CN111237269A - Hydraulic heat dissipation system, marine riser suspension device hydraulic system and heat dissipation method - Google Patents
Hydraulic heat dissipation system, marine riser suspension device hydraulic system and heat dissipation method Download PDFInfo
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- CN111237269A CN111237269A CN202010063304.8A CN202010063304A CN111237269A CN 111237269 A CN111237269 A CN 111237269A CN 202010063304 A CN202010063304 A CN 202010063304A CN 111237269 A CN111237269 A CN 111237269A
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/17—Characterised by the construction of the motor unit of the straight-cylinder type of differential-piston type
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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
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
Abstract
The invention relates to a hydraulic heat dissipation system, a riser suspension device hydraulic system and a heat dissipation method. The hydraulic heat dissipation system comprises a high-pressure loop and a low-pressure loop, the high-pressure loop and the low-pressure loop are respectively connected with the differential hydraulic cylinder, the high-pressure loop comprises a high-pressure energy accumulator, a throttle valve block, a high-pressure overflow valve and a first one-way valve, the first one-way valve is connected with a rod cavity of the differential hydraulic cylinder and is connected with the throttle valve block and a rodless cavity of the differential hydraulic cylinder, and the other end of the throttle valve block is connected with the high-pressure energy accumulator and the high-pressure overflow valve; the low-pressure loop comprises a low-pressure energy accumulator, a cooler, a hydraulic pump and a second one-way valve, the second one-way valve is connected with a rod cavity of the differential hydraulic cylinder and is connected with the low-pressure energy accumulator and the cooler, the cooler is connected with the hydraulic pump, and the hydraulic pump is connected with the high-pressure overflow valve. The invention enables the cooling hydraulic oil of the low-pressure loop to enter the hydraulic cylinder and be mixed with the high-temperature hydraulic oil of the high-pressure loop, thereby reducing the temperature of the hydraulic oil of the high-pressure loop.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a hydraulic heat dissipation system, a hydraulic system of a marine riser suspension device and a heat dissipation method.
Background
The offshore floating drilling platform sometimes cannot stay in place when encountering extreme weather such as typhoons. If the typhoon path can be predicted accurately in advance, the riser is typically disconnected from the LMRP (lower riser assembly) and the upper deck is recovered, and the rig is then driven to a safe area. The whole marine riser is recovered and is reconnected and placed after typhoon in the ultra-deep sea area, which consumes several days of operation time. And meanwhile, the recovery or lowering operation must be carried out under better environmental conditions. In order to reduce the downtime and the operational risk in harsh environments, it is currently common practice to suspend all or part of the riser on the drilling platform and evacuate it with it, with good economic and safety benefits.
The current general riser suspension mode comprises a hard suspension mode and a soft suspension mode: the hard suspension is that the riser string is directly hung on a riser chuck, and the riser string is rigidly connected with the drilling platform; the soft suspension is to suspend the riser on a riser tensioner, and the riser string is flexibly connected with the platform (the riser tensioner can be regarded as an air spring). Both of these suspension methods have certain problems in field application: when the hard suspension is adopted, the riser string is rigidly connected with the platform, the motion acceleration of the platform is directly transmitted to the riser string, the riser is possibly dynamically compressed to cause buckling instability of the riser, and the tension at the top end of the riser is further larger than the wet weight of the riser (representing the weight of the riser with the buoyancy block in water, namely the dry weight minus the buoyancy), so that the riser is broken and falls into the sea; when the soft suspension is adopted, although the dynamic load of the marine riser caused by the heave motion of the platform is obviously reduced, the suspension safety of the marine riser is improved, the operation difficulty of taking the marine riser and connecting the marine riser back on site is very high, and if a plurality of marine risers are not taken out, the marine riser string has the risk of bottom contact.
In order to avoid the risks, a riser suspension device is developed, the dynamic load of a riser string caused by the heave motion of a platform can be reduced under the action of the limited stroke of a hydraulic cylinder through a throttling and active control method, and the riser is convenient to take on site. However, the riser suspension device adopts a throttling and active control method (specifically, the pressure of the hydraulic system is controlled by the throttle valve, and the active control means that the opening and closing of the throttle valve and the opening degree of the throttle valve are controlled by the control system), energy is input into the hydraulic system by the platform heave motion, the input energy is converted into heating of hydraulic oil, and heat dissipation needs to be carried out through a heat dissipation system. If a high-pressure radiating system is adopted, the high-pressure radiating system is generally a tubular radiator, the size is large, the price is high, and the arrangement on site is impossible, so that the reasonable radiating system becomes the key for successful application of the marine riser suspension device on site.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for dissipating heat of a marine riser suspension device by using hydraulic circulation, and aims to ensure smooth operation of the system by cooling high-temperature hydraulic oil of a hydraulic system. In addition, by the mode, the heat dissipation system is in a low-pressure loop, a high-pressure tube type radiator can be avoided, and the system can be ensured to be arranged and applied on the platform.
The invention firstly provides a hydraulic radiating system, which comprises a high-pressure loop and a low-pressure loop, wherein the high-pressure loop and the low-pressure loop are respectively connected with a differential hydraulic cylinder,
the high-pressure loop comprises a high-pressure energy accumulator, a throttle valve block, a high-pressure overflow valve and a first check valve, wherein the inflow end of the first check valve is connected with a rod cavity of the differential hydraulic cylinder, the outflow end of the first check valve is connected with the throttle valve block and a rodless cavity of the differential hydraulic cylinder, and the other end of the throttle valve block is connected with the high-pressure energy accumulator and the high-pressure overflow valve;
the low-pressure loop comprises a low-pressure accumulator, a cooler, a hydraulic pump and a second one-way valve, wherein the outflow end of the second one-way valve is connected with the rod cavity of the differential hydraulic cylinder, the inflow end of the second one-way valve is connected with the low-pressure accumulator and the cooler, the cooler is connected with the hydraulic pump, and the hydraulic pump is connected with the high-pressure overflow valve.
According to an embodiment of the present invention, the low-pressure loop further includes a low-pressure overflow valve and an oil tank, the oil tank is connected to the high-pressure overflow valve, the hydraulic pump and the low-pressure overflow valve, and the low-pressure overflow valve is connected to the low-pressure accumulator and the second check valve.
According to an embodiment of the present invention, the oil tank is connected in series with the low-pressure relief valve, the hydraulic pump and the cooler are connected in series, and a line connecting the oil tank with the low-pressure relief valve is connected in parallel with a line connecting the hydraulic pump and the cooler.
According to an embodiment of the present invention, the high pressure circuit further includes a shut-off valve, one end of the shut-off valve is connected to the throttle valve block, and the other end of the shut-off valve is connected to both the first check valve and the rodless chamber.
According to an embodiment of the present invention, the hydraulic heat dissipation system further includes a pressure sensor, and the pressure sensor is disposed on a pipeline connected to the rod-less chamber.
According to an embodiment of the present invention, the hydraulic heat dissipation system further includes a control unit, and the control unit is respectively connected to the pressure sensor, the throttle block, the high-pressure overflow valve, and the low-pressure overflow valve.
The invention also provides a hydraulic system of the marine riser suspension device, which comprises a differential hydraulic cylinder and the hydraulic heat dissipation system, wherein the differential hydraulic cylinder comprises an outer cylinder and an inner cylinder, the differential hydraulic cylinder is of a hollow structure, the hollow structure is suitable for mounting a suspension short section, the upper end of the suspension short section is connected with a piston rod of the differential hydraulic cylinder, and the lower end of the suspension short section penetrates through the differential hydraulic cylinder to be connected with the marine riser.
The invention also provides a hydraulic heat dissipation method, which comprises the following steps:
connecting a rod cavity of the differential hydraulic cylinder with a low-pressure loop through a second one-way valve, wherein hydraulic oil of the low-pressure loop enters the rod cavity of the differential hydraulic cylinder through the second one-way valve, and the hydraulic oil of the low-pressure loop is cooling hydraulic oil;
when hydraulic oil of the high-pressure loop enters the differential hydraulic cylinder, a rod cavity and a rodless cavity of the differential hydraulic cylinder are communicated through a first one-way valve; thereby mixing the hydraulic oil in the rod and rodless chambers of the differential cylinder.
According to one embodiment of the invention, the hydraulic oil of the rod chamber and the rodless chamber is mixed when the differential hydraulic cylinder moves upwards, and low-pressure hydraulic oil enters the differential hydraulic cylinder when the differential hydraulic cylinder moves downwards.
According to one embodiment of the present invention, when the piston of the differential hydraulic cylinder reciprocates, in the first half cycle of the cycle, a part of the hydraulic oil is made to enter the low-pressure circuit from the relief valve of the high-pressure circuit, and a part of the hydraulic oil of the low-pressure circuit is made to enter the rod chamber of the differential hydraulic cylinder; and isolating the low-pressure loop and the high-pressure loop in the lower half period of circulation, so that the hydraulic oil circulates in the high-pressure loop. The hydraulic pump and cooler are operated throughout the cycle, thereby lowering the temperature of the hydraulic oil in the low pressure circuit.
According to the differential hydraulic cylinder and the semi-open type circulating heat dissipation system, a part of high-temperature and high-pressure oil (generated when the hydraulic cylinder absorbs energy) in a hydraulic system is replaced by the differential hydraulic cylinder and enters a low-pressure system, and the high-temperature oil can be fully cooled by the low-pressure plate type heat dissipater, so that the long-time work of the system can be guaranteed. The differential hydraulic cylinder semi-open type circulating heat dissipation method adopted by the invention can avoid the configuration of a high-pressure radiator in a high-pressure hydraulic system, but can solve the heat dissipation problem of the whole hydraulic system by configuring a conventional plate type radiator in a low-pressure system, thereby greatly reducing the volume and the cost of the radiator and having good heat dissipation effect.
Drawings
FIG. 1 is a flow chart of a system for suspending a riser shelter according to an embodiment of the present invention;
fig. 2 is a heating power curve of a heat dissipation system of a riser suspension device according to an embodiment of the present invention;
FIG. 3 is a pressure curve of a rodless cavity of a riser mount avoiding suspension device according to an embodiment of the present invention;
FIG. 4a is a schematic cross-sectional view of a connection between a hydraulic cylinder and a suspension sub according to an embodiment of the present invention;
FIG. 4b is a cross-sectional view of a hydraulic cylinder according to an embodiment of the present invention;
reference numerals:
1. the hydraulic system comprises a differential hydraulic cylinder, 101, an outer cylinder, 102, a piston, 103, an inner cylinder, 104, a piston rod, 105, a cylinder flange, 2, a suspension nipple, 201, a nipple flange, 3.1, a second check valve, 3.2, a first check valve, 4, a shut-off valve, 5, a pressure sensor, 6, a throttle valve block, 7, a high-pressure accumulator, 8, a high-pressure overflow valve, 9, an oil tank, 10, a hydraulic pump, 11, a low-pressure overflow valve, 12, a cooler, 13, a low-pressure accumulator and 14, and a control unit.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1, the present invention firstly provides a hydraulic heat dissipation system, which is used for dissipating heat generated by hydraulic oil in a hydraulic cylinder in time. The hydraulic heat dissipation system mainly comprises a high-pressure loop and a low-pressure loop, and the high-pressure loop and the low-pressure loop are respectively connected with the differential hydraulic cylinder.
The high-pressure loop mainly comprises a high-pressure energy accumulator 7, a throttle valve block 6, a high-pressure overflow valve 8 and a first one-way valve 3.2, wherein the inflow end of the first one-way valve 3.2 is connected with a rod cavity of the differential hydraulic cylinder 1, the outflow end of the first one-way valve 3.2 is connected with the throttle valve block 6 and a rodless cavity of the differential hydraulic cylinder, and the other end of the throttle valve block 6 is connected with the high-pressure energy accumulator 7 and the high-pressure overflow valve 8.
The low-pressure loop mainly comprises a low-pressure accumulator 13, a cooler 12, a hydraulic pump 10 and a second check valve 3.1, wherein the outflow end of the second check valve 3.1 is connected with a rod cavity of the differential hydraulic cylinder 1, the inflow end of the second check valve 3.1 is connected with the low-pressure accumulator 13 and the cooler 12, the cooler 12 is connected with the hydraulic pump 10, and the hydraulic pump 10 is connected with the high-pressure overflow valve 8.
The throttle valve block 6 may consist of one throttle valve and four check valves as shown in fig. 1. The differential cylinder 1 may be a U-shaped differential cylinder.
The rodless chamber is connected to the rod chamber via a first one-way valve 3.2.
According to an embodiment of the present invention, the low-pressure circuit further includes a low-pressure relief valve 11 and an oil tank 9, the oil tank 9 is connected to the high-pressure relief valve 8, the hydraulic pump 10 and the low-pressure relief valve 11, and the low-pressure relief valve 11 is connected to the low-pressure accumulator 13 and the second check valve 3.1.
According to an embodiment of the present invention, the oil tank 9 is connected in series to the low-pressure relief valve 11, the hydraulic pump 10 and the cooler 12 are connected in series, and a line connecting the oil tank 9 and the low-pressure relief valve 11 is connected in parallel to a line connecting the hydraulic pump 10 and the cooler 12.
According to one embodiment of the present invention, the high pressure circuit further includes a shut-off valve 4, one end of the shut-off valve 4 is connected to the throttle valve block 6, and the other end of the shut-off valve 4 is connected to both the first check valve 3.2 and the rodless cavity.
A port P (main oil inlet) of the shut-off valve 4 is connected with a rodless cavity of the differential hydraulic cylinder 1, and a port A (working oil port) is connected with a port P (main oil inlet) of the throttle valve block 6.
According to an embodiment of the present invention, the hydraulic heat dissipation system further comprises a pressure sensor 5, which is disposed on a pipeline connected to the rodless cavity.
The port A (working oil port) of the throttle valve block 6 is connected with a high-pressure energy accumulator 7 and is also connected with the port P (main oil inlet) of a high-pressure overflow valve 8. The high-pressure accumulator is a piston accumulator, and the rear end of the high-pressure accumulator is connected with a high-pressure air bottle. The port A of the high-pressure overflow valve 8 is connected with an oil tank 9. The hydraulic pump 10 is connected to a low-pressure accumulator 13 via a cooler 12. The low-pressure accumulator 13 is connected to the chamber of the differential hydraulic cylinder 1 via a second non-return valve 3.1. The A port (working oil port) of the low-pressure overflow valve 11 is connected with the outlet of the cooler 12, and the P port (main oil inlet) is connected with the oil tank 9.
The high pressure air bottle connected to the rear end of the high pressure accumulator 7 is bulky and therefore it can be considered that the pressure of the high pressure accumulator remains substantially constant during operation of the riser suspension.
The low pressure accumulator serves to keep the pressure substantially constant and to replenish the oil when there is a leak in the system.
According to an embodiment of the present invention, the hydraulic heat dissipation system further includes a control unit 14, and the control unit 14 is connected to the pressure sensor 5, the throttle block 6, the high-pressure overflow valve 8, and the low-pressure overflow valve 11, respectively.
The control unit 14 adjusts the pressure of the high-pressure overflow valve 8 and the low-pressure overflow valve 11 according to the measured pressure and different working conditions, and simultaneously adjusts the opening size of the throttle valve block 6 to keep the pressure of the rodless cavity of the differential hydraulic cylinder 1 at a set pressure value when the pressure of the rodless cavity of the differential hydraulic cylinder 1 exceeds a limit value.
A rod cavity of a differential hydraulic cylinder 1 is connected with a first check valve 3.2 and a second check valve 3.1, the rod cavity and a rodless cavity of the differential hydraulic cylinder 1 are connected through a first check valve 3.2, the rod cavity of the differential hydraulic cylinder is connected with a low-pressure loop through a second check valve 3.1, hydraulic oil of the low-pressure loop can enter the rod cavity of the hydraulic cylinder through the second check valve 3.1, the rod cavity and the rodless cavity are communicated through the first check valve 3.2 when the hydraulic oil of the high-pressure loop enters the hydraulic cylinder, so that the hydraulic oil of the rod cavity and the rodless cavity is mixed when the hydraulic cylinder moves upwards, and the low-pressure hydraulic oil enters the hydraulic cylinder when the hydraulic cylinder moves downwards, thereby realizing semi-open circulation, namely in the upper half period of circulation, part of the hydraulic oil enters the low-pressure loop from an overflow valve of the high-pressure loop, and part of the hydraulic oil in the; in the lower half of the cycle, the low pressure circuit and the high pressure circuit are isolated and hydraulic oil circulates only in the high pressure circuit.
The working principle of the device is as follows:
as shown in fig. 2, the curve is a heating power curve of the riser suspension hydraulic system; as shown in fig. 3, the curve is the pressure curve of the rodless chamber when the hydraulic cylinder is operating.
The differential hydraulic cylinder 1 is one-way differential (differential only when the piston moves upwards, and non-differential when the piston moves downwards) because the rod chamber and the rodless chamber are connected through the one-way valve 3.2.
When the hydraulic cylinder moves downwards, high-pressure hydraulic oil in the hydraulic cylinder flows to a hydraulic system, the rodless cavity and the rod cavity of the differential hydraulic cylinder 1 are not communicated, the high-pressure hydraulic oil in the rodless cavity of the hydraulic cylinder enters the high-pressure energy accumulator 7 through the throttle valve block 6, after the high-pressure energy accumulator 7 is filled, the rest high-pressure hydraulic oil overflows into the oil tank 9 through the high-pressure overflow valve 8, and the temperature is increased because the high-pressure hydraulic oil passes through the throttle valve block 6. Hydraulic oil in the heat dissipation system (for cooling hydraulic oil) enters the rod cavity through the second check valve 3.1. In the descending period of the hydraulic cylinder, the hydraulic cylinder outputs energy to the hydraulic system, high-pressure hydraulic oil of the hydraulic cylinder generates heat when passing through the throttle valve, and the temperature of the hydraulic oil is increased.
When the hydraulic cylinder moves upwards, the hydraulic system inputs energy to the hydraulic cylinder, and high-pressure hydraulic oil in the high-pressure energy accumulator 7 enters the hydraulic cylinder through the throttle valve block 6. Because the pneumatic cylinder goes upward this moment, so check valve 3.1 closes, and check valve 3.2 opens, and the chamber that has of pneumatic cylinder has the pole chamber and does not have the pole chamber UNICOM, has the hydraulic oil mixture between the pole chamber and the no pole chamber. Because the hydraulic oil in the rod cavity is cooling hydraulic oil, the cooling hydraulic oil is mixed with the high-temperature hydraulic oil to cool the high-temperature hydraulic oil.
In this working period, the high-pressure hydraulic oil overflows into the oil tank 9, and the overflowing high-pressure hydraulic oil is high-temperature hydraulic oil. The hydraulic oil at the outlet of the heat dissipation system is always cooling hydraulic oil, i.e. the hydraulic oil is pumped into a cooler 12 from the oil tank 9 through a hydraulic pump 10. Of course, the overflow valve may be directly connected to the hydraulic pump.
The heat dissipation system is in a full-period working state, and when the piston moves upwards, the hydraulic pump cools oil in the oil tank through the cooler and supplies the cooled oil to the low-pressure energy accumulator; when the piston moves downwards and the high-pressure energy accumulator reaches the highest pressure, the high-pressure energy accumulator flows out of the overflow valve, extra high-temperature oil is discharged to the oil tank, and meanwhile cooling oil in the low-pressure energy accumulator enters a rod cavity of the differential hydraulic cylinder 1 through the one-way valve 3.1, so that primary system cooling oil change is completed.
The invention also provides a hydraulic system of the marine riser suspension device, which comprises a differential hydraulic cylinder 1 and the hydraulic heat dissipation system, as shown in fig. 4a and 4b, wherein the differential hydraulic cylinder 1 comprises an outer cylinder 101 and an inner cylinder 103, the differential hydraulic cylinder is of a hollow structure and can be regarded as a U-shaped structure, the hollow structure is suitable for mounting a suspension short section 2, the upper end of the suspension short section 2 is connected with a piston rod 104 of the differential hydraulic cylinder through a short section flange 201, and the lower end of the suspension short section passes through the differential hydraulic cylinder so as to be connected with a marine riser. In the figure, 102 is a piston, and 105 is a cylinder flange.
The invention also provides a hydraulic heat dissipation method, which comprises the following steps:
connecting a rod cavity of the differential hydraulic cylinder with a low-pressure loop through a second one-way valve, wherein hydraulic oil of the low-pressure loop enters the rod cavity of the differential hydraulic cylinder through the second one-way valve, and the hydraulic oil of the low-pressure loop is cooling hydraulic oil;
when hydraulic oil of the high-pressure loop enters the differential hydraulic cylinder, a rod cavity and a rodless cavity of the differential hydraulic cylinder are communicated through a first one-way valve; thereby mixing the hydraulic oil in the rod and rodless chambers of the differential cylinder.
According to one embodiment of the invention, the hydraulic oil of the rod chamber and the rodless chamber is mixed when the differential hydraulic cylinder moves upwards, and low-pressure hydraulic oil enters the differential hydraulic cylinder when the differential hydraulic cylinder moves downwards.
According to the differential hydraulic cylinder semi-open type circulating heat dissipation method, the cooling hydraulic oil of the low-pressure loop can enter the hydraulic cylinder and be mixed with the high-temperature hydraulic oil of the high-pressure loop through the differential hydraulic cylinder and the semi-open type circulating system, so that the temperature of the hydraulic oil of the high-pressure loop is reduced.
In one period of the up-and-down movement of the piston rod of the hydraulic cylinder, the hydraulic oil circulation can be divided into an upper half period and a lower half period.
According to one embodiment of the present invention, when the piston of the differential hydraulic cylinder reciprocates, in the first half cycle of the cycle, a part of the hydraulic oil is made to enter the low-pressure circuit from the relief valve of the high-pressure circuit, and a part of the hydraulic oil of the low-pressure circuit is made to enter the rod chamber of the differential hydraulic cylinder; and isolating the low-pressure loop and the high-pressure loop in the lower half period of circulation, so that the hydraulic oil circulates in the high-pressure loop. The hydraulic pump and cooler are operated throughout the cycle, thereby lowering the temperature of the hydraulic oil in the low pressure circuit.
In the semi-open type circulating system, a rod cavity and a rodless cavity of the differential hydraulic cylinder are connected through a one-way valve (the direction of the one-way valve is from the rod cavity to the rodless cavity), and a rod cavity of the differential hydraulic cylinder is connected with a low-pressure loop through the one-way valve (the direction of the one-way valve is from the low-pressure loop to the rod cavity); hydraulic oil of the low-pressure loop can enter a rod cavity of the hydraulic cylinder through the one-way valve, and the rod cavity is communicated with the rodless cavity through the one-way valve when the hydraulic oil of the high-pressure loop enters the hydraulic cylinder; when the hydraulic cylinder moves upwards, hydraulic oil in the rod cavity and the rodless cavity is mixed, and when the hydraulic cylinder moves downwards, low-pressure hydraulic oil enters the hydraulic cylinder.
The suspension device is used for suspending the marine riser under severe sea conditions, the acceleration of the marine riser moving along with the platform can be reduced through the suspension device, and the suspension device adopts a working method of active control and peak acceleration elimination only through compensation, so that in the heave movement period of the platform, when the downward acceleration of the platform is large, a hydraulic cylinder of the suspension device moves upwards, a hydraulic system outputs energy, and when the upward acceleration of the platform is large, the hydraulic cylinder of the suspension device moves downwards, and the hydraulic system absorbs energy. The hydraulic system can generate heat seriously because the energy output by the hydraulic system is less than the energy absorbed by the hydraulic system in the motion period of the platform.
The differential hydraulic cylinder, the semi-open type circulating heat dissipation system and the hydraulic control system work in a combined mode, a part of high-temperature and high-pressure oil (generated when the hydraulic cylinder absorbs energy) in the hydraulic system is replaced by the differential hydraulic cylinder to enter the low-pressure system, the high-temperature oil is fully cooled by the low-pressure plate type radiator, and long-time work of the system is guaranteed. The differential hydraulic cylinder semi-open type circulating heat dissipation method avoids the configuration of a high-pressure radiator in a high-pressure hydraulic system, but can solve the heat dissipation problem of the whole hydraulic system by configuring a conventional plate radiator in a low-pressure system, greatly reduces the volume and the cost of the radiator, and has good heat dissipation effect.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiments are merely illustrative of the present invention, and various components and devices of the embodiments may be changed or eliminated as desired, not all components shown in the drawings are necessarily required, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments described herein, and all equivalent changes and modifications based on the technical solutions of the present invention should not be excluded from the scope of the present invention.
Claims (10)
1. A hydraulic heat dissipation system is characterized by comprising a high-pressure loop and a low-pressure loop, wherein the high-pressure loop and the low-pressure loop are respectively connected with a differential hydraulic cylinder,
the high-pressure loop comprises a high-pressure energy accumulator, a throttle valve block, a high-pressure overflow valve and a first check valve, wherein the inflow end of the first check valve is connected with a rod cavity of the differential hydraulic cylinder, the outflow end of the first check valve is connected with the throttle valve block and a rodless cavity of the differential hydraulic cylinder, and the other end of the throttle valve block is connected with the high-pressure energy accumulator and the high-pressure overflow valve;
the low-pressure loop comprises a low-pressure accumulator, a cooler, a hydraulic pump and a second one-way valve, wherein the outflow end of the second one-way valve is connected with the rod cavity of the differential hydraulic cylinder, the inflow end of the second one-way valve is connected with the low-pressure accumulator and the cooler, the cooler is connected with the hydraulic pump, and the hydraulic pump is connected with the high-pressure overflow valve.
2. The hydraulic cooling system of claim 1, wherein the low-pressure circuit further comprises a low-pressure relief valve and an oil tank, the oil tank is connected to the high-pressure relief valve, the hydraulic pump and the low-pressure relief valve, and the low-pressure relief valve is connected to the low-pressure accumulator and the second check valve.
3. The hydraulic heat dissipation system according to claim 2, wherein the oil tank is connected in series with the low-pressure overflow valve, the hydraulic pump and the cooler are connected in series, and a line of the oil tank connected to the low-pressure overflow valve is connected in parallel with a line of the hydraulic pump connected to the cooler.
4. The hydraulic cooling system according to any one of claims 1 to 3, wherein the high-pressure circuit further comprises a shut-off valve, one end of the shut-off valve is connected to the throttle valve block, and the other end of the shut-off valve is connected to both the first check valve and the rodless cavity.
5. The hydraulic cooling system of any one of claims 1 to 3, further comprising a pressure sensor disposed on a line connected to the rodless cavity.
6. The hydraulic cooling system of claim 5, further comprising a control unit connected to the pressure sensor, the throttle block, the high pressure relief valve, and the low pressure relief valve, respectively.
7. A riser hanging device hydraulic system is characterized by comprising a differential hydraulic cylinder and the hydraulic heat dissipation system of any one of claims 1 to 6, wherein the differential hydraulic cylinder comprises an outer cylinder and an inner cylinder, the differential hydraulic cylinder is of a hollow structure, the hollow structure is suitable for installing a hanging short section, the upper end of the hanging short section is connected with a piston rod of the differential hydraulic cylinder, and the lower end of the hanging short section penetrates through the differential hydraulic cylinder to be connected with a riser.
8. A hydraulic heat dissipation method, comprising:
connecting a rod cavity of the differential hydraulic cylinder with a low-pressure loop through a second one-way valve, wherein hydraulic oil of the low-pressure loop enters the rod cavity of the differential hydraulic cylinder through the second one-way valve, and the hydraulic oil of the low-pressure loop is cooling hydraulic oil;
when hydraulic oil of the high-pressure loop enters the differential hydraulic cylinder, a rod cavity and a rodless cavity of the differential hydraulic cylinder are communicated through a first one-way valve; thereby mixing the hydraulic oil in the rod and rodless chambers of the differential cylinder.
9. The method of claim 8, wherein hydraulic oil from the rod and rodless chambers mixes when the differential cylinder is up and low pressure hydraulic oil enters the differential cylinder when the differential cylinder is down.
10. The method according to claim 9, wherein when the piston of the differential hydraulic cylinder reciprocates, a part of hydraulic oil is caused to enter the low-pressure circuit from the relief valve of the high-pressure circuit and a part of hydraulic oil of the low-pressure circuit is caused to enter the rod chamber of the differential hydraulic cylinder in an upper half of a cycle; isolating the low-pressure circuit and the high-pressure circuit in the lower half period of circulation, so that hydraulic oil circulates in the high-pressure circuit; the hydraulic pump and cooler are operated throughout the cycle, thereby lowering the temperature of the hydraulic oil in the low pressure circuit.
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| CN114105014A (en) * | 2021-10-28 | 2022-03-01 | 湖南三一中型起重机械有限公司 | Auxiliary boom amplitude-variable hydraulic system and operation machine |
| CN115163600A (en) * | 2022-09-07 | 2022-10-11 | 浙大城市学院 | Large-range nanoscale positioning system based on fluid control |
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| CN111237269B (en) | 2022-03-01 |
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