CN112855910A - Integrated cooling device for gear box lubricating oil of wind turbine generator and control method - Google Patents

Abstract

The invention discloses a wind turbine generator gearbox lubricating oil integrated heat dissipation device and a control method, the heat dissipation device comprises a heat exchanger with a lubricating oil heat exchange channel and a controller, wherein the heat exchanger is arranged in a box body with a closed periphery, the top end and the bottom end of the box body are provided with openings, an axial flow fan is arranged at the opening at the top end of the box body, the opening at the bottom end is used as an air inlet, the axial flow fan is electrically connected with the controller, a temperature sensor for detecting the oil temperature at the oil inlet of the lubricating oil heat exchange channel is arranged at the oil inlet of the lubricating oil heat exchange channel, the lubricating oil heat exchange channel is divided into at least two stages of temperature control adjusting areas, a temperature sensor for detecting the oil temperature at the area is arranged in part of the temperature control adjusting areas, and the tail end of part of the temperature control adjusting area is provided with a three-way valve, the three-way valve is externally connected with a branch pipe which is directly communicated with an oil outlet, and the controller is respectively and electrically connected with the temperature sensor and the three-way valve. The heat dissipation device is compact in structure and convenient to install; and can carry out multistage control, regulation as required, improved heat exchange efficiency.

Description

Integrated cooling device for gear box lubricating oil of wind turbine generator and control method

Technical Field

The invention belongs to the technical field of wind power generation equipment, and particularly relates to a lubricating oil integrated heat dissipation device for a gearbox of a wind turbine generator and a control method.

Background

With the increasing importance of the international society on the problems of guaranteeing energy safety, protecting ecological environment, coping with climate change and the like, renewable energy has become the focus of the development of the global energy industry. According to the method, many countries develop policies and regulations for developing renewable energy sources, domestic energy source structures are promoted to be transformed to clean low carbon, positive effects are achieved, and wind power generation plays a significant role in the power industry of China.

One reason for the high failure rate of the wind turbine is that the low working efficiency of the air-cooled radiator causes the oil temperature of the gear box to rise, the fan can only operate in a limited power mode, if the temperature still tends to rise, shutdown protection is caused when the shutdown temperature is reached, and the normal operation of a wind field is influenced because the fan operates in a shutdown mode. The reason that the working efficiency of the air-cooled radiator is low is mainly that the cabin is compact in design, limited in space and limited in construction conditions, high-power radiating equipment cannot be installed, and in addition, a large number of heating elements are arranged, so that the ambient temperature in the cabin is increased, the heat exchange efficiency is insufficient, and the like.

At present, a plurality of heat radiating devices for a gearbox of a wind turbine generator are available, but the following defects generally exist in the actual operation process:

1) the temperature control valve is affected by various factors and needs to be replaced frequently, so that inconvenience is brought;

2) the physical structure of the circulating water tank has defects, impurities are easy to deposit, the tank body is easy to leak water, the single air cooling or water cooling effect is not ideal, the structure is complex, and the replacement and maintenance cost is high;

3) the heat exchange efficiency can not achieve the expected effect during the heavy load operation;

4) the occupied space is large, and the utilization of the cabin space is not maximized.

Disclosure of Invention

The invention aims to provide a wind turbine generator gearbox lubricating oil integrated heat dissipation device and a control method, and aims to solve the problems that a heat dissipation device for a wind turbine generator gearbox in the prior art is not ideal in cooling effect, large in occupied space, low in heat exchange efficiency and high in maintenance cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a wind turbine generator system gear box lubricating oil integral type heat abstractor, its includes heat exchanger and controller, the heat exchanger has lubricating oil heat transfer passageway, the heat exchanger sets up in a inclosed box all around, and the top and the bottom opening of box are installed axial fan to the top opening department of box, and the bottom opening is as the air intake, axial fan is connected with the controller electricity, lubricating oil heat transfer passageway's one end is as the oil inlet, and the other end is as the oil-out, oil inlet and oil-out all stretch out outside the box to by-pass the heat abstractor on wind turbine generator system gear box lubricating oil circulation pipeline, oil inlet department is provided with the temperature sensor who is used for detecting this oil temperature, lubricating oil heat transfer passageway is divided into from oil inlet to oil-out and is included two-stage at least control by temperature regulation regions, and other temperature control by temperature regulation regions at different levels The three-way valve is externally connected with a branch pipe which is communicated with the oil outlet, the controller is respectively electrically connected with the temperature sensor at the oil inlet, the temperature sensors of other temperature control adjusting areas at all levels and the three-way valve, the temperature sensor at the oil inlet sends a temperature signal to the controller, the controller compares the temperature signal with a set temperature and then controls the rotating speed of the axial flow fan, the temperature sensors of other temperature control adjusting areas at all levels send the temperature signal to the controller, and the controller compares the temperature signal with the set temperature and then controls the three-way valve to be opened and closed, so that lubricating oil flows into the next temperature control adjusting area or flows out of the oil outlet through the branch pipe.

As a further improvement of the scheme, the heat exchanger adopts a tubular heat exchanger which comprises a plurality of layers of heat exchange tubes arranged at intervals along the height direction, and each layer of heat exchange tube comprises a group of coiled tubes.

As a further improvement of the scheme, the heat exchange tube is of a double-layer sleeve structure, an inner tube of the heat exchange tube is used as a lubricating oil heat exchange channel, and heat exchange media are filled between an outer tube and the inner tube.

As a further improvement of the scheme, the outer pipe of the double-layer sleeve structure is closed.

As a further improvement of the scheme, the oil inlet is positioned above the oil outlet.

As a further improvement of the scheme, the filter screen is installed at the air inlet, and the low heat dissipation efficiency caused by dust deposition of the heat exchanger is avoided.

As a further improvement of the scheme, the axial flow fan is vertically aligned with the heat exchanger, so that forced airflow of the axial flow fan can be efficiently utilized, and the heat dissipation efficiency is improved.

As a further improvement of the scheme, the temperature sensors and the three-way valves arranged in the other temperature control adjusting areas at all levels are arranged on the longitudinal transition section between the upper-layer heat exchange tube and the lower-layer heat exchange tube.

The control method of any wind turbine generator gearbox lubricating oil integrated heat dissipation device comprises the following processes: when lubricating oil in the gear box passes through an oil inlet of the heat exchanger, the temperature sensor detects the oil temperature, when the oil temperature is less than a temperature T1 set by the controller, the controller controls the axial flow fan to rotate at a low speed, when the oil temperature is greater than or equal to a temperature T1 set by the controller and less than a temperature T2 set by the controller, the controller controls the axial flow fan to rotate at a medium speed, and when the oil temperature is greater than or equal to a temperature T2 set by the controller, the controller controls the axial flow fan to rotate at a high speed;

when lubricating oil flows through the first-stage temperature control adjusting area, the temperature sensor of the first-stage temperature control adjusting area detects the oil temperature in the area, when the oil temperature is less than the temperature T3 set by the controller and T3 is less than T1, the controller controls the opening and closing of the three-way valve at the tail end of the area, the lubricating oil flows out of the oil outlet through the branch pipe after passing through the three-way valve at the tail end of the area, otherwise, the lubricating oil flows into the next-stage temperature control adjusting area, and the like until the lubricating oil flows out of the oil outlet through the branch pipe or flows out of the oil outlet at the bottom of the heat exchanger after passing through the.

In a further improvement of the present invention, the temperature T1-45 ℃, T2-60 ℃, T3-30 DEG C

Compared with the prior art, the integrated heat dissipation device for the gear box lubricating oil of the wind turbine generator has the following advantages:

1) the three-way valve and the temperature control device are separately arranged, and the actual oil temperature is obtained through a program calculation mode, so that the triggering condition of temperature control is improved, and the service life of the valve body is prolonged;

2) the sleeve type integrated cold discharge (oil in the inner pipe and water in the outer pipe) is distributed in a snake shape, the design of adding circulating water into an original water tank is cancelled, the heat dissipation area is increased, an air cooling gap is reserved, water leakage and deposition are avoided from the design structure, and the heat exchange efficiency is greatly improved through water cooling and air cooling combined heat dissipation;

3) the axial flow fan is arranged at the top of the box body, so that the periphery of the device can be effectively sealed, a filter screen can be additionally arranged at an air inlet at the bottom of the box body, the low heat dissipation efficiency of the heat exchanger caused by dust deposition is avoided, and the heat in the heat dissipation device and a part of cabin environment can be directly discharged from an air inlet at the top of the cabin through the upper air outlet;

4) the grading operation is realized on the basis of the comprehensive regulation and control of the load and the oil temperature (the temperature control system is operated in advance according to the ultra-short forecast of the wind power in the heavy load on the windy day), and the heat exchange rate is comprehensively improved;

5) compact structure, occupation space are little, can furthest utilize the space in the cabin, and hoist and mount, transportation and installation are more convenient.

Drawings

Fig. 1 is a schematic perspective view of a transparent treated lubricating oil integrated heat dissipation device for a wind turbine generator gearbox according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a heat exchanger of a lubricating oil integrated heat dissipation device for a gearbox of a wind turbine generator according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a heat exchange tube of a lubricating oil integrated heat dissipation device of a wind turbine generator gearbox, provided by an embodiment of the invention;

fig. 4 is a flowchart of a control method of a lubricating oil integrated heat dissipation device for a gearbox of a wind turbine generator according to an embodiment of the present invention.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, in this embodiment, an integrated heat dissipation device for a gearbox lubricating oil of a wind turbine generator includes a box 1, a heat exchanger 2 and a control circuit board 3, the periphery of the box 1 is sealed, the top end and the bottom end of the box are open, the heat exchanger 2 is installed in the box 1, an axial fan 4 is installed at the top end of the box 1, the bottom end of the box 1 is opened as an air inlet, a filter screen 5 is installed at the air inlet, the axial fan 4 is vertically aligned with the heat exchanger 2, the control circuit board 3 is installed on the inner walls of two sides of the box 1, the control circuit board 3 is electrically connected with the axial fan 4, the control circuit board 3 controls the axial fan 4 to be opened, cooling air is sucked from the air inlet of the box 1, is discharged from the.

The heat exchanger 2 is provided with a lubricating oil heat exchange channel, one end of the lubricating oil heat exchange channel is used as an oil inlet 6, the other end of the lubricating oil heat exchange channel is used as an oil outlet 7, the oil inlet 6 and the oil outlet 7 both extend out of the box body 1, so that the heat dissipation device is connected on a lubricating oil circulation pipeline of the gear box of the wind generating set, the oil inlet 6 is positioned above the oil outlet 7, and the lubricating oil heat exchange channel is divided into three stages of temperature control adjusting areas from the oil inlet 6 to the oil outlet 7, a temperature sensor 8 for detecting the oil temperature at the oil inlet 6 is arranged at the oil inlet, the temperature sensor 8 for detecting the oil temperature at the area is arranged at each of the first stage temperature control adjusting area and the second stage temperature control adjusting area, and the tail ends of the first-stage temperature control adjusting area and the second-stage temperature control adjusting area are both provided with a three-way valve 9, the three-way valve 9 is externally connected with a branch pipe 10 which is directly communicated with the oil outlet 7, and the control circuit board 3 is respectively and electrically connected with each temperature sensor 8 and the three-way valve 9.

In this embodiment, the heat exchanger 2 is a tubular heat exchanger, which includes a plurality of layers of heat exchange tubes arranged at intervals along the height direction, and each layer of heat exchange tube includes a set of serpentine tubes, so that sufficient space is left between the heat exchange tubes, which is beneficial to air cooling and improves the heat exchange area. In order to improve the heat exchange efficiency, the heat exchange tube adopts a double-layer sleeve structure, the inner tube 11 of the heat exchange tube is used as a lubricating oil heat exchange channel to be filled with lubricating oil, a heat exchange medium is filled between the outer tube 12 and the inner tube 11, and the heat exchange medium can select any one of water or heat conduction oil as required. To minimize maintenance, it is preferred that the outer tube 12 be closed. Optionally, the outer tube 12 is externally connected with a heat exchange medium circulation system. The temperature sensor 8 and the three-way valve 9 in the first-stage temperature control adjusting area and the second-stage temperature control adjusting area are both arranged on the longitudinal transition section between the upper-layer heat exchange tube and the lower-layer heat exchange tube, so that the assembly and the maintenance are facilitated.

When the temperature control device works, the temperature sensor 8 at the oil inlet 6 sends a temperature signal to the control circuit board 3, the control circuit board 3 controls the rotating speed of the axial flow fan 4 after comparing the temperature signal with a set temperature, the temperature sensor 8 in the temperature control adjusting area sends the temperature signal to the control circuit board 3, the control circuit board 3 controls the action (namely opening and closing switching) of the three-way valve 9 after comparing the temperature signal with the set temperature, and then lubricating oil flows into the next-stage temperature control adjusting area or flows out of the oil outlet 7 through the branch pipe 10.

Referring to fig. 4, fig. 4 is a flowchart of a control method of a lubricating oil integrated heat dissipation device for a gearbox of a wind turbine generator according to an embodiment of the present invention.

The specific control method of the integrated lubricating oil heat dissipation device for the gearbox of the wind turbine generator comprises the following steps:

when lubricating oil in the gear box passes through an oil inlet 6 of the heat exchanger 2, a temperature sensor 8 at the position detects the oil temperature, when the oil temperature is less than 45 ℃, the axial flow fan rotates at a low speed (n is less than or equal to 600r/min) to save energy, when the oil temperature is less than 45 ℃, the axial flow fan rotates at a medium speed (1500r/min is less than or equal to 2000r/min), and when the oil temperature is less than or equal to 60 ℃, the axial flow fan rotates at a high speed (n is more than or equal to 2000 r/min);

when lubricating oil flows through a first-stage temperature control adjusting area, a temperature sensor 8 of the first-stage temperature control adjusting area detects the oil temperature of the area, if the oil temperature is less than 30 ℃, a three-way valve 9 at the tail end of the area acts to separate an oil outlet of the first-stage temperature control adjusting area from an oil inlet of a second-stage temperature control adjusting area, meanwhile, the tail end of the first-stage temperature control adjusting area is communicated with a branch pipe 10, the lubricating oil flows out of an oil outlet 7 through the branch pipe 10 after passing through the three-way valve 9 at the tail end of the area, if the oil temperature is greater than or equal to 30 ℃, the oil outlet of the first-stage temperature control adjusting area is communicated with the oil inlet of the second-stage temperature control adjusting area, meanwhile, the tail end of the first-;

when lubricating oil flows through the second-stage temperature control adjusting area, the temperature sensor 8 of the second-stage temperature control adjusting area detects the oil temperature of the area, if the oil temperature is less than 30 ℃, the three-way valve 9 at the tail end of the area acts to separate an oil outlet of the second-stage temperature control adjusting area from an oil inlet of the third-stage temperature control adjusting area, meanwhile, the tail end of the second-stage temperature control adjusting area is communicated with the branch pipe 10, the lubricating oil flows out of the oil outlet 7 through the branch pipe 10 after passing through the three-way valve 9 at the tail end of the area, if the oil temperature is not less than 30 ℃, the oil outlet of the second-stage temperature control adjusting area is communicated with the oil inlet of the third-stage temperature control adjusting area, meanwhile, the tail end of the second-stage temperature control adjusting area is separated from the branch.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. The utility model provides a wind turbine generator system gear box lubricating oil integral type heat abstractor, its includes heat exchanger and controller, the heat exchanger has lubricating oil heat transfer passageway, its characterized in that, the heat exchanger sets up in an inclosed box all around, and the top and the bottom opening of box are installed axial fan, and the bottom opening is as the air intake, axial fan is connected with the controller electricity, lubricating oil heat transfer passageway's one end is as the oil inlet, and the other end is as the oil-out, oil inlet and oil-out all stretch out outside the box to with heat abstractor side-by-side connection on wind turbine generator system gear box lubricating oil circulation pipeline, oil inlet department is provided with the temperature sensor who is used for detecting this department's oil temperature, lubricating oil heat transfer passageway is divided into including at least two-stage control by temperature change regulation region from oil inlet to oil-out, and other control by temperature change regions The three-way valve is connected with a branch pipe which is directly communicated with the oil outlet, the controller is respectively electrically connected with the temperature sensor at the oil inlet, the temperature sensors of the other temperature control adjusting areas at all levels and the three-way valve, the temperature sensor at the oil inlet sends a temperature signal to the controller, the controller compares the temperature signal with a set temperature and then controls the rotating speed of the axial flow fan, the temperature sensors of the other temperature control adjusting areas at all levels send the temperature signal to the controller, and the controller compares the temperature signal with the set temperature and then controls the opening and closing of the three-way valve, so that the lubricating oil flows into the next temperature control adjusting area or flows out of the oil outlet through the branch pipe.

2. The integrated heat dissipation device for gearbox lubricating oil of wind turbine generator set according to claim 1, wherein the heat exchanger is a tubular heat exchanger and comprises a plurality of layers of heat exchange tubes arranged at intervals in the height direction, and each layer of heat exchange tubes comprises a group of coiled tubes.

3. The integrated cooling device for the gear box and the lubricating oil of the wind turbine generator according to claim 2, wherein the heat exchange tube is of a double-layer sleeve structure, an inner tube of the heat exchange tube is used as a lubricating oil heat exchange channel, and a heat exchange medium is filled between the outer tube and the inner tube.

4. The integrated cooling device for lubricating oil of the gearbox of the wind turbine generator set according to claim 3, wherein the outer pipe of the double-layer sleeve structure is closed.

5. The wind turbine generator gearbox lubricating oil integrated heat dissipation device as recited in claim 1, wherein the oil inlet is located above the oil outlet.

6. The integrated heat dissipation device for gearbox lubricating oil of wind turbine generator system according to claim 1, wherein a filter screen is installed at the air inlet.

7. The wind turbine gearbox lubricating oil integrated heat sink as recited in claim 1, wherein said axial fan is vertically aligned with said heat exchanger.

8. The integrated heat dissipation device for the gearbox lubricating oil of the wind turbine generator set according to claim 2, wherein the temperature sensors and the three-way valves arranged in the other temperature control and regulation areas at all levels are arranged on a longitudinal transition section between the upper-layer heat exchange tube and the lower-layer heat exchange tube.

9. The control method of the wind turbine generator gearbox lubricating oil integrated heat dissipation device according to any one of claims 1-8, characterized by comprising the following processes: when lubricating oil in the gear box passes through an oil inlet of the heat exchanger, the temperature sensor detects the oil temperature, when the oil temperature is less than a temperature T1 set by the controller, the controller controls the axial flow fan to rotate at a low speed, when the oil temperature is greater than or equal to a temperature T1 set by the controller and less than a temperature T2 set by the controller, the controller controls the axial flow fan to rotate at a medium speed, and when the oil temperature is greater than or equal to a temperature T2 set by the controller, the controller controls the axial flow fan to rotate at a high speed;

when lubricating oil flows through the first-stage temperature control adjusting area, the temperature sensor of the first-stage temperature control adjusting area detects the oil temperature in the area, when the oil temperature is less than the temperature T3 set by the controller and T3 is less than T1, the controller controls the opening and closing of the three-way valve at the tail end of the area, the lubricating oil flows out of the oil outlet through the branch pipe after passing through the three-way valve at the tail end of the area, otherwise, the lubricating oil flows into the next-stage temperature control adjusting area, and the like until the lubricating oil flows out of the oil outlet through the branch pipe or flows out of the oil outlet at the bottom of the heat exchanger after passing through the.

10. The control method of the integrated heat sink for gearbox lubricating oil of wind turbine generator set according to claim 9, wherein the temperature T1 is 45 ℃, the temperature T2 is 60 ℃, and the temperature T3 is 30 ℃.

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