means for maintaining a quantity of liquid therein, a first portion of said suction line returning from said fluid motor extending into said liquid container and terminating in a discharge opening of reduced dimension from said suction line extending below the liquid level in said liquid container, and a second portion of said suction line having an inlet opening of larger dimension than said discharge opening and in line with but spaced in an axial direction away from said discharge opening in the direction of discharge flow and located in said liquid, whereby liquid returning through said suction line to said pump is directed at high velocity from said first portion of said suction line into the liquid of said container and into said suction line second portion, the turbulence causing gases to be separated therefrom and to rise in said liquid container.
  • a liquid degassing device for positioning in a return line between a hydraulic motor and a hydraulic pump wherein liquid is forced from the motor to the pump, comprising, a liquid container, a suction return line for said pump including a first portion extending into said liquid container and terminating in a discharge opening of reduced dimension from said suction line extending below the liquid level in said liquid container, and a second portion of said suction line having an inlet opening of larger dimension than said discharge opening and in line 'With but spaced in an axial direction away from said discharge opening in the direction of discharge flow and located in said liquid, whereby liquid returning through 4.- said suction line to said pump is directed at high velocity from said first portion of said suction line into the liquid of said container and into said suction line second portion, the turbulence causing gases to be separated therefrom and to rise in said liquid container.
  • a liquid degassing device including vent means in said liquid container above the liquid level therein. 1 7

Description

Dec. 6, 1960 e. CAROL! 6 ,863
DEVICE FOR DEGASSING PRESSURE FLUIDS OF HYDRAULIC POWER PLANTS Filed Jan. 30, 1957 United States Patent? DEVICE FOR DEGASSING PRESSURE FLUIDS or HYDRAULIC rowan PLANTS Gerhard Caroli, Klopstockstr. 49, Stuttgart, Germany Filed Jan. 30, 1957, Ser. No. 637,193 (Ilaims priority, application Germany Feb. 1, 1 9 56 6 Claims. (Cl. 60-62) The invention relates to a device for degassing pressure fluids of hydraulic power plants. It is a well known fact that the entering of gases, such as air, into the ducts of a hydraulic power plant causes the formation of bubbles in and a rise in temperature of the pressure fluid. This in turn causes an irregular working of the pump delivering the pressure fluid and also a lowering of the eificiency of such a hydraulic power plant.
The removal, and particularly the complete removal of such quantities of gases, particularly of air present in the pressure fluids has met with great difficulties. Various methods and means have been proposed for this purpose. However, such methods and means have their considerable drawbacks as they either require additional mechanical means or more space than is available in many instances.
The invention aims to provide means for degassing or deaerating, as completely as possible, the pressure fluid in a hydraulic power plant including a pump and a hydraulic motor, and thereby to obtain a quiet and regular operation of the pressure pump on the one hand, and satisfactory efliciency of the pump due to a sufliciently high pressure on the suction-side, on the other hand.
The invention further aims to accomplish the desired result in a very simple manner in that it provides, in a hydraulic power plant, a pressure medium container into which a return pipe from the motor opens and from which a suction pipe to the pump extends.
it is another object of the invention to provide the return pipe from the motor to the pressure medium container with a smaller cross-section than the suction pipe from the pressure medium container to the pump.
According to a further object of the invention, the end of the return pipe is located below the level of the hydraulic fluid in the container and is formed nozzle-like at a small distance above the preferably funnel-shaped, flared entrance end of the suction pipe.
In this manner pressure conditions are created in the pressure medium circulation which favorably affect the output of the pressure pump. Simultaneously, the fluid pressure medium will be entirely deaerated within a few minutes owing to the velocity drop of the pressure medium in the rear of the nozzle-shaped, reduced end of the return pipe.
Further objects and details of the invention will be apparent from the description given hereinafter and the accompanying drawing illustrating an embodiment thereof by way of example. In the drawing,
Fig. l is a diagrammatic illustration of the parts of a hydraulic power plant, and
Fig. 2 is a vertical cross-section of the pressure medium container with the pipe-ends therein.
Referring now to the drawing, the power plant according to Fig. 1 comprises a pump 1 and a hydraulic motor 3 charged by the pump through the high pressure pipe or duct 2. From motor 3 the hydraulic fluid which, in most instances, will be an oil, flows through a return pipe 4 to a fluid container 5 and from the latter through asuction pipe 6 back to the pump 1. Preferably, the return pipe 4 will be introduced into the container 5 vertically from above so as to extend downwards approximately half the height of the container in which the fluid level 8 is well above the discharge end 9 of the return pipe. Opposite the return pipe 4, the entrance end portion of the suction pipe 6 is inserted through the bottom of the container 5 so that there is a short gap between the ends of the two pipes. Both the return pipe and the suction pipe may be secured to the top and bottom, respectively, of the container by any suitable means, e.g. by welding or soldering, as indicated at 11 and 12. Means are provided to cause a drop of the velocity of the current of the hydraulic fluid leaving the pipe 4 before it enters the suction pipe 6. For this purpose, the suction pipe 6 is provided with "a larger cross-section than the return pipe. Furthermore, the end 9 of the pipe 4 will preferably be formed like a nozzle, and the ultimate end 10 of the suction pipe will preferably be funnel like flared. The end 9 of the return pipe and the end It of the suction pipe are secured to each other and held in position by means of bridges or straps 7, 7' and 7". The container 5 has a filling socket 13 with a cover 14 provided with a bore 15 through which the interior of the container permanently communicates with the atmosphere.
In the structure so described, the hydraulic fluid, such as an oil, returning from the motor 3 will be shortly accelerated by the nozzle-shaped end of the return pipe with a subsequent velocity drop between the pipe 4 and the flared entrance of the suction pipe 6, which is wider than the return pipe. In consequence, the gas or air present in the hydraulic fluid will be expelled in the gap between the two tubes and simultaneously the pressure in the suction pipe 6 and thus in the pump will be favorably affected.
It will be apparent to those skilled in the art that many alterations and modifications of the structure shown and rhereinbefore described can be made without departure from the essence and spirit of my invention which for that reason shall not be limited but by the scope of the appended claims.
I claim:
1. In a hydraulic system including a fluid motor having an inlet and a discharge, pump means including a pres sure line arranged to discharge fluid through said motor inlet, and a suction line for said pump connected to said fluid motor discharge, the improvement comprising, a degassing device in said suction line, comprising a liquid container having means for maintaining a quantity of liquid therein, a first portion of said suction line returning from said fluid motor extending into said liquid container and terminating in a discharge opening of reduced dimension from said suction line extending below the liquid level in said liquid container, and a second portion of said suction line having an inlet opening of larger dimension than said discharge opening and in line with but spaced in an axial direction away from said discharge opening in the direction of discharge flow and located in said liquid, whereby liquid returning through said suction line to said pump is directed at high velocity from said first portion of said suction line into the liquid of said container and into said suction line second portion, the turbulence causing gases to be separated therefrom and to rise in said liquid container.
2. In a hydraulic system according to claim I, including bridging means, connecting said first and second portions of said suction line.
3. In a hydraulic system according to claim 1, wherein said first portion of said suction line is connected into the top of said container and extends substantially vertically downwardly therefrom, and said second portion is connected into the bottom of said container in vertical alignment with said first portion.
4. In a hydraulic system according to claim 1, wherein said second portion of said suction line inlet opening is flared outwardly.
5. A liquid degassing device for positioning in a return line between a hydraulic motor and a hydraulic pump wherein liquid is forced from the motor to the pump, comprising, a liquid container, a suction return line for said pump including a first portion extending into said liquid container and terminating in a discharge opening of reduced dimension from said suction line extending below the liquid level in said liquid container, and a second portion of said suction line having an inlet opening of larger dimension than said discharge opening and in line 'With but spaced in an axial direction away from said discharge opening in the direction of discharge flow and located in said liquid, whereby liquid returning through 4.- said suction line to said pump is directed at high velocity from said first portion of said suction line into the liquid of said container and into said suction line second portion, the turbulence causing gases to be separated therefrom and to rise in said liquid container.
6. A liquid degassing device according to claim 5 including vent means in said liquid container above the liquid level therein. 1 7
References Cited in the file of this patent UNITED STATES PATENTS 2,251,664 Davis Aug. 5, 1941 2,571,932 Olsson Oct. 16, 1951 2,668,598 Seed Feb. 9, 1954 2,753,011 Downs July 3, 1956 2,765,867 Revallier et a1. Oct. 9, 1956 FOREIGN PATENTS 869,041 Germany Mar. 2,
US637193A 1956-02-01 1957-01-30 Device for degassing pressure fluids of hydraulic power plants Expired - Lifetime US2962863A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031845A (en) * 1959-10-09 1962-05-01 Ling Temco Vought Inc Hydraulic system
US3193989A (en) * 1962-02-23 1965-07-13 Bruner Corp Aerating water treatment apparatus
US4300919A (en) * 1978-12-06 1981-11-17 Lucas Industries Limited Apparatus and method for desorption of gas from a liquid
US4398930A (en) * 1981-08-07 1983-08-16 Caterpillar Tractor Co. Fluid deaeration apparatus
US4652284A (en) * 1985-08-23 1987-03-24 American Sterilizer Company Anti-splash drain fixture
US5001901A (en) * 1988-10-04 1991-03-26 Sundstrand Corporation Hydraulic fluid circuit for full case hydraulic unit
EP0469416A1 (en) * 1990-07-30 1992-02-05 Deere & Company Tractor with hydraulically operated differential lock
US5275476A (en) * 1991-10-24 1994-01-04 Robert Bosch Gmbh Method for speeding up the braking intervention in the traction control mode, and hydraulic brake system for performing the method
US5727390A (en) * 1995-03-31 1998-03-17 Trinova Limited Re-circulating hydraulic system
US5943861A (en) * 1997-12-15 1999-08-31 General Motors Corporation Hydraulic system for motor vehicle
US5976226A (en) * 1997-12-18 1999-11-02 Bastian; Juergen Means to ensure a minimum of gas content in liquids used for heat exchange and insulating purposes with complementary means for liquid expansion into vessels with variable volumes
US8652233B2 (en) 2011-03-31 2014-02-18 The United States Of America, As Represented By The Administrator Of The U.S. Environmental Protection Agency On-board hydraulic fluid degasification system for a hydraulic hybrid vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2251664A (en) * 1936-06-20 1941-08-05 Francis W Davis Liquid circulating system
US2571932A (en) * 1946-03-16 1951-10-16 Olsson Bengt Apparatus for pumping viscou materials
DE869041C (en) * 1942-07-14 1953-03-02 Siemens Ag Process and device for degassing liquids
US2668598A (en) * 1949-11-21 1954-02-09 Ici Ltd Apparatus for removing gases from a liquid
US2753011A (en) * 1954-02-26 1956-07-03 United Aircraft Corp De-aerator and oil tank
US2765867A (en) * 1952-06-19 1956-10-09 Stamicarbon Method of separating dispersed gas from a liquid

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2251664A (en) * 1936-06-20 1941-08-05 Francis W Davis Liquid circulating system
DE869041C (en) * 1942-07-14 1953-03-02 Siemens Ag Process and device for degassing liquids
US2571932A (en) * 1946-03-16 1951-10-16 Olsson Bengt Apparatus for pumping viscou materials
US2668598A (en) * 1949-11-21 1954-02-09 Ici Ltd Apparatus for removing gases from a liquid
US2765867A (en) * 1952-06-19 1956-10-09 Stamicarbon Method of separating dispersed gas from a liquid
US2753011A (en) * 1954-02-26 1956-07-03 United Aircraft Corp De-aerator and oil tank

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031845A (en) * 1959-10-09 1962-05-01 Ling Temco Vought Inc Hydraulic system
US3193989A (en) * 1962-02-23 1965-07-13 Bruner Corp Aerating water treatment apparatus
US4300919A (en) * 1978-12-06 1981-11-17 Lucas Industries Limited Apparatus and method for desorption of gas from a liquid
US4398930A (en) * 1981-08-07 1983-08-16 Caterpillar Tractor Co. Fluid deaeration apparatus
US4652284A (en) * 1985-08-23 1987-03-24 American Sterilizer Company Anti-splash drain fixture
US5001901A (en) * 1988-10-04 1991-03-26 Sundstrand Corporation Hydraulic fluid circuit for full case hydraulic unit
EP0469416A1 (en) * 1990-07-30 1992-02-05 Deere & Company Tractor with hydraulically operated differential lock
EP0469417A1 (en) * 1990-07-30 1992-02-05 Deere & Company Hydraulic circuit for a vehicle
US5275476A (en) * 1991-10-24 1994-01-04 Robert Bosch Gmbh Method for speeding up the braking intervention in the traction control mode, and hydraulic brake system for performing the method
US5727390A (en) * 1995-03-31 1998-03-17 Trinova Limited Re-circulating hydraulic system
US5943861A (en) * 1997-12-15 1999-08-31 General Motors Corporation Hydraulic system for motor vehicle
US5976226A (en) * 1997-12-18 1999-11-02 Bastian; Juergen Means to ensure a minimum of gas content in liquids used for heat exchange and insulating purposes with complementary means for liquid expansion into vessels with variable volumes
US8652233B2 (en) 2011-03-31 2014-02-18 The United States Of America, As Represented By The Administrator Of The U.S. Environmental Protection Agency On-board hydraulic fluid degasification system for a hydraulic hybrid vehicle

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